1, preparation before construction
(1) Level and clean up the construction site, excavate the drainage ditch, drill the pile hole, and put the pile frame into the site.
2, pile foundation engineering construction method
(1) Φ 377 static pressure vibroflotation cast-in-place pile is adopted for the pile foundation of this project. For detailed design and construction instructions, see the general situation of the project in the previous section.
(2) Before the formal construction of this project, we must do a good job of pile inspection in conjunction with quality supervision, supervision, design and other units, verify the geological report, determine the pile pressing force, determine the pile burial depth and its control method, determine the piling route, and carry out the construction in strict accordance with the determined terms, and shall not change it at will.
(3) Pile one by one in strict accordance with the requirements, and make a record of piling.
(4) Construction foundation and construction technology.
(1) According to the requirements of design drawings and specifications, the construction shall be strictly controlled, and the project layout and positioning shall be carried out in strict accordance with the planning drawings. Measurement, positioning and pile tip embedding must be correct.
(2) Before the construction of engineering piles, try to form piles near geological drilling holes, determine the pile frame counterweight, pile pressing force and pile strength, and do a good job in cement grading, strength, steel bar welding test and mechanical work. Quality supervision, design and construction units should send personnel to participate in pile testing. To determine the technical basis and control standards of the project construction. And as a pile test record, the construction shall be carried out after being approved by the responsible personnel of each unit.
③ For the piling sequence, see the piling construction sequence diagram.
(4) Each machine-team should make a set of concrete specimens. And properly protect it.
⑤ Construction technology: wrap the straw rope around the top of the pile tip → move the frame, align the formwork pipe with the pile tip, then correct both sides → sink the pipe (static pressure) → vibrate → lift it statically (or according to the elevation) → pour concrete → put it into the reinforcement cage → pour concrete twice → excite and pull out the pipe → stop exciting → circulate the main pile pipe to leave the ground naturally → check the elevation and quality of the pile top → continue the next process.
⑥ When drilling, the design depth must be reached. Before construction, soil should be taken well, and reference specimens of cement and soil should be prepared. Construction can only be started after the design requirements are met.
All landowners strictly mixing cement mixture ratio.
Today drilling mixing must be more than twice, at the same time drilling shotcrete. After meeting the design requirements, stop spraying concrete. (After spudding, it should be drilled and sprayed for the second time).
Pet-name ruby strictly grasp the drilling time.
(5) Technical measures for construction quality
① Anti-broken column; Strictly follow the piling sequence. For the engineering physique with thick silt soil layer, the jumping method shall not be used for construction. Time-controlled continuous construction shall be adopted. And external interference should be avoided as much as possible shortly after the pile is finally solidified.
② Prevention of necking: a) Strictly control the extubation time. Generally, the filling coefficient of concrete should be within 4m per minute to improve the compactness of concrete in the pile pipe. B) When pouring, correctly determine the concrete storage capacity of each pile. If the filling coefficient is greater than 1, take1.1-1.15. C) Mixing according to standard concrete slump.
③ Deviation prevention: After the pile tip is buried, it shall be carefully rechecked according to the axis and pile spacing, and the second row of piles shall be rechecked and proofread after the construction of the first row of piles is completed. Correct the deviation immediately when it is found, and pay attention to the verticality of pile pipe during construction.
(4) Prevent the pile pipe from entering water and the pile body from hanging (hanging); A) The pile tip contacts with the pile sleeve, and the straw rope is wound for three times. After sinking the pipe, check whether there is water in the pile house by listening to the sound after throwing. If water enters, you should unplug it and type again. B) Concrete shall be evenly mixed to achieve the specified slump and good workability.
⑤ In order to prevent pile dislocation, the effective length of pile body and the elevation of pile top should be controlled correctly.
⑥ Prevent segregation of pile-forming concrete: The concrete mixing time is not easy to be too long or too short. Extubation shock time is not easy to be too long or too short. The test tube must be stirred and stretched according to the specified processing time.
