JP2021188471A - Method of constructing break induction part in pipeline - Google Patents

Abstract

To provide a rational method of constructing a break induction part for existing conduits connected to manholes.SOLUTION: There is provided a method for constructing a break induction part A at a preset position of a pipe B connected to a manhole C, including: a groove forming process of forming a groove on an inner peripheral surface at a position with a cutting tool; a groove depth measuring process of measuring a depth of the groove with a measuring tool; a primary diameter expansion process of arranging an elastic sleeve 3 and a metal sleeve 5 so as to be opposite to the groove, and applying force in a radial direction from the inside of the metal sleeve 5 to engage an inclined portion formed at the other end with each wedge temporarily fixed to one end; and a secondary diameter expansion process of moving the wedge temporarily fixed to the inclined portion formed on the metal sleeve 5 after the primary diameter expansion in a direction approaching each other. Preferably the method includes: a diameter measurement process of measuring the diameter in a circumferential direction at each location of a plurality of locations in a direction of laying a pipeline around the position; and a sealing material filling process of filling the groove with a sealing material 2 by a sealing material filling device.SELECTED DRAWING: Figure 1

Description

The present invention relates to a construction method for forming a rupture guiding portion with respect to an existing pipeline connected to a manhole.

In the existing sewerage pipeline, the pipeline may be bent due to the influence of land subsidence or an earthquake, or the pipes constituting the pipeline may be damaged such as cracks or breaks. If the sewerage pipeline is damaged, groundwater will flow from this damaged part, which not only imposes a heavy burden on the treatment equipment on the downstream side, but may also cause land subsidence and road collapse. Therefore, it is necessary to repair it promptly. In particular, if the sewerage pipeline is damaged during an earthquake, the sewage itself in houses and offices becomes unusable, so it is necessary to promptly investigate and repair the damaged part. However, it takes time and time to investigate the damaged part, and a large cost is required.

Recently, in the case of a new pipeline, a flexible joint is provided in advance at the pipe opening. Further, in the case of an existing pipeline, a guide joint consisting of a groove is formed on the inner peripheral surface of a predetermined portion of the pipe constituting the pipeline, and the starting point of damage is artificially guided to this guide joint to absorb the seismic motion. Seismic measures are being implemented to protect the pipeline.

If the pipeline is damaged starting from the guide joint, it is necessary to prevent groundwater from entering the pipeline from this damaged part. Therefore, by arranging the elastic sleeve facing the guide joint and pressing the elastic sleeve against the inner peripheral surface of the pipeline with a metal sleeve having high strength, the infiltration of groundwater from the guide joint can be prevented. (See, for example, Patent Document 1).

Then, the guide joints formed in the pipes constituting the pipeline, the sealing material filled in the guide joints, the elastic sleeves and the metal sleeves arranged facing the guide joints, etc., cause the fracture that becomes the starting point of the fracture of the pipeline. The guide part is configured.

JP-A-2019-0994959

When a rupture induction part is formed in an existing pipeline connected to a manhole, a groove serving as a guide joint is newly formed on the inner peripheral surface of the pipe, and an elastic sleeve and a metal sleeve are arranged on the inner peripheral surface side of this groove. It is necessary to carry out a series of work including the expansion of the diameter.

In particular, in an existing pipeline that has been laid for a long period of time, the pipe that constitutes the pipeline may be deformed by a force acting from the outside. In such a pipeline, even if a groove is formed on the inner peripheral surface of the pipe, the depth of the groove in the circumferential direction may not be uniform, and it may be difficult to reliably function as a guide joint. Occurs.

Further, in a pipeline in which the inner diameter in the laying direction fluctuates, the peripheral length of the portion where the metal sleeve should be placed differs, and the elastic sleeve is pressed against the inner peripheral surface of the pipe due to the expansion of the diameter of the metal sleeve. May become non-uniform.

Therefore, the actual situation is that the development of a construction method capable of rationally performing a series of operations for constructing the fracture induction portion is required.

An object of the present invention is to provide a rational construction method for forming a fracture guiding portion for an existing pipeline connected to a manhole.

In order to solve the above problems, the method of constructing a breakage guiding portion in a typical pipeline according to the present invention is for constructing a breakage guiding portion at a preset position in a pipeline connected to a manhole. In this construction method, a cutting tool is placed at a preset position in the pipeline, and the cutting tool cuts the inner peripheral surface of the pipeline while cutting the cutting portion along the inner peripheral surface of the pipeline. In addition, a groove forming step of forming a groove on the inner peripheral surface by moving the entire circumference and a measuring tool for measuring the depth of the groove facing the groove formed on the inner peripheral surface are arranged. A groove depth measuring step of inserting the measuring tool into a groove to measure the depth, extracting the metal from the groove, and moving the measuring instrument in the circumferential direction to measure the depth of a plurality of positions of the groove, and measuring the depth. An elastic sleeve and a metal plate having inclined portions formed at both ends in the width direction are wound around the inner diameter side of the elastic sleeve so as to face the groove, and both ends in the length direction are overlapped with each other and the overlapped portion. A metal sleeve with a wedge temporarily fixed to each of the inclined portions formed at one end in the circumferential direction and at both ends in the width direction is arranged, and the metal sleeve is placed at a plurality of positions in the radial direction from the inside of the metal sleeve at substantially the same time. The primary diameter expansion step of engaging the inclined portion formed at the other end with each wedge temporarily fixed to one end in the circumferential direction by applying a force, and the circumference of the metal sleeve for which the primary diameter expansion has been completed. The metal sleeve is secondarily expanded by moving the respective wedges temporarily fixed to the inclined portions formed at one end in the direction and at both ends in the width direction toward each other along the inclined portions. It is characterized by including a secondary diameter expansion step of pressing the elastic sleeve against the inner peripheral surface of the conduit.

