JP2013124720A - Pipe unit having gate valve mounting part and branch pipe connecting part and method for installing branch pipeline using the pipe unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe unit having a gate valve mounting part and a branch pipe connecting part used for an earthquake-resistant pipeline to be newly laid and an earthquake-resisting replacement pipeline for an existing pipe with which a work amount when changing a flow passage in a continuously flowing state is reduced, and a method of installing a branch pipeline using the pipe unit.SOLUTION: The pipe unit 3 suitable for construction in a continuous flowing state is connected to fluid pipes 1, 2 and includes a fluid passage 4 communicated with the fluid pipes 1, 2, and connecting parts 8a, 8b connected to the fluid pipes 1, 2. The fluid passage 4 is provided with at least two branch passages, and out of the two branch passages, a first branch passage 5 includes a flange 9 for mounting a gate valve 60 and a simple opening and closing valve 10 for opening and closing the first branch passage 5, and a second branch passage 6 includes a flange 11 for connecting a branch pipe 80 and a shut-off valve 12 for shutting off the second branch passage 6.

Description

  The present invention relates to a pipe unit suitable for construction in an uninterrupted flow state equipped with a gate valve mounting part and a branch pipe connecting part used for a newly installed earthquake resistant pipe, an earthquake resistant laying replacement pipe of an existing pipe, and the like. It is related with the installation method of the used branch pipeline.

  Conventionally, when changing the flow path in the state of uninterrupted flow, between the pipe end portions of the pipe joint body divided vertically, for inserting a shut-off valve vertically through the pipe axis of the fluid pipe A bottomed cylindrical valve housing with an open top, a short cylindrical branch pipe receiving section perpendicular to the pipe axis of the fluid pipe on the side of one pipe end, and the end of each pipe end There is a type that uses a branch pipe joint for changing a flow path provided with an inner flange whose diameter can be increased by cutting on the inner surface of the part and a packing mounting groove for fitting the packing outside the inner flange.

  Then, the pipe joint main body divided vertically is joined from above and below around the fluid pipe at the location where the flow path is changed, and the inner surface of the inner casing extends along the outer surface of the fluid pipe. The joint surface is fixed to the fluid pipe by welding, etc., the packing is fitted into the packing mounting groove, the fluid pipe in the valve housing is cut so as to cut longitudinally, a shut-off valve is fitted into this cut portion, and the branch pipe A diversion hole is drilled in the fluid pipe through the passage receiving section, the branch conduit is connected to the branch pipe receiving section, the fluid pipe near the pipe end on the downstream side of the pipe joint body is cut, and a closing lid is attached. What was made into is known (for example, refer patent document 1).

  On the other hand, as a gate valve device that can easily cope with a shallow embedding depth, a main pipe portion that is not divided in the circumferential direction while a fluid flows and a branch pipe portion that projects so as to branch upward from the main pipe portion are provided. A T-shaped pipe, an on-off valve provided on the branch pipe section for opening and closing the branch pipe section, a valve lid joined to an upper end of the branch pipe section, and an on-off valve in the valve lid and the branch pipe section By including a partition valve body that is accommodated on the valve lid side and closes the fluid that flows through the main pipe section and flows into the main pipe section, and by joining the valve lid only when it is necessary to shut off the flow path, There is known one that can easily cope with a shallow embedding depth (for example, see Patent Document 2).

Japanese Utility Model Publication No. 60-3430 (2nd page, Fig. 4) JP 2001-27349 A (page 3, FIG. 2)

  However, in Patent Document 1, a pipe joint main body divided into upper and lower parts is attached to the location where the flow path is changed each time, the fluid pipe is cut so as to run vertically, and a shut-off valve is inserted into the cut portion. In addition, since it is necessary to make a diverting hole in the fluid pipe through the branch pipe receiving portion, there is a problem that the amount of work is large and rush work is forced in an emergency case.

