JP6608025B2 - Valve device mounting method and valve device removal method - Google Patents

Description

  The present invention provides a tubular body including a conduit portion through which a fluid flows, a hole portion formed in the conduit portion, and a neck portion that communicates with the hole portion and has an open end in an uninterrupted state. The present invention relates to a valve device mounting structure for mounting a valve device, a valve device mounting method, and a valve device removing method.

  2. Description of the Related Art Conventionally, there is a branch pipe joint for changing a flow path that is used when a flow path is changed in a continuous flow state without stopping a fluid in a fluid pipe buried in the ground. In such a branch pipe joint, a stop fluid pipe having a valve housing for fitting a stop fluid valve (divided valve) divided in two into a location where the flow path of the fluid main pipe is to be changed; A branch joint pipe having a branch pipe joint that is divided in two is installed (for example, see Patent Document 1). In recent years, a pipe unit in which a stop fluid pipe and a branch joint pipe are integrally formed when the fluid main pipe is installed has also been manufactured.

  In addition, a branch pipe part protruding so as to branch upward from the main pipe part is provided, an on-off valve for opening and closing the branch pipe part, and a gate valve accommodated in a valve lid joined to the upper end of the branch pipe part There is a gate valve device including a body (gate valve). In such an apparatus, the gate valve body is removed after completion of the work and stored in a predetermined storage location to prevent deterioration of the gate valve body over time (for example, see Patent Document 2).

Japanese Utility Model Publication No. 60-3430 (first page, FIG. 1) JP 2001-27349 A (page 2, FIG. 2)

  However, in the branch pipe joint for changing a flow path described in Patent Document 1, a stop valve (a gate valve) of the stop fluid pipe or a branch control valve (a partition) connected to the branch joint pipe even after the work is completed. Valve) is left as it is, and if it is left for a long period of time, there is a problem that the stop fluid valve and the branching control valve will be corroded and will not operate when used again.

  Further, even in the gate valve device described in Patent Document 2, the gate valve body (gate valve) can be removed after the operation is completed, but the on-off valve for opening and closing the branch pipe portion is left as it is. Therefore, there is a problem that if the valve is left for a long period of time, the on-off valve is corroded and does not operate when used again.

  The present invention has been made paying attention to such problems, and when performing uninterrupted flow construction, it is possible to attach a gate valve and a valve device in an uninterrupted state, and when indwelling for a long period of time. It is an object of the present invention to provide a valve device mounting structure, a valve device mounting method, and a valve device removing method in which a gate valve and a valve device can be removed.

In order to solve the above-mentioned problem, the valve device mounting structure of the present invention includes:
A valve device is attached in an uninterrupted flow state to a pipe body including a pipe line part through which fluid flows, a hole part formed in the pipe line part, and a neck part communicating with the hole part and having an open end part The neck portion has an opening to which a valve device having a valve body capable of opening and closing the neck portion can be attached, and includes a plug body that seals the opening portion and the open end portion,
The plug body has a plurality of sealing members spaced apart in the tube axis direction of the neck portion across the opening.
According to this feature, when performing the uninterrupted flow construction, the plug body seals simultaneously the opening formed in the neck portion of the pipe body and the open end portion of the neck portion, so that the valve device can be attached to the opening portion. It is possible to close the neck by the valve device, and after closing the neck, by attaching a gate valve or the like to the open end from which the plug is removed, the gate valve can be attached in an uninterrupted state. Moreover, when indwelling for a long time, both a gate valve and a valve apparatus can be removed by the valve apparatus attachment structure.

The valve device mounting structure of the present invention is
Among the plurality of sealing members, the sealing member closer to the open end than the opening is set so that the dimension from the sealing member to the open end is larger than the separation dimension of the plurality of sealing members. It is characterized by that.
According to this feature, the plug can reliably maintain a sealed state regardless of the insertion position.

The valve device mounting structure of the present invention is
The plug body includes a sealing member that seals an inner peripheral surface of the neck portion closer to the conduit portion than the opening portion.
According to this feature, the plug body seals the inner peripheral surface of the neck portion closer to the fluid pipe than the opening portion. Therefore, the opening portion and the open end portion can be sealed, and the valve device can be attached to the opening portion of the neck portion. .

The valve device mounting structure of the present invention is
The plug includes a sealing member that seals the inner peripheral surface of the neck closer to the open end than the opening, and the sealing member slides on the inner peripheral surface of the neck in the tube axis direction of the neck. It is characterized by being possible.
According to this feature, the sealing member seals the inner peripheral surface of the neck portion closer to the open end than the opening portion, so that the plug body can move relative to the neck portion after the valve device is attached to the opening portion of the neck portion.

The valve device mounting structure of the present invention is
The neck portion includes a seat with which the valve body abuts on an inner peripheral surface of the neck portion.
According to this feature, since the seat with which the valve body of the valve device abuts on the inner peripheral surface of the neck portion is provided, the valve device can reliably close the neck portion.

The valve device mounting structure of the present invention is
The neck portion includes a cover that detachably covers the opening from the outer peripheral side of the neck portion.
According to this feature, the removable cover covers from the radially outer side of the neck, so that the opening can be sealed from the outer side of the neck and corrosion of the portion of the neck where the valve device is attached can be prevented.

