Foundation pit bracing method for extension construction from deep foundation pit to shallow foundation pit

Abstract

The invention relates to a foundation pit bracing method for extension construction from a deep foundation pit to a shallow foundation pit. The foundation pit bracing method comprises the following steps: 1, prefabricated pipe piles are evenly pressed into the junction of the deep foundation pit and the shallow foundation pit at intervals through a piling machine; 2, pile grooves are excavated in a soft basic stratum between every two adjacent prefabricated pipe piles through a grooving machine, the grooves are milled in a rock stratum through a double-wheel groove milling machine, and the pile grooves are excavated to the predetermined depth; 3, in the pile groove excavated process, bentonite mud is poured into the pile grooves for wall protection; and 4, concrete is poured into the pile grooves through a concrete pump and a guide pipe to replace the bentonite mud to form a pile wall, and the pile wall and the prefabricated pipe piles form the overall strength. In the construction process, piling, hole forming and hole-forming grouting can be nearly conducted simultaneously, and compared with a mode of directly drilling a cast-in-place pile, the foundation pit bracing method has the effects that the pile grooves are quickly formed, quality control over the pile grooves is convenient, the construction period is shortened, and the construction efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of foundation pit enclosure, in particular to a foundation pit enclosure method for expanding construction from a deep foundation pit to a shallow foundation pit. Background technique [0002] During the construction process, the original underground foundation is often changed due to the adjustment of the function of the underground structure. On the basis of the underground structure, the axis of the underground structure, the cap pile foundation, the deep foundation pit and the shallow foundation pit shall be protected. [0003] In the prior art, the authorized notification number is the Chinese patent of CN101270579B, which discloses a foundation pit enclosure method for expanding construction from deep foundation pit to shallow foundation pit, which includes the following steps: (1) at the junction of deep and shallow foundation pits Bored cast-in-situ piles are set up by using the gaps on the side of ...

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned existing technical solutions have the following defects: the method of setting bored piles at the junction of deep and shallow foundation pits with gaps at the edge of the cap, especially when some soft bases are used for construction, because it takes a certain time for the concrete to harden, so the construction The cycle is long, and the quality control is difficult at the same time, and it is prone to broken piles and other phenomena

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