JP2002070052A - Flexible joint for manhole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flexible joint for manholes, in which a ribbed pipe can be easily inserted and excellent in sealing performance. A hole H formed in a side wall A of a manhole.
A flexible joint for connecting a ribbed pipe P having a plurality of flange-shaped annular ribs R formed therearound, comprising a tubular joint body 10 made of an elastic member;
The rear part Y located on the side opposite to the insertion opening side of the ribbed pipe P is attached to a hole H provided in a manhole, and furthermore, the joint body 1 which is located on the insertion opening side of the ribbed pipe P.
0, a thick portion 10a protruding inward is formed, and a fastening member 12 is wound around the outer periphery of the thick portion 10a. Is pressed and fixed between the adjacent annular ribs R of the inserted pipe with ribs P.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manhole flexible joint used for connecting a ribbed pipe to a side wall of a manhole.

[0002]

2. Description of the Related Art FIG. 7 shows a conventional structure used for connecting a so-called ribbed pipe P having a plurality of annular flanges R formed around a hole H formed in a side wall A of a manhole. 2 shows a flexible joint for a manhole. This flexible joint for manholes is fixed to a PVC pipe 20 having a diameter slightly larger than the diameter of the ribbed pipe P by fastening a hose band 21 to the outer periphery of the pipe 20.
2a is a joint body 22 fixed to the side wall A of the manhole
An annular rubber packing 23 elastically in contact with the inserted pipe P with a rib is fixed to the inner peripheral surface of the pipe 20.

A similar technique is disclosed in, for example,
No. 21,929, for example. This is because the inner cylinder part provided with a flange, which is attached to the side wall of the manhole, is tightened with a band to the sleeve short pipe into which the ribbed pipe is inserted, and a rubber ring is provided on the inner peripheral surface of the sleeve short pipe. And connected to a ribbed pipe via the rubber ring.

[0004]

However, the invention disclosed in FIG. 7 and Japanese Patent Application Laid-Open No. H11-21929 each have a rubber packing 23 or a rubber ring attached to the inner peripheral surface of a pipe 20 or a short sleeve. However, there is a problem that the sealing property is insufficient because the sealing property is secured by elastically contacting the inserted pipe with ribs P. That is, when the manhole flexible joint is buried in the soil together with the ribbed pipe, it is affected by the earth pressure. Therefore, if the earth pressure is strong, the flexible joint for manholes is deformed, and the sealing function by the rubber packing 23 or the rubber ring may be reduced. As a result, water may leak from between the ribbed pipe and the manhole flexible joint.

The rubber packing 23 or the rubber ring is mounted on the inner peripheral side of the pipe 20 or the short sleeve of the sleeve. When the rubber packing 23 or the rubber ring is mounted, the ribbed pipe is positioned at a predetermined position. It is not possible to insert it smoothly because it is necessary to insert it. In particular, if the width and height of the rubber packing 23 or the rubber ring are increased in order to improve the sealing effect, the insertion operation is difficult due to catching.

An object of the present invention is to provide a flexible joint for manholes in which a ribbed pipe can be easily inserted and which has excellent sealing properties.

[0007]

In order to achieve the above object, a flexible joint for manholes according to the first aspect of the present invention has a flange (H) formed in a side wall (A) of the manhole. A flexible joint for manholes for connecting a pipe with ribs (P) having a plurality of annular ribs (R) formed therearound, comprising: a tubular joint body (10) made of an elastic member; The rear portion (Y) of the main body (10), which is located on the opposite side to the insertion opening side of the ribbed pipe (P), is attached to a hole (H) provided in a manhole. A thick portion (10a) protruding inward is formed at the front portion (X) of the joint body portion (10) on the side of the insertion opening portion of P), and is formed on the outer periphery of the thick portion (10a). Is thickened by tightening the fastening member (12). The (10a), adjacent annular ribs (R, R) of the inserted ribbed pipe (P), characterized by being configured to fix pressing between.

[0008] The second aspect of the present invention provides a method for manufacturing a vehicle, comprising:
Lips (15) are provided on both left and right side surfaces of Oa) so that the lip (15) elastically contacts the side surface of the annular rib (R) when the thick portion (10a) is pressed and fixed.

Further, the invention according to claim 3 is characterized in that the rear portion (Y) of the joint body (10) is attached to the hole (H) provided in the manhole by expanding the diameter.

