JPH10309015A - Method for constructing main cable for building and main cable unit used for it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for constructing a main cable for a building which requires no temporary power supply cable for construction. SOLUTION: Connectors 5A, 5B are fixed to both ends of a main cable 3 of a unit length equivalent to that for one story of a building to prepare a main cable unit 1 with a branch cable 7 connected on one end. This main cable unit 1 is extended up to the next upper story by coupling the connectors 5A, 5B as the construction of a building progresses. During the construction of the building, a branch cable 7 is connected to a temporary distribution board 13 provided for the construction on each story and the connected body of the main cable units 1 is used as a temporary power supply cable for the construction. After the finish of the construction using a temporary power supply, the branch cable 7 is connected to a regular distribution board and the connected body of the main cable units 1 is used as the main cable for the building.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a trunk cable for a building and a trunk cable unit used for the method.

[0002]

2. Description of the Related Art Conventionally, as a trunk cable for supplying power to each floor of a building, a so-called building harness in which a branch cable for each floor is connected in the middle of a long trunk cable passing through almost all floors of the building. Used. This building harness is laid in the vertical wiring space of the building when the building reaches the top floor.

On the other hand, when building a building, a temporary power cable for construction is required to operate various tools and construction machines used at the construction site. This temporary power cable for construction is laid in a place different from the space for laying the building harness described above, is used only during construction, and is removed when the building is completed. Since the above-mentioned harness for a building is laid after being completed to the top floor of the building, it cannot be used as a power cable for construction.

The following proposals have also been made regarding temporary power cables for construction. That is, JP-A-7-1584
No. 2 discloses that during the construction of a building, a temporary power trunk is constructed by sequentially connecting cables with connectors attached to both ends, and after completion of the building construction, the temporary connection is cut off by disconnecting the connector. It is disclosed that a main line is dismantled and brought to another building construction site for reuse. Japanese Patent Application Laid-Open No. 7-163030 discloses that, during building construction, a distribution board for introducing electric power and a plurality of temporary distribution boards are connected by cables having connectors attached to both ends. It is disclosed that the garbage can be collected and reused at another building construction site.

[0005]

In the conventional temporary power cable for construction, a wiring space dedicated to the construction is provided separately from a space for laying an original trunk cable of the building.
Since it is to be installed there, it is difficult to secure an installation place in a complicated construction site, and there is also a problem that the construction work space is squeezed.

In order to lay a temporary construction power cable in the vertical direction, it is necessary to make a hole in the floor and lay the cable. After the work is completed, the cable is removed and the hole made in the floor is closed. There is a need. For this reason, there is a problem that construction costs are high both when laying and when removing. The conventional temporary power cable for construction is used only during construction,
It is removed when the building is completed, and even if it is reused after removal, there is a problem that it costs money to store the removed cable and perform maintenance and inspection.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a construction method of a building trunk cable which does not require a temporary construction power cable, and a trunk cable unit used therefor.

[0008]

SUMMARY OF THE INVENTION According to the present invention, there is provided a method of installing a trunk line cable for a building, wherein a connector is attached to both ends of a unit length trunk line cable having a length corresponding to one floor or a plurality of floors of a building, and the unit is connected to the unit. Prepare a trunk cable unit that connects the required number of branch cables to the long trunk cable, and connect these trunk cable units to each other with the connector in the vertical wiring space of the building as the building construction progresses By gradually extending to the upper floor, during the construction of the building, connect the branch cable of the trunk cable unit to the temporary distribution board for construction on each floor, and use the connected body of the trunk cable unit as a temporary power cable for construction. After the construction using the temporary power supply is completed, connect the branch cable of the trunk cable unit to a regular distribution board, and connect the trunk cable. It is characterized in that use connection of knit as for buildings trunk cable.

According to this method, the connecting body of the trunk cable unit can be used as a temporary power cable for construction during building construction, and the connecting body of the trunk cable unit can be used as it is as a building trunk cable after construction is completed.
This eliminates the need for a temporary power cable dedicated to construction as in the past. Therefore, it is not necessary to secure a space for installing a temporary power cable at a construction site, and it is possible to reduce costs for laying and removing the temporary power cable, and costs for storage and maintenance and inspection.

[0010] At the time of construction, temporary power supplies are required on all floors. However, distribution boards are not necessarily installed on all floors in a completed building. After the construction, some of them are not connected to the proper distribution board. Such a branch cable is desirably cut to an appropriate length as necessary, and then subjected to an insulation treatment at its end to prepare for later use (such as additional wiring).

