JPH0374698A - Covering body for preventing water leakage for line and water leakage preventing method for line - Google Patents

Abstract

PURPOSE:To provide high water leakage preventing performance by a method wherein a water impermeable sleeve and a sheetform base arranged inside the sleeve are provided, a base is provided with a fixing means for maintaining the base when the base is expanded, and has approximately the same length in an axial direction as that of the sleeve. CONSTITUTION:A covering body 10 is arranged in a pipe 38. The covering body 10 comprises a sleeve 12 which is water-impermeable and resiliently deformable and provided on its outer peripheral surface with resiliently deformable protrusion parts 18, 20, 22, and 24 and a base 14 which is positioned inside the sleeve 12 and sheetform having length in an axial direction longer than a distance between the outer ends of the protrusion parts and has engaging parts 26 and 28 of a fixing means maintaining the base 14 in a cylindrical shape when it is expanded. The covering body 10 is arranged in a pipe 38, the base 14 is expanded through deformation of the sleeve 12 until the protrusion parts 18, 20, 22, and 24 are resiliently deformed, and is fixed. This constitution provides high water leakage preventing performance.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a covering used for preventing water from flowing out of a pipe such as a sewer pipe or from flowing into the pipe. The present invention relates to a method for preventing water from flowing out of a pipe and from flowing into the pipe.

In the present invention, water leakage refers to water flowing out of a pipe or water flowing into a pipe.

(Prior Art) As one method for preventing water leakage in pipelines such as sewer pipes, water supply pipes, and electric wire pipes, a rubber sleeve and the sleeve are disclosed in Japanese Utility Model Publication No. 18799/1983. A covering body comprising a coil spring disposed inside the
There is a repair method in which the sleeve is placed in a state where it is pressed by a coil spring against the inner wall surface of the pipe that defines the pipe path. However, with this repair method, the parts of the sleeve that are not in contact with the coil spring are easily deformed by the force directed from the periphery toward the center of the sleeve, making it easy for groundwater to flow into the pipe. It must be made thicker to increase its mechanical strength.

As one method for preventing gas leakage in gas pipes, as described in Japanese Utility Model Application Publication No. 60-24993, a rubber sleeve and an expandable sleeve disposed inside the end of the sleeve are used. There is a repair method in which a covering body comprising a pair of bands is placed in a state where both ends of the sleeve are pressed by the bands against the inner wall surface of a pipe defining a pipe path. However, in this repair method, the axial center of the sleeve is easily deformed by forces directed from around the sleeve toward the center, so in order to increase the mechanical strength of the center, the mechanical strength of the axial center of the sleeve is increased. Must.

In order to solve these problems, the present inventors developed a sheet-like base that has a pair of overlapping parts and is wound spirally so that one of the overlapping parts is inside the other; We have proposed a water leakage prevention method in which a covering body including a water stop member placed on the outer peripheral surface of the pipe is placed on the inner wall surface of the pipe.

In this water leakage prevention method, the covering is moved to a treatment site in a reduced state, and then expanded at the treatment site, so that it is placed on the inner wall surface of the pipe so as to cover the inner wall surface. In a state where the covering is placed on the area to be treated, the water stop member is pressed against the inner wall surface by the base to prevent water leakage, and the base maintains the sleeve pressed against the inner wall surface of the pipe.

(Problem to be Solved) However, in the covering used in the water leakage prevention method, the water-stopping member is abutted at a location corresponding to the overlapped portion of the base. It is not possible to prevent water leakage.

SUMMARY OF THE INVENTION An object of the present invention is to provide a water leakage prevention covering for a pipeline, which has high water leakage prevention performance without increasing the mechanical strength of the sleeve, and a water leakage prevention method using the same.

(Solution, Action, Effect) The water leakage prevention covering of the present invention includes a water-impermeable, elastically deformable sleeve, and an expandable spirally wound state inside the sleeve. a sheet-like base, the base having fixing means for maintaining the base in a generally cylindrical shape when expanded within the sleeve;
The base has an axial length approximately equal to the axial length of the sleeve.

The covering is moved to a predetermined location within a conduit having an inner diameter larger than the outer diameter of the sleeve. Next, the base is expanded into a cylindrical shape to elastically deform the sleeve until the sleeve is pressed against the inner wall surface of the pipe defining the pipe, and then the base is expanded into a cylindrical shape to maintain the sleeve in the elastically deformed state. The base is maintained in the expanded state by the fixing means. Thereby, the covering body is attached to the inner wall surface of the tube with the sleeve being sandwiched between the base and the inner wall surface of the tube.

According to the covering of the present invention, since a sleeve having no abutting portion is used, water leakage can be reliably prevented.

