JP2015055287A - Non-cutoff flow passage closing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-cutoff flow passage closing device capable of attaining an easy insertion of a closing bag to be inserted into a pipe flow passage as well as its prevention of damage under a non-cutoff flow state and capable of positively closing the pipe flow passage.SOLUTION: This invention relates to a non-cutoff flow passage closing device in which an insertion guide cylinder 22 internally fitted and stored in a closing case 20 under a state where a closing bag 4 is shrunk can be moved within the closing case 20 and a branch pipe part B along an axis core Y of the branch pipe part B until at least a part of the extremity end of the insertion guide cylinder 22 becomes an abutting attitude where it abuts against an outer surface side circumferential edge 2a of a branch port 2 at an outer circumferential surface 1a of a fluid pipe 1, and a shaft core adjustment part 50 that can be slid and contacted with the inner surface of the insertion guide cylinder 22 is positioned at a location corresponding to the branch port 2 in a radial direction of the fluid pipe 1 under a state in which the closing bag 4 within the insertion guide cylinder 22 kept under the abutted attitude can be inserted from within the insertion guide cylinder 22 into an in-pipe flow passage 3 of the fluid pipe 1 through the branch port 2 along the axis core Y of the branch pipe part B and positioned at a prescribed in-pipe flow passage closing position.

Description

  The present invention is a continuous flow channel having a closed bag inserted into a fluid pipe through a branch port formed in the fluid pipe and inflating and deforming to the enlarged diameter side to close the fluid pipe in the pipe. It relates to an occluding device.

  As this type of uninterrupted flow path blocking device, for example, Patent Document 1 discloses that a fluid flows through a branch pipe portion communicating with a perforation port (an example of a branch port) formed in a fluid pipe and the perforation port. A channel closing device is disclosed that includes a blocking bag that is inserted into an in-tube channel of a tube. Then, after the closing bag is inserted into the pipe flow path, the expansion bag is supplied into the closing bag so that the closing bag is inflated and deformed toward the diameter increasing side, thereby closing the pipe flow path. ing.

JP-A-8-75077

  Here, in the continuous flow type flow path closing device of Patent Document 1, since the closed bag is inserted into the in-pipe flow path of the fluid pipe via the branch pipe portion and the perforation port, In addition, there is a risk that the closure bag may be damaged or damaged by contact or being caught by burrs generated on the inner surface of the perforation port or protrusions existing on the inner surface of the branch pipe portion. There is a possibility that the insertion into the in-pipe flow path may be difficult.

  Further, in the uninterrupted flow state in which fluid flow is maintained in the in-pipe flow path of the fluid pipe, the fluid pressure from the fluid acts on the closed bag. Therefore, the closed bag is connected to the fluid pipe via the branch pipe portion and the perforated port. When inserted into the in-pipe flow path, it becomes easier to contact the burrs on the inner surface of the perforation port, the protrusions on the inner surface of the branch pipe part, etc., and the insertion into the in-pipe flow path may become more difficult.

  In particular, in such a continuous flow state, the closed bag inserted into the pipe flow path through the perforation port is downstream of the perforation opening (the axis of the branch pipe section) by the fluid pressure from the fluid flowing through the pipe flow path. It is pressed so as to move to the downstream side of the fluid pipe from the core. Therefore, there is a possibility that the in-tube flow path is closed at a position where the closed bag is deviated from the desired closed position, and the closed bag closed at the desired closed position is deformed or moved to the inner peripheral surface of the in-tube flow path. The degree of close contact varies, and the desired closing effect cannot be fully exerted, and there is a risk that the fluid will be insufficiently closed.

  The present invention has been made in view of the above-described circumstances, and the main problem is that an obstructed bag inserted into the in-tube flow channel in a continuous flow state in which fluid flow in the in-tube flow channel of the fluid pipe is maintained. An object of the present invention is to provide a continuous flow type flow path closing device that facilitates insertion and prevents breakage, and that can reliably close the flow path in the pipe.

According to a first characteristic configuration of the present invention, there is provided a blocking bag that is inserted into the fluid pipe through a branch port formed in the fluid pipe and inflates and deforms toward the diameter-expanding side to close the flow path in the fluid pipe. A continuous flow type flow path closing device provided,
A sealed case detachably connected to a branch pipe portion having a valve member communicating with the branch port;
An insertion guide tube fitted in the sealed case;
Over the sealing case and the insertion guide cylinder, a shaft that is slidably penetrated along the axis of the branch pipe portion while maintaining a sealed state, and has a passage provided inside,
The closed bag fixed at the tip of the shaft located in the insertion guide cylinder and elastically deformable to the diameter expansion side by the diameter expansion fluid supplied through the flow path; and
A pushing operation means for pushing and moving the shaft against the fluid pressure in the fluid pipe;
An axial center adjustment portion fixed to a distal end portion of the shaft located in the insertion guide tube or a proximal end portion of the closing bag and capable of sliding contact with an inner surface of the insertion guide tube;
The insertion guide cylinder accommodated in a state in which the closing bag is contracted in the insertion guide cylinder is configured such that at least a part of the distal end portion of the insertion guide cylinder is formed on the outer peripheral surface of the fluid pipe by the pushing operation means. It is configured to be movable in the sealed case and in the branch pipe portion along the axial center of the branch pipe portion until it comes into contact with the outer peripheral edge of the branch port.
The closing bag accommodated in the insertion guide cylinder in the abutting position is moved by the pushing operation means from the insertion guide cylinder through the branch port along the axis of the branch pipe portion. The axial core adjusting portion is connected to the branch port in the radial direction of the fluid pipe while being configured to be freely inserted into the pipe flow path of the pipe and in the state where the closing bag is located at a predetermined pipe flow path closing position. It exists in the point comprised so that it may be located in a corresponding location.

  According to the above configuration, basically, the internal flow path of the fluid pipe and the inside of the branch pipe part can be maintained in a sealed state by the sealed case connected to the branch pipe part and the shaft penetrating the sealed case. The in-tube flow path can be closed by a closed bag fixed to the tip of the shaft in an uninterrupted flow state in which the fluid flow in the in-tube flow path of the fluid pipe is maintained.

  An insertion guide cylinder is fitted in the sealing case, and the shaft is provided in the sealing case and the insertion guide cylinder so as to be slidable along the axis of the branch pipe portion. A blocking bag is provided in the insertion guide cylinder. The closed bag is housed in a contracted state, and the closing bag is fixed to the distal end portion of the shaft located in the insertion guide cylinder, and a pushing operation means for pushing and moving the shaft against the fluid pressure in the fluid pipe is provided. .

For this reason, by sliding the shaft along the axis of the branch tube portion by the pushing operation means, the insertion guide tube containing the blocking bag is made to resist the fluid pressure in the fluid tube, and the distal end portion of the insertion guide tube Is configured to be movable in the sealed case and in the branch pipe section along the axial center of the branch pipe section until at least a part thereof is in contact with the outer peripheral edge of the branch port on the outer peripheral surface of the fluid pipe. be able to. In addition, in a state where the insertion guide cylinder is in the contact posture, the pushing bag is further slid along the axis of the branch pipe portion by the pushing operation means, so that the blocking bag accommodated in the insertion guide cylinder is removed from the branch pipe. It can be configured such that it can be freely inserted into the in-pipe flow path of the fluid pipe from the inside of the insertion guide cylinder through the branch port along the axis of the part.
When the shaft penetrating the sealing case and the insertion guide cylinder is slid along the axis of the branch pipe portion, it first moves relative to the sealing case and relative to the insertion guide cylinder. (The shaft moves together with the insertion guide cylinder), and then, when the insertion guide cylinder contacts the outer peripheral edge of the branch port on the outer peripheral surface of the fluid pipe, it moves relative to the sealing case and the insertion guide cylinder ( The insertion guide tube is provided with a higher degree of adhesion than the sealed case so that only the shaft moves.

  As a result, even when the fluid pressure of the fluid flowing through the in-pipe flow path acts on the closed bag in an uninterrupted flow state, the closed bag is housed in the inserted guide tube until the insertion guide tube is in the contact posture. Thus, the inside of the sealed case and the inside of the branch pipe part can be moved along the axis of the branch pipe part without bringing the closing bag into contact with the inner surface of the sealed case and the inner surface of the branch pipe part.

  In particular, in a state where the insertion guide tube is in the contact posture, the closing bag accommodated in the insertion guide tube is moved by further sliding the shaft along the axis of the branch tube portion by the pushing operation means. When positioned at a predetermined in-tube flow path closing position in the in-tube flow path of the fluid pipe from the insertion guide cylinder through the branch port along the axial center of the insertion section, the tip end of the shaft located in the insertion guide cylinder or the closure bag An axial core adjusting portion fixed to the proximal end portion and slidably contacted with the inner surface of the insertion guide cylinder is configured to be located at a location corresponding to the branch port in the radial direction of the fluid pipe.

  For this reason, when the closing bag is positioned at the in-pipe flow path closing position, the axial core adjusting portion corresponds to the branch port in the radial direction of the fluid pipe (the axial core adjusting portion moves along the pipe axial direction of the fluid pipe. Then, it will be located at a position where it abuts the inner peripheral surface of the branch port, and the closed bag will be located downstream of the branch port (at the branch pipe part) by the fluid pressure from the fluid flowing through the pipe flow channel in an uninterrupted flow state. Even if it is pressed so as to move to the downstream side of the fluid pipe from the shaft core, the shaft core adjusting portion is in sliding contact with the inner surface of the insertion guide cylinder, and the closing bag is a burr on the inner surface of the branch port or the inner surface of the branch pipe portion. It is possible to keep the shaft concentric with the axial center of the branch pipe portion.

  As a result, it is possible to prevent the obstruction bag that is located at the position where the pipe flow path is closed and closes the pipe flow path from being damaged due to burrs on the inner surface of the branch port, protrusions on the inner surface of the branch pipe section, etc. In addition, the deformation and movement of the blocking bag can be reduced, and fluctuations in the degree of adhesion to the inner peripheral surface of the in-tube flow path can be prevented.

  Therefore, in an uninterrupted flow state in which the fluid flow in the in-tube flow path of the fluid pipe is maintained, the insertion of the closing bag inserted into the in-tube flow path is facilitated and damage is prevented, and the in-pipe flow path is securely closed. It was possible to obtain a continuous flow type channel closing device that can be obtained.

According to a second characteristic configuration of the present invention, the distal end portion of the insertion guide tube includes a stepped portion in which an inner diameter side portion projects from the outer diameter side portion of the insertion guide tube toward the distal end side,
The insertion guide tube in the abutting posture is in a state in which at least a part of the outer diameter side part is brought into contact with the outer peripheral edge and at least a part of the inner diameter side part is fitted in the branch port. It is in the point which is comprised so that positioning is possible.

