JP5160318B2 - Branch pipe connection device and branch pipe connection method - Google Patents

Description

  The present invention relates to a branch pipe connecting device that enables a branch pipe to be connected to an existing pipe, and a branch pipe connecting method using the branch pipe connecting device.

  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.

  12 and 13 are front views for explaining an example of a conventional branch pipe connection device. This device includes a bifurcated case 51 that is divided into left and right parts, and a gate valve 52 that is flange-connected to the branch case 51. At the time of construction, first, as shown in FIG. 12, the branch case 51 is externally fitted to the existing pipe K, the divided surfaces are flange-connected, and mounted in a watertight state. And the flange part 51a of the branch case 51 and the flange part 52a of the gate valve 52 are fastened with a volt | bolt and a nut, and the branch case 51 and the gate valve 52 are connected.

  Next, the flange portion 52 b of the gate valve 52 and the flange portion 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 inside. And as shown in FIG. 13, the punching apparatus 53 is removed and the 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 of the connection place becomes difficult.

  Therefore, in the branch pipe connecting device described in the following Patent Document 2 by the present applicant, the split surface of the branch case that is flange-connected by the fastener is positioned in a substantially horizontal direction, and the branch case and the gate valve are fastened by fastening the fastener. Connection is made. In this document, as shown in FIG. 14, a protrusion 66 provided on the outer peripheral surface in the vicinity of the existing pipe-side end of the gate valve 62 is fitted into a recess 65 formed at the gate-side end of the branch case 61 so as to expand. The inclined surface 65a of the concave portion 65 which is inclined in the diameter and opened to the outside is brought into surface contact with the inclined surface 66a of the protrusion 66, and the inclined surface 65a presses the inclined surface 66a by tightening the fastener, thereby partitioning from the branch case 61. It is disclosed to fix the valve 62 away.

However, in such a device, even if the fastener is tightened, the split surface of the branch case may not be closed securely, and there is a backlash between the branch case and the gate valve, or the surface of the sealing material interposed between them. Since sufficient pressure was not obtained, it was necessary to correct the connection work and the workability was not sufficient. The inventors of the present invention have made extensive studies on this problem, found the following a to c as causes of such a phenomenon, and found that there is a possibility that the workability can be improved by improving this.
a: Positioning accuracy when fitting the projection into the recess is severe, and when the projection and the recess are displaced along the pipe circumferential direction of the gate valve, the recess tends to ride on the projection and not fit smoothly It is in.
b: When the branch case and the gate valve are bent relatively (the gate valve is inclined in the arrow direction S in FIG. 14), the inclined surface of the protrusion pushes up the inclined surface of the concave portion with the P portion in FIG. The branch case acts to expand the diameter.
c: Since the gate valve is moved away from the branch case while sliding the inclined surface of the protrusion and the inclined surface of the recess by tightening the fastener, the frictional resistance between the protrusion and the recess is large, and the dividing surface of the branch case is smoothly closed. It is difficult.
JP 2002-154004 A JP 2007-309474 A

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a branch pipe connecting device and a branch pipe that can easily and surely close a split surface of a branch case by tightening a fastener to improve workability. It is to provide a connection method.

The above object can be achieved by the present invention as described below. That is, the branch pipe connection device according to the present invention includes a branch case configured by a split body 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. in the branch pipe connecting device that can be connected to the branch pipe to the existing pipe, and projection is provided with a peripheral wall surface of the tapered inner peripheral face of the partition valve side end of the branch casing, before Symbol gate valve A recess is formed on the outer peripheral surface of the existing pipe side end, and when the gate valve is connected to the branch case, the protrusion is fitted into the recess, and the peripheral wall surface of the protrusion and the wall surface of the recess are In the split surface of the branch case, the flange portions of the split body are fastened by a fastener, the split surface is positioned in a substantially horizontal direction, and the fastener is fastened. Above Connection between Toki case and the gate valve is of the name of via the sealing material.

