JP7511273B2 - How to install a gate valve - Google Patents

Description

The present invention relates to a method for installing a gate valve having a valve box and a valve cover.

Conventionally, a gate valve in which the valve body and valve cover can be separated is known (see, for example, Patent Document 1).

The gate valve of Patent Document 1 is configured so that a valve cover (operating part main body in the document) with an operating shaft can be detachably attached to a valve box (water stop part main body in the document) in which a plate-shaped valve body is housed. A metal fitting with a U-shaped notch is fixed to the outer end of the valve body, and a rectangular push plate is fixed to the tip of the operating shaft. With the push plate inserted into the U-shaped notch and the operating shaft connected to the valve body, the valve cover is fastened to the valve box, and the valve is used as a work gate valve that can block the flow path of a fluid pipe.

Japanese Utility Model Application Publication No. 5-52493

When blocking the flow path of a large-diameter fluid pipe (e.g., 1000 mm diameter), the valve box and valve cover become large, and the weight of the service gate valve becomes extremely heavy. For this reason, when installing a service gate valve with the valve cover fixed to the valve box on the fluid pipe, the heavy machinery used to suspend the service gate valve becomes large, increasing construction costs. Moreover, the use of large heavy machinery results in a large area of road occupation, limiting work time and reducing work efficiency.

In addition, in the case of a gate valve such as that in Patent Document 1, where the push plate of the operating shaft can be inserted into a U-shaped notch provided at the end of the valve body, it is extremely difficult to align the push plate with the U-shaped notch while a large valve cover is hanging, reducing work efficiency.

Therefore, there is a need for a method of installing a gate valve that is highly efficient, even when blocking the flow path of a large-diameter fluid pipe.

The feature of the gate valve installation method of the present invention is that it is a method for installing a gate valve that opens and closes by sliding the valve element horizontally, and includes a case mounting step of mounting a case so as to surround a fluid pipe in a sealed state, a valve box mounting step of mounting a valve box having a valve element movement space to the case, a valve cover moving step of suspending a valve cover having a valve element accommodating space by a crane and moving the valve cover horizontally toward the opening of the valve box so that the axis of the valve cover coincides with the axis of the valve box, and a fastening step of fastening the valve box and the valve cover.

In this method, a valve box having a valve disc movement space and a valve cover having a valve disc accommodation space are installed separately and both components are fastened together. Therefore, even if the gate valve is heavy, it is possible to install the valve box and valve cover separately at the construction site, which makes it possible to miniaturize heavy machinery and reduce construction costs. Moreover, installation of the gate valve is completed by moving the valve cover having the valve disc accommodation space to the opening of the valve box having the valve disc movement space and then fastening the two components together, resulting in high work efficiency. Therefore, a gate valve installation method with high work efficiency has been provided, even when blocking the flow path of a large-diameter fluid pipe.

Another feature is that in the valve cover moving process, a part of the valve body that is housed in the valve body housing space and protrudes from the valve cover is inserted into the valve box to move the valve cover.

According to this method, the protruding portion of the valve body housed in the valve cover is caused to protrude outside the valve cover, and this protruding portion is inserted into the opening of the valve box. Since the protruding portion is part of the valve body that blocks the flow path of the fluid pipe, which is constructed with a large diameter, it has a large surface area and is highly visible. As a result, even when the heavy valve cover is suspended, it is easy to insert the protruding portion into the opening of the valve box, and the work efficiency is high.

Another feature is that in the valve cover moving process, a pin member fixed to a first end face of either the valve box or the valve cover is inserted into a recess formed in a second end face of the other of the valve box or the valve cover to align the axis of the valve cover with the axis of the valve box.

As in this method, by configuring the axis adjustment with a pin member and a recess, it is possible to reduce manufacturing costs by simply preparing the pin member and machining the end faces of the valve body and valve cover.

Another feature is that in the valve cover moving process, the valve cover, which houses the valve body in the valve body housing space, is pushed up by a bolt screwed into a hole formed in the bottom of the valve cover, so that the axis of the valve body is aligned with the axis of the valve body.

As in this configuration, if the valve disc is pushed up by a bolt whose position can be adjusted by the degree of screwing, it becomes possible to adjust the position of the valve disc at the construction site even if there is a misalignment between the opening of the valve box and the valve disc. As a result, there is no need to lift the valve cover again to adjust the position of the valve disc, improving work efficiency.

