JPH0788703B2 - Floor structure construction method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for constructing a floor structure having a wiring space in which a power cable, a communication cable and the like can be rewritably arranged.

“Conventional technology” In recent years, in office buildings and other buildings, floor systems have been adopted so that communication cables, power cables, etc. can be freely rewritably wired in response to advanced information technology. It has become to. As such a floor system, for example, wiring ducts are arranged vertically and horizontally inside the RC floor, and a plurality of duct openings are provided on the top surface of the RC floor so that communication cables, etc. can be resized from the openings. There is something.

However, the floor system having such a structure has some improvements such as temporary construction of the support work, which makes the construction complicated and the cost is high.
As one means, it is considered to use a floor construction method of unsupported construction as shown in FIG. 9, for example.

This floor construction method uses a plate-shaped scrap frame 2 that forms the lower surface of the floor 1.
A method of using a reinforced floor slab 5 composed of a reinforced truss 4 arranged in parallel with each other on the upper surface of the scrap frame 2 with a spacer 3 interposed between the beams 6, 6 ...・ Along with arranging the above, the reinforced floor slabs 5,5 ...
The floor 1 is finished by placing concrete 7 on the reinforced floor slabs 5, 5 ...

"Problems to be solved by the invention" By the way, when installing a floor duct on an ordinary RC floor, the floor formwork is assembled at the construction site, and the floor duct is installed after the lower end reinforcing bars of the floor slab have been arranged. After that, the procedure is to complete the floor by arranging the top reinforcing bars and placing concrete. However, in the conventional floor construction method described above, since the upper end reinforcing bars, the lower end reinforcing bars and the reinforcing bar trusses connecting them are three-dimensionally constructed by welding to each other, the conventional floor duct cannot be installed.

The present invention has been made in view of the above circumstances, and has a wiring space in which a power cable, a communication cable, and the like can be rewritably laid, and at the same time, realizes simplification of the construction at low cost. The purpose is to provide a construction method of a floor structure that can be performed.

"Means for Solving the Problems" In the construction method for a floor structure according to the present invention, a plate-shaped mold member that constitutes the lower surface of the floor to be constructed and the upper surface of the mold member are arranged in parallel with each other. Using a reinforcing bar truss having a reinforcing bar truss, a main wiring duct made of a metal tube is preliminarily assembled between the upper and lower reinforcing bars of the reinforcing bar truss in parallel with or intersecting with the reinforcing bar truss, and main wiring is also performed. The branch wiring duct, which is made of a metal pipe that connects the two ducts, is temporarily assembled by crossing the main wiring duct, and then the main wiring duct and the branch wiring duct are joined to each other via a junction box. Then, in this state, the reinforced floor slabs are placed between the beams by placing both ends of the reinforced floor slabs on the receiving beams that are laid between the columns, and the ducts of the reinforced floor slabs are bridged. After connecting the reinforced floor The floor is formed by placing concrete on the upper surface of the plate.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 8.

FIG. 1 is a plan view of a floor 10 having the structure of this embodiment, and FIG. 2 is an elevational sectional view thereof, in which reference numeral 11 is a girder and reference numeral 12 is
Indicates a beam, respectively. As shown in FIGS. 3 and 4, the floor 10 is formed by placing concrete 14 on the upper surface of a reinforced floor slab 13 which is bridged over a large beam 11 and a small beam 12.

Reinforcing bar deck 13 (length 3m, width 2m, height 1 in this embodiment)
About 4.5 cm) is a scrap frame 15 of steel plate that constitutes the bottom surface of the floor 10.
And a plurality of reinforcing bar trusses 17, which are arranged in parallel with each other at a predetermined interval (about 15 cm) via a spacer 16 on the upper surface of the scrap frame 15. Rebar truss
As shown in FIG. 3 and FIG. 4, 17 is composed of an upper muscle 17a, a lower muscle 17b, and a truss muscle 17c connecting them. Reinforcing bar trusses 17 arranged in parallel on the scrap frame 15
They are connected to each other by horizontal stripes 18a and 18b which are parallel to each other in the vertical direction. The horizontal muscles 18a and 18b are the vertical muscles 17a and 17b, respectively.
It is attached to the part that connects with the truss muscle 17c.
Concrete 14 is cast on the upper surface of the reinforced floor slab 13 thus configured to form the floor 10. That is, the method for constructing the floor 10 is known as the unsupported labor-saving floor construction method.

