Construction method of SMW construction method (be specific)

Three-axis deep mixing pile construction plan

1. Project overview

1.1 Basic project overview The project consists of a 61-story building with a height of 229.5 meters and a total construction area of ????Approximately 160,000 square meters, including a tower, surrounding podiums and pure basements. The overall structure is equipped with a 4-story basement. The design adopts a plan of sequential construction of the tower and reverse construction of the surrounding podiums for foundation pit construction.

The design unit of this project is East China Architectural Design and Research Institute Co., Ltd.; the supervision unit is Shanghai Collaborative Engineering Supervision and Cost Consulting Co., Ltd.; the pile foundation and foundation pit enclosure construction unit is Zhejiang Geological and Mineral Engineering Company .

According to the drawing design and contract construction requirements, the construction content involved mainly includes pile foundation, underground diaphragm wall enclosure structure, tower bored pile temporary enclosure structure, double-pipe high-pressure jet grouting piles, and SMW Construction methods: cement-soil mixing piles and compaction grouting, etc. This construction organization design mainly prepares and organizes the construction of the above-mentioned processes.

The ±0.00m of this project is relative to the absolute elevation of 3.500m, and the average relative elevation of the site is -1.100m. Consider a 200mm thick C20 plain concrete cushion. The relative elevation of the bottom of the foundation cushion is -20.100m, -13.300 (podium area). The excavation depth of the foundation pit is 19m.

1.2 Overview of foundation pit enclosure engineering design

1.2.1 The underground diaphragm wall engineering enclosure structure adopts underground diaphragm walls. The total extension of the diaphragm walls is approximately 536m. ***93 pictures Walls are divided into five types: A, B, C, D, and E. The thickness of type A wall is 1.0m, and the thickness of other underground walls is 0.8m. The wall depth ranges from 33 to 35m, and a silt layer of ⑦1 is inserted into the underground wall site. The joint form of the underground diaphragm wall adopts a flexible joint. The design strength grade of the underground wall concrete is C30, the thickness of the main reinforcement protective layer is 70mm, and the anti-permeability grade is S8; the steel bars are HPB235, HRB335, and HRB400.

1.2.2 Bored cast-in-place pile rows are set up around the tower inside the foundation pit. Bored cast-in-place pile rows are combined with a single row of three-axis cement-soil mixing piles and a water-stop curtain is used as a temporary partition enclosure structure. The pile concrete design strength grade is C30. The tower is bored and cast-in-place piles, with a depth of about 34m (relative elevation of the pile bottom -35.10m) and 187 piles.

1.2.3 Triaxial cement-soil mixing piles Triaxial cement-soil mixing piles are used for the soil reinforcement in the passive area inside the foundation pit and the water-stop curtain on the temporary enclosure side. The triaxial cement-soil mixing pile uses P32.5 grade fresh ordinary Portland cement. The cement content below the base is 20, the water-cement ratio is 1.5~2.0, and the 28-day unconfined compressive strength of the pile is ≥1.0MPa. Triaxial The cement and soil mixing piles are constructed using Φ850 three-axis mixing pile equipment. The construction technology of two sprays and two stirrings is used. The water-stop curtain is constructed using the socket-one-hole method. The soil reinforcement overlaps each other by 250mm, which must be done within the scope of the pile body. Mix the cement evenly. The verticality deviation of the pile body shall not be greater than 1/150, and the deviation of the pile position shall not be greater than 20mm.

1.2.4 Compaction grouting is used to fill the gaps between the soil reinforcement and the enclosure structure in the passive zone, and between the pile rows and the water-stop curtain. The spacing between compaction grouting points in the former is 1000mm, and the spacing between compaction grouting points in the latter is the same as the spacing between rows of piles, which is 1300mm. Compaction grouting uses P32.5 grade fresh ordinary Portland cement. The injection rate of compaction grouting is 20 (ratio to the volume of the soil being reinforced). The water-cement ratio is 0.55, and the grouting sequence adopts jump hole interval grouting.

1.2.5 High-pressure jet grouting piles The diameter of high-pressure jet grouting piles is 1000 and the spacing is 700mm. The cement dosage is 550kg/m, and the water-cement ratio of the cement slurry is 0.8. Pressure control: The air pressure should not be less than 0.7MPa, and the cement slurry flow pressure should be greater than 25MPa.

