JPH0942958A - Device for measuring moving distance of scanner probe of device for observing wall surface of drilling hole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the moving distance measuring accuracy of a scanner probe of a device for observing the wall surface of a drilling hole to a specified order. SOLUTION: At the time of observing the inner wall surface of a drilling hole 3, a scanner probe 5 is inserted into the drilling hole 3 to a required measuring block, and a winch 11 is driven by the command of a control device 7 so as to pull the scanner probe 5 from the required measuring block of the drilling hole 3 to the hole opening. During the time that the scanner probe 5 is moved in the block to be photographed in the drilling hole 3, the scanner probe 5 scans the inner wall surface in response to the signal to be generated by a moving distance measuring device 13 per each time of winding a distance measuring wire 12 at 0.1mm. Position of this scanning image can be specified to the accuracy at 0.1mm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boring hole wall surface observing device used for geological survey at a construction site when excavating a dam or an underground cavity, and more particularly to a moving distance measuring device for a scanner probe thereof.

[0002]

[Problems to be Solved by the Invention] In order to excavate a large-scale underground cavern such as a dam or tunnel, properly grasp the changes in the ground due to excavation, etc. and perform construction and construction methods corresponding to the changes. There is a need. Therefore, in general, drilling around the underground cavern is carried out and the changes in the ground are grasped as follows.

That is, a specific observation surface is set around the construction underground cavity, and the inner wall surfaces of a plurality of boring holes provided on the observation surface are regularly observed in accordance with the progress of excavation and the like, and cracks formed in the bedrock. By comparing the position and width of the time series and measuring the displacement, we can grasp the change of the ground.

For this reason, the currently required observation accuracy is 0.1 mm or less for the minimum confirmation width for confirming cracks or bedding surfaces that are likely to become cracks, and the minimum confirmation of the absolute distance from a fixed point. The unit is 0.
It is 1 mm.

Conventionally, the moving distance of the scanner probe has been measured by the number of rotations of the pulley of the wire that pulls the scanner probe. However, with this method, due to slippage between the wire and the pulley, the pulling amount of the wire and the rotation speed of the pulley did not match, and an error occurred on the order of several cm.

The present invention has been made for the purpose of increasing the accuracy of measuring the moving distance of a scanner probe of a boring hole wall surface observing device from the order of several cm in the related art to the order of 0.1 mm.

[0007]

In order to achieve the above object, the present invention is configured as follows.

That is, in a boring hole wall surface observing device for connecting a pulling wire to a scanner probe inserted in a boring hole and pulling and moving the scanner probe to observe the wall surface of the boring hole, the distance measuring wire and the distance are measured. Winding drum for measuring wire, winding means for rotating the winding drum to wind the distance measuring wire at a constant tension, and winding the distance measuring wire based on the rotation speed of the winding drum. And a winding amount measuring means for measuring the amount, the tip of the distance measuring wire is connected to the scanner probe, and the movement distance from the hole opening of the scanner probe is calculated from the winding amount of the distance measuring wire. It is a scanner probe moving distance measuring device for measuring.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional explanatory view of the essential parts of an embodiment of the present invention. In the figure, 1 is a construction underground cavity, 2 is an observation tunnel excavated in parallel along the construction underground cavity 1, and 3 is an observation tunnel 2 to the construction underground cavity 1 for investigating the geology around the construction underground cavity 1. It is a boring hole that penetrates toward. The observation tunnel 2 and the boring hole 3 are excavated before the excavation of the construction underground cavity 1.

The boring hole wall surface observing device 4 for observing the inner wall surface of the boring hole 3 controls the operation of the scanner probe 5, the traveling portion 6 that movably supports the scanner probe 5, and the scanner probe 5. It is composed of a control device 7 for processing the observation data from the scanner, a display device 8 for displaying the observation data of the scanner probe 5 on a monitor, and a recording device 9 for recording the observation data of the scanner probe 5.

