JP4663478B2 - Manhole joint device and ribbed tube connection structure - Google Patents

Description

  The present invention relates to a joint device for a manhole for attaching a ribbed pipe as a water distribution pipe to a connection hole drilled in a side wall of a manhole such as a sewer, and a ribbed pipe connection structure.

  Conventionally, as a manhole joint device 30 for connecting a ribbed tube 50 to a connection hole 42 formed in a side wall 41 of a manhole 40, there is one shown in FIG. The joint device 30 includes a joint member (joint) 31 and a ring group 32. The joint member 31 has a configuration in which a flange portion 34 is provided at the distal end portion of the short cylindrical portion 33, and the ring body group 32 includes the ring body 35 in each of the plurality of adjacent groove portions 51 of the ribbed tube 50. The adhesive tape 36 is wound around and integrated with the outer peripheral surface. Then, the flange portion 34 of the joint member 31 is connected to the side wall 41 of the manhole 40, and the assembly of the ribbed tube 50 and the ring body group 32 is inserted into the inner surface of the short tube portion 33 of the joint member 31, and the hose band 37 is used. The ribbed tube 50 is connected to the manhole 40 by tightening (see, for example, Patent Document 1).

However, in the joint device 30 of Patent Document 1, the rib 52 is inserted into the notch step portion formed on the inner peripheral surface of the ring body 35 by fitting the ring bodies 35 made of synthetic rubber one by one into the ribbed tube 50. Therefore, it is difficult to attach the ring body 35 to the ribbed tube 50 and it takes time to attach the ring body 35. In order to eliminate this drawback, it is conceivable to integrate a plurality of ring bodies 35 into a short tube sleeve 38 (see FIG. 5).
JP 2001-288774 A

In this case, the rubber of the short tube sleeve 38 is usually made of rubber having a rubber hardness of about 40 to 60 for the joint member 31 in order to absorb and relieve the external force acting on the ribbed tube 50 after construction. The hardest possible (the rubber hardness is greater) is easier to insert into the inner surface of the short cylindrical portion 33 of the joint member 31. On the other hand, if the rubber hardness of the short tube sleeve 38 is too large, there is a problem that it is difficult to fit the plastic tube 50 with a rib.
The present invention has been made in view of such circumstances, and provides a manhole joint device and a ribbed tube connection structure that can easily attach a short tube sleeve to a ribbed tube and a joint member. The purpose is that.

In order to achieve the above object, the present invention takes the following technical means.
The joint device for manholes of the present invention is a joint device for manholes for connecting a ribbed tube in which a large number of flange-shaped annular ribs are formed on the outer peripheral surface of a tube to a connection hole formed in a side wall of the manhole. The outer layer and the inner layer are made of two layers of rubber, and the outer peripheral surface of the ribbed tube is fitted over the ribbed tube so that the inner circumferential surface contacts the outer peripheral edge of at least two adjacent ribs. A cylindrical short tube sleeve to be inserted, an annular rubber joint member having one end connected to the connection hole of the manhole and the other end connected to the outer peripheral surface of the short tube sleeve, and the ribbed tube A diameter-reducing member that tightens the other end of the rubber joint member into which the short tube sleeve in an externally fitted state is inserted to the inside of the diameter, and inserts the inner layer into the groove portion of the ribbed tube, The rubber hardness of the outer layer of the short tube sleeve It is characterized in that it is larger than the rubber hardness of the inner layer and the joint member of the short pipe sleeve.

The ribbed tube connection structure of the present invention is such that one end of a rubber joint member is connected to a connection hole formed in the side wall of a manhole, and a flange-shaped annular rib is connected to the inner surface of the other end. A large number of ribbed pipes are inserted on the outer peripheral surface of the joint member, and are tightened by a reduced diameter member attached to the outer surface of the other end of the joint member. The inner surface of the other end of the joint member and the ribbed pipe In the ribbed tube connection structure in which a cylindrical short tube sleeve is disposed between the outer peripheral edges of at least two adjacent ribs, the short tube sleeve is made of two layers of rubber, an outer layer and an inner layer, rubber hardness of the short pipe sleeve outer layer, the are short pipe size than the rubber hardness of the inner layer and the coupling member of the sleeve Kuna', the reduced-diameter member is said short pipe sleeve in a state of fitted into tube with the ribs The other end of the rubber joint member into which is inserted The tightened on the radially inward side, it is characterized in that bite into the inner layer in the groove of the ribbed tube.

