JP3787033B2 - Flexible joint structure and combination of flexible joint and waterproof substrate - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a flexible joint structure in which a ribbed pipe and a manhole are connected by a flexible joint. The present invention also relates to a combination of a flexible joint and a tubular waterproof base material for connecting a pipe with a rib and a manhole.
[0002]
[Prior art]
As a method for connecting a manhole and a pipe, a winding method is conventionally used in which the connecting portion between the manhole and the pipe is filled with concrete or mortar to stop water. Japanese Patent Laid-Open No. 8-232280 proposes a manhole joint for connecting a ribbed pipe to a manhole. Fig.7 (a) is the longitudinal cross-sectional view which cut | disconnected this joint in the length direction. FIG.7 (b) is a cross-sectional view of the manhole which attached this joint.
[0003]
As shown in FIG. 7 (a), the manhole joint 16 is composed of a short pipe 17 and a saddle 18, and as shown in FIG. 7 (b), the ribbed pipe 2 is fitted into the short pipe 17, and the short pipe 17 is attached to the inside of the saddle 18, and the ribbed pipe 2 is connected to the manhole 1 by filling the space between the outer periphery of the saddle 18 and the drilling surface 1 a of the manhole 1 with a binder 19 such as mortar. At this time, by installing a packing 20 larger than the outer periphery of the rib between the ribs of the ribbed pipe 2, the connection portion between the ribbed pipe 2 and the short pipe 17 is stopped.
[0004]
[Problems to be solved by the invention]
However, the packing provided in this way has a tendency that after the backfill, the rib tube is pushed to the lower side of the short tube by earth pressure and receives concentrated stress, and the packing material is compressed under the drilling portion, While the short pipe and the pipe with the rib are tightly stopped, a gap between the short pipe and the pipe with the rib opens above the drilled portion, the adhesion becomes weak, and sufficient water stoppage cannot be obtained.
[0005]
Moreover, in this winding method, it cannot be backfilled for a long time until the binder such as concrete is hardened, and the workability is inferior. Furthermore, the manhole constructed in this way has the drawback that cracks may occur in concrete or the like due to uneven settlement or earthquakes, and water leakage or unknown water intrusion is likely to occur.
[0006]
An object of this invention is to obtain the flexible joint structure which connects a pipe with a rib and a manhole reliably, and exhibits sufficient flexibility and water stop.
[0007]
[Means for Solving the Problems]
The present invention is a flexible joint structure comprising a manhole body, a ribbed pipe and a flexible joint, wherein the ribbed pipe and the manhole body are connected by the flexible joint, The flexible joint is made of a rubber-like elastic body, and the flexible joint has an attachment part, a water stop part, and a connection part, and the connection part connects the attachment part and the water stop part. The attachment portion is attached to the manhole body, the water stop portion surrounds the ribbed pipe, and a cylindrical waterproof base material is provided between the water stop portion and the ribbed pipe. The waterproof base material includes a rigid cylindrical body and a flexible water stop cover, and the cylindrical body is provided on the outer periphery of the ribbed pipe, Water stop cover Provided on the outer periphery of the cylindrical body, the water stop cover has an extending portion that extends beyond the cylindrical body, and the extending portion is on the outer peripheral surface of the ribbed pipe. The flexible joint structure is in close contact with the water stop portion and the water stop cover on the outer periphery of the cylindrical body.
[0008]
Further, the present invention is a combination of a flexible joint and a tubular waterproof base material for connecting a manhole body and a ribbed pipe, wherein the flexible joint is made of a rubber-like elastic body, and the flexible joint Has a mounting portion, a water stop portion, and a connecting portion, the connecting portion connects the mounting portion and the water stopping portion, and the mounting portion is attached to the manhole body, The water portion surrounds the ribbed pipe, and the waterproof base material includes a rigid cylindrical body and a flexible water stop cover, and the water stop cover is formed of the cylindrical body. Provided on the outer periphery, the water stop cover has an extending portion extending beyond the cylindrical body, the cylindrical body is provided on the outer periphery of the ribbed pipe, and the extension The portion is in close contact with the outer peripheral surface of the ribbed pipe, Body periphery on the of the water stop cover is to close contact with the waterproof part of the friendly rattan joint, it relates to a combination of a flexible joint with the waterproof base member.
