JP2000120926A - Piping work method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly pull a flexible protective pipe inside an outer pipe without using any roller or carriage by forming at least a pipe base part in the flexible protective pipe into a lower outer circumference shape matching the inner circumference shape of the outer pipe when the flexible pipe is pulled into the outer pipe from a hand hole. SOLUTION: Hand holes 17 are arranged at predetermined intervals inside a pipe groove 16 so as to be connected to each other via an outer pipe 20. On the other hand, a plurality of flexible protective pipes 1 with a unit length are converged in a pipe base so as to be formed into a unit pipe converging body 15 having the lower outer circumference shape matching the inner circumference shape of the outer pipe 20 in the base part. A wire 26 inserted from the hand hole 17 on one end side is hooked on the front end part of the unit pipe converging body 15 so as to be pulled into the outer end side, and to the rear end of the unit pipe converging body 15 in the most front side, the front end of the second unit pipe converging body 15 is connected. Sequentially, the following unit pipe converging bodies 15 are pulled to the other end side in a similar manner, while the unit pipe converging bodies 15 from the third one are connected to each other similarly, and consequently, the flexible protective pipe 1 is arranged in the outer pipe 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of piping a flexible protective tube for covering and protecting an optical fiber, a communication cable and the like in an outer tube installed in a piping groove.

[0002]

BACKGROUND OF THE INVENTION When laying cables such as optical fibers and communication cables on the side of a road or the like, a pipe groove is first dug, and a handhole is installed at a predetermined interval in the pipe groove. Whether the pipe groove is backfilled after connecting the hand holes with an outer pipe, or the pipe groove is filled back after inserting a plurality of flexible protective tubes such as corrugated pipes from the handhole into the outer pipe. Alternatively, a method of inserting cables such as an optical fiber and a communication cable into the flexible protective tube and then refilling the piping groove is employed.

[0003]

2. Description of the Related Art Conventionally, as shown in FIG. 18, a plurality of (for example, six) flexible protective tubes (1) are inserted into an outer tube (20) inserted between hand holes (17). A plurality of the reels (60) of the flexible protective tube (1) are set on the ground, the flexible protective tube (1) is pulled out from the reel (60), and the outer tube is inserted through one hand hole (17). The flexible protective tube (1) is inserted into (20), and the wire (26) inserted from the other hand hole (17) is inserted into the flexible protective tube (1).
And the flexible protective tube (1) is pulled by the winch (29) toward the other handhole (17) in the outer tube (20).

[0004]

In such a conventional method, in order to simultaneously pull in the six flexible protective tubes (1) into the outer tube (20), six large reels (60) are placed on the ground. It must be installed, and a large construction site on the ground must be secured. In the case of construction on the side of the road, there is also a problem of traffic regulation. In order to avoid such problems, it is necessary to divide the six flexible protective tubes (1) into three parts and carry out the work twice, and such work is very difficult. It takes time and effort.

When the flexible protective tube (1) is pulled into the outer tube (20), the flexible protective tube (1) expands due to tension. In this method, the end of the flexible protective tube (1) was pulled out longer, cut, left to stand for about one day, and waited for it to shrink, then trimmed again.However, this method requires time and effort. Purimita flexible protection tube
(1) The scraps increase and the material is wasted.

Further, a flexible protective tube drawn from the reel (60)
Since (1) has a curl, there is also a problem that when inserted into the outer tube (20), the flexible protective tube (1) undulates and interferes with the handhole and the outer tube, which makes it difficult to retract.

[0007]

