Branch saddle and method of constructing branch saddle

Abstract

To provide a branch saddle from which water is less likely to leak, and to provide a method of constructing a branch saddle.SOLUTION: A branch saddle includes: a saddle part 10; a first branch pipe part 20 projecting from the saddle part 10; a second branch pipe part 30 installed in the middle of the first branch pipe part 20; and a blocking part 60 installed to the second branch pipe part 30.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a branch saddle and a method for installing a branch saddle.

Background Art

[0002] In recent years, it has become mainstream to lay main water pipes with resin pipes made of polyethylene or the like, which are superior in earthquake resistance, corrosion resistance, etc. compared to metal pipes. In response to this, a structure has been proposed as described in Patent Document 1, which enables on-site construction from drilling a branch hole in a branch saddle to water supply without stopping the water flow. This branch saddle is a branch saddle to be attached to a resin pipe, and includes a straight pipe portion formed with a female screw hole penetrating vertically inside, a branch portion provided in the middle of the straight pipe portion, and a branch cylinder erected at the lower part of the straight pipe portion.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the conventional branch saddle, when performing construction such as attaching the branch saddle in a non-stop water state and drilling the main pipe, if the construction is incorrect, there is a risk of water leakage from the branch portion of the branch saddle.

[0005] An object of the present invention is to provide a branch saddle with low water leakage and a method for installing a branch saddle.

Means for Solving the Problems

[0006] The present invention has been made to solve the above problems and proposes the following means. The branch saddle according to one aspect of the present invention includes a saddle portion, a first branch pipe portion protruding from the saddle portion, a second branch pipe portion provided in the middle of the first branch pipe portion, and a closing portion provided in the second branch pipe portion.

Effect of the Invention

[0007] According to the branch saddle and the construction method of the branch saddle of the present invention, it is possible to provide a branch saddle and a construction method of the branch saddle in which water is less likely to leak.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Mode for Carrying Out the Invention

[0009] Hereinafter, with reference to FIG. 1, a branch saddle 100 according to an embodiment of the present invention will be described. FIG. 1 is a cross-sectional view showing a branch saddle according to an embodiment of the present invention. As shown in FIG. 1, the branch saddle 100 is disposed on the outer peripheral surface of the main pipe P. The branch saddle 100 includes a saddle portion 10, a first branch pipe portion 20, a second branch pipe portion 30, a seal plug 40, a cap 50, and a closing portion 60. Also, hereinafter, the direction along the central axis of the first branch pipe portion 20 or the second branch pipe portion 30 is referred to as the axial direction, and in a plan view of the first branch pipe portion 20 or the second branch pipe portion 30 viewed from the axial direction, the direction intersecting the central axis is referred to as the radial direction. Further, the direction of orbiting around the central axis in the plan view is referred to as the circumferential direction. Furthermore, the X direction shown in each figure refers to a direction parallel to the axial direction of the second branch pipe portion 30, and the Y direction shown in each figure refers to a direction parallel to the axial direction of the first branch pipe portion 20. Also, in the XY direction shown in each figure, the direction indicated by the + direction is the positive direction, and the direction indicated by the - direction is the negative direction. In particular, the positive direction in the Y direction is the upward direction, and the negative direction in the Y direction is the downward direction.

[0010] The branch saddle 100 may be used as a branch saddle for water supply pipes, sewer pipes, gas pipes, etc., but is not limited thereto. Furthermore, the branch saddle 100 is preferably made of a thermoplastic resin. More preferably, it is made of a polyolefin-based resin. In particular, when the branch saddle 100 is used as a branch saddle for water supply pipes, sewer pipes, gas pipes, etc. as described above, the branch saddle 100 is more preferably made of high-density polyethylene (PE), medium-density PE, or low-density PE.

[0011] The outer diameters of the first branch pipe portion 20 and the second branch pipe portion 30 are smaller than the outer diameter of the main pipe P. Desirably, the outer diameter of the main pipe P is 63 mm to 250 mm, and the outer diameters of the first branch pipe portion 20 and the second branch pipe portion 30 are 27 mm to 63 mm.

[0012] The saddle portion 10 is a portion that contacts the main pipe P. The surface of the saddle portion 10 that contacts the main pipe P has a shape along the outer peripheral surface of the main pipe P. The surface of the saddle portion 10 that contacts the main pipe P has, for example, a curved surface with the same curvature as the curvature of the outer peripheral surface of the main pipe P. In addition, a branch hole 11 is formed in the saddle portion 10. After the main pipe P is drilled, the drilled portion of the main pipe P is taken out through the branch hole 11.

