JP2003056747A - Drain pipe repairing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve quicker work, to reduce cost, and to accomplish highly reliable repair. SOLUTION: This drain pipe repairing method comprises using an auxiliary pipe 6 formed of a material capable of deforming an external shape to be smaller by granting outer force thereto and restoring it to an original shape by granting pressure to an internal. The external shape is deformed smaller by granting outer force to the auxiliary pipe 6 delivered by rotating a rotor on which the auxiliary pipe 6 is wound in a deliverable manner and the auxiliary pipe 6 being held in the deformed condition is inserted almost all over an area in a pipe body 1 to be repaired. Then, the auxiliary pipe 6 is restored to the original shape by granting pressure to the internal of the auxiliary pipe 6 and fixed to the pipe body 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is for embedding a plurality of pipes for guiding sewage, rainwater, etc. in the ground along the installation route and connecting the pipes to each other along the installation route. Relates to a drainage pipe repair method for repairing the pipe body in a drainage pipe structure having a connection portion such as a manhole.

[0002]

2. Description of the Related Art Since the above-mentioned pipe body is buried in the soil and used for drainage, it requires a certain level of strength and is constructed to guide water.
Conventionally, a concrete-made pipe has been used as a drainage pipe without causing problems such as rust and is relatively inexpensive, and therefore the following inconvenience has occurred.

[0003]

That is, when the pipe body is made of concrete as described above, the inner surface is scraped by contact with water flowing in the pipe body, and the outer surface is contacted with water existing in the soil. By doing so, due to the aging phenomenon or the vibration generated by an earthquake or the like, a part of the pipe body is cracked or cracked, and as a result, the water tightness of the pipe body is lowered,
There was a problem that the drainage guide function of the pipe body deteriorated or disappeared altogether. Therefore, in order to repair the tubular body,
For example, while the strip-shaped members are being sent out in a spiral shape, the widthwise ends of adjacent strip-shaped members are fitted to each other by a self-propelled pipe manufacturing machine to form a straightening pipe in the tubular body. After the calibration tube is formed in the tubular body, the clearance between the inner surface of the tubular body and the outer surface of the calibration tube is filled with mortar or the like to fix the calibration tube. Further, instead of the strip-shaped member, a straight pipe is formed by sequentially connecting short pipes that can be inserted from the opening at the upper end of the connecting portion, and the straight pipe is formed between the inner surface of the tubular body and the outer surface of the straight pipe as described above. It is also practiced to fill the gap with mortar or the like and fix the correction pipe. According to the above-mentioned two repair methods, both require fitting work or connecting work for forming the straightening pipe, and these works are not only time-consuming and troublesome, but also have a fitting part or a connecting part. Therefore, there is a possibility that a defective seal may occur at that portion, and the reliability cannot be improved. Further, in the former case, a self-propelled pipe manufacturing machine and a hydraulic unit for driving the same are required, which causes a problem of high cost. By the way, it is possible to apply mortar etc. directly to the inner surface of the pipe body to repair it, but even if mortar is applied, it is a temporary solution and it is not a fundamental solution, so improvement measures Is desired.

In view of the above situation, the present invention is to solve the problems in that the work can be speeded up and the cost can be reduced, and the repair can be performed with high reliability. is there.

[0005]

