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Steel structure independent foundation construction plan

Chapter 1, preparation instructions

1. Preparation basis

1. Current national building installation Specifications for Quality Acceptance of Engineering Construction

2. "Specifications for Acceptance of Construction Quality of Building Foundation Projects" GB50202——2002

3. "Specifications for Acceptance of Construction Quality of Masonry Engineering" GB50203——2002

4. "Construction Quality Acceptance Code for Concrete Structure Engineering" GB50204-2002

5. "Construction Quality Acceptance Code for Building Water Supply, Drainage and Heating Engineering" GB50242-2002

6. "Code for Acceptance of Construction Quality of Building Electrical Engineering" GB50303——2002

7. "Code for Acceptance of Construction Quality of Steel Structure Engineering" GB50205——2001

8. Standard for Test Methods of Steel Welded Joints" JGJ/T——2001

9. "Code for Quality Acceptance of Building Decoration and Renovation Projects" GB50201-2001

10. Nanhu Hotel Dormitory Building Project Construction Design and preparation of construction drawings for construction, construction, and water and electricity installation projects

Chapter 2, Project Overview

Building Overview

This project is the dormitory building project of Nanhu Hotel , with a total construction area of ??approximately 3176.08 square meters, the main structure is a four-story steel frame structure, and the total height of the cornice is 15.450 meters. The fire resistance level is Level 2, the service life is 50 years, and the seismic intensity is 8 degrees. The foundation is a cup-shaped independent (double cup) foundation, the beams and columns are all Q235B H-shaped steel, the floors and roofs are all pressed steel plate concrete non-combined floors, the maintenance structure is 200mm thick aerated concrete blocks, and the inner walls are 150mm thick ALC reinforced concrete. plate.

Chapter 3, Preliminary Construction Preparations

Section 1, Site Preparation

1. The focus is on the plane control points and level control points handed over by the owner We will conduct pilot testing, review and handle relevant handover procedures.

2. Preparation of temporary facilities: mainly including offices, duty rooms, power distribution rooms, cement warehouses, walls, roads, tool rooms, gates, steel processing sheds, formwork processing sheds, toilets, etc. The living area mainly includes office space, staff dormitories, canteens, bathrooms, etc.

3. Site preparation: Set up the on-site drainage system. All rainwater and sewage discharged on site will be discharged into the rainwater and sewage pipe network through drainage pipes in an organized manner in accordance with relevant regulations of Tangshan City.

4. Construction water and electricity preparation: The construction unit has provided 400KVA transformer and DN50 water source. The main work includes the layout of water and electricity lines in the construction area and living area and the laying of water inlet and drainage pipes.

Section 2, Technical Preparation

1. Before construction, the safe and civilized construction plan, site master plan and other relevant information must be reported in a timely manner to the Municipal Construction Management Bureau, Safety Station and Construction, Supervise the review and approval and implement it according to the review and approval opinions.

2. Organize all professional foremen, team leaders, and technicians to read the drawings carefully, participate in the drawing review, and become familiar with the design intent and related details. Carry out lofting and calculation work for various types of steel bars and formwork. Determine the geometric parameters required for construction measurements. Develop test plans and conduct trial mixes of concrete.

3. Based on the content of each sub-division and sub-project, calculate the project quantities, conduct a work and material analysis, and prepare a construction plan accordingly.

Section 3, Material Preparation

1. Analyze the demand for materials according to the progress requirements of each period, and make statistics on the name, specifications, usage time, and quantity of the materials. , Summarize and prepare purchasing plans, determine stacking and storage sites and organize transportation.

2. All required materials must be reported three days in advance to facilitate timely procurement.

Section 4, Personnel Organization

Chapter 4, Construction Process and Progress Plan

1. Construction Process:

Positioning Line machinery excavation, earthwork cushion construction, column and wall construction, foundation beam construction, masonry foundation branch acceptance, foundation earthwork backfill, steel structure construction, floor slab construction, masonry and partition wall construction, water supply and drainage construction, electrical construction, decoration and decoration construction, self-inspection, rectification and completion acceptance

2. Construction arrangements:

2.1. Based on preliminary on-site positioning and observation, 1:0.75 shall be used for grading when excavating earth.

2.2. Please see the attached figure for the construction period and progress plan of each sub-project.

Chapter 5, Construction Plan of Main Sub-projects

Section 1, Foundation Construction

1. Building Axis Positioning:

1.1. Basis for positioning points: Position the construction site according to the three positioning points 01, 02, and 04 provided by the surveying and mapping department.

