JP2012067495A - Slit structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slit structure with improved reliability in terms of strength against a side pressure when placing concrete.SOLUTION: A slit structure 10 provided on a boundary part of a column 12 and a wall 14 of a concrete structure includes: a support member 18 of an almost U-shaped cross section for engaging with and supporting a slit body 16 from both front and rear sides; and a joint bar 20 adjacently arranged at the front and rear of the slit body 16 through the support member 18. The support member 18, the joint bar 20 and a concrete form 22 are fixed by a bolt 24 and a flat nut plate 36, a channel 26 is put along the side face of the slit body 16 in the vertical direction to reinforce the slit body 16, a separator 30 arranged at an interval at the side part of the slit body 16 is made to pass through a reinforcing metal fitting 32, and the reinforcing metal fitting 32 and the slit body 16 are fixed by a connection bolt 34.

Description

  The present invention relates to a slit structure for earthquake resistance provided at a boundary portion between structures such as a joint between a pillar and a wall of a concrete structure.

  Conventionally, in a concrete structure such as a building, a structural slit extending vertically is provided at the boundary between structures, such as a joint between a column and a wall, and structurally divided to reduce damage due to earthquake shaking. Is known (see, for example, Patent Document 1).

  FIG. 4 is a schematic plan sectional view of the slit structure of Patent Document 1. As shown in FIG. 4, the slit structure 1 includes a slit material body 2, support members 3 and 4 having a substantially U-shaped cross section for engaging and supporting the slit material body 2 from both sides, and the support members 3 and 4. And an auxiliary member 5 installed on the frame. The slit material body 2 is attached to the molds 6 and 7 through fixing members 8 and 9 that also serve as joint rods. As a method of fixing the fixing members 8 and 9 to the molds 6 and 7, nailing is generally used. The entire slit including the joint rod is fixed so as to be sandwiched between the slats by fastening the separators that fix the slats. Further, the reinforcing member 5 is installed on the opposite side (for example, the wall side) to the side on which the concrete is first placed (for example, the wall side), and spreads between the support members 3 and 4 due to the side pressure acting at the time of placing. This prevents the slit material body 2 from being deformed or detached.

JP 2002-194920 A

  By the way, in the conventional slit structure, if concrete is poured at a time when the concrete is placed, there is a possibility that the joint rod or the slit material body may bend due to a problem in strength. When such bending occurs, the slit material main body bites into the column side after the concrete is hardened, or the slit material main body is bent left and right. As a countermeasure, there is known a method of placing concrete on both sides of the slit structure alternately, for example, every 1 m in height. However, the construction conditions are complicated and there is a risk that the efficiency of the work is reduced and the procedure is wrong.

  As described above, nailing is generally used as a method for fixing the joint rod. However, there is a problem that the nail cannot be struck straight, which may result in a structure with low strength reliability.

  This invention is made | formed in view of the above, Comprising: It aims at providing the slit structure which improved the strong reliability with respect to the side pressure at the time of concrete pouring, and the defense against bending.

  In order to solve the above-described problems and achieve the object, a slit structure according to claim 1 of the present invention is a slit structure provided at a boundary between a pillar and a wall of a concrete structure, and the slit body is provided from both the front and rear sides. A support member having a substantially U-shaped cross-section to be engaged and supported, and a joint rod disposed adjacent to the front and rear of the slit body via the support member, and the support member, the joint rod, and the concrete form frame are connected to a bolt and a flat plate. It is fixed with a nut plate.

  The slit structure according to claim 2 of the present invention is the slit structure according to claim 1 described above, wherein the slit body is reinforced along the side surface of the slit body along the vertical direction, and the side of the slit body is spaced apart. A separator to be opened is passed through the reinforcing metal fitting, and the reinforcing metal fitting and the slit main body are fixed with a connecting bolt.

  In addition, the slit structure according to claim 3 of the present invention is that in the above-described claim 1 or 2, the bolt for fixing the support member, the joint rod, and the concrete formwork is configured to be removable after placing the concrete. Features.

