Steel member, joint structure, composite structure, and construction method for composite structure

Abstract

In order to simplify vertical joint construction between steel frame members to shorten construction time and reduce the cost required for construction, this steel frame member is used in a composite structure comprising concrete and the steel frame member disposed inside the concrete, wherein an anchoring steel sheet embedded by the concrete is provided to at least one end of the steel frame member. The anchoring steel sheet is provided to the inner peripheral side or outer peripheral side of the steel frame member. A protrusion is formed on at least a portion of the surface of the steel frame member. In a composite structure comprising concrete and the steel frame member disposed inside the concrete, a joint structure connecting a first steel frame member and a second steel frame member in the axial direction of the composite structure is provided with a first anchoring steel sheet on an end of the first steel frame member, and at least one among the outer surface and inner surface of the second steel frame member is disposed along the first anchoring steel sheet.

Description

[Technical field]

[0001] The present invention relates to a steel frame member, a joint structure, a composite structure, and a method for constructing a composite structure. [Background technology]

[0002] A known composite column base structure is constructed with a precast outer frame member, a steel frame member placed in the precast outer frame member, and concrete poured in the precast outer frame member as its main members (see Non-Patent Document 1). Patent Document 1 describes a structure that uses a steel frame with protrusions as the steel frame member that constitutes such a composite column base structure, improving its unity with the concrete.

[0003] In the steel frame members described in Patent Document 1, when these steel frame members are joined vertically to extend them in the vertical direction, a joining method by on-site welding or a friction joining method using high-strength bolts (see Non-Patent Document 1) is used. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2004-204602 A [Non-patent literature]

[0005] [Non-Patent Document 1] Stripe H H-shaped steel for bridge piers Cat. No. D1J-504-05 (JFE Steel Corporation) Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the above-mentioned conventional techniques, all of the methods require long hours of manual work and a strong work scaffolding. This leads to an increase in construction time and high construction costs. Therefore, when constructing a composite column base structure using steel frame members, there has been a demand for a technique that can simplify the vertical joint construction between steel frame members, which has been carried out by on-site work such as welding and bolting, and shorten the construction period.

[0007] The present invention has been made in consideration of the above, and its object is to provide a steel member, a joint structure, a composite structure, and a construction method for a composite structure that can simplify the construction of vertical joints between steel members, thereby shortening construction time and reducing construction costs. [Means for solving the problem]

[0008] (1) In order to solve the above-mentioned problems and achieve the above-mentioned objects, a steel member according to one embodiment of the present invention is a steel member used in a composite structure comprising concrete and a steel member placed in the concrete, and a fixing steel plate embedded in the concrete is provided at at least one end.

[0009] (2) In the steel member of the present invention, in the invention (1) above, the anchoring steel plate is provided on the inner or outer surface of the steel member.

[0010] (3) In the steel frame member according to the present invention, in the invention (1) or (2) above, a protrusion is formed on at least a part of the surface of the steel frame member.

[0011] (4) A joint structure according to one embodiment of the present invention is a joint structure that connects a first steel member and a second steel member in the axial direction of a composite structure comprising concrete and a steel member placed in the concrete, wherein a first anchoring steel plate is provided at an end of the first steel member, and at least one of the outer surface and the inner surface of the second steel member is arranged along the first anchoring steel plate.

[0012] (5) A joint structure according to one embodiment of the present invention, in the above-mentioned (4), further comprises a second anchoring steel plate provided at an end of the second steel member at the connection portion between the second steel member and the first steel member.

[0013] (6) A composite structure according to one embodiment of the present invention is a composite structure comprising concrete and steel frame members placed in the concrete, in which a first steel frame member and a second steel frame member are connected by a joint structure according to the above-mentioned invention.

[0014] (7) A method of constructing a composite structure according to one aspect of the present invention is a method of constructing a composite structure comprising concrete and a plurality of steel frame members disposed in the concrete, comprising: a connecting step of connecting a second steel frame member on a trailing side to a first steel frame member on a leading side along an axial direction; and a pouring step of pouring the concrete around the steel frame members after connecting the steel frame members to be connected in the connecting step. The connecting step includes a first connecting step of positioning a first steel frame member having a first anchoring steel plate at its end so that the end at which the first anchoring steel plate is provided is the connecting side, and connecting a second steel frame member so as to fit into the first anchoring steel plate; and a second connecting step of positioning a second anchoring steel plate at its end to one end of the first steel frame member. The method includes any one of a second connecting step of positioning a second steel member having a wearing steel plate so that the end where the second anchoring steel plate is provided is the connection side, and connecting the second anchoring steel plate of the second steel member so that it fits into the first steel member, and a third connecting step of positioning a first steel member having a first anchoring steel plate provided at its end so that the end where the first anchoring steel plate is provided is the connection side, positioning a second steel member having a second anchoring steel plate provided at its end so that the end where the second anchoring steel plate is provided is the connection side, connecting the first anchoring steel plate to fit into the second steel member, and connecting the second anchoring steel plate to fit into the first steel member. Effect of the Invention

