JP7149523B2 - Branch pipe removal method and removal tool. - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for removing a branch pipe that is mainly formed when an uninterrupted water supply construction method is employed, and a removal tool used in the method.

In the replacement work of existing water pipes, a branch pipe is installed to form a bypass in order to maintain the state of uninterrupted water without stopping the water upstream so as not to cause inconvenience to water users. A branch pipe will also be constructed for temporary water supply. Such a branch pipe is constructed by connecting a sluice valve mechanism to a pipe branch port formed integrally with the main pipe, and connecting the branch pipe to the sluice valve mechanism.

When the branch pipe becomes unnecessary, the branch pipe is removed, but if the sluice valve mechanism is left, the part will protrude from the water pipe, which will interfere with excavation work in the future. , the gate valve mechanism must also be removed.

Therefore, as a sealing means for the pipe branch port, a mating flange that can be placed in a watertight state outside the flow path of the gate valve with the gate valve closed is adopted. The body (insertion jig in Patent Document 1, operation shaft in Patent Document 2) is inserted and connected to the sluice valve mechanism, the sluice valve body is opened, the plug body is inserted into the pipe branching portion, and attached to the pipe branching portion. After that, the sealing member is separated from the insert body, the mating flange, and the gate valve mechanism are removed.

In addition, in the connection between the sealing member and the pipe branching port of Patent Document 1, an engaging projection having a passage portion (notch portion) partially cut out on the inner peripheral surface of the pipe branching port is provided, and the sealing member is provided with a base (pipe A sealing portion is provided on the outside of the channel), and an overhanging portion that can pass through the notch is provided at the tip portion. direction).

In addition, the connection between the sealing member and the pipe branching port of Patent Document 2 is formed in an engagement wall provided with a bayonet groove having a passing portion provided on the inner peripheral surface (peripheral wall surface) of the pipe branching port, and the sealing member is connected to the tip (pipe line A sealing part is provided on the inner side), and a protrusion that can pass through the passage part is provided on the base side, and the sealing body is inserted into the pipe branch opening and the passage part is positioned in the bayonet groove. be.

Japanese Patent Application Laid-Open No. 2009-168163. Japanese Patent Application Laid-Open No. 2010-117029.

In order to attach a sealing member having a sealing function to a pipe branch opening in an uninterrupted water supply state, it is necessary to consider the water pressure from the water main pipe that the sealing member receives.

As a countermeasure disclosed in Patent Document 1, a jack is interposed between the core shaft for rotating the sealing member and the main pipe for press-inserting the sealing member into the pipe branching port. A double-shaft configuration of the connecting outer shafts is adopted, and a jacking force is applied via the outer shafts to achieve press-insertion of the hermetic plug provided with the sealing portion.

In addition, the means disclosed in Patent Document 2 does not employ a jack, and incorporates the configuration of the sealing portion of the sealing member into a small inner diameter of the pipe branch opening, thereby allowing the sealing member to be connected to the pipe without being subjected to water pressure resistance. After inserting it into the branch and attaching it, the seal is pressed by the tip member of the hermetic plug to bulge in the outer peripheral direction and exhibit the sealing function. The shaft is used as a rotation operation shaft for attaching the sealing member, and the inner shaft is used as a rotation operation shaft for screwing rotation of the tip end member.

In this way, a double-shaft structure is adopted for mounting the conventional sealing body in order to cope with the water pressure from the water main pipe. For this reason, in addition to the watertight structure of the mating flange and the insert, a watertight structure of inner and outer double shafts is also required, which inevitably complicates the structure. In addition, the structure for attaching the jack and the structure of the sealing member become complicated, and there is a problem that the structure of the equipment to be used becomes complicated.

Accordingly, the present invention proposes a novel method and device for sealing a pipe branch opening by simplifying the equipment used.