According to the above configuration, the tip portion of the insertion guide tube is formed with the stepped portion in which the inner diameter side portion protrudes from the outer diameter side portion of the insertion guide tube toward the tip side. Moving along the axial center of the tube portion, causing at least a part of the outer diameter side portion of the stepped portion to contact the outer peripheral edge portion of the branch port of the outer peripheral surface of the fluid tube, and at least the inner diameter side portion The insertion guide tube can be positioned in a contact posture in which a part is fitted into the branch port. If the outer diameter of the insertion guide tube is slightly smaller than the inner diameter of the branch tube portion, the insertion guide tube can be more reliably positioned by the inner surface of the branch tube portion.
As a result, even when the shaft penetrating the insertion guide tube is deviated from the axis of the branch tube portion, the inner diameter side portion of the step portion formed in the insertion guide tube can be used as a branch port. It can be used as a guide member for insertion, and the shaft penetrating the insertion guide tube and the axis of the branch pipe portion can be positioned in a coaxial state.
Further, since the outer diameter side portion contacts the outer peripheral edge of the branch port while the inner diameter side portion of the step formed in the insertion guide tube is fitted in the branch port, the insertion guide tube is connected to the fluid pipe. It is possible to reliably prevent movement in the tube axis direction.
Further, since the inner diameter side portion of the step portion of the insertion guide cylinder is fitted into the branch port, the inner diameter side portion (in the direction along the tube axis direction of the fluid pipe) in the portion where the inner diameter side portion is fitted. When the closure bag is moved from the inside of the insertion guide cylinder in the abutting position to the in-tube flow path of the fluid pipe through the branch opening, the closure bag is covered with the inner surface of the branch opening. There is no contact with burrs or protrusions on the inner surface of the branch pipe portion, and the breakage of the blocking bag can be further prevented.

According to a third feature of the present invention, there is provided a blocking bag which is inserted into the fluid pipe through a branch port formed in the fluid pipe and expands and deforms toward the diameter-expanding side to close the flow path in the fluid pipe. A continuous flow type flow path closing device provided,
A sealed case detachably connected to the branch pipe portion having a mounting port portion integrally formed with the fluid pipe in a state of communicating with the branch port and a valve member mounted to the mounting port portion;
An insertion guide tube fitted in the sealed case;
Over the sealing case and the insertion guide cylinder, a shaft that is slidably penetrated along the axis of the branch pipe portion while maintaining a sealed state, and has a passage provided inside,
The closed bag fixed at the tip of the shaft located in the insertion guide cylinder and elastically deformable to the diameter expansion side by the diameter expansion fluid supplied through the flow path; and
A pushing operation means for pushing and moving the shaft against the fluid pressure in the fluid pipe;
An axial center adjustment portion fixed to a distal end portion of the shaft located in the insertion guide tube or a proximal end portion of the closing bag and capable of sliding contact with an inner surface of the insertion guide tube;
In the insertion guide cylinder accommodated in a state where the closure bag is contracted in the insertion guide cylinder, at least a part of the distal end portion of the insertion guide cylinder is formed in the mounting opening by the pushing operation means. It is configured to be movable in the sealed case and the branch pipe part along the axis of the branch pipe part until it comes into a contact posture to contact the contacted part,
The closing bag accommodated in the insertion guide cylinder in the abutting position is moved by the pushing operation means from the insertion guide cylinder through the branch port along the axis of the branch pipe portion. The axial core adjusting portion is connected to the branch port in the radial direction of the fluid pipe while being configured to be freely inserted into the pipe flow path of the pipe and in the state where the closing bag is located at a predetermined pipe flow path closing position. It exists in the point comprised so that it may be located in a corresponding location.

  According to the above configuration, basically, a sealed case connected to a branch pipe portion having a mounting port portion integrally formed with the fluid pipe in a state of communicating with the branch port and a valve member mounted to the mounting port portion; By the shaft penetrating the sealed case, the in-pipe flow path and the branch pipe portion of the fluid pipe can be maintained in a sealed state, and the shaft can be maintained in a continuous flow state in which the flow of fluid in the in-pipe flow path of the fluid pipe is maintained. The in-tube flow path can be closed by a closing bag fixed to the tip of the tube.

  An insertion guide cylinder is fitted in the sealing case, and the shaft is provided in the sealing case and the insertion guide cylinder so as to be slidable along the axis of the branch pipe portion. A blocking bag is provided in the insertion guide cylinder. The closed bag is housed in a contracted state, and the closing bag is fixed to the distal end portion of the shaft located in the insertion guide cylinder, and a pushing operation means for pushing and moving the shaft against the fluid pressure in the fluid pipe is provided. .

For this reason, by sliding the shaft along the axis of the branch tube portion by the pushing operation means, the insertion guide tube containing the blocking bag is made to resist the fluid pressure in the fluid tube, and the distal end portion of the insertion guide tube It can be configured to be movable in the sealed case and in the branch pipe portion along the axial center of the branch pipe portion until at least a part thereof is in a contact posture in contact with the contacted portion formed in the mounting opening. it can. In addition, in a state where the insertion guide cylinder is in the contact posture, the pushing bag is further slid along the axis of the branch pipe portion by the pushing operation means, so that the blocking bag accommodated in the insertion guide cylinder is removed from the branch pipe. It can be configured such that it can be freely inserted into the in-pipe flow path of the fluid pipe from the inside of the insertion guide cylinder through the branch port along the axis of the part.
When the shaft penetrating the sealing case and the insertion guide cylinder is slid along the axis of the branch pipe portion, it first moves relative to the sealing case and relative to the insertion guide cylinder. (The shaft moves together with the insertion guide tube.) After that, when the insertion guide tube comes into contact with the contacted portion formed in the mounting opening, the shaft moves relative to the sealing case and the insertion guide tube (only the shaft). The insertion guide tube is provided with a higher degree of adhesion than the sealed case.

  As a result, even when the fluid pressure of the fluid flowing through the in-pipe flow path acts on the closed bag in an uninterrupted flow state, the closed bag is housed in the inserted guide tube until the insertion guide tube is in the contact posture. Thus, the inside of the sealed case and the inside of the branch pipe part can be moved along the axis of the branch pipe part without bringing the closing bag into contact with the inner surface of the sealed case and the inner surface of the branch pipe part.

  In particular, in a state where the insertion guide tube is in the contact posture, the closing bag accommodated in the insertion guide tube is moved by further sliding the shaft along the axis of the branch tube portion by the pushing operation means. When positioned at a predetermined in-tube flow path closing position in the in-tube flow path of the fluid pipe from the insertion guide cylinder through the branch port along the axial center of the insertion section, the tip end of the shaft located in the insertion guide cylinder or the closure bag An axial core adjusting portion fixed to the proximal end portion and slidably contacted with the inner surface of the insertion guide cylinder is configured to be located at a location corresponding to the branch port in the radial direction of the fluid pipe.

  For this reason, when the closing bag is positioned at the in-pipe flow path closing position, the axial core adjusting portion corresponds to the branch port in the radial direction of the fluid pipe (the axial core adjusting portion moves along the pipe axial direction of the fluid pipe. Then, it will be located at a position where it abuts the inner peripheral surface of the branch port, and the closed bag will be located downstream of the branch port (at the branch pipe part) by the fluid pressure from the fluid flowing through the pipe flow channel in an uninterrupted flow state. Even if it is pressed so as to move to the downstream side of the fluid pipe from the shaft core, the shaft core adjusting portion is in sliding contact with the inner surface of the insertion guide cylinder, and the closing bag is rusted on the inner surface of the branch port and the inner surface of the branch pipe portion. It is possible to keep the shaft concentric with the axial center of the branch pipe portion.

  As a result, in an uninterrupted flow state, it is possible to prevent the blocking bag that is located at the closed position of the in-tube flow path and closes the in-tube flow path from being damaged by rust on the inner surface of the branch port, protrusions on the inner surface of the branch pipe portion, etc. In addition, the deformation and movement of the blocking bag can be reduced, and fluctuations in the degree of adhesion to the inner peripheral surface of the in-tube flow path can be prevented.

  Therefore, in an uninterrupted flow state in which the fluid flow in the in-tube flow path of the fluid pipe is maintained, the insertion of the closing bag inserted into the in-tube flow path is facilitated and damage is prevented, and the in-pipe flow path is securely closed. It was possible to obtain a continuous flow type channel closing device that can be obtained.

According to a fourth characteristic configuration of the present invention, the shaft core adjusting portion is configured by an shaft core adjusting cylinder member formed to have an outer diameter substantially the same as the inner diameter of the insertion guide cylinder,
A base end portion of the closure bag is provided with a base member that includes a fluid supply / discharge path communicating with the flow path and has an outer surface that can be slidably contacted with an inner surface of the shaft core adjusting cylinder member. In the point which is arranged so that it may fit in the axis adjustment cylinder member.

According to the above configuration, the base member provided with the fluid supply / discharge passage communicating with the flow passage formed inside the shaft is provided at the proximal end portion of the closing bag, and the base member is connected to the inner diameter of the insertion guide tube. Since it is arranged so as to be fitted inside an axis adjustment cylinder member as an axis adjustment part formed with an outer diameter of substantially the same diameter, the fluid for expanding the diameter supplied from the flow path is supplied into the closure bag. Using a cap member fixed to the tip of the shaft in a state where it can be discharged, in an uninterrupted flow state, deformation or movement of the closed bag that is located at the closed position of the in-tube flow path and closes the in-tube flow path is performed. This can be further reduced, and fluctuations in the degree of close contact with the inner peripheral surface of the pipe flow path can be further prevented.
That is, since a base member having an outer surface slidable on the inner surface of the shaft adjusting cylinder member is fitted into the shaft adjusting cylinder member slidable on the inner surface of the insertion guide cylinder, Due to the fluid pressure from the fluid flowing through the flow path, the closed bag located at the closed flow path in the pipe moves to the downstream side of the branch port (downstream of the fluid pipe from the axial center of the branch pipe part). Even if pressed, the outer surface of the cap member and the inner surface of the shaft adjusting cylinder member are in sliding contact, the outer surface of the shaft adjusting cylinder member and the inner surface of the insertion guide cylinder are in sliding contact, and the closing bag and the shaft are connected to the fluid pipe. It is possible to reliably prevent movement in the direction close to the branch port along the tube axis direction.
This ensures that the shaft is kept concentric with the axial center of the branch pipe in an uninterrupted flow state, and that the closed bag that is located at the closed position of the pipe and closes the pipe is not deformed or moved. This further reduces the fluctuation of the degree of close contact with the inner peripheral surface of the pipe flow path, and the pipe flow path can be closed more reliably.