The symbols in parentheses described in the means for solving the above-mentioned problems correspond to the symbols described in the drawings and the embodiments of the invention described later.

According to the flexible joint for a manhole according to the first aspect, the connection between the joint body and the ribbed pipe is made directly by the thick portion formed at the front part of the joint body via the fastening member. In order to press and fix between the adjacent annular ribs, the front portion of the joint main body made of an elastic member firmly elastically contacts the ribbed pipe. As described above, since the connection between the joint body and the pipe with ribs is strengthened, the sealing property between the joint body and the pipe with ribs is sufficiently ensured even under the influence of earth pressure.
Further, since the fastening member is provided on the outer periphery of the joint main body, its attachment is easy.

Further, according to the flexible joint for manholes according to the second aspect, in addition to the function and effect of the first aspect, the lips provided on the left and right side surfaces of the thick part can be pressed and fixed. Since the elastic rib is in contact with the side surface of the annular rib, the connection between the joint body and the ribbed pipe is not easily separated even if a pulling force is applied to the ribbed pipe.

Further, according to the flexible joint for manholes according to the third aspect, in addition to the function and effect of the invention according to the first or second aspect, the rear portion of the joint main body is enlarged in diameter to form a manhole. Since it is attached to the provided hole, attachment is easy.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A flexible joint for manholes according to an embodiment of the present invention will be described with reference to the drawings. The same parts as those in the conventional example are denoted by the same reference numerals. FIG.
1 shows a state in which the flexible joint for manholes according to the embodiment of the present invention is used, and shows a partial cross section.

In the flexible joint for manholes according to the embodiment of the present invention, as shown in FIG. 1, a plurality of flange-shaped annular ribs R are formed around a hole H formed in a side wall A of the manhole. It is used to connect the ribbed pipe P, and is mainly composed of a joint body 10 and a fastening member composed of a hose band 12.

The joint body 10 is made of a synthetic rubber, such as EPDM, having excellent weather resistance and chemical resistance and is flexible and has a tubular shape so that the pipe P with ribs can be easily inserted. The inner diameter of the main body 10 is slightly larger than the outer diameter of the ribbed pipe P.

A rear portion Y of the joint body 10 opposite to the side of the insertion opening of the ribbed pipe P has a flange shape and is provided in a manhole by expanding the diameter thereof by using a projection 13. It can be attached to the hole H. Conversely, as shown in FIG. 2, an annular thick portion 10a protruding inward is formed on the outer periphery of the front portion X on the insertion opening side of the joint main body portion 10, and is wound around the outer periphery. The tightened hose band 12 is pressed and fixed between the adjacent annular ribs R, R.
The thick portion 10a is formed integrally with the front portion X of the joint main body 10, but may be formed separately and fixed.

Lips 15 are provided on both left and right sides (right and left as viewed from the front in FIG. 2) of the thick portion 10a. When the thick portion 10a is pressed and fixed, the lip 15 is attached to the side surface of the annular rib R. It comes into contact with the ball. Thereby, even if a pull-out force is applied to the ribbed pipe P, the resistance is increased, so that the connection between the joint body 10 and the ribbed pipe P is not easily separated.

In order to connect the pipe P with ribs using the flexible joint for manholes constructed as described above, first, the rear part Y of the joint main body 10 is enlarged by using a projection 13 to expand the diameter. Attach it to the hole H provided in the manhole. Next, the ribbed pipe P is inserted through the insertion opening of the front part X of the joint main body part 10, and the thick part 10a formed in the front part X of the joint main body part 10 is connected to the annular rib adjacent to the ribbed pipe P. R, R
It is positioned in the middle (the state shown in FIG. 3). When the hose band 12 is tightened, the connection is completed.

According to this, the connection between the joint body 10 and the pipe P with a rib is made by directly connecting the thick part 10 a formed at the front part X of the joint body 10 via the hose band 12 to the adjacent annular part. In order to press and fix between the ribs R, the front part X of the joint main body 10 made of an elastic member firmly elastically contacts the ribbed pipe P. Therefore, the sealing performance between the joint body 10 and the pipe with ribs P is sufficiently ensured even if the seal is affected by the earth pressure. Moreover, the lip 15 formed on both sides of the thick portion 10a elastically contacts the annular rib R, so that the sealing function is further enhanced.

