JP2003299235A - Communication cable wiring structure of subterranean duct, and guide pipe used for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable stable and reliable communication by enabling an ideal communication infrastructure to be built. <P>SOLUTION: A trunk communication cable 11 is passed within a main pipe 2 provided with a manhole 4 and a branch pipe 3. Within the manhole 4, a part of the trunk communication cable 11 is separated as a branch communication cable 12, and the branch communication cable 12 is wired to a connection object from the branch pipe 3. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for laying a communication cable in an underground buried pipeline and a guide tube used for the structure.

[0002]

2. Description of the Related Art Recently, there is a plan to draw a communication cable into each home by utilizing an existing underground buried pipeline, that is, FTTH (F
Iber To The Home) plans are underway. As the existing underground pipes, it is possible to use sewer pipes such as sewer pipes, water pipes, and gas pipes. These underground pipes are suitable for laying communication cables and are expected to expand in the future because they are connected to homes to be connected and are stretched all over the city.

For example, when a communication cable is laid in an existing sewer pipe, as shown in FIG. 13, the sewer pipe 1 has a main pipe 2 running from the upstream side to the downstream side where the sewage flows, and is connected to the main pipe 2. Is provided with a branch pipe 3 connected to each connection target. A human hole 4a and a human hole 4b are arranged in this order from the upstream side of the main pipe 2 with the plurality of branch pipes 3 interposed therebetween. This human hole 4 is used for checking and cleaning the main pipe 2 and the branch pipe 3.
Required for ventilation and water sampling, usually 50m-100m
It is provided for each. A guide tube 5 that encloses the trunk communication cable 101 is provided on the upper wall of the main tube 2, and the guide tube 5 is supported by a trunk tension member 8. The trunk tension member 8 is tensioned from both sides by a tension device 7 provided in the human hole 4.

The trunk communication cable 101 connected from the upstream side of the main pipe 2 is a downstream trunk communication cable 101a in a branch connection box 6 inside the manhole 4a or in a side chamber communicating with the inner wall surface of the manhole 4a. And the branch communication cable 102. Then, the branch communication cables 102 are wired in order from the upstream side as branch communication cables 102a, 102b, 102c in the respective branch pipes 3 and connected to the connection targets. The trunk communication cable 101a is sent to the manhole 4b, and the trunk connection cable 6a of the manhole 4b branches the trunk communication cable 101a similarly to the manhole 4a. With such a piping structure, the trunk communication cable 101 is sequentially branched and connected to each connection target.

[0005]

However, in the above-mentioned conventional piping structure, when the trunk communication cable is branched at the branch connection box in the human hole, the trunk communication cable is temporarily cut off, and then the communication cable is disconnected. A method is used in which the communication wire in the inside is divided into one used as a branch communication cable and one used as a trunk communication cable connected to the downstream side, and each is fused and reconnected. for that reason,
The communication cable connection work increases and the work is complicated, and the presence of many connection parts in the trunk communication cable causes loss of connection parts and air loss between cable connections, resulting in a large communication loss. There is a problem.

Therefore, the present invention has been made in view of the above-mentioned problems, and it is possible to construct an ideal communication infrastructure, and to bury underground a communication cable that enables stable and highly reliable communication. An object is to provide a pipeline wiring structure.

[0007]

In order to solve the above-mentioned problems, the underground buried conduit wiring structure for a communication cable according to claim 1 has a plurality of main wires provided with a human hole and a branch pipe. The trunk communication cable is inserted, a part of the trunk communication cable is connected to the branch communication cable in the human hole, and the branch communication cable is wired from the branch pipe to a connection target.

According to the above configuration, a part of the trunk communication cable is connected to the branch communication cable, and the remaining trunk communication cable is not cut in the manhole. Therefore, the number of connection points of the trunk communication cable is minimized, and it is possible to minimize the loss at the connection portion and the loss due to air bites between the cable connections.
As a result, it becomes possible to construct an ideal communication infrastructure, and stable and highly reliable communication becomes possible. Also,
By inserting multiple trunk communication cables in the main, communication damage will be limited to some trunk communication cables even if some are broken, and by using normal trunk communication cables temporarily Recovery work can also be performed quickly. In addition, in the present invention, the human hole refers to a pit-shaped work space, and includes a pit newly excavated for work. In addition, the inside of the human hole includes a side chamber provided in communication with the inner wall surface of the human hole.

According to a second aspect of the present invention, there is provided a buried underground conduit wiring structure for a communication cable, wherein a plurality of manholes are provided and an arbitrary number of branch pipes are provided on the downstream side of each manhole. A plurality of trunk communication cables are inserted into the pipe, and a part of the trunk communication cable is provided in each of the human holes so that the number of connections is determined based on the number of branch pipes on the downstream side of the human holes. The branch communication cables are respectively connected to the branch communication cables, and the branch communication cables connected at the respective human holes are respectively wired from the branch pipes corresponding to the human holes to the connection targets.