In the method of constructing the rupture guiding portion in the pipeline according to the present invention, a series of operations for constructing the rupture guiding portion at a preset position in the existing pipeline connected to the manhole can be rationalized. You can proceed.

That is, in the groove forming step, a cutting tool is arranged at a position preset in the pipeline, and the cutting tool can form a groove over the entire inner peripheral surface of the pipeline. Then, in the groove depth measuring step, by inserting a measuring tool for measuring the groove depth into the groove and measuring the actual depth of the groove, the formed groove is sufficient as a guide joint as a starting point of fracture. It can be confirmed that the depth is high.

In the primary diameter expansion step, the elastic sleeve and the metal sleeve are arranged so as to face the groove filled with the sealing material, and the primary diameter can be expanded from the inside of the metal sleeve. Then, in the secondary diameter expansion step, the diameter is expanded again from the inside of the metal sleeve, so that the elastic sleeve can be pressed against the inner peripheral surface of the pipeline by the expanded diameter metal sleeve.

It is a figure explaining the relationship between an existing pipeline, a manhole, and a rupture induction part. It is a figure explaining the process which constitutes the fracture induction part. It is a figure explaining the structure of the fracture induction part. It is a figure explaining the structure of the apparatus which measures a diameter. It is a figure explaining the structure of a push-in rod. It is a figure explaining the structure of the bogie and the structure of the groove forming apparatus attached to this bogie. It is a figure explaining the structure of the groove depth measuring apparatus attached to a trolley. It is a figure explaining the structure of the seal material filling device attached to a trolley. It is a figure explaining the structure of the metal sleeve in the initial state. It is a figure explaining the structure of the primary diameter expansion apparatus. It is a figure explaining the metal sleeve which finished the primary diameter expansion. It is a side view explaining the structure of the secondary diameter expansion device attached to a trolley. It is a top view explaining the structure of the secondary diameter expansion device attached to a trolley. It is a figure explaining the metal sleeve which finished the secondary diameter expansion.

The method of constructing a rupture guide portion in a pipeline according to the present invention is a method of constructing a rupture guide portion at a preset position of an existing pipeline connected to a manhole. In particular, even when the pipes constituting the pipeline are deformed, it can surely become the starting point of rupture when an excessive force is applied, for example, at the time of an earthquake, and the rupture occurs. It is a construction method for constructing a rupture induction part that can prevent the intrusion of groundwater even at any time.

The configuration position of the fracture guiding portion in the pipeline is not particularly limited. However, since the pipeline is an existing pipeline connected to the manhole, it is preferable that the pipeline is close to the pipe opening of the pipeline connected to the manhole. That is, it is possible to form a groove on the inner peripheral surface of the pipe line and arrange an elastic sleeve or a metal sleeve so as to face the groove, which is preferable. Then, by breaking the pipe line at a position close to the pipe mouth, the pipe line and the manhole can be separated. Therefore, both can move individually without restraining each other.

Hereinafter, a method of constructing a breakage guiding portion in the existing pipeline connected to the manhole according to the present embodiment will be described. FIG. 1 shows a pipe B (hereinafter referred to as a pipe) constituting the existing pipeline connected to the manhole C. It is a figure explaining the structure of the breakage guiding part A configured in (referred to as "pipe B") on behalf of a road or a pipe which constitutes a pipe line.

As described above, the position of the fracture guiding portion A with respect to the pipe B is not particularly limited, but since the pipe B has already been laid, the pipe B is connected to the manhole C. It is preferably near the mouth D. By configuring the fracture guiding portion A in the vicinity of the pipe opening D of the manhole C, it is possible to easily perform the work of constructing the fracture guiding portion A and the work of repairing the broken pipe B. .. Further, it becomes possible to manage the breaking position of the pipe B. For example, when an excessive force is applied at the time of an earthquake, the pipe B breaks from the breakout guiding portion A to separate the pipe B and the manhole C. Is possible.

In particular, when the pipe B is laid by the propulsion method, a shaft for installing a propulsion device and carrying out propulsion work is constructed. The plane dimension of this shaft is generally larger than the outer diameter of the manhole C, and after installing the manhole C using the shaft and connecting the pipe B to the manhole C, the space formed on the outer circumference is formed. Filling with concrete E is performed together with the connected pipe B.

In such a pipeline B, the rupture guiding portion A is configured at a position avoiding the portion of the concrete E, and the work for forming the rupture guiding portion A may not be performed from the Kanguchi. Therefore, in this embodiment, the device used when carrying out each step is configured to be operable from Sugaguchi D as described later.

The fracture guiding portion A is configured in both the inflow side pipe B and the outflow side pipe B connected to the manhole C. explain.

The fracture guiding portion A includes a groove 1 formed over the entire inner peripheral surface of the pipe B, a sealing material 2 filled in the groove 1, an elastic sleeve 3 arranged facing the groove 1, and an elastic sleeve. It is configured to have a metal sleeve 5 which is arranged on the inner surface side of the 3 and presses the elastic sleeve 3 against the inner peripheral surface of the pipe B.

The groove 1 is a starting point of breakage of the pipe B, for example, when an excessive force acts on the pipe B at the time of an earthquake. The width dimension of the groove 1 is not particularly limited, but it is necessary to have a depth capable of surely becoming a starting point of fracture. Such a depth needs to be a dimension that can surely cut the reinforcing bar embedded in the pipe B, and is appropriately set according to the diameter of the pipe B.

