JP2534413B2 - Strip for existing pipe lining method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strip-shaped body forming a spiral pipe, which is used in a lining construction method for an existing pipe, in which a deteriorated existing pipe is repaired by a spiral pipe.

[0002]

2. Description of the Related Art Metal pipes and fume pipes have been used for a long time as existing pipes used for water supply and sewerage.
Such existing pipes may deteriorate due to long-term use, and may leak due to cracking or corrosion. For this reason, recently, the existing pipes are rehabilitated by inserting synthetic resin pipes into the existing pipes such as aged buried pipes and lining them.

One of the methods for lining an existing pipe is to insert a spiral pipe formed by spirally winding a synthetic resin band into the existing pipe, and to attach the spiral pipe to the inner peripheral surface of the existing pipe. A method for lining is disclosed in, for example, Japanese Patent Laid-Open No. 2-245317. In this construction method, for example, a band-shaped body having a cross section shown in FIG. 6 is used. The strip-shaped body 100 is provided with a strip 101 on one side edge of a strip-shaped substrate 120 along the longitudinal direction, and a projecting strip fitted into the recess 101 on the other side edge. 102 is provided. The groove 101 and the ridge 1 of the substrate 120
A large number of reinforcing ribs 190, 190, ... Are provided between the two.

Such a strip 100 is spirally wound in an existing pipe, and as shown in FIG. 7, a ridge 102 is sequentially inserted into a concave ridge 101 at one side edge to prevent the strip from coming off. To be done. At this time, the side edge of the substrate 120 close to the protrusion 102 and the substrate 120
A fixing band member 103 is sequentially interposed between the opposite side surface of the other side edge portion and the opposite side surface so that the spiral tube formed by pressing the opposite side surfaces to each other has a predetermined outer diameter. It In this manner, as shown in FIG. 8B, spiral pipes having a diameter sufficiently smaller than that of the existing pipe 111 are sequentially manufactured and propelled into the existing pipe 111. Then, after inserting the small-diameter spiral pipe into the existing pipe 111, the tip of the spiral pipe is fixed to the end of the existing pipe 111 by an anchor or the like. In such a state, a propulsive force is applied to the strip-shaped body forming the spiral tube while the fixing band member is sequentially released from the tip end side of the spiral tube fixed to the existing tube 111. As a result, the protrusion 10 inserted into the recess 101 of the strip 100 from the portion where the fixing strip 103 of the spiral tube is removed.
2 is slid, the diameter of the spiral pipe 110 is expanded, and the spiral pipe 110 is in close contact with the inner peripheral surface of the existing pipe 111, as shown in FIG.
By expanding the diameter of the entire spiral pipe located in the existing pipe 111 in this manner, the existing pipe 111 is lined with the spiral pipe over the entire length.

The strip 100 is usually integrally manufactured from a flexible synthetic resin such as polyvinyl chloride.

[0006]

As described above, in the lining method in which the spiral pipe having a small diameter is inserted into the existing pipe and the diameter of the spiral pipe is closely contacted with the inner peripheral surface of the existing pipe, the diameter is increased. The phenomenon that the spiral tube contracts in the axial direction occurs. The cause of this contraction phenomenon is considered as follows. In a small-diameter spiral tube in which the fixing band member 103 is interposed between the side edge portions of the substrate 120, the groove 101 of the band-shaped body 100 is in a state of slightly extending in the axial direction of the spiral tube. When the fixing strip 103 is detached from the spiral tube from the state, as shown in FIG. 7, the extension of the recess 101 is released, and the contraction force for generating the contraction amount δ in the axial direction of the spiral tube is generated. Occurs. Since such a contracting force is accumulated over the entire axial direction of the spiral tube, a large contracting force is generated in the spiral tube as a whole.
Further, as shown in FIG. 8B, the spiral angle of the strip 100 in the spiral tube 110 is the helical angle.
Before the diameter of 10 is expanded, it becomes as small as θ2, but as the diameter of the spiral tube 110 is expanded, it increases to θ1 as shown in FIG. 8A. At this time, FIG. 8 (c)
As shown in (4), the axial length of the strip 100 in the spiral tube 110 decreases from x ₁ to x ₂ for each winding of the strip 100 by increasing the spiral angle from θ 2 to θ _1. The spiral tube 110 as a whole accumulates the reduced amount Δx, resulting in a large contraction amount.

