JPH0469477A - Lining method for existing tube - Google Patents

Abstract

PURPOSE:To certainly enlarge the tip end portion of a helical tube without breaking the helical tube to thus come into close contact with a holding tube by engaging the tip end portion of the helical tube inserted into an existing tube with the holding tube, and applying a thrust force onto a band-like body in the above-mentioned engaged state. CONSTITUTION:In a tube manufacturing machine 20, a band-like wire rod 30 is provided so that adjacent side edge portions of a band-like body 10 are firmly locked, thus obtaining a helical tube 10'. The helical tube 10' is driven by the tube manufacturing machine 20 to advance. The tip end of the helical tube 10' extending into a manhole 83 proceeds in a holding tube 64, and abuts against an abutting plate 65, to be thus inhibited from proceeding. Upon applying a thrust force onto the band-like body 10, the band-like wire rod 30 is released from the side edge portions of the band-like body 10 at the tip end portion of the helical tube 10' so that the side edge portions are brought into a mutual slidable state. Consequently, the tip end of the helical tube 10' is enlarged, to come into close contact with the inner surface of the holding tube 64. With further application of the thrust force to the band-like body 10, the helical tube 10' is enlarged in sequence, to thereby come into close contact with the inner surface of a sewer 81.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a lining method for existing pipes that is carried out when rehabilitating aging existing pipes. In more detail,
The present invention relates to an existing pipe lining method in which a spiral pipe manufactured by spirally winding a synthetic resin band is directly inserted into an existing pipe and the existing pipe is lined with the inserted spiral pipe.

(Prior Art) Metal pipes and humid pipes have been used as buried pipes for water supply and sewerage systems for a long time.

Such buried pipes become obsolete after long-term use, and there is a risk that they may crack or corrode, leading to leakage or infiltration of groundwater. For this reason, recently, synthetic resin pipes are inserted into existing pipes such as aged buried pipes to line them.

One method for lining existing pipes is to line existing pipes with a spiral pipe that is manufactured by spirally winding a synthetic resin band. This method is disclosed, for example, in Japanese Patent Laid-Open No. 61-48690. The method disclosed in this publication is carried out by installing a pipe making machine capable of manufacturing a spiral pipe opposite the end opening of an existing pipe.

The pipe-making machine is sequentially supplied with synthetic resin strips whose side edges can engage with each other, and the pipe-making machine winds the strips in a helical manner, and by the winding. A helical tube is sequentially manufactured by engaging the side edges of adjacent strips. The helical tubes produced are sequentially led out of a rotary tube making machine. Then, the spiral pipe led out from the pipe making machine is directly introduced into the existing pipe and is propelled while rotating within the existing pipe. When the spiral tube is inserted over substantially the entire area of the existing pipe, a backfilling material such as cement mortar is filled between the spiral tube and the existing pipe, and the spiral tube is fixed within the existing pipe. As a result, the existing pipe is lined with the spiral pipe.

(Problem to be solved by the invention) In such a lining method, the inventors of the present application
When winding a strip around a spiral tube, by sandwiching a wire between the engaged side edges of the strip, the resistance between the engaged side edges of the strip is increased, and the side edges Developed a method to create a state of strong contempt between departments. If a helical tube is manufactured in this way, the wire increases the resistance between the side edges of the band-shaped body constituting the helical tube, so that a helical tube with a small diameter can be manufactured.

Then, after inserting such a small-diameter spiral tube into the existing pipe, a belt-like body is supplied in the same way as when manufacturing a spiral pipe, thereby imparting a propulsive force to the belt-like body that makes up the spiral pipe. , if the wire is separated from between the side edges of the strip,
Starting from the portion where the side edges are firmly locked together and the wire is released, the side edges of each band-shaped body sequentially slide against each other, and the spiral tube expands in diameter while rotating. Then, the diameter-expanded spiral tube comes into almost contact with the inner circumferential surface of the existing tube.

A small-diameter helical tube inserted into an existing pipe must be fixed to the existing pipe by expanding its diameter so that the tip of the pipe is in close contact with the inner circumferential surface of the existing pipe before the wire rods are sequentially removed from the helical pipe. be. Expanding the diameter of the tip of a helical tube has traditionally been done manually. First, the wire is removed from the tip of the helical tube that has been inserted through the existing tube, and a pair of small holes are drilled in the tip. Form. After that, each end of the operating rod is inserted into each small hole, so that the operating rod is installed between the small holes.