According to the present invention, as a means for solving the above-mentioned conventional problems, a handhole (17) is provided at a predetermined interval in a pipe groove (16), and the handhole (1) is provided.
7) is communicated with the outer tube (20), while the flexible protective tube of unit length (1)
Unit pipe bundle having a lower outer peripheral shape which is converged from the nozzle (3,3) at least at both ends and at least at the nozzle (3,3) portion is adapted to the inner peripheral shape of the outer tube (20) Body (15), and a handhole (17) at one end of the first unit tube bundle (15)
The wire (26) inserted into the outer tube (20) from the hand hole (17) at the other end is hooked on the front end of the unit tube bundle (15), and pulled into the other end side. The first unit tube bundle (1
5) Connect the front end of the second unit tube bundle (15) to the rear end,
Thereafter, the unit tube bundle (15) is successively drawn into the other end side.The third and subsequent unit tube bundles (15) are connected in the same manner, and the flexible protective tube (1) is inserted into the outer tube (20). And a piping method for piping. In this case, it is desirable that the outer tube (20) has a circular cross section and the inner periphery is smooth. In addition, it is preferable that an elongation preventing wire (a linear body for preventing elongation) (21) is passed between the nozzles (3, 3) at both ends of the unit tube bundle (15). It is preferable that a retaining wire (retaining means) (30) is provided on an interconnecting portion of the unit tube bundle (15). In this case, the retaining wire (retaining means) (30) is extended between the elongation preventing wires (linear body for preventing elongation) (21), or (Retaining means) (30) is desirably provided between the nozzles (3, 3). Further, in the piping terminal, a pipe holding plate (31) having a plurality of pipe insertion ports (34) is attached inside the communication port (18) of the hand hole (17), and the pipe holding plate (31) is An inner ring (35) is attached to each of the tube insertion ports (34), and ends of the flexible protective tubes (1) are inserted inside the inner rings (35), respectively. An outer ring (39) is screwed from inside the handhole (17), and a bell mouth (42) inside the outer ring (39) is connected to an end of the flexible protective tube (1). It is desirable.

The present invention will be described with reference to an embodiment shown in FIGS. 1 to 11. The flexible protective tube (1) shown in FIG. 1 has an effective length of 5 m, and the flexible protective tube (1) has an effective length of 5 m. Collar (2) at rear end
Are fitted from one end, and six at the top and bottom are bundled by the nozzle (3) at both ends and the center.

As shown in FIG. 2, the nozzle (3) comprises a core plate (5), a lower outer frame (6), and an upper outer frame (7). ) Is formed with a total of six pipe fitting recesses (8A, 8B, 8C, 9A, 9B, 9C), three each from the lower edge and the upper edge, and 3 inside the lower outer frame (6). The pipe fitting recesses (10A, 10B, 10C) are formed, and the outer shape thereof is adapted to the inner shape of the outer tube (20) described later, and the upper outer frame (7) Three tube fitting semi-annular portions (11A, 11B, 11C) are formed on the inside, and a wire through hole (12, 1) for elongation prevention is formed in the core plate (5).
2) is provided as a pair of left and right.

[0010] Six flexible protective tubes (1) are provided by the nozzle (3).
As shown in FIG. 3, a flexible protective tube (1) is fitted into each of the tube fitting recesses (8A, 8B, 8C, 9A, 9B, 9C) of the core plate (5), as shown in FIG. Next, the lower outer frame (6) and the upper outer frame (7) are
(5), and the lower three flexible protective tubes (1) are fitted to the lower tube fitting recesses (8A, 8B, 8C) of the core plate (5) and the lower outer frame (6). ) And the upper three flexible protective tubes (1) are sandwiched between the tube fitting recesses (10A, 10B, 10C) of the core plate (5).
(9A, 9B, 9C) and the pipe fitting half-ring part (11A, 11B, 11) of the upper outer frame (7).
C), and the both end overlapping portions of the lower outer frame (6) and the upper outer frame (7) are fixed to the core plate (5) with screws (13).

As shown in FIG. 4, both ends of the collar (2) are slightly enlarged, and an engaging projection ring (2A) is formed inside the center. The flexible protective tube (1) is a corrugated tube in which convex ring portions (1A) and concave groove portions (1B) are alternately formed.
A packing ring (14) is attached to the concave groove (1B) at the end of (1), and the end of the flexible protective tube (1) is cut so as to bisect the convex ring (1A). The end of the flexible protective tube (1) is inserted into the collar (2) until the end surface of the flexible protective tube (1) comes into contact with the central engaging projection (2A) of the collar (2). The collar (2) is fixed to the flexible protective tube (1) by the frictional force between the packing ring (14) of (1) and the inner wall of the collar (2). The packing ring (14) is tightly attached to the inner wall of the collar (2) as described above to provide a sealing property to the connection structure, and the frictional force also moves the flexible protective tube (1) into the collar (2). It also serves to fix it.

