JP2582991B2 - Rehabilitation method for existing pipes and coating for rehabilitation of existing pipes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an existing pipe rehabilitation method for rehabilitating an already installed pipe such as a water pipe or a sewer pipe, and a rehabilitation coating for the existing pipe.

[0002]

2. Description of the Related Art In general, fume pipes, ceramic pipes, cast iron pipes and the like are widely used as water pipes and sewage pipes buried underground. The inner peripheral surface of these pipes has been eroded and deteriorated by hydrogen sulfide and other corrosive gases and deposits, etc., due to long-term use, and the pipes have been reduced in thickness and strength. Also, joints between pipe pipes may shift due to ground pressure or land subsidence, etc., and gaps may occur, or cracks may occur in part of pipe pipes due to overload, etc., and groundwater etc. may enter into pipe pipes from this part. Infiltration or running water flowing through the pipe may leak into the ground. There is a possibility that the earth and sand around the pipe spills out due to the infiltration of the groundwater and the like into the pipe spill or water leakage, and a cavity is formed on the back of the pipe skewer, which may cause a road surface collapse.

As a countermeasure, a repair method disclosed in Japanese Patent Application Laid-Open No. 3-265798 has been proposed. As shown in a perspective view in FIG. 5, this method includes an impervious, elastically deformable sleeve 41 having an outer diameter smaller than the inner diameter of an existing pipe (not shown), and a tubular form that can be expanded. A base 42 disposed inside the sleeve 41 in the inserted state,
And a fixing means 43 for maintaining the spread state of the base 42 are carried into a predetermined place where the surface of the pipe is cut in advance in the duct, and the base 42 is spread by the spreader.
The sleeve 41 is pressed against the inner peripheral surface of the pipe by holding the base 42 in an expanded state by the fixing means 43 to form an impermeable membrane on the inner peripheral surface of the pipe. It is a rehabilitation method.

As shown in an exploded perspective view of the base 42 in FIG. 6, a fixing means 43 for maintaining the base 42 in an expanded state in the cover 41 is provided at one end of an elongated sheet-like base 42 at the width of the base 42. A plurality of tongue pieces 44 formed by cutting and raising at intervals in the direction and a plurality of holes 45 formed at the other end of the base 42 are inserted into the holes 45 and locked. It has become.

According to the existing pipe rehabilitation method, an impervious film is formed at a crack generating portion of the pipe and a joint between the pipes. Even in the case of an existing pipe with a gap, infiltration of groundwater into the pipe and leakage from the pipe can be prevented, and the strength of the pipe can be greatly improved.

The fixing means is disclosed in Japanese Patent Application Laid-Open No. 3-746.
As shown in FIG. 98 and shown in FIG. 7, a plurality of Z-shaped female engaging portions 47 provided along each of a plurality of virtual lines spaced in the longitudinal direction of the base 46 are provided. ,
The other end of the base 46 is constituted by a male engaging portion 48 which is formed by slightly bending the male engaging portion 48 according to the pressing force of the covering body on the pipe. And an extended portion 50 having a pair of saw-tooth-shaped portions 51 extending in parallel from one end edge of the base 49 at intervals in the width direction of the base 49 as shown in FIG. And any one of the teeth of the serrated portion 51 is engaged with the cutout 52 formed in the base 49 to maintain the base 49 in a state of being expanded into a cylindrical shape.

[0007]

However, in the above-mentioned cover, the base is in the form of a sheet or a sheet having deformed portions formed on both edges and protruding outward in the radial direction. When the base is opened by opening, both ends of the laminated base are displaced in the axial direction with respect to each other, or the diameter of the coating in one of the axial directions is larger than the diameter of the other, that is, the base is not formed in a truncated cone shape. There is a risk that the rules will be expanded.