The pipe B connected to the manhole C may be deformed with a long period of use. When the diameter in the laying direction changes due to the deformation of the pipe B and the circumference also changes, it is difficult to sufficiently press the elastic sleeve 3 against the pipe B even if the diameter of the metal sleeve 5 is expanded. May become. Therefore, for the pipe B that has been used for a long period of time, it is preferable to measure the diameter of the pipe B in the laying direction and to manufacture and apply the metal sleeve 5 having a circumference corresponding to the measured diameter.

It may not be necessary to measure the diameter of the pipe B whose use period is short and the pipe diameter does not change, or the pipe B whose diameter is known in advance.

In the diameter measuring step, as shown in FIG. 2A, at least two positions 1b are centered on the position 1a preset for forming the groove 1 and include the position 1a on the upstream and downstream sides in the laying direction. 1c is set, and the diameter of the tube B at the positions 1a to 1c is measured. The distance between the position 1b and the position 1c has a dimension substantially equal to or slightly shorter than the length of the elastic sleeve 3 and the metal sleeve 5 (the length in the laying direction of the pipe B).

By measuring the diameters 1ad to 1cd at a plurality of positions by changing the angle in the circumferential direction at each of the positions 1a to 1c, it is possible to know the change in the diameter in the circumferential direction at each position 1a to 1c. be. Then, it is possible to set the required cutting depth when forming the groove 1 from the large-diameter dimension and the small-diameter dimension at the position 1a.

Further, the average diameter at positions 1b and 1c is calculated, the circumference at positions 1b and 1c is calculated, and the dimensions of both ends of the metal sleeve 5 in the length direction are set based on the calculated circumference. It is possible to do. By manufacturing the metal sleeve 5 based on the diameter of the pipe B in this way, when the metal sleeve 5 is secondarily expanded in diameter in the step described later, the elastic sleeve 3 can be reliably pressed against the pipe B. ..

The work of measuring the diameter of the pipe B can be performed by the worker directly inside the pipe B. However, when the tube B has a small diameter and a person is not allowed to enter the tube B, a measuring device is inserted from the tube port D for measurement. The measuring device used in this way is not particularly limited, but it is preferable to use the measuring device 10 as shown in FIG.

The measuring device 10 shown in FIG. 4 has a frame 11 in which a plurality of rollers that can rotate in all directions (not shown) are arranged around the measuring device 10. At one end of the frame 11, a support frame 12 rotatably configured around an axis substantially coincident with the axis of the tube B is arranged in a cantilever shape, and a diameter measuring member 13 is placed at a predetermined position. Have been placed.

The support frame 12 is formed in a bow shape or a U shape, and one end of the bow shape is rotatably supported by the frame 11. Further, a case 14 (hereinafter, simply referred to as “camera 14”) containing a camera for monitoring the inner peripheral surface of the tube B and the entire measuring device 10 is arranged at the free end on the other side. Therefore, regardless of the posture of the frame 11, the support frame 12 always takes a vertical posture, and the vertical direction of the image of the camera 14 coincides with the vertical direction.

The diameter measuring member 13 has a cylinder 13a attached to the frame 11, a pair of contacts 13b that expand and contract with the operation of the cylinder 13a, and a scale 13c that displays the distance between the pair of contacts 13b. The scale 13c is monitored by a camera 15 provided on the frame 11 so that the diameter can be measured.

In particular, a connecting member 16 for attaching the push rod 17 shown in FIG. 5 is formed in a protruding shape at the end portion of the frame 11 opposite to the end portion to which the support frame 12 is attached. The connecting member 16 is configured so that the push rod 17 can be inserted and connected, and a connecting member 16a such as a plunger, which can be connected to and disconnected from the push rod 17 at a predetermined position, is arranged. Has been done.

The push rod 17 is configured to have a main body portion in which a plurality of rod-shaped bodies 17a having a unit length are connected in the longitudinal direction, and a handle 17b attached to one end of the main body portion in a T-shape. Holes 17c are formed at predetermined positions of the rod-shaped bodies 17a constituting the main body of the push rod 17, and the holes 17c are connected to the connecting member 16 of the frame 11 so as to be integrated. It is configured. Further, a scale 17d as a guideline for the indentation length is formed on the side surface of the rod-shaped body 17a, and it is possible to know the indentation length in the pipe B by the scale 17d.

Then, the measuring device 10 is pushed into any of the positions 1a to 1c set in the pipe B by the push rod 17, and the cylinder 13a is operated at that position to bring the pair of contacts 13b to the inner peripheral surface of the pipe B. It is possible to measure the diameter by contacting and reading the scale 13c. After that, the measuring device G can be rotated by a predetermined angle in the circumferential direction by the push rod 17, and the diameter at this rotation position can be measured.

By repeating the above operation for each position, it is possible to measure the diameters of the preset positions 1a to 1c. Then, the depth of the groove 1 formed at the position 1a can be set according to the diameter of the tube B at the measured position 1a and used as a reference when proceeding with the next process. Further, depending on the diameter of the pipe B at the positions 1b and 1c, it is possible to set the width dimension of both ends of the metal sleeve 5 corresponding to these positions 1b and 1c in the length direction.

After measuring the diameter of the pipe B at the preset positions 1a to 1c in the diameter measuring step described above, the process proceeds to the groove forming step of forming the groove 1 at the position 1a as shown in FIG. 2 (b). As described above, the width dimension of the groove 1 is not limited, but it is necessary to have the strength necessary for cutting the concrete layer and the reinforcing bar of the pipe B.

The means for forming the groove 1 in the pipe B is not particularly limited, and a groove having a predetermined depth, that is, a groove having a depth capable of cutting the reinforcing bar embedded in the pipe B is formed over the entire circumference of the inner peripheral surface. It is good if it is possible to do it. As such means, there are those using a rotating blade, those that inject high-pressure water, and the like, and any of them can be used.