[0012] Even if a large number of such unit pipe bundles (15) are accumulated at the construction site, they take up little space and hardly hinder traffic at the side of the road. For example, a pipe groove (16) is dug as shown in FIG. 5 on the side of the highway, and a hand hole (17) is provided at a predetermined interval in the pipe groove (16). The joint (1) is connected to the contact (18) of (17).
The root end of 9) is inserted and fixed, and one hand hole (1
Between the handhole (7) and the other handhole (17), a flexible outer tube (20) having a circular cross section, which is a corrugated tube, is inserted, and both ends of the joint (19) of both handholes (17). ). The outer tube (20) has a double structure consisting of an outer tube (20C) and an inner tube (20D) as shown in FIG.
0C) has a convex ring portion (20A) and a concave groove portion (20B), but no irregularities are formed on the inner tube (20D), and the inner periphery is smooth. In this state, the pipe groove (16) may be backfilled.

As shown in FIG. 5, the most advanced one of the unit tube bundles (15) is connected to one of the hand holes (17) through the outer tube.
Inserted in (20). In that case, the unit tube bundle (15)
As shown in FIG. 7, an elongation preventing wire (21) is inserted between the nozzles (3, 3) at both ends of the wire. As shown in FIG. 8, both ends of the extension preventing wire (21) are connected to the wire loop through holes (1) of the nozzles (3, 3) at both ends.
2) Penetrated and folded in two on the outside, metal locking collar
(22), and caulking the locking collar (22)
Lock and fix both ends of (21) to the nozzle (3,3).

The state-of-the-art unit tube bundle (15) includes pulleys (23, 2).
4) and the slide chute (24A) are introduced into the handhole (17) and the outer tube (20) from the ground via the slide chute (24A). Ingredient
A wire (26) inserted from the other handhole (17) is connected via (25), and the wire (26) is guided by pulleys (27, 28) in the other handhole (17), It is wound on a winch (29).

A state-of-the-art unit tube bundle as described above
(15) is drawn into the outer tube (20) by pulling the wire (26) by the winch (29), but the unit tube bundle (1
The front end of the second unit tube bundle (15) is connected to the rear end of 5). In this case, as shown in FIG. 9, the second unit tube bundle (15) from the other end of the collar (2) at the rear end of the flexible protective tube (1) of the state-of-the-art unit tube bundle (15) The distal end of the flexible protective tube (1) is inserted. The collar (2) and the flexible protective tube (1) are fixed to each other by the frictional force of the packing ring (14) of the flexible protective tube (1) at the connecting portion of the unit tube bundle (15) as described above. However, as shown in FIGS. 7 and 8,
The rear end of the wire for preventing elongation of the state-of-the-art unit tube bundle (15) (21) and the wire for preventing elongation of the second unit tube bundle (15) (21)
A retaining wire (30) is inserted between the end of the wire.

As shown in FIG. 8, the retaining wire (30) is co-attached to the locking collar (22) of the elongation preventing wire (21). That is, the end of the retaining wire (30) is folded in half and inserted into the locking collar (22) attached to the folded end of the elongation preventing wire (21), and the locking collar is inserted. When crimping (22), the wire (30) for retaining is locked and fixed together with the wire (21) for preventing elongation.

In this manner, the unit pipe bundles (15) are successively connected, and the six flexible protective tubes (1) are bundled together and drawn into the outer tube (20) from the handhole (17). At this time, the lower outer peripheral shape of the nozzle (3) of the unit pipe bundle (15), that is, the outer peripheral shape of the lower outer frame (6) conforms to the smooth inner peripheral shape of the outer pipe (20). Because it is a shaped, without using rollers, trolleys, etc.
The unit tube bundle (15) smoothly slides on the outer tube (20).

As described above, six flexible protective tubes (1) are piped into the outer tube (20) between the handholes (17, 17). The end of () is inserted into the joint (19) of the handhole (17). 10 and 11 are provided inside the communication port (18) of the handhole (17).
As shown in the figure, an iron pipe holding plate (31) is attached by bolts (32) and nuts (33).