Inside the concrete 14 cast on the reinforced floor slab 13 described above, as shown in FIG. 1 and FIG.
.. The main wiring duct group 19 ... In which a 3-way wiring space is secured in a form intersecting with. This duct group 19 for main wiring is orthogonal to the reinforcing bar truss 17 and
a and three main wiring ducts 20 embedded in an inverted triangular portion surrounded by truss bars 17c, 17c ...
It is composed of (installation interval about 20 cm). The main wiring duct 20 is made of a metal tube.

Further, as shown in FIGS. 1 and 4, inside the concrete 14, branch wiring is located below the main wiring duct group 19 and has a 3-way wiring space orthogonal to the wiring duct group 19 and secured. A duct group 21 ... Is buried. The branch wiring duct group 21 includes three branch wiring ducts 22 arranged in parallel one by one between the reinforcing bar trusses 17, 17 ...
It consists of ... These three branch wiring ducts 22 correspond to the three main wiring ducts 20 one by one. The branch wiring duct 22 ... is made of a metal tube, and a bent tube 22 is provided to secure a height difference in the middle of the duct.
a is provided.

In addition, the main wiring duct group 19 and the branch wiring duct group 21 are located at so-called twist positions where they intersect each other three-dimensionally, and the other two main wiring ducts 20 and 20 and the branch wiring duct 22, which are not joined, 22 are set to heights that do not hit each other. Those main wiring ducts 20
To further explain the installation height of the branch wiring duct 22, the main wiring duct 20 is, as shown in FIG. 3, a triangle surrounded by the upper bar 17a of the reinforcing bar truss 17 and the truss bars 17c, 17c. It is located at a portion and is inserted at a height slightly lower than the superior muscle 17a. As shown in FIG. 4, the branch wiring duct 22 is inserted between the horizontal pipes 18a and 18b at a height slightly higher than the lower bar 17b of the reinforcing bar truss 17.

In order to join the main wiring ducts 20 ... And the branch wiring ducts 22 .. .. are respectively inserted into the rectangular cylindrical junction boxes 24 having the openings 24a on the upper surface. The opening 24a of this junction box 24
A lid 25, which is flush with the top surface of the floor 10, is detachably attached to the floor, and the lid 25 is removed to remove the main wiring duct 20 from the floor 10.
It is possible to freely change the communication cable etc. inserted in the. Further, as shown in FIG. 5, a conduit tube 26 for connecting the cable to a distribution board or a terminal board is joined to the side surface of the junction box 24.

The shape of the junction box 24 may be a cylindrical shape or a polygonal cylindrical shape other than the above-mentioned square cylindrical shape.

Next, a procedure for constructing the floor 10 having the above structure will be described.

First, in a factory or the like, the required number of main wiring ducts 20 ... And branch wiring ducts 22 ...
Temporary assembly is performed using an auxiliary jig as shown in FIGS.

The main wiring duct 20 is inserted in a direction orthogonal to the reinforcing bar truss 17 while being held at a height close to the upper bar 17a between the upper and lower bars 17a, 17b, and the hanger 30 shown in FIG. 6 is used. The upper muscle 17a is fixedly supported. The suspending tool 30 is formed by bending a single steel rod, and has a horizontal portion 30a on which the main wiring duct 20 is placed, and spring portions 30b and 30b that are bent upward from both ends of the horizontal portion 30a. It is composed of hook portions 30c and 30c bent downward from the upper ends of the spring portions 30b and 30b. In order to fix and support the main wiring duct 20 on the upper bar 17a using such a suspending tool 30, first, the horizontal portion 30a of the suspending tool 30 is passed under the main wiring duct 20, and the springs at both ends are held by both hands. Section 30b, 30b
Is bent inwardly against the urging force, and in this state, the upper hooking portions 30c, 30c are hooked on the upper bar 17a, and then both hands are released to return the spring portions 30b, 30b to their original state by the urging force. It is enough to return it, and then the main wiring duct 2 by the biasing force of the spring parts 30b, 30b.
0 is pressed and fixed to the upper muscle 17a.