Further, since the sleeve and the base have substantially the same axial length, the sleeve is supported by the base over almost the entire axial direction, and therefore there is no need to increase the mechanical strength of the sleeve.

Preferably, a plurality of elastically deformable protrusions extending continuously on the outer peripheral surface of the sleeve are formed at each end in the axial direction of the sleeve. As a result, when the base is expanded, the protrusion is mainly pressed against the inner wall surface of the tube and deforms elastically.
The protrusion comes into contact with the inner wall surface of the pipe due to its own restoring force to prevent water leakage.

Therefore, the sleeve can be made thinner.

Another covering of the present invention is a water-impermeable, elastically deformable sleeve having at least three elastically deformable protrusions extending continuously on the outer peripheral surface of the sleeve at each end in the axial direction. and a sheet-shaped base disposed inside the sleeve in an expandable spirally wound state, and fixing means for maintaining the base in a substantially cylindrical shape when expanded within the sleeve. a base comprising a base, the intermediate protrusion is made of a polymeric material that expands by absorbing water; It has an axial length.

The protrusions located at both ends prevent the intermediate protrusion from expanding entirely in the axial direction of the covering when the intermediate protrusion absorbs water and expands.

As a result, the intermediate protrusion is expanded radially outward of the sheath and pressed more firmly against the inner wall surface of the tube. Therefore, the water-stopping performance becomes higher.

If the structure is such that the inner part of each protrusion is restrained from expanding in the axial direction of the sleeve, the protrusion will mainly expand in the radial direction of the covering, and as a result, the protrusion will be more securely attached to the inner wall surface of the tube. Pressed.

It is preferable that each protrusion has a cross-sectional shape such that the thickness of the protrusion in the axial direction of the sleeve gradually decreases from the inner part to the outer part of the protrusion. As a result, when the covering is attached to the tube, the protruding portion is bent, so that even if the inner wall surface of the tube has some irregularities, the protruding portion is reliably pressed against the inner wall surface of the tube.

Preferably, the height of the intermediate protrusion made of a polymeric material that expands by absorbing water is greater than the height of the other protrusions. With this arrangement, since the intermediate protrusion is more easily deformed than the other protrusions, when the sleeve is pressed against the inner wall surface of the tube, the intermediate protrusion is largely deformed. As a result, when the base is kept expanded into a substantially cylindrical shape by the fixing means, even if the diameter of the base is reduced somewhat, this reduction in diameter is mainly absorbed by a slight restoration of the intermediate projection.

The fixing means includes a first portion disposed on the base and a plurality of second portions located on the base remote from the first portion and angularly spaced from each other. It is preferable to include. In this case, the first section is selectively engaged with the second section to maintain the base in a generally cylindrical shape when the base is expanded.

In this way, the first part and one of the second parts can be
Even if there is an error in the inner diameter of the location where the liner is to be placed, the liner can be maintained in a pressed state against the inner wall surface of the tube.

The water leakage prevention method of the present invention includes an elastically deformable sleeve that has an outer diameter smaller than the inner diameter of a pipe defining a pipe and is impermeable to water; a sheet-shaped base having an axial length substantially equal to the axial length of the sleeve, and fixing means for maintaining the base in a substantially cylindrical shape when expanded within the sleeve; disposing a covering body including a base at a predetermined location within the tube, expanding the base into a cylindrical shape to deform the sleeve until the sleeve is pressed against the inner wall surface of the tube and elastically deforms; The method includes maintaining the base in an expanded state by the fixing means to maintain the sleeve in an elastically deformed state.

Another water leakage prevention method of the present invention is to provide an elastically deformable sleeve that has an outer diameter smaller than the inner diameter of a pipe defining a pipe line and is impervious to water, and that is elastically deformable and continuously extends on the outer peripheral surface of the sleeve. a sleeve having a plurality of protrusions at each end thereof; and a plurality of protrusions located in an axial direction is of the sleeve, the protrusions being disposed inside the sleeve in an expandably spirally wound state. A covering body including a sheet-shaped base having an axial length equal to or greater than the distance between the outer ends and having fixing means for maintaining the base in a substantially cylindrical shape when expanded within the sleeve is placed within the tube. , and the base is expanded into a cylindrical shape (expanded) to deform the sleeve until the protruding part is pressed against the inner wall surface of the tube and elastically deformed, and the protruding part is elastically deformed. and maintaining the base in an expanded state by the fixing means to maintain the base in an expanded state.