1.2. Measurement and positioning tools:

1.2.1. The positioning of each peripheral axis of the building is carried out using J2 theodolite.

1.2.2. The elevation measurement is carried out using N2 level.

1.2.3. Auxiliary tools: wooden piles, steel piles, 50M steel ruler, cotton thread, iron nails, red paint, etc.

1.2.4. The on-site theodolite is set up at 1 o'clock, and the theodolite lens is closed at 2 o'clock on the east side and rotated 900 degrees. Closure at the 4 points provided by the southwest surveying and mapping unit meets the requirements. Then put the theodolite on 4 o'clock, align the lens on 1 o'clock and rotate it 900 degrees. Use a steel tape measure to measure 61.04M on the B-axis to determine the point where the 11-axis intersects with the B-axis. Then put the theodolite on the 11-axis intersection. At the B axis point, the lens is aligned with the 1 axis and the B axis point is closed. Rotate the lens 900 and align it with the 2 axis point. Then use a steel tape measure to measure 13.12 meters from the point where the 11 axis intersects the B axis. Determine the 2 provided by the Bureau of Surveying and Mapping. The closure points are all in compliance with construction measurement requirements.

1.3. Based on the known axis points and control points, the position of each relevant axis can be measured and positioned using theodolite and steel ruler.

2. Earth excavation and backfilling project

1. Geological overview

According to the geological survey report, the foundation soil quality of this project is good, and the independent foundation is located in the ○ On the 3rd layer of clay layer, fak=260kpa or more. It can be seen from the geological survey report that the groundwater level of this project is low and there is less groundwater. And it is non-corrosive to the foundation concrete.

2. Earth excavation

2.1. Before construction of this project, the drawings should be read carefully and familiar with the actual conditions of the site and the difference between the actual elevation of the site and the design elevation. Understand the basic design depth of this project. Before earth excavation, review the difference between the designed axis and the actual axis, and proceed to the next step of construction when the design requirements are met.

2.2. When excavating the foundation trench, if the soil layer is found to be inconsistent with the geological report, or abnormal conditions such as grave wells, dry wells, weak soil layers for civil air defense works, etc., the construction unit and the geological survey department should be notified immediately. , Design Institute and other relevant department personnel went to the site to study and solve the problem. All earth excavated in this project will be transported out of the country.

2.3. When large-scale mechanical excavation is used, it must be carried out in layers and sections, and a dedicated person is designated on site for command. The horizontal excavation of earth starts from the intersection of the ○1 axis and the C axis and advances to the ○2 axis. 〈Excavation from east to west〉

2.4. During the excavation of earthwork, designate a dedicated person to carry out elevation control, follow-up measurements, and beware of over-excavation. The thickness of the earthwork reserved at the bottom of the pit is controlled to 100mm, and the thickness is no more than 100mm. 1. When the area is small, leveling may not be done to prevent disturbing the base soil.

3. Precipitation and drainage for earth excavation

3.1. Preparation of precipitation measures according to the geological survey report. The groundwater level of this project is low, and a large amount of groundwater may not be encountered during foundation excavation.

However, considering that rainy weather will inevitably be encountered during foundation construction, precipitation and drainage systems must still be prepared during earth excavation. Drainage ditches of .05M×0.7M are mainly arranged around the foundation pit, and 0.8M×0.8M are set up at each corner. × 1.0M water collection pit. During construction, the earth in this area should be excavated first, and the pit wall should be built with bricks 120 meters thick as a retaining wall. The surface layer should be smeared with 1:2 cement mortar. The bottom of the pit should be hardened with C15 concrete. The pit wall should be located on the outside. , when constructing the base plate, the wall here can also serve as the outer formwork of the base plate.

