JP2007309723A - Pipeline shape measuring instrument for buried pipe, and pipeline shape measuring method using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipeline shape measuring instrument for buried pipes and a pipeline shape measuring method that uses the same, for surely measuring the bending directions and bending angles of the buried pipes at a coupling using a simple structure, and accurately obtaining the pipeline shape, as a whole, of the buried pipes. <P>SOLUTION: This pipeline shape measuring instrument comprises a cylindrical sensor pipe 3 made up of a front pipe 6 and a rear pipe 7, coupled together by means of a universal jointing member 15 and put through the pipe line of the buried pipes 9 together coupled by means of the coupling 8; and a coupling detection means 4 for detecting the position of the coupling 8 connected to the sensor pipe 3. The front and rear pipes 6 and 7 are made severally bendable along the adjoining buried pipes 9. The sensor pipe 3 is equipped with a bend detection means for measuring the bending directions and the bending angles of the buried pipes 9. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an apparatus for measuring the line alignment of a buried pipe laid in the soil used for power cables, water and sewage, gas, communication, and the like, and a pipeline using the same. It relates to a shape measurement method.

Currently, many buried pipes are laid in the soil, but since these were laid in the past, the diameter is small, and the diameter of power cables and communication lines installed in them is also small. Small and small capacity. However, recently, since the amount of electric power and the amount of communication has increased, it is desirable to install large capacity cables and communication lines in these buried pipes, but the diameter is too small to be used.
For this reason, it is necessary to open the groove and take out the buried pipe and bury a new thick pipe, but this is too expensive.
In such a case, the applicant has developed a technique for pushing out a thick pipe while destroying it in the soil without taking out the old buried pipe (Japanese Patent Application No. 2005-212929), but uses this construction method efficiently. If the bend angle is too large, it is difficult to push in the thick pipe in accordance with the embedment position of the thin buried pipe unless the bend angle of the buried pipe is measured in advance. It turned out to be.

  Patent Document 1 discloses a method for grasping the alignment of these buried pipes. Patent Document 1 is a pipeline shape measurement evaluation method, which calculates the deviation between the center axis of the pig body and the pipeline center axis from the output of the distance measuring means installed on the outer periphery of the pig body, While correcting the error caused by the posture, it detects the joints between the pipes that make up the pipeline, measures the line shape for each pipe, and based on the measurement results, at the joints between the pipes in the pipeline The laying condition is evaluated in consideration of inconsistencies.

  However, the method of Patent Document 1 has a complicated structure, and it is difficult to take out this when it is caught by a foreign substance or the like in the pipe in the middle of the pipe. Moreover, the detection of the joint part in this method is performed based on the change in the measured value in the distance measuring means when passing through the convex part on the inner surface of the welded part of the pipe. That is, it is performed on the assumption that there is a convex portion in the welded portion of the pipe, and further on the assumption that there is no foreign matter in the pipe line. Since the buried pipe laid in the soil may contain soil mixed in the pipeline, the method of Patent Document 1 appropriately uses the pipeline when such foreign matter is mixed in the pipeline. It is difficult to measure the linearity.

Japanese Patent Laid-Open No. 2004-333149

  The present invention takes the above prior art into consideration, and with a simple structure, the bending direction and the bending angle of the buried pipe in the joint can be reliably measured, and the linearity of the pipe line of the entire buried pipe is accurately determined. It is an object of the present invention to provide a pipeline linear measurement device for buried pipes and a pipeline linear measurement method using the same.

  In order to achieve the above object, according to the first aspect of the present invention, the position of the cylindrical sensor pipe passing through the pipe line of the buried pipe connected through the joint and the joint connected or installed to the sensor pipe is determined. An embedded pipe linear measurement device having a joint detection means for detecting, wherein the sensor pipe is composed of a front pipe and a rear pipe connected by a universal joint member, and the front pipe and the rear pipe are The sensor pipe is bendable along each of the adjacent buried pipes through the joint, and the sensor pipe has a bending direction of the adjacent buried pipe through the joint according to the bending direction and the bending angle of the front pipe and the rear pipe. Provided is a conduit linear measuring device for an embedded pipe, which is provided with a bending detection means for measuring a bending angle.