Still another method for preventing water leakage of the present invention is to cut the pipe to form an annular recess along the inner wall surface of the pipe at a predetermined location in the pipe defining the pipe. an elastically deformable sleeve having a diameter and an axial length substantially equal to the axial length of the recess and being impervious to water; and an expandable spirally wound sleeve disposed inside the sleeve. a sheet-like base having an axial length substantially equal to the axial length of the sleeve, the base having fixing means for maintaining the base in a substantially cylindrical shape when expanded within the sleeve; The covering body is moved to the recess, and the base is expanded into a cylindrical shape to deform the sleeve until the sleeve is pressed against the inner wall surface of the tube and elastically deformed. and maintaining the base in an expanded state by the fixing means to maintain the sleeve in an elastically deformed state within the recess.

Still another method for preventing water leakage of the present invention is to cut the pipe to form an annular recess along the inner wall surface of the pipe at a predetermined location in the pipe defining the pipe. a plurality of elastically deformable protrusions extending continuously on the outer peripheral surface of an elastically deformable sleeve having a diameter and an axial length substantially the same as the axial length of the recess and being water-impermeable; at each end, and the outer end of the protrusion located at the axially extreme end of the sleeve, which is disposed inside the sleeve in an expandably spirally wound state. a sheet-like base having an axial length equal to or greater than or equal to the length of the base, the base having a fixing means for maintaining the base in a substantially cylindrical shape when expanded within the sleeve, to the location of the recess. the base is expanded into a cylindrical shape to deform the sleeve until the protrusion is pressed against the inner wall surface of the tube and elastically deforms, and the covering is disposed in the recess; The fixing means C maintains the base in an expanded state in order to maintain the base in an elastically deformed state within the recess.

(Example) Referring to FIG. 1, a covering 10 includes an elastically deformable sleeve 12 and an elastically deformable sheet-like base 14. The sleeve 12 is preferably made of a water-impermeable polymeric material such as rubber or synthetic resin. On the other hand, the base 14 is preferably made of a metal material having corrosion resistance, such as stainless steel, copper, or copper alloy.

The sleeve 12 has a plurality of protrusions 18, 20 degrees 22, 24 formed at each end in the axial direction of the cylindrical portion 16 so as to extend continuously on the outer peripheral surface of the corresponding end. The protrusions 18, 20, 22° 24 are as shown in the second @,
It has a right triangular cross-sectional shape, and is formed so that the portion corresponding to the base of the right triangle is on the cylindrical portion 16 side.

The protruding portion 18 located at the outermost side, that is, the outermost end in the axial direction of the sleeve 12, and the protruding portion 24 located at the innermost side (center side) are made of the same material as the cylindrical portion 16. It is made in one piece. In contrast, the intermediate protrusion 20.22 located between the two protrusions 18.24 is made of a polymeric material that absorbs water and expands. As the polymeric material that absorbs water and expands, for example, synthetic rubber sold by Asahi Denka Kogyo Co., Ltd. under the trade name Azoka Ultra Seal can be used.

However, instead of making the protrusion 20.22 made of a polymeric material that absorbs water and expands, it may be made of the same material as the tubular part 16, and the protrusion 20.22 may be made of a polymeric material that expands upon absorbing water. It may be made of a material that is elastically deformable, particularly easily expanded and contracted. Also,
All of the protrusions 18, 20° 22, 24 may be made of a polymeric material that absorbs water and expands.

The inner part of the protrusion 20.22 is embedded in the cylindrical part 16. As a result, the protrusions 20° 22 are prevented from being displaced in the axial direction of the sleeve 12. Instead of embedding part of the projection 20.22 in the tubular part 16,
The protrusion 20.22 may be adhered to the cylindrical portion 16, or the protrusion 20.22 and the cylindrical portion 16 may be integrally joined or bonded during molding or vulcanization.

A female engaging portion 26 is formed at one end of the base 14 in the longitudinal direction. The female engaging portion 26, as shown in FIG.
It is composed of a long metal fitting having a double-shaped cross section and fixed to the base 14. The female engaging portion 26 extends across the entire width of the base 14 . The male engaging portion 28 that is received in the female engaging portion 26 and engages with the female engaging portion is the other end of the base 14 in the illustrated example, but other shapes of engaging portions such as female The engaging portion may be made of a metal fitting similar to the engaging portion 26.

As shown in FIG. 1, the base 14 is deformed into a cylindrical shape, that is, into a spiral shape, so that the female engaging part 26 is inside the male engaging part 28, and then placed inside the sleeve 12. Ru.

In this state, the base 14 is restrained by the sleeve 12 and is prevented from expanding. Thereby, relative movement between the sleeve 12 and the base 14 in the axial direction of the sleeve 12 can be prevented without using special metal fittings.

