JP2002310369A - Flexible joint with fixed plate for communication cable and method of attaching it - Google Patents

Abstract

(57) [Abstract] (with correction) [PROBLEMS] To provide a flexible joint integrated with a fixed plate for connection between an outer tube accommodating a communication cable and a handhole. SOLUTION: In order to fix a fixing plate 10 to a flexible joint main body 6, a plurality of claws 11 for supporting the inner wall surface of a hand hole 1 are provided on the surface of the fixing plate, and on the other hand, a plurality of fixing plate fixing jigs. The tool 12 is adhesively fixed to the joint body,
A fixed plate integrated type flexible joint for connecting and fixing a fixing plate and a fixing plate mounting jig by a connecting member 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixed joint for fixing a sheath tube in a flexible joint used for a connection between an outer tube containing a plurality of sheath tubes through which a communication cable such as an optical cable is inserted and a handhole. The present invention relates to a joint integrated with a plate and a method of attaching the joint.

[0002]

2. Description of the Related Art In a conventional joint, an outer pipe for accommodating a handhole and a communication cable is connected and fixed to an inner wall of a hole of a handhole by an expansion band installed in a flexible joint made of rubber. Is fastened with a tightening band, but the sheath tube housed in the outer tube is connected and fixed through a connector to a fixing plate fixed by an anchor plug that is separately drilled around the drilled hole on the inner wall side of the hand hole and fixed by an anchor plug It is a method that is performed.

However, for example, Japanese Patent Laid-Open No. 2000-29
As described in Japanese Patent No. 5749, in the method in which the fixing plate is fixed to the inner wall of the handhole by the anchor plug, when the hole for inserting the anchor plug is made around the hole, There is a problem in that it is difficult to make a hole by hitting the reinforcing bar disposed in the vehicle, or a crack is generated when the hole is made, and groundwater infiltrates from the crack.

[0004] Also, since communication cable storage conduits such as optical cables are generally buried along roads, vibrations generated by the passage of vehicles are transmitted to the underground handhole, and the anchor plug may come off. As a result, the fixing plate may come off from the handhole, and the cable itself may be damaged.

On the other hand, in order to solve the above problem, Japanese Patent Laid-Open No.
Japanese Patent Application Publication No. 000-295749 proposes connecting and fixing a fixing plate to an extension band with a plurality of connecting members. However, according to the method disclosed in the publication, the fixing plate is vertically mounted on the inner wall surface of the drill hole of the hand hole. There is a risk of falling off from the hole. Further, if the fixing plate is installed in a structure in which the fixing plate is pushed into the center of the inner wall of the drill hole, there is a problem in workability.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a fixed plate integrated type flexible joint which solves the above-mentioned problems of the prior art, and a method of mounting the same.

[0007]

Means for Solving the Problems The inventors of the present invention have made intensive studies to solve the above-mentioned problems, and as a result, the above-mentioned problems are solved by a fixed plate integrated type flexible joint satisfying the following requirements. This led to the completion of the present invention. The present invention relates to a flexible joint for connecting an outer tube for accommodating a communication cable and a handhole, the outer tube-side tubular portion which is coaxially inserted into and fixed to the outer tube, and a drilled surface of a handhole wall surface. The joint body is coaxially connected to and integrated with the cylindrical part of the handhole on the handhole, the extension band for fixing the joint body to the hole in the handhole wall, and the communication cable housed in the outer tube. Plate integrated with a fixing plate having a plurality of claws at a position along the perforation circumference of the handhole wall for fixing the sheath tube to be fixed, a fixing plate attaching jig adhered to the joint body, and a connecting member thereof It is a system flexible joint.

According to the present invention, there is provided a flexible joint for connecting an outer tube accommodating a communication cable and a handhole to a joint body, an extension band for fixing the joint body to a hole in the handhole, and an outer tube. A fixing plate for fixing a sheath tube for housing a communication cable such as an optical cable housed in the housing;
It comprises a fixing plate mounting jig for fixing the fixing plate to the joint body, and a connecting member therefor. The joint body has a shape in which an outer tube-side tubular portion that is coaxially inserted into and fixed to an outer tube and a handhole-side tubular portion that is in contact with a drilled surface are coaxially connected and integrated. . The fixing plate has a plurality of claws on the surface of the handhole drilling inner wall side such that the weight of the fixing plate itself and the entire weight of the sheath tube containing the communication cable are supported by the inner wall surface of the drilling hole of the handhole. And the plurality of claw portions are positioned so as to enter along the inner wall surface of the hole. Further, the fixed plate-integrated type flexible joint of the present invention is characterized in that a plurality of fixing plate mounting jigs are bonded and fixed to the rubber joint main body, whereby a force in a coaxial direction with the outer tube is provided. It is possible to correspond to. The extension band is disclosed in Japanese Patent Application Laid-Open No.
JP-A-217840 discloses an annular body in which engagement portions at both ends having a plurality of engagement positions are engaged with each other, wherein the engagement portions can slide through in the radially expanding direction of the extension band, and can slide through. It is preferable that the expansion band be reengaged at a later enlarged position to lock the reduced diameter of the expansion band.