Another feature is that in the valve cover moving process, the wheels on the valve body housed in the valve body housing space are placed on rails on the valve box, thereby aligning the axis of the valve body with the axis of the valve box.

With this method, the valve cover can be positioned relative to the valve box simply by placing the wheels on the valve body housed in the valve cover on the rails on the valve box.

The gate valve according to the present invention is characterized in that it comprises a valve box attached to a fluid pipe, a valve cover containing a plate-shaped valve body, and a fastening mechanism for fastening the valve box and the valve cover, and the valve body is integrally formed with a main body located inside the valve cover and a protrusion protruding to the outside of the valve cover before the valve cover is fastened to the valve box, and is provided with a guide mechanism for guiding the insertion of the protrusion into the opening of the valve box.

In this configuration, the valve box and the valve cover housing the valve element are constructed separately and integrated with a fastening mechanism. Therefore, even if the gate valve is heavy, it is possible to install the valve box and valve cover separately at the construction site, which allows for the downsizing of heavy machinery and reduces construction costs.

In addition, according to this configuration, the protruding portion of the valve body housed in the valve cover is caused to protrude outside the valve cover, and this protruding portion is inserted into the opening of the valve box. Since the protruding portion is part of the valve body that blocks the flow path of the fluid pipe that is configured with a large diameter, it has a large surface area and is highly visible. As a result, even when the heavy valve cover is suspended, it is easy to insert the protruding portion into the opening of the valve box, and the work efficiency is high.

Moreover, by providing a guide mechanism that guides the insertion of the protrusion into the opening of the valve box, as in this configuration, the work efficiency can be further improved. Therefore, a gate valve with high work efficiency can be provided, even when blocking the flow path of a large-diameter fluid pipe.

Another characteristic feature is that the guide mechanism has a first wheel fixed to the protrusion and a first rail fixed to the bottom of the opening of the valve box, along which the first wheel slides.

As in this configuration, by providing a first wheel on the protruding portion that protrudes outward from the valve cover and providing a first rail on the bottom of the opening of the valve box, the valve cover can be positioned relative to the valve box simply by placing the first wheel on the first rail.

Another characteristic feature is that the guide mechanism has a push-up mechanism that can push up the valve body.

Because the valve disc has a certain length, the protruding portion of the valve disc may sag slightly relative to the parallel position of the valve box. By providing a push-up mechanism that pushes up the valve disc as in this configuration, the protruding portion can be inserted into the opening of the valve box with the axis of the valve disc and the axis of the valve cover aligned. As a result, simply by inserting the protruding portion, which is in a parallel position, into the opening of the valve box, the axes of the valve box and the valve cover are aligned, facilitating the fastening work of the two components.

Another characteristic feature is that the push-up mechanism is composed of a bolt that is screwed into a hole formed in the bottom of the valve lid.

As in this configuration, if the lifting mechanism is configured with a bolt whose position can be adjusted by the degree of screwing, it becomes possible to adjust the position of the valve disc at the construction site even if there is a misalignment between the opening of the valve box and the protruding part of the valve disc. As a result, there is no need to lift the valve cover again to adjust the position of the valve disc, which improves work efficiency.

Another characteristic feature is that a second wheel is fixed to the main body, and a second rail along which the second wheel slides is fixed to the bottom of the valve cover.

As in this configuration, by providing a second wheel on the main body of the valve body located inside the valve cover and providing a second rail on the bottom of the valve cover, the heavy valve body can be moved smoothly after the valve cover and the valve box are fastened together.

Another characteristic feature is that the guide mechanism is composed of a pin member fixed to a first end surface of either the valve box or the valve cover, and a recess formed in a second end surface of the other of the valve box or the valve cover, into which the pin member can be inserted.

As in this configuration, if the guide mechanism is configured with a pin member and a recess, it is only necessary to prepare the pin member and machine the end faces of the valve body and valve cover, thereby reducing manufacturing costs.

Another characteristic feature is that a push bolt is provided at one end of either the valve box or the valve cover to separate the valve cover from the valve box.

By providing a pressure bolt to separate the valve cover from the valve box as in this configuration, the valve box and the valve cover can be easily separated even if they are stuck together. Therefore, even when removing the gate valve, the valve cover and the valve box can be lifted separately, which allows for the downsizing of heavy machinery and reduces construction costs.

