JPH10166444A - Reinforcing material for helical tube, helical tube using the same, and method for lining existing tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restore the strength of an existing tube when the existing tube is recovered using a helical tube manufactured from a belt-shaped material. SOLUTION: When a helical tube is manufactured by helically winding a belt-shaped body 10 formed from flexible synthetic resin, a reinforcing material 20 is engaged with a reinforcing rib 17 of the body 10. The material 20 is bent into a belt shape having a W-shaped cross section and a reinforcing bar is attached integrally to the center of the material 20 in the width direction thereof. A helical tube made of the belt-shaped body 10 to which the material 20 is fixed is inserted into an existing tube and back filling material is filled between the existing tube and the helical tube, whereby the reinforcing bar of the material 20 is made integral with the back filling material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing member attached to a strip used for manufacturing a spiral tube used for rehabilitating an aging existing pipe, and a spiral using the reinforcing member. Pipe lining method for existing pipes

[0002]

2. Description of the Related Art When an existing pipe such as a sewer pipe is deteriorated, a method of lining the existing pipe using a band-shaped strip made of a synthetic resin having flexibility is disclosed in Japanese Patent Laid-Open Publication No. Hei.
Japanese Patent Publication No. 245317, Japanese Patent Publication No. 3-48392, Japanese Patent Publication No. 3-10493, and the like. In these lining methods, a spiral strip is spirally wound to form a spiral pipe by joining adjacent side edges to each other, and the formed spiral pipe is inserted into an existing pipe. By filling the backfill material between the existing pipe and the spiral pipe, the inner peripheral surface of the existing pipe is lined.

Further, Japanese Patent Publication No. 64-500502 discloses that a thin strip is attached to reinforcing ribs provided on a strip when a flexible strip is spirally wound to manufacture a spiral tube. There is disclosed a configuration in which a spiral tube is formed by continuously engaging a reinforcing member made of a metal plate in a spiral shape and spirally winding a belt-like body together with the reinforcing member. In this way, by forming the helical tube in a state where the belt-like body is reinforced by the reinforcing material, the helical tube to be manufactured has a high strength, and is backfilled between the helical tube inserted into the existing tube and the existing tube. Even when the material is filled, the helical tube is prevented from buckling and breaking.

[0004]

If a reinforced concrete pipe such as a fume pipe is used as an existing pipe, the concrete may be corroded due to aging, and the reinforcing steel buried in the concrete may be exposed and corroded. As described above, when the reinforcing steel buried in the concrete is also corroded, the strength of the reinforced concrete pipe is significantly reduced. For this reason, when rehabilitating an existing pipe with a spiral pipe, it is necessary to prevent water leakage of the existing pipe and to improve the strength of the existing pipe itself.

However, the above-mentioned Japanese Patent Application Laid-Open No.
As disclosed in Japanese Patent Publication No. 0502, even when a spiral tube is manufactured in a state in which the strip is reinforced by a reinforcing member formed of a strip-shaped metal plate, the manufactured spiral tube is formed by a backfill material. Although the bending rigidity against buckling increases, the tensile strength cannot be increased. As a result, in a spiral pipe reinforced by a reinforcing material, the strength of a reinforced concrete pipe in which a reinforcing bar is corroded cannot be restored.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide a method for rehabilitating an aging existing pipe by using a spiral pipe manufactured by spirally winding a strip. It is an object of the present invention to provide a helical pipe reinforcing material capable of simultaneously restoring the strength of a pipe, and a lining method for a helical pipe and an existing pipe using the same.

[0007]

The spiral pipe reinforcing material of the present invention is a spiral pipe lining the inner peripheral surface of an existing pipe, so that it is spirally wound and adjacent side edges are mutually connected. A reinforcing member attached to a flexible band to be joined to the pipe, wherein the band wound spirally along the inner peripheral surface of the existing pipe when the band is spirally wound. A belt-shaped reinforcing main body portion that is locked along the longitudinal direction with respect to the band-shaped body so as to be plastically deformed so as to maintain a state, and a reinforcing bar integrally attached to the reinforcing main body portion. Features.

