JP2008048495A - Piping system for cables and cabling method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To smoothly pass a cable insertion tool 19 through a bent portion or a branch of a cable protection tube and pull a distribution cable without causing damage to the distribution cable. <P>SOLUTION: A piping system for cables protects trunk cables 4 and distribution cables 8 and wires a distribution cable 8 to a destination of wiring. The system is characterized in that: a trunk cable housing portion 58 for housing the trunk cables 4 and a distribution cable housing portion 56 for housing the distribution cables 8 positioned thereabove are separated from each other by a separator 55; the distribution cable 8 is pulled out by a branch pipe 60 and wired to a destination of wiring by a wiring pipe; a separator 55 is so constituted that its central portion is lower than the inner wall of the cable protection tube, and thus the distribution cables 8 are gathered in its central and lower part; and the opening for pulling out the distribution cable is so disposed that the portion of the opening closest to the separator 55 is closer to the separator 55 than a predetermined value. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a cable piping system or a cable wiring method for wiring a communication cable such as a telephone line or an optical fiber laid in the ground to a building such as a building or a house.

Conventionally, communication cables such as telephone lines and optical fibers are composed of, for example, a plurality of trunk cables connecting telephone offices and a plurality of wiring cables branched from the trunk cables and wired to buildings such as buildings and houses. Has been. In order to maintain the scenery of the road, for example, as shown in Patent Document 1, a cable burying structure in which each trunk cable and each wiring cable are buried under the road surface of the road is known. This technology is divided into a main communication pipe and a free access pipe. FIG. 1 shows a cross-sectional view of the main communication pipe and the free access pipe.
A plurality of trunk cables 4 are passed through the main communication pipe 1. The trunk cable 4 is accommodated in the main communication pipe 1 in a state of being connected to the sheath pipe 6.

On the other hand, the free access pipe 2 is usually installed so as to be located immediately above the main communication pipe 1. In the example of FIG. 1, a plurality of wiring cables 8 are accommodated in the free access pipe 2. The free access pipe 2 has an opening 10, and a branch pipe 12 is connected to the opening 10. A distribution cable 81 that is one of the plurality of distribution cables 8 is branched through the branch pipe 12. A wiring pipe 14 is joined to the branch pipe 12, and the wiring cable 81 is wired to a building or a house by the wiring pipe 14.
The main communication pipe 1 and the free access pipe 2 are embedded between manholes and handholes (hereinafter referred to as “manholes”). In manholes, inspection work and connection work of wiring cables and trunk cables are performed.

When a wiring cable is newly wired, the wire tool 19 shown in Patent Document 2 is used. FIG. 2A shows a specific example of a simplified side surface of the wire tool 19, and FIG. 2B shows a specific example of a simplified side surface of the wire tool 19. The wire tool 19 includes a tip 21 and a rod 20.
The rod 20 is a rod-shaped material having an elastic force and a sufficient length, and is wound around a drum or the like (not shown) when not in use.

Furthermore, the front end portion 21 includes a cylindrical rear end portion member 22, a front end portion member 26, an attachment portion 23, and an expansion / contraction body 25. The expansion / contraction body 25 is formed by binding both ends of a plurality of linear members 24. Each binding portion of the linear member 18 is bound by a rear end member 22 and a front end member 26. The expansion / contraction body 25 is provided with a plurality of strings 27 for fastening the linear member 24 (in this example, the strings 27 are two strings 27a and 27b), and the appearance is shown in FIG. 2B. Thus, the state where the string 27 is hung around the expansion / contraction body 25, that is, a state where a plurality of rings for fastening the linear member 24 of the expansion / contraction body 25 are provided. The string 27 prevents an existing wiring cable or the like from entering between the linear members 24 forming the expansion / contraction body 25.
The tip 21 is extendable, and the diameter of the tip 21 (in this example, the diameter of a circle generated by the string 27b) is sufficiently larger than the diameter of the wiring cable when there is no external force. The tip 21 can be attached to and detached from the rod 20 by the attachment 23.

  Next, a wiring method using the wire tool 19 will be described. First, the wiring tool 19 is pushed through the wiring pipe from the place E where a new wiring is desired. As described above, since the rod 20 has an elastic force, it can be pushed even in a wiring tube having many curved portions. Then, when the wire 19 reaches the free access pipe 2 through the branch pipe, it is further pushed through the free access pipe 2 to the target manhole or the like. Here, as described above, the distal end portion 21 having the expandable / contracted body 25 that is extendable is attached to the distal end of the rod 20.

