JPH0349127Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention relates to the floor assembly structure of deck slabs, which are often used to form the road surface of elevated bridges, etc. The present invention relates to a floor structure in which a framework of a three-dimensional truss structure is provided.

``Prior Art'' Conventionally, as a floor slab structure formed by pouring concrete onto a bottom formwork, there is a structure shown in FIG. 7, for example. This has a structure in which a plurality of steel molds 2 are installed in parallel on a bottom formwork 1, and main reinforcing bars 3 and distribution reinforcing bars 4 are also assembled.The steel molds 2 reinforce the concrete 5 and the bottom formwork. At the same time, the concrete 5 and the bottom formwork 1 are more integrated.

However, in a deck slab with such a structure, the concrete is partitioned by the shaped steel 2, which tends to cause cracks, and the rigidity of the shaped steel 2 makes it difficult to attach it to the girder. There is.

As a means to solve these problems, the present applicant previously filed Utility Model Application No. 58-99619 and Utility Model Application No. 60-8707.
No. ``Synthetic Floor Slab'', Utility Application No. 118068, Utility Application No. 118068, Utility Application No. 118068.
No. 27121 "Floor slab" was proposed and a temporary solution was achieved. FIG. 8 shows the technique disclosed for the above-mentioned synthetic floor slab, in which a chevron plate 7 made by continuously bending flat steel into a chevron shape is placed on the bottom formwork 6 in the width direction of the bottom formwork 6. Alternatively, bolts 8 are fastened parallel to one side of the longitudinal direction at a constant interval, and dowel plates 9 are provided protruding from the valleys of these chevron plates 7, and dowel plates 9 are provided on the upper surface of the peaks (tops) of the chevron plates 7. Rebar 10
and distribution reinforcing bars 11 are joined in a mesh shape.

``Problem that the invention seeks to solve'' However, in the case of a floor structure that includes the chevron plate 7, which is a structure in which flat steel is continuously bent into a chevron shape, it is difficult to create a partition wall in concrete like a shaped steel. Although it has the advantage of improving the durability of the deck slab without creating a Since the portions between the valleys and the peaks are wide and flat, there is a problem that the truss points are far apart and the truss action is not sufficient. Moreover, since the chevron plate 7 is constructed by continuously bending a flat steel into a chevron shape, it is difficult to process and the cost tends to be high.

``Means for Solving the Problems'' Therefore, the present invention is based on a bottom formwork that also serves as a strength member, in which a framework of a three-dimensional truss structure extends in the width direction or longitudinal direction of the bottom formwork and is spaced apart in the other direction. The frame is composed of a main reinforcing bar and a plurality of lattice members that hold the main reinforcing bar in a floating state from the bottom formwork, and the lattice is made by bending a round bar into a chevron shape, and the lattice material is welded to both sides of the main reinforcing bar at a predetermined angle of inclination with respect to the main reinforcing bar, with the tops of the chevrons facing each other, In addition, the two ends are welded onto the bottom mold with their ends abutted against each other.

"Function" In the floor assembly structure with the above configuration, the frame has a frame structure like a three-dimensional truss beam, and therefore loads such as shear force applied to the main reinforcing bars are distributed among the adjacent lattice members. In addition, since each lattice material is made by bending a round bar, the lattice points of the truss are made to match, compared to conventional chevron plates made by bending flat steel in a zigzag pattern. The truss effect can be improved.

``Embodiment'' Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 5. In these figures, reference numeral 20 denotes a bottom formwork that also serves as a strength member, and this bottom formwork 20 is formed of, for example, a weather-resistant steel plate, and tapered haunch portions 20a are formed on both side edges of the bottom form 20 in the width direction, that is, in the direction in which it spans over the main girder 21.

Frames 22 of a three-dimensional truss structure extending in the width direction of the bottom formwork 20 are arranged in parallel and at intervals along the length direction of the bottom formwork 20. This frame 22 is composed of a main reinforcing bar 23 and a plurality of lattice members 24 that hold the main reinforcing bar 23 floating above the bottom formwork 20. In the illustrated example, the lattice members 24 are arranged on both sides of the main girder 21 It is provided across the two bottom forms 20.

The lattice material 24 is formed by bending a round bar into a chevron shape, and as shown in FIG. The lattice materials 24 are welded with their peaks facing each other, and the lattice materials 24 have a zigzag shape when viewed from the side (as viewed from the front in FIG. 3) with both ends 24a of the lattice materials 24 butted against each other. Arrange the bottom formwork 20
It is welded on top. In addition, these lattice materials 24
Both ends 24a extend along the longitudinal direction of the main reinforcing bar 23, thereby making it easy to attach the lattice material 24 to the bottom formwork 20.

Further, a plurality of distribution reinforcing bars 25 extending in the direction of the main girder 21 are attached between the frames 22, and a plurality of main reinforcing bars 26 extending parallel to the main reinforcing bars 23 of the frame 22 are installed above these distribution reinforcing bars 25. It is welded.

Note that a support member 30 on which the lattice material 24 of the frame 22 is placed is installed between the bottom forms 20 installed on both sides of the main girder 21. This support member 30 is fitted between the haunches 20a of the bottom formwork 20, and a mounting plate 31 on which both ends of the lattice material 24 are mounted.
and a supporting member 33 which extends perpendicularly to the mounting plate 31 and has holding plates 32 at both ends thereof.The mounting plate 31 is fitted between the haunches 20a and the The plate 31 is supported on the main girder 21 with angle members 34, and the support member 33 is attached to the bottom formwork 20.
The framework 22 can be easily spanned between the bottom forms 20 by a simple fixing operation.

