JP2014114818A - Metal pipe repairing method and surrounding cover used in the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metal pipe repairing method capable of shortening a work period at low cost without cutting off water passing through a metal pipe and without limiting a construction time zone.SOLUTION: The metal pipe repairing method: polishes the peripheral part of a place to be repaired in which adhesive is coated on the micropore and fragile part of a metal pipe 10; sticks a tabular patch member 20 on the place to be repaired; coats the adhesive from above the metal pipe 10 and the pitch member 20; and attaches a synthetic resin-based surrounding cover 30 surrounding and covering the metal pipe 10 from above the surrounding cover.

Description

  The present invention relates to a repair method for a metal pipe in which a liquid flows, and more particularly to a repair method for a metal pipe in which water flows and an enclosure cover used in the metal pipe repair method.

  Conventionally, when a metal water pipe piped in a building has a hole and the water inside leaks, or when the rust is increased and left as it is, water leakage will occur. In case of concern, measures were taken to replace the water pipes of the entire building with new ones or to line the inner walls of the water pipes.

  The method of lining the inner wall surface of the water pipe is a well-known method as described in Patent Document 1. Examples of the material used for the lining include synthetic resins such as epoxy resins. There are various lining methods such as a parachute method and a pig method.

JP 2012-976 A

  However, if the water pipe is replaced with a new one, the cost becomes very high and becomes a big problem in terms of cost effectiveness. During construction, the entire building must be stopped. For example, in an office building, the construction time is limited to nights and holidays, so the construction period is considerably long. Furthermore, even at night and on holidays, there are cases where the office is used, which may cause inconvenience due to water stoppage. Also, in condominiums and the like, it is rather unavoidable to construct during the day, which causes inconvenience to the residents due to water stoppage. There are many problems due to the fact that the entire building must be stopped.

  On the other hand, the method of lining the inside of the water pipe has an advantage that the cost can be kept lower than when the water pipe is replaced. However, even with this lining method, it is necessary to stop the entire building during construction, so there is a problem with the water stop as in the case of replacing the water pipe.

  The present invention was made paying attention to such problems of the conventional technology, and it is not necessary to stop the water passing through the metal pipe during the construction, and the construction time is shortened without restricting the construction time zone. An object of the present invention is to provide a repair method for metal pipes that can be performed at a low cost.

The gist of the present invention for achieving the object lies in the inventions of the following items.
[1] This is a metal pipe repair method for repairing a pipe wall of a metal pipe (10) in which a liquid flows inside, where a brittle portion in which a small hole may be generated by a stimulus such as a minute hole or vibration is generated. And
Apply adhesive to the micropores and fragile parts of the metal tube (10),
A plate-shaped patch member (20) is stuck on the repair target part,
An adhesive is applied from above the metal tube (10) and the patch member (20), and a synthetic resin surrounding cover (30) is attached to surround the metal tube (10) from above. Metal pipe repair method.

[2] This is a metal pipe repair method for repairing a pipe wall of a metal pipe (10) in which water flows inside to repair a brittle part that may cause a small hole due to a stimulus such as a microhole or vibration. And
Apply a water-resistant adhesive to the micropores and fragile parts of the metal tube (10),
A plate-shaped patch member (20) is stuck on the repair target part,
A metal characterized in that an adhesive is applied from above the metal tube (10) and the patch member (20), and an FRP enclosure cover (30) is attached from above the metal tube (10) to cover the metal tube (10). Pipe repair method.

[3] A plurality of surrounding covers (30) are connected along the extending direction of the metal tube (10) so as to surround and cover the metal tube (10), and the entire connected surrounding cover (30) is molecularly bonded. The metal pipe repairing method according to item [1] or [2], wherein the surrounding cover (30) is formed so as to be united by lining with an agent.

[4] The surrounding cover (30) is divided into at least two parts having a connecting part (32) extending along the extending direction of the surrounding cover (30). 32) The metal pipe repair method according to any one of items [1] to [3], wherein the metal pipe (10) is surrounded by fixing them together.

[5] When enclosing and covering the metal tube (10) including the joint portion (12) where the metal tubes (10) are joined together, the enveloping cover (30) is used for the metal tube (10). The metal pipe repairing method according to any one of items [1] to [4], wherein the metal pipe repairing method includes using a joint cover portion (34) that covers the joint portion (12).

[6] The patch member (20) is formed with a variable portion (21) extending in a predetermined direction. The patch member (20) is bent by the variable portion (21) to be entirely outer peripheral wall (11) of the metal tube (10). The metal pipe repairing method according to any one of items [1] to [5], wherein the metal pipe (10) is attached to the metal pipe (10) in a state of being bent along the line.

