JP2006121800A - Cable laying method using underground pipe and underground pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cable laying method using a buried underground pipe capable of simplifying underground buried pipes for storing cables such as power cables and communication cables, easiness of construction, and expanding an applicable portion, and this laying method. Provide underground pipes used in
SOLUTION: The inside of the underground pipe 1 is divided into two parts by using a separating plate 21, a trunk cable 6 accommodated in a sheath pipe 41 is inserted into one of them, and a branch cable 5 branched from the trunk cable 6 is inserted into the other. In addition to being inserted, the branch cable 6 is separated into the branch pipe 9 using the branch pipe joint 8 provided in the underground pipe 1, and wired to the consumer via the branch pipe 9.
[Selection] Figure 7

Description

  The present invention relates to a method of laying a cable used for communication, electric power, broadcasting, etc. in the ground using an underground pipe, and an underground pipe used in this laying method. It belongs to communication cable laying technology.

  In order to enhance road scenery and ensure smooth road traffic, communication cables such as power cables, telephone lines, CATV cables, and cable for cable broadcasting are basically buried in the ground. They are mainly installed in a common cable groove (C.C.C.BOX) provided under the road (sidewalk) in a plurality of underground buried pipes with high shape retention according to applications such as electric power and communication. It is housed and laid in a sheath tube for heavy protection. In addition to the trunk cable, there are also underground underground pipes, usually called free access pipes, for storing branch cables branched from the trunk cables in order to distribute power and communications to consumers. ing.

These power cables and communication cables tend to increase both in two dimensions and in three dimensions as communication demand increases. From highways with wide sidewalks to roads with narrow sidewalks, Or they are laying under roads without sidewalks.
On the other hand, laying the cable to each consumer uses the branch cable provided in the above-mentioned free access pipe, connecting the branch pipe to the branch pipe joint provided in the free access pipe, and via the branch pipe It is done.

  In such a situation of increasing laying amount, there is a strong demand for simplicity of construction, simplification of structure, reduction of cost, etc. for the common cable groove and underground buried pipe, and various proposals corresponding to it It has also been made.

  For example, in Japanese Patent Application Laid-Open No. 2003-47118 (Patent Document 1), a buried pipe for optical communication cable is a polyethylene corrugated pipe, and a polyethylene inner pipe 3 through which a plurality of optical communication cables can be inserted. At least one or more inner pipes can be inserted inside the buried pipe by arranging them continuously, adjoining, without being adjacent to the inner pipe at both ends, and being fixed to the inner peripheral surface of the buried pipe It has been proposed to have a structure in which a large space for expansion is formed.

Moreover, in Unexamined-Japanese-Patent No. 2003-143725 (patent document 2), the cross-sectional ring shape which was provided in the outer periphery of the main cable burial pipe of circular cross section and the main cable burial pipe, and the inside was formed in the some accommodation partition chamber. An underground cable pipe has been proposed which consists of a sub-cable buried pipe.
Japanese Patent Laying-Open No. 2003-47118 (Claims, FIG. 1) JP 2003-143725 A (Claims, FIG. 1)

  In view of the present situation, the present invention simplifies power cables, communication cables, and underground underground pipes for accommodating those branch cables, and further, a common groove for accommodating the cables, ease of construction, It has been studied for expansion.

The inventors have intensively studied to solve the above problems, and divide the inside of the underground pipe having a circular cross section with a separating plate, and insert a trunk cable on one side and a branch cable on the other side. Cable laying in the house is done by attaching a branch pipe joint directly to the underground pipe where the trunk cable and branch cable are stored, and from there through the branch pipe, and further being housed in the sheath pipe The present invention has been completed by finding that the above-mentioned problems can be solved by fixing the existing trunk cable with a sheath tube holding member provided on the separation plate.

That is, the invention according to claim 1 of the present invention is
Divide the inside of the underground pipe using a separator,
Insert a trunk cable in a sheath tube into one of them,
While letting the other side pass the branch cable branched from the main line cable,
Using the underground pipe characterized in that the branch cable is separated into a branch pipe using a branch pipe joint provided in the underground pipe, and wired to a consumer through the branch pipe Cable laying method.

