Begging for septic tank construction organization design

Septic tank construction plan

1. Project overview

The project is located between Building 2 and Building 3 of Chun Shui An (Phase 7) 5 meters south. The model of the septic tank is: 2×13 septic tank. For details, please see the atlas "Reinforced Concrete Septic Tank". The atlas number is 92S214 (4). The specification of the septic tank is 14.35×6.75× 5.6m.

1. Materials used:

1) Pool bottom cushion: use 10cm thick C10 concrete;

2) Pool wall and bottom plate: use C25 concrete ( Impermeable grade S6), Class I steel bars;

3) Cover plate: use C25 concrete, Class I steel bars;

4) Plastering: the inner and outer surfaces of the pool wall, the bottom of the pool and The upper surface of the pool roof is plastered with waterproof mortar (1:2 cement mortar mixed with a waterproofing agent accounting for 5% of the cement weight), with a thickness of 20. If there is underground water, apply hot asphalt twice on the outer surface of the pool wall and the upper surface of the pool roof.

5) Use M7.5 grade cement mortar under the manhole cover, with a thickness of 10.

6) The raw steel bars are all designed according to Grade I steel bars. If necessary, Grade II steel bars with a smaller original diameter can be used. There should be sufficient overlap length and anchoring length.

7) After the civil construction of the septic tank is completed, the soil around it should be backfilled as soon as possible. It is required to backfill and compact it in layers. The top soil of the tank should not be tamped too heavy.

2. Earth excavation project

(1) This project adopts natural foundation and stressed retaining shear wall, conjoined floor pool wall foundation, and strip foundation. The bearing capacity of the foundation shall be based on the requirements of each structure.

Based on the actual situation of the project and the conditions of the construction site, it is planned to use mechanical and manual excavation methods for earth excavation.

1. Site leveling: Before earth excavation, the site should be leveled according to the scope and elevation of the design or construction requirements. Within the construction scope, the soft soil layer, silt, humus soil, and stones that affect the construction should be removed. , garbage, tree roots, turf, etc., should be removed on a case-by-case basis.

2. Foundation setting out: Before earth excavation, foundation setting out should be carried out based on the existing control coordinates and level points on site. The laying-out is carried out using a total station and theodolite, and the positioning is controlled by gantry piles. See the picture below:

3. Foundation trench excavation: Determine the excavation scope according to the construction setting line. During excavation, the grading coefficient can be determined according to the actual situation.

4. Use natural foundation, and backfill part of the foundation soil is tamped. After treatment, the bearing capacity characteristic value of the foundation soil meets the requirements.

5. After the foundation pit is excavated, the relevant parties must be notified to inspect the trench. Foundation construction can only be carried out after the foundation bearing capacity is confirmed.

6. The quality and elevation of the foundation sandstone or concrete cushion must meet the design requirements.

7. Internal transportation of earthwork: Since the construction site is small, the earthwork should be cleared and transported in time after excavation. When transporting earthwork within the site, attention should be paid to environmental protection. Vehicles transporting earthwork should be covered to prevent dust from flying; the tires of vehicles should be rinsed before leaving the construction site to prevent sludge from affecting the road surface.

(2) Construction process flow

Positioning and laying out→mechanical excavation (excavation to the bottom of the floor)→slope maintenance→manual cleaning→establishing a drainage system.

(3) Construction sequence

After positioning and setting out, the excavator will excavate from northwest to southeast, cleaning and transporting while digging.

(4) Construction personnel and equipment equipment

Excavation personnel: 1 on-site commander, 1 technician, and 1 safety officer.

There are 2 to 3 surveying and setting personnel, 1 mechanical maintenance personnel, and 15 excavators.

Construction equipment: 1 backhoe, 2 dump trucks, 5 water pumps.

(5) Earth excavation measures

1) According to the drawing design, the earth at the bottom of the septic tank floor should be dug down 5.6m from the original ground. Grading value: 1:0.75~1:1.10, the grading coefficient can be determined according to the actual situation. The earthwork of this project adopts mechanical excavation and manual trimming. In order to reduce the disturbance to the foundation soil, the last 20 to 30 cm of earth should be left for manual excavation and trimming; the areas around the foundation pit, water collection wells, floor ditches, and adjacent elevation differences should be strictly followed Construction drawing attached. Try to avoid over-excavating and under-excavating any part.