In a helical tube using the helical tube reinforcing material of the present invention, the helical tube is spirally wound together with the helical tube reinforcing material in a state where the reinforced material for a helical tube is engaged with the helical tube. It is characterized by being formed by being wound and joining adjacent side edges.

Further, in the method for lining an existing pipe using the reinforcing material for a spiral pipe according to the present invention, the belt-like body to which the reinforcing material for a spiral pipe is attached is spirally wound to join adjacent side edges to each other. A spiral pipe is formed by lining the inner peripheral surface of the existing pipe with the formed spiral pipe, and then a backfill material is filled between the spiral pipe and the existing pipe.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a cross-sectional view showing an example of an existing pipe lining strip to which a spiral pipe reinforcing material of the present invention is attached. The belt-shaped body 10 is made of a flexible synthetic resin, and is entirely reinforced by a belt-shaped reinforcing member 20. The reinforcing member 20 is formed so that the reinforcing member 20 is plastically deformed and maintains the curved state when the band 10 is in a predetermined curved state.
0 along the longitudinal direction.

The belt-like body 10 is made of a substrate 1 formed of a flexible synthetic resin into a belt having a thickness of about 2 to 4 mm.
One. On one side edge of the substrate 11 in the width direction, a step-down portion 1 located outside by the thickness of the substrate 11 is provided.
2 are provided. On the side edge of the stepped portion 12, an oblique locking rib 14 that extends obliquely to the surface side of the substrate 11 is provided continuously in the longitudinal direction.

In the middle of the step-down portion 12, the oblique locking rib 1
Semi-annular socket 1 projecting in the same direction as the projecting direction of 4
3 are provided continuously along the longitudinal direction of the substrate 11. The socket 13 is open on the back surface of the substrate 11. The inside of the socket 13 is in a state where the opening side is narrow and the inner side is expanded in an arc shape.
On the outer peripheral surface of the semi-annular socket 13, a reinforcing portion 16 extending linearly in a tangential direction of the socket 13 is provided.

The substrate 11 is spirally wound so that the surface on which the socket 13 and the oblique locking ribs 14 are provided is on the outer peripheral side.

A portion near the side edge of the substrate 11 opposite to the side edge on which the oblique locking rib 14 is provided includes:
A fitting ridge 15 that stands vertically with respect to the substrate 11 in the same direction as the direction in which the socket 13 protrudes is provided continuously along the longitudinal direction of the substrate 11. This fitting ridge 15
Is provided with a fitting portion having a circular cross section at the tip of a pillar portion rising vertically from the surface of the substrate 11, and the fitting portion has a hollow cross section of a socket 13 provided in the step-down portion 12. It has a matching circular cross section.

A fitting ridge 1 is provided on the outer peripheral surface of the substrate 11.
5 and the socket 13 of the step-down portion 12,
A pair of reinforcing ribs 17 having a T-shaped cross section projecting in the same direction as 5.
Is provided. The reinforcing ribs 17 arranged adjacent to the fitting ridges 15 are in such a state that the distal end portions protrude largely toward the fitting ridges 15. When the substrate 11 is spirally wound and the fitting ridge 15 is fitted in the socket 13 as shown by a two-dot chain line in FIG. The tip of the rib 14 is locked.

The strip 10 having such a structure is provided on the substrate 1.
1, step-down portion 12, socket 13, oblique locking rib 14,
The fitting ridges 15 and the reinforcing ribs 17 are integrally formed of a flexible synthetic resin such as polyethylene, polypropylene, and vinyl chloride.

Between the pair of reinforcing ribs 17 provided at the center of the substrate 11 in the width direction, a reinforcing member 20 extending in a band along the longitudinal direction of the substrate 11 is provided. FIG.
2A is a cross-sectional view of the reinforcing member 20, and FIG. 2B is a perspective view thereof. The reinforcing member 20 has a thickness of 1.0 to 1.5.
A metal plate formed into a strip shape by a steel plate, a stainless steel plate, an aluminum plate or the like having a thickness of about mm is formed into a reinforcing main body 21 formed into a W-shaped cross section, and an acute angle at the center in the width direction of the reinforcing main body 21. And a reinforcing bar 22 integrally attached to a bent portion protruding upward. The reinforcing body 21 is bent so that the center in the width direction projects upward at an acute angle, and each side edge is positioned on each side with respect to the center in the width direction. An intermediate portion between the center portion and each side edge is bent so as to protrude downward at an acute angle, thereby forming a W-shaped cross section.