The invention according to claim 2 of the present invention is
In the cable laying method using the underground pipe according to claim 1,
Branching from the trunk cable of the branch cable,
It is characterized by being performed in a manhole or handhole.

The invention according to claim 3 of the present invention is
In the cable laying method using the underground pipe according to claim 1,
The sheath tube is
It is characterized by being fixed to the separation plate by a sheath tube holding member provided on the separation plate.

Further, the invention according to claim 4 of the present invention is
The underground cable is provided with a separating plate that protects the trunk cable and the branch cable from the trunk cable together, and bisects the inside of the underground pipe and separates and inserts each of them. It is a buried pipe.

The invention according to claim 5 of the present invention is
The underground pipe according to claim 4,
The separation plate is
The width is similar to the inner diameter of the buried pipe, and when placed in the underground buried pipe, both ends in the width direction are in contact with the inner wall of the buried pipe, and the plate-like body bisects the buried pipe. It is.

The invention according to claim 6 of the present invention provides
In the underground pipe according to claim 5,
The separation plate is
Arc-shaped plates that are in contact with the inner peripheral portion of the underground pipe are respectively provided in the vertical direction at both ends in the width direction.

The invention according to claim 7 of the present invention provides
In the underground pipe according to claim 5 or 6,
The separation plate is
It has a sheath tube holding member which fixes the sheath tube which accommodates a trunk line cable, It is characterized by the above-mentioned.

The invention according to claim 8 of the present invention provides
In the underground pipe according to any one of claims 5 to 7,
The separation plate is
It is characterized by being arranged with a required interval in the tube axis direction of the underground buried tube.

The invention according to claim 9 of the present invention provides
In the underground pipe according to any one of claims 5 to 7,
The separation plate is
It is characterized by being continuously arranged in the tube axis direction of the underground tube.

The invention according to claim 10 of the present invention provides
In the underground pipe according to claim 9,
The continuous arrangement of the separating plates is:
It is characterized by comprising only a combination of separation plates made of plate-like bodies, or a combination of a separation plate made of plate-like bodies and a separation plate having an arc plate.

The invention according to claim 11 of the present invention provides
In the underground pipe according to claim 9 or 10,
The combination of the separating plates is
It is characterized by comprising a combination of a short length separating plate and / or a long length separating plate.

The invention according to claim 12 of the present invention provides
In the underground pipe according to any one of claims 9 to 11,
The separation plate is
At least one end in the tube axis direction has a connecting portion for connecting and holding connecting plates that connect the separating plates or connecting the separating plates to each other.

The invention according to claim 13 of the present invention provides
The underground pipe according to claim 12,
The connecting plate is
In the tube axis direction, they are formed to be mutually connectable by a coupler such as a pin, a screw, or a bolt.

The invention according to claim 14 of the present invention provides
The underground pipe according to claim 12,
The connecting plate is
Each of them has a long groove extending in the tube axis direction, and is formed so as to be slidable in the tube axis direction by being coupled to each other by a coupler in a state where the end portions are overlapped with each other.

  The underground pipe laying method according to the present invention is such that the underground pipe is divided into upper and lower or left and right, a trunk cable is arranged on one side, a branch cable is arranged on the other side, and the branch pipe is directly connected via a branch pipe joint. Since the branch pipe for inserting and laying the branch cable is connected, the number of buried pipes necessary for laying the cable can be reduced, and a compact pipe structure can be realized.

  In particular, in the underground pipe laying method of the present invention, the number of underground pipes to be buried in the ground can be reduced as much as possible, so that the depth of excavation for burial is reduced. Therefore, excellent effects such as saving labor can be achieved.

  In the underground pipe of the present invention, the separation plate is formed by a plate-like body that approximates the inner diameter of the underground pipe, and the underground pipe is divided into two parts in the vertical and horizontal directions by this separation plate. By disposing the branch cable on the other side of the main line cable, the inside of the pipe line can be neatly divided according to the application.

  In particular, in the underground pipe of the present invention, by forming a sheath pipe holding member on one surface of the separation plate, it is possible to hold the trunk cable in the sheath pipe and to insert the trunk cable, Branching can be facilitated, and the arrangement of the trunk cables can be facilitated, interference between the trunk cables can be eliminated, and the laying operation can be greatly simplified.