In addition, the three main wiring ducts 2 forming the main wiring duct group 19 using the duct spacers 31 as shown in FIG.
The distance between 0, 20, and 20 is maintained evenly. The duct spacer 31 is composed of an outer fitting 32 and an inner fitting 33. The outer metal fitting 32 has downward bent portions 32a, 32a at both ends of one plate.
With two adjacent main wiring ducts 20, 20
The outer metal fitting 32 is fitted on the outer side of each other from above to prevent the distance between the two from expanding beyond a predetermined distance. The middle metal fitting 33 is formed by bending a single steel rod, and has spring portions 33a, 33a whose both ends are bent downwardly and divergently. When inserted between the main wiring ducts 20 and 20 in this state, the spring portions 33a and 33a press the main wiring ducts 20 and 20 toward the both-end bent portions 32a and 32a of the outer metal fitting 32 due to the biasing force. , Main wiring duct 2
0 and 20 are sandwiched between the outer metal fitting 32 and the middle metal fitting 33 and are always held at a constant interval. Further, the space between the adjacent main wiring ducts 20, 20 may be kept constant by using the same means as described above.

Branch wiring duct 22 to be joined to main wiring duct 20 ...
Is temporarily assembled in a substantially parallel state between the predetermined reinforcing bar trusses 17, 17 on the upper surface of the reinforcing bar floor slab 13.

Next, in this state, the joint end of the main wiring duct 20 ... and the joint end of the branch wiring duct 22 ... are respectively fixed to the junction box 24 ... by welding or bolt connection. Then, the pre-assembly process on the reinforced floor slab 13 is completed. In addition, junction box 24 of both ducts
The joining to the may be performed in the field.

In this way, the required number of reinforced floor slabs 13 ...
・ When the main wiring duct group 19 ・ ・ ・ and the branch wiring duct group 21 ・ ・ ・ have been assembled in advance, each reinforced floor slab in this state
Transport 13 ... to the site. And the reinforced floor slab 13 ...
Are unloaded one after another and laid one after another on the support beams 11 and 12.

Next, the main wiring ducts 20, 20 of the adjacent reinforced floor slabs 13, 13
Of the main wiring ducts 19 and the ends of the branch wiring ducts 22 and 22 are joined together.
When the installation of the branch wiring duct group 21 ... Is completed, the construction of the floor 10 is completed by placing concrete 14 on the reinforced floor slab 13 ...

According to the floor 10 having the above structure, the following excellent effects are exhibited.

By wiring the cable to the main wiring duct 20 and the branch wiring duct 22, the cable can be freely guided to an arbitrary position in the building, and the lid 25 can be removed to freely rearrange the cable. It is also possible.

By embedding the main wiring duct 20 and the branch wiring duct 22 in the concrete 14, a wiring space is secured within the range of the thickness of the concrete 14, and the ceiling height on the floor 10 can be effectively expanded.

Further, the construction method of the floor 10 has the following excellent effects.

The main wiring duct 20, the branch wiring duct 22, and the junction box 24 can all be manufactured at low cost, and commercially available products can be used, so the material cost of the floor duct system composed of the above various ducts can be reduced. You can

The main wiring duct 20 was previously installed on the reinforced floor slab 13 at the factory.
And the branch wiring duct 22 is preassembled, and at the site, only the reinforced floor slab 13 is laid and the joining of the ducts is performed, so the work after the preassembly process can be simplified, and the floor 10 It is possible to effectively reduce the work man-hours and the construction cost of the entire construction.

By using the auxiliary jigs such as the hanging metal fittings 30 and the duct spacers 31, the main wiring duct 20 can be easily and speedily attached to the reinforcing bar truss 17, which contributes to speeding up the construction.

In the above embodiment, the main wiring duct group 19 and the branch wiring duct group 21 are provided to secure the wiring space of 3 ways, but the main wiring duct 20 and the branch wiring duct 22 are It may be a book or a larger number.

Further, the structure of the reinforcing bar floor slab 13 is not limited to the above-described embodiment, for example, the horizontal reinforcing bars 18a and 18b orthogonal to the respective reinforcing bar trusses 17 are omitted and the reinforcing bar trusses 17 are parallel to the scrap frame 15.
Even if only the structure is provided and fixed, the same effect as in the above embodiment can be obtained.