In order to solve the above-mentioned problems, the present invention embeds a plurality of pipes for guiding sewage, rainwater, etc. in the ground along the installation route, and in the middle of the installation route. In a drainage pipe structure provided with a connecting portion such as a manhole for connecting the pipes to each other, the outer shape can be deformed small by applying an external force, and the original shape can be obtained by applying pressure to the inside. The auxiliary pipe is made of a reversible material, and the auxiliary pipe is drawn out by rotating the rotating body on which the auxiliary pipe is wound so that the external shape is deformed small by applying an external force to the drawn auxiliary pipe. Then, the auxiliary pipe in a state where the deformed state is maintained is inserted over almost the entire inside of the tubular body, and then the auxiliary pipe is returned to its original shape by applying pressure to the inside of the auxiliary pipe. Restore By performing the repair of tube together to secure the secondary pipe of the restored state to the tube body, it is possible to solve the conventional problems. In other words, by inserting the auxiliary pipe for drainage guide inside the pipe body with its outer shape slightly deformed, not only the conventional fitting and connection become unnecessary, but also when inserting the auxiliary pipe. The area in which the outer surface of the auxiliary tube contacts the inner surface of the tubular body can be reduced, and the auxiliary tube can be inserted while suppressing the contact resistance. Then, pressure is applied to the inside of the auxiliary pipe inserted almost all over the inside of the pipe body to restore the auxiliary pipe to its original shape, and then the auxiliary pipe is fixed to the pipe body to complete the repair work. To do.

On the outer surface of the auxiliary pipe, there is provided a reinforcing portion which is spirally wound and fixed, and the reinforcing portion has a predetermined interval in the axial direction of the pipe in a posture in which the auxiliary portion extends upward from the outer surface of the auxiliary pipe. Consists of a pair of vertical portions that are erected substantially parallel to each other, and a strip plate portion that is fixed while being mounted on the upper ends of these vertical portions,
Both ends of the strip plate portion in the pipe axis direction are provided with extension plate portions extending from the vertical portion to the front and rear in the pipe axis direction, and each of the extension plate portions is located closer to the outer surface of the auxiliary pipe toward the tip end side. The inclined plate portion is formed. By providing the outer surface of the auxiliary pipe with the spiral reinforcing portion as described above, not only the shape-retaining strength of the auxiliary pipe itself can be increased, but also, for example, mortar is provided between the inner surface of the pipe body and the outer surface of the auxiliary pipe. (When mortar is advantageous for small gaps, concrete may be used depending on the size of the gap.) When fixing the auxiliary pipe to the pipe body, the auxiliary pipe moves in the longitudinal direction with respect to the pipe body. The anchor effect for preventing this can be exhibited in the reinforcing portion. Moreover, by constructing each of the extension plate portions of the reinforcing portion as inclined plate portions that are located closer to the outer surface of the auxiliary pipe toward the tip end side, the reinforcing portion can be The auxiliary tube can be smoothly inserted by the guiding action of the inclined plate portion without being caught by the inner surface of the body and becoming an insertion resistance.

By constructing the auxiliary pipe from low-density polyethylene, ultra-low-density polyethylene or high-density polyethylene, the auxiliary pipe can be easily deformed but can be reliably restored to its original shape after insertion. it can.

The reinforcing portion is made of the same material as the auxiliary pipe, and is made of low density polyethylene, extremely low density polyethylene or high density polyethylene. With the above configuration, the bonding (adhesion) force between the auxiliary pipe and the reinforcing portion can be increased. The reinforcing portion is heat-welded to the auxiliary pipe or is bonded with an adhesive.

With the insertion of the auxiliary pipe into the pipe body,
The mortar or the concrete is supplied into the space between the outer surface of the auxiliary pipe and the inner surface of the pipe body from the supply part provided at the tip of the auxiliary pipe toward the lower side in the insertion direction, and the mortar is supplied in the space. Alternatively, by filling with concrete, after the insertion of the auxiliary pipe, the filling work of restoring the auxiliary pipe to the original shape and then filling with mortar or concrete can be unnecessary. By restoring the auxiliary pipe, excess mortar or concrete of the mortar or concrete filled in the space is discharged from both ends of the pipe body. Then, over time, the mortar or concrete solidifies and the auxiliary pipe can be fixed to the pipe body. When the space is small, it is advantageous to supply mortar.

[0010]

FIG. 1 shows a drainage pipe structure for guiding sewage, rainwater, and the like. This drainage pipe structure is a concrete pipe body 1 buried along an installation route and these. It is composed of a plurality of connecting portions 2 such as concrete manholes for connecting the tubular bodies 1 and 1. In the figure, the tubular body 1 is composed of one tube having a length of about 30 m, but it may be composed of a plurality of short tubes connected to each other. The connecting portion 2 is preferably made of concrete in terms of strength and cost, but may be made of other materials. The figure shows a state in which a lid (not shown) for closing the opening above the connecting portion 2 is removed.

