JP2968071B2 - Joint repair method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint repair method for injecting a liquid sealant into a seal of a joint.

[0002]

2. Description of the Related Art Conventionally, to repair a leaked part of a joint,
Cover the entire joint with a cover, and then pressurize and inject a high-pressure sealant into the cover to force the sealant into the seal portion of the joint against the pressure of the transport fluid in the joint, and In addition, the sealant that has entered the leakage gap of the seal portion has been cured.

[0003]

However, in order for the sealant to sufficiently penetrate into the entire seal portion, the inside of the cover must be set to a considerably high pressure, especially when the transport fluid is at a high pressure. It had to be strong enough to withstand high pressure. In addition, if the joint has a large diameter, it is necessary to increase the size of the cover. As a result, the labor of the operator who handles the above-mentioned large-scale apparatus is also great, and the work also requires a long time.

The present invention has been made in view of the above circumstances, and has as its object to inject a liquid sealant into a seal portion of a joint, even if the transport fluid is at a high pressure or the joint has a large diameter. Repair can be performed quickly and successfully with relatively simple tools.

[0005]

The characteristic feature of the joint repair method according to the present invention is that a mounting for a working device with a shutter is mounted on a joint, and a drill of a drilling machine mounted on the mounting is opened by the shutter. Inserted from the passage of the mounting base that has been cut, in a state where the fluid ejection is suppressed by the mounting base and the drilling machine, pierced the joint by the drill, after pulling out the drill from the mounting base, closing the shutter. ,
An injection device provided with a discharge pipe for a sealant in place of the punching machine is mounted on the mount, and the distance between the upper end and the lower end of the seal portion in the longitudinal direction of the discharge pipe for the sealant is substantially the same. At two locations separated by a distance, discharge holes for discharging the sealant are respectively dispersed and arranged in advance, the shutter is opened, and the ejection of the fluid is suppressed by the mounting base and the injection device. A discharge pipe for a sealant is inserted into the joint from the passage, and the discharge direction of the discharge hole is
Positioned so as to face the upper end and the lower end at the same time,
The sealant is supplied from the inside to the seal portion of the joint from the discharge hole, the sealant is pressurized and penetrated into the seal portion of the joint by fluid pressure, and the discharge pipe is pulled out from the mounting table. The shutter is closed, a plug mounting machine is mounted on the mount in place of the injection device, the shutter is opened, and the fluid discharge is suppressed by the mount and the plug mounter. The structure is such that the hole of the joint is closed and the mounting base and the plug mounting machine are removed, and the operation and effect are as follows.

[0006]

[Operation] In other words, a hole is formed in the joint in a state where fluid ejection is suppressed, a sealant is supplied to the seal portion from the inner surface side of the joint by a discharge pipe inserted from the hole, and the sealant is applied to the seal portion by fluid pressure. Even if the transport fluid is at a high pressure and the joint has a large diameter, the mounting base can be formed into a relatively simple one without the necessity of a strong cover as in the above-mentioned prior art, because the pressurized infiltration is performed. The work can be easily performed by a punch, an injection device, and a plug mounting machine, and the sealant can be sufficiently penetrated into the gap of the seal portion in a state where the fluid transport is continued, so that good repair can be realized.

In particular, since the supply of the sealant from the discharge pipe to the seal portion is simultaneously performed from the discharge holes positioned so as to face the upper end portion and the lower end portion of the seal portion at the same time, the lower end portion is sufficiently provided. An appropriate amount of the sealant can be reliably supplied, and the seal at the lower end, which has been performed only by the flow of the sealant supplied to the upper end, can be sufficiently completed in a short time.

[0008]

Therefore, the sealing means of the joint can be repaired by the characteristic means of the present invention while the fluid transportation is continued and the fluid leakage is sufficiently suppressed, and a relatively simple tool is used. Work could be carried out quickly and satisfactorily, and a suitable joint repair method could be established especially in a high-pressure or large-diameter fluid transportation system.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. The joint 2 to be repaired includes a main body 2a, a pair of seal rings 2b, a pair of press rings 2c, as shown in FIG.
The seal ring 2b is formed by a pair of bolts and nuts 2d for applying a tightening force in the approaching direction to the pressing ring 2c, and is pressed into a pair of narrowed annular grooves formed between the fluid transport pipe P such as a gas pipe and the main body 2a. The fluid transport pipe P and the main body 2a are connected in a sealed state by being pushed in by the ring 2c. Here, the boundary portion of the inner surface side of the fluid transport pipe P and the main body 2a over the entire circumference of the pipe becomes seal portions A and B, and the upper end portions of the seal portions A and B are A1 and B1, respectively. The parts are indicated by A2 and B2, respectively. FIG. 1 shows a state in which a plug 7 for sealing the joint 2 is attached after the sealant 5 is supplied to the seal portions A and B.