In this embodiment, as shown in FIG. 6, the groove 1 is formed at the preset position 1a by the groove forming device 30 mounted on the carriage H configured to run inside the pipe B. There is.

First, the configuration of the carriage H will be described. The carriage H has two traveling members 20 and 21 provided with a plurality of rollers 20a and 21a, respectively, and is configured such that the bow-shaped frame 22 is rotatably supported by these traveling members 20 and 21. ing.

A drive motor 22a for rotating the bow-shaped frame 22 is arranged on one of the traveling members 20 of the carriage H. Further, a connecting member 20b for connecting the push rod 17 is formed in a protruding shape on the traveling member 20. The connecting member 20b is configured so that the push rod 17 can be inserted and connected, and a connecting member 20c such as a plunger, which can be connected to and disconnected from the push rod 17 at a predetermined position, is arranged. Has been done.

Since the movement of the trolley H in the pipe B is performed by using the push rod 17, the description thereof will be omitted when the trolley H is used in the following embodiment or when the same moving member is used.

A camera case 23a (hereinafter referred to as "camera 23a") containing a camera for photographing the inside of the tube B is arranged on the other traveling member 21. The camera 23a is attached to one end of a support frame 23 formed in a bow shape. Further, the other end of the support frame 23 is rotatably supported by the rotation support portion 21b provided on the traveling member 21. The support frame 23 is arranged so as to project like a cantilever with respect to the traveling member 21. Therefore, the support frame 23 is arranged on the side opposite to the side where the bow-shaped frame 22 is arranged in the traveling member 21.

In particular, since the camera 23a and the rotation support portion 21b are arranged on substantially the same axis (preferably the central axis of the tube B) and the support frame 23 is formed in a bow shape, the support frame The portion of the 23 that becomes the bow is always below the axis. Therefore, similarly to the support frame 12 and the camera 14 described above, the vertical direction of the image of the camera 23a coincides with the vertical direction regardless of whether or not the carriage H is tilted in the circumferential direction.

Outriggers 24 are arranged on the two traveling members 20 and 21, respectively. The outriggers 24 are arranged on the surface opposite to the surface on which the rollers 20a and 21a are provided, and when these outriggers 24 are operated, the bogie H is connected to the pipe B in cooperation with the rollers 20a and 21a. It can be fixed to the inner peripheral surface.

The bow-shaped frame 22 has shaft portions 22a and 22b formed on the same rotation axis at both ends in the longitudinal direction, and is based on a position between these shaft portions 22a and 22b and eccentric from the rotation axis. The base portion 22c is formed. The shaft portion 22a is rotatably supported by the rotation support member 25a formed on one traveling member 20, and the shaft portion 22b is rotatably supported by the rotation support member 25b formed on the other traveling member 21. There is.

Therefore, the bow-shaped frame 22 is configured to rotate around the shaft portions 22a and 22b at both ends, and the base portion 22c can rotate eccentrically with this rotation. Therefore, when the carriage H is installed in the pipe B, the rotation axis can be substantially aligned with the axis of the tube B, so that the bow-shaped frame 22 can be rotated so as to be substantially aligned with the axis of the tube B. Become.

An elevating member 26 is arranged on the base portion 22c of the bow-shaped frame 22, and a mounting seat 27a is arranged on the elevating member 26. The elevating member 26 raises and lowers the mounting seat 27a to bring the device (for example, the groove forming device 30) attached to the mounting seat 27a closer to or separated from the inner peripheral surface of the pipe B. The elevating member 26 is composed of a pantograph type jack. The elevating member 26 has a fixed piece 26a fixed at a predetermined position on the traveling member 20 side of the base portion 22c of the bow-shaped frame 22, and a moving piece 26b on which a female screw (not shown) is formed on the traveling member 21 side. Is placed. A pair of link pieces 26c are rotatably attached to each of the fixed piece 26a and the moving piece 26b. The mounting seat 27a is attached to the end side of the link piece 26c facing the fixed piece 26a, and the sliding piece 27b is attached to the end side facing the moving piece 26b.

Further, an elevating motor 28 to which an elevating screw 28a is attached is arranged on the base portion 22c. The elevating screw 28a is screwed into a female screw formed on the moving piece 27b, and the tip portion thereof is rotatably supported with respect to the fixing piece 26a. Therefore, when the elevating motor 28 is rotated in a desired direction, the mounting seat 27a and the sliding piece 27b move up and down with this rotation. At this time, the mounting seat 27a moves up and down substantially linearly in the radial direction of the pipe B, but the sliding piece 27b is combined with the movement of the pipe B in the pipe axial direction in response to the raising and lowering of the pipe B in the radial direction. .. Therefore, the device to be attached to the trolley H is fixed to the attachment seat 27a and placed on the sliding side 27b, and the elevating member 26 is operated so that the attached feeding can be substantially linearly linear in the radial direction of the pipe B. It can be raised and lowered.

Further, a camera 29 is arranged at a predetermined position of one of the traveling members 20, and together with the above-mentioned camera 23a, the position of the carriage H in the pipe B, the attached device, and the progress of the work are confirmed. It is configured to be possible.

The trolley H configured as described above can be used as a common trolley H when advancing some processes described later.

The groove forming device 30 has a cutting tool 31 having a preset width (thickness) for forming a groove on the inner peripheral surface of the pipe B, and a drive motor 32 for driving the cutting tool 31. , The drive motor 32 is attached to the base plate 33. One end side of the base plate 33 is fixed to the mounting seat 27a of the elevating member 26, and the other end side is placed on the sliding piece 27b.