  According to the branch pipe connecting device of the present invention, the above-described a to c can be relaxed or eliminated, and the split surface of the branch case can be easily and reliably closed by tightening the fastener to improve workability. That is, in the present invention, when connecting the gate valve to the branch case, a projection having a tapered peripheral wall surface provided on the branch case side is fitted into the recess on the gate valve side, and the peripheral wall surface of the projection faces the wall surface of the recess. Because of the contact, even if a slight misalignment occurs, it is difficult for the protrusion to get on the recess, and the protrusion is smoothly fitted into the recess by fastening the fastener.

  Further, in the present invention, since the protrusion has the tapered peripheral wall surface, the branch case and the gate valve are relatively bent, and a twisting direction force acts between the peripheral wall surface of the protrusion and the wall surface of the recess. However, it is difficult for the concave portion to push up the protrusion, and the split case can be prevented from being expanded in diameter and opening the dividing surface. In addition, when connecting the gate valve to the branch case, it is not necessary to slide the peripheral wall surface of the projection and the wall surface of the recess to move the gate valve away from the branch case, so the frictional resistance between the projection and the recess becomes excessively high. Avoiding this, it can be smoothly closed while guiding the dividing surface of the branch case.

  In addition, in the branch pipe connecting device according to the present invention, there is provided a fastener in which 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. It is done by tightening. 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.

In the above, it is preferable that the protrusion is provided in a conical shape or a truncated cone shape . According to such a configuration, a Rukoto tapered circumferential wall of the projection is tapered form, can be obtained more suitably the effect of the present invention described above. In particular, when the protrusion has a conical shape, an angular portion is not formed on the peripheral wall surface, so that it is possible to effectively suppress the climbing into the recess.

  In the above, it is preferable that the concave portion is formed in a conical shape or a truncated cone shape. According to this configuration, since the wall surface of the recess is tapered together with the peripheral wall surface of the protrusion, the peripheral wall surface of the protrusion and the wall surface of the recess are easily brought into surface contact with each other.

  In the above, a concave groove for fitting the sealing material is formed on the inner peripheral surface of the branch valve side end of the branch case, and the concave groove is formed in a state where the projection is fitted in the concave portion. An inner ridge wall and an overhang formed on the end face of the existing pipe of the gate valve come into contact with the pipe axis direction of the gate valve so that the gate valve can be prevented from moving away from the branch case. What is formed is preferable. According to such a configuration, in addition to the projection and the concave portion being in surface contact, the inner protruding wall and the overhanging portion are in contact in the axial direction, thereby connecting the branch case and the gate valve. The strength can be effectively increased.

In one aspect of the branch pipe connecting device according to the present invention, a soft sheet material is interposed between the protrusion and the recess . According to such a configuration, since the relative shake between the protrusion and the recess can be suppressed and the connection between the branch case and the gate valve can be stabilized, the split surface of the branch case can be easily and reliably closed by tightening the fastener. .

In another aspect of the branch pipe connection device according to the present invention, the protrusion is provided on the inner peripheral surface of the extension portion formed to extend on the gate valve side end surface of the branch case, and the extension portion includes A notch for thinning the base is formed . According to such a configuration, when the branch case and the gate valve are relatively bent, the extension portion easily follows and deforms, and therefore, the diameter of the branch case is more reliably prevented and the dividing surface is opened. This can be effectively suppressed.

