JP2019044395A - Steel concrete composite structural material - Google Patents

Abstract

To provide a steel concrete composite structural material capable of reducing the displacement between a steel material and a concrete material while suppressing deterioration of a concrete layer.SOLUTION: A steel concrete composite structural material 1 comprises: a steel structure 2 including a steel plate 21 forming a steel layer and a stiffener 22 disposed on the steel plate 21; and a concrete material 3 driven to embed the stiffener 22 and forming a concrete layer on the steel structural material 2. The stiffener 22 comprises a plurality of partition plates 23 consisting of a channel steel provided with a web 22w and a flange 22f and disposed along a longitudinal direction of the stiffener 22. The partition plates 23 comprise a first partition plate 23a extending to a position exceeding the tip of the flange 22f, and a second partition plate 23b extending to a position not exceeding the tip of the flange 22f.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a steel-concrete composite structural material, and more particularly to a steel-concrete composite structural material that can reduce the deviation between the steel material and the concrete material.

  The steel-concrete composite structural material is formed by integrating a steel material and a concrete material, and is excellent in durability, workability, and the like. Such steel-concrete composite structural materials are used in fields such as bridge decks, tunnel segments, steel structure wall materials, and the like.

  For example, as described in Patent Documents 1 to 3, a steel-concrete composite slab has ribs arranged on a bottom steel plate (generally, longitudinal ribs are referred to as vertical ribs and lateral ribs are referred to as lateral ribs). .) And a steel layer provided with stud gibbels, and a concrete layer placed on the steel layer. The “rib” is called “stiffener” because it is a member that supplements the rigidity of the floor slab, and the “stud gibber” is a member that reduces the deviation between the steel layer and the concrete layer. Sometimes called.

  If there is a gap between the steel and concrete, the function of the steel-concrete composite structure will be reduced or the deterioration will be accelerated, so we want to reduce the gap between the steel and the concrete. There is a need. In general, increasing the number of stoppers such as stud gibbles can reduce the deviation between the steel material and the concrete material, but there is a problem that the number of parts and work man-hours increase and the cost increases.

  In addition, as described in Patent Document 3, it has already been proposed to increase the binding force of concrete by providing longitudinal ribs on the lateral ribs and omit the stud gibber.

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

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

  The present invention was devised in view of such problems, and provides a steel-concrete composite structure material that can reduce the deviation between the steel material and the concrete material while suppressing deterioration of the concrete layer. Objective.

  According to the present invention, a steel structure material including a steel sheet forming a steel layer, and a stiffener disposed on the steel sheet, and the steel structure material placed on the steel structure material so as to embed the stiffener. A plurality of partition plates arranged along the longitudinal direction of the stiffener, and the stiffener is formed of a steel shape having a web and a flange. There is provided a steel-concrete composite structural material, wherein the plurality of partition plates include a partition plate extending to a position beyond the tip of the flange.

  The plurality of partition plates may include a partition plate extended to a position not exceeding the tip of the flange.

  The plurality of partition plates may include a partition plate disposed in a portion where the flange does not exist.

  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 openings.

  The stiffener may have an opening formed in the flange.

  According to the above-described steel-concrete composite structural material according to the present invention, by arranging a plurality of partition plates on the stiffener, the binding force of the concrete material by the steel structural material can be improved. Deviation from the material can be reduced. In addition, by extending the partition plate to a position beyond the tip of the flange, it is possible to partially move the starting point that causes a crack (crack) in the concrete layer and suppress the progress of the crack (crack) And the deterioration of the concrete layer can be suppressed.