  A fifth characteristic configuration according to the present invention is the radially inner side end of the fluid pipe at the distal end of the axial core adjusting portion and the branch port in a state where the closed bag is located at the closed flow path position in the pipe. Is that it is configured to be located at the same position in the radial direction of the fluid pipe.

  According to the above configuration, in the state in which the closing bag is located at the in-pipe flow path closing position, the distal end of the shaft core adjustment portion and the radially inner side end of the fluid pipe at the branch port are in the radial direction of the fluid pipe. Since it is configured to be located at the same position, the shaft core adjustment portion is located at a position corresponding to the branch port in the radial direction of the fluid pipe, and the tip of the shaft core adjustment portion is radially inward of the branch port. Fluid flow in the in-pipe flow path of the fluid pipe without projecting radially inward from the side end (same position as the inner peripheral surface of the fluid pipe in the radial direction) or retreating outward in the radial direction Can be maintained in good condition.

  According to a sixth characteristic configuration of the present invention, the outer peripheral surface of the shaft comes into contact with the outer surface of the bottom portion of the insertion guide tube in the contact posture as the shaft is pressed by the pressing operation means. The insertion position restricting means for restricting the insertion state of the closing bag into the fluid pipe to be the in-tube flow path closing position is formed to protrude outward in the radial direction of the shaft.

According to the above configuration, since the insertion position restricting means is formed on the outer peripheral surface of the shaft so as to protrude radially outward of the shaft, the fluid pipe is inserted from the inside of the insertion guide cylinder in the contact posture through the branch port. When the closure bag is moved to the in-pipe flow path, the insertion position restricting means abuts against the outer surface of the bottom of the insertion guide cylinder in a contact posture as the shaft is pushed by the pushing operation means. The insertion state can be regulated so as to be the in-tube flow path blockage position.
Thus, when the closure bag is inserted into the in-tube flow path of the fluid pipe, the insertion position restricting means is simply brought into contact with the outer surface of the bottom of the insertion guide cylinder in the abutting posture, so that the closure bag is fixed to the predetermined flow path in the in-tube flow path. It can be easily and reliably positioned at the in-tube flow path blocking position.

  According to a seventh characteristic configuration of the present invention, the sealed case includes an internal space having a length capable of accommodating at least the insertion guide cylinder and the closing bag moved from the insertion guide cylinder. It is in.

According to the above configuration, the sealed case includes the internal space having a length capable of accommodating at least the insertion guide cylinder and the closure bag moved from the insertion guide cylinder. From the state in which the bag is moved from the inside of the insertion guide cylinder (for example, the state in which the closure bag is moved from the inside of the insertion guide cylinder and is positioned at a predetermined in-tube flow path closing position in the in-tube flow path), the shaft is connected to the branch pipe section. Even when the closure bag is not accommodated in the insertion guide cylinder when it is extracted along the shaft core, the insertion guide cylinder and the closure bag can be accommodated in the internal space formed in the sealed case.
Thereby, in a state where the insertion guide cylinder and the closure bag are completely accommodated in the internal space of the sealed case, the sealed case can be detached from the branch pipe portion, and when the sealed case is detached, carried out, transported, etc. It is possible to satisfactorily prevent the blocking bag from being damaged by contact with an object or the like.

  According to an eighth characteristic configuration of the present invention, after the closing bag is inserted into the in-tube flow path closing position in the in-tube flow path of the fluid pipe along the axial center of the branch pipe portion, the pipe of the fluid pipe A state that is configured to be elastically expandable and deformable in the axial direction and the radially outward side, and that the closing bag is elastically expanded and deformed to close the inner peripheral side edge of the branch port on the inner peripheral surface of the fluid pipe Thus, the in-pipe flow path of the fluid pipe is closed.

According to the above configuration, after the closing bag is inserted in the in-tube flow path closing position in the in-tube flow path of the fluid pipe along the axis of the branch pipe, the inside of the pipe located concentrically with the axis of the branch pipe In the state where the inner peripheral side of the branch port on the inner peripheral surface of the fluid pipe is closed by elastically expanding and deforming in the tube axis direction and the radially outer side of the fluid pipe at the flow path closing position, The flow path can be closed.
As a result, even in the case of an uninterrupted flow state, it is possible to simply elastically deform and deform the closed bag inserted in the pipe flow path closing position and maintained concentric with the axial center of the branch pipe part by the shaft core adjusting part. The flow path can be easily and reliably closed.

  According to a ninth characteristic configuration of the present invention, in the outer peripheral surface of the closing bag, the portions located on both sides of the shaft in the tube axis direction are arranged such that when the closing bag is elastically expanded and deformed, An annular seal portion that press-contacts the inner peripheral surface over the entire circumference in the circumferential direction and frictionally holds the closure bag is provided.

According to the above configuration, the outer peripheral surface of the fluid bag is located on the outer peripheral surface of the closed bag at both sides of the shaft in the tube axis direction when the closed bag is elastically expanded and deformed at the closed flow path in the tube. Since an annular seal portion that press-contacts the entire circumference in the circumferential direction and frictionally holds the closure bag is projected, the blockage is caused by the fluid pressure from the fluid flowing through the pipe flow path in the non-continuous flow state. Even if the bag is pressed so as to move to the downstream side of the branch port (downstream of the fluid pipe from the axis of the branch pipe part), due to the friction between both annular seal parts and the inner peripheral surface of the fluid pipe, It is possible to further prevent the blocking bag from moving to the downstream side of the fluid pipe.
Further, even if there are burrs, protrusions, or mortar peeling on the inner peripheral side of the branch port on the inner peripheral surface of the fluid pipe, the annular seal portion is in the direction of the pipe axis of the fluid pipe. Since it is pressed against the inner peripheral surface of the fluid pipe at a position deviated from the inner surface side peripheral edge portion, the water stoppage does not decrease.
In addition, even when the inner peripheral surface side peripheral portion of the branch port on the inner peripheral surface of the fluid pipe is formed in a curved shape toward the branch port, the annular seal portion is on the inner surface side in the tube axis direction of the fluid pipe. Since it press-contacts with the internal peripheral surface of a fluid pipe | tube in the position biased from the peripheral part, a water stop does not fall.

A longitudinal sectional view showing a fluid piping system to which a branch pipe portion communicating with a perforation port is connected Longitudinal sectional view showing a state where a continuous water type channel closing device is connected to the branch pipe section A longitudinal sectional view showing a state where the insertion guide cylinder is brought into a contact posture by pushing the cylinder shaft. Longitudinal sectional view showing the process of further pushing the cylinder shaft to insert the closure bag into the pipe flow path Longitudinal sectional view showing a state where the insertion position restricting convex portion is in contact with the bottom outer surface of the insertion guide cylinder and the closing bag is positioned at the in-tube flow path closing position The longitudinal cross-sectional view which shows the state which carried out the elastic expansion deformation of the obstruction | occlusion bag located in the in-pipe flow-path obstruction | occlusion position Longitudinal sectional view showing a state in which fluid pressure is applied to an elastically inflated and closed bag Longitudinal sectional view showing the process of removing the cylinder shaft and storing the closed bag in the sealed case from the closed position of the in-pipe channel Longitudinal sectional view showing a state where the insertion guide tube and the closing bag are accommodated in the sealed case Longitudinal sectional view showing the state where the continuous water type channel closing device is detached from the branch pipe section Longitudinal sectional view showing the state of the inner plug attached to the hole Longitudinal sectional view showing the state of the inner plug and lid attached to the hole Longitudinal sectional view showing the configuration of an insertion guide cylinder and the like according to another embodiment Longitudinal sectional view showing the configuration of an insertion guide cylinder and the like according to another embodiment

1 to 10 show a water pipe 1 through a perforated port (an example of a branch port) 2 formed in a cast iron water pipe (an example of a fluid pipe) 1 constituting a part of a fluid piping system. Using the continuous flow type flow blocking device A provided with a closed bag 4 that is inserted and expands and deforms toward the diameter expansion side to close the flow channel 3 of the water pipe 1, the water flows through the water pipe 1. A flow path closing method for closing the in-pipe flow path 3 while maintaining a continuous water state (an example of a continuous flow state) while maintaining the flow of clean water (an example of fluid) Q will be described.
In addition, the flow path closing method using such a flow path closing apparatus A closes the in-pipe flow path 3 of the water pipe 1 with the close bag 4 in the vicinity of the perforation port 2, thereby closing the closed bag in the in-pipe flow path 3. 4. Water pipe 1 or fire hydrant (not shown) that has reached the end of its useful life in the downstream part of the part closed by 4 or has reached the renewal period due to water leakage or failure due to deterioration, etc. It is carried out for renewal work and repair work.

  Specifically, as shown in FIG. 1, first, a divided structure is provided in a predetermined region (a region including a planned location for drilling the perforation port 2) upstream of a location where a water hydrant or the like is updated in the water pipe 1. The split T-shaped tube (an example of a T-shaped joint) 5 is mounted in a watertight state, and a valve mounting port (an example of a mounting port) 6 of the split T-shaped tube 5 is connected to a gate valve (an example of a valve member). The branch pipe part connection process which connects 7 in a watertight state is performed.

The split T-shaped pipe 5 is constituted by a partially cylindrical split joint body 5A that is divided into three in a pipe circumferential direction that can be externally mounted from the radial direction with respect to the water pipe 1, and the pipe circumference of each split joint body 5A. At both ends in the direction, connecting flange portions 5a for detachably fixing and connecting the adjacent ends of the split joint body 5A sheathed on the water pipe 1 through a plurality of bolts 8 and nuts 9 are integrally formed. ing.
A seal holding groove 5b formed on the inner surface of each split joint body 5A is fitted with a synthetic rubber sealing material 5c that seals between the outer peripheral surface 1a of the water pipe 1 in a watertight state, A cylindrical valve mounting port 6 having an inner diameter larger than the diameter of the perforation port 2 projects toward the radially outer side of the water pipe 1 at the center of one split joint body 5A. It is integrally formed in a state.

The valve mounting port 6 communicates with the piercing port 2 of the water pipe 1 and has a pipe portion 6a having an inner diameter larger than the diameter of the piercing port 2 and a connection formed at the downstream end of the pipe portion 6a. A flange portion 6b and an annular groove 6c formed at an inner diameter side portion of the connecting flange portion 6b and capable of engaging with an upstream end portion of the tubular portion 7a of the gate valve 7 are provided.
A connecting flange portion 7A that protrudes from a longitudinal intermediate portion of the tubular portion 7a of the gate valve 7 is fastened and fixed to the connecting flange portion 6b of the valve mounting port portion 6 by bolts 10 and nuts 11 so as to be detachable. ing.