Further, by forming a sandwiching portion at the end of the separation plate in the tube axis direction, even if the separation plate is disposed with a required interval, the separation plate is simply connected by a plate-like connection plate, and the tube The entire road can be divided into two easily and easily.

  Hereinafter, a cable laying method using a buried underground pipe according to the present invention and a buried underground pipe will be described in detail with reference to the accompanying drawings. FIG. 1 is an example of a buried underground pipe according to the present invention. FIG. 2 is a sectional view of the tube axis direction.

  As is clear from FIGS. 1 and 2, reference numeral 1 denotes an underground pipe having a required length in the present invention, and the inside of the underground pipe is disposed with a required interval. Is divided into two parts up and down.

  As long as the separation plate 2 that bisects the inside of the underground tube 1 can bisect the inside of the underground tube 1, there are no particular restrictions on its shape and length, but basically, A plate-like body having a length of about 20 to 30 cm is easy to carry and suitable for field work and the like, and the bisection in the tube may be in the vertical direction.

  Since the separating plate 2 divides the inside of the underground pipe 1 into two, by making the width equal to the diameter of the underground pipe 1, the inside of the pipe can be equally divided into two vertically. Of course, depending on the number of cables to be inserted, the cable may be biased upward or downward.

  In addition, as shown in FIG. 3, the separation plate 2 has a shape in which a part of a cylindrical tubular portion is missing in order to organize and hold the trunk cable 6 disposed in the lower space at least on the lower surface thereof. The sheath tube holding member 3 is provided. After the sheath tube 4 is engaged and held by the sheath tube holding member 3, the trunk cable 6 is laid inside the sheath tube 4. In the upper space, branch cables 5, 5,... Branched from the main cable 6 in a manhole or handhole are inserted.

  The separation plate 2 employing the above-described configuration is stably placed in the underground tube 1 by the weight of the sheath tube 4 fixed to the sheath tube holding member 3. Further, in this example, the separation plate 2 is intermittently installed in the underground pipe 1 with a predetermined interval, but the sheath pipe 4 fixed by the sheath pipe holding member 3. Therefore, the underground buried pipe 1 is clearly separated vertically, so that the trunk cable 6 and the branch cable 5 do not interfere with each other, and the cable is easily laid.

In addition, 7 in FIG. 2 has shown the space for sheath tube expansion.
FIG. 4 shows another example of the separation plate 2 used in the underground pipe 1 of the present invention, and shows an example in which the main structure of the sheath tube holding member 3 is cylindrical.

  The separation plate 21 shown in FIG. 5 is a long type used for partitioning the entire pipeline of the underground pipe 1 and has a length of about 70 to 100 cm. As shown in FIG. 6, the separation plates 21 and 21 are continuously installed in the underground pipe 1A with a slight gap X, and the inside of the underground pipe 1A. Are separated.

  At this time, the separation plate 21 is a fitting uneven portion formed at both ends of the plate-like body, or a joint having a fitting uneven portion, particularly a separation plate that also serves as a joint described later, and further, a pin, a screw It is also possible to couple with a coupling tool such as a bolt, and it is preferable to form a complete continuous body.

Further, in this embodiment, as shown in FIG. 7, as the separation plate 21, one in which the sheath tube holding members 31, 31 are formed in parallel is used, but the long separation plate 21 is continuously formed. Alternatively, when used in combination, the underground pipe 1 </ b> A is clearly divided into two vertically by the separation plate 21, so that the separation plate 2 without the sheath tube holding member 3 can be used. .
Reference numeral 42 denotes a small-diameter sheath tube that is not fixed to the separation plate 21.

  The underground pipe 1A has a branch pipe joint 8 formed in the middle of the pipe. The branch cable 5 in the pipe is drawn out to the branch pipe 9 through the branch pipe joint 8, and this branch pipe 9 will be laid at the consumer.

  The separation plate 22 shown in FIGS. 8 to 10 can also be used as a joint, and can be positioned in the underground pipe, that is, can be fixed at substantially the center in the pipe. Arc-shaped plates 10 and 11 are integrally formed in the vertical direction in the left and right central portions of the plate-like body 22a having a width (about 130 mm) narrower than the diameter of the buried pipe and a required length (about 30 mm), respectively. On the upper and lower surfaces of the plate-like body 22a, the plate-like bodies 12, 12 having a width of about 130 mm and a length of about 70 mm are overlapped and integrated so as to protrude about 20 mm from the front and rear end faces of the plate-like body 22a. In this way, a sandwiching portion Y that is a connecting portion is formed between the plate-like bodies 12 and 12.