[0015] According to the present invention, construction time can be shortened and construction costs can be reduced. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a front view showing an example of a steel frame member according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view taken along line II-II of the steel frame member according to the first embodiment shown in FIG. [Diagram 3] FIG. 3 is a cross-sectional view and a plan view showing a hole portion of the anchoring steel plate according to the first embodiment of the present invention. [Figure 4] FIG. 4 is a cross-sectional view and a plan view showing a hole portion of the anchoring steel plate according to the first embodiment of the present invention. [Diagram 5] FIG. 5 is a perspective view showing an example of a steel frame member before an anchoring steel plate according to the first embodiment of the present invention is attached. [Figure 6] FIG. 6 is a front view showing a longitudinal joint structure of two steel frame members according to the first embodiment of the present invention. [Figure 7] FIG. 7 is a top view showing a composite structure according to the first embodiment. [Figure 8] FIG. 8 is a front view showing an example of a steel frame member according to the second embodiment of the present invention. [Figure 9] FIG. 9 is a cross-sectional view taken along line IX-IX of the steel frame member according to the second embodiment shown in FIG. [Figure 10] FIG. 10 is a front view showing a longitudinal joint structure of two steel frame members according to the second embodiment of the present invention. [Figure 11] FIG. 11 is a cross-sectional view taken along line XI-XI of the longitudinal joint structure of the steel frame members shown in FIG. [Figure 12] FIG. 12 is a front view showing an example of a steel frame member according to the third embodiment of the present invention. [Figure 13] FIG. 13 is a cross-sectional view taken along line XIII-XIII of the steel frame member shown in FIG. [Figure 14]FIG. 14 is a front view showing an example of a steel frame member according to the fourth embodiment of the present invention. [Figure 15] FIG. 15 is a front view showing a steel frame member and a longitudinal joint structure according to the fifth embodiment of the present invention. [Figure 16] FIG. 16 is a front view corresponding to FIG. 1 of a steel frame member showing a first modified example of the embodiment of the present invention. [Figure 17] FIG. 17 is a cross-sectional view taken along line XVII-XVII of the steel frame member shown in FIG. [Figure 18] FIG. 18 is a cross-sectional view corresponding to FIG. 2 of a steel frame member showing a second modified example of the embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In all the drawings of the following embodiments, the same or corresponding parts are denoted by the same reference numerals. Furthermore, the present invention is not limited to the embodiment described below.

[0018] (First embodiment) First, a steel frame member according to a first embodiment of the present invention will be described. In the first embodiment, a steel plate for anchoring, such as a perforated steel plate, is attached to the steel frame member in advance. The steel frame member according to this embodiment is used in a composite structure including concrete and a steel frame member disposed within the concrete.

[0019] FIG. 1 shows an example of a steel frame member 10 according to the first embodiment. FIG. 2 shows a cross-sectional view of the steel frame member 10 taken along line II-II shown in FIG. 1. As shown in FIGS. 1 and 2, an anchoring steel plate 13 is provided on the inner side of the steel frame member 10. Specifically, the steel frame member 10 according to the first embodiment is configured to have a web 11, a flange 12, and an anchoring steel plate 13. The flanges 12 are provided on both sides of the web 11. The anchoring steel plate 13, which is an anchoring member for fixing to concrete, is provided at an end of the steel frame member 10, i.e., at the end of the flange 12, and joined at a joint 14 on the inner side of the flange 12 of the steel frame member 10.

[0020] In this embodiment, the anchoring steel plate 13 is embedded in the concrete constituting the above-mentioned composite structure in which the steel frame member 10 is disposed. By embedding the anchoring steel plate 13 in the concrete, an anchoring function is exerted between the anchoring steel plate 13 and the concrete. Here, although details will be described later, an example of the composite structure is a composite structure 100, and an example of the concrete is a concrete 102.

[0021] The anchoring steel plates 13 are provided by joining, for example, four plates so as to protrude from the inner side of the flange 12. In the example shown in FIG. 1 and FIG. 2, the anchoring steel plates 13 are provided substantially parallel to the surface of the web 11, and preferably provided at positions symmetrical with respect to a plane along the surface of the web 11. The anchoring steel plates 13 may be provided line-symmetrical with respect to the web 11 or point-symmetrical with respect to the center of the web 11 on a plane perpendicular to the longitudinal direction (also called the axial direction) of the steel frame member 10 shown in FIG. 2. The number and positions of the anchoring steel plates 13 are not necessarily limited to these numbers and positions. In particular, the number of the anchoring steel plates 13 may be one or more. Even in this case, it is more preferable to provide more than one, particularly an even number, because the anchoring steel plates 13 can be provided at a more suitable position as described above.