The base 14 may be deformed into a spiral shape when it is inserted into the sleeve 12, or it may be wound into a spiral shape in advance so that it can be inserted into the sleeve 12. Further, the base 14 may be arranged inside the sleeve 12 so that the female engaging part 26 is outside the female engaging part 28.

The inner diameter of the sleeve 12, the axial length of the sleeve 12, the thickness of the cylindrical portion 16, the height of the protruding portion, the cross-sectional shape of the protruding portion, and the thickness of the protruding portion are determined based on their mutual relationships and water leakage prevention treatment. It can be arbitrarily selected depending on the size of the pipe to be treated, the size of the area to be treated, etc. However, the outer diameter of the sleeve 12 is smaller than the inner diameter of the pipe to be treated for leakage prevention. Further, the inner diameter of the sleeve 12 is smaller than the outer diameter of the base 14 when the base 14 is expanded so that the engaging portions 26 and 28 thereof are engaged.

In the illustrated example, the height of the protrusion 18.24 is greater than the thickness of the tubular portion 16, and the height of the protrusion 20.22 is greater than the thickness of the protrusion 18.
．． It is larger than that of 24. However, the height of the protrusion 18.24 may be smaller than the thickness of the cylindrical portion 16, or may be the same as the thickness of the cylindrical portion 16. In addition, the protruding portion 18,
The heights of 20°22.24 may be the same.

For example, in the case of a sleeve for a sewer pipe with a nominal diameter of 250 mm, the inner diameter of the sleeve 12, the cylindrical portion 16 of the sleeve 12,
, the height of the protrusion 18.24, and the protrusion 20
．． The heights of 22 are 180 to 220 mm, 0.
5-1mm.

It can be 2 to 5 mm and 5 to 10 mrn.

In the illustrated example, the width or axial length of the base 14 is approximately the same as the axial length of the sleeve 12, but is greater than or equal to the distance between the outer ends of both protrusions 18 located at the axially extreme ends of the sleeve 12. That's fine. The length of the base 14 is greater than the length along the inner surface of the sleeve 12, but varies depending on the inner diameter of the pipe to be treated for leakage prevention. The thickness of the base 14 may be less than that of the sleeve 12, for example 0.
．． It can be 5-3mm&.

Next, a water leakage treatment method using the covering 10 will be explained.

As shown in FIG. 4, the covering 10 is first placed in a spreader 30 that spreads the covering.

The expander 30 includes a shaft portion 32 and an expansion portion 34 that is fixed to the shaft portion at intervals in the axial direction of the shaft portion and is expanded into a floating ring shape by a pressurized fluid such as compressed air. As such an expander 30, for example, a water stop valve sold under the trade name Bakker by Toa Grout Kogyo Co., Ltd., one of the applicants of the present invention, can be used.

The expander 30 is received inside the base 14 with the expansion part 34 being deflated.

Next, the expansion part 34 is expanded by a pressurized fluid such as compressed air supplied from a fluid source located on the ground to the nipple 36 via a hose to such an extent that the covering 10 is not displaced with respect to the expander 30. , is maintained in that state. Nipple 36 is attached to shaft 32, and shaft 32 has a flow path for pressurized fluid supplied to nipple 36.

As shown in FIG. 4, a recess 40 in which the covering 10 is placed is formed at a portion of the pipe 38 to be treated to stop water. The recess 40 extends continuously in the circumferential direction on the inner wall surface of the tube 38. The axial length of the recess 40 is the same as that of the covering 10.
The depth of the recess 40 is approximately the same as that of the protrusion 2.
It is slightly smaller than the thickness of the covering body 10 including the height of 0. The location to be treated may be a connection or joint between adjacent tubes, or a crack formed in a tube.

The jacket 10 and expander 30 are then moved within the tube 38 from one end thereof to the location of the recess 40 . Covering body 1
0 and the expander 30 can be moved within the tube 38 by, for example, pulling the lobe 42 connected to the expander 30 toward the other end of the tube 38. The covering body 10 and the expanding machine 30 can be moved to a predetermined position by moving the television camera that images the inside of the tube 38 together with the covering body 10 and the expanding machine 30 and monitoring the image taken by the television camera on a monitor. .

Once the sheath 10 and the expander 30 are moved into position within the tube 38, the inflatable portion 34 is further inflated by pressurized fluid supplied via the nipple 36. This results in
The covering 10 is expanded to the extent that both ends of the base 14 slightly overlap, that is, to the extent that the inter-engaging portions 26 and 28 can be engaged, and is pressed against the inner wall surface of the tube 38. As a result, the sleeve 12 is compressed.