  In Patent Document 2, a main pipe part, a branch pipe part protruding so as to branch upward from the main pipe part, an on-off valve that opens and closes the branch pipe part, and a branch pipe are previously provided in the fluid pipe. A T-shaped tube with a valve lid joined to the upper end of the tube part is connected, and only when it is necessary to shut off the flow path, a gate valve body that closes the fluid flowing in the main pipe part is attached. However, only the gate valve device provided in the fluid pipe can be easily adapted to the shallow embedment depth, and the technical idea for changing the flow path in the state of uninterrupted flow is not disclosed. Absent.

  The present invention has been made paying attention to such problems, and it is possible to reduce the amount of work when changing the flow path in the state of uninterrupted flow. It aims at providing the installation method of the branch line using the pipe unit provided with the gate valve installation part and branch pipe connection part which are used for an exchange pipe etc., and a pipe unit.

In order to solve the above problems, a pipe unit including a gate valve mounting portion and a branch pipe connecting portion according to the present invention includes:
A pipe unit connected to a fluid pipe and having a fluid path communicating with the fluid pipe and a connection part connected to the fluid pipe, and suitable for construction in an unsteady flow state;
The fluid path is provided with at least two branch paths, and among the two branch paths, a first branch path includes a flange for mounting a gate valve and a simple opening and closing of the first branch path. An on-off valve is provided, and the second branch path is provided with a flange for connecting the branch pipe and a closing valve for closing the second branch path.
According to this feature, by providing at least two branch paths in the fluid path in advance, when changing the flow path in an uninterrupted flow state, the first branch path is blocked by the gate valve, Since the second branch path can communicate with another flow path, it is possible to reduce the amount of work when changing the flow path in an uninterrupted state.

The pipe unit provided with the gate valve mounting part and the branch pipe connection part of the present invention,
The first branch path is provided on the upstream side of the fluid path, and the second branch path is provided on the downstream side.
According to this feature, it can be used as a downstream pipe unit in the case of changing the flow path in a continuous flow state. In addition, by using this pipe unit in combination with a pipe unit provided with a second branch path on the upstream side of the fluid path and a first branch path on the downstream side, the pipe unit can be flown in a continuous flow state. The road can be changed.

The pipe unit provided with the gate valve mounting part and the branch pipe connection part of the present invention,
The second branch path is provided on the upstream side of the fluid path, and the first branch path is provided on the downstream side.
According to this feature, it can be used as a tube unit on the upstream side when the flow path is changed in a state of uninterrupted flow. In addition, when this pipe unit is used in combination with a pipe unit provided with a first branch path on the upstream side of the fluid path and a second branch path on the downstream side, the pipe unit can be used in a continuous flow state. The road can be changed.

The pipe unit provided with the gate valve mounting part and the branch pipe connection part of the present invention,
The second branch path is provided on the upstream side and the downstream side of the fluid path, and the first branch path is provided between the two second branch paths.
According to this feature, it can be used as both the upstream and downstream pipe units when the flow path is changed in a continuous flow state. Moreover, since only the same pipe unit needs to be manufactured, the types of pipe units can be reduced.

The pipe unit provided with the gate valve mounting part and the branch pipe connection part of the present invention,
The first branch path is provided on the upstream side and the downstream side of the fluid path, and the second branch path is provided between the two first branch paths.
According to this feature, it can be used as both the upstream and downstream pipe units when the flow path is changed in a continuous flow state. Moreover, since only one pipe unit needs to be manufactured, the number of pipe units can be reduced.

The pipe unit provided with the gate valve mounting part and the branch pipe connection part of the present invention,
The second branch path is characterized in that a gate valve can be mounted on the downstream side of the shut-off valve that closes the second branch path.
According to this feature, it is possible to easily perform the operation of removing the closing valve for closing the second branch path in the branch pipe connection work.