2. Basis for compilation

2.1 Shanghai Standard "Code for Design of Foundation Foundation" (DGJ08-11-1999);

2.2 "Shaped Steel Cement Soil Stirring Wall" Technical Regulations" (DGJ08-116-2005);

2.3 "Code for Quality Acceptance of Building Foundation Construction" (GB50202-2002);

2.4 "Uniform Standard for Quality Acceptance of Construction Projects 》(GB50300-2001);

3. Construction scope

The foundation pit enclosure structure system: Ф850 three-axis cement and soil mixing pile water-stop curtain outside the pit, Ф850 three-axis cement and soil mixing pile inside the pit The shaft is reinforced with cement-soil mixing piles.

4. Construction deployment

4.1 The overall construction sequence takes into account the existing power supply and water supply conditions on site to achieve a reasonable allocation of resources. In order to ensure the construction quality of the foundation pit enclosure system of this project, the overall construction sequence of the foundation pit enclosure system is: first construct the Ф850 three-axis cement-soil mixing pile pit external water-stop curtain, and after 7 days of construction, start along the completed three-axis cement Bored cast-in-place piles are constructed on the inside of the soil mixing piles, and the construction of the water-stop curtain outside the pit of Ф850 three-axis cement-soil mixing piles is completed. The construction method is transferred to the pit, and the construction pit is reinforced. The three-axis cement-soil mixing piles are reinforced in the pit and are constructed cross-cutting with the bored cast-in-place piles. .

4.2 Site layout

4.3 Power supply and daily water supply The electricity consumption and daily water supply required by each set of equipment are as follows:

4.3.1 Power supply About: 300KW. .

The daily water supply on 4.3.2 is approximately: 180 cubic meters.

5. Construction progress plan

5.1 Overall construction progress plan This project considers 24-hour construction. The specific construction progress plan is detailed in the table below: Serial number Calendar day Task name Days (days)

1. Construction preparation 3

2. Ф850 three-axis cement-soil mixing pile water-stop curtain 20 outside the construction pit

3. Reinforcement Ф850 inside the construction pit of machine No. Three-axis cement-soil mixing pile 25

5.2 Measures to ensure the construction period

5.2.1 Measures to ensure the construction organization

(1) Equip an experienced and capable construction team and project leadership team to ensure well-equipped personnel and effective implementation of project management.

(2) The organizational mechanism ensures the progress of the project, ensures that the project achieves qualified goals, and has goals, measures, and certainty. You can rest assured, and the owner can rest assured that you can deliver a high-quality project to the owner.

(3) Complete this project according to the overall progress plan, and conduct process decomposition and implementation of sub-projects. Ensure the organization and implementation of construction personnel allocation, implementation of construction machinery, materials, and equipment according to the entry and exit plan, and implementation of phased construction progress and time.

5.2.2 Material supply assurance measures

(1) Select high-quality bulk cement for this project. During the construction period, communicate well with the cement supplier and require the cement supplier to Our company has made a commitment to ensure the supply of 200 tons of cement per day once construction starts to ensure the normal operation of the construction.

(2) During the construction period, ensure a continuous supply of bulk cement storage.

5.2.3 Guarantee measures for construction machinery, equipment and tools

(1) According to the characteristics of this project, appropriate construction machinery, equipment and tools must be equipped, and the machinery and equipment must be inspected in advance before being put into use. , Maintenance, ensuring that the equipment and machinery entering the construction site are running well to provide guarantee for the progress of the project.

(2) Increase the backup of mechanical equipment parts and grouting pumps. Once damaged, the backup equipment will be activated immediately to ensure the continuous progress of construction.

5.2.4 Technical assurance measures

(1) Organize engineering technical personnel to study and review drawings, and jointly participate in the preparation of engineering network progress plans to ensure that the technical solutions are reasonable and feasible , the network plan implementation is effective and reliable.

(2) Completely resolve the contradictions and problems during the construction process and effectively cooperate with each other in the construction process.

(3) Organize technical personnel to prepare and optimize the construction plan, deepen the operation design and technical processing measures of key nodes, and ensure the quality of the project and the smooth progress of the project.

(4) Fully consider various adverse factors and possible emergencies and formulate targeted measures. Achieve multiple guarantees such as prior control, process implementation, intermediate inspection, and process control to ensure the smooth implementation of the construction schedule.

