Internal force testing method for load test of pre-stress tubular pile

Abstract

The invention discloses an internal force testing method for a load test of a pre-stress tubular pile. The method comprises the following steps: 1, installing a testing tube: the testing tube of a slide micrometer is installed in a constructed pre-stress tubular pile, and the testing tube is arranged in the middle of the pile core of the pre-stress tubular pile in the vertical direction; the bottom of the testing tube is sealed through a sealing cap and the testing tube is full of water; 2, injecting a filling material: the filling material is injected into the cavity between the tubular pile core of the pre-stress tubular pile and the testing tube from bottom to top by adopting grout injecting equipment, and comprises water, cement and bentonite; 3, loading an installation device; 4, loading a load; and 5, testing the internal force of a pile body: after the load is loaded and the pre-stress pile is settled and stabilized, the internal force of the pile body of the pre-stress tubular pile is tested by adopting the slide micrometer. According to the invention, the measuring method has simple steps and is convenient to implement while having high test precision and low investment, so as to obtain the internal force test result of the pre-stress tubular pile simply, conveniently, rapidly and accurately.

Description

technical field [0001] The invention belongs to the technical field of internal force testing of prestressed pipe piles, in particular to an internal force testing method for prestressed pipe pile load tests. Background technique [0002] In the early 1980s, Professor K. Kovari of the Department of Rock and Tunnel Engineering at the Swiss Federal University of Technology Zurich proposed the principle of linewise observation, which is different from the principle of pointwise observation represented by strain gauges; and according to Based on the principle of line method monitoring, a series of portable instruments (including sliding micrometers) have been developed to distinguish them from fixed and buried instruments such as strain gauges and multi-point extensometers. Such instruments have applied for patents and entrusted Swiss Solexperts AG to produce them Sale. [0003] The sliding micrometer is a portable high-precision strain testing instrument developed according to...

AI Technical Summary

Problems solved by technology

However, due to the thin wall of prestressed pipe piles and the use of centrifugal molding, autoclave curing and other production processes, it is difficult to test the internal force of prestressed pipe piles

Adopting the traditional internal force test method will change the material properties and mechanical properties of the prestressed pipe pile on the one hand, and on the other hand, the installation and construction are difficult and the test accuracy is not high

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