Steel joint structure in steel concrete structure

Abstract

To provide a steel joint structure in a steel concrete structure having superior workability as compared with the conventional one.SOLUTION: There is provided a steel joint structure that joins a first main steel material and a second main steel material in a steel concrete structure, including: a first perforated steel plate gibber rigidly joined to the main steel material; a second perforated steel plate gibber rigidly joined to the second main steel material; and concrete arranged to cover at least the first perforated steel plate gibber and the second perforated steel plate gibber. The first perforated steel plate gibber and the second perforated steel plate gibber are arranged so as to face each other at intervals. The first perforated steel plate gibber and the second perforated steel plate gibber are integrally joined via the concrete in a state of being buried in the concrete.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a steel joint structure in a steel concrete structure. [Background technology]

[0002] 2. Description of the Related Art Conventionally, in a steel-concrete structure, when main steel members such as main girders are joined together in the extension direction, welding or bolting has generally been used. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4727091 [Patent Document 2] JP 2018-123644 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the reality was that welded and bolted joints between the main steel materials were not particularly easy to construct (work with).

[0005] The present invention has been made in consideration of the above-mentioned circumstances, and an object of the present invention is to provide a steel joint structure in a steel concrete structure which is easier to work than conventional methods. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention provides a steel joint structure for joining a first main steel material and a second main steel material in a steel concrete structure, comprising a first perforated steel plate dowel rigidly joined to the first main steel material, a second perforated steel plate dowel rigidly joined to the second main steel material, and concrete arranged to cover at least the first perforated steel plate dowel and the second perforated steel plate dowel, wherein the first perforated steel plate dowel and the second perforated steel plate dowel are arranged opposite each other with a gap between them, and the first perforated steel plate dowel and the second perforated steel plate dowel are joined together via the concrete in a state where they are embedded in the concrete.

[0007] According to the present invention, the first and second main steel members can be joined by embedding the first perforated steel plate dowel in the first main steel member and the second perforated steel plate dowel in the second main steel member together in concrete without directly welding or bolting the first and second main steel members together, which provides excellent workability. In particular, the present invention has the advantage that the first perforated steel plate dowel and the second perforated steel plate dowel are arranged opposite each other with a gap between them, and the concrete interposed between them can share the stress transmission between the first perforated steel plate dowel and the second perforated steel plate dowel, so that the first perforated steel plate dowel in the first main steel member and the second perforated steel plate dowel in the second main steel member can be joined without strict alignment between them when constructing a steel concrete structure. In other words, even if there is an error in the dimensional accuracy of the first main steel material and the second main steel material, or a construction error occurs in the alignment of the first main steel material and the second main steel material, these errors can be absorbed and the first main steel material and the second main steel material can be easily and reliably joined.

[0008] In addition, in the steel joint structure according to the present invention, the first main steel member and the second main steel member may be arranged parallel to each other, the first perforated steel plate dowel may be erected vertically from the first main steel member, and the second perforated steel plate dowel may be erected vertically from the second main steel member. By doing so, the first main steel member and the second main steel member can be easily connected to each other during construction of the steel concrete structure. By arranging them in parallel, the first perforated steel dowel and the second perforated steel dowel can be easily arranged opposite each other.

[0009] The steel frame joint structure according to the present invention may further include a rod-shaped or plate-shaped reinforcing steel material inserted between the dowel holes of the first perforated steel plate dowel and the dowel holes of the second perforated steel plate dowel, straddling each other. This makes it possible to suitably reinforce the concrete interposed between the first perforated steel plate dowel and the second perforated steel plate dowel in the joint portion between the first main steel material and the second main steel material. In other words, it is possible to increase the joint strength between the first main steel material and the second main steel material.

[0010] The steel joint structure according to the present invention comprises a first steel unit including a plurality of the first main steel members and a first base steel plate that holds the plurality of first main steel members parallel to each other with a gap therebetween, and a second steel unit including a plurality of the second main steel members and a second base steel plate that holds the plurality of second main steel members parallel to each other with a gap therebetween, and the plurality of first main steel members may be erected vertically from the first base steel plate, and the plurality of second main steel members may be erected vertically from the second base steel plate. In this way, by unitizing the plurality of first main steel members and the plurality of second main steel members, it is possible to improve workability when constructing a steel concrete structure.

[0011] Furthermore, in the steel joint structure according to the present invention, a restraining steel plate for restraining concrete at the joint between the first main steel member and the second main steel member may be provided so as to cover the upper part of the first perforated steel plate dowel and the second perforated steel plate dowel. This can increase the degree of restraint of concrete at the joint between the first main steel member and the second main steel member, making the concrete less susceptible to cracks and the like. As a result, the strength of the joint between the first main steel member and the second main steel member can be further increased.

[0012] In the steel frame joint structure according to the present invention, the first perforated steel plate dowel and the second perforated steel plate dowel may be disposed facing each other with a gap in between in the up-down direction.

[0013] In addition, the steel frame joint structure of the present invention may be such that the first main steel material and the second main steel material are joined in a state in which the main surfaces in the end regions of the first main steel material and the main surfaces in the end regions of the second main steel material are joined together.

[0014] In addition, in the steel joint structure of the present invention, the first main steel material and the second main steel material may be arranged so that the main surfaces at their respective end regions are arranged opposite each other with a horizontal gap between them, and the first perforated steel plate dowel and the second perforated steel plate dowel may be arranged opposite each other with a horizontal gap between them.

[0015] In addition, in the steel frame joint structure of the present invention, the first perforated steel plate dowel is rigidly connected to an end region of the first main steel material, and the second perforated steel plate dowel is rigidly connected to an end region of the second main steel material, and end plates may be rigidly connected to the end faces of the first main steel material and the second main steel material perpendicular to the longitudinal direction of each main steel material.

[0016] In addition, the steel frame joint structure of the present invention may have a restraining steel plate for restraining concrete provided at the joint portion of the first main steel material and the second main steel material so as to cover the upper and lower parts of the first perforated steel plate dowel and the second perforated steel plate dowel. Effect of the Invention

[0017] According to the present invention, it is possible to provide a steel joint structure in a steel concrete structure which is easier to construct than conventional structures. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is a schematic diagram showing a steel joint structure in a steel concrete structure according to the first embodiment. [Diagram 2] FIG. 2 is a top view of the first main steel material according to the first embodiment. [Diagram 3] FIG. 3 is a view taken along the arrow A in FIG. [Figure 4]FIG. 4 is a top view of the second main steel member according to the first embodiment. [Diagram 5] FIG. 5 is a view taken along the arrow B in FIG. [Figure 6] FIG. 6 is a diagram showing a state in which a joint end portion of a first main steel member and a joint end portion of a second main steel member according to the first embodiment are positioned at a predetermined joint position. [Figure 7] FIG. 7 is a diagram showing a state in which a joint end portion of a first main steel member and a joint end portion of a second main steel member according to the first embodiment are positioned at a predetermined joint position. [Figure 8] FIG. 8 is a schematic diagram showing a cross section of the steel concrete structure according to the first embodiment. [Figure 9] FIG. 9 is a schematic diagram showing a cross section of a steel concrete structure according to Modification 1 of the first embodiment. [Figure 10] FIG. 10 is a schematic diagram showing a cross section of a steel concrete structure according to Modification 2 of the first embodiment. [Figure 11] FIG. 11 is a top view of the first steel material unit according to the second embodiment. [Figure 12] FIG. 12 is a view taken along the arrow C in FIG. [Figure 13] FIG. 13 is a top view of the second steel material unit according to the second embodiment. [Figure 14] FIG. 14 is a view taken along the arrow D in FIG. [Figure 15] FIG. 15 is a diagram for explaining a joint method of the first steel material unit and the second steel material unit according to the second embodiment. [Figure 16] FIG. 16 is a diagram showing the first steel material unit and the second steel material unit in a state in which the dowel positioning has been completed. [Figure 17] FIG. 17 is a diagram showing a schematic cross section taken along line EE of FIG. [Figure 18] FIG. 18 is a schematic diagram showing a cross section along the width direction of the steel concrete structure according to the second embodiment. [Figure 19] FIG. 19 is a top view of a first steel material unit according to Modification 1 of the second embodiment. [Figure 20]FIG. 20 is a schematic diagram showing a cross section along the width direction of a steel concrete structure according to Modification 1 of Embodiment 2. As shown in FIG. [Figure 21] FIG. 21 is a diagram showing a steel joint structure of a steel concrete structure according to Modification 2 of the second embodiment. [Figure 22] FIG. 22 is a top view of the first steel material unit according to the third embodiment. [Diagram 23] FIG. 23 is a view seen from the direction of an arrow F in FIG. [Figure 24] FIG. 24 is a top view of the second steel material unit according to the third embodiment. [Diagram 25] FIG. 25 is a view seen from the direction of arrow G in FIG. [Figure 26] FIG. 26 is a diagram showing a part of the connection end side of the first steel material unit and the second steel material unit according to the third embodiment. [Figure 27] FIG. 27 is a diagram showing a state in which the first steel material unit and the second steel material unit according to the third embodiment are connected. [Figure 28] FIG. 28 is a schematic cross-sectional view taken along line HH of FIG. [Figure 29] FIG. 29 is a diagram showing a state in which pouring of concrete into the joint between the first main steel member and the second main steel member according to the third embodiment has been completed. [Diagram 30] FIG. 30 is a top view of the joint and its periphery after concrete has been poured in the third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Next, an embodiment of the present invention will be described with reference to the drawings. However, the embodiment described below is an example for carrying out the present invention, and the present invention is not limited to the aspect described below.