A pulling wire 10 is connected to the rear end of the scanner probe 5, and the winch 11 pulls and moves the scanner probe 5. A distance measuring wire 12 is also connected to the rear end of the scanner probe 5, and the moving distance of the scanner probe 5 is measured by the moving distance measuring device 13.

The scanner probe 5, the winch 11, and the moving distance measuring device 13 are connected to the control device 7 via a signal cable 14, and the control device 7 performs the image data processing of the scanner probe 5, the winch 11 and the moving distance. The operation control of the measuring device 13 and the processing of moving distance measurement data are performed.

The boring hole wall surface observing device 4 is constructed as described above, and when observing the inner wall surface of the boring hole 3, the scanner probe 5 is inserted up to the required measuring section of the boring hole 3. Then, the winch 1 is instructed by the controller 7.
1 is driven to pull the scanner probe 5 from the required measurement section of the boring hole 3 to the hole opening. Scanner probe 5
Scans the inner wall surface in accordance with a signal emitted every time the moving distance measuring device 13 winds the distance measuring wire 12 by 0.1 mm while moving in the imaging section in the boring hole 3. As a result, the position of this scanning image is 0.
An accuracy of 1 mm can be specified. The image scanned by the scanner probe 5 is the moving distance measuring device 1
3 is sent to the control device 7 in synchronization with the distance data measured by the device 3, and is recorded in the recording device 9.

FIG. 2 is a schematic perspective view of the moving distance measuring apparatus according to the embodiment of the present invention. The moving distance measuring device 13 spirally forms a groove b in which a distance measuring wire 12 having a total length of 30 m and a diameter of 0.9 mm is wound and accommodated on a rotating drum a having a diameter of about 30 cm which is rotated by the power of a mainspring (not shown). Engrave. An encoder c that rotates in conjunction with the rotary drum a is attached to the rotary shaft of the rotary drum a. This encoder c is an optical rotary encoder, and is 10 per rotation.
000 pulses are generated.

The moving distance measuring device 13 is constructed as described above, and when measuring the moving distance of the scanner probe 5 inserted into the boring hole 3, the winch 11 is driven to pull the scanner probe 5. When the scanner probe 5 is pulled, the distance measuring wire 12 stretched around the scanner probe 5 is loosened, and in order to restore the looseness, a rotational force is generated in the rotary drum a and the rotary drum a is rotated. The encoder c rotates in accordance with the rotation of the rotary drum a and generates a pulse proportional to the amount of rotation. The encoder c generates one pulse every time the rotary drum a winds the distance measuring wire 12 by 0.1 mm. Therefore, the moving distance of the scanner probe 5 can be determined by counting the amount of this pulse generated. It can be measured in units of 0.1 mm. The final moving distance of the scanner probe 5 is
It is obtained after correcting the deformation of the rotating drum a and the distance measuring wire 12 due to the temperature.

[Brief description of drawings]

FIG. 1 is an explanatory cross-sectional view of a main part of an embodiment of the present invention.

FIG. 2 is a schematic perspective view of a moving distance measuring device according to the embodiment of the present invention.

[Explanation of symbols]

 1 Construction underground cavity 2 Observation tunnel 3 Boring hole 4 Boring hole Wall surface observation device 5 Scanner probe 6 Traveling part 7 Control device 8 Display device 9 Recording device 10 Traction wire 11 Winch 12 Distance measuring wire 13 Moving distance measuring device a Rotation Drum b Groove c Encoder

Claims (1)

[Claims] 1. A boring hole wall surface observing device for observing a boring hole wall surface by connecting a pulling wire to a scanner probe inserted into a boring hole and moving the scanner probe by pulling the wire, the distance measuring wire and the distance. Winding drum for measuring wire, winding means for rotating the winding drum to wind the distance measuring wire at a constant tension, and winding the distance measuring wire based on the rotation speed of the winding drum. Winding amount measuring means for measuring the amount, and connecting the tip of the distance measuring wire to the scanner probe, the movement distance from the hole mouth of the scanner probe from the winding amount of the distance measuring wire. Scanner probe moving distance measuring device to measure.