JPH05219629A - Method for burying cable directly in concrete of building - Google Patents

Abstract

PURPOSE:To save manufacturing cost of protector or fixing cost by employing a direct burying cable which can withstand against impact of concrete or thermal and chemical degradation due to concrete. CONSTITUTION:A direct burying cable 1 is employed for a indoor electric circuit of 200V where a cable comprising a conductor having nominal cross-sectional area of 0.055cm<2> or less is laid in a concrete structure 9. The direct burying cable is buried directly in the concrete structure 9 without employing any intermediary material. The direct burying cable 1 is constructed to withstand against impact of concrete or thermal and chemical deterioration due to concrete. The direct burying cable 1 is buried in the concrete structure 9 3cm deep or more (except the lead out port of the cable l), binding interval of cable l of about 70cm, and the minimum isolation distance from other piping of about 3cm. According to the method, manufacturing cost of protector, fixing cost, and the like can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for burying a cable or an electric wire used for the purpose of installing electric equipment, electronic equipment, audio equipment, OA equipment, etc. in a concrete structure in a newly constructed or reconstructed building. Regarding

[0002]

2. Description of the Related Art In the prior art, in a newly built or reconstructed building, a cable or an electric wire used for the purpose of installing electrical equipment, electronic equipment, audio equipment, OA equipment or the like constitutes a part of the building. When arranging in the concrete structure, the cable or the electric wire is laid inside a protector for protection such as a metal pipe, a synthetic resin pipe, or a gas iron pipe buried in the concrete structure, and the cable or the The wires are isolated and protected from the concrete.

[0003]

In the prior art, in a newly built or reconstructed building, a cable or electric wire used for the purpose of installing electric equipment or electronic equipment, audio equipment, OA equipment, etc. When arranging in a concrete structure that constitutes a part, the cable or the electric wire is laid inside a protector such as a metal pipe or a synthetic resin pipe or a gas iron pipe buried in the concrete structure, Since the method of isolating the cable or the electric wire from the concrete is used, there is a problem in that manufacturing costs and installation costs of the protective protector are generated, which is an obstacle to cost reduction. The present invention eliminates the need to isolate the direct buried cable from the concrete with the protective protector by using the direct buried cable that withstands impact force, heat and chemical deterioration due to concrete. It is an object of the present invention to provide a method of directly burying the directly buried cable in the concrete structure without interposing the above.

[0004]

[Means and Actions for Solving the Problems] Hereinafter, "building" means "super high-rise building" and "high-rise building" and "middle-rise building" and "low-rise building". Including. In addition, "building to be newly built or rebuilt" is "building"
"In a newly constructed or reconstructed building, before the construction of the entire building is undertaken locally, the building is planned to be divided into several building structures and then manufactured at a production plant, etc. "Concrete structure that forms part of the semi-finished building structure" is "concrete B", and "concrete structure that forms part of a new or reconstructed building, except for concrete B""Is described as" concrete A ".

In order to achieve the above object, the present invention provides:
Power supply: 600 V or less indoor wiring, when the cable or the electric wire is arranged in concrete A or concrete B in an electric circuit that satisfies the condition that the nominal cross-sectional area of the conductor is 0.14 cm ² or less, Alternatively, a direct buried cable is used as the type of the electric wire. The direct-embedded cable is directly embedded in the concrete A or the concrete B. By using the above-mentioned direct-embedded cable, a protector such as a metal pipe, a synthetic resin pipe, or a gas iron pipe is embedded in the concrete A or the concrete B, and the direct-embedded cable is laid inside the protective protector. Therefore, it is not necessary to isolate the direct buried cable from the concrete. The above-mentioned directly buried cable is sufficiently resistant to impact force, heat and chemical deterioration due to concrete.

Before starting the construction of the entire building on site, the building is planned to be divided into several building structures, and the building structures in a semi-finished state are manufactured at a production plant or the like. In such a case, the direct-embedded cable can be embedded in the concrete B at the stage of producing the building structure.

[0007]

[Example] In the following, "a middle-rise building" is referred to as "a building," and "a middle-rise building to be newly built or reconstructed, before the construction of the whole middle-rise building is started on site, the building is planned. Is divided into 20 building structures, and a concrete structure forming a part of the building structure in a semi-finished state manufactured in a production factory is referred to as "concrete C".

In order to achieve the above object, the present invention provides:
Power supply: 200 V, wire conductor nominal cross-sectional area: 0.055 c
When an electric wire is arranged in concrete C in an indoor electric circuit of m ² or less, a direct buried cable is used as the type of the electric wire. The above direct buried cable is the above concrete C
It is buried directly without any inclusions. The above-mentioned directly buried cable is sufficiently resistant to impact force, heat and chemical deterioration due to concrete. In a building, the above-mentioned directly buried cable has a concrete cover: 3 cm or more (excluding the outlet of the directly buried cable), an interval for binding the directly buried cable: about 70 cm, a minimum separation distance from other pipes: 3
It is embedded in the concrete C so as to be about cm.