Explaining a repairing method for repairing the tubular body 1 constructed as described above, first, the inside of the tubular body 1 is inspected by a camera or the like, and a tubular body requiring repair such as a crack is generated. Find 1 Next, the inside of the pipe body 1 thus found is cleaned by the high-pressure jet 4 of the cleaning vehicle 3 as shown in FIG. Reference numeral 5 shown in FIG. 2 is a water stopcock for stopping the washing water from the high-pressure jet 4 so as not to enter the other pipe body 1. After that, as shown in FIG. 3, about 30 m having flexibility for drainage guide near the upper end opening 2K of one of the two connecting portions 2 and 2 adjacent in the arrangement route. The rotating body (drum) 7 around which the auxiliary pipe 6 having the length of 3 is wound is arranged, and the end of the cap 8 attached to the end of the auxiliary pipe 6 is pulled by the winch 9 arranged near the other connecting portion 2. After fixing the tip of the wire 10, the winch 9 as an insertion means
The auxiliary pipe 6 is connected to the connecting portion 2 by winding
It can be inserted into the tube body 1 through the opening 2K above.

As shown in FIGS. 9 and 10, the auxiliary pipe 6 is provided with a reinforcing portion 11 which is spirally wound and fixed on the outer surface of the auxiliary pipe 6, and the reinforcing portion 11 is provided on the outer surface of the auxiliary pipe 6. And a pair of vertical portions 11A and 11A which are erected substantially parallel to each other in the tube axis direction at a predetermined interval in a posture of being directed upward from the above, and fixed in a state of being placed on the upper ends of these vertical portions 11A and 11A. A strip plate portion 11B, and both ends of the strip plate portion 11B in the tube axis direction are provided with extension plate portions 11C and 11C extending from the vertical portions 11A and 11A in the tube axis direction front and back, respectively.
Each of the extending plate portions 11C and 11C is formed as an inclined plate portion that is located closer to the outer surface of the auxiliary pipe toward the tip end side. The auxiliary pipe 6 is formed of a synthetic resin such as low density polyethylene, extremely low density polyethylene, or high density polyethylene so that it can be deformed when an external force is applied. By using the high density polyethylene auxiliary pipe 6 as described above, the chemical resistance is superior to that of the concrete pipe body 1, and the roughness coefficient n is 0.013 in the case of the pipe body 1. On the other hand, the auxiliary pipe 6 made of high-density polyethylene has a low value of 0.010. Therefore, even if the drainage diameter is reduced by providing the auxiliary pipe 6 in the pipe body 1, there is an advantage that the drainage capacity is almost the same as that in the case of flowing through the pipe body 1, but other synthetic resin, synthetic rubber, etc. Any material can be used as long as it has flexibility.