However, since the cross-sectional shape of the protrusions 18, 20, 22.24 is triangular, when the covering 10 is pressed against the inner wall surface of the tube 3, the protrusions 18, 20°22.24 are mainly elastically deformed. Ru. That is, in the illustrated example, as shown in FIG.
It is bent towards the side of the protrusion 24 and opposite the side of the protrusion 22 and is further compressed. As a result, each protrusion is pressed against the inner wall surface of the tube 38 by its restoring force.

When a sleeve without projections 18, 20, 22, 24 is used, the sleeve itself is pressed directly against the inner wall surface of the tube and compressively deforms.

Since the projection 18.24 is integral with the tubular section 16 and the projection 20.22 is prevented from displacing in the axial direction of the sleeve 12, the projections 18, 20, 22.2
4 is compressed, the proximal end portions of the protrusions 18, 20, 22.24, that is, the portions on the side of the cylindrical portion 16, do not expand in the axial direction of the sleeve 12, and as a result, the protrusions 18, 20, 22. 2
2.degree. 24 is firmly pressed against the inner wall surface of the tube 38.

The expander 30 is then removed from the tube 38 along with the television camera after the pressure fluid in the inflation section 34 is removed.

When the pressure fluid within the expansion section 34 is removed, the sleeve 12
exerts a force on the base 14 that causes the base 14 to contract, so that the male engaging portion 28 of the base 14 as shown in FIG.
is fitted into the female engaging portion 26. This allows base 14
is slightly reduced, but this reduction is due to the projections 18, 2O,
22°24 is absorbed by slight restoration.

For this reason, the protrusion 18, 20° 22.2 of the sleeve 12
4 is pressed against the inner wall surface of the tube 38 and maintained in a compressed state, as shown in FIGS. 4 and 5. As a result, water leakage from and into the pipe 38 is prevented, and the covering 10 is placed in the recess 40 so as not to protrude into the pipe 38.

According to the covering 10, the height of the protrusion 20.22 is greater than that of the protrusion 18.24;
2, which is a polymer material that absorbs water and expands, is more likely to be elastically deformed than the material of the protrusion 18.24, which does not expand even if it absorbs water. When the protrusion 20. is pressed against the inner wall surface of the tube 38, the protrusion 20.
22 is greatly deformed, and as a result, the amount of reduction in the diameter of the base 14 when fitting the ura engaging part 28 to the female engaging part 26 can be increased, making it easier to attach the covering. can.

Although the protrusion is shown not to be elastically deformed in FIG. 6, it is actually deformed as described above.

Furthermore, although it is shown that there is a gap between the sleeve 12 and the base 14, in reality, the sleeve 12 is made of an elastically deformable polymer material, so the gap shown in the figure is actually Not formed.

After the covering 10 is attached to the pipe 38, the water around the pipe 38 is removed from the pipe 3.
If water enters between the sheathing 10 and the tube 38 from the damaged area of the tube 38 or from the damaged area of the tube 38, the protrusion 20.22
absorbs the water and expands. As a result, the protrusion 20
．． 22 is strongly pressed against the tube 38, and the covering body 10 and the tube 38
Maintain watertightness between the In Figures 4 and 5,
Although a gap is shown to be formed between adjacent protrusions, the gap may not be formed depending on the amount of deformation and expansion of the protrusions 20.22.

Since the base 14 is sheet-shaped and the sleeve 12 is supported by the base over its entire inner circumferential surface, the sleeve 12 is slightly compressed and deformed even when a force due to groundwater pressure or the like is applied. It's nothing more than that.

When the pipe to be water-stopped is a power line pipe, a telephone line pipe, etc., the recess 40 does not need to be formed.

However, especially in the case of a sewer pipe, by arranging the covering 10 in the recess 40 so as not to protrude from the recess 40, it is possible to prevent foreign matter flowing down with the sewage from getting caught in the covering 10.

It is preferable to clean the inside of the pipe 38 before placing the covering 10 inside the pipe 38, and to prevent fluids such as sewage from flowing into the pipe 38 during repairs. Preferably, the inlet is closed.

The cross-sectional shape of the protrusion may have a shape other than the above.

The protruding portion 44 shown in FIG. 7(A) has an isosceles triangular cross-sectional shape, and the protruding portion 46 shown in FIG. 7(B) and (C)
．． 48 has a cross-sectional shape like the tip of a brush, and the protrusion 50 shown in FIG. 7(D) has an inverted W-shaped cross-sectional shape. According to these protrusions, even if there are irregularities on the inner circumferential surface of the tube,
By pressing the protrusion against the inner wall surface of the tube, watertightness between the covering and the tube is maintained. However, the cross-sectional shape of the protrusion may be a trapezoidal shape.

