JP7291393B2 - Fluid control installation structure and fluid control installation method - Google Patents

Description

The present disclosure relates to structures and methods for installing a fluid control within a housing that sealingly surrounds a fluid conduit.

It is known to cut a fluid pipe hermetically surrounded by a housing in an uninterrupted state, and install a fluid control such as a valve device inside the housing through an opening provided in the housing. there is In Patent Document 1, a fixing member that slides horizontally and engages with the opening is used to prevent the flow control from leaking out of the opening. However, since the fluid pressure or the like acts on the fluid control to tilt it in the direction of the tube axis, it may not be possible to smoothly slide the fixing member. In addition, the clearance for sliding the fixed member affects the compression of the bottom portion of the sealing member, which may lead to water stoppage failure. From the above, it is considered that it is not sufficient to install the fluid control in an appropriate posture.

JP 2016-61391 A

An object of the present disclosure is to provide a fluid control installation structure and a fluid control installation method that can install a fluid control in a proper posture.

The fluid control installation structure of the present disclosure includes a housing that sealingly surrounds a fluid pipe, a fluid control that is installed inside the housing, and a lid that is flange-connected to an opening provided at the top of the housing. a body, wherein the fluid control has a pair of surfaces to be pressed spaced apart from each other in the pipe axis direction, and the lid body is arranged to prevent the fluid from escaping from the opening. It has a pair of pressing surfaces for pressing the pressed surfaces of from above. According to such a configuration, the fluid control on which a force tilting in the direction of the tube axis acts can be installed in an appropriate posture.

Preferably, the pressed surface is inclined downward or upward with increasing distance from the central axis of the opening, and the pressed surface is inclined in the same direction as the pressed surface. This has the effect of centering the fluid control.

A first bolt hole group is formed in the flange of the cover so as to be unevenly distributed on the tube axis side in plan view, and a second bolt hole group corresponding to the first bolt hole group is formed in the flange of the opening. It is preferable that the bolt hole group and the third bolt hole group that are arranged at equal intervals along the circumferential direction are formed. By using the first bolt hole group for the flange connection of the cover, the effect of pressing the fluid control is enhanced.

A part of the second bolt hole group preferably also serves as a part of the third bolt hole group. According to such a configuration, the total number of bolt holes formed in the flange of the opening can be suppressed, which contributes to ensuring the strength of the flange and reducing processing costs. For example, the third bolt hole group is composed of four near-side bolt holes relatively close to the pipe axis and four far-side bolt holes relatively far from the pipe axis, which are arranged so as to sandwich the pipe axis in a plan view. and the second bolt hole group includes four intermediate bolt holes positioned between the near side bolt hole and the far side bolt hole, and four near side bolt holes. be.

When the cover body is divided into three regions in the pipe axial direction with reference to the inner edges of the pair of pressing surfaces, the first bolt hole group is located in both end regions avoiding the central region. is preferred. As a result, the effect of pressing the fluid control with the lid can be enhanced appropriately.

The fluid control installation method of the present disclosure includes an installation step of installing a fluid control inside a housing through an opening provided in the upper part of the housing that sealingly surrounds a fluid pipe, and a lid on the opening. a covering step for preventing the fluid control from leaking out from the opening by flange-connecting the body, wherein in the covering step, the fluid control is provided on the fluid control and is spaced apart in the pipe axis direction. A pair of pressed surfaces provided on the lid body is pressed from above by a pair of pressing surfaces provided on the lid. According to this method, it is possible to install the fluid control on which a force tilting in the direction of the pipe axis acts in an appropriate posture.

A first bolt hole group is formed in the flange of the cover so as to be unevenly distributed on the tube axis side in plan view, and a second bolt hole group corresponding to the first bolt hole group is formed in the flange of the opening. A group of bolt holes and a group of third bolt holes arranged at equal intervals along the circumferential direction are formed, and in the installation step, the connecting member is inserted into the opening using the third group of bolt holes. It is preferable that, in the flange connection and the covering step, the lid body is flange-connected to the opening using the second bolt hole group after removing the connecting member from the opening. By using the first bolt hole group for the flange connection of the cover, the effect of pressing the fluid control is enhanced.

