JP6018246B2 - Branch pipe connection device - Google Patents

Description

  The present invention relates to a branch pipe connection device that enables a branch pipe to be connected to a fluid pipe via a gate valve that incorporates a valve body that opens and closes a flow path in a valve box.

  In recent years, in branch pipe connection work in which a branch pipe is provided in the middle of an existing fluid pipe such as a water pipe, the peripheral wall of the fluid pipe is perforated while maintaining the state of uninterrupted water without stopping the pipe on the upstream side, A method of connecting branch pipes is used. In such a construction method, a branch valve having a built-in valve that displaces the flow path in the valve box in an openable / closable manner according to the operation of the valve shaft, and a branch case mounted around the perforated portion of the fluid pipe. A pipe connection device is used, and a branch pipe is connected to the branch case with a gate valve interposed therebetween.

  Patent Document 1 by the present applicant includes a branch pipe provided with a bifurcated case 91 divided into upper and lower parts, and a gate valve 92 that is connected with the end portion sandwiched between the split surfaces of the branch case 91 as shown in FIG. A connection device is disclosed. In this device, the split surface 90 of the branch case 91 is positioned in a substantially horizontal direction, and the branch case 91 and the gate valve 92 are connected by fastening of the split surface 90. Therefore, a large load in the pipe axis direction due to ground fluctuation or the like. Even if acted, the load is less likely to act in the direction in which the bolt of the fastener 98 extends, and the opening of the branch case 91 can be suppressed to effectively prevent fluid leakage.

  At the time of construction, as shown in FIG. 15, a punching device 96 is connected to the gate valve 92, the valve body 93 is raised, the cutter 97 is advanced, and the peripheral wall of the water pipe K is punched. When the drilling is completed, the cutter 97 is moved backward, the valve body 93 is lowered, and the inside of the gate valve 92 is shut off. Subsequently, the punching device 96 is removed from the gate valve 92, and a branch pipe (not shown) is connected instead. Then, if the valve body 93 is raised and the inside of the gate valve 92 is opened, water flows from the water pipe K to the branch pipe. According to such a construction method, since the branch pipe can be connected to the existing water pipe without water interruption, it is excellent in convenience.

  In the soft seal gate valve 92 used in the branch pipe connecting device as described above, the valve body 93 is strongly pressed against the inner peripheral surface of the valve box 94 and is brought into close contact with the valve body 94 in the radial direction. The space is sealed. The valve body 93 is formed by lining a thick seal rubber on the entire surface of a box-shaped body 93a, and a valve shaft 95 for operating the lifting and lowering of the valve body 93 is attached to the center of the body 93a. Based on such a configuration, in the gate valve 92, the thickness T9 of the valve body 93 is increased, and it is necessary to ensure a large inter-surface dimension L9 accordingly.

  When the face-to-face dimension of the gate valve is large in this way, the piercing stroke (cutter travel distance during piercing) becomes longer, leading to an increase in the size of the piercing device, and in some cases, the punching device needs to be specially customized. is there. In addition, a gate valve having a large inter-surface dimension is large and heavy, and thus is complicated to handle, resulting in a decrease in work efficiency and an increase in cost. On the other hand, simply reducing the thickness of the valve body reduces the area of the valve body that presses against the inner peripheral surface of the valve box, and increases the torque when shutting off the gate valve, which may impair the sealing function. is there.

JP 2007-309474 A

  This invention is made | formed in view of the said situation, The objective is to provide the branch pipe connection apparatus provided with the gate valve which can reduce the thickness of a valve body, without impairing a sealing function.

  The above object can be achieved by the present invention as described below. That is, the gate valve provided in the branch pipe connection device according to the present invention includes a valve box that forms a part of a pipe line, a closed position that blocks a flow path in the valve box, and an open position that opens the flow path. In a gate valve having a valve body that is displaced between and a valve shaft capable of operating the displacement of the valve body, the valve body is a plate-like shape that faces the valve shaft from one side in the tube axis direction at the open position. The valve body and the valve box in the closed position are sealed with a sealing material that is compressed in the tube axis direction.