Next, a repair procedure will be described. (1) As shown in FIG. 2, with the fluid transport by the fluid transport pipe P continued, the work equipment mounting base 1 with the shutter 1 a is attached to the upper part of the joint 2. And the mounting table 1
The drill 3a of the drilling machine 3 mounted on the fitting 2 is inserted from the passage 1b of the mounting base 1 with the shutter 1a opened, and the joint 2 is drilled by the drill 3a in a state where the mounting base 1 and the drilling machine 3 suppress fluid ejection. .

(2) After pulling out the drill 3a from the mounting table 1, after closing the shutter 1a, as shown in FIG.
Instead of the drilling machine 3, the sealant injection device 4 is mounted on the mounting table 1.
Attach to Here, the injection device 4 has a sealing agent discharge pipe 4d connected to the sealing agent pressurizing and supplying device 4c inserted into the case 4a detachable from the mounting base 1 in a detachable and airtight manner. And the discharge pipe 4d is connected to the joint 2
It is configured to be able to descend to the lower bottom.

The structure of the discharge pipe 4d will be described with reference to FIGS. 7 and 8. The distance between the upper ends A1 and B1 and the lower ends A2 and B2 of the seal portions A and B in the longitudinal direction of the closed pipe is described. Discharge holes N1 and N2 for dispensing the sealant are distributed and arranged in advance at two locations separated by a distance substantially equivalent to the above. Each of the discharge holes N1 and N2 has three holes facing the seal portion A and forming a 45-degree direction with each other, and the three holes are located at positions rotated by 180 degrees and the seal portion B side is positioned at a position rotated by 180 degrees. Each of the six holes is formed by combining three holes forming a 45-degree direction with respect to each other (a total of 12 holes in the upper and lower directions). The discharge direction of the upper discharge hole N1 is set so as to fall within a range of 15 degrees downward from the horizontal direction, and the discharge direction of the lower discharge hole N2 is set so as to fall within a range of 15 degrees above the horizontal direction.

(3) As shown in FIG. 4, the shutter 1a
Is opened, and a discharge pipe 4d is inserted into the joint 2 from the passage 1b in a state where the fluid ejection is suppressed by the mounting table 1 and the injection device 4, and the discharge holes N1 and N2 are formed at the upper ends of the seal portions A and B, respectively. Positioning is performed in the vertical and circumferential directions so as to face A1, B1 and lower ends A2, B2. Then, a sealant 5 is applied from the discharge holes N1 and N2 toward the seal portions A and B.
Inject. At this time, a part of the sealant 5 injected into the upper end portions A1 and B1 by the discharge holes N1 is supplied to the entire periphery of the seal portions A and B by the flow of its own weight while the lower end portion A
2, B2, and the lower end A
2, the lower end A together with the sealing agent 5 injected into B2.
2. Supply the sealant 5 in B2 to a sufficient amount. or,
The sealant 5 supplied to the seal portions A and B is pressed into the gap between the seal portions A and B by fluid pressure from inside.

The sealant 5 is made of an organic material such as thermoplastic, thermosetting, room temperature curable, moisture curable, two-component reactive resin, or an inorganic material such as water glass or cement. Select as appropriate.

(4) As shown in FIG. 5, after the discharge pipe 4d is pulled out from the mounting table 1, the shutter 1a is closed, and the plug mounting machine 6 is mounted on the mounting table 1 in place of the injection device 4.

(5) As shown in FIG. 6, the shutter 1a
Is opened, and the plug 7 is attached to the lower end of the arm 6a of the plug mounting machine 6 in a state where the fluid ejection is suppressed by the mounting base 1 and the plug mounting machine 6, whereby the peripheral portion of the hole of the joint 2 is threaded. The hole is closed with a plug 7. Then, after lifting only the arm 6a upward, the shutter 1a is closed, and finally, the mounting base 1 and the plug mounting machine 6 are removed from the joint 2.