FIG. 4 is a side view showing the gate valve attached to the fluid pipe. FIG. FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. FIG. 5 is a view taken along line VV in FIG. 4. FIG. 4 shows a third end surface of the valve cover. FIG. FIG. FIG. 2 is a diagram showing the state in which the wheels are mounted on the rails. FIG. 4 is a side cross-sectional view showing the valve lid attached to the valve body. FIG. 4 is a side cross-sectional view showing a valve closed state. FIG. 4 is a side cross-sectional view showing the state in which the valve cover is removed from the valve body. FIG. 4 is a side cross-sectional view showing the valve body attached to the fluid pipe. FIG. 4 is a side cross-sectional view showing the state in which the valve cover is attached to the valve body. FIG. 11 is a side cross-sectional view showing the state in which the drilling device is being removed. 10 is a side cross-sectional view showing a state in which a branch pipe joint is installed in the pipe cutting section. FIG.

Below, an embodiment of the gate valve and gate valve installation method according to the present invention will be described with reference to the drawings. In this embodiment, an example of a gate valve will be described as a work gate valve X that is attached to a water pipe 1. However, the present invention is not limited to the following embodiment, and various modifications are possible within the scope of the gist of the present invention.

Figures 13 to 16 show an example of a branch pipe fitting installation method in which a water pipe 1 (an example of a fluid pipe) buried underground is drilled in the middle in an uninterrupted flow state (a state in which the flow of water as a fluid is maintained), cut off in the pipe axial direction, and then a branch pipe fitting 57 is installed at the cut pipe section. The work gate valve X (an example of a gate valve) in this embodiment will be described as being used in this branch pipe fitting installation method.

As shown in FIG. 1, the work gate valve X comprises a valve box 2 and a valve cover 3, and the valve box 2 is attached to the water pipe 1. Specifically, a half-split lower case 10 attached from below the water pipe 1 exposed in the excavation area K and a half-split T-shaped upper case 11 attached from above the water pipe 1 are connected with bolts, nuts, etc., and the valve box 2 is connected to the branch pipe section 11A of the upper case 11 with bolts, nuts, etc. In addition, a first flange portion 21 formed to protrude radially outward around the circumferential direction of the end of the valve box 2 and a second flange portion 31 formed to protrude radially outward around the circumferential direction of the end of the valve cover 3 are fastened with bolts 21a and nuts 31a (an example of a fastening mechanism). Note that nuts 31a may be provided on the side of the first flange portion 21, and bolts 21a may be provided on the side of the second flange portion 31.

As shown in Figures 2 and 3, the valve box 2 is composed of a rectangular housing in a plan view, and a rectangular fluid flow hole 22 is formed in the center of the valve box 2, through which tap water flows from the cut section of the water pipe 1 after drilling via the branch pipe section 11A, penetrating in the vertical direction. Inside the valve box 2, a valve body movement space 20 is formed in which the valve body 4 described below can move, and this valve body movement space 20 is connected to the fluid flow hole 22. The valve body movement space 20 is an area surrounded by an opening 23 that opens the end on the valve lid 3 side, a bottom wall 24a and an upper wall 24b formed around the fluid flow hole 22, and a side wall 25 formed at the end opposite the valve lid 3.

The valve box 2 has a plurality of first through holes 26a (two in this embodiment) on the opening 23 side of the bottom wall 24a, and a plurality of second through holes 26b (two in this embodiment) on the side wall 25 side of the bottom wall 24a. The first through hole 26a and the second through hole 26b are formed as a boss that protrudes downward from the outer surface of the bottom wall 24a in a cylindrical shape, and the male thread of the first bolt B1 that pushes up the valve body 4 is screwed into the female thread of this boss. In addition, a pair of first rails 27 are fixed to the bottom wall 24a of the valve box 2 on both sides of the fluid flow hole 22 along the movement direction of the valve body 4. The first rail 27 has a length from the bottom 23a of the opening 23 to the end 22a on the side wall 25 side of the fluid flow hole 22. The first rail 27 has a base 27a on which the wheels 40 of the valve body 4 described later slide, and a restricting portion 27b that protrudes upward from the side of the base 27a and restricts the outward movement of the wheels 40 (see FIG. 9).