When there is no gap between the existing wiring cables, in principle, the leading end portion 21 allows the wire 19 to pass through without being caught by the wiring cable. However, in the case where a gap is generated between the existing wiring cables, if the wiring tool 19 passes through the gap, the wiring cable runs over the wiring tool 19, so that the wiring tool 19 is caught on the existing wiring cable. Due to the occurrence or frictional force between the existing wiring cable and the wiring tool 19, it becomes difficult for the wiring tool 19 to move forward.
When passing the wire 19 through the free access pipe 2, the free access pipe 2 is cylindrical, so as shown in FIG. And since it gathers in the center, a clearance gap does not arise between the existing wiring cables 8, and the wiring tool 19 passes above the wiring cables 8. Therefore, there is no possibility that the wire tool 19 is caught by the wiring cable.

The description returns to the wiring method using the wire tool 19. When the wiring tool 19 reaches the target manhole or the like, an operator or the like removes the tip 21 of the wiring tool 19 from the rod 20 in the manhole or the like, and instead connects one end of the wiring cable to the rod 20. When the wiring tool 19 (rod 20) to which the wiring cable is connected is pulled from the place E to be newly wired, the wiring cable is also pulled simultaneously. Then, the wiring can be routed to the place E where the wiring cable is desired to be routed through the free access pipe 2, the branch pipe 12, and the wiring pipe.
The above cable burying structure is advantageous, for example, when burying under a narrow road. This is because if the diameter of the main communication pipe 1 is X1 and the diameter of the free access pipe 2 is X2, the substantial lateral width of X1 or X2 is longer.

  However, since two pipes of the main communication pipe 1 and the free access pipe 2 are used, there is a problem that the cost is increased, and the amount of excavation is increased in the burying work, and the burying work becomes complicated. If the distance between the main communication pipe 1 and the free access pipe 2 is d, the actual vertical width is X1 + X2 + d, which is long. Therefore, in the future, when the underground cable has progressed and it is necessary to embed trunk cables and wiring cables under the narrow road surface of the narrower road, the above cable embedment structure can be used under the narrow road surface. It becomes difficult to provide it.

Therefore, it can be easily considered by those skilled in the art that one cable protection tube is divided into two by a partition plate. In the following description, this structure is referred to as a binary protective tube. A specific example of the binary protective tube is shown in FIG. The cable protection tube 52 is partitioned by a partition plate 54, and a wiring accommodating portion 56 that accommodates the plurality of wiring cables 8 is provided on the upper side, and a main line accommodating portion 58 that accommodates the plurality of trunk cables 4 is provided on the lower side. The trunk cables 4 pass through the sheath tube 6.
Japanese Patent Laying-Open No. 2005-261079 JP 2005-223972 A

  FIG. 4 shows a simplified cross-sectional view of the cable protection tube 52 as viewed from directly above. A cable protection tube 52 extends from a manhole or the like 200, and this cable protection tube 52 has at least a bent tube portion 202, a straight tube portion 204, a branch portion 206, and a branch tube 60. A plurality of existing wiring cables are housed in the wiring housing portion of the cable protection tube 52, and the existing wiring cable 81 is wired to the existing house 210 through the branch pipe 60.

  When wiring to a place E to be newly laid, first, the above-described wire connecting tool 19 is pushed through the branch pipe 214 in the direction of the arrow toward the manhole or the like 200. FIG. 5 shows a cross-sectional view of the branching portion 206 as viewed from the S1 side at the position A. In the cross-section at the position A as viewed from the points S1 and S2, a plurality of wiring cables are passed through the wiring accommodating portion 56. 6A and 6B show the state of being present, respectively. 6A, FIG. 6B or FIG. 7A, FIG. 7B, FIG. 9, FIG. 10, FIG. 14A, FIG. 14B, FIG. 15A, FIG. The direction of travel (the direction of manholes, etc.) is indicated. Further, in FIG. 5, the portions denoted by the same reference numerals shown in FIG. 3 are portions having the same functions, and the same applies to the description of the following drawings.

  The branch pipe 60 has a wiring pipe joint 62 for joining a wiring pipe (not shown). As described above, the wiring cable 81, which is one of the plurality of wiring cables 8, is further routed to the wiring destination (existing house 210) through the branch pipe 60.

