JP5103148B2 - Branch pipe connection method and branch pipe connection device - Google Patents

Description

  The present invention relates to a branch pipe connecting method and a branch pipe connecting device for connecting a branch pipe to an existing pipe.

  In recent years, in branch pipe connection work where branch pipes are installed in the middle of existing fluid pipes such as water pipes, the peripheral walls of existing pipes are perforated while maintaining the state of uninterrupted water without stopping water on the upstream side. However, a method of connecting branch pipes is adopted. In such a construction method, as disclosed in Patent Document 1 below, a branch case made of a split body that can be watertightly attached to an existing pipe, an end on one side is connected to the branch case, and an end on the other side is connected to the branch pipe. A branch pipe connecting device provided with a gate valve connectable to is used.

  18 and 19 are front views for explaining an example of a conventional branch pipe connection method. In this construction method, first, as shown in FIG. 18, the right and left split case 51 is fitted on the existing pipe K, and the divided surfaces are flange-connected and mounted in a watertight state. Then, the flange portion 51a of the branch case 51 and the flange portion 52a of the gate valve 52 are fastened with bolts and nuts, and the branch case 51 and the gate valve 52 are connected with the top portion 52c of the gate valve 52 facing upward. .

  Next, the flange 52 b of the gate valve 52 and the flange 53 a of the punching device 53 are fastened with bolts and nuts, and the punching device 53 is connected to the gate valve 52. Although not shown, inside the drilling device 53, there is a rotating shaft configured to be rotatable by a drive unit, a cylindrical hole saw provided at the tip of the rotating shaft, and a drill protruding forward from the center position of the hole saw. And built-in. The hole saw is configured to move forward and backward together with a drill by a feed handle 54 provided at the rear of the punching device 53.

  After connecting the perforating device 53 to the gate valve 52, the valve body of the gate valve 52 is retracted upward to open the gate valve 52 in a communicating state. Subsequently, while rotating the hole saw, the feed handle 54 is rotated and fed to the existing pipe K side, and the peripheral wall of the existing pipe K is perforated. When the drilling is completed, the rotation of the hole saw is stopped, and the feed handle 54 is reversely rotated to retract the hole saw. A part of the peripheral wall of the cut-out existing pipe is collected by being caught by a drill.

  After sufficiently retracting the hole saw, the valve body of the gate valve 52 that has been retracted upward is lowered to close the communication state. Then, as shown in FIG. 19, the punching device 53 is removed, and a branch pipe 55 is connected instead. In this example, the flange portion 52b of the gate valve 52 and the flange portion 56a of the connection pipe 56 are fastened with bolts and nuts, and the tip of the branch pipe 55 is inserted into a receiving port provided in the connection pipe 56, whereby the gate valve 52 and the branch pipe 55 are connected. According to such a branch pipe connection method, since the branch pipe is provided without water shutoff, convenience for the user is high.

  However, in the prior art as described above, since the connection points such as the split surface of the branch case connected to the flange and the flange portion of each member are located in a direction perpendicular to the axial center direction of the branch pipe, When a large load is applied to a branch pipe or an existing pipe due to aging, etc., there is a problem that the connection portion is easily opened due to the extension of the bolt and the fluid inside the pipe leaks. Normally, piping is buried in the soil, and even if fluid leaks out, it is difficult to detect and countermeasures tend to be delayed, so there are many losses associated with fluid outflow.

  In order to solve this problem, a method may be employed in which the entire connection portion is covered with concrete and hardened. However, it is not always sufficient as a countermeasure such as cracking in concrete or fluid leaking from concrete. In addition, there is a problem that inspection and maintenance work cannot be performed on the connection points.

In recent years, the depth of pipe burial tends to be shallow, and the demand for a branch pipe connection method and a branch pipe connection apparatus that can appropriately cope with this has increased. If the above prior art is applied as it is to an existing pipe buried in a shallow layer, the amount of earth covering from the top of the gate valve to the ground cannot be obtained appropriately, but such a situation must be avoided. For these reasons, there is a demand for a branch pipe connection method and a branch pipe connection device that can appropriately cope with existing pipes buried in a shallow layer while solving the above-described problems related to fluid leakage at the connection points.
JP 2002-154004 A

  The present invention has been made in view of the above circumstances, and its purpose is to prevent leakage of fluid from the connection location even when a large load is applied to the connection location between the existing pipe and the branch pipe. An object of the present invention is to provide a branch pipe connection method capable of appropriately dealing with an existing pipe buried in a layer, and a branch pipe connection device used therefor.

