JPH04194475A - Lining construction method for existing pipe - Google Patents

Abstract

PURPOSE:To insert a helical pipe of small diameter easily diameter-spread in an almost closely attached condition to an internal peripheral surface of an existing pipe by successively inserting the helical pipe, press-fitting a wire rod between side surfaces, into the existing pipe, and detaching the wire rod to spread the diameter while giving propulsive force in a condition that a band- shaped unit point end is fixed. CONSTITUTION:At the time of winding, a band-shaped unit 10, stopped in a condition that both side the fellow edge parts mutually piled together can be slided in the lengthwise direction, is helically wound and also press-fitting a wire rod 30, so that both side the fellow edge parts are prevented from sliding, between a step differenced part 14a, placing one side edge part in a step dropping condition, and a side surface 12a in the other side edge part opposed to the step differenced part 14a to manufacture a helical pipe 10'. The manufactured helical pipe 10' is successively inserted into an existing pipe 81, and the wire rod 30 is detached from the helical pipe 10' to spread its diameter while giving propulsive force to the band-shaped unit 10 in a condition that a point end of the band-shaped unit of the helical pipe 10' is fixed to the existing pipe 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 water leakage.

For this reason, recently, synthetic resin pipes are inserted into existing pipes such as aged buried pipes to line them.

One of the methods for lining existing pipes is a method of lining existing pipes with a spiral pipe 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 be locked to each other, and the pipe-making machine winds the strips in a spiral shape, and by the winding. A helical tube is sequentially manufactured by locking the side edges of adjacent strips to each other. The manufactured spiral tubes are sequentially rotated and guided out of the 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
A method of increasing the resistance between the locked side edges of the band by locking a wire between the locked side edges of the band when the band is wound around a spiral tube. developed. An example of a strip used in such a method is shown in Fig. 8. The strip 90 has a large number of reinforcing ribs 99 on the back side of the substrate 92, and the back side is extended by the thickness of the substrate 92 so that one side edge can fit into the other side edge. There is a stepped part 94 which is stepped down to the side. A semicircular locking groove 95 is provided on the back side of the protective film falling part 94, and a fitting part 92 which is a side edge of the other substrate 92 that fits into the protective film falling part 94 is provided.
A locking protrusion 93 is erected on b. When the fitting portion 92b is fitted into the stepped portion 94, the fitting portion 92b is fitted into the stepped portion 94.
The locking protrusion 93 of 2b is fitted into the locking groove 95,
Both are slidably locked relative to each other.

In such a band-shaped body 90, when the fitting portion 92b is fitted into the stepped portion 94 by winding it in a spiral shape, and the locking protrusion 93 is fitted into the locking groove 95, the stepped portion 94 and fitting part 9
2b, a flat wire rod 7 is placed between the faces facing each other in the thickness direction.
0 is interposed.

If a helical tube is manufactured in this way, the resistance between the side edges of the strip forming the helical tube will increase due to the wire.
There is no risk that the stepped portions 94 and the fitting portions 92b of the strip 90 that overlap each other will slide against each other, and a small-diameter helical tube is 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 applying a propulsive force to the belt-like body that constitutes the spiral pipe, If the wire is separated from between the side edges of the strip, 1. From the part where the wire rod is removed, the side edges of each band-shaped body sequentially slide against each other, and the diameter of the helical tube is expanded while rotating. Then, the diameter-expanded spiral tube comes into almost contact with the inner circumferential surface of the existing tube.

However, since the wire rods 70 are interposed between the facing surfaces of the stepped portion 94 and the fitting portion 92b located in the fitting portion 92b, they overlap each other as shown in FIG. The stepped portion 94 and the fitting portion 92b, which are in the tilted state, are in an inclined state. In particular, since the bending force acts on the fitting portion 92B located within the step-down portion 94, the tip of the locking protrusion 93 fitted into the locking groove 95 moves away from the locking groove 95. It will come off easily. When the tip of the locking protrusion 93 comes out of the locking groove 95, the step-down portion 94 and the fitting portion 92B that overlap each other become easier to slide against each other, and before the wire rod 70 is removed. There is a risk that the diameter of the spiral tube may expand inadvertently.

The present invention solves the above-mentioned conventional problems, and its purpose is to prevent the small diameter spiral tube from expanding during tube manufacturing even when a small diameter spiral tube is manufactured by spirally winding a band-shaped body. To provide a method for lining an existing pipe, which can easily expand the diameter of a small-diameter helical pipe to a state where it is in close contact with the inner circumferential surface of the existing pipe, without the risk of the pipe becoming too large in diameter.

