JP2001071380A - Pipe repairing material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure good repair effects by lining the inner surface of a bent pipe without generating a non-contact part by forming it from a cylindrical fiber repairing material main body impregnated with a curable resin and a cylindrical impermeable coat covering the outer surface of the main body and the main body from a knitted cloth. SOLUTION: A cylindrical knitted repairing material main body 3 is pulled into a cylindrical thin abrasion-resistant polyurethane coat film 1 to form a repairing material before being impregnated with a resin. A room temperature- curable epoxy resin is cast from an opening 5 on one side of the repairing material into the main body 3 and moved on the repairing material from one side toward the other side by the rotation of a press roll 7 so that the whole main body 3 is impregnated with the epoxy resin to form a repairing material 9 for an underground pipe. Relatively long knit loops are drawn out to the inside of the main body 3 to form raising, and the resin is held to be prevented from flowing out easily by the raising.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tubular pipe repair material for repairing a pipe, such as an underground pipe, by lining it over its entire length or a long range. The present invention relates to a repair material suitable for a pipe having a large bent portion, such as a mounting pipe extending in a direction.

[0002]

2. Description of the Related Art In order to repair an underground pipe from the ground side over its entire length, a tubular repair material impregnated with a hardening resin, which is slightly longer than the underground pipe, is inverted inside the underground pipe by a reversing device. A repair method of inserting a repair material and keeping the repair material pressed against the inner surface of the underground pipe to cure the curable resin is used. The tubular repair material used in such a repair method includes a repair material body formed so as to be able to be impregnated with a curable resin, and an impervious tubular covering that covers and covers the repair material body. The repair material body is usually made of a nonwoven fabric such as polyester felt which is relatively inexpensive.

[0003]

By the way, nonwoven fabrics generally have poor elasticity and low flexibility. When the repair target is a main pipe that extends almost in a straight line, a sufficient repair effect can be achieved at low cost by using a non-woven repair material, but the mounting pipe is often greatly bent. When the repair material is repaired with such a repair material, as shown in FIG. 11, “wrinkles” or undulations E that do not contact the inner surface D of the repair tube A may occur inside the bent portion B of the repair tube A, as shown in FIG. Inner surface D inside the bent portion B
When a crack F is generated in a portion, it is impossible to stop water from flowing from the crack F.

Accordingly, an object of the present invention is to provide a pipe repairing material capable of securing an excellent repairing effect by lining the inner surface of the pipe so that a non-contact portion does not occur even if the pipe is largely bent. .

[0005]

According to the present invention, there is provided a pipe repair material of the present invention for impregnating a curable resin, and being inserted forward while being turned upside down in a pipe to line the inner surface of the pipe. A pipe repair material, comprising: a tubular fiber repair material body impregnated with the curable resin; and an impervious tubular covering body that covers an outer surface of the repair material body. The main body is made of knitted fiber. The repair material main body is manufactured by knitting with a knitting machine, for example, a circular knitting machine using polyester yarn, for example. The repair material body has sufficient elasticity and flexibility by the loop of the knitted fabric, but is preferably knitted so as to have greater elasticity in the circumferential direction than in the axial direction. For example, when repairing the mounting pipe, a relatively small reversing device with a small pressing force is used, but the repair material main body is knitted so as to have a softness that can be easily reversed even at a low pressure. Should.

[0006] The repair material main body is often knitted relatively hard by flat knitting so that the surface becomes flat, but it is preferable that a long loop is drawn out on the back side to form raised hair. When the raised material is formed, the resin holding capacity of the repair material main body increases, and at the time of lining, the extremely soft raised material comes into contact with the inner surface of the pipe, so that there is a contact between the repair material and the inner surface of the pipe. Defective parts are unlikely to occur.

[0007]

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

FIG. 1 is a view showing the construction process of a repair material for underground pipe according to the present invention for repairing an attachment pipe, and FIG. 2 is a sectional view showing the structure of the repair material for underground pipe.