The valve device mounting method of the present invention comprises:
A valve device is attached in an uninterrupted flow state to a pipe body including a pipe line part through which fluid flows, a hole part formed in the pipe line part, and a neck part communicating with the hole part and having an open end part A method of attaching a valve device having a valve body capable of opening and closing the neck to an opening provided in the neck, and a plurality of the devices spaced apart in the tube axis direction of the neck across the opening A step of moving a plug having a sealing member and sealing the opening and the open end, and communicating the opening and the hole; and a step of moving the valve and closing the neck And a step of removing the plug from the open end.
According to this feature, a valve device having a valve body capable of opening and closing the neck is attached to an opening provided in the neck, and the opening and the hole are moved by moving the plug that seals the opening and the open end. After the parts are communicated, the valve body is moved and closed, and the plug body is removed from the open end, so that a gate valve or the like can be attached to the open end, and uninterrupted construction can be performed.

The valve device removal method of the present invention comprises:
A valve device is removed in an uninterrupted flow state in a tubular body having a conduit portion through which a fluid flows, a hole portion formed in the conduit portion, and a neck portion communicating with the hole portion and having an open end portion. In the method, the valve body of the valve device attached to the opening portion of the neck portion is closed, and a plurality of the opening portions are spaced apart from each other in the tube axis direction of the neck portion with the opening portion interposed therebetween. Attaching the plug body having the sealing member in a sealed state, opening the valve body, and moving the plug body to seal the inner peripheral surface of the neck portion closer to the conduit portion than the opening portion. And a step of removing the valve device attached to the opening.
According to this feature, since the plug body is attached to the open end in a sealed state with the neck portion closed by the valve body of the valve device, the valve body can be opened, and the plug body can be opened by opening the valve body. Since the body can be moved to seal the inner peripheral surface of the neck portion closer to the conduit portion than the opening portion, the valve device attached to the opening portion can be removed. As a result, it can be left for a long time with both the gate valve and the valve device removed.

(A) is a top view of the partial cross section which shows the pipe body of the installation state in Example 1, (b) is a side view of a partial cross section similarly. (A) is AA sectional drawing of FIG.1 (b), (b) is BB sectional drawing of Fig.1 (a). (A) is a sectional side view showing the removal of the set screw in the backup ring disassembling procedure, (b) is a sectional side view showing the disassembling of the back member, and (c) is the disassembling of the back member and the seal member. The side sectional view to show, (d) is a side sectional view which shows decomposition | disassembly of a sealing member. (A) is a top view of the partial cross section which shows attachment of the valve apparatus to a neck part, (b) is a side view of a partial cross section similarly. (A) is a plan view of a partial cross section showing a procedure for exchanging bolts and nuts for tightening a plug with a slider jig, and (b) is a side view of the partial cross section. (A) is a plan view of a partial cross section showing a procedure for disassembling the plug body, and (b) is a side view of the same partial cross section. (A) is a plan view of a partial cross section showing a procedure for attaching a gate valve, and (b) is a side view of the same partial cross section. (A) is a partial cross-sectional front view showing a state before the gate valve body is inserted into the neck, (b) is a partial cross-sectional front view showing a state after the gate valve main body is inserted into the neck, (C) is the front view of the partial cross section which shows the state which attached the gate valve main body to the neck part. These are the top views of a partial cross section which show the state which attached the gate valve and the bypass pipe to the pipe body. (A) is a side sectional view showing assembly of the seal member in the backup ring assembly procedure, (b) is a side sectional view showing assembly of the back member and the seal member, and (c) is an assembly of the back member. The side sectional view to show, (d) is a side sectional view which shows attachment of a press screw. (A) is a top view of the partial cross section which shows the tubular body in Example 2, (b) is a side view of a partial cross section similarly. (A) is the top view of the partial cross section which shows decomposition | disassembly of the plug body in Example 2, and closing of a neck part, (b) is a side view of a partial cross section similarly. These are the top views of the partial cross section which show the state which attached the bypass pipe to the pipe body in Example 2. FIG. (A) is a plan view of a partial cross section showing a state in which a backup ring of another embodiment is attached to a tube, (b) is a plan view of the backup ring, and (c) is a tube of the backup ring. It is a side view of the partial cross section which shows the state attached to. (A) is the top view which shows the state which attached the backup ring of another Example to the pipe body, (b) is the top view of a backup ring similarly, (c) is the same, the backup ring was attached to the pipe body It is a side view of the partial cross section which shows a state. It is a top view of the partial cross section which shows the state which attached the plug body in Example 3 to the pipe body. It is a top view of the partial cross section which shows the attachment / detachment procedure of a working valve when using the plug body of FIG. Furthermore, it is the top view of the partial cross section which shows the state which attached the plug body of the other Example to the pipe body.

  EMBODIMENT OF THE INVENTION The form for implementing the valve apparatus attachment structure which concerns on this invention, the valve apparatus attachment method, and the valve apparatus removal method is demonstrated below based on an Example.