[7] An enveloping cover (30) used in the metal pipe repair method described in any one of [1] to [6].

The present invention is constructed as follows.
Metal sewage pipes and water pipes in which water flows inside corrode to the state just before the occurrence of rust due to aging and micro-holes, or damage such as opening of small holes due to physical stimulation such as vibration. May be progressing. Such a state of the metal pipe (10) such as the sewage pipe or the water pipe is discovered by water leakage from the metal pipe (10).

  Such repair of the leaking metal pipe (10) is performed on the outside of the metal pipe (10), so that it is not necessary to stop the water flowing in the metal pipe (10). According to the metal pipe repair method according to the present invention, first, a water-resistant adhesive is applied to the micropores and fragile portions of the water pipe (10) in a normal use state. This stops water leaking from the micropores. Also, make sure that the vulnerable parts are not easily damaged.

Next, when the applied adhesive is solidified, the peripheral portion of the repair target portion where the adhesive is applied is polished to remove rust. Next, the plate-like patch member (20) is curved and attached using an adhesive so as to cover the repair target portion and the polished peripheral portion.
When the variable member (21) extending in the longitudinal direction of the metal tube (10) is formed when the patch member (20) is attached to the metal tube (10), it is bent at the variable member (21). Then, the entire patch member (20) is adhered to the metal tube (10) in a state of being curved along the outer peripheral wall (11) of the metal tube (10). Thereby, the patch member (20) can be better adhered to the outer peripheral wall (11) of the metal tube (10).

  Next, an adhesive is applied to substantially the entire metal tube (10) to which the patch member (20) is adhered, and the metal tube (10) is surrounded and covered by a synthetic resin surrounding cover (30). This completes the repair.

  When the surrounding cover (30) is made of FRP, a plurality of surrounding covers (30) are connected along the extending direction of the metal tube (10) so as to surround and cover the metal tube (10). The entire surrounding cover (30) is lined with a molecular binder. Thereby, the connected surrounding cover (30) is united, and the surrounding cover (30) itself becomes a tubular body. Therefore, even if water leakage or the like newly occurs from the metal pipe (10) itself, the surrounding cover (30) does not leak water to the outside.

  The surrounding cover (30) has a coupling part (32) extending along the extending direction, and is divided into at least two parts, and the coupling part (32) is fixed together to fix the metal tube. When it is intended to surround (10), it can be easily attached to cover the metal tube (10) even when the space between the piped metal tube (10) and the wall is narrow. it can.

  Further, when the metal pipe (10) is joined by a joint (12) such as a flange so as to surround and cover the metal pipe (10) including the joint (12), the metal pipe ( 10) What is necessary is just to use the surrounding cover (30) which has the junction part cover part (34) which covers the junction part (12) of each other. Thereby, the whole metal pipe (10) including a junction part (12) can be covered with the surrounding cover (30).

  Further, when the patch member (20) is formed with a variable portion (21) extending in a predetermined direction, the entire outer peripheral wall (11) of the metal tube (10) is bent by the variable portion (21). Therefore, it can be easily and satisfactorily adhered to the metal tube (10).

  According to the metal pipe repair method according to the present invention, since the repair is performed outside the metal pipe, it is possible to construct without stopping the water flowing in the metal pipe, and thus the metal pipe is disposed. Metal pipes can be repaired without inconvenience to building tenants, building users, building residents, and the like.

  Moreover, since it can construct without stopping the water which flows in a metal pipe, the construction time slot | zone is not restrict | limited in particular, A construction period can be shortened significantly.

  Furthermore, since the surrounding cover is integrated into a tubular body, even if the inner metal pipe is corroded and a new hole is opened, water does not leak from the surrounding cover, and the surrounding cover functions as a water pipe. Can fulfill.