[Other Embodiments] The configuration of the discharge holes N1 and N2 for discharging the sealant is different from that described in the above embodiment in the number of holes, the size of the holes, and the angle facing the seal portion (vertical direction). And the circumferential direction) can be appropriately changed. For example, the number and size of the discharge holes N1 facing the upper ends A1 and B1 of the seal portions A and B are larger or larger than those of the discharge holes N2 facing the lower ends A2 and B2. , B1 can be increased.

Further, the shape of the discharge pipe 4d is not limited to the linear shape described in the above embodiment. For example, as shown in FIG.
The pipe may be bent in the longitudinal direction, and the discharge holes N1 and N2 for discharging the sealant may be provided on one side in the pipe circumferential direction. In this case, first, the sealant 5 is spray-supplied toward the seal portion A on one side, and then the discharge pipe 4d is rotated by 180 degrees in the circumferential direction, and then spray-supplied to the seal portion B on the opposite side. Thus, the sealant 5 can be more accurately supplied from a position closer to the seal portions A and B.

The specific structure of the mounting table 1, the drilling machine 3, the injection device 4, and the plug mounting machine 6 may be any as long as a desired operation can be performed in a state where fluid ejection is suppressed. It can be changed appropriately.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of a joint portion.

FIG. 2 is a conceptual diagram of a construction procedure, part 1

FIG. 3

FIG. 4

FIG. 5

FIG. 6

FIG. 7 is a front view of a discharge pipe for discharging a sealant.

FIG. 8 is a sectional plan view of the same.

FIG. 9 is a conceptual diagram showing another embodiment of a discharge pipe for discharging a sealant.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Working device mounting base 1a Shutter 1b Passage 2 Joint 3 Drilling machine 3a Drill 4 Injection device 4d Sealing agent discharge pipe 5 Sealing agent 6 Plug mounting machine A, B Sealing part A1, B1 Upper end part A2, B2 Lower end part N1, N2 discharge hole

Claims (1)

(57) [Claims] 1. A joint repair method for injecting a liquid sealant (5) into seals (A) and (B) of a joint (2), wherein the joint (2) has a shutter (1a). The work equipment mounting base (1) is mounted, and the drill (3a) of the drilling machine (3) mounted on the mounting base (1) is moved to the shutter (1).
a) is inserted from the passage (1b) of the opened mounting base (1), and the joint (1) is inserted by the drill (3a) in a state where the fluid is prevented from being ejected by the mounting base (1) and the drilling machine (3). After the drill (3a) is pulled out from the mounting table (1), the shutter (1a) is closed, and the discharge pipe (4) for the sealant is used instead of the punch (3).
d) equipped with an injection device (4) on the mounting table (1), and the upper end portion (A) of the sealing portion (A), (B) in the longitudinal direction of the discharge pipe for sealing agent (4d). Discharge holes (N1) and (N2) for discharging the sealant are provided at two places separated by a distance substantially equal to the distance between A1) and (B1) and the lower ends (A2) and (B2).
Are distributed and arranged in advance, and the shutter (1
a) is opened and the discharge pipe (4d) for the sealing agent of the injection device (4) is removed from the passage (1b) through the passage (1b) in a state where the fluid ejection is suppressed by the mounting base (1) and the injection device (4). The discharge holes (N1) and (N2) are inserted into the joint (2).
Of the joint (2) from the discharge holes (N1) and (N2), so that the discharge direction of the joint (2) is directed to the upper end portions (A1) and (B1) and the lower end portions (A2) and (B2) at the same time. The sealant (5) is supplied from inside to the seal portions (A) and (B), and the sealant (5) is supplied by fluid pressure to the joint (2).
After the discharge pipe (4d) is pulled out from the mounting table (1), the shutter (1a) is closed, and the injection pipe (4) is inserted into the injection device (4). Alternatively, the plug mounting machine (6) is mounted on the mounting base (1), the shutter (1a) is opened, and the fluid is prevented from being ejected by the mounting base (1) and the plug mounting machine (6). A method of repairing a joint part in which a hole of the joint (2) is closed by a plug mounting machine (6) and the mounting base (1) and the plug mounting machine (6) are removed.