[0013] The first branch pipe portion 20 is a branch pipe rising from the peripheral edge of the branch hole 11. Specifically, the first branch pipe portion 20 rises to the outside in the radial direction of the main pipe P. The first branch pipe portion 20 is a tubular member. Further, the upper end of the first branch pipe portion 20 is open. In addition, an internal thread 21 and an external thread 22 are provided on the inner peripheral surface of the first branch pipe portion 20. In particular, the external thread 22 is provided on the outer periphery of the upper end of the branch pipe portion 20.

[0014] The second branch pipe portion 30 is a branch pipe protruding laterally from the first branch pipe portion 20. In addition, the second branch pipe portion 30 is located below the external thread 22 in the first branch pipe portion 20. More specifically, the second branch pipe portion 30 is located below the external thread 22 and above the lower end of the first branch pipe portion 20. The inside of the second branch pipe portion 30 can communicate with the inside of the first branch pipe portion 20. The second branch pipe portion 30 faces outward with respect to the first branch pipe portion 20 and has a connection end portion 31 that is connected to a closing portion 60 described later.

[0015] The second branch pipe portion 30 can communicate with a separate pipe O through a joint F formed with receiving port portions F1 at both ends (see, for example, FIG. 6). More specifically, the second branch pipe portion 30 and the separate pipe O are respectively inserted into the receiving port portions F1 of the joint F, and the second branch pipe portion 30 and the separate pipe O communicate. Therefore, the length of the second branch pipe portion 30 needs to be longer than the length of the receiving port portion F1 of the joint F. The joint F is, for example, an electric fusion joint for both receiving ports.

[0016] The seal plug 40 is provided as a stopper inside the first branch pipe portion 20. As shown in FIG. 1, the seal plug 40 includes an external thread 41, a first O-ring 42, and a second O-ring 43. The external thread 41 is provided on the outer peripheral surface of the seal plug 40. The first O-ring 42 and the second O-ring 43 are both provided on the outer peripheral surface of the seal plug 40. The second O-ring 43 is provided below the first O-ring on the outer peripheral surface of the seal plug 40. As will be described later, the first O-ring 42 and the second O-ring 43 are respectively accommodated in the first circumferential groove 44 and the second circumferential groove 45.

[0017] Furthermore, a concave portion 40a, a first circumferential groove 44, and a second circumferential groove 45 are formed in the seal plug 40. The concave portion 40a is provided on the top surface of the seal plug 40 and is formed so that a tool can be inserted. The first circumferential groove 44 is a groove formed on the outer peripheral surface of the seal plug 40 and accommodates the first O-ring 42. The second circumferential groove 45, similar to the first circumferential groove 44, is a groove formed on the outer peripheral surface of the seal plug 40 and accommodates the second O-ring 43. The second circumferential groove 45 is formed below the first circumferential groove 44 on the outer peripheral surface of the seal plug 40.

[0018] The assembling method of the first branch pipe portion 20 provided with the above-described female screw 21 and the seal plug 40 provided with the male screw 41 will be described below. First, the female screw 21 of the first branch pipe portion 20 and the male screw 41 of the seal plug 40 are screwed together. At this time, the seal plug 40 may be rotated with respect to the first branch pipe portion 20 by rotating the tool with the tool inserted into the concave portion 40a. Thereby, as shown in FIG. 1, the opening at the upper end of the first branch pipe portion 20 can be closed by the seal plug 40.

[0019] Also, by advancing the screwing of the female screw 21 of the first branch pipe portion 20 and the male screw 41 of the seal plug 40, the seal plug 40 can be pushed down to the lower end of the first branch pipe portion 20 in a state where the O-ring 42 of the seal plug 40 is in contact with the inner peripheral surface of the first branch pipe portion 20 (see, for example, FIG. 4).

[0020] After closing the lower end of the first branch pipe portion 20 with the seal plug 40 in this way, rotate it in the direction of loosening the screw engagement between the female screw 21 of the first branch pipe portion 20 and the male screw 41 of the seal plug 40, and move the seal plug 40 upward above the first branch pipe portion 20, thereby enabling the release of the blockage of the fluid flowing through the main pipe P from flowing into the first branch pipe portion 20.

