JPH04131578A - Band material used for existing pipe lining method - Google Patents

Abstract

PURPOSE:To enable the smooth propulsion of a spiral pipe inside an existing pipe by interposing band material provided with such thickness as to be press-bonded to the opposed side edge parts of banded bodies wound spirally in a lining method, and also provided with hardness lower than that of the banded body and the coefficient of static friction higher than that of the banded body. CONSTITUTION:Band material 30 is interposed between a stepped part 14 and a fitting protrusion 13 side edge part at the time of fitting the insertion part 13b of the fitting protrusion 13 of a newly fed banded body 10 into the fitting recession 15 of a banded body 10 wound spirally by a pipe manufacturing machine 20. Since this band material 30 is lower in hardness and higher in the coefficient of static friction than the banded body 10, the side edge parts of both banded bodies 10 are locked rigidly to each other. A spiral pipe 10' is thereby driven forward smoothly in a sewer pipe 81 without the diameter of the spiral pipe 10' being enlarged. When the tip of the spiral pipe 10' reaches the end part of the sewer pipe 81, the manufacture of the spiral pipe 10' is stopped once, and its tip is fixed to the sewer pipe 81. The pipe manufacturing machine 20 is driven again to detach the band material 30 successively from the fixed side of the spiral pipe 10'. Then the spiral pipe 10' is enlarged in diameter from the tip side so as to be adhered to the inner peripheral surface of the sewer pipe 81.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is applied to an existing pipe lining method carried out when rehabilitating aged existing pipes, in which a band-shaped body made of synthetic resin is spirally wound. This invention relates to a band material used to maintain a spiral tube manufactured in a predetermined diameter at a predetermined diameter.

(Prior Art) Metal pipes and humid pipes have long been used as underground pipes used for sewerage and drainage systems.

Such buried pipes become obsolete after long-term use, and there is a risk of water leakage due to cracks or corrosion. 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 so as to face the end opening of the 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 manufactured spiral tube is sequentially guided out of the tube making machine while rotating. 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.

As the material of the band-shaped body which is a spiral tube, a flexible synthetic resin such as polyvinyl chloride, polyethylene, polypropylene, etc. is used. The strip usually has a convex line continuous in the longitudinal direction on one side edge, and a concave line continuous in the longitudinal direction on the other side edge with which the convex line can engage. It is set up as follows. Then, when the band-shaped body is wound spirally, the grooves are fitted into the convex lines on the side edges of the mutually adjacent band-shaped bodies to form a spiral tube.

(Problems to be Solved by the Invention) In such a lining construction method, a spiral pipe inserted into an existing pipe is propelled through the existing pipe while rotating. For this reason, when a helical tube with an outer diameter slightly smaller than the inner diameter of the existing pipe is inserted into an existing pipe, almost the entire outer circumferential surface of the helical tube will come into contact with the inner circumferential surface of the existing pipe, and a large amount of resistance will be applied to the helical tube. . The belt-shaped bodies are sequentially supplied to a pipe-making machine that manufactures spiral pipes, and the spiral pipes produced by the pipe-making machine are sequentially led out from the pipe-making machine. When resistance is applied to the pipe, the spiral pipe is not propelled through the existing pipe, and the pipe-making machine sends out the strips one after another as a spiral tube, which applies propulsive force to the strips in the spiral tube, causing them to fit into each other. The convex and concave lines begin to slide out, and the diameter of the helical tube increases. In this way, when the diameter of the helical tube becomes large (as the diameter of the helical tube increases, the contact resistance between the helical tube and the existing pipe becomes large, and the helical tube cannot be propelled through the existing pipe).

For this reason, in conventional lining construction methods, in order to prevent almost the entire outer peripheral surface of the spiral pipe from coming into contact with the inner peripheral surface of the existing pipe, the inner diameter of the spiral pipe is made sufficiently smaller than the inner diameter of the existing pipe. Progress is being made. Therefore,
In existing pipes that have been lined using the conventional lining method, the part through which fluid flows (inside the spiral pipe) is significantly smaller than the original part through which fluid flows (inside the existing pipe).
The flow rate of fluid after lining is significantly lower than the flow rate of fluid before lining.

