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Method and device for non-destructive testing of pile foundation length under column

A non-destructive testing and column technology, which is applied in the direction of foundation structure engineering, foundation structure test, construction, etc., can solve the problem of difficult detection of pile foundation length, and achieve the effect of improving reliability and resolution

Active Publication Date: 2020-06-30
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide a non-destructive testing device for the length of the pile foundation under the column, aiming at solving the problem that the length of the pile foundation of the existing building with a fixed upper part is difficult to detect

Method used

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  • Method and device for non-destructive testing of pile foundation length under column
  • Method and device for non-destructive testing of pile foundation length under column
  • Method and device for non-destructive testing of pile foundation length under column

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Experimental program
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Embodiment 1

[0044] Please refer to figure 1 , this embodiment 1 proposes a non-destructive testing device for the length of the pile foundation under the column, which is used to realize the non-destructive testing of the length of the pile foundation under the column. The column 1A on the first floor above the pile foundation is 4 meters high, and above the column 1A is a beam-slab structure 2A composed of a beam and a roof; two sensors 3A (miniature speed sensors or acceleration sensors) are symmetrically fixed on both sides of the top of the column 1A for Receive vibration in the horizontal direction, and the receiving direction of the two sensors 3A is reversed; on the column 1A below the sensor 3A, set 6 shock points 4A, the 6 shock points 4A are arranged vertically, and the distance between them is 40 cm .

[0045] The elastic wave acquisition instrument is a multi-channel synchronous elastic wave acquisition instrument with multiple sensing channels. In this embodiment, a dual-cha...

Embodiment 2

[0047] see figure 2 , the device for realizing the method for detecting the length of the pile foundation proposed by the present embodiment two, the column 1B above the pile foundation is 4 meters high, and the beam-slab structure 2B consisting of a beam and a roof is above the column 1B; the shock point 4B is located at the top of the column 1B , divided into two groups by 12 sensors 3B (miniature speed or acceleration sensors), arranged from the bottom of the upright column 1B with an interval of 50 cm, and each group of 6 sensors 3B receives vibrations in the same horizontal direction in the same direction. Two groups of sensors 3B The receiving direction is opposite. The sensor 3B is used as a geophone to convert the vibration signal excited by the seismic source into an electrical signal.

[0048] The output signal of the sensor array is connected to the 12-channel synchronous elastic wave acquisition instrument through the signal cable, and the trigger of the hammer v...

Embodiment 3

[0051] see Figure 3 to Figure 6 , this embodiment three is based on the non-destructive testing device for the length of the pile foundation under the column proposed in the first embodiment and the second embodiment, and proposes a non-destructive testing method for the length of the pile foundation under the column, including:

[0052] Step 1: Collect wave signals,

[0053] Using the non-destructive testing device for the pile foundation under the column proposed in the first embodiment, the seismic source with a trigger is used to excite the horizontal vibration in the direction consistent with the receiving direction of the sensor 3A at the excitation point 4A in sequence, and the trigger signal on the seismic source is used to sequentially pass through the dual-channel seismic wave recording instrument Record the seismic wave trains received by the two sensors 3A to form two sets of multi-channel shear wave reflection records consistent with the number of shock points; ...

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Abstract

The invention discloses a nondestructive testing method for the length of a lower pile foundation of a stand column. The method includes the steps that S1, actuating shock points and sensors are arranged on the peripheral side wall, located above the ground and below a cross beam, of the stand column and are further arrayed as follows: the sensors are arranged at the top of the stand column, i actuating shock points are arranged below the sensors at equal intervals along a straight line or the actuating shock points are arranged at the top of the stand column; i sensors are arranged below theactuating shock points at equal intervals along a straight line, and i is larger than or equal to 2; and the distances x1,...,xi from the actuating shock points to the sensors are recorded; S2, original collection records recorded by means of i seismic waves are collected through an elastic wave collecting instrument; S3, pile bottom transverse wave reflected signals from the bottom of the pile foundation are extracted from the original collection records obtained in the S2; and S4, the arrival time ti of transverse wave reflected waves from the pile bottom is picked from the pile bottom transverse wave reflected signals, parameters including the pile length, the pile body speed and the like are resolved according to the transverse wave speed of the stand column, and thus the length of thepile foundation buried under the stand column can be obtained.

Description

technical field [0001] The invention belongs to the technical field of building foundation detection, and in particular relates to a non-destructive detection method and device for the length of a pile foundation under a column. Background technique [0002] The underground tunnel project is carried out under high-rise buildings. When using shield tunneling and other construction methods for excavation, the excavation head should try to avoid the pile foundation under the superstructure. If the completion data of the pile foundation under some buildings is missing, it is urgent to explore The length of the underground pile foundation is specified to provide a basis for tunnel design and construction. Due to the interference of the superstructure, it is of great significance to study low-cost, efficient and accurate non-destructive detection methods. [0003] Small-strain pile foundation detection is a common detection method. The longitudinal wave is excited on the pile hea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M7/00E02D33/00
CPCE02D33/00
Inventor 朱德兵项诸宝冯德山严武平张磊赖虔林高堤
Owner CENT SOUTH UNIV