  The separation plate 22 having such a configuration is arranged in the underground pipe 1 with a necessary interval as shown in FIG. 11, so that the outer surface of each of the circular arc plates 10 and 11 is grounded as shown in FIG. The separation plate 22 is fixed and held at a substantially central portion in the underground pipe 1 in close contact with the inner peripheral surface of the underground pipe 1.

At that time, by inserting the end portion of the connecting plate 23 having a required length into the sandwiching portions Y, Y formed on the respective separation plates 22, the inside of the underground tube 1 is almost completely up and down over the entire length. Can be divided into two.
In addition, the formation of the sandwiching portion Y is not limited to the embodiment, and although not shown, a plate having a required width is attached to each of the upper and lower surfaces of the front and rear ends of the plate-like body 22a. Can also be formed.

  The arc plates 10 and 11 formed at the center of the left and right side surfaces of the separation plate 22 are formed in an arc shape so as to be in close contact with the inner peripheral surface of the underground tube 1, so Even if there is some error in the inner diameter of the inner buried pipe 1, the arcuate plates 11 and 11 have some elasticity so that they can be adjusted.

  In addition, when the underground pipe 1 is bent in an arc shape, for example, as shown in FIG. 14, it is a separation plate as shown in FIG. 2, 2... Can be arranged in parallel by changing the angle little by little to correspond to the bent portion.

  FIG. 16 shows a connecting plate 24 used when the underground buried pipe 1 is bent in an arc shape. Each connecting plate 24 is provided at the front and rear ends of the plate-shaped main body 24a, and one is a plate. The projecting edges 24b and 24c are integrally formed on the upper side of the main body 24a and the other side is symmetrical on the lower side, and pin insertion holes 25 are formed in the centers of the distal ends of the projecting edges 24b and 24c, respectively. It is a thing.

  Therefore, as shown in FIG. 18, after the separating plates 22 and 22 are disposed at the required positions of the underground pipe 1 bent in an arc shape, the connecting plates are connected between the separating plates 22 and 22. .. Are connected to each other by a pin 26 to separate the inside of the pipeline.

  In addition, since underground pipe 1 expands and contracts in the length direction due to earthquakes and temperature changes, or in order to carry out spear enforcement at the time of final connection, appropriate measures are taken when connecting underground pipes 1 in various places. Therefore, as a matter of course, the separating plate disposed in the underground pipe 1 is also required to have a function of absorbing some expansion and contraction and a spear function.

  Therefore, the underground pipe 1 shown in FIG. 19 and FIG. 20 is provided on the fixed plate 13 when the distal end portion is inserted into the connecting pipe 14 provided on the fixed plate 13 fixed to a wall surface such as a manhole. The sandwiching plates 15 and 15 and the separation plate 22 are connected to each other by three connecting pipes 16, 17 and 18 so as to partially overlap each other, and the lengths of the connecting plates 16, 17 and 18. The long grooves Z, Z formed in the center of the direction are connected to each other by pins 19 and the connecting plate is slid in the front-rear direction along each long groove Z to correspond to expansion and contraction.

In the above embodiment, when dividing the entire pipeline in the underground pipe 1 into two parts, when the separators are connected to each other, the separators arranged with a necessary interval are connected to each other by the connector. In the case where the separation plates are long and short, combinations of long separation plates, long and short separation plates, short separation plates, and the like are possible.
Further, even when the separation plates are arranged with a space in the pipeline, only a short or long separation plate may be a combination of both.

