JP2002350113A - Guide pipeline for optically measuring ground displacement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a guide pipeline for optically measuring a ground displacement which is equipped with an optical ground displacement measurement guide pipeline structure fit for measuring a three-dimensional displacement amount of the objective ground and has a high measurement accuracy fit for measuring the ground displaced by a large amount or a generation position where the heaving ground is displaced. SOLUTION: In the guide pipeline 100 for optically measuring the ground displacement, a guide pipe 10 coupled by a socket part 20 is inserted from a ground surface to a boring hole 2 digged in the ground 1 to be measured, and a filling solidification material 3 is filled and fixed to between a wall face of the boring hole 2 and the natural ground. The guide pipe 10 is provided with projecting indicator plates 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring pipe for measuring ground displacement at the site of excavating a slope or a tunnel or excavating a shaft, and more particularly to a measuring guide pipe using an optical ground displacement measuring device. About the road.

[0002]

2. Description of the Related Art As a method of measuring the displacement behavior of the surrounding ground due to excavation work, a method of measuring the inclination of a hollow guide tube buried in the ground with an insertion-type inclinometer has been widely adopted. The inclinometer used at this time consisted of a two-axis inclinometer applying the principle of a pendulum and a measuring sonde for measuring the connection distance. In this method, the measurement range is limited, and there is a restriction on the measurement of the vertical survey line. For this reason, when measuring the ground displacement during slope excavation, the vertical boring hole must be re-excavated, and there has been a problem such as suspension of the excavation work. In addition, there is a problem that the oblique ground displacement cannot be accurately measured, and a problem that it takes time to measure. In order to solve this problem, the displacement of the ground can be measured accurately regardless of the excavation angle of the borehole, and the underground guide tube is photographed as a method of measuring inclination and expansion and contraction due to the displacement behavior of the ground as a method to measure in a short time And Japanese Patent Application Laid-Open Nos. Hei 11-304429 and Hei 11-304430 filed by the present inventor have proposed an optical ground displacement measuring device and a measuring system.

Conventional optical ground displacement measurement guide pipe 1
8, the rubber pipe 25 surrounds a required range of the lower end and the upper end of the guide pipe 10 as shown in FIG.
The rubber plate 25 is fixedly connected to the guide pipe 10 by means of rivets 25a. In FIG.
15 is a guide roller track groove for guiding the insertion of the optical ground displacement measuring device 50 (see FIG. 9), and 13 is a measurement groove provided near the end of the guide pipe. The upper and lower guide pipes 10 and 10 are connected to each other with a gap S in anticipation of a space between expansion and contraction due to ground displacement.

An optical ground displacement measuring device 50 shown in FIG.
Is to determine the displacement of the ground from the internal image of the guide pipe. The expansion and contraction is measured by the image of the gap S and the measurement groove 13, and the inclination is measured by the image of the inclination measuring plate 54a.

[0005] According to the connection by the rubber plate 25, the rivet fixing by the conventional rigid connection pipe is difficult.
Although a joint that can move according to the expansion and contraction of the ground can be obtained, when a shear force is applied from the ground, the upper and lower guide pipes are horizontally displaced, and the upper and lower guide roller raceway grooves 15 are stepped to produce a step. There was a problem that the type ground displacement measuring device could not be inserted. Further, depending on the displacement behavior of the ground, the same problem occurs even if the guide pipe 10 is displaced in an oblique direction.

When the displacement of the ground is large, the gap S between the upper and lower guide pipes becomes large.
When the interval of 13 becomes large, there is a problem that one of the measurement grooves does not appear in the photographing range of the CCD camera of the optical ground displacement measuring device and measurement in one image cannot be performed.

[0007] Further, in the measurement at a large depth such as several hundred meters underground, the surrounding filler such as groundwater and mortar penetrates into the guide pipe due to the influence of the pressurized water and the like, and the lime component and the like thereof. As a result, there is a problem that the image for measurement becomes unclear and the measurement accuracy decreases.

Furthermore, in the measurement of expansion and contraction of the guide conduit when inclined, there is a problem that a standard marker for minimizing an accuracy error for correcting image distortion due to the inclination with a standard conversion coefficient is not provided. Was.

[0009]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides an optical ground displacement measurement guide pipe structure suitable for measuring the three-dimensional displacement of a target ground, and provides a ground having a large displacement. The purpose of the present invention is to provide a guide pipe for optical ground displacement measurement with high measurement accuracy, which is suitable for the measurement of the ground displacement and the displacement occurrence position of the bulging ground.