Furthermore, if the difference in internal diameter between the existing pipe and the helical pipe becomes large, the helical pipe may tilt relative to the existing pipe. The pipe must be fixed to the existing pipe. When the difference in inner diameter between the existing pipe and the spiral pipe becomes large, a large amount of backfilling material is required, which makes the backfilling work very time-consuming and impairs economic efficiency.

In order to solve such problems, the inventors of the present invention have proposed that when winding a strip around a helical tube, a wire is locked between the protruding and protruding side edges of the strip. We developed a method to increase the resistance between the side edges of the strip. However, sufficient resistance cannot be obtained by simply locking a wire rod having a circular cross section, and there is a risk that the diameter of the helical pipe to be manufactured will expand while being propelled through the existing pipe.

The present invention solves the above conventional problems, and its purpose is to provide a strip material that can reliably maintain a spirally wound strip material inserted into an existing pipe at a predetermined small diameter. It is about providing.

(Means for solving the problem) The strip material used in the existing pipe lining method of the present invention is
In the existing pipe lining method, in which the inner circumferential surface of an existing pipe is lined with a spirally wound band, a spirally wound band is lined on each side with the side edges facing each other. A flat strip interposed between mutually opposing side edges so that the spiral strip is held at a predetermined diameter with the edges slidably locked together. , has a thickness that can be pressed against each of the mutually opposing side edges of a spirally wound strip, and has a relatively high hardness lower than the hardness of the strip; It is characterized by a high coefficient of static friction against the surface, thereby achieving the above object.

(Function) The band material of the present invention is interposed between the opposing surfaces of each side edge when the band is spirally wound with the side edges sliding relative to each other. The strip material has a thickness that allows it to be crimped onto each opposing surface, and has a predetermined hardness and coefficient of static friction with respect to the strip material, so that the force applied to each side edge of the strip material is reduced. There is no risk of the side edges sliding against each other, and the helical tube formed by the strip is maintained at a predetermined diameter. After the helical tube is propelled through the existing pipe, the band material is removed from the helical tube, and the diameter of the helical tube is expanded so that it comes into close contact with the existing pipe.

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

The band material of the present invention is used, for example, in the lining method for existing pipes shown in FIGS. 2 and 3. This lining method is carried out when rehabilitating an existing concrete sewer pipe 81. In this lining construction method, first, a synthetic resin band 10 is formed into a spiral pipe 10' by a pipe making machine 20.
shall be. The pipe making machine 20 is installed in a manhole 82 to which one end of a sewer pipe 81 is connected, and the spiral pipes 10' that have been made are sequentially inserted into the sewer pipe 81. At this time, the spiral pipe 10' has at least a portion other than the bottom part that is connected to the sewer pipe 8.
The outer diameter is set to be sufficiently smaller than the inner diameter of the sewer pipe 81 so as not to contact the inner circumferential surface of the sewer pipe 81.

The strip 10 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 strip-shaped substrate 12 . The strip-shaped substrate 12 has, near one side 12a extending in the longitudinal direction,
A fitting protrusion 13 erected along the longitudinal direction of the substrate 12
has. The side surface 12a of the substrate 12 in the vicinity of the fitting protrusion 13 is gradually formed into an outwardly protruding inclined surface as it becomes a side surface opposite to the side surface on which the fitting protrusion 13 is disposed. It has become. The fitting protrusion 13 has a support portion 13a that is slightly longer than the thickness of the substrate 12, and an insertion portion 13b having a semicircular cross section provided at the tip of the support portion 13a. The upper surface of the insertion portion 13b protrudes in an arc shape, and each side portion of the lower portion thereof serves as a locking portion 13c that protrudes to each side of the column portion 13a.

The substrate 1 on the opposite side from the side edge on which the fitting protrusion 13 is erected.
When the substrate 12 is spirally wound, the side edge of
The side surface 12a of the board 12 on the side of the fitting protrusion 13 and the fitting protrusion 1
so that the portion of the substrate 12 between the proximal end of the
A stepped portion 14 is formed on the protruding side of the fitting protrusion 13 by the thickness of the substrate 12. In the stepped portion 14, a fitting concave line 15 having a semicircular cross-section and a space having a semicircular cross-section into which the insertion part 13b of the above-mentioned fitting protrusion 13 can fit is provided.
It is provided so as to protrude along the longitudinal direction of the substrate 12 in the same direction as the fitting protrusion 13 . A pair of locking portions 15a and 1 are provided on the inner circumferential surface of the proximal end of the fitting recess 15, with which each locking portion 13c of the insertion portion 13b of the fitting projection 13 can lock.
5a are arranged so as to protrude into the semicircular space, respectively. The insertion portion 13b of the fitting protrusion 13 is smoothly inserted into the fitting groove 15 from its arc-shaped peripheral surface, and the fitting protrusion 13 is engaged with the locking portion ISa of the fitting groove 15. By locking the stop portion 13c, the insertion portion 13b of the fitting protrusion 13 is prevented from being removed from the space of the fitting groove 15.