The gate valve 7 has a cylindrical portion 7a formed with an inner diameter that is larger than the inner diameter of the perforation port 2 described later and slightly smaller than the inner diameter of the tube portion 6a of the valve mounting port portion 6, and a cylindrical portion 7a. In the watertight state formed at the intermediate portion in the longitudinal direction, the upstream end of the tubular portion 7a is engaged with the annular groove 6c of the valve mounting port 6 via an O-ring (not shown), Bolts 12 and nuts are connected to the upstream connecting flange portion 7A, which is detachably fastened to the connecting flange portion 6b of the pipe portion 6a by the nut 11, and to the connecting flange portion 20A of the sealing case 20 of the flow path closing device A described later. 13 is a valve body that can shut off the flow path of the downstream side connecting flange portion 7B that is detachably connected in a watertight manner through the tube 13, and the tubular portion 7a between the connecting flange portion 7A and the connecting flange portion 7B. 7C.
That is, the valve mounting port 6 and the gate valve 7 in the split joint body 5A function as the branch pipe portion B, and the outer peripheral surface of the water pipe 1 (the perforation port 2 is provided along the axis Y in the branch pipe portion B). A flow path is formed which communicates with a portion to be perforated).

Next, since it is a known configuration, illustration is omitted for the sake of simplicity. However, the perforation device is fastened and connected to the connection flange portion 7B on the downstream side of the gate valve 7, and the water pipe 1 is connected by the hole saw of the perforation device. A circular perforation port 2 is formed in the tube wall.
Specifically, the perforating apparatus includes a bottomed cylindrical casing having a connecting flange portion that can be connected to a connecting flange portion 7B on the downstream side of the gate valve 7 in a watertight manner via bolts and nuts, and a bottom portion of the casing. And a hole saw (cylindrical rotary cutter) that is movable in the longitudinal direction of the casing and is rotatable.
Then, the connecting flange portion of the casing is tightened and connected to the connecting flange portion 7B of the gate valve 7 in which the valve body 7C is in a closed state in a watertight state via bolts and nuts, and the hole saw of the punching device is connected to the branch pipe portion. It is fed along the axial center Y of B through the cylindrical portion 7a of the gate valve 7, the valve body 7C that has been opened, and the pipe portion 6a of the valve mounting port 6 to form a circular shape on the pipe wall of the water pipe 1 A perforating operation process for perforating and forming the perforation port 2 is executed. After the perforated port 2 is formed, the hole saw and the circularly cut piece are accommodated in the casing, and the valve body 7C is closed so that the connection flange of the casing and the connection flange 7B of the gate valve 7 are closed. The tightening connection is released, and the punching device is removed from the gate valve 7.

  Subsequently, as shown in FIGS. 2 to 7, the flow path closing device A is connected to the gate valve 7 in a watertight state, and the in-pipe flow path closing process is executed. First, the configuration of the flow path closing device A will be described.

  As shown in FIG. 2, the flow path closing device A is fitted in a sealed case 20 that is detachably connected to a branch pipe portion B that communicates with the perforation port 2 and has a gate valve 7. The insertion guide cylinder 22, the sealing case 20, and the insertion guide cylinder 22 are slidably penetrated along the axis Y of the branch pipe portion B while maintaining a sealed state. The cylindrical shaft (an example of the shaft) 30 provided and the distal end portion 30B of the cylindrical shaft 30 located in the insertion guide tube 22 are fixed and expanded by the diameter-enlarging fluid P supplied through the flow passage 30A. The closed bag 4 that is elastically expandable and deformable on the radial side, the pushing operation means 40 that pushes and moves the cylinder shaft 30 against the fluid pressure in the water pipe 1, and the tip of the cylinder shaft 30 that is located in the insertion guide cylinder 22 Axial core tone fixed to the portion 30B and capable of sliding contact with the inner surface 22c of the insertion guide tube 22 (An example of the axis adjusting section) tubular member comprises a 50 and.

The sealed case 20 includes a cylindrical wall 20a formed to have an inner diameter that is substantially the same as the inner diameter of the cylindrical portion 7a of the gate valve 7, and a bottom wall portion 20b that closes the downstream end of the cylindrical wall 20a. It is formed in a bottomed cylindrical shape, and includes an insertion guide cylinder 22 to be described later and an internal space 21 having a length capable of accommodating the closing bag 4 moved from the insertion guide cylinder 22. A connecting flange portion 20A is formed at the upstream end of the cylindrical wall 20a. The connecting flange portion 20A is connected to the connecting flange portion 7B on the downstream side of the gate valve 7 by a bolt 12 and a nut 13 so as to be detachable and tightened in a watertight state. In the bottom wall portion 20b, a cylindrical shaft 30 provided with a closing bag 4 for closing the in-pipe flow path 3 of the water pipe 1 at the tip portion 30B penetrates slidably while maintaining a sealed state by the annular seal member 20c. It is installed.
The sealed case 20 is provided with an eye nut 20e provided with an annular locking portion 20d at a location near the bottom wall portion 20b on the outer peripheral surface of the cylindrical wall 20a and opposed to each other across the cylindrical shaft 30. It is fixed by appropriate fixing means (not shown) such as a bolt fixed to the outer peripheral surface of the wall 20a.

  The insertion guide cylinder 22 includes a cylindrical wall 22a formed to have an outer diameter slightly smaller than the inner diameter of the cylindrical part 7a of the gate valve 7, and a bottom wall part 22b that closes the downstream end of the cylindrical wall 22a. It has an inner space (not shown) which is formed in a bottomed cylindrical shape and can accommodate an axis adjusting cylinder member 50 and a closing bag 4 which will be described later. On the bottom wall portion 22b, a cylindrical shaft 30 provided with a closing bag 4 for closing the in-pipe flow path 3 of the water pipe 1 at the distal end portion 30B is slidable while maintaining a sealed state by an annular elastic holding member 22d. It is penetrating. The elastic holding member 22d frictionally holds the bottom wall portion 22b of the insertion guide tube 22 and the tube shaft 30, and the bottom wall portion of the insertion guide tube 22 when the insertion guide tube 22 and the tube shaft 30 move relative to each other. It is comprised with the rubber | gum etc. which can prevent 22b and the cylinder shaft 30 from being damaged. Note that the degree of adhesion (friction retention) of the bottom wall portion 22 b of the insertion guide tube 22 with respect to the outer peripheral surface of the cylindrical shaft 30 by the elastic holding member 22 d is an annular shape of the bottom wall portion 20 b of the sealed case 20 with respect to the outer peripheral surface of the cylindrical shaft 30. The cylinder shaft 30 is provided through the insertion guide cylinder 22 and the sealing case 20 so as to be higher than the degree of adhesion (friction retention) by the seal member 20c.

  Further, the upstream end portion (tip portion) of the insertion guide tube 22 is provided with a step portion 22A in which an inner diameter side portion 22f protrudes from the outer diameter side portion 22e of the insertion guide tube 22 toward the distal end side. The outer diameter of the portion 22 e is slightly larger than the inner diameter of the perforation port 2, and the outer diameter of the inner diameter side portion 22 f is slightly smaller than the inner diameter of the perforation port 2. As a result, at least a part of the outer diameter side portion 22e is brought into contact with the outer peripheral edge 2a of the perforation port 2 in the outer peripheral surface 1a of the water pipe 1, and at least a part of the inner diameter side portion 22f is fitted into the perforation port 2. The insertion guide tube 22 is configured to be positioned in the branch pipe portion B in the abutted posture.

  The cylindrical shaft 30 is formed in a cylindrical shape and includes a flow passage 30 </ b> A therein, and the branched pipe is maintained in a sealed state over the bottom wall portion 20 b of the sealed case 20 and the bottom wall portion 22 b of the insertion guide tube 22. It slidably penetrates along the axis Y of the part B.

  The distal end portion 30B of the cylindrical shaft 30 is configured so that the fitting cylindrical portion 4a of the base member 4A provided at the proximal end portion of the closing bag 4 can be fitted therein, and the distal end portion 30B of the cylindrical shaft 30 includes A pair of screw holes 30 b into which the set screws 30 a can be screwed are formed so as to penetrate in the radial direction of the cylindrical shaft 30. As a result, in the state in which the fitting cylinder part 4a is fitted in the tip part 30B of the cylinder shaft 30, the set screw 30a is changed to the locking step part 4b in which the tip part of the set screw 30a is formed in the fitting cylinder part 4a. The closure bag 4 can be fixed to the distal end portion 30B of the cylindrical shaft 30 in a watertight state by being screwed into the screwing hole 30b until it is brought into contact with and locked.

The rear end portion 30C of the cylindrical shaft 30 is configured by a pulley arrangement member that includes a pulley 30c that closes the passage 30A and is pivotally supported around a rotation shaft (not shown). A chain (or a wire or the like) 41 of the pushing operation means 40 to be described later can be bridged across the pair of annular locking portions 20d of the sealed case 20 via the pulley 30c.
On the upstream side of the rear end portion 30C of the cylindrical shaft 30, a supply path 31 for supplying the diameter-enlarging fluid P from a supply source (not shown) outside the cylindrical shaft 30 to the flow path 30A via the supply valve 31a. And the discharge path 32 which discharges | emits the diameter expansion fluid P in the flow path 30A through the discharge valve 32a is provided.

  In addition, a pair of insertion position restricting projections (an example of an insertion position restricting means) 30 </ b> D protrudes radially outward of the tubular shaft 30 on the outer peripheral surface of the tubular shaft 30 at positions facing each other with the tubular shaft 30 therebetween. The insertion position restricting convex portion 30D is formed so as to contact the outer surface (bottom portion outer surface) of the bottom wall portion 22b of the insertion guide tube 22 when the tube shaft 30 slides along the axis Y of the branch tube portion B. In contact therewith, the insertion state of the cylinder shaft 30 is restricted to the maximum insertion position (the insertion state of the closing bag 4 into the water pipe 1 is restricted to be the in-pipe flow path closing position).

  The blocking bag 4 is fixed to the distal end portion 30B of the cylindrical shaft 30 located in the insertion guide cylinder 22, and can be elastically expanded and deformed to the diameter expansion side by the diameter expansion fluid P supplied through the flow path 30A. Configured. As the diameter expansion fluid P, if it is supplied into the closure bag 4 and the closure bag 4 can be elastically expanded and deformed to close the in-pipe flow path 3, a gas such as compressed air, water or the like can be used. Liquid can be used.

  Specifically, the closure bag 4 supplies the expansion fluid P into the bag body 4B via the flow passage 30A and the bag body 4B that is elastically expandable and deformable to the expansion side by the expansion fluid P. And a cap member 4A having a fluid supply / discharge passage 4c that can be discharged.

