JP3109739B2 - Pipe inner surface repair joint - Google Patents

Description

[Description of the Invention] [Object of the Invention] The present invention relates to a pipe inner surface repair joint, which is capable of performing simple, stable and accurate repair from the inner surface of a pipe when leakage occurs from a pipe joint or the like. It is intended to provide a joint.

(Industrial application field) A joint that repairs leakage from the inner surface of the pipe, such as a pipe joint, using a flange method, a welding method, or various other expansion joint methods.

(Prior art) Repair of leakage at a pipe joint or the like has conventionally been performed in various ways, but such pipes are generally buried underground. It is common practice to excavate the soil to expose the faulty part, and to fix and repair by attaching a repair material from the outer surface of the pipeline.

In the case of a large-diameter pipe, an operator enters the pipe, attaches a rubber or other sealing material to the leaked portion, arranges a holding band, and tightly fixes with a bolt.

(Problems to be Solved by the Invention) The above-described method of digging a leaked part of a buried pipe as a general method has a remarkably large number of steps, and cannot avoid high cost. In particular, in the case of large pipes, it is necessary to completely excavate the outer periphery of the repaired part, and for the underside of the underground pipe, it is necessary to dig deep enough for the operator to enter and work. It becomes remarkably large.

In general, it cannot be adopted when there are buildings and structures on the ground.

On the other hand, the work performed from the inside of the pipe described above is performed by inserting a bolt into a tightening seat formed by folding the end of the band and tightening it, and fixing the sealing material by expanding the band. Is large.

In addition, both the fastening seat and the bolt, which are folded up at the end of the band, protrude from the inner surface of the tube, and such a protrusion on the inner surface of the tube greatly obstructs the flow of fluid.

Also, since it is intended to provide a sufficient tightening force in the tightening seat and to tighten the seal material, the band needs a certain thickness, and the weight must be large including the bolt, Inevitably, the workability is inferior.

In performing the repair from the inner surface of the tube as described above, it is indispensable to fix and fix a flexible sealing material such as a rubber ring on the inner surface of the tube. There is a disadvantage that it is not easy to stably and accurately fix the inner surface of the pipe in a smooth state, so that the repair effect cannot be effectively obtained.

"Constitution of the Invention" (Means for Solving the Problems) The present invention has been conceived in order to solve the problems in the above-described conventional device, and has been relatively simple and protruded into the pipe. The band has been successfully tightened or disengaged with a band that requires less work, and is as follows.

A sealing material such as a rubber ring is attached to the inner surface between the ends of the pipes to be connected, and a pressing band is attached to the inner surface of the sealing material for sealing. An auxiliary plate having a U-shaped cross section is interposed at the end receiving position, and a stopping claw and a locking step are provided opposite to each other in the width direction at the opposite joining end of the presser band, and A pipe inner surface repair joint characterized in that a spacer is interposed at an intermediate portion in a width direction of a holding band between joining ends.

(Operation) A seal member such as a rubber ring is attached to the inner surface between the ends of the pipes to be connected, and a press band is attached to the inner surface of the seal member to seal. An auxiliary plate with a U-shaped cross section is interposed at the receiving position of the joint end of the band, so that the presser band can be stably and accurately received in a seal material such as a rubber ring, and the seal material and the presser band are effectively integrated. A simplified setting and mounting are achieved, and a stable and accurate mounting is performed on the pipe to be connected.

In addition, a restraining claw portion and a locking step which are mutually joined and locked in the width direction are provided opposite to the joined end portions of the holding band as described above, and a middle portion in the width direction of the holding band between the joined ends. By interposing the spacers, the ends of the holding band can be stably and accurately engaged with each other, accurately positioned in the width direction of the holding band, and combined with the auxiliary plate having the U-shaped cross section. As a result, a connection state that is appropriately connected and integrated with the sealing material such as a rubber ring in the length direction is formed.

(Example) A specific embodiment of the present invention will be described. In the present invention, as shown in FIGS. 1 and 2, a belt-like rubber ring 1 Is attached as a sealing material. The sealing material 1 such as a rubber ring is preferably connected endlessly. In some cases, the end portions of the band-shaped material may be formed with inclined ends that are joined to each other. Although the joint according to the present invention is shown and described with reference to the joint part because leakage often occurs at the joint part, it is needless to say that the present invention can also be applied to the case where leakage occurs at the middle part of the pipe 10. .

The band 2 for holding the sealing material 1 attached to the inner surface of the pipe 10 as described above is a key feature according to the present invention. In addition, as shown in FIG. 5, on one side of the opposing ends 2a, 2a of the band 2, claws 3 for suppressing joining are provided on the inner surface of the opposing band so as to face each other, and the operating cylinder 4 as shown in FIG. Locking parts 5, 5 for the cylinder 4a and the piston 4b are formed. The locking portion 5 may be protruded from the inner surface of the band 2, but it is sufficient that the locking portion 5 is perforated as shown in the figure, and the man-hour for forming the locking portion 5 is small. Less protruding into the inner surface of

The sealing material 1 as described above is
As shown in the figure, a joining projection 12 is formed at an appropriate interval on the joining surface with respect to the pipe 10, and a concave portion 13 is formed between the joining projections 12. Proper sealing by the projection 12 is achieved.