[0021] The cap 50 is provided at the upper end of the first branch pipe portion 20. Further, the cap 50 covers the open portion of the first branch pipe portion 20. The cap 50 includes a female screw 51 and a rubber packing 52. The female screw 51 is formed on the inner peripheral surface of the cap 50 and engages with the male screw 22. The rubber packing 52 is provided at the upper end of the female screw 51 and fills the gap between the cap 50 and the first branch pipe portion 20.

[0022] Similar to the second branch pipe portion 30, the closing portion 60 is a tubular member that protrudes laterally from the first branch pipe portion 20 and has one end closed. Therefore, even when water enters the second branch pipe portion 30 after the main pipe P is drilled, it is possible to make it difficult for water to leak from the second branch pipe portion 30. Note that the closing portion 60 is separately formed from the second branch pipe portion 30 or the first branch pipe portion 20.

[0023] Furthermore, it is preferable that the outer diameter of the closing portion 60 is equal to the outer diameter of the second branch pipe portion 30. More specifically, it is preferable that the outer diameter of the closing portion 60 has the same nominal diameter as the outer diameter of the second branch pipe portion 30, and the difference between the outer diameters of the two is within the dimensional error range of the nominal diameter.

[0024] Also, the closing portion 60 has a closed end portion 61, a connecting end portion 62, an inner ridge portion 63, an outer ridge portion 64, and a cutting line L. The closed end portion 61 is the end portion of the two end portions of the blocking portion 60 that is not connected to the second branch pipe portion 30. Further, the closed end portion 61 is an arcuate end portion formed so as to close while gradually reducing its diameter toward the outside of the first branch pipe portion 20. However, the shape of the closed end portion 61 of the blocking portion 60 is not limited to this. For example, the closed end portion 61 may not reduce its diameter, the tip portion of the closed end portion 61 may be square, and the angle formed by the outer peripheral surface of the closed end portion 61 and the tip portion may be a right angle.

[0025] The connection end portion 62 is the end portion of the two end portions of the blocking portion 60 that is connected to the second branch pipe portion 30. The connection end portion 62 of the blocking portion 60 is connected in a state where it abuts against the connection end portion 31 of the second branch pipe portion 30. Therefore, the connection end portion 62 of the blocking portion 60 and the connection end portion 31 of the second branch pipe portion 30 may be connected by butt fusion or may be connected by concave-convex fitting. In the illustrated example, the connection end portion 62 of the blocking portion 60 and the connection end portion 31 of the second branch pipe portion 30 are connected by butt fusion, and the blocking portion 60 and the second branch pipe portion 30 are integrated. In this case, even when water pressure is applied to the second branch pipe portion 30 after the main pipe P is perforated, compared with the case of being connected by the concave-convex fitting, it is possible to make it more difficult for water to leak from the second branch pipe portion 30. Therefore, preferably, the connection end portion 62 of the blocking portion 60 is connected to the connection end portion 31 of the second branch pipe portion 30 by butt fusion.

[0026] As shown in FIG. 1, the inner ridge portion 63 and the outer ridge portion 64 are respectively formed on the inner peripheral surface and the outer peripheral surface of the connection end portion 62. The inner ridge portion 63 and the outer ridge portion 64 are formed when a part of the connection end portion 62 is melted by the heat of fusion when the blocking portion 60 and the second branch pipe portion 30 are connected by butt fusion as described above, and the melted portion is located inside and outside the connection end portion 62.

[0027] Here, the blocking part 60 may be cut at an intermediate part after piercing the main pipe P. Further, after cutting the blocking part 60 at an intermediate part, the blocking part 60 may communicate with a separate pipe O via a joint F in the same manner as the second branch pipe part 30. At this time, the blocking part 60 and the separate pipe O are respectively inserted into the receiving port parts F1 formed at both ends of the joint F, and the blocking part 60 and the separate pipe O communicate with each other (see, for example, FIG. 6). When the blocking part 60 is cut at an intermediate part in this way and the blocking part 60 and the separate pipe O communicate with each other via the joint F, the part from the end face of the blocking part 60 connected to the second branch pipe part 30 to the cut surface of the blocking part 60 is inserted into the receiving port part F1 of the joint F. Therefore, the distance from the end face of the blocking part 60 connected to the second branch pipe part 30 to the cut surface of the blocking part 60 needs to be longer than the length of the receiving port part F1 of the joint F.

