JP6970883B2 - Steel-concrete synthetic structural material - Google Patents

Description

The present invention relates to a steel-concrete synthetic structural material, and more particularly to a steel-concrete synthetic structural material capable of reducing the deviation between the steel material and the concrete material.

The steel-concrete synthetic structural material is composed of a steel material and a concrete material integrally, and is excellent in durability, workability, and the like. Such steel-concrete synthetic structural materials are used in the fields of, for example, bridge decks, tunnel segments, wall materials for steel structures, and the like.

For example, as described in Patent Documents 1 to 3, the steel-concrete synthetic slab is referred to as a rib arranged on a bottom steel plate (generally, a rib in the longitudinal direction is referred to as a vertical rib and a rib in the lateral direction is referred to as a horizontal rib. ) And a steel layer with stud gibber and a concrete layer cast on the steel layer. Since the "rib" is a member that supplements the rigidity of the floor slab, it is called a "stiffener", and the "stud gibber" is a member that reduces the displacement between the steel layer and the concrete layer, so it is a "slip prevention". It may also be called.

If there is a gap between the steel material and the concrete material, the function of the steel-concrete synthetic structural material will deteriorate or the deterioration will be accelerated, so it is desired to reduce the gap between the steel material and the concrete material. There is a need. In general, if the slip prevention of the stud gibber or the like is increased, the slip between the steel material and the concrete material can be reduced, but there is a problem that the number of parts and the work man-hours increase and the cost increases.

Further, as described in Patent Document 3, it has already been proposed that the horizontal ribs are provided with ribs in the vertical direction to increase the binding force of concrete and omit the stud gibber.

Japanese Unexamined Patent Publication No. 2011-157733 Japanese Unexamined Patent Publication No. 2013-11107 Japanese Unexamined Patent Publication No. 2017-72018

On the other hand, when the stiffener such as a rib has a flat surface parallel to the bottom steel plate (for example, a flange portion of a shaped steel), there is a problem that cracks are likely to occur in the concrete layer from the tip portion thereof.

The present invention has been devised in view of such a problem, and provides a steel-concrete synthetic structural material capable of reducing the deviation between a steel material and a concrete material while suppressing deterioration of a concrete layer. The purpose.

According to the present invention, a steel structural material containing a steel plate forming a steel layer and a stiffener arranged on the steel plate, and a steel structural material placed so as to embed the stiffener are placed on the steel structural material. A plurality of partition plates provided with a concrete material forming a concrete layer, wherein the stiffener is made of shaped steel with a web and a flange, and is arranged along the longitudinal direction of the stiffener. The plurality of partition plates are provided with a first partition plate having a predetermined width and having a tip extending to a position beyond the tip of the flange and serving as a starting point for causing a crack in the concrete layer, and the flange. A second partition plate extending to a position not exceeding the tip of the first partition plate and having a width smaller than that of the first partition plate is included, and the first partition plate and the second partition plate are alternately arranged. A steel-concrete synthetic structural material characterized by this is provided.

The plurality of partition plates may be arranged so as to have a gap with respect to either the web or the flange.

The plurality of partition plates may have an opening.

The stiffener may have an opening formed in the flange.

According to the steel-concrete synthetic structural material according to the present invention described above, by arranging a plurality of partition plates in the stiffener, the binding force of the concrete material by the steel structural material can be improved, and the steel structural material and concrete can be improved. It is possible to reduce the deviation from the material. In addition, by extending the partition plate to a position beyond the tip of the flange, the starting point that causes cracks (cracks) in the concrete layer can be partially moved, and the growth of cracks (cracks) can be suppressed. It is possible to suppress the deterioration of the concrete layer.