[0020] <Embodiment 1> Fig. 1 is a schematic diagram showing a steel joint structure in a steel concrete structure 1 according to embodiment 1. The steel concrete structure 1 is a composite (composite) structure including concrete 2 and a steel frame 3 as main structures. In Fig. 1, the concrete 2 is concrete after hardening. Fig. 1 also shows the internal structure of the steel concrete structure 1 when viewed from above.

[0021] The steel frame 3 in the steel concrete structure 1 has a plurality of main steel members 30 extending along the main direction of the steel concrete structure 1. The ends of the plurality of main steel members 30 in the longitudinal direction are jointed together. In FIG. 1, the ends of the first main steel member 30A and the second main steel member 30B are connected together. In the figure, reference numeral 300 denotes a joint portion where the first main steel member 30A and the second main steel member 30B are joined together. The first main steel member 30A and the second main steel member 30B are arranged parallel to each other with a gap in the width direction of the steel concrete structure 1. In this specification, in the planar direction of the steel concrete structure 1, the direction corresponding to the longitudinal direction of the main steel members 30 is defined as the main direction, and the direction perpendicular to the longitudinal direction of the main steel members 30 is defined as the width direction.

[0022] Fig. 2 is a top view of the first main steel material 30A according to embodiment 1. Fig. 3 is a view seen from the arrow A in Fig. 2. Fig. 4 is a top view of the second main steel material 30B according to embodiment 1. Fig. 5 is a view seen from the arrow B in Fig. 4. Figs. 2 to 5 show the longitudinal direction, width direction, and up-down direction of the main steel materials 30 (the first main steel material 30A and the second main steel material 30B). The width direction of the main steel materials 30 (the first main steel material 30A and the second main steel material 30B) can also be referred to as the plate thickness direction.

[0023] The first main steel material 30A is a structural steel plate having a flat plate shape whose outer shape is defined by a first main surface 301A, a second main surface 302A, an upper surface 303A, a lower surface 304A, a first end surface 305A, and a second end surface 306A.

[0024] A first perforated steel plate dowel 32A is rigidly joined to both ends of the first main steel material 30A by welding or the like. The first perforated steel plate dowel 32A has a rectangular planar shape defined by a pair of long sides and a pair of short sides, and one long side is connected along the first main surface 301A of the first main steel material 30A. The first perforated steel plate dowel 32A is vertically erected in the width direction from the first main surface 301A of the first main steel material 30A. As shown in FIG. 3, the first perforated steel plate dowel 32A is provided at a position (height) above the center in the up-down direction of the first main steel material 30A.

[0025] As shown in FIG. 2, the first perforated steel dowel 32A has a plurality of first dowel holes 320A drilled through the first perforated steel dowel 32A in the thickness direction. In the example shown in FIG. 2, a total of ten first dowel holes 320A are arranged vertically and horizontally in two rows in the short side direction and five rows in the long side direction of the first perforated steel dowel 32A. The first dowel holes 320A have a circular cross section. However, the number, position, size, arrangement pattern, and other aspects of the first dowel holes 320A formed in the first perforated steel dowel 32A are not particularly limited. Here, of the two rows of first dowel holes 320A in the first perforated steel dowel 32A, the row closer to the first main surface 301A of the first main steel material 30A may be called the "first dowel hole of the first row" and the row farther from the first dowel hole 320A may be called the "first dowel hole of the second row".

[0026] Next, the second main steel material 30B will be described. The second main steel material 30B has a first main surface 301B, a second main surface 302B, an upper surface 303B, a lower surface 304B, a first end surface 305B, and a second end surface 306B. It is a structural steel plate having a flat plate shape whose outer shape is defined by:

[0027] A second perforated steel plate dowel 32B is rigidly joined to both ends of the second main steel material 30B by welding or the like. The second perforated steel plate dowel 32B has a rectangular planar shape defined by a pair of long sides and a pair of short sides, and one long side is connected along the second main surface 302B of the second main steel material 30B. The second perforated steel plate dowel 32B is vertically erected in the width direction from the second main surface 302B of the second main steel material 30B. As shown in FIG. 5, the second perforated steel plate dowel 32B is provided at a position (height) lower than the center in the up-down direction of the second main steel material 30B.

[0028] As shown in FIG. 4, the second perforated steel dowel 32B has a plurality of second dowel holes 320B drilled through the second perforated steel dowel 32B in the thickness direction. In the example shown in FIG. 4, a total of ten second dowel holes 320B are arranged vertically and horizontally in two rows in the short side direction and five rows in the long side direction of the second perforated steel dowel 32B. The second dowel holes 320B have a circular cross section. However, the number, position, size, arrangement pattern, and other aspects of the second dowel holes 320B formed in the second perforated steel dowel 32B are not particularly limited. Here, of the two rows of second dowel holes 320B in the second perforated steel dowel 32B, the row closer to the second main surface 302B of the second main steel material 30B may be called the "first dowel hole of the first row" and the row farther from the second dowel hole 320B may be called the "first dowel hole of the second row". The first main steel material 30A and the second main steel material 30B described in Figures 2 to 5 have substantially the same structure, except for the height at which the first perforated steel plate dowel 32A and the second perforated steel plate dowel 32B are arranged.

[0029] Next, a method for joining the first main steel material 30A and the second main steel material 30B will be described. Figures 6 and 7 show a state in which the joint end of the first main steel material 30A and the joint end of the second main steel material 30B according to embodiment 1 are positioned at a predetermined joint position. Hereinafter, the state shown in Figures 6 and 7 will be referred to as a "dowel positioning completed state." Figure 6 shows the relative positional relationship in the planar direction of the first main steel material 30A and the second main steel material 30B. Figure 7 shows the relative positional relationship in the up-down direction of the first main steel material 30A and the second main steel material 30B.

[0030] In the state where the dowel positioning is completed as shown in Fig. 6 and Fig. 7, the first perforated steel dowel 32A in the first main steel material 30A and the second perforated steel dowel 32B in the second main steel material 30B are vertically overlapped in the planar direction. In the example shown in Fig. 6, the positions of the short sides of the first perforated steel dowel 32A and the second perforated steel dowel 32B are approximately aligned. In addition, the planar positions of the first dowel hole 320A in the first row of the first perforated steel dowel 32A and the second dowel hole 320B in the second row of the second perforated steel dowel 32B are approximately aligned, and the planar positions of the first dowel hole 320A in the second row of the first perforated steel dowel 32A and the second dowel hole 320B in the first row of the second perforated steel dowel 32B are approximately aligned. However, in this embodiment, the first perforated steel sheet dowel 32A and the second perforated steel sheet dowel 32B do not need to completely overlap in the planar direction, but may be arranged so that parts of them overlap in the planar direction. For example, the first perforated steel sheet dowel 32A and the second perforated steel sheet dowel 32B may partially overlap in the plane so that the planar positions of the first dowel hole 320A in the second row of the first perforated steel sheet dowel 32A and the second dowel hole 320B in the first row of the second perforated steel sheet dowel 32B generally match. However, the planar positions of the first dowel hole 320A and the second dowel hole 320B may be shifted.

[0031] As shown in Fig. 7, in the state where the dowel positioning is completed, the first perforated steel plate dowel 32A in the first main steel material 30A and the second perforated steel plate dowel 32B in the second main steel material 30B face each other and are arranged at a distance. In the example shown in Fig. 7, the first perforated steel plate dowel 32A is located above the second perforated steel plate dowel 32B. However, the positions in the up-down direction of the first perforated steel plate dowel 32A and the second perforated steel plate dowel 32B may differ from each other. The positional relationship may be reversed. In addition, in the state where the dowel positioning is completed, the first main steel material 30A and the second main steel material 30B are arranged in parallel with a predetermined distance between them, and the first main surface 301A of the first joint portion 31A and the second main surface 301B of the second joint portion 31B face each other. In addition, in the state where the dowel positioning is completed, the positions of the first main steel material 30A and the second main steel material 30B in the up-down direction are aligned with each other. That is, the heights of the respective upper surfaces 303A, 303B of the first main steel material 30A and the second main steel material 30B match, and the heights of the respective lower surfaces 304A, 304B match.

[0032] In addition, the reference symbol P1 shown in FIG. 7 is the distance between the opposing surfaces 322A, 322B of the first perforated steel dowel 32A and the second perforated steel dowel 32B that are arranged adjacent to each other in the dowel positioning completed state (hereinafter referred to as the "dowel distance dimension"). The steel plate separation dimension P1 is the dimension by which the opposing faces 322A, 322B are separated in the up-down direction of the first main steel member 30A and the second main steel member 30B which are arranged in parallel to each other.

