JP2006118906A - Device for exploring underground conduit and method for exploring underground conduit using the device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive, simple device for exploring underground conduit, and a method for exploring underground conduit capable of confirming the correct position of buried electrical conduit in a short time. <P>SOLUTION: The truck is provided with: omnidirectionaly rotatable spherical wheels as running wheels; a weight fixed to the lower part; side wheels projected to the side walls with a small clearance from a conduit wall; and inclination angle sensors mounted for detecting the forward and backward inclination angle of the truck. The under ground exploratory device is constituted such that the inclination angle information signals from the inclination angle sensors are displayed on a remote monitor, and also provided with the method of calculating the buried depth of the underground conduit based on the information of inclination angles and moving distance from the device. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an apparatus for reliably detecting the embedment depth of a buried telephone line tube from the ground surface without dug up the ground, and a method of using the apparatus.

Various pipes such as telephone lines, electric lines, water and sewage pipes and gas pipes are buried in the ground below the road. Since the position of such a buried pipeline is described in a completed drawing at the beginning of laying, it is easy to confirm the buried depth. However, as time elapses from the time of laying, the depth of burial changes over time due to land subsidence or nearby construction, etc., and the completed drawings etc. are lost and means to check from drawings and literature etc. May be lost.
For this reason, when newly laying buried pipes, or when excavating the ground by repairing or replacing existing buried pipes, underground facilities construction work, etc., in order to prevent damage and breakage of existing buried pipes, There are cases where it is necessary to know the current position and depth of the existing buried pipe without relying on drawings or documents.

  There is a method of using electromagnetic waves as a method of knowing in advance the position and depth of the buried pipe without relying on drawings or documents. This is a three-dimensional exploration method in which an electromagnetic wave or a sound wave is radiated into the ground while moving on the ground surface, a reflected wave from the buried object is received, and the received signal is processed to search the position of the buried object. It is. In the three-dimensional exploration, a three-dimensional exploration device is used. This device emits electromagnetic waves toward the ground at a specific position on the ground surface, receives a reflected signal from the buried object, and is constant. The reception intensity after the reflection time of the interval is measured.

Originally, in the 3D exploration method, the position of the buried object can be grasped without omission by taking the position of the 3D exploration apparatus on the ground surface in a grid pattern at regular intervals. When scanning above, depending on the actual field environment, it is not always possible to perform accurate grid-like scanning, and the position of the embedded object may not be completely grasped. The invention described in Japanese Patent Application Laid-Open No. 2000-75025 provides a method of complementing the position of an embedded object at a leaked portion when accurate grid-like scanning cannot be performed.
JP 2000-75025 A

  By the way, in the construction of the buried telephone line tube, the position on the plane of the buried telephone line tube can often be estimated from the position of the telephone line manhole and other telephone line manholes adjacent to this telephone line manhole. There are cases where only the buried depth of the buried telephone line is unknown. The above-described three-dimensional exploration method requires a large amount of equipment, takes time, and uses expensive equipment. In such a case, it is extremely inconvenient.

In addition, buried telephone line tubes are buried by bundling several to tens of telephone line tubes between telephone line manholes and telephone line manholes with openings on the ground surface. Has an open end. The telephone line is inserted from the open end and laid in the buried telephone line tube. In preparation for an emergency, at least one of the bundled several to dozens of telephone line tubes is used. The line tube is always a spare tube without a telephone line laid inside, and the inside remains hollow.
The inventor of the present application pays attention to this spare tube, and as a result of earnest research, has reached the present invention.

  Therefore, the present invention provides an inexpensive and simple buried pipe exploration device, and by using this spare pipe, the buried pipe can be easily confirmed in a short time by using the spare pipe. The purpose is to provide a road exploration method.

