JP5781460B2 - Branch saddle joint and water stop method - Google Patents

Description

  The present invention relates to a branch saddle joint and a water stop method thereof, and more particularly, to a branch saddle joint and a water stop method thereof that are electrically fused to the outer surface of the main pipe to take out a branch from the main pipe, for example.

  An example of a conventional branch saddle joint of this type is disclosed in Patent Document 1.

In the branch saddle joint (branch joint) of Patent Document 1, a seal plug for preventing the inflow of tap water from the water main pipe (main pipe) side to the branch pipe part side is built in the branch cylinder part. The seal plug has a male screw portion and a seal portion extending from the end surface of the male screw portion with a reduced diameter, and an O-ring is attached to a circumferential groove formed on the peripheral surface of the seal portion. . Then, by screwing the seal plug to the water main side, the O-ring is brought into close contact with the inner peripheral surface of the opening communicating with the water main, so that the gap between the opening and the seal portion is water-tightly closed.
JP 2008-180373 [F16L 41/06]

  However, in the technique of Patent Document 1, when there is a large amount of water flowing from the water main to the branch pipe, or when the water pressure in the water main is high, the gap between the opening and the seal is Even if there is anxiety about the water stop performance, it is not possible to improve the water stop performance of the O-ring on the spot by tightening the seal plug, etc., and respond to the situation of running water in the water main.

  Similarly, even if the O-ring's restoring force is reduced after water stoppage and the water stop performance is reduced, the water stop performance of the O-ring cannot be recovered by tightening the seal plug. It is difficult to maintain the water stop performance over a long period of time.

  Therefore, a main object of the present invention is to provide a novel branch saddle joint and a water stop method thereof.

  Another object of the present invention is to provide a branched saddle joint and a water stop method thereof that can maintain stable water stop performance over a long period of time.

  The present invention employs the following configuration in order to solve the above problems. Note that reference numerals in parentheses, supplementary explanations, and the like indicate correspondence relationships with embodiments described later to help understanding of the present invention, and do not limit the present invention in any way.

  1st invention rises from the peripheral part of the saddle part in which the branch hole was formed in the branch saddle joint electrofused and joined to the outer surface of the main pipe in order to take out the branch from the main pipe made of synthetic resin A short tubular branch part, a female screw part formed on the inner surface of the branch part, a seat made of a first resin and projecting inward from the female screw part below the female screw part, and a contact that contacts the seat part And a male screw part that is screwed into the female screw part, and is provided with a water stop member that is movably provided inside the branch part by screwing of the male screw part and the female screw part. It was made of a hard material, and the water flowing in from the main pipe was stopped between the crushed seat and the contact part by lowering the water stop member and pressing the contact part. It is a branch saddle joint.

  In the first invention, the branch saddle joint (10) is electrofused to the outer surface of the main pipe to take out the branch from the main pipe (100). In the saddle portion (14) of the branch saddle joint, a short tubular branch portion (20) rising toward the radially outer side of the saddle portion is formed at the peripheral edge portion of the branch hole (16). A female screw part (28) is formed over the entire inner peripheral surface of the branch part, and a seat part (30) is formed below the female screw part. For example, the seat portion is formed of the first resin and has a shape protruding inward from the inner surface of the branch portion. A water stop member (12) that can move in the axial direction in the branch portion by screwing with the female screw portion is provided inside the branch portion. The water stop member is used to prevent the inflow of water from the main pipe side to the branch saddle joint side, and the main body (34) has a contact portion (38) made of a material harder than the first resin. Is formed. Such a water stop member is lowered until the contact portion is locked to the seat portion, and further lowered from the contact portion, thereby pressing the contact portion against the seat portion. Then, since the contact portion is formed of a material harder than the seat portion, the seat portion pressed against the contact portion is crushed, and the crushed seat portion is deformed into a shape suitable for the contact portion. . As a result, the abutment portion of the water stop member and the seat portion are brought into tight contact with each other, so that the gap between the main body of the water stop member and the seat portion is watertightly closed, and the branch saddle is closed from the main pipe side. Tap water flowing into the joint side is stopped.

