JP2546396Y2 - Manhole pipe joint structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manhole pipe joint structure for connecting a drainage pipe or a sewer pipe made of synthetic resin or the like to a manhole.

[0002]

2. Description of the Related Art Conventionally, a pipe joint structure of a manhole for connecting a drain pipe or a sewer pipe made of synthetic resin or the like to a manhole has conventionally been provided with a socket for joining with a pipe at one end, and at the other end. Insert a short pipe with sand that has been sanded on the outer surface to improve adhesion with cement mortar into a pipe joining hole that opens on the side wall of the manhole, and connect the pipe joining hole with the short pipe with sand. A cement mortar is filled in the gap to fix and stop water, and a saddle-shaped joint J as shown in FIG. 2 in which a flange b is integrally attached to a short pipe a with sand similar to the above. After the sanded end of the short pipe b is inserted into the pipe joining hole with the flange a of the joint J applied to the outer wall surface of the manhole, the cement mortar is packed and fixed in the same manner as described above. Epoxy or the like that mixes a main agent and a curing agent around part a Those to fix and water stop are performed by thickly applying a special bonding agent.

[0003] However, in the case of the above-mentioned joints by the so-called wet method, the adjustment and application of the cement mortar and the bonding agent are complicated and require a long working time, require skill, and the cement mortar and the bonding agent are hardened. Therefore, there is a problem in the construction of the joint, such as the need to wait for the joining operation of the pipes and the time required for curing.

Furthermore, in the case of the above-mentioned conventional joints, it is difficult to obtain sufficient joint strength by cement mortar or a cement, and stress applied when connecting a pipe to the joint, earth pressure after laying, wheel pressure, etc. These joints may be damaged due to uneven settlement of the ground, etc., and the water stopping property may be lost.

[0005]

Therefore, in order to solve the problem of the joint by the above-mentioned wet method, a structure of a joint without using a cement mortar or a bonding agent is described as a short tube with a flanged short tube from the inside of a manhole. A joint structure was considered in which a saddle member was externally fitted to a short tube portion that came out of the manhole, and a nut was screwed and fastened to a male screw engraved on the short tube portion.

However, when there is no detent means for preventing rotation between the short tube with flange and the saddle member,
Even if the saddle member is properly held on the outer wall surface of the manhole, the flanged short pipe rotates together with the nut due to the friction of the screw part when tightening the nut into the male screw engraved on the flanged short pipe. In some cases, tightening may not be possible. Also, the flange of the short tube with a flange is inclined with respect to the inner surface of the manhole,
A phenomenon in which the elastic seal ring between the inner wall surface of the manhole and the flange of the saddle member is not evenly compressed, the elastic seal ring moves or twists, and as a result, good water stopping performance cannot be obtained. It may be.

Further, in order to prevent corotation, it is necessary to support the short tube with a flange from the inside of the manhole by hand, which makes the operation difficult.

The present invention has been made in view of the above-mentioned problems, and is simple in construction, does not require skill, and has no waste or delay in waiting for the hardening of cement mortar, bonding agent, and the like. Further, it is an object of the present invention to provide a manhole pipe joint structure having high water stoppage reliability over a long period of time.

[0009]

In order to achieve the above-mentioned object, a manhole pipe joint structure of the present invention has a male screw engraved on an outer surface at one end, and a pipe joint receiving hole is formed on an inner surface. At the other end, a flanged short pipe with a flange abutting on the inner wall surface of the manhole, a nut engraved with a female screw to be screwed with the male screw of the flanged short pipe, on the outer wall surface of the manhole The saddle member has a hole through which a short tube portion of the short tube with a flange can be inserted, and a boss portion having a flat surface that comes into contact with a nut protrudes from the short tube with the flange. A rotation preventing means for preventing rotation between them, an elastic seal ring sandwiched between an inner wall surface of the manhole and the flange of the short tube with a flange, and a manhole inner wall surface formed in a pipe joining hole opened in the manhole wall. The short tube part of the short tube with flange is inserted from the side The saddle member is externally fitted to the protruding portion of the flanged short tube via the rotation preventing means, and a nut is screwed and fastened to the male screw portion, so that the manhole and the flange of the flanged short tube are protruded. The gist is that the elastic seal ring is compressed.

As a detent means for preventing rotation between the flanged short tube and the saddle member, a key or a wedge is inserted between the flanged short tube and the saddle member. And fitting with a groove and a protrusion fitted into the groove.

[0011]

According to the present invention, a short tube with a flange is inserted from the inside of the manhole into a tube joining hole opened in the manhole wall, and a nut is screwed and fastened to the short tube protruding to the outside of the manhole. The flange of the member and the flange of the flanged short pipe are firmly fixed to the manhole wall, and the elastic seal ring surrounding the opened pipe joining hole is compressed between the manhole wall and the flange of the flanged short pipe. Good water stoppage is obtained.

Further, in the present invention, since the short pipe with the collar and the saddle member are provided with a detent means for preventing rotation therebetween, the short pipe with the collar is properly held on the outer surface of the manhole. The saddle member is always kept parallel and correct without rotating relative to the saddle member.As a result, the elastic seal ring between the inner surface of the manhole and the saddle member does not shift or twist, and , Is uniformly compressed over the entire circumference.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory view showing a manhole pipe joint having a circular horizontal cross section for joining a rigid vinyl chloride drainage pipe.

In FIG. 1, a short tube 1 with a flange is provided with a male screw T on an outer surface at one end thereof, and an annular groove formed on an inner surface thereof. Are fitted to form a socket S for pipe joining. A flange 2 is integrally formed and attached to the other end of the short tube 1 with a flange, and an outer surface 21 of the flange 2 is formed into a cylindrical surface having substantially the same curvature as the inner wall surface of the manhole M. I have.