The above object can be achieved by the present invention as described below. That is, in the branch pipe connection method according to the present invention, a gate valve that can be connected to a branch pipe is attached to a predetermined location of the existing pipe, and a branch case made of a divided body having a flange portion is externally fitted to the existing pipe. In the first step of mounting, and in a state where the partition valve is tilted around the axis so that the split surface of the branch case is positioned substantially in the horizontal direction and the top of the gate valve does not face upward , A second step of tightening the divided bodies using a fastener for fastening the flange portions together to firmly connect the branch case and the gate valve; and connecting a punching device to the gate valve to connect the existing pipe A third step of connecting the branch pipe to the gate valve after removing the punching device after the drilling by the punching device is completed, and when connecting the branch case and the gate valve The branch A protrusion provided on the outer peripheral surface in the vicinity of the existing pipe-side end of the gate valve is fitted into a recess formed in the end of the gate on the side of the gate valve, and the outer side is inclined to the expanded diameter of the recess. And a second inclined surface formed on the projection and inclined in a direction descending toward the existing pipe side end of the gate valve, are brought into surface contact with each other.

  According to the branch pipe connection method of the present invention, the split surface of the branch case connected to the flange is positioned in a substantially horizontal direction, and the connection between the branch case and the gate valve fastens the flange portions of the split body of the branch case. Because it is done by tightening the fastener, even if a heavy load due to ground fluctuation or secular change is applied, the connection location is not located in the opening direction, and it is difficult for the load to act on the fastener. It is possible to reliably and effectively prevent the fluid from leaking from the connection portion. In the present invention, when connecting the branch case and the gate valve, the protrusion provided on the gate valve is fitted into the recess formed in the branch case, and the first inclined surface of the recess and the second inclined surface of the protrusion are connected. Since they are brought into surface contact with each other, the branch case and the gate valve are firmly connected, and the relative rotation of the two is prevented and the construction work can be easily performed. Moreover, since the gate valve is connected in a tilted state, the height position of the top of the gate valve is lowered, and an existing pipe buried in a shallow layer can be appropriately handled. The positional relationship between the recess and the protrusion is set so that the gate valve can be connected to the branch case in a tilted state. As described above, according to the present invention, it is possible to appropriately cope with the existing pipe buried in the shallow layer while preventing leakage of the fluid from the connection portion as described above.

  In the above, the first step is to attach the gate valve to a predetermined location on the upper surface of the existing pipe, and the branch case and the gate valve are rotated integrally after the first step. Thus, it is preferable that the dividing surface of the branch case is positioned in a substantially horizontal direction and the gate valve is tilted and the process proceeds to the second step.

  According to the above method, the gate valve and the branch case are mounted on the upper surface of the existing pipe, and by rotating them, the existing pipe can be drilled and the branch pipe can be connected subsequently. Therefore, when excavating a pit, it is only necessary to secure a space in the depth direction, and the space around the connection point necessary for installing the branch pipe connection device is reduced. Branch pipe connection work becomes possible. In addition, the time required for construction work such as pit formation work is shortened and work efficiency is increased.

  In the above, in the first step, the pair of protrusions provided at positions shifted in angle with respect to the moving direction of the valve element built in the gate valve are arranged in the vertical direction in the second step. It is preferable to fit in a pair of said recessed part. In the present invention, since the split surface of the branch case is positioned substantially in the horizontal direction, the flange portions of the split body are fastened in the vertical direction, and therefore, by fitting the pair of protrusions into the concave portions arranged in the vertical direction, The connection strength between the branch case and the gate valve can be suitably secured. And since the pair of protrusions are provided at positions shifted in angle with respect to the moving direction of the valve body, it can be connected to the branch case in a state where the gate valve is tilted.

  In the above, it is preferable that the pair of protrusions are provided in a direction substantially orthogonal to the moving direction of the valve body. Thereby, since a gate valve inclines the top part toward a substantially horizontal direction, even when the embedding depth is quite shallow, it can respond reliably.

  In the above, the existing pipe side end face of the gate valve has a lining layer made of a material softer than the constituent material of the valve box of the gate valve and has a concave shape along the outer peripheral surface of the existing pipe. In the first step, it is preferable that the gate valve is attached to a predetermined position on the upper surface of the existing pipe via the lining layer. According to this configuration, the clearance adjustment is facilitated by absorbing the tolerance of the pipe diameter of the existing pipe, and the mountability to the existing pipe is improved. Further, when the gate valve is mounted on the upper surface of the existing pipe, the mounting stability is remarkably improved, which is particularly useful.