  According to a second aspect of the present invention, in the first aspect of the present invention, the bend detection means is composed of a plurality of cantilever type displacement meters, and the cantilever type displacement meter has a plate-shaped strain that can be bent. A plate and a strain gauge for measuring the bending angle of the strain plate, one end of the strain plate being fixed to the front pipe or the rear pipe, and the other end of the strain plate being It is characterized by being formed in contact with the front pipe or the rear pipe.

  In the invention of claim 3, in the invention of claim 2, the front pipe and the rear pipe are each covered with a cylindrical outer pipe so as to form a double pipe structure, and the front pipe and the rear pipe The outer pipe is rotatably connected to each other, and the front pipe and the rear pipe are provided with weight members for suppressing the rotation of the front pipe and the rear pipe.

  According to a fourth aspect of the present invention, in the first to third aspects of the present invention, the joint detection means includes a moving image photographing device for photographing the upper side of the pipe.

  According to a fifth aspect of the present invention, the sensor pipe is attached to a pulling wire that passes through the pipe line.

  Furthermore, in invention of Claim 6, it is the pipe line linear measuring method between the embedding using the pipe line linear measuring apparatus of any one of Claims 1-4, Comprising: The said joint detection means WHEREIN: The said joint is detected by the said joint detection means. The position of the joint is aligned with the position of the joint, the front pipe and the rear pipe are aligned with each of the adjacent buried pipes via the joint, and the front pipe is And the bending direction and the bending angle of the rear pipe, the bending direction and the bending angle between the embedded pipes through the joint are determined from the bending direction and the bending angle of the front pipe and the rear pipe, and the bending direction of the embedded pipe and Provided is a pipeline linear measurement method for a buried pipe, wherein the bending angle is sequentially obtained for each of the joints to grasp the linearity of the whole buried pipe.

  According to a seventh aspect of the present invention, in the method of pushing in and inserting a new large-diameter pipe while destroying the existing small-diameter buried pipe, the pipe diameter of the small-diameter is previously set as the buried pipe of the sixth aspect. A method for indenting and inserting a large-diameter pipe, characterized by determining the possibility of indenting and inserting a large-diameter pipe by grasping by the pipe line linear measurement method.

  According to the first aspect of the present invention, the joint detecting means detects the joint of the buried pipe, and the front pipe and the rear pipe are bent along each of the adjacent buried pipes at the joint, and the bending direction of the front pipe and the rear pipe is Since the angle is measured by the bending detection means and the bending direction and the bending angle of the embedded pipe can be obtained from the measurement result, the alignment of the embedded pipe can be grasped with certainty.

  According to the invention of claim 2, since the bending detecting means is composed of a plurality of cantilever type displacement meters, it can measure the bending direction of the front pipe and the rear pipe with a simple structure and also measures the bending angle. it can. From these measurement results, it is possible to reliably measure the alignment of the buried pipe.

  According to the invention of claim 3, the front pipe and the rear pipe and the outer pipe covering the pipe are rotatably connected to each other, and the front pipe and the rear pipe have weight members for suppressing the rotation of these pipes. Provided. For this reason, the front pipe and the rear pipe that propel the pipeline of the cylindrical buried pipe can always maintain the same posture. Therefore, it is possible to reliably measure the bending direction of the buried pipe and accurately grasp the alignment of the whole buried pipe.

  According to the invention of claim 4, since the joint detection means is a video camera that photographs the upper side of the pipeline, even if foreign matter such as soil is mixed in the pipeline, these foreign matter is contained in the pipeline. Therefore, the position of the joint can be reliably detected. Therefore, the bending direction and the bending angle of the buried pipe can be reliably measured by the bending detection means, and the alignment of the entire buried pipe can be accurately grasped.

