JPS60118008A - Concrete direct burying wiring process - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Background and Object of the Invention] The present invention provides an indoor I! Ii! Regarding the line construction method, more specifically regarding the direct buried wiring method in concrete.

Concrete 1 to direct construction methods for indoor wiring are generally carried out by burying conduit directly in concrete and running wires and cables through the conduit. In this method, the conduit and the wires/cables are manufactured separately, and the cumbersome work of threading the conduit cable through the conduit is required, which requires a large amount of man-hours. In addition, the conduit tube is larger than the wire/cable size to allow for smooth wiring and to provide extra wiring space.

In view of the drawbacks of the conventional construction method using electrical conduits mentioned above, the cable itself was coated with an anti-I-4 coating that could withstand the impact when concrete was placed. A construction method has been devised and put into practical use.This construction method reduces the wiring space to the size of the cable and saves labor (no need to bury the cable), but the biggest drawback is that Because the buried cables are integrated with the concrete, rewiring or replacing them in case of damage is difficult.
The work involved difficult work, including peeling off hardened concrete.

The present invention aims to solve the above-mentioned drawbacks of the prior art, and to provide a new type of direct buried wiring method in concrete that achieves rationalization and labor saving of wiring from the initial stage and also allows for subsequent secondary wiring to be carried out advantageously. .

[Summary of the Invention] The gist of the present invention is to construct concrete using a cable designed to have an inclusion between the outer protective sheath and the cable core so that the cable core inside the outer protective sheath can be extracted. The primary wiring is directly buried inside the cable, and as secondary wiring, the cable core and inclusions of the secondary wiring cable are removed and the wires and goople are routed through the remaining external protective sheath. 147 things to do
It is in the direct buried concrete wiring method.

[Example] This will be explained below with reference to the drawings.

Figure 1 shows an example of an indoor wiring situation, and Figure 2 shows the dimensions of the primary wiring cable used for the wiring.

The cable 1 is wired in N stages directly into the ceiling concrete 1 2, and is led into a joint box 3 embedded in the ceiling concrete 2 and connected to the light fixture 4, and is also routed from the ceiling concrete 2 to the wall 5. Pull it down and connect it to the outlets 1 to 7 on the wall board 6. However, cable 1
is a cable core 12 in which an insulator 11 is coated on a conductor 10.
, an external protective sheath 13 provided to surround this cable core 12 , and an inclusion 14 provided between this external protective sheath 13 and the cable core 12 , and the inclusion 14 includes at least the external protective sheath 13 . A lubricant is applied to the outer surface so that the material can be separated from the material, or a material that is easily deformable, such as a rubber-like foam made of 411IX, is used. As a result, even if the external protective sheath 13 is integrated and buried in concrete, the cable core 12 can be extracted together with the inclusion 14.
There is.

Although primary wiring is performed by directly burying the cable 1 in the concrete 1 to 1 as described above, a wiring stand becomes necessary due to subsequent increase in current carrying capacity.

In such secondary wiring, the end of the cable 1 is opened by listening to the joint box 3, and the opposite end of the cable 1 is opened by listening to the outlet 1-box 7 at the opposite terminal. Then, after connecting the cable core 12 and the new wiring 20 etc. at the cable terminal on the outlet box 7 side, the cable core 12 and the inclusions 171 are pulled out all at once or sequentially from the cable terminal of the box 3 to the dicoin 1 and removed. When the cable core 12 and the inclusions 14 are removed, the electric wire 20 becomes hollow and is sequentially drawn into the external adjacent sheath 13 left in the concrete and is used for secondary wiring.

Figure 3 shows the cable 4111 construction for secondary wiring.

- An electric wire 20 which has been pre-warped is housed in an external protective T-sheath 13 that is embedded and integrated into the concrete 1 by means of secondary wiring. In this case the external protective sheath 13
There is a gap 21 between the concrete and the electric wires 20 (i-iJ), but this gap is formed after the concrete 1~ has already been installed, so there is no possibility that the external defense sheath 13 will be crushed. The electric wire 20 can be maintained in a state where the shape is maintained without any cracks.

In the above case, the secondary wiring wire 20 is tied directly to the core of the cable 1 and wired. It is possible to remove the cable core 12 and pass the wire through the external protective sheath, and then use the lead wire A7 to pull the wire/cable into the external protective sheath and avoid passing the wire. be.

J: Ic Even if the connector has a connecting part 8 in the middle as shown in Fig. 1, if the connecting part 8 is made large enough to pass through the external protective sheath 13, it can be handled together with the connecting part 8. I can do it.

[Effects of the Invention] As is clear from the above explanation, according to the direct buried wiring method in concrete 1 of the present invention, when concrete is poured, the external protective sheath is covered with a straight J''1 type cable. -1 ~ Since the primary wiring is directly buried inside the pipe, the troublesome work of running the wire through the pipe is required.-It is possible to save labor, rationalize the wiring work, and reduce the wiring space, while at the same time, it is possible to reduce the wiring space required afterward. The secondary wiring will be done by using the cable that has been previously routed, making the outer protective sheath of the cable hollow, and inserting new wires/cables into the RL and + lines of the concrete. It does not require destruction or extra material man-hours, and the wires and cables can be routed in secondary wiring at the same time as the cable core is removed from the cable, making it easier to route cables through conduits without having to worry about the troublesome strings involved. 1! We offer outstanding wiring methods in terms of both workability and economy.

[Brief explanation of drawings]

Figures 1 to 3 show an embodiment of the direct buried wiring method in concrete according to the present invention, and Figure 11 shows l! l[! An explanatory diagram showing an example of a wire system, Fig. 2 is a cross-sectional explanatory diagram showing a direct buried cable (111 structure) for primary wiring, and Fig. 3 is a cross-sectional explanatory diagram showing a cable structure that is pulled during secondary wiring. Yes. 1: Cable directly buried in concrete, 2: Ceiling concrete, 12: Cable core, 13: External protective sheath, 14:
Inclusions, 20 secondary wiring wires. See 1. Rhinoceros 2. Garden 3.

Claims (1)

[Claims] In order to allow the cable core inside the external protective sheath to be extracted, primary wiring is performed by directly burying it in concrete using a trench cable with an inclusion between the external protective sheath and the cable core. If you remove only the cable core and inclusions of the relevant wiring cable for the purpose of wiring,
By passing electric wires and cables through the external protective sheath left in b.
1 - Direct processing wiring method.