JPH04111835A - Structural floor member for concrete floor - Google Patents

Abstract

PURPOSE:To obtain a reinforcing frame floor member with a large strength and a structural stability, by flatly fastening a plurality of rows of triangular pyramid truss rods having two upper string rods and one lower string rod by a number of fixing rods bent to form rectangular waves in order to secure the two upper string rods to a base plate. CONSTITUTION:Two upper string rods 2a, 2b and one lower string rod 3 are arranged in an extended condition to form a delta and lattice rods 4a, 4b bent to be triangular waves respectively (rods bent as a sine curve are aplicable) are secured between the upper string rods 2a, 2b and the lower string rod 3. By such a structure, this is constituted to be a triangular pyramid as a whole. For a preferable example of a steel base plate 1, three rows of truss rods T are arranged and the fixing rods 5... to support these truss rods T in a suspended specified position are arranged in a direction perpendicular to the longitudinal direction of the truss rods T to flatly stick, forming a floor member.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a floor member for constructing a reinforced concrete floor slab, and in particular to reinforcing reinforcing bars in architectural slabs.
This is a factory-manufactured product that has both the functions of a spacer and a disposable formwork, and is suitable for simplifying formwork work and reinforcement work, thereby reducing the amount of concrete and shortening the construction time. This paper proposes a new structure for floor members for constructing concrete floors.

[Conventional technology]

When constructing reinforced concrete slabs as mentioned above,
Generally, the following operations are performed in sequence: formwork work, formwork support work, reinforcement work, concrete pouring, and formwork removal work. However, recently, with the aim of simplifying each of the above-mentioned construction works, a simplified construction method has been developed in which pre-fabricated floor members are erected between the structural beams of a building, and then concrete is poured. has been done.

In order to accommodate such simplified construction methods, floor members have recently been proposed that are made of a copper plate for use as a waste formwork and a lattice-shaped reinforcing bar truss integrally formed thereon. For example, Japanese Patent Publication No. 50-14455, Japanese Patent Application Publication No. 59-170347
This is what is proposed in Japanese Utility Model Publication No. 61-65111. Of these, Utsukai Showa 61-
The technique disclosed in Publication No. 65111 is as shown in FIG. , a truss (
The upper reinforcing bars (3a) of 3) are intersected with and welded to the auxiliary bending reinforcing bars (2), and a predetermined interval is provided between the lower reinforcing bars (3b) of the truss (3) and the top surface of the base material (1). truss(
The end of 3) is made to protrude outward from the base material (1), and the lower end of the truss (3) is at the same level as the lower surface of the base material (1) or is a fixing rod (4) that protrudes downward. It is a floor structural material made by vertically fixing the reinforced concrete floor members, and when constructing reinforced concrete floor slabs using such reinforcement formwork floor members, reinforcement work and formwork work are greatly simplified. This has the effect of shortening the construction period.

[Problem to be solved by the invention]

By the way, in the above-mentioned conventional technology, the lattice-like reinforcing bar truss structure must be supported perpendicularly to the floor slab (m-board), and this is due to the bending reinforcing bars arranged in the direction perpendicular to the upper chord bars. This is achieved by welding and fixing.

However, in such a structure, the inferior chord muscle is not fixed particularly in the horizontal direction. Therefore,
When a strong lateral force acts on this reinforcing bar truss,
Verticality of lattice-like reinforcing bar trusses is often lost. Moreover, in the case of truss muscles with such a lattice structure,
If the verticality is lost even to some extent, the lattice will not be able to perform its function, and there is a high possibility that it will be unable to support the load and break, which is dangerous.

In addition, in terms of strength, in a reinforcing bar truss structure like this conventional technology, the upper chord bars receive compressive force while the lower chord bars receive tensile force, so reinforcing bars with a wide variety of diameters are used. This is economically disadvantageous. If the same reinforcing bar is used as the upper and lower chord bars to avoid this, the lower chord bar will be made larger than necessary, which is inefficient.

Further, in this prior art, support bars are always required at both ends due to the shape of the lattice, but since the shape of the support bars is small, it takes time and effort to weld them to the upper and lower chord bars of the lattice. In addition, this lattice must be installed vertically like a reinforcing bar truss, and all the load on this floorboard is concentrated on the support bars, so the height and verticality of the support bars must be determined with high accuracy. The problem was that it was required.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a new floor member that can overcome the above-mentioned problems of the prior art.