[0033] 6 and 7, side formwork (not shown) is appropriately installed so as to surround the sides of the main steel material 30, and then concrete is poured. In this embodiment, the first perforated steel plate dowel 32A and the second perforated steel plate dowel 32B are joined together via the hardened concrete 2. Therefore, when pouring concrete, the concrete is poured so that at least the first perforated steel plate dowel 32A in the first main steel material 30A and the second perforated steel plate dowel 32B in the second main steel material 30B are embedded in the concrete.

[0034] Fig. 8 is a schematic diagram showing a cross section of the steel concrete structure 1 according to embodiment 1. The cross section of the steel concrete structure 1 is a cross section in a direction perpendicular to the main direction. Fig. 8 shows a cross-sectional structure corresponding to a joint 300 between the first main steel member 30A and the second main steel member 30B.

[0035] The steel joint structure of the steel concrete structure 1 in this embodiment comprises a first perforated steel plate dowel 32A rigidly joined to the joint end of the first main steel material 30A, a second perforated steel plate dowel 32B rigidly joined to the joint end of the second main steel material 30B, and concrete 2 arranged to cover the first perforated steel plate dowel 32A and the second perforated steel plate dowel 32B, wherein the first perforated steel plate dowel 32A and the second perforated steel plate dowel 32B are arranged opposite to each other with a gap between them, and the first perforated steel plate dowel 32A and the second perforated steel plate dowel 32B are joined together via the concrete 2 in a state where they are embedded in the concrete 2. Specifically, a first perforated steel plate dowel 32A and a second perforated steel plate dowel 32B are arranged facing each other with a gap in the vertical direction, and the perforated steel plate dowels 32A, 32B are integrally joined via the concrete 2. As a result, the first main steel material 30A and the second main steel material 30B are capable of mutual stress transmission by the concrete 2 that integrally covers the first perforated steel plate dowel 32A rigidly joined to the first main steel material 30A, the second perforated steel plate dowel 32B rigidly joined to the second main steel material 30B, and the first perforated steel plate dowel 32A and the second perforated steel plate dowel 32B and joins them. Therefore, according to the steel joint structure in this embodiment, the first main steel material 30A and the second main steel material 30B can be joined together without directly welding or bolting them together by arranging the first main steel material 30A and the second main steel material 30B at a distance from each other and embedding the first perforated steel plate dowel 32A of the first main steel material 30A and the second perforated steel plate dowel 32B of the second main steel material 30B together in concrete 2, thereby providing extremely excellent workability.

[0036] In particular, in this embodiment, the first perforated steel plate dowel 32A and the second perforated steel plate dowel 32B are arranged facing each other with a gap therebetween, and the stress transmission between the first perforated steel plate dowel 32A and the second perforated steel plate dowel 32B can be shared by the concrete 2 interposed between them. This has the advantage that they can be joined without strict alignment of the second perforated steel plate dowels 32B in the second main steel material 30B. In other words, even if there is an error in the dimensional accuracy of the first main steel material 30A and the second main steel material 30B, or an error in construction occurs in aligning the first main steel material 30A and the second main steel material 30B, these errors can be absorbed and the first main steel material 30A and the second main steel material 30B can be joined easily and reliably.

[0037] In addition, in the steel joint structure 1, the first main steel material 30A and the second main steel material 30B are arranged parallel to each other, the first perforated steel plate dowel 32A is erected vertically from the first main steel material 30A, and the second perforated steel plate dowel 32B is erected vertically from the second main steel material 30B. Therefore, by arranging the first main steel material 30A and the second main steel material 30B parallel to each other when constructing the steel concrete structure 1, the first perforated steel plate dowel 32A and the second perforated steel plate dowel 32B can be easily arranged opposite each other, resulting in excellent workability.

[0038] In this embodiment, the dowel spacing dimension P1 is set to a dimension that is 4 / 3 or more times the maximum aggregate dimension of the aggregate contained in the concrete 2. Furthermore, the hole diameters of the dowel holes 320A, 320B in the first perforated steel dowel 32A and the second perforated steel dowel 32B are set to a dimension that is 4 / 3 or more times the maximum aggregate dimension of the aggregate contained in the concrete 2. This improves the filling property when filling the joint portion 300 of the first main steel member 30A and the second main steel member 30B with concrete.

[0039] In the steel concrete structure 1, when multiple main steel members 30 are jointed in the longitudinal direction, the number of main steel members 30 to be joined is not particularly limited. When three or more main steel members 30 are jointed, the first main steel members 30A and the second main steel members 30B may be jointed alternately as many as necessary. The main steel members 30 (the first main steel member 30A or the second main steel member 30B) located at the end in the main direction of the steel concrete structure 1 may have the first perforated steel plate dowel 32A (the second perforated steel plate dowel 32B) only at one end. In addition, the steel concrete structure 1 may have multiple main steel members 30 arranged in the width direction. In addition, the cross-sectional shape of the multiple main steel members 30 constituting the steel frame 3 is not particularly limited. In the above embodiment, an example was described in which the main steel material 30 (first main steel material 30A, second main steel material 30B) was formed from flat steel plate, but it may also be formed from shaped steel whose cross section has an I-shape, H-shape, or other shape.

[0040] The steel concrete structure 1 can be used in various applications. For example, it can be used as a girder member, a deck slab, a tunnel lining, or a column member extending in the vertical direction.

[0041] <Variation 1> Fig. 9 is a diagram showing a schematic cross section of a steel concrete structure 1 according to a first modification of the first embodiment. In the first modification, the steel frame 3 in the steel concrete structure 1, i.e., the first main steel member 30A and the second main steel member 30B, have substantially the same structure as the first main steel member 30A and the second main steel member 30B described in Figs. 1 to 8. In the first modification, the first main steel member 30A and the second main steel member 30B are embedded in the concrete 2 with rod-shaped reinforcing steel bars (reinforcing iron material) 4A inserted across at least some of the dowel holes 320A, 320B in the first perforated steel plate dowel 32A in the first main steel member 30A and the second perforated steel plate dowel 32B in the second main steel member 30B. Instead of the rod-shaped reinforcing steel bars 4A, plate-shaped reinforcing iron materials may be arranged.

[0042] In the example shown in FIG. 9, the reinforcing bar 4 is inserted across the first dowel hole 320A of the first row in the first perforated steel dowel 32A and the second dowel hole 320B of the second row in the second perforated steel dowel 32B, and also across the first dowel hole 320A of the second row in the first perforated steel dowel 32A and the second dowel hole 320B of the first row in the second perforated steel dowel 32B. 9. However, the manner in which the reinforcing bars 4A are installed is not limited to the example shown in FIG.

[0043] 9 is provided with a hook-shaped locking portion 40 for preventing the reinforcing bar 4A from falling off the first perforated steel plate dowel 32A and the second perforated steel plate dowel 32B. This allows the reinforcing bar 4A to be hooked on the edge of the first dowel hole 320A in the first perforated steel plate dowel 32A located at the upper position out of the first perforated steel plate dowel 32A and the second perforated steel plate dowel 32B. After the dowel positioning completion state is reached, the reinforcing bar 4A may be fixed to the first perforated steel plate dowel 32A or the second perforated steel plate dowel 32B by welding the reinforcing bar 4A to the first perforated steel plate dowel 32A or the second perforated steel plate dowel 32B in a state in which the reinforcing bar 4A penetrates the upper and lower dowel holes 320A and 320B, or by using other fixing means before concrete is poured. In this modification, the hole diameter of each dowel hole 320A, 320B in the first perforated steel dowel 32A and the second perforated steel dowel 32B minus the hole diameter of the reinforcing steel bar 4A is set to be at least (4 / 3) times the maximum aggregate size of the aggregate contained in the concrete 2. This ensures the fillability of concrete into the joint portion 300 of the first main steel member 30A and the second main steel member 30B.

[0044] As described above, in this modified example, the reinforcing bars 4 are arranged across the upper and lower dowel holes 320A, 320B, so that the concrete 2 interposed between the first perforated steel plate dowel 32A and the second perforated steel plate dowel 32B at the joint portion 300 of the first main steel material 30A and the second main steel material 30B can be suitably reinforced.

[0045] <Variation 2> Fig. 10 is a schematic diagram showing a cross section of a steel concrete structure 1 according to a second modification of the first embodiment. In the second modification, a plurality of first perforated steel plate dowels 32A are provided at intervals along the vertical direction of the first main steel material 30A. A plurality of second perforated steel plate dowels 32B are provided at intervals along the vertical direction of the second main steel material 30B. In the example shown in Fig. 10, two first perforated steel plate dowels 32A are provided at intervals above and below the first main steel material 30A, and two second perforated steel plate dowels 32B are provided at intervals above and below the second main steel material 30B, along the vertical direction. In this modified example, three or more first perforated steel plate dowels 32A may be arranged along the vertical direction of the first main steel material 30A, and three or more second perforated steel plate dowels 32B may be arranged along the vertical direction of the second main steel material 30B. The number of first perforated steel plate dowels 32A and the number of second perforated steel plate dowels 32B may be different. A single first perforated steel plate dowel 32A may be arranged in the first main steel material 30A, and multiple second perforated steel plate dowels 32B may be arranged in the second main steel material 30B. Conversely, multiple first perforated steel plate dowels 32A may be arranged in the first main steel material 30A, and a single second perforated steel plate dowel 32B may be arranged in the second main steel material 30B.

