JP6570896B2 - Steel concrete structure - Google Patents

Description

  The present invention relates to a steel-concrete structure, and more particularly to a steel-concrete structure that has been efficiently reinforced by lattice reinforcing bars.

  Steel-framed reinforced concrete structures (SRC structures) are known to have greater proof stress and deformation performance than reinforced concrete structures (RC structures) and have excellent seismic performance. However, compared to RC structures, the construction of SRC structures tends to decrease because the design method is complicated and there are many on-site work processes. Therefore, in order to take advantage of the SRC structure, various steel-frame concrete structures (SC structures) in which the steel frame is used as the main structural material and the steel frame is surrounded by concrete have been proposed, and experiments for confirming their structural effectiveness have been made. (Non-Patent Documents 1 and 2). In these SC structures, lattice reinforcing bars and wire nets are arranged in a cross section corresponding to the side of the member, and concrete is supplementarily reinforced.

  By the way, in order for the grid-like reinforcing bars arranged in the cross section to function effectively against cracks in concrete, it is necessary to fix both ends of these reinforcing bars to the concrete. In the test body of Non-Patent Document 1, a horizontal reinforcing bar positioned so as to surround a member cross section is processed into a closed type and arranged. In the test body of Non-Patent Document 2, a 135-degree hook is provided at the end of the reinforcing bar in the horizontal direction of the welded wire mesh to perform reinforcing bar-like bar arrangement.

Koichi Minami et al., “Development of a new type of steel-concrete structure, summary of academic lectures of the Architectural Institute of Japan, September 2006, p. Goto Yasuaki et al., “Experimental Study on Effect of Wire Mesh Reinforcement on Seismic Performance of Steel-Concrete Columns”, Hokkaido Architectural Institute Hokkaido Branch Report No. 83, July 2010, p. 89-94

  As disclosed in Non-Patent Documents 1 and 2, the transverse (cross-sectional) rebar is processed into a completely closed type or a closed type with a 135-degree hook by welding, and the longitudinal (longitudinal) rebar is In the method of integrally forming a hook, it is necessary to install a predetermined number of transverse reinforcing bars at predetermined positions before building a steel frame, and then assemble the reinforcing bars into a hook shape. For this reason, rebar construction and steel construction work interfere, and construction management becomes complicated. Moreover, since the reinforcing bars are arranged in advance, there is a problem that the workability of the construction method of the steel frame is lowered. Similarly, in the method of assembling the reinforcing bar rods on the site, the vertical reinforcing bar and the horizontal reinforcing bar are separately manufactured as in the conventional SRC structure. Means are needed.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the problems of the above-described conventional technology and provide a steel concrete structure capable of efficiently incorporating a reinforcing bar as an auxiliary member in a hook shape at the site.

In order to achieve the above object, a steel concrete structure according to the present invention comprises a steel concrete provided with a steel member arranged along the material axis direction of the member and a concrete that forms a member outer shape so as to include the steel member. A material having the same diameter, the length in the axial direction being shorter than the distance between the beam-to-column joints to which the ends of the steel members are joined, the length in the width direction being shorter by a predetermined covering than the outer width of the member It is equipped with a grid-like reinforcing bar panel in which axial reinforcing bars and reinforcing bars perpendicular to the material axis are arranged vertically and horizontally,
The grid-like reinforcing bar panel is arranged except for one corner of the reinforcing bar in the material axis direction, hooks are formed at both ends of the reinforcing bar in the material axis orthogonal direction, and the grid-like reinforcing bar panel is the steel frame. The members are arranged along each side of the member outer shape so as to surround the member from all sides, and the hooks of the reinforcing bars in the material axis orthogonal direction are positioned at the corners of the latticed reinforcing bar panels arranged adjacent to each other. It is latched by the said material axial direction reinforcing bar, and between the said adjacent grid | lattice-like reinforcing bar panels is connected.

The hook is preferably a 90- degree hook.

Furthermore, it is preferable to provide the coated steel plate surrounding the member outer shape at the end of the member in the axial direction of the member. In this case, the hook does not have to be provided in the material axis orthogonal rebar located at the center of the member in the material axis direction.

  The grid-like reinforcing bar panel is preferably a welded wire mesh.

The assembly perspective view which showed the assembly state of the reinforcing bar rod of the steel concrete pillar as one embodiment of the steel concrete structure of this invention. The top view and front view in the assembly state shown in FIG. The perspective view which showed the state after the assembly of the reinforcing bar shown in FIG. The top view which showed the assembly state of the reinforcing bar cage by other embodiment. Furthermore, the top view which showed the assembly state of the reinforcing bar cage by other embodiment. The front view which showed the state after the assembly of other embodiment of a steel concrete pillar, and each part sectional drawing.

  Hereinafter, the assembly state of the steel frame and the steel bar of the steel-concrete structure handled in one embodiment of the present invention and the construction procedure thereof will be described with reference to FIGS.