A branch pipe removing method according to claim 1 of the present invention is a branch pipe in which a branch pipe is connected to a pipe branch port branched from a main pipe via a gate valve mechanism. A thread protruding inward from the peripheral wall surface on the side is formed, and after separating the branch pipe with the sluice valve mechanism closed, a threaded portion for screwing the tip to the thread is formed. The insert is attached to the hermetic plug provided with a sealing portion to be tightly inserted into the outer peripheral wall surface, and the hermetic plug is placed inside the lid container body mounted on the outside of the sluice valve mechanism so as to have a gap on the outer periphery . At the same time, the insert is protruded to the outside of the lid container body to prevent the movement of the sealing member and the insert body, and the lid container body integrated with the seal plug and the insert body is changed into a branch pipe and installed to supply water. In a sealed state, the sealing body is assembled outside the gate valve mechanism, the gate valve mechanism is opened, the movement prevention state of the sealing body and the insert is released, and the sealing body is advanced into the pipe branch port by the insertion body, and the sealing body is By screwing the sealing part of the plug into the outer peripheral wall surface to seal the pipe branching port, the lid container, the gate valve mechanism, and the insert are removed. .

A branch pipe removal tool according to claim 3 of the present invention connects a branch pipe to a pipe branch port branched from a main pipe via a gate valve mechanism, and has an outer side on the inner peripheral surface of the pipe branch port. A tool for removing a branch pipe in a branch pipe, which has a spiral thread protruding inward from the peripheral wall surface, and is composed of a sealing body, an insert body, and a lid container body, and the sealing body has a shape that serves as a sealing plug for the pipe branch opening. The insertion body has a screw portion formed on the front side thereof to be screwed into the screw thread, and a seal portion on the base side thereof to be tightly inserted into the outer peripheral wall surface when screwed with the screw thread. is provided on the upper surface of the hermetic plug so as to be rotatable and detachable, and an operating handle is provided on the base of the hermetic plug. The operating shaft protrudes outward in a water-sealed state , and the sealing member is incorporated inward so as to be attachable to the sluice valve mechanism . It is characterized in that it is provided with a holding mechanism .

Then, when the lid container body incorporating the seal plug and the insert is attached to the gate valve mechanism (valve closed state) from which the branch pipe is removed and the gate valve mechanism is opened, the seal plug advances into the pipe branch port. becomes possible. Therefore, the inserter is operated from the outside to push the sealing member to the position of the pipe branching opening. In this pushing operation, the water remaining below the sealing member moves upward through the outer peripheral gap of the sealing member. Since it does not join, it can be easily pushed in by human power. Then, when the screw portion of the sealing member reaches the thread position, the screwing operation is started by turning the sealing member by the inserting member, and when the sealing portion reaches the position of the outer peripheral wall during the screwing operation, the sealing member Although the water pressure of the main pipe is applied to the advance of the pipe, the screwing operation enables the advance of the sealing member against the water pressure. It is water-sealed with a hermetic plug. After that, each tool is removed.

In the method of removing the branch pipe of the present invention, the movement of the sealing member is prevented before the gate valve mechanism is opened, and the blocked state is released after the valve is opened in the blocked state. The removal tool for the branch pipe has an insertion body holding mechanism attached to the cover container body to prevent the movement of the sealing body incorporated inside. This prevents contact and damage to the sluice valve mechanism.

The configuration of the present invention is as described above, and employs a threaded structure for connecting a pipe branch opening in a branch pipe where the branch pipe is expected to be removed and a hermetic plug for sealing the pipe branch opening after removal of the branch pipe. This facilitates the advance of the sealing member into the pipe branching port, which is subject to water pressure resistance, and eliminates the need for a structure that pushes in the sealing member due to an external force due to a jacking force and a structure that bulges the sealing member. This realizes simplification of the tools for removing the branch pipe without adopting the

Explanatory drawing of the removal tool of this invention (1st embodiment). Process explanatory drawing of the same branch pipe removal work (removal of a branch pipe). The same figure (wearing of tools). The same figure (attachment of the hermetic plug). The same figure (removal of the handle and lid container body). The same figure (removal of the gate valve mechanism and the operation shaft). The same figure (finished state). Explanatory drawing of the insertion body holding mechanism of the second embodiment. Process explanatory drawing of the same branch pipe removal work (instrument installation state). Operation explanatory drawing of the insertion body holding mechanism.

