JP2019014216A - Repairing method of existing pipe, and truck - Google Patents

Abstract

To provide a construction method capable of partial repairing an intermediate portion of an existing pipe by use of a rehabilitation pipe formed by spirally winding a belt-like member even when the diameter difference between the existing pipe and the rehabilitation pipe is small.SOLUTION: A spiral ring 20 composed of at least a part of a rehabilitation pipe 2 is fabricated by spirally winding a belt-like member 2a one round or more outside an existing pipe 1. A wheel 13 is installed to each outside of both end portions of the spiral ring 20 in the axial direction, and the spiral ring 20 is carried to the intermediate portion of the existing pipe 1. After arrival, the wheel 13 is removed and the remainder of the rehabilitation pipe 2 is manufactured by a pipe manufacturing machine 3.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a method and a carriage for repairing an existing pipe in the ground by a rehabilitation pipe formed by spirally winding a belt-like member, and in particular, when the difference between the diameters of the existing pipe and the rehabilitation pipe is small, an intermediate portion of the existing pipe is provided. The present invention relates to a repair method and a carriage suitable for partial repair.

  It is known to repair the existing pipe by lining the rehabilitated pipe on the inner peripheral surface of an existing pipe such as an aged sewer pipe. For example, Patent Documents 1 and 2 disclose a pipe manufacturing method as an example of a repair method. In the pipe-making method, a pipe-making machine is used to join the edges adjacent to each other around the belt-like member while spirally winding the synthetic resin-like belt-like member along the inner wall of the existing pipe. It forms a rehabilitation tube consisting of tubes. After the pipe making, between the inner periphery of the existing pipe and the renovated pipe, a backfilling material such as mortar is filled and sealed.

Japanese Patent No. 4866428 International Publication Number WO2012 / 108434

  Aging may progress only in certain parts of existing pipes. For example, when an existing pipe crosses a road under which a large vehicle frequently passes or a railroad track, a crack may occur in the axial direction of the existing pipe at the crossing point. Even when a ground structure is created after the existing pipes are constructed, cracks may occur in the pipe part immediately below.

When existing pipes are partially aged, there is also a demand to repair only the aged part, rather than repairing the entire existing pipe, from the viewpoint of cost reduction.
As a partial repair method, a method of installing an FRP pipe in a repair target part of an existing pipe is known. However, FRP pipes have poor adhesion to the inner circumference concrete of existing pipes, and there is a concern that they may come off or come off after construction, and are not recognized as permanent countermeasures, and there are few examples of adoption.

On the other hand, according to the pipe making method described above, the existing pipe and the rehabilitated pipe can be firmly joined by the backfill material, which is effective as a permanent repair method. When partially repairing an intermediate part of an existing pipe by the pipe making method, a pipe making machine is inserted and installed to the intermediate part to perform pipe making.
In the initial stage of the pipe making method, a belt-like member is wound about several times around an annular inner circumference regulating frame called a link roller of a pipe making machine to produce an unwinding ring. The unwinding ring of at least the first round needs to be wound manually. Usually, the diameter of the unwinding ring is larger than the diameter of the inner circumference regulating frame and the desired diameter of the rehabilitation pipe. In particular, when the belt-shaped member includes a reinforcing steel material that can bear the strength, it is not easy to bend it manually, and the unwinding ring has a large diameter. For this reason, in order to produce the unwinding ring, a working space having a desired diameter of the rehabilitation pipe plus a diameter of, for example, about 500 mm is required at a minimum.

However, when the difference between the diameters of the existing pipe and the renovated pipe is small, the unwinding ring cannot be produced because the working space is insufficient inside the existing pipe, and the pipe making cannot be started.
In view of such circumstances, the present invention provides a method of repairing an intermediate portion of an existing pipe by a rehabilitation pipe in which a strip-like member is spirally wound even if the difference between the diameters of the existing pipe and the rehabilitation pipe is small. is there.

In order to solve the above problems, the method of the present invention is a method of repairing an existing pipe by installing a rehabilitation pipe formed by spirally winding a belt-shaped member along the inner periphery of the existing pipe in the ground. And
Producing a spiral ring comprising at least a part of the rehabilitation pipe outside the existing pipe;
Attaching each wheel to the outside of both axial ends of the spiral ring;
Transporting the spiral ring to an intermediate portion of the existing pipe by rolling the wheel to the bottom of the existing pipe and rolling the wheel;
Removing the wheel after the transportation;
It is provided with.

