JP2000193139A - Protection pipe connection structure in hand hole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To connect a protection pipe for an optical fiber or a communication cable to a hand hole without slipoff. SOLUTION: A pipe holding plate 19 formed with pipe insertion holes 22 correspondingly to the number of pipings of protection pipes 6 is attached to the inside of a communication hole of a hand hole. A pipe fixation ring 25 composed of an inner ring 23 and an outer ring 24 is attached to the pipe insertion hole 22 of the pipe holding plate 19. A packing ring 7 attached to an end of the protection pipe 6 inserted through the pipe insertion hole 22 is engaged with the fixation ring 25 at its side of the inner ring 23. It is thus possible to prevent the protection pipe from slipping off from the pipe fixation ring 25 of the pipe holding plate 19.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure of a protective tube for cables in a handhole.

[0002]

BACKGROUND OF THE INVENTION In order to route cables such as optical fibers and communication lines, for example, a pipe groove is excavated on the side of a road, and hand holes are installed at predetermined intervals in the pipe groove, and between the hand holes. A configuration is adopted in which a protective tube is inserted and cables and the like are inserted into the protective tube.

[0003]

2. Description of the Related Art Conventionally, as shown in FIG.
Insert the joint (4A) from the outside into the communication port (3A) of (2A), and
(4A) is connected to a protection tube (6). The protective tube (6) is a corrugated flexible tube having a peak (6A) and a valley (6B), and the joint (4A) is connected to a communication port (3) of the handhole (2A).
A) The root (41A) inserted into the handhole (2A)
A receiving portion (42A) formed with an enlarged diameter on the outside of the housing, and the receiving portion (42A) has a packing ring at the valley (6B).
The protection tube (6) with (7) is inserted.

[0004]

In the above protective tube connection structure, the frictional force between the receiving portion (42A) of the joint (4A) and the packing ring (7) attached to the protective tube (6) is reduced. By protection tube
(6) is fixed to the joint (4A), but the packing ring (7) is easily deformed and the frictional force is not sufficient as a fixing force for the protective tube (6). 6) is the joint (4
There was a problem that it was easy to escape from A).

[0005]

According to the present invention, as a means for solving the above-mentioned conventional problems, a protection pipe (6) for cables is provided between handholes (2, 2). Attach a pipe holding plate (19) with a pipe insertion port (22) corresponding to the number of pipes of the protection tube (6) inside the communication hole (3) of the hand hole (2), and attach the pipe holding plate (19). Inner ring (23) at tube insertion port (22)
And a pipe fixing ring (25) consisting of an outer ring (24)
A handhole (2) in which a packing ring (7) attached to the end of the protective tube (6) inserted into the tube insertion port (22) is engaged with the inner ring (23) side of the fixing ring (25). The present invention provides a protective tube connection structure in the above. An end flange (28B) is formed on the inner ring (23), and a packing ring (7) of the protective tube (6) is engaged with an end flange (28B) of the inner ring (23). Preferably, the packing ring (7) of the protective tube (6) is engaged with the end of the inner ring (23). Further, in a preferred embodiment of the present invention, a joint (4) is attached to the communication port (3) of the handhole (2) from the outside, and the end of the outer pipe (5) is attached to the joint (4). A protective tube (6) focused by a nozzle (9) is inserted into the outer tube (5), and the protective tube (6) has a corrugated flexible shape. It is desirable that the protective tube is a protective tube.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to an embodiment shown in FIGS. 1 to 8. For example, a pipe groove (1) is excavated on a side of a highway, and a predetermined interval is formed in the pipe groove (1). A handhole (2) is set up. Contact hole for the handhole (2)
(3) has a fitting (4) inserted from the outside.
The end of the outer tube (5) is inserted into (4). The outer tube (5)
Consists of a corrugated outer pipe (5A) and a straight pipe-shaped inner pipe (5B) as shown in Fig. 3, and a packing ring (52) is attached to the valley at the end via a spacer (51). Have been.
In this way, the outer tube (5) is passed between the pair of hand holes (2, 2), and the protective tube (6) is provided in the outer tube (5). The pipe (6) is connected to the peak (6) as shown in FIG.
A) is a corrugated flexible tube having a valley (6B) and is cut to a predetermined length (for example, 5 m), and rubber packing rings (52) are provided at both valleys (6B). And a collar (8) is attached to one end.

