JP3286616B2 - Joint for connecting the telecommunication cable housing tube and the handhole - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint for connecting an optical cable or the like used for information communication and the like to a rectangular handhole.

[0002]

2. Description of the Related Art As shown in FIG. 7, for example, a conventional connecting joint inserts a short pipe 34 having a flange 33 at an end into a drilled hole 32 of a square hole (hand hole) 31. And a plurality of protective tubes (not shown) disposed therein are connected to the short tube 34 by adjusting the length, and the protective tube is fixed to the fixing plate 36 using a connector (not shown) or the like. The flange 33 of the short pipe 34 and the fixing plate 36 are connected and fixed with bolts 37 or the like.
Thereafter, the position of the outer tube 35 is adjusted, and mortar or concrete 38 is poured around the short tube 34 subjected to sanding 39, and then hardened.
Is fixed to the handhole 31.

However, in the conventional fixing by mortar or concrete wrapping as shown in FIG. 7, cracks are likely to occur in the mortar or concrete joint due to uneven settlement of the ground or an earthquake, and groundwater or accumulated water enters from these cracks. And may cause water leakage. Also, even if displacement occurs in the pipe due to an earthquake etc., it cannot follow the displacement,
As a result, the pipe may fall out of the rectangular hole, and groundwater may enter from the escaped part and cause water leakage.

[0004] Since an information transmission conduit for accommodating an optical cable or the like is usually buried along a national road or a general road with heavy traffic, it is desirable to finish the laying work as soon as possible and restart traffic. However, when casting mortar or concrete, the mortar or concrete cannot be backfilled until it is completely hardened, which has the disadvantage of lengthening the construction period, and is specialized in the construction and management of mortar or concrete. It also requires skills. There is also a problem that it is difficult to fix the tube and the square hole accurately.

[0005] For this reason, it is conceivable to use a flexible joint at the joint between the outer tube and the square hole. However, the expansion band inside the joint is expanded and pressed against the drilled surface of the square hole. Since it is an installation method for fixing with water stoppage, it is necessary to make the drilled hole circular and control its diameter to about ± 2 mm.

Further, an adhesive type flexible joint which can be attached without being affected by the shape and precision of the drilling diameter is also conceivable. However, the flexibility makes it difficult to fix the outer tube. When drilling by breaking the wall of the hole, the drilling cross section will be uneven, so even if you try to adjust the position of the pipe by filling spacers and wedges between the pipe and the drilling surface, accurate positioning There is a problem that is difficult.

[0007]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems and prevents water leaks caused by cracking or disconnection of the information communication cable accommodating pipe and the rectangular hole at the connecting portion. The present invention also proposes a joint for connecting an information communication cable housing pipe and a square hole, which can accurately align the pipe and the square hole.

[0008]

In order to solve the above-mentioned problems, a joint for connecting an information communication cable accommodating pipe and a handhole according to the present invention includes a wall-joint type flexible joint, A fixing plate for fixing the outer tube and the protection tube of the housing tube, and a fixing plate mounting device for fixing the fixing plate to the handhole, wherein the wall-bonded flexible joint is made of an elastic material, A flange portion adhered to a periphery of a drilled portion outside the handhole; and a cylindrical portion that is coaxially inserted into and fixed to the outer tube of the housing pipe, wherein the fixing plate attaching device is configured to drill the drilled hole of the handhole. A donut-shaped rigid flat plate having an outer tube through-hole, which is included in the inner peripheral portion of the flange portion of the flexible joint around the portion, and the donut-shaped outer portion, which is arranged around a drilled portion inside the handhole. At the position corresponding to the flat plate, To the presser frame plate rigid with said donut-shaped flat plate and the connecting bolts to connecting the pressing frame plate to fasten across the wall near the drilling unit comprising,
The fixing plate is attached and fixed to a protection tube through hole of the holding frame plate, and connects and fixes the protection tube inserted into the outer tube.

That is, the connecting joint according to the present invention can cut a donut-shaped flat plate of a fixed plate mounting device even if the mounting position is a rough hole formed by dividing the wall of a handhole with a hammer or the like. To fit the outside of the hole and connect it with the holding frame plate inside the hole at the corresponding position of the donut-shaped flat plate with bolts, and tighten and fix the bolt with the wall around the hole part sandwiched between two plates In addition, the fixing plate mounting device can sufficiently support the weight of the outer tube accommodating the protective tube without being affected by the shape and precision of the drilled hole.

The wall-joint-type flexible joint of the joint for connection according to the present invention is fixed to the outer periphery of the drilled portion and includes the donut-shaped flat plate with a flange portion. By adhering to the wall surface with an adhesive or the like, intrusion of groundwater or the like can be prevented. At this time, excellent watertightness is exhibited by using, for example, a butyl rubber-based adhesive as the adhesive.