[0009]
In order to overcome the drawbacks of the concrete winding method, the present inventor has examined the use of a water-stopper flexible joint made of rubber or soft plastic. Such a water stop flexible joint is known as shown in FIG. FIG. 8 is a longitudinal sectional view of a manhole structure using such a joint.
[0010]
As shown in FIG. 8, a straight pipe 22 is connected to the drilled portion 1 a of the manhole 1 through a water-stoppable joint 21. In such a joint structure, the water stop flexible joint 21 includes a tube side cylindrical portion 21a and a manhole side cylindrical portion 21b. The tube-side cylindrical portion 21a is fastened to the straight tube 22 with a fastening band 23 or the like, and the manhole-side cylindrical portion 21b is expanded toward the manhole drilling portion 1a with an extension band 24 or the like and is mechanically crimped and fixed.
[0011]
In such a manhole structure, even when the relative positional relationship between the manhole and the pipe changes due to the displacement of the ground or the like, the waterstop flexible joint follows these displacements and exhibits flexibility and waterstop.
[0012]
However, the present inventor shows that the water-stopper joint constructed in this way exhibits sufficient flexibility and water-stopper for the connection between the circular pipe and the manhole. In the case of a deformed pipe such as a pipe with ribs, the tube side cylindrical part of the joint and the pipe with ribs cannot be sufficiently adhered, and the resulting joint structure exhibits sufficient flexibility and water-stopping properties. I found out that I can't.
[0013]
As a result of further investigation by the present inventor, in such a pipe with a rib, even if a conventional water-stoppable joint is used, the rib becomes an obstacle, and the adhesiveness between the pipe-side cylindrical portion of the joint and the pipe decreases, Then, it turned out that a water stop flexible joint cannot be applied to a ribbed pipe.
[0014]
The present inventor studied various means in order to remove the obstacle of the rib portion. As a result, when constructing a flexible joint, the present inventor provided a tubular waterproof base material on the outer periphery of the ribbed pipe, and further provided a flexible joint on the outer periphery of the waterproof base material, thereby providing the ribbed portion. The present inventors have found that the obtained flexible joint structure can exhibit good water-stopping properties and flexibility even with pipes, and completed the present invention.
[0015]
The flexible joint according to the present invention includes an attachment portion, a water stop portion, and a connection portion. The connection part connects the attachment part and the water stop part, the attachment part is attached to the manhole body, and the water stop part surrounds the pipe with the rib.
[0016]
The waterproof base material according to the present invention includes a cylindrical body having rigidity and a waterproof cover having flexibility. The water stop cover is provided on the outer periphery of the cylindrical body and has an extending portion that extends beyond the cylindrical body. The cylindrical body is provided on the outer periphery of the ribbed pipe, and the extending portion is in close contact with the outer peripheral surface of the ribbed pipe.
[0017]
In the present invention, sufficient waterproofness between the waterproof base material and the ribbed pipe can be ensured by the extending portion of the waterproof cover. Further, in the present invention, the tubular body provided on the outer periphery of the ribbed pipe eliminates the obstacle of the rib portion of the ribbed pipe, so that the water stop portion and the water stop cover of the flexible joint on the outer periphery of the tubular body. Can be reliably adhered by surface bonding.
[0018]
In the flexible joint structure of the present invention, the ribbed pipe and the manhole are connected by a flexible joint via a waterproof base material, and sufficient flexibility and water-stopping performance can be exhibited.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view of an example flexible joint structure of the present invention. 2 is a side view of the flexible joint structure of FIG. FIG. 3 is a longitudinal cross-sectional view showing a state in which an example waterproof base material according to the present invention is attached. FIG. 4 is a longitudinal sectional view of another example of a flexible joint structure according to the present invention. FIG. 5 is a side view of the flexible joint structure of FIG. FIG. 6 is a vertical cross-sectional view showing a mounting state of another example of the waterproof base material according to the present invention.