[0008] As a result, the covering is not maintained in the expanded state accurately, so that the sleeve is not evenly and reliably pressed against the inner peripheral surface of the pipe, and has a sufficient water stopping effect and pipe fitting. There is a problem that the strength of the rail cannot be improved. In the case shown in FIG. 7, the female engaging portion provided on the base is interposed between both ends of the base, and is not laminated in a state where both ends are in close contact, and the sleeve is uniformly formed on the inner peripheral surface of the tube. There is a problem such as that it cannot be pressed.

Accordingly, an object of the present invention is to provide a method of rehabilitating an existing pipe spar which can be maintained in a state of being accurately expanded on the inner peripheral surface of the pipe skewer and which can secure a sufficient water stopping effect and strength of the pipe slab. And a rehabilitation coating.

[0010]

According to the present invention, there is provided a method for rehabilitating an existing pipe sluice, wherein an elastically deformable sleeve having a water impermeability is accommodated in the sleeve. In the existing pipe rehabilitation method of expanding the sheet-like base wound into a cylindrical shape and pressing the sleeve against the inner peripheral surface of the existing pipe, it is formed on the base and along the circumferential direction of the base. Inserting and guiding the locking piece protruding from the base into the extending fitting hole, expanding the base while regulating the displacement of both ends of the base in the axial direction, and pressing the sleeve against the inner peripheral surface of the tube, Further, the locking piece is locked to one end of the base to maintain the base in an expanded state. In addition, the rehabilitation coating for that purpose is formed by expanding a sheet-like base, which is housed in an elastically deformable sleeve having water impermeability and is wound into an expandable tubular shape, by expanding the tube. A plurality of locking pieces protrudingly formed on the base for retaining at one end of the base and maintaining the base in an expanded state, in the rehabilitation covering of the existing pipe for pressing the sleeve against the inner peripheral surface of the base; And a fitting hole for inserting a locking piece that relatively moves in the circumferential direction with the expansion of the base and guiding the locking piece in the circumferential direction of the base.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a method for rehabilitating an existing pipe sluice and a cover for rehabilitation according to the present invention.

FIG. 1 is a perspective view of a rehabilitation coating 1.
The cover includes an elastically deformable sleeve 10 and an elastically deformable sheet-like base 20.

The sleeve 10 is made of a water-impermeable polymer material such as rubber or synthetic resin, and has a cylindrical portion 1.
A plurality of protruding portions 12, 13, 14, and 15 extending continuously in the circumferential direction on the outer periphery of the end portion are formed at each end in the axial direction. The protrusions 12, 13, 14, 15 are shown in FIG.
As shown in the sectional view taken along the line II-II in FIG. 1, it has a substantially right-angled triangle cross-sectional shape, and a portion corresponding to the base of the right-angled triangle is formed on the cylindrical portion 11 side.

The outermost protruding portion 12 and the innermost protruding portion 15 of the sleeve 10 are made of the same material as the tubular portion 11 and are integrally formed with the tubular portion 11. The intermediate protrusions 13 and 14 located between the protrusions 12 and 15 are made of a water-swellable material, for example, a water-absorbent resin such as an ether-based polyurethane elastomer, an isobutylene-maleic anhydride copolymer, or a water-absorbent resin such as these. It is formed of a mixture of resin and chloroprene rubber, natural rubber, or the like, and has a height dimension larger than that of the protrusions 12 and 15.

The intermediate protruding portions 13 and 14 correspond to the cylindrical portion 11.
The protrusions 13 and 14 and the cylindrical portion 11 may be integrally joined or bonded at the time of molding or vulcanization.

On the other hand, the base 20 is made of a corrosion-resistant metal material such as stainless steel, copper, or a copper alloy, and has a cylindrical shape such that one end 21 is inside the other end 22 as shown in FIG. That is, after being deformed into a spiral shape, it is disposed inside the sleeve 10.

As shown in an exploded perspective view of FIG. 3, the base 20 has an elongated sheet-like base portion 23 which can be elastically deformed, and the sleeve 10 is accommodated along both side ends of the base portion 23 from both sides. It has an outwardly curved edge 24. The edge 24 protects the sleeve 10 in the case of sewage flowing through the pipe 35 and in the case of washing, and the base 20,
Therefore, the strength of the pipe 35 is improved.