In addition, a plurality of pin members 28 are fixed to the first end surface 21b of the first flange portion 21, which corresponds to the peripheral portion of the opening 23 of the valve box 2. The pin members 28 have a tapered portion 28a that narrows in diameter toward the tip. Furthermore, a plurality of pressing bolts B3 that separate the valve cover 3 from the valve box 2 are inserted at equal intervals in the circumferential direction into the first flange portion 21. Note that the pressing bolts B3 may be omitted.

As shown in Figures 4 and 5, the valve cover 3 is composed of a rectangular housing in a plan view, and the plate-shaped valve body 4 is accommodated in the valve body accommodation space 30. Before the valve cover 3 is fastened to the valve box 2, a part of the valve body 4 (protrusion 41) protrudes to the outside from the opening 30a of the valve cover 3. The valve body accommodation space 30 is an area surrounded by the opening 30a, the bottom 30b, the upper wall 30c facing the bottom 30b, and the side wall 30d on the side of the base end 42a of the valve body 4. In addition, an operating unit 32 that moves the valve body 4 forward and backward in the horizontal direction (left and right direction in Figure 10) is fixed to the side wall 30d of the valve cover 3. This operating unit 32 has an operating shaft 32a formed with a male thread that is screwed into the female thread of a separate screw top (not shown) fixed to the base end 42a of the valve body 4, and an operating handle 32b that rotates the operating shaft 32a.

The valve cover 3 has a plurality of third through-holes 33 (two in this embodiment) on the opening 30a side of the bottom 30b. The third through-holes 33 are formed of a boss that protrudes downward from the outer surface of the bottom 30b in a cylindrical shape, and the male thread of the second bolt B2 (an example of a push-up mechanism) that pushes up the valve body 4 is screwed into the female thread of this boss. In addition, a pair of second rails 34 are fixed to the bottom 30b of the valve cover 3 on the outside of the third through-holes 33 along the movement direction of the valve body 4. The second rails 34 have a length from the base end 42a (near the side wall 30d) of the valve body 4 to the opening 30a of the valve cover 3. Like the first rail 27, the second rail 34 has a base 34a on which the wheels 40 of the valve body 4 slide, and a restricting portion 34b that protrudes upward from the side of the base 34a and restricts the outward movement of the wheels 40 (see FIG. 9). When the valve cover 3 is fastened to the valve box 2, the first rail 27 and the second rail 34 are connected.

In addition, a second end surface 31b of the second flange portion 31, which corresponds to the peripheral portion of the opening 30a of the valve lid 3, has a plurality of recesses 35 formed at positions corresponding to a plurality of pin members 28 fixed to the first end surface 21b when the first flange portion 21 and the second flange portion 31 are opposed to each other. Furthermore, as shown in FIG. 6, a rotation restricting portion 36 that restricts the rotation of the nut 31a, which is a hexagonal nut, is formed on a third end surface 31c opposite the second end surface 31b of the second flange portion 31 and protrudes in a position parallel to one side of the nut 31a.

As shown in Figures 7 and 8, the valve body 4 is formed in a rectangular plate shape in a plan view, and before the valve cover 3 is fastened to the valve box 2, the main body 42 located inside the valve cover 3 and the protrusion 41 protruding to the outside of the valve cover 3 are integrally formed (see Figure 4). A rectangular seal member S is fixed to the upper surface of the valve body 4, which abuts against the peripheral portion of the fluid flow hole 22 of the valve box 2 described above.

In addition, multiple wheels 40 (four in this embodiment) are fixed to the bottom of the valve body 4, and these wheels 40 are arranged in a position where they slide against the first rail 27 and the second rail 34. The multiple wheels 40 are composed of a pair of first wheels 40a located on the front side of the valve body 4 in the traveling direction, and a pair of second wheels 40b located on the rear side of the valve body 4 in the traveling direction. In other words, before the valve cover 3 is fastened to the valve box 2, the first wheels 40a are fixed to the protruding part 41 protruding to the outside of the valve cover 3, and the second wheels 40b are fixed to the base end part 42a of the main body part 42 located inside the valve cover 3. These wheels 40 are configured to be rotatable around the shaft member 46 supported by the support member 45 fixed to the bottom of the valve body 4 (see FIG. 9).