Sectional view showing the state before cutting the water pipe Sectional view showing the state before inserting the fluid control into the housing Sectional view showing a state in which the fluid control is inserted into the housing Front view showing the completed installation of the fluid control (A) A plan view and (B) a side view showing a state in which the installation of the fluid control is completed Side view partial cross-sectional view showing the state where the installation of the fluid control is completed FIG. 7 is a plan view of the valve device shown in FIG. 6; (A) Plan view, (B) side half-sectional view, and (C) bottom view of the lid Top view of the opening of the housing (A) plan view, (B) side half sectional view, and (C) bottom view of attachment

This embodiment will be described with reference to the drawings. FIG. 1 shows an existing water pipe P (an example of a fluid pipe) that constitutes part of a pipeline. The water pipe P is a ductile cast iron pipe for water supply buried underground, but is not limited to this. The water pipe P is formed in a circular cross-sectional view, and its inner peripheral surface is coated with powder or the like. In the present embodiment, the water pipe P hermetically surrounded by the housing 1 is cut in an uninterrupted state (i.e., in an uninterrupted state), and through the opening 15 provided at the top of the housing 1, the control An example in which a valve device 7 (see FIGS. 2 and 3), which is an example of fluid, is installed inside the housing 1 is shown.

The housing 1 hermetically surrounds a portion of the water pipe P in a state of water flow. The housing 1 has a split structure that can be fitted onto the existing water pipe P, and more specifically, has an upper and lower split structure in which an upper member 11 and a lower member 12 are joined to each other. This joining is performed by a fastener 13 (see FIGS. 4 and 5) consisting of a bolt and a nut, but it may be joined by welding or the like instead. A bottom portion 1b of the housing 1 is formed in a mortar shape. A discharge hole 14 is provided at the center of the bottom portion 1b for discharging chips generated during cutting.

The housing 1 is composed of a split T-shaped pipe, and has a branch-shaped opening 15 projecting upward in a direction intersecting with the pipe axis direction PD (perpendicular to the paper surface of FIG. 1) of the water pipe P. . The opening 15 has a circular shape in plan view (see FIG. 9). A working valve (working gate valve) 3 and a sealing case 4 are connected to the opening 15 via a tubular attachment 2 . A gap between the opening 15 and the attachment 2 is sealed with an annular sealing material 21 . In FIG. 1, the work valve 3 is in a closed state, and the internal space of the housing 1 and the internal space of the sealing case 4 are separated by the valve body 3v. A cutting machine 5 is connected to the sealed case 4 . The cutting machine 5 has a hole saw 51 for cutting the water pipe P inside the housing 1 .

By opening the work valve 3 in the state shown in FIG. 1 and inserting the hole saw 51 into the housing 1 through the opening 15, the water pipe P is cut without water interruption. In this embodiment, a so-called full-cut cutting is performed to cut the water pipe P in the pipe axial direction PD (see FIG. 6). Chips generated by cutting are discharged to the outside by operating the valve 14v to temporarily open the discharge hole 14. FIG. When the cutting is completed, the hole saw 51 is lifted to close the work valve 3, the sealing case 4 and the cutting machine 5 are removed, and the sealing case 6 shown in FIG. 2 is connected instead.

A valve device 7 as a fluid control is arranged inside the sealed case 6 . The valve device 7 includes a circular closing portion 71 that closes the opening 15, a valve seat portion 72 arranged between a pair of cut surfaces formed in the water pipe P, and a It comprises a valve operating shaft 73 for operating a valve body (not shown) and a packing box 74 containing packing for sealing the valve operating shaft 73 . The valve device 7 is configured to open and close the hole 75 provided in the valve seat portion 72 by operating the valve operating shaft 73 to operate the valve body, thereby controlling the flow of water in the water pipe P. ing.

A packing and an anti-corrosion member (anti-corrosion ring) are attached to the outer surface of the valve device 7, but they are not shown in the drawings, and the same applies to other drawings. This packing seals between the inner surface of the housing 1 and the outer surface of the valve device 7 . The anti-corrosion member adheres to the water pipe P when the valve device 7 is inserted into the housing 1, and prevents the cut surface from being exposed to perform anti-corrosion treatment. For specific configurations of the packing and the anti-corrosion member, for example, JP-A-2018-189117 filed by the present applicant can be referred to. However, the structure is not limited to this, and for example, a structure that does not use an anti-corrosion member may be used.