Further, the branch pipe connection method according to the present invention uses a branch pipe connection device including a branch case configured by a split body that can be watertightly attached to an existing pipe, and a gate valve that can be connected to the branch pipe. In the branch pipe connection method for connecting the branch pipe to the existing pipe, the branch case is externally fitted to the existing pipe and attached, and the existing pipe side end of the gate valve is attached to the branch valve side end of the branch case. A first step of placing the part in an inserted state, and with the split surface of the branch case positioned in a substantially horizontal direction, the flange parts of the split body are fastened together with a fastener, and the branch case A second step of firmly connecting the gate valve and a perforation device connected to the gate valve to perforate a peripheral wall of the existing pipe; after completion of perforation by the perforation device, the perforation device is removed and the partition is removed; Third work to connect the branch pipe to the valve With the door, the time of connecting the branch casing and the partition valve, the projection having a peripheral wall surface of the thinning previously provided on the inner peripheral surface of the partition valve side end of the branch casing, existing pipe of the gate valve The projection is fitted into a recess formed on the outer peripheral surface of the side end, and the peripheral wall surface of the protrusion is brought into surface contact with the wall surface of the recess.

  According to the branch pipe connection method of the present invention, the above-described a to c can be relaxed or eliminated, and the split surface of the branch case can be easily and reliably closed by tightening the fastener, thereby improving the workability. That is, in the present invention, when connecting the branch case and the gate valve, a projection having a tapered peripheral wall surface provided on the branch case side is fitted into the recess on the gate valve side, and the peripheral wall surface of the projection faces the wall surface of the recess. Since they are brought into contact with each other, even if there is a slight misalignment, the projections are unlikely to ride over the recesses, and the projections are smoothly fitted into the recesses by fastening the fasteners.

  Further, in the present invention, since the protrusion has the tapered peripheral wall surface, the branch case and the gate valve are relatively bent, and a twisting direction force acts between the peripheral wall surface of the protrusion and the wall surface of the recess. However, it is difficult for the concave portion to push up the protrusion, and the split case can be prevented from being expanded in diameter and opening the dividing surface. In addition, when connecting the gate valve to the branch case, it is not necessary to slide the peripheral wall surface of the projection and the wall surface of the recess to move the gate valve away from the branch case, so the frictional resistance between the projection and the recess becomes excessively high. By avoiding this, the dividing surface of the branch case can be closed smoothly.

  In the above, in the second step, by tightening the fastener, the peripheral wall surface of the projection is brought into close contact with the wall surface of the recess, and the inner peripheral surface of the branch valve side end portion of the branch case is sealed. The inner ridge wall of the groove formed to fit the material is brought into contact with an overhang formed on the existing pipe side end surface of the gate valve so that the gate valve moves away from the branch case. It is preferable to be able to stop. According to such a method, in addition to the projection and the recess being in surface contact, the inner protrusion wall and the overhanging portion are in axial contact with each other, thereby connecting the branch case and the gate valve. The strength can be effectively increased.

Hereinafter, embodiments of a branch pipe connection device and a branch pipe connection method 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. The present invention uses a soft sheet material (FIGS. 9 and 10) or a notch (FIG. 10) of an extension portion as will be described later. In FIGS. explain. Figure 1 is a front view showing an example of the branch casing and the partition valve min branch pipes connecting apparatus. FIG. 2 is a plan view of the branch case and the gate valve. 3 is a view of the branch case shown in FIG. 1 as viewed from the right side, and FIG. 4 is a cross-sectional view of the gate valve shown in FIG. In addition, the branch case shown in FIG. 1 is corresponded to the BB arrow cross section of FIG.

  The branch case 1 is composed of divided bodies 1A and 1B that can be water-tightly attached to an existing pipe K (see FIG. 5), and has a split T-shaped pipe shape that is split into two vertically in FIG. A protrusion 10 having a tapered peripheral wall surface is provided on the inner peripheral surface of the branch valve side end of the branch case 1 (the end toward the right side in FIG. 1). A partially projecting extending portion 1a is formed on the end face of the branch case 1 on the gate valve side, and a protrusion 10 is provided on the inner peripheral surface of the extending portion 1a. The protrusion 10 has a conical shape protruding inward, and is provided on each of the divided bodies 1A and 1B.

