JP2958852B2 - Steel concrete composite plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel-concrete composite plate used as a structure in the fields of civil engineering and construction.

[0002]

2. Description of the Related Art As a reinforced concrete structure, a reinforced cage structure in which a reinforcing bar is assembled in a cage shape and concrete is cast is well known. This reinforced cage structure is generally shown in FIG.
As shown in (1), the main reinforcement 22 is arranged up and down, the assembly reinforcement 23 is arranged perpendicular to the main reinforcement 22, and the intersection of the main reinforcement 22 and the assembly reinforcement 23 is fixed by a binding wire 24 to assemble. Further, a stirrup (shear reinforcing bar) 25 is arranged so as to surround the main bar 22 and also serves as a vertical reinforcing bar, thereby forming a reinforced cage unit 20 into which concrete 21 is cast. In some cases, the stirrup 25 is not used, and is selectively used depending on the situation (conventional example 1).

[0003] Further, in the above-described reinforcing bar cage structure, since the reinforcing bar tends to be overcrowded and its usage tends to increase, as one method for solving this problem, as shown in FIG. A steel reinforced concrete structure (abbreviated as SRC) 26 in which a steel frame 27 is covered with reinforcing bars 28 and 28 and concrete 21 and which is strong and strong is used (conventional example 2).

Further, Japanese Utility Model Publication No. Sho 56-40888 discloses that a T-shaped steel comprising a web and a flange is used, the web portion of the T-shaped steel is cut into a waveform, and a horizontal streak is formed at the top and bottom of the waveform. There is disclosed a concrete-filled steel grid floor plate in which the steel bars are arranged so as to intersect the main bars in a grid pattern and concrete is poured into the grid bars (conventional example 3).

[0005]

The reinforcing bar cage structure of the prior art 1 has a structure in which the diameter of the reinforcing bars is increased or the spacing between the reinforcing bars is reduced with the increase in the size and strength of the structure. Reinforcing bars tend to become more and more dense, for example, by arranging them in multiple stages, and their usage increases. Along with this tendency, there is a problem that workability such as reinforcing work is deteriorated, and that when the concrete is poured, the integrity of the concrete is impaired due to poor wraparound of the concrete.

Further, in the steel-framed reinforced concrete structure of Conventional Example 2, although the above-mentioned problem of overcrowding of the reinforcing bars has been solved, H-beams and the like used therefor generally have lower adhesion to concrete than deformed reinforcing bars. In addition, there is a problem that peeling and slipping easily occur. Also, as the proportion of steel frame increases, the crack width of concrete tends to increase,
The problem of corrosion of steel occurs. For this reason, there is also a problem that the surroundings must be sufficiently protected by reinforced concrete by increasing the cover of the steel frame.

Further, the concrete-filled steel lattice floor plate of the prior art 3 has no flange at the upper part, so that its use is limited only to the floor plate, and the cost is high because it takes time to cut the web part. There is.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has as its object to obtain a steel-concrete composite slab which can reduce the amount of use of a reinforcing bar and can realize a reduction in thickness and weight. .

[0009]

According to the present invention, there is provided a steel-concrete composite plate comprising a plurality of reinforcing bars bent in a longitudinal direction in a corrugated manner, and a plurality of reinforcing bars arranged side by side in a width direction; And a plurality of upper and lower horizontal streaks arranged perpendicular to the vertical streak, and supported inside each of the vertical or upper horizontal streak or the lower horizontal streak, extending in the longitudinal direction and extending in the width direction A framing unit is composed of a plurality of upper and lower chords made of steel plates arranged side by side, and concrete is cast into the framing unit.

[0010] In the above steel-concrete composite plate, a curvature is provided in the longitudinal direction of the surface, or a projection is provided on at least one surface of the upper chord material and the lower chord material.

[0011]

[Function] A vertical frame, upper horizontal bar, lower horizontal bar, upper chord and lower chord are supported mutually and an integrated frame unit is placed in a concrete formwork, concrete is poured into the concrete formwork, and concrete is solidified. After that, the formwork is removed to form a steel-concrete composite plate.

[0012] Further, by providing a curvature in the longitudinal direction of the surface, it is used as a segment of a tunnel shaft. Further, by providing projections on both surfaces or one surface of the upper chord material and the lower chord material, the adhesiveness of concrete is improved.