According to the above configuration, a part of the trunk communication cable is connected to the branch communication cable in the plurality of manholes, and the remaining trunk communication cables are partially connected to the branch communication cable. Until it is cut, it is not cut in each foramen. Therefore, the number of connection points of the trunk communication cable is minimized, and it is possible to minimize the loss at the connection portion and the loss due to air bites between the cable connections. As a result, it becomes possible to construct an ideal communication infrastructure, and stable and highly reliable communication becomes possible.

In a buried underground conduit wiring structure for a communication cable according to a third aspect of the present invention, there is provided a book in which a plurality of manholes are provided and an arbitrary number of branch pipes are provided on the downstream side of each manhole. A plurality of trunk communication cables are inserted in the pipe, and the number of connection pipes is determined based on the total number of branch pipes from the upstream human hole to the downstream human hole. Part of the trunk communication cable is connected to a branch communication cable, the branch communication cable is wired from the branch pipe corresponding to the human hole on the upstream side to the human hole on the downstream side to the connection target There is.

According to the above construction, a part of the trunk communication cable is provided in the upstream human hole, and the branch communication cable is provided based on the total number of branch pipes provided from the upstream human hole to the downstream human hole. The remaining trunk communication cable is not cut in each of these foramen. Therefore, the number of connection points of the trunk communication cable is minimized including 1, and the loss at the connection portion and the loss due to air trapping between cable connections can be minimized. As a result, it becomes possible to construct an ideal communication infrastructure, and stable and highly reliable communication becomes possible. Further, since the branch communication cable is created at one time in the upstream human hole, the work process can be reduced and the work time can be shortened as compared with the case where the branch communication cable is created once in each human hole. be able to.

According to a fourth aspect of the present invention, there is provided a buried underground conduit wiring structure for a communication cable according to any one of the first to third aspects, in which the plurality of trunk communication cables accommodate a plurality of communication strands. It is characterized by being formed of a trunk communication cable in which a plurality of communication cables are combined, and a part of the trunk communication cable corresponds to a part of the unit communication cable.

According to the above configuration, the trunk communication cables are formed by combining a plurality of unit communication cables, and the number of trunk communication cables used in claims 1 to 3 can be reduced. Further, the work of connecting to the branch communication cable can be performed easily and in a short time only by taking out the required number of unit communication cables from the trunk communication cable.

According to a fifth aspect of the present invention, there is provided a buried underground conduit wiring structure for a communication cable according to any one of the first to fourth aspects, wherein the trunk communication cable is housed in a guide pipe laid on the main pipe. It is characterized by being formed by.

[0016] According to the above-mentioned structure, even if the material such as the tension material or the thick jacket is not used unlike the outdoor cable which is usually used as the trunk communication cable, it is housed in the guide tube and the communication is performed. Tension is not applied directly to the cable, and the outer surface is protected. This allows
Unlike the conventional case, the trunk communication cable can be connected to the branch communication cable without removing materials such as the tension material and the jacket, so that high workability can be obtained.
Therefore, a simple cable such as an outdoor cable can be used as the trunk communication cable.

According to a sixth aspect of the present invention, there is provided a buried underground conduit wiring structure for a communication cable according to the fifth aspect, wherein a trunk tension member is inserted into the guide tube, and the trunk tension member is tensioned between adjacent manholes. Is added to support the guide tube on the upper wall side of the main tube.

According to the above construction, the space above the main pipe can be set as the laying position of the guide pipe, so that it can be applied even when the fluid flows to the lower side of the main pipe like a sewer pipe. .

According to a seventh aspect of the present invention, there is provided a buried underground pipeline structure for a communication cable according to the fifth aspect, wherein:
A slide having an outer diameter substantially corresponding to the inner diameter of the existing pipeline and having an arc shape or a ring shape having at least a semicircle or more in cross section, and slidably holding the guide tube in a part of its length direction. It is characterized in that the guide pipe is supported on the upper wall side of the main pipe by attaching slack preventing materials having at least one portion formed at appropriate intervals.

According to the above construction, since the space above the main pipe can be set as the laying position of the guide pipe, it can be applied even when the fluid flows to the lower side of the main pipe such as a sewer pipe. .

The guide pipe according to claim 8 is a guide pipe in which a plurality of trunk communication cables are laid on the main pipe, and a plurality of thick holes into which the trunk communication cables are inserted and the branch communication cables are inserted. Characterized in that it has an internal height less than twice the outer diameter of the branch communication cable.

