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Method for measuring internal force and deformation of precast pile

A technology of prefabricated piles and internal force, which is applied in the test of foundation structure, construction, foundation structure engineering, etc. It can solve the problems of high cost and poor precision, and achieve the effects of cost control, damage avoidance and high measurement precision

Active Publication Date: 2015-05-20
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of poor accuracy or high cost in measuring the internal force and deformation of prefabricated piles in the prior art

Method used

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  • Method for measuring internal force and deformation of precast pile

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Embodiment Construction

[0011] Below, combined with figure 1 The present invention is described in further detail. figure 1 Winning mark: 1-Anchor head of observation point; 2-Casing; 3-Anchor head of reference point; 4-Sensor; Acquisition instrument.

[0012] Please refer to figure 1 , figure 1 It is a schematic diagram of the device structure of the method for measuring prefabricated pile internal force and deformation of the present invention, and the specific steps of the method of the present invention are:

[0013] (1) According to the geotechnical investigation report, construction records, regional experience and design requirements of the site where the test pile is located, determine the appropriate number of anchor heads at the observation point and the position of the buried section. The anchor head 1 at the observation point can generally be buried at the interface of two soil layers with different properties.

[0014] (2) Casing 2 is buried during pile making. The casing material ...

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Abstract

The invention provides a method for measuring the internal force and the deformation of a precast pile. After a piling procedure is accomplished, a sensor and vertical pile foundation static load experiment equipment which is connected with the sensor are installed; before the next stage of load is exerted, the numerical reading of the sensor under one stage of load is recorded, namely, the relative deformation at an observation point (at which a force transmission rope is connected) and a reference part; the relative deformation is divided by the pile length of the section so as to obtain the relative strain of the observation section relative to a reference plane; the strain difference between two sections is obtained through the strains of two adjacent observation sections relative to the reference plane; and the axial force of the pile body at each anchoring head section is calculated according to the elastic modulus calibration result of the pile body concrete. According to the method for measuring the internal force and the deformation of the precast pile provided by the invention, the sensor is installed after the piling procedure is accomplished, so that the sensor is prevented from being damaged in the piling process, and moreover the measurement precision is high, and the cost can be controlled effectively.

Description

technical field [0001] The invention relates to a method in the technical field of pile foundation quality detection in civil engineering, in particular to a method for measuring the internal force and deformation of prefabricated piles. Background technique [0002] As a foundation form widely used in engineering construction at present, pile foundation has the advantages of small settlement and high bearing capacity, and it is also an important part of structural safety, so it is very important for the detection of pile foundation. [0003] At present, the main methods for testing the internal force of piles are steel bar meter method and sliding micrometer method. (1) Steel bar meter method: The steel bar meter is buried on the main reinforcement of the pile body according to the underlying structure, and the stress and strain of a certain section of the pile body and the bottom of the column are detected. The principle of this test method is simple, and the test compone...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D33/00
Inventor 邬俊杰陈锦剑王建华
Owner SHANGHAI JIAO TONG UNIV
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