By using the flexible auxiliary tube 6 as described above, the auxiliary tube 6 can be deformed and inserted into the tubular body 1 in a state where the outer shape of the auxiliary tube 6 is reduced. That is, as shown in FIG. 3 and FIGS.
A guide portion 8A that is tapered toward the tip and a base end portion 8B that can be inserted into the tip of the auxiliary tube 6 and is formed in an inverted Y shape.
After inserting the cap 8 consisting of and into the tip of the auxiliary pipe 6, a holding member 12 for holding and fixing the auxiliary pipe 6 in the inverted Y shape is attached to the cap 8 and the bolt 13 Is used to fix the auxiliary pipe 6 so as not to come off the holding member 12. Then, the auxiliary pipe 6 fed out by a roller 14 (see FIG. 3) rotatably provided on each of three brackets 14A fixed to the auxiliary pipe 6 insertion side end portion of the pipe body 1 in an inverted Y shape. It is configured such that it can be inserted into the tube body 1 while being deformed into a shape. By inserting the auxiliary pipe 6 into the inside of the pipe body 1 in a state in which the auxiliary pipe 6 is deformed in the inverted Y shape, the contact resistance of the auxiliary pipe 6 in contact with the inner surface of the pipe body 1 can be reduced, and the auxiliary pipe 6 The insertion work is easy and quick. The auxiliary pipe 6
In addition to deforming the shape into an inverted Y-shape, any shape such as a triangle, an ellipse, or a U-shape can be used as long as the outer shape of the auxiliary tube 6 can be reduced. 15, 1 shown in FIG.
Reference numerals 6 and 17 denote guide rollers as guide means provided on the inlet (insertion) side of the tube body 1 for moving and guiding the auxiliary tube 6 fed from the rotating body 7, and the guide roller 15 arranged on the ground. , 16 are provided with arch-shaped guide portions 18 and 19 so as to regulate the movement of the auxiliary pipe 6 fed out in the left-right direction and the upward direction.
Further, reference numerals 21 and 22 shown in FIG. 3 are guide rollers as guide means provided on the outlet side of the tube body 1 for guiding the movement of the wire 10, and above the guide rollers 22 arranged on the ground similarly. The arch-shaped guide portion 20 is extended to restrict the movement of the wire 10 wound by the winch 9 in the lateral direction and the upward direction. Here, the auxiliary pipe 6 is inserted into the pipe body 1 that needs repair to make repairs. However, the auxiliary pipe 6 is appropriately inserted into the pipe body 1 that does not need repair to increase the strength of the pipe body 1, etc. The purpose of may be achieved.

The auxiliary pipe 6 is formed by molding a synthetic resin such as the high-density polyethylene into a strip plate shape, and extruding the strip plate synthetic resin into a spiral shape. The tube body 6A is formed by overlapping and melting and adhering. Forming the overlapping thick-walled portions 6B has an advantage that the shape retention strength of the auxiliary tube 6 itself can be increased. In addition, the reinforcing portion 11 is connected to the portion 6B.
Although it is possible to increase the shape-retaining strength of the auxiliary pipe 6 as a whole by providing the reinforcing portion 11 at a portion separated from the
It can also be implemented by being provided on B.

After the auxiliary pipe 6 is set in the pipe body 1 as described above, both ends of the auxiliary pipe 6 are closed, and then water is filled from one end or both ends of the auxiliary pipe 6 so that the water pressure in the auxiliary pipe 6 is increased. After the auxiliary pipe 6 is returned to the original circular shape by the application, the filling material 24 is filled in the entire region of the gap between the outer surface of the auxiliary pipe 6 and the inner surface of the pipe body 1 to form the pipe body 1. The auxiliary pipe 6 can be fixed with respect to (see FIG. 4). In addition, in FIG.
It shows a state in which the auxiliary pipes 6 are installed for three pipes including the pipes 1, 1. When the auxiliary pipe 6 is restored by applying the fluid pressure such as the water pressure to the inside of the auxiliary pipe 6, a larger pressure is applied to the auxiliary pipe 6 than the case where the auxiliary pipe 6 is restored by a gas such as air, and the auxiliary pipe 6 is damaged. It is possible to avoid troubles such as causing it.

The timing of filling the filling material 24, here, the optimum mortar (concrete may be used depending on the size of the gap) for fixing the auxiliary pipe 6 to the pipe 1, is determined by the pipe of the auxiliary pipe 6. 1, the mortar 24 is inserted between the inner surface of the pipe body 1 and the outer surface of the auxiliary pipe 6 when the auxiliary pipe 6 is inserted into the pipe body 1 as shown in FIG. ) 25, a plurality of pipes 23 as a supply unit for supplying the inside of the cap 8 may be provided in the cap 8. Thus, the work of inserting the auxiliary pipe 6 into the pipe body 1 and the work of filling the filling material 24 can be completed at the same time, and the work can be speeded up. After the insertion of the auxiliary pipe 6, the auxiliary pipe 6 is returned to its original shape, so that the extra filler 24 in the gap can be pushed out from both ends of the pipe body 1. After that, the auxiliary tube 6 can be fixed to the tube body 1 by solidifying the mortar with the passage of time.

