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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, applied in the directions of measuring devices, geophysical measurements, and analyzing materials, etc., can solve the problems of large time and money, the exact cause of settlement and inclination cannot be analyzed, and it is not easy to realize building excavation, etc. , to achieve the effect of easy replacement

Inactive Publication Date: 2005-11-23
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] Such as Figure 6 As shown, 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 on 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 meters, no horizontal elastic wave propagating down the pile will be generated at 5.5 meters, and no signal will be detected.

[0066] Even if the receiver is lifted by 0.5 meters to reach 5 meters, and it is hit with a hammer at this time, since the penetration length of the pile is 4.5 meters, the signal will not be detected.

[0067] When the receiver is lifted at a predetermined interval, an impact is applied to the building. The receiver induces a horizontal elastic wave in the section where the pile exists, and due to the existence of the dielectric damping of the pile, the horizontal elastic wave felt is compared to the horizontal w...

Embodiment 2

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

[0072] There is a difference between the medium of the pile at the bottom of the building and the other part of the pile broken from the pile as shown in the figure. Therefore, the horizontal elastic wave 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 measuring method for determining the penetration length of an underground pile and its existence, and a non-destructive measuring device used in the method. Specifically, the present invention relates to a non-destructive measurement method suitable for analyzing the penetration length and existing damage of the pile in the area where the building structure is present on the top of the pile and the pile cannot be detected. The method is based on the building structure When hitting the building with a hammer horizontally or vertically, a horizontal elastic wave is generated. A PVC pipe with a hollow part is buried in the side area adjacent to the predicted pile, and a receiver capable of receiving horizontal elastic waves is placed in the hollow part of the PVC pipe. In, the horizontal elastic wave generated by the hammer and the horizontal elastic wave generated by the soil are received and analyzed to determine the...

Claims

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Application Information

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