Sleeve for static-load detection of bearing capacity of permanent pile foundation below bottom of foundation pit

Abstract

The invention relates to a pile foundation detection sleeve used for eliminating pile side friction between a pile body from the natural ground to the top elevation of an engineering pile and a soil body before excavation of a building foundation pit. A sleeve for static-load detection of the bearing capacity of a permanent pile foundation below the bottom of a foundation pit comprises an inner sleeve body (1) and an outer sleeve body (2), wherein the upper end of the inner sleeve body and the upper end of the outer sleeve body are flush, a gap is formed between the inner sleeve body and the outer sleeve body, and the lower end of the inner sleeve body stretches out of the outer sleeve body by a certain length; and full-length longitudinal positioning steel bars (3) are evenly arranged onthe outer wall of the inner sleeve body. Waterstop belts (5) are arranged at the top end and the bottom end of the sleeve and fixed between the inner sleeve body and the outer sleeve body through transverse positioning steel bars (4). The gap between the inner sleeve body and the outer sleeve body is filled with lubricating grease (6). The sleeve for static-load detection of the bearing capacity of the permanent pile foundation below the bottom of the foundation pit has the advantages that the structural design is reasonable, the manufacturing technique is simple, operation is safe, the construction period is short, and the universality is high.

Description

technical field [0001] The invention relates to a pile foundation detection sleeve for how to eliminate the pile side frictional resistance between the pile body and the soil body between the natural ground and the engineering pile top elevation before excavation of a building foundation pit. Background technique [0002] With the rapid development of urban construction in our country, urban land resources are constantly shrinking, and buildings are gradually developing to high altitudes. At the same time, underground space is fully developed and utilized. The foundation of buildings is buried deeper and deeper, and the design and processing of high-rise foundations are becoming more and more complicated. It is an important issue facing modern urban construction. Pile-raft foundation is a commonly used foundation form for high-rise buildings, and the value of the bearing capacity of engineering piles is the key in the design of pile-raft foundation. [0003] How to accurate...

AI Technical Summary

Problems solved by technology

But there are also the following defects: 1. Part of the double-sleeve construction process is to make holes in the inner and outer sleeves, and then hoist the inner sleeve into the outer sleeve, which makes the construction operation procedure complicated

2. There is a large gap between the inner and outer sleeves, which is easy to pour soil and grout, resulting in an increase in the relative friction between the inner and outer sleeves, thus affecting the accuracy and reliability of the single pile bearing capacity test results sex

3. In order to eliminate the gap between the inner and outer sleeves, fillers need to be filled. The existing construction technology is mainly based on water, but the water will rust the sleeve in the sleeve for a long time, and the water is easy to freeze. Winter construction has an impact

4. The filler is mainly injected from both ends of the double sleeves, it is difficult to completely fill the gap between the sleeves, and it also reduces the construction efficiency

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