It is a perspective view which shows the water pipe currently constructed | assembled with the repair method of the metal pipe which concerns on one embodiment of this invention. It is a flowchart which shows the repair method of the metal pipe which concerns on one embodiment of this invention. It is a side view which shows the state which attached the surrounding cover to the water pipe. It is the sectional view on the AA line in FIG. It is a side view which shows the connection part of the surrounding cover of the repaired water pipe. It is the BB sectional view taken on the line in FIG. It is a perspective view which shows the water pipe currently constructed with the repair method of a metal pipe using the surrounding cover of a different form. It is a longitudinal cross-sectional view which shows the state which cut | disconnected the surrounding cover in FIG. 7 along the longitudinal direction. FIG. 8 is a transverse cross-sectional view showing a state cut at the joint cover portion in FIG. 7. It is a perspective view which shows the state which opened the surrounding cover of the water pipe currently constructed with the repair method of a metal pipe using the surrounding cover of a different form. It is a side view which shows the inner side of the surrounding cover in FIG. It is explanatory drawing which looked at the water pipe currently constructed with the repair method of a metal pipe using the surrounding cover of a different form from the side.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a metal water pipe repaired by a metal pipe repair method according to an embodiment of the present invention, and FIG. 2 is a metal pipe repair method according to an embodiment of the present invention. It is a flowchart which shows. FIG. 3 is a side view showing a state in which the surrounding cover is attached to the water pipe, and FIG. 4 is a cross-sectional view taken along line AA in FIG. FIG. 5 is a side view showing the connecting portion of the envelope cover of the repaired water pipe, and FIG. 6 is a cross-sectional view taken along the line BB in FIG. In addition, in FIG. 6, the hatching which shows a cross section is put only in the cross section of the water pipe.

  As shown in FIG. 1, the present invention is a repair method for repairing a metal water pipe 10 in which water mainly flows inside such as a water pipe or a sewage pipe. In this repair method, a plate-like patch member 20 is attached to the outer peripheral wall 11 side of the water tube 10 to a weak portion that may break due to progress of rust and rust generated in the water tube 10, and further, the water tube The entire 10 is enclosed by a surrounding cover 30 so as to be covered.

  The patch member 20 is a plate-like member made of synthetic resin or metal. In particular, FRP (Fiber Reinforced Plastics) is preferable. The patch member 20 has a variable portion 21 extending in a predetermined direction. The variable portion 21 is a portion that is thinned by forming a groove, for example, and can be easily bent. In the illustrated example, the plurality of variable portions 21 extending linearly are formed so as to be parallel to each other.

  By having the variable portion 21, when the patch member 20 is attached to the water pipe 10, the extending direction of the variable portion 21 is made to coincide with the extending direction of the water pipe 10, and the patch member 20 is appropriately placed at the variable portion 21. The entire patch member 20 can be bent to be bent along the cylindrical surface of the outer peripheral wall 11 of the water tube 10. The illustrated patch member 20 is formed in a quadrilateral shape, but is not limited to a shape, and may be a circle, a triangle, or other polygons.

  The enveloping cover 30 surrounds and covers the water pipe 10 after the patch member 20 is attached to the minute hole or the fragile portion. The surrounding cover 30 is made of synthetic resin, but FRP is preferable. In the present embodiment, the surrounding cover 30 is described as being made of FRP.

  The encircling cover 30 shown in the figure has a shape obtained by dividing a cylindrical body into two equal parts along a plane along its longitudinal direction, and can surround and cover the water pipe 10 in pairs. The number of divisions is not limited to two and may be divided into three or more divisions. Moreover, the surface which divides | segments a cylindrical body along the longitudinal direction is not restricted to a plane, The surface which twisted the plane may be sufficient. Furthermore, you may make one incision over the full length along a longitudinal direction, without dividing | segmenting. In this case, the cut portion may be expanded and the water pipe may be covered from the expanded portion.

  The surrounding cover 30 includes a cylindrical side wall portion 31, a coupling portion 32 that is a flange extending radially outward from an edge portion extending along the longitudinal direction of the side wall portion 31, and both end edges of the surrounding cover 30. And a connecting portion 33 which is a flange extending radially outward from the both end edges.

  A plurality of openings through which the bolts b are passed are formed in the coupling portion 32 along the longitudinal direction of the surrounding cover 30. The openings are formed by surrounding the water pipe 10 with a set of surrounding covers 30 and then matching the positions of the openings formed in the coupling portions 32 of the sets of surrounding covers 30, 30. A set of enveloping covers 30 and 30 are fixed together by screwing nuts n into bolts b after passing through b.

  The connecting portion 33 is also provided with a plurality of openings for passing the bolts b. This opening is for connecting multiple sets of surrounding covers 30 to each other along the water pipe 10, and the positions of the openings formed in the connecting portions 33 of the adjacent sets are matched to each other, and bolts are connected to the openings. The nuts n are screwed into the bolts b after passing through b to fix the set of surrounding covers 30 and 30 so as to be integrated integrally.

Next, the process of the repair method of the water pipe 10 which concerns on embodiment of this invention is demonstrated.
In order to repair a fragile portion in which micropores are generated or corrosion has progressed and small holes are easily opened, the process shown in FIG. 2 is performed. During the repair, it is not necessary to stop the water flowing in the water pipe 10.