The valve body 4 also has a number of pushed-up parts 43 (four in this embodiment) that are pushed up by the first bolt B1 of the valve box 2 and protrude outward from the protruding part 41 and the base end part 42a. The pushed-up parts 43 are integrally formed with a vertical plate 43a fixed to the protruding part 41 and the base end part 42a, a horizontal plate 43b connected to the lower end of the vertical plate 43a, and a reinforcing plate 43c connected to the outer surfaces of the vertical plate 43a and the horizontal plate 43b.

As shown in Figure 10, at the construction site, the valve cover 3 housing the valve body 4 is attached to the valve box 2 attached to the water pipe 1. Therefore, even if the entire weight of the work gate valve X is large, the valve box 2 and the valve body 4 can be hung separately by heavy machinery, so the heavy machinery can be made smaller and construction costs can be reduced. At this time, the protruding portion 41 of the valve body 4 protruding outside the valve cover 3 is inserted into the opening 23 of the valve box 2. Since this protruding portion 41 is part of the valve body 4, it has a large surface area and is highly visible. As a result, even when the heavy valve cover 3 is hung by heavy machinery, the protruding portion 41 can be easily inserted into the opening 23 of the valve box 2.

In addition, in this embodiment, the first wheel 40a provided on the protruding portion 41 and the first rail 27 provided on the opening 23 of the valve box 2 constitute a guide mechanism that guides the insertion of the protruding portion 41 into the opening 23 of the valve box 2. In other words, when inserting the protruding portion 41 into the opening 23 of the valve box 2, the valve cover 3 can be positioned relative to the valve box 2 simply by placing the first wheel 40a on the first rail 27.

As described above, since the protruding portion 41 of the valve body 4 protrudes outside the valve cover 3, there is a risk that the valve body 4 may sag slightly downward relative to the attitude of the valve box 2. Therefore, in this embodiment, a guide mechanism (push-up mechanism) is configured to guide the insertion of the protruding portion 41 into the opening 23 of the valve box 2 by the second bolt B2 that can push up the valve body 4 by abutting against the bottom surface of the valve body 4. In other words, by pushing up the valve body 4 with the second bolt B2, the protruding portion 41 is inserted into the opening 23 of the valve box 2 with the axis of the valve body 4 and the axis of the valve cover 3 aligned, so that the axis of the valve cover 3 and the axis of the valve box 2 are aligned. As a result, the tightening operation of the bolt 21a and the nut 31a of the valve box 2 and the valve cover 3 is smoothed. Moreover, the second bolt B2 can be easily operated at the construction site, so even if it is difficult to insert the protruding portion 41 of the valve body 4 into the opening 23 of the valve box 2, the position of the valve body 4 can be adjusted and the valve cover 3 can be reliably attached to the valve box 2.

As shown in Figure 6, the third end surface 31c of the second flange portion 31 of the valve cover 3 is provided with a rotation restriction portion 36 that restricts the rotation of the nut 31a, which is a hexagonal nut, so that the valve box 2 and the valve cover 3 can be fastened together by simply rotating the bolt 21a. This eliminates the need to hold the nut 31a with a tool while screwing in the bolt 21a, and allows the fastening operation to be performed quickly and smoothly.

Furthermore, as shown in FIG. 10, the pin member 28 fixed to the first end surface 21b of the valve box 2 and the recess 35 formed in the second end surface 31b of the valve cover 3 constitute a guide mechanism that guides the insertion of the protruding portion 41 into the opening 23 of the valve box 2. In other words, by fitting the pin member 28 into the recess 35, the protruding portion 41 can be inserted into the opening 23 of the valve box 2 with the axis of the valve body 4 and the axis of the valve cover 3 aligned. In addition, the tapered portion 28a is provided at the tip of the pin member 28, making it easy to insert it into the recess 35. Alternatively, the recess 35 may be provided in the first end surface 21b of the valve box 2, and the pin member 28 may be fixed to the second end surface 31b of the valve cover 3.

Figure 11 shows the valve body 4 in a closed state. The valve body 4 is moved by pushing the operating part 32 until the pushed-up portion 43 of the valve body 4 approaches the side wall 25 of the valve box 2. Next, the first bolt B1 is rotated to abut the pushed-up portion 43, pushing up the valve body 4. As a result, the seal member S fixed to the upper surface of the valve body 4 abuts against the peripheral portion of the fluid flow hole portion 22 of the valve box 2 and is compressed, preventing tap water from flowing out downstream of the valve body 4.

