JPH05172292A - Repair device for resin piping - Google Patents

Abstract

PURPOSE:To obviate a jig dedicated solely to shutting pipeline by providing a cutter for push-cutting a resin piping at a casing into which the piping is fitted removably in the sealed condition, and shutting the pipeline with the cutter and casing when the piping is to be cut. CONSTITUTION:At repair works for a resin piping 1, it is fitted in a casing 2 at upstream and downstream of a pipe position to be repaired, and a lever 5 is turned to slide a push cutter 4 downward, and thereby the resin piping 1 is push cut. Therein the pipeline is shut at the shutting part formed from the push cutter 4 and casig 2, and a bypass is formed through which the gas flow path is in communication with a bypass pipe 7 through a connection part R. An inserting/removing tool 10 is turned, and the cut portion of old pipe 1A is taken out, and then the tool 10 is turned oppositely for insertion of a new pipe and fusion attached by heat to the connecting end face of the existing pipe through a pipe fitting including heater element mounted at the tip of the new pipe.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a repair apparatus for resin pipes used for cutting pipes and shutting off pipelines when repairing resin pipes.

[0002]

2. Description of the Related Art A repair device suitable for performing pipe cutting and pipe line disconnection when performing repair work on resin pipes has not been developed. Therefore, when performing the repair work, by performing a squeeze-off on the resin pipe near the upstream side of the repair place, or by closing a valve provided in advance near the upstream side of the repair place, After the pipeline was blocked, the resin pipe was cut downstream of the blocked portion, and repair work such as old and new replacement of the resin pipe was performed. During the repair work, when it is necessary to bypass the fluid flowing through the resin pipe, a dedicated joint configured to connect the bypass pipe is separately attached to the resin pipe, and the dedicated joint is used. Then, the bypass passage is formed by connecting the bypass pipe in communication with the downstream pipe passage.

[0003]

When the squeeze-off is performed near the repaired area, a dedicated jig for the squeeze-off work and its installation space are required, and the resin pipe has a large diameter. In this case, there was a problem in executing the pipeline cutoff, that is, sufficient squeeze-off could not be performed and the amount of gas passing through became large. Further, while every portion of the resin pipe can be the repaired portion, it is practically impossible to provide the valve at every portion of the resin pipe, and therefore the pipe line disconnection using the valve is always possible. There was a problem in blocking the pipeline, which is not always possible (in many cases, it cannot be done). In addition, when the bypass is required during the repair work, using a dedicated joint that can freely connect the bypass pipe requires that the dedicated joint be prepared separately, and the connecting work is troublesome. However, there was a problem in forming a bypass because of poor workability. The present invention has been made in view of the above circumstances, and it is a first object of the present invention to provide means for solving all of the above-mentioned various problems in blocking the pipeline. Further, it is a second object to provide means for solving the problem in forming the bypass passage.

[0004]

A resin pipe repairing apparatus according to the present invention is provided with a casing into which a resin pipe can be inserted and removed in a sealed state, and the resin pipe fitted inside the casing is pushed and cut. A push-cut cutter for cutting is attached to the casing slidably in the radial direction of the resin pipe, and a cut-off portion that cuts off the resin pipe by the push-cut cutter and the casing that cut and cut the resin pipe is provided. The fact that it is configured is the first characteristic configuration.

Further, a connecting portion for the bypass pipe is provided in the casing, and a gas passage for guiding gas from the resin pipe pushed and cut by the pushing cutter is provided in the pushing cutter to connect the connecting portion and the gas passage. The second characteristic configuration is that the two are communicated with each other.

[0006]

According to the first characteristic configuration, in the state where the push-cutting cutter pushes and cuts the resin pipe, the cutoff portion automatically cuts off the pipe line of the resin pipe. Therefore, it is not necessary to prepare a special jig for shutting off the power. Further, even if the resin pipe has a large diameter, the shutoff portion sufficiently shuts off the pipeline as long as the push-cutting can be performed, and the passing gas can be suppressed. Moreover, the shutoff of the pipeline can be performed even in a place where the valve is not provided in the vicinity.