[0022] The anchoring steel plate 13 is formed, for example, from a perforated steel plate whose longitudinal direction is approximately parallel to the longitudinal direction of the steel frame member 10. At least one hole 13a is formed in the anchoring steel plate 13, for example, five holes 13a are formed in one anchoring steel plate 13 in the example shown in Fig. 1. When the anchoring steel plate 13 is formed from a perforated steel plate, it is sufficient that at least one hole 13a is provided, and the number of holes 13a to be formed is not limited.

[0023] 3 and 4 show examples of holes 13a of the anchoring steel plate 13. Both of FIG. 3 and FIG. 4 are a cross-sectional view and a plan view showing the hole 13a of the anchoring steel plate 13. The anchoring steel plate 13 shown in FIG. 3 is a perforated steel dowel, and the holes 13a consisting of dowel holes are formed in a flat plate. The anchoring steel plate 13 shown in FIG. 4 is a perforated steel dowel, and the side portion 13aa of the hole 13a is raised by performing burring press processing on the steel plate. By raising the side portion 13aa, it is possible to improve the anchoring property with the concrete to be poured compared to the perforated steel dowel shown in FIG. 3. As the perforated steel dowel used for the anchoring steel plate 13, either of the anchoring steel plates 13 shown in FIG. 3 and FIG. 4 may be adopted.

[0024] FIG. 5 is a perspective view showing an example of a steel frame member before the fixing steel plate 13 is attached. As shown in FIG. 5, the surface of the flange 12 of the steel frame member 10 has protrusions 12a formed in stripes perpendicular to the longitudinal direction of the steel frame member 10, i.e., in a so-called horizontal stripe pattern. In this way, by providing the protrusions 12a on the surface of the flange 12, the fixing property of the steel frame member 10 to the concrete poured around the steel frame member 10 can be improved. As for the protrusions 12a, various shapes such as vertical stripe protrusions and checker ribs can be applied in addition to the horizontal stripe pattern shown in FIG. 5. In addition, the shape of the protrusions 12a on the surface of the steel frame member 10 can also be obtained with the same function as the protrusions 12a by further welding deformed reinforcing bars or steel pieces. In addition, the height of the protrusions 12a is preferably 2 mm or more in order to ensure fixing property with the surrounding concrete 102, and is preferably 3 mm or less from the viewpoint of formation. Furthermore, the position where the protrusion 12a is provided may be the outer surface of the steel frame member 10 made of H-shaped steel, i.e., the outer surface of the flange 12, as shown in Fig. 5, or the inner surface of the flange 12 or the surface of the web 11, and the protrusion 12a can be formed in various positions on the outer surface of the steel frame member 10 as long as it is a part that may come into contact with the concrete 102. Note that it is not limited to forming the protrusion 12a, and it is also possible not to provide it.

[0025] (Vertical joint structure of steel members) Next, a longitudinal joint structure as a joint structure of steel frame members configured as above will be described. Fig. 6 is a front view showing the longitudinal joint structure of two steel frame members according to the first embodiment. Fig. 6 corresponds to a connection step corresponding to the first connection step.

[0026] As shown in Fig. 6, of a pair of steel frame members 10, 10A that are joined vertically along the longitudinal direction (axial direction) of the steel frame member 10, an anchoring steel plate 13 as a first anchoring steel plate is joined only to an end of one of the steel frame members 10. In other words, of the pair of steel frame members 10, 10A, the anchoring steel plate 13 is joined at a joint 14 to an end of the steel frame member 10 as the first steel frame member on the side of the other steel frame member 10A as the second steel frame member. Conversely, the anchoring steel plate 13 is not provided at the end of the steel frame member 10 on the side of the steel frame member 10 as shown in Fig. 5.

[0027] When these steel members 10, 10A are joined vertically, the shapes of the web 11A and flange 12A of the lower end of the trailing steel member 10A are adjusted to match the shapes of the web 11 and flange 12 at the upper end of the leading steel member 10. After that, the web 11A and flange 12A are placed along the anchoring steel plate 13 and joined vertically to the upper ends of the web 11 and flange 12. Here, the steel members 10, 10A are connected so that the anchoring steel plate 13 is inserted between the flanges 12A of the steel member 10A. In this way, a vertical joint structure 5 is constructed at the connection portion of the steel members in the composite structure. Furthermore, a fixing steel plate 13 is joined to the upper end of the trailing steel member 10A, and this steel member 10A is regarded as the above-mentioned steel member 10. The connection step of vertically connecting a steel member having a lower end similar to that of steel member 10A on the upper layer is repeated the required number of times, so that the multiple steel members in the composite structure are each extended upward via the vertical joint structure 5.