The installation method of the branch pipe line using the pipe unit of the present invention is:
A branch pipe installation method using a pipe unit connected to a fluid pipe and having a fluid path communicating with the fluid pipe and a connection unit connected to the fluid pipe and suitable for construction in an uninterrupted flow state,
The fluid path is provided with at least two branch paths, and among the two branch paths, a first branch path includes a flange for mounting a gate valve and a simple opening and closing of the first branch path. An on-off valve is provided, and the second branch path is provided with a flange for connecting the branch pipe and a gate valve mounting part and a branch pipe connecting part provided with a closing valve for closing the second branch path. The pipe unit is previously installed at a desired location of the fluid pipe, and when the branch pipe is provided, a gate valve is attached to the first branch path, and the branch pipe is connected to the second branch path. It is characterized by doing so.
According to this feature, by providing at least two branch paths in the fluid path in advance, when changing the flow path in an uninterrupted flow state, the first branch path is blocked by the gate valve, Since the second branch path can communicate with another flow path, it is possible to reduce the amount of work when changing the flow path in an uninterrupted state.

The installation method of the branch pipe line using the pipe unit of the present invention is:
A tube unit provided with the second branch path on the upstream side and the first branch path on the downstream side, and provided with the first branch path on the upstream side and the second branch path on the downstream side. In combination with the provided pipe unit, a branch pipe is connected across the two second branch paths.
According to this feature, various pipe units can be used in appropriate combination when the flow path is changed in a continuous flow state.

(A) is a top view which shows the pipe unit provided with the gate valve mounting part and branch pipe connection part in Example 1, (b) is a sectional side view, and (c) is a front sectional view. It is a top view which shows the state which connected the pipe unit of the modification and the pipe unit shown in FIG. 1 to the flow-path pipe | tube while showing the modification of the pipe unit in Example 1. FIG. It is a top view which shows the pipe unit provided with the gate valve mounting part and branch pipe connection part in Example 2. (A) is a top view which shows the pipe unit provided with the gate valve mounting part and branch pipe connection part in Example 3, (b) is XX sectional drawing. It is a top view which shows the state which installed the branch pipe using the pipe unit provided with the gate valve mounting part and branch pipe connection part in Example 1. FIG. FIG. 6 is a YY sectional view of FIG. 5. It is ZZ sectional drawing of FIG. It is a figure explaining the removal method of the closing valve which closes the 2nd branch way, Comprising: It is a partial cross section figure which shows the state which connected the closing valve attachment / detachment apparatus to the pipe unit for gate valve installation. It is a figure explaining the removal method of the closing valve which closes the 2nd branch way, Comprising: It is a partial cross section figure which shows the state equipped with the moving means which moves a spindle back and forth. It is a figure explaining the removal method of the closing valve which closes a 2nd branch path, Comprising: It is a fragmentary sectional view which shows the state from which the stop valve was removed from the branch path with the spindle.

  EMBODIMENT OF THE INVENTION The form for implementing the installation method of the pipe unit provided with the gate valve mounting part and branch pipe connection part which concerns on this invention, and a branch unit using a pipe unit is demonstrated below based on an Example.

  A pipe unit including a gate valve mounting part and a branch pipe connection part according to the first embodiment will be described with reference to FIGS. 1 and 2. In the following description, the left side of FIGS. 1A, 1B and 2 is the upstream side of the fluid path, and the right side of the page is the downstream side.

  The pipe unit provided with the gate valve mounting portion and the branch pipe connecting portion according to the present invention is, for example, as shown in FIG. 1 (a), an insertion port that constitutes a fluid pipe that is buried substantially horizontally in the ground. It is a pipe unit connected between the pipe 1 and the receiving pipe 2, and is a pipe unit applied to, for example, a newly installed earthquake resistant pipe, an earthquake resistant laying replacement pipe of an existing pipe, or the like. The pipe unit 3 (hereinafter, simply referred to as “pipe unit 3”) provided with the both-end pipes 1 and 2 and the gate valve mounting part and the branch pipe connecting part is concrete, reinforced concrete, asbestos, ductile cast iron, Other fluid pipes such as waterworks made of cast iron, steel, vinyl chloride, polyethylene or polyolefin. When the pipe unit 3 is made of metal, a first branch path 5 and a second branch path 6 which will be described later are formed by a manufacturing method such as casting or rolling, and the pipe unit 3 is protected against rust from the fluid. As a rust prevention treatment to be performed, a coating layer (not shown) is formed of mortar or rust prevention paint. In this embodiment, the fluid in the fluid pipe is clean water, but the fluid flowing in the fluid pipe is not necessarily limited to clean water. For example, in addition to industrial water, sewage, etc., gas or liquid of gas or gas and liquid It may be a mixture.

