Slogan of section steel house

Construction scheme of independent foundation of steel structure

The first chapter, preparation instructions.

I. Basis for compilation

1, the current national code for construction quality acceptance of construction and installation projects.

2. Code for Acceptance of Construction Quality of Building Foundation Engineering (GB50202——2002)

3. Code for Quality Acceptance of Masonry Engineering (GB 50203—2002)

4. Code for Acceptance of Construction Quality of Concrete Structure Engineering (GB 50204—2002)

5. Code for Acceptance of Construction Quality of Building Water Supply, Drainage and Heating Engineering (GB50242—2002)

6. Code for Acceptance of Construction Quality of Building Electrical Engineering (GB 50303—2002)

7. Code for Acceptance of Construction Quality of Steel Structure Engineering (GB50205——200 1)

8. Test method standard for welded joints of steel bars (JGJ/T-200 1)

9. Code for Quality Acceptance of Building Decoration Engineering (GB5020 1-200 1)

10, design and construction drawing compilation, construction and water and electricity installation project of Nanhu Hotel dormitory building project.

Chapter II, Project Overview

General situation of architecture

This project is the dormitory building project of Nanhu Hotel, with a total construction area of about 3 176.08 square meters. The main structure is a four-story steel frame structure with a total cornice height of15.450m.. The fire resistance rating is Grade II, 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 made of Q235B steel, the floor and roof are profiled steel plate concrete non-composite floors, the maintenance structure is 200mm thick aerated concrete blocks, and the inner wall is 150mm thick ALC stiffened concrete slabs.

Chapter III Preparation for Construction

Section 1, Site Preparation

1, with emphasis on putright, recheck and relevant handover procedures for plane control points and leveling control points handed over by the owner.

2. Preparation of temporary facilities: mainly including offices, duty rooms, power distribution rooms, cement depots, fences, roads, tool rooms, gates, steel processing sheds, formwork processing sheds, toilets, etc. Living quarters mainly include office buildings, staff quarters, canteens, bathrooms, etc.

3. Site preparation: According to the relevant regulations of Tangshan City, a drainage system will be set up in the site, and all rainwater and sewage in the site will be discharged into the road rainwater and sewage pipe network in an organized way through the drainage pipe.

4. Preparation of water and electricity for construction: The construction unit has provided 400KVA transformer and DN50 water source, and the main work includes the layout of hydropower lines and the laying of water inlet and outlet pipes in the construction area and living area.

Section II, Technical Preparation

1. Before construction, all relevant information such as safe and civilized construction scheme and site general plan shall be reported to the Municipal Construction Management Bureau, safety supervision station, construction and supervision for examination and approval in time, and shall be implemented according to the examination and approval opinions.

2, organize the professional foreman, team leader, technician carefully read the drawings, to participate in the blue prints.the design, familiar with the design intent and related details. Set out and calculate all kinds of steel bars and templates. Determine the geometric parameters required for construction survey. Make a test plan and make a specific collocation.

3, according to the content of each sub-division, subdivisional work, calculate the quantity, do a good job of quantity analysis, and prepare the construction plan accordingly.

Section III, Material Preparation

1. According to the progress requirements of each period, analyze the material requirements, make statistical summary on the name, specifications, use time and quantity of materials, make purchasing plans, determine the stacking and storage locations, and organize transportation.

2. All required materials should be reported three days in advance for timely purchase.

Section 4 Personnel Organization

Chapter IV Construction Process and Progress

1, construction process:

Positioning and setting-out machinery excavation earthwork cushion constructional column and wall construction foundation beam construction masonry foundation division acceptance foundation earthwork backfilling steel structure construction floor construction masonry, partition wall construction water supply and drainage construction electrical construction decoration construction self-inspection, rectification completion acceptance.

2. Construction arrangement:

2. 1. According to the preliminary site positioning observation, 1: 0.75 is adopted for slope excavation.

2.2. See the attached figure for the time limit for a project and the schedule of each subdivisional work.

The fifth chapter, the main component project construction scheme

The first section, foundation construction

A, building axis positioning:

1. 1, location point basis: locate the construction site according to the three location points 0 1, 02 and 04 provided by the surveying and mapping department.

1.2, measuring and positioning tools:

1.2. 1.J2 theodolite is used to locate the peripheral axis of the building.

1.2.2, and the elevation putright is carried out with N2 level.