When the first flange portion 21 and the second flange portion 31 are sealed with a sealing member (not shown), the first flange portion 21 and the second flange portion 31 may be fixed by the sealing member when removing the valve cover 3 from the valve box 2 after opening the valve body 4. Therefore, as shown in FIG. 12, in this embodiment, the pressing bolt B3 inserted into the first flange portion 21 is rotated to abut against the second flange portion 31, and the valve cover 3 is separated from the valve box 2. This makes it easy to remove even a heavy valve cover 3.

Next, a branch pipe joint installation method including a gate valve installation method according to this embodiment will be described with reference to Figures 13 to 16. The gate valve installation method includes the following steps (5) to (8), and the branch pipe joint installation method includes the following steps (1) to (13).

(1) As shown in FIG. 13, excavation is performed around the cutting area of the water pipe 1, and the lower part of the excavation area K is solidified with base concrete 51, and the water pipe 1 on the side of the cutting area is fixed with pipe fixing concrete 52.
(2) The two split joint rings 53 are attached to the water pipe 1 at predetermined positions between the cut area of the water pipe 1 and the pipe fixing concrete 52 (two positions on either side of the cut area in this embodiment).
(3) A cutter 54 is attached to the water pipe 1 between the pair of flanges 53.

(4) The lower case 10 and the upper case 11 are attached to the water pipe 1 in a sealed state so as to cover the flange 53 and the cutter 54, and a support member 55 such as an H-beam is installed between the base concrete 51 and the lower case 10 to support the load of the lower case 10 and the upper case 11.
(5) The valve box 2 is attached to the branch pipe section 11A of the upper case 11 with bolts, nuts, etc. In this way, the valve box 2 is attached to the water pipe 1.
(6) As shown in Figure 14, the valve cover 3 housing the valve body 4 with the protruding portion 41 protruding outward is hung by a crane or the like and moved toward the opening 23 of the valve box 2. At this time, the valve body is pushed up by the second bolt B2, so that the axis of the valve body 4 and the axis of the valve cover 3 are aligned.

(7) The protruding portion 41 is inserted into the opening 23 of the valve box 2 (see FIG. 10). At this time, the first wheel 40a fixed to the protruding portion 41 is placed on the first rail 27 of the valve box 2, and the pin member 28 fixed to the first end face 21b of the valve box 2 is inserted into the recess 35 formed in the second end face 31b of the valve cover 3. This causes the axis of the valve box 2 and the axis of the valve cover 3 to coincide with each other.
(8) The first flange portion 21 of the valve body 2 and the second flange portion 31 of the valve cover 3 are fastened together with the bolts 21a and nuts 31a (see FIG. 1). This completes the installation of the operational gate valve X.

(9) As shown in FIG. 15 , the upper housing 56 is connected to the work gate valve X in a sealed state, the electric operating rod 6 is connected to the cutter 54, and the cutter 54 is driven to cut the water pipe 1.
(10) The cutter 54 and the cut piece are lifted together into the upper housing 56, and the valve body 4 is closed. At this time, the first bolt B1 pushes up the valve body 4, compressing the seal member S fixed to the upper surface of the valve body 4 and preventing tap water from flowing downstream (see FIG. 11).
(11) Remove the cover 56 a of the upper housing 56 , and remove the cutter 54 and the piece from the electric operating rod 6 .

(12) As shown in Figure 16, the branch pipe joint 57 is attached to the electric operating rod 6, and the valve body 4 is opened to attach the branch pipe joint 57 to the pipe cutting section. At this time, the joint ring 53 is temporarily joined to the branch pipe joint 57 and the water pipe 1 by the push rod 58 provided on the upper case 11.
(13) The upper housing 56, the gate valve X, the upper case 11, and the lower case 10 are removed, and the branch pipe joint 57 is installed on the water pipe 1 by fastening the collar 53 and the branch pipe joint 57.
When removing the work gate valve X, as shown in Fig. 12, the pressing bolt B3 inserted into the first flange portion 21 is rotated to abut against the second flange portion 31, and the valve cover 3 is separated from the valve box 2. Then, the valve cover 3 and the valve box 2 are lifted separately by a crane or the like and removed. Note that the branch pipe joint 57 has the same structure as the branch pipe joint described in JP 2005-9184 A, and therefore a detailed description thereof will be omitted.

