Top-rigid-and-bottom-flexible deep foundation pit supporting system and construction method thereof

Abstract

The invention relates to a top-rigid-and-bottom-flexible deep foundation pit supporting system and a construction method thereof. The top-rigid-and-bottom-flexible deep foundation pit supporting system comprises vertical shoring members, flexible pulling anchor members, rigid supporting members and stand columns; the flexible pulling anchor members are arranged on the upper portions of the vertical shoring members in inclined and pulling manners; the rigid supporting members are horizontally arranged at the lower portions of the vertical shoring members in an erected manner; at least two rowsof flexible pulling anchor members are arranged; each row of rigid supporting members are arranged vertically and horizontally in the same horizontal plane in a crossed manner; and the distance between the rigid supporting members on the bottommost row and the bottom of a foundation pit is not less than 3 m, and the distance between the rigid supporting members on the topmost row are arranged in azone matched with a water surface of a pressure bearing water layer, and the distance between the flexible pulling anchor members on the bottommost row and the rigid supporting members on the topmostrow is 2 m to 4 m. The top-rigid-and-bottom-flexible deep foundation pit supporting system and the construction method solve the technical problems that flexible pulling anchor structures are adoptedin a high pressure bearing water zone, construction is influenced, stability of the supporting system is not facilitated, and sedimentation of buildings or roads around the foundation pit is caused,and solve the technical problems that when rigid supporting anchor structures are adopted, earth excavation is inconvenient, the construction progress is slow, materials are wasted, and the cost is high.

Description

Technical field [0001] The invention relates to the field of construction engineering, in particular to a deep foundation pit supporting system with flexible top and rigid bottom and a construction method thereof. Background technique [0002] With the acceleration of my country's urbanization process, the development and utilization of urban underground space has received more and more attention, and foundation pit projects have been developing in the direction of super-large and ultra-deep. With the continuous increase of the depth of foundation pits, supporting forms such as single grading and soil-nailed walls can no longer meet the needs of foundation pit safety. For ultra-deep foundation pits, retaining (water) structures + anchor structures are often selected at present. In the construction of deep foundation pits, for the smooth progress of foundation pit excavation, a large amount of groundwater needs to be pumped to lower the groundwater level in the pit. With the incr...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a deep foundation pit support system with a soft top and a rigid bottom and a construction method thereof. It is necessary to solve the problem that the use of a flexible anchor structure in areas with high confined water affects construction, is not conducive to the stability of the support system, and causes The technical problems of settlement of buildings or roads around the foundation pit and the technical problems of rigid anchor structures that are not convenient for earthwork excavation, slow construction progress, waste of materials and high cost

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