JP4082550B2 - Manhole flexible joint mounting structure and manhole flexible joint - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a mounting structure for a manhole flexible joint used for connecting a ribbed pipe to a side wall of a manhole and the manhole flexible joint.
[0002]
[Prior art]
FIG. 6 shows a conventional manhole flexibility used to connect a so-called ribbed pipe P in which a plurality of flange-shaped annular ribs R are formed around a hole H formed in the side wall A of the manhole. Indicates a joint.
The flexible joint for manholes is fixed to the outer periphery of the pipe 20 and the outer circumference of the pipe 20 with a diameter slightly larger than the diameter of the ribbed pipe P, and the flange portion 22a is fixed to the side wall A of the manhole. An annular rubber packing 23 that is elastically brought into contact with the inserted ribbed pipe P is fixed to the inner peripheral surface of the pipe 20.
[0003]
As a similar technique, for example, one described in JP-A-11-21929 can be cited. This is because the inner cylinder part with a flange attached to the side wall of the manhole is fastened 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 the pipe with the rib via the rubber ring.
[0004]
[Problems to be solved by the invention]
However, in both of the inventions disclosed in FIG. 6 and Japanese Patent Laid-Open No. 11-21929, the ribbed pipe P into which the rubber packing 23 or the rubber ring attached to the inner peripheral surface of the pipe 20 or the sleeve short pipe is inserted. There is a problem that the sealing performance is insufficient because the sealing performance is ensured by elastic contact.
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 manhole flexible joint is deformed, and the sealing function by the rubber packing 23 or the rubber ring may be lowered. As a result, water may leak from between the ribbed pipe and the manhole flexible joint.
[0005]
Further, the mounting position of the rubber packing 23 or the rubber ring is the inner peripheral surface side of the pipe 20 or the sleeve short tube, and the ribbed pipe is inserted to a predetermined position with the rubber packing 23 or the rubber ring attached. Since it is necessary, it cannot be inserted smoothly. 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.
[0006]
SUMMARY OF THE INVENTION An object of the present invention is to provide a manhole flexible joint mounting structure in which a ribbed pipe can be easily inserted and has excellent sealing properties, and a manhole flexible joint.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention , a plurality of flange-shaped annular ribs (R) are formed around a hole (H) formed in a side wall (A) of a manhole. An attachment structure of a flexible joint for manholes for connecting a pipe with rib (P), comprising a tubular joint body (10) made of an elastic member, and the pipe with rib of the joint body (10) The rear part (Y) located on the opposite side to the insertion port part side of (P) is attached to the hole (H) provided in the manhole, and the joint is the insertion port part side of the ribbed pipe (P) On the outer periphery of the front portion (X) of the main body portion (10), a fixing auxiliary material having a substantially wedge-shaped cross section fitted between adjacent annular ribs (R, R) formed on the ribbed pipe (P) ( 11) and a hose band (12) wound around the outer periphery of the fixing auxiliary material (11). By reducing the diameter of the fixing auxiliary material (11) by tightening the band (12), the inner peripheral side of the front part (X) of the joint body part (10) is inserted into the ribbed pipe (P) inserted. It is characterized by being configured to be pressed and abutted between adjacent annular ribs (R, R).
[0008]
In the invention according to claim 2, the thickness of the front portion (Xa) of the front portion (X) of the joint main body portion (10) is further determined by pressing the thickness of the portion (Xa) further forward than the portion pressed by the fixing auxiliary material (11). It is characterized by being thicker than the thickness of the portion to be obtained.
[0009]
Furthermore, the invention described in claim 3 is characterized in that the rear portion (Y) of the joint main body (10) is attached to a hole (H) provided in the manhole by expanding the diameter .