[Other embodiments] 1. The working gate valve X in the above-mentioned embodiment has been described as a gate valve used in a branch pipe joint installation method, but is not particularly limited as long as it is a gate valve used in a method that requires blocking a flow path. For example, the working gate valve X may be used in a repair valve installation method for installing a repair valve in a water pipe 1, or a fluid control valve installation method for connecting a fluid control valve to a water pipe 1.

2. In the above-described embodiment, the guide mechanism for guiding the insertion of the protruding portion 41 of the valve body 4 into the opening 23 of the valve box 2 is configured with three types of mechanisms: (a) a first wheel 40a provided on the protruding portion 41 and a first rail 27 provided on the opening 23 of the valve box 2, (b) a second bolt B2 that can abut against the bottom surface of the valve body 4 to push up the valve body 4, and (c) a pin member 28 fixed to the first end surface 21b of the valve box 2 and a recess 35 formed on the second end surface 31b of the valve cover 3. The configuration may be made up of any one or any two of these guide mechanisms.

3. At the work site, the valve cover 3 with the protruding portion 41 of the valve body 4 housed inside may be moved toward the opening 23 of the valve box 2 attached to the water pipe 1, and then the valve box 2 and the valve cover 3 may be fastened together.

4. The first rail 27 and the second rail 34 are not particularly limited as long as they have a structure that allows the wheels 40 of the valve body 4 to slide. For example, the restricting portions 27b and 34b in FIG. 9 may be provided on both sides of the base portions 27a and 34a.

5. The first bolt B1 and the second bolt B2 that push up the valve body 4 are not limited to bolts, and may be any structure capable of pushing up the valve body 4, such as a wedge member.

6. The plumbing work using the work gate valve X in the above-mentioned embodiment is merely an example, and can be used for various types of work that requires blocking the flow path of liquid or gas.

The present invention can be used for operational gate valves that block flow paths and for methods of installing operational gate valves.

1. Water pipes (fluid pipes)
2 Valve box 3 Valve cover 4 Valve body 21a Bolt (fastening mechanism)
21b First end surface 23 Opening 27 First rail (guide mechanism)
28 Pin member 31a Nut (fastening mechanism)
31b Second end surface 33 Third through hole portion (hole portion)
34 Second rail 35 Recess 40a First wheel (guide mechanism)
40b Second wheel 41 Protrusion 42 Main body B2 Second bolt (push-up mechanism, guide mechanism)
B3 Push bolt X Operation gate valve (gate valve)

Claims (5)

A method for installing a gate valve that opens and closes by sliding a valve disc in a horizontal direction, comprising the steps of:
a case mounting step of mounting a case so as to hermetically surround the fluid pipe;
a valve body mounting step of mounting a valve body having a valve body movement space to the case;
a valve cover moving step of suspending a valve cover having a valve body accommodating space by a crane and moving the valve cover in the horizontal direction toward an opening of the valve body so that an axis of the valve cover coincides with an axis of the valve body;
A method for installing a gate valve, comprising a fastening process for fastening the valve body and the valve cover. The gate valve installation method according to claim 1, wherein in the valve cover moving process, a portion of the valve body accommodated in the valve body accommodating space and protruding from the valve cover is inserted into the valve body to move the valve cover. The gate valve installation method according to claim 1 or 2, wherein in the valve cover moving step, a pin member fixed to a first end face of either the valve box or the valve cover is inserted into a recess formed in a second end face of the other of the valve box and the valve cover to align the axis of the valve cover with the axis of the valve box. A method for installing a check valve as described in claim 1 or 2, wherein in the valve cover moving process, the valve cover is pushed up by a bolt screwed into a hole formed in the bottom of the valve cover which accommodates the valve body in the valve body accommodating space, thereby aligning the axis of the valve body with the axis of the valve box. A method for installing a check valve as described in claim 1 or 2, wherein in the valve cover moving process, wheels provided on the valve body housed in the valve body accommodating space are positioned on rails provided on the valve box, thereby aligning the axis of the valve body with the axis of the valve box.

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