It is a top view which shows the steel-concrete synthetic structural material which concerns on one Embodiment of this invention. It is an enlarged view which shows the part II shown in FIG. 1, (a) is a plan view, (b) is the cross-sectional view taken along the line BB in FIG. 2 (a). It is a top view which shows the deformation example of a steel structural material, (a) is a 1st deformation example, (b) is a 2nd deformation example, (c) is a 3rd deformation example. It is sectional drawing which shows the deformation example of a steel structural material, (a) is a 4th deformation example, (b) is a 5th deformation example, (c) is a 6th deformation example, (d) is a 7th deformation example, ( e) shows an eighth modification, and (f) shows a ninth modification. It is sectional drawing which shows the deformation example of a steel structural material, (a) is a tenth deformation example, (b) is an eleventh deformation example, (c) is a twelfth deformation example, (d) is a thirteenth deformation example, ( e) shows the 14th modification.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 5 (e). Here, FIG. 1 is a plan view showing a steel-concrete synthetic structural material according to an embodiment of the present invention. 2A and 2B are enlarged views showing a part II shown in FIG. 1, where FIG. 2A is a plan view and FIG. 2B is a cross-sectional view taken along the line BB in FIG. 2A. For convenience of explanation, FIG. 1 illustrates a state in which a part of the concrete layer is cut out.

As shown in FIGS. 1 to 2 (b), the steel-concrete synthetic structural material 1 according to the embodiment of the present invention includes a steel plate 21 forming a steel layer and a stiffener arranged on the steel plate 21. A steel structural material 2 including 22 and a concrete material 3 cast so as to embed the stiffening material 22 to form a concrete layer on the steel structural material 2 are provided, and the stiffening material 22 is provided with a web 22w. It is made of channel steel with a flange 22f, and is provided with a plurality of partition plates 23 arranged along the longitudinal direction of the stiffener 22. The partition plate 23 extends to a position beyond the tip of the flange 22f. It includes an extended first partition plate 23a and a second partition plate 23b extended to a position not exceeding the tip of the flange 22f.

The steel-concrete synthetic structural material 1 is used, for example, as a deck of a bridge, a segment of a tunnel, a wall material of a steel structure, or the like. As shown in FIG. 1, for example, the steel-concrete synthetic structural material 1 has a rectangular plate shape, and has a structure in which a steel layer and a concrete layer are vertically laminated. The steel layer is composed of a steel plate 21 (for example, a bottom steel plate of a deck slab) forming one surface of the steel-concrete synthetic structural material 1. The stiffener 22 is a reinforcing member that enhances the rigidity of the steel plate 21, and is also a coupling member that enhances the integrity with the concrete layer.

Steel material 2, for example, as shown in FIG. 1, the complement Tsuyoshizai 22 is disposed. Generally, the stiffener 22 arranged along the lateral direction (X-axis direction in the figure) is referred to as a lateral rib. In the present embodiment, the partition plate 23 is arranged on the stiffener 22 constituting the lateral rib. The steel structural material 2 may be provided with a slip stopper such as a stud gibber 24 arranged on the steel plate 21.

The concrete material 3 is cast on the steel structural material 2, and for example, as shown in FIG. 2B, the stiffener 22 is embedded in the concrete material 3. Therefore, when the concrete material 3 is poured around the stiffener 22 to solidify the concrete material 3 at the time of casting, the concrete material 3 is bonded to the steel structural material 2. In FIG. 2B, for convenience of explanation, the first partition plate 23a is shown by allowing the concrete material 3 to pass through.

The stiffener 22 is made of channel steel, for example, as shown in FIG. 2 (b). Therefore, the stiffener 22 has a single web 22w and a pair of flanges 22f. The flange 22f arranged at the lower end of the web 22w is fixed to the steel plate 21. The flange 22f arranged at the upper end of the web 22w is embedded in the concrete material 3 together with the web 22w.

As shown in FIGS. 2A and 2B, the plurality of partition plates 23 are spaces extending in the longitudinal direction (X-axis direction in the figure) surrounded by the web 22w and the flange 22f of the stiffener 22. Are arranged at regular intervals so as to form a plane substantially perpendicular to the X-axis. The first partition plate 23a and the second partition plate 23b have, for example, a rectangular shape fixed along the inside of the web 22w and the flange 22f. In FIG. 2A, for convenience of explanation, the concrete material 3 is omitted and only the steel structural material 2 is shown.