[0010]
According to a fourth aspect of the present invention, there is provided a ribbed pipe in which a plurality of flange-shaped annular ribs (R) are formed at intervals around a hole (H) formed in a side wall (A) of a manhole. P) is a manhole flexible joint for connecting, and has a cylindrical shape made of an elastic member, and the rear portion (Y) located on the side opposite to the insertion port side of the ribbed pipe (P) Provided on the outer periphery of the joint body (10) attached to the hole (H) provided in the manhole and the front (X) of the joint body (10) on the insertion port side of the ribbed pipe (P) The cross-section that can be fitted between the adjacent annular ribs (R, R) formed on the ribbed pipe (P) is substantially wedge-shaped, and one notch (11a) is formed. Annular fixing auxiliary material (11) and the outer periphery of the fixing auxiliary material (11) are wound around In addition, both end portions (11b, 11b) of the fixing auxiliary material (11) facing each other with the notch portion (11a) interposed therebetween so that the notch portion (11a) formed in the fixing auxiliary material (11) is eliminated. ) To reduce the diameter of the fixing auxiliary material (11), thereby deforming the front part (X) of the joint main body part (10), and the front part (X) inner peripheral side, And a hose band (12) capable of being pressed and abutted between adjacent annular ribs (R, R) of the ribbed pipe (P) .
[0011]
The symbols in parentheses described in the means for solving the above-described problems correspond to the symbols described in the drawings and embodiments of the invention described later.
[0012]
According to invention of Claim 1 and Claim 4 , the connection of a joint main-body part and a pipe with a rib is the annular rib which adjoins the front part of a joint main-body part directly via a fixing auxiliary material and a hose band. In order to press and fix them in between, the front part of the joint body made of an elastic member is deformed and elastically contacts the ribbed pipe. Thus, since the connection between the joint body and the ribbed pipe becomes strong, the sealing performance between the joint body and the ribbed pipe is sufficiently ensured even under the influence of earth pressure.
In addition, the fixing auxiliary material and the hose band are provided on the outer periphery of the joint main body, and there is no protrusion like the rubber packing shown in the conventional example on the inner peripheral side. Is easy and simplifies the installation work.
[0013]
According to the invention described in claim 2, in addition to the function and effect of the invention described in claim 1, the meat of the front part of the joint main body part further ahead of the part pressed by the fixing auxiliary material the thickness, therefore are thicker than the thickness of the part to be pressed, the connection between the joint main body and the ribbed pipe portion thick even pulling force is applied to the ribbed pipe and the role of the stopper easy I will not leave.
[0014]
Further, according to the invention described in claim 3, in addition to the function and effect of the invention described in claim 1 or 2, the rear portion of the joint main body is attached to the hole provided in the manhole by expanding the diameter. So it is easy to install .
[0016]
DETAILED DESCRIPTION OF THE INVENTION
A manhole flexible joint according to an embodiment of the present invention will be described with reference to the drawings. In addition, the same code | symbol was described to the part same as a prior art example. FIG. 1 shows a state in which a flexible joint for manholes according to an embodiment of the present invention is used, and partially shows a cross section.
[0017]
As shown in FIG. 1, a flexible joint for manholes according to an embodiment of the present invention is a ribbed pipe in which a plurality of flange-shaped annular ribs R are formed around a hole H formed in a side wall A of a manhole. It is used to connect P, and is mainly composed of a joint main body 10, a fixing auxiliary material 11, and a hose band 12.
[0018]
The joint main body 10 is a cylinder made of synthetic rubber such as EPDM having excellent weather resistance and chemical resistance, and has flexibility, so that the pipe P with ribs can be easily inserted. The inner diameter is slightly larger than the outer diameter of the ribbed pipe P.
[0019]
The rear portion Y of the joint body 10 opposite to the insertion port side of the ribbed pipe P has a flange shape and is expanded into a hole H provided in the manhole by using the overhang fitting 13. It can be installed.
On the contrary, on the outer periphery of the front portion X that is the insertion port portion side of the joint main body portion 10, a fixing auxiliary material 11 and a hose band 12 wound around the outer periphery of the fixing auxiliary material 11 are provided.