Therefore, the contraction amount ΔL of the entire spiral tube 110 in the axial direction is the contraction amount δ generated when the fixing strip 103 is detached, and the contraction amount ΔL2 generated by the change of the spiral winding angle.
Is added (ΔL = δ + ΔL2).

Here, the pipe length of the spiral pipe is L, and the strip 100 is
Is W, the height of the strip 100 (the thickness of the substrate 120 and the height of the auxiliary rib 190) is H, the outer diameter before the diameter expansion is d, and the outer diameter after the diameter expansion is D, ΔL = [{δ · L (D−H) / (d−H)} / x ₁ ] + {L (x ₁ −x ₂ ) / x ₂ } = L [δ {(D−H) / (d−H) )} / X ₁ + (x ₁ / x ₂ ) −1] = L [δ · (D−H) / (d−H) · {(π ² (d−H) ² −W ² ) ^1/2 / Π · (d−H) W} + (d−H) / (D−H)} · {(π ² (D−H) ² −W ² ) ^1/2 / (π ² (d−H) ²⁻ W ² ) ^1/2 } −1] where α = δ · (D−H) / (d−H) · {(π ² (d−H) ² −W ² ) ^1/2 / π・ (D−H) W} + (d−H) / (D−H)} · {(π ² (D−H) ² −W ² ) ^1/2 / (π ² (d−H) ² − Assuming that W ² ) ^1/2 } −1, ΔL = L · α This α is as shown in Table 1 when the width W of the strip 100 is constant (77 mm). The larger the, the larger.

[0009]

[Table 1]

Table 2 shows the relationship between the width W of the strip 100 and α. If the width W of the strip 100 is within the predetermined range, α will not increase.

[0011]

[Table 2]

FIG. 9 shows the relationship between the contraction amount ΔL of the spiral tube and the pulling force F acting on the fitting portion between the groove 101 and the protrusion 102 in the strip 100. The contraction amount ΔL depends on the outer diameter and the entire length of the expanded spiral tube, but the contraction amount ΔL
As the pulling force F acting on the fitting portion also increases with increasing, the contraction amount ΔL increases, the strip-shaped body 100
The projection 102 and the concave strip 101 of the
There is a risk that 0 will decompose. Further, when the shrinkage amount ΔL becomes large, the pipe manufacturing machine for manufacturing the spiral pipe 110 may be damaged by being pulled by the spiral pipe 110 and colliding with the existing pipe. There is also a problem that when the pipe making machine is pulled, workers around the pipe making machine are in danger.

The present invention solves such a problem, and an object thereof is a strip for the existing pipe lining method capable of preventing the spiral pipe lined on the inner surface of the existing pipe from contracting in the axial direction. To provide.

[0014]

The strip for use in the existing pipe lining method of the present invention is constructed by inserting a spiral pipe in a small diameter state into the existing pipe and successively expanding the diameter from one end of the spiral pipe. A strip-shaped body used for an existing pipe lining construction method for lining an inner peripheral surface of an existing pipe with the spiral pipe, the strip-shaped substrate and along each side edge of the substrate. Fitting recesses and fitting ridges, which are respectively arranged and are fitted to each other when spirally wound, and a part of the board, so that the board can extend in the width direction of the board. And an extension portion provided at the end, thereby achieving the above object.

[0015]

In the existing pipe lining strip of the present invention, when the spiral pipe is manufactured, the fitting concave lines and the fitting projection lines provided on the respective side edge portions of the substrate are fitted to each other so as to slide relative to each other. By not setting it, a spiral tube having a small diameter is obtained. Then, the small-diameter spiral tube inserted into the existing pipe is gradually expanded from one end by sliding the fitting concave line and the fitting projecting line, and the expanded spiral pipe is installed. Line the inner surface of the pipe. The contracting force generated in the spiral tube when the diameter is increased is absorbed by the expansion portion of the strip provided on the substrate extending in the width direction, and the spiral tube is not likely to contract in the axial direction.