  1, in the construction floor 1, a reinforcing bar 10 (FIG. 3) as an auxiliary reinforcing bar is assembled around a steel column 2 erected so as to penetrate between a lower floor, a construction floor, and an upper floor. It is the assembly perspective view which showed the state. In the figure, four grid-like reinforcing bars arranged so as to surround the steel column 2 from the periphery are shown. As shown in FIGS. 1, 2A, and 2B, the grid-shaped reinforcing bar panel 11 of the present embodiment includes a horizontal reinforcing bar 12 (rebar perpendicular to the material axis) and a vertical reinforcing bar 13 (rebar in the axial direction). ) Are arranged at regular intervals in the vertical and horizontal directions, and each meshing point (mesh) is fixed by welding. As shown in FIG. 2A, the lateral reinforcing bar 12 has a length (short side length) that secures a predetermined covering with respect to the column cross section, and has a predetermined length that functions as a bending fixing portion at both ends. A 90-degree hook is formed and has a substantially U-shape that is flat in plan view. As shown in FIG. 2 (b), the longitudinal reinforcing bars 13 are straight bars having a length slightly shorter than the length (long side length) corresponding to the inner height of the pillar 3 of each floor. In addition, although each figure shows the steel column 2 having a cross-shaped cross section formed by assembling narrow-width H-shaped steel, the cross-sectional shape of the steel column and any steel material used can be supported. Needless to say.

  Such a grid-like reinforcing bar panel 11 can be used by processing a ready-made welded wire mesh. The dimensions are preferably a square mesh having a wire diameter of 6 mm and a vertical and horizontal scale of 75 to 150 mm (preferably 100 mm). Further, a deformed steel bar (D6, D10, etc.) having a predetermined wire diameter may be processed and assembled into a shape as shown in each drawing of FIG. In addition, as shown in FIG. 2A, each of the lattice-shaped reinforcing bar panels 11 used for assembly has no reinforcing bars arranged at one end of the longitudinal reinforcing bars 13 arranged in parallel. This is because when the latticed reinforcing bar panel 11 is assembled into a square shape in plan view as shown in FIG. 3, one longitudinal reinforcing bar 13 is arranged at each corner. Because.

  In order to assemble the reinforcing bar rod 10 by combining these grid-like reinforcing bar panels 11, first, as shown in FIGS. 1 and 2A, the steel column 2 is already erected with the flange interposed therebetween. As described above, the two grid-like reinforcing bar panels 11 are erected while securing a predetermined covering from the column outer shape. At this time, it is preferable to arrange a reinforcing bar holding jig 5 that also serves as a spacer on the outer surface of the flange of the steel column 2 so as to hold a part of the longitudinal reinforcing bar 13 of the lattice reinforcing bar panel 11. After the two opposing grid-like reinforcing bar panels 11A are positioned and fixed, the folding fixing part of the grid-like reinforcing bar panel 11B from the side is placed on the side of the bending fixing part where the longitudinal reinforcing bars 13C at the corners are not arranged. Inserting in the direction of the arrow shown in FIG. 2A, the longitudinal reinforcing bars 13C of the grid-like reinforcing bar panel 11B are arranged at the corners of the reinforcing bar 10 (FIG. 3) to surround the outer periphery of the steel column 2. The reinforcing bar 10 can be assembled. Further, as another assembling method of the reinforcing bar rod 10, on the side of the bending fixing portion where the corner portion longitudinal reinforcing bars 13C of the respective grid-like reinforcing bar panels 11A (11B) having the shape shown in FIG. On the other hand, the four grid-like reinforcing bars are counterclockwise in order by combining the bent fixing portions where the corner-direction vertical reinforcing bars 13C of the other grid-like reinforcing bar panels 11B (11A) assembled adjacently are not arranged. The reinforcing bar 10 can be assembled by joining the corners of the panels 11A, 11B, 11A, and 11B. Further, as shown in FIG. 2 (c), a grid-like reinforcing bar panel 11A having corner-longitudinal reinforcing bars 13C on both sides of the lateral reinforcing bar 12 is added to a grid-like reinforcing bar panel having no corner-longitudinal reinforcing bars 13C. You may make it assemble the rebar rod 10 combining it so that 11B may be covered.

  Each figure in FIG. 4 is composed of a single lattice-shaped reinforcing bar panel 11 (FIG. 4A) having an L-shape in plan view on two adjacent sides, and this lattice-shaped reinforcing bar panel 11 is viewed from a diagonal position. FIG. 4 shows an embodiment in which the steel column 2 is combined so as to be sandwiched, and a □ -shaped reinforcing bar rod 10 (FIG. 4C) is assembled in plan view. A 90-degree hook 14 and a 135-degree hook 15 are formed at both ends of the L-shaped latticed reinforcing bar panel 11. In order to combine the two grid-like reinforcing bar panels 11, as shown in FIG. 4B, the 90-degree hook 14 of one grid-like reinforcing bar panel 11 fixed in advance to the steel column 2 side is connected to the other. The grid reinforcing bar panel 11 is engaged with the vertical reinforcing bar 13C at the corner of the 135 degree hook 15 side of the grid reinforcing bar panel 11, and the grid reinforcing bar panel 11 is rotated in the direction of the arrow around the vertical reinforcing bar 13C. The 90-degree hooks 14 are locked to the longitudinal reinforcing bars 13C at the corners. Thereby, the rebar rod 10 can be assembled easily and accurately. In this embodiment as well, as shown in FIG. 4A, the longitudinal rebar 13C is not arranged at the bent portion (corner portion) of the 90-degree hook 14. As a result, when the grid-like reinforcing bar panel 11 is assembled as shown in FIG. 4C, one corner longitudinal reinforcing bar 13C is arranged at each corner.