The material of the reinforcing body portion 21 of the reinforcing member 20 is not particularly limited as long as it has a higher elastic modulus than the flexible belt-shaped body 10, but a metal such as iron or aluminum is processed. It is easy and suitable. When corrosion resistance is required, stainless steel or the like is more preferable.

The reinforcing bar 22 is made of, for example, a steel bar for reinforced concrete having a nominal diameter D6, and is integrated with the reinforcing main body 21 by welding or by a metal adhesive. The reinforcing bar 22 is also not particularly limited, and may be made of the same material as the reinforcing body.
Different materials may be used.

The reinforcing bar 22 and the reinforcing body 21 do not need to be continuously integrated in the longitudinal direction, but are detached from the reinforcing body 21 when wound spirally together with the strip 10. If it does not hinder the pipe work, it is sufficient that they are integrated by welding or metal adhesive at an appropriate interval.

Each side edge of the reinforcing body 21 of the reinforcing member 20 is formed by a pair of reinforcing ribs 1 provided at the center of the substrate 11.
The reinforcing member 20 is held on the substrate 11 by being locked to the distal end of the base 7.

As shown in FIG. 3, when the belt-shaped body 10 is carried into the sewage pipe 30, the reinforcing member 20 in which the reinforcing bar 22 is integrally attached to the reinforcing body 21 having a W-shaped cross section is provided. Is spirally wound into a spiral pipe while being locked between the pair of reinforcing ribs 17, so that the inner peripheral surface of the sewer pipe 30 is lined. In this case, the band-shaped body 10 spirally wound has the fitting ridge 15 fitted into the socket 13 provided in the step-down portion 12,
The tip of the oblique locking rib 14 is engaged between the reinforcing ribs 17. The fitting ridge 15 fitted in the socket 13 is
It is locked to the socket 13 to be in a retaining state. Thereby, the strip 10 is formed into a spiral tube together with the reinforcing member 20.

In the sewage pipe 30, the belt 10 and the reinforcing material 2
0, when the spiral pipe is formed, the sewer pipe 3
The backfill material 40 is filled between 0 and the spiral tube. In this case, the reinforcing bar 22 of the reinforcing member 20 integrally engaged with the belt-shaped body 10 is buried inside the backing material 40,
The backfill material 40 integrated with the sewer pipe 30 is
Is reinforced by the reinforcing bar 22.

The reinforcing bar 22 of the reinforcing member 20 is firmly integrated with the backing material 40 so that the strength of the sewer pipe 30 can be improved. It is preferably provided at a position where the contact area with 40 is large, and is preferably provided on the backfill material side when the strip 10 is spirally wound.

As shown in FIG. 2, the reinforcing body 20 does not need to have a W-shaped cross section, and the position of the reinforcing bar 22 to the reinforcing body 21 is not particularly limited. It is not something to be done. For example, FIG.
As shown in (a) and (b), using a reinforcing body 21 having a cross-sectional shape protruding upward in a state where the center in the width direction is curved in an arc shape, the center of the reinforcing body 21 in the width direction is used. A structure in which the reinforcing bar 22 is integrally attached to an arcuately curved portion of the portion, or a reinforcing body portion 2 having a U-shaped cross section opened upward as shown in FIGS. 5 (a) and 5 (b).
1, the reinforcing bar 22 may be integrally attached to the center of the reinforcing body 21 in the width direction.

Next, an experimental example of the present invention will be described.

<Experimental Example 1> As shown in FIG. 1, the reinforcing members 20 shown in FIG. 2 are respectively engaged with the strips 10 to manufacture a spiral tube. Fume pipe (reinforced concrete pipe) 51 shown in FIGS.
Was lined, a backfill material was filled between the fume tube 51 and the spiral tube, and the strength of the fume tube 51 was measured. The diameter of the fume pipe was 2000 mm, and a new one that was not used at all as a sewer pipe or the like was used. Then, in order to realize reproducibility due to corrosion, the inner peripheral surface of the fume tube 51 was cut so that the reinforcing bar was exposed, and a further reinforcing bar on the inner peripheral surface side was removed.

