JP2008190296A - Bar arrangement structure of reinforced concrete wall - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bar arrangement structure of a reinforced concrete wall which can secure proof stress with reliability, which can securely reduce cracking, and which can perform reinforcement effectively and securely when reducing the amount of reinforcing iron bars and reducing the proof stress and cracking of a wall structure by the combination of wall main reinforcing iron bars and welded wire meshes. <P>SOLUTION: In the bar arrangement structure of the reinforced concrete wall, the wall main reinforcing iron bars 2a, 2b and the welded wire meshes 3a, 3b are arranged in combination with each other. The wall main reinforcing iron bars 2a, 2b are arranged in a step in all directions in the vicinity of the center of a wall thickness, and the welded wire meshes 3a, 3b are each arranged on both surfaces of a structural wall 1 while securing covering thickness. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a bar arrangement structure of a reinforced concrete wall.

  In the case of a wall structure that supports a structure with only walls without using columns or beams as the structure of the building, the reinforcement structure of the reinforced concrete wall is important. For example, as shown in FIG. 2, the main reinforcing bars 5a and 5b are arranged in a vertical and horizontal lattice shape, and a plurality of stages, usually two stages of reinforcing bars are provided at intervals according to the wall thickness. The bars are arranged in parallel.

  In such a wall bar arrangement structure, for example, in the case of a wall thickness of 180 to 230 mm, the reinforcing bar diameter is 10 to 16 mm, and they are arranged at a pitch of 150 to 200 mm.

  And by such 2 structure (double) arrangement | positioning which assembled the reinforcing bars 5a and 5b vertically and horizontally, it bears both the structural strength load required for a wall structure, and a crack reduction. In this case, the diameter of the reinforcing bars does not have to be large in terms of structural strength, but the distance between the reinforcing bars becomes considerably small in order to reduce cracks. As a result, the amount of reinforcing bars reaches a considerable amount as a whole.

  In addition, the joint depth of the induction joint for generating cracks in a concentrated manner is required to be about one-fifth of the wall thickness.

  Therefore, in order to eliminate such inconvenience, instead of having both the structural load bearing and the crack control load played by the same wall bars, the load bearing load is supported by the large diameter reinforcing bars and the crack control load is loaded by the mesh bars. (See, for example, Patent Document 1 below).

In this method, the main reinforcing bars (large-diameter reinforcing bars) arranged near the center of the wall thickness are arranged so that the welded wire mesh (mesh bars) is attached.
Japanese Patent Laid-Open No. 2002-30751

  The invention described in Patent Document 1 has a structure in which the welded wire mesh is superposed on the wall main reinforcement arranged near the center of the wall thickness, so that the welded wire mesh effective for preventing cracks on the concrete surface is arranged at a position away from the wall surface. Therefore, there is a possibility that the reinforcing effect against cracks is not sufficiently exhibited.

  The present invention eliminates the inconveniences of the conventional example, while reducing the amount of reinforcing bars and ensuring the proof strength when trying to reduce the proof strength and cracking of the wall structure with the combination of the main wall reinforcement and the welded wire mesh. In addition, the present invention provides a reinforcing structure of a reinforced concrete wall that can reliably reduce cracks.

  According to the first aspect of the present invention, in the reinforcing structure of the reinforced concrete wall arranged by combining the wall main reinforcement and the welded wire mesh, the wall main reinforcement is arranged vertically and horizontally in the vicinity of the center of the wall thickness, and the covering thickness is secured. The gist is that the welded wire meshes are respectively arranged on both surface sides of the wall.

  According to the first aspect of the present invention, since the wall main reinforcing bars are only arranged in the vicinity of the center of the wall thickness, the structural strength can be secured while reducing the amount of reinforcing bars, and the welded wire mesh has both wall thicknesses. Since it is arranged on the side, cracks can be effectively reduced. The amount of reinforcing bars is calculated by adding up the cross sections of the wall main bars and the welded wire mesh.

  As described above, the reinforcement structure of the reinforced concrete wall according to the present invention can ensure both yield strength and crack reduction with a small amount of reinforcement.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional plan view showing an embodiment of a reinforced concrete wall bar arrangement structure according to the present invention. As an example, the present invention is applied to a structural wall 1 having a wall thickness of 180 to 230 mm.

  In order to bear the proof stress of the structural wall 1, the wall main bars 2a and 2b are arranged in a grid pattern in the vertical and horizontal directions near the center of the wall thickness. In this case, the diameter of the wall main bars 2a and 2b is, for example, about 13 to 16 mm, and the bars are arranged at a pitch of 200 to 300 mm.

  While securing the covering thickness on both sides of the wall main bars 2a and 2b, the welded wire meshes 3a and 3b are respectively arranged on both surface sides of the structural wall 1. The welded wire meshes 3a and 3b use small-diameter iron wires.

  As a result, the wall bars are constructed in three planes, the main wall bars 2a and 2b for structural strength are mainly arranged at the center, and the small welded wire meshes 3a and 3b for reducing cracks are mainly arranged on both sides of the wall thickness. In addition, cracks can be effectively reduced.

  Therefore, both the yield strength and crack reduction can be reliably realized with a small amount of reinforcing bar, and the cross section of the reinforcing bar cross section (rebar amount) is calculated by combining the cross sections of the wall main bars 2a, 2b and the welded wire meshes 3a, 3b. Can be reinforced.

It is a cross-sectional top view which shows embodiment of the reinforcement structure of the reinforced concrete wall of this invention. It is a cross-sectional top view which shows embodiment of the reinforcement structure of the conventional reinforced concrete wall.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Structural wall 2a, 2b Wall main reinforcement 3a, 3b Welded wire mesh 5a, 5b Rebar

Claims (1)

  In the reinforcement structure of a reinforced concrete wall that is arranged by combining a wall reinforcement and a welded wire mesh, the wall reinforcement is placed one step vertically and horizontally in the vicinity of the center of the wall thickness, and the welded wire mesh is provided on both surface sides of the wall while ensuring the covering thickness. Reinforced concrete wall bar arrangement structure characterized by the arrangement of

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