Then, by rotating the TifjJ operating rod, the diameter of the tip of the helical tube is expanded.

In this way, when the diameter of the distal end of a helical tube is expanded by the rotation operation of the operating shaft, since the helical tube is forcibly rotated, the band-shaped portion constituting the helical tube is expanded at the distal end of the helical tube. There is a risk that the engagement between the side edges of the body may be disengaged and the helical tube may be disassembled.

The present invention solves the above-mentioned conventional problems, and its purpose is to reliably make the tip of a relatively small-diameter helical tube inserted into an existing pipe approximately equal to the inner diameter of the existing pipe without damaging the helical tube. The object of the present invention is to provide a lining method for existing pipes that can be expanded to a similar outer diameter.

(Means for Solving the Problems) The existing pipe lining method of the present invention is a process of manufacturing a spiral pipe by winding a strip and locking the side edges of the mutually adjacent strips. a step of sequentially inserting the helical tubes into the existing pipe, pushing the inserted helical tubes into the existing pipe and rolling the tip from the existing tube; While releasing the strong locking state between the side edges of the band-shaped body, a holding tube having an inner diameter approximately the same as the inner diameter of the existing pipe is fitted into the tip of the spiral tube extending from the existing pipe. a step of attaching it concentrically to the end of the existing pipe; and a step of applying a propulsive force to the band-like body constituting the helical pipe and preventing forward movement of the tip of the helical pipe in the axial direction; and a step of expanding the diameter of the holding tube so as to be in contact with the inner circumferential surface of the holding tube, thereby achieving the above object.

(Function) A small-diameter spiral tube in which the side edges of the band-shaped body do not slide against each other is manufactured and inserted into the existing tube. The distal end of the helical tube is extended from the existing pipe, and the distal end is fitted into a holding tube having an inner diameter substantially the same as that of the existing pipe, with the side edges of the helical tube being able to slide against each other. Then, a propulsive force is applied to the band-shaped body constituting the helical tube while preventing the forward movement of the tip of the helical tube in the axial direction. As a result, the side edges of the strip at the tip of the helical tube slide against each other, and the diameter is expanded so that the tip comes into close contact with the inner circumferential surface of the holding tube.

(Example) The present invention will be described below with reference to Examples.

For example, as shown in FIG.
It is carried out when rehabilitating a person. In the method of the present invention, first, a band-shaped body 10 made of synthetic resin is made into a spiral tube 10' using a tube making machine 20 driven by a hydraulic motor 22. The pipe making machine 2
0 is a manhole 82 to which one end of the sewer pipe 81 is connected.
The spiral pipes 10' that have been installed and manufactured are sequentially introduced into the sewer pipe 81. At this time, the spiral pipe 10' has an outer diameter sufficiently smaller than the inner diameter of the drain pipe 81 so that at least the portion other than the bottom portion does not come into contact with the inner circumferential surface of the drain pipe 81.

The strip 10 used in the method of the present invention has a cross-sectional shape as shown in FIG. The strip 10 is molded from a material such as polyvinyl chloride, polyethylene, polypropylene polycarbonate, polyester, or a resin obtained by reinforcing these resins with glass fiber.

The strip-shaped body 10 has a large number of reinforcing ribs 19 each having a T-shaped cross section on the back side of a strip-shaped substrate 12 . A fitting protrusion 13 is erected on one side edge of the back surface of the substrate 12 on which a large number of reinforcing ribs 19 are erected. The other side edge of the substrate 12 is a stepped portion 14 that is stepped down to the back side by the thickness of the substrate 12 so that the side edge of the substrate 12 provided with the fitting protrusion 13 can be engaged. , the stepped part 14
A fitting groove 15 is provided in which the fitting protrusion 13 can be fitted with a slight gap.

Such a band-shaped body 10 includes a fitting protrusion 13 and a reinforcing ridge 19.
, by spirally winding the substrate 12 with the fitting groove 15 upright so that the back side thereof becomes the outer circumferential surface, and the fitting protrusion 13 fitting into the space within the fitting groove 15. , a spiral tube with a predetermined diameter. At this time, the side edge 16 of the stepped portion 14
is locked to the adjacent reinforcing rib 19.

The strip lO is wound around a strip drum and placed on the ground near the manhole 82, and the strips 10 are sequentially unwound from the strip drum, and as shown in FIG. A helical pipe 10° is formed by a pipe making machine 20 installed inside the pipe and driven by a hydraulic motor 22.

