JP2004324835A - Repair tool for pipe and manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a repair tool for a pipe that can repair without stopping the liquid conveyance and touching to the leaked liquid when the liquid is leaked out from a steel pipeline such as straight pipe, bent pipe part or the like due to the corrosion etc. <P>SOLUTION: A leakage part is sealed by a packing that is made to execute face contact from point contact so that the tightening power of the tightening means 4 concentrates the sealing function of the packing on the leakage part by using the first band member 2 of circular arc having a bigger curvature than that of the pipe A and a packing 6 around central part and the second band member 3 having the inner circumference face to conform with the outer circumference face of the pipe A. Thereby, the repair of leakage can be done easily and certainly which makes the repair cost reduce because the repair work can be done efficiently. Also the first band member and the second band member can be manufactured by using a commercially available steel pipe and slicing it in rounds, which can reduce the production cost. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a pipe repair tool for stopping leakage of water or the like from a pipe wall of a pipe, and particularly to applying a packing to a leaked portion of the pipe, pressing the packing by a tightening force and deforming the packing along the outer peripheral surface of the pipe, thereby performing a leak. The present invention relates to a pipe repair tool for sealing a location and a method for manufacturing the same.
[0002]
[Prior art]
When leakage of liquid such as water occurs due to cracks or pinholes caused by corrosion of piping, various piping that can work without stopping liquid supply as a technology to seal the leaked point with simple construction Repair tools have been proposed and put into practical use.
For example, Patent Document 1 discloses a piping in which a packing band is superimposed on the inner peripheral surface of a flexible metal band and wound around the piping, and washers fixed to both ends of the flexible metal band are fastened with bolts to face each other. No. 3 describes a leak stop fitting. Further, in Patent Document 2, the inner surface of the repair tool main body is formed substantially along the outer circumference of the pipe, and has an opening so as to be detachably fitted to the outer circumference of the pipe from the radial direction. A pipe repair tool is disclosed in which a seal body is interposed between the pipe and the outer surface of the pipe, and the repair tool body is pressed and fastened to the outer surface of the pipe by a fastener. Further, in Patent Document 3, a defective portion of a pipe is covered with a sealing surface of a sealing component, a pressing bolt is brought into contact with the sealing component, a pressing component is disposed, and a holding component disposed on a side opposite to the defective portion of the piping. A method of repairing a pipe in which a plate is locked at both ends thereof with a pressing part and a sealing surface of the sealing part is pressed against a defective portion by tightening a pressing bolt is described. Also, cited document 4 applies a gasket to the pipe leaking part, There is described a pipe repair tool in which the gasket is held by a pair of clamp members to be held and the clamp member is fastened by bolts and nuts.
[0003]
[Patent Document 1]
Japanese Utility Model Application Laid-Open No. 61-199005 [Patent Document 2]
JP-A-59-83890 [Patent Document 3]
JP-A-5-71687 [Patent Document 4]
Japanese Utility Model Publication No. Sho 62-167995
[Problems to be solved by the invention]
However, Patent Documents 1 and 2 have a structure in which the packing is in close contact with the entire outer periphery of a pipe having a predetermined width including a leak location, and must be strongly tightened to completely seal the leak. In addition, the cited document 3 has a structure in which packing is applied to a local area including a leakage point and sealing is performed by tightening a pressing bolt. Since the holding plate must be locked to the pressing part after the bolts are aligned, it takes a long time to set the repair tool, the workability is poor, the number of parts is large, and the repair cost is high. Further, in the cited document 4, a gasket is applied to a leak location, and is held by a clamp member in a state of being in contact with the outer periphery of the pipe. In such a configuration, if one of the clamp members for pressing the gasket has substantially the same curvature as the pipe, the tightening force of the bolts and nuts acts on the entire gasket, and the sealing function of the gasket is reduced. There is a problem that it is difficult to concentrate on.
An object of the present invention is to eliminate the drawbacks of the above-mentioned conventional technology, and when leakage occurs from a straight pipe or a curved pipe portion due to corrosion from a steel pipe, without stopping the liquid supply, and furthermore, to the leaked liquid. Another object of the present invention is to provide a pipe repair tool that can be repaired without touching the pipe.