  In the above, it is preferable that in the third step, the chips generated in the drilling operation are discharged from a discharge part provided in the branch case together with the fluid flowing into the branch case from the existing pipe. . When the gate valve is connected with the top facing upward as in the prior art, even if chips remain inside the gate valve, the surface pressure is increased by the valve body descending in the vertical direction, and the gate valve is Although the valve can be closed properly, if the gate valve is tilted, the surface pressure of the valve body may drop somewhat, and if the chips remain inside the gate valve, the closing performance may deteriorate. Concerned. Therefore, in the above configuration of the present invention, the chips are discharged from the discharge portion provided in the branch case, so that the chips are prevented from staying inside the gate valve and the closing performance by the gate valve is ensured. .

  In the above, in the second step, the fastener is tightened to increase a contact area between the first inclined surface and the second inclined surface, and the first inclined surface presses the second inclined surface. And the inner rib wall of the concave groove formed to act in the direction away from the branch case from the branch case and to fit the sealing material into the inner peripheral surface of the branch case near the gate valve side end. It is preferable that the extension valve formed on the existing pipe side end face of the gate valve is contacted to stop the gate valve from moving away from the branch case. Thereby, since the wedge effect is produced in the connection between the branch case and the gate valve, the connection strength can be effectively increased.

Further, the branch pipe connection device according to the present invention comprises a split body having a flange portion, a branch case that can be watertightly attached to an existing pipe, and a gate valve that is connected to the branch case and can be connected to the branch pipe. A branch pipe connecting device that enables the branch pipe to be connected to the existing pipe, wherein a first inclined surface that is formed at the gate valve side end portion of the branch case and that is inclined outwardly and opens outward is formed. And a protrusion having a second inclined surface that is provided on an outer peripheral surface in the vicinity of the existing pipe side end of the gate valve and that is inclined in a direction downward toward the existing pipe side end of the gate valve , When connecting the branch case and the gate valve, the projection is fitted into the recess, and the first inclined surface and the second inclined surface are in surface contact with each other, and the split surface of the branch case Then, the franc of the divided body With parts to each other are fastened by a fastener, the connection between the branch casing by engagement of said fastener and said gate valve is made via a sealing material, of the gate valve with the divided surface is positioned substantially horizontally The branch pipe is configured to be connectable to the existing pipe in a state where the gate valve is tilted around the axis so that the top does not face upward .

  In the branch pipe connection device according to the present invention, the split surface of the branch case connected to the flange is positioned substantially in the horizontal direction, and the connection between the branch case and the gate valve fastens the flange portions of the split body of the branch case. This is done by tightening the tool. Therefore, even if a heavy load due to ground fluctuation or secular change is applied, the connection location is not located in the opening direction and the load is difficult to act on the fastener, so the fluid inside the piping leaks from the connection location. Can be reliably and effectively prevented. Further, in the present invention, when connecting the branch case and the gate valve, the protrusion provided on the gate valve is fitted into the recess formed in the branch case, and the first inclined surface of the recess and the second inclined surface of the protrusion are connected. Since they are brought into surface contact with each other, the branch case and the gate valve are firmly connected, and the relative rotation of the two is prevented and the construction work can be easily performed. Moreover, in the present invention, since the branch pipe can be connected to the existing pipe in a state where the gate valve is tilted, the height position of the top portion of the gate valve is lowered, and it is possible to appropriately cope with the existing pipe buried in the shallow layer. . The positional relationship between the recess and the protrusion is set so that the gate valve can be connected to the branch case in a tilted state. As described above, according to the present invention, it is possible to appropriately cope with the existing pipe buried in the shallow layer while preventing leakage of the fluid from the connection portion as described above.

  In the above, a pair of said protrusion provided in the position which shifted the angle with respect to the moving direction of the valve body which the said gate valve incorporates is comprised so that it can engage | insert in a pair of said recessed part arrange | positioned at an up-down direction. Those are preferred. In the present invention, since the split surface of the branch case is positioned substantially in the horizontal direction, the flange portions of the split body are fastened in the vertical direction, and therefore, by fitting the pair of protrusions into the concave portions arranged in the vertical direction, The connection strength between the branch case and the gate valve can be suitably secured. And since the pair of protrusions are provided at positions shifted in angle with respect to the moving direction of the valve body, it can be connected to the branch case in a posture in which the gate valve tilts.

  In the above, it is preferable that the pair of protrusions are provided in a direction substantially orthogonal to the moving direction of the valve body. Thereby, since the gate valve can be tilted along the axial direction of the existing pipe, it is possible to reliably cope with a case where the embedding depth is considerably shallow.

  In the above, the existing pipe side end surface of the gate valve has a lining layer made of a material softer than the constituent material of the valve box of the gate valve, and has a concave shape along the outer peripheral surface of the existing pipe. preferable. According to this configuration, the clearance adjustment is facilitated by absorbing the tolerance of the pipe diameter of the existing pipe, and the mountability to the existing pipe is improved. Further, when the gate valve is mounted on the upper surface of the existing pipe, the mounting stability is remarkably improved, which is particularly useful.