In the trunk cable unit used in the construction method of the present invention, connectors are attached to both ends of a unit length trunk cable having a length of two stories of a building, and branch cables are attached to both ends of the unit length trunk cable. Preferably, they are connected.

It is preferable that the length of the unit length trunk cable be the length of the second floor of the building because it is versatile and easy to construct. Also, if you make it the length of the second floor of the building,
Since the number of connectors to be used is small and the insulation treatment only for the branch cable connection portion is not required, the cost can be reduced. Since the branch cable is used by connecting to a temporary distribution board at the site under construction, it is preferable that the branch cable has sufficient flexibility and damage resistance. Preferably, a cable is used.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. [Embodiment 1] In this embodiment, a trunk cable unit as shown in FIG. 1 is used. In this trunk cable unit 1, a female connector 5A is attached to one end of a unit length trunk cable 3 having a length of one floor of a building, a male connector 5B is attached to the other end, and a branch cable is attached to one end of the unit length trunk cable 3. 7 are connected. Branch cable 7
Is crimped to the female connector 5A together with the end of the unit length trunk cable 3 or the female connector 5A
The crimping is performed by using a C-shaped sleeve or the like to crimp the unit length trunk cable 3 at the mouth. The connecting portions of the male connector 5A and the branch cable 7 are collectively covered with an insulator. As the unit length trunk cable 3, a vinyl insulated vinyl sheath cable or a crosslinked polyethylene insulated vinyl sheath cable or the like is used as in the case of the conventional trunk cable. As the branch cable 7, a cable of the same type as the trunk cable can be used, but a cabtire cable can also be used.

Although FIG. 1 shows the main cable unit 1 for only one phase for the sake of simplicity of description, in the case of three-phase power supply, there are three main cable units 1 and one set. In case of supply, 2 trunk cable units 1
One set is included in the book (the same applies to the following drawings).

Next, a method of constructing a building trunk cable using the trunk cable unit 1 will be described with reference to FIGS. First, when the floor and ceiling on the first floor of the building are completed, as shown in FIG. 2, a temporary power receiving facility 9 for construction is installed on the first floor, and a trunk cable 11 of a required length is connected thereto. The female connector 5A and the branch cable 7 are connected to the end of the trunk cable 11 in advance. The unit including the trunk cable 11, the female connector 5A, and the branch cable 7 has a configuration in which the male connector 5B of the trunk cable unit 1 in FIG. 1 is omitted. If temporary power receiving equipment 9
If the female connector is attached to the output end of the main cable unit 1, the trunk cable unit 1 of FIG. 1 can be used as it is. Next, a temporary distribution board 13 for construction is placed at an appropriate location on the first floor.
Is installed, and the tip of the branch cable 7 is connected thereto. With this, a power source for operating various tools and construction machines can be secured on the first floor, and necessary work is performed on the first floor.

Next, when the floor on the second floor (the ceiling on the first floor) and the ceiling are completed, the trunk cable unit 1 shown in FIG.
And the male connector 5B is connected to the female connector 5A on the first floor after passing through the hole 15 on the floor. The hole 15 is formed in advance in a part of the vertical wiring space when the floor is formed. Next, a temporary distribution board 13 for construction is installed at an appropriate position on the second floor, and the tip of the branch cable 7 is connected thereto. This means that the power supply for operating various tools and construction machines on the second floor has been secured.
Perform necessary work on the second floor.

The installation position of the temporary distribution board 13 is not limited to the vertical wiring space, but can be selected at any position within a range where the branch cable 7 can reach. In order to be able to select the installation position of the temporary distribution board 13 to some extent freely according to the situation at the construction site, the branch cable 7 must be used.
Is preferably as long as possible, for example, longer than the length of one floor as shown in FIG.

Next, when the floor on the third floor (the ceiling on the second floor) and the ceiling are completed, the trunk cable unit 1 shown in FIG. To the female connector 5A on the second floor. Then 3
A temporary distribution board 13 for construction is installed at an appropriate position on the floor, and the tip of the branch cable 7 is connected thereto. With this, a power source for operating various tools and construction machines can be secured on the third floor, and necessary work is performed on the third floor.

As described above, the trunk cable unit 1 is gradually extended to the upper floor by connecting the connector as the construction of the building progresses, and during the construction of the building, the connecting body of the trunk cable unit 1 is used for construction. Used as a temporary power cable.