  On the split surface of the branch case 1, the flange portions of the split bodies 1 </ b> A and 1 </ b> B are fastened by a fastener 3 composed of a bolt and a nut, and tightening the fastener 3 narrows the interval between the split body 1 </ b> A and the split body 1 </ b> B. Finally, the dividing surface is configured to be watertightly closed. Seal members 4 and 5 are mounted on each of the divided bodies 1A and 1B so as to be interposed on the dividing surface of the branch case 1, and when the branch case 1 and the gate valve 2 are connected, the existing pipe side of the gate valve 2 is installed. The sealing material 5 is fitted on the outer peripheral surface of the end (the end toward the left side in FIG. 1).

  The gate valve 2 is formed with an overhanging portion 2 a extending in the pipe circumferential direction on the existing pipe side end surface, and the existing pipe side end is connected to the branch case 1. In addition, the opposite end portion is a receiving portion 2b having an enlarged diameter, which forms a passage through which both end portions can communicate. A jig (not shown) can be attached to the top portion 2c of the gate valve 2, and the passage can be freely blocked by rotating the jig and moving up and down the valve body (not shown).

  A conical recess 20 is formed on the outer peripheral surface in the vicinity of the existing pipe side end of the gate valve 2. In the present embodiment, the four recesses 20 are arranged at equal intervals in the circumferential direction on the top, bottom, left, and right in FIG. The depth of the recess 20 and the gradient of the wall surface correspond to the protrusion 10. At the stage where the branch case 1 and the gate valve 2 are firmly connected, the protrusion 10 is fitted into the recess 20. The 20 wall surfaces are in surface contact with each other.

Hereinafter, the partial branch pipes connecting method, a method of connecting a branch pipe to the existing pipe. First, as shown in FIGS. 5 and 6, the branch case 1 is externally fitted and mounted so as to hold the existing pipe K, and the existing pipe side of the gate valve 2 is attached to the end of the branch valve 1 of the branch case 1. An end portion is inserted (corresponding to the first step). At this stage, the fastener 3 is not firmly fastened, and the split surface of the branch case 1 may be open.

  In the present invention, the installation order of the divided bodies 1A and 1B and the gate valve 2 is not particularly limited. On the contrary, after the gate valve 2 is arranged beside the existing pipe K, the divided bodies 1A and 1B are assembled and branched. The end of the case 1 on the side of the gate valve may be externally fitted to the end of the gate 2 of the existing valve. Alternatively, after the divided body 1B is installed below the existing pipe K, the existing pipe side end of the gate valve 2 is placed on the end of the gate valve 2 and then the divided body 1A is assembled to the divided body 1B. It is also possible.

  The existing pipe side end of the gate valve 2 is inserted into the branch valve side end of the branch case 1 until the protrusion 10 is disposed on the outer peripheral side of the recess 20 as shown in FIG. The pair of recesses 20 formed on the left and right in FIG. 4 are exposed so as to be visible from above as shown in FIG. 6, and can be used as a guide for inserting the gate valve 2 into the branch case 1. Further, at this stage, since the protrusion 10 is not fitted in the recess 20, the gate valve 2 is rotated around the pipe axis as necessary, so that the relative posture between the branch case 1 and the gate valve 2 becomes fine. Can be adjusted.

  Next, in a state where the split surface of the branch case 1 is positioned in a substantially horizontal direction, the flange portions of the split bodies 1A and 1B are fastened by the fasteners 3, and the branch case 1 and the gate valve 2 as shown in FIG. Are connected firmly (corresponding to the second step). At this time, the protrusion 10 is fitted into the recess 20, and the peripheral wall surface 10 a of the protrusion 10 comes into surface contact with the wall surface 20 a of the recess 20. The relative rotation with the gate valve 2 is prevented. Further, by tightening the fastener 3, the branch case 1 and the gate valve 2 are connected via the seal material 5, and the branch case 1 is attached to the existing pipe K in a watertight manner. Thus, the branch pipe connection device is not such that the branch case 1 and the gate valve 2 are flange-connected.