A knitted tubular repair material main body 3 is drawn into a thin, wear-resistant tubular coating film 1 made of polyurethane to form a repair material before resin impregnation (FIG. 1a). Next, a cold-setting epoxy resin is poured into the repair material main body 3 from the one-side opening 5 of the repair material, and the pressing roller 7 is rotated and moved from one side to the other side on the repair material to perform the repair. An underground pipe repair material 9 is formed by impregnating the entire material body 3 with a room temperature curable epoxy resin (FIG. 1b). As shown in FIG. 2, the outer surface side (the inner surface side at the time of reverse insertion) of the repair material main body 3 is formed in a flat shape, but a knit loop 11 having a relatively long foot is pulled out inside to form a raised 13. The epoxy resin impregnated with this brushed 1
3 keeps it from flowing out easily.

FIG. 3 is a perspective view of a reversing device for reversing the underground pipe repair material 9.

The reversing device 15 comprises a metal body 17 formed in a short cylindrical shape and a long cylindrical cover 19 hermetically attached to the outer periphery of the rear end of the body 17, and has a slender overall shape. It is formed in a cylindrical body. The main body 17
A small-diameter portion 23 having an outward flange 21 for retaining at a leading end, a tapered portion 25 whose diameter increases rearward from the rear end of the small-diameter portion 23, and extends rearward from the rear end of the tapered portion 25. , An outward flange 27 at the rear end for retaining
(See FIG. 4) and a large diameter portion 29 formed with
The large-diameter portion 29 is connected to a regulator (not shown) for regulating and maintaining the internal gas pressure at a predetermined value, which is constituted by an adjusting portion 31 having an operation handle and an exhaust pipe 33. Then, a supply pipe 37 which constitutes a pressurizing means is provided, and a pressure gauge 39 for displaying the internal pressure is connected to the tapered portion 25.

The cylindrical cover 19 has a cylindrical front side 41 having a short flexible opening at both ends and a cylindrical rear side 4 having a long flexible opening at both ends.
3, and outward flanges 45 and 47 (see FIG. 4) for retaining the front and rear ends, respectively, are formed.
1 and a short annular connecting member 49 made of metal to which the cylindrical front side portion 41 and the cylindrical rear side portion 43 are attached, and which is connected to the cylindrical rear side portion 43. The end is
It is composed of a tubular portion 53 having an outward flange 51 (see FIG. 4) for retaining at the tip and a lid 55 (see FIG. 4) integrally formed at the rear end of the tubular portion 53. The closed closing member 57 is attached and closed. To attach the cylindrical cover 19 to the main body 17, the distal end portion of the cylindrical front side portion 41 is covered outside the large-diameter portion 29 so as to pass over the outward flange 27, and a fastening band 59 is provided on the front side of the outward flange 27. This is performed by fixing to the large-diameter portion 29 of the main body 17. The cylindrical front side portion 4 of the cylindrical cover 19
1 and the cylindrical rear side portion 43 are attached to the annular connecting member 49 using the fastening bands 61 and 63, respectively, and the closing member 57 is attached to the cylindrical rear side portion 43 using the fastening band 65. The connection is performed in the same manner as the connection between the cylindrical front side portion 41 and the large diameter portion 29 of the main body 17. Each of the tightening bands 59, 61, 63, 65 is configured to be detachable, but the connection structure between the cylindrical front side 41 and the main body 17 and the annular connecting member 49, and the cylindrical rear side 43, The connection structure with the closing member 57 does not necessarily have to be configured to be removable. On the other hand, the connection structure between the cylindrical rear side portion 43 and the annular connecting member 49 needs to be configured to be detachable so that the cylindrical rear side portion 43 having an appropriate length can be selected and attached. .

Valves 67 and 69 for discharging air from the tubular cover 19 are attached to the annular connecting member 49 and the lid 55 of the closing member 57, respectively.

A small-diameter insertion hole 71 (see FIG. 4) is formed in the center of the lid 55 of the closing member 57.
A rope 73 for adjusting the reversing speed is passed through the insertion hole 71 so as to extend through the cylindrical cover 19 after passing through. The rope 73 is passed through the insertion hole 71 so as to be able to move in the front-rear direction, but almost or substantially airtight. Rope 7
A flexible wire or the like can be used for the cable 3.
And a rear side of the rope 73 is connected to a manual take-up reel 77.