An inserter 8 is connected to the sealed case 6 . The insertion machine 8 includes an operating rod 81 that supports the valve device 7 so that it can move up and down. 2, the operating valve 3 is opened, the operation rod 81 is pushed down, and the valve device 7 is inserted into the housing 1 through the opening 15, so that the gap between the pair of cut surfaces is shown in FIG. A valve device 7 is arranged. After that, the temporary fixation bolt 16b as a temporary fixer attached to the housing 1 is screwed and engaged with the outer surface of the valve device 7, thereby temporarily fixing (temporarily fixing) the valve device 7. As shown in FIG. After temporarily fixing the valve device 7 , the inserter 8 , the sealing case 6 and the working valve 3 are removed, and the attachment 2 is removed from the opening 15 .

Then, as shown in FIGS. 4 and 5 , the lid 9 is attached to the opening 15 and the valve device 7 is fixed to the housing 1 . The opening 15 and the lid 9 are provided with a flange 15f and a flange 9f, respectively, which are connected to each other. Thus, the lid 9 is flange-connected to the opening 15 in place of the attachment 2 after the valve device 7 is installed inside the housing 1 . Once the lid body 9 is attached, temporary fixing becomes unnecessary, so the temporary fixing bolt 16b may be removed from the housing 1 and the plug 16p may be attached instead. A plug 14 p is attached to the discharge hole 14 . Although the detachment prevention metal fittings 17 are attached to both ends of the housing 1 in this embodiment, the present invention is not limited to this.

FIG. 6 is a longitudinal sectional view corresponding to FIG. 5(B). However, the valve device 7 is shown by removing the valve operation shaft 73, the valve body and the packing box 74, and showing the external appearance instead of the cross section. Also, the detachment prevention metal fitting 17 is not shown. The lid 9 is flange-connected to the opening 15 via fasteners 18 consisting of bolts and nuts. A gap between the inner surface of the opening 15 and the closing portion 71 that closes the opening 15 is sealed with a packing (not shown). A groove 71g for mounting the packing is formed on the outer circumference of the closing portion 71. As shown in FIG.

As described above, the fluid control installation structure 10 of the present embodiment includes a housing 1 surrounding the water pipe P in a sealed manner, a valve device 7 as a fluid control installed inside the housing 1, the housing 1 and a lid 9 flange-connected to an opening 15 provided in the upper part of the . As shown in FIGS. 6 to 8, the valve device 7 has a pair of pressed surfaces 7s, 7s that are spaced apart in the pipe axis direction PD. It has a pair of pressing surfaces 9s, 9s that presses the pair of pressed surfaces 7s, 7s from above so that the pair of pressed surfaces 7s, 7s do not come out.

In addition, in the fluid control installation method of the present embodiment, the valve device 7 as a fluid control is installed inside the housing 1 through the opening 15 provided in the upper part of the housing 1 surrounding the water pipe P in a sealed manner. An installation step (installation step) and a step of preventing the valve device 7 from slipping out of the opening 15 by flange-connecting the lid 9 to the opening 15 (covering step) are provided. In the covering step, a pair of pressed surfaces 7s, 7s provided on the valve device 7 and spaced apart in the pipe axis direction PD are pushed upward by a pair of pressing surfaces 9s, 9s provided on the lid body 9. press from

The pair of pressed surfaces 7s, 7s are provided on one side and the other side in the pipe axial direction PD with the central axis 15a of the opening 15 interposed therebetween. The pair of pressed surfaces 7s, 7s are located on the pipe axis Pa of the water pipe P in plan view. In this embodiment, a pair of pressed surfaces 7s, 7s are provided at both end portions of the upper surface of the closing portion 71 in the pipe axis direction PD. The pressed surface 7 s extends in the orthogonal direction CD along the outer peripheral edge of the closing portion 71 . The orthogonal direction CD is a direction orthogonal to the tube axis direction PD in plan view. The pressed surface 7s has a shape longer in the orthogonal direction CD than in the pipe axial direction PD.

