JPH11324203A - Floor structural material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce exclusive equipment required for manufacturing floor reinforcing bars to enable manufacture of a large-sized deck at a low cost, in a floor structural material constituted by mounting the floor reinforcing bars on the upper surface of a deck plate. SOLUTION: Floor reinforcing bars mounted on deck plate 1 are constituted of an end fixed material 12, an upper chord bar 13, lower chort bars 14 and joint bearing bars 15 for bearing the upper chord bar and lower chord bars in a joint state. The joint bearing bars 15 are formed by bending one reinforcing bar with a specific length, and they are equipped with the upper chord bar 13 bent in the shape of a ring and holding sections 17 and 18 of the lower chord bars 14, linear diagonal members 19 connecting between both holding sections of the upper chord bar and lower chord bars and legs 20 vertically hung from the holding sections of the lower chord bars, and the diagonal members are provided in the directions of axes of the upper chord bar and lower chord bars so that they form a lattice as a whole.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of producing a plant in a state where a floor reinforcing bar is attached to a deck plate, carrying the same to a construction site and installing the same. The present invention relates to a floor structural material to be cast to form a floor slab of a building.

[0002]

2. Description of the Related Art As this kind of floor structural material, there is, for example, a structure disclosed in Japanese Utility Model Publication No. 2-29137.

As shown in FIG. 1, for example, these floor structural members 1 have a deck plate 2 on which reinforcing ribs are formed along a longitudinal direction, and a reinforcing rib perpendicular to the upper surface of the deck plate 2. Support bar 3 arranged along the lateral direction
And end fixing members 4, 4 respectively arranged at both ends in the longitudinal direction of the deck plate 2, and upper and lower parallel chords 5 and lower chords connected vertically between the end fixing members 4, 4. 6 and a vertical lattice 7 connecting between the upper chord 5 and the lower chord 6.

[0004] The reinforcing lattice lattice beam formed by the upper and lower chord bars 5 and 6 and the support bar 3 has a vertical lattice bar 7 which is meandering between the upper and lower chord bars 6 and which is bent vertically. The bars 5 and the lower chords 6 are fixed to each other by spot welding, thereby increasing rigidity against a downward load.

The support bar 3 is formed in a continuous mountain shape, and the flat bottom side is fixed to the upper surface of the deck plate 2 by welding or the like, and the top of the mountain is straddled by a reinforcing steel lattice beam, and the top of the mountain is connected to the top. It is fixed to the upper chord bar 4 by spot welding, whereby the support bar 3 supports the rebar lattice beam in a suspended state, and cooperates with the end fixing members 4 to prevent the rebar lattice beam from falling. It also functions as a spacer for maintaining a constant distance in the height direction from the upper surface of the deck plate 2 to the lower chord 6.

[0006] The floor structural material 1 is produced in a factory with a floor reinforcing bar including a reinforcing lattice beam attached to a deck plate 2, carried into a construction site and installed, and if necessary, a metal lath for crack prevention is provided. After attaching the floor slab, concrete is cast using the deck plate with the floor reinforcement as a discarding formwork to form a floor slab of the building.

In this type of floor structural material, the length of the deck plate 2 on which the support bars 3 extend is set to a fixed length, and the longitudinal direction of the deck plate 2 on which the vertical lattice bars 7 extend is the floor of the building. An arbitrary length suitable for the structure is set, and the height of the floor rebar is set to an arbitrary length compatible with the thickness of the floor slab. Used side by side in the short direction.

[0008]

As described above, in the case of the conventional floor structural material 1 in which the vertical lattice bars 7 are used as the floor reinforcing bars and the reinforcing lattice beams are used, there are the following points to be improved. Was.

That is, the arcuate surfaces of the upper and lower chord bars 5 and 6 having a circular cross section and the arcuate surfaces of the bent portions of the vertical lattice bars 7 having a circular cross section are welded in a state of abutting on a point contact state. Therefore, when welding, it is necessary to accurately position the two and fix and hold them so as not to cause displacement, and it is necessary to ensure the manufacturing accuracy of the vertical lattice streak.
Welding of the upper and lower chord bars 5 and 6 with the vertical lattice bars 7 and the production of the vertical lattice bars 7 are performed using dedicated equipment.