2) A small part of the foundation pit earthwork is first excavated by a small bucket excavator. In order to prevent mechanical overexcavation and maintain the correct side slope, when the mechanical excavation is close to the designed pit bottom elevation or side slope boundary, it should be Reserve a 20~30cm thick soil layer, and then use manual excavation and slope repair.

3) When the excavator is excavating, 2 to 5 handymen should be assigned to follow the excavator to trim the earthwork on the slope of the foundation pit according to the size of the foundation pit. The trimmed earthwork should be concentrated in the excavator operation in a timely manner. Within the radius, the excavator will transport the soil to the soil placement point to make full use of the machinery to maximize work efficiency, save labor and reduce project costs.

4) During the excavation process of the foundation part, the disturbance to the soil layer should be minimized, the amount of soil excavated by the machine should be reduced, the construction speed should be accelerated, and the machine should exit the site after digging at one time. If special circumstances still exist, they must be reported to the owner, supervision department and project department in a timely manner, and the construction plan shall be re-established based on the actual geological conditions on site.

5) During earthwork excavation, after the gray line of the foundation pit should be released, the earthwork for the foundation beam of the cap platform should be excavated. The position of the brick mold should be considered for the edge line of the excavation. During the earthwork excavation, a dedicated person should be assigned to control the plane size and Bottom elevation.

6) After the earth excavation is completed, the relevant departments should carry out the acceptance of the foundation pit. Only after the concealed acceptance is completed, the next construction process can be carried out.

(6) Quality requirements: Construction must be carried out in strict accordance with the specifications to prevent the occurrence of excessive standards.

(7) Safety measures

(1) The distance between excavators should be greater than 10m, and no one is allowed to stand within the rotation radius of the excavator; within the working range of the excavator No other work is allowed inside.

(2) During operation, you should always pay attention to the condition of the soil wall. If cracks or collapse are found, support or slope them in time.

(3). The excavator should be at a certain safe distance from the slope. To prevent collapse and overturning accidents.

(4). Steps or supporting ladders should be dug up and down the deep foundation pit, or slopes should be opened and anti-slip measures should be taken. It is prohibited to step on the supports. Safety railings should be installed around the pit.

(5). The safe distance between heavy objects and the slope: the car should not be less than 3m, and the material stacking should not be less than 1m.

(6) Personnel entering the construction site must wear safety helmets; construction personnel in the foundation pit must pay attention to the stability of the adjacent earthwork at all times. If there is danger, all construction personnel must evacuate in time.

3. Foundation precipitation and drainage measures:

During foundation pit excavation, attention should be paid to preventing foundation pit soaking, which may cause collapse and landslide accidents, and to ensure that the foundation is dry.

(1) Dewatering wells: 3 dewatering wells have been set up outside the edge of the building location, and the depth of the wells is 1 meter below the floor of the septic tank. The water pumping capacity of the dewatering and drainage well is about half a well, 3 m3/h, and drainage ditches and water collection pits are arranged. See the basic plan on page 4 for its layout.

(2) Drainage in the pit: The drainage in the foundation pit is systematically laid out with open ditches and water collection wells. The drainage ditch is continuously arranged around the foot of the basement foundation pit. The ditch section has a clearance of 0.4 and a depth of 0.8. It is lined with red brick mortar and uses a sewage pump to drain water to the ground drainage ditch intercepting ditch system. The setting of the water collection pit should be no less than 1.0~1.8 meters from the bottom edge of the foundation. During excavation, the location should extend about 0.5 meters beyond the foot of the pit bottom slope. It has a certain drainage slope (4~18%), the real diameter of the gravel in the ditch is 3~5cm, the top surface is the bottom of the cushion, the ditch distance is 10~15 meters, and the drainage is directed to the drainage ditch sump beside the foundation pit.

(3) Ground drainage is provided with an external drainage ditch and a 0.3-meter-high retaining embankment at a distance of 1.0 from the edge of the foundation pit to prevent surface water from flowing into the foundation pit, and collect drainage and precipitation well water in the pit through setting sinks. The sand pond is discharged into municipal canals.