  As shown in FIG. 1, the pipe unit 3 includes a fluid path 4 that communicates with the both-end pipes 1 and 2, and a first branch path 5 and a second branch path 6 that communicate with the fluid path 4. A tubular body 7 formed inside is provided. At the end of the tubular body 7 in which the fluid passage 4 is formed, on the side of the insertion tube 1, there is formed a connection portion 8 a having a receiving shape into which the insertion tube 1 can be inserted, and on the reception tube 2 side. An insertion-shaped connecting portion 8 b that can be inserted into the receiving tube 2 is formed at the end of the receiving tube 2. In the joint part of these connection parts 8a and 8b, the pipe body 7 and the both-end pipes 1 and 2 are connected in a sealed manner. The connecting portion may be configured only by the receiving shape or only by the insertion shape, or may be connected by providing a flange at the end, or a cut formed by cutting a predetermined portion of the tube unit, for example. It may be connected to a pipe end having a surface, and can be appropriately set according to the connection mode with the fluid pipe network. Further, in the joint portion of the connecting portions 8a and 8b described above, the tube body 7 and the two-end pipes 1 and 2 are connected by tightening with bolts and nuts using, for example, a push-out wheel for preventing separation and a seal member (not shown). Each may be sealed.

  A flange short pipe 16 is connected to the upper end surface of the flange portion 7 a projecting upward from the top of the tube body 7, and the fluid path 4 of the two branch paths provided in the tube body 7. The first branch path 5 located on the upstream side is formed inside the flange portion 7 a and the flange short pipe 16. A hinge-type simple opening / closing valve 10 for opening and closing the first branch passage 5 is provided inside the flange short pipe 16. The flange short pipe 16 is provided with a flange 9 for mounting a gate valve (to be described later) and A flange portion 13 connected to the tube body 7 is provided, and the flange portion 13 and the upper end surface of the flange portion 7a are tightened and connected with a bolt. The simple opening / closing valve 10 may be normally urged in a direction to close the first branch path 5 by an urging means such as a spring member (not shown) provided in the hinge portion.

  More specifically, in the short flange tube 16, the bolts that fasten the flange portion 13 and the flange portion 7a and the bolts that fasten the closing flange 14 and the flange 9 are arranged so as to be shifted from each other. Since these bolts can be prevented from interfering with each other, the extension of the flange short pipe 16 can be set short.

  Of the two branch paths provided in the pipe body 7, the second branch path 6 located downstream of the fluid path 4 extends in a direction perpendicular to the horizontal direction with respect to the extending direction of the pipe body 7. It is formed inside the extended portion 7b. The tube thickness of the extending portion 7b is a thick wall shape in advance, and the flange 11 is formed at the opening end of the extending portion 7b. Is formed. Bolt screw holes 11a communicating with the extending portion 7b in the radial direction are disposed in the flange 11 at a plurality of locations in the circumferential direction. Each bolt screw hole 11a has a tapered fixing bolt 11b whose tip is gradually reduced in diameter. Each can be screwed. Further, a branch pipe described later can be connected to the flange 11.

  Further, a closing valve 12 that is slightly smaller in diameter than the inner peripheral surface of the flange 11 and that seals the second branch path 6 in a sealing manner is inserted into the extending portion 7b from the opening end of the extending portion 7b. The seal portion 12a provided on the front surface in the insertion direction of the shut-off valve 12 can be pressed against the inner peripheral surface of the extended portion 7b with high sealing performance, and each fixing bolt 11b is screwed. This sealed state can be maintained by being inserted.