According to the above configuration, since each trunk communication cable is inserted into each thick hole, it is possible to prevent the trouble that the trunk communication cables are entangled in the guide tube during the entry of these trunk communication cables. Further, even when a plurality of branch communication cables are inserted into the same fine hole, the inside height of the fine holes is set to less than twice the outer diameter of the branch communication cable, and therefore, while the branch communication cables are being entered. There is no entanglement even in.

The guide tube according to claim 9 is the guide tube according to claim 8, wherein the pores are located above and / or below the large holes when the guide tube is laid inside the main tube. It is characterized by being arranged like this.

According to the above configuration, for example, when a plurality of branch communication cables are inserted into the pores arranged on the side surface side, the branch communication cables are prevented from overlapping due to the influence of gravity. It is necessary to provide a partition wall into which the cables are independently inserted, but if the pores are arranged above and below, the branch communication cables do not overlap with each other, so that the partition wall can be eliminated.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIGS. In the following description, a sewer pipe is assumed as the pipe, but the pipe is not necessarily limited to the sewer pipe in the present invention, and if the pipe is buried underground, for example, a steel pipe is used. It can be applied to all kinds of pipelines such as gas pipelines, water pipelines using cast iron pipes, rainwater pipelines, and power cable pipelines. In addition, in the case where the section of the underground conduit where the communication cable is laid is not provided with a human hole, it is possible to implement the present invention by forming a pit.

As shown in FIG. 1, the wiring structure M1 of the communication cable according to the present embodiment has a main pipe 2 for flowing sewage 14 from an upstream side to a downstream side, and a human hole 4 provided in the main pipe 2.
(Human hole 4a, human hole 4b, human hole 4 in order from the upstream side of main pipe 2
c) and the branch pipes 3 provided in an arbitrary number on the downstream side of each of the human holes 4, the sewer pipe 1 is provided.

The above-mentioned wiring structure M1 of the communication cable includes a guide pipe 5 provided on the upper wall between the human holes 4 of the main pipe 2,
The trunk communication cable 11, the branch communication cable 12 and the trunk tension member 8 which are inserted into the guide tube 5, and the individual holes 4
The branch connection box 6 and the tension device 7 provided in the.

The guide tube 5 is, as shown in FIG.
The partition plate 5c is partitioned to form a plurality of holes, and has a plurality of thick holes 5a and pores 5b along the longitudinal direction. The pores 5b are set to have an internal height that is less than twice the outer diameter of the branch communication cable 12.
The guide tube 5 is preferably made of a resin such as polyethylene and is lightweight and has chemical resistance, but other materials can be selected depending on the type of the main tube. The section of the guide tube 5 is not limited to this shape as long as it can properly store the trunk communication cable, the branch communication cable, and the like.

The above-mentioned guide tube 5 is, as shown in FIG.
The trunk communication cable 11 is provided in the thick hole 5a, and the branch communication cable 12 is provided in the fine hole 5b (generally referred to as a "lead-in wire").
And the trunk tension member 8 are inserted. As shown in the figure, the branch tension cable 12 may be inserted in the branch tension member 9. The trunk communication cable 11 and the branch communication cable 1 housed in the guide tube 5
2. The positions of the branch tension member 9 and the like are not limited to the positions shown in the drawing.

The trunk tension member 8 is made of a material having high strength and low elongation, and tension is applied from both sides by the tension device 7 provided in the adjacent human hole 4.
In this way, the guide pipe 5 is laid along the upper surface wall of the main pipe 2, and does not block the flow of the sewage 14 of the sewer pipe 1 to prevent the function as a lifeline.

The position of the trunk tension member 8 in the guide tube 5 is not limited to the position shown in the drawing, but may be in other pores or thick holes. Even if it is the outer surface of 5, the structure may be such that it is integrated with the guide tube 5 and the guide tube 5 can be laid on the upper wall of the main tube 2. In addition, the trunk tension member 8 is made of high-strength and low-elongation fiber such as polyparaphenylenebenzobisoxazole (PBO) fiber, aramid fiber, carbon fiber, metal fiber, and glass fiber. A scale or a stainless wire can be used.

Although the conventional trunk communication cable 11 and branch communication cable 12 are shown in FIG. 3, the trunk communication cable 11 is a unit communication cable 2 as shown in FIG.
You may comprise by combining one or more. The unit communication cable 21 has a tape-shaped communication wire 23 inserted in a pipe-shaped outer tube 21b. Multiple outer tubes 2
1b are combined and fixed by the belt body 21a to form the trunk communication cable 11. Thereby, the trunk communication cable 61 can be formed by a simple manufacturing method.
It is also possible to insert the trunk tension member 8 together with the tape-shaped communication element wire 23 into the outer tube 21b. The cross-sectional shape of the outer tube 21b is not limited to the circular shape,
The fixing means is not limited to the belt body 21a.
Furthermore, the hollow pipe is integrated to form a branch communication cable 12
It is also possible to set it as the entry point of.