3.2. Each drainage pit is equipped with one Φ50 water pump for drainage at any time, and four Φ100 mixed water pumps are equipped on site to prevent sudden heavy rains. Drainage ditches and sump pits are built with solid bricks, and 1:3 cement mortar is applied on the surface. A 0.3M slope is left on the upper part of the ditch and pit sides.

4. Earthwork backfilling

4.1. Because the site is too small to store soil, the backfilling earthwork must also be purchased from the construction site for backfilling.

4.2. Before backfilling the foundation, backfilling should be carried out after the foundation is completed and submitted to the owner, supervision and quality supervision departments for acceptance.

4.3. Before backfilling, all kinds of debris in the foundation pit should be removed, and the foundation pit should be dewatered to prevent the floor from floating and remove floating mud at the same time.

4.4. During construction, the soil should be spread in layers. The thickness of each layer should be between 200-250mm, and the soil should be compacted three times with an impact diesel tamping machine. During each pass of compaction and filling, samples should be taken to measure the dry bulk density of the soil according to regulations. The sampling range is once every 500 square meters/layer.

4.5. In order to ensure the compactness of the soil and obtain the maximum dry bulk density, a soil compaction test should be conducted on the backfill soil before backfilling in order to measure the optimal moisture content. The backfill soil should be mixed according to the measured optimal moisture content. When the moisture content is too high, spring soil will be formed during ramming: when the moisture content is too small, it is not suitable to compact. The compaction coefficient of the backfill soil should be above 0.94 to meet the requirements. Backfilling should be done evenly around the building.

3. Basic concrete structure

1. The foundation burial depth of this project is -2 meters, excluding the concrete cushion.

2. The foundation and column and beam formwork are all made of seven rubber plate formwork, supported by steel pipe scaffolding.

3. Calculation of formwork bearing capacity

3.1 Calculation of column formwork support (calculated based on the largest column section in this project)

3.1.1. Basics of column formwork Parameters

① The cross-section H and B of the column are 1900㎜, and two Ф12 pull bolts are provided along the direction B, with a spacing of 500㎜.

②The calculated height of the column formwork is L=1.9M

③The spacing between column hoops is D=0.2M

④The vertical ribs of the column formwork adopt a cross-section of 50 ×100㎜ wood square, spacing 0.2M.

⑤The column hoops are made of Ф48×3.5 steel pipes with a spacing of 500mm.

⑥The column hoop is the transverse support member of the column formwork. Its stress state is a bending member and should be calculated as a bending member.

3.1.2. Calculation of the standard value of column formwork load

The strength check must consider the pressure on the side of the newly poured concrete and the load generated when the concrete is poured, and the disturbance check only considers the side of the newly poured concrete. pressure.

Where γ=gravity density of concrete, take 24.00KN/M3

t—Initial setting time of newly poured concrete, when it is 0 (indicating no data), take 200/(T +15), which is 5.714h.

T—the molding temperature of concrete, which is 20℃.

V—Concrete pouring speed, taken as 2.0M/h.

H—The total height from the concrete side pressure calculation position to the top surface of the newly poured concrete, which is taken as 1.9M.

β1—Admixture influence coefficient, which is 1.0.

β2—Concrete slump affects the trimming coefficient, which is 1.15.

The standard value of the newly poured concrete side pressure calculated according to the formula F1=50KN/M2

According to F=γH, then F=24.00×1.9=45.6KN/M2

< p>The effective head height of concrete is: h=

Calculate the standard value of lateral pressure of newly poured concrete by taking the smaller value F1=50KN/M2

The load standard generated when pouring concrete Value F2=3.0KN/M2

3.1.3. Calculation of column formwork panels

The panels directly bear the load transmitted by the formwork and should be calculated according to the three-span continuous beam with uniform load. The calculation is as follows:

Plate strength calculation:

The calculation formula for the maximum bending moment of the support:

M=-0.10qd2

Mid-span Maximum bending moment calculation formula:

M2=0.08qd2

Where q—strength design load (KN/M)

q= (1.2×50.1.4 x3.00) The shrinkage position and size must meet the design requirements.