In order to achieve the above object, the buried pipe exploration device according to the first aspect of the present invention is a tilt angle detection that detects a tilt angle in the front-rear direction of the carriage in a carriage that is pulled and moved in the buried pipeline. The carriage is mounted with a sensor, and the carriage automatically corrects the inclination of the carriage perpendicular to the front-rear direction, and the wall of the carriage prevents the body of the carriage from contacting the pipe wall of the buried pipeline. The tilt angle information signal detected by the tilt angle detection sensor is transmitted to a remote monitor via a cable and displayed.
Further, the buried pipeline exploration device according to the second aspect of the present invention is the buried pipeline exploration device according to the first aspect, wherein the carriage moves in the buried pipeline, It is characterized by comprising an impact mitigation device for mitigating the impact received from the recess.
The buried pipeline exploration device according to claim 3 of the present application is the buried pipeline exploration device according to claim 1 or 2, wherein the carriage inclination correcting device is a traveling wheel of the carriage. The tube wall contact prevention device protrudes from the side of the carriage to the left and right in the forward and backward direction of the carriage. The impact mitigation device is configured such that the position of the ball wheel relative to a side view is set back and forth with respect to the front-rear direction of the carriage. It is characterized by being staggered.
Further, the buried pipeline exploration method according to the invention of claim 4 is an buried pipeline exploration method using the buried pipeline exploration device according to any one of claims 1 to 3, wherein the carriage is The embedded pipes are inserted between the open ends of the buried pipes that are buried between the manholes and have open ends in the respective manholes, and are pulled by a tow rope that reaches the other open end to move in the buried pipes. The horizontal angle and the vertical distance from one open end of the buried pipeline at the current position of the carriage are calculated by synchronizing the inclination angle information from the inclination angle detection sensor with respect to the movement distance in the vehicle, and then the buried pipe It is characterized in that a horizontal distance from one open end of the road and a buried depth from the ground surface to the buried pipeline at the horizontal distance are calculated.

As described above, according to the invention according to claim 1 of the present application, the carriage is pulled and moved in the buried pipeline and does not have a self-propelled structure. Therefore, the buried pipeline exploration device itself has a simple structure and is easy to maintain and economical. In addition, even if some kind of trouble occurs in the trolley in the buried pipeline, if the rope pulling the trolley is attached not only to the front and rear direction of the trolley but also to the rear part of the trolley, It is very easy to remove the cart that has been stuck in the buried pipeline.
Moreover, since the carriage is equipped with a carriage inclination correcting device and a pipe wall contact prevention device, the carriage moves without meandering in the buried pipeline and can always maintain the same posture in the buried pipeline. . Therefore, the inclination angle detection sensor that detects the inclination of the carriage relative to the front-rear direction detects the inclination of the buried pipeline itself by detecting the inclination of the carriage.

  And since the tilt angle information signal detected by the tilt angle detection sensor is transmitted to the remote monitor via the cable and displayed, the tilt angle information signal transmitted from the ground is interrupted unlike the case of wireless. It is surely displayed on the monitor. The monitor is remote from the cart, and if the monitor is installed on the ground, the tilt angle information that changes every moment can be recorded on the desk. Furthermore, for example, the tilt angle information can be automatically recorded in time series by connecting a personal computer to the monitor. Moreover, if a scale of length is attached to the cable itself like a tape measure, the moving distance of the carriage can be easily measured by the cable.

  And, according to the invention according to claim 2 of the present application, since the carriage is equipped with the impact mitigation device, the impact received by the buried pipeline exploration device from the stepped portion and / or the depression portion of the tube bottom is mitigated, The life cycle of the buried pipeline exploration device becomes longer, leading to a reduction in costs required for maintenance of the buried pipeline exploration device.

  Further, according to the third aspect of the present invention, the cart inclination correcting device has a very simple structure comprising a sphere wheel that is pivotable in all directions fixed to the cart, and a weight that is fixed to the lower portion of the cart. And there are few failures.

In this cart tilt correction device, when the cart tilts, the bottom of the tube has a cylindrical shape. Therefore, the position of the weight moves upward and the potential energy of the cart itself becomes high. In order to reduce this potential energy even when the carriage is moving forward by the ball wheel fixed to the carriage, the carriage is moved in a direction perpendicular to the front-rear direction. Can be moved.

  The tube wall contact prevention device is composed of rotatable wheels protruding left and right from the side of the carriage, and its structure is as simple as the above-described carriage inclination correcting device. Since this wheel is opposed to the buried electric conduit wall with a slight gap, it is possible to prevent the cart from swinging left and right with respect to the front-rear direction when the cart moves.

  The tube bottom impact mitigating device is fixed by shifting the position of the ball wheel back and forth with respect to the traveling direction of the carriage. The stepped portion and / or the recessed portion at the bottom of the tube is mainly present at the joint portion between the buried pipeline and the buried pipeline, and the portion is orthogonal to the pipeline direction. For this reason, by shifting the position of the ball wheel of the carriage back and forth, the left and right wheels do not pass through the joint portion at the same time. Or the impact which a cart receives when passing a hollow part can be eased.