As the filler 24, in addition to cement material such as mortar, a base containing isocyanate as a main component,
It may be composed of a mixture of a curing agent having a polyol as a main component, or may be a plastic foam (foam) such as expanded polystyrene or polyurethane foam, a synthetic resin, etc. Any material may be used as long as it is hardened together. Further, any material may be used as long as the auxiliary tube 6 can be fixed to the tube body 1 by inserting a synthetic resin material, a rubber material or the like into the gap.
In addition, when the plastic foam (foam) or the like is used, it absorbs particularly the vibration generated by an earthquake,
It is possible to favorably avoid cracks or cracks in the tubular body 1 or the auxiliary pipe 6.

By providing the auxiliary pipe 6 as described above, a step is formed between the invert 2A of the connecting portion 2 and the drainage guide surface 2a, and the drainage cannot be performed well. As shown, the drainage guide surface 2 of the invert 2A
The height of the auxiliary pipe 6 may be made the same by placing a mortar (may be a molten resin or the like) 26 on a. Instead of the mortar, a dedicated drainage guide member (not shown) may be manufactured, and the drainage guide member may be fixed on the drainage guide surface 2a of the invert 2A.

[0019]

According to the first aspect of the invention, the flexible auxiliary pipe for guiding the drainage can be fed out by the rotating body and continuously inserted over the entire inside of the pipe body. This eliminates the need for such fitting and connection, and not only speeds up work, but also eliminates the need for conventional machines for forming pipes, reducing costs. it can. Moreover, since the auxiliary pipe is seamless, reliable repair without water leakage can be performed.
Also, by inserting the auxiliary pipe into the pipe body with its outer shape reduced, the insertion work can be performed smoothly and quickly, and the repair work can be speeded up.

According to the second aspect of the present invention, by providing the auxiliary pipe with the spiral reinforcing portion on the outer surface, not only the shape-retaining strength of the auxiliary pipe itself can be increased, but also the inner surface of the pipe body and the auxiliary pipe. When the auxiliary pipe is fixed to the pipe body by filling mortar or concrete between it and the outer surface of the pipe, the reinforcement part has an anchor effect to prevent the auxiliary pipe from moving in the longitudinal direction with respect to the pipe body. It can be exhibited, and it can be made advantageous without deformation or peeling in long-term use. Moreover, by constructing each of the extension plate portions of the reinforcing portion as inclined plate portions that are located closer to the outer surface of the auxiliary pipe toward the tip end side, the reinforcing portion can be The auxiliary pipe can be smoothly inserted by the guiding action of the inclined plate portion without being caught by the inner surface of the body to cause insertion resistance, which is advantageous in repair work.

According to the third aspect of the present invention, the auxiliary pipe is made of low-density polyethylene, extremely low-density polyethylene or high-density polyethylene so that the auxiliary pipe can be easily deformed, but the original shape after insertion is maintained. The shape can be reliably restored, which is advantageous in terms of handling. Further, by providing the high-density polyethylene auxiliary pipe 6 in the pipe body 1, even if the drainage diameter becomes small,
It has the advantage that the drainage capacity is almost the same as when it is drained by a pipe.

According to the fourth aspect of the present invention, the auxiliary pipe and the reinforcing portion are made of the same material, so that the bonding (adhesion) force between the auxiliary pipe and the reinforcing portion can be increased, and the peeling of the both can be prolonged. Can be avoided over a period of time.

According to the invention of claim 5, with the insertion of the auxiliary pipe into the pipe, the tip of the auxiliary pipe is provided in the space between the outer surface of the auxiliary pipe and the inner surface of the pipe. By supplying the mortar or concrete from the supply portion to the lower side in the insertion direction and filling the space with mortar or concrete, after the auxiliary pipe is inserted, the auxiliary pipe is restored to its original shape. Therefore, the filling work for filling the mortar or concrete can be eliminated, and the work efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing a drainage pipe structure.