  As shown in FIGS. 5, 6 </ b> A, and 6 </ b> B, a gap space R <b> 1 is generated between the partition plate 54 and the wiring cable 81. As described above, when the wiring tool 19 passes through the clearance space R1, the wiring tool 19 sinks under the wiring cable 81 and is caught by the wiring tool 19, or passes under the wiring cable 81. Become.

7A and 7B show how the wire fitting 19 is caught by the wiring cable 81 in the wiring housing portion 56 viewed from the points S1 and S2, respectively. When the wiring tool 19 enters the gap space R1, as shown in FIGS. 7A and 7B, the wiring tool 19 gets caught in the wiring cable 81 or passes under the wiring cable 81.
A cross-sectional view of the binary protective tube at the position B of the straight tube portion 204 viewed from the point S3 is the above-described FIG. Further, FIG. 8 shows a cross-sectional view of the binary protective tube at the position D of the curved pipe portion 202 viewed from the point S4. In the cross section at the position C of the curved pipe portion 202 viewed from the point S3, FIG. 9 shows a state where a plurality of wiring cables 8 are connected.

  As can be understood from FIG. 3, in the straight pipe portion 204, the plurality of wiring cables 8 are accommodated in a distributed manner, and each of the plurality of wiring cables is separated to some extent. In addition, as can be understood from FIG. 8, in the curved pipe portion 202, the plurality of wiring cables 8 are biased in the bending direction (leftward as viewed from the point S <b> 4) due to the tension. Therefore, in the process from the position B to the position D, a gap space R2 is generated as shown in FIG.

When the wiring tool 19 enters the clearance space R2, as shown in FIG. 10, when viewed from the point S4, the wiring tool 19 is blocked by the wiring cable, or the wiring tool 19 is caught or passes under the wiring cable 81. .
Three problems will be described below with the above-described binary protective tube.
(1) When the wiring tool 19 enters the clearance spaces R1 and R2 described above, the wiring cable rides on or is blocked by the wiring cable, and the wiring cable is caught by the front. Do not advance or pass under the wiring cable.
(2) In addition, when the existing wiring tool 19 described in (1) passes under the wiring cable and reaches a manhole or the like, a wiring cable that is newly wired to the tip of the wiring tool 19 ( Hereinafter, when a new wiring cable is attached and this wire 19 is pulled, the new wiring cable is also pulled. Then, the new distribution cable is pulled while the existing distribution cable is on the new distribution cable. As a result, a large friction occurs in the contact portion due to the weight of the existing wiring cable. Then, either the existing wiring cable or a new wiring cable may be damaged.
(3) Further, as shown in FIG. 3, the wiring cable may be located near the inner wall of the cable protection tube 52 in the wiring housing portion 56. When a new branch pipe is connected, it is necessary to make a hole in the cable protection pipe 52. When drilling holes, there is a risk of damage to the distribution cable near the inner wall.

  According to the present invention, a cable piping system for protecting a trunk cable and a distribution cable and wiring the distribution cable to a wiring destination, the trunk line accommodating portion accommodating the trunk cable, and an upper portion of the trunk line accommodating portion. A cable protection tube that is located in the cable storage tube, and that includes a separator that separates the trunk wire storage portion and the wiring storage portion; and a wiring cable that is stored in the wiring storage portion of the cable protection tube A branch pipe connected to the branch pipe, and a wiring pipe for wiring the wiring cable to the wiring destination, and the separator collects the wiring cable at a central portion of the cable protection pipe. In addition, the central portion is lower than the inner wall portion of the cable protection tube, and the wiring housing portion is used for drawing the wiring cable into the branch tube. Having a mouth portion, closest to the separator portion of said opening, than a predetermined value and configured close to the separator.

  With the above configuration, since the existing wiring cable is accommodated in the center and downward along the separator in the wiring accommodating portion, no gap space is generated below the plurality of existing wiring cables. Therefore, the wire tool 19 advances over the existing wiring cable, and the wiring cable to be newly wired is pulled over the existing wiring cable. Therefore, the above-mentioned problem (1) is not caught between the wiring tool 19 and the existing wiring cable, and the wiring tool 19 does not pass under the wiring cable.