  According to the invention according to claim 4 of the present application, the horizontal distance and the vertical distance from one open end of the buried conduit at the current position of the buried pipeline exploring device are the moving distance and the inclination angle of the buried conduit exploring device. Although it is calculated from the tilt angle information from the detection sensor, this calculation is not so difficult, can be easily performed by using a calculator, and has high accuracy. And if the horizontal distance and the vertical distance from one open end of the buried conduit at the current position of the buried pipeline exploration device are known, the height of the ground surface at this horizontal distance can be measured on the ground. The depth from the ground surface to the carriage can be calculated, and consequently, the buried depth of the buried pipeline group bundled from the ground surface can be calculated.

  Hereinafter, an embodiment according to the best mode for carrying out the present invention will be described with reference to FIGS. 1 is a side view of the buried pipeline exploration device according to the present embodiment, FIG. 2 is a view taken along the line II-II of FIG. 1, and FIG. 3 is a buried conduit exploration device according to the present embodiment. It is explanatory drawing of the buried pipe line exploration method using a.

  1 and 2, reference numeral 1 denotes an embedded pipeline exploration device according to the first embodiment, reference numeral 10 denotes a carriage, reference numeral 12 denotes a carriage body, reference numeral 14 denotes a front carriage frame, reference numeral 16 denotes a rear carriage frame, and reference numeral 18 denotes Front running ball wheel, reference numeral 20 is a rear running ball wheel, reference numeral 22 is a sphere, reference numeral 24 is a sphere gripping body, reference numeral 26 is a side wheel, reference numeral 28 is a side wheel support shaft, reference numeral 30 is a weight, reference numeral 32 is a tow rope, Reference numeral 34 denotes a cable, reference numeral 36 denotes a monitor, and reference numeral 40 denotes an embedded pipeline.

  The buried pipe exploration device 1 is roughly divided into a cart 10 and a cart body 12 and a tilt angle detection sensor (not shown) that is housed and fixed, a tow rope 32 that pulls the cart 10, a monitor 36, And a cable 34 for connecting the tilt angle detection sensor and the monitor 36 to each other.

The carriage 10 includes a carriage body 12, a front carriage frame 14, a rear carriage frame 16, one front running ball wheel 18, two rear running ball wheels 20, and four side wheels 26. In FIG. 1, the carriage 10 is pulled by a tow rope 32 having one end secured to the left side of the carriage 10 and moves in the left direction of the drawing. Therefore, the left side of the carriage 10 is the front part of the carriage and the right side is the rear part of the carriage.
The cart body 12 is a casing, and as described above, an inclination angle detection sensor (not shown) is accommodated therein. In this embodiment, the product name “Digital Angle Sensor DP-641” (manufactured by Marui Keiki Co., Ltd.) is used as the tilt angle detection sensor. A front carriage frame 14 is fixed to the front end of the carriage main body 12, and a rear carriage frame 16 is fixed to the rear end of the carriage main body 12.

One front traveling ball wheel 18 is fixed to the lower surface of the front bogie frame 14, and the front traveling ball wheel 18 holds a metal sphere 22 which is the wheel itself and the sphere 22 so as to be rotatable. It is comprised from the spherical holding body 24 to do. Two rear traveling ball wheels 20, 20 are fixed to the lower surface of the rear front bogie frame 16, and the rear traveling ball wheel 20 has the same configuration as the front traveling ball wheel 18. The rear running ball wheels 20, 20 are arranged to be shifted back and forth in the side view. In front view, as shown in FIG. 2, when the carriage 10 is installed in the buried pipeline 40, the rear running ball wheel is arranged radially from the center of the cross section of the buried pipeline 40 that takes a circular shape. 20 is configured to contact the inner peripheral surface of the buried conduit 40 vertically.
In this embodiment, the traveling wheels of the carriage are one front traveling ball wheel 18 and two rear traveling ball wheels 20, and the carriage is supported at three points on the tube bottom of the buried conduit 40. Therefore, the cart will not rattle. Further, the “shift” in the front-rear direction of the rear traveling ball wheels 20 and 20 is 22 mm in a side view, and the rear traveling ball wheels 20 and 20 arranged radially and the center of the cross section of the circular buried pipe 40 are formed. The included angle is 60 ° in front view.

  Side wheel support shafts 28 are vertically provided on both sides of the front end of the upper surface of the front bogie frame 14 and on both sides of the upper end of the upper surface of the rear bogie frame 16, and the side wheels 26 are pivotally supported at intermediate portions thereof. Has been. As shown in FIG. 2, the line connecting the side wheels 26, 26 on both sides passes through the center of the buried pipeline 40 that has a circular shape when the carriage 10 is installed in the buried pipeline 40. , 26 are arranged so as to be located at a slight distance from the tube wall of the buried conduit 40.