[0046] As in this modified example, by arranging a plurality of perforated steel plate dowels in the first main steel material 30A and the second main steel material 30B, it is possible to further improve the fastening of the first main steel material 30A and the second main steel material 30B to the second joint portion 31B at the joint portion 300. Note that, also in this modified example, the dowel separation in which the opposing surfaces 322A, 322B of the first perforated steel plate dowel 32A and the second perforated steel plate dowel 32B that are arranged adjacent to each other and opposed to each other are separated from each other in the vertical direction is used. The dimension P1 is set to be at least (4 / 3) times the maximum aggregate dimension of the aggregate contained in the concrete 2. This ensures the filling of concrete into the joint portion 300 of the first main steel member 30A and the second main steel member 30B.

[0047] <Embodiment 2> Next, a steel concrete structure 1 according to a second embodiment will be described. In the steel concrete structure 1 according to the second embodiment, the steel frame 3 is configured to include a first steel material unit 20A shown in Figs. 11 and 12 and a second steel material unit 20B shown in Figs. 13 and 14. In the steel concrete structure 1 according to the second embodiment, the same components as those in the first embodiment are given the same reference symbols and detailed explanations are omitted. As will be described in detail later, the first steel material unit 20A is a steel material unit that includes a plurality of first main steel materials 30A described in the first embodiment and integrates these. The second steel material unit 20B is a steel material unit that includes a plurality of second main steel materials 30B described in the first embodiment and integrates these. In the steel frame 3 included in the steel concrete structure 1 according to the present embodiment, the first steel material unit 20A and the second steel material unit 20B are joined together.

[0048] Fig. 11 is a top view of a first steel material unit 20A according to embodiment 2. Fig. 12 is a view seen from an arrow C in Fig. 11. Fig. 13 is a top view of a second steel material unit 20B according to embodiment 2. Fig. 14 is a view seen from an arrow D in Fig. 13.

[0049] The first steel material unit 20A includes a plurality of first main steel materials 30A and a first base steel plate 40A that holds them. The second steel material unit 20B includes a plurality of second main steel materials 30B and a second base steel plate 40B that holds them. The first base steel plate 40A and the second base steel plate 40B are formed of flat steel plates having a rectangular planar shape. The first main steel material 30A and the second main steel material 30B have substantially the same structure as those described in the first embodiment.

[0050] In FIG. 11, reference numeral 401A denotes a side surface extending along the long side direction of the first base steel plate 40A, and reference numeral 402A denotes an end surface extending along the short side direction of the first base steel plate 40A. Reference numeral 403A denotes a surface of the first base steel plate 40A. In FIG. 12, reference numeral 401B denotes a side surface extending along the long side direction of the second base steel plate 40B, and reference numeral 402B denotes an end surface extending along the short side direction of the second base steel plate 40B. Reference numeral 403B denotes a surface of the second base steel plate 40B. Here, in the planar direction of the first base steel plate 40A and the second base steel plate 40B, the direction along the long side is called the "longitudinal direction" and the direction along the short side is called the "width direction". The "longitudinal direction" and "width direction" of the first base steel plate 40A and the second base steel plate 40B correspond to the "longitudinal direction" and "width direction" of the first steel material unit 20A and the second steel material unit 20B, respectively. The "vertical direction (height direction)" of the first steel material unit 20A and the second steel material unit 20B corresponds to the "vertical direction (height direction)" of the first main steel material 30A and the second main steel material 30B.

[0051] 11, three first main steel materials 30A are provided in parallel to each other along the longitudinal direction of the first base steel plate 40A in the first steel material unit 20A, and the first main steel materials 30A are arranged facing each other. Also, each of the first main steel materials 30A stands vertically from the surface 403A of the first base steel plate 40A.

[0052] Each of the first main steel materials 30A is erected at a constant interval along the width direction of the first base steel plate 40A. Hereinafter, the interval at which each of the first main steel materials 30A is spaced apart along the width direction of the first base steel plate 40A is referred to as the "first main steel material arrangement interval C1"). The length of each of the first main steel materials 30A in the longitudinal direction is equal to the long side dimension of the first base steel plate 40A, and the longitudinal end face of each of the first main steel materials 30A is aligned with the position of the end face 402A of the first base steel plate 40A. Also in this embodiment, the first perforated steel plate dowels 32A are rigidly joined to both ends of each of the first main steel materials 30A. The number of the first main steel materials 30A erected on the first base steel plate 40A is not particularly limited.

[0053] Next, the second steel material unit 20B will be described in detail. In the example shown in Fig. 13, three second main steel materials 30B are arranged alternately on a second base steel plate 40B along the longitudinal direction of the second base steel plate 40B. The second main steel members 30B are disposed parallel to each other, facing each other, and stand vertically from a surface 403B of a second base steel plate 40B.

[0054] Each second main steel material 30B is erected at a constant interval along the width direction of the second base steel plate 40B. Hereinafter, the interval at which each second main steel material 30B is spaced apart along the width direction of the second base steel plate 40B is referred to as the "second main steel material arrangement interval C2". Also in this embodiment, second perforated steel plate dowels 32B are formed at both ends of each second main steel material 30B. Herein, the length of each second main steel material 30B in the longitudinal direction is longer than the long side dimension of the second base steel plate 40B. As a result, the second perforated steel plate dowels 32B formed at both ends in the longitudinal direction of each second main steel material 30B are arranged in a state where they protrude outward from the end surface 402B of the second base steel plate 40B. The number of second main steel materials 30B erected on the second base steel plate 40B is not particularly limited. In this embodiment, the plate thicknesses of the first main steel material 30A and the second main steel material 30B are the same, and the first main steel material arrangement interval C1 and the second main steel material arrangement interval C2 are set to the same dimension.

[0055] Here, the first main surfaces 301A, 301B of the first main steel material 30A and the second main steel material 30B are surfaces that are oriented in the same direction in the width direction when the first steel material unit 20A and the second steel material unit 20B are joined, and the second main surfaces 302A, 302B of the first main steel material 30A and the second main steel material 30B are surfaces that are oriented in the same direction in the width direction when the first steel material unit 20A and the second steel material unit 20B are joined. Hereinafter, among the width directions of the first steel material unit 20A and the second steel material unit 20B, the direction in which the first main surfaces 301A, 301B of the first main steel material 30A and the second main steel material 30B are oriented is referred to as the "first width direction", and the opposite direction is referred to as the "second width direction". The second width direction corresponds to the direction in which the second main surfaces 302A, 302B of the first main steel material 30A and the second main steel material 30B are oriented, among the width directions of the first steel material unit 20A and the second steel material unit 20B.

[0056] Next, the joint structure of each of the first main steel materials 30A in the first steel material unit 20A and each of the second main steel materials 30B in the second steel material unit 20B will be described in detail.

[0057] 11, a first perforated steel plate dowel 32A is rigidly joined to the first main surface 301A at both ends of each first main steel material 30A by welding, etc. The first perforated steel plate dowel 32A stands vertically from the first main surface 301A of the first main steel material 30A in the first width direction, and as a result, the first perforated steel plate dowel 32A is held in a position parallel to the first base steel plate 40A.

[0058] Furthermore, the width dimension (short side dimension) along the short side direction of the first perforated steel plate dowel 32A is set to a dimension smaller than the first main steel material arrangement interval C1. Therefore, a first gap portion V1 is formed between the side surface 321A on the first width direction side of the first perforated steel plate dowel 32A and the second main surface 302A of the first main steel material 30A adjacent to the first perforated steel plate dowel 32A. In this embodiment, the relative size between the width dimension of the first perforated steel plate dowel 32A and the first main steel material arrangement interval C1 is adjusted so that the width of the first gap portion V1 is a dimension equal to or larger than the member thickness of the second main steel material 30B (preferably, a dimension larger than the member thickness of the second main steel material 30B).

[0059] 13, second perforated steel plate dowels 32B are rigidly joined by welding or the like to the second main surfaces 302B at both ends of each second main steel material 30B. The second perforated steel plate dowels 32B are vertically erected in the second width direction from the second main surfaces 302B of the second main steel material 30B, so that the second perforated steel plate dowels 32B are held in a parallel position to the second base steel plate 40B. Also, as shown in FIG. 13, the second perforated steel plate dowels 32B provided at both ends of each second main steel material 30B are rigidly joined to the second base steel plate 40B. 402B in the longitudinal direction.

[0060] Furthermore, the width dimension (short side dimension) along the short side direction of the second perforated steel plate dowel 32B is set to a dimension smaller than the second main steel material arrangement interval C2. Therefore, a second gap portion V2 is formed between the side surface 321B on the second width direction side of the second perforated steel plate dowel 32B and the first main surface 301B of the second main steel material 30B adjacent to the second perforated steel plate dowel 32B. In this embodiment, the relative size between the width dimension of the second perforated steel plate dowel 32B and the second main steel material arrangement interval C2 is adjusted so that the width of the second gap portion V2 is a dimension equal to or larger than the member thickness of the first main steel material 30A (preferably, a dimension larger than the member thickness of the first main steel material 30A).