  In this gate valve, since the valve body is formed by a plate-like body that faces the valve shaft from one side in the tube axis direction, the thickness of the valve body can be greatly reduced as compared with the prior art, and the distance between This can contribute to shortening the dimensions. Nevertheless, since the space between the valve body in the closed position and the valve box is sealed with a sealing material that is compressed in the tube axis direction, the valve body is pressed strongly against the inner peripheral surface of the valve box. There is no need to adhere in the direction, and the sealing function can be appropriately ensured while reducing the thickness of the valve body.

  In this gate valve, a circumferential groove is formed on the inner circumferential surface of the valve box so that the peripheral edge of the valve body in the closed position enters, and the sealing material is pushed from the pipe axis direction to the groove wall surface of the circumferential groove. What is compressed by hitting is preferable. According to such a configuration, the posture of the valve element disposed at the closed position is stabilized, and the sealing material can be compressed using the groove wall surface of the circumferential groove, so that the sealing function is appropriately performed without impairing the flow rate in the gate valve. Can be secured.

  In this gate valve, it is preferable that the inner peripheral surface of the valve box is provided with a protrusion that presses the valve body in the closed position in the tube axis direction and promotes compression of the sealing material. With such a configuration, by pressing the valve body in the closed position with the protrusion to promote the compression of the sealing material, a sealing state by the sealing material can be smoothly expressed and the sealing function can be improved satisfactorily.

  In the above, a notch having an inclined surface is formed at a position facing the protrusion of the valve body, and the protrusion that has entered the notch with the transition to the closed position of the valve body is inclined. What is comprised so that the said valve body may be pressed gradually in contact with a surface is preferable. According to such a configuration, when the valve body is moved to the closed position, it is possible to compress the seal material little by little while suppressing the drag of the seal material, thereby preventing the seal material from being damaged and increasing the torque, and exhibiting the sealing function better. Can do.

  In this gate valve, the sealing material has a lip portion that protrudes in the tube axis direction and extends along the peripheral edge portion of the valve body, and the lip portion is formed on the outer peripheral lip and the inner peripheral side of the outer lip. What consists of an inner lip formed through a concave groove and having a raised height smaller than the outer lip is preferable. In such a configuration, when the valve body is moved to the closed position, the outer lip enters the concave groove and falls and deforms toward the inner peripheral side, so that the compression action of the sealing material is enhanced. Further, since the inner lip supports the outer lip that has fallen and deformed, the sealing material can be prevented from being cut or peeled off.

  In this gate valve, the valve lid containing the valve shaft is provided separately from the valve box, and is configured such that the lower end of the valve lid can be inserted into a box-shaped part provided in the valve box, The gap between the box-shaped portion and the valve lid may be sealed with a sealing material fitted in a recess formed in the lower end portion of the valve lid. According to this configuration, it is possible to avoid the occurrence of a problem that the sealing material is removed when the valve lid is joined to the valve box.

  Further, the branch pipe connecting device according to the present invention is mounted so as to surround the above-described gate valve and the fluid pipe, and is divided into a plurality in the circumferential direction of the fluid pipe, and an end portion of the gate valve is used as a split surface. And a branch case connected by being sandwiched. This branch pipe connecting device is advantageous in that the perforation stroke can be shortened because the face-to-face dimension of the gate valve can be shortened based on the provision of the gate valve that can reduce the thickness of the valve body as described above. Nevertheless, it is not necessary to strongly press the valve body against the inner peripheral surface of the valve box to bring it into close contact in the radial direction, and the sealing function can be appropriately ensured while reducing the thickness of the valve body.

  In the branch pipe connecting device of the present invention, it is preferable that the valve body is disposed closer to the branch case with respect to the valve shaft. According to such a configuration, it is possible to avoid interference by moving the valve body in the closed position away from the cutter in the retracted position of the punching device connected to the gate valve in the tube axis direction, and to connect the valve shaft from the branch case to the pipe shaft. Since it can move away in the axial direction, it is possible to skillfully shorten the face-to-face dimension of the gate valve, thereby effectively shortening the drilling stroke.

