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Harmless measuring method and device for analyzing and determining underground pile penetration length

A technology of measuring devices and measuring methods, which is applied in the directions of measuring devices, geophysical measurements, and analyzing materials, etc. It can solve the problems of large time and money, irreparable column parts, and difficult building excavation, etc., and achieve the effect of easy replacement

Inactive Publication Date: 2007-06-27
MI SUNG C&S INSPECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the latter method does not determine the presence of piles
[0011] Among the above methods, the former method is to carry out visual inspection through excavation around the building, but the existing problem is that it is not easy to realize the excavation of the bottom of the building in actual operation, and even if the excavation is carried out, a large Excavators and large-scale equipment mobilized to solve building safety problems caused by excavation will consume a lot of time and money
[0012] In addition, the problem of the latter method is that although the continuous settlement and inclination of the superstructure can be understood, the exact cause of the settlement and inclination cannot be analyzed, and this method will also consume a lot of measurement time and money
Furthermore, in the event of a broken column, the column is irreparable and the entire hammer must be replaced

Method used

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  • Harmless measuring method and device for analyzing and determining underground pile penetration length
  • Harmless measuring method and device for analyzing and determining underground pile penetration length
  • Harmless measuring method and device for analyzing and determining underground pile penetration length

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065]As shown in Fig. 6, assuming that the penetration length of the pile is 4.5 meters, the cylindrical tube containing the receiver is inserted to a depth of 5.5 meters, the receiver is placed at the bottom of the cylindrical tube, and then, the side of the building is hit with a hammer. Since the penetration length of the pile is 4.5 m, at 5.3 m there is no horizontal elastic wave propagating down the pile and no signal is detected.

[0066] Even if the receiver is raised by 0.5 meters to reach 5 meters and hit with a hammer at this time, since the penetration length of the pile is 4.5 meters, no signal will be detected.

[0067] When the receiver is lifted at predetermined intervals, a shock is applied to the building, and the receiver senses a horizontal elastic wave in the section where piles exist, and due to the presence of dielectric damping of piles, the perceived horizontal elastic wave is compared to the horizontal waveform There is distortion. The presence of de...

Embodiment 2

[0071] As shown in Figure 7, when the penetration length of the pile and its existence are detected by the above-mentioned non-destructive measurement method, when there is a fracture in the middle part of the pile, the penetration length of the pile is shown in the waveform diagram.

[0072] There is a difference in the medium between the pile at the bottom of the building as shown and another part of the pile that breaks away from the pile and the medium of the pile, so horizontal elastic waves cannot propagate through the broken medium and cannot be detected The penetration length of the pile and its existence.

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Abstract

The invention discloses a non-destructive inspection method and a hammer of a non-destructive inspection apparatus for analyzing and determining underground pile penetration length. The hammer of a non-destructive inspection apparatus comprises a steel main body for impacting, a handle connected with the steel main body and a strain sheet for applying impact force. The non-destructive inspection method comprises steps: a digging step for forming an inserting space portion, a cylindrical pipe inserting step for putting the cylindrical pipe into the inserting space portion, a receiver inserting step for inserting the receiver into the cylindrical pipe and an analyzing step for measuring and analyzing impact force signals generated by hammer knocking. When lifting the receiver in the cylindrical pipe at presetting intervals orderly, knocking the side of buildings in presetting intervals, the analyzer analyzes and measures impact force signals generated by knocking the side of buildings and horizontal elastic waves.

Description

technical field [0001] The invention relates to a non-destructive measurement method for determining the penetration length of an underground pile and its existence, and a non-destructive measurement device used in the method. Specifically, the present invention relates to a non-destructive measurement method for analyzing the penetration length of piles and the existing damage, which is suitable for areas where there is a building structure on the top of the pile so that the detection of the pile cannot be realized. The method is based on the building structure In the state, the horizontal elastic wave is generated by hitting the building with a hammer horizontally or vertically, a PVC pipe with a hollow part is buried in the side area adjacent to the predicted pile, and a receiver capable of receiving the horizontal elastic wave is placed in the hollow part of the PVC pipe In , the horizontal elastic wave generated by the hammer strike and the horizontal elastic wave generat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V9/00G01N29/00
CPCG01B5/30G01N3/34G01N29/028
Inventor 金胜
Owner MI SUNG C&S INSPECTION