JP2005344419A - Building structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a rational and efficient joining method between a reinforced concrete column and a steel beam.
Among two-way steel beams to be joined to a joint portion, one-way steel beam 1A joins the middle portion to the joint portion, and the other direction steel beam 1B has its end portion as a joint portion. In the end of the steel beam in the other direction, a support plate 5 for transmitting a bending moment to the joint is provided facing the side of the steel beam in one direction. A reinforcing steel plate 8 for restraining the deformation is attached. Each steel beam in both directions is a continuous beam having a length corresponding to two spans, and a bearing plate is provided at both ends thereof, and these beams are installed by alternately changing the direction.
[Selection] Figure 1

Description

  The present invention relates to a structure of a composite structure of reinforced concrete columns and steel beams.

As this type of composite structure, the steel-rebar composite structure shown in Patent Document 1 is well known. This is done by attaching joint structures for connecting steel beams of multiple floors in advance to column reinforcement bars for multiple floors (heights), and joining the steel beams of each floor to these joint structures. Therefore, it is possible to construct a building with a short construction period and low construction cost.
Japanese Patent Publication No. 6-6818

  By the way, in the steel-steel-rebar composite structure shown in Patent Document 1, it is necessary to manufacture the joint structure in advance in the factory. However, in manufacturing the joint structure, the steel frame and the steel material are processed into a complex shape and assembled by welding. Therefore, the production cost increases. In addition, column rebar rods with a plurality of such joint components are considerably large and heavy, which increases the cost of transportation, and when building on-site, all steel beams are individually jointed. It is said that the number of joints is extremely large because bolts are fastened to the structure, and the workability is not necessarily good.

  Therefore, for example, as shown in FIG. 4, steel beams 1A and 1B in both directions are welded in the field without using the above-described joint structure. This is because when the steel beams 1A and 1B in both directions are joined to the reinforced concrete column 2, the one-way beam bracket 3A is disposed through the joint (column-beam joint) and the other direction on both sides thereof. The beam brackets 3B are welded, and the steel beam beams 1A, 1B in both directions are bolted to the beam brackets 3A, 3B via the splice plates 4, respectively. In this case, field welding is required. In addition, the joining of the steel beams 1A and 1B to the beam brackets 3A and 3B by bolt fastening is not different from that shown in Patent Document 1, and therefore a further improvement effect cannot be expected.

  From the above, this type of composite structure cannot always reduce costs and shorten the construction period, and in order to spread such a composite structure, steel beams are reasonably joined to reinforced concrete columns. It is considered essential to develop effective and appropriate structures.

  In view of the above circumstances, the present invention is a structure of a composite structure composed of reinforced concrete columns and steel beams, and among the steel beams in both directions joined to the joint, the steel beam in one direction has an intermediate portion thereof. The steel beam in the other direction is joined to the joint, and the end of the steel beam in the other direction is joined to the joint, and a bearing plate for transmitting the bending moment to the joint is attached to the end of the steel beam in the other direction. It is provided in a state of being opposed to the side portion of the steel beam in the direction, and a reinforcing steel plate for restraining the deformation is attached to the joint portion.

  In the present invention, it is preferable that the steel beam in both directions is a continuous beam having a length corresponding to two spans, a bearing plate is provided at both ends, and the continuous beams are installed by alternately changing the direction.

  According to the present invention, the steel beam in one direction passes through the joint portion, and the steel beam in the other direction has the bearing plate provided at the end thereof opposed to the side portion of the steel beam in one direction. By placing concrete and integrally forming the reinforced concrete column and the joint portion, the reinforced concrete column and the steel beam in both directions are naturally joined together at the joint portion to be structurally and reliably integrated. The bending moment acting on the steel beam in the other direction is reliably transmitted to the joint through the bearing plate, and the joint resists the bending moment by the bearing reaction force and The attached reinforced steel plate restrains the deformation, thereby sufficiently ensuring the strength of the joint. Therefore, according to the present invention, when joining a reinforced concrete column and a steel beam, there is no need to use a special and complicated joint structure as in the prior art, and the bolt fastening operation as well as the welding operation is omitted or greatly reduced. Therefore, the working efficiency can be greatly improved as compared with the conventional case.

  If both steel beams in both directions are connected to each other as long as two spans, pressure bearing plates are installed at both ends, and the connecting beams are installed alternately in different directions, the members can be shared and installed. The construction efficiency can be further improved by simplifying the construction.

  One embodiment of the present invention is shown in FIGS. FIG. 1 shows a joint (column beam joint) in the structure of the present embodiment. As shown in FIGS. 1 (a) and 1 (b), a steel beam 1A in one direction passes through the joint. The steel beam 1B in the other direction is joined to the joint portion as a beam, and an end plate that functions as a bearing plate 5 is provided at the end of the beam so as to protrude above and below the steel beam 1B. The plate 5 is joined to the joint in a state where the plate 5 faces the side of the steel beam 1A in one direction.

  The steel beam 1B in the other direction does not need to be directly joined to the steel beam 1A in the one direction, and when installing it, the level adjustment is performed on the support plate 6 that protrudes forward from the upper part of the end plate 5 It is only necessary to screw the bolt 7 downward and to support the end of the steel beam 1B with the steel beam 1A via the support plate 6 while adjusting the level of the steel beam 1B with the level adjusting bolt 7.