[0010]

According to an aspect of the present invention, there is provided an optical ground displacement measurement guide pipe according to the first aspect of the present invention, which measures a displacement behavior of a surrounding ground due to construction work on the ground such as excavation. An optical ground displacement measurement guide pipe installed in a boring hole excavated deep in the ground, wherein the guide pipe includes a plurality of guide pipes, a socket portion connecting the guide pipes, and a boring hole. The guide pipe is composed of a solidified material fixed to the ground, the guide pipe has a plurality of guide roller track grooves for guiding the insertion of the optical ground displacement measuring device therein, and a projecting sign provided inside one end of the guide pipe. A plate and a measurement mark provided at the other end or inside the both ends of the guide pipe, wherein the socket portion is a socket of a hard pipe having an inner diameter substantially equal to the outer circumference of the guide pipe. When the first fixing means for connecting the front and rear of the guide pipe which is connected to hold the stretch allowance gap,
A second fixing means that can be broken by the displacement pressure of the ground, and a waterproof portion that covers both end portions of the socket, wherein the image of the projecting sign plate of the guide pipe and the mark of the other connected guide pipe are optically ground. It is characterized in that it is arranged in the imaging range of the displacement measuring device.

According to the present invention, there is no blockage due to impact load and vibration when the guide conduit is buried in the ground, and there is no deformation of the guide roller trajectory of the measuring device, and after installation, the optical ground displacement that follows the displacement behavior of the ground. A guide conduit for measurement can be provided. Particularly, by providing the protruding sign plate, a large displacement in the axial direction of the measurement pipeline can be measured.

According to a second aspect of the present invention, in the first aspect of the present invention, the guide pipe has a friction absorbing coating layer on an outer peripheral surface thereof to reduce a change in length of the guide pipe due to expansion and contraction of the ground. It is characterized by.

According to the present invention, the intermediate portion of the guide pipe can be prevented from being integrated with the ground by the coating layer, the amount of expansion and contraction of the guide pipe due to the displacement of the ground is minimized, and the expansion and contraction of the marker for measurement is achieved. The change in the reference length can be prevented, and the displacement of the ground can be accurately grasped by measuring the expansion and contraction of the connection portion.

A third aspect of the present invention is the invention according to the first or second aspect, wherein the socket has an outer peripheral surface formed into an uneven surface shape and follows a displacement behavior due to expansion and contraction of the ground. I do.

According to the present invention, the displacement behavior of the ground can be accurately measured by focusing on the expansion and contraction of the connecting portion. For measurement of the ground where expansion and contraction is expected to be large,
By shortening the length of the guide pipe to 1 m and increasing the number of connection portions, highly accurate displacement measurement can be performed.

According to a fourth aspect of the present invention, there is provided the first or second aspect of the present invention, wherein the protruding sign plate is provided with a colored mark for measurement on a surface of a tip portion thereof and a predetermined fixed size interval behind the point. Actual guide marks (standard markers) are displayed or engraved in a checkerboard pattern, and at least four faces facing up, down, left, and right inside the guide pipe, or a plurality of guide pipes at every angle equally dividing the inner circumference It is characterized by being fixed so as to protrude.

According to the present invention, even if the upper and lower guide pipes are largely separated by the extension of the ground, the signage plate is projected, so that the separation distance can be photographed as an image. Further, when the inclination increases, a standard marker of a known size is photographed on the inclined image, so that it is possible to perform highly accurate expansion / contraction correction.

According to a fifth aspect of the present invention, in the first or second aspect of the present invention, the measurement mark is provided on at least four sides facing the upper, lower, left and right inside the guide pipe, or at every angle equally dividing the inner circumference. It is characterized in that colored mark points having a constant interval are displayed or engraved from the tip of the guide pipe toward the inside.

According to the present invention, it is possible to measure a large displacement by capturing an overlapping image of the colored marking point of the marker plate protruding from one end and a plurality of measurement marks.

A sixth aspect of the present invention is the invention according to any one of the first to fifth aspects, wherein the guide pipe includes an expansion / contraction measuring rod formed therein with the same length as the guide pipe, By fixing one end of the extension measurement rod to the guide pipe and supporting the other end slidably,
It is characterized in that the tip of the extension measurement rod is a measurement reference point isolated from the extension and contraction of the guide pipe due to the displacement behavior of the ground.