A blocking means 79 is arranged or attached to the cylindrical front side 41 of the cylindrical cover 19. The blocking means 79 includes a pair of right and left columns 81, 81 on which male threads are formed.
A pair of right and left insertion holes 85 and 85 are formed, and a pair of right and left insertion holes 85 and 85 are formed. One of the columns 81 and the other column 81 are passed through the respective insertion holes 85 and 85. As a result, the movable pinch plate 87 attached to the columns 81, 81 so as to be able to move up and down, is screwed into each of the columns 81, 81 above the movable pinch plate 87, and rotated up and down along the columns 81, 81. The holding discs 89, 89 are movable. The cylindrical front side 41 of the tubular cover 19 is located between the columns 81, 81 and between the fixed holding plate 83 and the movable holding plate 87. It is attached to the front side 41. The movable sandwiching plate 87 has a holding disc 89
Can be moved upward until it touches. Accordingly, if the holding disk 89 is positioned above the support column 81, the movable holding plate 87 can move to the upper position of the support column 81 (the state shown in FIG. 3). It expands without being crushed while pushing up 87. On the other hand, when the holding disk 89 is moved to the lower side of the column 81, the movable holding plate 87 is moved.
Is moved downward by the pressing disc 89, and is crushed with the fixed holding plate 83 while sandwiching the cylindrical front side portion 41. The fixed clamping plate 83 and the movable clamping plate 87 are each formed in an inverted V-shaped cross section, and when sandwiched, the sandwiched portion of the cylindrical front side portion 41 is bent into a V-shape or a shape similar thereto, and sufficient blocking is achieved. It is configured to be in a state.

FIGS. 4 to 6 show a preparation process before the underground pipe repair material 9 is inserted into the mounting pipe.

The underground pipe repair material 9 impregnated with a cold-setting epoxy resin is inserted into an impermeable vinyl chloride calibration hose 91. One end (rear end) of the calibration hose 91 is closed, and one end is connected to the connecting member 75 at the tip of the rope 73 after the underground pipe repair material 9 is stored (FIG. 4). After connecting the calibration hose 91, the rope 73 is taken up by the take-up reel 77.
(See FIG. 3), the calibration hose 91 is drawn into the cylindrical cover 19, and the tip of the calibration hose 91 and the underground pipe repair material 9 (opening end) are folded back to form the outward flange 21. It is put over the outer periphery of the distal end of the main body 17 so as to slightly exceed it, and is fixed to the main body 17 using a fastening band 93 (FIG. 5). When compressed air is supplied from the compressor into the reversing device 15 via the supply pipe 37 (see FIG. 3), the calibration hose 91 and the underground pipe repair material 9 are reversed from the opening of the main body 17, that is, underground. The pipe repair material 9 advances forward with the raised 13 (see FIG. 2) side of the repair material main body 3 on the outside and the calibration hose 91 on the inside. When the calibration hose 91 and the underground pipe repair material 9 project from the opening of the main body 17 by an appropriate length (FIG. 6), the supply of the compressed air from the compressor is temporarily stopped, and the calibration hose 91 and the underground pipe repair are performed. The projecting tip of the material 9 is applied to the opening of the attachment pipe A of the wastewater mass G (see FIG. 7).

FIGS. 7 to 10 are views showing a repair process when the underground pipe repair material 9 in the reversing device 15 is inserted into the mounting pipe A to form a lining layer.

When the protruding tip of the calibration hose 91 and the underground pipe repair material 9 is applied to the opening of the mounting pipe A and compressed air is again supplied from the compressor into the reversing device 15, the calibration hose 91 and the underground pipe repair material 9 Numeral 9 advances inside the mounting tube A while being inverted, and stops when the entire calibration hose 91 is inverted (FIG. 7). In order to advance the calibration hose 91 and the underground pipe repair material 9 as quickly as possible, but without wrinkling or twisting, the reversing device 15 is used.
The inside of the calibrator is set to a slightly high pressure, and the speed of the take-up reel 77 (see FIG. 3) connected to the rope 73 attached to the rear end of the calibration hose 91 is manually controlled so that the rotation speed does not become too high. It is preferable to maintain the reversing speed of the calibration hose 91 at an appropriate value. The calibration hose 91 is formed in advance to have a length such that the tip (the rear end is inverted and becomes the front end) protrudes into the main pipe H at the end of the inversion.
Is formed in advance to have a length such that the tip thereof coincides with the root end of the mounting pipe A at the end of the inversion, or protrudes somewhat into the main pipe H.

