JPH03183843A - Floor structure for access floor - Google Patents

Abstract

PURPOSE:To make construction period shorter by placing a precast concrete board having a number of small supporter columns formed integrally with the upper side of said panel between beams to form a slab and putting a number of floor panels on top of the small columns to be supported thereby. CONSTITUTION:A number of precast concrete boards 11, on which many small columns 15 are formed integrally with said boards, are placed between beams 10 to be supported thereby to form a slab. A bolt 17a provided on the underside of a base plate 17 for floor panel is brought into threaded engagement with an anchor nut 16 embedded in the upper end of each column 15. And then a number of floor panels 18 are placed on the base plates 17 so that an access floor having a space 19 thereunder is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a floor structure constituting an access floor in which a continuous space for wiring and piping is provided under the floorboard.

(Prior art) Conventional access floors are made of concrete slabs, such as cast-in-place concrete floors constructed using conventional floor construction methods, or composite floors in which cast-in-place concrete is poured over a precast concrete slab, as shown in Figure 7. Small columns 2 are erected at regular intervals on the top surface, and square parts of each floor panel 4 constituting the floorboard are placed and fixed on a pedestal 3 attached to the top surface of each small column 2. It is being

The assembly of such a conventional access floor is normally performed in the following steps.

■After cleaning the top surface of the concrete slab 1, mark out the layout lines according to the layout and dimensions of the floor panels.

■Align the center of the small support 2 with the intersection of the layout lines, and fix the base plate 2a at its lower end using adhesive, bolts, etc.

At this time, in the case of a building that requires earthquake resistance, a reinforcing frame 2b is required.

■Insert the plate-shaped panel pedestal 3 into the top of the small column, adjust the level so that the floor panel 4 is at the required height, and then fix it with a set screw.

■Assign the floor panel 4 using the reference line and finishing height as WJ,
Adjust and lay according to the pattern.

(Problem U to be solved by the invention) In the conventional construction method as described above, the access floor can only be assembled after the floor concrete has been poured and cured, and it is difficult to assemble the access floor from pouring the concrete for the horizontal body to marking out the access floor. The problem was that it took a long time, and moreover, it required a lot of work to mark out the markings and erect the small supports, making it impossible to proceed with other work during this time.

Furthermore, in consideration of ffi seismicity, the small columns require reinforcement to prevent them from falling, such as a reinforcing frame or a chin rest, which causes the problem that the space under the floor panel becomes narrower.
In view of these conventional problems, the present invention aims to provide a floor structure for access floors that can form the bottom of an access floor efficiently in a short time with less on-site work, and that can also create a wider space under the floor panel. It is something.

(Means for Achieving the Object) The gist of the present invention in order to solve the above-mentioned conventional problems and achieve the intended purpose is to integrate a large number of small supports with appropriate gaps between them on the top surface. The precast concrete slabs protruding from the wall are lined up across the beams, and each precast concrete slab is integrated to form a slab.
The access floor structure includes a large number of floor panels supported by the upper ends of the small pillars, and a space formed between the slabs and the floor panels.

(Function) In the present invention, since the concrete structure is constituted by a precast concrete slab,
It is possible to assemble the access floor without waiting for the floor concrete to cure on-site, and since the small columns are already integrally protruded from the precast concrete slab, there is no need to erect the small columns or ink them on-site. There is no need for unloading work, and floor panels with spaces can be installed in parallel to the laying of precast concrete slabs.

Furthermore, even when providing ## seismic properties to the small columns, since they are integrated with the concrete slab in advance, sufficient i1 seismic properties can be imparted without using a fall prevention device such as a chin rest.

(Example) Next, an example of the present invention will be described with reference to FIGS. 1 to 6.

1 and 2 schematically show the floor structure for an access floor according to the present invention, and in FIG. 1, reference numeral 10 indicates a steel beam that constitutes a horizontal body. Precast concrete version (hereinafter referred to as PC version) 11.11 between the beams 10.
A large number of stud bolts are lined up and spanned, and one stud bolt
2 and Charcotter concrete 13.14, the spaces between each PC plate 11 and 11 and between each 90 plate 11 and beam 10 are integrated. In the 90th edition 11, there are many small supports 15.15 in the gaps corresponding to the size of the floor panel described later.
...is integrally provided. An anchor nut 16 is embedded in the upper end of each small column 15, and a screw 17a protruding from the lower surface of a floor panel pedestal 17 is screwed into this anchor nut 16. By rotating the screw 17a together with the pedestal 17, Level adjustment is now possible.

In this way, a large number of flow panels 18, 18, etc. are lined up, supported on each pedestal 17, 17, which is supported by each small support 15, 15,... Lay down,
An access floor having a space 19 on the lower surface is formed. When laying this floor panel 18, each corner of the four square floor panels is joined on the pedestal 17 at the upper end of one small support 15.

The small struts 15 may be protruded from the 90-plate 11 by making them both have an integrated reinforced concrete structure as shown in FIG. It is also possible to mold the hole and then fit a separately molded columnar small support 15a into the hole.

In addition to the reinforced concrete or steel frame concrete structure, the 90 version 11 may have a prestressed concrete structure in which PC steel wires are inserted in the longitudinal direction to create tension.

When forming the small support 15 using a formwork, please refer to Figures 5 and 6.
As shown in the figure, a cushion tube 22 made of a flexible material such as styrofoam is fitted into the inner surface of the cylindrical frame 21 for the small support 15 to form a bottom shape, thereby coping with shrinkage during molding of the 90 plate 11. I can do something.

(Effects of the Invention) As described above, in the access floor structure of the present invention, small supports for forming a space under the floor panel are integrally provided on the surface of the 90-plate, and the 90-plate is By constructing a slab by laying concrete, the time required for concrete pouring and curing of the slab is shortened, and the on-site work such as taking out and fixing small supports is reduced. This eliminates the need for floor panels and enables floor panels to be laid in parallel with the laying of the 90-plate, significantly reducing on-site work and shortening the construction period.

Furthermore, since the small support is integrated with the 90 version, the 90 version
Earthquake resistance can be made during the production of the 0 version, and a strong earthquake-resistant structure can be easily obtained without narrowing the space between the small supports.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the floor structure according to the present invention;
Figure 2 is a plan view of the same, Figure 3 is a perspective view of the 90 version with small supports installed, Figure 4 is a sectional view of another example of the small support, and Figure 5 shows the state of the small protrusions when they are integrally molded. FIG. 6 is a cross-sectional view of the same, and FIG. 7 is a cross-sectional view of a conventional example. 10...Beam, 11...Precast concrete plate, 15.
15a... Small support, 16... Anchor nut, 17... Pedestal, 18... Floor panel, 19...
Space, 20... Support fitting hole, 21...
Cylinder form, 22...Cushion tube, 23...
...Mating hole.

Claims (2)

[Claims] (1) Arrange precast concrete slabs with a large number of small pillars protruding from the upper surface at appropriate intervals, spanning between the beams, and integrate the precast concrete slabs to form a slab. A floor structure for an access floor, in which a number of floor panels are supported on the upper end of a slab, and a space is formed between the slab and the floor panel. (2) The floor structure for an access floor according to claim 1, wherein a pedestal for supporting the floor panel is attached to the upper end of each small pillar, and the floor panel is supported on the pedestal.