[0020]
As shown in FIGS. 1 and 2, in the present invention, the manhole body 1 and the ribbed pipe 2 are connected by a flexible joint 3 and a cylindrical waterproof base material 4 to form a flexible joint structure 5. The The flexible joint 3 is made of a rubber-like elastic body, and has a mounting portion 3a, a water stop portion 3b, and a connecting portion 3c. The connection part 3c has connected the attachment part 3a and the water stop part 3b. The attachment portion 3a is attached to the drilling surface 1a of the manhole body 1, and the water stop portion 3b surrounds the ribbed pipe 2.
[0021]
The waterproof base material 4 is provided between the water stop portion 3 b and the ribbed pipe 2. The waterproof base material 4 includes a cylindrical body 4a having rigidity and a waterproof cover 4b having flexibility. The cylindrical body 4a is provided on the outer periphery of the ribbed pipe 2, and the water stop cover 4b is provided on the outer periphery of the cylindrical body 4a. The water stop cover 4b has an extending portion 4c extending beyond the cylindrical body 4a, and the extending portion 4c is in close contact with the outer peripheral surface of the ribbed pipe 2.
[0022]
In such a flexible joint structure 5, the uneven surface formed by the ribs 2 a and the valleys 2 b of the ribbed pipe 2 is flattened by the cylindrical body 4 a, so that the water-stopping part 3 b of the flexible joint 3. And the water stop cover 4b are bonded to each other on the outer periphery of the cylindrical body 4a to ensure close contact.
[0023]
As shown in FIG. 1, the water-stop cover 4b has one extending portion 4c protruding from the cylindrical body 4a fastened and fixed to the ribbed pipe 2 by a fastening band 6 at a valley portion 2b between the ribs 2a. , It can be securely attached.
[0024]
As shown in FIG. 1, a fastening band 7 can be provided on the outer peripheral surface of the water stop portion 3 b of the flexible joint 3. With this fastening band 7, the water stop portion 3b can be fastened and fixed to the outer peripheral surface of the water stop cover 4b.
[0025]
Further, as shown in FIG. 1, an adhesive material layer, an elastic foam layer or a water-swellable elastomer layer 8 is provided between the water stop portion 3b and the water stop cover 4b, and the adhesive material layer and the elastic foam layer are provided. Or the water stop part 3b and the water stop cover 4b can be closely_contact | adhered through the water expansible elastomer layer 8. FIG. Such an adhesive layer, an elastic foam layer or a water-swellable elastomer layer is useful when used for a part to be pressed and fixed or a part to be clamped and fixed.
[0026]
The fastening portion 3a of the flexible joint 3 can be attached to the drilling surface 1a of the manhole body 1 by the extension band 9, as shown in FIG. At this time, if the adhesive material layer, the elastic foam layer or the water-swellable elastomer layer 10 is disposed between the drilling surface 1a and the mounting portion, higher adhesion is obtained between the drilling surface 1a and the mounting portion. be able to.
[0027]
The flexible joint and the water stop cover according to the present invention can be formed of a material having a large number of elasticity. For example, at least one elastic material selected from synthetic rubber such as styrene / butadiene rubber, EPDM, chloroprene rubber, natural rubber, soft vinyl chloride resin, thermoplastic elastomer, and the like can be used.
[0028]
In addition, the cylindrical body, the fastening band, and the expansion band according to the present invention can be made of materials such as stainless steel, rust-proof plated steel, hard plastic, and fiber reinforced plastic. Among them, a material that hardly corrodes is particularly desirable.
[0029]
Furthermore, the pressure-sensitive adhesive layer, elastic foam layer or water-swellable elastomer layer according to the present invention can be formed from at least one material selected from a butyl rubber pressure-sensitive adhesive material, a water-swellable elastomer, a rubber sponge and the like.