  According to the first invention, since the water stop member can be appropriately tightened according to the amount of tap water in the main pipe, the water pressure, etc., stable water stop performance can be exhibited.

  Further, even when the water stop performance is deteriorated, the water stop performance can be recovered by tightening the water stop member, so that the water stop performance can be maintained for a long time.

  A second invention is according to the first invention, wherein the seat portion has a corner portion formed so as to face the contact portion, and the corner portion and the contact portion crushed by pressing the contact portion. The water was stopped between.

  In the second invention, the seat portion (30) is formed, for example, so as to protrude from the inner surface of the branch portion (20) in a step-down manner, and has a corner portion (32) at the inner peripheral edge of the upper end. A corner | angular part is formed so that it may face the contact part (38) of a water stop member (12). In this branch saddle joint (10), at the time of water stoppage, the contact portion of the water stop member is pressed against the corner portion of the seat portion, and the collapsed corner portion is deformed along the contact portion. As a result, the contact portion of the water stop member and the corner portion of the seat portion are firmly adhered to each other, so that the gap between the contact portion of the water stop member and the seat portion is closed in a watertight manner. Tap water flowing from the pipe (100) side to the branch saddle joint side is stopped.

  A third invention is dependent on the first invention, the contact portion has a first inclined surface whose diameter is reduced downward, and the seat portion is inclined with a smaller gradient than the first inclined surface. There are two inclined surfaces, and the second inclined surface is crushed along the first inclined surface by pressing the first inclined surface, and water is stopped between the second inclined surface and the first inclined surface. did.

  In 3rd invention, the contact part (38) of the water stop member (36) has the inclined surface (40) diameter-reduced below in the lower end part. In addition, the seat (30) is formed, for example, so as to protrude from the inner surface of the branching portion in a step-down manner, and has an inclined surface (44) at the inner peripheral edge of the upper end. In this bifurcated saddle joint, when the water stops, the inclined surface of the contact portion of the water stop member is pressed against the inclined surface of the seat portion, and the collapsed inclined surface is inclined with substantially the same gradient as the inclined surface of the contact portion. To deform. As a result, the inclined surface of the contact portion of the water-stopping member and the inclined surface of the seat portion are firmly adhered to each other, so that the gap between the contact portion of the water-stopping member and the seat portion is closed in a watertight manner. The tap water flowing from the pipe (100) side to the branch saddle joint (10) side is stopped.

  A fourth invention is dependent on the first invention, the contact portion has a convex portion formed so as to face the seat portion, and the seat portion collapsed by pressing the convex portion of the contact portion; Water was stopped between the convex parts.

  In 4th invention, the contact part (38) of the water stop member (12) has a convex part (46) in the lower end peripheral part, for example. For example, the convex portion is formed so as to face the seat portion (30). In this branch saddle joint (10), at the time of water stop, the convex part of the contact part of the water stop member is pressed against the seat part and crushed, and the convex part is bitten into the seat part. As a result, the convex portion of the contact portion of the water stop member and the seat portion are firmly in close contact with each other, so that the gap between the contact portion of the water stop member and the seat portion is watertightly closed, and the main pipe (100 The tap water flowing from the) side to the branch saddle joint side is stopped.

  5th invention is the water stop method of the branch saddle joint of any one of 1st thru | or 4th invention, Comprising: (a) The step of carrying out the electrofusion joining of the branch saddle joint to the outer surface of a main pipe, (b) Male thread (C) a step of lowering the water-stopping member inside the branch portion by screwing between the female screw portion and the female screw portion; and (c) engaging the contact portion of the water-stopping member lowered inside the branch portion in step (b) with the seat portion. (D) Step (c) After step (c), by further lowering the water stop member, the abutment portion crushes and deforms the seat portion, and flows from the main pipe between the seat portion and the main body. A water stopping method for a branch saddle joint including a step of water stopping.