A plurality of (for example, six) protective tubes (6) are bundled by a nozzle (9), and the nozzle (9) has a core plate (10) having an oval shape as shown in FIG. ), A lower outer frame (11) and an upper outer frame (12).
A total of six tube fitting recesses (13, 13, 13, 14, 14, 14) are formed, and three tube fitting recesses (1) are provided inside the lower outer frame (11).
5, 15, 15) are formed, the outer peripheral shape of which is adapted to the inner peripheral shape of the inner tube (5B) of the outer tube (5), and the inside of the upper outer frame (12) is Three tube fitting half-ring portions (16, 16, 16) are formed.

In order to bundle the six protective tubes (6) by the nozzle (9), the tube fitting recesses (13, 13, 13, 13, 14, 14, 1) of the core plate (10) are used.
Attach the protection tube (6) to each of 4) and then the lower outer frame
(11) and an upper outer frame (12) are fitted from above and below the core plate (10),
Insert the lower three protection tubes (6) into the lower tube fitting recesses (1) on the core plate (10).
3, 13, 13) and the pipe fitting recesses (15, 15, 15) of the lower outer frame (11), and the upper three protection tubes (6) are attached to the core plate (10). The lower tube (1) is sandwiched between the upper tube fitting recesses (14, 14, 14) and the tube fitting half-ring portions (16, 16, 16) of the upper outer frame (12), respectively.
The both ends of the upper frame (12) and the upper outer frame (12) are overlapped with screws (17) at the core plate (1
Stop at 0).

The bundle (18) of the protective tube (6) is inserted into the outer tube (5) from one hand hole (2), and a wire is inserted from the other hand hole (2) to form the bundle. (18) and connect the wire to the other handhole with a winch.
(2) pulling the bundle (18) to the outer tube (5)
As described above, the nozzle stub (9) of the present embodiment has a lower outer peripheral shape adapted to the inner peripheral shape of the inner tube (5B) of the outer tube (5). When the converging body (18) of the protective tube (6) is pulled into the outer tube (5) due to such a shape, slippage between the nozzle (9) and the inner tube (5B) of the outer tube (5) occurs. Become smoother,
It becomes easy to pull the protection tube (6) into the outer tube (5). And FIG.
As shown in the figure, the bundles (18) are connected to each other by connecting the protective tubes (6) via the collar (8).

As described above, the outer tube between the hand holes (2, 2)
(5) There are six protective tubes focused by the nozzle (9)
(6) is piped, but at the terminal, the end of the outer pipe (5) is inserted into the joint (4) of the handhole (2) as described above. As shown in FIGS. 6 and 7, inside the communication port (3) of the handhole (2), an iron pipe holding plate (1) is provided.
9) is mounted with bolts (20) and nuts (21).