The procedure for forming the groove 1 on the inner peripheral surface of the pipe B by the groove forming device 30 configured as described above will be described. First, the carriage H having the groove forming device 30 attached to the mounting seat 27a is driven to the position 1a set in the pipe B, and then fixed to the inner peripheral surface by the outrigger 24. After that, the base plate 33 is raised by the elevating member 26 to bring the cutting tool 31 closer to the inner peripheral surface of the pipe B, and the cutting tool 31 is rotated by the drive motor 32 to cut the inner peripheral surface of the pipe B. Start. Then, by driving the drive motor 22a arranged on the traveling member 20 to rotate the bow-shaped frame 22, a groove 1 is formed on the inner peripheral surface of the pipe B over the entire circumference. Further, by raising the base plate 33 by the elevating member 26 with the rotation of the bow-shaped frame 22, it is possible to form a groove having a desired depth on the inner peripheral surface of the pipe B.

After forming a groove 1 having a predetermined depth on the inner peripheral surface of the pipe B as described above, the elevating member 26 is operated to lower the mounting seat 27a to separate the cutting tool 31 of the groove forming device 30 from the groove 1. Let me. After that, the carriage H is pulled out from the pipe B to the manhole C, the groove forming device 30 is removed from the mounting seat 27a, and the process proceeds to the next depth measurement step.

The subsequent depth measuring step is a step of measuring the depth di of the groove 1 formed in the groove forming step, as shown in FIG. 2 (c). Then, from the measured depth di of the groove 1, it is determined that the pipe B can be reliably broken when an excessive force is applied to the pipe B, for example, during an earthquake. That is, when the pipe B is deformed, the depth di fluctuates in the circumferential direction of the groove 1, so it is necessary to measure the depth di of the groove 1.

The means for measuring the depth di of the groove 1 is not limited, and any means may be used as long as the groove 1 is near the pipe opening D of the manhole C and can be measured by the operator's hand. However, when it is far from the pipe opening and cannot be measured by an operator, it is preferable to use the groove depth measuring device 35 shown in FIG. 7.

The depth measuring device 35 shown in the figure is attached to the mounting seat 27a of the carriage H described above. That is, the depth measuring device 35 has a scale 37 that stands up at a predetermined position of the base plate 36 attached to the mounting seat 27a via a spring 37a and a scale 37 that is arranged facing the scale 37 and stands up via the spring 38a. It is configured to have a camera 38.

A procedure for measuring the depth of the groove 1 by the depth measuring device 35 configured as described above will be described. First, while checking the images of the cameras 23a and 29 arranged on the trolley H and the camera 38 of the depth measuring device 35, the trolley H is made to run in the pipe B so that the scale 37 faces the groove 1. The outrigger 24 is operated at this position to fix the carriage H to the pipe B.

The elevating member 26 is operated to insert the scale 37 into the groove 1, and the depth of the groove 1 at that position is measured from the image taken by the camera 38. After that, the elevating member 26 is operated to separate the scale 37 from the groove 1, the arcuate frame 22 is rotated by a predetermined angle by the drive motor 22a, and the above-mentioned work is repeated to measure the depths of the plurality of positions of the groove 1. do. Then, from the result of measuring the depth of the groove 1 at a plurality of positions, it is examined whether or not the formed groove 1 can exert a function as a guide joint of the pipe B.

As a result of the examination, if the function as the guide joint cannot be exhibited, the groove 1 is cut again by the cutting tool 31. When the groove 1 can function as a guide joint, the process proceeds to the next sealing material filling step. It is not essential to fill the groove 1 with the sealing material 2, and the groove 1 may be proceeded to the primary diameter expansion step without filling the groove 1.

As shown in FIG. 2D, the sealing material filling step is a step of filling the sealing material 2 in the groove 1 formed on the inner peripheral surface of the pipe B. In this step, the specifications of the sealing material to be filled in the groove 1 are not limited, and the means for filling the sealing material 2 is not limited. When the groove 1 is close to the pipe opening D of the manhole C, the worker may operate the sealing material filling nozzle 41 to fill the groove 1. However, when the groove 1 is far from the pipe opening D and the filling operation from the pipe opening D is not easy, it is preferable to use the sealing material filling device 40 shown in FIG.

The sealing material filling device 40 shown in the figure is attached to the mounting seat 27a of the carriage H described above. That is, in the sealing material filling device 40, the filling gun 43 having the sealing material filling nozzle 41 is arranged on the base plate 42 attached to the mounting seat 27a. Further, a plurality of cameras 44 are arranged around the sealing material filling nozzle 41, and the sealing material filling nozzle 41 reaches the position facing the groove 1 by these cameras 44, and the sealing material 2 with respect to the groove 1. It is configured so that the filling status of the can be confirmed.

A procedure for filling the groove 1 with the sealing material 2 by the sealing material filling device 40 configured as described above will be described. First, while checking the images of the cameras 23a and 29 arranged on the trolley H and the camera 44 of the sealing material filling device 40, the trolley H is run in the pipe B and the sealing material filling nozzle 41 faces the groove 1. Let me. The outrigger 24 is operated at this position to fix the carriage H to the pipe B.

The elevating member 26 is operated to approach or insert the sealing material filling nozzle 41 into the groove 1, and the filling gun 43 is operated to fill the groove 1 with the sealing material 2. The filling status of the sealing material 2 in the groove 1 is confirmed by an image taken by the camera 44. Then, the groove 1 is filled with the sealing material 2 by rotating the bow-shaped frame 22 by the drive motor 22a while continuing to fill the groove 1 with the sealing material filling nozzle 41. After the filling of the sealing material 2 in the groove 1 is completed, the elevating member 26 is operated to separate the sealing material filling nozzle 41 from the groove 1 and the sealing material filling device 40 is separated from the pipe B to expand the next primary diameter. Proceed to the process.