4. Beam steel bar binding

4.1. If in-mold binding is used. First, mark the stirrup spacing on the main beam formwork according to the drawing. Thread the stirrups on the main bars. Separate them one by one according to the marked spacing - fix the bent bars and main bars - bend the stirrups and main bars through the secondary beam and set the stirrups. Reinforcement - place the main beam to set up the vertical reinforcement, and the secondary beam to set up the vertical reinforcement - tie the main reinforcement and stirrups at the bottom of the beam at a certain distance - tie the vertical reinforcement - and then tie the main reinforcement. The primary and secondary beams are carried out simultaneously.

4.2. The overlap of stirrup hooks should be staggered and tied in the beam. For structures with earthquake resistance requirements, the stirrup hooks should be 135 degrees.

4.3. The locations of bending bars and negative bending moment steel bars must be prepared. At the intersection of beams and columns, the length of beam steel bars anchored into columns should meet the design requirements.

4.4. The distance between the end of the overlap length and the bend of the steel bar shall not be less than 10 times the diameter of the steel bar. The joint should not be located at the maximum bending moment of the member. The ends of the binding joints of Class I steel bars in the tension area should be hooked (Class II steel bars do not need to be curved hooks), and the overlapping joints should be firmly tied at the center and both ends.

4.5. The joint positions should be staggered from each other. Within the range of 30 times the diameter of the stressed steel bar (and not less than 500㎜), the cross-sectional area of ??the stressed steel bar with tied joints accounts for the total cross-sectional area of ??the stressed steel bar. The tension area shall not exceed 25%, and the compression area shall not exceed 50%.

IV. Foundation concrete project

1. This project uses commercial concrete.

2. The construction of this part must be carried out carefully in strict accordance with the technical requirements of concrete construction. Carry out hidden inspection, pre-inspection and acceptance of steel bars and formwork. It is necessary to check whether the lead wires and bolts that fix the formwork through the concrete wall have been taken as required. The wooden formwork should be watered and moistened in advance, and any debris falling inside the formwork should be cleaned up.

3. During the foundation construction, precipitation and drainage work should be done well to ensure that the groundwater should drop below 500㎜ at the bottom of the cushion and continue until the backfill is completed.

4. Transportation of concrete:

4.1. In order to ensure that no segregation occurs when concrete is poured, the concrete is dropped freely from a high place, and the falling distance should not exceed 2M. If the height exceeds 3M, it is necessary to use a skewer to fall into a chute to ensure that the concrete is dense. Generally, plug-in, flat-plate or attached vibrators are used. Use a plug-in vibrator, insert it quickly and pull it out slowly, and vibrate until the surface is slurry-free and free of bubbles. Vibration of concrete should be done quickly and slowly. The distance between the insertion points should not be greater than 50cm. The moving insertion points of the vibrator should be in the shape of a plum blossom. Each vibration range should overlap each other to prevent vibration leakage. The surface of the bottom plate should be vibrated with a flat vibrator to avoid vibrating for too long, causing the stones to sink. The structural sections are small and the parts with dense steel bars are strictly operated according to the principles of layered irrigation and layered vibration. Vibration and ash spreading should start from a symmetrical position to prevent the formwork from moving. When pouring to the surface layer, the concrete surface must be leveled and smoothed. After the concrete is vibrated, it is adjusted based on the horizontal control point of the floor thickness. Finally, it is scraped flat with a long scraper and roughened with a wooden mold.

4.2. Pumping concrete should be poured continuously. If the concrete supply is insufficient and the pumping is temporarily interrupted, the pump should be reversed every 10 minutes to make the concrete in the pipe move back and forth to maintain good pumpability. .

To prevent concrete from settling and clogging the pipes.

5. Maintenance

Concrete at room temperature must be covered with watering and curing within 4-6 hours after pouring. Water 4-6 times a day within 3 days, and water 2-3 times a day after 3 days. The curing time should be no less than 14 days. After the wall is watered for 3 days, pry the side formwork loose. It is advisable to water in the gap between the side formwork and the concrete surface to keep it moist.

5. Building axis and elevation control

1. For various projects carried out in the foundation pit, the positioning control point can be led sideways to the edge of the foundation pit to set up temporary axis control piles , Observe the installation position and axis of the cushion floor and wall panels, and promptly check the installation position of the axis and formwork on the gantry plate if there is any deviation.