[0028] It is also possible to reverse the leading side and the trailing side of the steel frame members 10 and 10A. In this case, the connection step corresponds to the second connection step. That is, the lower end of the trailing steel frame member 10 is arranged so that the shapes of the web 11 and the flange 12 match the shapes of the web 11A and the flange 12A at the upper end of the leading steel frame member 10A. Then, the fixing steel plate 13 of the steel frame member 10 is arranged along the upper end side of the web 11A and the flange 12A so that it can be inserted, and the fixing steel plate 13 is inserted between the flanges 12A. This constructs the longitudinal joint structure 5 of the steel frame members in the composite structure. Furthermore, the trailing steel frame member 10 is regarded as the steel frame member 10A, and the connection step of longitudinally connecting a steel frame member having a lower end to which the same fixing steel plate 13 as the steel frame member 10 is joined is repeated as many times as necessary, so that the multiple steel frame members in the composite structure are each extended upward via the longitudinal joint structure 5.

[0029] FIG. 7 is a top view showing a composite structure according to the first embodiment. As shown in FIG. 7, the composite structure 100 is composed of an outer frame member 101, concrete 102, and a plurality of steel frame members 10, 10A joined vertically. When constructing the composite structure 100, the vertical jointing of the steel frame members 10, 10A and the pouring of the concrete 102 can be repeatedly performed. That is, when assembling a plurality of steel frame members 10, 10A via the vertical joint structure 5, after all the steel frame members 10, 10A of the same story are assembled on a horizontal plane, the concrete 102 is poured around the steel frame members 10, 10A as a pouring step, so that the joined steel frame members 10, 10A are embedded in the concrete 102 together with the anchoring steel plate 13. After that, the steel frame members 10, 10A of the upper stories are joined vertically to extend the composite structure 100 upward. By repeatedly pouring these steel members 10, 10A and concrete 102, the composite structure 100 can be constructed. In this case, in the steel members 10, 10A embedded in the composite structure 100, the concrete 102 is connected to both sides of the anchoring steel plate 13 through holes 13a formed in the anchoring steel plate 13. Furthermore, since the flange 12A of the trailing steel member 10A is positioned to match the shape of the anchoring steel plate 13 of the leading steel member 10, the vertical joint structure 5 can be strengthened.

[0030] Furthermore, when the vertical joints of the steel members 10, 10A and the pouring of the concrete 102 are repeatedly performed, the process may be as follows. That is, first, the steel members 10, 10A of the same floor are assembled via a vertical joint structure. Next, after at least one floor of the steel members 10, 10A of the upper floors is assembled, a pouring step is performed in which the steel members 10, 10A are embedded in the concrete 102 together with the anchoring steel plates 13.

[0031] In the composite structure 100 thus constructed, the steel member 10 can be secured to the concrete 102 around it by the anchoring steel plate 13 joined to the end, here the upper end, of the steel member 10, so stress can be transmitted between the steel members 10 and 10A that are joined vertically. Furthermore, when a steel member 10 having a protrusion 12a as shown in FIG. 5 is used, the concrete 102 and the steel member 10 can be secured to be fixed in a more preferable state. That is, according to the steel member 10 constructed as above, an overlapping section can be formed between the anchoring section of the cast concrete 102 by the protrusion 12a formed on the flange 12 and the anchoring section of the perforated steel dowel by the anchoring steel plate 13. This allows stress to be transmitted between the leading steel member 10 and the trailing steel member 10A that are joined vertically, based on the principle of lap joints. This means that stress can be transmitted in a shorter section than when the steel member 10 does not have a protrusion 12a on its surface.

[0032] According to the first embodiment of the present invention described above, in a composite structure 100 composed of an outer frame member 101, concrete 102, and steel frame members 10, 10A, when performing a vertical joint between the steel frame members 10, 10A, one of the steel frame members 10 having an anchoring steel plate 13 attached to the end where the vertical joint is to be performed is used, and the other steel frame member 10A to be the subject of the vertical joint is arranged along the anchoring steel plate 13 to construct a vertical joint structure 5. This makes it possible to omit the process of connecting the steel frame members, which has conventionally been performed by on-site work such as welding and bolting, and therefore simplifies the construction of vertical joints between steel frame members and enables the construction period to be shortened.

[0033] Second Embodiment Next, a steel frame member according to a second embodiment of the present invention will be described. As with the steel frame member according to the first embodiment, the steel frame member according to the second embodiment is also used in a composite structure including concrete and a steel frame member placed in the concrete. FIG. 8 shows an example of a steel frame member according to the second embodiment. FIG. 9 is a cross-sectional view taken along line IX-IX of the steel frame member shown in FIG. 8.