The diameter of the spiral tube inserted into the fume tube 51 was 1800 mm. Further, the injection pressure of the backfill material filled between the fume tube 51 and the spiral tube was set to 0.5 kgf / cm ² . After the backfill material was filled, it was cured at room temperature for one week.

As described above, the fume tube 51 lined with the spiral tube is manufactured, and its strength is measured by the method shown in FIG.
The measurement was performed as shown in (a) and (b). That is, the fume tube 51 is placed on the rubber plate 52, and the rubber plate 53 is laid on a portion other than the receptacle of the fume tube 51, and the square bar 54 is placed over the entire length of the rubber plate 53. The section steel 55 was placed over the entire length of the square bar 54, and a load P was applied to a half of the fume tube 51. Then, the load P when the fume tube 51 was broken was measured as an external pressure strength (kgf / m 2).

Further, using the reinforcing material 20 shown in FIG.
Similar experiments were performed.

The external pressure strength of the fume pipe 51 when the reinforcing material 20 shown in FIG. 2 is used is 21900 kgf / m, and the external pressure strength of the fume pipe 51 when the reinforcing material 20 shown in FIG. , 22600 kgf / m 2.

For the sake of comparison, the reinforcing member of the fume tube 51 is not deleted, and the reinforcing member 20 shown in FIG. Then, the spiral tube was manufactured by being locked to the belt-shaped body 10, the inner peripheral surface of the fume tube 51 was lined, and the external pressure strength of the fume tube 51 was measured.
It was 0 kgf / m.

Further, for comparison, when the reinforcing bar of the fume tube 51 was not deleted and the lining by the spiral tube was not performed, that is, when the external pressure strength of the fume tube 51 itself was measured, it was 13200 kgf / m. Was. Further, the external pressure strength of the fume tube 51 in a state where the rebar of the fume tube 51 was removed was 6,400 kgf / m 2. Table 1 shows the results. <Experimental Example 2> A helical tube is manufactured by engaging the reinforcing member 20 shown in FIG. 2 with the belt-shaped body 10 shown in FIG. 1, and the manufactured helical tube is used as shown in FIGS. 7 (a) and 7 (b). The inner peripheral surface of the box culvert 61 having a square cross section shown and reinforced by a reinforcing bar was lined, a backfill material was filled between the box culvert 61 and the spiral tube, and the strength of the box culvert 61 was measured. A new box culvert 61 having a side length of 1200 mm and not being used as a sewer pipe or the like was used. Then, in order to realize reproducibility due to corrosion, the inner peripheral surface of the box culvert 61 was cut so that the reinforcing bar was exposed, and a further reinforcing bar on the inner peripheral surface side was removed.

The cross section of the spiral tube inserted into the box culvert 61 was a square having a side of 1100 mm. The injection pressure of the backfill material filled between the box culvert 61 and the spiral tube was set to 0.5 kgf / cm ² . The backfill material was cured at room temperature for one week after filling between the box culvert 61 and the spiral tube.

In this way, a box culvert 61 lined with a spiral tube was manufactured, and its strength was measured as shown in FIGS. 7 (a) and 7 (b). That is, the box culvert 61 is connected to the pair of shaped steel members 6.
2 and a rubber plate 65, respectively, and at the center of the upper surface of the box culvert 61,
A rubber plate 63 having a thickness of 10 mm and a width of 200 mm is laid over the entire length of the box culvert 61, and the shaped steel 64 is placed on the rubber plate 63.
, And a load P was applied to a position １ ／ of the entire length of the box culvert 61 on the shape steel 64. Then, the load P when the box culvert 61 was broken was measured as an external pressure strength (kgf / m 2).

Further, using the reinforcing member 20 shown in FIG.
Similar experiments were performed.

The external pressure strength of the box culvert 61 when the reinforcing material 20 shown in FIG. 2 is used is 9600 kgf / m, and the external pressure strength of the box culvert 61 when the reinforcing material 20 shown in FIG. , And 10100 kgf / m 2.

