JP4182425B2 - Embedded electric circuit for steel plate concrete structure - Google Patents

Description

The present invention, at least the inside of the concrete structure with a steel plate on one surface, about the buried conductive path formed in the steel concrete structure that is construction by burying an elongated steel as joists material comprising a strength member.

  Large buildings such as buildings, high-rise condominiums, and factory buildings, or structures such as bridges are often constructed with a reinforced concrete structure (RC structure) or a steel frame / reinforced concrete structure (SRC structure). In these structures, an electric circuit composed of a conduit for inserting a cable for electric equipment and communication equipment is laid in the concrete.

  For example, in a multi-story building such as a building or a high-rise apartment, an electric circuit composed of a conduit is embedded in a floor slab, and a cable is often laid in the embedded electric circuit. In the case of a reinforced concrete structure, reinforcing bars are arranged at the upper and lower parts of the floor, respectively, and a conduit is buried in the middle of the reinforcing bars. In this case, a relatively large conduit is placed between the upper and lower reinforcing bars. There is no problem because there is space for laying. On the other hand, a steel plate concrete structure (SC structure) in which H-shaped steel is embedded in concrete as a reinforcing material inside a concrete structure having a steel plate on at least one surface has recently been developed and attracting attention.

  In order to embed the electric circuit in the steel plate concrete structure, as in the case of the reinforced concrete structure, a method of burying the electric conduit in the gap above the H-shaped steel can be considered. FIG. 3 is a longitudinal sectional view showing a case where a conduit tube is embedded in a floor slab formed of a steel plate concrete structure based on the above-described concept (by a conventional method). In this example, the upper surface of the steel plate concrete structure 1 constitutes the upper floor 2 and the lower surface constitutes the lower ceiling 3. Reinforcing bars 4 are arranged vertically and horizontally at the upper part of the steel plate concrete structure 1, and a plurality of steel materials 5 made of H-shaped steel are arranged at predetermined intervals as joists as strength members at the lower part. And the space | interval of the reinforcing bar 4 and the steel material 5 is utilized as a space of the buried electric circuit, and the electric pipe 6 is buried in this portion to form an embedded electric circuit, that is, an embedded electric wiring path through which the cable can be inserted.

  In order to form an embedded electric circuit as shown in FIG. 3, first, a steel member 5 as a joist member is joined to a steel plate and a number of studs 5a are welded and fixed to the already installed wall portion. The conduit 6 is laid on the upper side. Further, a reinforcing bar 4 is set above, and finally concrete 8 is placed. And when the concrete 8 hardens | cures, the steel plate concrete structure 1 with which the electric pipe 6 was embed | buried like FIG. 3 will be completed.

  However, since the steel plate concrete structure 1 has a narrow space between the reinforcing bar 4 and the steel material 5, it is difficult to secure a space for arranging the conduit. Therefore, the formation of the buried electric circuit involves a lot of labor and complexity, and in some cases, the buried construction may be difficult. Further, when a post-casting anchor or the like is driven into the slab made of a steel plate concrete structure from the upper floor, for example, the distance from the floor position to the conduit 6 is short. It may damage the conduit 6 or the cable inserted therethrough.

  Then, this invention makes it a subject to solve the various problems which concern, and it aims at providing the new buried electric circuit for it. Another object of the present invention is to provide a cable burying method using the buried electric circuit. Another object of the present invention is to provide a method for forming the buried electric circuit.

An embedded electric circuit according to the present invention that solves the above problems is an embedded electric circuit formed in a steel plate concrete structure formed by embedding a long steel material as a joist as a strength member inside a concrete structure having a steel plate on at least one surface. In
The steel material is a tubular steel 10 having a rectangular cross section in which an elongated closed space is formed, and each of the plurality of tubular steels 10 comes into contact with the steel plate 7 and a contact portion thereof is fixed by welding.
Each of the tubular steel 10 and the steel plate 7 is formed with a first cable through hole 14 that constitutes a communication portion 12 that opens to the outside of the steel plate,
A branch electric circuit 11a is connected to a plane facing the contact surface of each tubular steel 10 with the steel plate 7 so as to straddle the plurality of tubular steels 10 in contact with the plane.
Burying the steel concrete structure, wherein a second cable through-hole 14 is formed Tei Rukoto at a position opposite to the first cable through-hole 14 between the branch path 11a and the tubular steel 10 It is an electric circuit (Claim 1).