  The inner diameter of the buried electric conduit 40 is usually 78 mm for a telephone tube, and the carriage 10 is also formed in accordance with this size. The total length of the carriage 10 is approximately 270 mm, and the width is the outer and outer dimensions of the side wheels 26 and 26. The height is 77 mm and the height is approximately 70 mm. Therefore, the gap between the side wheel 26 and the pipe wall of the buried pipeline 40 is 0.5 mm.

Next, a method of using the buried pipeline exploration device 1 will be described.
As described above, the buried pipeline 40 is embedded by bundling several to several tens of electric pipes between manholes having openings on the ground surface, and each manhole has an open end. is doing. Of the bundled electric pipes, at least one electric pipe is always required to be a spare pipe in which the electric wire is not laid and the inside remains hollow. The buried pipeline exploration device 1 is a device that uses the buried pipeline 40 that is a reserve pipe.

(1) First, a messenger wire is inserted into the buried pipeline 40 from the open end of the buried pipeline 40 to be searched.
(2) When the tip of the tow rope 32 is bound to one end of the messenger wire and one end of the messenger wire is pulled, the tip of the tow rope 32 protrudes from the open end of the other buried conduit 40. In this state, the tow rope 32 is stretched from one manhole to the other manhole through the buried conduit 40.
(3) When the tip of the traction rope 32 protruding from the open end of the other buried pipeline 40 in the other manhole is pulled, the carriage 10 enters the buried pipeline 40 from the open end of the one buried pipeline 40. enter in. At this stage, the distance measuring tool such as a tape measure and the tilt angle detection sensor for measuring the moving distance are confirmed and zero correction is performed.
(4) When the tip of the tow rope 32 is further pulled, the carriage 10 further enters the buried pipeline 40. While the carriage 10 is moved, the moving distance is measured, and a signal from the tilt angle detection sensor is read to synchronize the numerical value of the moving distance and the numerical value of the tilt angle.
(5) After repeating the process shown in (4), the carriage 10 is further pulled to move, the carriage 10 is recovered from the open end of the other buried pipeline 40, and the cable 32 is removed. The removed cable 32 is recovered from the open end of one of the buried conduits 40, and the work on site is completed.
(6) After that, the numerical value of the synchronized movement distance and the numerical value of the inclination angle are calculated by the calculation method described below, and the embedment depth from the ground surface to the embedment pipeline 40 is calculated.

Next, a method for calculating the buried depth of the buried pipeline will be described with reference to FIG.
In FIG. 3, reference numeral 42 denotes an open end of the buried conduit 40, and reference numeral 50 denotes a manhole. In FIG. 3, the buried pipeline 40 indicates a spare pipe, and actually, a plurality of stages and a plurality of rows of buried pipeline groups exist around the buried pipeline 40.

Here, the position of the open end of the buried pipe 40 and A ₀ point, and from the point to the horizontal distance will be described for calculating the embedded depth H ₁ of the buried pipe 40 of D ₁ away A ₁ point.
H ₁₁ is a level difference between A ₀ point and A ₁ point, H ₁₂ is a level difference between the top of manhole 50 and the top of buried pipe 40 at A ₀ , H ₁₃ is the diameter of buried pipe 40, and H ₁₄ is a level difference in the tube base buried pipe 40 in the tube bottom and a ₁ point buried duct 40 at the open end 42. Here, the value of H ₁₁ is “+” when the level at the A ₀ point is higher than the A ₁ point, and is “−” when the level is lower. In the example of Figure 3 the value of H ₁₁ is "+". _{Further, l 1, l 2, ··} , l n is the moving distance of the carriage 10 when the synchronous inclination angle and the moving distance, alpha _1, alpha _2, carriage 10 when ..., the alpha _n synchronized The inclination angle. Here, when α is a depression angle, “+” is set, and when it is an elevation angle, “−” is set. In the example of FIG. 3, α is a depression angle and its value is “+”.

