JPH0717887U - Pipe fitting - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to provide a pipe joint that can easily cope with crustal movements such as ground subsidence. A pipe joint 17 is composed of a pipe receiving portion 18 and a pipe connecting portion 19, and a concave portion 20 is provided on the outer periphery of the pipe receiving portion 18 so as to receive a pipe connected to the inner periphery. Part 2
1, the outer end portion of the convex portion 21 has a wedge surface 21A.
And

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pipe joint in which a connected pipe can move in the pipe axial direction.

[0002]

[Background of device]

 In the sewer pipe, for example, as shown in FIG. 4, an inspection pipe (2) whose upper end opens to the ground G is connected to the sewage basin (1) from above, and the sewer pipe (3) from the upstream side and the downstream side, (4) is connected, and the downstream side is connected to the sewer main (8) through a 90 ° curved joint (5), a short pipe (6), a sewage joint (7), etc. In the above sewer pipe, when crustal deformation such as ground subsidence occurs, the sewage basin (1) side sinks to the sewer main (8) side, and as a result, the short pipe (6) connected to the Yaritori fitting (7). ) Moves downward with respect to the spear joint (7) as shown by arrow a in FIG. Therefore, the short pipe (6) must be connected to the Yaritori joint (7) so that it can move in the pipe axial direction and absorb external force.

[0003]

[Prior art]

 Conventionally, as shown in FIG. 5, a spacer (9) whose upper surface is a wedge surface (9) A is adhered to the inner wall of the above-mentioned spear joint (7), and the short pipe (6) is shown in FIG. As shown in the arrow B due to the wedge effect of the wedge surface (9) A, the wedge surface (9) A of the spacer (9) is pushed by the short pipe (6) when it moves downward due to ground subsidence, etc. A component is provided in the horizontal direction, and the pipe diameter of this part is slightly enlarged and deformed as shown by the dotted line to allow the short pipe (6) to move slightly downward. Has been done.

[0004]

[Problems to be solved by the device]

 However, in the above conventional structure, since the joint (7) has a double wall structure at the bonding portion of the spacer (9), the wedge effect of the wedge surface (9) A of the spacer (9) causes a horizontal direction. Even if a component force is generated, the pipe diameter at this part is not easily expanded and deformed, and a large force is exerted on the connection part between the joint (7) and the short pipe (6), which may cause breakage at this part. there were. Further, in the above-mentioned conventional structure, post-processing for adhering the spacer (9) to the inner wall of the joint (7) is required.

[0005]

[Means for Solving the Problems]

 As a means for solving the above conventional problems, the present invention has a pipe receiving portion (18) at one end and a pipe connecting portion (19) at the other end, and the pipe receiving portion (18) is By forming a concave portion (20) on the outer circumference, a convex portion (21) is formed on the inner circumference, and the wedge surface (21) A is formed on the outer end portion of the convex portion (21). A characteristic pipe joint (17) is provided.

[0006]

[Action]

 In the pipe joint (17) of the present invention, when the pipe (6) connected to the pipe receiving portion (18) tries to move in the direction of deepening the connection in the pipe axial direction, the pipe (6) The wedge surface (21) A of the wedge surface (21) A is pushed by pressing the wedge surface (21) A of the convex portion (21) formed on the inner circumference by providing the concave portion (20) on the outer periphery of the receiving portion (18). Due to the effect, a component force in a direction perpendicular to the pipe axis direction is generated to deform the pipe receiving part (18) in a direction in which the diameter increases, and due to such fluctuation of the pipe receiving part (18). The tube (6) can move. In the pipe joint (17) of the present invention, the convex portion (21) on the inner periphery of the pipe receiving portion (18) is formed by providing the concave portion (20) on the outer periphery of the pipe receiving portion (18). Since the wall thickness is almost uniform and there is no double wall structure, the pipe receiving part (18) can be easily deformed, and such a pipe joint (17) can be manufactured by integral molding and has a wedge surface. (21) No post processing is required to provide A.

[0007]

【Example】

 The present invention will be described with reference to an embodiment shown in FIGS. 1 to 3. (17) is a pipe joint, which is a pipe receiving portion (18), and a pipe connecting portion (19). , A packing groove (18) A in which a packing ring (18) B is fitted is formed at the outer end of the pipe receiving part (18), and a concave portion is formed on the outer periphery of the pipe receiving part (18). By providing (20), a convex portion (21) is formed on the inner circumference, and a wedge surface (21) A is formed at the outer end portion of the convex portion (21). Therefore, the wall thickness of the pipe joint (17) does not increase at the location of the convex portion (21) and is substantially uniform as a whole.

In the above structure, the short pipe (6) is connected to the pipe receiving portion (18) of the pipe joint (17) from the side of the wastewater basin (1) shown in FIG. 4, and the pipe insertion portion (19) is It is connected to the pipe socket (9) on the sewer main (8) side. Then, when the short pipe (6) tries to move downward along the pipe axis as shown by arrow A in Fig. 3 due to ground subsidence, etc., the wedge surface (21) of the convex portion (21) of the pipe joint (17). A is pushed by the short pipe (6), and the wedge effect of the wedge surface (21) A generates a horizontal component force perpendicular to the pipe axis as shown by the arrow B. As shown in, the diameter fluctuates in the direction of expansion. As mentioned above, the wall thickness of the pipe joint (17) does not increase at the location of the convex portion (21) and is generally uniform, and the above variation is extremely easy, and the short pipe (6) moves in the direction of arrow a. It can move easily.

Therefore, the pipe joint (17) of the present embodiment has an advantage that blow molding can be applied in a short time, but of course, it may be manufactured by injection molding, cast molding or the like. Further, a pipe receiving portion may be provided instead of the pipe insertion portion (19). In this embodiment, the convex portions (21) are provided at four places in the circumferential direction, but the present invention is not limited to this embodiment and may be provided at three places, five places, or the like.

[0010]

[Effect of device]

 Therefore, the pipe connected to the pipe joint of the present invention can easily move along the pipe axial direction, and external force is absorbed by the movement of the pipe, so that the pipe connecting portion is reliably prevented from being broken.

[Brief description of drawings]

 1 to 3 show an embodiment of the present invention.

FIG. 1 is a perspective view.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a sectional view taken along the axis

[Figure 4] Illustration of sewer piping

FIG. 5 is a partial sectional view along the axis of a conventional example.

[Explanation of symbols]

 17 Pipe joint 18 Pipe receiving portion 19 Pipe insertion portion (pipe connecting portion) 20 Recessed portion 21 Convex portion 21A Wedge surface

Claims (1)

[Scope of utility model registration request] 1. A pipe receiving portion is provided at one end, a pipe connecting portion is provided at the other end, and a concave portion is provided on the outer periphery of the pipe receiving portion to form a convex portion on the inner periphery thereof. A pipe joint characterized in that a wedge surface is formed at the outer end of the convex portion.