According to the present invention, as a measurement point which is not affected by the expansion and contraction of the guide pipe due to the ground displacement, it is possible to measure the displacement with high accuracy by measuring the distance between the fixed end and the movable end of the telescopic measuring rod. it can.

A seventh aspect of the present invention is the invention according to any one of the first to sixth aspects, wherein the optical ground displacement measuring guide pipe is provided around the boring hole into which the guide pipe is inserted. When filling a solidified material such as mortar and fixing it to the ground, install a water supply pipe inserted from the ground to the tip of the guide pipe, fill or circulate fresh water inside the guide pipe, and The waterproof part is damaged for some reason,
It is characterized by preventing infiltration from the ground due to internal water pressure even when the waterproof function is reduced.

According to the present invention, even if the waterproof portion of the guide tube connecting portion is damaged for some reason and the waterproof function is reduced, the lime component of the solidified filler penetrates into the inside of the guide tube, and the bottom of the guide tube. Can be prevented, and it is possible to prevent the marked point in the guide tube from becoming dirty so that a clear image cannot be obtained.

The invention according to claim 8 is the invention according to claim 1, wherein the first fixing means uses a corrosion-resistant metal rivet containing aluminum, and the second fixing means comprises:
The present invention is characterized in that a plastic rivet having a strength to withstand an eccentric load and an impact load when the guide pipe is inserted into the boring hole is used.

According to the present invention, it is possible to easily perform the work of penetrating the boring hole when the guide conduit is buried,
A guide pipe that can accurately follow the displacement behavior of the ground can be installed. In addition, the plastic rivet is sheared according to the displacement behavior of the ground, so that the connecting portion of the guide conduit can expand and contract.

[0026]

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

FIG. 1 is a sectional view showing the structure of an optical ground displacement measuring guide conduit 100 according to the present invention. A guide pipe 10 connected by a socket part 20 from the ground surface penetrates into a boring hole 2 excavated in the ground 1 to be measured, and a solidified solid material 3 is filled between the boring hole 2 and the ground on the wall surface of the boring hole 2. Fixed.

The distal end of the guide pipe 10 at the deepest portion is
Sealed. The connecting part of the upper and lower guide pipes 10 is fixed to the socket part 20 with a space S between them. Further, a projecting sign plate 11 is provided inside the guide pipe.

FIG. 2A is a sectional view of the guide pipe 10. Guide roller track grooves 15 for guiding the insertion of the optical ground displacement measuring device 50 (see FIG. 9) are provided on the inner surface of the guide pipe at intervals of 90 degrees on the inner circumference of the guide pipe. The optical ground displacement measuring device is provided with rollers before and after its housing (probe cases 51 and 52), and can be guided by the guide roller raceway groove 15 to take a measurement image while maintaining a fixed direction.

A projecting sign plate 11 is fixed to the end 10a of the guide pipe 10 with a rivet with the tip protruding from the end. In this embodiment, the guide pipe 1
It is provided at an interval of 90 degrees on the inner circumference of zero. Inside, four first fixing holes 16 for rivets for connection with the socket 21 are formed at 90-degree intervals.

On the other end 10b of the guide pipe 10, measurement marks 12 are marked on the four faces facing up, down, left and right inside the guide pipe at regular intervals from the tip of the guide pipe toward the inside. In the present embodiment, the intervals are 90 degrees, but they may be provided at every equally divided angle of the inner circumference.
Two fixing holes 17 for rivets for connecting to the socket 21 are formed at two positions at 180 ° intervals on the inside.

FIG. 2B is a sectional view showing an AA section of FIG. 2A. 15 is a guide roller track groove, and 11 is a projecting sign plate. In this embodiment, the protruding sign plate 11 is formed in a plate shape, but may be formed in a round bar shape.

FIG. 3 is a sectional view showing a connection structure between the socket portion 20 and the guide pipe. The socket portion 20 is a hard pipe having an inner diameter substantially equal to the outer circumference of the guide pipe 10 and having an outer peripheral surface made uneven by a file or the like to increase a friction coefficient. The ends of the guide pipes 10 and 10 are inserted into the socket 21, fixed in the first fixing holes 16 with metal rivets 22, and fixed in the other second fixing holes 17 with plastic rivets 23.
A space S for expansion and contraction is formed between a and 10b. Socket 2
Both ends of 1 are hermetically sealed by a waterproof portion 24. The waterproof portion 24 has a waterproof structure in which a deformable butyl rubber is applied, a butyl tape is wound, and the surface is further sealed with an epoxy resin.