[0030]
The waterproof base material 4 concerning this invention can be attached to the pipe 2 with a rib, as shown in FIG. First, the ribbed pipe 2 is inserted into the cylindrical body 4a so that the inner peripheral surface of the cylindrical body 4a is along the outer peripheral surface of the rib 2a. Next, the ribbed pipe 2 covered with the cylindrical body 4a is inserted. Can be inserted into the water stop cover 4b.
[0031]
At that time, the extension portion 4c of the water stop cover 4b is folded back as shown in FIG. 3, and the ribbed pipe 2 is inserted into the water stop cover 4b in this state as the extension portion 4d. When the water stop cover 4b reaches a predetermined position on the outer periphery of the cylindrical body 4a, the folded portion 4d that has been folded back is folded back in the T direction, and the extended portion 4c is returned to the valley portion 2b between the ribs 2a. It can be adhered.
[0032]
As shown in FIG. 1, the extending portion of the water-stop cover provided in this way is a rib valley portion and can be fixed with water from the outer periphery by a fastening band. After that, the ribbed pipe is inserted into the water stop portion of the flexible joint attached to the manhole drilling surface and positioned, and then the water stop portion and the water stop cover are connected and fixed by the fastening band. A water structure can be formed.
[0033]
In the present invention, a flexible joint structure as shown in FIGS. 4 and 5 can be formed. In the flexible joint structure 11, a waterproof base material 12 that stops water near the top of the rib 2 a of the ribbed pipe 2 can be used.
[0034]
The waterproof base material 12 includes a rigid cylindrical body 12a and a water stop cover 12b, and the water stop cover 12b has an extending portion 12c that protrudes from the cylindrical body 12a. The extending portion 12c is a wide fastening band 13 that is fastened to the top of the rib 2a of the ribbed pipe 2 and fixed with water.
[0035]
The ribbed pipe 2 provided with the waterproof base material 12 in this way is inserted into the water-stopping portion 3b of the flexible joint 3 attached to the drilling surface 1a of the manhole body 1 and positioned. The part 3b and the water stop cover 12b are connected and fixed by the fastening band 7, and the water stop structure 11 is formed.
[0036]
As shown in FIGS. 4 and 6, an adhesive layer, an elastic foam layer, or a water-swellable elastomer layer 14 can be provided between the extending portion 12 c and the ribbed pipe 2. In this case, as shown in FIG. 4, if the extending portion 12 c is fastened and fixed to the top of the rib 2 a on the outer peripheral surface of the ribbed pipe 2 by the fastening band 13, the rib 2 a becomes an adhesive material layer and an elastic foam layer. Alternatively, the rib 2a bites into the water-swellable elastomer layer 14 and the adhesive layer, the elastic foam layer or the water-swellable elastomer layer 14 is securely adhered.
[0037]
Moreover, as shown in FIG. 4, the expansion band 9 can be equipped with an installation position fixing bracket 15 that can determine the installation position of the flexible joint 3 by welding or the like. Thereby, the stable installation position of the flexible joint 3 can be ensured, and water-stopping also improves.
[0038]
【The invention's effect】
According to the flexible joint structure of the present invention, it is possible to easily connect a ribbed pipe and a manhole, which conventionally required complicated processing, and the relative positional relationship between the manhole and the ribbed pipe is displaced in the connected state. Even so, it is possible to follow the displacement of the flexible joint and the waterproof base material and to sufficiently maintain the water-stopping property. For this reason, the flexible joint structure of the present invention is extremely useful for management and maintenance of sewerage facilities.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an example flexible joint structure of the present invention.
FIG. 2 is a side view of the flexible joint structure of FIG.
FIG. 3 is a longitudinal sectional view showing an example of a waterproof base material attached according to the present invention.
FIG. 4 is a longitudinal sectional view of another example of a flexible joint structure according to the present invention.
FIG. 5 is a side view of the flexible joint structure of FIG. 4;
FIG. 6 is a longitudinal sectional view showing a mounting state of another example of the waterproof base material according to the present invention.
