JP4551226B2 - Steel plate concrete structure - Google Patents

Description

  The present invention relates to a steel plate concrete structure used as a member constituting, for example, a wall, a floor, and a roof (ceiling).

  Conventionally, a steel plate concrete structure is known in which concrete is placed between a pair of opposed steel plates (see, for example, Patent Document 1).

In such a steel plate concrete structure, in order to integrate the steel plate and the concrete, a plurality of shear connectors are fixed to the inner surface (opposing surface) of each steel plate.
JP 5-44283 A (all pages)

  By the way, since the steel plate concrete structure of patent document 1 was developed in view of using it for a nuclear power plant or a nuclear related facility, it is a very heavy structure. Therefore, if this steel plate concrete structure is applied as it is to a general building as it is, it will be more heavy than necessary, which is very uneconomical.

  Moreover, when using a steel plate concrete structure for a general building, it is possible to make the thickness (that is, the interval between the steel plates) smaller than that used for nuclear facilities, but the interval between the steel plates. Depending on the length of the shear connector, the shear connector provided on one steel plate may contact the shear connector provided on the other steel plate. In such a case, a predetermined number of shear connectors are attached to each steel plate. It may be difficult to arrange.

  From such a viewpoint, it is an object of the present invention to provide an economical steel plate concrete structure that can be suitably used for general buildings.

  The present invention created in order to solve such problems includes a first steel plate to which a plurality of first shear connectors are fixed, a second steel plate facing the first steel plate across the first shear connector, and A steel plate concrete structure comprising concrete cast between the first steel plate and the second steel plate, wherein the thickness of the second steel plate is smaller than the thickness of the first steel plate, The first shear connector and a plurality of second shear connectors shorter than the first shear connector are fixed to the two steel plates.

  According to the steel plate concrete structure having such a configuration, since the second steel plate is made thinner than the first steel plate, there is no excessive design when applied to a general building in which no great stress is generated on the second steel plate. As a result, the cost can be reduced.

  In general, the magnitude of strain at which local buckling occurs in a steel sheet depends on the ratio (B / t) between the distance between shear connectors (ie, the buckling length) B and the sheet thickness t of the steel sheet. In addition, since the strain at which local buckling occurs becomes smaller as B / t increases, for the second steel plate that is thinner than the first steel plate, the second shear connector that defines the local buckling strength is used as the first steel plate. In the present invention, the first shear connector also serves as a “shear connector” of the second steel plate, where it is necessary to arrange more than the first shear connector that defines the local buckling strength of As compared with the case where the first shear connector is not fixed to the second steel plate, the number of the second shear connectors can be reduced, and as a result, the cost can be reduced.

  Further, in the present invention, since the first shear connector is fixed to both the first steel plate and the second steel plate, when the concrete is placed between the first steel plate and the second steel plate, the first shear connector is attached. The shear connector functions as a so-called separator that maintains the distance between the first steel plate and the second steel plate.

  Here, in the present invention, the first steel plate and the second steel plate include a plate material made of aluminum as well as a plate material made of aluminum alloy. Moreover, as a 1st shear connector and a 2nd shear connector, steel studs (including a head), a deformed reinforcing bar, a steel bar, etc. can be used, for example.

  In the present invention, a plurality of through holes may be formed in the second steel plate corresponding to the arrangement of the plurality of first shear connectors, and the first shear connector may be fixed to the inner surface of the second steel plate. If it does in this way, since the 1st shear connector does not protrude on the outer surface of the 2nd steel plate, even if it is a case where the outer surface of the 2nd steel plate is used as a finishing surface, the appearance of a building is not spoiled. Moreover, at the time of production of the steel plate concrete structure, by using the through holes, the position of the first shear connector can be confirmed visually even after the second steel plate is overlaid on the first steel plate, It is possible to easily and accurately align the second steel plate. In addition, when the first shear connector is fixed to the second steel plate by welding, the workability is good because welding can be performed from the outer surface side of the second steel plate.

  In addition, when said 1st shear connector consists of a stud with a head, it is good to adhere the head of the said stud with a head to the inner surface of said 2nd steel plate. If it does in this way, even if there is a mounting error in a headed stud, it will become possible to perform alignment with the penetration hole of the 2nd steel plate easily.

  When a plurality of the first shear connectors are arranged in a lattice shape, the second shear connector may be arranged only inside a rectangular area having four adjacent first shear connectors as apexes. In other words, when it is assumed that there is no first shear connector and the arrangement of the second shear connector is planned, the second shear connector is located on the line connecting two first shear connectors that are adjacent in the vertical or horizontal direction. If arranged, this may be thinned out. In this way, since the number of second shear connectors can be reduced, the cost can be reduced. Even if the second shear connector is thinned out, the same local buckling strength and proof stress as those in the case where the second shear connector is not thinned out are obtained.