IV. Construction of waterproof concrete projects

The quality of waterproof concrete structure projects depends not only on the excellent design, the properties of the materials and the ingredients, but also on the quality of the construction. Good or bad. Therefore, all major links in construction, such as concrete mixing, transportation, pouring, vibration, maintenance, etc., should be carried out in strict compliance with the construction and acceptance specifications and operating procedures. Construction personnel should establish a sense of responsibility to ensure the quality of the project, and pay attention to the construction quality requirements, be tightly organized, implement measures, and perform meticulous construction.

(1) Construction preparation

1. Prepare the construction organization design, select an economical and reasonable construction plan, improve the technical management system, formulate technical measures, implement the technical post responsibility system, and do Good technical briefing and preparation for quality inspection and assessment.

2. Carry out raw material inspection. All raw materials must meet the prescribed standards; prepare enough materials, keep them properly, and stack them according to varieties and specifications. Pay attention to preventing dirt and other dirt from seeping into the aggregates.

3. The required tools, machinery, and equipment should be fully equipped and ready for use after inspection and testing.

4. According to the designed impermeability level, the waterproof concrete is sent for inspection and trial mix ratio work is carried out.

5. Do a good job in foundation pit drainage and prevent ground water from flowing into the foundation pit to avoid constructing waterproof concrete structures with water or mud.

(2) Templates

1. The templates should be flat and the joints should be tight without slurry leakage. They should have sufficient stiffness, strength, and low water absorption. Steel molds should be used. , wooden mold is suitable.

2. The formwork structure should be firm and stable, able to withstand the lateral pressure and construction load of the concrete mixture, and should be easy to install.

3. When using pull bolts to fix the formwork, a water stop ring should be welded on the embedded casing or bolts. The diameter and number of rings of the water stop ring should comply with the design requirements. If there are no design requirements, the diameter of the water stop ring is generally 8~10cm, and there must be at least one ring.

The method for fixing the formwork with cross-tension bolts is as follows:

Weld a water-stop ring in the middle of the cross-tension bolt. The water-stop ring and the bolt must be fully welded tightly. After removing the formwork, the bolts should be cut along the edge of the concrete structure.

(3) Steel bars

The steel bars should be firmly tied to each other to prevent the buckles from loosening due to collision and vibration when pouring concrete, causing the steel bars to shift and cause the bars to be exposed.

When tying steel bars, a sufficient protective layer should be left in accordance with the design requirements, and there should be no negative error. If the protective layer is left, the steel bars should be padded with pads made of fine stone concrete or cement mortar with the same mix ratio. It is strictly prohibited to use steel bars to cushion steel bars, or to fix the steel bars directly on the formwork with iron nails or wires.

Reinforcement bars and iron wires must not come into contact with the formwork. If a water stop ring is welded on the iron horse stool, it will prevent water from penetrating into the concrete structure along the iron horse stool.

When the dense arrangement of steel bars affects the normal pouring of concrete, you can consult with the designer and take measures to ensure the quality of concrete pouring.

(4) Concrete mixing: In order to ensure good homogeneity of waterproof concrete, commercial concrete is used. Commercial concrete is planned to be produced by manufacturers that have passed ISO9002 quality certification to ensure its quality.

(5) Concrete transportation

During the transportation process of concrete, it is necessary to prevent segregation and loss of slump and air content. At the same time, it is necessary to prevent leakage of slurry. The mixed concrete must be Pour in time. It should be transported to the site within half an hour at normal temperature and completed before initial setting. When the transportation distance is long or the temperature is high, retarding water reducing agent should be added. When significant bleeding and segregation occurs before pouring, an appropriate amount of cement slurry with the original water-cement ratio should be added and mixed evenly before pouring.

(6) Vibration for concrete pouring

Before pouring, water, wood chips, iron wires, nails and other debris in the formwork should be removed, and the formwork should be moistened with water. When using steel formwork, the surface should be kept clean and free of laitance

The self-falling height of poured concrete should not exceed 1.5m. Otherwise, tools such as string tubes, chutes or chute pipes should be used for pouring to prevent the accumulation of stones. affect quality.

Concrete pouring should be done in layers, the thickness of each layer should not exceed 30~40cm, and the time interval between two adjacent layers of pouring should not exceed 2 hours.