  According to the fifth aspect of the present invention, since the sensor pipe is attached to the pulling wire that is inserted through the pipe line, the pipe line can be pushed while pulling the sensor pipe with the pulling wire to measure the alignment of the buried pipe. Therefore, even if the sensor pipe is obstructed by a foreign substance or the like in the middle of the pipe, it can be pushed and pulled by the pulling wire, so that the alignment of the buried pipe can be reliably measured.

  According to the sixth aspect of the present invention, the joint position can be reliably detected by the joint detection means. In addition, by connecting the front pipe and the rear pipe along each of the adjacent buried pipes in the joint, the bending direction and the bending angle of the front and rear pipes for deriving the bending direction and the bending angle of the adjacent buried pipe are surely bent. It can be measured by detection means. By sequentially performing this operation, the bend angle direction between the buried pipes can be obtained based on the measurement result, and the linearity of the whole buried pipe can be accurately grasped by taking the pulling distance of the sensor pipe into consideration.

  According to the invention of claim 7, if the pipeline linear measurement method of the buried pipe of claim 6 is applied to a construction method in which a large-diameter pipe is pushed in while breaking a small-diameter buried pipe, By grasping the alignment of the buried pipe of the caliber, the possibility of pushing or pushing the large diameter pipe can be confirmed before construction. For this reason, depending on whether or not the push-in insertion / propulsion method for large-diameter pipes can be used, and where they cannot be used, other construction methods are applied to the unusable locations, or grooves are not used. It has the effect that a means, such as providing, can be taken.

  The present invention has a cylindrical sensor pipe that passes through a pipe line of an embedded pipe connected via a joint, and the sensor pipe measures the bending direction and the bending angle between the embedded pipes via the joint. A bending detection means for detecting the position of the joint is connected to the sensor pipe, and the sensor pipe is attached to a pulling wire passing through the pipe line. It is a pipeline linear measuring device of a buried pipe, and a pipeline linear measuring method using the same.

FIG. 1 is an overall configuration diagram of a buried pipe linear measuring apparatus according to the present invention.
As shown in the drawing, the buried pipe linear measuring device 1 according to the present invention is composed of a sensor pipe 3 and a joint detecting means 4 connected by a pulling wire 2. The sensor pipe 3 includes a front pipe 6 and a rear pipe 7 connected via a universal joint (a universal joint) 15. The pipeline linear measurement device 1 configured in this manner propels the buried pipe in the direction of arrow F (see FIG. 4).

2A and 2B are schematic configuration diagrams of the sensor pipe. FIG. 2A is a cross-sectional view, and FIGS. 2B and 2C are cross-sectional views taken along lines BB and CC of FIG.
The front pipe 6 and the rear pipe 7 are connected by a rod 14 connected by a universal joint 15. Therefore, the front pipe 6 and the rear pipe 7 can be freely bent via the universal joint 15. Therefore, even if the pipe line is bent at the joint portion of the buried pipe, it can be bent following the pipe line and propelled in the pipe line. The rod 14 is securely fixed by the rod support portion 13 disposed in the front pipe 6 and the rear pipe 7. The rod support portion 13 is provided with a through hole 12, and wiring and the like necessary for measurement are passed through the through hole 12.

  Between the front pipe 6 and the rear pipe 7, a cantilever type displacement meter 5 serving as a bending detection means is disposed. The cantilever type displacement meter 5 includes a plate-like strain plate 10 that can be bent and deformed, and a strain gauge 11 for measuring a bending angle of the strain plate 10, and the strain gauge 11 is attached to the strain plate 10. One end of the strain plate 10 is fixed to the mount 16 provided on the inner peripheral surface of the rear pipe 7 with screws 17 or the like. A projection 19 is formed at the other end of the strain plate 10, and this projection 19 abuts on a mount portion 18 provided on the inner peripheral surface of the front pipe 6. Thereby, even if the front pipe 6 and the rear pipe 7 are bent at the universal joint 15 portion, the strain plate 10 bends accordingly, and the bending displacement and the displacement amount can be detected by the strain gauge 11. For this reason, it is preferable that the strain gauge 11 measures a portion where the bending deformation of the strain plate 10 is large.