A nut 3 provided with a female screw to be screwed with the male screw T is screwed into the flanged short pipe 1.

The saddle member 4 comprises a flange 5 and a boss 6 projecting from the outer surface thereof. The inner surface 51 of the flange 5 is formed into a cylindrical surface having substantially the same curvature as the outer wall surface of the manhole M. The boss 6 has an opening through which a male screw T carved end of the flanged short tube 1 can be inserted, and an end face 61 that abuts on the nut 3.
Are formed flat.

A longitudinal groove 7 (four places in this embodiment) is formed in the external thread T portion on the outer surface of the flanged short tube 1 in the axial direction of the short tube 1 and the inner surface of the saddle member 4. Are formed with projections 8 that fit into the vertical grooves 7.
The protrusions 8 are fitted to each other to form a rotation preventing means for preventing rotation between the short tube with flange 1 and the saddle member 4.

Further, an elastic seal ring 9 is disposed between the inner wall surface of the manhole M and the flange 2 of the short tube 1 with a flange so as to surround the pipe joining hole H opened in the manhole wall.

The procedure for forming the pipe joint in the manhole M is as follows.

The seal ring 9 is arranged on the outer surface 21 of the flange 2 of the flanged short pipe 1 so as to securely surround the pipe joining hole H,
Temporarily fix it with an appropriate method such as an adhesive tape so as not to move easily, and insert the short pipe part from the inside of the manhole M into the pipe joining hole H to project outside the manhole M. Next, the saddle member 4 is inserted into the outer surface of the flanged short tube 1 by fitting the vertical groove 7 and the projection 8 into each other, and the inner surface 51 of the flange 5 is set in a state where both axes of the flange 5 and the manhole M are parallel. Is held on the outer wall surface of the manhole M by hand or the like so as not to move. The nut 3 is screwed into the flanged short tube 1, and the nut 3 is connected to the end face 61 of the boss 6 of the saddle member 4.
When the nut 3 is further rotated after contact with the flange, the flanged short tube 1 moves, and the flange 2 of the flanged short tube 1 and the flange 5 of the saddle member 4 are moved.
Is firmly fixed across the manhole wall. At the same time, the elastic seal ring 9 is compressed between the manhole wall and the flange 2 of the flanged short tube 1.

During this time, since the flanged short tube 1 and the saddle member 4 are prevented from rotating relative to each other by the fitting of the vertical groove 7 and the projection 8, the flanged short tube 1 is moved with respect to the manhole M. Therefore, the inner surface of the manhole M and the flange 2 of the flanged short pipe 1 formed to have almost the same curvature as the inner surface of the manhole M.
The gap with the outer surface is kept substantially even, and the elastic seal ring 9 is almost evenly compressed. Also, the elastic seal ring 9
Has good water stopping properties without being twisted.

The pipe connecting socket S of the flanged short pipe 1 in the above embodiment has a sealing rubber ring R fitted in an annular groove for straight pipe bonding. In the case where a pipe with a rib having an annular rib is joined to the pipe, the annular rubber ring for sealing is held between the ribs on the outer surface of the end on the pipe side. It shall be formed in a straight socket which does not have a rubber ring for sealing.

[0024]

[Effects of the Invention] As is apparent from the above description, the pipe joint structure of the manhole of the present invention requires complicated work such as adjustment and application of cement mortar and a bonding agent like a conventional wet joint method. It requires no skill and can be constructed in a short time with simple work.

In addition, there is no need to wait for the pipe joining operation until the cement mortar or the cement hardens.

In addition, the initial joint strength is high, and the joints such as cement mortar and cement are damaged due to stress at the time of pipe joining, earth pressure after laying, wheel pressure, uneven settlement of the ground, etc. And high water shutoff reliability can be maintained for a long period of time.

[0027]

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a pipe joint structure of a manhole according to an embodiment of the present invention, in which (A) is a front sectional view cut along XX of (B), and (B) is a part of a nut removed; FIG. 3C is a plan view showing the state of the manhole, and FIG.

FIGS. 2A and 2B are explanatory views showing a saddle-shaped joint used in the prior art, in which FIG. 2A is a partially cutaway front view, and FIG. 2B is a side view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flanged short pipe 2 Flange 21 Outer surface of flange 3 Nut 4 Saddle member 5 Flange 51 Inner surface of flange 6 Boss 61 End face 7 Vertical groove 8 Projection 9 Elastic seal ring H Hole for pipe connection M Manhole S Receptacle T Male screw

Claims (1)

(57) [Scope of request for utility model registration] 1. A manhole pipe joint structure for joining a drainage pipe or a sewer pipe to a manhole, wherein the joint has a male thread cut into one end on an outer surface and a pipe joint receiving hole on an inner surface. Formed at the other end, a flanged short pipe having a flange abutting against the inner wall surface of the manhole, a nut engraved with a female screw to be screwed with a male screw of the flanged short pipe, A saddle member having a flange that abuts an outer wall surface, a hole through which a short tube portion of the short tube with a flange can be inserted, and a boss portion having a flat surface that abuts a nut is protrudingly provided. A rotation preventing means for preventing rotation between the saddle members, an elastic seal ring sandwiched between an inner wall surface of the manhole and the flange of the short tube with a flange, and a pipe joining hole opened in the manhole wall. The short tube part of the short tube with flange is inserted from the inner wall side of the manhole. The saddle member is externally fitted to the protruding portion of the flanged short tube via the rotation preventing means, and a nut is screwed and fastened to the male screw portion, so that the manhole and the flanged short tube are fitted. An elastic seal ring is compressed between the flanges of the manhole.