Next, embodiments of the present invention will be described. The target pipeline for removal of the branch pipe shown as an embodiment is a saddle member 1 and a support member 2 that are divided into two so as to cover the outer peripheral surface of the water main A when the branch pipe B is provided in the water main A. is attached, and is clamped and fixed to the water main pipe A with an appropriate connecting bolt 3, the gate valve mechanism C is attached to the saddle member 1 provided with the pipe branch port 11, and the gate valve mechanism C is interposed to perform a known perforation A water passage hole a is drilled in the water main pipe A by installing the device, and after the completion of drilling, the drilling device is removed and the branch pipe B is connected to construct a branch pipeline. The saddle member 1, the gate valve mechanism C, and the branch pipe B are connected by flanges.

In particular, in the present invention, the inner peripheral surface of the pipe branch port 11 of the saddle member 1 is provided with an inwardly protruding screw thread 13 so that the diameter of the water main pipe A side is smaller than that of the outer peripheral wall surface 12 . It should be formed.

The branch tube removal tool of the present invention is composed of a sealing plug 4, an insert 5, a lid container 6, and a lid plate 7. As shown in FIG.

The sealing member 4 serves as a sealing plug for the pipe branching port 11. The sealing member 4 is formed as a threaded portion 41 to be screwed into the thread 13 at the front, and is a sealing member at the base for water-sealing with the outer peripheral wall surface. is provided with a seal portion 42 having a

In particular, the formation positions of the outer peripheral wall surface 12 , the thread 13 , the threaded portion 41 and the seal portion 42 are such that the seal portion 42 is formed on the outer peripheral wall surface 12 from the middle of the threaded portion 41 being screwed to the threaded portion 13 . It is like advancing into a space surrounded by. Also, a connecting portion (screw hole) 43 for connection with the insert 5 is provided on the upper surface.

The insert 5 is composed of an operation shaft 51 having an appropriate length, a sealing body connecting portion 52 and an operating handle 53. The sealing body connecting portion 52 is made up of a connecting plate 52a fixed to the tip of the operating shaft and connecting the connecting plate 52a to the sealing body 4. It consists of a fixing bolt 52b that is positioned on the upper surface of the screw hole 43 and screwed into the screw hole 43. As shown in FIG. The operating handle 53 is detachably connected to the proximal end of the operating shaft 51 and is used to operate the operating shaft 51 in the axial direction and rotate it.

The lid container body 6 has a body portion 61 having a space for storing the hermetic plug 4 whose bottom is open and whose top is closed. An O-ring 63 is mounted inside the guide tube portion 62 . Further, a handle 64 is protruded from the outer circumference of the upper portion of the body portion 61, and a flange 65 is provided around the lower edge.

Also, the cover plate 7 is a plate body that matches the shape of each flange.

Next, a procedure for removing the branch pipe B using the removal tool described above will be described. First, the sluice valve mechanism C is operated to close the valve, and the branch pipe B is separated (Fig. 2).

Next, the operation shaft 51 is connected to the hermetic plug 4, and the hermetic plug 4 is accommodated in the body portion 61. At the same time, the operating shaft 51 is protruded from the guide tube portion 62, and the operating handle 53 is attached to the protruding operating shaft 51. This assembled removal tool is attached to the flange of the gate valve mechanism C with a flange 65 (Fig. 3).

Next, the gate valve mechanism C is opened to allow the sealing member 4 to advance toward the pipe branching port 11 , and the sealing member 4 is pushed to the position of the pipe branching port 11 by the operation handle 53 . In this pushing operation, the water remaining below the sealing member 4 moves upward through the outer peripheral gap of the sealing member 4, and the water pressure acting as the pushing repulsive force corresponds to the small area of the cross section of the operating shaft. Since only 100% of force is applied, it can be easily pushed in by human power.