It is a top view which shows the steel concrete composite structure material which concerns on one Embodiment of this invention. It is an enlarged view which shows the II section shown in FIG. 1, (a) is a top view, (b) is a BB sectional view taken on the line in FIG. 2 (a). It is a top view which shows the modification of a steel structure material, (a) is a 1st modification, (b) is a 2nd modification, (c) has shown the 3rd modification. It is sectional drawing which shows the modification of a steel structure material, (a) is a 4th modification, (b) is a 5th modification, (c) is a 6th modification, (d) is a 7th modification, ( e) shows an eighth modification, and (f) shows a ninth modification. It is sectional drawing which shows the modification of a steel structure material, (a) is a 10th modification, (b) is an 11th modification, (c) is a 12th modification, (d) is a 13th modification, e) shows a fourteenth modification.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 5E. Here, FIG. 1 is a plan view showing a steel concrete composite structure according to an embodiment of the present invention. 2A and 2B are enlarged views showing a part II shown in FIG. 1, wherein FIG. 2A is a plan view, and FIG. 2B is a cross-sectional view taken along line BB in FIG. For convenience of explanation, FIG. 1 shows a state in which a part of the concrete layer is cut away.

  The steel-concrete composite structural material 1 according to one embodiment of the present invention includes a steel plate 21 that forms a steel layer and a stiffener disposed on the steel plate 21 as shown in FIGS. 22 and a concrete material 3 that is placed so as to embed the stiffener 22 and forms a concrete layer on the steel structure 2, and the stiffener 22 includes a web 22 w and And a plurality of partition plates 23 arranged along the longitudinal direction of the stiffener 22, the partition plate 23 extending to a position beyond the tip of the flange 22 f. An extended first partition plate 23a and a second partition plate 23b extended to a position not exceeding the tip of the flange 22f are provided.

  The steel-concrete composite structural material 1 is used, for example, as a bridge floor slab, a tunnel segment, a wall material of a steel structure, or the like. For example, as shown in FIG. 1, the steel-concrete composite structural material 1 has a rectangular plate shape, and has a structure in which a steel layer and a concrete layer are vertically stacked. The steel layer is constituted by a steel plate 21 (for example, a bottom steel plate of a floor slab) that forms one surface of the steel-concrete composite structural material 1. The stiffener 22 is a reinforcing member that increases the rigidity of the steel plate 21 and is also a coupling member that increases the integrity with the concrete layer.

  For example, as shown in FIG. 1, the steel structural material 2 is provided with stiffeners 22 in a lattice shape. In general, the stiffener 22 arranged along the short direction (X-axis direction in the figure) is referred to as a transverse rib. In this embodiment, the partition plate 23 is arrange | positioned at the stiffener 22 which comprises a horizontal rib. Note that the steel structural member 2 may be provided with a stopper such as a stud dowel 24 arranged on the steel plate 21.

  The concrete material 3 is placed on the steel structure 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 stiffening material 22 and solidified when the concrete material 3 is solidified, the concrete material 3 is bonded to the steel structure material 2. In addition, in FIG.2 (b), the concrete material 3 is permeate | transmitted and the 1st partition plate 23a is shown in figure for convenience of explanation.

  The stiffener 22 is made of channel steel, for example, as shown in FIG. Therefore, the stiffener 22 has one web 22w and a pair of flanges 22f. A flange 22 f disposed at the lower end of the web 22 w 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 22 w and the flange 22 f 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 that is 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 structure material 2 is illustrated.

Further, as shown in FIG. 2A, the first partition plate 23a has a lateral width W1 larger than the width of the flange 22f, and the second partition plate 23b has a lateral width W2 substantially equal to the width of the flange 22f. doing. Therefore, as illustrated, the first partition plate 23a extends to a position beyond the tip of the flange 22f, and the second partition plate 23b extends so as not to exceed the tip of the flange 22f.
The lateral width W2 of the second partition plate 23b may be set smaller than the width of the flange 22f. Moreover, the protrusion amount of the 1st partition plate 23a is arbitrarily designed by conditions, such as the magnitude | size of the stiffener 22, the board thickness of the 1st partition plate 23a. Moreover, you may design the protrusion amount of the 1st partition plate 23a to a magnitude | size which changes with the position arrange | positioned.

  In this embodiment, as shown in FIG.1 and FIG.2 (a), the 1st partition plate 23a and the 2nd partition plate 23b are arrange | positioned alternately. However, the arrangement is not limited to this, and for example, a plurality of second divider plates 23b may be arranged between the pair of first divider plates 23a, or the pair of second divider plates 23b may be arranged. A plurality of first partition plates 23a may be arranged between them.