1.2.3. Auxiliary tools: wooden stakes, reinforced piles, 50M steel rule, cotton thread, nails, red paint, etc.

1.2.4, the on-site theodolite frame is at 1 point, and the theodolite lens is closed at 2 o'clock on the upper east side and rotated by 900. For the four points provided by the upper southwest surveying and mapping unit, the closure meets the requirements. Then put the theodolite at 4 o'clock, rotate it by 900 at the point where the lens is aimed at 1, measure 6 1.04M on the B axis with a steel tape, and determine the point where the B axis intersects with 1 1, and then put the theodolite at the point where the B axis intersects with 1. Rotate the lens by 900 to two points, and then measure 1 3.12m from the intersection of1axis and B axis with a steel tape, and confirm that the two-point closure provided by the Bureau of Surveying and Mapping meets the requirements of construction survey.

1.3, according to the known axis points and control points, you can use theodolite and steel rule to lay out the relevant axis positions for positioning.

Second, the earthwork excavation and backfill engineering

1, Geological Survey

According to the geological survey report, the foundation soil of this project is good, and the independent foundation is located in the 03rd clay layer, with FAK = above 260 kPa. It can be seen from the geological survey report that the groundwater level of this project is low and there is less groundwater. No corrosiveness to foundation concrete.

2, earthwork excavation

2. 1. Before the construction of this project, you should read the drawings carefully and be familiar with the actual situation of the site and the difference between the actual elevation and the design elevation. Understand the design depth of the foundation of this project. Before earthwork excavation, check the difference between the design axis and the actual axis, and then proceed to the next working procedure after meeting the design requirements.

2.2. When excavating the foundation trench, if the soil layer is found to be inconsistent with the geological report, or if there are abnormal conditions such as grave wells, dry wells and weak soil layers of civil air defense fortifications, it shall immediately notify the personnel of the construction unit, geological survey department, design institute and other relevant departments to study and solve them on the spot. All earthwork excavated in this project will be transported out of the site.

2.3, mechanical excavation, must be layered, segmented, appoint someone to command. The earthwork excavation starts from the intersection of axis ○ 1 and axis C, and advances to axis ○2.

2.4. During earthwork excavation, assign personnel to control the elevation, track and measure, and beware of overbreak. The reserved earthwork thickness at the bottom of the pit is controlled at 100㎜. When the thickness is different and the area is small, leveling treatment is not needed to prevent disturbing the foundation soil.

3, earthwork excavation dewatering and drainage

3. 1, compiled according to the precipitation measures in the geological survey report. The underground water level of this project is low, and a large amount of underground water will not be encountered during foundation earthwork excavation. However, considering the rainy weather during foundation construction, it is still necessary to do a good job in dewatering and drainage system for earthwork excavation. Drains of 05M×0.7M are mainly arranged around the foundation pit, and a sump of 0.8M×0.8M× 1.0M is set at each corner. During construction, this part of earthwork shall be excavated first, and the pit wall shall be 120 thick brick, and the surface layer shall be plastered with 65438.

3.2. Each drainage pit is equipped with a φ 50 water pump for drainage at any time, and the site is equipped with four φ 100 mixed water pumps to prevent sudden rainstorm. The drainage ditch and sump pit are all built with solid bricks, and the surface is 1: 3 cement mortar, with a slope of 0.3M at the upper part of the ditch pit.

4, earthwork backfill

4. 1, because the site is too small to store soil, the backfill earthwork must also be outsourced to the construction site for backfilling.

4.2 Before foundation backfilling, backfilling shall be carried out after the foundation is completed and accepted by the owner, supervision department and quality supervision department.

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

4.4 During construction, soil shall be spread in layers, with the thickness of each layer being 200-250㎜, and compacted with impact diesel rammer for three times. During each compaction, the dry bulk density of soil shall be measured by sampling according to regulations, and the sampling range shall be once every 500 m2/ layer.

4.5. In order to ensure the compactness of soil and obtain the maximum dry bulk density, compaction test should be carried out on backfill soil before backfilling to determine the optimal water content. Backfill soil should be mixed according to the determined optimum water content. When the water content is too high, spring soil will be produced during tamping; When the water content is too low, it is not suitable for compaction, and the compaction coefficient of backfill soil should be above 0.94 to meet the requirements. Pay attention to backfill evenly around the building.

Third, the foundation concrete structure

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

2, foundation, column beam template using seven layers of rubber template, steel pipe and scaffolding support.

3, template bearing capacity calculation

3. 1 column formwork support calculation (calculated according to the maximum column section of this project)

3. 1. 1, basic parameters of column formwork

(1) column section h, B= 1900㎜, set Ф12 opposite bolts along the direction b, with a spacing of 500㎜.