When the building is completed up to the top floor and the construction using the temporary power supply is completed at each floor, a regular distribution board 17 is installed in the vertical wiring space of each floor as shown in FIG. Regular distribution board 1 separated from the board
Connect to 7. The temporary switchboard will be removed at this stage. On the first floor, the temporary power receiving equipment for construction is removed and the regular power receiving equipment 19 is installed. Therefore, the trunk cable 9 on the first floor is connected to the regular power receiving equipment 19. With the above, the construction of the trunk cable is completed, and thereafter, the connection body of the trunk cable unit 1 is used as a building trunk cable.

It is not necessary to use the trunk cable unit 1 of FIG. 1 on the uppermost floor (the eighth floor in the example of FIG. 3), and it is sufficient to use a branch cable 7 with a male connector 5B attached. According to the above construction method, there is no need to install a temporary construction power cable separately from the building trunk cable, so that it is very economical and wiring work is also easy.
In the case of using a vinyl insulated vinyl sheath cable or cross-linked polyethylene insulated vinyl sheath cable as the trunk cable and using a rubber cabtire cable as the branch cable, it is also used as a temporary cable for construction.
There is an advantage that it is easy to use as a building trunk cable after construction.

[Embodiment 2] In this embodiment, a trunk cable unit as shown in FIG. 4 is used. The trunk cable unit 1 has a female connector 5A at one end and a male connector 5B at the other end of a unit length trunk cable 3 having a length of two floors of a building, and a branch cable at both ends of the unit length trunk cable 3. 7A and 7B are connected. The way of connecting the branch cables 7A and 7B is the same as in the first embodiment. As the unit length trunk cable 3 and the branch cables 7A and 7B, the same ones as in the first embodiment are used. Where the branch cable 7A is connected and the female connector 5
A is collectively covered with an insulator. Similarly, the portion where the branch cable 7B is connected and the male connector 5B are collectively covered with an insulator.

Next, a method for constructing a trunk cable for a building using the trunk cable unit 1 will be described with reference to FIGS. First, when the floor and ceiling on the first floor of the building are completed, as shown in FIG. 5, a temporary power receiving facility 9 for construction is installed on the first floor, and a trunk cable 11 of a required length is connected thereto. The female connector 5A and the branch cable 7 are connected to the end of the trunk cable 11 in advance. Next, a temporary switchboard 13 for construction is installed at an appropriate position on the first floor,
The tip of the branch cable 7 is connected there. With this, a power source for operating various tools and construction machines can be secured on the first floor, and necessary work is performed on the first floor.

Next, when the floors and ceilings on the second and third floors are completed, the trunk cable unit 1 shown in FIG. 4 is carried in at this stage, and is inserted into the holes 15 in the floors on the second and third floors. The connector 5B is connected to the female connector 5A on the first floor. The hole 15 is the same as in the first embodiment. Next, a temporary distribution board 13 for construction is installed at an appropriate position on the second and third floors, and the branch cable 7A on the female connector 5A side is connected to the temporary distribution board 13 on the third floor, and the branch cable 7B on the male connector 5B side.
Is connected to the temporary distribution board 13 on the second floor. With this, a power source for operating various tools and construction machines can be secured on the second and third floors, and necessary work is performed on the second and third floors. In this embodiment, the length of the branch cable 7 is as long as possible. For example, as shown in FIG.
Preferably, the length is longer than the length of the floor.

Next, when the floors and ceilings of the fourth and fifth floors are completed, at that stage, the trunk cable unit 1 shown in FIG.
And carry out the same work as the work performed on the 2nd and 3rd floors. In this way, the trunk cable unit 1 is gradually extended to the upper floor by connecting the connector as the building construction progresses, and during the construction work, the connecting body of the trunk cable unit 1 is connected to the temporary power cable for construction. Use as

When the building is completed up to the top floor and the construction using the temporary power supply is completed at each floor, a regular distribution board 17 is installed in the vertical wiring space of each floor as shown in FIG. Regular distribution board 1 separated from the board
Connect to 7. The temporary switchboard will be removed at this stage. On the first floor, the temporary power receiving equipment for construction is removed and the regular power receiving equipment 19 is installed. Therefore, the trunk cable 9 on the first floor is connected to the regular power receiving equipment 19. With the above, the construction of the trunk cable is completed, and thereafter, the connection body of the trunk cable unit 1 is used as a building trunk cable.

According to this method, in addition to the same effects as in the first embodiment, the number of connectors used can be reduced as compared with the first embodiment, and since there is no insulation treatment for only the branch cable connection portion, the trunk line is not used. The effect that the cost of the cable unit 1 can be reduced is obtained.

Third Embodiment In the first and second embodiments, regular distribution boards 17 are installed on all floors, and all branch cables 7 of each trunk cable unit 1 are connected to the regular distribution boards 17. As described above, some buildings do not have a regular distribution board on some floors. In such a case, there will be branch cables that are not connected to the regular distribution board. It is preferable that the branch cable not connected to the regular distribution board is subjected to insulation treatment as shown in FIGS.