Insertion part 13 of fitting protrusion 13 inserted into fitting groove 15
b can slide within the fitting groove 15. When the insertion portion Hb of the fitting protrusion 13 is inserted into the fitting groove 15, the side surface 12a of the substrate 12 fitted into the stepped portion 14 is slightly different from the opposing surface of the stepped portion 14. A gap is created.

A pressing portion 16 is connected to the outer edge of the stepped portion 14 where the fitting groove 15 is provided, and the pressing portion 16 is inclined toward the protruding side of the fitting groove 15 with respect to the substrate 12 toward the outside. It is set up. Between the fitting protrusion 13 and the fitting groove 15 on the substrate 12, a plurality of reinforcing ribs 19 each having a T-shaped cross section are provided along the longitudinal direction of the substrate 12 at appropriate intervals. It is set up. Each reinforcing rib 19 has a column 19a that is orthogonal to the substrate 12, and a substrate 12 at the tip of the column 19a.
The flange portion 19b is parallel to the flange portion 19b, and the length of the support portion 19a is slightly larger than the thickness of the substrate 12. The reinforcing rib 19 adjacent to the fitting protrusion 13 is arranged adjacent to the fitting groove 15 when the insertion portion 13b of the fitting protrusion 13 is inserted into the fitting groove 15. Pressing part 1
The tip of the reinforcing ridge 19 comes into contact with the flange portion 19b of the reinforcing ridge 19.

Such a band-shaped body 10 includes a fitting protrusion 13 and reinforcing ribs 19.
, is spirally wound so that the surface side of the substrate 12 on which the fitting groove 15 is erected is on the outer peripheral side, and the insertion portion 13b of the fitting groove 13 is fitted into the space within the fitting groove 15. By doing so, it becomes a spiral tube.

The belt-like body 10 is produced by a pipe making machine 2 installed in a manhole 82.
0 makes it a spiral tube 10'. The pipe making machine 20 forcibly bends the band-shaped body IO introduced into the pipe making machine 20 with a pipe making roller 21 disposed on the cylindrical circumferential surface with a predetermined helical angle. The strip IO is wound spirally. Then, as shown in FIG. 5, a spirally wound strip 1
The insertion portion 13b of the fitting protrusion 13 of the band-shaped body 10 newly introduced into the pipe making machine 20 is inserted into the space within the fitting groove 15 of No. 0. The insertion portion 13b of the fitting protrusion 13 is the fitting groove 1
5, the locking portion 13c of the insertion portion 13b locks with the locking portion 15a of the fitting groove 15, thereby preventing the strips 10 from being removed. The side edges are slidably locked together. At this time, the tip of the pressing portion 16 connected to the fitting groove 15 disposed on the stepped portion 14 is connected to the reinforcing rib 1 adjacent to the fitting protrusion 13.
It is located between the flange L9a of No. 9 and the substrate 12.

In this way, the fitting protrusion of the strip 10 newly fed into the pipe making machine 20 is inserted into the space of the fitting groove 15 of the strip 10 spirally wound by the pipe making machine 20. When the insertion portion 13b of the strip 13 is fitted, the stepped portion 1 is provided with the fitting groove 15.
The band material 30 of the present invention is interposed between the facing surfaces of the substrate 12 fitted in the stepped portion 14 and the side edge on the side where the fitting protrusion 13 is provided.

The strip material 30 is, for example, a strip material 1 as shown in FIG.
A large number of glass fiber cords 32 extending in the longitudinal direction as tensile members are arranged in parallel in the width direction in a synthetic resin layer 31 made of a material that has a hardness lower than that of 0 and has a high coefficient of static friction with respect to the strip body 10. ing.

