A construction method for super-large deep foundation pit earthwork excavation

Abstract

The invention relates to a construction method of super-large deep foundation pit earthwork, which comprises the following steps: 1) dividing several regions after measurement, and setting soil ramps between the regions; For the soil, the surrounding soil should be constructed later, and the slope support structure should be constructed in time; 3) The middle area of ​​the foundation pit adopts the island excavation technology, and the critical area is constructed first, and then the middle soil is constructed. The transition of the area is stable; 4) Each area is excavated layer by layer and supported layer by layer, and over-excavation is strictly prohibited. Mechanical excavation is mainly used, supplemented by manual repair and excavation, so as to ensure that the original soil is not damaged; 5) The soil ramp adopts retrogression Type excavation technology, excavation step by step from the bottom up. Water intercepting ditches shall be set around the foundation pit, drainage ditches and water collection wells shall be set in the construction area, and the accumulated water shall be pumped and drained in a centralized manner. The beneficial effects of the invention are: the respective advantages of the island basin construction technology are fully utilized, and the construction procedures are effectively connected, the operation progress is fast, the time effect is effectively reduced, and the safety is high.

Description

technical field [0001] The invention relates to the field of foundation pit earthwork excavation, in particular to a construction method for super-large deep foundation pit earthwork excavation. Background technique [0002] At present, with the continuous development of urban construction and the continuous expansion of building scale, large deep foundation pits have become one of the hot and difficult issues in geotechnical engineering. For large deep foundation pits, for the convenience of earthwork excavation and transportation, foundation pit trestles are generally set up, and the construction method of island excavation is used. This method is beneficial for speeding up the earthwork transportation and increasing the excavation speed, but it is unfavorable for the force of the supporting structure. Since the soil around the foundation pit is excavated first, the time effect of the supporting structure is longer, and the supporting structure may be enlarged. The amount...

AI Technical Summary

Problems solved by technology

This method is beneficial for speeding up the earthwork transportation and increasing the excavation speed, but it is unfavorable for the force of the supporting structure. Since the soil around the foundation pit is excavated first, the time effect of the supporting structure is longer, and the supporting structure may be enlarged. The amount of deformation caused certain hidden dangers in construction safety and increased construction costs

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