FIG. 7A is a longitudinal sectional view of a conventional joint cut in the length direction.
(B) is the cross-sectional view of the manhole which attached the joint of (a).
FIG. 8 is a longitudinal sectional view of a manhole structure using a flexible joint.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Manhole main body 1a Drilling surface 2 Ribbed pipe 2a Rib 2b Valley part 3 Flexible joint 3a Attachment part 3b Water stop part 3c Connection part 4,12 Waterproof base material 4a, 12a Cylindrical body 4b, 12b Water stop cover 4c, 12c Extension part 4d Folded extension part 5, 11 Flexible joint structure 6, 7, 13, 23 Fastening band 8, 10, 14 Adhesive material layer, elastic foam layer or water-expandable elastomer layer 9, 24 Expansion band 15 Mounting position fixing bracket 16 Joint 17 Short pipe 18 Saddle 19 Bonding material 20 Packing 21 Water stop flexible joint 22 Straight pipe

Claims (6)

A flexible joint structure comprising a manhole body, a ribbed pipe and a flexible joint, wherein the ribbed pipe and the manhole body are connected by the flexible joint,
The flexible joint is made of a rubber-like elastic body, and the flexible joint has an attachment part, a water stop part, and a connection part, and the connection part connects the attachment part and the water stop part. The attachment portion is attached to the manhole body, the water stop portion surrounds the ribbed pipe, and a cylindrical waterproof base material is provided between the water stop portion and the ribbed pipe. The waterproof base material includes a rigid cylindrical body and a flexible water stop cover, and the cylindrical body is provided on the outer periphery of the ribbed pipe, The water stop cover is provided on an outer periphery of the cylindrical body, the water stop cover has an extending portion that extends beyond the cylindrical body, and the extending portion has the rib. It is in close contact with the outer peripheral surface of the pipe, and on the outer periphery of the cylindrical body, Wherein the is a water stop cover in close contact with the parts, flexible joint structure. The fastening band is provided in the outer peripheral surface of the said water stop part, The said water stop part is clamp | tightened and fixed to the outer peripheral surface of the said water stop cover by the said fastening band, The Claim 1 characterized by the above-mentioned. Flexible joint structure. The flexible joint according to claim 1 or 2, wherein the water stop portion and the water stop cover are in close contact with each other via an adhesive layer, an elastic foam layer, or a water-swellable elastomer layer. Construction. A fastening band is provided on the outer peripheral surface of the extending portion, and the extending portion is fastened and fixed to a trough portion of a rib on the outer peripheral surface of the ribbed pipe by the fastening band. The flexible joint structure according to any one of claims 1 to 3. A fastening band is provided on the outer peripheral surface of the extension part, and an adhesive material layer, an elastic foam layer or a water-swellable elastomer layer is provided between the extension part and the pipe with a rib. The extending portion is fastened and fixed to the top of the rib on the outer peripheral surface of the ribbed pipe by the fastening band, and the top of the rib is the adhesive material layer, the elastic foam layer or the water expandable 5. The structure according to claim 1, wherein the top of the rib is in contact with the pressure-sensitive adhesive layer, the elastic foam layer, or the water-swellable elastomer layer. The described flexible joint structure. It is a combination of a flexible joint and a cylindrical waterproof base material that connects the manhole body and the ribbed pipe,
The flexible joint is made of a rubber-like elastic body, and the flexible joint has an attachment part, a water stop part, and a connection part, and the connection part connects the attachment part and the water stop part. The attachment portion is attached to the manhole body, the water stop portion surrounds the ribbed pipe, and the waterproof base material has a rigid cylindrical body and a water stop cover having flexibility. The water stop cover is provided on an outer periphery of the cylindrical body, and the water stop cover has an extending portion that extends beyond the cylindrical body. A rib is provided on the outer periphery of the ribbed pipe, the extending portion is in close contact with the outer peripheral surface of the ribbed pipe, and the water stop cover is disposed on the outer periphery of the cylindrical body. A flexible joint characterized by being closely attached to the water part The combination of the waterproof base material.

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