(Means for Solving the Problems) The lining method for existing pipes of the present invention is such that when the pipe is wound spirally, it is fitted onto one side edge so that the other side edge overlaps with the other side edge. A belt-like body is formed in a step-down state, and when the belt-like body is wound, the mutually overlapping side edges are locked so that they can slide in the longitudinal direction.
In addition to spirally winding, there is a stepped part on one side edge and a side surface of the other side edge opposite to the stepped part, so that the edges on both sides do not slide against each other. A step of manufacturing a helical tube by press-fitting a wire rod into the existing tube, a step of sequentially inserting the manufactured helical tube into an existing tube and inserting the helical tube into the existing tube, and a step of inserting the tip of the strip in the helical tube into the existing tube. While applying a propulsive force to the strip forming the spiral tube while the wire is fixed to the spiral tube, detaching the wire from the spiral tube,
and a step of expanding the diameter of the helical tube, thereby achieving the above object.

(Function) In the lining construction method of the present invention, in order to prevent the side edges of the spirally wound strip from sliding against each other, a stepped portion at one side edge that is in a stepped state; Since a wire is interposed between the side surface of the other side edge facing the stepped portion, the wire rod allows the side edges that overlap each other to maintain a nearly parallel state. do,
Prevents both from sliding. The wire rod can be easily removed from between the stepped portion and the side surface, and by removing the wire rod, the overlapping side edge portions can easily slide against each other.

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

For example, as shown in FIG. 3, the existing pipe lining construction method of the present invention can be applied to
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 formed into a 10° helical tube using a tube making machine 20 driven by a hydraulic motor (not shown). The pipe making machine 20 is installed in a manhole 82 to which one end of a sewage pipe 81 is connected, and the pipe making machine 20 is installed in a manhole 82 to which one end of a sewage pipe 81 is connected.
are sequentially introduced into the sewer pipe 81. At this time, the spiral pipe 10° has at least a portion other than the bottom part of the sewage pipe 81.
The outer diameter is made sufficiently smaller than the inner diameter of the sewer pipe 81 so as not to contact the inner circumferential surface.

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.

When the strip 10 is wound spirally, the one side edge and the other side edge overlap each other. The strip-shaped body 10 includes a strip-shaped substrate 12 and a stepped portion 14 on one side edge of which is stepped down by the thickness of the substrate 12.
It has The other side edge of the substrate 12 is cut to form a fitting portion 12b that fits into the protective film dropping portion 14. A locking protrusion 13 is provided upright on the back side of the fitting portion 12b. A fitting portion 1 having a semicircular cross section is provided at the tip of the locking protrusion 13.
3a is provided. Moreover, on the back side of the board 12,
A large number of reinforcing ribs 19 each having a T-shaped cross section are provided.

The stepped portion 14 is connected to the substrate 12 via a stepped portion 14a, and the stepped portion 14 has a locking groove into which the locking protrusion 13 can be fitted with a slight gap. 15 are provided. The locking protrusion 13 has a fitting part 13a having a semicircular cross section at its tip, and the locking groove 15 has a fitting part 13a having a semicircular cross section.
It has a semicircular cross section. Then, the locking protrusion 1 is inserted into the opening in the locking groove 15 into which the locking protrusion 13 is inserted.
A pair of locking portions 15a that lock into the fitting portions 13a of No. 3 are provided facing each other. A reinforcing rib 17 having a T-shaped cross section is provided in the stepped portion 14 in parallel with the locking groove 15 .

Such a belt-like body 10 includes a locking protrusion 13 and a reinforcing rib 19.
, the substrate 12 on which the locking portion 11115 is erected is wound spirally so that the back side is on the outer peripheral side, and the fitting portion 13a of the locking protrusion 13 is fitted into the space in the locking groove 15. This results in a helical tube with a predetermined diameter. Thereby, no step is formed on the inner circumferential surface of the spiral tube 10'. When the fitting portion 13a of the locking protrusion 13 is fitted into the locking groove 15, both can slide relative to each other. Then, when the side surface 12a of the other side edge of the substrate 12 that is fitted into the stepped portion 14 is fitted into the protective film dropped portion 14, the side surface 12a of the other side edge of the substrate 12 is slightly attached to the stepped portion 14a of the stepped portion 14. They face each other with a distance of .