The provision of the socket portion 20 eliminates the impact load, vibration blockage and deformation of the guide roller trajectory when the guide conduit is buried underground, and follows the displacement behavior of the ground after installation. Guide pipe for optical ground displacement measurement can be provided. Particularly, by providing the protruding sign plate, a large displacement in the axial direction of the measurement pipeline can be measured.

The guide pipe 10 shown in FIGS.
A friction absorbing coating layer 14 is provided on the outer peripheral surface of the pipe to prevent the guide pipe 10 from being integrated with the inner wall ground of the boring hole 2,
The expansion and contraction of the guide pipe 10 due to the displacement of the ground is prevented. The structure of the friction absorbing coating layer 14 is
A friction absorbing effect can be enhanced by winding a resin sheet around the zero surface and forming a two-layer structure (not shown) in which the upper surface is covered with a heat shrinkable tube. Note that it is preferable to use a fluororesin sheet made of tetrafluoroethylene or the like as the resin sheet.

Next, the structure of the projecting marker plate 11 is shown in FIG.
This will be described below. At the tip of the protruding sign plate 11, a colored marking point 11a for measuring the distance between the opposing guide pipe 10 and the measurement mark 12, an actual size guide mark 11b behind it, and a pipe for attaching to the guide pipe 10 It has mounting holes 11c, 11c. In this embodiment, the actual size guide marks 11b are displayed in a grid pattern at a predetermined fixed size interval.
The marking points are arranged in squares.

FIG. 5 is a sectional view of the guide pipe 10 provided with the extension measuring rod 30. Elongation measurement rod 30
Is fixed to the guide pipe 10 with a fixing jig 31 at one end using a metal or resin material having the same length as the guide pipe 10 and having a small temperature change, and slides into a through hole of a slide guide 32 for preventing bending to the other end. It is movably supported. An end fixed to the guide pipe 10 is a fixed reference point 30a, and a movable reference point 30b that moves in and out of the end of the guide pipe 10 as the guide pipe 10 expands and contracts.

If the guide pipe 10 provided with the extension / contraction measurement rod 30 is used, even if the guide pipe 10 expands / contracts due to the displacement behavior of the ground, the extension / contraction measurement rod 30 at which both ends of the guide pipe 10 do not change is fixed. Mark 30a
And the change in the distance between the movable guide point 30b of the connected guide pipe 10 and the movable guide point 30b can be measured by photographing the change as image information.

FIG. 6 is a schematic view of a guide pipe provided with a water supply pipe. Guide line 100 for optical ground displacement measurement
A water supply pump 9a is provided on the ground, and the water supply pipe 9 is inserted into the guide pipe 10, and the fresh water discharge port 9b at the tip thereof is arranged so as to reach the bottom of the pipe. This water supply pipe fills and circulates fresh water inside the pipe, increasing the pressure in the guide pipe and damaging the waterproof part of the guide pipe connection part for some reason. Prevents infiltration of solidified material 3 and groundwater.

In particular, the penetration of the lime component when the solidification material 3 such as mortar is poured into the gap between the boring hole 2 and
The image capturing of the optical ground displacement measuring device becomes unclear or impossible due to adhesion to a pipe or settling on a pipe bottom. For this reason, an effect is exhibited at the time of laying the guide pipeline.

Next, measurement of ground displacement using the guide pipe of the present invention will be described. The optical ground displacement measuring device 50 shown in FIG. 9 has a structure in which an upper probe case 51 and a lower probe case 52 are connected by a universal joint 56 so as to follow the vertical inclination of the guide conduit. The upper and lower probe cases 51 and 52 have guide rollers 58 at the front and rear, respectively, and guide roller track grooves 1 of the guide channel.
5 is inserted.

The upper probe case 51 includes a CCD camera 53 and a controller 57 for transmitting image information of the CCD camera 53. The conical mirror 5 is supported by the lower probe case 52.
4 are incorporated. The probe case around the conical mirror 54 serves as a transparent window 59 so that the image of the guide channel
The light is reflected by the lens portion 53a of the CD camera 53. In addition, the conical mirror 54 has a tilt measuring plate 54a at the apex, and obtains a gauge image for measuring the tilt of the tilt shaft 55.