As the tension device 7, for example, a drum type take-up type manual winch and a pair of hooks are used. Thereby, the trunk tension member 8 housed in the guide tube 5 is fixed to the hook on one side and tension is applied between the human holes 4 by the winch on the other side to support the guide tube 5 on the upper wall in the main tube 2. You can

The branch connection box 6 is one in which a communication cable is inserted to branch. In the present embodiment, a part 1 of the plurality of trunk communication cables 11 in the human hole 4a.
1b is used. In the branch connection box 6, all the communication wires 23 included in the trunk communication cable 11b are once cut off and connected to the branch communication cable 12a.

The above tension device 7 and branch junction box 6
Are provided in the human hole 4, as shown in FIG. In the human hole 4a, the trunk communication cable 11a and the branch communication cable 12a are wound around the inner circumference and fixed while being fixed by the guide 15. By being fixed in this way, the communication cable can have a margin and can be connected to various connection targets. In addition, it is also possible to secure a sufficient amount of branch communication cable 12 by winding the inner circumference of the human hole 4 in this manner.

The wiring structure M1 of the trunk communication cable 11 and the branch communication cable 12 will be described below.
A plurality of trunk communication cables 11a, 11b, 11c, 11d, which have entered from the upstream side of the human hole 4a, have a part 11b of the trunk communication cable separated in the human hole 4a, and the remaining trunk communication cables 11a, 11c, 11d. Has passed through the human hole 4a. Part of trunk communication cable separated here 11
b is connected to the branch communication cable 12a in the branch connection box 6. The branch communication cables 12a are wired to the respective branch pipes 3 as any number of branch communication cables 12c, 12c ', 12c "... (not shown in the figure) and connected to each connection target. To be done.

Then, in the trunk communication cables 11a, 11c, 11d that are inserted downstream from the manhole 4a, a part 11c of the trunk communication cable is separated in the manhole 4b, and the remaining trunk communication cables 11a, 11d are It has passed through the human hole 4b. Part 11c of the trunk communication cable separated here
Is connected to the branch communication cable 12b at the branch connection box 6. The branch communication cables 12b are wired to the respective branch pipes 3 as any number of branch communication cables 12d, 12d ', 12''... (Not all are shown in the figure), and are connected to each connection target. To be done.

Thereafter, the trunk communication cables 11a and 11d, which are inserted downstream from the human hole 4b, are
A part 11d of the trunk communication cable is separated, and the remaining trunk communication cable 11a passes through the human hole 4c. In the same manner, the trunk communication cable 11 is wired while a part of the trunk communication cable 11 is connected to the branch communication cable 12 by the branch connection box 6.

In the above structure, the communication cable 11
A method of manufacturing the wiring structure M1 to the sewer pipe 1 of 12 will be described.

First, the planned area where the communication cable will be laid is set. In this planned area, the sewer network will be surveyed to confirm the positions of the main pipe 2, branch pipe 3, and manhole 4.
For each human hole 4, the number of branch pipes 3 provided in the main pipe 2 up to the next human hole 4 on the downstream side is checked. Then, the number of cores of the communication wire 23 required for each branch pipe 3 is calculated and summed. Generally, two to four cores are suitable as the communication wire 23 to be wired to each connection target. Then, the wiring structure M1 of the communication cables 11 and 12 is determined based on the number of communication strands 23 distributed to each branch pipe 3.

At this time, in an area near the source of the communication cables 11 and 12, the trunk communication cable 11 and the branch communication cable 12 are connected and wired to each connection target, and the trunk communication with a certain number of cores is provided in the downstream area. It is required to send the cable 11. Further, in an area where only terminal-like wiring is performed, it is required that the trunk communication cable 11 and the branch communication cable 12 are connected and wired to each connection target. It should be noted that the number of branch cables 12 distributed to each human hole 4 may be determined with a margin so that it can respond to future changes in the situation, regardless of the number strictly required. desirable. The branch communication cable 12 having a margin that is not wired to each connection target is housed in each human hole 4.

Incidentally, the wiring structure of the communication cables 11 and 12 is not limited to the wiring structure M1, but there are various wiring structures as will be described later. Therefore, if the setting is made in consideration of the characteristics of each method. Good. Then, the wiring structure thus set is laid in the sewer pipe 1.
Incidentally, the construction method of this wiring structure laying may be a conventionally known method.

