Asynchronous sliding device and foundation in-situ testing device and testing method thereof

Abstract

The invention provides an asynchronous sliding device and a foundation in-situ testing device and testing method thereof. By means of the device and method, it is guaranteed that a vertical jack doesnot incline when loads are horizontally applied, and therefore vertical loads are kept stable, and reliability of the test result is ensured. The asynchronous sliding device comprises a box body. A layer of steel balls the same in diameter is flatly laid in the box body, and the steel balls cannot horizontally move in the box body. The tops of the steel balls are higher than the top of the side wall of the box body, a box cover is arranged at the tops of the steel balls in a sliding manner, and the box cover is not in contact with the box body. In the asynchronous sliding device and the foundation in-situ testing device and testing method thereof, when a test piece horizontally moves under the pushing action of horizontal loads, friction resistance between the bottom face of the box body and the test piece is large, and the box body and the steel balls horizontally move together with the test piece; and friction resistance between the bottom of the vertical jack and the box cover is large, the friction coefficient between the steel balls and the box cover is relatively small, the steel balls roll in the box body, the vertical jack and the box cover are fixed, and therefore a horizontal jack and the vertical jack can independently work.

Description

technical field [0001] The invention belongs to the field of in-situ testing of industrial and civil building foundations, and relates to an asynchronous sliding device for horizontal bearing capacity tests of pile foundations with vertical loads and foundation direct shear tests, in particular to an asynchronous sliding device and an in-situ testing device for foundations and test methods. Background technique [0002] In the field of industrial and civil construction, many design parameters of the foundation need to be obtained through in-situ testing on site to ensure that the foundation design is reasonable, economical and safe. The horizontal bearing capacity of pile foundations and the friction coefficient of natural or artificial foundations are two very important design parameters. [0003] Chapter 6 of "JGJ106-2014 Technical Specifications for Building Foundation Pile Testing" stipulates the horizontal static load test of single piles in a free state (no load on th...

AI Technical Summary

Problems solved by technology

In actual work, short round hot-rolled steel bars or short round hot-rolled steel pipes are easy to change the distribution state and shift under the action of horizontal thrust, which will cause the vertical jack to tilt and cannot maintain the stability of the vertical load, resulting in inconsistent test results. Accurate, poor reliability

Moreover, using this method, the operation in the experimental process is complicated, and there is a certain danger in the adjustment of problems.

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