[0013]

Embodiment 1 FIG. 1 is a perspective view showing the structure of a first embodiment of the present invention. In the figure, reference numeral 1 denotes a steel-concrete composite plate according to the present invention. The steel-concrete composite plate 1 has a longitudinal bar 2 in which a plurality of reinforcing bars bent in a longitudinal direction are arranged side by side, and an upper horizontal bar 3 supported on the inner sides of the top and bottom of the corrugation of the longitudinal bar 2, respectively. And a lower transverse bar 4 and a plurality of steel upper and lower chord members 5, which are supported inside each of the upper and lower horizontal bars 3 and 4 or the vertical bars 2, extend in the longitudinal direction, and are arranged in plural in the width direction. The framing unit 7 is constructed, and concrete 9 is cast inside and outside the framing unit 7. In addition, the above-mentioned vertical streaks 2, upper horizontal streaks 3, lower horizontal streaks 4, and upper chord members 5,
The mutual support of the lower chords 6 is performed by tack welding or bundling with wires or the like.

On the outer surfaces of the upper chord material 5 and the lower chord material 6,
The projections 8 are formed to improve the adhesion of the concrete 9. The protrusion 8 may use a striped steel plate as the upper chord member 5 and the lower chord member 6 and use the protrusion of the striped steel plate, or may weld a stud to the surface of the upper chord member 5 and the lower chord member 6. In short, any means having an effect of increasing the adhesion of the concrete 9 may be used, and there is no particular limitation. In addition,
The projections 8 provided on the upper chord member 5 and the lower chord member 6 may be provided on both surfaces thereof, or may be provided on only one surface.

Such a steel-concrete composite plate 1 is composed of a concrete formwork (see FIG. 1) in which a vertical bar 2, an upper horizontal bar 3, a lower horizontal bar 4, an upper chord member 5, and a lower chord member 6 are mutually supported and integrated. (Not shown), the concrete is poured into the concrete form, and after the concrete is solidified, the form is removed.

In the steel-concrete composite slab 1 according to the present invention, the upper chord member 5 and the lower chord member 6 made of a steel plate function as reinforcing bars for ensuring strength. Therefore, the required amount of rebar is ensured by the thickness and width of the upper chord member 5 and the lower chord member 6. For example, a diameter of 25 mm (a sectional area of 5.067 c
If a steel plate having a thickness of 5.07 mm and a width of 100 mm is used as the upper chord member 5 and the lower chord member 6 instead of arranging the reinforcing bar of m ² ), the same cross-sectional area as that of the reinforcing bar is obtained, and equivalent strength can be obtained.

Further, by replacing the reinforcing steel with the steel plates (upper chord 5 and lower chord 6) in this way, the thickness corresponding to the rebar diameter of 25 mm becomes 5.07 mm in the case of the steel plate, The thickness of the concrete composite plate can be reduced, and the weight can be reduced. Further, the force generated at the boundary surface between the concrete 9 and the steel plate (the upper chord member 5 and the lower chord member 6) is transmitted through the projection 8 on the steel plate surface, so that the adhesive force between the steel plate and the concrete is ensured. The width of cracks is small, and the integration with concrete is improved. In addition, the vertical bar 2 has a function of a reinforcing bar for assembling the upper chord member 5 and the lower chord member 6, and also functions as a shear reinforcing bar.

Embodiment 2 FIG. 2 shows an example in which a steel-concrete composite plate according to the present invention is applied to a segment in the case of being used as a tunnel shaft, and a vertical streak 2a, an upper chord member 5a and a lower chord member 6a are It is formed on a curved surface matched to the tunnel diameter. In this case, the upper chord member 5a and the lower chord member 6a may be curved in accordance with the tunnel diameter, and the vertical streak 2a may be arranged in accordance with the upper chord member 5a and the lower chord member 6a. Reference numeral 10 denotes a bolt insertion pipe, 11 denotes a bolt hole formed corresponding to the bolt insertion pipe 10, 12 denotes a joint plate, and 13 denotes a grout hole.