According to the second characteristic configuration, the following action occurs in addition to the above-described action. That is, in a state in which the resin pipe is cut and cut by the push-cutting cutter, the gas passage and the bypass pipe are communicated with each other through the connecting portion, and a bypass passage is naturally formed. Therefore, it is not necessary to separately prepare a dedicated joint that was conventionally required to form the bypass passage, and the laborious connection work using the dedicated joint is not necessary and the workability is improved. Become so.

[0008]

According to the first characteristic configuration, it is not necessary to prepare the dedicated jig and secure the installation space for the dedicated jig, and it is possible to sufficiently cut the pipeline even for a resin pipe having a large diameter. In addition, since it becomes possible to execute the pipeline cutoff regardless of the installation state of the valve, various problems in blocking the pipeline can be solved at once.
Therefore, the first object of the present invention is achieved.

According to the second characteristic configuration, in addition to the above-mentioned effects, preparation of the dedicated joint and troublesome connection work using it are not required, and workability is improved, so that the bypass passage is formed. Therefore, the problem in doing so can be solved, and thus the second object of the present invention can be achieved.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show an embodiment of a resin pipe repairing device according to the present invention (hereinafter, simply referred to as the device of the present invention). FIG. 1 is a front view showing the entire structure, and FIG. A side view thereof, FIG. 3 is a cross-sectional view taken along the line EE in FIG. 1, and FIG. 4 is a side view showing a tip portion of the push-cut cutter.

Reference numeral 1 in the figure denotes a resin pipe (hereinafter simply referred to as a pipe 1) in which, for example, a gas pipe made of a thermoplastic resin is provided for gas supply, and a repair required portion of the pipe 1 (for example, Upstream and downstream of the damaged portion of the pipe 1), for repair work, the pipe 1 is cut, the pipeline is cut off, and the upstream and downstream portions of the repaired portion of the pipe 1 are joined together. The device of the present invention is used to form a bypass passage using the bypass pipe 7.

The device of the present invention has the tube 1 as its main body.
Is provided with a tubular casing 2 which can be inserted and removed in a sealed state. The casing 2 has an inner peripheral surface corresponding to the outer peripheral surface of the pipe 1, and the pipe 1 is inserted (in other words, the casing 1 is externally fitted to the pipe 1). It is designed to be applied to the outer peripheral surface. The casing 2 is divided into three parts, a left side portion 2A, a central portion 2B, and a right side portion 2C.

Three parts 2A, 2B, 2 of the casing 2
While the lower halves of C are integrally connected, the upper halves of them can be opened and closed with one end as a pivotal support as shown in FIG. It can be opened and closed). The state in which the upper half of the three parts 2A, 2B, 2C is closed and the pipe 1 is clamped is maintained by fastening each end of the closed upper half with the fastener 6. It has become. It should be noted that the seal between the pipe 1 and the casing 2 is a left side portion 2A of the casing 2 as shown in FIG.
And an O-ring 3 which is disposed on the inner peripheral portion of the right side portion 2C and is fitted inside the inner peripheral portion of the casing 2 to be in close contact with the pipe 1.

The casing 2 has the casing 2
A push-cutting cutter 4 for pushing-cutting and cutting the pipe 1 fitted inside (the push-cutting cutter 4 is divided into a cutting edge portion 4a, a base lower portion 4b, and a base upper portion 4c) is arranged in a radial direction of the pipe 1. It is slidably attached. As shown in FIG. 1, the upper part of the central portion 2B of the casing 2 has an upper protruding portion 2a capable of accommodating the blade tip portion 4a and the base lower portion 4b of the push-cutting cutter 4 in the pre-cutting posture with a margin.
Are formed.