[0061] Next, a method for joining the first steel material unit 20A and the second steel material unit 20B according to the second embodiment will be described. Figs. 15 to 17 are diagrams for explaining a method for joining the first steel material unit 20A and the second steel material unit 20B. As shown in Fig. 15, the first steel material unit 20A and the second steel material unit 20B to be joined to each other are aligned in orientation and height so that the end faces 402A, 402B on the connection end side face each other. The connection end here refers to the end that is connected to the other of the longitudinal ends of the first steel material unit 20A and the second steel material unit 20B. Note that Fig. 15 shows a part of the connection end side of the first steel material unit 20A and the second steel material unit 20B.

[0062] In this embodiment, the first steel material unit 20A and the second steel material unit 20B are moved closer to each other from the state shown in Fig. 15, and are shifted to the dowel positioning completion state shown in Fig. 16. Fig. 17 is a diagram showing a schematic cross section taken along the line EE in Fig. 16.

[0063] As described above, the second perforated steel plate dowel 32B of each second main steel material 30B protrudes outward from the end face 402B in the longitudinal direction of the second base steel plate 40B. That is, the end face 402B of the second base steel plate 40B is disposed at a position retreated further inward than the second perforated steel plate dowel 32B of each second main steel material 30B. Also, the first perforated steel plate dowel 32A of the first main steel material 30A is disposed at a position above the center in the height direction of the first main steel material 30A, and the second perforated steel plate dowel 32B of the second main steel material 30B is disposed at a position below the center in the height direction of the second main steel material 30B. By adopting the above structure, the second perforated steel plate dowel 32B in each second main steel material 30B can be inserted into the joint end region of the first steel material unit 20A without interference between the end faces 402A, 402B on the connection end side of the first steel material unit 20A and the second steel material unit 20B, and between the first perforated steel plate dowel 32A and the second perforated steel plate dowel 32B.

[0064] 17, the dowel positioning completion state can be achieved by positioning the first perforated steel sheet dowel 32A in each first main steel material 30A and the second perforated steel sheet dowel 32B in each second main steel material 30B at a position where they overlap vertically in a plane. Note that in the dowel positioning completion state, it is sufficient that a portion of the first perforated steel sheet dowel 32A and the second perforated steel sheet dowel 32B overlap with each other in a plane.

[0065] In the example shown in Fig. 16, in the state where the dowel positioning is completed, the positions of the short sides of the first perforated steel dowel 32A and the second perforated steel dowel 32B are approximately aligned, and the planar positions of the first dowel hole 320A in the second row of the first perforated steel dowel 32A and the second dowel hole 320B in the second perforated steel dowel 32B are approximately aligned. Also, as shown in Fig. 17, in the state where the dowel positioning is completed, the first perforated steel dowel 32A in the first main steel material 30A and the second perforated steel dowel 32B in the second main steel material 30B are arranged opposite to each other with a gap therebetween. In the example shown in Fig. 17, the first perforated steel dowel 32A is located above the second perforated steel dowel 32B.

[0066] Furthermore, in this embodiment, the first main steel material 30A and the second main steel material 30B have the same member thickness, and the first main steel material arrangement interval C1 and the second main steel material arrangement interval C2 are equal. Therefore, when the first perforated steel plate dowel 32A and the second perforated steel plate dowel 32B are aligned so as to face each other, the first main surface 301B in the end region of the second main steel material 30B can be appropriately guided while being aligned with the second main surface 302A in the end region of the first main steel material 30A. This makes it possible to easily align the first perforated steel plate dowel 32A and the second perforated steel plate dowel 32B, and to move to the dowel positioning completion state in a shorter time.

[0067] In this embodiment, when joining three or more steel units, the required number of first steel units 20A and second steel units 20B are alternately connected in series using the procedure described in Figures 15 to 17, and the first perforated steel sheet dowel 32A and the second perforated steel sheet dowel 32B are aligned so that the dowel positioning completion state shown in Figures 16 and 17 is achieved.

[0068] Also in this embodiment, after completing the positioning of the dowels as described in Figures 16 and 17, side formwork (not shown) is appropriately installed to surround the sides of the steel units, and then concrete is poured. Figure 18 is a schematic diagram showing a cross section along the width direction of the steel concrete structure 1 according to embodiment 2. Here, the width direction of the steel concrete structure 1 can also be said to be the force distribution direction.

[0069] In this embodiment as well, in order to integrally join the first perforated steel plate dowel 32A in the first main steel material 30A and the second perforated steel plate dowel 32B in the second main steel material 30B via the hardened concrete 2, the concrete is poured so that at least the first perforated steel plate dowel 32A and the second perforated steel plate dowel 32B are embedded in the concrete. In the example shown in FIG. 18, the first steel material unit 20A and the second steel material unit 20B are each formed of a first steel material unit 20A and a second steel material unit 20B. The surfaces 403A, 40B of the base steel plates 40A, 40B are fixed to each other so that the surfaces 403A, 40B are embedded in the concrete. Concrete is poured onto the first steel unit 20A and the second steel unit 20B to construct the steel concrete structure 1. Of course, in the first steel concrete structure 1, the base steel plates 40A, 40B of the first steel unit 20A and the second steel unit 20B may be buried in the concrete 2.

[0070] As shown in Fig. 18, in the steel-concrete structure 1 according to the second embodiment, similarly to the first embodiment, the first perforated steel plate dowel 32A and the second perforated steel plate dowel 32B are arranged facing each other with a gap therebetween, and the first perforated steel plate dowel 32A and the second perforated steel plate dowel 32B are joined together via the concrete 2 in a state where they are embedded in the concrete 2. As a result, the first main steel member 30A and the second main steel member 30B can transmit stress to each other through the concrete 2 that integrally covers the first perforated steel plate dowel 32A rigidly joined to the end of the first main steel member 30A, the second perforated steel plate dowel 32B rigidly joined to the end of the second main steel member 30B, and the first perforated steel plate dowel 32A and the second perforated steel plate dowel 32B and joins them. In this embodiment, too, the first steel units 20A and the second steel units 20B are joined alternately in the main direction of the steel concrete structure 1, and the first main steel members 30A and the second main steel members 30B extend along the main direction of the steel concrete structure 1.

[0071] Furthermore, the steel joint structure of the steel concrete structure 1 according to this embodiment includes a first steel unit 20A including a plurality of first main steel members 30A and a first base steel plate 40A that holds the first main steel members 30A parallel to each other with a gap therebetween, and a second steel unit 20B including a plurality of second main steel members 30B and a second base steel plate 40B that holds the second main steel members 30B parallel to each other with a gap therebetween, and the plurality of first main steel members 30A are vertically erected from the first base steel plate 40A and the plurality of second main steel members 30B are vertically erected from the first base steel plate 40A. A structure in which the second main steel material 30B is vertically erected from the second base steel plate 40B is adopted. In the example shown in FIG. 18, the first steel material units 20A and the second steel material units 20B are joined together along the width direction (force distribution direction) of the steel concrete structure 1 by an appropriate joining method such as welding or bolt joining. The reference symbol BL shown in FIG. 18 indicates the joining positions where the first steel material units 20A and the second steel material units 20B are joined together in the width direction of the steel concrete structure 1. As described above, according to the steel joint structure of the steel concrete structure 1 in this embodiment, the first steel material unit 20A in which a plurality of first main steel materials 30A are unitized and the second steel material unit 20B in which a plurality of second main steel materials 30B are unitized are provided, so that the workability when constructing the steel concrete structure 1 can be further improved.

[0072] <Variation 1> Next, a first modified example of the steel concrete structure 1 according to the second embodiment will be described. FIG. 19 is a top view of the first steel unit 20A according to the first modified example of the second embodiment. The first steel unit 20A according to this modified example has constraining steel plates 5 installed at both ends. The constraining steel plates 5 are members for constraining the concrete 2 at the joints 300 of the first main steel members 30A and the second main steel members 30B in the steel concrete structure 1. In this modified example, the constraining steel plates 5 have a rectangular planar shape, and are joined by being welded to the upper surfaces 303A of the first main steel members 30A. However, the joining method of the constraining steel plates 5 to the first steel unit 20A is not particularly limited. The first steel unit 20A according to the first modified example has the same structure as that described in FIG. 11 and FIG. 12, except that it has the constraining steel plates 5.