By making the spiral ring outside the existing pipe, the working space limitation is eliminated or alleviated. The difference in diameter between the existing pipe and rehabilitation pipe is not a problem.
By attaching and rolling wheels on both ends of the produced spiral ring in the axial direction, the spiral ring can be transported to a deteriorated or deteriorated repair target portion of the intermediate portion of the existing pipe with a small force. Moreover, it is not necessary to secure the space for arranging the wheel between the bottom of the outer periphery of the spiral ring and the bottom of the inner periphery of the existing pipe by attaching the wheel to the outside in the axial direction of the spiral ring. Lifting amount is small. Therefore, even if the difference between the inner diameter of the existing pipe and the outer diameter of the spiral ring is small, the spiral ring can be reliably inserted into the existing pipe.
By removing the wheel after transportation, the spiral ring is installed in the repair target part of the existing pipe. When the spiral ring is a part of the rehabilitation pipe, the rehabilitation pipe is completed by further producing the pipe following the spiral ring. Thereafter, a back-filling material such as mortar is filled between the inner periphery of the repair target portion of the existing pipe and the outer periphery of the renovated pipe. When the spiral ring is the entire rehabilitation pipe, after the removal of the wheel, further pipe making is omitted and the backfill material is filled. The backfill material can seal between the existing pipe and the rehabilitated pipe, and can firmly join the existing pipe and the rehabilitated pipe.

In the production step, as the spiral ring, an unwinding ring formed by spirally winding the belt-shaped member around the pipe making machine is produced,
In the carrying step, the pipe making machine is carried to the intermediate portion together with the unwinding ring,
After the transportation, it is preferable that the remaining part of the rehabilitated pipe is produced by the pipe making machine.
By unwinding outside the existing pipe, a wide working space can be secured and the unwinding ring can be produced reliably.
The unwinding ring is preferably produced in the human hole at the end of the existing pipe. After producing the unwinding ring on the ground, it may be lowered into the human hole.
Since the pipe making machine is assembled to the unwinding ring, if the wheels are attached to both ends of the unwinding ring and transported to the repair target part of the middle part of the existing pipe, the pipe making machine will be repaired together with the existing pipe. Carried to part. Even if the pipe making machine is the same, it can be transported by rolling the wheels, so it can be transported sufficiently by human power. Moreover, after transportation, the pipe making can be started in a short time by driving the pipe making machine assembled to the unwinding ring.

The device of the present invention is a carriage used in the repair method,
A fixing jig separably fixed to the spiral ring;
A wheel support provided so as to protrude outward in the axial direction from the fixing jig;
And the wheel is rotatably supported by the wheel support portion.
The unwinding ring can be lifted from the ground contact surface and supported by attaching the carts to both ends of the spiral ring in the axial direction. And it can be transported with a small force by rolling the wheel.
According to the cart, the fixing jig is cantilevered with respect to the wheel, and the wheel can be disposed outside the axial end of the spiral ring. Therefore, even if the difference between the inner diameter of the existing pipe and the outer diameter of the spiral ring is small, the spiral ring can be reliably inserted into the existing pipe.
The cart has a simple structure and can be reduced in size and weight.

  According to the present invention, even if the difference between the diameters of the existing pipe and the rehabilitated pipe is small, the intermediate part of the existing pipe can be partially repaired by the rehabilitated pipe in which the belt-like member is spirally wound.

FIG. 1 is a side view showing a manufacturing process of the first round of the unwinding ring in the method for repairing an existing pipe according to an embodiment of the present invention. FIG. 2 is a front view of the unwinding ring along the line II-II in FIG. FIG. 3 is a side view showing a manufacturing process of the unwinding ring after the first round. FIG. 4 is a side view showing a cutting process of a portion having a diameter larger than the desired diameter of the unwinding ring. FIG. 5 is a side view showing a state in which a carriage is attached to both ends of the unwinding ring. FIG. 6 is a side view showing a process of transporting the unwinding traveling body to a repair target portion in the middle of the existing pipe. FIG. 7 is a side view showing the unwinding ring to be fixed to the carriage with phantom lines. FIG. 7 is a front view of the cart. FIG. 9 is a perspective view of the cart. FIG. 10 is a side view showing a state where the unwinding ring is installed at the pipe making start position of the repair target portion. FIG. 11 is a side view showing a pipe making process of the remaining part of the rehabilitated pipe. FIG. 12 is a side cross-sectional view of a repaired existing pipe.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 10 shows the existing pipe 1 buried in the ground. Examples of the existing pipe 1 include a sewer pipe, a water pipe, an agricultural water pipe, and a gas pipe.
It is assumed that a crack 1c (deteriorated part) is formed in the middle part of the existing pipe 1 in the pipe axis direction (left and right in FIG. 10) due to long-term service. On the other hand, it is assumed that both ends of the existing pipe 1 in the pipe axis direction are not deteriorated so much.
In addition, it is preferable that the diameter (inner diameter) of the existing pipe | tube 1 is a magnitude | size which a person can go in and out, and specifically, it is preferable that it is about 900 mm or more.

