JP3317664B2 - Socket part of flexible joint for manhole - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for connecting a water collecting basin and a sewer main pipe for sewage treatment, and more particularly to a socket portion of a flexible joint for manholes.

[0002]

2. Description of the Related Art The applicant of the present invention has an excellent connection with a water collecting sill and a sewer main in a manhole, and has an excellent water leakage preventing ability even when a vertical and horizontal relative displacement between the water collecting sill and the sewer main occurs during an earthquake. Japanese Patent Application Hei 8-
A patent application was filed as No. 202976.

As shown in FIG. 4, the prior patent application discloses a water hole 6 having the same diameter as the inner diameter of a sewer main pipe 5 ′, which protrudes from the outer surface of a wall 2 ′ of a water collecting wall 1 ′ of a manhole. And a divergent tapered hole 8 ′ is opened toward the outer surface of the wall 2 ′ through the stepped portion 7 ′ having a larger diameter than the water passage hole 6 ′. In the socket 4 '
A cushion member 10 'having a hole 9' having the same diameter as the water passage hole 6 'is provided in a step portion 7' at the inner end of the tapered hole 8 ', and a concave groove 11' is formed on the outer periphery of the socket 4 '. And one end of a cylindrical flexible cover 12 'is connected to the groove 11'.
And the other end of the flexible cover 12 'is fastened to the outer periphery of a sewer main pipe 5' whose tip abuts against the cushion material 10 '.
A water leakage prevention structure fixed at 3 'has been proposed.

[0004] The water leakage prevention structure a 'at the connecting portion of the sewer main pipe constructed as described above can be used even when relative displacement occurs vertically and horizontally between the water collecting pipe 1' and the sewer main pipe 5 'during an earthquake. In the lateral displacement of ', the detachment of the sewer main pipe 5' from the socket 4 'is prevented by the expansion and contraction of the flexible cover 12', and the impact of the tip of the sewer main pipe 5 'is reduced by the cushioning material 10'. Breakage is prevented, and the vertical displacement is absorbed without breakage by the vertical deflection of the flexible cover 12 'and the play in the space 14' between the outer periphery of the sewer main pipe 5 'in the tapered hole 8' and water is leaked. It is intended to prevent it.

[0005]

However, the socket portion of the flexible joint for manholes described above does not sufficiently prevent water leakage, and is made of a concrete block, so that it is heavy and inconvenient to handle. If the thickness is too small, the strength is reduced and there is a disadvantage that the thickness cannot be reduced. Therefore, the socket portion of the above patent application is improved. In view of the above, the present invention has been made in view of the above points, and a rubber ring has been arranged in place of the cushion material to prevent water leakage, and by attaching a rib, pulling out and rotation have been prevented, Another object of the present invention is to provide a socket for a flexible joint for manholes, in which the thickness of the socket is reduced by using reinforced plastic or stainless steel as the material of the socket.

[0006]

In order to solve the above-mentioned problems, the socket of the flexible joint for manholes of the present invention protrudes from the outer surface of the wall of the water collecting trough of the manhole.
A water passage hole having the same diameter as the inner diameter of the sewer main pipe is opened inside, and a divergent shape is formed continuously from the water passage hole toward the outer surface of the wall through a step portion having a larger diameter than the water passage hole. A tapered hole and an opening having the same diameter connected to the tapered hole are opened, a rib is provided on an outer periphery of a buried portion embedded in the wall via a cement mortar, and the other end is joined to an outer periphery of a sewer main pipe. One end of the flexible cover is joined to the outer periphery of the protruding tip, and in a cylindrical socket portion having a rubber ring disposed between the inner surface of the opening and the outer periphery of the sewer main pipe, a notch for preventing rotation is provided on the outer periphery of the rib. And one end of the flexible cover is fastened by a fastening band across the flange provided on the outer periphery of the tip of the socket .
And the rubber ring is tapered
And the outer periphery of the sewer main .