[0028] Even when the inner protrusion part 63 and the outer protrusion part 64 are respectively formed on the inner peripheral surface and the outer peripheral surface of the connection end part 62, after cutting the blocking part 60 at an intermediate part, the blocking part 60 may communicate with the separate pipe O via the joint F in the same manner as the second branch pipe part 30. At this time, the blocking part 60 is inserted into the receiving port part F1 of the joint F, but the inner protrusion part 63 and the outer protrusion part 64 are respectively formed on the inner peripheral surface and the outer peripheral surface of the connection end part 62. Therefore, first, it is necessary to insert the blocking part 60 into the receiving port part F1 of the joint F while avoiding the inner protrusion part 63 and the outer protrusion part 64. And the length of the blocking part 60 excluding the inner protrusion part 63 and the outer protrusion part 64 must be longer than the length of the receiving port part F1.

[0029] As shown in FIG. 1, a cutting reference line L is printed on the outer peripheral surface of the blocking part 60. The cutting reference line L is a reference line that serves as a mark when cutting the blocking part 60 described later. More specifically, the cutting reference line L is printed circumferentially along the outer peripheral surface at the cut surface where the blocking part 60 is scheduled to be cut. Further, the timing of printing the cutting reference line L may be arbitrary as long as it is before the timing of cutting the blocking part 60. Although FIG. 1 shows the cutting reference line L printed in a solid line, it is not limited thereto. For example, the cutting reference line L may be printed in a broken line, a dotted line, or the like. For example, the cutting reference line L may be a concave part or a convex part.

[0030] Here, the position of the cutting line L in the axial direction of the blocking portion 60 will be described below. FIG. 1 shows a case where the cutting line L is located in the middle of the blocking portion 60. More specifically, the cutting line L is located in a portion excluding the closed end portion 61 and the connection end portion 62.

[0031] On the other hand, the cutting line L is not limited to the position as described above. For example, the cutting line L may be located on the outer peripheral surface of the connection end portion 62 which is the connection portion between the blocking portion 60 and the second branch pipe portion 30, or may be located on the outer peripheral surface of the closed end portion 61. However, it is preferable that the cutting line L is located on the outer peripheral surface of the closed end portion 61.

[0032] When the cutting line L is located on the outer peripheral surface of the connection end portion 62, since the blocking portion 60 is cut at the outer peripheral surface of the connection end portion 62, the length of the blocking portion 60 becomes significantly smaller than that of the second branch pipe portion 30. In this case, when connecting the separate pipe O to the blocking portion 60 via the joint F as described above, since the length of the blocking portion 60 becomes smaller, a portion combining the blocking portion 60 and the second branch pipe portion 30 will be inserted into the receiving port portion F1 of the joint F. Therefore, it is necessary to make the length of the second branch pipe portion 30 longer compared to the case where the blocking portion 60 is not cut at the outer peripheral surface of the connection end portion 62. Furthermore, since the main pipe P is located directly below the second branch pipe portion 30, when cutting the blocking portion 60 at the outer peripheral surface of the connection end portion 62 connected to the connection end portion 31 of the branch pipe portion 30, there is a possibility of damaging the main pipe P when cutting the blocking portion 60.

[0033] When the cutting reference line L is located on the outer peripheral surface of the closed end portion 61, since the blocking portion 60 is cut on the outer peripheral surface of the closed end portion 61, the length of the blocking portion 60 will not be significantly smaller than that of the second branch pipe portion 30. Therefore, when the blocking portion 60 is cut on the outer peripheral surface of the connection end portion 62, it is necessary to increase the length of the second branch pipe portion 30, while in this case, it is not necessary to increase the length of the second branch pipe portion 30. Accordingly, when the cutting reference line L is located on the outer peripheral surface of the closed end portion 61, compared with the case where the cutting reference line L is located on the outer peripheral surface of the connection end portion 62, the branch saddle 100 can be made more compact, and the workability can be improved better.

