Definition of deep foundation pit, what is deep foundation pit?

At present, the new regulations issued by the state in September stipulate that foundation pits larger than five meters belong to deep foundation pits.

Generally, deep foundation pit refers to the excavation of more than 5 meters (including 5 meters) or more than three floors (including three floors) of the basement, or although the depth does not exceed 5 meters, the geological conditions, the surrounding environment and underground pipelines are particularly complex.

Foundation pit engineering mainly includes the design and construction of foundation pit support system and earthwork excavation, which is a very comprehensive system engineering. It requires close cooperation between geotechnical and structural engineering technicians. The foundation pit support system is a temporary structure, which is no longer needed after the completion of the underground engineering construction.

The foundation pit lead air and attitude disturbance foundation groove are both used to build the foundation of the building, 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).

Generally, deep foundation pit refers to the excavation depth of more than 5 meters or more than three basement floors, or the depth is not more than 5 meters, but the geological conditions, surrounding environment and underground pipelines are particularly complex.

According to the Ministry of Housing and Urban-Rural Development of the People's Republic of China on May 13, 2009 issued the "Dangerous Sub-project Key Shelter Safety Management Measures" in the subsidiary documents, deep foundation pit engineering is:

Earthwork excavation, support and dewatering works for foundation pits with an excavation depth of more than 5 meters. Although the excavation depth does not exceed 5 meters, the geological conditions, surrounding environment and underground pipelines are complex, or the earthwork excavation, support, and reduction of the foundation pit that affect the safety of adjacent buildings are combined.

Deep foundation pit refers to the excavation depth of more than 5 meters or more than three layers of basement, or the depth of the excavation is not more than 5 meters, but the geological conditions, the surrounding environment and underground pipelines are particularly complex.

According to the Ministry of Housing and Urban-Rural Development of the People's Republic of China on May 13, 2009 issued the "Safety Management Measures for Dangerous Sub-project Safety Management Measures", the deep foundation pit project is:

earthwork excavation, support and dewatering engineering of foundation pit or foundation groove with an excavation depth of more than 5m; Although the excavation depth does not exceed 5m, the geological conditions, surrounding environment and underground pipelines are complex, or the earthwork excavation, support and dewatering works of the foundation pit that affect the safety of adjacent buildings.

Deep foundation pit refers to the excavation depth of more than 5 meters of front shed slag or more than three layers of basement, or although the depth does not exceed 5 meters, but the geological conditions and surrounding environment and underground pipelines are particularly complex engineering.

According to the Ministry of Housing and Urban-Rural Development of the People's Republic of China on May 13, 2009 issued the "Measures for the Safety Management of Dangerous Sub-project Safety Management Measures" in the subsidiary documents, and the deep foundation pit project is:

earthwork excavation, support and dewatering engineering of foundation pit or foundation groove with an excavation depth of more than 5m; Although the excavation depth does not exceed 5m, the geological conditions, surrounding environment and underground pipelines are complex, or the earthwork excavation, support and dewatering works of the foundation pit that affect the safety of adjacent buildings.

Summary. This question is up to me, it takes a little time to type, so please be patient.

This question is up to me, it takes a little time to type, so please be patient.

Definition of deep foundation pit: The Ministry of Construction Construction Quality No. 200987 document on the issuance of the "Notice on the Safety Management Measures for Sub-project 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 layers of basement (including three layers), or although the depth does not exceed 5 meters, the geological conditions and surrounding environment and underground pipes and old lines are particularly complex projects.

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