Waterproof concrete should be mechanically vibrated, which can produce vibrations with small amplitude and high frequency. The friction and adhesion between aggregates are reduced, and the fluidity of cement mortar is increased. During the settlement process, the coarse aggregate dispersed due to vibration is fully wrapped by cement mortar to form a mortar coating layer with a certain quantity and quality. At the same time, air bubbles in the concrete mix are squeezed out to enhance compactness and impermeability.

Mechanical vibration should be vibrated successively and densely in accordance with the relevant provisions of the current "Code for Construction and Acceptance of Concrete Structure Engineering" to prevent leakage and under-vibration.

(7) Curing of concrete: The curing of concrete has a great impact on its impermeability, especially early moist curing is more important. Generally, the concrete enters final setting (4~6 hours after pouring). It should be covered, and the concrete must be kept moist for curing. After the concrete is poured, watering and curing can be started according to the following time:

When the temperature is 5~200C, start watering 18h;

The temperature is When the temperature is 20~250C, start watering after 10 hours;

When the temperature is above 250C, start watering after 6 hours.

The curing period shall not be less than 14 days. Keep the exposed concrete surface moist during the curing period.

(8). Remove the formwork

Due to strict maintenance requirements for waterproof concrete, it is not advisable to remove the formwork prematurely. When removing the formwork, the strength of the waterproof concrete must exceed 70% of the design strength level, and the difference between the concrete surface temperature and the environment should not exceed 150C to prevent cracks on the concrete surface. When removing the formwork, be careful not to damage the formwork and waterproof concrete structure.

(9) Protection of waterproof concrete structures

After the structural part of the project is removed from the formwork, the construction of the next sub-project should be carried out as soon as possible.

Concrete waterproofing It is strictly prohibited to drill holes after the structure is poured. Small holes that appear should be repaired in time. When repairing, first rinse the holes, apply a layer of cement slurry with a water-cement ratio of 0.4, and then fill and smooth it with 1:2.5 cement mortar with a water-cement ratio of 0.5.

(10) Detailed methods for special parts

Embedded iron parts, wall-penetrating pipes in waterproof concrete structures, and post-pouring joints of the structure are all possible causes of leakage. In weak areas where water leaks, measures should be taken and construction should be carried out carefully. Now we will introduce some methods:

1. Waterproofing method of embedded iron parts

○1. Welding water-stop ring method of casing

Use welding The method of water-stopping steel plates is simple and can achieve a certain waterproof effect. When there are many embedded parts, the method of using one water-stop steel plate for many embedded parts can be used. During construction, attention should be paid to pouring the concrete around the iron parts and water-stopping steel plates tightly to ensure quality.

2. Waterproofing treatment of through-wall pipes

○1 Casing welding water stop ring method

Where the pipe passes through the waterproof concrete structure, the sleeve is embedded The water-stop ring should be welded to the pipe and casing. The water-stop ring should be fully welded to the casing and the number of water-stop rings should be as specified in the design. The water stop ring should be fully welded to the casing and the number of water stop rings should be as specified in the design. When installing a wall-penetrating pipe, first pass the pipe through the embedded casing, find the location and size according to the figure, and temporarily fix it. Then use a sealing steel plate at one end to weld the casing and the wall-penetrating pipe firmly, and then secure the casing from the other end. After the gap between the wall pipe and the wall pipe is filled with waterproof materials (waterproof ointment, asphalt mastic, etc.), it is sealed tightly with a sealing steel plate.

○2. Single pipe embedding method

There are two methods: cast-in-place and reserved holes. Although the structure is simple and the construction is convenient, they cannot adapt to deformation and are inconvenient. Replacement is generally not suitable. When burying pipes using this method, attention should be paid to pouring and compacting the concrete around the pipes and water-stop rings, especially at the bottom of the pipes.

V. Quality inspection of waterproof concrete structures

(1) Inspection during construction

Concrete raw materials must comply with current national standards, construction and acceptance specifications and design regulations.

The admixtures used should have factory certificates and instructions for use, and all performance indicators should be qualified upon on-site re-inspection.

Check whether the weighing of concrete mixture ingredients is accurate, such as mixing water consumption, cement weight, admixture dosage, etc.

Check the slump of the concrete mix at least twice per job. The air content of waterproof concrete mixed with air-entraining admixtures should also be measured.

Check the size, sturdiness, gaps and debris of the template, and correct any deficiencies in a timely manner.