As described above, the wiring structure M1 of the sewer pipe 1 (buried underground) of the communication cables 11 and 12 of the present embodiment is the main pipe 2 provided with the manhole 4 and the branch pipe 3. A plurality of trunk communication cables 11 are inserted therein, a part of the trunk communication cable 11 is connected to the branch communication cable 12 in the human hole 4, and the branch communication cable 12 is wired from the branch pipe 3 to a connection target. . As a result, the trunk communication cable 11 that is not connected to the branch communication cable 12 is not cut at the human hole 4, so that the connection point of the trunk communication cable 11 is lost, and the loss of the connection portion and the air between the cable connections are eliminated. The loss due to biting can be minimized. As a result, it becomes possible to construct an ideal communication infrastructure, and stable and highly reliable communication becomes possible.

In the present embodiment, the case where a part of the trunk communication cable 11 and the branch communication cable 12 are connected to each human hole 4 in the sewer pipe 1 has been described, but the present invention is not limited thereto. . That is, as shown in FIG. 6, only a part of the trunk communication cables 31 may have a wiring structure M2 in which the branch communication cables 32 are connected to each other through a plurality of manholes 4. According to the wiring structure M2, the trunk communication cable 3
1a can be sent downstream without connecting until the number of cores of the trunk communication cable 31b is exhausted.

More specifically, in the communication cable wiring structure M2 described above, the plurality of trunk communication cables 31a and 31b that have been input from the upstream side of the manhole 4a are separated from the branch communication cable 31b at the manhole 4a. The remaining trunk communication cable 31a passes through the human hole 4a. The part 31b of the trunk communication cable separated here is connected to the branch communication cable 32a and the trunk communication cable 31c in the branch connection box 6. The branch communication cable 32a is an arbitrary number of branch communication cables 32c, 32c ', 32c "... (not shown in the figure) for each branch pipe 3
Is wired to and connected to each connection target. Further, the trunk communication cable 31c is inserted into the branch connection box 6 of the human hole 4b.

The branch communication cable 31c is connected to the branch connection box 6 in the human hole 4b and the branch communication cable 32b.
And the trunk communication cable 31d. The branch communication cable 32b is an arbitrary number of branch communication cables 32d and 32.
.. (not all shown in the figure) are wired to the respective branch pipes 3 and connected to each connection target. Also, the trunk communication cable 32d is the human hole 4c.
The branch connection box 6 is inserted. At this time, the trunk communication cable 31a sent from the human hole 4a remains the same as the human hole 4b.
And is sent to the human hole 4c. Thereafter, similarly, the trunk communication cable 31d is wired while being connected to the branch communication cable 12 until the number of cores of the communication strand is consumed.

Further, in this embodiment, a plurality of manholes 4 are provided.
And a plurality of trunk communication cables 11 are inserted into the main pipe 2 in which an arbitrary number of branch pipes 3 are provided on the downstream side of each human hole 4, and A part of the trunk communication cable 11 is connected to the branch communication cable 12 and the downstream trunk communication cable at each human hole 4 so that the number of connections is determined based on the number of branch pipes 3. Four
The branch communication cables 12 connected with each other are wired to the branch pipes 3 corresponding to the respective human holes 4. This allows
Regarding the trunk communication cable 11 not connected to the branch communication cable 12, even if a plurality of human holes 4 are provided in the main pipe 2, until all of the trunk communication cable 11 is partially connected to the branch communication cable 12. Since it is not cut at each of these human holes 4, the connection point of the trunk communication cable 11 is eliminated, and the loss at the connection portion and the loss due to air trapping between cable connections can be minimized. As a result, it becomes possible to build an ideal communication infrastructure and stable and reliable communication becomes possible.

The case where a part of the trunk communication cable 11 is connected to each branch hole as the branch communication cable 12 has been described, but the present invention is not limited to this.
That is, as shown in FIG. 7, a plurality of trunk communications are provided in the main pipe 2 in which a plurality of human holes 4 are provided and an arbitrary number of branch pipes 3 are provided on the downstream side of each human hole 4. Cable 41
a. 41b is inserted, and trunk communication is performed at the upstream side human hole 4a so that the number of connections is determined based on the total number of branch pipes 3 from the upstream side human hole 4a to the downstream side human hole 4. A part 41b of the cable is connected to the branch communication cables 42a and 42b. The branch communication cables 42a and 42b are the branch communication cables 42c, 42c ', 42c "..., 42d.
42d ', 42d''... (not all shown in the figure), from the upstream human hole 4a to the downstream human hole 4
It may be a wiring structure M3 in which the branch pipes corresponding to c up to the connection target are wired. Thus, in the human hole 4a on the upstream side, the branch communication cable 42 for the branch pipe 3 corresponding to the human hole on the downstream side from the human hole 4a on the upstream side is created at one time. Cable 42
It is possible to reduce the work man-hour and the work time as compared with the case where each is created.