However, even when manufacturing floor structural materials having the same configuration, a general deck having a slab thickness of about 15 cm,
With a large deck with a slab thickness of more than 23 cm, the above-mentioned dedicated equipment cannot be shared because the size difference is too large. Therefore, special equipment for large decks is required separately, but these large decks are special ones used in basements and bridges, etc. Since the size of each part of the deck is large and the use of a large-diameter reinforcing bar increases the cost of introducing the equipment, the cost is extremely high.

Further, in a large deck, the variation width of the slab thickness is large, and it is advantageous in terms of cost to change the diameter of the reinforcing bar used for the vertical lattice 7 and the pitch of the lattice in accordance with the slab thickness. When manufacturing is performed with dedicated equipment,
Since there is a difficulty in easily coping with the increase or decrease in the dimensions, it is difficult to perform an optimal design according to the slab thickness.

SUMMARY OF THE INVENTION In order to solve the problems of the prior art, an object of the present invention is to provide a floor structural material capable of manufacturing a large deck at low cost by simplifying a dedicated facility required for manufacturing a floor reinforcing bar.

[0013]

In order to achieve this object, a floor structural material of the present invention comprises a deck plate and a floor reinforcing bar mounted on an upper surface of the deck plate.
The floor reinforcing bar includes end fixing members juxtaposed at both ends in the longitudinal direction of the deck plate, upper and lower parallel chords extending between the end fixing members, and upper and lower chords. And a connecting support bar for supporting the connecting bar in a connected state, wherein the connecting supporting bar is formed by bending a single reinforcing bar having a predetermined length, and the upper and lower chords bent in a ring shape. Each holding portion of the streaks, a straight diagonal portion connecting the two holding portions, and a leg portion hanging down from the lower chord holding portion, so that the diagonal portion forms a lattice as a whole. The plurality of upper and lower chords were provided in the axial direction.

The floor structural member having the above-described configuration is provided with a connecting support bar in place of the lattice 7 and the supporting bar 3 in the floor structural member 1 having the conventional configuration, and the connecting supporting bar is a conventional lattice bar. 7 has a function of increasing the rigidity by connecting between the upper and lower chords, and a spacer function of holding the upper and lower chords of the conventional support 3 at a predetermined height on the deck plate. ing. In this connection support bar, only the joints with the deck plate need be welded, and the number of welds is greatly reduced as compared with the related art.
And the welding of this connection support bar and deck plate,
Spot welding is sufficient, and even as a special equipment for maintaining the quality, compared with the conventional special equipment required for welding that was conventionally required, that is, the welding required between the upper and lower chords and the lattice streak. The structure is simple and inexpensive.

In addition, since the above-mentioned connecting supporting bars are configured to hold the upper and lower chords by the ring-shaped holding portion, it is necessary for the conventional lattice bars to be welded to the upper and lower chords. There is no need for high dimensional accuracy in the height direction and in the short direction of the deck plate, and since the distance between adjacent members can be adjusted as appropriate, little dimensional accuracy in the longitudinal direction of the deck plate is required. For this reason, it can be easily manufactured with a general-purpose spring manufacturing machine or a multi-bending machine or the like, and does not require special bending equipment required for manufacturing the conventional lattice streak 7. For this reason, it is possible to easily cope with a change in the rebar diameter or the size of each part according to the slab thickness, for example, the size of the diagonal member forming the lattice.

[0016] In the floor structural material, the connecting support bar is
Having multiple holding parts, diagonal parts, and legs for each of the upper and lower chord muscles is convenient in terms of the number of mounting steps and strength, but on the other hand, if the number is too large, the production becomes troublesome. The most desirable configuration is that the connecting support muscle is
The leg portion is formed at an intermediate portion in the axial direction of the reinforcing bar material, and a pair of the lower chord muscle holding portions is formed on both sides of the leg portion,
A pair of the above-mentioned oblique members are extended in a V-shape, each of which extends upward from the pair of lower-chord bars, and a pair of upper-chord bars are formed at the ends of the reinforcing bars at the upper ends of the pair of slant members. It was done.

Further, in the floor structural material, two lower chords are provided for one upper chord, and the connecting supporting muscles are generally opposed to both sides of the upper chord. There is a mode provided in pairs. This is because the upper support is obliquely supported by the connecting support muscles from both sides thereof, so that the connecting support muscle has a function as a restraining member that suppresses lateral buckling of the upper chord muscle of the conventional support muscle 3. . In this case, since the lattice portion is doubled, the rigidity against a downward load can be increased.