  In the fifth invention, in step (a), the branch saddle joint (10) is electro-welded to the outer surface of the main pipe (100). In step (b), for example, the rotating tool inserted into the rotating tool engaging portion (44) of the main body (34) of the branch saddle joint is rotated, thereby rotating the male screw portion (36) and the female screw portion (28). And the water stop member (12) is lowered in the branch portion (20). In step (c), the contact portion (38) of the water stop member lowered in the branch portion is brought into contact with the seat portion (30) to be locked. In step (d), the water stop member is further lowered and the contact portion is pressed against the seat portion, whereby the seat portion is crushed and deformed. As a result, the abutting portion and the seat portion of the water-stopping member are firmly adhered to each other, so that the gap between the abutting portion and the seat portion of the water-stopping member is closed in a watertight manner, and the branch saddle joint is connected from the main pipe side. The tap water flowing to the side is stopped.

  According to the fifth aspect, the same effect as the first aspect is achieved.

  According to the present invention, the contact portion of the water stop member is pressed against the seat portion formed of a softer resin and crushed, and the water stop is performed between the crushed and deformed seat portion. Therefore, the water stop member can be appropriately tightened according to the amount of water in the main pipe, the water pressure, and the like. Therefore, stable water stopping performance can be maintained over a long period.

  The above object, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

It is an illustration figure which shows a mode that the branch saddle joint of one Example of this invention was attached to the main pipe. It is the elements on larger scale which show the principal part of the water stop structure of the branch saddle joint of FIG. It is sectional drawing which shows the branch part of FIG. It is sectional drawing which shows the water stop member of FIG. It is an illustration figure which shows a mode that the water stop member of FIG. 1 is moved within a branch part, (a) shows the position of the water stop member at the time of normal, (b) is the position of the water stop member at the time of water stop Indicates. (A) is an illustration figure which shows a mode that the contact part of the water stop member was latched to the seat part, (b) is a seat part by pressing the contact part of a water stop member against a seat part. It is an illustration figure which shows a mode that was crushed and changed. It is sectional drawing which shows the branch saddle joint of other Examples of this invention. (A) is an illustration figure which shows a mode that the contact part of the water stop member was latched by the seat part in the branch saddle joint of FIG. 7, (b) is a seat part. It is an illustration figure which shows a mode that the seat part was crushed and deformed by pressing on. It is sectional drawing which shows the branch saddle joint of other Example of this invention. It is sectional drawing which shows the water stop member of FIG. (A) is an illustration figure which shows a mode that the contact part of the water stop member was latched to the seat part in the branch saddle joint of FIG. 9, (b) is a seat part. It is an illustration figure which shows a mode that the seat part was crushed and deformed by pressing on.

  Referring to FIG. 1, a branch saddle joint 10 according to one embodiment of the present invention is electrically fused on the outer surface of a main pipe 100 in order to take out a branch from the main pipe 100 made of a heat-sealable synthetic resin such as polyethylene. It is to be worn. The branch saddle joint 10 incorporates a water stop member 12 for preventing the tap water from flowing into the branch saddle joint 10 from the main pipe 100 side (that is, stopping water).

  In this embodiment, the main pipe 100 is a tap water distribution pipe, and its pipe diameter is, for example, 65 mm.

  First, the outline of the branch saddle joint 10 will be described. As shown in FIGS. 1 and 2, the branch saddle joint 10 includes a saddle portion 14 that is formed to be curved along the tube wall of the main pipe 100.

  The saddle portion 14 is formed of the same type of heat-sealable synthetic resin as the main pipe 100, which is polyethylene in this embodiment. The saddle portion 14 is a plate-like body having the same inner diameter curvature as the outer diameter curvature of the main pipe 100, and a branch hole 16 having a substantially true circular shape in plan view is formed at the center thereof. As an example, the length of the saddle portion 14 in the axial direction (the pipe axis direction of the main pipe 100) is 160 mm, and the thickness thereof is 6 mm.