A pair of pressing surfaces 9 s and 9 s are provided on one side and the other side in the pipe axial direction PD with the central portion of the lid body 9 interposed therebetween. A hole 91 in which the packing box 74 is arranged is formed in the center of the lid 9 . The pair of pressing surfaces 9s, 9s are located on the pipe axis Pa of the water pipe P in plan view. The pressing surface 9s extends along the inner peripheral edge of the lid 9 in the orthogonal direction CD. The pressing surface 9s has a shape that is longer in the orthogonal direction CD than in the tube axial direction PD. The pressing surface 9s is configured to be in surface contact with the pressed surface 7s.

The lid 9 fixes the valve device 7 to the housing 1 by pressing the closing portion 71 downward. The pressing force acts on a pair of pressed surfaces 7s, 7s spaced apart in the pipe axis direction PD, and can be adjusted according to tightening of fasteners 18 used for flange connection. Therefore, it is possible to install the valve device 7 in an appropriate posture on which a force that tilts in the pipe axis direction PD acts due to the mortar-shaped bottom portion 1b, water pressure, or the like. In addition, since it is not necessary to set a pressing portion at both ends of the blocking portion 71 in the orthogonal direction CD, it is easy to secure the size of the valve body, which leads to a reduction in the size of the hole saw 51 and, in turn, the size of the cutting machine 5. To contribute.

As shown in FIG. 6, the pressed surface 7s is inclined downward with increasing distance from the central axis 15a of the opening 15, and the pressed surface 9s is inclined in the same direction as the pressed surface 7s. Therefore, the effect of centering the valve device 7 can be obtained. In the present embodiment, these are tapered with a curvature and can be centered not only in the pipe axis direction PD but also in the orthogonal direction CD. Each of the pressed surface 7s and the pressing surface 9s may have a shape that slopes upward with increasing distance from the central axis 15a. The pressed surface 7s is formed so as to protrude from the upper surface of the closing portion 71, but is not limited thereto.

As shown in FIG. 8, the flange 9f of the lid body 9 has a circular shape in plan view. A first bolt hole group G1 is formed in the flange 9f so as to be unevenly distributed on the pipe axis Pa side in plan view. The first bolt hole group G1 is composed of a plurality of (eight in this embodiment) bolt holes 9h, which are not arranged at equal intervals along the circumferential direction but are arranged closer to the pipe axis Pa. ing. In this embodiment, the flange 9f does not have a bolt hole corresponding to the far-side bolt hole 15d, which will be described later, but it is not limited to this.

As shown in FIG. 9, the flange 15f of the opening 15 has a circular shape in plan view. The flange 15f is formed with a second bolt hole group G2 corresponding to the first bolt hole group G1 and a third bolt hole group G3 equally spaced along the circumferential direction. In FIG. 9A, the bolt holes forming the second bolt hole group G2 are surrounded by a broken line frame, and in FIG. 9B, the bolt holes forming the third bolt hole group G3 are surrounded by a broken line frame. In this embodiment, each of the second bolt hole group G2 and the third bolt hole group G3 is composed of eight bolt holes. However, since part of the second bolt hole group G2 also serves as part of the third bolt hole group G3, the total number of bolt holes formed in the flange 15f is twelve.

The third bolt hole group G3 includes four near-side bolt holes 15n that are arranged to sandwich the pipe axis Pa in a plan view and that are relatively close to the pipe axis Pa, and four far-side bolt holes 15d that are relatively far from the pipe axis Pa. , which are equally spaced at 45 degree intervals. This "equidistant interval" is not limited to a configuration with exactly the same interval, but is a concept that includes a configuration in which positions are shifted due to dimensional errors or design errors. The second bolt hole group G2 consists of four intermediate bolt holes 15m located between the proximal bolt hole 15n and the distal bolt hole 15d, and four proximal bolt holes 15n. In FIG. 9B, the proximal bolt hole 15n is indicated by a dashed frame Fn, the far side bolt hole 15d is indicated by a dashed frame Fd, and the intermediate bolt hole 15m is not indicated by a dashed frame.

Since the first bolt hole group G1 and the corresponding second bolt hole group G2 are used for flange connection of the lid 9, the fastener 18 for fastening the lid 9 to the opening 15 is It is arranged so as to be unevenly distributed on the tube axis Pa side (see FIG. 5(A)). Therefore, the effect of pressing the valve device 7 via the pair of pressed surfaces 7s, 7s is enhanced. It is also possible to form bolt holes corresponding to the far side bolt holes 15d in the flange 9f and attach the fasteners 18 to them. There is fear. Therefore, it is preferable that the flange 9f does not have a bolt hole corresponding to the distal bolt hole 15d.