In the primary diameter expansion step, after the groove 1 is filled with the sealing material 2, as shown in FIG. 4, the elastic sleeve 3 and the metal sleeve 5 are opposed to the groove 1 and the metal sleeve 5 is expanded in diameter. This is a step of bringing the elastic sleeve 4 into contact with the inner peripheral surface of the tube B.

The elastic sleeve 3 has a function of preventing the infiltration of groundwater from the groove 1 when the pipe B breaks from the groove 1. Therefore, the elastic sleeve 3 has a length sufficiently larger than the width dimension of the groove 1 (the length in the laying direction of the pipe B), and the outer peripheral surfaces at both ends in the length direction (inside the pipe B). A plurality of ribs are formed in a protruding shape on the surface facing the peripheral surface). The elastic sleeve 3 is made of elastic rubber or synthetic resin.

The metal sleeve 5 is arranged on the inner peripheral surface side of the elastic sleeve 3, and has a function of pressing the elastic sleeve 3 against the inner peripheral surface of the pipe B by expanding the diameter by an external force. Therefore, the metal sleeve 5 is always exposed to the fluid flowing through the tube B. Therefore, the metal sleeve 5 is made of a stainless steel plate having excellent corrosion resistance or a rust-preventive steel plate.

The structure and shape of the metal sleeve 5 are not particularly limited. However, it is preferable to use the metal sleeve 5 configured as shown in FIG. FIG. 9 shows the metal sleeve 5 in the initial state before the diameter is expanded. In the figure, the metal sleeve 5 has a length substantially equal to the length of the elastic sleeve 4, and both ends in the longitudinal direction are the diameters of positions 1b and 1c measured in the diameter measuring step and the elastic sleeve 3 respectively. It has dimensions that correspond to dimensions such as thickness.

The metal sleeves 5 are overlapped with each other so that the peripheral end portions 5a intersect with each other, and inclined portions 5b are formed at both end portions of the end portions 5a in the longitudinal direction. Further, wedges 6 are arranged on the inclined portions 5b of one end portion 5a, respectively, and are temporarily fixed by shear pins 7. The wedge 6 is formed with a groove 6a having a bottom portion 6b having an inclination angle equal to that of the inclined portion 5b formed on the metal sleeve 5. In particular, since a large force is required to expand the diameter of the metal sleeve 5, it is necessary to use a device capable of exerting a mechanical force.

The elastic sleeve 3 and the metal sleeve 5 configured as described above are prepared in a state of being overlapped in advance. Then, after being mounted on the outer periphery of the diameter-expanding member 51 of the primary diameter-expanding device 50 shown in FIG. 10 and arranged at a position facing the groove 1 in the pipe B, the primary diameter is expanded.

Therefore, the primary diameter expanding device 50 includes a diameter expanding member 51 that expands and contracts in the radial direction to expand the diameter of the metal sleeve 5 together with the elastic sleeve 3, and an elevating member 52 that raises and lowers the diameter expanding member 51 in the radial direction of the pipe B. A pair of moving members 53a and 53b mounted on the elevating member 52 and configured to be movable, and a support frame 54 formed in a cantilever shape from one of the moving members 53a and having a camera 54a attached to a free end. It is configured to have an elevating motor 55 arranged on the other moving member 53b and connected to the elevating member 52 via a screw 55a.

The diameter-expanding member 51 has a plurality of diameter-expanding elements 51a that move up and down in the radial direction centered on the screw 55a. It has a link piece 52a connected to. Further, one end of the screw 55a is screwed into a female screw 55b formed on the moving member 53a, and the moving members 53a and 53b are brought closer to each other as the elevating motor 55 rotates to raise the expander 51a or the moving member. The diameter expander 51a is configured to be lowered by separating the 53a and 53b.

In the primary diameter expanding device 50 configured as described above, the elastic sleeve 3 and the metal sleeve 5 overlapped with the diameter expanding member 51 are inserted to face the groove 1, and then the elevating motor 55 is driven to drive the screw 55a. The moving members 53a and 53b approach each other as they rotate. As the moving members 53a and 53b approach each other, the elevating member 52 raises a plurality of expanders 51a in the radial direction to expand the diameter of the metal sleeve 5.

In the metal sleeve 5, both ends 5a are separated from each other as the diameter is expanded, and as shown in FIG. 11, the other end of the metal sleeve 5 is formed in the groove 6a of the wedge 6 temporarily fixed to any of the ends 5a. When 5a is fitted, the primary diameter expansion is completed. At this time, the wedge 6 holds the temporarily fixed state to the metal sleeve 5 via the shear pin 7. The end of the primary diameter expansion can be confirmed by the image of the camera 54a and at the same time by the sound emitted when the other end 5a fits into the groove 6a of the wedge 6.

When the primary diameter expansion is completed, the elastic sleeve 3 and the metal sleeve 5 are in contact with the inner peripheral surface of the pipe B, and even if the elevating motor 55 is driven and the elevating member 52 lowers the diameter expanding member 51, the pipe is used. The state of contact with the inner peripheral surface of B is maintained. Then, the primary diameter-expanding device 50 in which the diameter-expanding member 51 is lowered is detached from the pipe B, and the process proceeds to the next secondary diameter-expanding step.

