JP3123876B2 - Manhole fittings for ribbed pipes - 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 joint which can easily and reliably connect a pipe with ribs to a side wall of a manhole or the like.

[0002]

2. Description of the Related Art In the field of sewer pipes in which pipes are buried underground, ribbed pipes having a large number of ribs protruding from the outer peripheral surface thereof at predetermined intervals in the pipe axis direction have conventionally been used. Is proposed in, for example, Japanese Utility Model Laid-Open Publication No. 2-305593.

[0003]

However, in the case of this manhole joint, after inserting the end of the pipe with the rib into the hole formed in the side wall of the manhole, the hole and the outer periphery of the pipe end where the rib protrudes. Since the mortar is filled in the gap between the mortar and the surface, a large amount of mortar for backfilling is required, but there is a problem that sufficient watertightness cannot be obtained.

That is, when a pipe with ribs is connected to the side wall of a manhole, a hole larger by the height of the rib must be formed than when a pipe of a standard size is connected. A large amount of mortar must be filled into the wide gap between the outer peripheral surface of the pipe end, and the ribs become obstacles and the mortar cannot be filled evenly, so sufficient watertightness can be obtained. There was nothing. Further, when the ribbed pipe is directly fixed to the side wall of the manhole with mortar, there is a problem that an exchanging method cannot be performed in which the end of the ribbed pipe inserted into the hole in the side wall is protruded into the inside of the manhole and then pulled back. Was.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and an object of the present invention is to provide a manhole joint in which a pipe with ribs can be easily and reliably connected to a hole formed in a side wall of a manhole or the like by an exchanging method.

[0006]

SUMMARY OF THE INVENTION The present invention provides a short pipe into which a pipe with a rib is inserted, provided with a guide surface which is expanded in a tapered shape at one end thereof, and is provided on the outer peripheral surface of the short pipe with a side wall such as a manhole. Provide a saddle to be connected. Also, an auxiliary member having a guide surface which is tapered toward the opening side is detachably attached to the other end of the short pipe.

[0007]

Since the guide surface which is expanded in a tapered shape is provided at one end of the short pipe, a pipe with a rib can be easily inserted into the short pipe. Further, since the auxiliary member having the guide surface which is expanded in a tapered shape is detachably attached to the other end of the short pipe, when the pipe with the rib protruding to the other end side of the short pipe is pulled back, the guide face is not attached. It can be easily pulled back as a guide.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing a state in which a ribbed pipe is connected using a manhole joint according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing a state where a ribbed pipe is connected, and FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing of the manhole joint which shows an Example, The code | symbol 1 in a figure is a pipe with a rib, 2 is a side wall, such as a manhole, and 3 is a manhole joint.

The ribbed pipe 1 is a pipe made of a synthetic resin such as vinyl chloride resin or polyethylene, and has a plurality of ribs 11 projecting from the outer peripheral surface thereof at predetermined intervals in the pipe axis direction. A packing 12 is mounted between the ribs 11 at the end of the ribbed pipe 1 so as to protrude slightly from the rib 11.

On the other hand, the manhole joint 3 is composed of a short tube 31 made of synthetic resin, a saddle 33 and an auxiliary member 35. A guide surface 32 which is expanded in a tapered shape is provided at one end of the short tube 31. The inner diameter of the short pipe 31 is set to an intermediate value between the outer diameter of the rib 11 of the ribbed pipe 1 and the outer diameter of the packing 12, and when the end of the ribbed pipe 1 is inserted into the short pipe 31, The outer peripheral surface of the packing 12 is in close contact with the inner peripheral surface of the short pipe 31 in a watertight manner. A cylindrical body 34 having a saddle 33 is extrapolated and fixed to the outer peripheral surface of the short tube 31. A guide surface 351 expanded in a tapered shape toward the opening side is provided at the other end of the short tube 31. The auxiliary member 35 is detachably mounted. The saddle 33 is a short tube 3
1 may be provided integrally on the outer peripheral surface.

The ribbed pipe 1 is connected to a side wall 2 such as a manhole.
First, a hole 21 slightly larger than the outer diameter of the short pipe 31 of the manhole joint 3 is formed in the side wall 2. Then, the end of the pipe with ribs 1 is inserted into the short pipe 31 of the manhole joint 3, and the packing 12 attached to the end is pushed along the guide surface 32 of the short pipe 31 while reducing the diameter. Next, the other end of the short pipe 31 is inserted into a hole 21 formed in the side wall 2, and the ribbed pipe 1 protruding from the other end of the short pipe 31 by an exchange method as shown by a two-dot chain line in FIG. Is pulled back to match the end of the short tube 31.
At this time, the packing 12 attached to the end of the ribbed pipe 1 is reduced in diameter along the guide surface 351 of the auxiliary member 35 attached to the other end of the short pipe 31, so that the ribbed pipe 1 can be easily pulled back. I can do it.

After setting the ribbed pipe 1 and the manhole joint 3 at predetermined positions in this way, the auxiliary member 35 is removed from the other end of the short pipe 31, and the saddle 33 of the manhole joint 3 as shown in FIG. A bonding material 4 such as mortar is filled and connected between the hole 2 and the side wall 2 such as a manhole and the hole 21. Thus, the ribbed pipe 1 and the side wall 2 such as a manhole are firmly joined via the manhole joint 3.

In the manhole joint 3 shown in FIG. 3, when the manhole joint 3 and the side wall 2 such as a manhole are connected by using a bonding material 4 such as mortar, the auxiliary member 35 is embedded without being removed. Things. When the auxiliary member 35 is not removed as in this embodiment,
Even after the manhole joint 3 is connected to the side wall 2 such as a manhole, the exchanging method of the pipe 1 with ribs can be easily performed.

[0014]

As described in detail above, according to the present invention, since the guide surfaces are provided at both ends of the short pipe, a connecting operation for inserting the end of the pipe with the rib into the short pipe and the other end of the short pipe are provided. The work of pulling back the end of the ribbed pipe protruding from the pipe can be easily performed.
Therefore, when the manhole joint of the present invention is used, an on-site exchange method can be easily performed, and the ribbed pipe can be simply and reliably connected to the side wall of the manhole or the like.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a step in the process of connecting a ribbed pipe using a manhole joint according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a state in which a ribbed pipe is connected to a side wall of a manhole or the like.

FIG. 3 is a sectional view of a manhole joint showing another embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 ribbed pipe 2 side wall such as manhole 3 manhole joint 4 binder such as mortar 11 rib 21 hole 31 short pipe 32 guide surface 33 saddle 35 auxiliary member

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16L 5/00 F16L 5/02 F16L 1/02

Claims (1)

(57) [Claims] 1. A ribbed pipe (1) having a large number of ribs (11) projecting from an outer peripheral surface thereof at predetermined intervals in a pipe axis direction is connected to a hole (21) formed in a side wall (2) such as a manhole. A manhole joint (3) used in this case, wherein a guide surface (32) which is expanded in a tapered shape is provided at one end of a short tube (31) into which a ribbed pipe (1) is inserted. Saddle (33) connected to the side wall (2) such as a manhole is provided on the outer peripheral surface of (31), and the other end of short pipe (31) is a guide surface which is tapered toward the opening side. (3
51. A manhole joint for a pipe with ribs, wherein an auxiliary member (35) having 51) is detachably mounted.