In the present embodiment, the trunk communication cable 11 may be a trunk communication cable in which a plurality of unit communication cables 21 containing a plurality of communication wires shown in FIG. 4 are combined. As a result, the trunk communication cable 11 is a combination of a plurality of unit communication cables 21. Therefore, it is only necessary to take out the required number of unit communication cables from the trunk communication cable 11 at the manhole 4 and the branch communication cable 12
The connection work can be performed easily and in a short time.

Further, as shown in FIG. 8, if the guide pipe 5 laid on the main pipe 2 is used, the trunk communication cable 11 formed by directly accommodating a plurality of communication wires 23 in the guide pipe 5. Can also be used. As a result, unlike the conventional trunk communication cable 11 shown in FIG. 3, the branch communication cable 12 can be separated from the trunk communication cable 11 without removing materials such as the tension material 22a and the jacket 22b. , High workability can be obtained.

Further, in the present embodiment, the guide tube 5
Is a plurality of thick holes 5a into which the trunk communication cable 11 is inserted,
And a pore 5b into which the branch communication cable 12 is inserted,
The pore 5b is set to have an internal height that is less than twice the outer diameter of the branch communication cable 12. As a result, each trunk communication cable 11 is inserted into each thick hole 5a,
It is possible to prevent the trouble that the guide tubes 5 are entangled with each other during the entry of the trunk communication cable 11. Further, even when a plurality of branch communication cables 12 are inserted into the same fine hole 5b, since the internal height of the fine hole 5b is set to less than twice the outer diameter of the fine branch communication cable 12, these branch communication cables 12 are There is no entanglement even when the cable 12 is being inserted.

In this embodiment, the case where the pores 5b are arranged on the side surface side with respect to the thick holes 5a has been described, but the invention is not limited to this.
That is, as shown in FIG. 9, the small holes 25b may be the guide tubes 25 arranged so as to be located below the thick holes 25a when laid inside the main tube 2. Thereby, for example, when a plurality of branch communication cables 12 are inserted into the pores 5b arranged on the side surface side, the branch communication cables 12 are independent so that the branch communication cables 12 do not overlap due to the influence of gravity. Although it is necessary to provide the partition wall 5c for entering the wires, if the pores 25b are arranged below, the branch communication cables 12 do not overlap with each other, so that the partition wall 25c that partitions the pores is unnecessary. be able to. The pores may be arranged above the large holes, and may be arranged above and below the large holes.

The number of large holes and fine holes formed in the guide tube is not limited, and as shown in FIG.
Many large holes 26a and many small holes 26b are formed by the partition wall 26c.
The guide tube 26 may be divided into Also, FIG.
As shown in FIG. 1, the thick wall may be divided into V-shapes by the partition wall 27d to form the thick hole 27a and the thick hole 27b, and the guide tube 27 may be formed with 27c on the side surface side. With these guide tubes, the trunk communication cable 1 in various forms
1 and the branch communication cable 12 can be inserted.

Further, in this embodiment, the trunk tension member 9 is inserted into the guide tube 5, and the trunk tension member 9 is applied with tension between the adjacent human holes 4 to guide the guide tube. 5 is supported on the upper wall side of the main pipe 2. As a result, the space above the main pipe 2 is moved to the guide pipe
Since it can be located at the laying position, it can be applied even when the sewage 14 (fluid) flows under the main pipe 2 like the sewer pipe 1.

Further, in this embodiment, the guide tube 5 can be supported on the upper wall side of the main tube 2 by the sag preventing material 60 shown in FIG. Slack prevention material 60
Has an outer diameter substantially corresponding to the inner diameter of the main pipe 2, and has a semicircular or ring-shaped cross section. Further, at least one slide portion 61 for slidably holding the guide tube 5 is formed in a part in the length direction thereof, and the slide portion 61 may be a recess or a space. The guide pipe 5 can be supported on the upper wall side of the main pipe 2 by mounting the slack preventing material 60 in the main pipe 2 at appropriate intervals. Therefore, as in the case where the trunk tension member 9 is used, it can be applied even when the waste water 14 (fluid) flows under the main pipe 2 such as the sewer pipe 1. If the main tension member 9 is used alone when the length of the main pipe 2 between the human holes 4 is long,
The gap between the guide pipe 5 and the upper wall of the main pipe 2 becomes large inside, and if the slack prevention material 60 is used alone, the number of slack prevention materials 60 used increases. In these cases, by appropriately using the trunk tension member 9 and the slack prevention material 60, the guide tube 5 can be more effectively supported on the upper wall of the main tube 2.