The tube holding plate (31) has six tube insertion ports (34) corresponding to the unit tube bundles (15).
4) is provided with an inner ring (35). The inner ring (3
5) comprises an outer flange (36), an inner flange (37), and an outer threaded cylinder (38) provided inside the inner flange (37), and the inner ring (35) has an outer pipe ( The flexible protective tube (1) drawn out from 20) is penetrated. As shown in FIG. 12, on the outside of the inner ring (35), an outer ring (39) is screwed to the outer threaded tube portion (38) from the inside of the handhole (17). The outer ring (39) includes an inner threaded cylinder (40) and a reduced diameter cylinder (41) formed inside the inner threaded cylinder (40). A bell mouth portion (42) is formed from the inner periphery of the outer end toward the inner screw tube portion (40), and the bell mouth portion (42) is connected to the end of the flexible protective tube (1). In this state, the bell mouth portion (42) facilitates insertion of cables into the flexible protective tube (1). Further, an end flange (38A) of the outer threaded cylindrical portion (38) of the inner ring (35) is mounted on a concave groove portion (1B) between the convex ring portions (1A) of the flexible protective tube (1). By engaging the packing ring (14), the end of the flexible protective tube (1) is fixed by the outer ring (39). In this way, the packing ring (14) not only gives the sealing structure to the connection structure but also prevents the end of the flexible protective tube (1) from coming off by the above-mentioned engagement. The backfill of the pipe groove (16) is performed as described above for the outer pipe.
This may be performed after disposing the flexible protective tube (1) in (20), or after disposing cables in the flexible protective tube (1). The above examples do not limit the invention.

FIGS. 13 and 14 show another embodiment of the nozzle.
(47) is shown. The nozzle (47) includes a main body (48) and the main body (48).
Three lower pipe fitting recesses (49A, 49A)
B, 49C) and three upper tube fitting recesses (50A, 50B, 50C), and the upper and lower central tube fitting recesses (49B, 50B) are connected via a communication groove (51).

The pipe fitting recesses (49A, 49B, 49C, 50) of the nozzle (47) are provided.
A, 50B, and 50C) are each fitted with a flexible protective tube (1) as shown in FIG. 14, and a band (52) is wound around the outer periphery thereof. Secured by tightening through the other end to 53). Further, the body (4
8) is provided with through holes (54, 54, 55, 55) through which the extension preventing wire and the retaining wire are inserted. In a state where the six flexible protective tubes (1) are focused on the nozzle (47), as shown in FIG. 14, the lower outer peripheral shape has a shape that matches the inner peripheral shape of the outer tube (20). Have been.

FIG. 15 shows a stopper (43). The detachment prevention tool (43) is made of synthetic resin or metal, and an engaging piece (45) having a cross-sectional arrow shape is protrudingly provided at the upper and lower ends of the rectangular tubular body (44), and the engaging piece ( 45) Flange at root end
(46) is provided.

As shown in FIG. 16, the stopper (43) engages the engaging piece (45) of the flange (46) with the mounting hole (12A) of one of the nozzles (3). The two nozzles (3) are connected by penetrating and engaging the engaging piece (45) on the opposite side of the flange (46) into the mounting hole (12A) of the other nozzle (3). To prevent slipping out. Instead of the stopper (43), the nozzles may be connected to each other with a wire, tape or the like to prevent the stopper. However, when the nozzles are connected to each other in this way to prevent the nozzles from falling off, the load on the nozzles is applied to the unit for preventing the nozzles from being pulled out during the retracting operation of the unit pipe bundle (15).
When the wires for preventing elongation are connected to each other as in the previous embodiment, the load on the nozzle to be applied to the slip-out preventing means is not superimposed and applied, and only the load of one nozzle is applied to the nozzle. This is a desirable configuration in which the load on the nozzle is greatly reduced.

FIG. 17 shows another embodiment of the pipe connection. In this embodiment, a receiving portion (56) is formed instead of a collar at one end of one of the flexible protective tubes (1), and the receiving portion (56) of the flexible protective tube (1) is formed at the receiving portion (56). The other packing ring (1
The end of the flexible protective tube (1) to which (4) is attached is inserted.

Further, in the above embodiment, a flexible tube is used as the outer tube. However, if there is no bend between the hand holes, a non-flexible straight tube may be used. In addition, wire for preventing elongation and flexible protective tube
Instead of the wire for drawing in (1), another linear body such as a rope, a tape, or a string may be used. The flexible protective tube and the outer tube of the present invention are made of a synthetic resin having a low coefficient of friction such as polyethylene and polypropylene, and the nozzle is made of a synthetic resin such as polypropylene, polyethylene and ABS resin. The synthetic resin may be a recycled product.