FIG. 7 shows a connecting portion of the guide pipe according to the present invention.
5 shows an image captured by the optical ground displacement measuring device 50. At the center of the image 60, an inclination measuring plate 54a is shown. When the upper and lower guide channels are tilted, the tilt measuring plate 54a moves by the tilt angle from the center of the image. By analyzing and measuring the distance between the colored mark 11a of the projecting sign plate 11 attached to the guide pipe 10 and the measurement mark 12 of the connected guide pipe 10, the amount of expansion / contraction of the expansion / contraction margin S is measured.

[0044]

According to the guide pipe for measuring the optical ground displacement of the present invention, there is no blockage due to the impact load, vibration and deformation of the guide roller trajectory of the measuring apparatus when the guide pipe is buried underground.
After installation, a guide conduit for optical ground displacement measurement that follows the displacement behavior of the ground can be provided. Particularly, by providing the protruding sign plate, a large displacement in the axial direction of the measurement pipeline can be measured. Further, the displacement can be measured with high accuracy.

According to the second aspect of the present invention, the intermediate portion of the guide pipe can be prevented from being integrated with the ground by the coating layer, the amount of expansion and contraction of the guide pipe due to the displacement of the ground is minimized, and It is possible to prevent a change in the reference length due to the marker expansion and contraction, and to accurately grasp the displacement of the ground by measuring the expansion and contraction of the connection portion.

According to the third aspect of the present invention, the displacement behavior of the ground can be accurately measured by focusing on the expansion and contraction of the connecting portion. In the measurement of the ground where the occurrence of expansion and contraction is predicted to be large, the length of the guide pipe can be shortened to 1 m and the number of connecting portions can be increased to perform highly accurate displacement measurement.

According to the fourth aspect of the present invention, even if the upper and lower guide pipes are largely separated by the extension of the ground, the sign plate is projected, so that the distance can be photographed as an image. Further, when the inclination increases, a standard marker of a known size is photographed on the inclined image, so that it is possible to perform highly accurate expansion / contraction correction.

According to the fifth aspect of the present invention, it is possible to measure a large displacement by photographing an overlapping image of the colored marking point of the marker plate protruding from one end and the plurality of measurement marks.

According to the sixth aspect of the present invention, as a measurement point which is not affected by expansion and contraction of the guide pipe due to ground displacement, highly accurate displacement measurement can be performed by measuring the distance between the fixed end and the movable end of the telescopic measuring rod. can do.

According to the seventh aspect of the present invention, the lime component of the solidified filler penetrates into the inside of the guide pipe, and sedimentation at the bottom of the guide pipe and the marked points in the guide pipe become dirty, so that a clear image cannot be obtained. Can be prevented.

According to the eighth aspect of the present invention, the guide pipe can be easily inserted into the boring hole when the guide pipe is buried, and the guide pipe capable of accurately following the displacement behavior of the ground is provided. be able to. In addition, the plastic rivet is sheared according to the displacement behavior of the ground, so that the connecting portion of the guide conduit can expand and contract.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing the configuration of an optical ground displacement measurement guide pipe according to the present invention.

2A is a sectional view of a guide pipe, and FIG. 2B is a sectional view taken along line AA of FIG.

FIG. 3 is a cross-sectional view illustrating a connection structure between a socket portion and a guide pipe.

FIG. 4 is a plan view of a protruding marker plate.

FIG. 5 is a cross-sectional view of a guide pipe provided with a telescopic measuring rod.

FIG. 6 is a schematic view of a guide pipe provided with a water supply pipe.

FIG. 7 is a schematic diagram showing an image of a guide pipe connecting portion.

FIG. 8 is a cross-sectional view of a conventional guide pipe for optical ground displacement measurement.

FIG. 9 is a schematic diagram showing an optical ground displacement measuring device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ground 2 Boring hole 3 Filling solidification material 4 Bottom cover 9 Water supply pipe 9a Water supply pump 9b Fresh water discharge port 10 Guide pipe 10a End 10b Other end 11 Projection sign plate 11a Colored mark 11b Actual size guide mark 12 Measurement mark 14 Friction absorbing coating Layer 15 Guide roller track groove 16 First fixing hole 17 Second fixing hole 20 Socket part 21 Socket 22 Metal rivet 23 Plastic rivet 24 Waterproof part 30 Extension measurement rod 30a Fixed reference point 30b Movable reference point 50 Optical ground displacement measuring device Reference Signs List 51 upper probe case 52 lower probe case 53 CCD camera 53a lens unit 54 conical mirror 54a tilt measuring plate 55 tilting axis 56 universal joint 58 guide roller 59 transparent window 100 guide pipe for optical ground displacement measurement