[0034] As shown in Figs. 8 and 9, the steel member 20 according to the second embodiment is provided with an anchoring steel plate 23 on the outer surface side of the steel member 20, unlike the first embodiment. Specifically, in the second embodiment, the anchoring steel plate 23 is provided at the end of the steel member 20, i.e., the end of the flange 22, with the longitudinal direction substantially parallel to the longitudinal direction of the steel member 20, and joined at the joint 24 on the outer surface side of the flange 22. Although details will be described later, the anchoring steel plate 23 is provided at the end of the steel member 20, which is the connection portion with the steel member 10. For example, four anchoring steel plates 23 as second anchoring steel plates are joined to the outer surface side of the flange 22. In the example shown in Figs. 8 and 9, the anchoring steel plates 23 are provided substantially parallel to the surface of the web 21, and are preferably provided at positions symmetrical with respect to a plane along the surface of the web 21. The anchoring steel plates 23 may be arranged in a plane perpendicular to the longitudinal direction of the steel frame member 20 shown in FIG. 8 so as to be line-symmetrical with respect to the web 21 or point-symmetrical with respect to the center of the web 21. The positions and number of the anchoring steel plates 23 are not necessarily limited to these positions and numbers. In particular, the number of the anchoring steel plates 23 may be one or more, and it is more preferable to have more than one, and particularly an even number, since the anchoring steel plates 23 can be arranged in more suitable positions as described above. In this respect, it is the same as the steel frame member 10 in the first embodiment.

[0035] The configurations of the web 21, flange 22, anchoring steel plate 23, hole 23a, and joint 24 are similar to those of the web 11, flange 12, anchoring steel plate 13, hole 13a, and joint 14 in the first embodiment, respectively, so explanations are omitted.

[0036] (Vertical joint structure of steel members) Next, a longitudinal joint structure as a joint structure between the steel frame member according to the second embodiment configured as above and the steel frame member according to the first embodiment will be described. Fig. 10 is a front view showing the longitudinal joint structure of two steel frame members according to the second embodiment. Fig. 11 is a cross-sectional view taken along line XI-XI of the longitudinal joint structure of steel frame members shown in Fig. 10. In the longitudinal joint structure according to the second embodiment, an anchoring steel plate for longitudinal joint between steel frame members is attached to the rear end of the leading steel frame member and to the front end of the trailing steel frame member.

[0037] That is, as shown in Figures 10 and 11, for example, the steel member 10 according to the first embodiment is the leading side, and the steel member 20 according to the second embodiment is the trailing side. An anchoring steel plate 13 is joined to the upper end of the steel member 10, i.e., the side that is vertically joined to the steel member 20, and an anchoring steel plate 23 is joined to the lower end of the steel member 20, i.e., the side that is vertically joined to the steel member 10.

[0038] The connecting step of longitudinally connecting these steel members 10, 20 corresponds to the third connecting step. That is, the trailing steel member 20 is placed above the steel member 10 so that its web 21 and flange 22 match the shape of the anchoring steel plate 13 at the upper end of the leading steel member 10. That is, the steel member 20 is placed at a position where the anchoring steel plate 13 of the steel member 10 can be inserted between the flanges 22 of the steel member 20. Furthermore, the steel member 20 is placed above the steel member 10 so that the inner end of the anchoring steel plate 23 of the steel member 20 is located outside the flange 12 of the steel member 10. That is, the steel member 20 is placed by matching the shapes of the web 21 and the flange 22A so that the web 11 and two flanges 12 of the steel member 10 can be inserted between the anchoring steel plates 23 of the steel member 20. Thereafter, the web 21 and flange 22 are placed along the anchoring steel plates 13, 23, and the lower end of the steel member 20 is connected to the upper end of the steel member 10 to form a longitudinal joint. This completes the construction of the longitudinal joint structure 6 at the connection portion of the steel members in the composite structure.

[0039] Furthermore, a steel plate 13 for anchoring, having an upper end similar to that of the steel member 10, is joined to the upper end of the steel member 20 on the trailing side, and this steel member 20 is regarded as the above-mentioned steel member 10. By repeating the vertical joining of a steel member having a lower end similar to that of the steel member 20 on the upper layer as many times as necessary, the steel member in the composite structure is extended upward through the vertical joint structure. Similarly, a steel plate 23 for anchoring, similar to that of the lower end of the steel member 20, is joined to the upper end of the steel member 20 on the trailing side, and vertical joining can be performed in the same manner as described above with the steel member 20 as the leading side and the steel member 10 as the trailing side. In this case, the vertical joint structure 6 is in a state in which the top and bottom are inverted as shown in FIG. 10. Also, the steel plate 23 for anchoring is the first steel plate for anchoring, and the steel plate 13 for anchoring is the second steel plate for anchoring. In this way, the steel members in the composite structure are extended upward through the vertical joint structure by successively vertically joining the steel members 10, 20 so that the anchoring steel plates 13, 23 do not interfere with each other. Note that the anchoring steel plates 13, 23 at the ends of the steel members 10, 20 can be joined in various positions as long as they do not interfere with each other in the vertical joint.