  The steel plate concrete structure according to the present invention has necessary and sufficient strength and proof strength for a general building and is economical.

  Hereinafter, the best mode for carrying out a steel plate concrete structure according to the present invention will be described in detail with reference to the accompanying drawings.

  The steel plate concrete structure according to the present embodiment is used as a member constituting, for example, a wall, a floor, and a roof (ceiling), and faces the first steel plate 1 as shown in FIG. A second steel plate 2 and a concrete 3 placed between the first steel plate 1 and the second steel plate 2 are provided.

  The 1st steel plate 1 consists of a board | plate material which has iron as a main component, and a board | plate material made from an aluminum alloy, and several 1st shear connectors 11, 11, ... adhere to the inner surface (surface facing the 2nd steel plate 2). Has been. The plurality of first shear connectors 11, 11,... Are arranged at regular intervals in the vertical and horizontal directions of the first steel plate 1, as shown in FIG. Presents.

  As shown in FIG. 1, the first shear connector 11 is made of a steel headed stud in which a head portion 11 b is formed at one end of the shaft portion 11 a, and in this embodiment, the shaft portion 11 a is the first steel plate 1. It is fixed to the inner surface by welding. In addition, a deformed reinforcing bar or a steel bar may be used as the first shear connector 11. Further, the first shear connector 11 may be fixed to the first steel plate 1 by a mechanical joining method using bolts, drill screws or the like.

  Here, the magnitude | size of the distortion | strain which a local buckling generate | occur | produces in the 1st steel plate 1 is the space | interval (buckling length) B1 of the 1st shear connectors 11 and 11 adjacent to a vertical direction or a horizontal direction, and the 1st steel plate 1. Since it depends on the ratio of the plate thickness t1 (B1 / t1), the distance B1 between the first shear connectors 11 and 11 is determined by the local buckling strength and proof strength necessary for the design and the plate thickness t1 of the first steel plate 1. What is necessary is just to set, considering.

  The second steel plate 2 is opposed to the first steel plate 1 with the first shear connector 11 in between. Although the 2nd steel plate 2 consists of a board | plate material which has iron as a main component, and the board | plate material made from an aluminum alloy, the board thickness t2 is smaller than the 1st steel plate 1, In this embodiment, board thickness t1 of the 1st steel plate 1 is. 1/2 of this. In the second steel plate 2, a plurality of through holes 2a, 2a,... Are formed corresponding to the arrangement of the plurality of first shear connectors 11, 11,. The tip of the first shear connector 11 (in this embodiment, the head portion 11b of the headed stud) is fixed to the surface of the through hole 2a. Specifically, the first shear connector 11 is fixed to the inner surface of the second steel plate 2 by welding the tip and the hole wall portion of the through hole 2 a from the outer surface side of the second steel plate 2. The first shear connector 11 may be fixed to the second steel plate 2 by a mechanical joining method using bolts, drill screws, or the like. Here, the hole diameter of each through hole 2a is preferably smaller than the outer diameter of the tip of the first shear connector 11 (the head 11b of the headed stud in the present embodiment). The outer diameter (shaft diameter) of the shaft portion 11a is approximately the same.

  A plurality of second shear connectors 21, 21,... Shorter than the first shear connector 11 are fixed to the inner surface of the second steel plate 2.

  The second shear connector 21 is a stud with a head having a head portion 21b formed at one end of the shaft portion 21a. In this embodiment, the shaft portion 21a is fixed to the inner surface of the second steel plate 2 by welding. Note that a deformed reinforcing bar, a steel bar, or the like may be used as the second shear connector 21. Further, the second shear connector 21 may be fixed to the second steel plate 2 by a mechanical joining method using a bolt or a drill screw.

  Here, as shown in the schematic diagram shown in FIG. 2A, the second shear connector 21 is provided only inside the rectangular area A having the four first shear connectors 11, 11,. Has been placed. In the present embodiment, the rectangular area A is a square, and the second shear connector 21 is disposed at the center of the rectangular area A.