2. The high-rise points and axis control points on site must be inspected by dedicated personnel every day. If any are lost or damaged, they must be detected and re-inspected in time, and re-marked on the plan plan.

3. When re-laying out, the pilot survey must be carried out by a dedicated person. Yang is responsible for the axis, elevation survey and lay-out in this project.

4. Before proceeding to the next process after earth excavation, cushion, floor slab, and foundation beam pouring, the axis and elevation must be reviewed, and the results must be reported to the supervision unit for review.

Chapter 7, Construction Safety Guarantee

Section 1, Safety Policy

The construction safety goals are: In order to conscientiously implement the city’s safe and civilized construction management methods, do We will carry out safe and civilized work at the proposed construction site, strengthen management, implement the policy of "safety first, prevention first", and specially formulate the following management goals:

1. There will be no safety accidents involving serious injuries or other serious injuries and other safety responsibilities at the construction site. ACCIDENT.

2. The frequency of minor injuries should be controlled above 0.24%.

3. This construction site creates a safe and civilized demonstration construction site.

4. Safety education for all employees is 100%, the management personnel certification rate is 100%, and the certification rate for special types of work is 100%.

5. There was no equipment damage accident, and the integrity rate of construction site equipment was 100%.

6. Ensure security at the construction site to prevent fires, thefts and fights.

7. Do a good job in canteen hygiene to prevent food poisoning and other accidents.

8. Do a good job of preventing heatstroke and cooling in summer, and preventing cold and heat preservation in winter.

Section 2 Safety Production Management System

The safety production management system consists of the safety production management organization, safety production responsibility system, safety production system and safety production network management.

For details, please refer to the "Project Safety Production Management System Framework Diagram"

Section 3 Specific Measures for Site Safety Production

1. Organize all workers before starting work Level, project level and company level three-level education. After passing the assessment, you must hold a certificate for hill work. You must wear a safety helmet correctly when entering the construction site.

2. A 1.2M high protective fence must be continuously installed on the side of the foundation pit on site, and workers entering the foundation pit must enter the site through the designated channel.

3. Enclosure and covering measures must be taken at reserved openings and construction joints to prevent falls.

4. Take measures to dewater and drain the foundation pit, and designate a dedicated person to check the support condition of the foundation pit wall, the drainage system and various protective facilities every day to ensure the safe progress of the construction.

5. On-site professional electricians must check on-site circuits and mechanical power consumption every day. Electrical protection appliances must maintain normal operation and perform routine maintenance to avoid electrical casualties.

6. During night construction of this project, there should be sufficient lighting. During the construction of the basic structure, three high-energy lamps will be arranged for comprehensive lighting.

7. Precautions for various types of work:

7.1. Safety measures for excavation of foundation pits

When using mechanical excavation, it should be from top to bottom and from the west. Carry out layer by layer in the east. Pay attention to changes in the soil wall during excavation. Non-mechanical workers are not allowed to enter the mechanical turning radius during mechanical excavation. If they must enter the mechanical operating area, contact the personnel on the machine. If necessary, the machine can be stopped before proceeding. During operation, maintenance is not allowed. Sufficient lighting must be provided during night construction. After large-scale mechanical excavation, trenches are dug manually. In order to prevent rainwater from flowing into the pit, a small berm is built at the upper entrance of the foundation pit, and two collection points are dug in the east and west of the foundation. Puddle well and have water pump ready. During foundation construction, you should check and pay regular attention to changes in soil quality and whether there is any cracking. Scaffolding should be set up when pouring columns, and various machinery should be placed at least 1m away from the edge of the pit to prevent slope collapse.

7.2. Safety precautions for electrician operations:

7.2.1. People with high blood pressure, heart disease, neuropathy, epilepsy, severe stuttering, and color blindness are strictly prohibited from engaging in electrical work.

7.2.2. Electricians must have a valid certificate of qualification for electrical work issued by the relevant department, be familiar with basic knowledge of electricity and electricians, be competent in electrical construction on site, and work with a certificate. Personnel without a certificate are strictly prohibited from working. Electricians can promptly handle on-site circuit faults.

