JPH0468421B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a truss material for assembling reinforcing bars for floor slabs.

In conventional construction work, when building concrete slabs, it is common to place and assemble reinforcing bars, which will become structural steel bars, on the slab formwork.
In recent years, various construction methods have been proposed in which reinforcing bars are formed in advance as an assembly in order to save labor and shorten the construction period. However, since all of these construction methods use reinforcing bars, which are structural steel bars, as the main material,
The drawbacks were that it was not only heavy, but also complicated to assemble and expensive.

This invention eliminates the conventional drawbacks as mentioned above,
When assembling reinforcing bars, it is possible to reduce the amount of reinforcing bars used, saving material costs.
Moreover, it is an object of the present invention to provide a truss material for assembling floor slab reinforcing bars that can be easily assembled and improves workability.

In other words, the present invention provides a plurality of flat upper chord members arranged symmetrically with respect to the lower chord member at predetermined intervals on both sides of the lower chord member in the longitudinal direction of the lower chord member. The truss member is characterized in that the upper chord member and the lower chord member are connected by a belly member.

The embodiments shown in the drawings will be described below.

1 and 2 show a truss member 1 according to the present invention, and the truss member 1 is formed as follows.
That is, as shown in FIG. 3, notches 3a of a predetermined width are formed at intervals on both longitudinal edges 2a of the steel strip 1a, and a total of six slits 4a are intermittently formed along the longitudinal direction. The steel strip 1a is stretched in a direction perpendicular to the slit 4a, and the elongated flat plate portion 5a, which will become the lower chord member 5, is bent obliquely upward along the chain line 6, and a large number of holes are formed by the cutout portion 3a. A dashed line 7 indicates both side edges 2a of the upper chord 2 separated into
Fold horizontally along. In this way, a large number of upper chord members 2 are provided with a predetermined gap 3 on both sides of the lower chord member 5 along the longitudinal direction, and each upper chord member 2 is provided with a predetermined gap 3.
A truss member 1 is formed in which the bottom chord member 5 and the lower chord member 5 are connected to each other by a belly member 4. 8 is a bolt hole, and 9 is a welding hole.

Figures 4 and 5 show a truss member 1' used at the end of the deck, and this truss member 1' is provided with a predetermined gap 3 only on one outside upper side along the longitudinal direction of the lower chord member 5. A large number of upper chord members 2 are formed, and each upper chord member 2 and lower chord member 5 are connected by a middle member. This truss material 1' is also obtained by processing and forming a steel band in the same manner as described above.

Next, a reinforcing bar assembly using the truss members 1 and 1' as described above will be explained based on the assembly order.

As shown in FIG. 6, lower main reinforcements 10 are fixed to both sides of the lower chord member 5 of the truss member 1 and to one side of the lower chord member 5 of the end truss member 1'. The truss members 1' are arranged so that adjacent lower chord members 5 are parallel to each other, and adjacent upper chord members 2 are overlapped and fixed.

As shown in FIG.
is fixed, and a nut 13 is built into this mounting hardware 12. The lower chord members 5 of the truss members 1 and 1' connected as described above are attached to the mounting hardware 1.
2 and place it so that it rests on top of the bolt hole 8 of the lower chord member 5.
Then, the bolt 14 is inserted and screwed onto the nut 13, thereby fixing the truss members 1, 1' to the formwork 11. The upper distribution reinforcement 15 and the lower distribution reinforcement 16 are integrally formed to form a loop reinforcement 17. A large number of such loop reinforcement 17 are arranged in parallel, and on top of the upper distribution reinforcement 15, a line orthogonal to the loop reinforcement 17 is formed. The upper main reinforcing bars 18 are fixed in such a manner.

Then, as shown in FIGS. 8, 9, and 10, the loop reinforcement 17 to which the upper main reinforcement 18 is fixed is dropped onto the lower main reinforcement 10 through the gap 3 between the upper chord members 5, and the lower main reinforcement 16 is attached to the lower main reinforcement 10. In addition to fixing the
The upper main reinforcement 18 is fixed on the joined upper chord member 5,
A reinforcing bar assembly for a floor slab is formed in the above manner. If necessary, upper and lower main reinforcements 18 and 10 may be further fixed to the upper and lower distribution reinforcements 15 and 16, respectively.