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hirotaka Nakahara No. 2, Sanbancho, Chiyoda-ku, Tokyo Tobishima Construction Co., Ltd. (72) Inventor Kazunobu Matsumoto No. 2, Sanbancho, Chiyoda-ku, Tokyo (72) Inventor Masayuki Tsutsui 2nd Sanbancho, Chiyoda-ku, Tokyo Tobishima Construction Co., Ltd. (72) Inventor Yukiki Kumagai 2nd Sanbancho, Chiyoda-ku, Tokyo Tobishima Construction Co., Ltd. F-term in the formula company (reference) 2D054 GA15 GA62 GA82 2F065 AA09 AA31 AA65 BB27 CC00 EE00 FF04 FF41 JJ03 JJ26 LL11 PP02 PP26 2F076 BB09 BD02 BD05

Claims (8)

[Claims] An optical ground displacement measurement guide pipe installed in a boring hole excavated deep in the ground to measure a displacement behavior of a surrounding ground due to construction work on the ground such as excavation, The guide pipe is composed of a plurality of guide pipes, a socket portion connecting the guide pipes, and a solidified filler fixed to the ground of the boring hole, and the guide pipes are internally provided with an optical ground displacement measuring device. A plurality of guide roller track grooves for guiding the insertion, and a projecting sign plate provided inside one end of the guide pipe,
A measurement mark provided inside the other end or both ends of the guide pipe, wherein the socket portion has a hard pipe socket having an inside diameter substantially equal to the outer circumference of the guide pipe, and a guide pipe before and after being connected to the guide pipe. First fixing means for holding and connecting the second fixing means, and second fixing means which can be broken by displacement pressure of the ground,
An optical device comprising: a waterproof portion covering both end portions of a socket; and an image of the projecting sign plate of the guide pipe and an image of a mark of the other connected guide pipe arranged in a photographing range of an optical ground displacement measuring device. Guide conduit for measuring ground displacement. 2. The optical ground displacement measuring apparatus according to claim 1, wherein the guide pipe is provided with a friction absorbing coating layer on an outer peripheral surface to reduce a change in length of the guide pipe due to expansion and contraction of the ground. Guide conduit. 3. The guide conduit for optical ground displacement measurement according to claim 1, wherein the socket has an outer peripheral surface formed into an uneven surface shape and follows a displacement behavior due to expansion and contraction of the ground. . 4. The protruding sign plate is provided with a colored mark for measurement on the surface of its tip and a real size guide mark (standard marker) displayed in a grid pattern at a predetermined fixed size interval behind it. A plurality of guide pipes are fixed so as to protrude from the tip of the guide pipe at least at four sides facing up, down, left and right inside the guide pipe, or at every angle equally dividing the inner circumference. 2. A guide conduit for measuring an optical ground displacement according to 2. 5. The measurement mark indicates at least four faces facing the inside, the top, the bottom, the left, and the right inside the guide pipe, or the colored marking points having a constant interval from the tip of the guide pipe toward the inside at every angle equally dividing the inner circumference. 3. The guide line for measuring an optical ground displacement according to claim 1, wherein the guide line is stamped. 6. The guide pipe includes an expansion / contraction measurement rod formed therein at the same length as the guide pipe, and one end of the expansion / contraction measurement rod is fixed to the guide pipe and slid to the other end. 6. The flexible guide according to any one of claims 1 to 5, wherein the distal end of the telescopic measurement rod is a measurement reference point isolated from the telescopic action of the guide pipe due to the displacement behavior of the ground. Guide line for optical ground displacement measurement. 7. The optical ground displacement measurement guide pipe is filled with a solidifying material such as mortar around the boring hole into which the guide pipe is inserted and fixed to the ground.
Provide a water supply pipe inserted from the ground to the tip of the guide pipe, fill or circulate fresh water inside the guide pipe, and even if the waterproof part of the guide pipe connection is damaged for some reason and the waterproof function is reduced, 7. An optical ground displacement measurement guide pipe according to claim 1, wherein water pressure prevents penetration from the ground. 8. The first fixing means uses a corrosion-resistant metal rivet containing aluminum, and the second fixing means reduces an uneven load and an impact load when a guide pipe is inserted into a boring hole. The guide pipe for optical ground displacement measurement according to claim 1, wherein a plastic rivet having a strength to withstand is used.