Step-by-step construction method of deep foundation pit floor

Abstract

The invention discloses a step-by-step construction method for base plates of a deep foundation pit. The bottom of the deep foundation pit is divided into a catchment area and a no catchment area. The step-by-step construction method comprises the steps: S1, setting a first temporary catchment treatment part in the catchment area; S2, constructing a base plate cushion layer of the no catchment area; in the construction process of the base plate cushion layer of the no catchment area, collecting water from seepage points of a curtain for cutting off water and discharging the collected water out of the deep foundation pit through the first temporary catchment treatment part; S3, setting a second temporary catchment treatment part on the constructed base plate cushion layer of the no catchment area, and constructing the base plate cushion layer of the catchment area, wherein the height of the base plate cushion layer of the catchment area is lower than that of the base plate cushion layer of the no catchment area; S4, constructing the base plates of the deep foundation pit, reserving a third temporary catchment treatment part on the corresponding position of the base plate cushion layer of the catchment area and a catchment part positioned at the upper end of the third temporary catchment treatment part; S5, conducting closing construction for the third temporary catchment treatment part at the lower end of the catchment part.

Description

technical field [0001] The invention relates to a deep foundation pit construction method, in particular to a step-by-step construction method for the bottom plate of a deep foundation pit. Background technique [0002] Deep foundation pit engineering refers to the earthwork excavation, support, and dewatering engineering of foundation pits (troughs) whose excavation depth exceeds 5m (including 5m), or the excavation depth does not exceed 5m, but the geological conditions, surrounding environment and underground pipelines Earthwork excavation, support, and dewatering engineering of foundation pits (troughs) that are complex or affect the safety of adjacent buildings (structures). [0003] In the construction process of deep foundation pits, the leakage of water cut-off curtains in deep foundation pits is a problem often encountered in construction. The traditional method is to stop the leakage of water cut-off curtains first and then carry out subsequent construction. Due to...

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Problems solved by technology

[0003] In the construction process of deep foundation pits, the leakage of water cut-off curtains in deep foundation pits is a problem often encountered in construction. The traditional method is to stop the leakage of water cut-off curtains first and then carry out subsequent construction. Due to geological, operation and leakage reasons Due to complex and other factors, plugging often takes a long time, construction is repeated, and the foundation pit is soaked in water for a long time, resulting in the failure of construction on the foundation pit floor. The longer the delay, the more uncontrollable factors, the greater the safety hazard, and the impact on the construction period. It may even cause the foundation pit to collapse and cause serious safety accidents.

[0004] For details, please refer to figure 1 , after the completion of the crown and beam of the deep foundation pit, in the process of further excavation, the water cut-off curtain leaked, and the seepage flowed into the bottom of the pit along the cast-in-situ piles, forming water storage at the bottom of the pit, and the continuous flow of water made it impossible to carry out the construction of the bottom of the deep foundation pit , if the water cut-off curtain is not plugged in time, the water cut-off curtain will leak or the leaking water will flow into the bottom of the deep foundation pit, which will cause more water collection and the construction cannot be carried out. In order to continue the bottom construction, the water must be cut off first. Curtain plugging, and then floor construction, and then the plugging work takes a long time, which seriously affects the construction period and construction efficiency

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