In the floor structural member, one lower chord is provided for one upper chord, and a plurality of the connecting support bars are shifted in the axial direction of the upper and lower chords. However, there is a mode in which they are alternately provided on opposite sides of the upper chord. This is intended to reduce costs by reducing the number of reinforcing bars and reducing the amount of reinforcing bars.
In this case, the function of suppressing lateral buckling of the upper chord muscles can be enhanced by providing a connecting holding material for interconnecting the upper chord muscles of each row adjacent in the transverse direction of the deck plate. In addition, in the case of a large deck, since high-strength steel is generally used because of the use of a large-diameter reinforcing bar, it is not necessary to use the above-described connection holding material unless the deck plate has a particularly long length in the longitudinal direction. Absent.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A floor structural member according to the present invention will be described below in detail with reference to the embodiments shown in FIGS.

The first floor structural member 10 shown in FIG. 2 and FIG.
Is a rectangular iron plate whose width in the short direction is the same as the conventional structure and whose length in the long direction is adapted to the structure of the building, and reinforcement rib processing is applied along the long direction The deck plate 11 is used, and a floor reinforcing bar is attached to the upper surface of the deck plate 11.

The floor reinforcing bars are respectively provided at both ends in the longitudinal direction of the deck plate 11, and the base thereof is connected to the deck plate 1.
1 and both end portions are fixed to the end fixing member 12, and the end fixing members 12, 12 are fixed to the end fixing members 12, 12, respectively.
The upper chord 13 and the lower chord 14 are provided between the upper and lower twelve lines 12 and the connecting support muscle 15 for supporting the upper chord 13 and the lower chord 14 in a connected state.

The end fixing member 12 is formed in a cross shape in which a horizontal fixing piece 12b is joined to the middle part in the height direction of the vertical fixing piece 12a in a crossed state, and both ends are formed at both ends with respect to the upper end side of the vertical fixing piece 12a. The upper chordal bar 13 is erected with the parts fixed to each other, and two lower chordal bars 14 are erected in the horizontal state with both ends fixed to both ends of the horizontal fixing piece 12b. The upper chordal muscle 13 and the lower chordal muscle 14 and the end fixing member 12, and the end fixing member 12 and the deck plate 11 are joined by welding.

The connecting support bar 15 includes upper and lower chord bar holders 17 and 18 which are bent in a ring shape, a linear diagonal member 19 connecting the both holders 17 and 18, and a lower chord. And a leg portion 20 hanging down from the muscle holding portion 18. The connecting support bar 15 is formed by bending a single reinforcing bar having a predetermined length, and has a leg 2 at an intermediate portion in the axial direction of the reinforcing bar.
A pair of lower chord muscle holding portions 18 are formed on both sides of the leg portion 20, and a pair of diagonal portions 19 extend from the pair of lower chord muscle holding portions 18 into a V-shape extending upward. A pair of upper chordal bar holding portions 17 are formed at the ends of the reinforcing bars at the upper ends of the pair of diagonal members 19.

The connecting support bars 15 are arranged in a required number in the axial direction of the upper and lower chord bars 13 and 14. These connecting support bars 15 are all of the same shape,
The pair of connecting supporting muscles 15 are arranged at positions substantially opposite to each other with the upper chordal muscle 13 interposed therebetween. In order to prevent the respective upper chordal muscle holding portions 17 from interfering with each other, the upper chordal muscle 1
3 are shifted in the axial direction.

The diagonal portions 19 of the connecting support bars 15 form a lattice as a whole by connecting the connecting support bars 15 in a plurality of rows in the axial direction of the upper chordal bar 13 and the lower chordal bar 14, thereby forming a conventional vertical lattice bar. 7 has a function of increasing the rigidity by connecting the upper chordal muscle 13 and the lower chordal muscle 14 to each other. In this embodiment, the lattice by the diagonal member 19 is 2
Because of the overlap, the rigidity against the overload is also increased.
The diagonal portion 19 also functions as a restraining member that suppresses the lateral buckling of the upper chord 13 in the transverse direction of the deck plate 11. The leg 20 is composed of the upper chord 13 and the lower chord 1
4 functions as a spacer for holding the deck 4 at a predetermined height on the deck plate 11. The legs 20 are joined to the upper surface of the deck plate 11 by spot welding.