According to the connection structure of the manhole joint device and the ribbed tube, the short tube sleeve has a two-layer rubber structure of the outer layer and the inner layer, and the rubber hardness of the outer layer of the short tube sleeve is equal to the rubber hardness of the inner layer of the short tube sleeve and the joint member. Therefore, when fitting the short sleeve to the ribbed tube, the inner layer of the short tube sleeve has a lower rubber hardness than the outer layer and is softer than the ribbed tube made of plastic. The sleeve can be easily fitted on the ribbed tube.
On the other hand, when inserting the ribbed tube with the short tube sleeve fitted into the joint member, the outer layer of the short tube sleeve is harder than the joint member, so the ribbed tube with the short tube sleeve fitted to the joint member Easy to insert. Thereby, both the attachment of the short tube sleeve to the ribbed tube and the attachment of the short tube sleeve to the joint member can be easily performed.
In addition, because the reduced diameter member tightens the other end of the rubber joint member into which the short tube sleeve fitted to the ribbed tube is inserted to the inside of the diameter, the inner layer is inserted into the groove portion of the ribbed tube, The water stoppage between the short tube sleeve and the ribbed tube is improved.

  According to the present invention, since the rubber hardness of the outer layer of the short tube sleeve is made larger than the rubber hardness of the inner layer of the short tube sleeve and the rubber member of the joint member, the short tube sleeve can be easily attached to the ribbed tube and the joint member. Can be done.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a longitudinal sectional view showing a manhole joint device (hereinafter also simply referred to as “joint device”) according to an embodiment of the present invention, and FIG. 2 is a side view of a short tube sleeve of the joint device of FIG. FIG. 2 (a)) and a front view (FIG. 2 (b)). And FIG. 3 is a principal part longitudinal cross-sectional view which shows the connection structure of the tube with a rib which concerns on one Embodiment of this invention.

The joint device 1 is for connecting a ribbed tube 20 in which a large number of flange-shaped annular ribs 21 are formed on the outer peripheral surface of a tube to a connection hole 12 formed in a side wall 11 of a manhole 10. As shown in FIG. 1, a short tube sleeve 2 and a joint member 3 are provided.
As shown in FIGS. 2 (a) and 2 (b), the short tube sleeve 2 is a cylindrical sleeve made of two layers of rubber, that is, an outer layer 4 and an inner layer 5. In order to bring the peripheral surface into contact with the outer peripheral edges of at least two adjacent ribs 21 of the ribbed tube 20, it is cut to an appropriate length longer than the distance L between the outer peripheral edges of the two adjacent ribs 21. Various rubbers such as styrene butadiene rubber (SBR) can be used as the material of the rubber. As will be described later, rubber that is harder (has a higher rubber hardness) than the inner layer 5 is used as the outer layer 4.

  The joint member 3 has an annular shape, and an outer lip portion 6 that contacts the inner surface 12a of the connection hole 12 as one end portion connected to the connection hole 12 of the manhole 10 is connected to the outer peripheral surface 2a of the short tube sleeve 2. An inner lip portion 7 that abuts on the outer peripheral surface 2a of the short tube sleeve 2 is provided as the other end portion. The joint member 3 is formed so as to be narrowed from the outer lip portion 6 toward the inner lip portion 7. In addition, although the various rubber | gum which has flexibility is used for the joint member 3, SBR is especially suitable among them.

  Here, the outer layer 4 of the short tube sleeve 2 is made of rubber having higher hardness than the inner layer 5 and the joint member 3. That is, rubber hardness (JIS K 6253 durometer type A (Shore A)), the outer layer 4 of the short tube sleeve 2 is 70 to 90 (thickness 3.5 to 10 mm), the inner layer 5 is 20 to 40 (thickness 3.5 to 7 mm) and the joint member 3 is 40 to 60 (thickness 7 to 11 mm). In the joint device 1, the short tube sleeve 2 has a two-layer rubber structure of the outer layer 4 and the inner layer 5, and the rubber hardness of the outer layer 4 of the short tube sleeve 2 is determined from the rubber hardness of the inner layer 5 of the short tube sleeve 2 and the joint member 3. Therefore, when the short tube sleeve 2 is externally fitted to the ribbed tube 20, the inner layer 5 of the short tube sleeve 2 has a rubber hardness smaller than that of the outer layer 4, compared with the ribbed tube 20 made of plastic. Since it is soft, the outer fitting of the short tube sleeve 2 to the ribbed tube 20 becomes easy. Further, since the outer layer 4 of the short tube sleeve 2 is harder than the inner layer 5, the short tube sleeve 2 is not easily deformed when inserted, and this further facilitates external fitting. On the other hand, when the ribbed tube 20 with the short tube sleeve 2 fitted outside is inserted into the joint member 3, the outer layer 4 of the short tube sleeve 2 is harder than the joint member 3, so the rib with the short tube sleeve 2 fitted over It becomes easy to insert the attachment tube 20 into the joint member 3. Thereby, both the attachment of the short tube sleeve 2 to the ribbed tube 20 and the attachment of the short tube sleeve 2 to the joint member 3 can be easily performed.