  When connecting the branch case 1 and the gate valve 2, the projection 10 provided on the branch case 1 side is fitted into the recess 20 on the gate valve 2 side, and the peripheral wall surface 10 a of the tapered projection 10 is the wall surface 20 a of the recess 20. Because of the surface contact, the protrusion 10 is unlikely to ride over the recess 20 even if there is a slight misalignment, and is smoothly fitted by fastening the fastener 3. Further, since the branch case 1 is provided with the projections 10 instead of the recesses, it can be easily recognized without looking into from the lower side during construction, and therefore, the positional deviation between the projections 10 and the recesses 20 can be suppressed.

  Furthermore, according to such a configuration, even when the branch case 1 and the gate valve 2 are bent relatively, and a force in the twisting direction acts between the peripheral wall surface 10a and the wall surface 20a, the concave portion 20 causes the protrusion 10 to protrude. The pushing-up force is difficult to occur, and the branch case 1 can be prevented from expanding its diameter to open the dividing surface. Moreover, in the present embodiment, the gate valve 2 is not moved away from the branch case 1 while sliding the peripheral wall surface 10a and the wall surface 20a, so that the frictional resistance between the protrusion 10 and the recess 20 does not become excessively high. The dividing surface of the branch case 1 can be closed smoothly.

  As shown in FIG. 7, in the state where the branch case 1 and the gate valve 2 are firmly connected, the split surface of the branch case 1 is positioned substantially in the horizontal direction, and the axial center direction of the branch pipe connected to the gate valve 2 And 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 3, it is possible to reliably and effectively prevent the fluid inside the pipe from leaking from the connection location.

  The number of the protrusions 10 is not particularly limited, but 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. In order to secure the connection strength between the branch case 1 and the gate valve 2, it is preferable to provide the protrusions 10 on the upper and lower sides of the branch valve side end of the branch case 1 and fit them into the recess 20. Moreover, although the example which formed the recessed part 20 in the circumferential direction four places was shown in the above-mentioned embodiment, the number of the recessed parts 20 may be six or eight considering the inclination of the gate valve 2, etc. This is not a limitation.

  A concave groove 9 into which the sealing material 5 is fitted is formed on the inner peripheral surface of the branch valve side end of the branch case 1, and in the state where the fastener 3 is tightened and the protrusion 10 is fitted into the concave portion 20, As shown in FIG. 7, the inner protruding wall 1 b constituting the groove 9 and the overhanging portion 2 a of the gate valve 2 abut on the pipe axis direction of the gate valve 2 to move the gate valve 2 away from the branch case 1. Can be stopped. Thereby, in addition to the protrusion 10 and the recessed part 20 being in surface contact, the inner protruding wall 1b and the overhanging part 2a are in contact with each other in the axial direction. The connection strength can be effectively increased.

  After the branch case 1 and the gate valve 2 are firmly connected, as shown in FIG. 8, a perforating device 12 is connected to the receiving portion 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 13 built in the drilling device 12 is stopped and the drilling device 12 is removed. 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).

[Another embodiment]
(1) In the above-described embodiment, an example in which conical protrusions and recesses are employed has been shown. However, in the present invention, the protrusion has a tapered peripheral wall surface, and the peripheral wall surface is in surface contact with the wall surface of the recess. If there is, it is not limited to this. Examples of other shapes of the protrusions include a truncated cone shape and a dome shape (hemispherical shape), but a conical shape is preferable in order to achieve smooth fitting while suppressing the climbing into the recess. Other shapes of the recess include a truncated cone shape, a dome shape, and a V groove shape extending in the pipe circumferential direction of the gate valve.

  (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 another embodiment shown in FIG. 9, the soft sheet material 6 is interposed between the protrusion 10 and the recess 20. In this case, since the relative shake between the protrusion 10 and the recess 20 can be suppressed and the connection between the branch case 1 and the gate valve 2 can be stabilized, the split surface of the branch case 1 can be easily and reliably secured by tightening the fastener 3. Easy to close. The soft sheet material 6 should just be softer than the constituent material of the valve case of the branch case 1 or the gate valve 2, for example, is comprised by the rubber sheet. Moreover, the soft sheet material 6 can also be used as a sealing material, and can also be integrally formed with the sealing material 5 fitted in the concave groove 9 as shown in FIG.