(2) The calculated height of column formwork is l =1.9m.

③ column hoop spacing d = 0.2m.

(4) column template vertical stare blankly with a cross section of 50 x100 ㎜ (spacing of 0.2M ..

(5) The column hoop is made of Ф 48× 3.5 steel pipes with a spacing of 500㎜.

⑥ Column hoop is the transverse supporting member of column formwork, and its stress state is flexural member, which should be calculated as flexural member.

3. 1.2, column template load standard value calculation

The lateral pressure of newly poured concrete and the load generated when pouring concrete should be considered in strength checking calculation, and only the lateral pressure of newly poured concrete should be considered in disturbance checking calculation.

Where γ = gravity density of concrete, taking 24.00 kn /M3.

T—— Initial setting time of fresh concrete, when it is 0 (indicating no data), take 200/(T+ 15), that is, 5.7 14h.

T—— the temperature of concrete when it enters the mould, which is 20℃.

V- concrete pouring speed, 2.0m/h

H —— the total height from the calculation position of concrete lateral pressure to the top surface of newly poured concrete, which is1.9m.

β 1 —— the influence coefficient of additives, which is 1.0.

β2- correction coefficient of concrete slump, take 1. 15.

According to the formula, the standard value of lateral pressure of fresh concrete is F 1=50KN/M2.

If F=γH, then F=24.00× 1.9=45.6KN/M2.

The effective head height of concrete is: h=

According to the minimum value, calculate the standard value of lateral pressure of fresh concrete F 1=50KN/M2.

When pouring concrete, the standard load F2=3.0KN/M2.

3. 1.3, template panel calculation

The panel directly bears the load transmitted by the formwork, and should be calculated as a three-span continuous beam with uniformly distributed load, and the calculation is as follows:

Plate strength calculation:

Calculation formula of maximum bending moment of bearing:

M=-0. 10qd2

Calculation formula of maximum bending distance in midspan:

M2=0.08qd2

Where q- strength design load (KN/M)

Q = (1.2× 50.0+1.4× 3.00 )× 0.5 = 32.1kn/m.

D —— vertical spacing, d=200.

When the section size changes and the column section size changes, the shrinkage position and size of column reinforcement should meet the design requirements.

4, beam steel binding

4. 1, if in-mold binding is adopted. Firstly, draw the stirrup spacing on the main girder formwork according to the drawing, put on the main reinforcement, and separate them one by one according to the drawn spacing-fix the bent reinforcement and the main reinforcement-put the bent reinforcement and the main reinforcement into the secondary beam and put on the stirrup-put on the main girder and the secondary beam to erect the stirrup-tie the main reinforcement and the stirrup at the bottom of the beam at a certain distance-tie the erected reinforcement-and then tie the main reinforcement. The main beam and the secondary beam are coordinated simultaneously.

4.2, stirrup hook overlap, should be staggered in the beam binding, structure with seismic requirements, stirrup hook for 135 degrees.

4.3, bending reinforced and negative bending moment reinforced position to be ready, beam and column junction, beam reinforced anchorage length in the column should comply with the design requirements.

4.4. The distance between the end of the lap 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. In the tension zone, the end of the binding joint of class I steel bar should be hooked (class II steel bar can't be hooked), and the lap joint should be fastened at the center and both ends.

4.5, joint position should be staggered, within the scope of 30 times the diameter of the reinforced section (and not less than 500㎜), the reinforced section area with binding joint accounts for 25% of the total reinforced section area in tension area and 50% of the total reinforced section area in compression area.

Fourth, the foundation concrete engineering

1, this project adopts commercial concrete.

2, this part of the construction should be carefully constructed in strict accordance with the technical requirements of concrete construction. Do a good job of concealed inspection, preview and acceptance of steel bars and templates. Attention should be paid to check whether the lead wires and bolts of the fixed formwork pass through the concrete wall as required. Wooden formwork should be watered and wetted in advance, and sundries falling in the formwork should be cleaned up.

3. During foundation construction, do a good job of dewatering and drainage to ensure that the groundwater drops below 500㎜ at the bottom of the cushion, and continue until the backfilling is completed.