6. Machinery and equipment to be put into construction

6.1 Main construction machinery and equipment table serial number equipment name specification model unit quantity total power (KW)

1 .Three-axis mixing drilling rig JB-160 units 1160×1

2. Three-axis mixing drilling rig ZKD85-3A unit 190×1

3. Pile driver DH-608 unit 1 diesel engine

4. Excavator 0.8m3 2 diesel engines

5. Bulk cement automatic slurry mixing system set 145×1

6. Grouting pump BW- 200 sets 215×2

7. Spare grouting pump BW-200 sets 2

8. Air compressor 6m3 set 145×1

9. Electric welding Machine BZ-500 type table 120×1

10. Iodine tungsten lamp cover 13.5×1

6.2 Measuring instruments and instruments used in construction Serial number Instrument and equipment name Specification Model Unit quantity 1 Steel tape measure 50-meter 12-meter theodolite J2-2 sets 13 levels DSZ 3 sets 14-line hammer 3 meters only 2 Note: All the above measuring instruments have been inspected by professional testing units before use to ensure that the effectiveness of the measuring instruments meets the standard requirements.

7. Three-axis deep mixing pile construction plan

Special situation handling measures

(1) When there is an abnormality, if the design depth cannot be reached for construction , should be reported to Party A and the supervisor in a timely manner, and remedial measures should be taken after study by all parties.

(2) When a ground ditch or underground pipeline cannot be constructed according to the designed direction, it is advisable to negotiate with the design unit, owner, and supervisor to determine a solution.

(3) During the construction process, if there is a power outage or special circumstances that cause the wall-forming process to be interrupted due to shutdown, the mixer should be lowered to 0.5m below the slurry stop point, and the mixer should be lowered until the slurry supply is restored. Drill and stir the grouting to prevent discontinuous walls; if the shutdown time is long for any reason, it is recommended to disassemble the grout pipeline and clean it properly to prevent the grout from hardening and blocking the pipe.

(4) If the pipeline is blocked, the pump should be stopped immediately. After the treatment is completed, immediately lift the mixing drill tool up and sink 1.0m before grouting can continue. Wait 10 to 20 seconds to resume upward lifting and stirring to prevent pile breakage.

(5) Cold joint treatment during construction. Once a cold joint occurs during the construction process, the solution is to add plain piles outside the retaining piles at the cold joint. After the retaining piles reach a certain strength, the piles will be replenished. Prevent offset drilling to ensure the effect of pile repair. The overlap thickness of plain piles and enclosing piles is about 10cm. The amount of work increased due to the treatment of cold joints is calculated separately from the actual construction amount.

Leaking water treatment During the entire foundation pit excavation stage, our company will organize a construction site team to stay at the construction site and prepare corresponding equipment and materials to closely monitor the foundation pit excavation. Once any leakage is found on the wall, If there are any leaks, seal them in time. Specifically, the following two methods are used to repair leaks.

Drainage pipe: Insert a drainage pipe at the seepage point of the foundation pit, seal it with quick-setting waterproof cement mortar around the drainage pipe, and then tie the drainage pipe after the cement mortar reaches strength.

Two-liquid grouting:

①Prepare chemical grout.

②Put the prepared chemical slurry and cement slurry into the slurry storage tank for later use.

③ Start the grouting pump during grouting, and connect the Y-shaped joints through two grouting pumps and two pipelines at the same time to mix and inject the reinforced soil at the bottom of the hole from the outlet.

④ During the grouting process, the flow rate and pressure should be controlled as much as possible to prevent slurry loss.

⑤Construction parameters.

Grouting pressure: 0.3-0.8Mpa Grouting flow: 25-35l/min Grouting volume: 0.375m3/linear meter Grouting ratio:

A. Liquid water: cement : Bentonite: External admixture = 0.7: 1: 0.03: 0.03 The cement is made of ordinary Portland cement, grade 32.5.

B. The liquid water glass should use a wave width of 35-40°blA liquid: B liquid = 1:1. Initial setting time: 45 seconds. Solidification strength: 3-4Mpa/2h2. To ensure the strength and uniformity of the pile body, the following requirements must be met:

① The cement flow and grouting pressure are manually controlled, the cement dosage and liquid level in each mixing barrel are strictly controlled, and the water consumption is controlled in total. And use a hydrometer to check the specific gravity of the cement slurry at any time.

