JP2000080748A - Corrugated plate form and corrugated plate synthetic floor slab using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a corrugated plate form capable of supporting thicker concrete and a corrugated plate synthetic floor slab using the form. SOLUTION: A corrugated plate synthetic floor slab 20 is constituted by forming a concrete layer 22 of a predetermined thickness over a steel plate 21 for a corrugated plate form with one recessed stripe 21A and two recessed stripes 21B which is recessed almost 2 times deeper compared to the stripe 21A, both of which are alternately formed at predetermined intervals. And downward projected stripes 20A, 20B are formed in a bridge width direction in correspondence with the recessed stripes 21A, 21B of steel plate 21 of corrugated plate form on the surfaces lower that the recessed surfaces, and the projected stripes 20B with a larger depth corresponding to the deep recessed stripe 21B are jointed to the main girder 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a corrugated sheet form used for forming a floor slab of a bridge by placing concrete and a corrugated sheet slab using the same.

[0002]

2. Description of the Related Art Reinforced concrete floor slabs conventionally used as floor slabs for bridges and elevated roads are constructed by forming a formwork on a main girder at a site and arranging a reinforcing bar in the formwork to cast concrete. It is formed by doing.

[0005] As shown in a perspective view of FIG. 5, concave strips 51 are formed at predetermined intervals so that a steel plate is bent up and down in a trapezoidal shape so as to exhibit a waveform, as shown in a perspective view of FIG. It is conceivable to use a corrugated sheet called a so-called corrugated steel sheet.

[0004] Such a corrugated plate has higher rigidity in the extending direction of the concave streaks than a flat plate having the same thickness, so that it can be intermittently supported for a long span in the direction. ,
It can be used for a formwork that forms the lower surface of a reinforced concrete floor slab by extending between the main girders with the extending direction of the concave strip being the bridge width direction.

[0005]

However, even when the corrugated sheet as described above is used as a formwork, the weight that can be supported is naturally limited, and when it is used for a bridge, the required strength is obtained. Therefore, when the thickness of the floor slab is set, the weight of concrete may not be able to be supported depending on the distance between fulcrums.

[0006] The present invention has been made in view of the above problems, and has as its object to provide a corrugated sheet frame capable of supporting thicker concrete and a corrugated sheet composite slab using the same. And

[0007]

In order to achieve the above object, a corrugated sheet form according to the present invention has concave strips formed at predetermined intervals,
The concave depth is formed intermittently, for example, about twice as deep, and the upper surface thereof is configured to support concrete.

[0008] Further, as a corrugated sheet composite slab using the corrugated sheet form as described above, the corrugated sheet form is fixed to the upper surface of a girder member, and a concrete sheet having a predetermined thickness is provided on the upper surface side of the corrugated form. Is formed by casting.

Further, the corrugated sheet form is arranged so that the extending direction of the concave streak is set as the bridge width direction.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a partial longitudinal sectional view of a bridge using an example of a corrugated composite floor slab using a corrugated form according to the present invention, and FIG. 2 is a transverse sectional view thereof.

In the illustrated bridge 1, a main girder 10 is supported on a pier 2 by a bearing 3.
, And a corrugated composite slab 20 is supported on the upper surface of the main girder 10.

The main girder 10 is made of a steel plate, is formed in an I-shaped cross-sectional shape having a flange at both upper and lower edges and having a predetermined height. Have been.

The corrugated composite floor slab 20 is formed by forming a concrete layer 22 having a predetermined thickness on a corrugated form steel plate 21 serving as a corrugated form.

As shown in FIG. 3 which is an enlarged view of a portion A in FIG.
At the lower surface of 1B, the main girder 11 is fastened and fixed to the upper flange by bolts and nuts 11, and a reinforcing bar (not shown) is disposed thereon, and then concrete is cast to form a concrete layer 22. That is, the corrugated formwork steel plate 21 functions as a formwork that forms the lower surface of the concrete layer 22 and is so-called buried, and as a result, the corrugated composite floor slab 20 has strength of the corrugated formwork steel plate 21 and the concrete layer 22. It is synthesized to form a composite floor slab. In addition, by providing a dowel (not shown) on the upper surface side of the corrugated frame steel plate 21, the bonding strength between the corrugated frame steel plate 21 and the concrete layer 22 is increased.