Another object of the present invention is to provide a method for manufacturing a pipe repair tool that uses a commercially available steel pipe and realizes a low manufacturing cost.
[0005]
[Means for Solving the Problems]
The invention according to claim 1 is a pipe repairing tool for sealing a leaked portion of a pipe, wherein the pipe repair tool is formed to have a larger curvature than the pipe and a length shorter than half of the outer peripheral length of the pipe, and to be provided at both ends in a radial and outward direction of the pipe. An arc-shaped first band member having an elongated mounting portion and a packing disposed at a substantially central portion of the inner surface, and formed to have a length shorter than half of the outer peripheral length of the pipe and conforming to the outer peripheral surface of the pipe; An arc-shaped second band member having an inner peripheral surface and a mounting portion extending radially and outwardly of the pipe at both ends, and a mounting portion of the first band member and the second band member. Fastening means for fixing both members to the pipe, the pipe being sandwiched between the first band member and the second band member, and the packing of the first band member being applied to a leaked portion of the pipe, Is fixed by the fastening means, and the fastening force By deforming the first band member to surface contact packing from point contact, characterized in that sealing the leakage point of the piping.
According to a second aspect of the present invention, in the first aspect, the mounting portions of the first band member and the second band member are connected as separate members.
According to a third aspect of the present invention, in the first or second aspect, the fastening means is a bolt.
[0006]
The invention of claim 4 is the method for manufacturing a pipe repair tool according to claim 2, wherein the first band member cuts a steel pipe having a curvature larger than the pipe at a predetermined width, and then cuts the half of the outer peripheral length of the pipe. It is formed by cutting into a short length to form an arc-shaped band portion, connecting a mounting portion to both ends of the band portion in a horizontal and outward direction, and further arranging a packing at a substantially central portion of an inner periphery. The second band member cuts a steel pipe having an inner peripheral surface that matches the outer peripheral surface of the pipe at a width substantially equal to that of the first band member, and then cuts the steel pipe to a length shorter than half the outer peripheral length of the pipe. An arc-shaped band portion is formed, and a mounting portion is connected to both ends of the band portion in a radial and outward direction of the pipe.
According to a fifth aspect of the present invention, in the third aspect, the band portions of the first band member and the second band member are formed by cutting a steel pipe into three equal parts.
A sixth aspect of the present invention is characterized in that, in the third aspect, a bolt hole for fastening is formed in a mounting portion of the first band member and the second band member.
[0007]
Effect of the Invention
According to the pipe repair tool of the present invention, the packing has a curvature larger than the curvature of the pipe because the packing is brought into point contact with the leakage point from the point contact so that the tightening force of the fastening means concentrates the sealing function of the packing at the leakage point. Since the arc-shaped first band member is used, leakage is completely sealed. In the case of a leak in a curved pipe section, a branch pipe section, or the like, it can be applied by selecting a bandwidth. Further, by using bolts and nuts as the fastening means, it is possible to easily and reliably mount the device with a monkey and a spanner efficiently in a short time without requiring specialized knowledge.
[0008]
According to the method for manufacturing a pipe repair tool of the present invention, since the first band member and the second band member are manufactured by cutting a steel pipe into a circle, a commercially available steel pipe can be used, and the manufacturing cost can be reduced.
[0009]
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing a use state of a pipe repair tool according to the present invention, and FIG. 2 is a perspective view of the pipe repair tool according to the present invention. In the present embodiment, the pipe repair tool is applied to a pipe for agricultural water. However, the pipe repair tool can also be used for repairing leakage of a liquid feed pipe for sending a liquid. The water supply used here includes liquid supply.
[0010]
The pipe repairing tool 1 is composed of an arc-shaped first band member 2 and a second band member 3 arranged so as to sandwich the pipe A, and a fastening means 4 for fastening these two members and fastening them to the pipe. The first band member 2 has a curvature larger than that of the pipe A and is formed to have a length enough to cover the leakage point 13 of the pipe A. At both ends, mounting portions 5 extending radially and outwardly of the pipe A are provided. . The length of the first band member 2 is preferably slightly shorter than half the outer peripheral length. A packing 6 is provided at a substantially central portion on the inner side facing the outer peripheral surface of the pipe A. The packing 6 is preferably a rubber flat plate. The second band member 3 has an inner peripheral surface corresponding to the outer peripheral surface of the pipe A and is formed to have a length corresponding to the first band member 2. A part 7 is provided.
