Construction method of deep foundation pit support

Abstract

The invention relates to a construction method of a deep foundation pit support. The construction method is characterized by comprising the following steps that site leveling and surveying and setting out are carried out on a design position of a foundation pit; steel pipe pile construction is carried out, and hole forming, grouting and pipe sinking are carried out according to the existing layout chart; capping beam construction is carried out; earth excavation is carried out, and excavation is carried out to the elevation portions of steel strands; steel strand hoops are mounted and are stretched and locked; steel pipe pile surface concrete filling and leveling up are carried out, and the steel strands and steel pipe pile bodies are in lap joint closely; and earth excavation is carried out to the next elevation portions of steel strands, and the above steps are repeated for steel strand construction to the foundation pit bottom. The construction method has the beneficial effects that occupancy on the construction site is reduced; construction is convenient and fast; work efficiency is high; operability is high; construction quality is guaranteed; meanwhile, damage to a soil layer is avoided; the construction method is especially suitable for carrying out in-situ protection on old trees; and the problem that a support structure is prone to being bent and damaged and even turning over is overcome.

Description

technical field [0001] The invention relates to a construction method for deep foundation pit support, in particular to support construction for in-situ protection of ancient trees or buildings in deep foundation pit engineering. Background technique [0002] At present, in the construction industry, in order to carry out the construction of building foundations and basements, it is necessary to excavate the space below the ground, and the temporary pits formed are called foundation pits. According to the relevant administrative measures of our country, the excavation depth exceeds 5 meters, or the excavation depth does not exceed 5 meters, but the geological conditions, surrounding environment and underground pipelines are complicated, or the foundation pit engineering that affects the safety of adjacent buildings (structures) is a deep foundation. pit works. Foundation pit engineering mainly includes design and construction of foundation pit support system and earthwork e...

AI Technical Summary

Problems solved by technology

Slope support requires a large space, bolt support needs to be anchored on the slope, pile row support is dug deep, and the support structure is prone to bending damage or even subversion when the soil pressure is too large. Therefore, the three This traditional foundation pit support method has limitations and cannot meet the actual construction needs when the adjacent buildings or trees that need to be protected in situ are close to the edge of the foundation pit, the surrounding space is limited and the bottom soil layer needs to be protected.

Images