  (4) In another embodiment shown in FIG. 10, a cutout 7 is formed in the extending portion 1 a of the branch case 1 to make the root thin. According to such a configuration, when the branch case 1 and the gate valve 2 are bent relatively, the extension portion 1a is deformed following the deformation, and the wall surface of the recess 20 does not exert the effect of pushing up the peripheral wall surface of the protrusion 10. As a result, the diameter of the branch case 1 can be prevented more reliably and the split surface can be effectively prevented from opening.

  (5) In the above-described embodiment, the example in which the protrusion 10 is provided on the inner peripheral surface of the extending portion 1a formed to extend on the end face on the gate valve side of the branch case 1 is shown. As illustrated in FIG. 5, the portion where the protrusion 10 is provided does not have to be extended.

  (6) In the present invention, it is also possible to connect the branch valve to the branch case in a state where the gate valve is tilted, that is, in a state where the gate valve is tilted and tilted around the axis so that the top portion does not face upward. For example, in the above-described embodiment, the top of the gate valve is oriented substantially in the horizontal direction by fitting the projections on the branch case side into the pair of recesses formed on the left and right in FIG. Thereby, even if the height position of the top of the gate valve is lowered and the existing pipe is buried in a shallow layer, the amount of earth covering from the top to the ground can be appropriately obtained.

Front view showing an example of a branch case and a gate valve provided in the branch pipe connection device Plan view of branch case and gate valve shown in FIG. The right side of the branch case shown in Fig. 1 AA arrow sectional view of the gate valve shown in FIG. Front view showing a state where the gate valve is loosely connected to the branch case attached to the existing pipe Plan view showing the state where the gate valve is loosely connected to the branch case attached to the existing pipe Front view showing a state where the gate valve is firmly connected to the branch case Front view showing a state in which a perforation device is connected to the gate valve Cross-sectional view showing the main portion of the branch pipe connecting device according to the present onset bright embodiments Sectional drawing which shows the principal part of the branch pipe connection apparatus which concerns on other embodiment of this invention. Sectional drawing which shows the principal part of the branch pipe connection apparatus which concerns on the form which is not contained in this invention Front view for explaining an example of a conventional branch pipe connection device Front view for explaining an example of a conventional branch pipe connection device (A) principal part perspective view in an example of the branch pipe connection apparatus of the said patent document 2, (b) The figure which looked at the principal part from the right direction, and (c) The longitudinal cross-sectional view of the principal part

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Branch case 1A, 1B Divided body 1a Extension part 1b Inner protrusion wall 2 Gate valve 2a Overhang part 3 Fastener 4, 5 Seal material 6 Soft sheet material 9 Groove 10 Projection 10a Perimeter wall surface 12 Punching device 20 Recess 20a Wall K Existing pipe

Claims (8)