  The arrangement of the second shear connector 21 is first required in terms of design as shown in the schematic diagram shown in FIG. 2B after the first shear connector 11 is regarded as the second shear connector 21. Based on the local buckling strength and proof stress and the thickness t2 of the second steel plate 2 (see FIG. 1), the interval B2 ′ between the second shear connectors 21 and 21 adjacent in the vertical direction or the horizontal direction is determined. A second shear connector 21 'located on the line segment S1 connecting the first shear connectors 11, 11 adjacent in the vertical direction and a second segment located on the line segment S2 connecting the first shear connectors 11, 11 adjacent in the horizontal direction. It is obtained by thinning out the two shear connectors 21 ". In this embodiment, the plate thickness t2 of the second steel plate 2 is set to 1/2 of the plate thickness t1 of the first steel plate 1 (see FIG. 1). The first shear connector 11 is regarded as the second shear connector 21. In this case, the distance B2 ′ between the second shear connectors 21 (21 ′, 21 ″) is ½ of the distance B1 between the first shear connectors 11, 11, and as a result, the second shear connectors 21 (21 ′, 21 ′, 21 ″) is arranged as shown in FIG. 2B. From here, the second shear connector located on the line segment S1 connecting the first shear connectors 11 and 11 adjacent in the vertical direction is arranged. When the second shear connector 21 ″ located on the line segment S2 connecting 21 ′ and the first shear connectors 11 and 11 adjacent in the horizontal direction is thinned out, an arrangement as shown in FIG.

  Next, the construction method of the steel plate concrete structure having the above configuration will be described in detail with reference to FIG.

  In order to construct a steel plate concrete structure, the first steel plate 1, the second steel plate 2, the first shear connector 11 and the second shear connector 21 are combined to form a steel shell, and then the first steel plate 1 and the second steel plate 2 Concrete 3 (see FIG. 1) may be placed between the two.

  More specifically, first, a plurality of first shear connectors 11, 11,... Are erected on the inner surface of the first steel plate 1, and the base ends (the end portions of the headed stud shaft portion 11a) are first welded. It adheres to the steel plate 1. In addition, a plurality of through holes 2a, 2a,... Are formed in the second steel plate 2 in accordance with the arrangement of the first shear connectors 11, 11,. .. Are erected at the center of the rectangular area A ′ having the apex as the apex, and the base end (the shaft portion 21a of the headed stud shown in FIG. Are fixed to the second steel plate 2 by welding.

  Subsequently, in a state where the second shear connector 21 is opposed to the first steel plate 1, the plurality of first shear connectors 11, 11,... Are covered with the second steel plate 2, and the plurality of through holes 2a, 2a,. After adjusting the position of the second steel plate 2 so that the first shear connector 11 can be seen from each, the tip of the first shear connector 11 (the head 11b of the headed stud) is welded using each through hole 2a. It adheres to the second steel plate 2.

  Thereafter, if concrete 3 (see FIG. 1) is placed between the first steel plate 1 and the second steel plate 2 and cured, the steel plate concrete structure according to the present embodiment is completed. In addition, the composition and strength of the concrete 3 may be set as appropriate in consideration of the magnitude of the load acting on the building, etc. However, if so-called high-fluidity concrete or highly self-filling concrete is used, the workability is improved. .

  In addition, this steel plate concrete structure can be applied to a precast method that is pre-manufactured at a factory or a construction yard in the construction site, or only a steel shell is produced at the factory and concrete is placed at the construction site. It can also be applied to the half precast method. Needless to say, a steel shell may be manufactured at the construction site.

  And according to the steel plate concrete structure concerning this embodiment, since the plate | board thickness of the 2nd steel plate 2 was made thinner than the 1st steel plate 1 (refer FIG. 1), the big building which a big stress does not generate | occur | produce in the 2nd steel plate 2 When applied to, the design is not excessive, and as a result, the cost can be reduced.

  In addition, since the first shear connector 11 also plays a role as a “shear connector” of the second steel plate 2, the second shear connector 11 is compared with the case where the first shear connector 11 is not fixed to the second steel plate 2. It is possible to reduce the number of shear connectors 21 and, in turn, to reduce material costs. Furthermore, according to the steel plate concrete structure according to the present embodiment, compared with the case where the first shear connector 11 is not fixed to the second steel plate 2, the number of welded portions is reduced, so that the production time is shortened accordingly. In addition, it is possible to suppress welding distortion generated in the second steel plate 2.

  Even if the second shear connectors 21 ′ and 21 ″ (see FIG. 2B) arranged on the line segments S1 and S2 connecting the first shear connectors 11 and 11 are thinned out, The distance B2 ′ between the first shear connector 11 and the second shear connector 21 (see FIGS. 4A and 4B) is the distance B2 ′ (FIG. ) And (b))), the portion Z where local buckling occurs in the second steel plate 2 is the same as when the second shear connectors 21 ′ and 21 ″ are not thinned out (see FIG. 4 and FIG. 4). (See FIG. 5). That is, even if the second shear connectors 21 ′ and 21 ″ (see FIG. 5A) arranged on the line segments S1 and S2 connecting the first shear connectors 11 and 11 are thinned out, they are not thinned out. Local buckling strength and yield strength equivalent to the case can be obtained.