FIG. 5 shows the frame 2 disposed on the bottom formwork 20.
The figure shows the details of the connecting parts between the two, in which the bottom formwork 20 is connected by a backing metal fitting 40, and the frame 22 is connected by supporting reinforcing bars 41 that are wrapped and tied to the main reinforcing bars 23. Concatenated.

Bottom formwork 20 and framework 21 explained above
The floor assembly structure according to the present invention is constructed by the above.

Note that the reference numeral 45 in the figure indicates a seal rubber pasted on the main girder 21.

Next, the operation of the floor assembly structure having the above configuration will be explained.

First, the frame 22 is constructed such that the lattice materials 24 are welded to the main reinforcing bars 23 with their tops facing each other, and the lattice materials 24 are welded to the main reinforcing bars 23 with their respective ends 24a abutting each other and in a predetermined position relative to the main reinforcing bars 23. It is welded at an angle of inclination and has a frame structure similar to a three-dimensional truss beam. Therefore, loads such as shear force applied to the main reinforcing bars 23 are transferred to each adjacent lattice material 24.
They can be distributed and assigned to each other. As a result, the frame 22 can effectively disperse the load related to the main reinforcing bars 23 and the like, thereby achieving high rigidity while reducing weight. Moreover, in the structure of the embodiment, each lattice material 24 is formed by bending a round bar, so compared to a conventional chevron plate made by bending flat steel in a zigzag manner, the lattice points of the truss are made to match. This can improve the truss effect.

Distribution reinforcing bars 25, main reinforcing bars 26, etc. are incorporated into the framework 22 made of the main reinforcing bars 23 and lattice material 24, forming a three-dimensional structure framework on the bottom formwork 20, and each reinforcing bar mutually serves as a strength member. In addition, since it supports the adjacent reinforcing bars as a shoring, it is possible to handle the weight of each reinforcing bar and the weight of concrete during concrete placement without using shoring, eliminating the need for shoring work on site. The construction period can be significantly shortened.

Moreover, in the above-mentioned embodiment, since the lattice material 24 is formed of a round bar, it is easy to process, and its rigidity is smaller than that of flat steel, etc.
can facilitate attachment to the bottom formwork 20;
Applicability to prefabrication can be improved. In addition, the mutual reinforcing bars between the frame 22, each distribution reinforcing bar, and the main reinforcing bar are formed into a three-dimensional structure that is integrated as a whole, and the bond between the poured concrete and the reinforcing bars is more even and strong throughout. Moreover, since no partition wall is formed inside the concrete C, cracking and peeling of the concrete can also be prevented.

Further, FIG. 6 shows another embodiment of the present invention, in which the lattice materials 24 of adjacent frames 22 on the bottom formwork 20 are arranged so as to be shifted by half a pitch. .

In addition, in this embodiment, the shear force applied to the floor slab is applied in a shifted manner, and the both ends 24 of the lattice material 24 are
Since a is inserted between the ridges, it is easy to weld it, and by shifting the truss points, it is difficult for cracks to form, further improving the durability of the deck. can.

In each of the above embodiments, the framework 22, main reinforcing bars 26, and distribution reinforcing bars 25 are integrated on site. Alternatively, the work may be carried out by transporting the workpiece to another location, and if such a method is adopted, the work efficiency will be further improved.

"Effects of the Invention" As explained above, the present invention provides the following excellent effects.

(a) Since the lattice material that makes up the framework of the three-dimensional truss structure is made by bending round bars, the lattice points of the truss are made to match, compared to conventional flat steel plates bent in a zigzag pattern. It can be considered as a state,
The truss effect can be improved.

(b) As a result of the above, the frame can effectively disperse the load related to the main reinforcing bars, etc., thereby preventing cracking and peeling of the concrete and improving the durability of the slab.

(c) Processing of the frame is easy and costs can be reduced.

[Brief explanation of the drawing]

Figures 1 to 5 show an embodiment of the present invention, with Figure 1 being a perspective view showing a partially cut away floor slab, and Figure 2 showing the structure of the floor slab. A plan view, FIG. 3 is a sectional view taken along the line of FIG. 2,
Figure 4 is a cross-sectional view taken along the line of Figure 2 and Figure 5.
The figure is a front view showing details of the connecting parts of the frame,
The figure is a plan view showing another embodiment of the present invention, and FIGS. 7 and 8 are cross-sectional views showing the structure of a conventional floor slab. 20... Bottom formwork, 21... Main girder, 22... Frame, 23... Main reinforcing bar, 24... Lattice material, 25
...Distribution reinforcing bar, 26... Main reinforcing bar, 30... Supporting member, 31... Placement plate, 32... Holding plate, 33...
Support material.

Claims (1)

[Scope of utility model registration request] The floor structure is a floor slab structure in which the framework of the three-dimensional truss structure extends in the width direction or longitudinal direction of the bottom formwork and is arranged at intervals in the other direction on the bottom formwork that also serves as a strength member. The frame is composed of a main reinforcing bar and a plurality of lattice members that hold the main reinforcing bar in a floating state from the bottom formwork, and the lattice member is formed by bending a round bar into a chevron shape, and ,
The lattice material is welded to both sides of the main reinforcing bar at a predetermined angle of inclination with respect to the main reinforcing bar, with the tops of the chevrons facing each other, and placed on the bottom formwork with both ends butted against each other. A floor slab structure characterized by being welded.