From the viewpoint of increasing the pressing effect of the valve device 7 by unevenly distributing the first bolt hole group G1 on the side of the pipe axis Pa, as shown in FIG. When the body 9 is divided into three regions A1 to A3 in the pipe axial direction PD, (the respective bolt holes 9h constituting the first bolt hole group G1) are arranged in the regions A1 and A3 at both ends avoiding the central region A2. preferably located. A boundary line BL that divides the area extends linearly in the orthogonal direction CD and touches the inner edge of the pressing surface 9s.

The center of each bolt hole 9h that constitutes the first bolt hole group G1 extends in the pipe axis direction PD in plan view with the center of the lid 9 as a reference (or passes through the center of the lid 9). It is preferably positioned within an angle range X1 that is ±45 degrees from the straight line). Further, when the first bolt hole group G1 is composed of eight bolt holes 9h, the center of the bolt hole 9h relatively close to the pipe axis Pa in plan view is ±33.75 degrees from the pipe axis Pa. It is preferable to be positioned within the angle range X2 where However, when the bolt holes (near side bolt holes 15n) of the opening 15 corresponding to them also serve as a part of the third bolt hole group G3, the angle range X3 of ±22.5 degrees from the tube axis Pa preferably located.

As shown in FIG. 10, the flange 2f of the attachment 2 has a circular shape in plan view. A fourth bolt hole group G4 corresponding to the third bolt hole group G3 is formed in the flange 2f. The fourth bolt hole group G4 is composed of a plurality of (eight in this embodiment) bolt holes 2h, which are arranged at equal intervals along the circumferential direction. In the installation process of installing the valve device 7 inside the housing 1, the attachment 2 (corresponding to a connection member) is flange-connected to the opening 15 using the third bolt hole group G3 (and the fourth bolt hole group G4). (see Figures 1 and 2). As a result, a substantially uniform force acts between the flanges in the circumferential direction, which is convenient for sealing the gap via the annular seal material 21 .

As described above, in the covering step of flange-connecting the lid body 9 to the opening 15, after the attachment 2 is removed from the opening 15, the second bolt hole group G2 (and the first bolt hole group G1) are used. Then, the lid 9 is flange-connected to the opening 15 . As described above, in the fluid control installation method of the present embodiment, the bolt holes used for flange connection of the attachment 2 in the installation process are made different from the bolt holes used for flange connection of the cover body 9 in the lid covering process. Further, since a part of the second bolt hole group G2 also serves as a part of the third bolt hole group G3, it contributes to ensuring the strength of the flange 15f and reducing the machining cost of the bolt holes.

The flange 15f of the opening 15 has a plurality of bolt holes (third bolt hole group G3) for connecting connecting members such as the attachment 2 and a plurality of bolt holes (second bolt hole group G3) for connecting the cover 9. Since the hole group G2) is mixed, it is preferable to provide an identification mark so as not to confuse the operator. The identification mark is not particularly limited, but can be provided using, for example, casting, paint, seal, or the like.

In the present embodiment, an example is shown in which the connection member to be flange-connected to the opening 15 in the installation process is the attachment 2, but the present invention is not limited to this. For example, when a working valve that can be flange-connected to the opening 15 is used, the working valve may be flange-connected to the opening 15 as a connection member without interposing the attachment 2 . In this case, a plurality of bolt holes corresponding to the third bolt hole group G3 of the opening 15 are formed in the flange of the working valve.

In this embodiment, an example is shown in which each of the first to fourth bolt hole groups G1 to G4 is composed of eight bolt holes. may be configured. However, when the diameter of the fluid pipe is 150 mm or more, it is preferable that the fluid pipe is configured with eight or more bolt holes as in the present embodiment. Moreover, in view of workability when mounting the fastener 18, it is preferable that no bolt hole is formed at a position through which the pipe axis Pa passes in a plan view.

In this embodiment, an example in which the valve device 7 is a sluice valve is shown, but it is not limited to this, and may be, for example, a switching valve or a butterfly valve. Further, the fluid control is not limited to a valve device as long as it controls the flow of fluid in the fluid pipe, and may be, for example, a plug device.