Further, in the present invention, the joining ends 2b, 2b for interposing the spacer 6 between the depressing claws 3, 3, as described above, are appropriately formed from the same edge or the ends 2a, 2a as the ends 2a, 2a. The spacer 6 is interposed between these joint ends 2b, 2b. The spacer 6 preferably has a trapezoidal cross section as shown in FIG.
When interposed between 2b and 2b, the bottom surface of the spacer 6 is pressed against the surface of the sealing material 1 as shown in FIG. Form a state. However, the spacer 6 may be formed with a concave portion for receiving the joining ends 2b, 2b in a drum shape on both end surfaces. The band 2 is a sealing material 1
Are provided on both sides of the ridge 11 respectively, but if the sealing material is wider, three or more may be provided side by side.
When the tube 10 has a relatively small diameter, the band 2 may have one of the above-described restraining claws 3 and 3 at both ends of the single tube. However, when the tube 10 has a relatively large diameter, The use of two or more bands in the circumferential direction of the pipe 10 facilitates the loading of the band 2 into the pipe,
The spacer 6 as shown in FIG.
In addition, it is preferable that the fixing and fixing by the detent pawl portions 3 and 3 be performed. In this case, the tightening and fixing by the operation cylinder 4 as shown in FIG. A stable setting can be obtained by performing only one or two.

In performing the actual repair, an adhesive seal such as butyl rubber can be applied to the groove portion of the seal material 1 as shown in FIG. 1 or FIG. 3, and the band 2 is made of rubber or the like. By applying a lubricant (for example, silicone grease) to a surface to be joined to the certain sealing material 1, the band can be smoothly pressed and crimped by the operation cylinder 4.

In the case of the operating cylinder 4, as shown in FIG. 5, when the locking portion 5 is in the form of a hole, as shown in FIG. By providing the projections 14 and 14 to be inserted into the portion 5, the operation can be facilitated. By using a hydraulic or other hydraulic or pneumatic pressure as the operating cylinder 4, it is obvious that the band 2 can be given an appropriate expanded state in one touch by operating a valve or a cock in any case. The mounting and dismounting operation is also simple.

It is preferable that an auxiliary plate 7 as shown in FIG. 6 is appropriately used between the sealing member 1 and the connecting portion of the band 2 as described above. The ridge 11 can be formed to set the band 2 in an appropriate engagement setting position. Further, as shown in FIG. 6, the washer 8 can be attached to the spacer 6 side of the detent claw 3 to suppress the spacer. In this case, even if a simple rectangular body is used as the spacer 6, the detent claw is used. 3 can be stably set, and the setting tightening of the presser band 2 can be smoothly performed.

[Effect of the Invention] According to the present invention as described above, the band can be easily and accurately expanded using the operation cylinder and the seal material can be stably set, so that the repair work can be remarkably facilitated, and By forming a stable repair joint in which a sealing material such as a rubber ring and a rigid holding band are effectively and appropriately connected and integrated, the flow of the fluid in the pipe is hardly affected. The present invention has a function and an effect that the existing joint is an expandable and contractible joint that hardly impairs the performance thereof, and is an invention having a large industrial effect.

[Brief description of the drawings]

The drawings show the technical contents of the present invention. FIG. 1 is a sectional view taken along a pipe axis direction showing a setting state of a repair joint according to the present invention, and FIG. 2 is a direction perpendicular to the pipe axis direction. , FIG. 3 is a partial slope view showing the disassembled state and connected state of the band end, FIG. 4 is a partial sectional view of a sealing material crimped state by a spacer, and FIG. FIG. 6 is a perspective view of a state in which the operating cylinder is in the expanding operation state, and FIG. 6 is a partial exploded view showing a modification of the inhibiting claw portion and the spacer portion in the same manner as FIG. . However, in these drawings, 1 is a sealing material, 2 is a holding band, 2a is its end, 2b is its joint end, 3 is a detent pawl, 4 is an operating cylinder, 4a is its cylinder, 4b is its piston, Is a locking portion, 6 is a spacer, 7 is an auxiliary plate, 8 is a washer, 10 is a tube, 11 is a ridge, 12 is a joining protrusion,
Reference numeral 13 denotes a concave portion, and 14 denotes a protrusion.

Claims (1)

(57) [Claims] 1. A sealing material such as a rubber ring is attached to an inner surface between end portions of a pipe to be connected, and a pressing band is attached to an inner surface of the sealing material to perform sealing. A supporting plate having a U-shaped cross section is interposed at the joint end receiving position of the presser band, and a restraining claw portion and an engaging step which are mutually connected and locked in the width direction at the opposing joint end of the presser band. An inner surface repair joint for a pipe, wherein a spacer is interposed in a widthwise intermediate portion of the holding band between the joining ends.