In the above Kiuma設電path, the communication unit may be configured by the connection box connected to the tubular steel (Claim 2).

The buried electric circuit of the steel plate concrete structure according to the present invention uses a rectangular tubular steel that forms an elongated closed space inside, and a plurality of rectangular tubular steels 10 are in contact with the steel plate 7 in one plane. The contact portions are welded and fixed, and each tubular steel 10 and the steel plate 7 are formed with a first cable through hole 14 that constitutes a communicating portion 12 that opens to the outside of the steel plate. Even in the case of a steel plate concrete structure with insufficient space, a buried electric circuit can be easily formed. That is, since the flat surface of the rectangular tubular steel 10 is in contact with the steel plate 7, the buried electric circuit can be arranged close to the steel plate 7.

  In addition, when a post-fixed anchor is driven from an upper floor or the like in a steel concrete structure, the cable is damaged by the anchor tip because the cable is inserted through an electric circuit that is secured at a relatively large distance from the floor or the like. There is no fear. Furthermore, since the buried electric circuit is formed in a closed space of tubular steel that can take a larger cross-sectional space than the conduit, cable laying and renewal work can be facilitated. In addition, a large number of cables can be laid in parallel in one buried electric circuit. Furthermore, since there is no electric conduit in the steel plate concrete structure, it is possible to prevent a decrease in the strength of the steel plate concrete structure and to reduce the construction cost.

Further, a branch electric circuit 11a is connected to a plane opposite to the contact surface of each tubular steel 10 with the steel plate 7, so as to straddle the tubular steel 10, and the first electric wire is interposed between the tubular steel 10 and the branch electric circuit 11a. Since the second cable through hole 14 is formed at a position facing the cable through hole 14, the cable can be laid in two dimensions.
That is, the degree of freedom of the cable laying route can be increased, and cable laying and updating can be performed more easily.
Further, when the communication part is constituted by a connection box connected to the tubular steel, the cable can be laid or renewed more easily, and complicated processing or the like is not required for the tubular steel.

  Next, the best embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of a steel plate concrete structure in which a buried electric circuit according to the present invention is formed, and FIG. 2 is an AA sectional explanatory view of FIG. 1 (concrete portion omitted). In this example, the upper surface of the steel plate concrete structure 1 constituting the floor slab constitutes the floor 2 of the upper floor of the building, and the lower surface constitutes the ceiling 3 of the lower floor, for example.

  Reinforcing bars 4 are set (arranged) as upper end bars in the upper part of the steel plate concrete structure 1, and a plurality of elongated tubular steels 10 having a square cross section are arranged in the lower part as joists constituting strength members. In this embodiment, a part between adjacent tubular steels 10 communicates with a branching electric circuit 11a such as a pipe or a conduit that does not have strength but can be inserted with a cable. However, in some cases, the branch circuit 11a can be omitted.

  The inside of the tubular steel 10 forms an elongated closed space, and the closed space serves as a buried electric path 11 for laying a cable. And the connection part 12 which connects the said underground electric circuit 11 and the exterior of the steel-plate concrete structure 1 is provided in the drawing part and drawing part of a cable, and the connection part of the tubular steel 10 and this and the branch electric circuit 11a in this example. The communication part 12 includes a connection box 13 connected to the tubular steel 10. The connection box 13 communicates with the tubular steel 10 via the steel plate panel 7. In addition, the connection part of the tubular steel 10 and the connection box 13 can be previously formed in a manufacturing factory etc., and can be prefabricated. If the connection portion is prefabricated in this manner, the connection accuracy between the tubular steel 10 and the connection box 13 at the site is improved, and the construction efficiency can be increased.

  As shown in FIG. 1, a cable through hole 14 is formed in a portion of the tubular steel 10 in contact with the connection box 13, and a cable through hole 14 is also formed in a portion of the branch electric circuit 11 a communicating with the tubular steel 10. . An exposed conduit 15 is connected to the outside of the connection box 13. In addition, although the connection box 13 is not connected to the tubular steel 10 in the rightmost position of FIG. 1, the cable through-hole 14 is formed in the tubular steel 10 of this part as a reserve as shown in the figure. Can do.