  As described above, the steel beams 1A and 1B in both directions are installed, the reinforcing steel plate 8 also serving as a mold is attached to the joint portion, and concrete is integrally cast inside the column mold (not shown) and the reinforcing steel plate 8. When the reinforced concrete column 2 and the joint portion are integrally formed, the steel beams 1A and 1B in both directions are joined to the joint portion in a state of being integrated with each other, and the reinforced concrete column 2 and the steel beams 1A and 1B are joined together. A composite structure is constructed.

  The reinforcing steel plate 8 is preferably provided so as to cover the entire joint portion. For example, as shown in FIG. 2A, three strip steel plates are wound in three stages while avoiding the positions of the flanges of the steel beams 1A and 1B. It is preferable to wind the steel sheet in which notches corresponding to the shapes of the steel beams 1A and 1B are formed as shown in FIG. In addition, the reinforcing steel plate 8 may be appropriately connected and wound, or may be attached to the steel beams 1A and 1B in advance. In any case, when placing concrete, it is preferable to prevent leakage of the concrete by appropriately closing the gap remaining between the reinforcing steel plate 8 and the steel beams 1A and 1B.

  According to the above structure, the steel beams 1A and 1B in both directions are not directly joined to each other, but they are securely and firmly joined to each other through the concrete of the joint portion without any structural problems. Moreover, as shown in FIG. 1 (b), the bending moment M acting on the steel beam 1B is reliably transmitted to the joint portion through the end plate 5 as a bearing plate, and the joint portion is used as its reaction force. The reinforcing steel plate 8 that resists the bending moment M by the bearing reaction P acting on the top and bottom of the end plate 5 and that is mounted around the end plate 5 exhibits a confining effect that restrains deformation of the joint, thereby The strength of the joint is sufficiently secured.

  Therefore, according to the above structure, there is no need to use a special and complicated joint structure as in the prior art, and in the construction, the end of the steel beam 1B is simply supported with respect to the steel beam 1A. Since the bolt fastening work as well as the welding work can be omitted or greatly reduced, the work efficiency can be greatly improved as compared with the prior art.

  In the present invention, the construction of the steel beams 1A and 1B in both directions is arbitrary as long as the joint portion has the above-described structure, but when the spans in both directions are equal, FIG. As shown in the figure, the steel beams 1A and 1B in both directions are connected to each other as two-span continuous beams, and end plates 5 are provided at both ends thereof. It is preferable to construct the beams 1A and 1B. In this case, the steel beams 1A and 1B in both directions are joined at the center portion thereof through the joint portion, and both end portions thereof are joined to other adjacent joint portions. Steel beams can be used in the same shape and dimensions, and all joints can be made in the same form. It is possible to further improve the construction efficiency.

  However, the above embodiment is merely an example, and the present invention is not limited to the above embodiment. For example, in the above embodiment, when the steel beam 1B in the other direction is installed, the end thereof is supported by the support plate 6 and the level adjusting bolt 7 with respect to the end of the steel beam 1A in one direction, and the level adjustment is performed. However, since this is only temporary support until the concrete is placed, the support plate 6 and the level adjusting bolt 7 may be omitted, and temporary support may be performed by other appropriate methods. The reinforcing steel plate 8 may be any material as long as it can restrain deformation of the joint, and for example, a steel pipe may be adopted. Of course, the reinforced concrete column is not limited to a square cross section, and may have a circular cross section.

  In addition, as shown in FIG. 3, it is preferable to adopt a continuous beam having the same shape and the same size as the steel beams 1A and 1B in both directions, and adopt them by alternately changing the directions, but not limited thereto. Of course, the construction pattern of the steel beams 1A and 1B in both directions may be freely set according to the planar shape of the building. For example, in the case of a building that is long in one direction, only the steel beam in the beam direction is connected as a continuous beam, and the intermediate part is joined to the joint as a steel beam in one direction, and the beam in the span direction is a single span beam. It is conceivable that the end of the steel beam 1B in the other direction is joined to the joint as the steel beam 1B in the other direction.

The joint part in the composite structure which is embodiment of this invention is shown, (a) is a plane sectional view, (b) is an elevational sectional view. It is a figure which shows the external appearance of a joint part. It is a figure which shows the construction state of a steel beam. An example of the joint part in the conventional composite structure is shown, (a) is a plane sectional view, (b) is an elevational sectional view.

Explanation of symbols

1A steel beam (one-way steel beam)
1B Steel beam (Steel beam in other direction)
2 Reinforced concrete columns 5 End plate (supporting plate)
6 Support plate 7 Level adjustment bolt 8 Reinforced steel plate

Claims (2)

  It is a building structure with a composite structure of reinforced concrete columns and steel beams. Among the steel beams in both directions to be joined to the joint, one-way steel beam joins the middle part to the joint, and others One end of the steel beam in the direction is joined to the joint, and the end of the steel beam in the other direction is opposite to the side of the steel beam in one direction to transmit the bending moment to the joint. The building structure is characterized in that it is provided in a state of being attached and a reinforcing steel plate for restraining the deformation is attached to the joint.   The structure of the building according to claim 1, wherein each of the steel beams in both directions is a continuous beam having a length corresponding to two spans, a bearing plate is provided at both ends thereof, and the continuous beams are installed by alternately changing directions. The structure of the building.

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