  Moreover, in this embodiment, since the 1st shear connector 11 was fixed to the inner surface of the 2nd steel plate 2, the 1st shear connector 11 does not protrude on the outer surface of the 2nd steel plate 2, Therefore, the 2nd steel plate 2 Even when the outer surface of the building is used as a finished surface, the beauty of the building is not impaired.

  Furthermore, at the time of production of the steel plate concrete structure, even after the second steel plate 2 is overlaid on the first steel plate 1, by using the through holes 2a, 2a,. Since the position of the first shear connector 11 can be visually confirmed, the second steel plate 2 can be easily and accurately aligned. In addition, since the second steel plate 2 and the first shear connector 11 can be welded from the outer surface side of the second steel plate 2 by using the through holes 2a, 2a,.

  In addition, in the present embodiment, a headed stud is used as the first shear connector 11, and the head 11b of the headed stud is welded to the inner surface of the second steel plate 2. Even if there exists, it becomes possible to perform alignment with the stud with a head which is the 1st shear connector 11, and the through-hole 2a of the 2nd steel plate 2. FIG. Furthermore, in this embodiment, since the hole diameter of the through hole 2a is smaller than the outer diameter of the head 11b of the headed stud, the through hole 2a of the second steel plate 2 can be reliably blocked by the head 11b. Therefore, when the concrete 3 is placed, moisture in the concrete 3 does not leak from the through hole 2a.

  Furthermore, in this embodiment, since the first shear connector 11 is fixed to both the first steel plate 1 and the second steel plate 2, the concrete 3 is placed between the first steel plate 1 and the second steel plate 2. In doing so, the first shear connector 11 functions as a so-called separator that keeps the distance between the first steel plate 1 and the second steel plate 2.

  The thickness t2 of the second steel plate 2 is not limited to that shown in the drawing as long as it is smaller than the thickness t1 of the first steel plate 1, but may be changed as appropriate. If t2 is 1 / N of the plate thickness t1 of the first steel plate 1 (N is an integer of 2 or more), B1 / t1 of the first steel plate 1 and B2 / t2 of the second steel plate 2 are equal, and the first steel plate 1 1 and the second steel plate 2 are suitable because the local buckling strength can be matched.

It is sectional drawing of the steel plate concrete structure which concerns on embodiment. It is a schematic diagram for demonstrating arrangement | positioning of the 1st shear connector and the 2nd shear connector in the steel plate concrete structure which concerns on embodiment, Comprising: (a) is a figure which shows the state after thinning out the 2nd shear connector, (b) ) Is a diagram showing a state before thinning out the second shear connector. It is a disassembled perspective view of the steel plate concrete structure which concerns on embodiment. It is the schematic diagram which showed the position of the local buckling which generate | occur | produces in the steel plate concrete structure concerning embodiment, Comprising: (a) is a front view at the time of thinning out the 2nd shear connector, (b) is sectional drawing of (a). It is. It is the schematic diagram which showed the position of the local buckling which generate | occur | produces in the steel plate concrete structure which concerns on embodiment, Comprising: (a) is a front view when not decimating the 2nd shear connector, (b) is the cross section of (a) FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st steel plate 2 2nd steel plate 2a Through-hole 3 Concrete 11 1st shear connector 21 2nd shear connector

Claims (4)

A first steel plate to which a plurality of first shear connectors are fixed;
A second steel plate facing the first steel plate across the first shear connector;
A steel plate concrete structure comprising concrete cast between the first steel plate and the second steel plate,
The plate thickness of the second steel plate is smaller than the plate thickness of the first steel plate,
A steel plate concrete structure, wherein the first shear connector and a plurality of second shear connectors shorter than the first shear connector are fixed to the second steel plate. In the second steel plate, a plurality of through holes are formed corresponding to the arrangement of the plurality of first shear connectors,
The steel plate concrete structure according to claim 1, wherein the first shear connector is fixed to an inner surface of the second steel plate. The first shear connector comprises a headed stud;
The steel plate concrete structure according to claim 2, wherein a head of the headed stud is fixed to an inner surface of the second steel plate. The plurality of first shear connectors are arranged in a grid pattern,
The said 2nd shear connector is arrange | positioned only inside the rectangular area | region which makes the said four adjacent 1st shear connectors the vertex, The Claim 1 thru | or 3 characterized by the above-mentioned. Steel plate concrete structure.

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