  On the back surface side of the saddle portion 14, that is, on the joint surface side with the main pipe 100, a heating wire 18 arranged in an arbitrary shape such as a spiral shape or a twisted shape around the branch hole 16 is provided. Both ends of the heating wire 18 are connected to a power connection terminal (not shown) formed so as to protrude from the surface of the saddle portion 14, and this power connection terminal is connected to a power source so that a current flows through the heating wire 18. As a result, the joint surface between the saddle portion 14 and the main pipe 100 is melted.

  In addition, a short tubular branch portion 20 that rises toward the outer side in the radial direction of the saddle portion 14 (that is, the upper side in FIG. 1) is formed at the peripheral edge portion of the branch hole 16. A short tubular branch pipe connection portion 22 projecting sideways is formed on the outer surface of the branch portion 20, and the branch pipe 102 is connected to the branch pipe connection portion 22 via a joint or the like. A male screw part 24 is formed on the outer surface of the branch part 20. A cap 26 that seals the upper end of the branch portion 20 is attached to the male screw portion 24.

  Further, as shown in FIGS. 2 and 3, an internal thread portion 28 is formed on the entire inner peripheral surface of the branch portion 20. A seat portion 30 is formed below the female screw portion 28 continuously from the lower end of the female screw portion 28.

  The seat portion 30 is formed to protrude from the inner surface of the branch portion 20, and is formed of the same resin as that of the branch portion 20 (or the saddle 12), that is, polyethylene in this embodiment. The seat portion 30 protrudes inward from the female screw portion 28 and functions as a stopper for the above-described water-stopping member 12 when the tap water is stopped from the main pipe 100 side. It is also used as a part for stopping tap water.

  For example, in this embodiment, the seat portion 30 is formed so as to protrude from the inner surface of the branch portion 20 in a step-down manner, and has a corner portion 32 at the inner peripheral edge of the upper end. The corner portion 32 is formed so as to face a contact portion 38 (inclined surface 40) of the water-stopping member 12 described later (that is, the corner portion 32 becomes sharp toward the inclined surface 40). The dimension of the seat part 30 is appropriately set according to the size of the branch part 20 and the water stop member 12. As an example, in this embodiment, the seat portion 30 protrudes inward by about 3 mm from the innermost side of the female screw portion 28, and its axial length is 4 mm.

  In addition, the water stop member 12 described above is provided in the branch portion 20 so as to be movable in the axial direction (the axial direction of the branch portion 20) by screwing with the female screw portion 28.

  As shown in FIGS. 2 and 4, the water stop member 12 includes a synthetic resin main body 34, and the main body 34 is formed in a columnar shape. The main body 34 is made of synthetic resin, and specifically, polyacetal (POM), polycarbonate (PC), fiber reinforced plastic such as glass fiber reinforced plastic (GFRP) and carbon fiber reinforced plastic (CFRP), and the like, It is formed of a synthetic resin made of a material having mechanical strength or hardness that can withstand a load applied when the tap water from the main pipe 100 is stopped, and is harder than the seat portion 30. For example, in this embodiment, the main body 34 is formed by POM in consideration of material cost, formability, and the like.

  A male screw portion 36 corresponding to the female screw portion 28 is formed on the outer peripheral surface of the main body 34. Then, the male screw portion 36 is screwed with the female screw portion 28, so that the water stop member 12 moves in the branch portion 20 in the axial direction.

  A contact portion 38 is formed on the periphery of the lower end portion of the main body 34. The abutting portion 38 is a portion that abuts against the seat portion 30 described above when the tap water from the main pipe 100 side is stopped. In this embodiment, the abutting portion 38 has an inclined surface 40 that decreases in diameter downward. Yes. The inclined surface 40 is formed from the outer peripheral surface of the main body 34 to the lower end surface, the inclination angle thereof is, for example, 45 °, and the length thereof is, for example, 4 mm.

  Furthermore, a rotary tool engaging portion 42 such as a hexagonal hole that engages with a rotary tool (not shown) is formed at the upper end of the main body 34. And if the main body 34 is rotated using a rotary tool, the water stop member 12 will move the inside of the branch part 20 to an axial direction by the screwing of the internal thread part 28 and the external thread part 36. FIG.