For the purpose mentioned above, in particular, to shorten the construction period due to the simplification of each construction work, and to strengthen the upper moving parts that are subject to large stress (compressive force), the reinforcement form floor member is suitable for the following purposes: With this configuration, the upper and lower chord muscles are arranged in a delta shape to
By welding and joining lattice muscles bent into a triangular wave shape to each of the lower chordal motions, and by welding the truss muscles between the two upper reinforcements and the base plate with square wave-shaped fixed reinforcements, the strength is increased. It was found that a reinforcement form floor member with a large and structurally stable structure can be obtained.

That is, the present invention provides a plurality of truss muscles on the surface of a base material, which are configured by three-dimensional reinforcement of upper and lower chord muscles and lattice muscles extending in parallel.
The truss bars are arranged in a plate shape in parallel with each other through fixed bars arranged perpendicularly to each other. The upper chord muscle and the lower chord muscle are arranged in a delta shape, and the upper chord muscle and the lower chord muscle are each connected by a lattice muscle curved in a triangular wave shape. The fixed muscles arranged in rows at predetermined intervals in the longitudinal direction of the truss muscles are bent into an angular wave shape, and the two upper chord muscles of the truss muscles are attached to the upper muscles of the fixed muscles, while the lower part of the fixed muscles is A floor member for constructing a concrete floor, characterized in that reinforcements are fixed on the base material between the truss reinforcements.

[For production]

Normally, in a truss reinforcement structure, if the materials are the same, the upper chord reinforcement that receives compressive force must have a larger cross section than the lower chord reinforcement that receives tensile force. However, in the present invention, since it is composed of two upper chord reinforcements and one lower chord reinforcement, even if the same reinforcing bars are used for the upper and lower chord reinforcements, the spacing of the lower chord reinforcement is higher than the spacing of the upper chord reinforcement. Since the spacing between the bars is wider, reinforcing bars can be used more efficiently.

Further, in the present invention, the shape of the supporting reinforcing bars of the truss support part does not need to be vertical as in the prior art, and the reinforcing bars are easy to arrange.

From this, the feature of the floor member of the present invention is that it has multiple rows of truss bars in a triangular pyramid shape with three points, two upper chord bars and one bottom chord, to ensure that the two upper chord bars and the base plate are connected. It can be said that the structure is made up of a large number of fixing bars bent into a square wave shape in order to fix it to a flat plate.

In addition, in the present invention, the base member is as shown in FIG. 7(a).
Square corrugated cross-section steel plates, flat cross-section steel plates, etc. as shown in ~(d) are preferably used, but square corrugated ones are particularly suitable.
This is advantageous because the amount of concrete can be reduced while ensuring fireproof coverage of the lower chord reinforcement.

Furthermore, in the case where a fireproof coating is required between the lower chord reinforcement and the steel plate, the floor member of the present invention is constructed firmly by welding the reinforcing bars (fixing bars) for fixing the copper plate (saved formwork) to the base plate. Therefore, even when these are superimposed, there is no need to use a spacer. In addition, since the upper and lower chord bars of the lattice material are used as reinforcing bars for the reinforced concrete slab in one direction, only the remaining reinforcing bars in one direction need to be arranged at the construction site.

[Example] Fig. 1 shows a typical example of the floor member of the present invention, and the reference numeral 1 shown in the figure is a base plate preferably made of a steel plate. In the illustrated example, three rows of truss bars T are arranged, and fixed bars 5 for supporting these truss bars T in predetermined positions are oriented perpendicularly to the longitudinal direction of the truss bars T. This is an example of reinforcing and building it into a flat plate and using it as a floor member.

In this embodiment, the truss muscle T is formed by extending two upper chord muscles 2a, 2b and one lower chord muscle 3 in a delta arrangement, and each of the upper chord muscles 2a, 2b
By fixing lattice muscles 4a and 4b bent in a triangular wave (sine curved ones are also applicable) between the lower chord muscle 3 and the lower chord muscle 3, the reinforcement is arranged in a triangular pyramid shape as a whole. ing.