[0034] Here, the cutting reference line L may not be printed on the outer peripheral surface of the blocking portion 60. In this case, when cutting the blocking portion 60, it is preferable that it is possible to visually recognize the portion where the cutting of the blocking portion 60 is planned. For example, the color of the outer peripheral surface on the cutting surface where the cutting of the blocking portion 60 is planned may be molded so as to be distinguishable from the color of the outer peripheral surface where no cutting is planned. Further, the outer diameter of the outer peripheral surface on the cutting surface where the cutting of the blocking portion 60 is planned may be molded to be smaller or larger compared to the outer diameter of the outer peripheral surface where no cutting is planned. For example, the outer peripheral surface on the cutting surface where the cutting of the blocking portion 60 is planned may be molded to form a step with the outer peripheral surface where no cutting is planned, or may be molded into a concave shape or a convex shape.

[0035] The blocking portion 60 is preferably made of a thermoplastic resin. In this case, the blocking portion 60 can be easily cut at the construction site. Further, when the second branch pipe portion 30 is also made of a thermoplastic resin, the blocking portion 60 can be fused and connected to the second branch pipe portion 30.

[0036] Next, the construction method of the branch saddle 100 (steps S010 to S090) will be described with reference to FIGS. 2 to 7.

[0037] First, as shown in FIG. 2, the branch saddle 100 is fused to the main pipe P (step S010). Specifically, first, the position on the outer peripheral surface of the main pipe P where the saddle portion 10 of the branch saddle 100 is to be fused is positioned before fusing to the main pipe P. Then, the saddle portion 10 is fused to the position using a fusion jig or the like. Note that FIG. 2 shows an example of the branch saddle 100 after it has already been fused to the main pipe P.

[0038] Next, as shown in FIG. 3, the cap 50 provided at the upper end of the first branch pipe portion 20 is removed from the first branch pipe portion 20 (step S020). Further, after removing the cap 50 from the first branch pipe portion 20 in step S020, a hydraulic pressure test (not shown) is performed (step S030). In the hydraulic pressure test, a hydraulic pressure test jig (not shown) is attached to the upper end of the first branch pipe portion 20, and by applying a hydraulic pressure into the branch saddle 100, the presence or absence of water leakage between the saddle portion 10 and the main pipe P is confirmed. After the hydraulic pressure test is completed, the hydraulic pressure test jig (not shown) is removed from the first branch pipe portion 20.

[0039] Furthermore, after step S030, the main pipe P is drilled (step S040). The drilling procedure of the main pipe P will be briefly described below. First, a valve (not shown) provided in the main pipe P is opened, and a drilling jig (not shown) for drilling the main pipe P is inserted from above the first branch pipe portion 20. After drilling the main pipe P with the drilling jig (not shown), the drilling jig (not shown) is removed from the branch saddle 100 with the valve (not shown) closed so that the fluid flowing through the main pipe P does not flow into the branch saddle 100 side.

[0040] Next, as shown in FIG. 4, the seal plug 40 is moved to the lower end of the first branch pipe portion 20 (step S050). Thereby, it is possible to make it difficult for the fluid flowing through the main pipe P to flow into the first branch pipe portion 20 or the second branch pipe portion 30.

[0041] Next, the blocking portion 60 is cut at the middle portion (step S060). FIG. 5 shows a branch saddle provided with the blocking portion cut at the middle portion. A detailed description of the cutting method of the blocking portion 60 has already been described and will be omitted. Also, after cutting the blockage portion 60 in step S060, the blockage portion 60 does not close and is in an open state. Therefore, after the end of step S060, the fluid flowing through the main pipe P may flow out from the blockage portion 60 through the first branch pipe portion 20 and the second branch pipe portion 30. Accordingly, in order to make it difficult for the fluid flowing through the main pipe P to flow into the first branch pipe portion 20 or the second branch pipe portion 30, similar to step S060, the seal plug 40 remains located at the lower end of the first branch pipe portion 20.

[0042] Next, as shown in FIG. 6, the blockage portion 60 is communicated with a separate pipe O via a joint F (step S070). At this time, as described above, the blockage portion 60 and the separate pipe O are respectively inserted into the receiving port portions F1 formed at both ends of the joint F, and the blockage portion 60 and the separate pipe O are communicated. Further, the joint F may be provided with a heating wire (not shown), and the second branch pipe portion 30 and the separate pipe O may be heated by the heating wire, and both may be heat-sealed to the joint F.

[0043] Here, as shown in FIG. 7, the construction method of the branch saddle 100 may include a step S080 of completely cutting the blockage portion 60 from the branch saddle 100 and communicating the second branch pipe portion 30 with a separate pipe O via a joint F when the cutting of the blockage portion 60 in step S060 fails. More specifically, as described above, the second branch pipe portion 30 and the separate pipe O are respectively inserted into the receiving port portions F1 formed at both ends of the joint F, and the second branch pipe portion 30 and the separate pipe O are communicated.