7.2.3. Electricians must be proficient in emergency first aid methods for electric shock.

7.2.4. It is strictly prohibited to pull and close the isolating switch and drop-open fuse under load.

7.2.5. The electrical circuits at the construction site must be in good insulation condition, and measures must be taken to prevent people from stepping on them, being rolled over by cars, blistering, being buried in soil and being hit by objects.

7.2.6. For electrical equipment that is no longer in use, the wiring and equipment should be removed in time.

7.2.7. It is strictly prohibited to operate on the secondary circuit of the electric metering current transformer in the power supply department.

7.2.8. When an emergency occurs that seriously threatens the safety of people and equipment, the load switch can be opened by skipping the level, but under any circumstances, the isolating switch must not be opened with load.

7.2.9. The gate leakage protectors in the distribution box and switch box must be intact, and there must be no exposed live objects on the distribution panel.

7.3. Safety precautions for concrete engineering construction:

7.3.1. During construction operations, managers must stand aside and give instructions, and the operating procedures must be clear.

7.3.2. Before use, the concrete vibrator must be inspected by an electrician and confirmed to be qualified before use. A leakage protector must be installed in the switch box, the socket plug should be intact, and the power cord must not be broken or leaked during operation. The operator must wear insulating shoes and insulating gloves.

7.3.3. When working in a foundation pit, you should check whether the soil wall is cracked and whether there is warping. Only after confirmation can you start working. When working at heights, take safety protection according to the requirements for working at heights.

7.3.4. When pumping concrete, two people should be assigned to pull the hose. The pump pipe bracket should be reasonably set, stable and firm, and checked and corrected at any time. Concrete should not be piled up to prevent the formwork or bracket from being damaged. Safety incidents occur steadily.

7.3.5. Concrete must be poured from one end to the other, ensuring that the stacking thickness does not exceed 150MM.

7.4. Safety precautions for steel bar construction:

7.4.1. Before cold-drawing steel bars, the hoist wire rope, hook, cold-drawn clamps, electrical equipment, ground anchors and The protective device should be safe and secure, and can only be operated after confirmation. The stretch rate should be strictly controlled during cold drawing.

7.4.2. Operators must be trained, be familiar with mechanical performance, structure, and usage, master safety technical knowledge related to use, repair, and maintenance, and follow the instructions for cleaning, adjustment, tightening, and prevention. Rusty and lubricated machinery requires maintenance.

7.4.3. When there is a power outage during operation of the electric machinery, the power should be turned off immediately. When finishing work, the power should be cut off in sequence according to the power consumption regulations, and circuit faults should be eliminated by professional electricians.

7.4.4. A distribution box approved by the Tangshan City Safety Supervision Station must be used. The leakage protection device should be sensitive and reliable, and the leakage operating current should not be greater than 35mA.

Chapter 8, Civilized Construction Measures

1. Internal industry requirements for various materials and accounts (construction plans, safety education, safety disclosures, safety inspections, electrician daily inspection records, shift records (Pre-speech records, ledgers), etc. are complete and neat, and the records are realistic and realistic. Special operations must be carried out with certificates, and safety responsibilities are clearly divided.

2. Wear a safety helmet when entering the site, wear a seat belt when working at heights, the safety net is tightly supported in accordance with regulations, there are protective sheds at the entrance and exit, and there are safe passages in small sites.

3. Electrical equipment should be equipped with three levels of control and two levels of protection (main gate box, distribution box, switch box, and matching electric shock protectors in the distribution box and switch box). The gate boxes should be standardized and the lines should be standardized. There are records of electrician inspections and side shaking.

4. This project is equipped with colored calendered board walls with a height of not less than 2m, and civilized on-site construction management is carried out. There are clear publicity slogans on site and standard color signs hung at dangerous locations.

5. There are flat and clean passages on site that are not blocked or accumulated in water, and construction wastewater is properly discharged through drainage ditches.

6. Construction should be carried out in a civilized manner and do not disturb residents. Construction noise should be strictly controlled and construction should be stopped after 10 p.m.

7. Do not occupy roads in violation of regulations, do not set up or stack objects illegally, do not cause fires or traffic accidents, do not damage public facilities in violation of regulations, and do not pollute the environment and related roads inside and outside the site. Departments and health supervision departments should cooperate.

For reference