  Such a water stop member 12 is normally disposed above the branch pipe connection portion 22 in the branch portion 20 as shown in FIG. 5A, but the branch pipe connection portion 22 of the branch saddle joint 10. When the tap water flowing from the main pipe 100 side to the branch saddle joint 10 side is stopped, such as when the branch pipe 102 connected to the pipe is no longer used, as shown in FIG. Until it is locked (ie, screwed downward).

  Hereinafter, a method for stopping tap water flowing from the main pipe 100 side to the branch saddle joint 10 side (that is, constructing a water stop structure) will be described with reference to FIGS. 5 and 6.

  First, as shown in FIG. 5A, the cap 26 is removed from the branch portion 20 of the branch saddle joint 10 that is electro-fused to the outer surface of the main pipe 100. Subsequently, an end portion of a rotating tool (not shown) is inserted from the upper end opening of the branch portion 20, and the rotating tool is inserted into the rotating tool engaging portion 42 of the main body 34. Then, the water stop member 12 is lowered as shown in FIG. 5B by rotating the main body 34 with a rotating tool.

  Then, as shown in FIG. 6A, the water stop member 12 is lowered until the inclined surface 40 (of the contact portion 38) of the main body 34 comes into contact with and is locked with the seat portion 30. Then, the water stop member 12 is further lowered to press the inclined surface 40 of the main body 34 against the corner portion 32 of the seat portion 30.

  Then, since the main body 34 (the contact portion 38) of the water stop member 12 is formed of a material (synthetic resin) harder than the seat portion 30, as shown in FIG. The inclined surface 40 of the twelve main bodies 34 descends downward while crushing the corner portion 32 of the seat portion 30, and the crushed corner portion 32 is deformed into a flat shape along the inclined surface 40.

  And since the inclined surface 40 of the main body 34 of the water stop member 12 and the corner | angular part 32 of the seat part 30 are closely_contact | adhered by this, the main body 34 of the water stop member 12 and the corner | angular part 32 of the seat part 30 are closely_contact | adhered. The gap is watertightly closed, and the tap water flowing from the main pipe 100 side to the branch saddle joint 10 side is stopped.

  As described above, in this embodiment, when the tap water flowing from the main pipe 100 side to the branch saddle joint 10 side is stopped, the contact portion 38 of the water stop member 12 lowered in the branch portion 20 is provided. By pressing against the seat portion 30 and crushing the seat portion 30 and deforming the collapsed seat portion 30 into a shape along the abutment portion 38, the abutment portion 38 and the seat portion 30 of the water stop member 12 are firmly connected. The gap between the two is closed.

  For this reason, the water stop performance can be improved by further lowering (that is, tightening) the water stop member 12 once pressed against the seat portion 30. Therefore, even when there is a large amount of water flowing from the main pipe 100 side to the branch saddle joint 10 side or when the water pressure in the main pipe 100 is high, the water stop member 12 is tightened accordingly. By improving the water stop performance, it is possible to reliably stop the tap water flowing from the main pipe 100 side to the branch saddle joint 10 side.

  That is, according to this embodiment, the water stop member 12 can be appropriately tightened according to the amount of tap water or the water pressure in the main pipe 100, so that stable water stop performance can be exhibited. .

  Further, in this embodiment, even if the water stop performance is lowered due to loosening of the screwing of the water stop member 12 after the water stop, the water stop performance is increased by tightening the water stop member 12 by that amount. It is possible to recover. Therefore, according to this embodiment, it is possible to maintain the water stopping performance for a long time.

  In the above-described embodiment, the inclined surface 40 of the main body 34 of the water blocking member 12 is pressed against the seat portion 30 to crush the corner portion 32, and the crushed corner portion 32 is flat along the inclined surface 40 of the main body 34. Although the water stop was performed between the main body 34 of the water stop member 12 and the seat portion 30 by being deformed into a proper shape, it is not necessary to be limited to this. If the seat portion 30 protrudes inward from the female screw portion 28 and the abutting portion 38 of the main body 34 can be pressed against the seat portion 30 when the water blocking member 12 is lowered, the contact of the main body 34 is reduced. Any shape can be adopted for the contact portion 38 and the seat portion 30.