Check whether the detailed structure of reinforcement, steel protective layer, embedded iron parts, and wall pipes is designed and meets the specification requirements, and correct problems in a timely manner.

Inspect the maintenance of concrete structures.

(2) Inspection after structural construction

Quality certification documents, test reports or inspection records of various raw materials.

Concrete strength and impermeability test report sheet.

Acceptance records of sub-projects and concealed projects.

Appearance inspection to see whether there are honeycombs, pitted surfaces, holes, exposed tendons and other quality defects, whether detailed structures such as wall pipes and deformation joints are tightly sealed, and whether there are leaks in the entire structure. The exact location, analyze the cause of leakage, take measures, and repair it in time.

6. Backfilling project:

(1) Process flow:

Cleaning the base → Backfilling soil → Spreading soil in layers, raking soil → Compacting and compacting →Acceptance

(2) Main technical measures for backfill soil:

1) Please see the backfill soil sampling pilot map for the backfill area and test location.

2) Before filling, clean up the garbage and debris on the base layer, and remove the fallen loose soil, mortar, stones, etc.

3) Check whether the moisture content of the backfill soil is within the control range, determine the optimal moisture content and the corresponding maximum dry density through compaction testing, and control the difference between the construction moisture content and the optimal moisture content within Within the range of -4% to +2%, if the moisture content is high, measures such as plowing, drying, or evenly mixing dry soil and white ash can be used; if the moisture content of the backfill soil is low, measures such as pre-sprinkling and moistening can be used . Make the backfill soil clump into a ball and let it fall to the ground loosely.

4) The backfill soil is spread in layers. Using manual tamping, the thickness of each layer of virtual paving is 200mm; using a breaststroke tamping machine, the thickness of each layer of virtual paving is 300mm. Compaction coefficient is 0.9; dry bulk density is 1.6g/cm3. After each layer is spread, it is raked and then tamped.

5) Use a frog-type tamping machine or manual tamping to compact the backfill soil. Each layer should be compacted at least three times. Tamping should be done with one tamping and half tamping, tamping and ramming should be connected, rows should be connected, and vertical and horizontal crossings should be made. It is strictly forbidden to use the so-called "water compaction" method of pouring water to make the soil sink. For parts that cannot be tamped by the tamping machine such as narrow foundation grooves and yin and yang corners, manual tamping should be used, and no leakage of tamping is allowed.

6) When the deep and shallow foundation trenches are connected, the deep foundation trench should be filled and tamped first, and then it should be leveled and filled together with the shallow foundation trench in layers; when filling in sections, the joints of each layer should be made 1:2 ladder shape. The joints of the upper and lower layers are staggered by 1.0m.

7) The foundation trench backfilling is carried out simultaneously on opposite sides or all sides.

8) After each layer of backfill soil is compacted, take a set of ring knife samples every 30 meters for each layer outdoors and a set of 300m2 for each layer indoors. Measure the dry density of the backfill soil to reach Apply another layer of soil after request. The top surface of each layer of soil in the middle must be cleaned before backfilling can continue; after all filling is completed, a line should be pulled on the surface to level it. Any place that is higher than the allowable deviation should be leveled according to the line in time. Any place that is lower than the specified elevation should be replenished with soil. Tamp down.

(3) Construction during rainy season:

1. Before backfilling with earthwork, the accumulated water, silt and other debris around the bottom of the foundation pit must be removed.

2. Strictly control the moisture content of the backfill soil. Backfill soil with a moisture content that does not meet the requirements is strictly prohibited. Backfill soil temporarily stored on site should be covered with plastic sheeting to prevent rain.

3. Earthwork backfilling should be arranged on sunny days, carried out continuously, and completed as soon as possible. During the backfilling process, when it rains, cover it with plastic sheeting to prevent rainwater from getting wet on the compacted parts. Carefully test the moisture content of the filling soil before backfilling after rain. When the moisture content is high, spread the soil out to dry and backfill only after the moisture content test passes.

(4) Construction precautions:

1. During construction, attention should be paid to protecting positioning piles, axis piles, and elevation piles to prevent collision displacement.

2． During construction, the construction sequence should be reasonably arranged to prevent over-thickness of paving and filling. It is strictly prohibited for earth-moving trucks to directly dump soil into the trench.