The width of the band material 30 is preferably as large as possible, but it is usually about the distance (3 to 6 degrees) between the side surface 12a of the substrate 12 engaged in the stepped portion 14 and the fitting protrusion 13. There is.

The thickness of the strip material 30 is determined so that when it is interposed between the opposing surfaces at each side edge of the strip material, it is pressed against each of the opposing surfaces. The difference between the thickness of the board 12 and the thickness of the board 12 is set to be slightly larger than the thickness of the board 12.
It is about m.

When inserting the insertion portion 13b of the fitting protrusion 13 into the space of the fitting groove 15, the band material 30 is attached to the side edge of the substrate 12 adjacent to the fitting protrusion I3 and the inclined side surface 12a. will be placed along the When the insertion portion 13b of the fitting protrusion 13 is inserted into the space of the fitting groove 15, the strip material 30 is inserted into the stepped portion 14 and the side of the substrate 12 fitted into the stepped portion 14. It is sandwiched between the edge and the side surface 12a. The strip material 30 has its negative side connected to the inclined side surface 12a of the substrate 12 and the stepped portion 1.
It is located between the opposing surfaces of 4. The strip material 30 has the stepped portion 14 and the side edge of the substrate 12 fitted in the stepped portion 14 in an inclined state, and is inserted into the fitting groove 15 of the fitting projection 13. The side surface 12a of the substrate 12 in the portion 13b
The side locking portion 13c is strongly locked to the locking portion 15a of the fitting groove 15. As a result, the fitting protrusion on the board 12 @
13 and the reinforcing rib 19 adjacent to the fitting protrusion 13 is strongly surface-pressed to the surface facing the stepped portion 14, and the side edges of the spirally wound strip 1o are It is firmly locked. At this time, the pressing part 16 connected to the stepped part 14
The tip end of is locked to the flange 19b of the reinforcing rib 19 adjacent to the fitting protrusion 13, and the stepped portion 14 is connected to the stepped portion 1.
4, and the side edges of the strip 10 formed into a spiral tube are more firmly locked together. Insertion part 1 of the fitting protrusion 13 inserted into the fitting groove 5
3b, the locking portion 13c is the locking portion 15 of the fitting groove 15.
By being locked to a, removal from the fitting groove 15 is prevented. Therefore, the helical pipe 10° manufactured by the pipe making machine 20 is propelled through the sewer pipe 81 without expanding in diameter and maintained at a predetermined diameter.

In this way, when the spiral tube 10' in which the side edges of the adjacent strips 10 are firmly locked together is manufactured, the spiral tube 10' is manufactured as shown in FIG. It is directly inserted into the sewer pipe 81 from the pipe machine 20. The spiral pipe 10' is rotated and propelled in the axial direction within the sewer pipe 81. At this time, the outer diameter of the spiral pipe 10' is kept at a predetermined diameter sufficiently smaller than the inner diameter of the sewer pipe 81, so that the spiral pipe 10' almost contacts the inner circumferential surface of the sewer pipe 81 except for its bottom. It is smoothly propelled through the sewer pipe 81 without causing any damage. Moreover, even if the spiral pipe 10 contacts the inner peripheral surface of the sewer pipe 81,
Because of its small diameter, the resistance that the spiral pipe 10' receives from the inner circumferential surface of the sewer pipe a1 is small, and the spiral pipe 10' is smoothly propelled through the sewer pipe 81.

When the tip of the spiral pipe 10' in the propulsion direction reaches the end of the sewer pipe 81, as shown in FIG. 10
``The tip is fixed to the end of the sewer pipe 81 by, for example, driving an anchor or the like.

In this state, the pipe making machine 20 is driven again, the strip 10 is fed to the pipe making machine 20, and the spiral pipe 10 tries to be propelled through the sewer pipe 81 while rotating again.