  In the above, it is preferable that the branch case is provided with a discharge part capable of discharging the fluid flowing into the branch case from the existing pipe. As described above, when the gate valve is tilted, there is a concern that the closing performance is reduced due to the retention of chips inside the gate valve. It is possible to prevent the stagnation of chips at the gate and to secure the closing performance by the gate valve.

  In the above, as the fastener is tightened, a contact area between the first inclined surface and the second inclined surface is increased, and the first inclined surface presses the second inclined surface, so that from the branch case A concave groove is formed in the inner peripheral surface of the branch case in the vicinity of the gate valve side end portion of the branch case, and the concave groove is formed in the inner peripheral surface of the branch case near the gate valve side end. It is preferable that the inner ridge wall that contacts the projecting portion formed on the existing pipe side end face of the gate valve and stop the gate valve from moving away from the branch case. . According to this configuration, in addition to the first inclined surface and the second inclined surface being in surface contact, the wedge effect is generated, so that the connection strength between the branch case and the gate valve can be effectively increased. .

  Hereinafter, embodiments of the branch pipe connection method and the branch pipe connection device according to the present invention will be described with reference to the drawings, taking as an example the case of connecting a branch pipe to an existing water pipe.

  FIG. 1 is a front view showing an example of a gate valve provided in a branch pipe connection device according to the present invention, and FIG. 2 is a cross-sectional view taken along the line AA. The gate valve 2 has an end portion (existing pipe side end portion) directed toward the left side in FIG. 1 connected to a branch case 1 described later, and an end portion on the opposite side is a receiving portion 2b whose diameter is increased. In addition, a passage that can communicate between both ends is formed. The gate valve 2 has a built-in valve body (not shown) that allows a passage (not shown) to enter and exit the passage by rotating a jig (not shown) attached to the top 2c. An arrow M indicates the moving direction of the valve body.

  A pair of protrusions 2d and 2e are provided on the outer peripheral surface in the vicinity of the existing pipe side end of the gate valve 2 on the top, bottom, left and right in FIG. The protrusions 2d and 2e are inclined in a direction downward toward the projecting portion 2a, and reference numeral 2e1 is an inclined surface of the protrusion 2e (corresponding to the second inclined surface). The pair of protrusions 2d are provided along the movement direction M of the valve body, whereas the pair of protrusions 2e are located at positions shifted in angle with respect to the movement direction M of the valve body. It is provided in a direction substantially orthogonal to the body movement direction M.

  Further, an overhanging portion 2a is formed in the circumferential direction on the existing pipe side end surface of the gate valve 2, and a lining layer 2f made of a softer material than the constituent material of the valve box of the gate valve 2 is provided. As a whole, it has a concave shape along the outer peripheral surface of the existing pipe K, which will be described later. The material of the lining layer 2f is exemplified by rubber, but may be resin or the like. The lining layer 2f is not limited to the one adhered to the existing pipe side end face, and can also be formed by covering the overhang portion 2a with a rubber body 2g as shown in FIG.

  Hereinafter, a method of connecting a branch pipe to the existing pipe K by the branch pipe connecting method according to the present invention will be described. First, as shown in FIGS. 4 and 5, the gate valve 2 is mounted at a predetermined position on the upper surface of the existing pipe K. FIG. 5 is a partial cross-sectional view of FIG. 4 as viewed from the left. In the present embodiment, the gate valve 2 is mounted in a posture in which the top 2c is oriented parallel to the axial direction of the existing pipe K. Since the gate valve 2 changes its circumferential position with respect to the existing pipe K in a subsequent process, this state is temporarily placed. Usually, since the existing pipe K is buried in the soil, the peripheral part of the location where the branch pipe is connected is excavated to form a pit.

  In this embodiment, since the existing pipe side end surface of the gate valve 2 forms a concave shape along the outer peripheral surface of the existing pipe K, temporary placement of the existing pipe K at a predetermined position on the upper surface is stable, and workability can be improved. . The end face on the existing pipe side is preferably formed in a concave shape having substantially the same curvature as the outer peripheral face of the existing pipe K, but it is uneconomical to prepare the gate valves 2 corresponding to the pipe diameter of the existing pipe K. is there. Therefore, by mounting the gate valve 2 on the upper surface of the existing pipe K via the lining layer 2f as in the present embodiment, the mounting operation of the gate valve 2 can be stabilized regardless of the pipe diameter of the existing pipe K. Can be done.