[0016]

EXAMPLES Examples of the present invention will be described below. As shown in FIG. 1, a strip-shaped body for an existing pipe lining method of the present invention has a strip-shaped substrate 12 made of synthetic resin. One side surface 12a extending in the longitudinal direction of the substrate 12
Fitting ridges 13 are erected integrally with the substrate 12 at the side edges near the. The side surface 12a near the fitting protrusion 13 is an inclined surface. The fitting ridge 13 is formed on the surface of the substrate 12 with a column portion 13a which is slightly larger than the thickness of the substrate 12 and with a semicircular cross section formed continuously with the tip of the column portion 13a. And a portion 13b. The upper surface of this insertion portion 13b has an arc shape, and both side portions at the lower portion thereof are the pillar portions 13a.
It is a locking portion 13c protruding laterally from.

A step drop portion 14 is formed on the other side edge portion of the substrate 12. The stepped-down portion 14 has a thickness corresponding to the thickness of the board 12 so that the side edge portion on the side where the fitting projection 13 is disposed can fit when the board 12 is spirally wound. It has a stepped shape on the protruding side of 13. And, in the step drop portion 14,
A fitting recess 15 having a semicircular cross section having a space having a semicircular cross section into which the insertion portion 13b of the fitting projection 13 can fit is formed along the longitudinal direction of the substrate 12 with the fitting projection 13. It is provided so as to project in the direction. A pair of engaging projections 15a and 15a capable of being locked by the respective locking portions 13c of the insertion portion 13b of the fitting protrusion 13 are formed on the inner peripheral surface of the base end portion of the fitting concave portion 15 in a semicircular shape. It is formed so as to project into the space. The insertion portion 13b of the fitting projection 13 is smoothly inserted into the fitting recess 15 from its arcuate peripheral surface, and the fitting projection 13 is locked to the engagement projection 15a of the fitting recess 15. By engaging the portion 13c, the fitting protrusion 13
The insertion portion 13b of this is prevented from coming off from the internal space of the fitting groove 15. The insertion portion 13b of the fitting projection 13 inserted into the fitting recess 15 of the step-down portion 14 is in a state where it can slide in the fitting recess 15. When the insertion portion 13b of the fitting protrusion 13 is inserted into the fitting recessed portion 15, one side surface 12a of the substrate 12 fitted in the stepped-down portion 14 is located between the facing surface of the stepped-down portion 14. A small gap is formed in

Fitting ridges 13 and fitting ridges on the board 12
A plurality of reinforcing ribs 19 ... Having a T-shaped cross section are formed integrally with the substrate 12 at a uniform interval in the width direction of the substrate 12. Each reinforcing rib 19 has a pillar portion 19a provided upright on the base plate 12, and a flange portion 19b extending in parallel with the base plate 12 at the tip of the pillar portion 19a.
Is set to be slightly larger than the thickness of the substrate 12. As shown in FIG. 4, the reinforcing rib 19 adjacent to the fitting protrusion 13 has the fitting recess 15 when the insertion portion 13b of the fitting protrusion 13 is inserted into the fitting recess 15. The tip of the stepped-down portion 14 continuous with the abutment portion abuts on the column portion 19a of the reinforcing rib 19.

In the portion of the substrate 12 between the first reinforcing rib 19 and the second reinforcing rib 19 on the side of the fitting groove 15 of the substrate 12, the entire substrate 12 can be extended in the width direction. An extension portion 17 made of an elastic material is provided along the longitudinal direction of the substrate 12. Strip-shaped body 10, except for the extension 17, polyvinyl chloride, polyethylene, polypropylene,
It is integrally formed of polycarbonate, polyester, or a resin material obtained by reinforcing these resins with glass fiber. The extension portion 17 is made of a thermoplastic elastomer such as hard rubber that is hard and is not easily deformed by twisting. Then, the synthetic resin portion such as the substrate 12 excluding the extending portion 17 and the extending portion are integrally extrusion-molded, so that the belt-shaped body 10 is manufactured. Extension 17
As the thermoplastic elastomer, for example, “Denka LCS” (trade name) manufactured by Denki Kagaku Kogyo Co., Ltd. is preferably used.

