Quality assurance measures for campus deep foundation pit projects are very important. The most important thing in project construction is quality. Every detail must be handled according to actual conditions to achieve the best. Zhongda Consulting would like to explain to you the quality assurance measures for the deep foundation pit project in the campus.

1. Organizational measures

1. Quality assurance system: Our company has passed ISO9001 quality system management certification. During the implementation of this project, the project department will be established in strict accordance with the requirements of the quality management system. , strengthen quality management, standardize management work procedures, and improve work quality. Ensure that project quality management objectives are achieved.

Quality management network: Company Engineering Department → Project Department Quality Officer → Production Team Quality Officer. Please see the project management organization chart for specific management personnel diagram.

2. Management objectives: comply with the current national engineering construction quality acceptance assessment standards and the design standards of this project.

3. Management responsibilities: The most important thing in the construction quality management organization system is quality management responsibilities. The responsibilities are clear, the responsibilities can be put in place, and it is easy to manage.

a. Quality responsibilities of the project manager:

As the top leader of the project, the project manager should be fully responsible for the quality of the entire project and balance the schedule while ensuring quality. , the completion of various indicators such as economic benefits, and urge all project managers to establish the concept of quality first to ensure the implementation and implementation of the "Quality Assurance Plan".

b. Quality responsibilities of the project technical leader:

As the executor of project quality control and management, the project technical leader should comprehensively manage the quality work of the entire project, starting from quality assurance The project technical leader is responsible for everything from the preparation of the plan to the setup and operation of the quality assurance system. At the same time, as the project technical leader, he should organize the preparation of various plans, work instructions, construction organization design, review the construction plans provided by subcontractors, etc., host quality analysis meetings, and supervise the implementation of the quality responsibilities of each construction management personnel.

c. Quality Responsibilities of Quality Inspection Personnel

As the main personnel for comprehensive inspection of project quality, quality inspection personnel have considerable construction experience and hard-working spirit. During quality inspection Have considerable foresight in the process, provide accurate and complete inspection data, promptly issue rectification notices for quality hazards that arise, supervise rectifications to meet corresponding quality requirements, and have the ability to independently handle existing quality problems.

d. Quality responsibilities of construction workers

As the direct commander of the construction site, construction workers should first establish the concept of quality first, and monitor the work at any time during the construction process. The team conducts quality inspections and points out at any time the irregular operations of the work team and the construction content that does not meet the quality requirements, and urges rectification. The construction workers are also the main preparers of each sub-item construction plan and work instructions, and should do a good job in technical explanations.

4. Construction quality management system

The establishment and operation of the construction quality management system must be centered around quality management responsibilities and quality control. Only when the responsibilities are clear and the control is strict Only in this way can the quality management system be implemented effectively. During the management process of this project, these two aspects will be strictly controlled.

4. Management system:

a Three-level acceptance system: Implement the three-level quality acceptance system established by the company, with special emphasis on team self-inspection and mutual inspection. Each process must be constructed in strict accordance with operating procedures and quality requirements. Whoever does the job well is responsible for the quality of the construction.

b Process handover system: Do a good job in quality supervision and handover between each process. Only after the previous process has passed the quality acceptance can the next process be carried out. The previous process must be responsible for the next process. Responsible for the process.

c Strictly carry out the construction and setting-out work, position the project well, control the axis elevation, carefully check the measuring instruments and steel rulers before construction, and conduct construction only if they meet the specified requirements, determine the setting-out and measurement plans, and Full-time technical personnel shall be responsible for the measurement work, and the main axes and elevations shall be reviewed by the on-site construction workers. This technical review work shall be emphasized to be implemented seriously and a written record of the construction technical review shall be filled in.

d Material quality management: All construction materials entering the site must undergo strict quality inspection and have quality assurance certificates such as warranty certificates, retest orders, and certificates of conformity. The quality of materials is checked by the construction site material clerk and purchaser. Supervision by the on-site technical person in charge.

2. Specific technical measures

(1) Technical measures

1. Before excavation of the foundation pit, all obstacles in the site must be cleared.

2. Before excavation, the stakeout should be set out correctly, and the positioning measurement review procedures should be completed. The axis control pile should be led out of the excavation ground, and protective measures should be taken to control the elevation and axis at any time during excavation. Excavate correctly.

3. Before excavation, ground drainage ditches and water collection wells should be improved.

4. The base elevation of earth excavation shall be carried out in conjunction with the basement structure drawing.

5. Before excavation of the foundation pit project, a site survey and repairs should be carried out, mainly to identify the types, distribution and depth of shallow obstacles in the foundation, the distribution of pipe networks inside and outside the site, and the distribution of pipe networks buried in the foundation pit. Pipelines within the scope should be removed in time to ensure the normal use of pipeline facilities and the sequence of foundation pit construction.

6. Vehicles should follow the prescribed route and avoid being run over by heavy-duty vehicles along the edge of the foundation pit.

7. The excavator must be operated with extreme caution. Manual excavation is used around the columns. It is strictly forbidden for the bucket to hit the supports and columns. Especially for night excavation construction, special personnel must be in charge and it is strictly prohibited to pull the supports.

8. During the excavation process, the status of the trench wall and slope should be checked at any time. Corresponding measures should be taken promptly based on the monitoring hole data to prevent collapse.