  After the gate valve 2 is mounted, as shown in FIGS. 6 and 7, the branch case 1 is externally fitted and mounted from below the existing pipe K so as to hold the existing pipe K (the first step). Equivalent to.) FIG. 7 is a partial cross-sectional view of FIG. 6 viewed from the left. The branch case 1 has a split T-tube shape, and is composed of split bodies 1A and 1B that are split into left and right parts in FIG. The branch case 1 and the gate valve 2 are not flange-connected, and the gate end of the branch case 1 is externally fitted to the existing pipe side end of the gate valve 2.

  FIG. 8 is an enlarged view of the main part of FIG. 7 and shows one side of the branch valve side end of the branch case 1. A recess 1b (see FIG. 6) having an inclined surface 1b1 (corresponding to the first inclined surface) that is inclined in an enlarged diameter and opens outward is provided at the end of the branch case 1 on the gate valve side. . In this embodiment, the recessed part 1b is formed in each of the division bodies 1A and 1B on the left and right of FIG. 7, and the protrusion 2e is fitted in this pair of recessed parts 1b. The inclined surface 2e1 of the protrusion 2e and the inclined surface 1b1 of the recess 1b are provided so as to be slidable in surface contact with each other, but it is not necessary to be in surface contact at this stage. The fastening part of the branch case 1 is designed so as to avoid interference with the protrusion 2d.

  Thus, since the protrusion 2e is fitted in the recess 1b, the relative rotation between the branch case 1 and the gate valve 2 can be prevented, and the construction work can be easily performed. The flange portions of the split bodies 1A and 1B of the branch case 1 are fastened by a fastener 3 including a bolt 3a and a nut 3b. At this stage, the bolt 3a and the nut 3b are temporarily fixed without being sufficiently tightened. deep. As will be described later, when the fastener 3 is further tightened, it is connected in a watertight manner by a sealing material 4 built in the split end portion and a sealing material 5 fitted on the outer peripheral surface of the gate valve 2 to branch off. Case 1 and gate valve 2 are firmly connected.

  Next, as shown in FIG. 9, the branch case 1 and the gate valve 2 are integrally rotated about 90 ° in the clockwise direction in FIG. And the gate valve 2 is tilted. At this time, it is preferable to place the block 6 so that the leg 1a of the branch case 1 and the protruding portion of the receiving portion 2b of the gate valve 2 are substantially in the same horizontal plane. In addition, the description of the leg 1a and the board 6 is omitted except for FIG.

  Due to this rotation, the split direction of the branch case 1, which was left and right in FIG. 7, becomes up and down, the split surface of the branch case 1 is positioned in a substantially horizontal direction, and the axial center direction of the branch pipe connected to the gate valve 2 It becomes almost parallel. For this reason, even if the branch case 1 and the gate valve 2 are not flange-connected, after connecting the branch pipe to the existing pipe K, even if a large load suddenly or gradually acts on those connection locations. Since the connection location is not located in the opening direction and the load is unlikely to act on the fastener such as the bolt 3a, it is possible to reliably and effectively prevent the fluid inside the pipe from leaking from the connection location.

  The state in which the gate valve 2 is tilted is a state in which the gate valve 2 is tilted and tilted around the axis so that the top portion 2c does not face upward. Thereby, since the height position of the top part 2c of the gate valve 2 is lowered, even if the existing pipe K is buried in a shallow layer, the amount of earth covering from the top part 2c to the ground can be appropriately obtained. In the present embodiment, the pair of protrusions 2e provided in a direction substantially orthogonal to the moving direction M of the valve body is fitted into the pair of recesses 1b arranged in the vertical direction as shown in FIG. Tilts the top 2c toward the substantially horizontal direction. Therefore, even when the embedding depth is considerably shallow, it is possible to reliably cope with it.

  The gate valve 2 is connected to the branch pipe as described later in the posture as shown in FIG. 9 rotated together with the branch case 1. In other words, the branch pipe connecting device of the present invention is configured such that the branch pipe can be connected to the existing pipe K in a state where the dividing surface of the branch case 1 is positioned in a substantially horizontal direction and the gate valve 2 is tilted. 4 to 7, the posture of the gate valve 2 is adjusted and mounted so that the gate valve 2 is tilted by the 90 ° rotation described above, and the movement direction M of the valve body In view of the fact that the pair of recesses 1b are arranged in a direction substantially orthogonal to each other, a protrusion 2e is provided at that location. In the present invention, the protrusions 2d are not necessarily provided, but these can be used when the gate valve 2 is not tilted.