A through hole 2b is formed in the ceiling portion of the upper protruding portion 2a as shown in FIG. 1, and a guide groove for slidingly guiding the push-cutting cutter 4 as shown in FIG. 3 is formed inside the front and rear side wall portions thereof. 2c is formed. Then, in the through hole 2b, the base upper portion 4c of the push-cutting cutter 4 is formed.
Is inserted in a sealed state and is vertically slidable, and the guide groove 2c is slidably engaged with the front edge portion and the rear edge portion of the blade tip portion 4a of the push-cutting cutter 4 and the base lower portion 4b. By the engagement, the vertical slide guide of the push-cutting cutter 4 is performed.

The upper part 4 of the base of the push-cutting cutter 4
The upper end of c is driven up and down by the operation of the operating lever 5, and based on this operation, the base upper portion 4c of the push-cutting cutter 4 is moved downward so that the blade edge portion 4a of the push-cutting cutter 4 is moved to the above-mentioned position. When the lower end portion of the pipe 1 is pushed in, the pipe 1 is pushed and cut. A lower protruding portion 2d is formed in the lower portion of the central portion 2B of the casing 2 in order to secure a space for accommodating the blade tip portion 4a of the push-cutting cutter 4 which is pushed to the lower end portion of the pipe 1. ..

The pipe 1 is cut and cut by the push-cutting cutter 4 as described above. The push-cutting cutter 4 and the casing 2 in the cutting state form a cutoff portion for cutting the pipe line of the pipe 1. It is supposed to be done. That is, the push-cutting cutter 4 in the state in which the cutting is performed
Is configured so that the pipe path of the pipe 1 is blocked by the blade tip portion 4a and the base body lower portion 4b which are engaged with the guide groove 2c of the casing 2 (central portion 2B) in a sealed state.

A connecting portion 8 (specifically, a joint 8) for the bypass pipe 7 is provided on the upper protruding portion 2a of the casing 2 (central portion 2B). Further, on the left side portion of the push-cutting cutter 4, a vertically elongated groove 4d is formed as a gas flow passage F for guiding the gas from the inside of the duct of the pipe 1 which has been pushed and cut by the push-cutting cutter 4. And
The connecting portion 8 and the vertically elongated groove 4d as the gas flow passage F are set to be in communication with each other at least when the push-cutting cutter 4 pushes the pipe 1 completely.
Thus, since the gas flow passage F and the bypass pipe 7 are communicated with each other via the connecting portion 8, the bypass passage can be formed between the upstream side and the downstream side of the repaired portion of the pipe 1.

A gas cock 9 for measuring gas pressure or for purging is also provided on the upper protruding portion 2a of the casing 2 (central portion 2B) provided with the connecting portion 8, and the gas cock 9 is The gas cocks 9 are installed at two locations so that the respective gas cocks 9 are in communication with the upstream side or the downstream side when the push-cutting cutter 4 pushes down the pipe 1.

At the right side portion 2C of the casing 2, a pipe 1 (hereinafter referred to as an old pipe 1A) that is cut and separated by the push-cutting cutter 4 is pulled out, and the old pipe 1A.
An insertion / removal tool 10 for inserting a tube 1 (hereinafter referred to as a new tube 1B) to be replaced is attached.