② The soil should be fully stirred, and the sinking and lifting speed of the borehole should be strictly controlled to fully break the undisturbed soil, which is conducive to even mixing of cement slurry and soil.

③ The slurry cannot segregate. The cement slurry should be made strictly according to the predetermined mix ratio. In order to prevent the mortar from segregating, it must be stirred for 30 seconds before placing the slurry and then poured into the slurry storage bucket.

④ During the grouting stage, the grout pipeline must not be blocked, and grout breakage is not allowed. The entire pile must be grouted evenly, and no soil-slurry sandwich layer may occur.

⑤ If the pipeline is blocked, the pump should be stopped immediately. After the treatment is completed, immediately lift the mixing drill tool up and sink 1.0m before grouting can continue. Wait 10 to 20 seconds to resume upward lifting and stirring to prevent pile breakage.

8. Technical measures to ensure project quality

8.1 Key construction technology and guarantee measures In order to achieve the quality standards specified in the design drawings and construction acceptance specifications, in addition to the human, machine, material, In addition to the full process control of all aspects of law and environment that affect quality, specific attention should be paid to the following aspects:

(1) The construction site should be leveled first, and surface hard objects and underground materials in the construction area should be removed. Obstacles, when encountering open ponds (ponds) and low-lying land, water should be pumped and dredged, clay soil (or replacement soil) should be backfilled and compacted in layers, and subgrade boxes should be laid. The subgrade bearing capacity should meet the requirements for the translation and walking stability of the heavy-duty pile driver. , ensure that the verticality of the mixing pile meets the design requirements.

(2) The cement mixing pile should be trial-formed according to the design requirements to determine the cement slurry water-cement ratio, pile-forming process and construction steps actually used in this project. The trial pile is set to 2-3 Group.

(3) The project plans to use a computer-measured automatic mixing system and bulk cement tanks to ensure the stability of the slurry quality. If the mixing slurry is left aside for more than 2 hours for any reason, it should be treated as waste slurry and reuse is strictly prohibited. .

(4) Strictly control the sinking speed and mixing lifting speed of the mixing pile, and maintain a uniform sinking (lifting) speed. During mixing and lifting, negative pressure should not be generated in the hole to cause settlement of the foundation around the dam. Clearly mark the barrel, and strictly control the heights of the top and bottom of the water-isolating curtain piles.

(5) In order to improve the water isolation quality of the retaining piles, this project adopts the full-section repeated overlapping process of three-axis mixing piles. If the overlap time between piles exceeds 24 hours, it should be recorded as a cold joint, and technical measures such as making additional mixing piles at the overlap should be taken to ensure the quality of the overlap of the mixing piles.

(6) Each shift (24 hours) randomly inspects 1 group of triple (7.07cm×7.07cm×7.07cm) standard mold cement and soil test blocks. The sampling should be representative and tested after 28 days of natural curing measurement. The unconfined compressive strength of the block should meet the design requirements.

(7) Carefully fill in the cement records and corresponding reports for each team for future reference.

(8) Check the construction records at any time during the construction process, and conduct quality assessments on each group of piles and inspection batches according to the prescribed construction technology. The focus of the inspection is: cement dosage, pile length, and the quality of the piles during the pile making process. No pile breaking phenomenon, mixing and lifting time.

(9) After the cement-soil mixing pile is completed, necessary quality tracking inspections can be carried out to understand the uniformity of mixing, the strength of the pile body, and the anti-seepage and water-proof effect. If there are individual pile bodies that do not meet the specified requirements, parts, effective remedial measures should be taken.

8.2 Quality control during the pile construction period

(1) Carefully carry out hierarchical technical briefings for each construction team and team members, as well as pre-job training, and hold certificates to ensure that Job quality.

(2) Ensure the use of cement with the designed strength level. The cement entering the site must be submitted for inspection in a timely manner and must be qualified before use.

(3) Strictly control the water-cement ratio (1.5-2.0) and mixing amount, and determine the sinking speed to be 1m/min and the lifting speed to be 2m/min.