The protrusion 52 shown in FIG. 7(E) has a tubular cross-sectional shape. Even in the case of a covering body having such a protruding part 52, when the covering body is pressed against the inner circumferential surface of the tube, the protruding part 5
2 is mainly elastically deformed.

The engaging portion serving as a fixing means for maintaining the base 14 in the expanded state does not need to be continuous in the width direction of the base 14. Further, the fixing means for maintaining the base 14 in the expanded state may be an engaging portion having a shape and type other than those in the above-described embodiments.

The base 54 shown in FIG. 8 has female engaging portions 56 at a plurality of locations spaced apart in the width direction at one end in the longitudinal direction. The female engaging portion 56 is made of metal fittings having a double-shaped cross section, and the metal fittings are fixed to the base 54 at intervals in the width direction of the base 54. In the illustrated example, the embroidery engaging portion 58 that is received in the female engaging portion 56 and engages with the female engaging portion 56 is also
Although this is the other end of the base 54, it may be an engaging portion of another shape.

The female engaging portion is, like the base 60 shown in FIG. 9(A),
A female engagement portion 6 consisting of a tongue piece that is formed by pressing a portion of the base 60 from one side of the base 60 to the other side.
2, or may be a female engaging portion 66 formed by bending one end of the base 64 into a Y-shape, as in the base 64 shown in FIG. 9(B). , the base 6, such as the base 68 shown in FIG. 9(C).
The female engaging portion 70 may be formed of a plurality of holes (or grooves) formed at one end of the female engaging portion 8 .

When using the female engaging part 70 shown in FIG. 9(C), the male engaging part 72 can be a protrusion formed on the other end of the base 68 so as to be able to fit into the female engaging part 70. .

A plurality of female engaging portions or a plurality of male engaging portions may be formed at intervals in the longitudinal direction of the base as a fixing means for maintaining the base in the expanded state. In this way, one of the male engaging part and the female engaging part can be engaged with the other, so the engaging parts to be engaged with each other can be adjusted according to the pressing force of the sheathing against the pipe. can be selected.

The fixing means for the base 4 shown in FIG.
a plurality of female engaging portions 76° 78.80 along each of a plurality of imaginary lines spaced apart in the longitudinal direction; and a female engaging portion 82 that is selectively engaged with the female engaging portions. and has. The female engaging portion 76.78° 80 consists of a two-shaped metal fitting fixed to a predetermined portion of one end of the base 74. On the other hand,
The female engaging portion 82 is the other end of the base 74 and is slightly bent relative to other parts. According to the base 74, the male engaging portion 82 can be engaged with either the female engaging portion 76, 78 or 80;
The female engaging portion to be engaged with can be selected depending on the pressing force of the covering against the tube.

The fixing means for the base 84 shown in FIG.
, 88.90 and the male engaging portion 9 which is the other end of the base 84.
2. The female engaging portion 86,88,90 is connected to the base 8.
A portion of the base 84 is formed of a tongue piece that is pushed out from one side of the base 84 to the other side by pressing or the like. The male engaging portion 92 is
It is slightly bent relative to the rest of the body.

The fixing means for the base 94 shown in FIG. The male engaging portion 102 is engaged with the male engaging portion 102. The female engaging portions 96 and 98° 100 are two-shaped metal fittings fixed to a predetermined portion of one end of the base 94.
It is continuous in the width direction of 4. On the other hand, 5 miscellaneous engagement parts 10
2 is #1lffi other than the base 94, and is slightly bent relative to other parts.

The fixing means for the base 104 shown in FIG.
a plurality of retaining portions 106° 108, 110, 112 located at one end of the base 104 and spaced apart in the longitudinal direction of the base 104;
It has an engaging part 114 that engages with any one of the engaging parts. The engaging parts 106, 108, 110, 112 are made of members having a triangular cross-sectional shape, and
04 (fixed. The engaging portion 104 is connected to the base 104
The other end is the engaging portion 106, 108, 110.
, 112 for easy engagement. Each of the engaging parts 106, 108, 110, and 112 may be divided into a plurality of parts in the width direction of the base 104.

The fixing means for the base 116 shown in FIG.
118120.122 consisting of a plurality of rectangular holes formed in a matrix at one end of the base 116.
Engagement part 12 consisting of a plurality of protrusions provided on the other end
It has 4ε. Each protrusion 124 is associated with a hole 118, 120, 122 corresponding to a row of the matrix and is engaged with one of the corresponding holes. Hole 118゜120.12
2 penetrates the base 116 in its thickness direction, and is formed in a rectangular shape with a pair of opposing sides extending in the width direction of the base 116. On the other hand, the engaging portion 124
has a cross-sectional shape of a right triangle, and one of the two surfaces corresponding to the two sides intersecting at right angles of the right triangle is on the other edge side of the base 116, and the other side is on the side of the other edge of the base 116.
It is fixed to the base 116 so as to be on the 16 side.

