Foundation pit enclosure structure capable of realizing supporting while excavating and foundation pit excavating method

Abstract

The invention relates to a foundation pit enclosure structure capable of realizing supporting while excavating and a foundation pit excavating method. The geological condition is shown in a targeted way according to the excavation, corresponding supporting parameters are adopted, the supporting reliability is improved, the measures of the enclosure structure are more reasonable, and the construction cost is effectively reduced. The foundation pit enclosure structure comprises an advance support (10), a primary support (20) and a supporting system, wherein the advance support (10) is exerted on a pre-reinforcement rock soil body formed in the rock soil at the outer side of a foundation pit excavation line, the primary support (20) is fully and annularly exerted on the vertical excavation surface of a foundation pit, a sealed rock surface body is formed, the supporting system comprises vertical steel enclosing purlins (30), steel transverse supporters (41) and steel inclined supporters (42), the vertical steel enclosing purlins (30) are arranged at intervals on the outer wall of the relatively sealed rock surface body, the steel transverse supporters (41) are fixedly arranged among the corresponding vertical steel enclosing purlins (30), and the steel inclined supporters (42) are fixedly arranged on two adjacent outer walls of the sealed rock surface body.

Description

technical field [0001] The invention relates to a foundation pit enclosure structure in civil engineering, in particular to a foundation pit enclosure structure and a foundation pit excavation method that can be dug and protected. Background technique [0002] The foundation pit enclosure structure mainly bears the water pressure and earth pressure generated by the excavation and unloading of the foundation pit, and transfers this pressure to the support. It is a temporary retaining wall structure for stabilizing the foundation pit. [0003] The traditional foundation pit enclosure structure is applied before the foundation pit excavation, and it is formed once. After the enclosure structure reaches the design strength, the foundation pit excavation is carried out, and the soil around the foundation pit is not pre-reinforced. The enclosure structure cannot be adjusted according to the excavation reveal. Economy and reliability cannot be balanced. In addition, the tradition...

AI Technical Summary

Problems solved by technology

The enclosure structure cannot be adjusted according to the excavation reveal

Economy and reliability cannot be balanced

In addition, the traditional enclosure structure also has the following problems: 1. The depth of the enclosure structure is much greater than the excavation depth of the foundation pit

2. The mud required for opening the enclosure structure and forming the trench wall will easily cause environmental pollution

3. The opening of the enclosure structure and the mechanical construction of the trough generate a lot of noise

4. The construction risk is high, and there are potential safety hazards in the hoisting of steel cages

5. High cost

[0004] The problems referred to above have not been effectively solved for a long time in the technical field

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