A plurality of imaginary lines a, b, c, and d extending along the circumferential direction of the base portion 23 are separated from the one end 21 by a dimension substantially corresponding to the inner circumferential length of the pipe 35 to be rehabilitated. In addition, a plurality of locking pieces 25 are arranged in a row at a predetermined distance e along each of the virtual lines a, b, c, and d. The locking piece 25 is formed so as to protrude inward of the base 20 by cutting and raising having a predetermined width f.

On the other hand, a dimension e 'smaller than a predetermined dimension e between the one end 21 of the base portion 23 and the adjacent locking piece 25.
A fitting hole 26 formed of a long hole extending in the direction of the other end 22 along the virtual lines a, b, c, d is opened from the separated position. The fitting hole 26 has a dimension into which the locking piece 25 can be inserted, that is, a dimension g slightly larger than a predetermined width f of the locking piece 25.
And has a circumferential length h at which all of the plurality of locking pieces 25 formed on at least the imaginary lines a, b, c, and d can be fitted. The dimension from the position where the locking piece 25 is formed to the other end 22 has a dimension that covers the fitting hole 26.

Next, the rehabilitation coating 1 formed as described above
The method of rehabilitation of existing pipes using the method is explained.

Prior to rehabilitation, the inner peripheral surface of the pipe is cleaned by so-called high-speed cleaning in which high-pressure water is sprayed onto the inner peripheral surface of the pipe 35 to be rehabilitated. Surface treatment to remove dirt, adhered mortar, mixed tree roots, etc. on the inner peripheral surface of the pipe stub which cannot be removed by washing. In addition, since the sleeve 10 is protected by the edge portion 24, the pipe 3 which has been cut to accommodate the covering body in the past has been cut.
5 can be omitted.

Next, the cover 1 is mounted on a spreader 30 for expanding the cover 1.

The spreader 30 has a shaft 31 as shown in FIG.
And an inflating portion 32 fixed to the shaft portion 31 and expanding in a balloon shape by supplying compressed air or the like. The base portion of the cover 1 in a state where the inflating portion 32 of the spreader 30 is contracted. The cover 1 is attached to the spreader by inserting the cover 1 inside the cover 23.

Next, a state in which the expansion portion 32 is expanded by a pressure fluid, for example, compressed air, supplied to the nipple 33 via a hose from a fluid source disposed on the ground, and the cover 1 is not displaced with respect to the spreader 30. Is maintained.

Subsequently, the rope 34 connected to the spreader 30 is repaired to a repair location such as a crack generation part or a seam part in the pipe 35 in which the covering 1 and the spreader 30 are to be rehabilitated.
Is moved in the pipe 35 by pulling it toward the other end. The cover 1 and the spreader 30 can be moved to a predetermined position by monitoring the image from the TV camera on a monitor while moving the TV camera together with the cover 1.

When the cover 1 and the spreader 30 are moved to the repair location in the pipe 35, the inflated portion 32 is moved to the nipple 31.
Further expanded by the pressurized fluid supplied via. As a result, the base portion 23 of the cover 1 is expanded, and the base portion 2 is expanded.
3 is expanded to the extent that the locking piece 25 can be engaged with one end 21 of the sleeve 3, and as a result, the sleeve is pressed against the inner peripheral surface of the tube 35 and is compressed and deformed. When the cover 1 is pressed against the inner peripheral surface of the tube 35, the protrusions 12, 13, 14, 15 are mainly elastically deformed.

When the base portion 23 is expanded by the expanding device 30, the locking piece 25 moves along the fitting hole 26 in a state of being inserted into the fitting hole 26. The two ends 21 and 22 are prevented from being relatively displaced in the axial direction, the base portion 23 is accurately expanded, and the cover 1 is held in the pipe 35 in a correct state.

Next, after the pressurized fluid in the expansion section 32 is removed and the expansion section 32 is contracted, the expander 30 is removed from the tube 35 together with the television camera.