  First, the repair starts from a pretreatment process (step S1). In this pretreatment step, an adhesive is applied to the micropores and fragile portions of the water tube 10. For example, an adhesive having excellent water resistance such as an epoxy adhesive is applied. This treatment is to stop water leaking from the micropores, and the application to the fragile portion is to prevent the fragile portion from being damaged by vibration during construction.

  Next, when the applied adhesive is solidified, a polishing process (step S2) is performed. In this polishing step, rust is removed by polishing the peripheral portion of the repair target portion where the adhesive is applied. This treatment is intended to enable good adhesion with an adhesive material performed in the subsequent steps.

  Next, the patch process (step S3) which sticks the patch member 20 so that a repair object location and the said grinding | polishing periphery part may be covered is implemented. The patch member 20 is attached so that the extending direction of the variable portion 21 is the longitudinal direction of the water pipe 10. At that time, the variable portion 21 is appropriately bent so that the entire patch member 20 is deformed so as to follow the curvature of the outer peripheral wall 11 of the water tube 10, and then pasted on the adhesive that has been applied in advance to the repair target portion. To wear. Thereby, an opening can be closed reliably and a weak part can be reinforced.

  If the repair target part is extremely fragile and the repair target part may be damaged by vibration generated in the polishing process (step S2) even after the pretreatment process (step S1), the patch is used. The process (step S3) and the polishing process (step S2) may be reversed.

  Next, the surrounding cover attachment process (stitch S4) which surrounds the water pipe 10 with the surrounding cover 30 is performed. In this step, an adhesive is applied to substantially the entire water pipe 10 to which the patch member 20 is adhered, and then the water pipe 10 is surrounded and covered by two surrounding covers 30. Further, the openings formed in the side wall portions 31 of the surrounding covers 30 and 30 are matched to pass the bolt b, and the nut n is screwed to the bolt b to be integrally fixed. Furthermore, a molecular binding agent for FRP is applied to the entire surrounding cover 30 including the side wall portion 31 and its peripheral portion or the side wall portion 31. Thereby, it becomes a tubular body in which a pair of surrounding covers 30 and 30 are integrated.

  A set of surrounding covers 30, 30 can connect a plurality of sets. In this case, a pair of adjacent surrounding covers 30, 30 are connected to each other by matching the openings formed in the respective coupling portions 32, passing the bolts b, and screwing the nuts n to the bolts b. What is connected in this way is like a single tube. In this case, a molecular binder for FRP is also applied to the bonding portion 32. Thereby, it becomes a tubular body in which a plurality of connected surrounding covers 30 and 30 are integrated.

  In this way, the integrated surrounding cover 30 can serve as a water pipe through which the surrounding cover 30 passes even if the inner metal water pipe 10 is corroded.

  As described above, the minute holes and the fragile portion of the water pipe 10 can be repaired quickly and reliably without stopping the water flowing in the water pipe 10.

  Next, a modified example of the surrounding cover 30 will be described. In addition, the same code | symbol is attached | subjected to the site | part of the same kind as the said surrounding cover 30, and the overlapping description is abbreviate | omitted. FIG. 7 is a perspective view showing the water pipe 10 on which the metal pipe repair method is applied using the surrounding cover 30A of the modified example, and FIG. 8 shows a state in which the surrounding cover 30A is cut along the longitudinal direction. FIG. 9 is a cross-sectional perspective view showing a state in which the surrounding cover 30 </ b> A is cut at the joint cover portion 34. FIG. 10 is a perspective view showing the water pipe 10 on which the metal pipe repair method is applied with the surrounding cover 30A opened, and FIG. 11 is a side view showing the inside of the surrounding cover 30A. Furthermore, FIG. 12 is explanatory drawing which looked at the water pipe 10 by which the repair construction method of the metal pipe was constructed using the surrounding cover 30A from the side.

  As can be seen from FIGS. 10 and 12, the surrounding cover 30 </ b> A can cover the water pipe 10 including the portion where the water pipe 10 is joined by the flange 12. For this reason, the surrounding cover 30 </ b> A is provided with a joint cover portion 34 that covers the flange 12 of the water pipe 10.