  The bag body 4B is formed in a bag shape, and is an inner bag made of rubber such as natural rubber or synthetic rubber (not shown), and a fibrous member such as cloth, rubber, or the like, or these are integrated in layers. A double structure is formed by an outer bag (not shown) such as a flexible member. Note that the structure may be a single structure or a triple structure or more instead of the double structure.

  The base member 4A is fitted with a fluid supply / discharge passage 4c inside, with one end side fitted into the distal end portion 30B of the cylindrical shaft 30 and the other end side penetrating the bag body 4B and located in the bag body 4B. Cylindrical in-bag screwing member that is located in the bag 4a and the bag main body 4B and is screwed into a female screw (not shown) formed on the outer surface of the other end of the fitting cylinder 4a. 4e and a cylindrical outer bag mounting member that is fitted to one end side of the fitting tube portion 4a located outside the bag body 4B and sandwiches a part of the bag body 4B between the bag inner screw 4e 4f is screwed into a female screw portion (not shown) formed on the outer surface of one end of the fitting tube portion 4a located outside the bag body 4B, and the bag outer attachment member 4f is screwed into the bag inner screw member 4e. And a fixing nut 4g that is fastened and fixed to the side.

  The longitudinal direction of the fitting tube portion 4a is arranged along the longitudinal direction of the tube shaft 30 (the axis Y direction of the branch tube portion B), and the diameter expansion fluid P is supplied into the bag body 4B. In the absence of the bag body 4B, the bag body 4B is configured to be foldable in a state of being reduced in a rod shape so that the other end portion of the fitting cylinder portion 4a penetrating into the bag body 4B is the center. When the bag body 4B is folded in a state of being reduced to a rod shape, the outer diameter of the bag body 4B is slightly smaller than the inner diameter of the insertion guide tube 22 and is configured to be accommodated in the insertion guide tube 22. In the present embodiment, the bag main body 4B accommodated in the insertion guide cylinder 22 is in a state where the outer surface of the bag main body 4B is in close contact with the inner surface 22c of the insertion guide cylinder 22 (friction held).

On the other hand, the bag main body 4B is configured to be elastically expanded and deformed toward the diameter-expanding side to have a bag-like substantially cylindrical shape when the diameter-expanding fluid P is supplied therein (see FIG. 6). The outer diameter of the surface can be satisfactorily adhered to the inner peripheral surface of the pipe flow path 3. That is, when the bag body 4B is elastically expanded and deformed into a substantially cylindrical shape, the bag body 4B has a cylindrical diameter that increases in the longitudinal direction of the fitting tube portion 4a (longitudinal direction of the tube shaft 30). The cylinder is inflated and deformed, and in a direction orthogonal to the longitudinal direction of the fitting cylinder portion 4a, the cylinder is expanded and deformed so that the height of the cylinder is increased.
And on the outer peripheral surface of the bag main body 4B (blocking bag 4), the blocking bag 4 is located at positions located on both sides of the fitting tube portion 4a (tube shaft 30) in the direction orthogonal to the longitudinal direction of the fitting tube portion 4a. An annular seal portion 4i that protrudes from the inner peripheral surface of the water pipe 1 and frictionally holds the closed bag 4 by being in contact with the inner peripheral surface of the water pipe 1 when it is elastically expanded and deformed.

When one end of the fitting cylinder 4a is fitted into the tip 30B of the cylinder shaft 30 on the outer surface on one end of the fitting cylinder 4a, it corresponds to a screwing hole 30b formed through the tip 30B. A locking step portion 4b is formed at a position so as to be recessed from the outer surface toward the inner diameter side, and on the outer surface further on the end side than the locking step portion 4b, the flow path in the tip portion 30B of the cylindrical shaft 30 is formed. A pair of O-rings 4h that maintain a watertight state between the inner surface of 30A are disposed.
The outer diameter of the bag outer mounting member 4f is formed to be slightly smaller than the inner diameter of the shaft core adjusting cylinder member 50 so that the outer diameter of the bag outer mounting member 4f is fitted into a shaft core adjusting cylinder member 50 described later. The shaft core adjusting cylinder member 50 is configured to be slidable on the inner surface 50a.

  The pushing operation means 40 is configured to push and move the cylindrical shaft 30 against the fluid pressure in the water pipe 1, and can be locked to a pair of annular locking portions 20 d provided in the sealed case 20. One chain (or a wire or the like) spanned across the pair of annular locking portions 20d by the hook member 42 via the hook member 42 and a pulley 30c disposed at the rear end portion 30C of the cylindrical shaft 30. 41 and an operating lever 43 for winding the chain 41 to the tightening side. The operation lever 43 not only operates to wind the chain 41 to the tightening side, but can also hold the position of the chain 41 in the tightened position or operate the release side to release the tightening ( Registered trademark, the same shall apply hereinafter).

The axial center adjusting cylinder member 50 is fixed to the distal end portion 30B of the cylindrical shaft 30 located in the insertion guide cylinder 22, and the outer surface of the axial center adjusting cylinder member 50 is in sliding contact with the inner surface 22c of the insertion guide cylinder 22. Thus, it is fitted inside the insertion guide tube 22.
Specifically, the axial center adjusting cylinder member 50 has a cylindrical wall portion formed with an outer diameter slightly smaller than the inner diameter of the insertion guide cylinder 22 and an inner diameter slightly larger than the outer diameter of the bag outer mounting member 4f. 50b and the bottom wall part 50c in which the front-end | tip part 30B of the cylinder shaft 30 penetrates are formed in the bottomed cylinder shape.

A pair of screw holes 52 into which the set screw 51 can be screwed are formed in the bottom wall portion 50c so as to penetrate in the radial direction of the shaft adjusting cylinder member 50 (the radial direction of the cylinder shaft 30). As a result, the shaft adjusting cylinder member 50 is screwed into the screw hole 52 until the set screw 51 is brought into contact with and locked to the outer peripheral surface of the tip 30B of the tube shaft 30. Can be fixed to the tip 30B of the cylindrical shaft 30.
As described above, in a state where the shaft core adjusting cylinder member 50 is fixed to the distal end portion 30B of the tube shaft 30, at least a part of the inner surface 50a of the tube wall portion 50b of the shaft core adjusting cylinder member 50 is the base member 4A. The bag outer mounting member 4f is positioned in the state of being close to the radially outer side of the outer surface of the bag outer mounting member 4f.

As shown in FIG. 2, the connecting flange portion 20 </ b> A of the sealing case 20 of the flow path closing device A configured as described above is connected to the connecting flange portion 7 </ b> B on the downstream side of the gate valve 7 via a bolt 12 and a nut 13. Tighten in a watertight state.
In this state, in the internal space 21 of the sealed case 20, the insertion guide cylinder 22 in which the reduced closure bag 4 is accommodated, the tip of the inner diameter side portion 22 f of the stepped portion 22 </ b> A in the insertion guide cylinder 22 is located in the sealed case 20. It is located in the vicinity of the connecting flange portion 20 </ b> A and is in a state where the upper surface of the insertion position regulating convex portion 30 </ b> D of the cylindrical shaft 30 is located at a position where it abuts against the inner surface of the bottom wall portion 20 b of the sealed case 20. That is, in the direction along the axis Y of the branch pipe portion B, the distance between the lower surface of the insertion position restricting convex portion 30D and the outer surface of the bottom wall portion 22b of the insertion guide tube 22 is determined by the step 22A of the insertion guide tube 22 being perforated. After being in contact with the outer peripheral edge 2a of the mouth 2, the insertion guide tube 22 is set so as to be equal to the distance for inserting the tube shaft 30 up to the maximum insertion position (intra-tube flow path closing position). Is accommodated in the internal space 21 of the sealed case 20.

  Next, as shown in FIG. 3, the valve body 7 </ b> C is opened, the chain 41 is wound around the tightening side by the operation lever 43 of the pushing operation means 40, and the clean water flowing through the in-pipe flow path 3 is operated. The cylindrical shaft 30 is resisted against the fluid pressure of Q through the cylindrical portion 7a of the gate valve 7 along the axis Y of the branch pipe portion B, the valve body 7C, and the pipe portion 6a of the valve mounting port portion 6 in the pipe. Push in the flow path 3 side.

In this way, when the cylindrical shaft 30 is slid along the axis Y of the branch pipe portion B, the cylindrical shaft 30 moves relative to the sealed case 20 and the insertion guide cylinder 22 as shown in FIG. In the state where it does not move relative to the guide tube 22, it moves together with the insertion guide tube 22, and at least a part of the step portion 22 A of the insertion guide tube 22 contacts the outer peripheral side peripheral portion 2 a of the perforation port 2 in the outer peripheral surface 1 a of the water pipe 1. The contact posture comes into contact.
In this contact posture, the insertion guide cylinder 22 is configured such that at least a part of the outer diameter side portion 22e of the step portion 22A abuts the outer surface side peripheral edge portion 2a and at least a part of the inner diameter side portion 22f is fitted into the perforation port 2. In addition, since the outer diameter of the insertion guide cylinder 22 is slightly smaller than the inner diameter of the branch pipe portion B, the insertion guide cylinder 22 is more reliably secured by the inner surface of the branch pipe portion B. Is positioned.

As a result, even when the fluid pressure of the clean water Q flowing through the in-pipe flow path 3 acts on the closed bag 4 in the uninterrupted flow state, the closed bag 4 is inserted into the inserted guide until the insertion guide cylinder 22 comes into the contact posture. In the state accommodated in the cylinder 22, the closure bag 4 is brought into contact with the inner surface of the sealed case 20 and the inner surface of the branch pipe part B, and the inside of the sealed case 20 and the branch pipe along the axis Y of the branch pipe part B. The part B can be moved.
Even when the cylindrical shaft 30 penetrating the insertion guide tube 22 is displaced from the axis Y of the branch tube portion B, the inner diameter side portion 22f of the step portion 22A formed in the insertion guide tube 22 is The insertion guide tube 22 can be used as a guide member when the insertion guide tube 22 is inserted into the perforation port 2, and the axial center Y of the cylindrical shaft 30 branch pipe portion B penetrating the insertion guide tube 22 is positioned coaxially. Can do.
Further, since the outer diameter side portion 22e abuts on the outer peripheral side peripheral portion 2a of the perforation port 2 in a state where the inner diameter side portion 22f of the step portion 22A formed in the insertion guide cylinder 22 is fitted into the perforation port 2, It is possible to reliably prevent the insertion guide tube 22 from moving in the direction of the tube axis X of the water pipe 1.
In addition, since the inner diameter side portion 22e of the step portion 22A of the insertion guide cylinder 22 is fitted into the perforation port 2, the inner surface side of the perforation port 2 (of the water pipe 1) The inner pipe side of the water pipe 1 from the inside of the insertion guide tube 22 in the contact position through the perforation port 2 as described later. When the closure bag 4 is moved to 3, the closure bag 4 does not come into contact with the burrs on the inner surface of the perforation port 2, the projections on the inner surface of the branch pipe portion B, and the like, and the breakage of the closure bag 4 is further prevented. be able to.