The strip 1O is wound around a strip drum and placed on the ground near the manhole 82, and the strip 1O is sequentially unwound from the strip drum until it reaches the manhole 82, as shown in FIG. A spiral pipe 10' is formed by a pipe making machine 20 installed inside the pipe and driven by a hydraulic motor (not shown). The pipe making machine 20 forcibly bends the strip 10 introduced into the pipe making machine 20 by pipe making rollers 21 disposed on the cylindrical circumferential surface with a predetermined helical angle. , the strip 10 is wound spirally. Then, the fitting portion 13a of the distal end of the locking protrusion 13 of the belt-like object 1O newly introduced into the pipe-making machine 20 is inserted into the space in the locking groove 15 of the spirally wound band-like object IO. is inserted. At this time, as shown in FIG. 5, the lubricant 16 is applied by the nozzle 24 to the area adjacent to the locking protrusion 13 on the other side edge of the overlapping state where the side edge 14b of the stepped portion 14 is overlapped. is applied. As this lubricant 16, for example, -liquid moisture-curing urethane is used, which does not harden for a short time (about 4 hours) after being applied until the diameter of the spiral tube 10° is expanded.

In the lining method of the present invention, the pipe making machine 20
When the locking protrusion 13 of the belt-like body IO newly introduced into the pipe-making machine 20 is fitted into the space of the locking groove 15 of the belt-like body 10 spirally wound in , the stepped portion 14a of the stepped portion 14 where the locking groove 15 is disposed, and the side surface 12a of the side edge on the side where the locking protrusion 13 is provided on the board 12 fitted in the incorrectly installed stepped portion 14. As shown in FIG. 5, a wire rod 30 having a rectangular cross section and guided by a wire rod guide 2S is interposed in the gap. The strip material 30 has a height (a dimension in the thickness direction of the substrate 12) that is approximately equal to or slightly larger than the thickness of the substrate 12, and a width that is approximately equal to or slightly larger than the thickness of the substrate 12.
The gap between the stepped portion 14a of the stepped portion 14 and the side surface 12a of the substrate 12 is approximately equal to or slightly larger (0.5 to 1.0
■Extent) It is getting bigger.

The wire 30 connects the stepped portion 14a of the stepped portion 14 and the substrate 12.
As shown in FIG. 12 in parallel relative to the width direction. Therefore, the outer circumferential surface of the substantially half portion of the locking protrusion 13 comes into close contact with the substantially half inner circumferential surface of the locking groove 15, and the locked state between the two becomes even stronger. Therefore, the helical pipe lO° manufactured by the pipe making machine 20
The sewer pipe 8 is maintained at a predetermined diameter without expanding.
Promoted within 1.

In this way, when the helical tube 10° in which the side edges of the mutually adjacent strips lO 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 lO" is the 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' except for the bottom part is connected to the sewer pipe 81.
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 to' smoothly propels inside the sewer pipe 81. When the tip of the spiral pipe to' in the propulsion direction reaches the end of the sewer pipe 81, as shown in FIG. The strip wire 30 at the tip of lO° is removed by a predetermined amount, and the helical tube lO°
The diameter of the helical tube 1 is expanded by rotating the tip end in the opposite direction to the direction of rotation of the helical tube 10 when manufacturing the tube.
The tip of the strip 10 at 0° is fixed to the end of the sewer pipe 81.

In this state, the pipe making machine 20 is driven again, the strip 10 is fed to the pipe making machine 20, and a propulsive force is applied to the strip 10 constituting the spiral pipe 10'. At this time, at the same time as the pipe making machine 20 is driven, the stepped portion 1 at 10° of the spiral pipe is
The wire rod 30 sandwiched between the stepped portion 14a of No. 4 and the side surface 12a of the substrate 12 fitted in the incorrectly installed fallen portion 14 is sequentially removed from the side to which the spiral tube 10' is fixed. Ru.