[0040] In the second embodiment described above, the same effects as in the first embodiment can be obtained, and further, in the vertical joint structure 6, which is the joint structure, the anchoring steel plates 13, 23 joined to the ends of the two upper and lower steel members 10, 20 are joined in a mutually interlocking shape and are fixed to the surrounding concrete 102, so that an overlapping section can be formed, and therefore, in the manner of a lap joint, stress can be transmitted over a shorter section than in the first embodiment, and stress can be transmitted more efficiently.

[0041] (Third embodiment) Next, a steel frame member according to a third embodiment of the present invention will be described. The steel frame member according to the third embodiment is also used in a composite structure including concrete and a steel frame member disposed in the concrete. Fig. 12 shows an example of the steel frame member according to the third embodiment. Fig. 13 is a cross-sectional view taken along line XIII-XIII of the steel frame member shown in Fig. 12.

[0042] As shown in Fig. 12 and Fig. 13, in the third embodiment, the leading steel member 10 is the same as that in the first embodiment. In the trailing steel member 10B, the position where the anchoring steel plate 13B is provided is the inner side of the steel member 10, which is different from the steel member 10. That is, the anchoring steel plate 13B in the steel member 10B is provided on the inner side of the flange 12B, farther from the web 11B than the anchoring steel plate 13 in the steel member 10. In the example shown in Fig. 13, the anchoring steel plate 13B is joined at the joint 14B at the outer end of the flange 12B. The structure of the anchoring steel plate 13B is the same as that of the anchoring steel plate 13, and the structure of the hole 13Ba is the same as that of the hole 13a. The upper end of the steel member 10 and the lower end of the steel member 10B are vertically joined via the anchoring steel plates 13 and 13B, forming a vertical joint structure 7 as a connection part. The anchoring steel plates 13, 13B may be provided on the outer surface sides of the flanges 12, 12B, respectively.

[0043] In the third embodiment, in the vertical joint structure 7 in which the anchoring steel plates 13, 13B joined to the ends of the two upper and lower steel members 10, 10B are mutually nested like cages, the anchoring to the surrounding concrete 102 is ensured, so that stress can be transmitted over a shorter section than in the first embodiment, and therefore stress can be transmitted more efficiently.

[0044] (Fourth embodiment) Next, a steel member according to a fourth embodiment of the present invention will be described. The steel member according to the fourth embodiment is also used in a composite structure including concrete and a steel member disposed in the concrete. FIG. 14 shows an example of a steel member according to the fourth embodiment. As shown in FIG. 14, in a steel member 30 according to the fourth embodiment, the fixing steel plate 33 is made of, for example, a perforated steel plate dowel whose longitudinal direction is substantially parallel to the longitudinal direction of the steel member 30 and whose surface is substantially parallel to the surface of the web 31, and is joined at a joint 34 on the inner surface of the flange 32. In the fixing steel plate 33, the diameter of the hole 33a formed along the longitudinal direction of the steel member 30 is formed so as to become larger as it moves away from the end of the steel member 30. In other words, the fixing steel plate 33 is formed so that the hole 33a becomes smaller as it approaches the end of the steel member 30. In the example shown in FIG. 14, the diameters of the holes 331, 332, 333, 334, and 335 become larger in this order. The other configurations are the same as those of the first embodiment.

[0045] According to the fourth embodiment, it is possible to obtain the same effects as those of the first embodiment, and since the diameter of the hole 33a becomes smaller toward the joint 34 where the stress of the steel frame member 30 becomes severe, the stress resistance of the anchoring steel plate 33 can be improved. Furthermore, by making the hole 33a smaller, the length of the steel plate to be secured between the holes 331-335 can be reduced, so that the intervals between the holes 331-335 can be shortened, and the length of the anchoring steel plate 33 can be shortened. It is also possible to adopt the anchoring steel plate 33 according to the fourth embodiment as the anchoring steel plates 13, 13B according to the third embodiment (see FIG. 12).

[0046] Fifth embodiment Next, the fifth embodiment will be described. The steel member according to the fifth embodiment is also used in a composite structure including concrete and a steel member disposed in the concrete. FIG. 15 is a front view showing a steel member and a longitudinal joint structure according to the fifth embodiment. As shown in FIG. 15, the steel member according to the fifth embodiment has the anchoring steel plates 13 and 23 in the steel member 10 according to the first embodiment (see FIG. 1) and the steel member 20 according to the second embodiment (see FIG. 8) configured in the same manner as the anchoring steel plate 33 in the fourth embodiment.