Distance _{D 1} of the A ₀ point and the _{A 1} point is,
_{D 1 = d 1 + d 2} + ·· + d n (1)
Represented by
A The buried depth H ₁ of the buried pipeline 30 at _one point is:
_{H 1 = H 11 + H 12} + H 13 + H 14 -H 13 = H 11 + H 12 + H 14 (2)
It is represented by
Additional _{l 1, l 2, ··,} d 1, d 2 a horizontal distance corresponding to _{l n,} · ·, and _{d n,} the vertical distance _{h 1, h 2, ···,} When _{h n,}
H ₁₄ = h ₁ + h ₂ +... + H _n (3)
It is represented by Also,
d ₁ = l ₁ cosα ₁ , d ₂ = l ₂ cosα ₂ ,..., d _n = l _n cosα _n
h ₁ = l ₁ sinα ₁ , h ₂ = l ₂ sinα ₂ ,..., h _n = l _n sinα _n
Therefore, this is substituted into the formulas (1) and (3), and the formula (3) is substituted into the formula (2).
D ₁ = l ₁ cosα ₁ + l ₂ cosα ₂ + ·· + l _n cosα _n (4)
H ₁ = H ₁₁ + H ₁₂ + (l ₁ sinα ₁ + l ₂ sinα ₂ + ·· + l _n sinα _n ) (5)
It becomes.

In the above (4) and _{(5), l 1, l 2, ··} , l n and _{α 1, α 2, ··,} α n is an numerical value obtained from buried duct exploration device 1 , H ₁₁ and H ₁₂ are numerical values obtained by a known surveying instrument such as a level or a tape measure. Thus, (4) and (5) a simple arithmetic expression is buried deep H ₁ of buried duct 40 of A ₁ point obtained as equation similar manner other adjacent to A ₁ point and The burial depth of the burial pipeline 40 at the point can be obtained.
As described above, the buried telephone line tube is buried by bundling several to several tens of telephone line tubes, and the bundled telephone line tube group is buried on the inner wall of the manhole 50 as it is. It is revealed with a cross section. Therefore, the level difference between the top end of the buried telephone line tube group and the buried pipe line 40 can be measured from the cross section of the telephone line tube group shown on the inner wall of the manhole 50, and the buried telephone line tube group is determined from the level difference. The burial depth can be easily calculated.

FIG. 1 is a side view of the buried pipeline exploration device according to the present embodiment. 2 is a view taken in the direction of arrows II-II in FIG. FIG. 3 is an explanatory diagram of a buried pipeline exploration method using the buried pipeline exploration device according to the present embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Buried line exploration apparatus according to the present embodiment 10 Bogie 12 Bogie body 14 Front bogie frame 16 Rear bogie frame 18 Front running ball wheel 20 Rear running ball wheel 26 Side wheel 30 Weight 32 Tow rope 34 Cable 36 Monitor 40 Buried pipeline 50 manhole

Claims (4)

An inclination angle detection sensor that detects an inclination angle in the front-rear direction of the carriage is mounted on the carriage that is pulled and moved in the buried pipeline,
The carriage includes a carriage inclination correcting device that automatically corrects the inclination of the carriage orthogonal to the traveling front-rear direction, and a pipe wall contact prevention device that prevents the main body of the carriage from contacting the pipe wall of the buried pipeline. Prepared,
The embedded pipe line exploration device, wherein the inclination angle information signal detected by the inclination angle detection sensor is transmitted to a remote monitor via a cable and displayed.   The buried pipe according to claim 1, wherein the carriage includes an impact mitigating device that mitigates an impact received from a stepped portion and / or a recessed portion of a pipe bottom when moving in the buried pipeline. Road exploration equipment. The cart inclination correcting device is composed of a sphere wheel that is rotatable in all directions that is a traveling wheel of the cart, and a weight fixed to a lower portion of the cart,
The tube wall contact prevention device is composed of a rotatable wheel that protrudes from the side of the carriage to the left and right in the forward and backward direction of the carriage and faces the left and right pipe walls of the buried pipeline with a slight gap. ,
3. The buried pipe exploration according to claim 1, wherein the impact mitigation device is fixed by shifting the position of the ball wheel with respect to a side view in the front-rear direction with respect to the traveling direction of the carriage. apparatus. The carriage is inserted from one open end of a buried pipeline buried between manholes and having an open end in each manhole,
Moved by the tow rope reaching the other open end and moving in the buried pipeline,
Calculating the horizontal distance and the vertical distance from one open end of the buried pipeline at the current position of the carriage by synchronizing the tilt angle information from the tilt angle detection sensor with respect to the moving distance in the buried pipeline,
Thereafter, a horizontal distance from one open end of the buried pipeline and a buried depth from the ground surface to the buried pipeline at the horizontal distance are calculated. A buried pipeline exploration method using the buried pipeline exploration device described in 1.

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