  Further, in the present invention, when excavating the periphery of the existing pipe K to form a pit, the pit is formed somewhat deeper, the branch case 1 is attached to the existing pipe K and rotated as described above, Branch pipe connection work becomes possible. For this reason, it can be applied even in a place where a large surrounding space cannot be secured, for example, there is an existing building in the vicinity, and it is possible to shorten the time required for the pit formation work and increase the work efficiency. .

  Subsequently, when the fastener 3 is further tightened to increase the connection strength between the branch case 1 and the gate valve 2, the inclined surface 1b1 of the concave portion 1b of the branch case 1 is formed at two locations, as shown in FIGS. The surface contact with the inclined surface 2e1 of the protrusion 2e of the gate valve 2 occurs. The sealing material 5 has a closed circular shape, and is fitted in a recessed groove formed on the inner peripheral surface of the branch case 1 near the gate valve end. When the fastener 3 is further tightened, as shown in FIGS. 12 and 13, the contact area between the inclined surface 1b1 and the inclined surface 2e1 is increased at two locations on the upper and lower sides, whereby the inclined surface 1b1 presses the inclined surface 2e1. , Acting in a direction to keep the gate valve 2 away from the branch case 1.

  Then, as shown in FIGS. 14 and 15, the fastener 3 is further tightened to firmly connect the branch case 1 and the gate valve 2 (corresponding to the second step). At this time, the inclined surface 1b1 and the inclined surface 2e1 are brought into surface contact so as to maximize the contact area, and the inclined surface 1b1 of the branch case 1 presses the inclined surface 2e1 of the protrusion 2e. The gate valve 2 is moved away from the branch case 1 by contacting the inner projecting wall 1c of the concave groove into which the sealing material 5 is fitted and the overhanging portion 2a of the gate valve 2 in contact with each other. And the fastening by the fastener 3 is completed. According to such a configuration, even if a large load is applied after connecting the branch pipe, the connection between the branch case 1 and the gate valve 2 is strong, so that it is possible to effectively prevent the fluid from leaking.

  When there are other fastening locations of the branch case 1, they are fastened using bolts and nuts that are fasteners, and the water tightness of the branch case 1 attached to the existing pipe K is ensured. After the branch case 1 and the gate valve 2 are firmly connected, as shown in FIG. 16, the punching device 12 is connected to the receiving port 2b of the gate valve 2, and the valve body of the gate valve 2 is retracted upward. After opening the inside of the gate valve 2 in a communicating state, the peripheral wall at a predetermined location of the existing pipe K is drilled by the punching device 12. Then, after the drilling is completed, the rotation of the hole saw built in the drilling device 12 is stopped, the drilling device 12 is removed, and instead, the tip of the branch pipe is inserted into the receiving port 2b to complete the connection, and the branching is performed. The tube is in a usable state (corresponding to the third step).

  When performing the above drilling operation, the chips generated in the drilling operation can be discharged from the discharge unit 13 provided in the branch case 1 together with the fluid flowing into the branch case 1 from the existing pipe K. preferable. In FIG. 16, the example which attached the discharge hose 15 which has the ball valve 14 to the discharge part 13 is shown. According to such a configuration, it is possible to prevent chips from staying inside the gate valve 2, so that the closing performance can be suitably ensured even in the present embodiment in which the moving direction M of the valve body is substantially horizontal, The valve body does not come into contact with chips and is damaged. Thus, the structure which provides the discharge part 13 in the branch case 1 is especially useful when tilting the gate valve 2 in a substantially horizontal direction like this embodiment.

[Another embodiment]
(1) In the above-described embodiment, when the branch case 1 and the gate valve 2 are firmly connected, the fastener 3 is tightened, and the inclined surface 1b1 of the concave portion 1b of the branch case 1 and the slope 2e of the gate valve are inclined. Although an example in which the contact area with the surface 2e1 is increased and the inclined surface 1b1 presses the inclined surface 2e1 to cause the gate valve 2 to move away from the branch case 1 is shown. In order to increase the connection strength with the bolt 2, bolts 10 may be interposed as shown in FIGS.

  That is, as shown in FIGS. 17A to 17C, a bolt hole in which a female screw is formed is formed at a position between the recessed groove into which the sealing material 5 is inserted and the inclined surface 1b1. By screwing the bolts 10 into the connection, the connection between the branch case 1 and the gate valve 2 is further strengthened. In this case, as the fastener 3 is tightened, the inclined surface 1b1 presses the inclined surface 2e1 and the inner rib wall 1c of the branch case 1 and the gate valve 2 as shown in FIGS. After the contact with the overhanging portion 2a stops, the bolt 10 may be screwed and screwed as shown in FIG.