  In FIG. 1, for example, the cable 16 drawn into the connection box 13 from the left exposed conduit 15 enters the left tubular steel 10 through the cable through hole 14. Then, the buried electrical circuit 11 of the left tubular steel 10 is guided from one end to the other end as shown in FIG. 2, and enters the central tubular steel 10 through the branch electrical circuit 11a communicating with the left tubular steel 10, and from there As shown in FIG. 1, it is pulled out from the central exposed conduit 15 through the lower cable through hole 14. Note that the cable 16 may be inserted through only one tubular steel 10 from one end to the other end and connected to the exposed conduit from both ends. Further, in FIG. 2, the cable 16 may be guided in the middle tubular steel 10 upward in the figure and led into the right tubular steel 10 through the branch electric circuit 11 a.

  In order to form the buried electric circuit 11 as shown in FIG. 1, first, the steel plate panel 7 to which the tubular steel 10 and the stud 5 a are welded and joined is fixed on a wall portion (not shown), and then the desired position on the upper side of the tubular steel 10. The branch circuit 11a is fixed. Next, the steel bar concrete structure 1 in which the embedded electric circuit 11 is formed is completed by setting the reinforcing bar 4 at a predetermined position above the branch electric circuit 11a, and finally placing concrete 8 and embedding them. In addition, it is desirable to insert a messenger wire into a desired route of the buried electric circuit 11 and the branch electric circuit 11a before placing concrete.

  Next, a method of burying the cable 16 as shown in FIG. 2 in the buried electric circuit 11 formed as described above will be described. First, the front end of the cable 16 is connected to the rear end of a messenger wire previously drawn into the embedded electric circuit 11, and then the cable 16 is embedded in a predetermined path of the embedded electric circuit 11 by pulling out the messenger wire. Thus, since the cable 16 is laid along the embedded electric circuit 11 formed in the tubular steel 10 for reinforcement, the above-described effects are exhibited.

  The buried electric circuit or the like of the present invention can be used in the field of laying a cable on a steel plate concrete structure.

The longitudinal cross-sectional view of the steel plate concrete structure which formed the embed | buried electric circuit which concerns on this invention. It is AA sectional explanatory drawing of FIG. 1, and a concrete part is abbreviate | omitted. The longitudinal cross-sectional view of the steel plate concrete structure which formed the embed | buried electric circuit with the conduit tube by the normal method in the steel plate concrete structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Steel plate concrete structure 2 Floor 3 Ceiling 4 Reinforcement 5 Steel 5a Stud 6 Conduit tube 7 Steel plate panel 8 Concrete

DESCRIPTION OF SYMBOLS 10 Tubular steel 11 Embedded electric circuit 11a Branch electric circuit 12 Communication part 13 Connection box 14 Cable through-hole 15 Exposed electric wire pipe 16 Cable

Claims (2)

In an embedded electric circuit formed in a steel plate concrete structure formed by embedding a long and narrow steel material as a joist material to be a strength member inside a concrete structure having a steel plate on at least one surface,
The steel material is a tubular steel 10 having a rectangular cross section in which an elongated closed space is formed, and each of the plurality of tubular steels 10 comes into contact with the steel plate 7 and a contact portion thereof is fixed by welding.
Each of the tubular steel 10 and the steel plate 7 is formed with a first cable through hole 14 that constitutes a communication portion 12 that opens to the outside of the steel plate,
A branch electric circuit 11a is connected to a plane facing the contact surface of each tubular steel 10 with the steel plate 7 so as to straddle the plurality of tubular steels 10 in contact with the plane.
Embedding a steel plate concrete structure in which a second cable through hole 14 is formed between the tubular steel 10 and the branch electric circuit 11a at a position facing the first cable through hole 14. Electric circuit. In claim 1,
The communication part 12 is constituted by a connection box 13 connected to a tubular steel 10, and an embedded electric circuit for a steel plate concrete structure.

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