  As shown in FIG. 12, in the repair method according to the present embodiment, only the intermediate portion including the crack 1c of the existing pipe 1 is set as a repair target portion 1a. The existing pipe 1 is partially repaired by lining the rehabilitation pipe 2 (spiral pipe) along the inner periphery of the repair target portion 1a.

  As shown in FIG. 11, the rehabilitation pipe 2 is constituted by a long belt-like member 2a. As shown in FIG. 7, the band-shaped member 2a includes a band main body 2b made of synthetic resin such as polyvinyl chloride and a steel reinforcing band member 2c. The strip-shaped member 2a is spirally wound, and adjacent edges that are different by one turn are joined by concave-convex fitting, thereby forming a spiral tubular rehabilitation pipe 2. The difference in diameter between the existing pipe 1 and the renovated pipe is sufficiently small.

The rehabilitation pipe 2 is manufactured as follows, and the existing pipe 1 is partially repaired.
<Pipe making machine 3>
As shown in FIGS. 1 and 2, first, a pipe making machine 3 is prepared. As shown in FIG. 2, the pipe making machine 3 includes a pipe making machine main body 3a and an inner periphery regulating frame 3b. Although not shown in detail, the pipe making machine main body 3a is provided with a fitting roller, a drive motor, a gear block, and the like. The inner periphery regulating frame 3b is also called a link roller, and has an annular shape with a diameter that matches the desired diameter of the rehabilitation pipe 2. A pipe making machine main body 3a is provided at one place in the circumferential direction of the inner circumference regulating frame 3b.

<Unwinding ring production process>
A winding drum 5 is installed near the upper end opening of the human hole 4 connected to one end of the existing pipe 1 (FIG. 10). The belt-like member 2a is fed out from the winding drum 5. And as shown in FIG.1 and FIG.2, the unwinding ring 20 (spiral ring) of the rehabilitation pipe | tube 2 is produced. Specifically, one or more rounds from the end of the belt-like member 2 a are spirally wound around the inner circumference regulating frame 3 b of the pipe making machine 3.

  At least the first ring portion 21a of the unwinding ring 20 is manually wound. The diameter of the ring portion 21a on the first circumference is usually larger than the diameter of the inner circumference regulating frame 3b and the desired diameter of the rehabilitation pipe 2. In particular, when the band-shaped member 2a includes a hard steel reinforcing band 2c, the ring portion 21a in the first round tends to have a large diameter because it is difficult to bend. For this reason, if the aperture difference between the existing pipe 1 and the renovated pipe 2 is small, the outer diameter of the ring portion 21 a tends to be larger than the inner diameter of the existing pipe 1.

The manufacturing operation of the unwinding ring 20 is performed outside the existing pipe 1. Preferably, the unwinding ring 20 is manufactured in the human hole 4 connected to one end of the existing pipe 1.
As a result, the restriction on the work space can be eliminated or alleviated, and the difference in diameter between the existing pipe 1 and the renovated pipe 2 does not become a problem. Even if the ring portion 21a is larger than the desired diameter of the rehabilitation pipe 2, workability is not impaired. Further, even if the ring portion 21a is larger than the inner diameter of the existing pipe 1, the work is not disabled.

  As shown in FIG. 3, the number of turns of the unwinding ring 20 is increased by driving the pipe making machine 3 after producing the ring portion 21a for the first round. Along with this, the newly wound ring portion is gradually reduced in diameter, and eventually becomes a desired diameter by being tightly wound around the inner circumference regulating frame 3b.