9. The earth excavated by the excavator should be transported outside in a timely manner by earthmoving trucks. The earth should not be piled on the top of the foundation pit slope to avoid safety accidents such as pit wall collapse.

10. When digging, dig as far as possible to the design elevation, and use manual labor to level the bottom edge as you dig. Elevation measurements must be carried out at any time to prevent over-excavation. Once the excavation is too deep, it must be filled with gravel, and backfilling with original soil is strictly prohibited. In order to ensure the effective control of the elevation of manually excavated soil, the method of setting bamboo piles at the bottom of the pit is adopted, and the vertical and horizontal spacing of the elevation should be controlled to 3.0-5.0m.

11. Remove adjacent construction materials and accumulated soil around the foundation pit so that the load is less than 15KPa. It is strictly prohibited to pile accumulated soil on the containment roof beam.

12. Make safety guardrails around the foundation pit. A 1.5-meter fence with black and yellow two-color steel pipes is set up next to the foundation pit. The distance between the poles is no more than 3 meters, and eye-catching signs are hung. Escalators are set up up and down the foundation pit, and 1.5-meter-wide steel pipe escalators are set up with handrails. The slope is no more than 35 degrees.

13. When mechanical excavation reaches the base, personnel and excavators will be deployed to excavate the earth such as the cap platform and ground beams to a height of 50 cm above the designed base. According to the construction progress of the cushion and pile digging To determine the progress of 50 cm of manual soil repair.

14. In order to prevent the base from being exposed to natural influences for too long, we adopt the method of excavation in layers and constructing concrete cushion layers in sections. To this end, sufficient labor force for manual soil clearing and slope repair is equipped with mechanical shovels. Wherever the machine digs, the soil is cleared and slope repair is carried out, and the concrete cushion is constructed wherever the machine digs. Strengthen contact with construction units, project supervision, design units, and survey units, and conduct foundation pit inspections in a timely manner.

15. When the soil is artificially repaired to the design elevation and local over-excavation occurs, use reasonable sand and gravel grading to back the cushion.

16. After the excavation and treatment of the foundation pit are completed, after the relevant personnel have inspected and confirmed the soil quality and elevation of the foundation pit, the concealed acceptance procedures shall be completed in a timely manner. Carry out foundation cushion construction in a timely manner.

17. In order to prevent water accumulation in the foundation pit, open drainage ditches are set up around the inner edge of the foundation pit, with a width of 300 × a depth of 400. There are four water collection wells at the four corners and one in the middle. In order to prevent running water from scouring the ditch walls and ensure smooth drainage, the ditch walls and bottom are built with single bricks and plastered with cement mortar. Use a water pump to pump water when necessary, and assign a dedicated person to check the pumping water to ensure that there is no accumulation of water in the foundation pit. If any abnormality is encountered, immediately notify relevant personnel to organize handling.

18. Precautions for construction during flood and rainy seasons: When earth excavation is carried out in the rainy season, the working surface should not be too large and should be completed in stages. Attention should be paid to slope stability. Frequently inspect slopes, supports, and earth embankments, and deal with problems in a timely manner (if cracks are found on the surface around the foundation pit, they can be sealed with grouting in time to prevent surface water from infiltrating).

19. Before excavation of the basement foundation pit, the strength of the foundation pit enclosure concrete must reach the design strength before excavation.

(2) Excavation construction operation requirements

*1 A backhoe excavator is used for layered excavation, and the earth-moving vehicle is arranged on one side of the backhoe to reduce the rotation angle. Improve productivity.

The earthwork excavation for this project is divided into two stages. An 8%-10% ramp will be built in the middle of the second construction section to serve as an entry and exit channel for machinery and earth-moving vehicles. The excavated earth is transported to the spoil site for stacking, and finally the slope is excavated. Some soil should be left in the relatively open areas of the site for backfilling of the foundation pit to reduce secondary transportation of earth.

The tolerance for slope repair is limited to centimeters.

*4 When excavators and earth-moving trucks enter and exit the foundation pit transportation roads, they should try to use several foundation pits on one side of the foundation to excavate underground transportation channels to reduce the amount of soil excavated.

(3) Quality standards

1. Main control items

The soil quality of the base plate, cap platform and ground beam must meet the design requirements, and disturbance is strictly prohibited.

2. Allowable deviation items

Please refer to the construction acceptance specifications for the specific content and requirements of the allowable deviations of the external dimensions of earth excavation projects and inspection methods.

(4) Protection of finished products

1. During excavation, attention should be paid to protecting the measurement control positioning piles, axis piles, and leveling piles to prevent collisions between excavated soil and earth-moving machinery and equipment. Driving destruction.

2. Drainage ditches and water collection pits should be set up around the foundation pit, and the site should have a certain slope to prevent rainwater from soaking the foundation pit and site. A 50cm layer of soil will be left on the cap platform, water collection wells and ground beams and will need to be manually excavated. It is strictly prohibited for excavators to advance hard into collision engineering piles and enclosure piles, and support piles to ensure the quality of the project.

3. Protection of engineering piles (pipe piles) during excavation:

During foundation pit excavation, the entire enclosure system and permanent structures must not be damaged, including direct damage. Crash and overload. In particular, the ability of supporting components to withstand vertical overload and lateral load is very weak, so protection becomes more important.

During the construction process, especially for support piles and excavations, the height difference of the excavation around the lattice column piles shall not exceed 1M, and the excavation should be carried out evenly in layers.

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