[0047] 15, in a steel member 40 according to the fifth embodiment, an anchoring steel plate 43 is formed of, for example, a perforated steel dowel whose longitudinal direction is approximately parallel to the longitudinal direction of the steel member 40. The anchoring steel plate 43 is joined at a joint 44 on the inner surface of a flange 42 provided on both sides of a web 41 of the steel member 40.

[0048] In the anchoring steel plate 43, the diameter of the holes 43a formed along the longitudinal direction of the steel frame member 40 increases with increasing distance from the end of the steel frame member 40. In other words, the anchoring steel plate 43 is formed such that the holes 43a become smaller the closer they are to the end of the steel frame member 40. In the example shown in Fig. 15, the diameters of the holes 431, 432, 433, 434, and 435 increase in this order.

[0049] Furthermore, the upper end of the steel frame member 30 and the lower end of the steel frame member 40 are vertically joined via anchoring steel plates 33, 43 to form a vertical joint structure 8 as a connection portion. The steel frame member 30 and the steel frame member 40 may be upside down, i.e., the steel frame member 40 may be the leading side and the steel frame member 30 may be the trailing side. The other configurations are the same as those of the first and second embodiments.

[0050] According to the fifth embodiment, it is possible to obtain the same effects as the first and second embodiments, and also possible to obtain the same effects as the fourth embodiment by configuring the diameter of the hole 43a to become smaller toward the joint 44 where the stress level of the steel member 40 becomes severe.

[0051] (First Modification) Next, a first modified example of the above-mentioned embodiment will be described. The steel member according to the first modified example is also used in a composite structure including concrete and a steel member disposed in the concrete. Fig. 16 is a front view showing an example of the steel member according to the first modified example. Fig. 17 is a cross-sectional view taken along line XVII-XVII of the steel member shown in Fig. 16.

[0052] 16 and 17, in the first modified example, the basic steel frame member is made of a T-shaped steel. That is, in the steel frame member 50 according to the first modified example, a flange 52 is provided on one side of a plane perpendicular to the longitudinal direction of a web 51.

[0053] The anchoring steel plate 53 is configured in the same manner as the anchoring steel plate 13 in the first embodiment. That is, the anchoring steel plate 53 is joined to the joint 54 on the inner surface side of the flange 52 so that the longitudinal direction of the anchoring steel plate 53 is approximately parallel to the longitudinal direction of the steel frame member 50 and the surface of the anchoring steel plate 53 is approximately parallel to the surface of the web 51. That is, the anchoring steel plate 53 is provided on the inner surface side of the steel frame member 50. The holes 53a of the anchoring steel plate 53 are formed as shown in Figs. 3 and 4. The other configurations are the same as those of the first embodiment. In the first modified example, the same effects as those of the above-mentioned embodiment can be obtained.

[0054] (Second Modification) Next, a second modified example of the above-mentioned embodiment will be described. The steel member according to the second modified example is also used in a composite structure including concrete and a steel member disposed in the concrete. Figure 18 is a cross-sectional view corresponding to Figure 2 of the steel member according to the second modified example of the above-mentioned embodiment.

[0055] As shown in FIG. 18, the steel member 60 according to the second modified example is configured to have a web 61, a flange 62, and an anchoring steel plate 63. The flange 62 is provided on both sides of the web 61 in a direction perpendicular to the longitudinal direction. In the second modified example, the anchoring steel plate 63 is provided on the surface of the web 61 that is the inner surface side of the steel member 60. That is, the anchoring steel plate 63 is joined at the joints 64 on both sides of the web 61 at the end of the web 61 of the steel member 10. The position at which the anchoring steel plate 63 is provided may be only on one side of the web 61, and is not necessarily limited. In the second modified example, the same effects as those of the above-mentioned embodiment can be obtained.

[0056] Although the embodiment of the present invention has been specifically described above, the present invention is not limited to the above-mentioned embodiment, and various modifications based on the technical idea of ​​the present invention and embodiments combining each other can be adopted. For example, the configuration of the anchoring steel plate and the configuration and shape of the basic steel frame member given in the above-mentioned embodiment are merely examples, and a different device configuration may be used as necessary. In addition, the steel frame members 10, 10A, 20, 30, 40, 50, 60 may be used for either the leading side or the trailing side steel frame member as long as the anchoring steel plates 13, 13B, 23, 33, 43, 53, 63 do not interfere with each other.

[0057] In the above-described embodiment, a perforated steel plate is used as the anchoring steel plate, however, various steel plates or components can be used as the anchoring steel plate, such as a steel plate with headed studs or a ribbed steel plate, as long as the components can ensure anchoring function between the steel plate and the concrete.