⑦ Ensure the quality of finished piles: a) Carry out construction in strict accordance with design requirements, specifications and technological processes. B) Mix ingredients in strict accordance with concrete grade. C) The quality of raw materials used for construction must be strictly controlled. Raw materials must have a quality guarantee.
(6) Construction safety measures
(1) popularize safety laws and regulations and safety knowledge, check safety facilities and safe operation during construction, and immediately stop and correct hidden dangers when found.
(2) You must wear safety helmet when entering the construction site. For aerial work above three meters, you must fasten your seat belt, fasten your safety buckle and wear non-slip shoes. No drunken homework, no throwing tools and materials.
(3) Mechanical equipment shall be operated by special personnel. Operators, welders and other special operations personnel must hold relevant certificates.
(4) Mechanical equipment assembly must be tested first. Production (construction) can only be started after normal operation.
⑤ Electrical equipment must be grounded to zero. Special plane brake and distribution box must be equipped with corresponding leakage protectors and fuses, and electric furnaces are strictly prohibited in the workshop.
⑥ The construction sites are all old places. Pine should be leveled and pile chassis should be stable during construction. For low-lying sites, drainage should be done in time.
(7) time limit for a project guarantee measures
(1) Learn advanced experience, organize scientific construction, summarize the company's previous rapid construction experience, vigorously promote advanced and applicable technologies, and aspire to achieve new speed in this project.
(2) Carefully organize project construction technicians. The backbone of the team is familiar with the construction drawings, carefully prepare the construction organization design of partial projects, and design and construct in strict accordance with the approved construction organization.
(3) Strengthen the strength of the construction team, carry out labor competition, and the site construction is always responsible for the coordination of site contact.
(4) Give full play to the enthusiasm of workers, strengthen the technical strength of major projects, and impose heavy rewards and penalties according to the parts to encourage employees to work hard.
⑤ Put enough mechanical equipment, personnel, steel bars and other turnover materials into the site in advance.
6. High-speed construction must attach importance to cement, steel and other building materials. Once winning the bid, the company will make a good supply plan first, and actively do a good job in purchasing and ordering materials to ensure that there is no shortage of materials.
⑦ Party A and Party B cooperate closely to coordinate the work of each project, and the management of the company sends full-time personnel to supervise and put forward reasonable suggestions and implementation methods.
(8) Civilized construction measures
Overview of the construction scheme of static pressure vibroflotation cast-in-place pile foundation project: According to the design drawings and specifications, the construction of the project is strictly controlled according to the design specifications, and the plane layout and positioning of the project must be strictly implemented according to the planning drawings. Measurement, positioning and pile tip embedding must be correct.
Download from the property management information > do civilized construction, abide by the construction operation norms and the rules and regulations of the construction unit, as well as the relevant provisions of social security management. Educate employees to conscientiously implement the "Ten No's" norms in Ningbo and strive to be civilized citizens.
① Hygiene
A. All temporary houses and workshops on the construction site shall be subject to hygiene contract system. Each building 1 shall choose a hygiene representative and each household shall choose a hygiene executor to ensure the cleanliness of temporary houses and workshops.
B. build toilets on the construction site and clean them by special personnel three times a day.
C. The construction site shall be cleaned by designated personnel and cleaned in time.
D. Materials shall be piled up in a planned way to ensure the roads are clean and smooth.
E. All wastes and garbage on the construction site must be removed through appropriate channels, which will not affect the city appearance.
② Public safety
A. the construction site should be equipped with special security personnel.
B. All foreigners on the construction site must have ID cards and work permits, and apply for temporary residence permits in time. Couples must have a marriage certificate, and those with bad conduct should not be used.
C. Regularly post stickers, play recordings and publish newspapers to publicize public order.
D. A fire extinguisher is equipped on site.
E. strictly control family planning and resolutely implement relevant state laws and regulations.
③ canteen system
A. canteen staff must hold health certificates and have health awareness.
B. Take fire prevention measures in the canteen.
C. On-site personnel must eat and cook when dining, and electric furnaces are strictly prohibited.
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