  The valve device mounting structure, the valve device mounting method, and the valve device removing method according to the first embodiment will be described with reference to FIGS. The pipe body 1 of the present embodiment is made of, for example, ductile cast iron for waterworks buried in the ground, and the pipe portion has an inner peripheral surface covered with a mortar layer. The tube 1 according to the present invention may be made of other metals such as cast iron and steel, or asbestos, concrete, vinyl chloride, polyethylene, or polyolefin. Furthermore, the inner peripheral surface of the tubular body 1 is not limited to the mortar layer, and may be coated with, for example, an epoxy resin or the like, or an appropriate material may be coated on the inner peripheral surface of the tubular body 1 by powder coating. . Further, in the present embodiment, the fluid in the tube 1 is not limited to the clean water of the present embodiment, but is, for example, industrial water, agricultural water, sewage, etc., or a gas-liquid mixture of gas and gas and liquid. It doesn't matter. 1, 4 to 7, and 9, the right side of the drawing is described as the upstream side of the tube body 1.

  As shown in FIG. 1, in the tube body 1 of this embodiment, both the upstream end portion and the downstream end portion are the insertion portions 2 and 3. And each insertion part 2 and 3 is connected to the receiving parts 6 and 7 of the fluid pipes 4 and 5 which comprise the fluid pipe line embed | buried under the substantially horizontal direction in the ground. Further, the pipe body 1 in the present embodiment has a pipe line part 8 through which a fluid flows, protrudes in a direction different from the pipe axis of the pipe line part 8, and is branched slightly in a horizontal direction. A neck portion 11 that protrudes in a direction different from the tube axis of the conduit portion 8 and branches in the vertical direction is provided at the downstream portion. In the state where the tube body 1 is laid, the open end 13 of the neck 11 is closed by the plug 21 and the open end 43 of the neck 41 is closed by the plug 51.

  As will be described later, the tubular body 1 according to the present embodiment attaches a gate valve 84 and a bypass pipe 85 to the neck portion 41 so as to secure a fluid bypass path (see FIG. 9). The pipe 1 is suitable for construction in a continuous flow state, and the construction can be performed by the fluid pipes 4 and 5 on the downstream side of the pipe 1. Further, a neck valve body 90 (to be described later) for partitioning the duct portion 8 is attached to and detached from the neck portion 11.

  Next, the neck portion and the plug body constituting the valve device mounting structure of the present invention will be described. Although the neck parts 11 and 41 and the plug bodies 21 and 51 of FIG. 1 differ in the cross-sectional shape, since the structure is the same, the structure of the neck part 11 and the plug body 21 is mainly demonstrated. As shown in FIG. 1, a tubular neck portion 11 is formed in the conduit portion 8 so as to surround a hole portion 12 formed in the conduit portion 8, and the neck portion 11 is an open end communicating with the hole portion 12. Part 13, a flange 17 connected to the open end 13, and an opening 14 to which a valve device described later can be attached. The cross-sectional shape of the neck portion 11 in FIG. 1 is substantially elliptical, but may be substantially circular like the neck portion 41 in FIG. 1, or may be substantially oval, substantially rectangular, or the like.

  A plug 21 is detachably fixed to the flange 17 by bolts and nuts 19. In addition, a seal (not shown) may be inserted between the flange 17 and the plug body 21 to improve the sealing performance. The plug body 21 has a cylindrical portion 21a inserted along the inner periphery of the neck portion 11, and is fitted into an annular groove on the outer periphery of the cylindrical portion 21a so as to be spaced apart by a predetermined distance in the axial direction of the cylindrical portion 21a. The sealing members 22 and 23 are held. In a state where the plug body 21 is fixed to the flange 17, the sealing member 22 is in contact with the lower inner peripheral surface 15 on the pipe section 8 side from the opening portion 14, and the gap between the neck portion 11 and the plug body 21 is sealed. The fluid in the pipe line part 8 is prevented from leaking from the open end part 13 and the opening part 14. Similarly, in a state where the plug body 21 is fixed to the flange 17, the sealing member 23 is in contact with the upper inner peripheral surface 16 on the open end 13 side from the opening 14, and the gap between the neck 11 and the plug body 21 is sealed. Thus, the fluid in the pipe line portion 8 is prevented from leaking from the open end portion 13.

  Thus, the plug 21 has a function of sealing the opening 14 and the open end 13 at the same time. As the sealing member, a round rubber packing having a circular cross section, a substantially C-shaped or rectangular shape, or a rubber packing with a lip can be used. A lining-type sealing member may be used instead of a fitting-type sealing member.

  Further, the sealing members 22 and 23 can slide on the lower inner peripheral surface 15 and the upper inner peripheral surface 16 of the neck portion 11 in the tube axis direction of the neck portion 11. In FIG. 1 (b), when the bolt / nut 19 is loosened, the plug body 21 moves so as to be separated from the flange 17 by the pressure of the fluid in the pipe line portion 8. When the stopper 21 moves and the sealing member 22 reaches the position of the opening 14, the side facing the opening 14 does not come into close contact with the inner peripheral surface of the neck 11, so that the sealing member 22 is temporarily Loses its sealing function. However, when the sealing member 22 is positioned in the opening portion 14, the sealing member 23 is in contact with the upper inner peripheral surface 16 of the neck portion 11 and seals the gap between the neck portion 11 and the plug body 21. Leakage of the fluid in the conduit 8 from 13 is still prevented. When the bolts and nuts 19 are further loosened, the plug body 21 further moves away from the flange 17, and the sealing member 22 contacts the upper inner peripheral surface 16 of the neck section 11, and the neck section 11 and the plug body 21. And the fluid in the pipe line portion 8 from the open end portion 13 is always prevented from leaking. The plug body 21 may be moved not only by the pressure of the fluid in the pipe section but also by using a jig such as a wedge or a bar.