The outer tube is inserted into the cylindrical portion of the flexible joint. Watertightness can be obtained by tightening and fixing the vicinity of the insertion opening of the cylindrical portion with a fastening band made of stainless steel or the like. The end of the protective tube housed inside the outer tube is fixed to a fixing plate by a connector etc. By fixing this fixing plate to the holding frame plate with bolts etc., both the outer tube and the protecting tube can be securely mounted in the square hole Therefore, even if displacement occurs due to an earthquake or the like, watertightness can be maintained. In addition, since no mortar or concrete is used, there is no need to wait for the hardening time.

Further, the connection joint according to the present invention is characterized in that the flexible joint has a displacement absorbing portion for absorbing the displacement of the outer tube. Therefore, even when the displacement of the cable housing pipe occurs due to an earthquake or the like, the joint itself follows and absorbs the displacement, so that the watertightness of the connection between the housing pipe and the handhole can be maintained. The displacement absorbing portion has, for example, a bellows shape or a semicircular shape.

[0013]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a perspective view showing an embodiment of the present invention. Outer tubes 2, 2 ′ accommodating a protective tube (not shown) for protecting an optical fiber cable and the like are connected and fixed to a hole of the square hole 1 by a wall-joint type flexible joint 3. Although not shown in the drawing, the outer tube 2 'is also fixed to the square hole 1 by a flexible joint 3'.

FIG. 2 is a longitudinal sectional view showing a state where the rectangular hole 1 shown in FIG. 1 is buried in the ground. Two outer tubes 2, 2 'are connected to the side walls 1A, 1A' of the rectangular hole 1 via wall-joined flexible joints 3, 3 ', respectively. 4 'and fixing plates 5, 5' fixed to the holding frame plates 4, 4 ', respectively. The wall-attached flexible joints 3 and 3 ′ are respectively provided with an adhesive,
For example, it is adhered to the wall surfaces 1A, 1A 'of the hole 1 via butyl rubber-based adhesives 6, 6'.

FIG. 3 is a sectional view showing a joint according to the present invention and the vicinity thereof. The illustrated holding frame plate 4, a donut-shaped flat plate 7 which is arranged so as to sandwich a hole 6 provided in the side wall of the handhole 1, and a connecting bolt 8 for connecting the same are used to attach the fixing plate 5 to the handhole 1. Form a fixed plate mounting device. Donut-shaped flat plate 7 has outer tube 2
The fixing plate mounting device can be mounted at a position where the outer tube 2 of the handhole 1 is to be mounted by adjusting the position of the fixing plate mounting device.

The fixing plate 5 is fixed to the holding frame plate 4 by bolts 9. The fixing plate 5 is provided with a connector 11 for connecting to and fixing a number of cable protection tubes 10 housed in the outer tube 2. These connectors 11
Are inserted into a number of connector mounting holes provided in the fixing plate 5.

The water stopping flexible joint 3 includes a first cylindrical portion 12 (flange portion), a second cylindrical portion 13, and a bellows portion provided therebetween.
Consists of fourteen. The first cylindrical portion 12 is adhered by a water-stopping material having an adhesive property, for example, a butyl rubber-based adhesive material 15 so as to cover the hole 6 in the outer wall of the handhole 1. On the other hand, the second cylindrical portion 13 is fastened with the fastening band 16 together with the outer tube 2 inserted into the joint. The second cylindrical portion 12 and the outer tube 2
A water-stop material having an adhesive property, for example, a butyl rubber-based pressure-sensitive adhesive material 17 is interposed therebetween.

The water-stop flexible joint 3 can be formed from a material having various elasticities. Such an elastic body can be selected from synthetic rubber such as styrene-butadiene rubber, EPDM, and chloroprene, natural rubber and soft vinyl chloride resin, and thermoplastic elastomers such as olefin and styrene. The material of the donut-shaped flat plate 7, the holding form 4, the fixing plate 5, the connecting bolt 8, and the fastening band 16 which require rigidity include metals such as stainless steel, aluminum, rust-proof plated steel, and rust-proof coated steel plate. Alternatively, a hard plastic such as a vinyl chloride resin, an ABS resin, or FRP can be used. These materials are particularly desirable because they are hardly corroded.

FIG. 4 is a view from the outside of the handhole 1.
It is a front view of the joint for connection by this invention. As described above, the water stopping flexible joint 3 is adhesively fixed to the outer wall so that the first cylindrical portion 12 covers the hole 6 of the handhole 1. The outer tube 2 is inserted into the second cylindrical portion 13 of the flexible joint 3 and is fastened and fixed by a fastening band 16. In the illustrated example, nine cable protection tubes 10 are accommodated in the outer tube 2, but the number of the protection tubes 10 can be increased or decreased as necessary.