The tube holding plate (19) is provided with six tube insertion openings (22) corresponding to the number of tube bundles of the bundle (18), and each tube insertion opening (22) has an inner ring. A pipe fixing ring (25) consisting of (23) and an outer ring (24) is attached. The inner ring (23) includes a flange (26) provided at an outer end of the main body, a groove (27) formed at an intermediate portion, and an outer threaded cylindrical portion (28) provided at an inner end of the main body. A thread groove (28A) is provided on the outer periphery of the outer screw cylinder (28), and an end flange (28B) is provided at the end. A protective tube (6) drawn from the outer tube (5) penetrates through the inner ring (23). As shown in FIG. 8, the inner ring (23) is inserted into the tube insertion port (22) of the tube holding plate (19) from outside the hand hole (2), and the screw of the inner ring (23) is screwed. An outer ring (24) is screwed into the cylindrical portion (28) inside the handhole (2). The outer ring (24) includes an inner threaded cylinder (29) and a reduced diameter cylinder (30) formed inside the inner threaded cylinder (29), and the inner threaded cylinder (29) A thread groove (29A) is provided in the inner periphery of the reduced-diameter cylindrical portion (30).
From the inner circumference of the outer end of the bell mouth part (3
1) is formed, and the bell mouth portion (31) is connected to the end of the protection tube (6), and the bell mouth portion (31) allows the cables to enter the protection tube (6). Easy insertion. Further, a packing ring attached to a valley (6B) between the ridges (6A) of the protective tube (6) is mounted on an end flange (28B) of the outer threaded cylinder (28) of the inner ring (23). By the engagement of (7), the end of the protection tube (6) is fixed by the outer ring (24). In this way, the packing ring (7) provides a flexible protective tube by the above-mentioned engagement, except that it provides sealing properties to the connection structure.
(1) Also keep the ends from coming off. The backfill of the pipe groove (1) can be performed after the outer pipe (5) has been inserted between the hand holes (2, 2), or after the protective pipe (6) has been installed in the outer pipe (5), or This is performed after arranging cables in the protective tube (6).

In this embodiment, the inner ring (23) is connected to the tube holding plate (19).
The inner ring (23) may be provided integrally with the tube insertion port (22).

FIGS. 9 to 11 show another embodiment.
As shown in FIG. 9, the pipe holding plate (32) of this embodiment includes a petri dish-shaped main body (33), a flange (34) extending outward from the upper peripheral edge of the main body (33), and a main body (33). 33) comprising a plurality of (six) inner rings (35) integrally provided in a plurality (six) of tube insertion ports (35A) provided on the base surface (33A) of the base plate (33A). Three
The flange (34) of (2) is provided with a plurality of bolt holes (33B), and a thread groove (35B) is formed on the outer periphery of the inner ring (35). The tube holding plate (32) is formed by, for example, inserting an inner ring (35) into an injection mold and then subjecting the main body (33) to injection molding.

As shown in FIG. 10, the pipe holding plate (32) has a connection port for the handhole (2) with the inner ring (35) forming side inside.
The joint (36) is inserted into the communication port (3) from the outside. An enlarged diameter receiving portion (37) is formed at an outer end portion of the joint (36), and a flange (38) is formed at a root end, and the flange (38) and the pipe holding plate ( Connect the flange (34) of (32) with the handhole (2)
Bolt (39) and stud nut (4)
0). Further, a bead shape (41) is formed on the outer periphery of the root end of the joint (36), and the bead shape (41)
Penetrates into the mortar filled in the communication port (3) of the handhole (2) to improve the mounting strength of the joint (36).

An outer ring (42) is screwed to the outside of the inner ring (35) of the tube holding plate (32). A step (43) is provided at an intermediate portion of the inner periphery of the outer ring (42). And a bell mouth portion (44) is formed at the root end from the step portion (43). The inner ring (35) of the tube holding plate (32) and the outer ring (42) constitute a tube fixing ring (45).

An outer pipe (5) is inserted into the joint (36).
The outer tube (5) is a corrugated outer tube as shown in FIG.
(5A) and a straight pipe-shaped inner pipe (5B), and a plastic spacer (51) such as polypropylene at the valley at the end.
A rubber packing ring (52) is mounted via the. And inside the outer tube (5) is the same nozzle (9) as in the previous embodiment.
A plurality of protective tubes (6) converged by a pipe are provided, and the protective tubes (6) are drawn out of the outer tube (5), and the ends thereof are connected to the tube holding plate as shown in FIG. (32) Tube insertion port
It penetrates the inner ring (35) through (35B). The inner ring (35) is connected to the outer ring from the inside of the handhole (2).
(42) is screwed. And the valley (6B) of the protection tube (6)
The packing ring (7) attached to the inner ring (35)
And the outer ring (42) is engaged by being pinched between the end face of the outer ring (42) and the step (43) on the inner periphery of the outer ring (42). The end of the protection tube (6) is prevented from falling off.