The corrugated frame steel sheet 21 is provided with a single shallow concave 21A and two deep concaves 21B having a depth of about twice that at a predetermined interval with the uppermost surface as a reference surface 21S. The lower flat surface 21C, which is substantially the same height as the lower surface of the shallow concave stripe 21A, is formed between adjacent deep concave stripes 21B.

As described above, the shallow concave streak 21A and the deep concave streak 2
1B are formed alternately, so that the shallow concave stripes 21 are formed.
Compared to the case where only A is formed at a predetermined interval, the bending stiffness is increased because the second moment of area is increased, and it is possible to support the greater weight of the concrete layer 22 cast on the upper surface thereof. . That is, it is possible to support the thicker concrete layer 22, and conversely, if the weight of the concrete layer 22 is the same, it is possible to reduce the thickness of the concrete layer.

As shown in FIGS. 4 (A) and 4 (B), the corrugated frame steel plate 21 having such a shape has unit plates 21a having two concave stripes 21b alternately turned upside down at the end. It can be formed by welding. Unit plate 21a
Can be formed by welding and joining a trapezoidal section steel that is open upward, press forming, dividing an appropriate ready-made product, or the like.

The corrugated composite floor slab 20 constructed as described above
Then, on the lower surface thereof, the concave stripes 21A, 21
B, the downwardly protruding ridges 20A, 20B in the bridge width direction are formed, and the tall ridges 20 corresponding to the deep concave ridges 21B.
B joins to the main girder 10. Since these ridges 20A and 20 function as strength members in the bridge width direction such as horizontal ribs and cross beams, the slabs can have high strength in the direction.

The corrugated formwork of the present invention is not limited to a floor slab and may be used for other concrete structures.

[0020]

As described above, according to the corrugated sheet form of the present invention, the ridges are formed at predetermined intervals, and the depths of the ridges are intermittently formed to be deeper. The structure is designed to support the concrete with a small area, and the bending moment becomes larger because the second moment of area is larger than that in which only shallow concave streaks are formed at predetermined intervals. A greater weight of the concrete layer provided can be supported. That is, it is possible to support a thicker concrete layer, and conversely, if the weight of the concrete layer is the same, it is possible to reduce the thickness of the concrete layer.

In addition, since the depth of the deep groove is set to be about twice as large as that of the shallow groove, unit plates of the same shape having two grooves are alternately turned upside down and welded at the ends. It can be formed by joining and can be easily manufactured.

Furthermore, as a corrugated sheet composite slab using the corrugated sheet form, the corrugated sheet form is fixed to an upper surface of a girder member, and concrete having a predetermined thickness is formed on the upper surface side of the corrugated form. By being provided and formed, downward convex ridges are formed on the concrete layer at a portion corresponding to the concave ridges of the corrugated sheet formwork, and since these convex ridges function as strength members, a floor having a high strength in the direction is provided. It can be a plate.

In the corrugated sheet form, since the extending direction of the concave stripes is set as the bridge width direction, downward convex stripes in the bridge width direction are formed in the concrete layer, and these convex stripes are formed. Since it functions as a strength member in the bridge width direction, such as a horizontal rib or a cross beam, it can be a floor slab having high strength in the bridge width direction.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional view of a bridge using an example of a configuration of a corrugated composite floor slab using a corrugated formwork according to the present invention.

FIG. 2 is a cross-sectional view of FIG.

FIG. 3 is an enlarged view of a portion A in FIG. 1;

FIG. 4 is a partial cross-sectional view showing a manufacturing process of the corrugated form steel sheet, where (A) is a completed view and (B) is an exploded view.

FIG. 5 is a perspective view of a corrugated sheet as a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Main girder (girder member) 20 Corrugated composite floor slab 21 Corrugated plate form steel plate (corrugated plate form) 21A Shallow concave 21B Deep concave 22 Concrete layer (concrete)

Claims (4)

[Claims] 1. A corrugated plate type, wherein concave strips are formed at predetermined intervals, and the concave depth is formed intermittently deeply so as to support concrete on an upper surface thereof. frame. 2. The corrugated sheet form according to claim 1, wherein the depth of the deep groove is set to be about twice that of the shallow groove. 3. The corrugated sheet form is fixed to an upper surface of a girder member, and concrete having a predetermined thickness is cast on the upper surface side of the corrugated sheet form. 3. A corrugated sheet composite slab using the corrugated sheet form according to 2. 4. The corrugated composite floor slab according to claim 3, wherein the corrugated sheet formwork is provided with a direction in which the concave streak extends in a bridge width direction.