  The screw 10 may be screwed at one place or a plurality of places. Moreover, you may connect the volt | bolt 10 so that it may act in the direction which keeps the gate valve 2 away from the branch case 1 by pressing the inclined surface 2e1 of the protrusion 2e directly. However, when such a bolt 10 is interposed, it is not always necessary to adopt a configuration in which the inclined surface 1b1 presses the inclined surface 2e1 and acts so as to move the gate valve 2 away from the branch case 1. The branch case 1 and the gate valve 2 may be connected by tightening the fastener 3 and screwing the bolt 10.

  (2) In the above-described embodiment, tap water is taken as an example of the fluid inside the pipe. However, the present invention is not limited to this, and can be applied to fluids such as various liquids and gases.

  (3) In the above-described embodiment, an example in which two pairs of protrusions 2d and 2e are provided on the outer peripheral surface of the gate valve 2 is shown. However, the present invention can be connected to a branch pipe in a state where the gate valve is tilted. If there is, it is not limited to this. For example, in the above-described embodiment, a pair of protrusions 2d may not be provided, or a protrusion may be provided between the protrusions 2d and 2e. Although one projection 2e may be provided, the split surface of the branch case 1 is positioned in a substantially horizontal direction, and the flange portions of the split bodies 1A and 1B are fastened in the vertical direction. From the viewpoint of securing the connection strength between the branch case 1 and the gate valve 2, it is preferable that a pair of protrusions 2e that can be fitted in the concave portion 1b arranged in the vertical direction is provided.

  (4) In the above-described embodiment, the example in which the gate valve 2 is tilted in the substantially horizontal direction has been described. However, the present invention is not limited to this as long as the gate valve 2 is tilted so as to be embedded in the soil. However, for example, the gate valve 2 may be connected to the branch pipe in a state where the gate valve 2 is inclined 45 ° from the vertical direction.

  (5) In the above-described embodiment, the example in which the gate valve 2 is mounted on the upper surface of the existing pipe via the lining layer 2f is shown. However, in the present invention, the existing pipe is not provided with the lining layer 2f. Alternatively, the gate valve 2 may be placed directly on the upper surface. Even in this case, it is preferable that the existing pipe side end face of the gate valve 2 is formed in a concave shape to improve the mounting stability with respect to the existing pipe K.

  (6) In the above-described embodiment, by rotating the gate valve 2 and the branch case 1 attached to the existing pipe K, the split surface of the branch case 1 is positioned in a substantially horizontal direction, and the gate valve 2 is tilted. However, the present invention is not limited to this. For example, when attaching the branch case 1 to the existing pipe K, the dividing surface may be positioned in the substantially horizontal direction from the beginning. In this case, after the divided body 1B is mounted below the existing pipe K, it is mounted on the existing pipe K while the gate valve 2 is tilted, and then the divided body 1A is mounted above the existing pipe K. The state shown in 9 is obtained.

The front view which shows an example of the gate valve with which the branch pipe connection apparatus which concerns on this invention is equipped AA arrow sectional view of FIG. The figure which shows the modification concerning arrangement | positioning of a lining layer Front view showing a state where a gate valve is mounted on an existing pipe Partial sectional view of FIG. 4 viewed from the left Front view showing a state where a branch case is attached to an existing pipe Partial sectional view of FIG. 6 viewed from the left 7 is an enlarged view of the main part of FIG. Partial sectional view showing the state where the branch case is rotated Partial sectional view showing a state in which the fastener is tightened BB arrow view of FIG. The fragmentary sectional view which shows the state which tightened the fastener further from the state of FIG. CC arrow view of FIG. Partial sectional view showing a state in which tightening by a fastener is completed DD arrow view of FIG. Plan view showing the state of drilling the peripheral wall of an existing pipe The figure explaining the modification of the connection structure of a branch case and a gate valve Front view explaining an example of a conventional branch pipe connection method Front view explaining an example of a conventional branch pipe connection method

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Branch case 1A, 1B Divided body 1b Recessed part 1b1 1st inclined surface 1c Inner rib wall 2 Gate valve 2a Overhang | projection part 2e Protrusion 2e1 2nd inclined surface 3 Fastener 5 Seal material 12 Punching device 13 Discharge part K Existing pipe

Claims (13)