At this time, at the same time as the pipe making machine 20 is driven, the stepped portion 14 of the spiral tube 10 and the substrate 1 engaged within the stepped portion 14
The strip material 30 sandwiched between the side edges of the spiral tube 10°
Remove them in sequence, starting from the side where they are fixed. As a result, the strong pressure contact between the stepped portion 14 and the side edge of the substrate 12 within the stepped portion 14 is released, and the insertion portion of the fitting protrusion 3 inserted into the fitting groove 15 is released. 13b is in a state where it can smoothly slide within the fitting groove 15. Then, by driving the pipe-making machine 20, the belt-like bodies 10 are sequentially attached to the spiral pipe 10'' that has been made.
When the spiral tube 10' is fed, as shown in FIG.
Since the tip of the spiral pipe 10' is fixed to the drain pipe 81, there is a v! The inserted portions 13b of the fitting protrusions 13 that are fitted together slide against each other, and the diameter of the helical tube 10' is gradually expanded from the fixed distal end side.

Then, the diameter-enlarged spiral pipe 10' is brought into substantially close contact with the inner circumferential surface of the sewer pipe 81.

When the strip 30 is removed from the spiral tube 10', the spiral tube 1
0' gradually expands in diameter in the direction of propulsion and becomes tapered, and then comes into close contact with the inner circumferential surface of the sewer pipe 81.

That is, when the strip material 30 separates from the spiral tube 10'', a gap is created between the stepped portion 14 of the spiral tube 10'' and the portion of the substrate 12 within the stepped portion 14.As a result, the fitting The mating groove 15 and the insertion portion 13b of the mating protrusion 13 begin to slide, and the spiral pipe 10' expands in diameter.The axial length of the tapered portion varies depending on the diameter of the sewer pipe 81, etc. When the diameter of the sewer pipe 81 is 500 mm or less, it is preferable to set it to about 1 to 3 m for commuting.
When separating the strip material 30 from 0゛, the strip material 30 is removed from the winding device 50.
In the case of winding the strip material 30, it is preferable to control the winding speed of the strip material 30 by the winding device 50 so that the length of the tapered portion of the spiral tube 10° is always about 1 to 3 m.

A stepped portion 14 and a substrate 12 fitted within the stepped portion 14
In order to maintain the spirally wound band 10 at a predetermined diameter, the band material 30 interposed in the gap facing the synthetic resin layer 31 has a predetermined hardness and static friction coefficient. It has become. For example, if the diameter of the existing pipe is 300 m,
When the pipe length is 100 m, in order to maintain the diameter of the spiral pipe at 200 m by the band material 30, from the opposing surface of each side edge of the band-like body 10 to which the band material 30 is pressed, the diameter of the spiral pipe is 23 m.
Since a torque (shearing force) of 00 kg 1 cm or more is applied, a force (fixing force) is required to prevent the opposing surfaces from sliding due to the force.

In particular, when the temperature rises as in the summer, the hardness of the synthetic resin strip 10 and the synthetic resin layer 31 of the strip 30 decreases, so even at high temperatures (35 to 40 degrees Celsius),
A fixing force against a torque of 300 kgf-cm or more is required. Further, the hardness of the synthetic resin layer 3L in the strip material 30 needs to be lower than the hardness of the strip material 10 in order to prevent the strip material 10 from being damaged. For this purpose, 30 strips of
The hardness and coefficient of static friction are set to a predetermined state for the band-shaped body 10.

In the case where the strip 10 is made of hard vinyl chloride (rigid PVC), the fixing force of the strip 30 having the synthetic resin layer 31 whose hardness is lower than that of the strip 10 was studied and will be described below. As a material for the synthetic resin layer 31 whose hardness is lower than that of hard PVC, soft PV'C (plasticized PVC) and Infinite! !
L! PVC (+-f-ren-acetate canylacetate-vinyl chloride copolymer thermoplastic elastomer (Thermoplas
tic Elastoier, T P E ) no. 3
Selected type. For each material, as shown in Figure 6, the hardness was changed and a plurality of glass fiber cords 32 were embedded inside to manufacture the band material 30. There are two types of soft PVC (abbreviated as soft P-1 and soft P-2).
, 5 types of non-plastic PvC (non-P-1 to non-P-5)
), and there are three types of TPH (abbreviated as TP
E-1 to TPE3) were obtained.

In addition, the surface of unplasticized PVC coated with an adhesive (ethylene-vinyl acetate (EVA) system, 50 μm or less) is also available (abbreviated as P-free adhesive), and the coefficient of static friction at 3° of each strip material and The fixing force was measured. 7th result
and FIG. 8, respectively.