  Thus, by arranging a plurality of partition plates 23 (first partition plate 23 a and second partition plate 23 b) on the stiffener 22, the restraining 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 disposing the partition plate 23 on the stiffener 22, it is possible to omit the stud gibber 24 and the like and to reduce the cost of the steel-concrete composite structural material 1.

  By the way, when the stiffener 22 is embedded in the concrete layer, a crack (crack) is likely to occur in the concrete layer from the tip of the flange 22f. That is, the steel-concrete composite structural material 1 having the stiffener 22 is likely to crack (crack) along the line segment L1 shown in FIG. 2B, starting from the tip P1 of the flange 22f. Moreover, the crack (crack) produced from the front-end | tip P1 will advance in the X-axis direction of Fig.2 (a).

  In the present embodiment, the first partition plate 23a is extended to a position beyond the tip P1 of the flange 22f, so that the starting point for causing a crack (crack) in the concrete layer in the portion where the first partition plate 23a is disposed is first. It can be moved to the tip P2 of the partition plate 23a. Therefore, even when a crack (crack) generated from the tip P1 is about to propagate in the X-axis direction in the figure, the start position is shifted in the middle, thereby suppressing the progress of the crack (crack). And deterioration of the concrete layer can be suppressed.

  Here, the modification of the steel structural material 2 is demonstrated, referring FIG. 3 (a)-FIG.3 (c). FIG. 3 is a plan view showing a modified example of the steel structure material, in which (a) shows a first modified example, (b) shows a second modified example, and (c) shows a third modified example. In each figure, concrete material 3 is omitted and only steel structure material 2 is shown.

  In the first modified example shown in FIG. 3A, an opening 22 h is formed in the flange 22 f 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 the partition plate 23 and the stiffener 22 is formed, so that the opening 22h is formed. As a result, the fluidity of the concrete can be improved during concrete placement. Further, by forming the opening 22h in the flange 22f above the stiffener 22, it can be used as an air vent hole, and defects in the concrete layer can be reduced.

  In FIG. 3A, the opening 22h is formed at the base portion of the second partition plate 23b, but is not limited to this position. For example, the opening 22h may be formed at the base 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, the entire partition plate 23 is configured by the first partition plate 23a. Thus, even if it is a case where all the partition plates 23 are comprised in the 1st partition plate 23a extended to the position beyond the front-end | tip of the flange 22f, the effect similar to embodiment mentioned above can be acquired.

  In the third modified example 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 is not present. In the illustrated modification, the third partition plate 23c is disposed 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. Thus, even if it is a case where the 3rd partition plate 23c is arrange | positioned on the back surface to the web 22w of the stiffener 22, the restraining force of the concrete material 3 by the steel structure material 2 can be improved. Further, the third partition plate 23c may be disposed with the second partition plate 23b remaining, or the third partition plate 23c may be disposed on the back side of the first partition plate 23a.

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

  In the fourth modification shown in FIG. 4A, an opening 23 h is formed in the partition plate 23. The opening 23h 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 the opening 23h, it is possible to improve the fluidity of the concrete when placing concrete in the space surrounded by the partition plate 23 and the stiffener 22.

  In the fifth modified example 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 the gap 23s, it is possible to improve the fluidity of the concrete at the time of placing the concrete in the space surrounded by the partition plate 23 and the stiffener 22.

  In the sixth modified example 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 the gap 23t, it is possible to improve the fluidity of the concrete when placing concrete in the space surrounded by the partition plate 23 and the stiffener 22. Further, as illustrated, the height of the first partition plate 23a and the height of the second partition plate 23b may be formed in different sizes.

  In the seventh modified example 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 the gap 23u, it is possible to improve the fluidity of the concrete when placing concrete in the space surrounded by the partition plate 23 and the stiffener 22.