As shown in FIG. 2, the lining method for an existing pipe using the strip-shaped body having the above structure is
With the pipe making machine 20 installed in the manhole 82,
The front surface side of the substrate 12 from which the 13, the fitting recessed line 15 and the reinforcing rib 19 project is the outer peripheral side, and the spiral tube 10 'is manufactured. The pipe making machine 20 has a pipe making roller 21 in which the strip 10 introduced into the pipe making machine 20 is arranged on a cylindrical peripheral surface with a predetermined spiral angle.
Is forcibly curved by, and the band-shaped body 10 is spirally wound. Then, as shown in FIG. 4, in the space of the fitting recess 15 of the spirally wound strip 10, the fitting projection 13 of the strip 10 newly introduced into the pipe making machine 20 is introduced. The insertion portion 13b of is inserted. When the insertion portion 13b of the fitting protrusion 13 is inserted into the space of the fitting recessed portion 15, each locking portion 13c of the insertion portion 13b is inserted.
However, they are prevented from coming off by being locked to the respective engaging projections 15a of the fitting recessed line 15, and the side edge portions of the strip-shaped bodies 10 adjacent to each other are locked.

At this time, as shown in FIG.
The fixing strip 30 is interposed between the facing surfaces of the stepped-down portion 14 provided with and the side edge portion of the substrate 12 fitted in the stepped-down portion 14 adjacent to the fitting protrusion 13. To be done. The fixing band 30
The friction force between the locked side edge portions of the band-shaped body 10 is increased to prevent the fitting concave line 15 and the fitting protrusion line 13 from sliding relative to each other. As a result, the spiral pipe 10 'produced by the pipe making machine 20 is maintained at a diameter sufficiently smaller than the inner diameter of the sewer pipe 81 without expanding the diameter.

The spiral tube 10 'thus manufactured is
It is inserted into the sewer pipe 81 while being rotated by the pipe making machine 20. Then, the spiral pipe 10 ′ having a small diameter is sequentially manufactured, so that the spiral pipe 10 ′ manufactured inside the sewer pipe 81 is propelled. 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' has the inside of the sewer pipe 81 in a state where only the bottom portion thereof contacts the inner surface of the sewer pipe 81. Promote smoothly. Eventually, when the forward end of the spiral pipe 10 ′ reaches the end of the sewer pipe 81, the pipe making operation of the pipe making machine 20 is temporarily stopped, and the end of the spiral pipe 10 ′ becomes the end of the sewer pipe 81. It is fixed by an anchor or the like.

When the pipe making machine 20 is driven again with the tip of the spiral pipe 10 'fixed to the end of the sewer pipe 81, the pipe making machine is
The strip 10 is supplied to 20 and the spiral pipe 10 ′ tries to propel in the sewer pipe 81 while rotating again. At this time, the pipe making machine
Simultaneously with the driving of 20, as shown in FIG. 3, the fixing strip 30 interposed between the step-down portion 14 and the substrate 12 fitted to the step-down portion 14 is, for example, a spiral tube 10 '. A strip removing tool (40) provided inside the spiral tube (10 ') sequentially releases the spiral tube (10') from the fixed side end. By detaching the fixing strip 30 from the spiral tube 10 ', the strong pressure-bonded state between the step-down portion 14 and the edge portion of the substrate 12 side fitted to the step-down portion 14 is released, and the fitting is completed. The insertion portion 13b of the fitting projection 13 inserted into the recess 15 is in a state where it can smoothly slide in the fitting recess 15.

At this time, when the fixing band member 30 is detached, the step-down portion 14 and the fitting concave line 15 in the state of being deformed by the fixing band member 30 are mutually caused by their own elastic force. Restore so that it adheres to the. Due to the restoring action of the stepped-down portion 14 and the fitting concave portion 15, a force for contracting in the width direction of the band-shaped body 10 acts on the fitting portion of the fitting protruding portion 13 and the fitting concave portion 15. This contraction force is generated for each fitting portion of the fitting protrusion 13 and the fitting recess 15 over the entire length of the spiral tube 10 ', and serves as a force to contract the entire spiral tube 10' in the axial direction.

In this state, the pipe manufacturing machine 20 is driven,
When the strip-shaped body 10 is sequentially fed into the spiral pipe 10 ′ made into a pipe, the tip end of the spiral pipe 10 ′ is sewage pipe 8 as shown in FIG.
Since the spiral tube 10 'is fixed to 1, the fitting concave line 15 and the fitting projection line 13 of the spiral tube 10' slide on each other, and the diameter of the spiral tube 10 'is sequentially increased from the fixed tip side. And the spiral pipe 10 'is the sewer pipe 8
The spiral pipe 10 ′ is in close contact with the inner peripheral surface of the sewer pipe 81 by being expanded in the diameter of the pipe 1. In this way, when the diameter of the spiral tube 10 ′ is expanded, the spiral angle of the spirally wound strip 10 is increased, and the axial length of the spiral tube 10 ′ is reduced. A contracting force acts on the spiral tube 10 '.