The longitudinal cross-sectional view which shows an example of the branch pipe connection apparatus which concerns on this invention Cross-sectional view of the main part showing the valve body in the closed position Side view of gate valve and plan view of lock pin Front view of valve lid Longitudinal sectional view of gate valve showing joint part of valve box and valve lid Longitudinal sectional view showing a modification of the joint part between the valve box and the valve lid The figure which shows the state before compression of the sealing material of FIG. (A) Front view, (b) Rear view, and (c) Longitudinal sectional view of the valve body Sectional drawing which shows the state of (a) just before the completion of the transition to the closed position of the valve body and (b) the state of the completion of the transition Cross-sectional view of the main part showing the protrusion entering the notch Cross-sectional view of the main part showing the valve body when moving to the open position The figure which shows the state which connected the punching device to the gate valve Sectional drawing which shows the principal part which shows the gate valve which concerns on another embodiment of this invention. Front view of the valve body shown in FIG. The longitudinal cross-sectional view which shows the branch pipe connection apparatus currently disclosed by the said patent document 1

  Hereinafter, an embodiment of a branch pipe connection device according to the present invention will be described with reference to the drawings, taking as an example a case where a branch pipe is connected to an existing water pipe (an example of a fluid pipe). The branch pipe connection device shown in FIG. 1 is attached to a branch case 1 that is installed surrounding a water pipe K that is an existing pipe and is divided into a plurality of parts in the circumferential direction of the water pipe K, and a split surface 10 of the branch case 1. And a gate valve 2 connected with the end portion interposed therebetween.

  The gate valve 2 includes a valve box 21 constituting a part of a pipe line, a valve body 22 that is displaced between a closed position that blocks a flow path in the valve box 21 and an open position that opens the flow path, And a valve shaft 23 capable of operating the displacement of the valve body 22. The valve box 21 is formed of a tubular body that can communicate between both ends, and constitutes a part of a pipe line that is branched from the water pipe K. In the gate valve 2 of the present embodiment, a flange is formed at the branch pipe side end on the right side of FIG. 1, but the shape of the end is not particularly limited. For example, the receiving end to which the insertion end of the branch pipe can be connected. It may be a mouth shape.

  An insertion port 24 is formed through the valve box 21 so that the valve body 22 can enter and exit the valve box 21 through the insertion port 24. FIG. 1 shows a state in which the valve body 22 is raised and is in the open position. When the valve body 22 is lowered, the valve body 22 moves to the closed position shown in FIG. . The valve lid 25 is erected on the valve box 21 so as to cover the insertion port 24, incorporates the valve shaft 23 with the top 23 a protruding, and accommodates the valve body 22 in the open position.

  In this embodiment, the valve lid 25 is provided separately from the valve box 21, and as shown in FIG. 3, an example in which the valve box 21 and the valve lid 25 are joined using a set of lock pins 4. Show. FIG. 4 is a front view of the valve lid 25, and FIG. 5 is a vertical cross-sectional view of the gate valve 2 showing a joint portion between the valve box 21 and the valve lid 25. The cross section of FIGS. 1 and 2 corresponds to the AA arrow in FIG. 4, and the cross section of FIG. 5 corresponds to the BB arrow in FIG. A box-shaped portion 21 a having an upper opening is provided on the outer peripheral surface of the valve box 21, and a lower end portion of the valve lid 25 is inserted therein.

  The lock pin 4 is U-shaped with a pair of insertion shafts 4a, and is inserted into a hole formed at a joint portion between the valve box 21 and the valve lid 25 (on the opposite side not depicted in FIG. 3). The same). This hole is configured by a concave groove 21b formed in the inner wall of the box-shaped portion 21a and a concave groove 25a formed in the lower end portion of the valve lid 25 facing each other. In the state where the lock pin 4 is inserted, the valve lid 25 is engaged with the valve box 21 via the insertion shaft 4a, and the valve box 21 and the valve lid 25 are firmly joined.

  The sealing material 21c is fitted in a recess formed in the inner wall of the box-shaped portion 21a, and is compressed between the valve box 21 and the valve lid 25 to seal the gap therebetween. According to such a configuration, when the valve lid 25 is joined to the valve box 21, it is only necessary to insert the lower end portion of the valve lid 25 into the box-like portion 21a to which the sealing material 21c is attached, and then insert the lock pin 4. Compared with the structure in which the bolt and nut are fastened (see FIG. 15), the workability when the valve lid 25 is attached / detached can be remarkably improved.