When the pipe 1 (a pipe made of a thermoplastic resin) is repaired using the apparatus of the present invention having such a structure, first, as shown in FIG. 1, at the upstream side and the downstream side of the repaired portion of the pipe 1. After the pipe 1 is fitted into the casing 2 (in other words, after the casing 2 is fitted onto the pipe 1), the push cutter 4 is moved through the state shown in FIG. The resin pipe 1 is pushed down and cut by sliding downward until the state shown in FIG. In the cut state (including the state immediately before the cut), the pipe path of the pipe 1 is cut off by the cutoff portion constituted by the push-cutting cutter 4 and the casing 2 in that state, and the gas flow path F is formed. The bypass pipe 7 is communicated with the bypass pipe 7 through the connecting portion 8 to form a bypass passage. Then, by operating the insertion / removal tool 10, the old pipe 1 cut as described above.
After removing A, the insertion / removal tool 10 is operated in the opposite direction to insert the new pipe 1B to be replaced with the old pipe 1A as shown in FIG. It should be noted that one end side of the pipe joint 11 containing an electric heating element is previously attached to the tip portion of the new pipe 1B. The electric-heater-equipped pipe joint 11 is specifically provided with fitting portions on both sides for fitting the thermoplastic resin pipes 1 (old pipe 1A and new pipe 1B) in a sealed state, and is made of a thermoplastic resin. An electric heating body 11a that generates Joule heat for fusion bonding the joint body and the connected portion of the pipe 1 to the inner peripheral portion of the joint body configured as described above.
Are embedded. And
As shown in FIG. 8, the new pipe 1B is further inserted, and the other end side of the electric-heater-equipped pipe joint 11 remains after the completion of cutting and removal of the old pipe 1A (the usable old pipe 1
The end of A) is fitted internally. After that, the electric heating element 11a is energized to complete the pipe connection by the electric heating element-containing pipe joint 11. Similarly, the pipe connection is completed on the other end side of the new pipe 1B. Then, the push-cutting cutter 4 of one of the present invention devices is raised to introduce gas into the new pipe 1B, the gas cock 9 of the other present invention device is opened, and the longitudinal grooves 4e of the push-cutting cutter 4 and the flow paths of the gas cock 9 are opened. Then, the air in the new pipe 1B is purged with gas. When the electric heating element 11a is energized, the device of the present invention is kept in a state where it does not interfere with the energizing work. For example, three parts 2A of the casing 2,
Leave the upper half of 2B and 2C open. In the process of connecting the pipe, the gas cock 9 provided on the upper protruding portion 2a of the casing 2 (central portion 2B) can be used to measure the pressure in the pipe and perform the purging.

Next, another embodiment will be described. The gas flow path F may be something other than the vertically elongated groove 4d formed in the open state on the left surface portion of the push cutter 4 as in the above-described embodiment. For example, it may be a latent hole vertically formed in the push-cutting cutter 4. In addition, the new pipe 1B
As a joint that connects the usable old pipe 1A and the usable old pipe 1A, joints other than the electric heating element-containing pipe joint 11 (for example, both ends are internally fitted to the connected portions of both pipes 1A and 1B to be connected) A known seal joint in which the inner fitting portion is connected in a sealed state may be used.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a front view showing the overall configuration of the device of the present invention.

[Figure 2] Side view

FIG. 3 is a sectional view taken along the line EE in FIG.

FIG. 4 is a side view showing the tip of the cutter together with a pipe.

FIG. 5 is an explanatory view showing a usage state of the device of the present invention.

FIG. 6 is an explanatory view showing a usage state of the device of the present invention.

FIG. 7 is an explanatory view showing a usage state of the device of the present invention.

FIG. 8 is an explanatory view showing a usage state of the device of the present invention.

[Explanation of symbols]

 1 Resin pipe 2 Casing 4 Push-off cutter 7 Bypass pipe 8 Connection part F Gas flow path

[Procedure amendment]

[Submission date] January 21, 1992

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 5]

[Figure 6]

[Figure 7]

[Figure 8]

Claims (2)

[Claims] 1. A casing (2) in which a resin pipe (1) is insertably and removably fitted in a sealed state is provided, and the resin pipe (1) fitted in the casing (2) is pushed and cut. The push-cutting cutter (4) is attached to the casing (2) slidably in the radial direction of the resin pipe (1), and the push-cutting cutter (4) and the casing (2) in a state where the resin pipe (1) is pushed and cut. ) And a resin pipe repairing device in which a blocking portion for blocking the conduit of the resin pipe (1) is configured by 2. Connection (8) to the bypass pipe (7).
Is provided in the casing (2), and the resin pipe (1) is pressed and cut by the pressing cutter (4).
A gas flow path (F) for guiding gas from is provided in the press cutter (4), and the connecting portion (8) and the gas flow path (F) are provided.
The resin pipe repairing device according to claim 1, wherein the repairing device and the resin pipe are communicating with each other.