  As shown in FIG. 3, in the ribbed tube connection structure (hereinafter also simply referred to as “connection structure”) S, one end of the rubber joint member 3 is inserted into the connection hole 12 formed in the side wall 11 of the manhole 10. A ribbed tube 20 having a plurality of flange-shaped annular ribs 21 formed on the outer peripheral surface of the tube is inserted into the inner surface of the other end portion (inner lip portion) 7. The short tube sleeve 2 is disposed between the inner surface of the other end portion (inner lip portion) 7 of the member 3 and the outer peripheral edge 21a of at least two adjacent ribs 21 of the ribbed tube 20, and the other end of the joint member. It is fastened by a reduced diameter member 8 attached to the outer surface of the portion (inner lip portion) 7. Since the joint device 1 is used for the connection structure S, the short tube sleeve 2 is made of two layers of rubber, that is, the outer layer 4 and the inner layer 5, and the rubber hardness of the outer layer 4 of the short tube sleeve 2 is as follows. It is larger than the rubber hardness of the inner layer 5 of 2 and the joint member 3.

Here, the short tube sleeve 2 is externally fitted to the ribbed tube 20 so that the inner peripheral surface 2b of the short tube sleeve 2 contacts the outer peripheral edge 21a of at least two adjacent ribs 21 of the ribbed tube 20. The inner peripheral surface 2b of the short tube sleeve 2 and the rib 21 of the ribbed tube 20 are connected in close contact with each other so as not to enter water or the like by tightening the reduced diameter member 8 described later.
The joint member 3 is provided with a reduced diameter member 8 for reducing the inner lip portion 7 in the radially inward direction and a diameter expanding member 9 for expanding the outer lip portion 6 in the radially outward direction. The diameter-reducing member 8 is a steel strip ring, and is attached with a metal fitting (not shown) that can be adjusted to reduce the diameter. Similarly, the diameter-expanding member 9 is also a band plate ring, and a metal fitting that can be adjusted to increase the diameter is attached. For the strip ring, it is preferable to use stainless steel having excellent corrosion resistance. Then, the outer lip portion 6 of the joint member 3 is brought into contact with the inner surface 12 a of the connection hole 12, and the outer lip portion 6 is expanded radially outward by the diameter-expanding member 9 and fixed to the inner surface 12 a of the connection hole 12. Thus, the connection hole 12 and the joint member 3 are connected. Further, the jointed member 3 and the short tube sleeve 2 are inserted by inserting a ribbed tube 20 fitted around the short tube sleeve 2 into the inner surface of the inner lip portion 7 and tightening with a reduced diameter member 8 attached to the outer surface of the inner lip portion 7. And the ribbed tube 20 are connected. Thereby, the connection hole 12 and the ribbed tube 20 are reliably connected.

Next, a method of connecting the ribbed tube 20 to the connection hole 12 of the manhole 10 using the joint device 1 (short tube sleeve 2 and joint member 3) will be described.
First, the outer lip portion 6 of the joint member 3 is brought into contact with the inner surface 12 a of the connection hole 12, and the diameter expanding member 9 is attached to the inner peripheral surface of the outer lip portion 6 to fix the joint member 3 to the connection hole 12.
Next, the short tube sleeve 2 is fitted onto the ribbed tube 20 so that the inner peripheral surface 2 b of the short tube sleeve 2 contacts the outer peripheral edges 21 a of at least two adjacent ribs 21 of the ribbed tube 20. Here, the order of the two steps may be reversed.
Subsequently, the ribbed tube 20 having the short tube sleeve 2 fitted thereon is inserted into the inner surface of the inner lip 7 of the joint member 3. Then, the reduced diameter member 8 is attached to the inner lip portion 7 and tightened, and the joint member 3 is fixed to the ribbed tube 20 to which the short tube sleeve 2 is fitted.
Then, if necessary, the excess portion of the ribbed tube 20 that protrudes to the inside of the manhole 10 is cut in accordance with the side wall 11 of the manhole, and the connection between the ribbed tube 20 and the manhole 10 is completed.