  Thus, since the plug body 21 is provided with the sealing members 22 and 23 that can slide the inner peripheral surface of the neck portion 11 in the tube axis direction of the neck portion 11 on the outer peripheral surface of the cylindrical portion 21a, the sealed state is maintained. The plug body 21 can be moved with respect to the neck portion. Further, in a state where the plug body 21 is fixed to the flange 17, the dimension from the upper end of the sealing member 23 to the open end 13 is larger than the dimension between the sealing members 22 and 23 provided on the plug body 21. It is set large. Therefore, when the plug body 21 moves away from the flange 17, the sealing member 22 and the sealing member 23 can always be in contact with the upper inner peripheral surface 16 at the same time, so that the opening portion 14 exists in the neck portion 11. Even if it does, the plug 21 can maintain a sealed state reliably irrespective of the insertion position.

  In addition, a seat 24 is provided on the inner peripheral surface of the neck portion 11 connected to the opening portion 14 of the neck portion 11 so as to contact a valve body of a valve device attached to the opening portion 14. As will be described later, when the valve bodies 73 and 83 of the work valves 66 and 76 attached to the opening 14 are moved to close the neck portion 11, the valve body is attached to a seat 24 formed on the inner peripheral surface of the neck portion. The neck can be reliably closed by abutting. The neck portion 41 and the plug body 51 also have the same functions and performance as the neck portion 11 and the plug body 21.

  Next, the configuration of the backup rings 26 and 56 as the cover of the present invention will be described. The backup rings 26 and 56 in FIG. 1 are also different in cross-sectional shape, but have the same configuration, so the configuration of the backup ring 26 will be mainly described. As shown in FIG. 2A, the cross-sectional shape of the backup ring 26 has a substantially oval shape so as to match the cross-sectional shape of the neck. The back-up ring 26 is provided with a back member 27, 28, a seal member 30, a push screw 31 screwed into a screw hole provided in the back member 28, and an antioxidant for covering the outer periphery of the push screw 31 and the back members 27, 28 It is comprised from the rubber band 32 of this.

  The back members 27 and 28 have a two-part structure, and are integrally configured by engaging the mating members 34 formed at the ends of the back members 27 and 28 with each other. Since the backup ring 26 has a divided structure, the backup ring 26 can be assembled so as to cover the opening 14 from the outer peripheral side of the neck 11. In this embodiment, the back members 27 and 28 are made of a metal material such as iron or stainless steel or a reinforced plastic such as FRP. However, the constituent material of the back member is not necessarily limited to this, and the number of divisions is also limited. It is not limited to two divisions, and can be divided into three or more divisions.

  A seal member 30 is provided on the side where the back member 28 faces the opening 14 of the neck 11, and seals the gap between the neck 11 and the back member 28. Further, the one back member 27 is provided with a concave portion 33 and is fitted to the convex portion 18 provided on the neck portion 11 so as to be held by the neck portion 11.

  On the other hand, the seal member 30 is provided detachably with respect to the back member 28, and the seal member 30 can move with respect to the back member 28 by rotating a push screw 31 screwed into the back member 28. It is like that. By attaching the backup ring 26 so as to cover the opening 14 and rotating the push screw 31, the seal member 30 is pressed against the neck 11 by the push screw 31, and the gap between the backup ring 26 and the opening 14 is sealed. Is done.

  Thus, the seal member 30 provided on the backup ring 26 covers the neck 11 and the opening 14 from the outer peripheral side of the neck 11, so that the gap between the opening 14 and the backup ring 26 is sealed only by the backup ring 26. Since it can do, it is prevented that the fluid of the pipe line part 8 leaks from the opening part 14. FIG. Note that the backup ring 56 covering the neck 41 also has the same function and performance as the backup ring 26.

  Next, the work procedure of the construction in the uninterrupted flow state using the valve device mounting structure of the present invention will be described.

  In the laying state where the tube body 1 is installed for a long period of time, the plug body 21 and the backup ring 26 are attached to the neck portion 11 and the plug body 51 and the backup ring 56 are attached to the neck portion 41 as shown in FIG. It is in the state that was.

  As shown in FIG. 3, the backup ring 26 is removed as an initial procedure when the construction is performed in the uninterrupted flow state. First, a rubber band (not shown) covering the periphery of the back members 27 and 28 and the push screw 31 are removed from the back member 28 (see FIG. 3A), and the back member 28 is shifted in the tube axis direction of the neck portion 11. Then, the engagement of the mating member 34 is released (see FIG. 3B), and then the back member 27 fitted to the convex portion 18 of the neck portion 11 is removed from the neck portion 11 (see FIG. 3C). Finally, the seal member 30 attached to the opening 14 is removed (see FIG. 3D), and the removal of the backup ring 26 is completed. Further, the backup ring 56 of the neck 41 is also disassembled in the same procedure as in FIG.