  For example, in another embodiment of the present invention shown in FIG. 7, the seat portion 30 formed on the inner surface of the branch portion 20 is an inclined surface corresponding to the inclined surface 40 of the abutting portion 38 of the main body 34 of the water stop member 12. 44.

  As shown in FIGS. 7 and 8A, a seat portion 30 is formed on the inner surface of the branch portion 20 of the branch saddle joint 10 continuously from the lower end of the female screw portion 28. The seat portion 30 protrudes inward from the female screw portion 28, and is formed of the same resin as that of the branch portion 20, that is, polyethylene in this embodiment. For example, in this embodiment, the seat portion 30 is formed to protrude from the inner surface of the branching portion 20 in a step-down (or stepped) shape, and an inclined surface 44 whose diameter is reduced downward is formed on the inner peripheral edge of the upper end. Have. The inclined surface 44 is inclined with a smaller gradient (inclination angle) than the inclined surface 40 of the main body 34, the inclination angle is, for example, 30 °, and the length thereof is, for example, 3 mm.

  When the tap water flowing into the branch saddle joint 10 from the main pipe 100 side is stopped (that is, a water stop structure is constructed), first, the rotation inserted into the rotary tool engaging portion 42 of the main body 34 is inserted. By rotating the tool, the water stop member 12 is lowered in the branch portion 20. Then, as shown in FIG. 8A, the water stop member 12 is lowered until the inclined surface 40 of the main body 34 comes into contact with and is engaged with the inclined surface 44 of the seat portion 30. Then, by further lowering the water stop member 12, the inclined surface 40 of the main body 34 is pressed against the inclined surface 44 of the seat portion 30.

  Then, the inclined surface 40 of the main body 34 is formed as shown in FIG. 8B by forming the main body 34 (the contact portion 38 thereof) of the water stop member 12 with a synthetic resin harder than the seat portion 30. Is lowered downward while crushing the inclined surface 44 of the seat portion 30, and the crushed inclined surface 44 is inclined along the inclined surface 40 of the main body 34, that is, with an inclination substantially equal to the inclined surface 40 of the main body 34. Transforms into

  As a result, the inclined surface 40 of the main body 34 of the water stop member 12 and the inclined surface 44 of the seat portion 30 are firmly adhered to each other. The gap is watertightly closed, and the tap water flowing from the main pipe 100 side to the branch saddle joint 10 side is stopped.

  Also in this embodiment, as in the embodiment of FIG. 1, stable water stop performance can be exhibited, and the water stop performance can be maintained for a long time.

  Further, for example, in still another embodiment of the present invention shown in FIG. 9, a convex portion 46 and a concave portion 48 are formed at the lower end portion of the main body 34 of the water stop member 12.

  As shown in FIG. 9, a seat portion 30 is formed on the inner surface of the branch portion 20 of the branch saddle joint 10 continuously from the lower end of the female screw portion 28. The seat portion 30 is formed so as to protrude from the inner surface of the branch portion 20 in a step-down shape that is forwardly lowered, and is formed of the same resin as the branch portion 20, that is, polyethylene. As an example, the seat portion 30 protrudes inward by about 1.2 mm from the innermost side of the female screw portion 28, and its axial length is 4 m.

  On the other hand, as shown in FIG. 10, the contact portion 38 of the main body 34 of the water stop member 12 has a convex portion 46 and a concave portion 48. Specifically, a convex portion 46 protruding toward the seat portion 30 is formed on the periphery of the lower end portion of the main body 34. The convex portion 46 has a substantially triangular cross section that sharpens downward, and its tip angle is, for example, 75 °. For example, the convex portion 46 is formed so that the outer surface thereof is integrated with the side surface (outer peripheral surface) of the main body 34, and is formed continuously over the entire circumference in the circumferential direction of the main body 34. The convex portion 46 may be formed in a so-called single-edged shape in which one of the inner surface side or the outer surface side is tapered, or may be formed in a so-called double-edged shape in which both are tapered. In addition, a concave portion 48 that is recessed upward is formed inside the convex portion 46. The concave portion 48 is formed so that the outer surface thereof is integrated with the inner surface of the convex portion 46, and is continuously formed over the entire circumference of the main body 34.

