Foundation pit support pile using steel pipe pile to replace cast-in-place pile rock-socketed

Abstract

The invention relates to a foundation pit support pile using a steel pipe pile to replace a cast-in-place pile rock-socketed, and belongs to the field of foundation engineering. The foundation pit support pile comprises an upper support cast-in-place pile and a lower rock-socketed steel pipe pile, wherein the rock-socketed steel pipe pile consists of a plurality of steel pipes embedded into a bedrock and cement paste poured; and the upper parts of the steel pipes extend into the support cast-in-place pile to be lapped with a pile body reinforcing bar. During construction, a hole is formed in acomplete bedrock surface, after the hole is formed, the hole is drilled by a drilling machine, the steel pipes are placed into the hole, and the cement paste is poured into the hole, so that the steel pipes and the bedrock are fixedly connected into a whole, and the rock-socketed replacement of the support cast-in-place pile is realized. The method has the advantages that the hole diameter of thesteel pipe pile is larger, the number of holes is small, the centering is easy during pipe placement, the cost is low, the construction speed is high, and the process is simple. A karst cave can be vertically spanned in a karst area, so that materials are saved, and the stability of a rock-socketed section of the support pile is ensured. Meanwhile, in a bedrock fracture development area, the strength of the bedrock is greatly improved by pouring the cement paste, and the problem of strength of the bedrock due to fracture development is solved.

Description

technical field [0001] The invention relates to a foundation pit support and protection pile which uses steel pipe piles instead of cast-in-situ piles for rock-socketing, and belongs to the field of foundation engineering. Background technique [0002] At present, due to the large lateral soil pressure and complex geological conditions of deep and large foundation pits, pile anchors or internal supports are mostly used for foundation pit excavation. Determine a certain depth below the bottom of the foundation pit, reinforce the pile body and pour concrete. However, when the design support piles require rock-socketed construction, often due to the hard bedrock, slow construction speed, vibration or blasting construction, the use safety of the surrounding environment of the foundation pit is affected. When the support piles are excavated piles, there is still life safety. The problem is that concrete overfilling still exists in karst-developed areas. At this time, traditional...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a foundation pit support pile that uses steel pipe piles instead of cast-in-situ piles to solve the shortcomings of the rock-socketed part of the cast-in-situ piles, such as long construction period, high cost, and large construction safety hazards, and at the same time control the small holes. reduce the drilling cost, overcome the centering problem during construction and solve the strength problem of bedrock due to the development of cracks, so as to shorten the construction period, reduce costs and eliminate potential safety hazards

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