[0073] The length dimension of the constraining steel plate 5 along the longitudinal direction of the first steel unit 20A (extension direction of the first main steel material 30A) is approximately equal to the long side dimension of the first perforated steel plate dowel 32A, and the constraining steel plate 5 covers the upper part of the first perforated steel plate dowel 32A. The width dimension of the constraining steel plate 5 perpendicular to the longitudinal direction is equal to the width dimension of the first steel unit 20A. The constraining steel plate 5 is formed with an opening 50 having a circular cross section penetrating the constraining steel plate 5 in the member thickness direction. As shown in FIG. 19, the opening 50 in the constraining steel plate 5 is disposed at a position corresponding to each of the first dowel holes 320A in the second row of the first perforated steel plate dowel 32A. The shape, size, position, number, range, etc. of the opening 50 in the constraining steel plate 5 can be changed. In the steel concrete structure 1 in the first modification example, the steel frame 3 is also configured to include the first steel unit 20A and the second steel unit 20B. The second steel material unit 20B has the same structure as that of the second embodiment, as explained in FIG. 13 and FIG.

[0074] Fig. 20 is a schematic diagram showing a cross section along the width direction (force distribution direction) of the steel concrete structure 1 according to the first modification of the second embodiment. Reference numeral 300 shown in Fig. 20 indicates a joint portion between the first main steel member 30A and the second main steel member 30B. The joint portion between the first main steel member 30A and the second main steel member 30B is a joint region formed by integrally joining the first perforated steel plate dowel 32A in the first main steel member 30A and the second perforated steel plate dowel 32B in the second main steel member 30B with the concrete 2A around them. As shown in Fig. 20, the joint portion 300 between the first main steel member 30A and the second main steel member 30B is positioned in a region surrounded by the joint end portions of the first main steel member 30A and the second main steel member 30B, the end region of the first base steel plate 40A, and the restraining steel plate 5.

[0075] According to the steel joint structure of the steel concrete structure 1 according to the first modified example of the second embodiment, the constraining steel plate 5 is arranged on the upper part of the joint 300 of the first main steel member 30A and the second main steel member 30B as described above. Therefore, the concrete in the joint 300 (indicated by reference symbol 2A in FIG. 20) can be constrained not only by the first main steel member 30A, the second main steel member 30B, and the first base steel plate 40A, but also by the constraining steel plate 5. In other words, the concrete 2A in the joint 300 can be By constraining the concrete 2A from all four sides, the degree of constraint can be further increased. As a result, cracks are less likely to occur in the concrete 2A at the joint 300, and the strength of the joint 300 can be further increased. In addition, because the constraining steel plate 5 has openings 50, the filling of the concrete 2A into the joint 300 of the first main steel member 30A and the second main steel member 30B is improved when the steel concrete structure 1 is constructed.

[0076] In this modification, the constraining steel plate 5 is welded to the upper surface 303A of each of the first main steel materials 30A in the first steel material unit 20A, but the constraining steel plate 5 may be joined only to some of the first main steel materials 30A. Also, in this modification, an example has been described in which the constraining steel plate 5 is joined to the first steel material unit 20A, but the constraining steel plate 5 may be provided in an end region of the second steel material unit 20B. In this case, the constraining steel plate 5 may be extended along the width direction of the second steel material unit 20B and joined so as to straddle between the upper surfaces 303B of the second main steel materials 30B. Furthermore, instead of joining the constraining steel plate 5 to the first steel material unit 20A and the second steel material unit 20B in advance as in the above embodiment, the constraining steel plate 5 may be installed at the joint portion 300 of the first main steel material 30A and the second main steel material 30B after the first steel material unit 20A and the second steel material unit 20B have been brought into a dowel positioning completed state. Furthermore, the opening 50 formed in the constraining steel plate 5 may be a slit extending from one end to the other end in the longitudinal direction of the constraining steel plate 5.

[0077] <Variation 2> Next, a second modification of the second embodiment will be described. Fig. 21 is a diagram showing a steel joint structure of a steel concrete structure 1 according to the second modification of the second embodiment. The steel joint structure according to the second modification shown in Fig. 21 is the same as the first modification described in Fig. 20, except that the reinforcing bars described in Fig. 9 are installed in the joint portion 300 of the first main steel material 30A and the second main steel material 30B.

[0078] In this modification, the reinforcing bar 4A described in Fig. 9 is installed in a state in which it is inserted across at least some of the dowel holes 320A, 320B in the first perforated steel dowel 32A in the first main steel material 30A and the second perforated steel dowel 32B in the second main steel material 30B, and is embedded in the concrete 2A at the joint portion 300. In the example shown in Fig. 21, the reinforcing bar 4A is embedded in the concrete 2A in a state in which it straddles the first dowel hole 320A in the second row of the first perforated steel dowel 32A and the second dowel hole 320B in the second perforated steel dowel 32B, penetrating them.

[0079] Furthermore, as shown in FIG. 21, reinforcing bars 4B and 4C are arranged in the first dowel hole 320A of the first row of the first perforated steel plate dowel 32A and the second dowel hole 320B of the first row of the second perforated steel plate dowel 32B, respectively. The reinforcing bars 4B and 4C are shorter than the reinforcing bar 4A. The reinforcing bar 4B is embedded in the concrete 2A in a state in which it penetrates only the first dowel hole 320A of the first row of the first perforated steel plate dowel 32A. The reinforcing bar 4C is embedded in the concrete 2A in a state in which it penetrates only the second dowel hole 320B of the first row of the second perforated steel plate dowel 32B. In this modified example, the reinforcing bars 4A to 4C may also have locking portions 40 (see FIG. 9) formed at the ends thereof, and the locking portions 40 may be locked to the edges of the dowel holes.

[0080] Here, the opening 50 in the restraining steel plate 5 can also be used as a work opening for inserting the reinforcing bar 4A into the back side of the restraining steel plate 5 when inserting the reinforcing bar 4A into the first dowel hole 320A and the second dowel hole 320B during construction of the steel concrete structure 1, thereby improving workability.

[0081] <Embodiment 3> Next, a third embodiment will be described. In the above-described embodiments and their modifications, In the above description, the first perforated steel plate dowel 32A and the second perforated steel plate dowel 32B are arranged facing each other with a gap in the vertical direction in the end regions (joint regions) of the first main steel material 30A and the second main steel material 30B, but in the third embodiment, the first perforated steel plate dowel and the second perforated steel plate dowel rigidly joined to the end regions of the first main steel material and the second main steel material, respectively, are arranged facing each other with a gap in the horizontal direction. In the following, the same reference symbols are used for members common to the first and second embodiments described above, and detailed descriptions thereof will be omitted.

[0082] Fig. 22 is a top view of a first steel material unit 20C according to embodiment 3. Fig. 23 is a view seen from an arrow F in Fig. 22. Fig. 24 is a top view of a second steel material unit 20D according to embodiment 3. Fig. 25 is a view seen from an arrow G in Fig. 24.

[0083] The first steel material unit 20C includes a plurality of first main steel materials 30C and a first base steel plate 40A that holds them. The second steel material unit 20D includes a plurality of second main steel materials 30D and a second base steel plate 40B that holds them. The first base steel plate 40A and the second base steel plate 40B are as described in the second embodiment, and the "longitudinal direction" and "width direction" of the first base steel plate 40A and the second base steel plate 40B correspond to the "longitudinal direction" and "width direction" of the first steel material unit 20C and the second steel material unit 20D, respectively. The "vertical direction (height direction)" of the first steel material unit 20C and the second steel material unit 20D corresponds to the "vertical direction (height direction)" of the first main steel material 30C and the second main steel material 30D.

[0084] As shown in Fig. 22 and Fig. 23, three first main steel materials 30C are provided in parallel to each other along the longitudinal direction of the first base steel plate 40A in the first steel material unit 20C, and the first main steel materials 30C are arranged facing each other. The first main steel material 30C is a structural steel plate having a flat plate shape whose outer shape is defined by a first main surface 301A, a second main surface 302A, an upper surface 303A, a lower surface 304A, a first end surface 305A, and a second end surface 306A. Each first main steel material 30C is provided vertically from the surface 403A of the first base steel plate 40A, and is provided at regular intervals along the width direction of the first base steel plate 40A. Here, the longitudinal length of each first main steel material 30C is equal to the long side dimension of the first base steel plate 40A, and the longitudinal end face of each first main steel material 30C is aligned with the position of the end face 402A of the first base steel plate 40A. Also in this embodiment, first perforated steel plate dowels 32C are rigidly joined to both ends of each first main steel material 30C. Also, the number, intervals, dimensions, etc. of the first main steel materials 30C erected on the first base steel plate 40A are not particularly limited.

[0085] A pair of first perforated steel plate dowels 32C are rigidly joined to each of the end regions (joint regions) of each first main steel material 30C by welding or the like. One of the pair of first perforated steel plate dowels 32C stands upright from the first main surface 301A toward the side, and the other stands upright from the second main surface 302A toward the side. In other words, the first perforated steel plate dowels 32C protrude from the first main surface 301A and the second main surface 302A toward the width direction of the first steel material unit 20C (first base steel plate 40A) and are arranged parallel to the first base steel plate 40A.

[0086] In the example shown in FIG. 22 and FIG. 23, the first perforated steel plate dowel 32C has a rectangular planar shape defined by a pair of long sides and a pair of short sides, and one long side is connected along the first main surface 301A or the second main surface 302A of the first main steel material 30C. The first perforated steel plate dowel 32C has four dowel holes 320A arranged along the long side direction. However, the number, shape, size, and arrangement pattern of the first dowel holes 320A in the first perforated steel plate dowel 32C are not particularly limited. As shown in FIG. 24, the first perforated steel plate dowel 32C is provided at a position (height) near the center in the up-down direction of the first main steel material 30C.