  In the modification shown in FIG. 6, the sealing material 20 is fitted in a recess formed in the lower end portion of the valve lid 25. In the structure of FIG. 5, when the valve lid 25 is joined to the valve box 21, there is a concern that the sealing material 21 c is pushed by the valve lid 25 and comes out of the recess. Since the lower end portion of the valve lid 25 to which the sealing material 20 is attached is inserted into the box-shaped portion 21a, occurrence of such a problem can be avoided.

  The sealing material 20 attached to the lower end portion of the valve lid 25 has a shape as illustrated in FIG. 7 in a state before being compressed. The front end portions 20a of these sealing materials 20 are formed to bulge with a substantially circular cross section. When the valve lid 25 is joined to the valve box 21, the distal end 20a of the sealing material 20 is pressed against the inclined surface 21d provided on the inner wall of the box-shaped part 21a and is sufficiently compressed, so that the sealed state is accurate. It is configured to be obtained.

  The valve body 22 is formed by a plate-like body facing the valve shaft 23 from one side in the tube axis direction (left and right direction in FIG. 1) at the open position, and the details are as shown in FIG. With this structure, the thickness of the valve body 22 can be greatly reduced as compared with the valve body provided in the conventional soft seal gate valve, and the inter-surface dimension L of the gate valve 2 is shortened. When the flange is formed at the branch pipe side end as in this example, the inter-surface dimension L can be set to, for example, 230 mm or less regardless of the pipe diameter. In the present embodiment, the thickness T of the valve body 22 (the thickness of a body 22a described later) is smaller than the thickness (screw diameter) of the valve shaft 23, and the thickness t of the sealing material 3 is smaller than the thickness T of the valve body 22. .

  Moreover, the gate valve 2 has a thin-film-like sealing material 3 on the front surface on the branch pipe side, and a seal compressed between the valve body 22 and the valve box 21 in the closed position in the pipe axis direction. It is configured to be sealed with the material 3. Specifically, the peripheral edge portion of the valve body 22 in the closed position enters the peripheral groove 26 formed on the inner peripheral surface of the valve box 21, and the sealing material 3 is inserted into the groove wall surface 26 a of the peripheral groove 26 in the pipe axis direction. It is pressed and compressed. For this reason, it is not necessary to press the valve body 22 strongly against the inner peripheral surface of the valve box 21 to bring it into close contact in the radial direction, and the sealing function can be appropriately ensured while reducing the thickness of the valve body 22.

  In this gate valve 2, it is not necessary to closely contact the valve body 22 in the radial direction. Therefore, even if chips generated when the water pipe K is drilled are accumulated in the groove bottom of the circumferential groove 26, the sealing function is hindered thereby. It will not be done. In addition, in the valve box 21 of this embodiment, the hollow 36 is formed in the existing pipe side rather than the circumferential groove 26 so that chips may not adhere to the circumferential groove 26 and the valve body 22, so that the chips accumulate there. Measures are being taken. Chips around the depression 36 can be discharged to the outside through the drain 37.

  As shown in FIG. 8, the valve body 22 includes a disk-shaped body 22a, a head 22b protruding upward from the body 22a, and a thin-film sealing material 3 bonded to the front surface of the body 22a. The body 22a is formed of a highly rigid material suitable for water stop, for example, a metal such as steel, and the sealing material 3 is formed of an elastic material such as rubber. In this embodiment, since the sealing material 3 is provided on the branch pipe side of the body 22a, when the water pressure from the water pipe K acts on the gate valve 2 in the closed position, the sealing material 3 is compressed in the pipe axis direction. To improve the sealing performance.

  The sealing material 3 of the present embodiment is formed in a circular shape, but substantially contributes to sealing between the valve body 22 and the valve box 21 and extends in an annular shape along the peripheral edge of the valve body 22. Part. The sealing material 3 has a lip portion 30 that protrudes in the tube axis direction and extends along the peripheral edge portion of the valve body 22 at the annular portion. The lip portion 30 includes an outer lip 31 and an inner lip 32 that is formed on the inner peripheral side of the outer lip 31 via a recessed groove 33 and has a raised height smaller than that of the outer lip 31. The lip portion 30 faces the groove wall surface 26a and develops a compressing action as will be described later.

