Do I need to prepare a plan for construction in deep foundation pits? Not excavation. 5

Need. According to the Ministry of Housing and Urban-Rural Development of the People's Republic of China on May 13, 29 issued the "Measures for the Safety Management of Dangerous Sub-project Projects" in the subsidiary documents, deep foundation pits.

The project is: 1) earthwork excavation of foundation pit (groove) with an excavation depth of more than 5m (including 5m).

Support and dewatering projects. (2) Although the excavation depth does not exceed 5m, the geological conditions, the surrounding environment and the underground pipeline are complex, or the earthwork excavation, support and dewatering engineering of the foundation pit (groove) that affects the safety of adjacent buildings (structures).

Foundation pit engineering mainly includes foundation pit support.

System design and construction and earthwork excavation is a very comprehensive system engineering. It requires geotechnical engineering.

Work closely with structural engineering technicians. The foundation pit support system is a temporary structure, which is constructed in the underground project.

Once you're done, you don't need it anymore. [1]

Definition of deep foundation pit: The notice 200987 of the Ministry of Construction on the issuance of the "Notice on the Safety Management Measures for Sub-projects with Greater Risk" stipulates that the general deep foundation pit refers to the excavation depth of more than 5 meters (including 5 meters) or more than three basement floors (including three layers), or the depth is not more than 5 meters, but the geological conditions and surrounding environment and underground pipelines are particularly complex.

In addition, foundation pits and foundation grooves are used to build the foundation of buildings, but the plane shape is different. The foundation pit is square or relatively close to square; The base groove is in the shape of a long strip and is sometimes longer. What you have to grasp is the difference in their shape.

Foundation pit refers to the bottom area within 27 square meters (not 20), and the bottom long side is less than three times the short side of the foundation pit.

The base groove refers to the base groove with the width of the bottom of the groove within 3 meters and the length of the groove is more than 3 times the width of the groove.

That is to say, the general definition of deep foundation pit is: the bottom area is less than 27 square meters (not 20), and the long side of the bottom is less than three times the short side, the excavation depth is more than 5 meters (including 5 meters) or more than three floors of the basement (including three layers), or although the depth does not exceed 5 meters, but the geological conditions and surrounding environment and underground pipelines are particularly complex engineering. (Otherwise, it is a shallow foundation pit).

It is necessary to prepare a program:

If the construction in the deep foundation pit is not excavation, it is the construction of engineering piles or foundation pit support system construction, tower crane foundation construction, etc. These must be prepared and approved by the company and the supervisor before construction.

If it is more than 5 meters of deep foundation pit, then in addition to the engineering pile, the rest shall not be casually constructed, only the preparation of deep foundation pit support and earthwork excavation special construction plan, and the organization of experts to demonstrate and modify and improve the implementation of the implementation.

A special construction plan is required.

Waterproof and leakage plugging project contracting 18920085938

Legal analysis: a deep foundation pit of more than 5 meters requires a special construction plan. When the depth of the foundation pit exceeds 5 meters, it is necessary to carry out expert demonstration of Ming Fiber.

For the design of the special construction scheme for the support of the deep foundation spring imitation pit with an excavation depth of more than 5 meters (including 5 meters), the time limit for the effective use of the support must be indicated, and the demonstration of experts and the approval procedures of relevant units must be improved.

Legal basis: Construction Law of the People's Republic of China

Article 4 The State supports the development of the construction industry, supports the research of building science and technology, improves the level of housing architectural design, encourages energy conservation and environmental protection, and advocates the use of advanced technology, advanced equipment, advanced technology, new building materials and modern management methods.

Article 5 Engaging in construction activities shall comply with laws and regulations, and shall not harm the public interest and the legitimate rights and interests of others.

No unit or individual may obstruct or obstruct construction activities carried out in accordance with the law.

Article 7 Before the commencement of the construction project, the construction unit shall, in accordance with the relevant provisions of the State, apply to the people's construction administrative department at or above the county level where the project is located to obtain a construction permit; However, the exception is for minor works below the limit determined by the construction administrative department.