[0056]

The present invention will be described below with reference to examples.
The present invention is not limited to these examples. In this embodiment, wiring is performed by the wiring structures M1, M2, and M3. Table 1 shows the number of each wiring. The number of cores shown in Table 1 is the number of communication wires 23.

[0057]

[Table 1]

In Table 1, the following can be said. The wiring structure M1 includes trunk communication cables 11a, 11b,
In 11c and 11d, the number of cores of communication wires is subdivided into 40 cores, which is suitable for a terminal-like use in which the connection target is substantially fixed. Further, in the wiring structure M2, 200 cores are integrated in the trunk communication cable 31a and sent to the downstream side, and various wirings can be performed on the downstream side. The wiring structure M3 is the trunk communication cable 41a.
In the above, 400 cores are integrated and sent to the downstream, and 400 cores are distributed and used in the trunk communication cable 41b, and the downstream side has a very wide range and wiring is intensively and collectively performed for a wide range of connection targets. Suitable for doing.

[0059]

As described above, according to the first aspect of the present invention, a part of the trunk communication cable is connected to the branch communication cable, and the remaining trunk communication cable is not cut in the manhole. Therefore, the number of connection points of the trunk communication cable is minimized, and it is possible to minimize the loss at the connection portion and the loss due to air bites between the cable connections. As a result, it becomes possible to construct an ideal communication infrastructure, and stable and highly reliable communication becomes possible. Also, by inserting multiple trunk communication cables in the main, communication damage will be limited to some trunk communication cables even if some are broken, and normal trunk communication cables will be used temporarily. As a result, recovery work can be performed quickly.

According to the second aspect of the present invention, a part of the trunk communication cable is connected to the branch communication cables in a plurality of human holes, and the remaining trunk communication cables are all part of the trunk communication cables. It is not cut in each foramen until it is connected. Therefore, the number of connection points of the trunk communication cable is minimized, and it is possible to minimize the loss at the connection portion and the loss due to air bites between the cable connections. As a result, it becomes possible to construct an ideal communication infrastructure, and stable and highly reliable communication becomes possible.

According to the third aspect of the invention, a part of the trunk communication cable is branched in the upstream human hole based on the total number of branch pipes provided from the upstream human hole to the downstream human hole. Connected to the cable, the remaining trunk communication cable is not cut in these manholes. Therefore, the number of connection points of the trunk communication cable is minimized including 1, and the loss at the connection portion and the loss due to air trapping between cable connections can be minimized. As a result, it becomes possible to construct an ideal communication infrastructure, and stable and highly reliable communication becomes possible.
Further, since the branch pipe cable is created at one time in the upstream human hole, the work process can be reduced and the work time can be shortened as compared with the case where the branch communication cable is created once in each human hole. be able to.

According to the invention of claim 4, the trunk communication cable is a combination of a plurality of unit communication cables, and the number of trunk communication cables used in claims 1 to 3 can be reduced. Further, the work of connecting to the branch communication cable can be performed easily and in a short time only by taking out the required number of unit communication cables from the trunk communication cable.

According to the fifth aspect of the present invention, even if a material such as a tension material or a thick jacket is not used unlike an outdoor cable normally used as a trunk communication cable, it can be housed in a guide tube. No tension is applied directly to the communication cable, and the outer surface is protected. With this, unlike the conventional case, the trunk communication cable can be connected to the branch communication cable without removing the materials such as the tension material and the outer cover, so that high workability can be obtained. Therefore, a simple cable such as an outdoor cable can be used as the trunk communication cable.

According to the invention of claim 6, since the space above the main pipe can be set as the laying position of the guide pipe, it can be applied even when the fluid flows to the lower side of the main pipe like a sewer pipe. it can.

According to the invention of claim 7, since the space above the main pipe can be set as the laying position of the guide pipe, it can be applied even when the fluid flows to the lower side of the main pipe like a sewer pipe. it can.

According to the invention of claim 8, since the trunk communication cables are respectively inserted into the respective thick holes, it is possible to prevent the trouble that the trunk communication cables are entangled in the guide tube while the trunk communication cables are being inserted. Further, even when a plurality of branch communication cables are inserted into the same fine hole, the inside height of the fine holes is set to less than twice the outer diameter of the branch communication cable, and therefore, while the branch communication cables are being entered. There is no entanglement even in.

According to the ninth aspect of the present invention, for example, when a plurality of branch communication cables are inserted into the pores arranged on the side surface side, the branch communication cables are branched so as not to overlap due to the influence of gravity. It is necessary to provide a partition wall to independently enter the communication cables, but by arranging the pores above and below, the branch communication cables do not overlap each other, so the partition wall can be made unnecessary. .