FIG. 2 is a vertical cross-sectional side view showing a state in which the inside of the tube is being washed.

FIG. 3 is a vertical cross-sectional side view showing a state in which an auxiliary pipe is being inserted into the tubular body.

FIG. 4 is a vertical cross-sectional side view showing the drainage pipe structure in a repair completed state.

FIG. 5 is an exploded perspective view showing a state immediately before the cap is attached to the starting end portion of the auxiliary pipe.

FIG. 6 is a perspective view showing a state in which a cap is attached to the auxiliary pipe and the auxiliary pipe is deformed.

FIG. 7 is a vertical cross-sectional view showing a state in which the auxiliary pipe is being deformed by rollers and is being drawn into the pipe body.

FIG. 8 is a vertical cross-sectional view of a state in which a cap is fixed to an auxiliary pipe via a holding member.

FIG. 9 is a vertical sectional view of an auxiliary pipe.

FIG. 10 is a side view of an auxiliary pipe.

FIG. 11 is an explanatory view showing a state where concrete is filled between the inner surface of the tubular body and the outer surface of the auxiliary pipe as the auxiliary pipe is inserted.

[Explanation of symbols]

1 tube 2 connection 2A Invert 2a Drainage guide surface 2K Top opening 3 Washing car 4 High-pressure jet 5 Water stopcock 6 Auxiliary tube 6A Tube body 6B Thick part 7 Rotating body (drum) 8 Cap 8A Guide 8B base end 9 winch (insertion means) 10 wire 11 reinforcement part 11A vertical part 11B strip part 11C extension plate part (slope plate part) 12 Clamping member 13 Bolt 14 rollers 15-17 guide rollers 18, 19, 20 Guide part 21,22 Guide roller 23 Pipe (Supply Section) 24 Mortar 25 space 26 mortar

Claims (5)

[Claims] 1. A plurality of pipes for guiding sewage, rainwater, etc. are buried in the ground along an arrangement route, and a connecting portion such as a manhole for connecting the pipes is provided in the middle of the arrangement route. In the provided drain pipe structure, an external pipe can be deformed to a small size by applying an external force, and an auxiliary pipe made of a material that can be restored to its original shape by applying pressure to the inside is used. The auxiliary tube is drawn out by rotating a rotatable body that is freely drawn, and the external shape is deformed to a small extent by applying an external force to the drawn auxiliary tube. It is inserted into almost the entire inside of the body, and then pressure is applied to the inside of the auxiliary pipe to restore the auxiliary pipe to its original shape and fix the restored auxiliary pipe to the pipe body. Complementary tube A drainage pipe repair method characterized by performing repairs. 2. The outer surface of the auxiliary pipe is provided with a reinforcing portion which is wound and fixed in a spiral shape, and the reinforcing portion has a predetermined interval in the axial direction of the pipe in a posture of going upward from the outer surface of the auxiliary pipe. And a strip plate portion fixedly attached to the upper ends of the vertical portions, the strip plate portion having both ends in the tube axis direction in the axial direction. 2. An extension plate part extending from the vertical part to the front and rear in the tube axis direction, the extension plate parts being configured as inclined plate parts positioned closer to the outer surface of the auxiliary pipe toward the tip end side. Drain pipe repair method described. 3. The drainage pipe repairing method according to claim 1, wherein the auxiliary pipe is made of low density polyethylene, extremely low density polyethylene or high density polyethylene. 4. The reinforcing portion is made of the same material as the auxiliary pipe and is made of low density polyethylene, extremely low density polyethylene or high density polyethylene.
Drain pipe repair method described. 5. Along with the insertion of the auxiliary pipe into the pipe body, the auxiliary pipe is inserted into the space between the outer surface of the auxiliary pipe and the inner surface of the pipe body from a supply portion provided at the tip of the auxiliary pipe. The mortar or concrete is supplied toward the lower side in the direction, and the space is filled with mortar or concrete.
Drain pipe repair method described.