  In addition, since the wiring tool 19 passes above the wiring cable, when a new wiring cable is pulled, friction is generated between the existing wiring cable and the new wiring cable due to the weight of the existing wiring cable. Since there is no problem, the above problem (2) is also solved.

  In addition, when opening a hole in the cable protection pipe 52 in order to newly connect a branch pipe, the existing wiring cable is accommodated downward and in the center as described above, so that the existing wiring cable is damaged. The above-mentioned problem (3) can be solved because the hole can be drilled without having to do so.

  A specific cross-sectional view of the cable protection tube 52 used in the cable piping system of the present invention is shown in FIG. In the following description, the cable protection tube of the present invention is simply referred to as a cable protection tube. The cable protection tube 52 is cylindrical, and a synthetic resin tube such as a vinyl chloride tube is used. The cable protection tube 52 is divided by the separator 55 into at least two of a wiring housing portion 56 and a main wire housing portion 58. A plurality of wiring cables 8 are accommodated in the wiring accommodation portion 56, and a plurality of trunk cables 4 are accommodated in the trunk line accommodation portion 58. Each of the plurality of trunk cables 4 is passed through the sheath tube 6.

  The separator 55 may be laid between one manhole or the like and the other manhole or the like between two manholes or the like, or may be laid at an arbitrary interval or at a certain portion. In the following description, the case where the cable protection tube 52 is viewed in a cross section will be described. The central portion of the separator 55 is lower than the inner wall portion of the cable protection tube 52. Specifically, the separator 55 has a flat portion 82 at the center, and a pair of swash plate portions 80 extend obliquely upward from both ends of the flat portion 82. About the swash plate part 80, it has the fixing | fixed part 84 for fixing to a cable protection tube in the edge 80b on the opposite side to the edge 80a couple | bonded with the plane part 82. FIG. Due to the shape of the separator 55, the plurality of wiring cables 8 are collected in the center and downward.

  The fixing portion 84 has an arc shape along the inner wall of the cable protection tube. The cable protection tube 52 has a rectangular separator holding portion 88 on the inner wall surface, and the fixing portion 84 of the separator 55 has a rectangular recess 86 for fixing to the separator holding portion 88.

  FIG. 12 shows a cross-sectional view of the cable protection tube 52 at a portion where the branch tube 60 is joined. The cable protection tube 52 has an opening 64 for drawing the wiring cable into the branch tube 60.

  The branch pipe 60 is formed integrally with the saddle portion 61. The saddle portion 61 is formed of a semi-cylindrical member having a cross section whose curvature is substantially equal to the curve of the cable protection tube 52, and the axis thereof is arranged to coincide with the axis of the cable protection tube body 52. The center portion of the saddle portion 61 is opened so as to correspond to the opening portion 64. The saddle portion 61 is fixed to the cable protection tube main body 52 by adhering the inner surface 61a thereof to the outer peripheral surface of the cable protection tube 52 with, for example, an adhesive (not shown). Further, the branch pipe 60 has a wiring pipe joint portion 62 for joining a wiring pipe (not shown) for wiring the wiring cable to the wiring destination.

  If the distance between the portion 64a of the opening 64 closest to the separator 55 and the separator 55 is f, the distance f is smaller than a predetermined value, that is, the portion 64a of the opening 64 closest to the separator 55 is a predetermined value. Rather than the separator 55. Here, the predetermined value is a value determined between the result of repeated experiments and the branch pipe and the cable protection pipe 52 conventionally used. Moreover, being closer to the separator 55 than a predetermined value means that the distance f is set to such an extent that the wire 19 is not caught by the wiring cable 81. The distance f is a value determined by the diameter of the wiring cable 81 and the shape of the wiring tool 19. The distance is shorter than the distance f shown in FIG. In addition, the shorter distance f means that the gap space R1 is smaller. Therefore, the gap space R1 shown in FIG. 12 of the present invention is smaller than the gap space R1 shown in FIG. Furthermore, when the distance f is smaller than the radius r of the tip portion 21 of the line tool 19, the line tool 19 is not inserted into the gap space R1.

In FIG. 4, when the cable protection tube 52 of the present invention is used, a process of wiring a wiring cable to a point E where a new wiring is desired will be described. FIG. 13 is a flowchart showing the flow of the wiring process.
First, the wiring tool 19 is pushed into a wiring pipe (not shown) from the point E where the wiring cable is to be routed, and is inserted into the cable protection pipe 52 through the branch pipe 214 in the arrow direction (step S2). Then, the wiring tool 19 advances while being pushed above the wiring cable in the wiring housing portion 56 (step S4).