A branch case composed of a split body that can be watertightly attached to an existing pipe, and a gate valve connected to the branch case and connectable to the branch pipe, the branch pipe being connectable to the existing pipe In the branch pipe connecting device
A projection having a tapered peripheral wall surface is provided on the inner peripheral surface of the branch valve side end portion of the branch case, and a concave portion is formed on the outer peripheral surface of the existing pipe side end portion of the gate valve. When the gate valve is connected to the projection, the projection is fitted into the recess, and the peripheral wall surface of the projection and the wall surface of the recess are in surface contact with each other, and a flexible sheet is provided between the projection and the recess. Intervening materials,
In the split surface of the branch case, the flange portions of the split body are fastened by a fastener, the split surface is positioned in a substantially horizontal direction, and the branch case and the gate valve are fastened by fastening the fastener. A branch pipe connecting device characterized in that the connection is made through a sealing material. A branch case composed of a split body that can be watertightly attached to an existing pipe, and a gate valve connected to the branch case and connectable to the branch pipe, the branch pipe being connectable to the existing pipe In the branch pipe connecting device
A projection having a tapered peripheral wall surface is provided on the inner peripheral surface of the branch valve side end portion of the branch case, and a concave portion is formed on the outer peripheral surface of the existing pipe side end portion of the gate valve. When the gate valve is connected to the projection, the projection is fitted into the recess, and the peripheral wall surface of the projection and the wall surface of the recess are in surface contact with each other.
The protrusion is provided on the inner peripheral surface of the extension portion formed to extend on the end face of the branch case on the gate valve side, and the extension portion has a notch for thinning the root,
In the split surface of the branch case, the flange portions of the split body are fastened by a fastener, the split surface is positioned in a substantially horizontal direction, and the branch case and the gate valve are fastened by fastening the fastener. A branch pipe connecting device characterized in that the connection is made through a sealing material . The branch pipe connecting device according to claim 1 or 2, wherein the protrusion is provided in a conical shape or a truncated cone shape. The branch pipe connecting device according to claim 3, wherein the recess is formed in a conical shape or a truncated cone shape. A concave groove for fitting the sealing material is formed on the inner peripheral surface of the branch valve side end portion of the branch case, and in a state where the projection is fitted into the concave portion, an inner ridge constituting the concave groove. The wall and the overhang portion formed on the existing pipe side end face of the gate valve are in contact with the pipe axis direction of the gate valve and can stop the gate valve from moving away from the branch case. The branch pipe connecting device according to any one of claims 1 to 4 . A branch pipe that connects the branch pipe to the existing pipe using a branch pipe connecting device that includes a branch case that is configured to be watertightly attached to the existing pipe and a gate valve that can be connected to the branch pipe. In the connection method,
A first step of fitting and attaching the branch case to the existing pipe, and placing the existing pipe side end of the gate valve in the gate end of the branch case; and
In a state where the split surface of the branch case is positioned in a substantially horizontal direction, the second step of fastening the flange portions of the split body together with a fastener and firmly connecting 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 having a tapered peripheral wall provided on the inner peripheral surface of the branch valve side end of the branch case is connected to the outer periphery of the existing pipe side end of the gate valve. A branch pipe connecting method characterized by being fitted into a recess formed on a surface, and having a soft sheet material interposed between the protrusion and the recess to bring the peripheral wall surface of the protrusion into surface contact with the wall surface of the recess. A branch pipe that connects the branch pipe to the existing pipe using a branch pipe connecting device that includes a branch case that is configured to be watertightly attached to the existing pipe and a gate valve that can be connected to the branch pipe. In the connection method,
A first step of fitting and attaching the branch case to the existing pipe, and placing the existing pipe side end of the gate valve in the gate end of the branch case; and
In a state where the split surface of the branch case is positioned in a substantially horizontal direction, the second step of fastening the flange portions of the split body together with a fastener and firmly connecting 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 having a tapered peripheral wall provided on the inner peripheral surface of the branch valve side end of the branch case is connected to the outer periphery of the existing pipe side end of the gate valve. Fit into the recess formed on the surface, the peripheral wall surface of the protrusion is in surface contact with the wall surface of the recess,
The protrusion is provided on the inner peripheral surface of the extension portion formed to extend on the end face of the branch case on the gate valve side, and the extension portion is formed with a notch for thinning the base. A characteristic branch pipe connection method. In the second step, by tightening the fastener, the peripheral wall surface of the protrusion is brought into close contact with the wall surface of the recess, and a sealing material is placed on the inner peripheral surface of the end portion on the side of the gate valve of the branch case. It is possible to stop the partition valve from moving away from the branch case by bringing the inner ridge wall of the recessed groove formed for fitting into contact with an overhang formed on the existing pipe side end surface of the gate valve. The branch pipe connection method according to claim 6 or 7 .

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