  When the tap water flowing into the branch saddle joint 10 from the main pipe 100 side is stopped (that is, a water stop structure is constructed), first, the rotation inserted into the rotary tool engaging portion 42 of the main body 34 is inserted. By rotating the tool, the water stop member 12 is lowered in the branch portion 20. Then, as shown in FIG. 11A, the water stop member 12 is lowered until the convex portion 46 of the main body 34 comes into contact with the upper surface of the seat portion 30 and is locked. Then, the water stop member 12 is further lowered to press the convex portion 46 of the main body 34 against the seat portion 30 (the upper surface thereof).

  Then, since the contact portion 38 of the main body 34 of the water stop member 12 is formed of a synthetic resin harder than the seat portion 30, the convex portion 46 of the main body 34 of the water stop member 12 is crushing the seat portion 30. As shown in FIG. 11 (b), the convex portion 46 bites into the seat portion 30, and a part of the seat portion 30 pushed inwardly enters the concave portion 48.

  As a result, the convex portion 46 and the concave portion 48 of the main body 34 of the water-stopping member 12 and the seat portion 30 are firmly adhered, so that the gap between the main body 34 of the water-stopping member 12 and the seat portion 30 is watertight. The tap water that is blocked and flows from the main pipe 100 side to the branch saddle joint 10 side is stopped.

  Also in this embodiment, as in the embodiment of FIG. 1, stable water stop performance can be exhibited, and the water stop performance can be maintained for a longer period.

  However, in this embodiment, water is stopped between the convex portion 46 and the concave portion 48 of the main body 34 of the water stop member 12 and the seat portion 30, but the contact portion of the main body 34 of the water stop member 12 is not necessarily provided. 38 does not need to have the convex portion 46 and the concave portion 48, and the convex portion 46 is formed at least on the main body 34 of the water-stopping member 12, and the convex portion 46 is pressed against the seat portion 30 to be bitten. In this case, it is possible to stop the water.

  In each of the above-described embodiments, the seat portion 30 made of polyethylene is formed on the inner surface of the branch portion 20, and the entire main body 34 of the water blocking member 12 is formed of POM that is harder than polyethylene. It is not necessary to be limited to this.

  For example, the main pipe 100 and the branch saddle joint 10 are not necessarily formed of polyethylene, and the main pipe 100 and the branch saddle joint 10 may be formed of other synthetic resins such as polypropylene. In short, the main pipe 100 and the branch saddle joint 10 may be made of the same synthetic resin.

  Further, for example, it is not always necessary to integrally form the seat portion 30 on the inner surface of the branch portion 20, and the seat portion 30 made of a synthetic resin different from the branch portion 20 is formed on the inner surface of the branch portion 20. You may make it attach with etc.

  Furthermore, it is not always necessary to form the entire main body 34 of the water stop member 12 with a synthetic resin harder than the synthetic resin forming the seat portion 30.

  For example, if at least the contact portion 38 (that is, the portion that contacts the seat portion 30) of the main body 34 of the water stop member 12 is formed of a material harder than the synthetic resin forming the seat portion 30, The part other than the contact part 38 may be formed of an arbitrary material, and the contact part 38 and the part other than the contact part 38 may be formed separately.

  Further, in each of the above-described embodiments, the water stop member 12 is lowered and the contact portion 38 of the main body 34 is pressed against the seat portion 30 to stop the water stop between the seat portion 30 that has been crushed and deformed. However, the present invention is not limited to this.