[0058] In the above embodiment, H-shaped steel is used as the basic steel member, but other steel members may be used such as square steel pipes, circular steel pipes, so-called T-shaped steel with a T-shaped cross section, or a combination of H-shaped steel and T-shaped steel. In contrast to H-shaped steel and T-shaped steel, which have an open cross section in the cross section perpendicular to the longitudinal direction of the steel member used, square steel pipes and circular steel pipes have a closed cross section, so it is preferable to fill the inside of the steel pipes with concrete. In this case, it is also possible to appropriately add construction such as pouring concrete separately from the concrete of the composite structure 100.

[0059] Here, in the case of square steel pipes and circular steel pipes, which have a closed cross section perpendicular to the longitudinal direction of the steel member, it is often difficult to check the internal condition when concrete is poured inside the steel pipes. In this case, gaps that are not filled with concrete may occur, and the load transmission by the anchoring steel plate 13 may not function sufficiently. Therefore, in the case of shaped steels having a closed cross section perpendicular to the longitudinal direction of the steel member such as square steel pipes and circular steel pipes, it is preferable to take measures such as increasing the fluidity of the concrete. In this regard, in the case of shaped steels having an open cross section perpendicular to the longitudinal direction of the steel member such as H-shaped steel and T-shaped steel, such measures are not necessary, and are more preferable because the items of process management are reduced. [Industrial Applicability]

[0060] INDUSTRIAL APPLICABILITY As described above, the steel frame members, joint structures, composite structures, and composite structure construction methods of the present invention are suitable for application to vertical joint construction between steel frame members. [Explanation of symbols]

[0061] 5,6,7,8 Vertical joint structure 10, 10A, 10B, 20, 30, 40, 50, 60 Steel members 11,11A,11B,21,31,41,51,61 Web 12, 12A, 12B, 22, 22A, 32, 42, 52, 62 flanges 12a Protrusion 13, 13B, 23, 33, 43, 53, 63 Steel plate for anchoring 13a,13Ba,23a,33a,43a,53a,331,332,333,334,335,431,432,433,434,435 holes 13aa Edge 14,14B,24,34,44,54,64 Joint 100 composite structures 101 Outer frame member 102 Concrete

Claims

1. A steel member used in a composite structure including concrete and a steel member disposed in the concrete, A steel plate for anchoring, which is embedded in the concrete, is provided at least at one end, and the steel plate for anchoring is provided on the inner or outer surface side of the steel member having a protrusion formed on at least a part of its surface, and extends in the longitudinal direction from the end of the web of the steel member. Steel frame components.

2. The fixing steel plate is a perforated steel plate in which the sides of the holes are raised by performing a burring press process on the steel plate. The steel member according to claim 1.

3. The height of the protrusion is 2 mm or more and 3 mm or less. A steel member according to claim 1 or 2.

4. A joint structure for connecting a first steel member and a second steel member in an axial direction of a composite structure including concrete and a steel member disposed in the concrete, A first anchoring steel plate is provided at an end of the first steel member, and the first anchoring steel plate is provided on the inner surface or outer surface of the steel member having a protrusion formed on at least a part of its surface, and at least one of the outer surface and the inner surface of the second steel member is arranged along the first anchoring steel plate. Joint structure.

5. A second anchoring steel plate is provided at an end of the second steel member at a connection portion between the second steel member and the first steel member, the second anchoring steel plate extending from the end of the second steel member. The joint structure according to claim 4.

6. A composite structure comprising concrete and a steel member disposed in the concrete, The first steel frame member and the second steel frame member are connected by the joint structure according to claim 4 or 5. Composite structure.

7. A method for constructing a composite structure including concrete and a plurality of steel members disposed in the concrete, comprising the steps of: a connecting step of connecting a second steel member on a trailing side to a first steel member on a leading side along an axial direction; A pouring step of pouring the concrete around the steel frame members after connecting the steel frame members to be connected in the connecting step, The connecting step includes: A first steel frame member having a first anchoring steel plate extending longitudinally from a web at its end is arranged so that the end at which the first anchoring steel plate is provided is the connection side, and a second steel frame member is connected so as to fit into the first anchoring steel plate; and A second steel member having a second anchoring steel plate extending longitudinally from an end of a web is disposed on one end of the first steel member so that the end on which the second anchoring steel plate is disposed is the connection side, and the second anchoring steel plate of the second steel member is connected to the first steel member so as to fit into the first steel member; and a third connection step of positioning a first steel member having a first anchoring steel plate at its end such that the end where the first anchoring steel plate is provided is the connection side, and positioning a second steel member having a second anchoring steel plate at its end such that the end where the second anchoring steel plate is provided is the connection side, and connecting the first anchoring steel plate to fit into the second steel member and connecting the second anchoring steel plate to fit into the first steel member; The method includes any one of the steps Methods for constructing composite structures.

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