(4) The construction machinery is good. JB-160 pile driver and ZKD85-3 Ф850 three-axis mixer should be inspected before entering the site, and timely maintenance and inspection should be carried out during construction; BW-200 grouting The pump should be repaired and maintained in a timely manner, and a set of emergency backup grouting pumps should be prepared to ensure the uniformity and continuity of grouting.

(5) Check and correct the verticality of the pile driver before construction.

(6) Strengthen the overall management of the above-mentioned construction quality points, implement a 24-hour duty system for the project department, and make good quality control records during the construction process.

(7) During the construction process, a dedicated person will be responsible for filling in the construction records. The construction record form will record in detail the pile position number, pile length, cross-sectional area, sinking (lifting) time and depth, cement consumption, Cement mixing ratio, water-cement ratio.

8.3 Engineering technical data management The data used during the construction process should comply with national and local standards. The data should be collected, organized, cataloged, summarized and bound, and original records should be provided for inspection and approval by relevant departments. File according to regulations after completion.

9. Safe construction measures

9.1 Safety management system

9.1.1 Safety responsibility

1. The project manager is responsible for safe construction Overall Responsible Person.

2. The deputy project manager has direct leadership responsibility for safe construction and specifically organizes and implements various safety measures and safety systems.

3. The project engineer is responsible for organizing the preparation and review of safety technical measures, safety technology disclosure and safety technology education.

4. The construction workers are responsible for the safe construction within their assigned construction scope and implement various safety technical measures.

5. Have full-time safety management personnel at the construction site responsible for safety management, supervision and inspection.

6. Each professional has their own safety responsibilities.

7. Every construction worker also has safety responsibilities.

9.1.2 Safety education Safety education is divided into two parts: general safety education and safety technology briefing. General safety education includes:

① Admission education for all employees before entering the construction site;

② Regular safety awareness education;

③ On-the-job education for new workers ;

④Education on safe operating procedures combined with training for various types of work.

Safety technical disclosures include:

①Technical safety disclosures for specific sub-projects and the use of new processes and new materials;

②Arrange production tasks for each time Safety technical briefings;

③ Daily on-the-job safety briefings.

9.1.3 Safety inspection

1. A comprehensive safety inspection shall be conducted once a month, and shall be carried out by persons in charge at all levels of the construction site and relevant business personnel.

2. Routine regular inspections every ten days, carried out by the construction workers.

3. The team conducts safety inspections every day in conjunction with on-the-job safety briefings.

4. According to the needs of project progress, professional departments will organize and implement irregular professional inspections.

9.2 General measures for safe construction

9.2.1 Construction machinery safety management

1. Data management establishes a usage account of machinery and equipment at the construction site to ensure Check whether the safe operation of mechanical equipment at the construction site is under control. The ledger contains the following contents:

(1) Acceptance letter for completion of installation and commissioning of large-scale construction machinery and equipment.

(2) Registration list of special types of workers (unit operators, drivers, crane workers and commanders).

(3) Safety technical briefing document for crew on-duty operations.

(4) Regular inspection data of mechanical equipment, rectification orders for hidden equipment hazards, and records of rectification situations.

(5) Visa form for equipment operation hours and shifts.

2. Use and maintenance

(1) In order to ensure the safe operation of mechanical equipment at the construction site, the first step is to ensure that the machinery and equipment are in good condition for use at the construction site. "Sick" mechanical equipment and mechanical equipment that lacks safety devices or has failed safety devices are not allowed to enter the construction site.

(2) The construction site is responsible for providing necessary conditions such as roads, water and electricity, temporary sheds or venues for mechanical equipment to enter the site for operation, and to eliminate obstacles or unsafe factors to the operation of mechanical equipment, which requires night operations. Set up adequate lighting.

(3) After the mechanical equipment enters the on-site operation point, the construction technicians shall provide written explanations of the construction tasks and safety technical measures to the mechanical operators.

3. Installation of large-scale mechanical equipment

(1) The installation location of large-scale construction machinery and equipment when entering the construction site is consistent with the location indicated on the site layout of the construction site, and the crane is not close to the overhead For transmission lines, if it is necessary to operate near the lines due to on-site conditions, safety protection measures must be taken before the operation can be carried out.

(2) The installation and disassembly of large-scale construction machinery and equipment shall be carried out by professional teams (groups) in accordance with the regulations of the original manufacturer, the technical plans designed by the mechanical equipment construction organization and the technical measures for safe operation. It is carried out under the unified command of the team (group) leader and monitored by technical and safety personnel.