The fixing means for the base 126 shown in FIGS. 15 to 18 are as follows:
It has a pair of band-shaped extensions 128 that extend from one end edge of the base 126 in the width direction of the base 126 in parallel to each other at intervals. The end of the base 126 on the side opposite to the extension part 128 is deformed from other parts in one direction in the thickness direction of the base 126 to be slightly larger than the thickness of the base 126.

A pair of elongated notches 13 are formed in the deformed portion of the base 126 at intervals in the width direction of the base 126.
0 is formed. The cutout portion 130 corresponds to the extension portion 128 and extends from the width direction edge of the base portion 126 toward the center to receive the corresponding extension portion 128. The length of the notch 130 is the same as that of the corresponding extension 12.
It is almost the same width as 8. A serrated portion 132 is formed inside the distal end portion of the extension portion 128 . Serrated portion 132
Each tooth is engageable with a portion of the base 126 that defines a notch 130 .

The base 126 has an extension 128 as shown in FIG.
is passed through the notch 130 from the inside of the base 126 to the outside, and is placed inside the liner in a rolled state such that most of the extension 128 is outside the base 126. Further, as shown in FIG. 18, the base 126 is expanded into a cylindrical shape by engaging one of the teeth of the serrated portion 132 with a portion of the base 126 that defines the cutout portion 130. maintained. Therefore, in the base 126, the teeth of the serrations 132 and the portion defining the notch 130 of the base 126 act as a fixing means to maintain the base 126 in the expanded state.

Protrusions are not always necessary. However, if the covering body 10 in which the sleeve forms a protruding part is used, as shown in FIG. 10.

The present invention can be applied not only to water leakage prevention treatment at locations where water actually leaks, but also to water leakage prevention treatment at locations where there is a risk of water leakage due to aging, such as the joints of newly installed pipes.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing one embodiment of the covering material of the present invention;
Figure 3 is a sectional view showing an embodiment of the sleeve, Figure 3 is a perspective view of an embodiment of the base, Figure 4 is a sectional view showing the covering material being expanded by an expanding machine, and Figure 5 is FIG. 6 is an enlarged sectional view showing a state in which the protrusion is elastically deformed; FIG. 6 is a side view showing a state in which the female engaging part and the male engaging part are engaged; FIG.
A). (B), (C), (D), and (E) are views showing the cross-sectional shapes of other embodiments of the protrusion, respectively, FIG. 8 is a perspective view showing another embodiment of the base, and FIG. 9 ( A), (B) and (
C) are 2 and 1 illustrating other embodiments of the female engaging portion, respectively.
Figure 0 is a perspective view showing still another embodiment of the engaging part, No. 11.
12, 13 and 14 are perspective views showing still other embodiments of the base, and FIG. 15 is a perspective view showing a part of another embodiment of the base. A developed view showing the example, Fig. 16 is 16-16 in Fig. 15.
17 is an enlarged perspective view showing the state before the engagement portion of the base in FIG. 15 is engaged; FIG. 18 is an enlarged side view taken along the line; FIG. 18 is an enlarged perspective view of the base in FIG. FIG. 19 is a perspective view showing a state in which the parts are engaged with each other, and FIG. 19 is a view showing an embodiment in which the covering body is disposed within the tubes displaced from each other. 10: Covering body, 12 sleeve, 14.54, 60, 64.6B, 74, 84°92.1
04, 116, 126: Base, 1B, 20, 22, 2
4,44,46.48B0,52:Protrusion, 26.2B,56,58.62,66.70°72.7
6.78, 80.82, 86, 88°90.92, 96
,98,100,102゜106.108,110,1
12,114°118.120,122,124: Engaging portion, 130: Notch portion, 132: Serrated portion, 30: Expander, 38.38a. 38b: tube.

Claims (1)