  The first branch path 5 and the second branch path 6 are respectively provided with closing flanges 14 and 15 that are closed from the outside. The first branch path 5 is not limited to being formed inside the flange portion 7a projecting upward from the pipe body 7, but may be formed in a direction communicating with the fluid path. Good. Similarly, the second branch path 6 is not limited to the one formed in the extending portion 7b extending in the direction perpendicular to the horizontal direction with respect to the extending direction of the tube body 7, and communicates with the fluid path. What is necessary is just to be formed in a direction.

  The tube unit 3 formed in this way can be used as the tube unit 3 on the downstream side in the case of changing the flow path in an uninterrupted state (see FIG. 5). Further, by using this pipe unit 3 in combination with the pipe unit 20 provided with the second branch path 6 on the upstream side of the fluid path 4 and provided with the first branch path 5 on the downstream side, The flow path can be changed in the state of uninterrupted flow. In the first embodiment, as shown in FIG. 1, the first branch path 5 is provided on the pipe body 7 via the flange 13, but may be provided integrally with the pipe body 7. Moreover, although the 2nd branch path 6 is integrally provided in the pipe body 7, it may be provided as a different body.

  FIG. 2 shows a modification of the pipe unit provided with the gate valve mounting part and the branch pipe connection part in Example 1, and the pipe unit of the modification and the pipe unit shown in FIG. 1 are connected to the flow path pipe. It is a figure which shows a state.

  2, the pipe unit 3 shown on the right side is the same as that shown in FIG. 1, and the pipe unit 20 (hereinafter simply referred to as “pipe unit 20”) having the gate valve mounting portion and the branch pipe connecting portion shown on the left side. ) Shows a modification thereof.

  That is, in the pipe unit 20 shown on the left side of FIG. 2, the arrangement of the first branch path 5 and the second branch path 6 among the two branch paths provided in the pipe body 7 is shown on the right side. The second branch path 6 is positioned upstream of the fluid path 4 and the first branch path 5 is positioned downstream. Further, the second branch path 6 in the pipe unit 20 opens in the same direction as the second branch path 6 of the pipe unit 3. Other configurations of the first branch path 5 and the second branch path 6 are the same as those in FIG. 1, and a detailed description thereof will be omitted.

  The tube unit 20 formed in this way can be used as the upstream tube unit 20 in the case where the flow path is changed in an uninterrupted state (see FIG. 5). In addition, the pipe unit 20 and the pipe unit 3 provided with the first branch path 5 on the upstream side of the fluid path 4 and the second branch path 6 on the downstream side are used in combination. The flow path can be changed in the flow state.

  In FIG. 2, the insertion tube 17 is connected to the upstream side of the tube unit 20 shown on the left side, and the tube unit 20 and the tube unit 3 shown on the right side are connected via the insertion tube 1. 3 is in a state in which the receiving pipe 2 is connected to the downstream side of the pipe 3, and the gate valve 20 and the first branch path 5 of the pipe unit 3 are in a state in which a later-described gate valve can be mounted via the flange 9. In addition, a branch pipe, which will be described later, can be connected to the second branch path 6 via the flange 11. Thus, when changing a flow path in the state of an uninterrupted flow, various pipe units 3 and 20 can be used in combination as appropriate.

  Here, when the flow path is changed in the state of uninterrupted flow, the closing flange 15 and the closing valve 12 of the second branch path 6 of each of the pipe unit 20 and the pipe unit 3 are removed and a branch pipe (not shown) is connected. Then, a gate valve (not shown) may be attached to each first branch path 5 of the pipe unit 20 and the pipe unit 3 to close the gate valve. Therefore, as in the past, each time the flow path is changed, a pipe joint body that is divided into upper and lower parts is attached, and the flow path pipe is cut so as to be cut vertically, and a partition valve is inserted into the cut portion to branch. Since it is not necessary to perform a work of making a flow dividing hole in the flow path pipe through the pipe receiving part, it is possible to reduce the amount of work when changing the flow path in the state of uninterrupted flow.

  Next, a pipe unit including a gate valve mounting part and a branch pipe connection part according to the second embodiment will be described with reference to FIG. In addition, description is abbreviate | omitted about the structure which is the same structure as the said Example 1 and overlaps.