  The cross section of the cable protection tube at the position A viewed from the point S1 is FIG. 12, and in the cross section of the cable protection tube at the position A viewed from the points S1 and S2, the plurality of wiring cables 8 pass through the wiring housing portion 56. FIGS. 14A and 14B show how the distribution cable 81 is drawn out to the branch pipe 60, respectively. In this embodiment, since the distance f is shortened, as shown in these drawings, the gap space R1 generated between the separator 55 and the wiring cable 81 is reduced, so that the wire fitting 19 does not pass through the gap space R1. . Further, due to the shape of the separator 55, the wire connecting tool 19 also approaches the center. Therefore, as shown in FIGS. 15A and 15B, the wiring tool 19 passes over the existing wiring cable, and the hooking and friction between the wiring tool 19 and the existing wiring cable 8 do not occur.

  Further, in the straight pipe portion 204 and the curved pipe portion 202, a cross-sectional view of the cable protection tube at the position B viewed from the point S3 is FIG. 11, and a cross-sectional view of the cable protection tube of the present invention at the position D viewed from the point S4. 16 shows a state in which the plurality of wiring cables 8 are accommodated in the wiring accommodating portion 56 in the cross section at the position C of the curved pipe portion 202 viewed from the point S3. As can be understood from FIGS. 11 and 16, since the plurality of wiring cables are always gathered in the straight pipe portion 204 to the curved pipe portion 202, the gap space R2 in FIG. 9 does not occur as shown in FIG. Therefore, since the wiring tool 19 passes over the plurality of wiring cables, the hooking and friction between the wiring tool 19 and the existing wiring cable 8 do not occur.

When the wiring tool 19 reaches the manhole or the like 200, the tip 21 of the wiring tool 19 is removed, and one end of a new wiring cable is connected to the wiring tool 19 (step S6). By pulling the wiring tool 19 to which a new wiring cable is connected, the wiring cable is drawn into the cable protection tube, and the wiring cable is pulled to the point E of the wiring destination through the wiring tube (step S8). Here, in the straight pipe portion 204 from the curved pipe portion 202, the wiring tool 19 passes above the existing wiring cable 8, so that friction due to the weight of the existing wiring cable does not occur and a new wiring is provided. There is no risk of damage to cables and existing wiring cables.
In addition, since the new distribution cable does not pass below the existing distribution cable at the branching portion 206, friction due to the weight of the existing distribution cable does not occur, and the new distribution cable or the existing distribution cable is damaged. There is no fear.

  Next, a modification of the cable protection tube of the present invention will be described. As described above, the separator 55 may have any shape that collects existing wiring cables in the center and downward. A cross-sectional view of a modified example of the separator 55 is shown in FIG. The separator 55 described above is shown in FIG. 19A. Further, the separator 55 may be the one shown in FIG. 19B without the flat portion 82, or may have a substantially U-shaped shape with a rounded central portion as shown in FIG. 19C. Variations of the separator 55 are not limited to these.

  A modification of the rectangular separator holding part 88 and the fixing part 84 provided at both ends of the separator 55 on the inner wall surface of the cable protection tube will be described. As shown in FIG. 20A, when viewed in a cross section, a triangular separator holding portion 88 and a fixing portion 86 that receives the triangular separator holding portion 88 are also conceivable. However, as shown in FIG. 20B, the separator 55 has arcuate fixing portions 84 along the inner wall surface at both ends, and the fixing portion 84 has a rectangular recess 86 for fixing to the separator holding portion 88. If it has composition which has, separator 55 can be fixed more stably.

  In addition, as shown in FIG. 21, if the branch pipe 60 is configured to draw the wiring cable 81 downward from the normal direction of the outer wall of the cable protection pipe, the amount of soil above the cable protection pipe 52 and the branch pipe 60 can be reduced. Since the amount of soil above can be made the same, it is possible to reduce the burden of the work of burying the cable protection tube 52. In addition, when there is no soil covering over the cable protection tube 52 for some reason, the surfaces of the cable protection tube 52 and the branch tube 60 do not appear from the ground.