  Next, as shown in FIG. 4A, a working valve 66 as a valve device of the present invention is attached to the opening 14 of the neck 11. The concave portion 69 provided in the holder 68 of the work valve 66 is fitted to the convex portion 18 of the neck portion 11. Due to this uneven engagement, the vertical movement of the work valve 66 is restricted, and the mounting angle of the work valve 66 with respect to the neck portion 11 is kept constant. Next, the work valve main body 67 is attached to the opening 14 of the neck 11, and finally, the bolt 71 and the nut 72 are tightened with a specified torque, and the work valve main body 67 and the holder 68 are attached to the neck 11. Further, as shown in FIG. 4B, the work valve 76 is attached to the opening 44 of the neck 41 in the same procedure. The concave / convex engagement between the concave portion 79 provided on the holder 78 of the work valve 76 and the convex portion 48 of the neck portion 41 has a circular cross-section in addition to the above-described vertical movement restriction and mounting angle holding function. It also functions to prevent rotation of the work valve attached to the neck portion 41.

  Next, as shown in FIG. 5B, a predetermined number of bolts and nuts 19 for tightening the flange 17 and the plug body 21 of the neck portion 11 are replaced with a slider jig 87, and the flange 17 and the plug body of the neck portion 11 are replaced. 21 is tightened with a slider jig 87. Similarly, as shown in FIG. 5A, a predetermined number of bolts and nuts 49 for tightening the flange 47 of the neck portion 41 and the plug body 51 are replaced with a predetermined number of slider jigs 87 and tightened.

  Next, as shown in FIG. 6B, the slider jig 87 for tightening the flange 17 of the neck portion 11 and the plug body 21 is loosened, and the valve body 73 of the work valve 66 can be inserted into the opening portion 14 of the neck portion 11. The plug body 21 is moved to the position, and then the operating shaft 70 of the work valve 66 is rotated to bring the valve body 73 into contact with the seat 24 to close the neck portion 11. Finally, the plug 21 is removed with the neck 11 closed. Normally, the slider jig 87 is marked to manage the movement position of the plug body 21. However, the stroke body jig 88 having a substantially U-shaped cross section shown in FIG. It is also possible to manage the movement position. Similarly, as shown in FIG. 6A, the neck 41 is closed by the work valve 76, and the plug 51 is removed.

  Next, as shown in FIGS. 7 and 9, a gate valve 84 is attached to the flange 47 of the neck portion 41, and a bypass pipe 85 is further attached.

  On the other hand, as shown in FIG.7 and FIG.8, about the neck part 11, the gate valve body 90 for partitioning the pipe line part 8 is attached using the valve insertion apparatus 100. FIG. 8A and 8B show a CC cross section of FIG. 7A. Hereinafter, the attachment procedure of the gate valve main body 90 will be described.

  As shown in FIGS. 7 and 8A, the moving frame 102 is fixed to the flange 91 of the gate valve body 90 using the holding member 103 and the bolt 104. Next, the sealing member 94 provided in the housing 92 of the gate valve main body 90 is inserted into the upper inner peripheral surface 16 of the neck portion 11 to seal the gap between the housing 92 and the neck portion 11. Further, the fixing frame 101 is fixed to the flange 17 of the neck 11 by the engaging member 105. Since the moving frame 102 is supported by the fixed frame 101 via the jack bolt 107, the gate valve body 90 is held so as not to move even when the fluid pressure of the pipe line portion 8 acts on the gate valve body 90. Is done.

  Next, the valve body 73 of the work valve 66 attached to the neck portion 11 is opened and stored in the housing 74, the jack bolt 107 is rotated, and the gate valve body 90 is inserted into the neck portion 11 (FIG. 8B). reference). Finally, the flange 17 of the neck portion 11 and the flange 91 of the gate valve main body 90 are fastened and fixed by bolts and nuts 19 and the valve insertion device 100 is removed (see FIG. 8C).

  In this way, as shown in FIG. 9, the attachment of the gate valve body 90 to the neck portion 11, the attachment of the gate valve 84 to the neck portion 41 and the attachment of the bypass pipe 85 are completed. When replacing the fluid pipes 4 and 5, the working valve 76 attached to the neck portion 41 and the gate valve 84 attached to the neck portion 41 are opened on both the upstream side and the downstream side to allow fluid to flow through the bypass pipe 85, and The upstream and downstream gate valve bodies 90 provided in the passage 8 are closed. Then, the construction can be performed in a state where the fluid pipes 4 and 5 sandwiched between the two gate valve main bodies 90 are in an uninterrupted state.

  Further, when the construction in the uninterrupted flow state is finished and the pipe body 1 is returned to the laid state in which the pipe body 1 is installed for a long time, the gate valve body 90 of the pipe section 8 is first lifted and accommodated in the housing 92. The pipe section 8 is opened, and the fluid flows into the fluid pipes 4 and 5 on the downstream side. Next, the work valve 76 attached to the gate valve 84 and the neck 41 is closed, and the bypass pipe 85 and the gate valve 84 for detouring are removed. Then, the open end 43 of the neck portion 41 is closed by the plug body 51, and the flange 47 and the plug body 51 are fixed by the slider jig 87 (see FIG. 6).