  The pipe unit 30 (hereinafter, simply referred to as “pipe unit 30”) including the gate valve mounting portion and the branch pipe connecting portion according to the second embodiment is provided on the upstream side and the downstream side of the fluid path. The branch paths 6 and 6 are configured such that the first branch path 5 is provided between the two second branch paths 6 and 6. The configurations of the first branch path 5 and the second branch path 6 are the same as those of the first embodiment shown in FIG.

  According to this configuration, the pipe unit 30 can be used as both the upstream and downstream pipe units when the flow path is changed in an uninterrupted state. That is, a branch pipe is connected to the second branch path 6 on the upstream side of the pipe unit 30 and the pipe unit 30 on the upstream side of the fluid path is connected to the downstream side of the fluid path. A branch pipe may be connected to the pipe unit 30 to the second branch path 6 on the downstream side of the pipe unit 30.

  For this reason, since it is only necessary to manufacture and prepare the same tube unit 30, the types of tube units can be reduced.

  Next, a pipe unit provided with a gate valve mounting part and a branch pipe connection part according to Example 3 will be described with reference to FIG. In addition, description is abbreviate | omitted about the structure which is the same structure as the said Example 1 and overlaps.

  The pipe unit 40 (hereinafter, simply referred to as “pipe unit 40”) including the gate valve mounting portion and the branch pipe connecting portion according to the third embodiment is the first on the upstream side and the downstream side of the fluid path. The branch paths 5 and 5 are configured to provide a second branch path 6 between the two first branch paths 5 and 5. The configurations of the first branch path 5 and the second branch path 6 are the same as those of the first embodiment shown in FIG.

  According to this configuration, the pipe unit 40 can be used as both the upstream and downstream pipe units when the flow path is changed in an uninterrupted state. That is, in the pipe unit 40 arranged on the upstream side of the fluid path, the gate valve is mounted using the first branch path 5 on the downstream side of the pipe unit 40, and the downstream side of the fluid path. In the pipe unit 40 to be arranged, a gate valve may be attached by utilizing the first branch path 5 on the upstream side of the pipe unit 40. For this reason, since only the tube unit 40 having the same specification is manufactured and prepared, the types of tube units can be reduced.

  In FIG. 4, a pipe unit 40 having a gate valve mounting portion and a branch pipe connection portion is provided with a gate valve, which will be described later, on the downstream side of the closing valve 12 that closes the second branch path 6. A sluice valve mounting pipe unit 50 for mounting is connected.

  According to this configuration, it is possible to easily remove the stop valve 12 that closes the second branch path 6 in the branch pipe connection work. Not only the pipe unit 40 of the third embodiment shown in FIG. 4 but also the pipe units of the first and second embodiments, the gate valve mounting pipe unit 50 is connected to the second branch path 6. It goes without saying that it can be done.

  Next, a case where the pipe units 3 and 20 provided with the gate valve mounting part and the branch pipe connection part according to the first embodiment are used as an example is installed a branch pipe when the flow path is changed in a continuous flow state. This method will be described with reference to FIGS. In the following description, the left side of FIG. 5 is the upstream side of the fluid path, and the right side of the page is the downstream side.

  As shown in FIG. 5, the new seismic resistant pipe according to the present invention and the seismic retrofitted replacement pipe of the existing pipe are preliminarily provided on the upstream side of the fluid path at the second branch for connecting the branch pipe to the upstream side. A pipe unit 20 provided with a first branch path 5 for attaching a gate valve on the downstream side is disposed, and on the downstream side of the fluid path, a first branch path 5 for mounting a gate valve on the upstream side, A pipe unit 3 having a second branch path 6 for connecting a branch pipe is disposed on the downstream side.

  In FIG. 5, when the flow path is changed in the state of uninterrupted flow, in order to install the branch pipe, each of the first branch paths 5 of the upstream pipe unit 20 and the downstream pipe unit 3 of the fluid path. 5 is equipped with a gate valve 60 and a branch pipe 80 is connected to each of the second branch paths 6 and 6.