[0020]
As shown in FIGS. 2 and 3, the fixing auxiliary material 11 has an annular shape in which a part thereof is cut out, and has a wedge shape in which the cross section protrudes toward the ribbed pipe P, and is formed on the ribbed pipe P. It fits between the adjacent annular ribs R, R. Further, the fixing auxiliary material 11 is made of rubber, and by tightening the hose band 12, the diameter of the fixing auxiliary material 11 is reduced so that the cutout portion 11 a disappears, thereby deforming the front portion X of the joint main body portion 10. The inner peripheral side of the front portion X is pressed and fixed between the adjacent annular ribs R, R of the inserted pipe P with ribs.
Note that both end portions 11b and 11b of the fixing auxiliary member 11 facing each other with the notch portion 11a interposed therebetween are cut obliquely so that the both end portions 11b and 11b come into contact with each other when the hose band 12 is tightened. Further, the length of the fixing auxiliary material 11 is adjusted in advance to a size necessary for ensuring an appropriate connection state.
[0021]
Further, a recess 15 into which the hose band 12 is fitted is formed on the outer periphery of the auxiliary auxiliary material 11 so that the hose band 12 is prevented from falling off. Further, in the front part X of the joint main body part 10, the thickness of the part Xa further ahead of the part pressed by the auxiliary auxiliary material 11 is set to be thicker than the thickness of the pressed part, and is drawn into the ribbed pipe P. Even if force is applied, the thick portion Xa serves as a stopper so that the joint body 10 and the ribbed pipe P are not disconnected.
[0022]
In order to connect the ribbed pipe P using the manhole flexible joint configured as described above, first, the rear portion Y of the joint body 10 is expanded using the overhanging fitting 13 and provided in the manhole. To the hole H formed.
Next, after passing the fixing auxiliary material 11 through the pipe P with ribs, the pipe P with ribs is inserted from the insertion port of the front part X of the joint body 10. At this time, since the inner peripheral surface side of the joint main body 10 is flat and has no protrusions, the insertion is performed very smoothly.
Thereafter, the fixing auxiliary material 11 is moved to the outer periphery of the front portion X of the joint main body 10 and aligned between the adjacent annular ribs R, R of the pipe P with ribs (state shown in FIG. 4).
When the hose band 12 is tightened until the both end portions 11b and 11b of the fixing auxiliary material 11 come into contact with each other, the connection is completed.
[0023]
According to this, the connection between the joint body 10 and the ribbed pipe P is performed between the adjacent annular ribs R and R directly on the front part X of the joint body 10 via the fixing auxiliary material 11 and the hose band 12. For this reason, the front portion X of the joint body 10 made of an elastic member is deformed and elastically contacts the ribbed pipe P. Therefore, the sealing performance between the joint main body 10 and the ribbed pipe P is sufficiently ensured even if affected by the earth pressure.
[0024]
In the present embodiment, the shape of the rear portion Y of the joint body 10 may be a skirt shape as shown in FIG. Further, in this embodiment, the rear portion Y of the joint body 10 is easily attached to the hole H of the manhole by expanding the diameter using the overhanging fitting 13, but it is of a type that can be attached without particularly expanding the diameter. Is also applicable.
Further, the fixing auxiliary material 11 is provided with a notch portion 11a and is deformed and fixed so as to eliminate the notch portion 11a. What is necessary is just to deform | transform so that it may become small.
[0025]
【The invention's effect】
As described above, according to the flexible joint for manholes according to claim 1 and claim 4 , the connection between the joint main body portion and the pipe with the rib is performed in front of the joint main body portion via the fixing auxiliary member and the hose band. Since the portion is directly pressed between the adjacent annular ribs and firmly fixed, the sealing performance between the joint main body portion and the ribbed pipe is sufficiently ensured even under the influence of earth pressure.
In addition, the fixing auxiliary material and the hose band are provided on the outer periphery of the joint main body, and there is no protrusion like the rubber packing shown in the conventional example on the inner peripheral side. Is easy and simplifies the installation work.