  The gate valve body 90 attaches the valve insertion device 100 and fixes the gate valve body 90, and then removes the bolts and nuts 19 that fasten the gate valve body 90 and the flange 17 of the neck portion 11 (see FIG. 8B). Next, after the gate valve body 90 is pulled up to a position where the sealing member 94 of the gate valve body 90 is in contact with the upper inner peripheral surface 16 of the neck portion 11 and the valve body 73 of the work valve 66 can be closed, The valve body 73 of the valve 66 is inserted into the neck portion 11 and the neck portion 11 is closed (see FIGS. 7B and 8A). Finally, the gate valve body 90 and the valve insertion device 100 are removed, and the flange 17 and the plug body 21 are fixed by the slider jig 87 (see FIG. 6).

  Next, the work valve 66 of the neck part 11 and the work valve 76 of the neck part 41 are opened, the slider jig 87 is tightened, the plug body 21 is brought into close contact with the flange 17 and the plug body 51 to the flange 47, the bolt / nut 19 and Tighten with 49. Since the opening 14 and the open end 13 are sealed by the plug body 21, and the opening 44 and the open end 43 are sealed by the plug body 51, the work valves 66 and 76 can be removed.

  Finally, as shown in FIG. 10, the seal member 30 is inserted into the opening 14 of the neck 11 (see FIG. 10A), and the concave portion 33 of the back member 27 is fitted to the convex portion 18 of the neck 11 ( Next, the back member 28 and the mating member 34 of the back member 27 are engaged (see FIG. 10C), and a push screw 31 is screwed into the back member 28 (FIG. 10D). Finally, the rubber members 32 (not shown) cover the back members 27 and 28 and the push screw 31 to prevent corrosion. Further, the backup ring 56 is attached to the opening 44 of the neck 41 in the same procedure.

  As described above, in the valve device mounting structure, the valve device mounting method, and the valve device removal method in the present embodiment, the plug bodies 21 and 51 are connected to the neck portions 11 and 41 of the tube body 1 when performing uninterrupted construction. The openings 14 and 44 and the open ends 13 and 43 of the neck are sealed at the same time, so that the work valves 66 and 76 can be attached to the openings 14 and 44. 11 and 41 can be closed, and after closing the neck portions 11 and 41, the plug bodies 21 and 51 are removed, and the gate valve body 90 and the gate valve 84 can be attached to the neck portions 11 and 41 in an uninterrupted state. it can. Moreover, when indwelling for a long time, both the gate valve main body 90, the gate valve 84, and the work valves 66 and 76 can be removed by the valve device attachment device.

  Moreover, since the plug bodies 21 and 51 in the present embodiment include the sealing members 22 and 53 that seal the inner peripheral surfaces of the neck portions 11 and 41 closer to the conduit portion 8 than the openings 14 and 44, 44 and the open ends 13 and 43 can be sealed, and work valves 66 and 76 can be attached to the openings 14 and 44 of the necks 11 and 41.

  Furthermore, since the plug bodies 21 and 51 in the present embodiment include the sealing members 23 and 52 that seal the inner peripheral surfaces of the neck portions on the open end sides 13 and 43 with respect to the openings 14 and 44, the openings of the neck portions 11 and 41 are provided. After attaching the working valves 66, 76 to the parts 14, 44, the plugs 21, 51 can move relative to the neck.

  Since the neck parts 11 and 41 in this embodiment are provided with seats with which the valve bodies 73 and 83 of the work valves 66 and 76 come into contact with the inner peripheral surface connected to the openings 14 and 44, the valve device reliably closes the neck part. be able to.

  Since the neck parts 11 and 41 in this embodiment are provided with the backup rings 26 and 56 that cover the opening parts 14 and 44 from the radially outer side of the neck parts 11 and 41, the opening parts 14 and 44 are covered from the radially outer side of the neck part and opened. The portions 14 and 44 can be sealed from the outside of the neck portion, and corrosion of the mounting surfaces of the work valves 66 and 76 at the neck portions 11 and 44 can be prevented.

  Next, a valve device attachment structure, a valve device attachment method, and a valve device removal method according to Example 2 will be described with reference to FIGS. In addition, the description which overlaps with the same structure as the said Example is abbreviate | omitted. In the first embodiment, when the bypass pipe 85 is connected to the neck portion 41, the gate valve 84 is attached to the flange 47 (see FIG. 9). However, in the second embodiment, the work valve 76 is replaced with the gate valve 84. And the gate valve 84 is omitted.

  In FIG. 11, the gate valve body 90 is attached to the neck 11. Next, the bolts and nuts 49 for tightening the plug body 51 and the flange 47 of the neck portion 41 are replaced with the slider jig 87, the slider jig is loosened, and the sealing member 52 provided on the neck portion 41 contacts the upper inner peripheral surface 46. The plug body 51 is moved from the opening 44 to a position where the valve body 73 of the work valve 76 can be inserted, and then the valve body 83 of the work valve 76 is closed to close the neck 41 (FIG. 12). (A)).