The secondary diameter expansion step is a step of further expanding the diameter of the metal sleeve 5 for which the primary diameter expansion has been completed and pressing the elastic sleeve 3 against the inner peripheral surface of the pipe B. By pressing the elastic sleeve 3 against the inner peripheral surface of the pipe B in this way, for example, even if the pipe B breaks from the groove 1 at the time of an earthquake and the groundwater infiltrates, the infiltrated groundwater flows into the pipe B. It is possible to prevent that,

The secondary diameter expansion of the metal sleeve 5 is to move the pair of wedges 6 in a direction in which they approach each other so that the bottom portion 6b of the wedge 6 and the inclined portion 5b of the metal sleeve 5 are brought into contact with each other while the end portion of the metal sleeve 5 is brought into contact with each other. 5a are separated from each other to expand the diameter. When the pair of wedges 6 are moved in the direction of approaching each other, the shear pins 7 temporarily fixing the respective wedges 6 are sheared.

The structure of the device used for secondary diameter expansion of the metal sleeve 5 is not limited, and for example, the diameter expansion device described in Patent Document 1 can be used. However, it is also possible to use the secondary diameter expanding device 60 shown in FIGS. 12 and 13. The secondary diameter expanding device 60 can utilize the carriage H common to the groove forming device 30, the depth measuring device 35, and the sealing material filling device 40 described above. Therefore, it is advantageous in advancing a series of steps for forming the fracture guiding portion A in the pipe B.

The secondary diameter expansion device 60 shown in the figure is a device that further expands the diameter of the metal sleeve 5 for which the primary diameter has been expanded, and performs secondary diameter expansion in which the elastic sleeve 3 is pressed against the inner peripheral surface of the pipe B. Is. Therefore, the secondary diameter expansion measure 60 includes a pair of contact pieces 61, a reciprocating drive member 62 that separates or brings the contact pieces 61 away from each other, and a guide member 63 that guides the moving direction of the contact pieces 61. The guide member 63 is attached to the base plate 64. Further, two cameras 65 are arranged at predetermined positions of the base plate 64. Then, one end side of the base plate 64 is fixed to the mounting seat 27a of the elevating member 26 constituting the carriage H, and the other end side is placed on the sliding piece 27b. The structure of the reciprocating drive member 62 is not particularly limited, but a hydraulic cylinder is preferable.

In the secondary diameter expanding device 60 configured as described above, with the pair of contact pieces 61 sufficiently separated from each other, the contact piece 61 is larger than the inner diameter of the metal sleeve 5 whose primary diameter is expanded by the elevating member 26. The height is set low, and the carriage H is moved to the inside of the metal sleeve 5 in this state. Next, without operating the outrigger 24, the elevating member 26 is operated to make each contact piece 61 face the wedge 6.

After that, when the reciprocating drive member 62 is operated to bring the abutting pieces 61 closer to each other, the abutting pieces 61 abut on the wedge 6, and the shear pin 7 shears as the abutting piece 61 further approaches. The wedge 6 continues to approach each other. Along with this approach, the bottom portion 6b of the wedge 6 and the inclined portion 5b of the metal sleeve 5 rub against each other, and the diameter of the metal sleeve 5 is expanded. Then, as shown in FIG. 14, when the diameter of the metal sleeve is sufficiently expanded, the elastic sleeve 3 can be pressed against the inner peripheral surface of the pipe B.

After the secondary diameter expansion of the metal sleeve 5 is completed, the reciprocating drive member 62 is operated to separate the pair of contact pieces 61 from the wedge 6, and the elevating member 26 is further operated to move the contact piece 61 to the metal sleeve. After making it lower than the inner diameter of 5, the carriage H is pulled out from the pipe B to the manhole C.

By going through the series of steps described above, it is possible to configure the fracture guiding portion A at the preset position 1a of the pipe B.

The method of constructing a rupture inducing portion in a pipeline according to the present invention is particularly advantageous when used in constructing a rupture inducing portion in a pipe B having a small diameter.

A Breaking guide B Pipe C Manhole D Frontage E Concrete H trolley 1 Groove 1a to 1c Position 2 Sealing material 3 Elastic sleeve 5 Metal sleeve 5a End 5b Inclined 6 Wedge 6a Groove 6b Bottom 7 Shear pin 10 Measuring device 11 Frame 12 , 23 Support frame 13 Diameter measuring member 13a Cylinder 13b Contact 13c Scale 14, 23a Case, Camera 16 Connecting member 16a Coupling member 17 Pushing rod 20, 21 Traveling member 22 Bow-shaped frame 22a Drive motor 24 Out trigger 26 Elevating member 27a Mounting seat 27b Sliding piece 28 Elevating motor 28a Elevating screw 29, 38, 44 Camera 30 Grooving device 31 Cutting tool 32 Drive motor 33, 36, 42, 64 Base plate 35 Depth measuring device 37 Scale 40 Sealing material filling device 41 Seal Material Filling nozzle 43 Filling gun 50 Primary diameter expansion device 51 Diameter expansion member 51a Diameter expansion member 52 Elevating member 52a Link piece 53a, 53b Moving member 54 Support frame 54a, 65 Camera 55 Elevating motor 55a Screw 60 Diameter expanding device 61 Contact piece 62 Reciprocating drive member 63 Guide member

Claims (9)