For the sake of comparison, the reinforcing bar of the box culvert 61 was not removed and the reinforcing member 20 shown in FIG.
In the above, the reinforcing material constituted only by the reinforcing main body 21 without the reinforcing bar 22 is locked to the belt-shaped body 10 to manufacture a spiral tube, and the inner peripheral surface of the box culvert 61 is lined. When the external pressure strength of the box culvert 61 was measured, it was 7900 kgf / m 2.

Further, for comparison, the case where the reinforcing bar of the box culvert 61 was not deleted and the lining by the spiral tube was not performed, that is, the box culvert 6
When the external pressure strength of 1 itself was measured, it was 8200 kgf / m. The external pressure strength of the box culvert 61 in a state where the reinforcing bar of the box culvert 61 is removed is 2400 kg.
f / m. The results are also shown in Table 1.

[0041]

[Table 1]

[0042]

As described above, the reinforcing material for a spiral tube according to the present invention has a structure in which the reinforcing main body portion locked to the flexible belt-like body has:
Because the rebar is integrally attached and configured,
When the existing pipe is rehabilitated by the spiral pipe manufactured by the belt-like body in which the reinforcing material is locked, the strength of the existing pipe can be restored at the same time by the reinforcing bar of the reinforcing material. Therefore, the existing pipe can be lined with high strength by the spiral pipe using the spiral band.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a state in which a reinforcing material for a spiral tube according to the present invention is engaged with a belt-shaped body which is a spiral tube.

FIG. 2 (a) is a cross-sectional view showing an example of an embodiment of a spiral pipe reinforcing material of the present invention provided on the strip,
(B) is a perspective view thereof.

FIG. 3 is a sectional view of a main part showing a state in which a sewer pipe is lined with a spiral pipe manufactured by a belt-like body to which the reinforcing material for the spiral pipe is locked.

FIG. 4 (a) is a cross-sectional view showing another example of the embodiment of the spiral pipe reinforcing material of the present invention provided on the belt-like body,
(B) is a perspective view thereof.

FIG. 5 (a) is a cross-sectional view showing still another example of the embodiment of the spiral tube reinforcing material of the present invention provided on the strip, and FIG. 5 (b) is a perspective view thereof.

FIG. 6A is a longitudinal sectional view schematically illustrating an experiment for measuring the strength of a fume tube when the fume tube is rehabilitated using the spiral tube reinforcing material of the present invention, and FIG. It is a front view.

FIG. 7 (a) is a front view schematically illustrating an experiment for measuring the strength of a box culvert when a box culvert is rehabilitated using the spiral tube reinforcing material of the present invention,
(B) is a side view thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Belt 11 Substrate 12 Step-down part 13 Socket 14 Diagonal locking rib 15 Fitting ridge 17 Reinforcement rib 20 Reinforcement material 21 Reinforcement main body part 22 Reinforcing bar 30 Drainage pipe 40 Backfill material 51 Hume pipe 61 Box culvert

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI // B29K 105: 22 B29L 9:00 23:00

Claims (3)

[Claims] 1. A helical tube lining the inner peripheral surface of an existing tube, so that it is helically wound and attached to a flexible band-like body in which adjacent side edges are joined to each other. A reinforcing material, which is formed into a strip so that when the strip is spirally wound, the strip is plastically deformed so as to hold the spirally wound strip along the inner peripheral surface of the existing pipe. A reinforcing material for a helical tube, comprising: a belt-shaped reinforcing main body portion locked in a longitudinal direction with respect to the reinforcing main body portion; and a reinforcing bar integrally attached to the reinforcing main body portion. 2. The belt-shaped member is spirally wound together with the spiral tube reinforcing member in a state where the spiral tube reinforcing member according to claim 1 is locked to the band member, and adjacent side edges are joined to each other. A helical tube using a helical tube reinforcing material, wherein the helical tube reinforcing material is formed by performing the following. 3. A spiral formed by spirally winding the belt-shaped body to which the reinforcing material for a spiral tube according to claim 1 is attached and joining adjacent side edges to each other to form a spiral tube. A method of lining an existing pipe, comprising filling a backfill between the spiral pipe and the existing pipe after lining the inner peripheral surface of the existing pipe with the pipe.