FIG. 5 is a front view of the joint 3 shown in FIG. As described above, the holding frame plate 4 is fastened and fixed together with the donut-shaped flat plate 7 with the connecting bolt 8 sandwiching the wall of the handhole 1.
A fixing plate 5 is detachably fixed to the holding frame plate 4 by support bolts 9. The fixed plate 5 has a cable protection tube 10
Are fixed by the connector 11, but as described above, the fixing plate 5 is detachable, so that inspection and repair of cables and the like can be easily performed. When it is desired to correct the position of the outer tube 2 after the installation is completed, the position of the outer tube 2 can be corrected by loosening the connecting bolt 8 and shifting the holding frame 4.

FIG. 6 is a front view of the fixing plate mounting device.
As described above, the donut-shaped flat plate 7 is connected to the connecting bolt 8.
To the holding frame plate 4.

As described above, according to the joint for connection between the information communication cable housing pipe and the handhole according to the present invention, cracks occur at the connection between the box pipe and the handhole, or the pipe comes off, etc. It is possible to prevent water leakage and accurately align the box piping with the handhole.

Further, since the connecting joint according to the present invention has a structure capable of absorbing the displacement of the outer pipe, even if the displacement of the outer pipe occurs, it follows and absorbs the displacement. The watertightness of the connection between the and the handhole is maintained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state in which a handhole to which an information communication cable housing pipe shown in FIG. 1 is connected is buried underground.

FIG. 3 is a sectional view showing details of a connection joint according to the present invention.

FIG. 4 is a front view of the connection joint according to the present invention as viewed from the outside of the handhole.

FIG. 5 is a front view of the connection joint according to the present invention as viewed from the inside of a handhole.

FIG. 6 is a front view of a fixing plate mounting device for a connection joint according to the present invention.

FIG. 7 is a cross-sectional view showing an example of a conventional connection joint.

[Explanation of symbols]

 1,31 Hand hole 2,35 Telecommunication cable housing tube (outer tube) 3 Waterproof flexible joint 4 Holding frame plate 5,36 Fixing plate 6,32 Hand hole drilling 7 Donut-shaped flat plate 8 Connecting bolt 9 Bolt 10 Cable protection tube 11 Connector 12 First cylindrical part (flange) of joint 3 13 Second cylindrical part of joint 3 14 Bellows part of joint 3 15,17 Butyl rubber-based adhesive 16 Fastening band 33 Flange 34 Short pipe 37 Bolt 38 Mortar 39 Sanding

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-152318 (JP, A) JP-A-9-182267 (JP, A) JP-A-11-18262 (JP, A) 49488 (JP, U) Japanese Utility Model Hei 6-21335 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02G 9/10 E02D 29/12 F16L 5/00 F16L 5/02

Claims (4)

(57) [Claims] 1. A joint for connecting an information communication cable accommodating pipe for accommodating an information communication cable and a handhole for connecting a plurality of said pipes to each other, comprising: a wall-joint-type flexible joint; A fixing plate for fixing the outer tube and the protection tube of the tube, and a fixing plate attaching device for fixing the fixing plate to the handhole, wherein the wall-bonded flexible joint is made of an elastic material,
A flange bonded to the periphery of the hole outside the hand hole,
A cylindrical portion which is coaxially inserted into and fixed to the outer tube of the housing tube, and wherein the fixing plate attaching device is provided around a drilled portion of the hand hole and an inner peripheral portion of a flange portion of the flexible joint. A doughnut-shaped rigid flat plate having an outer tube through-hole included, and a rigid plate having a protective tube through-hole at a position corresponding to the outer donut-shaped flat plate disposed around the drilled portion inside the handhole. A presser frame plate, and a connecting bolt for connecting the donut-shaped flat plate and the presser frame plate to each other and tightening and fixing the wall around the drilled portion, wherein the fixing plate is a protective tube of the presser frame plate. A joint for connecting an information communication cable housing tube and a handhole, wherein the joint is attached and fixed to a through-hole and fixedly connected to a protective tube inserted into the outer tube. 2. The information communication cable housing pipe and hand according to claim 1, wherein the wall-bonded flexible joint has a displacement absorbing portion for absorbing a displacement of the outer pipe. Fitting for connection with the hole. 3. The joint according to claim 2, wherein the displacement absorbing portion has a bellows shape. 4. The joint according to claim 2, wherein the displacement absorbing portion has a semicircular shape.