However, since the substrate 12 of the strip 10 is provided with the extending portion 17, the contracting force generated when the fixing strip 30 is detached from the spiral tube 10 'and the spiral tube 10'.
When the contracting force generated when the diameter of the spiral tube is expanded acts, the expansion portion 17 is expanded and the axial length of the spiral tube 10 'is prevented from contracting. In the present embodiment, since the extension portion 17 provided in the substrate 12 is made of a hard thermoplastic elastomer, the extension portion 17 portion of the substrate 12 is resistant to twisting and deforms even when spirally wound. There is no fear.

The widthwise dimension of the extending portion 17 is defined by the contracting force generated when the strip 10 is lined on the inner surface of the sewer pipe 81.
It is set to ensure absorption.

As a result, the spiral tube 10 'absorbs the axial contracting force acting when the spiral tube 10' expands in diameter due to the expansion of the extending portion 17 of the strip 10 and the spiral tube 10 'is absorbed. 'Is
The diameter of the entire sewer pipe 81 is expanded without contracting in the axial direction. The diameter of the spiral pipe 10 'that has been expanded is brought into close contact with the entire inner peripheral surface of the sewer pipe 81, and the spiral pipe 10' lines the sewer pipe 81.

The present invention is not limited to the above embodiment, and can be modified within the scope of the present invention. For example,
As shown in FIG. 5, the extending portion 18 formed on the substrate 12 of the strip 10 may be a curved thin-walled curved portion 18a made of the same material as the substrate 12. The lower side of the curved portion 18a is covered with a thin cover body 18b extending from the lower surface of the substrate 12. Such a band-shaped body 10 also has the band-shaped body shown in FIG.
Similar to 10, the axial contracting force generated when expanding the diameter of the spiral tube 10 ′ can be absorbed by the bending portion 18 a of the extending portion 18 extending.

[0030]

As described above, the strip for the existing pipe lining method of the present invention, after being made into a spiral pipe and inserted into the existing pipe, has a contracting force generated when the diameter is expanded in the existing pipe, The axial length of the spiral tube is prevented from contracting because it can be absorbed by the extension of the extension portion provided on the substrate.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an example of an existing pipe lining strip according to the present invention.

FIG. 2 is a cross-sectional view of a sewer pipe showing one step of an existing pipe lining method using the strip according to the present invention.

FIG. 3 is a cross-sectional view of a sewer pipe showing another step of an existing pipe lining method using the strip according to the present invention.

FIG. 4 is a cross-sectional view showing a state in which a fitting groove and a fitting protrusion of a spiral tube formed of a strip are fitted together.

FIG. 5 is a cross-sectional view showing another embodiment of the band-shaped body.

FIG. 6 is a cross-sectional view showing a conventional strip.

FIG. 7 is a cross-sectional view of a main part when a spiral tube is formed of the strip.

FIG. 8A is a cross-sectional view showing a state in which the diameter of the spiral pipe is expanded in the sewer pipe. (B) is sectional drawing which shows the spiral pipe inserted in the sewer pipe. (C) is a schematic diagram for explaining the contracting force in the axial direction generated when the diameter of the spiral tube is expanded.

FIG. 9 is a graph showing the relationship between the axial shrinkage force of a spiral tube and the shrinkage amount.

[Explanation of symbols]

 10 Strip 10 'Spiral tube 12 Substrate 13 Fitting ridge 15 Fitting ridge 17, 18 Extension 18a Curved part 19 Reinforcing rib 20 Pipe making machine 30 Fixing strip 81 Sewer pipe

Claims (1)

(57) [Claims] 1. An existing pipe lining construction method in which a spiral pipe is inserted into an existing pipe in a small diameter state and the diameter of the spiral pipe is sequentially expanded from one end of the spiral pipe to line the inner peripheral surface of the existing pipe. A strip-shaped body used for forming the spiral tube, the strip-shaped substrate and the strip-shaped substrate being arranged along each side edge of the substrate, respectively, when they are spirally wound. An existing pipe lining strip having a fitting concave line and a fitting protrusion line that are fitted to the base plate, and an extending portion that is provided in a part of the base plate so as to extend in the width direction of the base plate. body.