[0011]
By increasing the thickness of the first band member 2 and the second band member in proportion to the pipe diameter of the pipe, the strength of the band is ensured. When the pipe A is sandwiched between the first band member 2 and the second band member 3, the outer periphery of the pipe A is arranged so that the two mounting portions 5 and 7 face each other and a gap 8 for tightening is provided between the two portions. It is formed with a length shorter than half of the length. The mounting portions 5 and 7 are formed by bending both ends of both band members 2 and 3 or by integrating separate members by welding, and a bolt hole 9 is formed.
[0012]
A usage mode of this embodiment will be described. The bolt 10 is held on the mounting portion 5 of the first band member 2 by fastening means 12 such as a nut or a rubber washer having a diameter slightly smaller than the diameter of the bolt, thereby preventing the bolt 10 from dropping. The pipe A is sandwiched between the first band member 2 and the second band member 3, and the packing 6 of the first band member 2 is applied to the leak portion 13 of the pipe A. In this operation, if the surface of the leak tube has irregularities, it is preferable to use a soft sponge-based packing.
Since the curvature of the first band member 2 is larger than the curvature of the pipe A, the packing 6 comes into point contact with the leakage point 13. When the bolt 10 and the nut 11 are tightened in this state, the first band member 2 is deformed to the pipe A side by the tightening force, and the packing 6 is brought into surface contact with the outer peripheral surface of the pipe A, thereby sealing the leaked portion 13.
[0013]
Even if the band member is mounted slightly offset from the leakage point, it can completely stop the water if it does not deviate from the packing in the axial direction of the pipe, and increase the nut that leaks even if it displaces in the direction perpendicular to the axial direction. Tighten and loosen the nut on the other side to completely stop the water.
Here, the fastening means 4 is not limited to the bolt holes 9, the bolts 10 and the nuts 11 of the mounting portions 5 and 7 described in the present embodiment, and other fastening means can be applied.
[0014]
According to the present embodiment, the following effects are expected.
(1) The band width can also be selected and used for the leakage of the curved pipe section, the branch pipe section, and the like.
(2) If the pressure of the agricultural water (about 0.2MP to 0.4MP) is used, the operation can be performed without touching the water by using the mounting device while the water is leaking.
(3) In the case where the repair band is formed by cutting a steel pipe into a section, a commercially available steel pipe can be used, so that the manufacturing cost can be reduced.
(4) With respect to standardized pipes such as agricultural water pipes, pipe repair tools for each application can be prepared in advance and stored for a long period of time, so that it is possible to respond quickly when necessary.
(5) By using bolts and nuts as the fastening means, it is possible to easily and reliably mount the apparatus with a monkey and a spanner without requiring specialized knowledge, and to obtain high work efficiency.
[0015]
Next, an embodiment of a method for manufacturing a pipe repair tool will be described. 3 to 7 are diagrams illustrating steps of an embodiment of a method for manufacturing a pipe repair tool. In this embodiment, the attachment portions provided at both ends of the first band member and the second band member are formed of members separate from the band member, but both ends of the band member are bent outward to be integrally formed. You can also.
[0016]
After cutting the steel pipe 20 having a larger curvature than the repair pipe at a predetermined width W, for example, a half of the pipe diameter (see FIG. 3), the steel pipe 20 is cut to a length shorter than half the outer peripheral length of the repair pipe, and an arc-shaped band portion is formed. 21 are formed (see FIG. 4). In this example, the band portion 21 is formed by dividing into three equal parts, and a plate-like mounting portion 22 as another member is prepared (see FIG. 5). A mounting portion 22 is connected to both ends of the band portion 21 in a horizontal and outward direction by welding (see FIG. 6), and a bolt hole 23 is formed in the mounting portion 22 to produce a first band member (FIG. 6). 7). A packing 23 is disposed substantially at the center of the inner periphery of the first band member as shown in FIG. Similarly, the second band member is manufactured by using the steel pipe 20 having substantially the same curvature as the repair pipe in accordance with the steps shown in FIGS.