In this embodiment, an example in which the fluid pipe is a water pipe is shown, but the present invention is not limited to this, and may be a fluid pipe used for liquids other than water, gas, or a gas-liquid mixture.

The present invention is by no means limited to the above-described embodiments, and various modifications and improvements are possible without departing from the scope of the present invention.

1 housing 2 attachment (an example of a connecting member)
2f Attachment flange 3 Work valve 7 Valve device (an example of fluid control)
7s Pressed surface 9 Lid 9f Flange 9h Bolt hole 9s Pressing surface 10 Fluid control installation structure 15 Opening 15a Opening center axis 15d Far side bolt hole 15f Opening flange 15m Intermediate bolt hole 15n Near side bolt hole G1 1st bolt hole group G2 2nd bolt hole group G3 3rd bolt hole group G4 4th bolt hole group P water pipe (an example of a fluid pipe)
Pa Tube axis PD Tube axis direction

Claims (7)

A housing sealingly surrounding a fluid pipe, a fluid control installed inside the housing, and a lid body flange-connected to an opening provided at the top of the housing,
The fluid control has a pair of pressed surfaces spaced apart in the pipe axis direction,
The lid has a pair of pressing surfaces that press the pair of pressed surfaces from above so that the restricting fluid does not escape from the opening,
The fluid control installation structure, wherein the pressed surface is inclined downward or upward with distance from the central axis of the opening, and the pressed surface is inclined in the same direction as the pressed surface. A housing sealingly surrounding a fluid pipe, a fluid control installed inside the housing, and a lid body flange-connected to an opening provided at the top of the housing,
The fluid control has a pair of pressed surfaces spaced apart in the pipe axis direction,
The lid has a pair of pressing surfaces that press the pair of pressed surfaces from above so that the restricting fluid does not escape from the opening,
A first bolt hole group is formed in the flange of the lid so as to be unevenly distributed on the tube axis side in a plan view,
A fluid control installation structure in which a second bolt hole group corresponding to the first bolt hole group and a third bolt hole group arranged at equal intervals along the circumferential direction are formed in the flange of the opening. . 3. The fluid control installation structure according to claim 2 , wherein a part of said second bolt hole group also serves as a part of said third bolt hole group. The third bolt hole group is arranged so as to sandwich the pipe axis in a plan view and is composed of four near side bolt holes relatively close to the pipe axis and four far side bolt holes relatively far from the pipe axis,
4. The second group of bolt holes according to claim 3 , wherein said second group of bolt holes consists of four intermediate bolt holes located between said proximal and distal bolt holes and four said proximal bolt holes. fluid control installation structure. When the cover body is divided into three regions in the pipe axial direction with reference to the inner edges of the pair of pressing surfaces, the first bolt hole group is located in both end regions avoiding the central region. The fluid control installation structure according to any one of claims 2 to 4 . an installation step of installing a fluid control inside the housing via an opening in the top of the housing that sealingly surrounds the fluid conduit;
a lid-covering step for preventing the flow control from leaking out of the opening by flange-connecting the lid to the opening;
In the lid-covering step, a pair of pressed surfaces provided on the fluid control and spaced apart in the pipe axis direction are pressed from above by a pair of pressing surfaces provided on the lid ,
The fluid control installation method, wherein the pressed surface is inclined downward or upward with distance from the central axis of the opening, and the pressed surface is inclined in the same direction as the pressed surface. an installation step of installing a fluid control inside the housing via an opening in the top of the housing that sealingly surrounds the fluid conduit;
a lid-covering step for preventing the flow control from leaking out of the opening by flange-connecting the lid to the opening;
In the lid-covering step, a pair of pressed surfaces provided on the fluid control and spaced apart in the pipe axis direction are pressed from above by a pair of pressing surfaces provided on the lid,
A first bolt hole group is formed in the flange of the lid so as to be unevenly distributed on the tube axis side in plan view, and a second bolt hole group corresponding to the first bolt hole group is formed in the flange of the opening. A bolt hole group and a third bolt hole group arranged at equal intervals along the circumferential direction are formed,
In the installation step, a connection member is flange-connected to the opening using the third bolt hole group;
In the covering step, after removing the connecting member from the opening, the lid is flange- connected to the opening using the second bolt hole group.

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