  A valve shaft 23 is connected to the head 22b of the valve body 22, and the valve body 22 in the open position faces the valve shaft 23 from the existing pipe side on the left side in FIG. The valve shaft 23 is a male screw member extending along the displacement direction of the valve body 22, and a female screw top 27 screwed into the valve shaft 23 is fitted into the head 22b with play in the tube axis direction. ing. When the valve shaft 23 is rotated through a jig (not shown) such as a handle attached to the top 23a, the female screw top 27 moves up and down, and the valve body 22 moves up and down in conjunction therewith.

  As described above, in the gate valve 2, the peripheral portion of the valve body 22 enters the circumferential groove 26, so that a sealed state by the sealing material 3 is obtained. At this time, when the groove width of the circumferential groove 26 is set to be appropriately larger than the thickness T of the valve body 22, the peripheral portion of the valve body 22 smoothly enters the circumferential groove 26 and shuts off the gate valve 2. The torque is reduced. However, on the other hand, since the sealing material 3 is difficult to be compressed in the tube axis direction, the gate valve 2 is provided with a protrusion 5 on the inner peripheral surface of the valve box 21 as shown in FIG.

  FIG. 9 is a view of the gate valve 2 viewed from the right direction in FIG. 2, and shows a cross section in which the valve box 21 and the valve body 22 are cut at the center of the circumferential groove 26. A plurality of projections 5 are provided on the groove wall surface 26b of the circumferential groove 26 at intervals in the circumferential direction. These protrusions 5 are arranged so that the rear surface of the peripheral edge of the valve element 22 is in the tube axis direction (in this embodiment, on the branch pipe side). And) to push the seal material 3 to be compressed. According to such a configuration, the sealing state by the sealing material 3 can be expressed smoothly, and the sealing function can be improved satisfactorily.

  Further, the valve body 22 is somewhat lowered until the transition to the closed position is completed after the peripheral edge of the valve body 22 starts to enter the circumferential groove 26. During this time, the sealing material 3 is applied to the groove wall surface 26a. When pressed, the sealing material 3 may be dragged and damaged, or the torque may increase. Therefore, in this gate valve 2, not only the protrusion 5 is provided on the inner peripheral surface of the valve box 21, but also a notch 6 having an inclined surface is formed at a location facing the protrusion 5 of the valve body 22. The protrusion 5 enters the notch 6 as the valve body 22 moves to the closed position.

  When the valve body 22 moves to the closed position, in the process from the state shown in FIG. 9A to the state shown in FIG. 9B, the protrusion 5 that has entered the notch 6 rubs against the inclined surface as shown in FIG. To touch. As described above, the protrusion 5 slides against the inclined surface of the notch 6 and gradually presses the valve body 22, so that the drag of the seal material 3 can be suppressed and the compression can be performed little by little. Increase can be prevented. In the present embodiment, in the state of FIG. 9B in which the transition to the closed position is completed, the protrusion 5 is positioned above the notch 6, and the protrusion 5 detached from the notch 6 stabilizes the valve body 22. Press.

  When the transition of the valve body 22 to the closed position is completed, the space between the valve body 22 and the valve box 21 is sealed by the sealing material 3. At this time, the lip portion 30 comes into contact with the groove wall surface 26a, and as shown in FIG. Is increased. Further, by supporting the outer lip 31 that has fallen and deformed by the inner lip 32, the sealing material 3 can be prevented from being cut or peeled off. Further, as shown in FIG. 11, when the lip portion 30 passes through the insertion port 24, the inner lip 32 can abut against the inner peripheral surface of the valve box 21 before the outer lip 31, so that the impact is reduced and the seal is made. Cutting of the material 3 can be prevented.