  For example, the metal seat 30 is attached to the inner surface of the branch portion 20 with a water-tight adhesive or the like, and the abutting portion 38 of the main body 34 made of POM is pressed against the seat 30 and brought into close contact therewith. The tap water flowing from the main pipe 100 side to the branch saddle joint 10 side may be stopped.

  In addition, for example, in the embodiment of FIG. 1, the inclined surface 40 of the main body 34 of the water stop member 12 is simply pressed against the corner portion 32 of the seat portion 30 to be brought into close contact with the main body 34 of the water stop member 12 and the step portion. The tap water flowing from the main pipe 100 side to the branch saddle joint 10 side may be stopped by watertightly closing the gap with the water pipe 32.

  Similarly, in the embodiment of FIG. 7, the inclined surface 44 of the seat portion 30 is inclined with substantially the same gradient as that of the inclined surface 40 of the main body 34, and the inclined surface 40 of the main body 34 is pressed against the inclined surface 40. By doing so, the gap between the inclined surface 40 of the main body 34 of the water stop member 12 and the inclined surface 44 of the seat portion 30 is closed in a watertight manner, so that tap water flowing from the main pipe 100 side to the branch saddle joint 10 side is supplied. You may make it stop water.

  Furthermore, in each of the above-described embodiments, the water stop member 12 is used for the branch saddle joint 10. However, the water stop member 12 can be used for a branch joint other than the branch saddle joint 10.

  In addition, the specific numerical values such as the dimensions given above are merely examples, and can be appropriately changed according to necessity such as product specifications.

DESCRIPTION OF SYMBOLS 10 ... Branch saddle joint 12 ... Water stop member 14 ... Saddle part 16 ... Branch hole 20 ... Branch part 22 ... Branch pipe connection part 28 ... Screw part 30 ... Seat part 32 ... Corner | angular part 34 ... Main body 38 ... Contact part 40 ... Inclined surface 44 ... Inclined surface 46 ... Convex part 48 ... Concave part 100 ... Main pipe

Claims (5)

In a branch saddle joint that is electrofused to the outer surface of the main pipe to take out a branch from the main pipe made of synthetic resin,
Saddle part with branch holes formed,
A short tubular branch rising from the peripheral edge of the branch hole;
An internal thread formed on the inner surface of the branch part;
A seat portion made of a first resin and projecting inward from the female screw portion below the female screw portion, and a contact portion that comes into contact with the seat portion and a male screw portion that is screwed into the female screw portion. And a water stop member provided movably inside the branch portion by screwing between the male screw portion and the female screw portion,
The contact portion is formed of a material harder than the first resin, and the book is between the contact portion and the seat portion crushed by lowering the water stop member and pressing the contact portion. A branch saddle joint characterized in that water flowing in from a pipe is stopped. The seat portion has a corner portion formed to face the contact portion,
The branch saddle joint according to claim 1, wherein water is stopped between the corner portion crushed by pressing the contact portion and the contact portion. The contact portion has a first inclined surface that decreases in diameter downward.
The seat has a second inclined surface that is inclined with a smaller gradient than the first inclined surface;
The second inclined surface is crushed along the first inclined surface by pressing the first inclined surface, and water is stopped between the second inclined surface and the first inclined surface. Item 2. The branch saddle joint according to item 1. The abutting part has a convex part formed to face the seat part,
The branch saddle joint according to claim 1, wherein water is stopped between the crushed seat portion and the convex portion by pressing the convex portion of the abutting portion. A water stopping method for a branch saddle joint according to any one of claims 1 to 4,
(A) a step of electrofusion bonding the branch saddle joint to the outer surface of the main pipe;
(B) a step of lowering the water stop member inside the branch portion by screwing the male screw portion and the female screw portion;
(C) The step of locking the contact portion of the water stop member lowered in the branch portion in the step (b) to the seat portion,
(D) After the step (c), by further lowering the water stop member, the seat portion is crushed and deformed by the contact portion, and the main pipe is removed from the seat portion and the main body. A water stopping method for a branch saddle joint, including a step of stopping water flowing in.

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