[0044] Next, when it can be confirmed that the blockage portion 60 or the second branch pipe portion 30 is communicated with the separate pipe O in step S070 or step S080, the seal plug 40 is moved to an appropriate position (step S090). When it is desired to put the main pipe P and the first branch pipe portion 20 in a water-passing state, as shown in FIG. 1, the seal plug 40 is moved above the first branch portion 20, and a valve (not shown) is opened, so that the blockage of the fluid flowing through the main pipe P from flowing into the first branch pipe portion 20 can be released. Accordingly, the fluid flowing through the main pipe P flows into the separate pipe O through the first branch pipe portion 20 and the second branch pipe portion 30 or the blockage portion 60. On the other hand, when it is desired to put the main pipe P and the first branch pipe portion 20 in a water-stopped state, as shown in FIG. 4, by keeping the seal plug 40 positioned at the lower end of the first branch pipe portion 20, it is possible to block the fluid flowing through the main pipe P from flowing into the first branch pipe portion 20.

[0045] According to the branch saddle 100 according to the above-described embodiment, the closing portion 60 is connected to the second branch pipe portion 30. Thereby, when the main pipe P is drilled, it is possible to make it difficult for water to leak from the branch saddle 100.

[0046] Furthermore, the closing portion 60 of the branch saddle 100 is made of a thermoplastic resin. Thereby, the closing portion 60 can be easily cut at the actual site where the construction is carried out. Further, when the second branch pipe portion 30 is also made of a thermoplastic resin, the closing portion 60 can be fused and connected to the second branch pipe portion 30.

[0047] Furthermore, the connection end portion 31 of the second branch pipe portion 30 and the connection end portion 62 of the closing portion 60 are connected in a butted state, and inner ridges 63 and outer ridges 64 are provided on the inner peripheral surface and the outer peripheral surface, respectively, at the connection portion between the connection end portion 31 of the second branch pipe portion 30 and the connection end portion 62 of the closing portion 60. The second branch pipe portion 30 and the closing portion 60 are manufactured by being integrated by fusion. Therefore, when the connection end portion 31 of the second branch pipe portion 30 and the connection end portion 62 of the closing portion 60 are fused and connected and the two are integrated, compared to the case where the two are fitted as concave and convex shapes, even when water pressure is applied to the closing portion 60 during construction, work can be carried out in a state where water is less likely to leak.

[0048] A joint F having a receiving portion F1 is connected to the closing portion 60, and the length of the closing portion 60 is longer than the length of the receiving portion F1 of the joint F. In other words, among the cut closing portion 60, the length excluding the inner ridges 63 and the outer ridges 64 is longer than the length of the receiving portion F1. In this way, since the length of the closing portion 60 is longer than the length of the receiving portion F1 of the joint F, the receiving portion F1 of the joint F can be connected to the closing portion 60.

[0049] The construction method of the branch saddle 100 described above includes a step S010 of fusing the saddle part 10 to the main pipe P, a step S040 of piercing the main pipe P, and a step S060 of cutting the closing part 60 at a middle part after the step S040. Therefore, at the time of executing the step S040 of piercing the main pipe P, the closing part 60 is connected to the connection end part 31 of the second branch pipe part 30. Therefore, compared with the construction method of the branch saddle without the step S060, it is possible to make it difficult for water to leak from the branch saddle 100 while executing the step S040 of piercing the main pipe P.

[0050] Note that the technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

[0051] As shown in FIG. 8, the seal plug 40 of the branch saddle 100 according to a modification of an embodiment of the present invention does not include an O-ring corresponding to the first O-ring 42 or the second O-ring 43 according to an embodiment of the present invention. Note that the branch saddle 100 according to the modification includes a closing part 60 provided in the second branch pipe part 30, similar to the branch saddle according to an embodiment of the present invention.

[0052] Furthermore, as shown in FIG. 9, the seal plug 40 of the branch saddle 100 according to still another modification of an embodiment of the present invention includes a single O-ring 46, while the branch saddle 100 according to an embodiment of the present invention includes two O-rings (the first O-ring 42 and the second O-ring 43). Note that the branch saddle 100 according to the modification includes a closing part 60 provided in the second branch pipe part 30, similar to the branch saddle according to an embodiment of the present invention.

