Construction method for supporting deep foundation pit through grouting after pile arrangement and anchor cable mounting

Abstract

The invention discloses a construction method for supporting a deep foundation pit through grouting after pile arrangement and anchor cable mounting. The construction method comprises the steps that firstly, pile arrangement supporting structure construction is performed, wherein a pile arrangement supporting structure comprises multiple slope protection piles which are arranged along the peripheral edge line of the constructed foundation pit from front to rear and a crown beam connected to the upper portions of the slope protection piles; secondly, foundation pit excavation is performed, wherein the constructed foundation pit is excavated from top to bottom; and thirdly, anchor cable supporting structure and waist beam construction is performed, wherein during excavation of the constructed foundation pit, the constructed foundation pit is excavated to the anchoring position of an anchor cable supporting structure, and the anchor cable supporting structure is constructed; and the anchor cable supporting structure comprises multiple prestress anchor cables, each prestress anchor cable comprises an anchor cable body, a primary grouting pipe and a secondary grouting pipe, and each anchor cable body comprises multiple steel strands. The method has the beneficial effects that the steps are simple, the design is reasonable, construction is easy and convenient, the use effect is good, the deep foundation pit supporting construction process can be completely easily, conveniently and quickly, the cost of the adopted prestress anchor cables is low, the anchoring force is high, and the deep foundation pit can be supported effectively.

Description

technical field [0001] The invention belongs to the technical field of foundation pit support construction, and in particular relates to a construction method for deep foundation pit support after grouting after arranging piles and adding anchor cables. Background technique [0002] When excavating a deep foundation pit with an excavation depth greater than 10m, in order to prevent the surface displacement caused by the excavation construction of the foundation pit, prevent excessive deformation and damage of existing buildings around the foundation pit, and ensure safe construction under the deep foundation pit, and To reduce the impact of deep foundation pits on nearby existing buildings and roads, it is necessary to provide timely and stable support for foundation pits. Nowadays, when supporting foundation pits, a row of piles plus bolt support scheme is usually adopted, specifically a pile-anchor support scheme combining a single row of bored piles and a single layer of ...

AI Technical Summary

Problems solved by technology

However, the above-mentioned pile row and bolt support scheme has problems such as complex construction process, low construction efficiency, and high input cost, and the support effect of the formed pile row plus bolt support structure is poor, and the anchoring force of the anchor bolt Insufficient, especially for deep foundation pits, it is not easy, fast and timely to effectively support deep foundation pits

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