  5 is different from the grid-like reinforcing bar panel 11 (FIG. 5A) having three sides that surrounds the steel column 2 and has a substantially U-shape in plan view. An embodiment is shown in which the remaining one side on the open side of the panel 11 is closed, and a square reinforcing bar rod 10 (FIG. 5B) is assembled in a plan view. In the present embodiment, 135-degree hooks 15 are formed at both ends of the lattice-shaped reinforcing bar panel 11 having a substantially U-shape, and 90-degree hooks 14 are formed at both ends of the lattice-shaped reinforcing bar panel 11 constituting one side. The 90-degree hooks 14 and the 135-degree hooks 15 may be formed at both ends of each lattice-shaped reinforcing bar panel 11, and the reinforcing bar rod 10 may be assembled as shown in FIG.

  FIG. 6A shows an embodiment in which the coated steel plate 20 covers a predetermined range of the leg portion and the outer peripheral surface of the top portion of the concrete portion as the SC column 3 in addition to the grid-like reinforcing bar panel 11 surrounding the steel column 2. The form is shown. The coated steel plate 20 is preferably set according to the generated stress of the beam-column joint in the range of about 0.5 to 1.0 D with respect to the columnar D. In this embodiment, as the coated steel plate 20, a processed steel plate of a general rolled steel for general structure is used. If a predetermined reinforcing strength as the coated steel plate 20 is obtained, a punching metal or an expanded metal having a predetermined opening ratio can be used instead of the flat steel plate. In this embodiment, the coated steel plates are provided at both ends of the member like the column leg and top, but by determining the necessity of stiffening, for example, only one of the members, such as only the column base. You can also

  In the present embodiment, the coated steel plate 20 is applied in a predetermined range from the column beam joint portion, and the stress generated at the column end is supplementarily reinforced. On the other hand, since the axial force in the column direction is dominant in the center portion in the material length direction of the SC column 3, the constraint in the column hoop direction may be small. Therefore, the lattice-shaped reinforcing bar panel 11 of the present embodiment is configured as a flat panel panel in which no hook is formed at the end, as shown in FIG. In each of the embodiments shown in FIGS. 1, 4, and 5, the hook at the center portion of the material length of the SC column 3 can be omitted when the acting stress of the column is small.

  The present invention is not limited to the embodiment described above. That is, each embodiment has been described by taking a steel concrete column (SC column) as an example, but the same configuration is also achieved in a steel concrete beam (SC beam), and various modifications within the scope of the claims are made. Is also possible. In other words, embodiments obtained by combining technical means appropriately changed within the scope of the claims are also included in the technical scope of the present invention.

1 Construction floor 2 Steel column 3 Steel concrete column (SC column)
DESCRIPTION OF SYMBOLS 10 Reinforcing bar 11 Grid-like reinforcing bar panel 12 Horizontal reinforcing bar 13 Longitudinal reinforcing bar 13C Corner vertical reinforcing bar 14 90 degree hook 15 135 degree hook 20 Covered steel sheet

Claims (4)

A steel-concrete structure comprising a steel member disposed along a material axis direction of the member, and concrete that forms a member outer shape so as to include the steel member;
Axial length is shorter than the distance between the beam-to-column joints where the ends of the steel members are joined, and the length in the width direction is shorter than the outer shape width of the member by a predetermined covering, and the same axial diameter reinforcing bar and material It has a grid-like reinforcing bar panel with longitudinal and horizontal reinforcing bars.
The grid-like reinforcing bar panel is arranged except for the reinforcing bar at one corner of the reinforcing bar in the material axis direction, and hooks are formed at both ends of the reinforcing bar in the material axis orthogonal direction,
The grid-like reinforcing bar is arranged so as to follow the sides of the outer shape of the member so that the grid-like reinforcing bar panel surrounds the steel member from four directions, and the hooks of the reinforcing bars in the material axis orthogonal direction are arranged adjacent to each other. A steel-concrete structure, characterized in that it is engaged with the material axial rebars located at each corner of the panel, and the adjacent rebar panels are connected. The steel concrete structure according to claim 1, wherein the hook is a 90-degree hook. Furthermore, the steel-concrete structure of Claim 1 provided with the covering steel plate which surrounds the said member external shape in the material edge part of the axial direction of the said member. The steel-concrete structure according to claim 1, wherein the lattice-shaped reinforcing bar panel is made of a welded wire mesh.

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