[0053] In addition, within a range not departing from the spirit of the present invention, it is possible to appropriately replace the components in the above-described embodiment with well-known components, and the above-described modifications may be appropriately combined.

[0054] (Supplementary Note) <1>The branch saddle according to one aspect of the present invention includes a saddle portion, a first branch pipe portion protruding from the saddle portion, a second branch pipe portion provided in the middle of the first branch pipe portion, and a closing portion provided in the second branch pipe portion.

[0055] According to the above configuration, a closing portion is connected to the second branch pipe portion. Thereby, when the main pipe is drilled, it is possible to make it difficult for water to leak from the second branch pipe portion of the branch saddle.

[0056] <2>The closing portion of the branch saddle according to <1> above may be made of a plastic resin.

[0057] According to the above configuration, the closing portion of the branch saddle is made of a thermoplastic resin. Thereby, the tip of the closing portion can be easily cut on the actual site where construction is performed. Further, when the second branch pipe portion is also made of a thermoplastic resin, the closing portion can be fused and connected to the second branch pipe portion.

[0058] <3>The closing portion of the branch saddle according to <1> or <2> above is connected in a state where the end portion of the second branch pipe portion and the end portion of the closing portion are butted against each other, and ridge portions may be provided on the inner peripheral surface and the outer peripheral surface at the connection portion between the end portion of the second branch pipe portion and the end portion of the closing portion, respectively.

[0059] According to the above configuration, the end portion of the second branch pipe portion and the end portion of the closing portion are connected in a butted state, and ridge portions are provided on the inner peripheral surface and the outer peripheral surface at the connection portion between the end portion of the second branch pipe portion and the end portion of the closing portion, respectively. Such a second branch pipe portion and closing portion are manufactured by being integrated by fusion. Therefore, the end portion of the second branch pipe portion and the end portion of the closing portion are fused and connected, and by integrating the two, compared to the case where the two are fitted as concave and convex shapes, etc., even when water pressure is applied to the closing portion during construction, work can be performed in a state where water is less likely to leak.

[0060] <4>A joint having a receiving port portion is connected to the closing portion of the branch saddle according to one aspect of <1> or <2> above, and the length of the closing portion may be longer than the length of the receiving port portion of the joint.

[0061] According to the above configuration, the length of the blocking part is longer than the length of the receiving port part of the joint. Therefore, the receiving port part of the joint can be connected to the blocking part.

[0062] <5>The construction method of the branch saddle according to any one of the above <1> to <4> aspects may include a first step of fusing the saddle part to the main pipe, a second step of piercing the main pipe, and a third step of cutting the end of the blocking part after the second step.

[0063] According to the above configuration, the construction method of the branch saddle includes a first step of fusing the saddle part to the main pipe, a second step of piercing the main pipe, and a third step of cutting the end of the blocking part after the second step. Here, at the time of executing the second step, the blocking part is connected to the end of the second branch pipe part. Therefore, while the second step of piercing the main pipe is being executed, it is possible to make it difficult for water to leak from the branch saddle.

Description of reference numerals

[0064] 10 Saddle part 20 First branch pipe part 30 Second branch pipe part 31 Connection end 60 Blocking part 61 Closed end 62 Connection end 63 Inner ridge part 64 Outer ridge part 100 Branch saddle P Main pipe F Joint F1 Receiving port L Cutting line

Claims

1. A saddle part, A first branch pipe part protruding from the saddle part, A second branch pipe part provided in the middle of the first branch pipe part, And a blocking part provided in the second branch pipe part, a branched saddle.

2. The branched saddle according to claim 1, wherein the blocking part is made of a thermoplastic resin.

3. The end of the second branch pipe part and the end of the blocking part are connected in a butted state, Ridge parts are provided on the inner peripheral surface and the outer peripheral surface at the connection part between the end of the second branch pipe part and the end of the blocking part, respectively. The branched saddle according to claim 1 or 2.

4. A joint having a receiving port is connected to the blocking part, The length of the blocking part is longer than the length of the receiving port of the joint. The branched saddle according to claim 1 or 2.

5. A construction method of the branched saddle according to claim 1 or 2, A first step of fusing the saddle part to the main pipe, A second step of piercing the main pipe, A third step of cutting the end of the blocking part after the second step, A construction method of a branched saddle including.

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