When the screw portion 41 of the sealing member 4 reaches the screw thread 13 , the operation handle 53 is rotated to screw the sealing member 4 onto the screw thread 13 . When the seal portion 42 reaches the position of the outer peripheral wall surface 12 during this screwing operation, the water pressure of the water main pipe A is applied to the advance of the sealing member 4, but the water pressure is resisted by the screwing operation. The sealing member 4 can be pushed forward as a whole, and the entire sealing member 4 is housed in the pipe branching port 11 to water-seal the pipe branching port 11 (FIG. 4).

After attaching the sealing member 4 to the pipe branching port 11, the operating handle 53 is removed from the operating shaft 51, and the lid container body 6 is pulled out along the operating shaft 51 and separated (FIG. 5).

Furthermore, the gate valve mechanism C in the open state is removed. When the gate valve mechanism C is removed, the sealing member 4 attached to the pipe branching port 11 and the operation shaft 51 connected to the sealing member 4 remain. 51 is removed (Fig. 6).

After removing all the members (other than the saddle member 1 and the support member 2), the cover plate 7 is attached to the upper surface of the pipe branch port 11 fitted with the sealing member, and the branch pipe removing operation is completed (Fig. 7).

Next, a second embodiment in which an insert holding mechanism is attached to the lid container body 6 will be described. In the lid container body 6 of the first embodiment described above, the insert body holding mechanism is provided with a threaded portion 621 on the outer peripheral surface of the guide tube portion 62 and an inwardly inclined pressing surface 622 on the top surface. , an elastic seal ring 623 for fastening is placed on the inclined pressing surface 622, and a fastening operation member 66 is attached (FIG. 8).

The fixing operation member 66 is formed by projecting an operation lever 662 from a cap body 661 covering the guide tube portion 62. In particular, the cap body 661 is provided with an insertion hole 663 for the operation shaft 51 on its upper surface, and an inner peripheral surface of the cap body 661. An inner threaded portion 664 that is screwed with the threaded portion 621 is provided on the inner side.

Then, the fastening operation member 66 is screwed into the guide tube portion 62 of the lid container body 6, and the branch pipe is removed using the removal tool in the same procedure as in the first embodiment.

First, the sluice valve mechanism C is operated to close the valve, the branch pipe B is separated, and the removal tool is attached. 61 , and the operation shaft 51 is protruded from the guide tube portion 62 .

When the operation shaft 51 protrudes, the operation shaft 51 can move freely within the guide tube portion 62 and the insertion hole 663 by first gently screwing the fixing operation member 66 (FIG. 10A). When the fixing operation member 66 is screwed and tightened by the operation lever 662, the elastic seal ring 623 is pressurized between the inclined pressing surface 622 and the inner surface of the cap body 661 and is flattened to press the operation shaft 51. The operating shaft 51 is in a state where it cannot move (holding state, FIG. 10B).

Therefore, when the sealing member 4 is at a predetermined position inside the main body 61 of the lid container body 6 (the state where the sealing member 4 does not protrude downward from the lid container body 6), the fastening operation member 66 is operated and the insertion body 5 ( With the operating shaft 51) held, the lid container body 6 is attached to the flange of the sluice valve mechanism C with the flange 65 (FIG. 9).

After that, the sluice valve mechanism C is opened, the holding operation member 66 is operated to release the holding state of the insert 5, and the pipe branch port 11 is water-sealed with the sealing plug 4 in the same manner as in the first embodiment. It is a thing.

As described above, in the second embodiment, the lid container body 6 is provided with an insertion body holding mechanism for preventing movement of the sealing body 4 incorporated in the main body part 61. This prevents contact with the valve body that operates and damages the sluice valve mechanism.

In the above-described two embodiments, the saddle member 1 and the support member 2 are used to newly connect the branch pipe B. The present invention can be carried out by adopting a pipe branch opening having a predetermined screw thread formed in the pipe branch opening.