4, concrete transportation:

4. 1, in order to ensure that concrete pouring does not produce segregation, concrete falls freely from a height, and its falling distance should not exceed 2M. When the height is more than 3M, it is necessary to use the chute with a string of drums to fall down to ensure the concrete is dense. Generally, plug-in, flat-plate or attached vibrators are used. Use plug-in vibrator, insert quickly and pull slowly, and vibrate until there are no bubbles on the surface. The vibrating of concrete should be inserted quickly and pulled slowly, and the spacing between insertion points should not be greater than 50㎝. The moving insertion point of vibrator should be quincunx, and the vibration range should overlap each other to prevent vibration leakage. The surface of the bottom plate shall be vibrated by a flat vibrator to avoid the stones from sinking due to too long vibration time. The parts with small structural section and dense steel bars should be operated in strict accordance with the principle of layered watering and layered vibrating. Vibrating and plastering should start from symmetrical positions to prevent the formwork from moving. When pouring to the surface, the concrete surface must be leveled and plastered firmly. After the concrete is vibrated, it will be adjusted according to the horizontal control points of the floor thickness. Finally, it will be leveled with a long ruler and roughed with a wooden model.

4.2, pumping concrete should be continuous pouring, such as concrete supply temporarily interrupted pumping, should be pumped once every 65438+/-00 min, make the concrete form reciprocating motion in the tube, maintain good pumpability. In order to avoid concrete precipitation blocking the pipeline.

5. Maintenance

After concrete is poured at room temperature, it must be watered for curing within 4-6h, 4-6 times a day within 3d, and 2-3 times a day after 3d, and the curing time shall not be less than 14d. After the wall is poured for 3 days, pry the side formwork loose, and water the gap between the side formwork and the concrete surface to keep it moist.

Five, building axis, elevation control

1 For the contents of various projects carried out in the foundation pit, temporary axis control piles can be set from the front of the positioning control point to the edge of the foundation pit to observe the installation position and axis of the cushion bottom plate and wallboard. If there is any deviation, the installation position of the shaft and template on the portal frame plate can be checked in time.

2, the scene of the high point, axis control points must be checked every day, with or without loss, damage must be timely putright recheck, and marked in the plan.

3, pay-off, putright must be carried out by specialist, the axis of the project, elevation putright, determined by Yang.

4, after the earthwork excavation construction, cushion, bottom plate, foundation beam casting before the next process, must review the axis and elevation, and report the results to the supervision unit for review.

Chapter VII, Construction Safety Assurance

The first section, security policy

The construction safety objectives are as follows: In order to conscientiously implement the municipal management measures for safe and civilized construction, do a good job in the safety and civilized work of the proposed construction site, strengthen management, and implement the policy of "safety first, prevention first", the following management objectives are formulated:

1, there are no serious injuries and other safety accidents on the construction site.

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

3. This site is a demonstration site of safety civilization.

4. The coverage rate of safety education for all employees 100%, the certified rate of managers 100%, and the certified rate of special types of work 100%.

5. There is no equipment damage accident, and the on-site equipment integrity rate is 100%.

6, to do a good job in the construction site security, no fire, theft and fighting accidents.

7, do a good job in the canteen hygiene, put an end to food accidents such as du.

8, do a good job in summer heatstroke prevention and cooling, winter cold insulation.

Section 2 Safety Production Management System

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

See the project safety production management system framework for details.

Section III Specific Measures for Site Safety Production

1. Before starting work, all operators should receive three levels of education: group level, project level and company level. After passing the examination, you must hold relevant certificates and wear safety helmet correctly when entering the construction site.

2. A fence with a height of 1.2M must be continuously set at the edge of the foundation pit on site, and workers entering the foundation pit must enter the site from the designated channel.

3, the reserved hole in the construction, construction joint enclosure, cover-up measures must be taken to prevent falling.

4, completes the drainage measures of foundation pit, appoint someone to check the supporting situation of foundation pit wall, drainage system and various protective facilities every day to ensure construction safety.

5. On-site professional electricians must check the electricity consumption of on-site circuits and machinery every day, and the electrical protection appliances must maintain normal operation and do a good job in daily maintenance to avoid electrical casualties.

6, the project construction at night, should have enough lighting. In infrastructure construction, three high-energy lamps are arranged for comprehensive lighting.

7. Precautions for each type of work:

7. 1, safety measures for earthwork excavation of foundation pit

When mechanical excavation is adopted, it should be carried out from top to bottom and from west to east layer by layer. Pay attention to the change of soil wall during excavation. During mechanical excavation, non-mechanical workers are not allowed to enter the mechanical rotation radius. If a mechanical operation area is needed, contact the personnel on board and stop if necessary. During the operation of the machine, maintenance is not allowed. There must be sufficient lighting during construction at night. After mechanical excavation, manual excavation is adopted. In order to prevent rainwater from flowing into the pit, a small berm was built at the upper mouth of the foundation pit. During foundation construction, check and pay attention to the change of soil quality and whether there is cracking. Scaffolding should be erected when pouring columns, and all kinds of machinery should be placed above the pit edge 1M to avoid slope collapse.