In the present invention, the main body of the tube holding plate is made of plastic such as polyethylene or polypropylene, the inner ring is made of plastic such as nylon, and the outer ring is made of plastic such as polypropylene.

In this embodiment, the inner ring (35) is connected to the tube holding plate (32).
Although it is provided integrally with the tube insertion port (35B), the inner ring may be separately attached to the tube insertion port (35B) as in the previous embodiment.

The present invention is not limited to the above embodiment, and the outer tube need not be flexible if it is a straight pipe.

[0020]

[Operation and Effect] As described above, the present invention provides a pipe fixing ring (25) in which the packing ring (7) attached to the end of the protective tube (6) is attached to the pipe insertion port (22) of the pipe holding plate (19). ), The end of the protective tube (6) is connected to the handhole (2) without falling off via the tube fixing ring (25) of the tube holding plate (19). You.

[Brief description of the drawings]

 1 to 8 show one embodiment of the present invention.

FIG. 1 is an explanatory diagram of a protective tube piping structure.

FIG. 2 is a side view of the protection tube intermediate portion omitted.

FIG. 3 is a partial side sectional view of an outer tube.

FIG. 4 is a front view of a nozzle.

FIG. 5 is a side view of a pipe connection part.

FIG. 6 is an explanatory perspective view of a pipe terminal part.

FIG. 7 is a side view of a pipe terminal part explanation.

FIG. 8 is an explanatory sectional view of a pipe terminal part. FIGS. 9 to 11 show another embodiment of the present invention.

FIG. 9 is a perspective view illustrating a protection plate.

FIG. 10 is an explanatory side view of a piping terminal.

FIG. 11 is an explanatory sectional view of a pipe terminal part.

FIG. 12 is a side sectional view of a connection portion between a conventional handhole and a protection tube.

[Explanation of symbols]

 2 Hand hole 3 Connection port 4 Fitting 5 Outer tube 6 Protective tube 7 Packing ring 9 Stub 19,32 Tube holding plate 22 Tube insertion port 23,35 Inner ring 24,42 Outer ring 25,45 Fixing ring 28B End flange

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] October 22, 1999 (1999.10.
22)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0015

[Correction method] Change

[Correction contents]

[0015] (42) is the outer ring that is screwed on the outside the inner ring (35) of the tube holding plate (32), the inner circumference of the outer ring (42)
Is formed with a thread groove (42A), and a step (43)
A bell mouth portion (4) is formed at the root end from the step portion (43).
4) is formed. And the inner ring (3
5) and the outer ring (42) constitute a pipe fixing ring (45).

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG. 11

Claims (7)

[Claims] 1. A structure in which a protective tube for cables and the like is provided between handholes.
Attach a tube holding plate with a tube insertion port corresponding to the number of pipes of the protective tube, attach a tube fixing ring consisting of an inner ring and an outer ring to the tube insertion port of the tube holding plate, and insert it through the tube insertion port. And a packing ring attached to an end portion of the protection tube engaged with an inner ring side of the fixing ring. 2. The protection tube according to claim 1, wherein an end flange is formed on the inner ring, and a packing ring of the protection tube is engaged with the end flange of the inner ring. Connection structure 3. The protection tube connecting structure for a handhole according to claim 1, wherein a packing ring of the protection tube is engaged with an end of the inner ring. 4. The protection tube connecting structure for a handhole according to claim 1, wherein said inner ring is separately attached to a tube insertion opening of said tube holding plate. 5. The protection tube connection structure for a handhole according to claim 1, wherein said inner ring is provided integrally with a tube insertion port of said tube holding plate. 6. A joint is attached to the communication hole of the handhole from the outside. An end of an outer tube is inserted into the joint, and a protective tube focused by a nozzle in the outer tube. The protection tube connection structure in a hand hole according to any one of claims 1 to 5, which is inserted. 7. The protection tube connection structure for a handhole according to claim 1, wherein said protection tube is a flexible protection tube having a corrugated shape.