  A plurality of such cantilever type displacement gauges 5 are arranged between the front pipe 6 and the rear pipe 7 (four in the figure at four locations on the top, bottom, left and right of the inner circumference of the front pipe 6 or the rear pipe 7). As a result, no matter what direction the front pipe 6 and the rear pipe 7 are bent, the bending direction is measured based on the measurement result of each displacement meter 5 and the bending angle is determined by the displacement amount of each displacement meter. It can be measured. For this reason, it is preferable that three or more displacement meters 5 are arranged at equal intervals on the inner peripheral surfaces of the front pipe 6 and the rear pipe 7.

  The front pipe 6 and the rear pipe 7 are each covered with an outer pipe 20 via a bearing 21. Therefore, the front pipe 6 and the rear pipe 7 and the outer pipes 20 can rotate with respect to each other. A weight member 22 is attached to the lower side of the outer peripheral surface of the front pipe 6 and the rear pipe 7. In general, a cylindrical member entering the buried pipe propels the pipe line while rotating. Therefore, the cylindrical outer pipe 20 is also propelled while rotating in the buried pipe. However, the front pipe 6 and the rear pipe 7 provided on the inside are propelled while maintaining the same posture by the weight member 22. That is, even if the sensor pipe 3 is propelled in the pipeline, only the outer pipe 20 rotates and the front pipe 6 and the rear pipe 7 do not rotate. Accordingly, since the inside of the pipe can be propelled while the plurality of displacement meters 5 are always fixed at predetermined positions with respect to the traveling direction, the bending direction and the bending angle of the buried pipe can be reliably measured. .

  In the illustrated example, the strain pipe 10 is fixed to the rear pipe 7, but the cantilever type displacement meter 5 in which the strain plate 10 is fixed to the front pipe 6 is also applicable.

FIG. 3 is a cross-sectional view of the joint detection means 4.
As shown in the figure, the joint detection means 4 includes a moving image photographing device 25 such as a video camera in the inner pipe 24. The inner pipe 24 is covered with an outer pipe 26 and is formed so as to maintain the same posture by the same structure as the above-described front pipe 6 and rear pipe 7 and the outer pipe 20. That is, since the inner pipe 24 is attached via the outer pipe 26 and the bearing 21, the inner pipe 24 can be rotated with each other, and the weight member 22 is provided on the lower side of the outer peripheral surface. it can. Therefore, by attaching the photographing unit 27 such as a camera lens provided in the moving image photographing device 25 upward, it is possible to always photograph the upper side of the pipeline by the photographing unit 27 during the promotion in the pipeline. Therefore, even if foreign matter such as soil is accumulated in the pipe, the upper part of the buried pipe that is not affected by these foreign matters can be photographed, and the position of the joint of the buried pipe can be detected reliably. Further, in the above embodiment, the joint detecting means 4 is connected to the sensor pipe 3 by the pulling wire 2 as shown in FIG. 1, but is integrated with the sensor pipe 3 or attached to the sensor pipe 3. Also good.

FIG. 4 is a schematic configuration diagram sequentially showing the buried pipe linear measuring operation using the buried pipe linear measuring apparatus according to the present invention.
As shown to (A), the pipeline linear measuring apparatus 1 is propelled in the pipe line of the buried pipe 9 connected by the joint 8. This propulsion is performed by pulling the pulling wire 2 inserted through the buried pipe 9. Thus, by using the pulling wire 2, even if the sensor pipe 3 is obstructed by a foreign substance such as soil in the middle of the pipe, it can be pulled and propelled. A back tension wire may be provided behind the pipeline linear measurement device 1 in some cases.