The pipe making machine 20 has a belt-shaped body 1 introduced into the pipe making machine 20.
0 is forcibly bent by pipe-making rollers 21 disposed on the cylindrical circumferential surface with a predetermined helical angle to form the strip 10.
Wind in a spiral. Then, as shown in FIG. 4, the fitting protrusion of the strip 10 newly introduced into the pipe making machine 20 is inserted into the space in the fitting groove 15 of the helically wound strip IO. Article 13 is inserted. When the fitting protrusion 13 is inserted into the space within the fitting groove 15, the fitting protrusion 13 is inserted into the fitting groove 1.
The removal is stopped at 5, and the side edges of the adjacent strips 1o are engaged with each other. At this time, the side edge 1 of the stepped portion 14
6 is locked to a reinforcing rib 19 adjacent to the fitting protrusion 13.

In the lining method of the present invention, the pipe making machine 20
When the fitting protrusion 13 of the band-shaped body 10 newly introduced into the pipe-making machine 20 is fitted into the space of the fitting groove 15 of the band-shaped body ■0 spirally wound at Between the opposing surfaces of the stepped part 14 in which the fitting groove 15 is provided and the side edge of the substrate 12 fitted in the film forming part 14 on the side where the fitting protrusion 13 is provided. , a band-shaped wire rod 3o is interposed.

One side edge of the strip-shaped wire 30 is located between the end surface of the substrate located within the step-down portion 14 and the facing surface of the film-forming drop-off portion 14 . The band-shaped wire 3o is constructed by, for example, a synthetic resin made of a softer material than the band-shaped body 10, and a large number of glass fibers extending in the longitudinal direction as tensile members are arranged in parallel in the width direction. The width of the strip wire 30 is preferably as large as possible;
The distance between the end face and the fitting protrusion 13 is about (3 to 6). The thickness of the band-shaped wire rod 30 is set to 1, so that both the stepped part 14 and the side edge of the substrate 12 in the film-forming part 14 can be securely pressed against each other to reliably prevent them from sliding. ~
It is about 2-.

When inserting the fitting protrusion 13 into the space of the fitting groove 15, the strip wire 30 is inserted into the substrate 12 adjacent to the fitting protrusion 13.
are arranged along the side edges and side edges of the

Then, when the fitting protrusion L3 is inserted into the space of the fitting groove 15, the band-shaped wire 30 is connected to the stepped part 14 and the film forming part 1.
It is sandwiched between the side edge of the substrate 12 fitted into the substrate 4 and the side edge. The band-shaped wire rod 30 has the stepped part 14 and the side edge of the substrate 12 fitted in the film forming part 14 in an inclined state, and the fitting protrusion 13 inserted into the fitting groove 15 is inclined. Strongly engage the fitting groove I5. As a result, the fitting protrusion 13 on the substrate 12 and the reinforcing rib 1 adjacent to the fitting protrusion 3
The open part of the band 9 is strongly surface-pressed to the couplet surface of the stepped part 14, and the side edges of the spirally wound band 10 are
They are held in a firm lock to prevent them from sliding against each other. At this time, the tip of the side edge portion 16 connected to the stepped portion 14 is engaged with the reinforcing rib 19 adjacent to the fitting protrusion I3, and the film forming portion 14 is fitted into the stepped portion 14. It is strongly pressed against the combined substrates 12, and the side edges of the spiral tube shaped strip 10 are more firmly locked together. ) The fitting protrusion 13 inserted into the fitting groove 15 is prevented from being removed from the fitting groove 15, so that the helical tube 10' manufactured by the pipe making machine 20 has an expanded diameter. It is maintained at a predetermined diameter and propelled through the sewer pipe 31 without any movement.

In this way, when the helical tube 10° in which the side edges of the mutually adjacent strips IO are firmly locked is manufactured, the helical tube 10' is directly lowered from the tube making machine 20. It is inserted into the water pipe 81. The spiral pipe 10' is a sewer pipe 81.
It is propelled in the axial direction while rotating. At this time, since the outer diameter of the spiral pipe 10' is sufficiently smaller than the inner diameter of the sewer pipe 81, the spiral pipe 10' is connected to the sewer pipe 81 except for the bottom part.
It is smoothly propelled inside the sewer pipe 81 without almost contacting the inner circumferential surface. Furthermore, even if the spiral pipe 10' contacts the inner circumferential surface of the sewer pipe 81, since its diameter is small, the spiral pipe 10'
The resistance received from the inner circumferential surface of the sewer pipe 81 is small, and the spiral pipe 10' is smoothly propelled through the sewer pipe 81.