(3) After the installation of large-scale construction machinery and equipment is completed, after debugging, trial operation and installation team (group) leaders, unit leaders, technicians, and safety officers, together with the construction site leader and the heads of relevant departments, Conduct acceptance inspection of equipment. After receiving the acceptance certificate, the equipment can be put into construction, production and operation only after the "acceptance qualified" sign is hung in a visible place, and the "mechanical performance" sign is placed.

4. Electric welding machine

(1) Have reliable rainproof measures;

(2) Primary and secondary wire (power supply, faucet) connection points There is a complete protective cover, and the secondary line uses a wire nose;

(3) There is good grounding or zero protection;

(4) The wiring must not be pulled or matched randomly. The welding handle is well insulated.

5. Acetylene generator

(1) The distance from the open flame is greater than 10m;

(2) Equipped with a flashback preventer;

(3) There is a safety chain and explosion-proof film. The safety device is flexible and reliable and can be used reasonably.

6. Gas cylinders

(1) All types of gas cylinders have obvious color markings and anti-shock rings, and are not allowed to be exposed to the sun in the open air;

(2) Acetylene The distance between the gas cylinder and the oxygen cylinder is greater than 5m;

(3) The acetylene gas cylinder is equipped with a flashback preventer when in use;

(4) The leather pipe is tightened with a chuck;

(5) Operators hold valid certificates to perform operations.

9.2.2 Construction electricity safety

1. General provisions

(1) The electricity used for on-site construction shall adopt a three-phase five-wire system.

(2) The distribution box is equipped with a main switch, and at the same time, there is one machine, one gate and one leakage protector.

(3) Lighting and power are separated, and the name of the equipment is marked on the socket.

(4) Cables and branch lines should be overhead or buried. Insulators should be used for overhead laying. They should not be tied directly to the metal frame. It is strictly forbidden to use bare metal wires for tying.

(5) Set up the power and lighting in the mobile electrical box.

(6) Use safe voltages for floor passages and lighting, prepare a construction plan for construction electricity, and have reliable safety technical measures, which can only be carried out after submission for approval.

(7) There is an effective safety management system for electrical equipment and facilities at the construction site. Professional electricians will regularly check and organize the on-site electrical wiring and electrical equipment and facilities, and solve problems immediately if any problems are found.

(8) Wherever touching or approaching live objects, measures such as insulation protection and safe distance protection shall be adopted.

(9) The safe carrying capacity of power lines and equipment selection is limited according to national standards.

(10) All electrical equipment and metal casings have good grounding and zero protection, and all temporary power supplies and mobile electrical appliances are equipped with effective secondary leakage protection switches.

(11) Use safe voltage in very humid places, set eye-catching electrical installation signs, and do not use electrical equipment without effective safety technical measures.

(12) After the installation of wires and equipment is completed, the power department and the safety department will inspect the construction site and they can be used only after they are qualified.

(13) Regularly provide electrical safety education to employees. Electricians, mechanics and other personnel who have not passed the assessment are not allowed to work.

2. Safety assurance measures

(1) The connector of the cable is connected to the junction box and attached to the wall. The junction box can be waterproof, dustproof, mechanical damage-proof and away from flammable, explosive and corrosive places.

(2) The distribution box used is an iron-shell standard electrical box that meets the requirements of JGJ59-99 specifications. The electrical device of the distribution box has one machine, one gate and one leakage protection.

(3) The length of the power cord of the switch box shall not exceed 30m, and the horizontal distance from the fixed electrical equipment it controls shall not exceed 3m.

(4) All distribution boxes and switch boxes are numbered, and the electrical inside the boxes is well matched.

(5) The resistance value of the working ground should not be greater than 4. It should be tested by an electrician once a month and original records should be kept.

(6) The grounding resistance value of each repeated grounding device of the protective neutral line shall not be greater than 10.

(7) To protect the neutral line, select an insulated copper wire of no less than 10mm2, and the unified mark is a green/yellow two-color wire. Do not use a green/yellow two-color wire as a load line under any circumstances.

(8) The metal casings and uncharged exposed conductive parts of all motors, electrical appliances, lighting fixtures, and hand-held power tools must be connected to zero for protection.