[0087] Here, the portion of the first main steel material 30C excluding the end region (joint region) where the first perforated steel plate dowel 32C is provided is called the "general steel material portion 307A". The general steel material portion 307A can be said to be a portion located inside each end region (joint region) in the first main steel material 30C. As shown in Figs. 22 and 23, the general steel material portion 307A of the first main steel material 30C is provided with a slip-stop steel material 33A. The shape, number, arrangement pattern, etc. of the slip-stop steel material 33A in the general steel material portion 307A are not particularly limited, but in the illustrated example, the slip-stop steel material 33A is provided at regular intervals along the longitudinal direction of the general steel material portion 307A. In addition, in the illustrated example, the slip-stop steel material 33A is formed of a flat or strip-shaped steel material extending along the vertical direction of the general steel material portion 307A (from the lower end to the upper end). For example, the slip-stop steel material 33A is provided on both the first main surface 301A and the second main surface 302A of the general steel material part 307A. In the illustrated example, the slip-stop steel material 33A is joined by welding or the like to the same positions on both the first main surface 301A side and the second main surface 302A side of the general steel material part 307A. However, the slip-stop steel material 33A may be provided on only one side of the general steel material part 307A.

[0088] Furthermore, rectangular constraining steel plates 5 are installed in each end region in the longitudinal direction of the first steel material unit 20C. The constraining steel plates 5 have a size that covers the upper part of the first perforated steel plate dowel 32C of the first main steel material 30C, and are joined to appropriate positions of each first main steel material 30C by welding or the like in a state in which they are placed across the upper surface 303A of each first main steel material 30C. In FIG. 22, the length dimension of the constraining steel plate 5 along the longitudinal direction of the first steel material unit 20C (extension direction of the first main steel material 30C) is approximately equal to the long side dimension of the first perforated steel plate dowel 32C, and the constraining steel plate 5 covers the upper part of the first perforated steel plate dowel 32C. In addition, the width dimension of the constraining steel plate 5 perpendicular to the longitudinal direction is equal to the width dimension of the first steel material unit 20C. In FIG. 22, the constraining steel plate 5 is shown hatched, and the first perforated steel dowel 32C and other members located below the constraining steel plate 5 are shown in perspective. Reference numeral 51 denotes the long side of the constraining steel plate 5, and reference numeral 52 denotes the short side of the constraining steel plate 5. The constraining steel plate 5 may be provided with an opening for pouring concrete into the joint. In addition, the end region in the longitudinal direction of the first base steel plate 40A is called the constraining steel plate portion 41. The constraining steel plate portion 41 of the first base steel plate 40A is an area disposed opposite the constraining steel plate 5, and covers the lower side of the first perforated steel dowel 32C.

[0089] Furthermore, as shown in FIG. 22 and FIG. 23, an end plate (support steel plate) 34A is joined to the first end surface 305A and the second end surface 306A of the first main steel material 30C. The end plate 34A in this embodiment is a square or rectangular flat steel plate, and is joined to the first end surface 305A and the second end surface 306A of the first main steel material 30C by welding or the like. The end plate 34A is disposed perpendicular to the longitudinal direction of the first main steel material 30C. In addition, the end plate 34A is provided with an opening 341 penetrating the end plate 34A in the thickness direction in order to improve the filling property of concrete when concrete is poured. The shape, position, size, etc. of the opening 341 in the end plate 34A are not particularly limited. In the example shown in FIG. 23, a circular opening 341 is provided near the center of the end plate 34A.

[0090] Next, the second steel material unit 20D will be described in detail. As shown in Fig. 24 and Fig. 25, two second main steel materials 30D are provided on the second base steel plate 40B in parallel with each other along the longitudinal direction of the second base steel plate 40B, and the second main steel materials 30D are arranged facing each other. The second main steel material 30D is a structural steel plate having a flat plate shape whose outer shape is defined by a first main surface 301B, a second main surface 302B, an upper surface 303B, a lower surface 304B, a first end surface 305B, and a second end surface 306B. Each second main steel material 30D is vertically erected from a surface 403B of the second base steel plate 40B, and is arranged at intervals in the width direction of the second base steel plate 40B. In this embodiment, the vertical dimension (height dimension) of the second main steel material 30D is approximately equal to the vertical dimension of the first main steel material 30C. However, the number of second main steel members 30D erected on the second base steel plate 40B There are no particular limitations on the spacing, dimensions, etc.

[0091] A pair of second perforated steel plate dowels 32D are rigidly joined to each end region of each second main steel material 30D by welding or the like. One of the pair of second perforated steel plate dowels 32D stands upright from the first main surface 301B toward the side, and the other stands upright from the second main surface 302B toward the side. In other words, the second perforated steel plate dowels 32D protrude from the first main surface 301B and the second main surface 302B toward the width direction of the second steel material unit 20D (second base steel plate 40B) and are arranged parallel to the second base steel plate 40B.

[0092] In the example shown in FIG. 24 and FIG. 25, the second perforated steel plate dowel 32D has a rectangular planar shape defined by a pair of long sides and a pair of short sides, and one long side is connected along the first main surface 301B or the second main surface 302B of the second main steel material 30D. In addition, the second perforated steel plate dowel 32D has four second dowel holes 320B arranged along the long side direction. However, in the second perforated steel plate dowel 32D, the number, shape, size, and arrangement pattern of the second dowel holes 320B are not particularly limited. In addition, as shown in FIG. 25, the second perforated steel plate dowel 32D is provided at a position (height) near the center in the up-down direction of the second main steel material 30D.

[0093] Here, the portion of the second main steel material 30D excluding the end region (joint region) where the second perforated steel plate dowel 32D is provided is called the "general steel material portion 307B". The general steel material portion 307B can be said to be a portion located inside each end region (joint region) in the second main steel material 30D. As shown in Figs. 24 and 25, the general steel material portion 307B of the second main steel material 30D is provided with a slip-stop steel material 33B. The shape, number, arrangement pattern, etc. of the slip-stop steel material 33B in the general steel material portion 307B are not particularly limited, but in the illustrated example, the slip-stop steel material 33B is provided at regular intervals along the longitudinal direction of the general steel material portion 307B. Also, in the illustrated example, the slip-stop steel material 33B is formed of a flat or strip-shaped steel material extending (from the lower end to the upper end) along the vertical direction of the general steel material portion 307B. For example, the slip-stop steel material 33 is provided on both the first main surface 301B and the second main surface 302B of the general steel material part 307B. In the illustrated example, the slip-stop steel material 33B is joined by welding or the like to the same positions on both the first main surface 301B side and the second main surface 302B side of the general steel material part 307B. However, the slip-stop steel material 33B may be provided on only one side of the general steel material part 307B.

[0094] Furthermore, as shown in Figures 24 and 25, an end plate (support steel plate) 34B is joined to the first end face 305B and the second end face 306B of the second main steel material 30D. The end plate 34B in this embodiment is a square or rectangular flat steel plate, and is joined to the first end face 305B and the second end face 306B of the second main steel material 30D by welding or the like. The end plate 34B is disposed perpendicular to the longitudinal direction of the second main steel material 30D. Also, the end plate 34B is provided with an opening 341, similar to the end plate 34A.

[0095] The longitudinal length of each second main steel material 30D is longer than the long side dimension of the second base steel plate 40B. As a result, the second perforated steel plate dowels 32D formed on both longitudinal ends of each second main steel material 30D are arranged in a state where they protrude outward from the end faces 402B of the second base steel plate 40B.

[0096] In this embodiment, the first main surfaces 301A, 301B of the first main steel material 30C and the second main steel material 30D are also formed as surfaces oriented in the same direction in the width direction when the first steel material unit 20C and the second steel material unit 20D are joined. Similarly, the second main surfaces 302A, 302B of the first main steel material 30C and the second main steel material 30D are also formed as surfaces oriented in the same direction in the width direction when the first steel material unit 20C and the second steel material unit 20D are joined. It is formed as a surface.

[0097] Next, a method for joining the first main steel material 30C in the first steel material unit 20B and the second main steel material 30D in the second steel material unit 20B according to the third embodiment will be described.

[0098] First, as shown in FIG. 26, the first steel material unit 20C and the second steel material unit 20D to be joined to each other are aligned in orientation and height so that the end faces 402A, 402B on the connection end side face each other. The connection end here is the end of the first steel material unit 20C and the second steel material unit 20D in the longitudinal direction that is connected to the other. Note that FIG. 26 shows a part of the connection end side of the first steel material unit 20C and the second steel material unit 20D. As described above, the second perforated steel plate dowel 32D of each second main steel material 30D protrudes outward from the end face 402B in the longitudinal direction of the second base steel plate 40B. That is, the end face 402B of the second base steel plate 40B is arranged at a position retreated inward from the second perforated steel plate dowel 32D of each second main steel material 30D. As a result, the second perforated steel plate dowels 32D in each second main steel material 30D can be inserted into the joint end region of the first steel material unit 20C, and the dowel positioning can be completed as shown in Fig. 27. Note that, for convenience, the illustration of the restraining steel plate 5 covering the upper part of the joint portion 300 is omitted in Fig. 27.