[0017]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the pipe repair tool of this invention, the 1st band member of an arc shape which has the curvature larger than the curvature of a pipe, and provided packing in the substantially center part, and the 2nd which has the inner peripheral surface which matches the outer peripheral surface of a pipe. Since the band member is used and the packing completely seals the leaked part by tightening the two members, the repair of the leak is simple and reliable, and the work can be performed efficiently, so that the repair cost can be reduced.
[0018]
According to the method for manufacturing a pipe repair tool of the present invention, since the first band member and the second band member are manufactured by cutting a steel pipe into a circle, a commercially available steel pipe can be used, and the manufacturing cost can be reduced. In addition, by arranging the steel pipes for the repair band in line with the piping for each application and the diameter of the pipe, a repair band that can be quickly fitted after receiving an order can be manufactured, and the construction period can be shortened.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a use state of a pipe repair tool according to the present invention.
FIG. 2 is a perspective view of a pipe repair tool according to the present invention.
FIG. 3 is a perspective view of a steel pipe for explaining steps of one embodiment of a method for manufacturing a pipe repairing tool according to the present invention.
FIG. 4 is a view showing cutting a steel pipe of a round slice into three equal parts;
FIG. 5 is a diagram showing a cut band portion and a mounting portion.
FIG. 6 is a diagram showing a state in which attachment portions are welded to both ends of a band portion.
FIG. 7 is a view showing a state in which a bolt hole is formed in a mounting portion.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Piping repair tool, 2 ... 1st band member, 3 ... 2nd band member, 4 ... Fastening means, 5 ... Mounting part of 1st band member, 6 ... Packing, 7 ... Mounting part of 2nd band member.

Claims (6)

In a pipe repair tool that seals the leak point of the pipe,
The pipe is formed to have a curvature larger than the pipe and shorter than half of the outer circumference of the pipe, and has a mounting portion extending radially and outward at both ends of the pipe, and a packing disposed at a substantially central portion of the inner surface. An arc-shaped first band member,
An arc-shaped second band member formed to have a length shorter than half of the outer circumference of the pipe, having an inner circumference that matches the outer circumference of the pipe, and having, at both ends, mounting portions extending radially and outwardly of the pipe. When,
Fastening means for fixing the first band member and the second band member to the pipe using an attachment portion between the first band member and the second band member,
The pipe is sandwiched between the first band member and the second band member, the packing of the first band member is applied to a leak point of the pipe, and the mounting portion of both members is fixed by the fastening means. A pipe repair tool, wherein a first band member is deformed to bring the packing from point contact to surface contact to seal a leaked portion of the pipe. 2. The pipe repairing tool according to claim 1, wherein the attachment portions of the first band member and the second band member are connected as separate members. The piping repair tool according to claim 1 or 2, wherein the fastening means is a bolt. A method for manufacturing a pipe repair tool according to claim 2,
The first band member cuts a steel pipe having a larger curvature than the pipe at a predetermined width, and then cuts the pipe to a length shorter than half the outer peripheral length of the pipe to form an arc-shaped band portion. And it is configured by connecting the mounting part outwardly, and further arranging packing almost in the center part of the inner circumference,
The second band member is formed by cutting a steel pipe having an inner peripheral surface that matches the outer peripheral surface of the pipe to have a width substantially equal to that of the first band member, and then cutting the steel pipe to a length shorter than half the outer peripheral length of the pipe. A method for manufacturing a pipe repair tool, comprising: forming an arc-shaped band portion; and connecting a mounting portion to both ends of the band portion in a radial and outward direction of the pipe. The method according to claim 3, wherein the band portions of the first band member and the second band member are formed by cutting a steel pipe into three equal parts. 4. The method for manufacturing a pipe repair tool according to claim 3, wherein a bolt hole for fastening is formed in a mounting portion of the first band member and the second band member.

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