As a result, there is a gap between the locking groove 15 in the stepped portion 14 of the spiral tube 10' and the fitting part 13a at the tip of the locking protrusion 13 fitted into the locking groove 15. , the strong fixation between the two is released, and the fitting portion 13a inserted into the locking groove 15 is in a state where it can smoothly slide within the locking groove 15. When the pipe making machine 20 is driven by a hydraulic motor (not shown), the sewer pipe 81
A propulsive force is applied to the 10° band-shaped body of the spiral pipe inserted through the inside of the spiral pipe 10', and the tip of the band-shaped body 10 in the spiral pipe 10' reaches the sewage pipe 8.
1, the locking groove 1 of the band-shaped body 10
5 and the fitting portion 13a fitted in the locking groove 15 slide together, and the diameter of the helical tube lO° is expanded sequentially from the distal end side. At this time, since a lubricant is applied between the side edge 14b of the stepped portion 14 and the area adjacent to the locking protrusion 13 on the other side edge of the substrate 12, the relationship between the two becomes even stronger. Can slide smoothly. The spiral pipe lO° whose diameter has been expanded is in almost intimate contact with the inner circumferential surface of the sewer pipe 81.

After such diameter expansion, the side edge 14b of the stepped portion 14 at 10° of the spiral tube and the other side edge of the substrate 12,
By hardening the lubricant 16 applied between the area adjacent to the locking protrusion 13, the water-stopping property in that area is improved.

In this way, the sewage pipe 81 is lined with the spiral pipe.

In addition, in the lining method of the present invention, the spiral pipe lO"
As the wire rod 3o used to keep the diameter small,
The cross section is not limited to a rectangular shape, but may be, for example, a trapezoidal cross section as shown in FIG. 6(A), or a circular cross section as shown in FIGS. 6(B) and (C). As shown in FIG. 6(B), when the wire rod 30 has a circular cross section with a relatively large diameter, the stepped portion 14a of the stepped portion 14 and the stepped portion 14a
The side surface 12a of the fitting portion 12b facing the surface may be a concave arc-shaped surface. Furthermore, as shown in FIG. 6(C), when the wire rod 30 has a relatively small diameter, the stepped portion 14a of the stepped portion 14 and the fitting portion 1 facing the stepped portion 14a
The side surface 12a of 2b may be formed into a groove having a triangular cross section.

Further, as shown in FIG. 7, the stepped portion 1 of the stepped portion 14
4a and the side surface 12a of the fitting portion 12b facing the stepped portion 14a, a sawtooth locking portion may be formed in order to improve the locking force of the wire 30.

(Effects of the Invention) In this way, the existing pipe lining method of the present invention interposes a wire rod between the stepped part of the stepped part of the strip and the side surface of the other side edge opposite to the stepped part. In order to form a small-diameter helical tube, the overlapping side edges are firmly locked together, and there is no risk of them slipping. Therefore, the small-diameter helical tube can be inserted reliably into the existing pipe. That's Tekiru. Since the wire rod can be very easily removed from the small diameter helical tube, the diameter of the helical tube inserted into the existing pipe is expanded very easily, and the wire is brought into close contact with the inner circumferential surface of the existing pipe.

4. ゛ Nona: B. Figure 1 is a cross-sectional view of a strip used in the lining method of the present invention, Figure 2 is a cross-sectional view of the main part of a belt-shaped body whose side edges are locked together, and Figure 3 and Fig. 4 are cross-sectional views showing the implementation steps of the lining method of the present invention, Fig. 5 is a schematic diagram showing the manufacturing state of the spiral pipe, and Figs. 7 is a perspective view of yet another embodiment of the strip, FIG. 8 is a sectional view of the strip used in the conventional lining method, and FIG. 9 is a cross-section of the strip when in use. It is a diagram.

DESCRIPTION OF SYMBOLS 10... Band-shaped body, 10'... Spiral tube, 12... Substrate, 12a... Side surface, 12b... Fitting part, 13...
・Latching protrusion, 13b... Fitting part, 14... Stepped part, 15... Fitting groove, 15a... Locking part, 2o...
・Pipe making machine.

that's all

Claims (1)

[Claims] 1. One side edge is stepped so that when it is wound spirally, the other side edge is fitted in an overlapping state, and the winding When turning, a band-shaped body is wound in a spiral manner so that the overlapping edges on both sides are slidable in the longitudinal direction, and a step is formed on one side edge. A step of manufacturing a spiral tube by press-fitting a wire rod between the part and the side surface of the other side edge facing the stepped part to prevent the two side edges from sliding, and inserting the manufactured spiral tube into the existing pipe. a step of sequentially inserting the spiral tube into the existing pipe, and applying a propulsive force to the strip forming the spiral tube with the tip of the strip in the spiral tube fixed to the existing pipe; A method for lining an existing pipe, comprising: removing the wire from the helical pipe and expanding the diameter of the helical pipe.