  In order to attach the gate valve 60 to the first branch path 5, the closing flange 14 fixed to the flange 9 is removed, and the flange 61 of the gate valve 60 is fixed to the flange 9 with bolts 62 as shown in FIG. Then, the gate valve 60 is attached.

  Further, in order to connect the branch pipe 80 to the second branch path 6, first, the closing flange 15 fixed to the flange 11 is removed, and as shown in FIG. The flange 51 is fixed, and the gate unit 50 for attaching the gate valve is connected. In addition, this operation | work becomes unnecessary when the pipe unit 50 for gate valve mounting is connected previously.

  Next, the gate valve 70 is mounted on the flange 53 of the pipe unit 50 for mounting the gate valve. Thereafter, the closing valve 12 is removed as will be described later, and the branch pipe 80 is connected to the flange 52 of the pipe unit 50 for installing the gate valve. In this way, the second branch path 6 can be fitted with the gate valve 60 on the downstream side of the shut-off valve 12 that closes the second branch path 6. The operation of removing the closing valve 12 for closing the second branch path 6 can be easily performed.

  When the installation of the branch pipe 80 is completed, the gate valves 60 and 60 attached to the first branch paths 5 and 5 of the pipe unit 20 and the pipe unit 3 are closed and connected to the second branch paths 6 and 6. If the gate valves 70 of the gate valve mounting pipe units 50 are opened, the flow path can be changed in an uninterrupted state. Thus, according to the present invention, as in the prior art, the pipe joint body divided vertically is attached to the location where the flow path is changed each time, and the flow path pipe is cut so as to be longitudinally cut. It is not necessary to insert a gate valve into the flow passage and to make a branch hole in the flow passage pipe through the branch pipe receiving portion, so that it is possible to reduce the amount of work when changing the flow passage in an uninterrupted state. it can.

  Next, a method for removing the closing valve 12 that closes the second branch path 6 will be described with reference to FIGS.

  FIG. 8 shows a state in which the closing valve attaching / detaching device 90 is connected to the gate valve mounting pipe unit 50 in a sealed manner. Specifically, the flange 91 of the closing valve attaching / detaching device 90 is fixed to the flange 52 of the gate valve mounting pipe unit 50 in a sealing manner with a bolt or the like, and the closing valve attaching / detaching device 90 is connected to the gate valve mounting pipe unit 50. The

  FIG. 9 shows a state in which a moving means 93 for moving the spindle 92 back and forth in the closing valve attaching / detaching device 90 is mounted. The moving means 93 supplies or discharges fluid from the outside into the cylinder 94. The spindle 92 is moved back and forth. In FIG. 9, fluid is supplied from the outside into the cylinder 94, the spindle 92 is advanced, and the tip of the spindle 92 is coupled to the stop valve 12 by screwing.

  FIG. 10 shows a state in which the stop valve 12 is removed from the second branch port 6 by the spindle 92. When the fluid is discharged from the cylinder 94 to the outside in the state of FIG. 9, the spindle 92 and the stop valve 12 are removed from the second branch port 6 as shown in the state of FIG. 50 is retracted, and retracts closer to the flange 52 to which the branch pipe 80 is connected than the position of the valve body 71 of the gate valve 70. In this state, when the valve body 71 of the gate valve 70 is closed, the second branch port 6 is closed. Therefore, if the stop valve attaching / detaching device 90 is removed from the gate valve mounting pipe unit 50, the stop valve 12 is also removed. .

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, in the said Example, although the method to install a branch pipe was demonstrated about the case where the pipe units 3 and 20 provided with the gate valve attachment part and branch pipe connection part which concern on Example 1 were used, it is limited to this. Without limitation, two pipe units 30 including the gate valve mounting portion and the branch pipe connection portion according to the second embodiment may be used, and similarly, the gate valve mounting portion and the branch pipe connection portion according to the third embodiment. You may use two pipe units 40 provided with. Furthermore, the pipe units of Examples 1 to 3 may be used in appropriate combination.

  Further, for example, in the embodiment, the branch pipes are connected to the respective second branch paths of the respective pipe units. However, the present invention is not limited to this, and the second branch path is connected to a separate branch path or fluid path. A branch pipe may be connected.