That is, first, as shown in FIG. 3A, the branch cables 7A and 7B are cut at, for example, the position indicated by a two-dot chain line while leaving an appropriate length. At this time, the branch cables 7A, 7B
Is set to such a length that terminals and the like can be easily connected to the branch cables 7A and 7B later. Next, as shown in (B), the ends of the branch cables 7A and 7B are covered with an insulating cap 21 and fixed with an adhesive tape or the like. Thereafter, as shown in (C), the heat-shrinkable tube 23 is covered (or tape-wrapped) in a state where the branch cables 7A and 7B are arranged along the unit-length trunk cable 3, so that the cables are sealed. By doing so, the projecting dimensions of the branch cables 7A and 7B are small, and the branch cables 7A and 7B can be reliably protected.

At a later date, when the power demand increases on any floor, the heat shrink tube 23 and the cap 21
Is removed, for example, as shown in FIG.
If terminals 25 are attached to the ends of the terminals A and 7B and a cable of an increasing power demand level is connected thereto, it is possible to easily respond to a new power demand.

[0031]

As described above, according to the present invention, there is no need to lay a temporary power cable for construction.
The temporary power cable itself becomes unnecessary, and the cost can be reduced, and the cost required for storage, maintenance, and inspection when the temporary power cable is reused as in the related art can also be eliminated. Also, the space for laying a temporary power cable for construction is not required, and the space can be effectively used at a complicated construction site. In addition, it is not necessary to make a hole in the floor for laying a temporary power cable for construction and to close the hole after the construction is completed, so that the construction cost can be reduced. Furthermore, since the trunk cable can be extended to the upper floor according to the progress of building construction, it is also possible to equalize the amount of electrical work.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a trunk cable unit according to the present invention.

FIG. 2 is an explanatory view showing one embodiment of a method for constructing a building trunk cable according to the present invention using the trunk cable unit of FIG. 1;

FIG. 3 is an explanatory diagram of a building trunk cable completed by the construction method of FIG. 2;

FIG. 4 is a front view showing another embodiment of the trunk cable unit according to the present invention.

FIG. 5 is an explanatory view showing another embodiment of a method for constructing a building trunk cable according to the present invention using the trunk cable unit of FIG. 4;

FIG. 6 is an explanatory diagram of a building trunk cable completed by the construction method of FIG. 5;

7 (A) to 7 (C) are front views showing an insulation process of a branch cable which is not used for the time being in the construction method of FIG. 5;
(D) is a front view showing the state when the branch cable is used later.

[Explanation of symbols]

 1: Trunk cable unit 3: Unit length trunk cable 5A: Female connector 5B: Male connector 7, 7A, 7B: Branch cable 9: Temporary power receiving equipment for construction 11: Trunk cable 13: Temporary distribution board for construction 17: Regular Distribution board 19: Regular power receiving equipment 21: Insulation cap 23: Heat shrink tube

Continuation of front page (72) Inventor Mitsunori Watanabe 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Inside Furukawa Electric Co., Ltd.

Claims (3)

[Claims] A connector (5A, 5A, 5A, 5A, 5B) is provided at both ends of a unit length trunk cable (3) having a length of one floor or a plurality of floors of a building.
B) is attached, and a trunk cable unit (1) is prepared by connecting the required number of branch cables (7) to the unit length trunk cable (3), and this trunk cable unit (1) is used for building construction. In accordance with the above, the connectors (5A, 5B) are interconnected with each other to gradually extend to the upper floor, and during the construction of the building, the branch cable (7) of the trunk cable unit (1) is temporarily installed on each floor for construction. After connecting to the distribution board (13) and using the connected body of the trunk cable unit (1) as a temporary power cable for construction, after the construction using the temporary power supply is completed, the connection of the trunk cable unit (1) is completed. The branch cable (7) is connected to a regular distribution board (17), and the connection of the trunk cable unit (1) is used as a trunk cable for a building. Construction method Le. 2. After the construction using the temporary power supply is completed, the branch cables (7A, 7B) which are not connected to the regular distribution board are subjected to an insulation treatment (21) at their ends to be used later. The construction method according to claim 1, wherein the method is provided. 3. A connector (5A, 5B) is attached to both ends of a unit length trunk cable (3) having a length of two stories of a building, and a branch cable is attached to both ends of said unit length trunk cable (3). A trunk cable unit for a building, wherein (7) is connected.