[Brief description of drawings]

FIG. 1 is a cross-sectional view illustrating an underground buried conduit wiring structure of a communication cable.

FIG. 2 is a sectional view of a guide tube.

FIG. 3 is a cross-sectional view illustrating a usage state of a guide tube.

FIG. 4 is a cross-sectional view illustrating a usage state of a guide tube.

FIG. 5 is a sectional view of a human hole.

FIG. 6 is a cross-sectional view illustrating an underground buried conduit wiring structure of a communication cable.

FIG. 7 is a cross-sectional view illustrating a buried underground conduit wiring structure of a communication cable.

FIG. 8 is a cross-sectional view illustrating a usage state of the guide tube.

FIG. 9 is a sectional view of a guide tube.

FIG. 10 is a sectional view of a guide tube.

FIG. 11 is a sectional view of a guide tube.

FIG. 12 is a perspective view of a slack preventing material.

FIG. 13 is a cross-sectional view illustrating a conventional underground buried conduit wiring structure of a communication cable.

[Explanation of symbols]

2 mains 3 branch pipes 4 person hole 11 trunk communication cable 12-branch communication cable

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H02G 1/06 305 H02G 1/06 309J 309 311B 311 G02B 6/00 351 (72) Inventor Fumiaki Tsuchiya Chiba Prefecture 2-2-2-209 Shioyaki, Ichikawa-shi (72) Izaburo Yagi 4-11-10 Nishi-Namba-cho, Amagasaki-shi, Hyogo (72) Koji Aso 2-3-3-21 Matsuyama-cho, Yao-shi, Osaka F-term ( Reference) 2D063 BA11 BA20 2H038 CA68 3H111 AA01 BA15 BA25 BA26 BA28 BA29 CA15 CA27 CB28 CB29 DB17 DB23 5G369 AA19 BA04 BA06 DC03 EA01

Claims (9)

[Claims] 1. A plurality of trunk communication cables are inserted into a main pipe having a human hole and a branch pipe, and a part of the trunk communication cable is connected to the branch communication cable in the human hole, A buried underground conduit wiring structure for a communication cable, wherein the communication cable is wired from the branch pipe to a connection target. 2. A plurality of trunk communication cables are inserted into a main pipe in which a plurality of human holes are provided and an arbitrary number of branch pipes are provided on the downstream side of each human hole. So that the number of connections determined based on the number of branch pipes on the downstream side is, a part of the trunk communication cable is connected to each branch communication cable at each of the human holes, and the connection is made at each of the human holes. The underground communication conduit wiring structure of the communication cable, wherein the branch communication cable is wired from the branch pipe corresponding to each human hole to the connection target. 3. A plurality of trunk communication cables are inserted into a main pipe provided with a plurality of human holes, and an arbitrary number of branch pipes are provided on the downstream side of each human hole. A part of the trunk communication cable is connected to the branch communication cable in the upstream human hole so that the number of connections is determined based on the total number of branch pipes from the hole to the human hole on the downstream side, A underground communication conduit wiring structure for a communication cable, wherein a branch communication cable is wired from a branch pipe corresponding to the upstream human hole to a downstream human hole to a connection target. 4. The plurality of trunk communication cables are formed from trunk communication cables in which a plurality of unit communication cables accommodating a plurality of communication strands are combined, and a part of the trunk communication cables is a unit communication cable. It corresponds to a part, The underground buried pipeline wiring structure of the communication cable of any one of Claim 1 thru | or 3 characterized by the above-mentioned. 5. The communication cable according to claim 1, wherein the trunk communication cable is formed by being housed in a guide pipe laid on the main pipe. Underground pipeline wiring structure. 6. A trunk tension member is inserted through the guide tube, and the trunk tension member is tensioned between adjacent manholes to support the guide tube on the upper wall side of the main tube. 6. The method according to claim 5, wherein
Underground pipeline wiring structure of the communication cable described in. 7. The guide tube has an outer diameter substantially corresponding to the inner diameter of an existing pipeline, and has an arc shape or a ring shape with at least a semicircle or more in cross section, and the guide is provided at a part of its length direction. The guide pipe is supported on the upper wall side of the main pipe by attaching slack preventing materials having at least one slide portion for slidably holding the pipe at appropriate intervals. The underground buried conduit wiring structure for a communication cable according to claim 5. 8. A guide pipe for laying a plurality of trunk communication cables on a main pipe, the guide pipe having a plurality of large holes through which the trunk communication cables are inserted and pores through which the branch communication cables are inserted. The guide tube is characterized in that the pores are set to an inner height of less than twice the outer diameter of the branch communication cable. 9. The pores are arranged so as to be located above and / or below the large holes when the guide pipe is laid inside the main pipe. The guide tube according to item 8.