(9) Except for tower cranes, the power cords of all motors, electrical lighting appliances, and hand-held power tools are equipped with secondary leakage gate protectors.

(10) The distance between outdoor lamps and lanterns from the ground shall not be lower than 3m, and the distance between indoor lamps and lanterns shall not be lower than 2.4m. The fixed lighting is comprehensively arranged, the lighting voltage is not greater than 36V, and the protective connection is adopted.

(11) It is strictly prohibited to use flower wires and plastic glue wires as power cords of the drag box at the construction site. It is strictly prohibited to use wooden drag boxes, boards and civilian plastic shell drag boards.

9.3 Safety precautions for summer construction

9.3.1 Personnel protection measures

(1) Keep abreast of the high temperature reports issued by the meteorological department and adjust work and rest schedules in a timely manner , achieve a degree of relaxation and appropriate arrangements. If the forecast temperature exceeds 35 degrees Celsius, workers must take a break from 11:00 am to 14:00 pm. If the project requires continuous construction, it must be supervised and measures must be taken to ensure it.

(2) According to the number of construction workers, a sufficient amount of heatstroke prevention and cooling drugs (such as ten drops of water, cooling oil, human elixir, etc.) should be provided. Boiled water supply should be ensured at the construction site and meals should be strictly ensured to be clean and hygienic. If there are containers on site, a layer of insulation must be added to the top of the container to reduce the temperature in the container. Cooling equipment such as fans and air conditioners should be used as much as possible. If a person suffers from heat stroke, he or she should be sent to the nearest hospital immediately.

9.3.2 Equipment protection measures

(1) Standardized construction must be adhered to during construction, no violations of regulations or rough operations are allowed, and safety work during summer construction must be done well. All full-time and (part-time) safety officers and construction managers have strengthened inspections and strictly checked, and rectified problems immediately when problems were discovered to nip them in the bud.

(2) In the season when storms and thunderstorms are frequent, it is necessary to promptly grasp the meteorological information of different levels released by the meteorological department, conduct targeted evacuation of personnel and placement of equipment, and stop evacuation before the arrival of storms and thunderstorms. Construction, and reasonable reinforcement or placement of piling equipment, avoid being careless and taking chances.

10. Civilized construction measures

10.1 Site appearance management

1. Site appearance management at the construction site shall be divided into areas and blocks, and responsibility areas shall be implemented. The signs indicate that the living area management regulations are clearly displayed to everyone.

2. Develop a construction site health management, inspection, evaluation and assessment system.

3. Work on safety production operations is posted on the wall, with seven signs and one picture (basic situation of the project, name tags of project responsible persons, six discipline signs for safety, production safety counting signs, and ten safety technologies) Measures, fire prevention instructions signs, health instructions signs and construction site master plan).

4. Arrange safety production slogans and warning signs on site to ensure that there are no violations.

5. Hang signs in construction areas, office areas, and living areas, and set safety warning signs in dangerous areas. Set up traffic signs at major construction road intersections.

6. Ensure that the surrounding environment is clean and sanitary, so that there is no sewage spillage, and no dirt, materials, or garbage piled outside the fence.

7. The environment is clean and tidy, the water channels are smooth, domestic garbage is packed in woven bags for transportation every day, and the living area is regularly sprayed with pesticides to sterilize and eliminate harmful substances.

10.2 Material Stacking Management

1. All kinds of equipment and materials should be kept as far away from the operating area as possible, and are not allowed to be stacked too high to prevent them from falling down and injuring people.

2. Incoming materials should be stacked strictly according to the location specified on the site layout.

3. The on-site material clerk shall carefully check and accept the materials entering the site (including quantity, quality, and warranty certificate), and keep records (including vehicle number, train number, transportation unit, etc.).

4. Cement warehouses have management regulations and systems, and they are managed by listing. Cement is distributed based on the quota requisition form and is distributed within the quota. Warehouse managers carefully prepare detailed accounting records for cement receipt, delivery and storage.

5. Materials should be stacked strictly according to the site layout and avoid random piles, random placement, and mixed storage. In particular, it is forbidden to pile materials against walls or billboards to prevent accidents such as collapse due to stress. Accidents happen.

10.3 Management of construction personnel

1. The construction standards and requirements for offices, toilets, canteens, dormitories, etc. shall be implemented in accordance with relevant regulations.