  Next, as shown by a two-dot chain line in FIG. 4, the ring portions 21 for several turns including the first turn from the unwinding end to the desired diameter are cut and removed. As a result, as shown by a solid line in FIG. 4, the unwinding ring 20 having a desired diameter as a whole is formed.

<Carriage installation process>
As shown in FIG. 5, subsequently, the carts 10 are respectively attached to both ends of the unwinding ring 20 in the axial direction (left and right in FIG. 5). Thus, an unwinding traveling body 22 including the unwinding ring 20, the two carriages 10, 10 and the pipe making machine 3 is formed. The two carts 10 have the same structure.

<Dolly 10>
As shown in FIGS. 7 to 9, each cart 10 includes a fixing jig 11, a wheel support portion 12, and a wheel 13. The fixing jig 11 is detachably fixed to the unwinding ring 20.

  Specifically, the fixing jig 11 includes a bottom plate portion 11a, an end wall portion 11b, a beam 14, and a clamp portion 15. The bottom plate portion 11 a has a plate shape with a circular arc shape that is curved according to the curvature of the outer periphery of the unwinding ring 20. An end wall portion 11b is erected on one end portion in the longitudinal direction of the bottom plate portion 11a. The end wall portion 11b is formed, for example, in a fan shape in a front view. The lower end part of the end wall part 11b is joined to the bottom plate part 11a.

  A clamp portion 15 is provided on the end wall portion 11 b via a beam 14. The beam 14 is cantilevered from the upper side of the end wall portion 11b to the rear (rightward in FIG. 7). A clamp 15 is vertically attached to the tip of the beam 14. A pad 15a at the lower end of the clamp portion 15 faces the bottom plate portion 11a.

  A pair of wheel support portions 12 are provided on the left and right side portions of the end wall portion 11b. The wheel support portion 12 protrudes outward in the front-rear direction (the axial direction along the left-right direction in FIG. 7) from the fixed jig 11. The wheel support portion 12 is connected to the end wall portion 11 b via the height adjustment mechanism 16, so that the height of the wheel support portion 12 can be adjusted with respect to the fixed jig 11. The height adjusting mechanism 16 includes a longitudinal slit 16a formed in the wheel support portion 12, and a bolt 16b that stops the wheel support portion 12 and the end wall portion 11b through the longitudinal slit 16a.

A wheel 13 is rotatably supported by each wheel support portion 12. The lower end portion of the wheel 13 protrudes slightly below the bottom plate portion 11a. By adjusting the height of the wheel support portion 12, the protrusion amount of the wheel 13 can be adjusted.
The fixing jig 11 is cantilevered with respect to the wheel 13.

As shown in FIG. 5, the front end of the unwinding ring 20 is mounted on the bottom plate portion 11 a of the cart 10 on the front side (left side in FIG. 5) and the clamp portion 15 is tightened. The portion is sandwiched between the clamp portion 15 and the bottom plate portion 11a. Note that the pipe making machine 3 may also be sandwiched (FIG. 7).
Similarly, the rear end portion of the unwinding ring 20 is sandwiched between the bottom plate portion 11a and the clamp portion 15 of the carriage 10 on the rear side (right side in FIG. 5).
The unwinding ring 20 is lifted from the lower end of the wheel 13 and supported by the two front and rear carriages 10 and 10.

<Insertion process>
As shown in FIG. 6, the unwinding traveling body 22 including the unwinding ring 20 and the pipe making machine 3 is inserted into the existing pipe 1 through the human hole 4. By preparing the unwinding ring 20 in the manhole 4, the step of lowering the unwinding ring 20 from the ground into the manhole 4 can be omitted, and the insertion work into the existing pipe 1 can be performed immediately. .

<Transportation process>
Further, as shown in FIG. 6, the unwinding traveling body 22 is rolled to the end of the repair target portion 1 a by rolling the wheels 13, 13 of the front and rear carriages 10, 10 to the bottom of the inner periphery of the existing pipe 1. Is transported to the pipe making start position 1b (FIG. 10).
The unwinding traveling body 22 has a weight of, for example, about 200 kg including the pipe making machine 3. When the wheel 13 is attached and rolled, the friction coefficient becomes, for example, about 0.1, and is transported with a force of about 20 kg. be able to. Therefore, even if there is only one worker, it can be transported by human power. Of course, it may be transported using a power source such as a winch, in which case the required power of the power source can be reduced.
By disposing the wheel 13 of each carriage 10 on the front and rear outside of the unwinding ring 20, it is not necessary to secure a space for disposing the wheel 13 below the unwinding ring 20, and the lifting amount of the unwinding ring 20 is slightly increased. Just do it. As a result, even if the difference between the inner diameter of the existing pipe 1 and the outer diameter of the unwinding ring 20 is small, the unwinding ring 20 can be securely inserted into the existing pipe 1 and further transported to the pipe making start position 1b. can do.
When there is a step in the inner periphery of the existing pipe 1, the height of the unwinding ring 20 can be adjusted by adjusting the height of the wheel support portion 12 and thus the wheel 13 with respect to the fixing jig 11. Thereby, the unwinding traveling body 22 can get over the step.