  In the connection structure S, the short tube sleeve 2 has a two-layer rubber structure of the outer layer 4 and the inner layer 5, and the rubber hardness of the outer layer 4 of the short tube sleeve 2 is determined from the rubber hardness of the inner layer 5 of the short tube sleeve 2 and the joint member 3. Therefore, when the short tube sleeve 2 is externally fitted to the ribbed tube 20, the inner layer 5 of the short tube sleeve 2 has a rubber hardness smaller than that of the outer layer 4, compared with the ribbed tube 20 made of plastic. Since it is soft, the outer fitting of the short tube sleeve 2 to the ribbed tube 20 becomes easy. On the other hand, when the ribbed tube 20 with the short tube sleeve 2 fitted outside is inserted into the joint member 3, the outer layer 4 of the short tube sleeve 2 is harder than the joint member 3, so the rib with the short tube sleeve 2 fitted over It becomes easy to insert the attachment tube 20 into the joint member 3. Thereby, both the attachment of the short tube sleeve 2 to the ribbed tube 20 and the attachment of the short tube sleeve 2 to the joint member 3 can be easily performed. Furthermore, by inserting a ribbed tube 20 with the short tube sleeve 2 fitted into the inner surface of the inner lip 7 of the joint member 3, and tightening with a reduced diameter member 8 with a force of 6.5 to 7.5 Nm, for example. Moreover, since the inner layer 5 having a rubber hardness of 20 to 40 is slightly difficult to enter the groove portion 22 of the ribbed tube 20, the water blocking property is excellent. The joint member 3 has a rubber hardness of 40 to 60, is flexible, and can be moved horizontally between the inner layer 5 of the short tube sleeve 2 and the ribbed tube 20, and is therefore earthquake resistant. Is excellent.

  In the present invention, the present invention is not limited to the above-described embodiment, and can be appropriately changed within the scope of the present invention. In the above embodiment, the outer lip portion 6 of the joint member 3 is pressure-bonded and fixed to the connection hole 12 by the diameter expanding member 9, but the means for expanding the outer lip portion 6 in the radially outward direction is the diameter expanding member 9. It is not limited, and any member or method that expands in the radial direction can be used. In addition, the abutting portions of the lip portions 6 and 7 of the joint member 3 are flat, but the abutting portions are shaped into saw-toothed irregularities, and a diameter expansion force or a diameter reducing force acts respectively. In such a case, the unevenness may be crushed and brought into close contact with each other to exert a crimping effect. Further, one end portion of the joint member 3 connected to the connection hole 12 of the manhole 10 is not limited to the outer lip portion 6, but any structure as long as it is connected to the connection hole 12 of the manhole 10 and closed. It may be a thing. For example, it is possible to provide one or a plurality of flange portions that are bonded and bonded to the outer surface of the side wall 11 with an adhesive or the like.

It is a longitudinal section showing a joint device for manholes concerning one embodiment of the present invention. (A) is a side view of the short tube sleeve of the joint device of FIG. 1, and (b) is a front view of the short tube sleeve of the joint device of FIG. It is a principal part longitudinal cross-sectional view which shows the connection structure of the pipe with a rib which concerns on one Embodiment of this invention. It is a longitudinal cross-sectional view which shows the conventional joint device for manholes. It is a longitudinal cross-sectional view which shows the comparative example of the joint apparatus for manholes.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Joint device for manholes 2 Short tube sleeve 3 Joint member 4 Outer layer of short tube sleeve 5 Inner layer of short tube sleeve 6 Outer lip part 7 Inner lip part 8 Reduced diameter member 10 Manhole 11 Side wall 12 Connection hole 20 Ribbed pipe 21 Rib S Ribbed tube connection structure

Claims (2)

A manhole joint device for connecting a pipe with a rib having a large number of flange-shaped annular ribs formed on the outer peripheral surface of a pipe to a connection hole drilled in a side wall of the manhole,
It is composed of two layers of rubber, an outer layer and an inner layer, and is fitted on the ribbed tube and inserted into the connection hole so that the inner peripheral surface thereof contacts the outer peripheral edge of at least two adjacent ribs of the ribbed tube. A tubular short tube sleeve,
One end is connected to the connection hole of the manhole, and an annular rubber joint member into which the short tube sleeve is inserted into the inner surface of the other end,
A diameter-reducing member that tightens the other end of the rubber joint member into which the short tube sleeve in an externally fitted state to the ribbed tube is inserted to the inside of the diameter, and inserts the inner layer into a groove portion of the ribbed tube; , And
A manhole joint device, wherein the rubber hardness of the outer layer of the short tube sleeve is made larger than the rubber hardness of the inner layer of the short tube sleeve and the joint member. One end of the rubber joint member is connected to the connection hole drilled in the side wall of the manhole, and a ribbed tube in which a large number of flange-shaped annular ribs are formed on the outer peripheral surface of the other end is inserted. Between the inner surface of the other end of the joint member and the outer periphery of at least two adjacent ribs of the ribbed tube. In the connection structure of the tube with the rib, in which the cylindrical short tube sleeve is arranged,
Wherein becomes short pipe sleeve of rubber of the two-layer outer layer and the inner layer rubber hardness of the short tube sleeve outer layer, and the size Kuna' than the rubber hardness of the inner layer and the joint member of the short tube sleeve,
The reduced diameter member tightens the other end portion of the rubber joint member into which the short tube sleeve in a state of being externally fitted to the ribbed tube is inserted to the inside of the diameter, and the inner layer is formed into a groove portion of the ribbed tube. A ribbed tube connection structure characterized by being bitten .

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