  For example, in the said Example, while the 1st branch path of the pipe unit arrange | positioned in the substantially horizontal direction is formed in an upper direction, the 2nd branch path is formed in the direction orthogonal to a horizontal direction. However, the direction in which the first or second branch path is formed is not limited to the above-described embodiment, and may be appropriately set such as up and down or oblique directions.

  Further, for example, in the embodiment, the connection parts connected to the fluid pipes in the pipe unit are the connection part 8a having the receiving port shape and the connection part 8b having the insertion shape, but the connection part is, for example, a flange part. It doesn't matter.

  Further, for example, in the above-described embodiment, the pipe unit is used for a newly installed earthquake-resistant pipeline and an existing earthquake-resistant laying replacement pipeline, but the tube unit according to the present invention is a pipeline other than the above-described earthquake-resistant pipeline. It is also possible to apply to.

1 Inlet tube (fluid tube)
2 receiving pipe (fluid pipe)
3 Pipe unit 4 Fluid path 5 First branch path 6 Second branch path 7 Tubular bodies 8a and 8b Connection portion 9 Flange 10 Simplified on-off valve 11 Flange 12 Shut-off valve 13 Hook 20 Pipe unit 30, 40, 50 Pipe unit 51, 52, 53 Flange 60 Gate valve 70 Gate valve 71 Valve body 80 Branch pipe 90 Stop valve attaching / detaching device

Claims (8)

A pipe unit connected to a fluid pipe and having a fluid path communicating with the fluid pipe and a connection part connected to the fluid pipe, and suitable for construction in an unsteady flow state;
The fluid path is provided with at least two branch paths, and among the two branch paths, a first branch path includes a flange for mounting a gate valve and a simple opening and closing of the first branch path. A shut-off valve is provided, and the second branch passage is provided with a flange for connecting the branch pipe and a shut-off valve for closing the second branch passage, A pipe unit with a pipe connection.   The gate valve mounting portion and the branch pipe connecting portion according to claim 1, wherein the first branch passage is provided on the upstream side of the fluid passage and the second branch passage is provided on the downstream side. Tube unit equipped.   The gate valve mounting portion and the branch pipe connection portion according to claim 1, wherein the second branch passage is provided on the upstream side of the fluid passage and the first branch passage is provided on the downstream side. Tube unit equipped.   The first branch path is provided between the two second branch paths, and the second branch path is provided on the upstream side and the downstream side of the fluid path. A pipe unit having a sluice valve mounting part and a branch pipe connection part.   The first branch path is provided on the upstream side and the downstream side of the fluid path, and the second branch path is provided between the two first branch paths. A pipe unit having a sluice valve mounting part and a branch pipe connection part.   6. The gate valve according to claim 1, wherein a gate valve can be attached to the second branch path on the downstream side of a shut-off valve that closes the second branch path. A pipe unit having a mounting part and a branch pipe connection part. A branch pipe installation method using a pipe unit connected to a fluid pipe and having a fluid path communicating with the fluid pipe and a connection unit connected to the fluid pipe and suitable for construction in an uninterrupted flow state,
The fluid path is provided with at least two branch paths, and among the two branch paths, a first branch path includes a flange for mounting a gate valve and a simple opening and closing of the first branch path. An on-off valve is provided, and the second branch path is provided with a flange for connecting the branch pipe and a gate valve mounting part and a branch pipe connecting part provided with a closing valve for closing the second branch path. The pipe unit is previously installed at a desired location of the fluid pipe, and when the branch pipe is provided, a gate valve is attached to the first branch path, and the branch pipe is connected to the second branch path. A method of installing a branch pipe using a pipe unit, characterized in that   A tube unit provided with the second branch path on the upstream side and the first branch path on the downstream side, and provided with the first branch path on the upstream side and the second branch path on the downstream side. 8. A branch pipe installation method using a pipe unit according to claim 7, wherein the pipe unit is combined and a branch pipe is connected across the two second branch paths.

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