On the other hand, the fixing bars 5 are bent into a square wave shape. The reason why the fixed bars 5 are made into such an angular wave shape is to weld the two upper chord bars 2a and 2b of the truss bar T, and at the same time to weld them to the base plate 1 in order to ensure stable aerial support of the truss bar T. This is to accommodate the need for wider width.

Next, the position of the cross-junction between the truss muscle T and the fixed muscle 5 is as follows in the embodiment shown in FIG. 1, as shown in FIG. 2a,
2b and the peaks of the lattice muscles 4a, 4b.In addition, in the embodiment shown in FIG. 2, as shown in FIG. , 2b and latitus muscle 4a
, 4b, respectively, at a position that coincides with and overlaps the fixed position with the peak part of 4b, or in the vicinity thereof. The former is easy to weld for reinforcement, and the latter has a structure that efficiently transmits the force from the cartilage muscles, so it has a high reinforcement strength.

In addition, the above-mentioned truss muscle T and square wave-shaped fixed muscle 5 are connected by connecting the square wave upper muscle 5a of the fixed muscle 5 to the second chord muscle 2a of the truss muscle 1.
, 2b, and the square wave lower reinforcements 5b are fixed to the base plate 1 so that their sides are in contact with each other.

Although not shown, it is preferable to provide a refractory lining between the bottom chord 3 of the truss reinforcement T and the base plate 1.

Next, Figures 5 and 6 of the drawings show the reinforcement spacing of the truss reinforcements T,
In particular, this shows an example in which the spacing between the lower chord reinforcements 3 is changed.If the spacing is narrowed, the strength per unit area increases, but the amount of reinforcement increases accordingly, which is economically disadvantageous. On the other hand, the upper part of this floor member, that is, the upper chord 2
The part that requires high strength where a and 2b are located is 2
The book's first chord 2a.

2b are arranged, and the number of reinforcements is relatively larger than that of the lower chord reinforcements 3, so that a uniform and solid floor member can be constructed as a whole.

〔Effect of the invention〕

As explained above, in the present invention, since the truss reinforcement has two ascending chord reinforcements, the upper surface of the floor member can better cope with the increasing stress distribution, and as a result, the overall reinforcement balance is wasted. It can be done efficiently without any problems.

In addition, regarding the placement of fixed muscles, in the case of the present invention, the joining position with the truss muscle is in relation to the lattice muscle flexion cycle.
Since the floor member is in a positional relationship that avoids buckling of the two upper chord bars when a construction load (compressive force) is applied to the floor member, it is effective in preventing buckling of the truss bars.

Therefore, according to the floor member of the present invention, nodding is easy and stacking is possible, and when constructing a reinforced concrete floor slab, only minimal reinforcement work (in one direction) is required on site. This simplifies on-site work, shortens the construction period, and greatly contributes to reducing the total cost of construction work.

[Brief explanation of the drawing]

FIGS. 1 and 2 are perspective views showing different embodiments of the floor member of the present invention, and FIGS. 3 and 4 are parts of the truss muscle that clarify the joint positional relationship between the truss muscle and the fixed muscle, respectively. Front view, Figures 5 and 6 are explanatory diagrams showing the relationship between the positional intervals of the superior and inferior chord muscles of the truss muscle, respectively, and Figures 7 (a) to (d)
FIG. 8 is a cross-sectional route diagram showing various aspects of the base plate, and FIG. 8 is a front view of a conventional floor member.

Claims (1)

[Scope of Claims] 1. On the surface of the base material, a plurality of truss muscles are constructed by three-dimensional reinforcement of upper and lower chord muscles and lattice muscles extending in parallel, and the truss muscles are perpendicular to the truss muscles. In a floor member constructed of plate-like structures arranged in parallel via fixed reinforcements, the truss reinforcements are arranged in rows at predetermined intervals on the base material, and two upper chord reinforcements and one The lower chord muscles are arranged in a delta shape, and each upper chord muscle and lower chord muscle are connected by a lattice muscle curved in a triangular wave shape to form a triangular pyramid-shaped set of muscles, and the longitudinal direction of the truss muscle is The fixed muscles arranged in rows at predetermined intervals are bent into a square wave shape, and the two upper chord muscles of the truss muscle are attached to the upper muscles of the fixed muscles, while the lower muscles are attached to each other of the truss muscles. A floor member for constructing a concrete floor, characterized in that it is fixed on the above-mentioned base material between.