  On the other hand, when the inner lip 32 is not formed, the outer lip 31 that has fallen and deformed cannot be supported, so that the lip portion 30 is entirely pulled toward the inner peripheral side, and the sealing material 3 is peeled off from the body 22a. There is a concern. Moreover, when the lip | rip part 30 does not comprise the concave groove 33 but has raised in the shape of a mere mountain, there exists a possibility that the improvement of the compression effect | action mentioned above cannot be obtained and it may cut | disconnect from a root. The concave groove 33 is preferably a U-shaped groove as in the present embodiment, whereby the outer lip 31 tends to fall to the inner peripheral side.

  As shown in FIG. 8B, guide parts 7 projecting in the tube axis direction are formed on the back surface of the valve body 22 at three locations on the upper side and the left and right sides. The outer surface of the guide portion 7 is inclined along the displacement direction of the valve body 22, and an inclined surface 28 having an inclination that matches the outer surface of the guide portion 7 is formed at a contact portion of the valve box 21 with the guide portion 7. Is formed. Accordingly, when the valve body 22 is shifted to the closed position, the valve body 22 can be guided and properly positioned by contact between the guide portion 7 and the inclined surface 28.

  In the present embodiment, positioning protrusions 29 are formed on the outer peripheral surface of the gate valve 2, and these are used for connection with the branch case 1. The branch case 1 is composed of divided bodies 1A and 1B that can be water-tightly attached to the water pipe K, and has a split T-shaped pipe shape that is split into two vertically in FIG. On the split surface 10 of the branch case 1, the flanges of the split bodies 1 </ b> A and 1 </ b> B are fastened by a fastener 11 composed of a bolt and a nut. By tightening the fastener 11, the dividing surface 10 is watertightly closed via the packings 12 and 13, and the gate valve 2 is connected to the branch case 1.

  Since the split surface 10 of the branch case 1 is positioned in a substantially horizontal direction, even if a large load is generated due to ground fluctuation or secular change, the load is unlikely to act in the direction in which the bolt of the fastener 11 extends. It is possible to effectively prevent water leakage by suppressing the unexpected opening. The positioning protrusion 29 of the gate valve 2 is fitted into the recess of the extending portion 15 formed in the branch case 1, thereby positioning the gate valve 2 in the circumferential direction. As such a branch case, the structure disclosed in Japanese Patent Application Laid-Open No. 2009-127686 and Japanese Patent Application Laid-Open No. 2009-299826 by the present applicant can be applied in addition to the above-mentioned Patent Document 1.

  An example of a procedure for connecting a branch pipe to an existing water pipe K using this branch pipe connection device will be briefly described. First, as shown in FIG. 1, the branch case 1 is externally fitted to the water pipe K and attached, and the end portion of the gate valve 2 is sandwiched between the dividing surfaces 10 and watertightly connected. Next, as shown in FIG. 12, the punching device 8 is connected to the gate valve 2, and the peripheral wall of the water pipe K is punched by the cutter 80. When the drilling is completed, the cutter 80 is moved backward to move the valve body 22 to the closed position as shown in FIG.

  According to the present invention, since the face-to-face dimension of the gate valve 2 is suppressed, when the peripheral wall of the water pipe K is punched, the moving stroke of the cutter 80 can be short, and a small punching device can be used. If a flange is formed at the branch pipe side end as in this example, the pipe axial distance from the flange to the peripheral wall of the water pipe K is, for example, 240 mm or less, regardless of the pipe diameter of the gate valve 2. It is possible to set.

  In this embodiment, since the valve body 22 is disposed closer to the branch case with respect to the valve shaft 23, the valve body 22 in the closed position is moved away from the cutter 80 in the retracted position in the tube axis direction. Interference can be avoided, and the valve shaft 23 can be moved away from the branch case 1 in the tube axis direction. Therefore, the inter-surface dimension of the gate valve 2 can be skillfully shortened, and the drilling stroke can be shortened effectively. If the piercing device 8 is removed from the gate valve 2 and a branch pipe (not shown) is connected instead, and the valve body 22 is displaced to the open position, the water is divided from the water pipe K and the branch pipe is used. It will be ready.