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Generally, manhole assembly consists of installation of bottom plate, body block, straight wall, slope wall, adjustment ring, receiving frame and manhole cover, and installation of inflow pipe and outflow pipe to manhole, and the water collection of the present invention Corresponds to the vehicle body block. As shown in FIG. 1, the collecting basin 1 of the manhole is made of a concrete block and has an opening composed of a wall 2 having an inner diameter R. Above the collecting basin 1 is a straight wall, a sloped wall of a cylindrical concrete block. Are assembled to form a manhole. The collecting body 1 of the wall 2
A cylindrical socket portion 4 having a smaller diameter than the joining hole 3 is inserted into the circular joining hole 3 penetrating through the joint hole 3 and the socket portion 4.
Is fixed by injecting cement mortar 6 (grout). The material of the socket part 4 is made of reinforced plastic or stainless steel. The end of the socket portion 4 located on the inner peripheral surface of the water collecting trough 1 has an inner diameter R of the wall 2.
The center hole of the socket part 4 opens a water hole 9 having the same diameter as the inner diameter of the sewer main pipe 5 toward the outer surface of the wall body 2. The step portion 7 having a larger diameter than the water passage hole 9 is provided continuously from the hole 9. Step 7
Has a sewer main pipe 5 with a rubber ring 10 fitted on the front end.
The cylindrical flexible cover 12 is fixed by a tightening band 13 between the flange portion 11 on the outer periphery of the distal end of the socket portion 4 and the outer periphery of the sewer main pipe 5. The sewer main pipe 5 is composed of a fume pipe, a PVC pipe, or the like. Note that the sewer main pipe 5 is joined to at least two places in the water collecting trough 1, but only one of them is shown in FIG. 1 because both have the same structure.

Referring to FIG. 2, the socket portion 4 of the flexible joint for manholes according to the present invention will be described in more detail.
As shown in (a), the socket part 4 is made of a cylindrical reinforced plastic or stainless steel, the outer diameter of which is smaller than the joining hole 3 of the water collecting basin 1 and the length thereof is one of the above-mentioned water collecting basin 1. When it is fixed to the joint hole 3 via the cement mortar 6, it is composed of a portion embedded in the wall 2 and a portion protruding from the outer surface of the wall 2. A portion of the socket portion 4 buried in the wall body 2 is provided with a rib 15 in the circumferential direction of the outer periphery. The rib 15 is shown in FIG. 2B, which is a left side view of FIG. As described above, a plurality of notches 18 for stopping rotation are provided. The row, number and height of the ribs 15 can be appropriately selected as long as the socket 15 does not come off and rotate.

The end of the socket portion 4 located on the inner peripheral surface of the water collecting trough 1 is rounded along the arc of the inner diameter R of the wall 2, and the socket portion 4 extends from the rounded portion to the wall. A water hole 9 having the same diameter as the inner diameter of the sewer main pipe 5 is opened toward the outer surface of the body 2, and the water hole 9 is continuous with the water hole 9.
A step 7 having a larger diameter is provided. Further, a divergent tapered hole 8 is opened from the stepped portion 7 toward the outer surface of the wall 2, and the end is set at a position short of the outer surface of the wall 2. An opening 16 having the same diameter is formed toward the flange 11 at the protruding tip of the socket 4. As a result, a center hole having the step 7 is formed. When the distal end of the sewer main pipe 5 is brought into contact with the stepped part 7 of the socket part 4, the outer periphery of the sewer main pipe 5 and the center hole (the tapered hole 8 and the opening 1
A space 14 is formed between the space 14 and 6).

Before the tip of the sewer main pipe 5 is brought into contact with the stepped portion 7 of the socket part 4, a rubber ring 10 is fitted to the front part of the sewer main pipe 5 outside. The rubber ring 10 is compressed between the tapered hole 8 and the outer periphery of the sewer main pipe 5 by bringing the sewer main pipe 5 fitted with the rubber ring 10 into contact with the stepped portion 7 of the socket part 4. It is completely sealed to prevent water leakage.