In this embodiment, the hose band 12 is used as the fastening member. However, the present invention is not limited to this. For example, as shown in FIG. 4, rigidity (for example, made of stainless steel, hard PVC, or the like) is used. ) Fixing auxiliary material 16
And the hose band 12 may be used in combination. A fixing auxiliary member 16 is wound around an outer periphery of a thick portion 10a formed at a front portion X of the joint body 10, and a hose band 12 is further wound around the outer periphery.
The thick part 10a is firmly pressed between the adjacent annular ribs R by reducing the diameter of the fixing auxiliary member 16 by tightening. As shown in FIG. 5, the fixing auxiliary member 16 has a spiral shape (a ring shape having a cut and a diameter gradually reduced).

The shape of the rear part Y of the joint body 10 is as follows.
As shown in FIG. 6, it may be spread in a skirt shape. Further, in the present embodiment, the rear portion Y of the joint main body 10 is easily expanded and fitted to the hole H of the manhole by using the protruding metal fitting 13. Is also applicable.
Further, the lips 15 are formed on both side surfaces of the thick portion 10a. However, the lip 15 is not particularly provided as long as the thick portion 10a is fitted between the annular ribs R.

[0023]

As described above, according to the flexible joint for manholes according to the first aspect, the connection between the joint body and the pipe with the rib is formed at the front portion of the joint body via the fastening member. The thick portion is directly pressed and firmly fixed between the adjacent annular ribs, so that the sealing performance between the joint body and the ribbed pipe is sufficiently secured even under the influence of earth pressure. Further, since the fastening member is provided on the outer periphery of the joint main body, its attachment is easy.

According to the flexible joint for manholes according to the second aspect, in addition to the function and effect of the first aspect, the lips provided on the left and right side surfaces of the thick portion can be pressed and fixed. Since the elastic rib is in contact with the side surface of the annular rib, the connection between the joint body and the ribbed pipe is not easily separated even if a pulling force is applied to the ribbed pipe.

Further, according to the flexible joint for manholes according to the third aspect, in addition to the function and effect of the invention according to the first or second aspect, the rear portion of the joint main body is enlarged in diameter to form a manhole. Since it is attached to the provided hole, attachment is easy.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional side view showing a state where a flexible joint for manholes according to an embodiment of the present invention is used.

FIG. 2 is an enlarged sectional view showing a main part of FIG.

FIG. 3 is a partial cross-sectional side view showing a state before a flexible joint for manholes according to an embodiment of the present invention is attached.

FIG. 4 is an enlarged sectional view of a main part showing a state where a flexible joint for manholes according to another embodiment of the present invention is used.

5 (a) is a front view and FIG. 5 (b) is a side view showing the fixing auxiliary member shown in FIG.

FIG. 6 is a partial sectional side view showing a state in which a flexible joint for manholes according to another embodiment of the present invention is used.

FIG. 7 is a partial cross-sectional side view showing a state where a flexible joint for manholes according to a conventional example is used.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Joint main body part 10a Thick part 12 Hose band 13 Overhang metal fitting 15 Lip 16 Fixing auxiliary material 20 Pipe 21 Hose band 22 Joint main body part 22a Flange part 23 Rubber packing A Manhole side wall H hole P Rib pipe R Ring rib X Front Part Y Rear

Claims (3)

[Claims] 1. A manhole flexible joint for connecting a ribbed pipe having a plurality of flange-like annular ribs formed around a hole formed in a side wall of a manhole, the cylinder comprising an elastic member. A rear portion of the joint body portion, which is located on a side opposite to the insertion opening side of the ribbed pipe, is attached to a hole provided in the manhole, and A thick portion protruding inward is formed at a front portion of the joint body portion on the insertion port side, and a tightening member is wound around an outer periphery of the thick portion, and the tightening member tightens the tightening member. , The thick part,
A flexible joint for manholes, which is configured to be pressed and fixed between adjacent annular ribs of the inserted pipe with ribs. 2. The lip according to claim 1, wherein lips are provided on both left and right side surfaces of said thick portion, and said lip is elastically contacted with a side surface of said annular rib when said thick portion is pressed and fixed. A flexible joint for a manhole as described in the above. 3. The flexible joint for manholes according to claim 1, wherein a rear portion of the joint body is attached to a hole provided in the manhole by expanding a diameter.