Further, as shown in FIG. 2A, the first partition plate 23a has a width W1 larger than the width of the flange 22f, and the second partition plate 23b has a width W2 substantially equal to the width of the flange 22f. doing. Therefore, as shown in the figure, the first partition plate 23a is extended to a position beyond the tip of the flange 22f, and the second partition plate 23b is extended so as not to exceed the tip of the flange 22f.
The width W2 of the second partition plate 23b may be set smaller than the width of the flange 22f. Further, the protruding amount of the first partition plate 23a is arbitrarily designed according to conditions such as the size of the stiffener 22 and the plate thickness of the first partition plate 23a. Further, the protrusion amount of the first partition plate 23a may be designed to have a different size depending on the position where the first partition plate 23a is arranged.

In the present embodiment, as shown in FIGS. 1 and 2A, the first partition plate 23a and the second partition plate 23b are arranged alternately. However, the arrangement is not limited to this, and for example, a plurality of second partition plates 23b may be arranged between the pair of first partition plates 23a, or the pair of second partition plates 23b may be arranged. A plurality of first partition plates 23a may be arranged between them.

By arranging the plurality of partition plates 23 (first partition plate 23a and second partition plate 23b) on the stiffener 22 in this way, the binding force of the concrete material 3 by the steel structural material 2 can be improved. , The deviation between the steel structural material 2 and the concrete material 3 can be reduced. Further, by arranging the partition plate 23 on the stiffener 22, it is possible to omit the slip prevention of the stud gibber 24 and the like, and it is possible to reduce the cost of the steel-concrete synthetic structural material 1.

By the way, when the stiffener 22 is embedded in the concrete layer, cracks are likely to occur in the concrete layer from the tip of the flange 22f. That is, the steel-concrete synthetic structural material 1 having the stiffener 22 is likely to have cracks (cracks) along the line segment L1 shown in FIG. 2B, starting from the tip P1 of the flange 22f. Further, the cracks (cracks) generated from the tip P1 will propagate in the X-axis direction of FIG. 2A.

In the present embodiment, by extending the first partition plate 23a to a position beyond the tip P1 of the flange 22f, the starting point at which the concrete layer in the portion where the first partition plate 23a is arranged is cracked is set as the starting point. It can be moved to the tip P2 of the partition plate 23a. Therefore, even if the crack (crack) generated from the tip P1 tries to grow in the X-axis direction in the figure, the position of the starting point is displaced in the middle, so that the crack (crack) growth is suppressed. It is possible to suppress the deterioration of the concrete layer.

Here, a modified example of the steel structural material 2 will be described with reference to FIGS. 3 (a) to 3 (c). 3A and 3B are plan views showing a modified example of a steel structural material, where FIG. 3A shows a first modified example, FIG. 3B shows a second modified example, and FIG. 3C shows a third modified example. In each figure, the concrete material 3 is omitted and only the steel structural material 2 is shown.

In the first modification shown in FIG. 3A, the opening 22h is formed in the flange 22f of the stiffener 22. When the first partition plate 23a and the second partition plate 23b are arranged on the stiffener 22, a space surrounded by these partition plates 23 and the stiffener 22 is formed, so that the opening 22h is formed. Thereby, the fluidity of the concrete can be improved at the time of placing the concrete. Further, by forming the opening 22h in the flange 22f above the stiffener 22, it can be used as a hole for venting air, and defects in the concrete layer can be reduced.

In FIG. 3A, the opening 22h is formed at the root of the second partition plate 23b, but the position is not limited to this. For example, the opening 22h may be formed at the root portion of the first partition plate 23a, or may be formed at an intermediate portion between the first partition plate 23a and the second partition plate 23b.