  A slit structure according to a fourth aspect of the present invention is the slit structure according to any one of the first to third aspects, wherein the grooved steel is vertically aligned with both side surfaces of the slit main body, and the connecting bolt from the reinforcing metal fitting is provided. It is characterized in that it is fixed to the rear channel steel through the slit body.

  Moreover, the slit structure which concerns on Claim 5 of this invention has provided the shock absorbing material in the head of a connection bolt in any one of Claims 1-4 mentioned above.

  According to the present invention, there is a slit structure provided at the boundary between a pillar and a wall of a concrete structure, and a substantially U-shaped cross-section supporting member that engages and supports the slit main body from both the front and rear sides, and via this supporting member It has joint rods arranged adjacent to the front and back of the slit body, and this support member, this joint rod and concrete formwork are fixed with bolts and flat nut plates, so that the strength reliability against the side pressure when placing concrete is improved. There is an effect that it can be increased.

FIG. 1 is a plan sectional view showing an embodiment of a slit structure according to the present invention. FIG. 2 is a partial schematic perspective view of the slit structure. FIG. 3 is a partial schematic perspective view of the reinforcing metal fitting. FIG. 4 is a plan sectional view showing an example of a conventional slit structure.

  Embodiments of a slit structure according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

  As shown in FIG. 1 to FIG. 3, the slit structure 10 according to the present invention is a slit structure provided at the boundary between a pillar 12 and a wall 14 of a concrete structure, and includes a slit body 16 made of polystyrene foam or phenol board, A support member 18 having a substantially U-shaped cross section that engages and supports the slit body 16 from both the front and rear sides, and a joint rod 20 disposed adjacent to the slit body 16 via the support member 18 are provided. The support member 18, the joint rod 20, and the slat plate 22 (concrete formwork) are fixed by bolts 24 and a flat nut plate 36. As described above, the joint rod 20 can be prevented from being bent by fixing it with the bolt 24 and the flat nut plate 36 having high rigidity and strong fixing force without using nails. The bolt 24 is configured to be removable after placing concrete.

  In addition, groove steel 26 is provided on the left and right side surfaces of the slit body 16 along the vertical direction. In the grooved steel 26, the outer surface of the web faces the side surface of the slit body 16, and the flange portion acts as a rib, so that the bending rigidity against the side pressure at the time of placing concrete can be increased.

  Although the grooved steel 26 depends on the floor height, for example, it rises from the floor surface and is installed in a range of about 1 to 3 m in height of the slit body 16. In this way, the rigidity of the slit body 16 is increased, and even if concrete is placed on only one side of the column 12 and the wall 14 up to a height of about 4 m at a time, the slit is caused by the lateral pressure at the time of placement. It is possible to prevent the main body 16 from bending left and right.

  In addition, the grooved steel 26 can be disposed so as to cover the upper layer somewhat across the seam between the upper and lower layers so that the upper slit body installed on the slit body 16 can be supported. For example, the length of the cover may be set to about 5 cm so as to strengthen the strength of the lower end of the upper slit body.

  In addition, a separator 30 with a nut 28 is disposed on the side of the slit body 16 with a gap therebetween. The separator 30 penetrates the reinforcing metal fitting 32. Specifically, the reinforcing metal fitting 32 includes an angle steel 38 and end plates 40 attached so as to cover both ends thereof, and the separator 30 penetrates the end plates 40. The side portion of the angle steel 38 of the reinforcing metal fitting 32 and the slit main body 16 are fixed by connecting bolts 34 extending left and right. Thereby, it is possible to resist the compression force and the pulling force in the left-right direction applied to the slit main body 16, and it is possible to enhance the strength reliability against the side pressure at the time of placing concrete. In addition, the reinforcing metal fitting 32 is not limited to this form, and a form using a grooved steel instead of the angle steel 38 may be used.