Not settledConstruction planResponsibility for construction is required and is stipulated in relevant legal provisions.

Construction Law of the People's Republic of China.

32nd construction supervision shall be in accordance with laws and administrative regulations.

and relevant technical standards, design documents and construction contracts, and supervise the contractor on behalf of the construction unit in terms of construction quality, construction period and use of construction funds.

If the project manager believes that the construction of the project does not meet the requirements of the engineering design, the construction technical standards and the contract, he has the right to ask the construction company to make corrections. If the project supervisor finds that the design of the FMC project does not meet the quality standards of the construction project or the quality requirements agreed in the contract, it shall report to the construction unit and require the design unit to make corrections.

Summary. Hello, dear; The preparation of foundation pit engineering plan requires that there is a special construction plan, which shall be organized and prepared by the general contractor of the construction. If the deep foundation pit project is subcontracted, the special construction plan can be organized and prepared by the professional contractor.

The construction unit shall organize experts to demonstrate the special construction plan. The special construction plan shall be reviewed by the technical department of the construction unit and the professional and technical personnel of the construction technology, safety, quality and other departments of the unit. If it is qualified after review, it shall be signed by the technical person in charge of the construction unit.

In the case of general construction contracting, the special construction plan shall be signed by the technical person in charge of the general contractor and the technical person in charge of the relevant professional contractor.

Hello, dear; The preparation of the foundation pit engineering plan should be drafted and the special construction plan should be organized and prepared by the general contractor. If the deep foundation pit project is subcontracted, the special construction plan can be organized and prepared by the professional contractor. The construction unit shall organize experts to demonstrate the special construction plan.

The technical department of the construction unit shall organize the professional and technical personnel of the technical technology, safety, and quality departments of the unit to conduct a review. If it is qualified after review, it shall be signed by the technical person in charge of the construction unit. In the case of general construction contracting, the special construction plan shall be signed by the technical person in charge of the general contractor and the technical person in charge of the relevant professional contractor.

Deep foundation pit engineering refers to the earthwork excavation, support and dewatering engineering of foundation pit with an excavation depth of more than 5m, including 5m; Although the excavation depth does not exceed 5m, the geological conditions, the surrounding environment and the underground pipeline are complex, or the earthwork excavation, support and dewatering works of the foundation pit (groove) that affect the safety of adjacent building structures. The preparation and review of the special construction plan of the deep foundation pit project mainly includes: the construction of the wide unit shall modify and improve the special construction plan according to the demonstration report, and signed by the technical person in charge of the construction unit, the project director and the engineer, and the project leader of the construction unit.

What are the slope excavations.

Grading refers to the earthwork in the construction process, in order to prevent the collapse of the soil wall, to maintain the stability of the side file, increase the width of the excavation mouth, so that the excavation surface to maintain a certain slope, the slope size is generally specified by the construction organization design, when there is no provision, the ordinary soil is according to 1 ratio, the hard soil is graded according to 1 ratio of gravel and gravel, when the site conditions permit, and the experience can ensure the stability of the slope, the slope excavation can be used. The overall stability of the slopes at all levels and the multi-level slopes of Qinglian should be checked at the same time. When there is a local pit near the foot of the slope, the stability of the slope should be checked according to the depth of the pit;

If there is slope protection, the slope is generally dug first, and the slope protection is excavated in a large area after the slope protection, which is not complicated for the surrounding environment, and the excavation depth is 5 7m.

The surrounding environment is complex, there are adjacent buildings, subways, pipelines to protect, there are enclosures and multi-channel supports, basin excavation, layered excavation, enclosure surrounding earthwork will be divided into blocks to jump to open hand liquid potato digging and so on.

Principles of earthwork excavation: layered, balanced and symmetrical excavation. Prevent sudden changes in the internal forces of the supporting structure.

Conventional methods include center island type, basin type, layered regression excavation, etc. How to excavate according to the support plan, geological conditions to develop the earthwork excavation plan, the plan by the expert review before the excavation and burial.