In this way, when the spiral pipe 10' is inserted into the sewer pipe 81 and its tip extends into the manhole 83, as shown in FIGS.
3, the spiral tube 10' is
The diameter of the tip is expanded. The tip diameter expanding tool 6o includes a support rod 61 horizontally installed in the manhole 83, and a pair of telescoping rods 62 attached to the support rod 61 in a perpendicular manner.
and 62. The support rod 61 is horizontally fixed at a position facing the sewer pipe 81 through which the spiral pipe 10' is inserted. Each telescoping rod 62 connects the support rod 61 to the sewer pipe 8.
The base end portion is fixed to the support rod 61 so as to extend toward the support rod 61 . Each of the telescopic rods 62 is extendable and retractable, and has a predetermined overall length so that the fixed member 6
2a.

A connecting plate 63 is attached to the tip of each telescopic rod 62 so as to be in a substantially vertical state, and a holding tube 64 is attached to the connecting plate 63 in a horizontal state. The holding tube 64 has an inner diameter that is similar to or slightly smaller than the inner diameter of the sewer pipe 81, and therefore larger than the outer diameter of the helical pipe 10'. An abutting plate 65 is attached to the surface of the connecting plate 63 on which the holding tube 64 is attached so as to be located inside the holding tube 64. The contact plate 65 is made of vinyl chloride, stainless steel, or the like, which has a small surface friction coefficient.

Such a tip expander 60 is installed in the manhole 83 when the tip of the helical tube lO° extends into the manhole 83. Before attaching the tip diameter expander 60 into the manhole 83, the strip wire 30 is removed from the tip of the spiral pipe 10'' extending into the manhole 83. The tip diameter expander 60 has a holding tube 64 connected to a sewer pipe 81.
The support rod 61 is horizontally installed within the manhole 83 and defined within the manhole 83 so as to be held concentrically with the manhole 83 . When the outer diameter of the holding tube 64 is smaller than the inner diameter of the drain pipe 81, the tip of the holding tube 64 is connected to the drain pipe 81.
In addition, the sewer pipe 81
In the case of the same outer diameter, the length of each telescoping rod 62 is adjusted so that it abuts against the peripheral part of the end face of the sewer pipe 81, and the length of each telescoping rod 62 is fixed by the fixing member 62a. be done.

In this state, the pipe making machine 20 is driven again, the strip lO is fed to the pipe making machine 20, and the spiral pipe 10' is advanced while rotating. As a result, the tip of the spiral tube 10° extending into the manbow portion 83 moves forward within the holding tube 64 and abuts against the abutting plate 65 attached to the connecting plate 63. In this state, when the pipe making machine 20 is roughly driven and the spiral tube 10° is rotated, a propulsive force is applied to the band-shaped body 1O forming the spiral tube 10°. At this time, the band-shaped wire rod 30 sandwiched between the stepped part 14 at the tip of the spiral tube 10'' and the side edge of the substrate 12 engaged in the film forming part 14 is released. Because of this, there is a gap between the stepped portion 14 of the helical tube 10° and the side edge of the substrate I2 within the film-formed falling portion I4, and the stepped portion 14 and the inside of the film-formed falling portion 14 have a gap. The firm locking state between the side edge portion of the substrate 12 and the side edge portion of the substrate 12 is released. In addition, since the tip of the spiral tube 10' is in a state where the surface is abutted against the contact plate 65 having a low coefficient of friction, the tip of the spiral tube 10' can smoothly slide against the contact plate 65. Rotate in contact. Then, by preventing the spiral tube 10' from moving forward by the corresponding contact plate 65, a propulsive force is applied to the band-shaped body 10 constituting the spiral tube 10', and the strip body 10 is inserted into the fitting groove 15. The fitting protrusion 13 smoothly slides within the fitting groove 5 and is gradually enlarged in diameter.