[Another embodiment]
(1) In the above-described embodiment, the sealing material is provided on the front surface of the valve body on the branch pipe side, and the notch or the guide portion is provided on the back surface of the valve body on the existing pipe side. Then, as shown in FIG. 13, they may be arranged in reverse. In the valve body 22 shown in FIG. 13, in order to prevent the central guide portion 7 from interfering with the valve shaft 23, a vertical groove 72 is provided in the central guide portion 7 as shown in FIG. For the purpose of preventing rust, rubber lining may be applied to both surfaces of the valve body.

  (2) In the above-described embodiment, an example in which the valve body in the open position is opposed to the valve shaft from the existing pipe side, but conversely, the valve body may be arranged to be opposed from the branch pipe side. Absent. However, as described above, in order to reduce the face-to-face dimension of the gate valve, the positional relationship shown in the above-described embodiment is beneficial.

  (3) In the above-described embodiment, the example in which the peripheral portion of the valve body is inserted into the circumferential groove extending in the circumferential direction to compress the sealing material has been shown. However, in the present invention, for example, the peripheral edge of the valve body in the closed position A hook-like protrusion extending in the circumferential direction so as to face the portion may be formed on the inner peripheral surface of the valve box, and the seal material may be compressed in the tube axis direction using the hook-like protrusion. Moreover, if the peripheral part of the valve body is inserted between a pair of hook-shaped protrusions, the above-described protrusions, notches, and guide structures can be employed.

  (4) The fluid pipe is not limited to a water pipe, and may be a fluid pipe through which various liquids and gases flow.

DESCRIPTION OF SYMBOLS 1 Branch case 2 Gate valve 3 Seal material 5 Protrusion 6 Notch 7 Guide part 8 Punching device 10 Dividing surface 21 Valve box
21a Box-shaped part
21ax Central part of box-shaped part
21ay Side part 22 of box-like part Valve body 23 Valve shaft 25 Valve cover 26 Circumferential groove 26a Groove wall surface 30 Lip part 31 Outer lip 32 Inner lip 33 Concave groove K Water pipe (an example of fluid pipe)

Claims (4)

A valve box that constitutes a part of the pipe line after construction, a valve body that is displaced between a closed position that blocks a flow path in the valve box and an open position that opens the flow path, and A valve shaft capable of operating displacement, and the valve body is formed by a plate-like body facing the valve shaft from one side in the tube axis direction at the open position, and the valve body at the closed position A gate valve configured to be sealed with a sealing material compressed in the tube axis direction between the valve box and the valve box;
And a branch case that is mounted so as to surround the fluid pipe and is divided into a plurality in the circumferential direction of the fluid pipe, and is connected by sandwiching an end portion of the gate valve between the split surfaces,
The valve box has one end sandwiched between the split surfaces of the branch case and the other end to which the branch pipe is connected, and is formed by a tubular body that can communicate between the both ends.
A valve lid containing the valve shaft is provided separately from the valve box, and an insertion port is formed through the valve box, and the valve body enters and exits the valve box through the insertion port. The valve lid is erected on the valve box so as to cover the insertion port ,
The valve body includes a metal disk-shaped body, a head protruding upward from the body and connected to the valve shaft, and the thin-film sealing material bonded to the body, A branch pipe connection device in which the thickness of the body is smaller than the thickness of the valve shaft, the thickness of the sealing material is smaller than the thickness of the body, and the sealing material is provided on the branch pipe side of the body .   The branch pipe connection device according to claim 1, wherein the valve body is disposed closer to the branch case with respect to the valve shaft.   A positioning protrusion is formed on the outer peripheral surface of the gate valve, and the positioning valve is configured to be positioned in the circumferential direction by being fitted into a recess of an extending portion formed in the branch case. The branch pipe connecting device according to claim 1 or 2. A seal that is configured such that a lower end portion of the valve lid can be inserted into a box-like portion provided in the valve box, and a gap between the box-like portion and the valve lid is attached to the lower end portion of the valve lid. The valve lid is engaged with the valve box via the insertion shaft in a state where the insertion shaft is inserted into a hole formed in a joint portion between the valve box and the valve lid. ,
The hole into which the said insertion shaft is inserted is formed in the side part of the said box-shaped part where thickness is smaller than the center part of the said box-shaped part by which the said valve shaft is arrange | positioned. The branch pipe connecting device according to item.

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