The calibration hose 91 and the underground pipe repair material 9 are kept in a pressurized state for about one hour until the epoxy resin in the repair material main body 3 of the underground pipe repair material 9 is cured even after the reversal work is completed. Is done. During this hardening operation, the holding disks 89, 89 of the blocking member 79 are rotated and lowered, so that the cylindrical front side portion 41 is held between the fixed holding plate 83 and the movable holding plate 87 and crushed. Even if the cylindrical front side part 41 is crushed in this way,
During the hardening operation, the rope 73, the calibration hose 91, and the like do not move inside the cylindrical cover 19, so that no trouble occurs. Then, the valves 67 and 69 are opened to release the air in the cylindrical rear side portion 43, and the cylindrical rear side portion 43 is compactly folded (FIG. 8).

When the curable resin of the repair material main body 3 is sufficiently cured, the take-up reel 77 (see FIG. 3) is operated to take up the rope 73, thereby connecting the calibration hose 91 to the mounting pipe A and the repair material 9 Remove from inside. At this time, the pressing disc 89 is rotated to be raised, and the function of pressing the pressing disc 89 against the movable sandwiching plate 87 is released. Then, a post-treatment such as cutting the projecting portions at both ends of the cured underground pipe repair material 9 is performed to form a lining layer in the mounting pipe A by curing the underground pipe repair material 9 (FIG. 9). The lining layer is a good repair layer that is in contact with the entire inner surface D of the mounting pipe A even at a bent portion of the mounting pipe A. And the repair layer is the mounting pipe A
The structure has a structure in which the inner surface side of the repair material main body 3 which comes into contact with the inner surface D is protected by the coating film 1 (FIG. 10).

[0022]

As described above, the use of the pipe repair material of the present invention makes it possible to easily form a lining layer having no poor contact even in an underground pipe having a large bend.

[Brief description of the drawings]

FIG. 1 is a view showing a construction process of an underground pipe repair material according to the present invention for repairing an installation pipe.

FIG. 2 is a sectional view showing a structure of a repair material for underground pipes.

FIG. 3 is a perspective view of a reversing device for reversing the underground pipe repair material.

FIG. 4 is a view showing a preparation process before inserting an underground pipe repair material into an attachment pipe, and showing a state where a rope is connected to a calibration hose.

FIG. 5 is a view showing a preparation process before inserting the underground pipe repair material into the mounting pipe, and showing a state in which the calibration hose is drawn into the reversing device.

FIG. 6 is a view showing a preparation process before inserting the underground pipe repair material into the attachment pipe, and showing a state in which the repair material and the calibration hose are slightly inverted and advanced.

FIG. 7 is a view showing a repair process when the underground pipe repair material in the reversing device is inserted into the mounting pipe to form a lining layer, and is a view showing a completed state of reversal.

FIG. 8 is a view showing a repair process when a lining layer is formed by inserting a repair material for an underground pipe in a reversing device into an installation pipe, and shows a state in which pressure is applied to the repair material and a calibration hose. FIG.

FIG. 9 is a view showing a repair process in a case where a repair material for an underground pipe in a reversing device is inserted into a mounting pipe to form a lining layer, and is a view showing a state of formation of the lining layer.

FIG. 10 is a cross-sectional view showing details of a lining layer.

FIG. 11 is a view showing a state of forming a lining layer using a conventional underground pipe repair material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coating film (coating) 3 Repair material main body 9 Repair material for underground pipes 13 Brushed A Mounting pipe

Claims (2)

[Claims] 1. A tubular pipe repair material impregnated with a curable resin, inserted forward while being inverted inside the pipe, and lining the inner surface of the pipe, comprising a tubular fiber impregnated with the curable resin. Repair material body,
An impervious tubular covering body for covering an outer surface side of the repair material main body, wherein the repair material main body is made of a knitted fiber. 2. The repair material for pipes according to claim 1, wherein a raised material is formed by a knit loop on an inner surface side of the repair material main body.