In the second modification shown in FIG. 3B, all of the partition plates 23 are composed of the first partition plate 23a. As described above, even when all the partition plates 23 are configured on the first partition plate 23a extending to a position beyond the tip of the flange 22f, the same effect as that of the above-described embodiment can be obtained.

In the third modification shown in FIG. 3C, the third partition plate 23c is arranged on the web 22w of the portion where the flange 22f of the stiffener 22 does not exist. In the illustrated modification, the third partition plate 23c is arranged at a position corresponding to the back side of the second partition plate 23b shown in FIG. 2A, and the second partition plate 23b is omitted. As described above, even when the third partition plate 23c is arranged on the back surface of the web 22w of the stiffener 22, the binding force of the concrete material 3 by the steel structural material 2 can be improved. Further, the third partition plate 23c may be arranged while leaving the second partition plate 23b, or the third partition plate 23c may be arranged on the back side of the first partition plate 23a.

Next, a modification of the steel structural material 2 will be described with reference to FIGS. 4 (a) to 4 (f). 4A and 4B are cross-sectional views showing a modified example of a steel structural material, where FIG. 4A is a fourth modified example, (b) is a fifth modified example, (c) is a sixth modified example, and (d) is a seventh modified example. A modified example, (e) shows an eighth modified example, and (f) shows a ninth modified example. In each figure, the concrete material 3 is omitted and only the steel structural material 2 is shown.

In the fourth modification shown in FIG. 4A, the opening 23h is formed in the partition plate 23. The opening 23h may be formed on both the first partition plate 23a and the second partition plate 23b, or may be formed on only one of them. By forming such an opening 23h, it is possible to improve the fluidity of concrete at the time of placing concrete in the space surrounded by the partition plate 23 and the stiffener 22.

In the fifth modification shown in FIG. 4B, a gap 23s is formed between the partition plate 23 and the upper flange 22f. The gap 23s may be formed in both the first partition plate 23a and the second partition plate 23b, or may be formed in only one of them. By forming such a gap 23s, it is possible to improve the fluidity of concrete at the time of placing concrete in the space surrounded by the partition plate 23 and the stiffener 22.

In the sixth modification shown in FIG. 4C, a gap 23t is formed between the partition plate 23 and the lower flange 22f. The gap 23t may be formed in both the first partition plate 23a and the second partition plate 23b, or may be formed in only one of them. By forming such a gap 23t, it is possible to improve the fluidity of concrete at the time of placing concrete in the space surrounded by the partition plate 23 and the stiffener 22. Further, as shown in the figure, the height of the first partition plate 23a and the height of the second partition plate 23b may be formed to be different sizes.

In the seventh modification shown in FIG. 4D, a gap 23u is formed between the partition plate 23 and the web 22w. The gap 23u may be formed in both the first partition plate 23a and the second partition plate 23b, or may be formed in only one of them. By forming such a gap 23u, it is possible to improve the fluidity of concrete at the time of placing concrete in the space surrounded by the partition plate 23 and the stiffener 22.

In the eighth modification shown in FIG. 4 (e), the first partition plate 23a is formed in a triangular shape. The triangular first partition plate 23a is fixed to, for example, the upper flange 22f. With such a configuration, the gap 23t can be formed below the first partition plate 23a, and the gap 23s can be formed above the second partition plate 23b.

In the ninth modification shown in FIG. 4 (f), the first partition plate 23a and the second partition plate 23b are formed in a triangular shape, and the first partition plate 23a is fixed to the upper flange 22f to form the second partition. The plate 23b is arranged on the lower flange 22f. Even with such a configuration, it is possible to improve the concrete fluidity while maintaining the binding force of the concrete layer in the steel structural material 2.

Next, a modification of the steel structural material 2 will be described with reference to FIGS. 5 (a) to 5 (e). 5A and 5B are cross-sectional views showing a modified example of a steel structural material, where FIG. 5A is a 10th modified example, (b) is an 11th modified example, (c) is a 12th modified example, and (d) is a 13th modified example. A modified example, (e) shows a 14th modified example. In each figure, the concrete material 3 is omitted and only the steel structural material 2 is shown.