Further, the duct support shown in FIG. 8 may be used in place of the suspension fitting 30 and the duct spacer 31 shown in FIGS. 6 and 7. That is, this duct support 40 is
Adjacent four horizontal stripes 18a ... A suspension plate 41 having a length dimension that rides on it, and a support plate 42 having a rectangular wave shape that matches the arrangement dimensions of the three ducts 20 and supporting each duct 20 from below. And a screw rod 43 for integrally fixing the suspension plate 41 and the support plate 42 by screw fitting with the respective ducts 20 interposed therebetween.
・ It is composed of and, and its installation is very easy and speedy because it requires only screw fitting.

"Effects of the Invention" As described in detail above, according to the method for constructing a floor structure according to the present invention, a plate-shaped mold member that constitutes the lower surface of the floor to be constructed and an upper surface of the mold member are mutually By using a reinforced floor slab having rebar trusses arranged in parallel, a main wiring duct made of a metal pipe is preliminarily provided between the upper and lower rebars of the rebar truss in parallel or intersecting with the rebar truss. Assembling, the branch wiring duct consisting of a metal pipe that connects the main wiring ducts to each other is temporarily assembled by crossing the main wiring duct, and then the main wiring duct and the branch wiring duct are joined. Reinforcing bars that are joined to each other through the box, and in this state, the reinforced floor slabs are bridged between the beams by placing both ends of the slabs on the beams that are bridged between the columns. The floor ducts After the connection, the floor is formed by placing concrete on the upper surface of the reinforced floor slab, so that the floor duct can be adopted in the floor structure using the reinforced floor slab. In addition, piping work for each duct is easy and safe, and temporary work such as support work can be omitted, thereby shortening the construction period and reducing the construction cost.

[Brief description of drawings]

1 to 7 show an embodiment of the present invention. FIG. 1 is a plan view showing a floor structure, FIG. 2 is a sectional view taken along the line II of FIG. 1, and FIG. Is an enlarged sectional view taken along the line II-II shown in FIG. 1, FIG. 4 is an enlarged sectional view taken along the line III-III shown in FIG. 1, and FIG. 5 shows a state in which each duct is assembled in advance on the reinforced floor slab. FIG. 6 is an external perspective view, FIG. 6 is a usage state diagram of a hanging metal fitting, FIG. 7 is a usage state diagram of a duct spacer, FIG. 8 is a usage state diagram of a duct support tool, and FIG. 9 is a standing floor structure showing a conventional example. FIG. 10 …… Floor, 11,12 …… Large beam, small beam (receiving beam), 14 …… Concrete, 15 …… Scraping formwork (formwork member), 17 …… Reinforced truss, 20 …… Main wiring duct, 22 …… Branch wiring duct,
23 ... junction, 24 ... junction box.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor ▲ Yoshi ▼ Iwatani 714, Uzumasa, Neyagawa-shi, Osaka, Japan, within Saiyo Steel Tube Co., Ltd. Shimizu Construction Co., Ltd. (72) Inventor Yoichi Seki 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Rikuro Suzuki 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Ken Incorporated Co., Ltd. (72) Inventor Wakaoji Takahiro 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu K.K. Company (72) Inventor Shoichi Takahashi 2-16-1, Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (56) Reference JP-A-63-22944 (JP, A)

Claims (1)

[Claims] 1. A reinforced floor slab comprising a plate-shaped form member constituting a lower surface of a floor to be constructed and reinforcing bar trusses arranged in parallel with each other on an upper surface of the form member, Between the upper and lower reinforcing bars of the reinforcing bar truss, a main wiring duct made of a metal pipe is preliminarily assembled in parallel with or intersecting with the reinforcing bar truss, and a branch wiring duct made of a metal pipe for connecting the main wiring ducts is provided. Temporarily assembled by crossing the main wiring duct, and then joining the main wiring duct and the branch wiring duct to each other through a junction box, and in this state, the reinforced floor slab and its both ends are pillars. After placing the beams on the beams that are bridged between them, they are bridged between the beams, and after connecting the ducts of the bridges that have been bridged, concrete is placed on the top surface of the beams. Form a floor by doing Construction method of the floor structure, characterized in that the so that.