When the inflatable portion 32 contracts, a force for reducing the diameter of the base portion 23 acts on the base portion 23 by the contraction of the sleeve 10, and the locking piece 25 of the base portion 23 is moved to the base portion 23.
To one end. As a result, the diameter of the coating 1 is slightly reduced.
15 is absorbed by a slight restoration. For this reason, the protruding portions 12, 13, 14, 15 of the sleeve 10
The inner peripheral surface 36 of the pipe 35 is pressed and maintained in a compressed state. As a result, water leakage from the inside of the pipe 35 and leakage into the pipe 35 are prevented.

As shown in FIG.
By forming a plurality of locking portions 25 with a gap e along b, c and d, even if there is an error in the size of the pipe 35, the locking piece 25 is selected and the base portion 23 is formed. Can be securely locked to the one end 21 of the first member.

The engaging portion 25 and the fitting hole 26 can be easily formed by cutting and raising such as press working and shearing, and the edge 24 formed in the longitudinal direction of the base 23.
However, when the locking piece 25 is locked to the one end 21 of the base portion 23, the mechanical strength against the acting force from the radial direction of the cover 1 toward the inside is improved, and the rigidity of the tube 35 is improved. .

[0032]

According to the rehabilitation method for existing pipes and the coating for rehabilitation of existing pipes of the present invention described above, when the base is expanded and the sleeve is pressed against the inner peripheral surface of the pipe. Since the locking pieces projecting inward from the base are expanded while being inserted and guided in fitting holes extending along the circumferential direction of the base, both ends of the base to be laminated are not shifted from each other in the axial direction. And, by inserting the locking piece inward from the fitting hole, the both ends of the base are kept in close contact with each other, and the sleeve is appropriately stretched with uniform pressing force on the inner peripheral surface of the tube, A sufficient water stopping effect of the existing pipe canals and improvement of the strength of the pipe can be secured.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a rehabilitation coating for an existing pipe sluice according to the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is an exploded perspective view of a base used for the cover shown in FIGS. 1 and 2;

FIG. 4 is a cross-sectional view showing a state in which the cover is spread by a spreader.

FIG. 5 is a perspective view showing a conventional rehabilitation covering of an existing pipe.

6 is an exploded perspective view of a base used for the cover shown in FIG.

FIG. 7 is an exploded perspective view showing another base used for a conventional covering body.

FIG. 8 is a perspective view of a main part showing still another base used for a conventional covering body.

[Explanation of symbols]

 1 Rehabilitation cover 10 Sleeve 20 Base 25 Locking piece 26 Fitting hole 35 Pipe 36 Inner peripheral surface

Claims (4)

(57) [Claims] An inner peripheral surface of an existing pipe is formed by expanding an elastically deformable sleeve having water impermeability and expanding a sheet-like base wound in an expandable cylindrical shape and housed in the sleeve. In the rehabilitation method of the existing pipe squeezing the sleeve, the engaging piece formed in the base and extending along the circumferential direction of the base is inserted and guided by the locking piece projecting from the base,
The base is expanded while restricting the displacement of the both ends of the base in the axial direction, the sleeve is pressed against the inner peripheral surface of the tube, and the locking piece is locked to one end of the base to open the base. A method of rehabilitating existing pipes, characterized by maintenance. 2. An inner peripheral surface of an existing pipe by expanding an elastically deformable sleeve having water impermeability into the sleeve and expanding a sheet-like base wound in an expandable tubular shape. In a rehabilitation covering for an existing pipe squeezing a sleeve, a plurality of locking pieces projecting from a base for locking to one end of the base and maintaining the base in an expanded state, and an expansion of the base. A fitting for rehabilitating existing pipes, comprising: a fitting hole into which a locking piece that moves relatively in the circumferential direction with opening is fitted and guided in the circumferential direction of the base. 3. The rehabilitation covering according to claim 2, wherein a plurality of locking pieces are arranged along a circumferential direction of the base. 4. The rehabilitation covering according to claim 2, wherein the locking piece is formed by cutting and raising bent inward in the base.