[Scope of Claims] (1) Comprising a water-impermeable, elastically deformable sleeve and a sheet-like base disposed inside the sleeve in an expandable and spirally wound state; the base includes securing means for maintaining the base in a generally cylindrical shape when expanded within the sleeve; further, the base has an axial length approximately equal to the axial length of the sleeve;
Covering for preventing water leakage of pipes. (2) The water leakage prevention covering according to claim (1), wherein the sleeve has a plurality of elastically deformable protrusions extending continuously on the outer circumferential surface of the sleeve at each end in the axial direction. (3) A water-impermeable, elastically deformable sleeve having at least three elastically deformable protrusions extending continuously on the outer peripheral surface thereof at each end in the axial direction; a sheet-like base disposed inside the sleeve in a spirally wound state, the base having fixing means for maintaining the base in a substantially cylindrical shape when expanded within the sleeve; The intermediate protrusion is made of a polymeric material that expands upon absorption of water, and the base has an axial length that is equal to or greater than the distance between the outer ends of the protrusion located at the axially extreme end of the sleeve. , Water leakage prevention covering. (4) The water leakage prevention covering according to claim 3, wherein an inner portion of the intermediate protrusion is restrained from expanding in the axial direction of the sleeve. (5) The water leakage prevention covering according to claim 3, wherein the thickness of the protrusion in the axial direction of the sleeve gradually decreases from the inner part to the outer part of the protrusion. (6) The height of the intermediate protrusion made of a polymeric material that absorbs water and expands is greater than the height of the other protrusions.
The water leakage prevention covering according to claim (5). (7) The fixing means includes a first part disposed on the base and a plurality of fixing means arranged at an angular interval from each other in a part of the base separated from the first part. 2 parts, wherein the first part is selectively engaged with the second part to maintain the base in a substantially cylindrical shape when the base is expanded. ) The water leakage prevention covering described in ). (8) an elastically deformable sleeve that is water-impermeable and has an outer diameter smaller than the inner diameter of the pipe defining the pipe; and an expandable, spirally wound sleeve disposed inside the sleeve. The base further includes a sheet-shaped base having an axial length that is approximately the same as the axial length of the sleeve, and a base that includes fixing means that maintains the base in a substantially cylindrical shape when expanded within the sleeve. A covering body is placed at a predetermined location within the tube, and the base is expanded into a cylindrical shape to deform the sleeve until the sleeve is pressed against the inner wall surface of the tube and elastically deformed, and the sleeve is elastically deformed. A method for preventing water leakage in a conduit, comprising maintaining the base in an expanded state by the fixing means so as to maintain the base in an expanded state. (9) An elastically deformable sleeve that is water-impermeable and has an outer diameter smaller than the inner diameter of the pipe that defines the pipe, and has a plurality of elastically deformable protrusions that continuously extend on the outer peripheral surface of the sleeve. At least the distance between the sleeve provided at each end and the outer end of the protrusion located at the axially extreme end of the sleeve, which is arranged inside the sleeve in an expandable spirally wound state. a sheet-like base having an axial length of , and having fixing means for maintaining the base in a substantially cylindrical shape when expanded within the sleeve, the covering body is placed at a predetermined location within the tube. the base is expanded into a cylindrical shape to deform the sleeve until the protrusion is pressed against the inner wall surface of the tube and elastically deforms, and the base is expanded into a cylindrical shape to maintain the protrusion in the elastically deformed state. A method for preventing water leakage in a conduit, the method comprising maintaining the base in an expanded state by a fixing means. (10) Cutting the pipe to form an annular recess along the inner wall surface of the pipe at a predetermined location within the pipe that defines the pipe,
an elastically deformable sleeve having an outer diameter smaller than the inner diameter of the tube and an axial length substantially the same as the axial length of the recess and being impervious to water; and a state in which the sleeve is spirally wound in an expandable manner. a sheet-like base having an axial length substantially equal to the axial length of the sleeve, the base being disposed inside the sleeve and maintaining the base generally cylindrical when expanded within the sleeve; moving a covering including a base provided with fixing means to the recess, and expanding the base into a cylindrical shape to deform the sleeve until the sleeve is pressed against the inner wall surface of the tube and elastically deforms. and placing the covering in the recess, and maintaining the base in an expanded state by the fixing means to maintain the sleeve in an elastically deformed state within the recess. How to prevent water leakage. (11) Cutting the pipe to form an annular recess along the inner wall surface of the pipe at a predetermined location within the pipe that defines the pipe, and having an outer diameter smaller than the inner diameter of the pipe and an axial direction of the recess. an elastically deformable sleeve that has approximately the same axial length and is water-impermeable, and has a plurality of elastically deformable protrusions at each end that extend continuously on its outer peripheral surface; , having an axial length equal to or greater than the distance between the outer ends of the protrusion located at the axially extreme end of the sleeve, which is disposed inside the sleeve in an expandably spirally wound state. a sheet-like base having fixing means for maintaining the base in a generally cylindrical shape when expanded within the sleeve, is moved to the location of the recess, and the protrusion is aligned with the Expanding the base into a cylindrical shape to deform the sleeve until it is pressed by the inner wall surface of the tube and elastically deforms, the covering body is placed in the recess, and the protrusion is elastically deformed within the recess. A method for preventing water leakage in a conduit, the method comprising: maintaining the base in an expanded state by the fixing means so as to maintain the base in an expanded state.