This invention, when laying cables used for communication, power, broadcasting, etc. using underground buried pipes, by reducing the number of buried pipes required for laying by making the piping structure compact, Cable insertion, arrangement and branching are easy, laying work is greatly simplified, and the excavation depth can be reduced. It is used in various industries that use

It is explanatory drawing which shows an example of the underground pipe concerning this invention. It is sectional drawing of the pipe-axis direction of the underground pipe shown in FIG. It is explanatory drawing which shows an example of the separation plate used in FIG. It is explanatory drawing which shows the other example of the separation plate used in FIG. It is explanatory drawing which shows the further another example of a separation plate. It is explanatory drawing which shows the usage example of the separating plate shown in FIG. It is sectional drawing of the pipe-axis direction of the underground pipe shown in FIG. It is explanatory drawing which shows the further another example of a separation plate. It is a top view of the separation plate of FIG. FIG. 9 is a side view of the separation plate of FIG. 8. It is explanatory drawing which shows the use condition of the separating plate shown in FIG. It is sectional drawing which shows the use condition of the separating plate shown in FIG. It is sectional drawing of the pipe axis direction of the underground pipe shown in FIG. It is explanatory drawing which shows the example of arrangement | positioning of the separation plate to the underground pipe | tube which has a curved part. It is a longitudinal cross-sectional view in FIG. It is a top view which shows an example of the connection board used in this invention. It is sectional drawing of the connection board shown in FIG. It is a cross-sectional view of an underground pipe using the connecting plate shown in FIG. It is a cross-sectional view showing an example of the pipe end of the underground pipe. It is a longitudinal cross-sectional view of the underground pipe shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Underground pipe 2, 21, 22, Separation plate 3,31 Sheath pipe holding member 4 Sheath pipe 5 Branch cable 6 Trunk cable 10, 11 Arc board 12 Plate body 13 Fixed board 14 Connection pipe 15 Clamping board 16, 17 , 18 Connecting plate 23,24 Other connecting plate

Claims (14)

Divide the inside of the underground pipe using a separator,
Insert a trunk cable in a sheath tube into one of them,
While letting the other side pass the branch cable branched from the main line cable,
Using the underground pipe characterized in that the branch cable is separated into a branch pipe using a branch pipe joint provided in the underground pipe, and wired to a consumer through the branch pipe Cable laying method. Branching from the trunk cable of the branch cable,
The cable laying method using the underground pipe according to claim 1, wherein the cable is laid in a manhole or a handhole. The sheath tube is
The cable laying method using the underground pipe according to claim 1, wherein the cable is fixed to the separation plate by a sheath tube holding member provided on the separation plate.   The underground cable is provided with a separating plate that protects the trunk cable and the branch cable from the trunk cable together, and bisects the inside of the underground pipe and separates and inserts each of them. Buried pipe. The separation plate is
It is a plate-like body whose width approximates to the inner diameter of the buried pipe, and when placed in the underground buried pipe, both ends in the width direction abut against the inner wall of the buried pipe and bisect the inside of the buried pipe. Item 4. The underground pipe according to item 4. The separation plate is
6. The underground pipe according to claim 5, wherein arc-shaped plates that are in contact with the inner peripheral portion of the underground pipe are respectively provided in the vertical direction on both ends in the width direction. The separation plate is
The underground pipe according to claim 5 or 6, further comprising a sheath pipe holding member that fixes a sheath pipe that houses the trunk cable. The separation plate is
The underground pipe according to any one of claims 5 to 7, wherein the underground pipe is arranged at a predetermined interval in a pipe axis direction of the underground pipe. The separation plate is
The underground pipe according to any one of claims 5 to 7, wherein the underground pipe is continuously arranged in a tube axis direction of the underground pipe. The continuous arrangement of the separating plates is:
10. The underground pipe according to claim 9, wherein the underground pipe is constituted by a combination of only a separation plate made of a plate-like body, or a combination of a separation plate made of a plate-like body and a separation plate having an arc plate. The combination of the separating plates is
The underground pipe according to claim 9 or 10, wherein the underground pipe is composed of a combination of a short separation plate and / or a long separation plate. The separation plate is
The connecting part for connecting and holding the connecting plates for connecting the separating plates or connecting the separating plates to each other is provided at at least one end in the tube axis direction. Underground pipe as described in Crab. The connecting plate is
13. The underground pipe according to claim 12, wherein the underground pipe is formed so as to be mutually connectable by a coupler such as a pin, a screw, or a bolt in the pipe axis direction. The connecting plate is
13. Each of them has a long groove extending in the tube axis direction, and is formed so as to be slidable in the tube axis direction by being coupled to each other by a coupler in a state where the end portions are overlapped with each other. Underground pipe.