  As shown in (B), when the joint detection means 4 propels up to the joint 8, the position of the joint 8 is detected by the video camera 25 (see FIG. 3). By setting the distance between the joint detecting means 4 and the sensor pipe 3 in advance, if the pulling wire 2 is pulled by the predetermined distance, the front pipe 6 and the rear pipe are located at the position where the joint 8 is detected as shown in FIG. The universal joint 15 provided between 7 can be matched. Thereby, the back tension wire of the pulling wire 2 can be loosened, and the front pipe 6 and the rear pipe 7 can be arranged so as to be parallel to the inner peripheral surfaces of the adjacent buried pipes 9 and 9 via the joint 8. . In this state, it is possible to reliably measure the bending direction and the bending angle of the front pipe 6 and the rear pipe 7 in the joint 8 portion using a cantilever type displacement meter which is a bending detection means. By repeating this operation for each joint 8 sequentially, the bend angle direction of the buried pipes can be obtained based on the measurement result, and the overall alignment of the buried pipe 9 can be accurately grasped.

  The outer diameter of the outer pipe 20 outside the front pipe 6 and the rear pipe 7 and the front pipe 6 so that the front pipe 6 and the rear pipe 7 can be surely parallel to the inner peripheral surface of the buried pipe in the joint 8. It is preferable that the distance from the rear pipe 7 is set appropriately in advance.

  In addition, the bending direction and angle of the front pipe 6 and the rear pipe 7 are set such that the outer diameter of the sensor pipe 3 (the outer pipe 20 outside the front pipe 6 and the rear pipe 7) with respect to the inner diameter of the buried pipe 9, It varies depending on the distance from the rear pipe 7. By predetermining the outer diameter of the sensor pipe 3 and the distance between the front pipe 6 and the rear pipe 7, the bending direction of the joint 8 of the buried pipe 7 and the bending direction of the embedded pipe 7 can be determined from the bending angle of the front pipe 6 and the rear pipe 7. The angle can be obtained by calculation. The predetermined outer diameter of the sensor pipe 3 and the distance between the front pipe 6 and the rear pipe 7 can follow the bending angle of the buried pipe 9 to be measured, and can be formed so that the bending direction and angle can be reliably measured at the joint 8. It is preferable to do. That is, the front pipe 6 and the rear pipe 7 need to have such a distance that the front pipe 6 and the rear pipe 7 can propel the pipeline even if the buried pipe 9 is bent and connected at the joint 8. In addition, even if the buried pipe 9 is bent and connected at the joint 8, the sensor pipe 3 needs to have a diameter enough to follow the front pipe 6 and the rear pipe 7.

FIG. 5 is a flowchart of the pipeline linear measurement method according to the present invention.
Step S1:
A pipeline linear measuring device is propelled into the pipeline of the buried pipe.
Step S2:
The position of the joint that connects the buried pipe is detected by the joint detection means.

Step S3:
A universal joint member that connects the front pipe and the rear pipe is aligned with the detected joint position, the front pipe and the rear pipe are aligned with each of the adjacent buried pipes via the joint, and the front pipe and the rear pipe are detected by the bending detection means. Measure the bending direction and angle.
Step S4:
From the bending direction and bending angle of the front pipe and the rear pipe measured in step S3, the bending direction and bending angle of the buried pipe are obtained by calculation.

Step S5:
Based on the calculation result in step S4, the pipeline alignment of the buried pipe is displayed on a monitor or the like. By repeating this step S1 to step S5 for each joint and further using data on the propulsion distance of the sensor pipe, the alignment of the entire buried pipe can be accurately grasped.

As described above, the pipeline linear measurement device and the measurement method of the buried pipe have been described, and these measurement devices and the measurement method are pushed and inserted into the large-diameter pipe while breaking the small-diameter buried pipe described above. In order to apply to the construction method, it is performed as follows.
First, after confirming the alignment of the entire buried pipe by, for example, confirming the joint position in the buried pipe with a small diameter in advance by using the measuring device of the present invention, the alignment capable of pushing the thick pipe, that is, the alignment of the thin pipe It is judged whether it is possible to propel even if a thick pipe is propelled as expected.
If it can be judged to be possible, the technology to push the thick pipe while destroying the thin pipe is applied, but if it is judged difficult, the application of another construction method can be considered or the difficult part can be opened. Take measures such as applying measures such as grooves and longitudinals and applying up to that point.
In any case, if this measurement device and measurement method are applied, it can be judged before construction work whether the construction method of pushing a thick pipe while breaking a thin pipe can be adopted. Plans can be easily constructed and construction costs can be reduced.