  Thereafter, the chain 41 is further wound up to the tightening side by the operating lever 43 of the push-in operating means 40, and the cylindrical shaft 30 is moved against the fluid pressure of the clean water Q flowing through the pipe flow path 3. Push-in operation is performed along the axis Y of B.

  In this manner, when the insertion guide tube 22 is in the contact posture, the tube shaft 30 is further slid along the axis Y of the branch tube portion B toward the in-tube flow path 3 side, as shown in FIG. As described above, the cylinder shaft 30 moves relative to the sealing case 20 and the insertion guide cylinder 22, and only the closing bag 4 and the shaft adjusting cylinder member 50 fixed to the distal end portion 30B of the cylinder shaft 30 are branched pipe portions. It moves to the in-pipe flow path 3 side along the axis Y of B.

As shown in FIG. 5, this pushing operation is performed until the lower surface of the insertion position restricting convex portion 30 </ b> D of the cylindrical shaft 30 contacts the outer surface of the bottom wall portion 22 b of the insertion guide tube 22. That is, the cylindrical shaft 30 is operated until the insertion state of the cylindrical shaft 30 is located at the maximum insertion position (the closed bag 4 is in the pipe flow path closed position).
In this state, the closing bag 4 is located at the desired in-tube flow path closing position in the in-tube flow path 3, and the axial core adjusting cylinder member 50 is located at the location corresponding to the perforation port 2 (axial core in the radial direction of the water pipe 1. When the adjustment tube member 50 moves along the tube axis X direction of the water pipe 1, the adjustment tube member 50 is located at a position where the adjustment tube member 50 abuts the inner peripheral surface of the hole 2. One radial inner end is located at the same position in the radial direction of the water pipe 1 (see FIG. 5).

  For this reason, the said closure bag 4 is the downstream of the perforation port 2 (from the axial center Y of the branch pipe part B of the water pipe 1 by the fluid pressure from the clean water Q which flows through the in-pipe flow path 3 in a continuous flow state. Even if pressed so as to move to the downstream side, the outer surface of the bag outer mounting member 4f of the cap member 4A is in sliding contact with the inner surface 50a of the shaft core adjusting cylinder member 50, and the outer surface of the shaft core adjusting cylinder member 50 is Since the sliding bag 4 is in sliding contact with the inner surface of the insertion guide tube 22, the closing bag 4 does not come into contact with the burrs on the inner surface of the perforation port 2, the projections on the inner surface of the branch pipe portion B, and the like. It can be kept concentric with the core Y.

Subsequently, as shown in FIG. 6, the supply valve 31 a is opened, and a predetermined amount of the diameter-enlarging fluid P is passed through the supply passage 31, the flow passage 30 </ b> A and the fluid intake / exhaust passage 4 c. The bag main body 4B is elastically expanded and deformed in the direction of the tube axis X of the water pipe 1 and radially outward. When the bag body 4B is elastically expanded and deformed to have a substantially cylindrical shape, the bag body 4B has a larger cylinder diameter on a plane including the longitudinal direction of the fitting tube portion 4a (longitudinal direction of the tube shaft 30). In the direction perpendicular to the plane including the longitudinal direction of the fitting cylinder portion 4a, the cylinder is expanded and deformed so that the height of the cylinder increases.
Thus, when the bag main body 4B is elastically expanded and deformed at the in-pipe flow path blocking position, the outer peripheral surface of the bag main body 4B closes the inner peripheral side peripheral portion of the perforation port 2 on the inner peripheral surface of the water pipe 1. While closing the in-pipe flow path 3 of the pipe 1, it is located in the outer peripheral surface of the bag main body 4B (blocking bag 4) on the both sides of the fitting cylinder part 4a (cylinder axis | shaft 30) in the pipe axis X direction of the water pipe 1. The annular seal part 4i provided in the location presses the inner peripheral surface of the water pipe 1 over the entire circumference in the circumferential direction. When the closing bag 4 is sufficiently elastically expanded and deformed, the supply valve 31a is closed.

Thereby, as shown in FIG. 7, even if the fluid pressure of the clean water Q flowing through the water pipe 1 acts on the closed bag 4, the shaft adjusting cylinder member 50 is closed as described above. 4 is maintained concentrically with the axial center Y of the branch pipe portion B to prevent the closing bag 4 from moving from the closed position of the in-tube flow path, 2 can be prevented from being damaged by contact with burrs on the inner surface of the tube 2 or protrusions on the inner surface of the branch pipe portion B, and the deformation and movement of the blocking bag 4 can be reduced, so Variation in the degree can be prevented.
Further, even in an uninterrupted state, the elastic bag is simply elastically deformed and deformed by inserting the closed bag 4 inserted in the pipe flow path closed position and maintained concentric with the axis Y of the branch pipe part B by the axis adjustment cylinder member 50. In addition to being able to close the perforation port 2 and the in-pipe flow path 3 easily and reliably, the closed bag 4 is located downstream of the water pipe 1 due to friction between the annular seal portions 4 i and the inner peripheral surface of the water pipe 1. Can be further prevented, and fluctuations in the degree of close contact with the inner peripheral surface of the in-tube flow path 3 can be further prevented.

  Next, when work such as replacement of a fire hydrant is completed on the downstream side of the location where the in-pipe flow path 3 is closed by the closure bag 4, the discharge valve 32a is opened as shown in FIG. The fluid P for expanding the diameter in 4B is discharged to the outside through the fluid suction / discharge passage 4a, the flow passage 30A, and the discharge passage 32, and the bag body 4B is moved in the direction of the pipe axis X of the water pipe 1 and inward in the radial direction. Reduce to the side. This discharge may be forcibly sucked by a pump or the like, or may be configured to open to the atmosphere.

When the closure bag 4 is reduced, the operation lever 43 of the push-in operation means 40 is operated to release the position of the chain 41 in the tightened state, and the cylinder shaft 30 is moved to the axis of the branch pipe portion B by a crane or the like (not shown). Remove along Y.
In addition, by releasing the position holding of the chain 41 in the tightened state by the operation lever 43 of the pushing operation means 40, the cylindrical shaft 30 is made to branch by the fluid pressure of the clean water Q flowing through the in-tube flow path 3. However, it is not necessary to use a crane or the like, but a crane or the like may be used in combination for safety.

  As shown in FIG. 9, when the cylindrical shaft 30 is removed, the cylindrical shaft 30 moves relative to the sealed case 20, but the closed bag 4 fixed to the distal end portion 30 </ b> B of the cylindrical shaft 30 and the shaft core adjustment. The cylinder shaft 30, the closing bag 4, the shaft core adjusting cylinder member 50, and the insertion guide cylinder 22 are integrally formed in the axis of the branch pipe portion B without moving relative to the cylinder member 50 and the insertion guide cylinder 22. It moves to the sealed case 20 side along Y. That is, the closing bag 4 is moved from the insertion guide tube 22 (the state is not accommodated in the insertion guide tube 22), and the shaft core adjusting cylinder member 50 is positioned in the vicinity of the distal end portion in the insertion guide tube 22. In this state, the insertion guide cylinder 22 and the closing bag 4 move in the branch pipe part B and in the sealed case 20 along the axis Y of the branch pipe part B.

  As shown in FIG. 10, the upper surface of the insertion position restricting convex portion 30 </ b> D is in a state where the lower surface of the insertion position restricting convex portion 30 </ b> D of the cylindrical shaft 30 is in contact with the outer surface of the bottom wall portion 22 b of the insertion guide tube 22. When abutting against the inner surface of the bottom wall portion 20 b of the sealed case 20, the entire insertion guide tube 22 and the closed bag 4 are completely accommodated in the internal space 21 of the sealed case 20. It should be noted that the insertion guide tube 22 and the entire closure bag 4 are not completely accommodated in the internal space 21 of the sealed case 20, that is, the tip (part) of the closed bag 4 extends from the internal space 21 of the sealed case 20. The state which protrudes and is located in the position which does not interfere with the valve body 7C in the cylindrical part 7a of the gate valve 7 may be sufficient.

  Thereafter, the valve body 7C is closed to release the tightening connection between the bolt 12 and the nut 13, and the connection flange portion 20A of the sealing case 20 in which the insertion guide tube 22 and the closing bag 4 are accommodated in the internal space 21 is removed. Then, it is removed from the connecting flange portion 7B of the gate valve 7.

  As a result, the cylinder shaft 30 is moved from the insertion guide cylinder 22 by pushing the cylinder shaft 30 so that the cylinder shaft 30 is moved from the insertion guide cylinder 22 to a predetermined in-tube flow path closing position. Even when the closing bag 4 is not accommodated in the insertion guide tube 22 when extracted along the axis Y of the part B, the insertion guide tube 22 and the closing bag 4 are inside the internal space 21 formed in the sealed case 20. The sealed case 20 can be detached from the branch pipe portion B in a state where the insertion guide cylinder 22 and the closing bag 4 are completely accommodated in the internal space 21 of the sealed case 20. Therefore, it is possible to satisfactorily prevent the blocking bag 4 from being damaged by coming into contact with an object or the like when the sealed case 20 is detached, carried out, transported, or the like.

  Therefore, when the closure bag 4 is inserted into the in-pipe flow path 3 through the perforation port 2, it does not contact or get caught by burrs or the like of the perforation port 2 or projections of the branch pipe portion B. Since it does not contact an object or the like when it is accommodated in 20 and detached, it can be reused well without being damaged or damaged.

  Next, as shown in FIG. 11 and FIG. 12, after the perforation port 2 is sealed with the inner plug 60 using the inner plug insertion machine G, the sealing step of sealing the valve mounting port 6 with the lid 61 is performed. .

  As shown in FIG. 11, the inner plug insertion machine G includes a connecting flange portion 70 </ b> A that is detachably tightened and connected to the connecting flange portion 7 </ b> B of the gate valve 7 through bolts 12 and nuts 13 in a watertight state. A bottomed cylindrical case portion 70, an outer shaft 71 slidably penetrating the bottom wall portion of the case portion 70 while maintaining a watertight state, and an inner shaft 72 inserted through the outer shaft 71, A pair of fixing rods 73 disposed at the rear end portion of the outer shaft 71, a handle 74 disposed at a rear side of the rear end portion of the inner shaft 72 from the fixing rod 73 of the outer shaft 71, and a connecting flange A pair of fixing rings 75 disposed in the portion 70 </ b> A, a pair of fixing rods 73, and a pair of chains (or wires, etc.) 76 spanned between the pair of fixing rings 75 are configured.