[0026]

[Function / Effect] When the flexible protective tube (1) is drawn into the outer tube (20) from the hand hole (17), at least the nozzle portion of the flexible protective tube (1) has the outer tube (20). Since the lower outer peripheral shape is adapted to the inner peripheral shape, the flexible protective tube (1) can be smoothly pulled inside the outer tube (20) without using a roller or a truck. Therefore, a small pulling power is required, and there is no possibility of breakage of a wire or the like for pulling.

Since a plurality of flexible protective tubes (1) having a unit length are bundled together, a predetermined number of flexible protective tubes (1) are
0) It can be piped inside and can also be curled up, facilitating pipe retraction work. It does not take up space even if it is loaded on the ground.

If a linear body (wire (21)) for preventing elongation is inserted between the nozzles at both ends of the unit pipe bundle (15), the unit pipe bundle ( 15) Flexible protective tube
(1) The construction period is prevented, and the construction period is shortened without having to wait for the contraction. In addition, the flexible protective tube (1) is hardly cut off and resources can be saved.

[Brief description of the drawings]

 1 to 12 show an embodiment of the present invention.

FIG. 1 is a side view of a unit tube bundle.

FIG. 2 is an exploded front view of the nozzle.

FIG. 3 is a front view of a tube focused state.

FIG. 4 is a sectional view of an end portion of a flexible protective tube.

FIG. 5 is an explanatory diagram of a piping state.

FIG. 6 is a partial sectional side view of the outer tube.

FIG. 7 is an explanatory view of a connected state of unit tube bundles.

FIG. 8 is an explanatory view of a connection portion between the extension preventing wire and the detachment preventing wire.

FIG. 9 is a side sectional view of a flexible protective tube connecting portion.

FIG. 10 is an explanatory perspective view of a pipe terminal part.

FIG. 11 is an explanatory side view of a piping terminal.

FIG. 12 is an explanatory sectional view of a pipe terminal part.

FIG. 13 is a front view of a nozzle according to another embodiment.

FIG. 14 is a front view of a tube focusing state of another embodiment.

FIG. 15 is a perspective view of a stopper device.

FIG. 16 is an explanatory view of the use situation of the stopper device.

FIG. 17 is a side sectional view of a pipe connection part of still another embodiment.

FIG. 18 is an explanatory view of a piping state of a conventional example.

[Explanation of symbols]

 1 Flexible protective tube 2 Collar 3 Stub 14 Packing ring 15 Unit tube bundle 16 Piping groove 18 Contact hole 20 Outer tube 21 Stretch preventing wire 26 Wire 30 Retaining wire 31 Tube holding plate 34 Tube insertion port 35 Inner ring 39 Outer ring 42 Bellmouth

Claims (7)

[Claims] 1. A handhole is provided at a predetermined interval in a pipe groove, and the handhole is connected with an outer pipe, while a plurality of unit-length flexible protective tubes are connected at least at both ends by a nozzle. A unit tube converging body having a lower outer peripheral shape adapted to the inner peripheral shape of the outer tube at least at the nozzle portion,
The earliest unit tube bundle is inserted into the outer tube from the hand hole at one end, the wire inserted from the hand hole at the other end is hooked on the front end of the unit tube bundle, and pulled into the other end. Connect the front end of the second unit tube bundle to the rear end of the first unit tube bundle, and then pull in the unit tube bundle sequentially to the other end.The third and subsequent unit tube bundles are similarly connected And piping the flexible protective tube into the outer tube. 2. The piping method according to claim 1, wherein the outer pipe has a circular cross section and an inner circumference is smooth. 3. The piping method according to claim 1, wherein a linear body for preventing elongation is inserted between the nozzles at both ends of the unit pipe bundle. 4. The piping method according to claim 1, wherein said interconnecting portion of said unit pipe bundle is provided with a retaining means. 5. The piping method according to claim 4, wherein said retaining means is extended between the linear members for preventing elongation. 6. The piping method according to claim 4, wherein said retaining means is provided between said nozzles. 7. A pipe holding plate having a plurality of pipe insertion ports is mounted inside the communication port of the handhole, and inner rings are respectively mounted on the pipe insertion ports of the pipe holding plate. Each of the flexible protection tube ends is inserted into the inner ring, and an outer ring is screwed into the inner ring from the inside of the hand hole, and a bell mouth inside the outer ring is connected to the flexible protection tube end. The plumbing method according to any one of claims 1 to 6,