2. Develop an "Office and Dormitory Sanitation Management System" to make the construction site tidy and hygienic.

3. The offices and dormitories are ventilated, bright, equipped with washroom facilities, and are managed by dedicated personnel.

4. It is strictly prohibited to connect power sockets privately or use large-capacity electrical appliances in the dormitory. The Construction Safety Department will conduct regular inspections and supervision.

5. Men’s and women’s toilets and bathrooms are provided in the living area and construction site, and sewage is discharged into septic tanks. Keep it clean, drain smoothly, and have dedicated personnel to manage it.

6. Set up a canteen in the living area to provide meals for workers and managers. And implemented in accordance with the requirements of the Food Hygiene Law. Meals are served in the canteen.

7. Set up a tea supply point at the construction site with tea disinfection facilities.

10.4 Public Security Management Measures

1. Obey the owner’s management regulations on social security, comprehensive management, family planning, traffic management, environmental protection, etc.

2. Establish a specialized security agency to provide unified leadership for public security and security work.

3. Set up a guard at the gate and strictly enforce the entry and exit system. All personnel must wear badges when entering the site. Non-project personnel must register when entering the gate and contact the guard. Only after the receptionist is identified can they enter.

4. Staff are limited to activities within the designated construction area of ??the project, and are prohibited from entering areas unrelated to the project without permission.

5. Staff members are not allowed to drink alcohol on the construction site or enter the construction site to work after drinking, and are not allowed to bring contraband into the construction site to maintain the safety of property and personnel.

6. After the material vehicle enters the unit and is loaded and unloaded, it immediately leaves the site and parks in the designated parking lot.

7. Strengthen the management of valuable materials, important equipment and large equipment at the construction site, strictly enforce relevant systems, and set up protective facilities and alarm equipment to prevent materials from being robbed, stolen or destroyed.

8. Extensively carry out legal publicity and "four defenses" education to improve the consciousness of the broad masses of employees in safeguarding project construction and observing disciplines and laws.

9. Frequently carry out safety inspections centered on fire, explosion and theft prevention, plug loopholes, and take preventive measures in a timely manner when hidden dangers are discovered to prevent problems.

10. Strengthen the management of the outsourcing team, set up dedicated personnel to educate the outsourcing team on laws and regulations, review and register the migrant workers participating in the construction, obtain temporary residence permits, and issue work permits before they can start work. Work. Investigate suspicious persons.

11. Environmental protection measures

11.1 Sanitation management

1. The construction site should always be kept clean and hygienic. The roads are smooth, solid, smooth and have drainage facilities.

2. The materials entering the site and the spoil transport vehicles do not carry sediment, and do not leave or scatter it along the way.

3. The living area should be kept clean and orderly indoors and outdoors, free of dirt, sewage, and garbage piled up in a centralized manner, and should be cleaned up in a timely manner.

4. The canteen has a dedicated person in charge of sanitation work and strictly implements the Food Hygiene Law and other relevant systems.

5. Ensure the supply of boiled water for drinking water and hygienic drinking utensils.

6. The toilets on site are cleaned by dedicated personnel.

11.2 Pollution Control

11.2.1 Atmospheric Pollution

1. Fine bulk materials such as cement should be stored indoors (or closed) or tightly covered, and unloaded Take effective measures to reduce dust during transportation.

2. The temporary road surface on site should be properly treated to prevent road dust.

3. When setting up mixing equipment on site, install a dust-proof device.

11.2.2 Water pollution

1. Oil and waste materials must not be poured into adjacent rivers to avoid pollution.

2. Control the flow direction of sewage generated during construction to prevent overflow, and set up a settling tank at a reasonable location to allow it to settle before being discharged to prevent environmental pollution.

3. The warehouse where oil is stored on-site shall be treated to prevent leakage, and measures shall be taken for both storage and use to prevent escape, leakage, dripping, and leakage from contaminating water bodies.

11.2.3 Noise pollution

1. The construction site shall formulate corresponding systems and measures for noise reduction in accordance with the "Noise Limits at the Boundary of Construction Sites of the People's Republic of China".

2. When performing operations with strong noise or vibration, strictly control the operation time. If it is necessary to operate continuously day and night, noise and shock reduction measures must be taken, the surrounding people should be taken care of, and the work must be reported to the relevant environmental protection unit for registration before construction.