An inner plug 60 is detachably attached to the distal ends of the outer shaft 71 and the inner shaft 72.
The inner plug 60 includes a cylindrical main body portion 60a, an attachment portion 60b that is connected to the distal end portion of the inner shaft 72 and is provided on the upper portion of the main body portion 60a, and is provided on the outer peripheral portion of the main body portion 60a. An annular diameter-expanding elastic member 60c that can be expanded and deformed, and a diameter-enlarging mechanism (not shown) that expands and deforms the diameter-expanding elastic member 60c in accordance with the relative rotation operation of the inner shaft 72 in the inner plug insertion machine G. A fixing mechanism (not shown) for positioning and fixing the inner plug 60 to the inner peripheral surface side peripheral portion of the perforation port 2 in the inner peripheral surface of the water pipe 1 in accordance with the relative rotation operation of the inner shaft 72 in the inner plug insertion machine G; It is configured with. The outer diameter of the main body 60 a of the inner plug 60 is slightly smaller than the inner diameter of the perforation port 2.

Therefore, in the sealing step, first, the connecting flange portion 70A of the inner plug insertion machine G is attached to the bolt 12 with the inner plug 60 being attached to the outer shaft 71 and the inner shaft 72 of the inner plug insertion machine G via the mounting portion 60b. -It connects and fixes to the connection flange part 7B of the gate valve 7 through the nut 13. Then, after opening the valve body 7C of the gate valve 7, the pair of chains 76 are wound around the tightening side by a lever block or the like (not shown), and the outer shaft 71 and the inner shaft 72 are connected to the branch pipe portion. A position corresponding to the perforation port 2 in the radial direction of the water pipe 1 by sliding the inner plug 60 disposed at the distal ends of the outer shaft 71 and the inner shaft 72 along the axis B of the pipe to the inner flow path 3 side. To be located. Thereafter, the handle 74 disposed at the rear end portion of the inner shaft 72 is operated to relatively rotate, so that the inner plug 60 is placed on the inner peripheral surface side peripheral portion of the perforation port 2 on the inner peripheral surface of the water pipe 1 by a fixing mechanism. By positioning and fixing, and further rotating the handle 74 relative to each other, the diameter-expanding elastic member 60c is expanded and deformed radially outward by the diameter-expanding mechanism, and the diameter-expanding elastic member 60c is pressed against the perforation port 2.
Accordingly, the inner plug 60 can be fixed to the perforation port 2 and the perforation port 2 can be closed in a sealed state.

Subsequently, the connection between the mounting portion 60 b of the inner plug 60 and the inner shaft 72 is released, the outer shaft 71 and the inner shaft 72 are accommodated in the case portion 70, and the fastening connection of the bolt 12 and the nut 13 is released. Then, after removing the inner plug insertion machine G from the connection flange portion 7B of the gate valve 7, the bolt 10 and the nut 11 are released from being tightened and engaged with the annular groove 6c of the valve mounting opening 6. The gate valve 7 is removed from the connecting flange portion 6 b in the pipe portion 6 a of the valve mounting opening 6.
The gate valve 7 may be removed at the same time as the inner plug mounting machine G is removed.

Further, in the sealing step, as shown in FIG. 12, the lid 61 is connected and fixed in a sealed state to the connecting flange portion 6 b of the tube portion 6 a of the valve mounting port portion 6 with bolts 12 and nuts 13.
The lid 61 includes a flat plate-like main body portion 61a, a cylindrical portion 61b that protrudes in a circular shape from the lower surface of the main body portion 61a, and a connecting flange portion 61c that extends radially outward from the outer peripheral portion of the cylindrical portion 61b. I have.
Specifically, the coupling flange portion 61c and the coupling flange between the valve mounting port portion 6 in a state where the cylindrical portion 61b is fitted in the annular concave groove 6c of the valve mounting port portion 6 via a seal member (not shown). The part 6b is connected and fixed by a bolt 12 and a nut 13.
Thereby, the valve mounting opening 6 can be sealed in a state in which the perforated port 2 is sealed with the inner plug 60 and further in a state of surrounding the inner plug 60.

  Therefore, since the gate valve 7 can be removed in the sealing process, the gate valve 7 can be used at other construction sites, and the construction cost can be reduced. Can be simplified.

[Another embodiment]
(A) In the above-described embodiment, the stepped portion 22A in which the inner diameter side portion 22f projects from the outer diameter side portion 22e of the insertion guide tube 22 to the distal end side is provided at the distal end portion of the insertion guide tube 22, and the contact posture , The insertion guide tube 22 is in a state in which at least a part of the outer diameter side portion 22e of the step portion 22A abuts the outer surface side peripheral edge portion 2a and at least a part of the inner diameter side portion 22f is fitted into the perforation port 2. Although configured as described above, other configurations can be adopted.
For example, as shown in FIG. 13, the step portion 22A is omitted, and the cylindrical wall portion 22a of the insertion guide tube 22 has a constant inner diameter and outer diameter in the direction along the axis Y of the branch pipe portion B (thickness is reduced). (Constant). The outer diameter of the cylindrical wall portion 22a is larger than the inner diameter of the perforation port 2 and smaller than the inner diameter of the cylindrical portion 7a of the gate valve 7 and the inner diameter of the pipe portion 6a of the valve mounting port portion 6. Then, the inner diameter of the cylindrical wall portion 22 a is configured to be larger than the outer diameter of the shaft adjusting cylinder member 50 and smaller than the inner diameter of the perforation port 2, and the insertion guide cylinder 22 is sealed together with the cylindrical shaft 30. A contact posture in which the distal end surface 22P of the insertion guide tube 22 contacts the outer peripheral edge 2a of the perforation port 2 by moving along the axis Y of the branch tube portion B in the inner tube and the branch tube portion B. It can also be configured.
In this abutting posture, the inner surface of the cylindrical wall portion 22a of the insertion guide tube 22 is located on the inner side (on the axis Y side of the branch pipe portion B) than the inner surface of the perforation port 2, so When the closed bag 4 is inserted, the closed bag 4 does not come into contact with the perforation port 2.
Note that the inner diameter of the cylindrical wall portion 22 a of the insertion guide cylinder 22 may be configured to be the same as the inner diameter of the perforation port 2.

(B) In the above embodiment, a perforation port (an example of a branch port) 2 is perforated on the outer peripheral surface of the water pipe 1 by a perforation device, and the closure bag 4 is inserted through the perforation port 2. It is good also as a structure which inserts the obstruction | occlusion bag 4 through the branch port 2 currently formed in the outer peripheral surface of the pipe | tube 1. As shown in FIG.
For example, as shown in FIG. 14, the valve mounting port portion (an example of the mounting port portion) 6 is formed integrally with the water pipe 1 in a state where it communicates with the branch port 2 formed in advance on the outer peripheral surface of the water pipe 1. It is good also as a structure which inserts the obstruction | occlusion bag 4 through the said branch port 2. FIG.

Specifically, the gate valve (an example of a valve member) 7 is configured such that the upstream end of the tubular portion 7a of the gate valve 7 is connected to the annular groove of the valve mounting port 6 via an O-ring (not shown). In the watertight state engaged with 6c, the connecting flange portion 7A on the upstream side of the gate valve 7 is tightened and connected to the connecting flange portion 6b of the pipe portion 6a of the valve mounting port 6 by the bolt 10 and the nut 11. The valve mounting port 6 and the gate valve 7 function as the branch pipe portion B.
And the cylindrical wall part 22a of the insertion guide cylinder 22 comprised so that an internal diameter and an outer diameter may become constant (thickness is constant) in the direction along the axial center Y of the branch pipe part B, the outer diameter of the gate valve 7 The inner diameter of the cylindrical portion 7a is slightly smaller than the outer diameter of the cylindrical wall portion 50b of the shaft adjusting cylinder portion 50, and the cylindrical shaft 30 is connected to the branch pipe portion B. When slid along the axis Y, the cylinder shaft 30 moves with the insertion guide cylinder 22 in a state of moving relative to the sealing case 20 and not relative to the insertion guide cylinder 22, so that the insertion guide At least a part of the distal end portion of the tube 22 is in a contact posture in contact with the annular concave groove 6 c of the valve mounting port portion 6. Here, the location where the distal end portion of the insertion guide cylinder 22 contacts the annular groove 6c is radially inward from the location where the upstream end of the tubular portion 7a of the gate valve 7 contacts the annular groove 6c. It is a location located on the side, and this location functions as a contacted portion formed in the valve mounting opening 6. In other words, the annular groove 6c is configured to have a width capable of abutting and supporting the tubular portion 7a of the gate valve 7 and the distal end portion of the insertion guide tube 22 in the radial direction of the tube portion 6a of the valve mounting port portion 6. Has been. In the other embodiment, the inner surface 22a of the insertion guide tube 22 is slightly more than the inner diameter of the tube portion 6a of the valve mounting port 6 in the contact posture in which the distal end portion of the insertion guide tube 22 contacts the annular groove 6c. Also, the outer surface of the shaft adjusting cylinder member 50 is slidably contacted with the inner surface 22 a of the insertion guide cylinder 22.
Further, when the tube shaft 30 is further slid along the axis Y of the branch pipe portion B toward the in-tube flow path 3 side in a state where the insertion guide tube 22 is in the abutting posture, the blocking bag 4 flows into the in-tube flow. In the channel 3, the axial core adjusting cylinder member 50 is located at a desired position in the pipe flow path blocking position, and the axial core adjusting cylinder member 50 corresponds to the branch port 2 in the radial direction of the water pipe 1. The position where the tip of the shaft core adjusting cylinder portion 50 and the radially inner side end of the water pipe 1 at the branch port 2 are located at a position where the tip moves along the axis X direction and contacts the inner peripheral surface of the branch port 2. The water pipe 1 is located at the same position in the radial direction.
In the other embodiment, the contacted portion formed in the valve mounting port portion 6 is configured as a location where the distal end portion of the insertion guide cylinder 22 contacts the annular groove 6c of the valve mounting port portion 6. Other configurations can be adopted as the contacted portion as long as the portion is formed in the valve mounting opening 6 and at least a part of the distal end portion of the insertion guide tube 22 contacts. For example, the upper surfaces of protrusions (for example, two places in the circumferential direction) formed to protrude radially inward from the inner surface of the tube portion 6a of the valve mounting port portion 6 can be configured as the contacted portion. .

(C) In the above embodiment, the water pipe 1 through which the clean water Q as a fluid flows is exemplified as the fluid pipe. However, the fluid may be liquid or gas, and the fluid pipe may be liquid or gas. The pipe | tube which can flow may be sufficient.