1 Saddle member 11 Pipe branching port 12 Outer peripheral wall surface 13 Thread 2 Supporting member 3 Connecting bolt 4 Sealing body 41 Threaded portion 42 Sealing portion 43 Connecting portion (threaded hole)
5 Insert 51 Operating shaft 52 Sealing body connecting portion 52a Connecting plate 52b Fixing bolt 53 Operating handle 6 Lid container body 61 Body portion 62 Guide tube portion 621 Threaded portion 622 Inclined pressing surface 623 Elastic seal ring 63 O-ring 64 Handle 65 Flange 66 Fastening operation member 661 Cap body 662 Operation lever 663 Insertion hole 664 Internal screw portion 7 Lid plate A Water main pipe B Branch pipe C Gate valve mechanism a Water passage hole

Claims (4)

In a branch pipe line in which a branch pipe is connected to a pipe branch port branched from a main pipe via a gate valve mechanism,
The inner peripheral surface of the pipe branching port is formed with a thread protruding inward from the outer peripheral wall surface,
After separating the branch pipe with the sluice valve mechanism closed,
an insertion body is attached to a hermetic plug body having a threaded portion for screwing the tip thereof into the screw thread, and a base portion provided with a sealing portion for tightly inserting into the outer peripheral wall surface;
The sealing member is placed inside the lid container body mounted on the outside of the sluice valve mechanism so as to have a gap on the outer periphery thereof, and the insert is protruded outside the lid container body to prevent movement of the sealing member and the insert body. state and
The lid container body integrated with the sealing plug and the insert is replaced with a branch pipe, and the sealing plug is assembled to the outside of the gate valve mechanism in a water-sealed state,
opening the sluice valve mechanism, canceling the movement blocking state of the sealing member and the insert, and allowing the sealing member to enter the pipe branch port with the insert;
By screwing the sealing member, the sealing portion of the sealing member is pushed into the outer peripheral wall surface to seal the pipe branch port,
A method for removing the branch pipe by removing the rear lid container body, the sluice valve mechanism, and the insert body. 2. The branching structure according to claim 1, wherein the branching structure of the branch pipeline is composed of a saddle member having a branch port mounted so as to cover the outer peripheral surface of the main pipe, and a support member sandwiching the main pipe with the saddle member. How to remove the branch pipe. In a branch pipeline in which a branch pipe is connected via a gate valve mechanism to a pipe branch port branched from a main pipe, and a spiral thread protruding inward from the outer peripheral wall surface is formed on the inner peripheral surface of the pipe branch port With a branch pipe removal tool,
Consists of a hermetic plug body, an insert body and a lid container body,
The hermetic plug has a shape to be a hermetic plug for the pipe branching opening, and is formed on the threaded portion to be screwed to the thread on the front side, and is tightly inserted on the outer side peripheral wall surface when screwed on the thread on the base side. It is provided with a seal part that
The inserting body comprises an operating shaft having a distal end rotatably and detachably provided on the upper surface of the sealing member, and an operating handle provided at the base,
The lid container body is housed so as to have a gap around the outer periphery of the hermetic plug, the operation shaft protrudes outward in a water-sealed state, and the hermetic plug is incorporated inside so that it can be attached to the sluice valve mechanism. In addition, a branch pipe removing tool is characterized in that an insertion body holding mechanism for preventing movement of the operating shaft is attached to the projecting portion of the operating shaft . The insertion body holding mechanism is formed by forming the protruding portion of the operation shaft in the lid container body in the guide tube, providing a threaded portion on the outer peripheral surface of the guide tube, and tilting the top surface of the guide tube inwardly. an elastic seal ring for fastening is placed on the inclined pressing surface;
A fixing operation in which an operation lever is protruded from a cap body that covers the guide tube portion, has an insertion hole for an operation shaft provided on the upper surface, and has an inner screw portion that is screwed with the screw portion on the inner peripheral surface. 4. The branch pipe removal tool according to claim 3, wherein the member is attached to the guide cylinder.

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