[0009] Regarding the shape and size of the nail set on the fixing plate, the nail may fall out of the handhole even if the positional relationship between the handhole and the outer tube accommodating the communication cable or the like slightly shifts, supporting the above-mentioned weight. Anything that does not have to be used. The nail is preferably made of an L-shaped stainless steel having a width of 10 to 30 mm, a length of about 10 to 50 mm and a thickness of about 2 to 5 mm in a direction substantially parallel to the axis of the hole, and a plurality of nails are formed by a hole circle. It is preferable to be located at equal intervals on the surface of the fixed plate along the circumference.

[0010] The fixing plate mounting jig is installed between the rubber flexible joint body and the extension band, and the bonding to the rubber flexible joint is performed by vulcanization bonding, ordinary rubber-based adhesive, or instant adhesive. Any material may be used as long as it can firmly adhere. The fixing plate mounting jig is further firmly fixed because the rubber flexible joint cylindrical portion is pressed together with the rubber portion when the diameter is expanded by the expansion band.

In the flexible joint of the present invention, the fixing plate is not directly fixed to the handhole, but is provided on the fixing plate as described above for the force applied to the section perpendicular to the axis of the outer tube. With a plurality of claw portions, and against the force applied in the same direction as the shaft, it is firmly fixed up and down, left and right, front and back by connecting through a connecting member with a fixing plate mounting jig adhesively fixed to the rubber joint body . For this reason, the watertightness between the handhole and the outer pipe for accommodating the cables and the like is excellent, and the flexible joint does not fall off against an earthquake, vibration of a vehicle, or the like, and sufficient watertightness can be maintained.

The material of the flexible joint body is not limited as long as it is flexible, but is preferably made of rubber. As the rubber, ethylene propylene rubber (EPDM), styrene butadiene rubber (SBR) or the like is used. For the extension band, the tightening band, the fixing plate, the fixing plate attaching jig, and the fixing plate connecting member, it is preferable to use stainless steel from the viewpoint of corrosion resistance to water and the like.

In order to ensure that the water hole of the handhole and the watertightness of the flexible joint are completely waterproof, a water-swelling rubber tape is applied to the outside of the handhole-side tubular portion of the flexible joint to be crimped with an extension band. It is more preferable to provide a water-swelling rubber member such as to attach it. As the water-swellable rubber, those commonly used in the technical field such as civil engineering can be used.

According to the method of attaching a flexible joint according to the present invention, the flexible joint body is inserted into a hole formed in the wall surface of the handhole, and an extension band is inserted into one end of the cylindrical portion to expand the end. The outer pipe and the sheath pipe are inserted from the other end, and the flexible joint and the outer pipe are fastened and fixed.Then, preferably, firmly fastened and fixed using a tightening band. The fixing plate and the sheath tube brought in from the inside of the handhole are fixed, and then the fixing plate is connected and fixed to a fixing plate mounting jig adhered to the flexible joint body by using a connecting member.

In the method, cement, mortar,
Since no adhesive is used, there is no need for drying or curing time, and the work can be done quickly, and there is no need to drill holes for fixing plates in the handhole. It is reduced.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a cross section of a fixed plate-integrated type flexible joint according to the present invention and a state in which the joint is attached to an outer tube and a sheath tube for accommodating a handhole and a communication cable. The diameter of the tubular portion of the flexible joint 6 is expanded and fixed by the extension band 7 inside the hole 2 provided in the side wall of the handhole 1. The fixing plate 10 has a shape in which a plurality of claws 11 are erected at positions along the circumference of the hole on the inner wall surface side of the hole 2 of the handhole 1. , A plurality of fixing plate mounting jigs 12 are adhesively fixed to the rubber joint main body 6.