FIG. 3 shows another embodiment of the present invention in which a rib 17 is provided around the outer periphery of the socket portion 4. As shown in FIG. Since the configuration other than the rib 17 is the same as that shown in FIG. 2, the description is omitted, and only the rib 17 is described, and the end of the socket portion 4 located on the inner peripheral surface of the water collecting trough 1 is A radius is provided along the arc of the inner diameter R of the wall 2, and a rib 17 is provided around the outer periphery of the socket portion 4 in parallel with the radius. The ribs 17 are buried in the wall 2 of the water collecting basin 1 with the cement mortar 6 so that the socket portion 4 does not come off and rotate. That is, the rib 17 protrudes from the outer peripheral surface of the socket portion 4 so that the rib 17 is prevented from coming off, and the rib 17 is bent in the circumferential direction in parallel with the inner diameter R of the wall 2 of the water collecting basin 1. As a result, rotation in the circumferential direction is prevented because the shape is not perfectly circular.

The socket portion 4 of the flexible joint for manholes of the present invention can be used with the lateral displacement of the sewer main pipe 5 even if the water collection 1 and the sewer main pipe 5 are displaced vertically and horizontally during an earthquake. The expansion and contraction of the flexible cover 12 prevents the sewer main pipe 5 from coming off from the socket part 4, and the front part of the sewer main pipe 5 is prevented from leaking by a rubber ring 10. In addition, when the sewer main pipe 5 is vertically displaced, the flexible cover 12
Of the center hole opening 16 and the outer periphery of the sewer main pipe 5 are absorbed without breakage by water in the space 14 to prevent water leakage.

[0013]

The socket portion of the flexible joint for manholes of the present invention has a lateral displacement of the sewer main pipe due to expansion and contraction of a flexible cover for waterproofly connecting the socket section and the sewer main pipe.
Removal of the sewer main from the socket is prevented ,
Since the rubber ring is compressed between the tapered hole and the sewer main pipe, it is possible to prevent water leakage even when external force is applied in the release direction, and to prevent pulling out and rotation through the rib. As a result, it is possible to further prevent water leakage at the joint of the manhole and the wall, and to improve the seismic performance.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a flexible joint for manholes of the present invention.

2 (a) is an enlarged sectional view of a socket portion of the flexible joint for manholes of the present invention, and FIG. 2 (b) is a left side view of FIG. 2 (a).

FIG. 3 is an enlarged sectional view of another embodiment of the socket portion of the flexible joint for manholes of the present invention.

FIG. 4 is a partial cross-sectional view of a socket part of a flexible joint for manholes of the prior application.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water collecting 2 Wall 3 Joint hole 4 Socket part 5 Sewer main pipe 6 Cement mortar 7 Step part 8 Tapered hole 9 Water passage hole 10 Rubber ring 11 Flange part 13 Tightening band 14 Space 15 Rib 16 Opening 17 Rib 18 Cut Chip

Claims (1)

(57) [Claims] 1. A water hole having the same diameter as the inner diameter of a sewer main pipe is opened inside and protrudes from an outer surface of a wall of a water collecting trough of a manhole, and is connected to the water hole through the water hole. An embedded tapered hole diverging toward the outer surface of the wall through the large-diameter stepped portion, and an opening having the same diameter continuous to the tapered hole is opened, and embedded in the wall via cement mortar. A rib is provided on the outer periphery of the part, the other end is joined to the outer periphery of the sewer main pipe, one end of the flexible cover is joined to the outer periphery of the protruding tip, and a rubber ring is arranged between the inner surface of the opening and the outer periphery of the sewer main pipe. In the cylindrical socket portion comprising: a plurality of non-rotating notches are arranged on the outer periphery of the rib,
One end of the flexible cover is joined to the outer periphery of the socket portion with a tightening band by straddling the flange portion provided on the outer periphery of the distal end of the socket portion, and the rubber ring is tapered to the outer periphery of the sewer main pipe.
And a socket part of a flexible joint for manholes, which is crimped between the socket.