[0099] Fig. 28 is a diagram showing a schematic cross section along the line H-H in Fig. 27. In this embodiment, as shown in Figs. 27 and 28, in a dowel positioning completion state in which the joint end of the first main steel material 30C in the first steel material unit 20C and the connection end side of the second main steel material 30D in the second steel material unit 20D are positioned at a predetermined joint position, the main steel material arrangement interval at which the first main steel material 30C and the second main steel material 30D are spaced apart in the width direction of the first base steel plate 40A is set to a dimension larger than the sum of the width dimensions (short side dimensions) of the first perforated steel plate dowel 32C and the second perforated steel plate dowel 32D. Furthermore, the first perforated steel plate dowel 32C and the second perforated steel plate dowel 32D are arranged near the height center of the first main steel material 30C and the second main steel material 30D, respectively. According to these, in the joint portion 300, the heights of the first perforated steel dowel 32C and the second perforated steel dowel 32D are roughly the same, and they are arranged opposite each other with a gap in the lateral direction.

[0100] From the above-mentioned state where the dowel positioning is completed, concrete is then poured so as to cover the first main steel material 30C in the first steel material unit 20C and the second main steel material 30D in the second steel material unit 20D. At that time, concrete is poured so that not only the end regions of the first main steel material 30C and the second main steel material 30D but also the general steel material parts 307A, 307B are embedded in the concrete. As a result, the first main steel material 30C and the second main steel material 30D can be made into an integral structure through the concrete. Here, FIG. 29 is a diagram showing a state where pouring of concrete 2 into the joint part 300 of the first main steel material 30C and the second main steel material 30D is completed. In the joint part 300, the first perforated steel plate dowel 32C and the second perforated steel plate dowel 32D arranged side by side in the horizontal direction and facing each other are joined together through the concrete 2 in a state where they are embedded in the concrete 2. As a result, the first main steel material 30C and the second main steel material 30D are able to transmit stress to each other via the first perforated steel plate dowel 32C rigidly joined to the end region of the first main steel material 30C, the second perforated steel plate dowel 32D rigidly joined to the end region of the second main steel material 30D, and the concrete 2 interposed between them.

[0101] Furthermore, according to the joint structure of this embodiment, the constraining steel plate 5 and the constraining steel plate portion 41 are arranged to cover the upper and lower parts of the first perforated steel plate dowel 32C and the second perforated steel plate dowel 32D in the joint portion 300. As a result, in addition to constraining the concrete 2 poured in the joint portion 300 from the sides by the end regions of the first main steel member 30C and the second main steel member 30D that are arranged at a distance as a so-called open lap joint, the concrete 2 can also be constrained from above and below by the constraining steel plate 5 and the constraining steel plate portion 41. As a result, This can more effectively suppress the splitting failure of the concrete 2 in the joint 300. That is, when an axial tensile force acts on the first main steel member 30C and the second main steel member 30D, the axial tensile force is transmitted to the concrete 2 via the first perforated steel plate dowel 32C and the second perforated steel plate dowel 32D, and as a result, a shear force is generated in the concrete 2. In contrast, according to this joint structure, the concrete 2 can be restrained from above and below not only by the first main steel member 30C and the second main steel member 30D, but also by the restraining steel plate 5 and the restraining steel plate portion 41. This can improve the shear strength of the concrete 2 cast in the joint 300, and can further improve the joint strength.

[0102] Furthermore, in this embodiment, end plates 34A and 34B are provided on the end faces of the first main steel member 30C and the second main steel member 30D, respectively. Therefore, the concrete 2 poured in the joint portion 300 can be restrained from the end direction by the end plates 34A and 34B. FIG. 30 is a top view of the joint portion 300 and its periphery after pouring the concrete 2. The restraining steel plate 5 is omitted from FIG. 30. As shown in FIG. 30, the end plates 34A and 34B of the first main steel member 30C and the second main steel member 30D are arranged along the boundary between the joint portion 300 and the general portion 310 located outside it. According to this, when stress is applied to the first main steel member 30C and the second main steel member 30D, the concrete 2 in the joint portion 300 is restrained by the supporting pressure Fb of the end plates 34A and 34B, so that the cracking of the concrete 2 in the joint portion 300 can be further suppressed, and the joint strength can be further improved.

[0103] Furthermore, anti-slip steel materials 33A, 33B are arranged at regular intervals in the general steel material parts 307A, 307B of the first main steel material 30C and the second main steel material 30D. This increases the adhesive force between the concrete 2 in the general part 310 and the general steel material parts 307A, 307B, and further enhances the integration of the first main steel material 30C, the second main steel material 30D and the concrete 2.

[0104] Although the preferred embodiment and modifications of the present invention have been described above, the present invention can be implemented by combining the embodiments and modifications as much as possible. [Explanation of symbols]

[0105] 1. Steel concrete structure 2. Concrete 3. Steel frame 4A, 4B, 4C...Reinforcing steel bars 5...Restraint steel plate 20A···First steel unit 20B...Second steel unit 30A...1st main steel material 30B...Second main steel material 32A...First perforated steel plate connector 32B...Second perforated steel plate connector 40A···First base steel plate 40B: Second base steel plate

Claims

1. A steel joint structure for joining a first main steel member and a second main steel member in a steel concrete structure, a first perforated steel plate dowel rigidly joined to the first main steel material; a second perforated steel plate dowel rigidly joined to the second main steel material; Concrete arranged to cover at least the first perforated steel plate connector and the second perforated steel plate connector; Equipped with The first perforated steel plate dowel and the second perforated steel plate dowel are arranged opposite to each other with a gap therebetween, and the first perforated steel plate dowel and the second perforated steel plate dowel are joined together via the concrete in a state where they are embedded in the concrete, a first steel material unit including a plurality of the first main steel materials and a first base steel plate that holds the plurality of the first main steel materials parallel to each other and spaced apart; a second steel material unit including a plurality of the second main steel materials and a second base steel plate that holds the plurality of the second main steel materials parallel to each other and spaced apart; Equipped with A plurality of the first main steel members are erected vertically from the first base steel plate, and a plurality of the second main steel members are erected vertically from the second base steel plate. Steel joint structure in steel concrete structure.

2. The first main steel material and the second main steel material are arranged parallel to each other, The first perforated steel plate dowel is provided vertically from the first main steel material, and the second perforated steel plate dowel is provided vertically from the second main steel material. A steel joint structure in a steel concrete structure according to claim 1.

3. The first perforated steel plate dowel and the second perforated steel plate dowel are arranged opposite each other with a gap in the vertical direction.

3. A steel joint structure in a steel concrete structure according to claim 1 or 2.

4. The first main steel material and the second main steel material are joined in a state where a main surface in an end region of the first main steel material and a main surface in an end region of the second main steel material are joined to each other. A steel joint structure in a steel concrete structure according to any one of claims 1 to 3.

5. Further provided is a rod-shaped or plate-shaped reinforcing iron material inserted across the dowel holes of the first perforated steel dowel and the dowel holes of the second perforated steel dowel, A steel joint structure in a steel concrete structure according to any one of claims 1 to 4.

6. A restraining steel plate that restrains concrete at a joint portion between the first main steel material and the second main steel material is provided so as to cover the upper part of the first perforated steel plate dowel and the second perforated steel plate dowel. A steel joint structure in a steel concrete structure according to any one of claims 1 to 4.

7. A steel joint structure for joining a first main steel member and a second main steel member in a steel concrete structure, a first perforated steel plate dowel rigidly joined to the first main steel material; a second perforated steel plate dowel rigidly joined to the second main steel material; Concrete arranged to cover at least the first perforated steel plate connector and the second perforated steel plate connector; Equipped with The first perforated steel plate dowel and the second perforated steel plate dowel are arranged opposite to each other with a gap therebetween, and the first perforated steel plate dowel and the second perforated steel plate dowel are joined together via the concrete in a state where they are embedded in the concrete, The first main steel material and the second main steel material are disposed such that main surfaces in the end regions of the first main steel material and the second main steel material face each other with a gap therebetween in the lateral direction, The first perforated steel plate dowel and the second perforated steel plate dowel are arranged opposite each other with a space therebetween in the lateral direction. Steel joint structure in steel concrete structure.

8. The first perforated steel plate dowel is rigidly joined to an end region of the first main steel material, and the second perforated steel plate dowel is rigidly joined to an end region of the second main steel material, An end plate is rigidly joined to an end surface of the first main steel material and an end surface of the second main steel material perpendicular to the longitudinal direction of each main steel material. A steel joint structure in a steel concrete structure according to claim 7.

9. A restraining steel plate for restraining concrete is provided at a joint portion between the first main steel material and the second main steel material so as to cover the upper and lower parts of the first perforated steel plate dowel and the second perforated steel plate dowel. A steel joint structure in a steel concrete structure according to claim 7 or 8.

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