Please note that the above assembly order is only an example.
The order can be changed as appropriate. Further, the reinforcing bars can be fixed to each other by welding or the like.

In the above-mentioned reinforcing bar assembly, concrete is placed on the formwork 11 and a reinforced concrete slab is constructed. Distribution muscle 1
5 and 16 are integrated, and the truss members 1 and 1'
Since it functions as a structural material, the amount of reinforcing bars can be reduced, and the overall weight can be reduced. Furthermore, the truss members 1 and 1' function as spacers that maintain the spacing between the respective reinforcing bars, so that the reinforcing bars are not disturbed by stepping down, and a highly accurate reinforced concrete slab can be constructed. Furthermore, since a gap 3 is formed between the upper chord members 2 of the truss members 1 and 1', when placing the upper and lower distribution bars 15 and 16, simply drop them from above through the gap 3. Therefore, the overall assembly work can be easily performed, and the area of the work place can also be small.

The floor slab reinforcing bars assembled using this truss material for floor slab reinforcing bars constitute a three-dimensional truss, and its mechanical strength is sufficient to support the load when concrete is placed, including the formwork, so it is not necessary. Shoring formwork construction can be adopted. It has also been confirmed through experiments that as the strength of concrete increases, the toughness increases significantly compared to conventional reinforced concrete slabs.

This invention is as described above, and has a plurality of flat upper chords arranged symmetrically with respect to the lower chord member on both sides obliquely upward along the longitudinal direction of the lower chord member, which is in the shape of an elongated flat plate. The upper chord members are formed horizontally at predetermined intervals, each upper chord member and lower chord member are connected by a belly member, and the lower main reinforcement is fixed to both sides of the lower chord member along its longitudinal direction. The force reinforcement and the lower distribution reinforcement are in a loop shape, and the upper main reinforcement is fixed orthogonally to the upper part of the loop reinforcement. The upper and lower main reinforcements are integrated by the upper chord members, lower chord members, belly members, and loop reinforcements to form a three-dimensional truss as a whole, and the load during concrete pouring including the formwork is Since it has the mechanical strength to sufficiently support the steel, it is possible to use unsupported formwork construction, and in this way, the amount of reinforcing bars used can be reduced when assembling the material. It is possible to save costs, and since it can be assembled by simply dropping the loop reinforcement into the space between the upper chord members, the assembly work is easy and has good workability, and the work space is small. It also has the effect of making you feel better.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing one embodiment of the truss material of the present invention, Fig. 2 is a sectional view taken along the line -, Fig. 3 is a plan view showing a method of forming the same, The figure is a plan view showing the truss material used at the end, FIG. 5 is a sectional view taken along the line -, and FIGS. 6 to 8 are longitudinal sectional views showing an example of the assembly order of the reinforcing bar assembly. FIG. 9 is a plan view showing the reinforcing bar assembly, and FIG. 10 is a cross-sectional view taken along line XX of the same. 1...Truss material, 2...Top chord material, 4...Body material,
5...Lower chord material, 10...Lower main reinforcement, 11...Formwork, 15...Upper distribution reinforcement, 16...Lower distribution reinforcement,
18... Upper main reinforcement.

Claims (1)

[Claims] 1. A number of flat upper chord members are placed horizontally at predetermined intervals on both sides of the lower chord member, which is an elongated flat plate, diagonally upward along the longitudinal direction, so as to be symmetrical with respect to the lower chord member. The upper and lower chord members are connected by a belly member, and the lower main reinforcement is fixed to both sides of the lower chord member along its longitudinal direction, and the upper and lower distribution reinforcements form a loop. A loop reinforcement, on which the upper main reinforcement is fixed perpendicularly to the upper part of the loop reinforcement, is dropped into the interval of the upper chord member, thereby fixing the lower main reinforcement and the lower distribution reinforcement. Truss material for assembling floor slab reinforcement.