Each of the holding portions 1 of the upper chordal muscle 13 and the lower chordal muscle 14
Reference numerals 7 and 18 are attached so as to be wound around substantially the entire circumference of the upper chordal muscle 13 and the lower chordal muscle 14. This holding part 17, 1
8 is actually mounted on a spring making machine or a multi-bending machine in such a manner that it is bent into a ring shape having a required diameter in advance, and the upper chordal muscle 13 and the lower chordal muscle 14 are inserted therein. . When the holding portions 17, 18 and the upper chordal bar 13 and the lower chordal bar 14 are fitted tightly, a sufficient joint strength can be obtained, and it is not necessary to particularly weld them.
Note that a mode in which the holding portions 17 and 18 are crimped and connected to the upper chordal muscle 13 and the lower chordal muscle 14 is also possible. Further, even when welding is performed, troublesome positioning and fixing operations such as conventional lattice streaks are not required, so that welding can be performed relatively easily.

When the connecting support bars 15 are configured as described above, only one type of connecting support bars 15 is required, so that the work of assembling the floor reinforcing bar is facilitated and the inconvenience of holding a plurality of types of parts in stock is eliminated. This is effective in reducing production costs and improving work efficiency.

FIGS. 4 and 5 show an embodiment of the second floor structural member. In this floor structural member 30, first and second two types of connecting support bars 31, 32 having different shapes are provided. in use. Other deck plate 11, end fixing material 1
2. The upper chordal muscle 13 and the lower chordal muscle 14 are the same as those in the above-described embodiment, and are denoted by the same reference numerals, and detailed description thereof will be omitted.

The first connecting support bar 31, like the connecting support bar 15, comprises a pair of upper chord holders 33, a pair of lower chord holders 34, a pair of diagonal members 35, and legs 36. Similarly, the second connecting support bar 32 also includes a pair of upper chord bar holders 37, a pair of lower bar holders 38, a pair of diagonal members 39, and legs 40. Both connecting support bars 31, 32
Are different in the dimensions and angles of the oblique members 35 and 39. That is, the diagonal portion 35 of the first connection support bar 31 is longer than the diagonal portion 39 of the second connection support bar 32, and the angle between the pair of diagonal portions 35 is equal to that of the pair of diagonal portions 39. The first connecting support bar 31
Between the pair of upper chordal muscle holding portions 33,
Are disposed.

In this manner, the first and second connecting support bars 31 and 32 face each other with the upper chord bar 13 interposed therebetween, and the legs 36 and 40 located at the centers thereof are in the short direction of the deck plate 11. The legs 3
Spot welding between 6, 40 and the deck plate 11 becomes easy.

FIGS. 6 and 7 show an embodiment of a third floor structural member. In this floor structural member 40, an end fixing member having the same shape as the vertical fixing piece 12a of the end fixing member 12 is used. One lower chord 44 is provided for one upper chord 43 in a manner supported by the material 22, and a plurality of connecting support 45
Are alternately provided on opposite sides of the upper and lower chords 43 and 44 while displacing them in the axial direction.
The end fixing member 22 and the upper chordal bar 43 and the lower chordal bar 44, and the end fixing member 22 and the deck plate 11 are fixed to each other by welding.

The connecting support bars 45 are, similarly to the above-described connecting support bars, provided with both holding portions 47, 48 of the upper chordal bar 43 and the lower chordal bar 44.
And a diagonal member 49 connecting the holding parts 47 and 48 to each other.
And a leg 50 hanging down from the lower chordal muscle holding portion 48. The upper surface of the deck plate 11 and the lower surface of the leg 50 in contact therewith are joined to each other by spot welding.

In this embodiment, the cost is reduced by reducing the amount of reinforcing bars. Compared with the first and second embodiments, the number of connecting support bars and lower chord bars is reduced by half. Have been. On the other hand, the function of suppressing lateral buckling of the upper chordal muscle 43 is reduced, and the legs 50 are obliquely hung down from the lower chordal muscle holding portion 48 in order to increase the lateral rigidity.

To further enhance the function of suppressing the lateral buckling of the upper chordal muscle 43, as shown in FIG.
Upper chordal bar 4 adjacent to each other in a row along the short direction of
3 is connected to the deck plate 1
1 may be attached to a key point in the longitudinal direction. Connection holding material 52
May be simply attached to the upper chordal muscle 43 or tied to such an extent that the upper chordal muscle 43 can be held. Here, the four upper chordal muscles 43
Are simultaneously provided at each of the intervals corresponding to the upper chordal bar 43, the locking recesses 53 in which the rebars are curved in an arc shape are provided at four places. It may be divided into two pieces and connected, or an end may be extended to both lower chords 44 on both sides to be connected to the lower chords 44. In addition, a mode in which a straight connecting reinforcing bar is provided on the upper chordal bar 43 and joined by welding is also possible.