It is a construction method for constructing a rupture induction part at a preset position in a pipeline connected to a manhole.
A cutting tool is placed at a preset position in the pipeline, and the cutting tool moves the cutting portion along the inner peripheral surface of the pipeline and over the entire circumference while cutting the inner peripheral surface of the pipeline. In the groove forming step of forming a groove on the inner peripheral surface,
A measuring tool for measuring the depth of the groove is arranged so as to face the groove formed on the inner peripheral surface, the measuring tool is inserted into the groove to measure the depth, and the measuring tool is pulled out from the groove and in the circumferential direction. A groove depth measuring step of moving and measuring the depth of a plurality of positions of the groove,
The elastic sleeve and the metal plate having inclined portions formed at both ends in the width direction are wound around the inner diameter side of the elastic sleeve so as to face the groove whose depth has been measured, and both ends in the length direction are overlapped with each other. Metal sleeves with wedges temporarily fixed to each of the inclined portions formed at one end in the circumferential direction and at both ends in the width direction of the overlapping portion are arranged, and a plurality of metal sleeves are arranged in the radial direction from the inside of the metal sleeve. The primary diameter expansion step of engaging the inclined portion formed at the other end with each wedge temporarily fixed to one end in the circumferential direction by applying a force at the position of
The respective wedges temporarily fixed to the inclined portions formed at one end in the circumferential direction and at both ends in the width direction of the metal sleeve for which the primary diameter expansion has been completed are moved in the direction of approaching each other along the inclined portion. The secondary diameter expansion step of secondaryly expanding the diameter of the metal sleeve and pressing the elastic sleeve against the inner peripheral surface of the pipeline.
A method of constructing a rupture induction portion in a pipeline characterized by containing. Prior to the groove forming step, the diameter is measured at a plurality of locations in the laying direction of the pipeline and at a plurality of locations in the circumferential direction at each location centering on a preset position in the pipeline. The method of constructing a breakage guiding portion in a pipeline according to claim 1, further comprising a measurement step. Prior to the primary diameter expansion step, a sealing material filling device is placed facing the groove formed on the inner peripheral surface of the pipeline in the groove forming step, and the sealing material is filled in the groove by the sealing material filling device. A method of constructing a breakage guiding portion in a pipeline according to claim 1, wherein the sealing material filling step is included. The groove forming step includes a cutting tool that rotates to cut the inner peripheral surface of the pipeline, an elevating member that approaches or separates the cutting tool toward the inner peripheral surface of the pipeline, and the cutting tool and the elevating member. A groove forming device having a rotating member for moving the cutting tool along the inner peripheral surface of the pipeline is arranged at a position where a groove should be formed in the pipeline, and the cutting tool is rotated by the elevating member. A groove is formed by cutting the cutting tool close to the inner peripheral surface of the pipeline and moving the cutting tool along the inner peripheral surface of the pipeline by the rotating member, and after cutting a predetermined groove, the rotation The member stops the rotation of the cutting tool along the inner peripheral surface of the pipeline and stops the rotation of the cutting tool, and the elevating member separates the cutting tool from the inner peripheral surface of the pipeline. The method of constructing a breakage guiding portion in the pipeline according to claim 1, characterized in that it is present. The groove depth measuring step includes an elevating member that moves the measuring tool for measuring the depth of the groove into or out of the groove, and a rotating member that moves the measuring tool and the elevating member along the inner peripheral surface of the pipeline. A groove depth measuring device having a The elevating member separates the measuring tool from the groove, and the rotating member moves the measuring tool along the groove while measuring the depth of the groove at a plurality of positions. A method of constructing a breakage guiding portion in the pipeline according to claim 1. In the primary diameter expansion step, the primary diameter expansion device in which a plurality of diameter expansion members that expand and contract in the radial direction around the axis are arranged is arranged so as to face the groove formed on the inner peripheral surface of the pipeline. It was placed inside the sleeve and the metal sleeve arranged on the inner diameter side of the elastic sleeve, and the plurality of diameter-expanding members were extended at substantially the same time and temporarily fixed to the inclined portion of one end in the circumferential direction of the metal sleeve. The method of constructing a fracture guiding portion in a pipeline according to claim 1, wherein the metal sleeve is expanded in diameter until the inclined portion formed at the other end is engaged with each wedge. .. The secondary diameter expansion step includes a pair of contact members that abut on each wedge temporarily fixed to the inclined portions formed at one end in the circumferential direction and at both ends in the width direction of the metal sleeve. A secondary diameter expanding device having a driving member that brings the abutting members closer to each other or separated from each other, and an elevating member that brings the abutting member and the driving member closer to or separated from each other toward the inner peripheral surface of the metal sleeve. The pair of contact members are separated from the inner peripheral surface of the metal sleeve by the elevating member, and are arranged inside the metal sleeve whose primary diameter has been expanded. After facing each wedge, the driving member brings the contact member into contact with the respective wedges and brings the wedges closer to each other along an inclined portion formed at the end of the metal sleeve. The method of constructing a fracture guiding portion in a pipeline according to claim 1, wherein the metal sleeve is secondarily expanded in diameter and the elastic sleeve is pressed against the inner peripheral surface of the pipeline. In the diameter measuring step, a diameter measuring device having a telescopic member provided with a scale and a camera for photographing the scale of the telescopic member is arranged at a position where the diameter should be measured in the pipeline, and the telescopic member is extended. The breakage guiding portion is configured in the pipeline according to claim 2, wherein the diameter is measured by photographing the scale when abutting on the inner peripheral surface of the pipeline with the camera. Construction method. The sealing material filling step includes an elevating member that moves a filling nozzle that fills the groove with the sealing material into or out of the groove, and a rotating member that moves the filling nozzle and the elevating member along the inner peripheral surface of the pipeline. The sealing material filling device having the above is arranged at a position corresponding to the groove formed on the inner peripheral surface of the pipeline, and the filling nozzle is made to enter the groove by the elevating member to fill the sealing material, and then the rotation The method of constructing a breakage guiding portion in a pipeline according to claim 3, wherein the filling nozzle is moved along the groove by a member to fill the groove with a sealing material.

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