  Next, as shown in FIG. 13, the plug 51 is removed, and the bypass pipe 85 is attached to the flange 47 of the neck portion 41. In this way, the work valve 76 can be used in place of the gate valve and the bypass pipe can be attached, so that the work time and cost can be reduced.

  Next, a valve device attachment structure, a valve device attachment method, and a valve device removal method according to Example 3 will be described with reference to FIGS. In addition, the description which overlaps with the same structure as the said Example is abbreviate | omitted. In the first and second embodiments, the plug has only a function of sealing the open end and the opening. However, the present invention is not limited to this, and the structure of the plug is a cylinder as in the third embodiment. It is also possible to provide a plug body having a function of blocking and opening. In addition, Example 3 differs from Examples 1 and 2 only in the configuration of the plug, and the other configuration is the same.

  As shown in FIG. 16, the on-off valve 131 as a plug body of the third embodiment is configured by integrating a cylindrical portion 131 a and a valve portion 131 b. The cylindrical portion 131a is a hollow cylindrical member that is inserted along the inner periphery of the neck portion 41. The cylindrical portion 131a is fitted into an annular groove on the outer periphery of the cylindrical portion 131a, and has a predetermined interval in the axial direction of the cylindrical portion 131a. Sealing members 132 and 133 that are held apart are attached. In this way, when the sealing members 132 and 133 are damaged, the replacement can be easily performed. The valve portion 131b includes a flange 131c formed continuously at the base end of the tube portion 131a, a flange 131d for mounting to the bypass pipe 85, a valve box having a valve body (not shown) in communication with both flanges 131c and 131d. It is equipped with. With the flange 131c of the on-off valve 131 and the flange 47 of the neck portion 41 connected by bolts and nuts 134, the opening 44 (not shown) of the neck portion 41 is fitted in an annular groove on the outer periphery of the cylindrical portion 131a. It is sealed by the sealing members 132 and 133, and the open end portion 43 of the neck portion 41 is sealed by the valve portion 131b. Furthermore, the opening / closing valve 131 can freely open and close the open end 43 of the neck 41 by a valve operation, unlike the plug of the above embodiment.

  Next, a procedure for attaching / detaching the work valve when the on-off valve 131 is used will be described.

  First, as shown in FIG. 5A, a predetermined number of bolts and nuts 49 for tightening the flange 47 and the plug body 51 of the neck portion 41 are replaced with a slider jig 87, and the flange 47 and the plug body of the neck portion 41 are replaced. 51 is tightened with a slider jig 87.

  Subsequently, as shown in FIG. 6A, the slider jig 87 for tightening the flange 47 of the neck portion 41 and the plug body 51 is loosened, and the valve body 83 of the work valve 76 can be inserted into the opening 44 of the neck portion 41. The stopper 51 is moved to the position. Next, the operating shaft 80 of the work valve 76 is rotated, and the neck portion 41 is closed by the valve body 83. In this state, the plug 51 is removed.

  Next, as shown in FIG. 17, the cylindrical part 131a of the on-off valve 131 with the valve body (not shown) closed is inserted into the open end 43 of the neck part 41 and fixed by a predetermined fixing means (not shown). Subsequently, the operating shaft 80 of the work valve 76 is operated to pull up the valve body 83 and open the neck portion 41. Thereafter, the fixing means described above is tightened, and the flange 131 c of the on-off valve 131 is brought into close contact with the flange 47 of the neck portion 41. Next, the above-mentioned fixing means is replaced with a bolt / nut 134 or tightened while being fixed by the fixing means. In this state, the opening 44 and the open end 43 of the neck 41 are sealed by the on-off valve 131, so that the work valve 76 can be removed (see FIG. 16). In this manner, the work valve 76 can be removed by the valve device attachment device using the on-off valve 131. The fixing means described above may be any means as long as it fixes the on-off valve 131 against the fluid pressure so as not to be detached from the neck portion 41. For example, the slider jig 87, the stroke management jig 88, The valve insertion device 100 may be used, or a device having a hydraulic mechanism may be used. Furthermore, it is also possible to attach the work valve 76 by a procedure reverse to the procedure described above.

  Moreover, although the on-off valve 131 of FIG. 16 has comprised the cylinder part 131a and the valve part 131b integrally, a cylinder part and a valve can also be comprised separately. As shown in FIG. 18, the on-off valve 135 is configured such that a cylindrical body 136 and a valve body 139 b are detachably attached by bolts and nuts 137. The cylindrical body 136 includes a cylindrical portion 136a, a flange 136b, and a flange 136c. The cylindrical portion 136a is fitted into an annular groove on the outer periphery on the front end side, and is held at a predetermined interval in the axial direction of the cylindrical body 136. Sealing members 132 and 133 are provided. In this way, when the sealing members 132 and 133 are damaged, the replacement can be easily performed. Similarly to the on-off valve 131 of FIG. 16, in the on-off valve 135 of FIG. 18, the opening 44 of the neck portion 41 is sealed by the sealing members 132 and 133 fitted in the annular groove on the outer periphery of the cylindrical portion 136a. The open end 43 is sealed by a valve body 139b. Therefore, the work valve 76 can be removed also by a valve device attachment device using the on-off valve 135. The work valve removal procedure when the on-off valve 135 is used can also be performed in the same procedure as the procedure when the on-off valve 131 is used. Furthermore, it is also possible to attach the work valve 76 by a procedure reverse to the procedure described above.