A first step of attaching a gate valve connectable to the branch pipe to a predetermined location of the existing pipe, and fitting and attaching a branch case made of a split body having a flange portion to the existing pipe;
Fasteners that fasten the flange portions of the divided body in a state in which the partition valve is tilted around the axis so that the split surface of the branch case is positioned in a substantially horizontal direction and the top of the gate valve does not face upward. The second step of tightening the divided bodies using a to firmly connect the branch case and the gate valve;
A third step of connecting a perforating device to the gate valve to perforate a peripheral wall of the existing pipe, removing the perforating device after completion of perforation by the perforating device, and connecting the branch pipe to the gate valve; ,
When connecting the branch case and the gate valve, a protrusion provided on the outer peripheral surface in the vicinity of the existing pipe side end of the gate valve is fitted into a recess formed in the gate side end of the branch case. And a first inclined surface that inclines into the diameter-expanded shape of the recess and opens outward, and a second inclined surface that is formed in the protrusion and inclines toward the existing pipe side end of the gate valve, and Branch pipe connection method that makes the surfaces contact each other.
The first step is to attach the gate valve to a predetermined position on the upper surface of an existing pipe,
After the first step, by integrally rotating the branch case and the gate valve, the split surface of the branch case is positioned in a substantially horizontal direction and the gate valve is tilted, The branch pipe connecting method according to claim 1, wherein the branch pipe connecting method is transferred to the second step.   In the first step, the pair of protrusions provided at positions shifted in angle with respect to the moving direction of the valve element built in the gate valve are arranged in the vertical direction in the second step. The branch pipe connection method according to claim 1 or 2, wherein the branch pipe connection method is fitted into the recess.   The branch pipe connecting method according to claim 3, wherein the pair of protrusions are provided in a direction substantially orthogonal to a moving direction of the valve body.   The end face of the existing pipe side of the gate valve has a lining layer made of a material softer than the constituent material of the valve box of the gate valve, and has a concave shape along the outer peripheral surface of the existing pipe. The branch pipe connecting method according to any one of claims 1 to 4, wherein in the step 1, the gate valve is attached to a predetermined position on the upper surface of the existing pipe via the lining layer.   The chips generated in the drilling operation in the third step are discharged from a discharge portion provided in the branch case together with the fluid flowing into the branch case from the existing pipe. The branch pipe connection construction method according to any one of claims.   In the second step, the fastener is tightened to increase a contact area between the first inclined surface and the second inclined surface, and the first inclined surface presses the second inclined surface, In addition to acting in the direction away from the branch valve from the branch case, the inner rib wall of the concave groove formed to fit the seal material on the inner peripheral surface of the branch case near the gate valve side end, and The branch pipe connection according to any one of claims 1 to 6, wherein an extension portion formed on an existing pipe side end face of the gate valve is contacted to stop the gate valve from moving away from the branch case. Construction method. A branch case comprising a split body having a flange portion, water-tightly attachable to an existing pipe, and a gate valve connected to the branch case and connectable to the branch pipe, the branch pipe being the existing pipe In the branch pipe connection device that enables connection,
Wherein formed in the partition valve end of the branch casing, and the recess having a first inclined surface that opens outwardly inclined expanded shape, provided on the outer circumferential surface of the existing pipe-side end portion of the gate valve, the A projection having a second inclined surface that inclines in a direction downward toward the existing pipe side end of the gate valve, and when the branch case and the gate valve are connected, the projection is fitted into the recess. The first inclined surface and the second inclined surface are configured to be in surface contact with each other,
In the split surface of the branch case, the flange portions of the split body are fastened by a fastener, and the connection of the branch case and the gate valve is made via a sealing material by fastening the fastener,
The branch pipe is configured to be connectable to the existing pipe in a state where the partition valve is tilted around the axis so that the dividing surface is positioned in a substantially horizontal direction and the top of the gate valve does not face upward . A branch pipe connecting device characterized by that.
  9. The pair of protrusions provided at positions shifted in angle with respect to the moving direction of a valve body incorporated in the gate valve are configured to be fitted into the pair of concave portions arranged in the vertical direction. The branch pipe connecting device described.   The branch pipe connecting device according to claim 9, wherein the pair of protrusions are provided in a direction substantially orthogonal to a moving direction of the valve body.   The existing pipe side end face of the gate valve has a lining layer made of a material softer than the constituent material of the valve box of the gate valve, and has a concave shape along the outer peripheral surface of the existing pipe. The branch pipe connecting device according to any one of the above.   The branch pipe connection device according to any one of claims 8 to 11, wherein a discharge portion capable of discharging a fluid flowing into the branch case from the existing pipe is provided in the branch case.   As the fastener is tightened, the contact area between the first inclined surface and the second inclined surface increases, the first inclined surface presses the second inclined surface, and the gate valve from the branch case. A recess groove is formed on the inner peripheral surface of the branch case near the gate valve side end portion, and an inner protrusion that constitutes the recess groove is formed. The striking wall and an overhang portion formed on an existing pipe side end surface of the gate valve come into contact with each other, and the gate valve can be stopped from moving away from the branch case. The branch pipe connecting device according to any one of the preceding claims.

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