  Further, since it is not in the normal direction of the outer wall, the cable protection tube 52 must be prepared for the right and the left when viewed in cross section, and the management of the articles becomes complicated. Therefore, the branch pipe 60 may be provided with both the right branch pipe and the left branch pipe so that the wiring cable can be pulled out from the left and right of the cable protection pipe. For example, as shown in FIG. 22, the saddle portion 61 is shared, and the right branch pipe 60a and the left branch pipe 60b are provided to create the left and right branch pipes 600. FIG. 23 shows a cable protection pipe 52 to which the left and right branch pipes 600 are applied. If necessary, an opening 64b corresponding to the opening of the branch pipe 60b may be provided.

  FIG. 24 is an enlarged view of a cross section of the vicinity of the opening 64 of the cable protection tube 52 and a portion related thereto. As described above, since the portion 64a closest to the separator 55 of the opening 64 is closer to the separator 55 than a predetermined value, the opening 64 and the branch pipe 60 have shapes as shown in FIG. 24A. . As a modified example of the branch pipe 60, a branch pipe 60 provided with a protrusion 70 shown in FIG. By providing the projecting portion 70 in the branch pipe 60, it is possible to suppress burrs and the like generated when the opening portion 64 is provided in the cable protection tube 52. However, when considering the distance between the portion 64a of the opening 64 closest to the separator 55 and the separator 55, the thickness e of the protrusion 70 must be considered.

Sectional drawing of the main communication pipe | tube 1 and the free access pipe | tube 2 which are the prior art. FIG. 2A is a side view of the simplified wiring tool 19, and FIG. 2B is a cross-sectional view of the front side surface of the simplified wiring tool 19. Sectional drawing of the straight tube | pipe part of a binary protection tube. A simplified cross-sectional view of a cable protection tube 52 extending from a manhole or the like 200 and having at least a curved pipe section 202, a straight pipe section 204, a branch section 206, and a branch pipe 60. Sectional drawing of the branch part of a binary protection tube. 6A is a diagram showing a state in which a plurality of wiring cables 8 are passed through the wiring accommodating portion 56 in the cross section at the position A viewed from the point S1 in FIG. 4, and FIG. 6B is a point in FIG. It is a figure which shows a mode that the some wiring cable 8 is penetrated in the wiring accommodating part 56 in the cross section by the position A seen from S2. 7A is a diagram showing a state in which the wire 19 is caught by the plurality of wiring cables 8 in the wiring housing portion 56 in the cross section at the position A viewed from the point S1 in FIG. 4, and FIG. 7B is a diagram in FIG. FIG. 6 is a diagram showing a state in which the wire tool 19 is caught by a plurality of wiring cables 8 in the wiring housing portion 56 in the cross section at the position A viewed from the point S2. Sectional drawing of the curved pipe part 202 seen from point S4 in FIG. The figure which shows a mode that the some wiring cable is penetrated in the wiring accommodating part 56 in the cross section by the position C seen from the point S1 in FIG. FIG. 5 is a diagram illustrating a state in which the wiring tool 19 is caught by the wiring cable in the wiring housing portion 56 in the cross section at the position D viewed from the point S4 in FIG. Sectional drawing of the straight tube | pipe part of the cable protection tube of this invention. Sectional drawing of the branch part of the cable protection tube of this invention. The flowchart which shows the flow of the wiring processing method of the new wiring cable of this invention. 14A is a diagram showing a state in which a plurality of wiring cables 8 are passed through the wiring accommodating portion 56 in the cross section of the cable protection tube of the present invention at the position A viewed from the point S1 in FIG. 14B is a view showing a state in which a plurality of wiring cables 8 are passed through the wiring housing portion 56 in the cross section of the cable protection tube of the present invention at the position A as viewed from the point S2 in FIG. 15A is a view showing a state in which the passing wire 19 passes through the wiring housing portion 56 in the cross section of the cable protection tube of the present invention at the position A viewed from the point S1 in FIG. 4, and FIG. 15B is a view in FIG. It is a figure which shows a mode that the wiring tool 19 passes in the wiring accommodating part 56 in the cross section of the cable protection tube of this invention by the position A seen from this point S2. Sectional drawing of the curved pipe part of the cable protection pipe of this invention. FIG. 5 is a diagram showing a state in which a plurality of wiring cables 8 are passed through the wiring housing portion 56 in the cross section of the cable protection tube of the present invention at the position C viewed from the point S3 in FIG. 4. FIG. 5 is a diagram showing a state in which the wire passing tool 19 passes through the wiring housing portion 56 in the cross section of the cable protection tube 52 of the present invention at the position D viewed from the point S4 in FIG. 4. The figure which shows the modification of the separator 55. FIG. The figure which shows the modification of the separator holding part 88 and the fixing | fixed part 84. FIG. The figure which shows the cable protection pipe | tube 52 which attached the branch pipe 60 which deform | transformed. The figure which is the modification of the branch pipe 60, and shows the right and left branch pipe 600 which can take out a wiring cable from right and left. The figure which shows the cable protection pipe | tube 52 which attached the right and left branch pipe 600 shown in FIG. FIG. 24A is an enlarged view of the opening 64 and the branch pipe 60 of the present invention, and FIG. 24B is a view showing a modification in which the protrusion 70 is provided on the cable protection pipe 52 shown in FIG. 24A.