7.2, electrician operation safety precautions:

7.2. 1. People with hypertension, heart disease, neuropathy, epilepsy, severe stuttering and color blindness are prohibited from engaging in electrical work.

7.2.2, electrician must hold a valid electrician operation certificate issued by the relevant departments, familiar with the basic knowledge of electrician, the site can be competent for the construction of electricity, show certificates, it is forbidden to unlicensed personnel mount guard. Electricians can deal with field circuit faults in time.

7.2.3. Electricians must be familiar with emergency rescue methods for electric shock.

7.2.4. It is forbidden to close the isolating switch and open the fuse with load.

7.2.5. The electrical lines on the construction site must be kept in a good insulation state, and measures should be taken to prevent people from stepping on, grinding, blisters, burying and breaking.

7.2.6 For electrical equipment that is not used, take out stitches and dismantle it in time.

7.2.7. It is strictly forbidden to use electricity to measure the secondary circuit of current transformer in the power supply department.

7.2.8 In case of emergency that seriously threatens personal and equipment safety, the load switch can be disconnected, but under no circumstances can the disconnector be disconnected with load.

7.2.9 The leakage protector in the distribution box and switch box must be intact, and there shall be no exposed charged body on the distribution box.

7.3, concrete engineering construction safety precautions:

7.3. 1. During construction, management personnel must be on the side with clear manual operation.

7.3.2 Before use, the concrete vibrator must be checked and confirmed by the electrician before use. Leakage protector must be installed in the switch box, and the socket plug should be intact. The power cord must not be broken or leaked. Operators must wear insulating shoes and gloves.

7.3.3 When working in the foundation pit, check whether the earth wall is cracked or warped, and the operation can be carried out only after it is confirmed. When working at heights, do a good job of safety protection according to the requirements of working at heights.

7.3.4. When pumping concrete, two people should be set to pull the hose. Pump pipe bracket should be set reasonably, stably and firmly, and should be checked and corrected at any time. Concrete shall not be piled up in piles to prevent formwork or support from being unstable and causing safety accidents.

7.3.5, pouring concrete must be poured from one end to the other, to ensure that the accumulation thickness does not exceed150 mm. ..

7.4, steel structure construction safety precautions:

7.4. 1 Before the cold-drawing operation of steel bar, it is necessary to check that the winch wire rope, hook, cold-drawing fixture, electrical equipment, ground anchor and protective device are safe and reliable, and the operation can be carried out only after it is confirmed, and the elongation rate should be strictly controlled during cold-drawing.

7.4.2. Operators should be trained, familiar with the mechanical performance, structure and use, master the safety technical knowledge of use, repair and maintenance, and repair and maintain the machinery according to the requirements of cleanliness, adjustment, fastening, rust prevention and smoothness.

7.4.3 In case of power failure during motor operation, the power supply shall be cut off immediately. When the work is over, the power supply should be cut off in turn according to the electricity consumption specification, and the circuit fault should be eliminated by a professional electrician.

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

Chapter VIII, Civilized Construction Measures

1, the industry requires all information and accounting (construction plan, safety education, safety disclosure, safety inspection, electrician's day patrol record, pre-shift speech record, accounting) to be complete and tidy, practical and realistic, hold relevant certificates for special operations, and have a clear division of safety responsibilities.

2. Wear a safety helmet when entering the site, wear a safety belt when working high above the ground, support a safety net according to regulations, have a protective shed at the entrance and exit, and have a safe passage in a narrow space.

3. Electrical equipment (main brake box, distribution box, switch box, electric shock protector in distribution box and switch box) shall be provided with three-level control and two-level protection. The brake box should be standardized, the line should be standardized, and the electrician's patrol and roll record should be recorded.

4. In this project, a colored calendered board fence with a height of not less than 2m is set up to carry out on-site civilized construction management. There are obvious propaganda slogans at the scene, and color codes that meet the standards are hung at dangerous places.

5. There is a flat and clean channel at the site, without blockage and water accumulation, and the construction wastewater is reasonably discharged into the drainage ditch.

6, civilized construction is not a nuisance, strictly control the construction noise, stop construction after 10.

7. Do not occupy roads illegally inside and outside the site, build or stack things illegally, cause fire and traffic accidents, damage public facilities illegally and pollute the environment, and cooperate with relevant road departments and health supervision departments.

FYI