In the tenth modification shown in FIG. 5A, the stiffener 22 is made of L-shaped steel (angle steel). When the stiffener 22 is made of L-shaped steel, the flange 22f is arranged upward and the tip of the web 22w is fixed to the steel plate 21. Then, the partition plate 23 (first partition plate 23a and second partition plate 23b) is arranged in the space surrounded by the steel plate 21 and the L-shaped steel. The arrangement of the partition plate 23 is not limited to the configuration shown in the figure, and the one shown in the above-described modification can be appropriately applied.

In the modified examples shown in FIGS. 5 (b) and 5 (c), the stiffener 22 is made of H-shaped steel. When the stiffener 22 is made of H-shaped steel, the lower flange 22f is fixed to the steel plate 21 in the same manner as in the above-described embodiment. Then, the partition plate 23 (first partition plate 23a and second partition plate 23b) is arranged in the space surrounded by the web 22w and the flange 22f. The arrangement of the partition plate 23 is not limited to the configuration shown in the figure, and the one shown in the above-described modification can be appropriately applied.

Further, when the stiffener 22 is made of H-shaped steel, the partition plate 23 (first partition plate 23a and second partition plate 23b) is formed only on one side as in the eleventh modification shown in FIG. 5 (b). Or the partition plates 23 (first partition plate 23a and second partition plate 23b) may be arranged on both sides as in the twelfth modification shown in FIG. 5 (c). May be good. The same applies when the stiffener 22 is made of I-shaped steel.

In the modified examples shown in FIGS. 5 (d) and 5 (e), the stiffener 22 is made of T-shaped steel. When the stiffener 22 is made of T-shaped steel, the flange 22f is arranged upward and the tip of the web 22w is fixed to the steel plate 21. Then, the partition plate 23 (first partition plate 23a and second partition plate 23b) is arranged in the space surrounded by the steel plate 21 and the T-shaped steel. The arrangement of the partition plate 23 is not limited to the configuration shown in the figure, and the one shown in the above-described modification can be appropriately applied.

Further, when the stiffener 22 is made of T-shaped steel, the partition plate 23 (first partition plate 23a and second partition plate 23b) is formed only on one side as in the thirteenth deformation example shown in FIG. 5 (d). Or the partition plates 23 (first partition plate 23a and second partition plate 23b) may be arranged on both sides as in the 14th modification shown in FIG. 5 (e). May be good.

It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

1 Steel-concrete synthetic structural material 2 Steel structural material 3 Concrete material 21 Steel plate 22 Stiffening material 22f Flange 22h Opening 22w Web 23 Partition plate 23a First partition plate 23b Second partition plate 23c Third partition plate 23h Openings 23s, 23t , 23u Gap 24 Stud Jibel

Claims (4)

A steel structural material containing a steel plate forming a steel layer and a stiffener arranged on the steel plate,
A concrete material that is cast so as to embed the stiffener and forms a concrete layer on the steel structural material is provided.
The stiffener is composed of a shaped steel with a web and a flange, and also includes a plurality of partition plates arranged along the longitudinal direction of the stiffener.
The plurality of partition plates extend to a position beyond the tip of the flange, and have a first partition plate having a predetermined width and a tip that serves as a starting point for causing a crack in the concrete layer, and the tip of the flange. Includes a second partition plate that extends to a position that does not exceed and has a width smaller than that of the first partition plate.
The first partition plate and the second partition plate are alternately arranged.
A steel-concrete synthetic structural material characterized by this. The steel-concrete synthetic structural material according to claim 1, wherein the plurality of partition plates are arranged so as to have a gap with respect to the web or the flange. The steel-concrete synthetic structural material according to claim 1, wherein the plurality of partition plates have openings. The steel-concrete synthetic structural material according to claim 1, wherein the stiffener has an opening formed in the flange.

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