Claims (5)

A cable piping system for protecting a trunk cable and a distribution cable and wiring the distribution cable to a wiring destination,
A cable protection tube comprising: a trunk line accommodating part that accommodates a trunk cable; a wiring accommodating part that is located above the trunk line accommodating part and accommodates a wiring cable; and a separator that separates the trunk line accommodating part and the wiring accommodating part. ,
A branch pipe for pulling out the wiring cable housed in the wiring housing portion of the cable protection pipe;
Connected to the branch pipe, and having a wiring pipe for wiring the wiring cable to the wiring destination,
The separator is lower in the central portion than the inner wall portion of the cable protection tube in order to collect the wiring cables in the central portion of the cable protection tube,
The wiring housing portion has an opening for drawing a wiring cable to the branch pipe;
The portion of the opening closest to the separator is closer to the separator than a predetermined value;
A piping system for cables. The cable piping system according to claim 1,
The cable protection tube also has a rectangular separator holding portion on the inner wall surface,
The separator has arcuate fixing portions along the inner wall surface at both ends,
The cable piping system according to claim 1, wherein the fixing portion has a rectangular recess for fixing to the separator holding portion. A cable piping system according to claim 1 or 2,
A cable piping system, wherein the branch pipe pulls out a wiring cable downward from a normal direction of an outer wall of the cable protection pipe. The cable piping system according to claim 3,
The cable pipe system according to claim 1, wherein the branch pipe includes both a right branch pipe and a left branch pipe so that a wiring cable can be drawn from the left and right of the cable protection pipe. Cable protection comprising: a trunk line accommodating part that accommodates a trunk line cable; a wiring accommodating part that is located above the trunk line accommodating part and accommodates a plurality of wiring cables; and a separator that separates the trunk line accommodating part and the wiring accommodating part. Tube,
A branch pipe for pulling out the wiring cable housed in the wiring housing portion of the cable protection pipe;
A cable wiring method for wiring a wiring cable to a cable piping system connected to the branch pipe and having a wiring pipe for wiring the wiring cable to the wiring destination;
When there is no external force, the wire fitting having a tip that is sufficiently larger than the diameter of the wiring cable is pushed into the wiring pipe from the wiring destination, and is inserted into the cable protection pipe through the branch pipe. An insertion step;
Advancing step in which the tip portion advances while being pushed over the wiring cable in the wiring housing portion;
A connection step of connecting one end of a wiring cable to a wire tool after the tip portion reaches a manhole or a hand hole and the tip portion is removed;
A pulling step of pulling the wiring cable into the cable protection tube by pulling the wire tool and further pulling the wiring cable through the wiring tube to the wiring destination,
In the advancing step, since the separator is lower in the center portion than the inner wall portion of the cable protection tube, the existing wiring cables gather in the center portion of the cable protection tube, and the gaps between the existing wiring cables are Since the tip of the wiring tool cannot be inserted, the wiring tool advances only above the existing wiring cable.
In the advancing step, further, the portion closest to the separator of the opening for pulling out the wiring cable from the wiring housing portion to the branch pipe is closer to the separator than the radius of the tip of the wire tool, Since the gap created by the existing wiring cable drawn out to the branch pipe has a structure in which the tip of the wiring tool cannot be inserted, the wiring tool only advances above the existing wiring cable,
The cable routing method is characterized in that, in the advancing step, the leading end of the wire passing tool advances only above the existing wiring cable, so that the pulled wiring cable is pulled on the existing wiring cable also in the pulling step.

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