FIG. 1 shows an example in which the above-mentioned direct-embedded cable is inserted in an embedding box of an embedding type power outlet. FIG. 1 shows that the two-core directly buried cable directly buried in the concrete structure is inserted into a buried power outlet plug box,
FIG. 6 is a cross-sectional view of an embedded power outlet socket box showing a reference example in a state of being connected to a terminal board. In this case, inside the embedded type power outlet embedded box, the direct embedded cable is peeled off gradually except the conductor, and a vinyl tape is wound around the peeled portion to protect the direct embedded cable. ing. In addition, a filling material is inserted in a place where the direct-embedded cable penetrates the embedded power outlet embedded box, and the interior of the embedded power outlet embedded box is isolated from the concrete structure and insulated. ing. The introduction procedure to an electric device, an electronic device, an audio device, an OA device, or the like is the same as in FIG.

Before starting the construction of the whole building on site, the building is planned to be divided into 20 building structures, and the semifinished building structure is manufactured in a production plant or the like. .. The direct-embedded cable is embedded in the concrete C at the stage of a production factory for manufacturing the building structure. The direct-embedded cable embedded in the concrete C constitutes an electric circuit network in addition to a predetermined length suitable for being laid in the building structure including the concrete C according to an electric wiring diagram. If necessary, when the entire building is assembled, it is cut to a length obtained by adding the connection lengths of the electric circuits that span the building structures that are in contact with each other. In this case, at both ends of the direct-embedded cable, the connection length between the building structures that are in contact with each other of the direct-embedded cable is left, and the other is embedded in the concrete C or the It is laid outside the concrete C. Each of the building structures manufactured through the production plant is brought into the field, the building structures are assembled, and the entire building is completed. At the stage of carrying in and assembling each of the building structures to the site and constructing the entire building, the building structure is provided with a connection box for the direct-embedded cable, and wiring is provided between the building structures that are in contact with each other. The direct-embedded cables that are required to be connected to each other are connected in the connection box to form an electric circuit network. The connecting box may be attached at a production factory stage where the building structure is manufactured. In many cases, the connecting box is attached to one side of the building structures which are in contact with each other. In some rare cases, the connecting boxes are attached to both sides of the building structure that are in contact with each other. The direct buried cable embedded in the concrete C may be cut into a predetermined length suitable for being installed in the building structure including the concrete C according to an electric wiring diagram.

[0011]

Since the present invention is configured as described above, it has the following effects. Use as a cable or electric wire that is placed in a concrete structure that constitutes a part of a building, because a direct buried cable that withstands impact force, heat, and chemical deterioration due to concrete is adopted, so that the cable or electric wire is isolated from the concrete As a result, the protector for the metal pipe, the synthetic resin pipe, the gas iron pipe, etc., which is buried in the concrete structure becomes unnecessary, and the manufacturing cost of the protector and the installation cost can be reduced. became.

[Brief description of drawings]

FIG. 1 shows a reference example in which a two-core direct-embedded cable is inserted into an embeddable power outlet embedding box, and the direct-embedded cable is connected to a terminal board. It is sectional drawing of a box.

[Explanation of symbols]

 1 Direct-embedded cable 2 Terminal board 3 Power outlet 41 Insulator wrapped with vinyl tape 42 Conductor wound with vinyl tape 5 Filler 6 Internal wiring 7 Plate 8 Conductor protected by insulator 9 Concrete structure 10 Case

Claims (6)

[Claims] 1. A direct-embedded cable that is sufficiently resistant to impact force, heat, and chemical deterioration due to concrete is used to directly attach the directly-embedded cable to a concrete structure forming a part of a new or reconstructed building. Direct embedding method for concrete in cables in buildings to be buried in. 2. The method for directly burying a cable directly in a building according to claim 1, wherein the directly buried cable is directly buried in a concrete structure forming a part of a new or reconstructed super high-rise building. 3. The method for directly burying a cable directly in a building according to claim 1, wherein the directly buried cable is directly buried in a concrete structure forming a part of a new or reconstructed high-rise building. 4. The method for directly burying a cable directly in a building according to claim 1, wherein the directly buried cable is directly buried in a concrete structure forming a part of a new or reconstructed middle-rise building. 5. The method of directly burying a cable in a building in a concrete structure according to claim 1, wherein the directly buried cable is directly buried in a concrete structure forming a part of a low-rise building to be newly built or rebuilt. 6. Before starting the construction of the entire building locally, the building is planned to be divided into several building structures, and the building structure in a semi-finished state is manufactured at a production plant or the like. The direct-embedded cable is directly embedded in a concrete structure forming a part of the building structure at the stage of manufacturing, according to claim 1 or claim 2, or claim 3, or claim 4 or claim 5. Direct burying method for concrete cables in buildings.