The hardness of each strip material 30 is the hardness determined by the spring type hardness test (Type A) used to measure the hardness of vulcanized rubber according to JIS K-6301. It is measured by bringing it into contact with the surface of the strip and reading the scale at that time.

In addition, the coefficient of static friction (μS) is measured by stacking a strip on a strip, placing a weight (Wkg) on top of it, pulling the strip horizontally, and measuring the maximum load (Fkg) when the strip begins to slide. Then, the calculation was performed based on F=μ,·W.

The band materials that can obtain the aforementioned fixing force of 2300 kgf-am are soft P-2, non-P-3, and non-P-3+viscous. As shown in FIG. 7, these have a static friction coefficient of 1.0 or more with respect to the hard vinyl chloride strip 10. The TPE strip 30 has a static friction coefficient of 1.0 or more with respect to the strip 10, but as shown in FIG.
Since the hardness is as low as 80 or less and it is easily deformed, the desired fixing force cannot be obtained. Thus, in order to obtain a predetermined fixing force, it is necessary to increase the hardness and the coefficient of static friction.

At around 40℃, the above-mentioned 230 (1kg-f-cm
In order to obtain this fixing force, it is desirable that the hardness be 80 or more and the static friction coefficient be 1.0 or more. If the hardness is 80 or less, when forces in mutually different directions are applied to each opposing surface of the strip 10 that compresses the strip, it is likely to deform and protrude from the cut-off portion 14 of the strip. Desired fixing force cannot be obtained. In addition, the coefficient of static friction against the strip is 1.0.
In the following cases, the force that actually fixes the opposing surfaces of the strips to each other cannot be obtained.

In this way, the synthetic resin layer 31 of the band material 30 has a hardness that is lower than the hardness of the band-shaped body which is a spiral tube, but is relatively high.
By providing a high coefficient of friction for the belt-shaped body 10, the helical tube to be manufactured can maintain a predetermined small diameter.

(Effect of the invention) The band material used in the existing pipe lining method of the present invention is
In this way, by specifying the hardness and manufacturing friction coefficient of a strip of helical tube, it is possible to reliably hold the helical tube at a small diameter, and therefore it is possible to insert the manufactured helical tube into the existing pipe. It can be promoted smoothly. Since the hardness of the strip is lower than that of the strip, there is no risk of the strip being damaged, and the spiral tube from which the strip is removed is smoothly expanded in diameter.

Figure 1 is a cross-sectional view of the strip material of the present invention, Figures 2 and 3 are cross-sectional views showing the implementation steps of the lining method using the strip material of the present invention, and Figure 4 is a cross-sectional view of the strip material of the present invention. Figure 5 is a sectional view of the main part of the belt-shaped body whose side edges are locked together, Figure 6 is a graph showing the relationship between the temperature and hardness of the synthetic resin layer in the belt material, and Figure 7 is a sectional view of the belt-shaped body. The figure is a graph showing the relationship between the temperature of the synthetic resin layer and the manufacturing friction coefficient, and FIG. 8 is a graph showing the relationship between the temperature of the synthetic resin layer and the fixing force.

10... Band-shaped body, lO゛... Spiral tube, 12...
- Substrate, 13... Fitting protrusion, 13b... Insertion part, L3c... Locking part, 14... Step-down part, 1
5... Fitting groove, 15a... Locking part, 2o...
・Pipe making machine, 30... Band material, 31... Synthetic resin layer,
32...Glass fiber cord.

that's all Rogandai Sekisui Chemical Co., Ltd. Representative: Kaori 1st figure Figure 7 Static thickness 1 coefficient of collapse and = Qr 3 constellations (T) 40(”C)

Claims (1)

[Claims] 1. In an existing pipe lining method in which the inner circumferential surface of an existing pipe is lined with a band-shaped body wound spirally, the inner peripheral surface of the existing pipe is wound spirally so that the side edges thereof face each other. With each side edge of the band-shaped body slidably locked to each other,
A flat strip interposed between mutually opposing side edges so that the spiral strip is maintained at a predetermined diameter, the mutually opposing sides of the spirally wound strip being interposed between mutually opposing side edges. A belt having a thickness that can be pressed against each side edge of the belt, having a relatively high hardness lower than the hardness of the belt, and having a high coefficient of static friction with respect to the belt. Material.