FIG. 2 shows a perspective view of the extension band 7,
Since the engaging portion 8 has a so-called sawtooth shape, the diameter can be continuously increased, and a slight variation in the hole diameter can be absorbed.

By the above-described operation, the plurality of fixing plate mounting jigs 12 are firmly fixed between the flexible joint body 6 and the expansion band 7. Next, the fixing plate 10 is connected to the fixing plate mounting jig 12 using the connecting member 13.

Next, the outer tube 3 and the sheath tube 4 are inserted through the other end of the flexible joint body 6 and the sheath 5 is connected to the fixing plate 10 by the connector 5. Next, the flexible joint body 6
And the outer tube 3 are firmly fastened and fixed using the tightening band 9.

[0020]

The present invention is as described above, and has the following effects. In the fixed plate-integrated type flexible joint of the present invention, the fixed plate is subjected to a force applied to a cross section perpendicular to the axis of the outer tube by a plurality of claw portions provided on the fixed plate and in the same direction as the axis. With respect to the force, it is firmly fixed up, down, left, right, front and back by connecting through a connecting member to a fixing plate attaching jig bonded and fixed to the rubber joint body. Therefore, the flexible joint does not fall off even in the event of an earthquake, vibration of a vehicle, or the like, with the handhole and the outer pipe for storing cables and the like kept sufficiently watertight.
In addition, by fixing the fixing plate integrally with the flexible joint using the fixing plate mounting jig and its connecting member, there is no need to make a hole in the inner wall of the handhole and mount the fixing plate with an anchor plug or the like. In addition, the risk of infiltration of groundwater due to cracks can be reduced, and mounting workability can be greatly improved. Furthermore, by using an extension band having a so-called serrated specification for the engagement portion, it is possible to easily cope with a slight change in the hole diameter of the handhole, and the flexible joint can be firmly fixed to the handhole. it can.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a fixed plate integrated type flexible joint according to the present invention and a state diagram when the flexible joint is attached to a handhole.

FIG. 2 is a perspective view of an extension band.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Hand hole 2 Hand hole drilling 3 Outer tube of communication cable housing tube 4 Saya tube for storing communication cable 5 Connector 6 Flexible joint body 7 Expansion band 8 Expansion band engaging portion 9 Fastening band 10 Fixing plate 11 Fixation Plate claw portion 12 Fixing plate attaching jig 13 Fixing plate attaching connecting member 14 Water expanding rubber

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shunichi Arai 306 Koyagi-cho, Takasaki-shi, Gunma CRL K.K. Incorporated F term (reference) 3H019 DA02 DA09 3H104 JA07 JD09 KC02 KC09 LB09 LG02 LG22 5G369 AA06 BA04 BA06 DC03 DC04 DC09 DC14 DD02 EA01

Claims (4)

[Claims] 1. A flexible joint for connecting an outer tube for accommodating a communication cable and a handhole, wherein the outer tube-side tubular portion which is coaxially inserted into and fixed to the outer tube and a hole in the wall of the handhole. The joint body, which is coaxially connected and integrated with the handhole-side cylindrical part in contact with the surface, the extension band for fixing the joint body to the hole in the handhole wall, and the communication cable contained in the outer tube It is characterized by comprising a fixing plate having a plurality of claws at positions along a perforation circumference of a handhole wall surface for fixing a sheath tube to be stored, a fixing plate attaching jig adhered to a joint body, and a connecting member thereof. Flexible joint integrated with a fixed plate. 2. The extension band is a ring body in which engagement portions at both ends having a plurality of engagement positions are engaged with each other, and the engagement portion can slide through in the radial direction of the extension band. 2. The fixed plate-integrated type flexible joint according to claim 1, wherein the joint is reengaged at the position of the enlarged diameter after the slip-through, and the reduced diameter of the expansion band can be locked. 3. The fixed plate integrated type flexible joint according to claim 1, wherein a water-swelling rubber member is provided outside the cylindrical portion of the handhole side of the flexible joint. 4. A flexible joint body is inserted into a hole formed in a wall surface of a handhole, and an extension band is inserted into one end of a cylindrical portion of the body, and the end portion is enlarged in diameter and fixed to an inner wall surface of the handhole. A fixing plate in which an outer tube and a sheath tube are inserted from the end cylindrical portion to fasten and fix the flexible joint body and the outer tube, and then fix the fixing plate and the sheath tube, and then adhere the fixing plate to the flexible joint body. 2. The method according to claim 1, wherein the connecting member is connected to the mounting jig using a connecting member.