7. Civilized construction measures

Civilized construction is the image of a construction enterprise. The degree of civilized construction reflects the comprehensive management level of the enterprise, promotes civilized construction, and formulates political measures during on-site construction. :

(1) Establish and improve the civilized construction guarantee system

Our company has a complete civilized construction guarantee system. There are civilized construction leading groups at both the company and branch levels. And carry out civilized construction inspection activities. The company conducts civilized construction site inspection and evaluation activities every quarter and once every month for branches. The project management department has made unremitting efforts to make civilized work a daily routine.

(2) Requirements for on-site material storage

The sand and gravel entering the site must be stacked in separate piles without debris, and the storage site should be made into a concrete surface.

Block piles should be placed in stacks and placed in a planned manner, and loose blocks and half-block heads should be piled together.

Components, semi-finished products, formwork, pipes, steel bars, and blocks must be stored neatly in categories at designated locations and stacked smoothly.

A designated person is responsible for the distribution of materials and strictly implements the quota regulations.

(3) Construction machinery, appliances and electricity management requirements

All construction machinery entering the site must be equipped with separate electrical boxes, leakage protectors and grounding neutral wires. The electrical boxes have Numbered, gated, with moisture-proof protection and safety warning signs.

There should be no overhead wires on site and cables should be used for power supply.

Construction machinery should be kept clean and maintenance workers should be carried out in accordance with regulations.

Mixers and mortar mixers must be equipped with operating and protective sheds. The protective sheds are neat, beautiful, strong and truly protective.

There are drainage channels around the mechanical platform to ensure that water is not injected into the construction machinery and equipment.

On-site mechanical parts must be inspected and cleaned promptly after use.

(4) Requirements for construction work surfaces

1. The quality of the project requires a good look and feel, with smooth beam-column joints, no expansion molds, honeycombs, pitted surfaces, exposed tendons and other quality accidents Have appeared.

2. After removing the formwork, there should be no residual formwork on the products. Remove the formwork and steel pipes and stack them in the designated place in a timely manner.

3. At the construction site, formwork, steel bars, wire ties, welding rods, fasteners, etc. are not placed randomly.

4. Dust, half-block heads, leftover materials and construction waste on the working surface should be cleared as the work is being done. Do a good job of cleaning three and five, and clean up the site after the work is completed.

5. The protective railings are erected in accordance with the specifications. The outer frame is vertical without bending, the level is consistent, the horizontal pipes are not obviously uneven, the fence is hung tightly, firmly and neatly, and there is no debris stacked on the frame.

(5) On-site publicity and people’s mental outlook

1. The general layout of the construction site, the construction description drawings of the main project management personnel, etc. must be hung on the site.

2. There must be a publicity board to promptly report on the progress of the project and site development, praise and reward advanced figures, and criticize and punish employees who violate disciplines.

3. All employees must wear safety helmets when entering the construction site. It is strictly forbidden to go to work barefoot, shirtless, or wearing slippers.

4. Safety and quality slogans and safety construction warning signs must be hung on the building.

5. All management personnel must be posted on duty and must be neatly dressed and courteous when entering and exiting Party A’s office.

6. Obey the supervision and guidance of the relevant personnel of Party A on the project. All construction workers must obey the guidance and suggestions, convince others with reason, and must not contradict Party A and outsiders.

(6) Measures to ensure safety

1. Establish and improve the safety guarantee system

○1. The project manager is the first person responsible for safety production. The deputy manager in charge of production is the main responsible person, the quality safety supervisor is directly responsible for safety production, and the quality safety officer is responsible for supervision and inspection of safety production and construction quality.

○2. The economic contract signed between the project and various work teams must have safety contracting clauses, and the safety contracting clauses must be linked to bonuses and wage levels.

2. Safety Guarantee Plan

○1. Strictly implement the ministry-issued standards "Safety Technical Operating Procedures for Construction and Installation Workers", "Safety Specifications for Power Supply at Construction Sites" and "Construction Construction Safety Inspection Scoring Criteria.

○2. Conscientiously implement the "One Standard and Three Norms" issued by the Ministry of Construction and the company's relevant regulations on safe construction management systems, so as to achieve "safety first, prevention first". During project construction, quality The Safety Department is responsible for the entire construction safety technical guidance and inspection management.