  The joint portion cover portion 34 is formed such that the inner diameter when the joint portions 32 of the surrounding cover 30A are fixed together is larger than the outer diameter of the flange 12 of the water pipe 10, and the width is wider than twice the thickness of the flange 12. ing. The joint cover portion 34 may be formed integrally with the middle portion of the surrounding cover 30A, or may be formed separately and bonded so as to be integrated with the surrounding cover 30A on both sides using an adhesive during construction. You may do it. Further, for example, if the material of the surrounding cover 30A is FRP, the surrounding cover 30A is attached to the outer peripheral wall 11 of the water pipe 10, and the joining portion cover portion 34 is attached so as to cover the flange 12, and then the surrounding cover 30A and the joining cover 30A are joined. A molecular binder for FRP may be applied to the part cover part 34 so that they are integrated.

  The embodiments of the present invention have been described above with reference to the drawings. However, the specific configuration is not limited to the above-described embodiments, and the present invention can be changed or added without departing from the scope of the present invention. Included in the invention.

  For example, in the above-described embodiment, the patch member 20 has been described as having the variable portion 21 extending in a predetermined direction. However, the patch member 20 is formed in advance on the outer peripheral wall 11 of the water pipe 10 in accordance with the specifications of the water pipe 10. A plurality of types having different curvature radii may be prepared so as to substantially match each other, and a unit that matches the outer diameter of the water pipe 10 on site may be selected and used each time construction is performed. In this case, immediately after the polishing step (step S2), the operation of attaching the patch member 20 to the water pipe 10 can be started, and the construction time can be further shortened.

  Further, when there is no rust on the outer peripheral wall 11 but there is no need for polishing when a minute hole is opened for some reason, the polishing step (step S2) may be omitted.

  Furthermore, although the water pipe 10 extending linearly as a metal pipe to be repaired is illustrated and described, when repairing a Y-shaped or T-shaped water pipe or an elbow-shaped water pipe, the outer peripheral wall of the water pipe extends. Needless to say, it is sufficient to use an enveloping cover formed in a shape that matches the shape.

The present invention relates to a metal pipe repair method for repairing a metal water pipe in which water flows through the inside, in which a fragile portion where a small hole may occur due to a stimulus such as a microhole or vibration is generated on the pipe wall. However, what flows through the inside of the pipe is not limited to water, and can be widely applied to pipe bodies through which other liquids flow.
Further, the pipe to be repaired is not limited to a metal pipe, and can be applied to repair pipes of any material.

b ... bolt n ... nut 10 ... water pipe (metal pipe)
11 ... Outer wall 12 ... Flange (joint)
DESCRIPTION OF SYMBOLS 20 ... Patch member 21 ... Variable part 30 ... Surrounding cover 30A ... Surrounding cover 31 ... Side wall part 32 ... Coupling part 33 ... Connection part 34 ... Joint part cover part

Claims (7)

A metal pipe repair method for repairing a fragile part that may cause a small hole due to a stimulus such as a minute hole or vibration on the tube wall of a metal pipe through which liquid flows.
Apply adhesive to the minute holes and fragile parts of the metal tube,
A plate-shaped patch member is attached on the repair target area,
A metal pipe repairing method characterized in that an adhesive is applied from above the metal pipe and the patch member, and a synthetic resin surrounding cover is attached to surround the metal pipe from above. A metal pipe repair method for repairing fragile parts where small holes may occur due to stimulation such as micro holes or vibration on the wall of the metal pipe through which water flows,
Apply a water-resistant adhesive to the micropores and fragile parts of the metal tube,
A plate-shaped patch member is attached on the repair target area,
A metal pipe repairing method, wherein an adhesive is applied from above the metal pipe and the patch member, and an FRP enclosure cover is attached from above the metal pipe to surround and cover the metal pipe.   A plurality of surrounding covers are connected along the extending direction of the metal tube so as to surround and cover the metal tube, and the entire connected surrounding cover is lined with a molecular binder so that the surrounding cover is integrated. The metal pipe repairing method according to claim 1 or 2, characterized in that:   The surrounding cover is divided into at least two parts having a connecting part extending along the extending direction of the surrounding cover, and surrounds the metal tube by fixing the connecting parts together. The metal pipe repair method according to any one of claims 1 to 3, wherein:   When enclosing and covering the metal tube including the joint where the metal tubes are joined, the surrounding cover should be one having a joint cover portion covering the joint between the metal tubes. The metal pipe repair method according to any one of claims 1 to 4, wherein the metal pipe repair method is characterized.   The patch member is formed with a variable portion extending in a predetermined direction, and is attached to the metal tube in a state where the entire portion is bent along the outer peripheral wall of the metal tube by bending at the variable portion. The metal pipe repair method according to claim 1, wherein the metal pipe repair method is characterized.   The enclosure cover used for the metal pipe repair construction method as described in any one of Claim 1 to 6.

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