  Further, the connecting bolt 34 is composed of a convex portion 34a whose outer peripheral surface is threaded and a concave portion 34b whose inner peripheral surface is threaded. The convex portion 34 a enters from the grooved steel 26 on the column 12 side, penetrates the slit main body 16, and is screwed into the concave portion 34 b of the connecting bolt 34 extending from the reinforcing bracket 32. Here, when the wall 14 side is pushed by an earthquake, the movement of the separator 30 pushes the connecting bolt 34 via the reinforcing metal fitting 32. In this case, the head 34c of the projection 34a of the connecting bolt 34 exposed from the channel steel 26 on the column 12 side may rub against the surrounding concrete to generate cracks. A cushioning material (not shown) or the like can be sprayed, or a solid cushioning material can be attached, for example.

  In addition, it is preferable to set the vertical arrangement interval of the bolts 24 for fixing the joint rods 20 and the vertical arrangement interval of the separators 30 provided with the reinforcing metal fittings 32 at an appropriate interval with no problem in construction. It is desirable to set an optimum interval as appropriate by conducting a strength experiment or the like.

Next, the effect obtained by the slit structure 10 of the present invention will be described.
(1) Since the joint rod 20 is fixed with the bolts 24, the fixing can be performed more stably than the conventional fixing by nailing, and the strength reliability of the slit structure can be enhanced.
(2) By lateral reinforcement by the separator 30, it is possible to effectively counter the lateral load applied to the slit structure.
(3) By disposing the grooved steel 26 on the side surface of the slit body 16, the side surface of the slit body 16 can be reinforced.
(4) Since the reinforcing metal fitting 32 has a structure through which the separator 30 penetrates, the slit main body 16 can be reliably reinforced from the side via the connecting bolt 34 without being detached during construction.

  Due to the four effects (1) to (4), it is possible to ensure strength without problems in construction, and to ease the construction conditions. For this reason, for example, even if concrete having a height of about 4 m is placed on the column side at once, the bending of the slit body 16 due to the side pressure can be prevented.

  As described above, according to the present invention, the slit structure provided at the boundary between the pillar and the wall of the concrete structure, the support member having a substantially U-shaped cross section for engaging and supporting the slit main body from both the front and rear sides, There are joint rods arranged adjacent to the front and rear of the slit body through the support member, and the support member, the joint rod and the concrete formwork are fixed with bolts and a flat nut plate. Strength reliability can be improved.

  As described above, the slit structure according to the present invention is useful for a seismic slit structure provided at a boundary portion between structures such as a joint between a pillar of a concrete structure such as a building and a wall, and in particular, concrete striking. It is suitable for enhancing the strength reliability against the lateral pressure during installation and the protection against bending.

DESCRIPTION OF SYMBOLS 10 Slit structure 12 Column 14 Wall 16 Slit main body 18 Support member 20 Joint rod 22 Slat board (concrete formwork)
24 Bolt 26 Grooved Steel 28 Nut 30 Separator 32 Reinforcement Bracket 34 Connection Bolt 36 Flat Nut Plate 38 Angle Steel 40 End Plate

Claims (5)

A slit structure provided at the boundary between a pillar and a wall of a concrete structure,
A substantially U-shaped cross-section support member that engages and supports the slit main body from both front and rear sides, and a joint rod that is disposed adjacent to the front and rear of the slit main body via this support member,
A slit structure in which the support member, the joint rod, and the concrete form are fixed with bolts and a flat nut plate.   Reinforce the slit body by placing a grooved steel along the vertical direction on the side of the slit body, and penetrate the reinforcing bracket through a separator that is spaced apart from the side of the slit body, and connect this reinforcement bracket to the slit body. The slit structure according to claim 1, wherein the slit structure is fixed with a bolt.   The slit structure according to claim 1 or 2, wherein the bolt for fixing the support member, the joint rod, and the concrete form is detachable after the concrete is placed.   The grooved steel is vertically aligned with both side surfaces of the slit body, and the connecting bolt from the reinforcing bracket is fixed to the grooved steel on the back side through the slit body. The slit structure as described in one.   The slit structure according to any one of claims 1 to 4, wherein a buffer material is provided on a head portion of the connecting bolt.

Images