  In the eighth modification shown in FIG. 4E, the first partition plate 23a is formed in a triangular shape. For example, the triangular first partition plate 23a is fixed to the upper flange 22f. With this 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. The plate 23b is disposed 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 modified example of the steel structural member 2 will be described with reference to FIGS. 5 (a) to 5 (e). FIG. 5 is a cross-sectional view showing a modified example of the steel structure material, where (a) is a tenth modified example, (b) is an eleventh modified example, (c) is a twelfth modified example, and (d) is a thirteenth modified example. Modification (e) shows a fourteenth modification. In each figure, concrete material 3 is omitted and only steel structure material 2 is shown.

  In the tenth modification shown in FIG. 5A, the stiffener 22 is made of L-shaped steel (angle steel). In the case where the stiffener 22 is made of L-shaped steel, the flange 22f is arranged upward to fix the tip of the web 22w to the steel plate 21. And the partition plate 23 (the 1st partition plate 23a and the 2nd partition plate 23b) is arrange | positioned in the space enclosed by the steel plate 21 and the L-shaped steel. In addition, arrangement | positioning of the partition plate 23 is not limited to the structure shown in figure, What was shown to the modification mentioned above can be applied suitably.

  In the modification shown in FIGS. 5B and 5C, the stiffener 22 is made of H-section steel. When the stiffener 22 is made of H-shaped steel, the lower flange 22f is fixed to the steel plate 21 as in the above-described embodiment. And the partition plate 23 (the 1st partition plate 23a and the 2nd partition plate 23b) is arrange | positioned in the space enclosed by the web 22w and the flange 22f. In addition, arrangement | positioning of the partition plate 23 is not limited to the structure shown in figure, What was shown to the modification mentioned above can be applied suitably.

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

  In the modification shown in FIGS. 5D and 5E, the stiffener 22 is made of T-shaped steel. In the case where the stiffener 22 is made of T-shaped steel, the flange 22f is arranged upward to fix the tip of the web 22w to the steel plate 21. And the partition plate 23 (the 1st partition plate 23a and the 2nd partition plate 23b) is arrange | positioned in the space enclosed by the steel plate 21 and the T-shaped steel. In addition, arrangement | positioning of the partition plate 23 is not limited to the structure shown in figure, What was shown to the modification mentioned above can be applied suitably.

  Further, when the stiffener 22 is made of T-shaped steel, the partition plate 23 (the first partition plate 23a and the second partition plate 23b) is provided only on one side as in the thirteenth modification shown in FIG. 5 (d). Or a partition plate 23 (first partition plate 23a and second partition plate 23b) on both sides as in the fourteenth modification shown in FIG. 5 (e). Also good.

  The present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Steel concrete composite structural material 2 Steel structural material 3 Concrete material 21 Steel plate 22 Stiffening material 22f Flange 22h Opening part 22w Web 23 Partition plate 23a First partition plate 23b Second partition plate 23c Third partition plate 23h Openings 23s, 23t , 23u Clearance 24 Stud gibber

Claims (6)

A steel structure material comprising: a steel sheet forming a steel layer; and a stiffener disposed on the steel sheet;
A concrete material that is placed to embed the stiffener and forms a concrete layer on the steel structure material, and
The stiffener comprises a plurality of partition plates arranged along the longitudinal direction of the stiffener, and is formed of a shape steel having a web and a flange.
The plurality of partition plates include a partition plate extended to a position beyond the tip of the flange.
A steel-concrete composite structural material.   The steel-concrete composite structure material according to claim 1, wherein the plurality of partition plates include a partition plate extending to a position not exceeding a tip of the flange.   The steel-concrete composite structure material according to claim 1, wherein the plurality of partition plates include a partition plate disposed in a portion where the flange does not exist.   The steel-concrete composite structural material according to claim 1, wherein the plurality of partition plates are arranged so as to have a gap with respect to either the web or the flange.   The steel concrete composite structure according to claim 1, wherein the plurality of partition plates have openings. The steel concrete composite structure according to claim 1, wherein the stiffener has an opening formed in the flange.