○3. Construction personnel entering the site need to undergo strict "three-level" safety education, that is, the first-level education of the company, branch, and project department, so that the construction personnel are familiar with safety technical operating procedures and do a good job in inspections Registration records.

○4. Special types of work (i.e. electricians, welders, loader drivers, machinery operators, etc.) must hold certificates to work.

○5. All personnel participating in the site must be familiar with the "Safety Technical Operating Procedures for Construction Workers". The construction workers and foremen should conduct safety technical briefings based on the characteristics of this project. It is strictly prohibited to operate under the influence of alcohol.

○6. On-site construction machinery must lay a concrete foundation in accordance with the requirements of the "Regulations" and the instructions for use of mechanical equipment. It can only be installed and used after acceptance and concealed signature by the chief engineer and the equipment management department.

○7. Implement a captain management system, conduct regular inspections, maintenance and records of machinery to prevent equipment accidents. All electrical appliances should be grounded and connected to zero, and leakage protectors should be installed. It is strictly prohibited to use one gate for multiple purposes.

○8. Do a good job in preventing "three treasures and four mouths", set up protective railings, wires must be overhead, and it is strictly prohibited to tie them directly to steel pipes.

○9. All temporary facilities on site should be equipped with fire-fighting equipment.

○10. Fire prevention measures should be taken during welding and butt welding on the construction site. Red-hot steel bar heads must not be left lying around and should be processed and cooled in time to avoid fires in scaffolding boards, fences and other turnover materials. .

○11. Before the construction team enters the construction site, the person in charge of each type of work must refer to the spirit of the company's relevant regulations on production safety and make relevant targeted safety briefings to the construction team in written and oral form in conjunction with the site;

○12. Regularly organize safety technical training and learning for each construction personnel to improve the safety awareness of each employee.

○13. All safety facilities, signs, and protective equipment will be inspected and accepted by security personnel after they are installed. No one is allowed to use, dismantle, or move without the permission of full-time security personnel.

(7) Protection measures for safe use of electricity and electromechanical equipment

1. The layout drawing for construction electricity should be reviewed and approved, and the specifications of power supply equipment and wires should be determined. Electrical boxes, switch boxes, leakage protectors, etc.

2. Electricians must go through special training and assessment in the local city and be certified to work, and they must perform installation operations in accordance with the "Safety Code for Power Supply at Construction Sites". Illegal operations are strictly prohibited.

3. The temporary power lines on site must adopt the "three-phase five-wire system". All electrical equipment must have unified grounding protection or zero connection protection. It is not allowed to connect one part to the ground and the other to zero. Power and lighting are separated, and there are two-level leakage protection devices. The allowable current of the power supply line must meet the requirements.

4. Electricians understand the basic knowledge of self-protection and the protection of others, and must be responsible for installation work.

5. Before the construction power lines are put into use, they should be inspected and accepted before they can be used for power supply.

6. Electricians on-site should frequently check power lines, leakage switches, electrical equipment and grounding and zero connections. If problems are found, they should be dealt with in a timely manner. Those responsible for accidents should be held accountable.

7. The external wires should be erected firmly, and the exposed parts of the joints should be bandaged. Wire ropes should be tightened when the poles are cornered, and random pulling is strictly prohibited.

8. When cables must span or be placed on steel pipe scaffolding, they should be isolated by insulators and cannot be placed directly on steel pipes or steel bars.

9. When the cable passes through the road, it should be erected on an empty pole (the height should meet the requirements) or buried in trenches (protective pipes should be installed, with isolation protection and waterproof measures at both ends).

10. The main distribution box, distribution box, and unstaged switch box are all equipped with leakage protection devices. Lightning protection devices are installed as appropriate, and their resistance must be measured to be less than 10Ω.

11. "One machine, one gate and one leakage protection" must be implemented on site. It is strictly forbidden to use one gate for multiple purposes. Water pumps and electric tools put into use should be in good condition and the leakage devices are reliable.

12. Sufficient lighting is required for night operations. Electricians on night shift are not allowed to leave their posts without permission, and should replace lights immediately if they find they go out. Lighting equipment should be installed in dark places, openings and passageways to ensure the safety of construction workers.

The rest shall be managed and constructed temporarily in accordance with the "Safety Code for Power Supply at Construction Sites".