  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.

  In the above embodiment, the back-up ring 26 in FIG. 2 is integrated by engaging the back members 27 and 28 with the mating member 34. However, the present invention is not limited to this, for example, as in the back-up ring 110 in FIG. The back members 111 and 112 may be attached to the neck 11 by tightening with the bolts and nuts 113. Further, the backup ring 110 may be positioned with respect to the neck portion 11 by engaging the convex portions 114 provided at the end portions of the back members 111 and 112 with the grooves 115 provided in the neck portion 11.

  Further, as shown in FIG. 15, the back members 121 and 122 of the backup ring 120 can be attached to the neck portion 11 by rubber lining pins 123. Similarly to FIG. 14, the backup ring 120 can be positioned with respect to the neck portion 11 by engaging the convex portion 124 provided at the end portion of the back member 121, 122 with the groove 125 provided in the neck portion 11. . In addition, it is desirable to give a rubber lining to the outer peripheral surface and the front end surface of the cylindrical portion 21a of the plug body 21 to improve the sealing performance.

  In the embodiment, both the upstream and downstream ends of the tube 1 are the insertion portions 2 and 3, but both the upstream and downstream ends of the tube 1 are received. The structure used as the cutting | disconnection edge part (illustration omitted) formed by the opening | mouth part or cutting | disconnection may be sufficient. The upstream and downstream ends of the tube body 1 may be configured such that one is an insertion port and the other is a receiving port, or one is a cut end and the other is an insertion port. Or you may become the structure which combined the insertion part which becomes an opening part, an opening part, and a cutting | disconnection edge part. In addition, the pipe body of the present invention is not necessarily limited to a fluid pipe as long as it constitutes a conduit through which a fluid flows, and may include, for example, a valve body portion such as a gate valve and a ball valve and a sleeve.

  Moreover, in the said Example, although the neck part 41 protrudes in the substantially horizontal direction different from the pipe axis line of the pipe line part 8, and the neck part 11 protrudes in the perpendicular direction different from the pipe axis line of the pipe line part 8, this is provided. However, the neck 11 and the neck 41 may both be provided on the same surface, or one of them may be provided on the upper surface and the other may be provided on the side surface. Further, only one neck or three or more necks may be provided on one tube.

  In the above embodiment, the work valves 66 and 76 are inserted perpendicularly to the axis of the necks 11 and 41 at right angles, but the work valves 66 and 76 are inserted in the directions of the necks 11 and 41. You may make it insert from a slightly diagonal direction with respect to an axis. Furthermore, the openings 14 and 44 provided in the neck portions 11 and 41 may be provided in any direction around the neck portions 11 and 41.

DESCRIPTION OF SYMBOLS 1 Tube 2, 3 Insertion part 4, 5 Fluid pipe 6, 7 Receptacle part 8 Pipe part 11 Neck part 12 Hole part 13 Open end part 14 Opening part 15 Lower inner peripheral surface 16 Upper inner peripheral surface 17 Flange 21 Plug Body 21a Tube portion 22, 23 Sealing member 24 Seat 26, 56 Backup ring (cover)
41 Neck 42 Hole 43 Open End 44 Opening 51 Plug 52, 53 Sealing Member 54 Seat 66, 76 Work Valve (Valve Device)
84 Gate valve 90 Gate valve body 100 Valve insertion device 110, 120 Backup ring (cover)
131 On-off valve (plug body)
131a Tube part 131b Valve part 132, 133 Sealing member 135 On-off valve (plug)
136 cylinder 136a cylinder part

Claims (6)

  A valve device is attached in an uninterrupted flow state to a pipe body including a pipe line part through which fluid flows, a hole part formed in the pipe line part, and a neck part communicating with the hole part and having an open end part A method of attaching a valve device having a valve body capable of opening and closing the neck to an opening provided in the neck, and a sealing member for sealing the opening and the open end A step of communicating the opening and the hole, a step of moving the valve body to close the neck, and a step of removing the gate valve body from the open end And a valve device mounting method comprising:   The valve device mounting method according to claim 1, wherein the gate valve body has a housing provided with the sealing member.   3. The valve device mounting method according to claim 1, wherein a plurality of the sealing members are provided so as to be separated from each other in the tube axis direction of the neck portion with the opening interposed therebetween.   A valve device is removed in a non-continuous flow state from a tubular body having a conduit portion through which a fluid flows, a hole portion formed in the conduit portion, and a neck portion communicating with the hole portion and having an open end portion. A method of attaching a gate body provided with a sealing member to the open end in a sealed state in a state where a valve body of a valve device attached to an opening of the neck is closed; A step of opening the valve body, a step of moving the gate valve main body to seal the opening and the hole by the sealing member, and a step of removing the valve device attached to the opening. A method for removing the valve device.   The valve device removing method according to claim 4, wherein the gate valve main body has a housing provided with the sealing member.   The valve device removal method according to claim 4 or 5, wherein a plurality of the sealing members are provided so as to be separated from each other in the tube axis direction of the neck portion with the opening portion interposed therebetween.

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