In each of the above embodiments, the connecting support bar is formed such that a pair of diagonal members form a V-shape by providing a leg at the center of the reinforcing bar in the axial direction. The streaks are not limited to such a form, and a pair of diagonal members may be configured to form an inverted V shape,
Alternatively, a mode in which the leg is formed at the terminal of the reinforcing bar is also possible.

For example, in the connecting support bar 61 shown in FIG. 9, an upper chord holding portion 62 is formed at the center of the reinforcing bar in the axial direction, and a pair of diagonal members 63 extend downward from the upper chord holding portion 62. The lower chordal bar holding portion 64 is formed at the lower end of the diagonal member 63, and the leg 65 is formed at the end of the reinforcing bar hanging down from the lower chordal bar holding portion 64.

[0037]

As is clear from the above description, in the floor structural material according to the present invention, the number of welding points is greatly reduced, and the remaining welding points can be relatively easily performed. In addition, high-precision manufacturing is not required for the production of the connecting support bar, and general-purpose bending equipment is sufficient. For this reason, the dedicated equipment is simplified, the equipment cost is reduced, and an optimal design according to the slab thickness, which is advantageous in terms of cost, becomes possible, and a great effect is obtained in reducing the manufacturing cost of a large deck.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part showing an embodiment of a floor structural material according to a conventional technique.

FIG. 2 is an essential part perspective view showing a first embodiment of a floor structural material according to the present invention.

FIG. 3 is a plan view of a main part of the floor structural material shown in FIG. 2;

FIG. 4 is a perspective view of an essential part showing a second embodiment of the floor structural material according to the present invention.

FIG. 5 is a plan view of a main part of the floor structural material shown in FIG. 4;

FIG. 6 is an essential part perspective view showing a third embodiment of a floor structural material according to the present invention.

FIG. 7 is a plan view of an essential part of the floor structural material shown in FIG. 6;

FIG. 8 is a vertical cross-sectional view showing a mode in which a connection holding material is mounted.

FIG. 9 is a perspective view of a main part of a floor structural member to which a connecting support bar of another embodiment is applied.

[Explanation of symbols]

 1,10,30,40 Floor structure material 2,11,41 Deck plate 3 Support bar 4,12,42 End fixing material 5,13,43 Upper chord 6,14,44 Lower chord 7 Vertical lattice 15,15 , 32, 45, 61 Connecting support bars 17, 33, 37, 47, 62 Upper chord holders 18, 34, 38, 48, 64 Lower chord holders 19, 35, 39, 49, 63 Diagonal members 20, 36 , 40, 50, 65 Leg 52 Connection holding material 53 Locking recess

Claims (4)

[Claims] 1. A deck plate comprising: a deck plate; and a floor reinforcing bar attached to an upper surface of the deck plate. The floor reinforcing bar includes end fixing members juxtaposed at both longitudinal ends of the deck plate; The upper and lower chord muscles, which are vertically arranged in parallel between the fixing members, and a connection support muscle that supports the upper and lower chord muscles in a connected state, the connection support muscle having a predetermined length. A straight diagonal member which is formed by bending a reinforcing steel material of a book, and which holds each of the upper chordal and lower chordal holding portions bent in a ring shape and the upper chordal and lower chordal holding portions. And a plurality of legs which are suspended from the lower chord holding portion, and a plurality of the oblique members are provided in the axial direction of the upper chord and lower chord so as to form a lattice as a whole. Floor structural materials. 2. The connecting support bar has the leg portion formed at an intermediate portion in the axial direction of the reinforcing bar material, and a pair of lower chord holding portions formed on both sides of the leg portion, the pair of lower chord bars being provided. A pair of the above-mentioned oblique members are extended in a V-shape, each of which extends upward from the holding portion. The floor structural material according to claim 1, wherein: 3. The apparatus has two lower chords with respect to one upper chord, and the connecting support bars are provided in pairs on both sides of the upper chord so as to be substantially opposed to each other. The floor structural material according to claim 1 or 2, wherein: 4. The apparatus according to claim 1, further comprising: one lower chord for one upper chord, wherein the connecting support bars are opposite to each other with the upper chord interposed therebetween while being shifted in the axial direction of the upper chord and the lower chord. The floor structural material according to claim 1 or 2, wherein the structural members are provided alternately.