In this way, when the diameter of the tip of the helical tube lO' is expanded, the strip wire rods 30 are sequentially removed from the tip of the helical tube 1 (1').
There is a gap between the stepped portion 14 of the spiral tube 10′ and the side edge of the substrate 12 within the film-formed portion 14, so that the stepped portion 14 and the side edge of the substrate 12 within the film-formed portion 14 are separated. The strong crimped state between the fitting groove 15 is released, and the fitting protrusion 13 inserted into the fitting groove 15 is in a state where it can smoothly slide within the fitting groove 15. Then, when the pipe making machine 20 is driven by the hydraulic motor 22, a propulsive force is applied to the 10° spiral pipe strip extending through the sewer pipe 81. The spiral tube 10
Because the tip of the strip 10 in the spiral pipe 10' is fixed so that it does not move forward inside the manhole 83,
The fitting groove 15 and the fitting protrusion 13 fitted in the fitting groove 15 slide against each other, and the diameter of the helical tube 10' is sequentially expanded from the fixed tip side. Expanded spiral tube 10'
is in close contact with the inner circumferential surface of the sewer pipe 81.

In the above embodiment, a strip wire is interposed between each side edge of the spirally wound strip to prevent each side edge from sliding, and the strip wire is separated. Although the helical tube is configured to expand in diameter, the present invention is not limited to this embodiment. For example, a configuration in which a helical tube is manufactured by bonding each side edge of a helically wound strip with an adhesive tape, and the diameter of the helical tube is expanded by cutting the adhesive tape, or The respective side edges of the band-shaped body wound around are locked by adhesively fitting the concave part and the convex part, and with the convex part adhesively fitted into the concave part, for example, the band-shaped body is placed in a locked state. The buried wire may be detached from the strip and cut to expand its diameter.

In the embodiment described above, the tip diameter expander 60 is inserted into the manhole 83.
However, the present invention is not limited to this, and by contracting the telescopic rod 62 when the tip of the helical tube 10' hits the contact plate 65, the helical tube 10° is fixed. A pressing force may be applied to the tip in a direction opposite to the forward direction of tube manufacturing. In this case, the original spiral tube l
If the amount of extension of O° into the manhole 83 is kept small, the tip of the 10° spiral pipe will be in the manhole 8 when the diameter is expanded.
This is preferable because it can be made flush with 3.

(Effects of the Invention) In this way, the existing pipe lining method of the present invention involves fitting a retaining pipe having an inner diameter almost the same as the existing pipe into the tip of a small-diameter helical pipe inserted through the existing pipe. Since the forward movement of the helical tube is prevented by the abutment plate of the holding tube, and the propulsive force is applied to the band-shaped body constituting the helical tube, the tip of the helical tube is in contact with the inner circumferential surface of the holding tube. The diameter is definitely expanded. Since the diameter of the tip of the helical tube is expanded by applying a propulsive force to the band-shaped body constituting the helical tube, there is no possibility that the side edges of the band-shaped body will come out of engagement.

4. Figures 1 and 2 are cross-sectional views showing the implementation steps of the lining method of the present invention, Figure 3 is a cross-sectional view of the strip, and Figure 4 is a cross-sectional view of the strip where the side edges are connected to each other. FIG. 5 is a plan view of the distal end diameter expander, and FIG. 6 is a side view thereof.

DESCRIPTION OF SYMBOLS 10... Band-shaped body, 10'... Spiral tube, 12... Substrate, 13... Fitting protrusion, 14... Stepped part, 15...
... Fitting groove, 20 ... Pipe making machine, 2200. Hydraulic motor 30...Strip wire rod, 60...Tip diameter expander, 6
1...Support rod, 62...Extension opening/nod, 63...
Connecting plate, 64... Holding tube, 65... Contact plate.

that's all

Claims (1)

[Claims] 1. A step of manufacturing a helical tube by winding a strip and locking the side edges of adjacent strips, and sequentially inserting the manufactured helical tube into an existing pipe. the inserted helical tube into the existing pipe to extend the tip from the existing pipe; and the step of strengthening the side edges of the strips at the tip of the spiral tube extending from the existing pipe. At the same time, a holding pipe having an inner diameter approximately the same as that of the existing pipe is fitted into the tip of the spiral pipe extending from the existing pipe so as to be concentric with the end of the existing pipe. a step of attaching the helical tube, applying a propulsive force to the strip forming the helical tube, and preventing the tip of the helical tube from moving forward in the axial direction so that the tip of the helical tube comes into contact with the inner circumferential surface of the holding tube; A lining method for existing pipes that includes the process of expanding the diameter to .