<Dolly removal process>
As shown in FIG. 10, after arriving at the pipe making start position 1b, the carriage 10 is removed, and the unwinding ring 20 is installed at the pipe making start position 1b.
If the unwinding ring 20 is displaced in the circumferential direction during transportation, the unwinding ring 20 is rotated in the opposite direction to return to the original angle.

<Pipe making process>
Next, as shown in FIG. 11, the pipe making machine 3 is driven, and the remaining portion 23 of the renovated pipe 2 following the unwinding ring 20 is piped. Thereby, the rehabilitation pipe | tube 2 can be lined to the repair object part 1a of the middle of the existing pipe | tube 1. FIG.

<Backfill process>
As shown in FIG. 12, the gap between the existing pipe 1 and the renovated pipe 2 is filled with a backfilling material 6 such as mortar. Thereby, while being able to seal between the existing pipe 1 and the renovated pipe 2, the renovated pipe 2 can be firmly joined to the existing pipe 1, and a joining state can be maintained permanently.
In this way, the repair target portion 1a of the existing pipe 1 can be partially repaired. The construction cost can be reduced compared to repairing the entire existing pipe 1.

The present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, when the repair target portion 1a of the intermediate portion of the existing pipe 1 is short, the entire rehabilitation pipe 2 (helical ring) is produced outside the existing pipe 1, and the carriage 10 is attached to the rehabilitation pipe 2 and installed. You may decide to convey and install to the repair object part 1a of the middle of the pipe | tube 1. FIG. In this case, when inserting the rehabilitation pipe 2 into the existing pipe, it is not necessary to assemble the pipe making machine to the rehabilitation pipe 2. The pipe making process after installation is unnecessary.
The pipe making method of the rehabilitated pipe 2 is not limited to the self-propelled method in which the pipe making machine 3 is self-propelled (FIG. 11), and may be a main push type or a tow type.

  The present invention can be applied to a technique for rehabilitating existing pipes such as aging sewer pipes, water pipes, agricultural water pipes, gas pipes, etc. with a helical rehabilitation pipe.

1 Existing pipe 1a Repair target part (intermediate part)
1b Pipe making start position 1c Crack 2 Rehabilitated pipe 2a Strip member 20 Unwinding ring (spiral ring)
21 Ring part 22 of first round Unwinding traveling body 23 Remaining part of rehabilitation pipe 2 Pipe making machine 3a Pipe making machine main body 3b Inner circumference restriction frame 4 Manhole 10 Carriage 11 Fixing jig 12 Wheel support part 13 Wheel 15 Clamp part 16 Height adjustment mechanism

Claims (3)

A method of repairing the existing pipe by installing a rehabilitation pipe formed by spirally winding a belt-shaped member along the inner periphery of the existing pipe in the ground,
Producing a spiral ring comprising at least a part of the rehabilitation pipe outside the existing pipe;
Attaching each wheel to the outside of both axial ends of the spiral ring;
Transporting the spiral ring to an intermediate portion of the existing pipe by rolling the wheel to the bottom of the existing pipe and rolling the wheel;
Removing the wheel after the transportation;
A method for repairing an existing pipe, characterized by comprising: In the production step, as the spiral ring, an unwinding ring formed by spirally winding the belt-shaped member around the pipe making machine is produced,
In the carrying step, the pipe making machine is carried to the intermediate portion together with the unwinding ring,
The repair method according to claim 1, wherein after the transportation, the remaining portion of the renovated pipe is piped by the pipe making machine. A carriage used in the repair method according to claim 1 or 2,
A fixing jig separably fixed to the spiral ring;
A wheel support provided so as to protrude outward in the axial direction from the fixing jig;
And the wheel is rotatably supported by the wheel support portion.

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