  The present invention can be applied to the measurement of pipeline alignment of various existing pipes.

1 is an overall configuration diagram of a buried pipe linear measurement device according to the present invention. It is a schematic block diagram of a sensor pipe, (A) is sectional drawing, (B), (C) is BB, CC sectional drawing of (A), respectively. It is sectional drawing of a joint detection means. It is a BB view of FIG. It is a flowchart figure of the pipeline linear measurement method which concerns on this invention.

Explanation of symbols

1: pipeline linear measuring device, 2: pulling wire, 3: sensor pipe, 4: joint detection means, 5: cantilever displacement meter, 6: front pipe, 7: rear pipe, 8: joint, 9: buried pipe, 10: strain plate, 11: strain gauge, 12: through hole, 13: rod support, 14: rod, 15: universal joint, 16: mount, 17: screw, 18: mount, 19: protrusion, 20: Outer pipe, 21: bearing, 22: weight member, 23: joint detection means, 24: inner pipe, 25: video camera, 26: outer pipe, 27: imaging unit

Claims (7)

A cylindrical sensor pipe that passes through a pipe line of an embedded pipe connected via a joint;
A pipe linear measurement device for a buried pipe having joint detection means for detecting the position of the joint connected to or installed in the sensor pipe,
The sensor pipe is composed of a front pipe and a rear pipe connected by a universal joint member,
The front pipe and the rear pipe can be bent along each of the adjacent buried pipes via the joints,
The sensor pipe is provided with a bending detection means for measuring the bending direction and the bending angle of the adjacent buried pipe through the joint according to the bending direction and the bending angle of the front pipe and the rear pipe. Pipe line linear measuring device for buried pipes.   The bending detection means is composed of a plurality of cantilever type displacement meters, the cantilever type displacement meter comprising a plate-shaped strain plate that can be bent and a strain gauge for measuring a bending angle of the strain plate. One end of the strain plate is fixed to the front pipe or the rear pipe, and the other end of the strain plate is formed in contact with the front pipe or the rear pipe. The pipe line linear measurement apparatus for buried pipes according to claim 1.   The front pipe and the rear pipe are each covered with a cylindrical outer pipe so as to form a double pipe structure, and the front pipe, the rear pipe and the outer pipe are rotatably connected to each other. The pipe linear measurement device for buried pipes according to claim 1, wherein a weight member for suppressing rotation of the front pipe and the rear pipe is provided.
The pipe linear measurement apparatus for buried pipes according to any one of claims 1 to 3, wherein the joint detection means is a moving picture camera that photographs the upper side of the pipe.   The pipe linear measurement apparatus for buried pipes according to any one of claims 1 to 4, wherein the sensor pipe is attached to a pulling wire that passes through the pipe path. A pipeline linear measurement method between buried pipes using the buried pipe pipeline linear measurement device according to any one of claims 1 to 4,
Confirm the position of the joint by the joint detection means,
Matching the universal joint member to the position of the joint, the front pipe and the rear pipe along each of the adjacent buried pipes through the joint,
The bending direction and the bending angle of the front pipe and the rear pipe are measured by the bending detection means,
Obtain the bending direction and bending angle between the buried pipes through the joint from the bending direction and bending angle of the front pipe and the rear pipe,
A method for measuring the linearity of a buried pipe, wherein the bending direction and the bending angle of the buried pipe are sequentially obtained for each of the joints and the linearity of the entire buried pipe is grasped.   In the construction method of pushing in and inserting a new large-diameter pipe while destroying an existing small-diameter buried pipe, the pipeline diameter of the small-diameter is previously grasped by the pipeline linear measurement method of the buried pipe according to claim 6. Therefore, the method for indenting and inserting a large-diameter pipe is characterized by determining the possibility of indenting and inserting a large-diameter pipe.

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