(D) In the above embodiment, the shaft adjusting cylinder member 50 as the shaft adjusting portion is fixed to the distal end portion 30 </ b> B of the tube shaft 30 located in the insertion guide tube 22, but is positioned in the insertion guide tube 22. It can also be fixed to the base end portion of the closing bag 4 (for example, the bag outer mounting member 4f of the cap member 4A).
Other configurations can be adopted as the shaft core adjusting portion as long as it is not a bottomed cylindrical shaft core adjusting tube member 50 but a member having a shape capable of sliding contact with the inner surface of the insertion guide tube 22.

(E) In the above embodiment, a lever block is employed as the pushing operation means 40. However, any other configuration can be used as long as it can push the cylindrical shaft 30 against the fluid pressure from the pipe flow path 3. Can be adopted.

(F) In the above-described embodiment, the sealed case 20 includes the internal space 21 having a length capable of accommodating the insertion guide cylinder 22 and the closed bag 4 in a state moved from the insertion guide cylinder 22. With the lower surface of the insertion position restricting convex portion 30D in contact with the outer surface of the bottom wall portion 22b of the insertion guide cylinder 22, the upper surface of the insertion position restricting convex portion 30D contacts the inner surface of the bottom wall portion 20b of the sealing case 20. Then, the insertion guide tube 22 and the entire closure bag 4 are placed in the internal space 21 of the sealed case 20 in a state in which the front end of the closed bag 4 is positioned at substantially the same position as the connecting flange portion 20 </ b> A in the internal space 21 of the sealed case 20. Although configured to be completely accommodated, the length of the sealed case 20 can be changed as appropriate.
For example, when the length of the sealing case 20 is accommodated in the internal space 21 of the sealing case 20 with the insertion guide cylinder 22 and the closing bag 4 moved from the insertion guide cylinder 22, the insertion position restriction projection of the cylinder shaft 30 is accommodated. In the state where the lower surface of the portion 30D is in contact with the outer surface of the bottom wall portion 22b of the insertion guide cylinder 22 and the upper surface of the insertion position regulating convex portion 30D is in contact with the inner surface of the bottom wall portion 20b of the sealing case 20. The front end (part) of the bag 4 can be formed so as to protrude from the internal space 21 of the sealed case 20. That is, the closure bag 4 can be formed so as not to be completely accommodated in the internal space 21.
Further, for example, when the length of the sealed case 20 is stored in the internal space 21 of the sealed case 20 with the insertion guide tube 22 and the closed bag 4 moved from the insertion guide tube 22, the insertion position of the tube shaft 30 is stored. When the lower surface of the restricting convex portion 30D comes into contact with the outer surface of the bottom wall portion 22b of the insertion guide cylinder 22, and the upper surface of the insertion position restricting convex portion 30D comes into contact with the inner surface of the bottom wall portion 20b of the sealing case 20, the blocking With the front end of the bag 4 positioned in a position that is biased to the bottom wall portion 20b side of the connecting flange portion 20A in the internal space 21 of the sealed case 20, the entire insertion guide tube 22 and the closed bag 4 are It is also possible to form a length that is completely accommodated in the internal space 21.

  As described above, in the continuous flow state in which the fluid flow in the in-tube flow path of the fluid pipe is maintained, the insertion of the closing bag inserted into the in-tube flow path is facilitated and the breakage is prevented. It is possible to provide a continuous flow type flow path closing device that can reliably close the channel.

1 Water pipe (fluid pipe)
1a Outer peripheral surface 2 Perforated port (branch port)
2a Outer surface side peripheral edge part 3 In-pipe flow path 4 Closure bag 4i Annular seal part 4A Base member 4f Bag outer mounting member (base member)
6 Valve mounting port (mounting port)
6c Annular groove (contacted part)
7 Gate valve (valve member, branch pipe)
7C Valve body 20 Sealed case 21 Internal space 22 Insertion guide cylinder 22c Inner surface 22e Outer diameter side part (step part)
22f inner diameter side part (step)
22A Stepped portion 30 Tube shaft (shaft)
30A Flow path 30B Tip part 30D Insertion position control convex part (insertion position control means)
40 Push-in operation means 50 Shaft core adjusting cylinder member (shaft core adjusting section)
50a Inner surface A Channel blockage device B Branch pipe part P Diameter expansion fluid Q Water supply (fluid)
X tube axis Y axis

Claims (9)

A continuous flow type flow path closing device provided with a closed bag that is inserted into the fluid pipe through a branch port formed in the fluid pipe and expands and deforms toward the diameter expansion side to close the flow path in the fluid pipe. Because
A sealed case detachably connected to a branch pipe portion having a valve member communicating with the branch port;
An insertion guide tube fitted in the sealed case;
Over the sealing case and the insertion guide cylinder, a shaft that is slidably penetrated along the axis of the branch pipe portion while maintaining a sealed state, and has a passage provided inside,
The closed bag fixed at the tip of the shaft located in the insertion guide cylinder and elastically deformable to the diameter expansion side by the diameter expansion fluid supplied through the flow path; and
A pushing operation means for pushing and moving the shaft against the fluid pressure in the fluid pipe;
An axial center adjustment portion fixed to a distal end portion of the shaft located in the insertion guide tube or a proximal end portion of the closing bag and capable of sliding contact with an inner surface of the insertion guide tube;
The insertion guide cylinder accommodated in a state in which the closing bag is contracted in the insertion guide cylinder is configured such that at least a part of the distal end portion of the insertion guide cylinder is formed on the outer peripheral surface of the fluid pipe by the pushing operation means. It is configured to be movable in the sealed case and in the branch pipe portion along the axial center of the branch pipe portion until it comes into contact with the outer peripheral edge of the branch port.
The closing bag accommodated in the insertion guide cylinder in the abutting position is moved by the pushing operation means from the insertion guide cylinder through the branch port along the axis of the branch pipe portion. The axial core adjusting portion is connected to the branch port in the radial direction of the fluid pipe while being configured to be freely inserted into the pipe flow path of the pipe and in the state where the closing bag is located at a predetermined pipe flow path closing position. An uninterrupted flow path blocking device configured to be located at a corresponding location. The distal end portion of the insertion guide tube includes a stepped portion in which an inner diameter side portion protrudes from the outer diameter side portion of the insertion guide tube toward the distal end side,
The insertion guide tube in the abutting posture is in a state in which at least a part of the outer diameter side part is brought into contact with the outer peripheral edge and at least a part of the inner diameter side part is fitted in the branch port. The continuous flow type flow path closing device according to claim 1, wherein the flow path closing apparatus is configured to be capable of being positioned. A continuous flow type flow path closing device provided with a closed bag that is inserted into the fluid pipe through a branch port formed in the fluid pipe and expands and deforms toward the diameter expansion side to close the flow path in the fluid pipe. Because
A sealed case detachably connected to the branch pipe portion having a mounting port portion integrally formed with the fluid pipe in a state of communicating with the branch port and a valve member mounted to the mounting port portion;
An insertion guide tube fitted in the sealed case;
Over the sealing case and the insertion guide cylinder, a shaft that is slidably penetrated along the axis of the branch pipe portion while maintaining a sealed state, and has a passage provided inside,
The closed bag fixed at the tip of the shaft located in the insertion guide cylinder and elastically deformable to the diameter expansion side by the diameter expansion fluid supplied through the flow path; and
A pushing operation means for pushing and moving the shaft against the fluid pressure in the fluid pipe;
An axial center adjustment portion fixed to a distal end portion of the shaft located in the insertion guide tube or a proximal end portion of the closing bag and capable of sliding contact with an inner surface of the insertion guide tube;
In the insertion guide cylinder accommodated in a state where the closure bag is contracted in the insertion guide cylinder, at least a part of the distal end portion of the insertion guide cylinder is formed in the mounting opening by the pushing operation means. It is configured to be movable in the sealed case and the branch pipe part along the axis of the branch pipe part until it comes into a contact posture to contact the contacted part,
The closing bag accommodated in the insertion guide cylinder in the abutting position is moved by the pushing operation means from the insertion guide cylinder through the branch port along the axis of the branch pipe portion. The axial core adjusting portion is connected to the branch port in the radial direction of the fluid pipe while being configured to be freely inserted into the pipe flow path of the pipe and in the state where the closing bag is located at a predetermined pipe flow path closing position. An uninterrupted flow path blocking device configured to be located at a corresponding location. The shaft core adjusting portion is configured by an shaft core adjusting cylinder member formed to have an outer diameter substantially the same as the inner diameter of the insertion guide cylinder,
A base end portion of the closure bag is provided with a base member that includes a fluid supply / discharge path communicating with the flow path and has an outer surface that can be slidably contacted with an inner surface of the shaft core adjusting cylinder member. The continuous flow type flow path closing device according to any one of claims 1 to 3, wherein the flow path closing apparatus is disposed so as to be fitted into the shaft adjusting cylinder member.   In a state where the closing bag is located at the in-tube flow path closing position, the distal end of the shaft core adjustment portion and the radially inner side end of the fluid pipe at the branch port are in the radial direction of the fluid pipe. The continuous flow type flow path closing device according to any one of claims 1 to 4, which is configured to be positioned at the same position.   The outer circumferential surface of the shaft is brought into contact with the bottom outer surface of the insertion guide cylinder in the contact posture as the shaft is pushed by the pushing operation unit, and the closed bag is inserted into the fluid pipe. 6. An uninterruptible flow according to any one of claims 1 to 5, wherein an insertion position restricting means for restricting so as to be in the in-pipe flow path blocking position is formed to protrude radially outward of the shaft. Road closure device.   The said airtight case is provided with the interior space which has the length which can accommodate the said obstruction | occlusion bag of the state which moved from the said insertion guide cylinder and the said insertion guide cylinder at least. The continuous flow type channel closing device as described.   After the closing bag is inserted into the in-tube flow path closing position in the in-tube flow path of the fluid pipe along the axial center of the branch pipe portion, the closed side of the fluid pipe in the axial direction and the radially outward side The fluid pipe is configured so as to be elastically expandable and deformable, and in the state where the inner peripheral side of the branch port on the inner peripheral surface of the fluid pipe is closed, The continuous flow type flow path closing device according to any one of claims 1 to 7, which is configured to be closed.   On the outer peripheral surface of the closing bag, the portions located on both sides of the shaft in the tube axis direction are all circumferentially with respect to the inner peripheral surface of the fluid pipe when the closing bag is elastically expanded and deformed. The continuous flow type flow path closing device according to claim 8, wherein an annular seal portion that presses the circumference and frictionally holds the closing bag is provided.

Images