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A device and method for measuring the dimension of a subgrade cavity

A measurement method, hollow technology, applied in the field of infrastructure construction, to achieve the effect of simple structure

Active Publication Date: 2019-07-09
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After drilling, the depth of the drilled hole can be easily measured. However, there is no reliable equipment and method to measure the horizontal size of the cavity.

Method used

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  • A device and method for measuring the dimension of a subgrade cavity
  • A device and method for measuring the dimension of a subgrade cavity
  • A device and method for measuring the dimension of a subgrade cavity

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Embodiment Construction

[0011] Please refer to figure 1 and figure 2 , a roadbed cavity size measuring device of the present invention includes a bracket, a laser range finder 20, a rotating disk 30 and a vertical tube 40, the bracket includes a horizontal disk 11 and a plurality of supporting feet 12 for supporting the horizontal disk, the The rotating disc 30 is rotatably arranged on the upper surface of the horizontal disc 11, and the horizontal disc 11 and the rotating disc 30 are respectively provided with relief holes corresponding to the vertical tube 40, and the vertical tube 40 can vertically pass through the rotary disc 30 in a vertically movable manner. and horizontal pan 11. The vertical cylinder 40 and the rotating disk 30 are clamped in the circumferential direction, and the two can rotate synchronously. The side wall of the rotating disk 30 is provided with a clamping piece 32 for limiting the movement of the vertical cylinder 40 in the vertical direction. When the clamping piece 32...

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Abstract

The invention discloses a roadbed cavity dimension measurement apparatus and a method thereof. According to the invention, a laser range finder is arranged at top of a vertical cylinder, a mirror and vertical axis are arranged at the bottom of the vertical cylinder with inclination of 45 DEC, the distance between the laser range finder and the reflection center of the mirror is L1, the vertical cylinder is vertically stretches into cavity, the distance between the reflection center of the mirror and the opening of the cavity is H, the vertical laser emitted by the laser range finder passes through the mirror for reflection and then is horizontally emitted to the sidewall of the cavity, the length value measured by the laser range finder is L2, at the depth H of the cavity, the horizontal size L of the cavity is L2-L1. The value measured by the laser range finder minus the distance between the laser range finder and the reflection center of the mirror, the horizontal size of the reflection center of the mirror to the side wall of the cavity is obtained. The measurement apparatus and the method have the advantages of simple structure, and can rapidly and accurately measure the horizontal size of the cavity.

Description

technical field [0001] The invention relates to a roadbed cavity size measuring device and method, belonging to the field of infrastructure construction. Background technique [0002] Subgrade cavity is a common road disaster. There are roughly two reasons for it. One is that in soluble rock areas, the development of underground karst caves leads to voids in the subgrade; Scours the soil around the pipe, causing voids around the pipe. If the subgrade cavity is not detected in time, when the scale develops to a certain extent, it is prone to collapse under the action of the vehicle load on the upper surface of the road, causing vehicles and people to fall into the cavity, causing serious accidents. For this reason, it is very important to detect subgrade cavities in areas where subgrade cavities may appear. The cavities are generally detected by geophysical methods, such as ground radar method and high-density resistivity method, to detect their location and approximate size...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C3/00
CPCG01C3/00
Inventor 常方强苏世灼舒忠磊
Owner HUAQIAO UNIVERSITY
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