FIG. 3 is a cross-sectional view comparing the steel-concrete composite plate according to the present invention with the conventional reinforced concrete structure having the reinforced cage structure shown in FIG. 4, and FIG.
FIG. 3B shows a conventional technique. Concrete slab with width B = 120cm and girder height H = 70cm, diameter d = 32mm
Of the main streaks 22 at intervals of s = 100 mm
In contrast to the conventional technique in which two bars are arranged, in the present invention,
As the upper chord material 5 and the lower chord material 6, three steel plates with projections having a width of b = 300 mm and a thickness of t = 11 mm are arranged vertically three by three, so that the total cross-sectional area of the steel frame becomes equal to the total cross-sectional area of the rebar of the prior art. Thus, the same strength as that of the conventional reinforced cage structure can be obtained.

In the case of the prior art, the gap δ between the reinforcing steel bars is a gap of 68 mm, but the gap δ between the steel plates of the upper chord 5 and the lower chord 6 of the present invention is 100 mm, which is wider than in the prior art. In the present invention, the surroundings of concrete when 9 is poured are better.

[0021]

As is apparent from the above description, the steel-concrete composite plate according to the present invention has a vertical streak bent in a wavy shape, upper and lower horizontal streaks supported inside the wavy shape of the vertical streak, and upper and lower streaks. The upper and lower chords made of steel plates inside the horizontal streaks are integrated to form a framing unit, and concrete is poured into this framing unit. It is possible to reduce the arrangement work. In other words, since the upper horizontal line and the lower horizontal line are supported inside each of the top and bottom of the waveform of the vertical line,
The support position is automatically determined, so that the binding with the wire or the like can be easily performed. Further, an upper chord member and a lower chord member made of a steel plate are connected to the inside of the upper and lower horizontal streaks connected in this manner, thereby forming a frame unit. Therefore, between the upper and lower transverse or between the upper and lower chords,
For example, when a separating force is applied, a force that resists this force is generated inside the vertical streaks of the waveform and is quickly dispersed and transmitted to the components in the skeleton unit, so that high strength can be maintained. . As a result, according to the present invention, the workability and strength of the entire reinforcing bar can be improved, and the composite plate can be made thinner and lighter by the difference between the amount of the reinforcing bar and the amount of the steel plate constituting the upper chord material and the lower chord material. Extremely easy.

Also, by giving the surface a curvature,
Since it can be used as a segment of a tunnel shaft, the range of application can be expanded. Further, by providing the projections on at least one surface of the upper and lower chord members, the adhesion to concrete can be improved, so that the crack width is small and the integrity with concrete can be enhanced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a first exemplary embodiment of the present invention.

FIG. 2 is a perspective view showing a configuration of a second exemplary embodiment of the present invention.

FIG. 3 is an explanatory diagram for comparing the present invention with a conventional technology.
(A) is the present invention, and (b) is the prior art.

FIG. 4 is a perspective view showing an example of a conventional reinforced cage structure.

FIG. 5 is an explanatory view of a conventional steel-framed reinforced concrete structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel-concrete composite plate 2 Longitudinal streak 3 Upper horizontal streak 4 Lower horizontal streak 5 Upper chord 6 Lower chord 7 Frame unit 8 Projection 9 Concrete

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Soichi Ito 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Inside Nippon Kokan Co., Ltd. (72) Inventor Hiroshi Toida 1-10-15 Nihonbashi-Horidomecho, Chuo-ku, Tokyo No. Nippon Kokan Light Steel Co., Ltd. (56) References JP-A-49-28916 (JP, A) JP-A-54-153723 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) ) E21D 11/08

Claims (3)

(57) [Claims] 1. A longitudinal bar in which a plurality of reinforcing bars bent in a waveform in the longitudinal direction are juxtaposed in the width direction, and are supported inside each of the top and bottom of the waveform of the longitudinal bar, and are arranged orthogonal to the longitudinal bars. A plurality of upper and lower transverse bars and an upper chord member and a lower chord made of a steel plate supported inside each of the longitudinal or upper transverse or lower transverse bars, extended in the longitudinal direction, and arranged side by side in the width direction. A steel-concrete composite plate in which a framing unit is composed of materials and concrete is poured into the framing unit. 2. The method according to claim 1, wherein the surface has a curvature in a longitudinal direction.
The described steel-concrete composite version. 3. The steel-concrete composite plate according to claim 1, wherein a projection is provided on at least one surface of the upper chord material and the lower chord material.