[0026]
According to the invention described in claim 2, in addition to the function and effect of the invention described in claim 1, the meat of the front part of the joint main body part further ahead of the part pressed by the fixing auxiliary material the thickness, therefore are thicker than the thickness of the portion pressed against the connection fitting body portion and the ribbed pipe portion thick even pulling force is applied to the ribbed pipe and the role of the stopper easy I will not leave.
[0027]
Further, according to the invention described in claim 3, in addition to the function and effect of the invention described in claim 1 or 2, the rear portion of the joint main body is attached to the hole provided in the manhole by expanding the diameter. So it is easy to install .
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional side view showing a state in which a manhole flexible joint according to an embodiment of the present invention is used.
FIG. 2 is an enlarged cross-sectional view showing a main part of FIG.
FIG. 3 is a perspective view showing the fixing auxiliary material shown in FIG. 1;
FIG. 4 is a partial cross-sectional side view showing a state before the manhole flexible joint according to the embodiment of the present invention is attached.
FIG. 5 is a partial sectional side view showing a state in which a manhole flexible joint according to another embodiment of the present invention is used.
FIG. 6 is a partial cross-sectional side view showing a state where a conventional manhole flexible joint is used.
[Explanation of symbols]
10 Joint body 11 Fixed auxiliary material 11a Notch 11b Both ends 12 Hose band 13 Overhang metal fitting 15 Recess 20 Pipe 21 Hose band 22 Joint body 22a Flange 23 Rubber packing A Manhole side wall H Hole P Ribbed pipe R Annular rib X Front part Xa Front part Y Rear part

Claims (4)

An attachment structure of a flexible joint for manholes for connecting a pipe with a rib, in which a plurality of flange-shaped annular ribs are formed around a hole formed in a side wall of a manhole ,
Provided with a cylindrical joint body made of an elastic member,
The rear portion of the joint body portion, which is located on the opposite side to the insertion port side of the ribbed pipe, is attached to a hole provided in the manhole,
In addition, a fixing auxiliary material having a substantially wedge-shaped cross section that fits between adjacent annular ribs formed on the ribbed pipe on the outer periphery of the joint main body portion on the insertion opening side of the ribbed pipe. And a hose band wound around the outer periphery of the fixing auxiliary material, and by inserting the front inner peripheral side of the joint main body portion by reducing the diameter of the fixing auxiliary material by tightening the hose band A mounting structure for a flexible joint for manholes , characterized in that it is configured to be pressed against and abutted between adjacent annular ribs of the ribbed pipe. 2. The manhole according to claim 1, wherein a thickness of a front portion of the front portion of the joint main body portion is further thicker than a thickness of the portion to be pressed further than a portion pressed by the fixing auxiliary material. Flexible joint mounting structure . The attachment structure for a flexible joint for manholes according to claim 1 or 2, wherein the rear part of the joint body part is attached to a hole provided in the manhole by expanding the diameter. A manhole flexible joint for connecting a plurality of ribbed pipes with a plurality of flange-shaped annular ribs spaced around a hole formed in a side wall of a manhole,
A tubular body made of an elastic member, and a joint body portion attached to a hole provided in the manhole, a rear portion located on the opposite side to the insertion port portion side of the ribbed pipe;
The cross section that is provided on the outer periphery of the front portion of the joint main body portion on the insertion port side of the pipe with ribs and can be fitted between adjacent annular ribs formed on the pipe with ribs is substantially wedge-shaped. An annular fixing auxiliary material formed with one notch, and
The fixing auxiliary material is wound around the outer periphery of the fixing auxiliary material and brought into contact with both ends of the fixing auxiliary material facing each other with the notch portion therebetween so that the notch portion formed in the fixing auxiliary material is eliminated by tightening. As described above, by reducing the diameter of the fixing auxiliary member, the front portion of the joint body portion is deformed, and the inner peripheral side of the front portion is pressed and abutted between the adjacent annular ribs of the ribbed pipe. A flexible joint for manholes, comprising:

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