JP2008174924A - Fixing structure of support leg part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fixing structure of a support leg part capable of increasing the rupture strength of a support to be vertically installed. <P>SOLUTION: This fixing structure of a support leg part for installing a support for installing a handrail or a fence by vertically installing on a rooftop. veranda, a floor slab comprises a channel member having a main wall surface and second and third wall surface disposed at right angle and opposite to each other on the both end sides of the main wall surface of a channel shape in cross section and two deformed reinforcement members welded to the outer sides of the second and third wall surfaces of the channel member. The deformed reinforcement members project by a predetermined dimension from the channel member in the longitudinal direction. Consequently, since the adhesive force thereof to the concrete of the vertically installed support is increased, the rupture strength of support can be increased. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a structure for fixing a column leg when standing on a rooftop, a veranda, a floor slab or the like and installing a handrail or a fence.

  In general, when handrails or fences are installed on a rooftop, a veranda, or a floor slab, deformed reinforcing bars are welded to channel members to fix the columns, and embedded column legs are fixed to concrete. For example, as shown in FIG. 5, the deformed reinforcing bars 2 and 2 are welded to the inside of the channel member 1 and used to fix the embedded struts in the concrete. Conventionally, for example, D13 (nominal diameter 12.7 mm) is used as the deformed reinforcing bar and is welded to the inside of the channel member 1.

  However, in the conventional support structure for the column legs, when a load is applied from the lateral direction, cracks are concentrated on the concrete 3 linearly as shown in FIG.

  In order to achieve the above-mentioned object, the invention according to claim 1 is a support structure of a support leg portion that installs a support column for setting up a handrail or a fence on a rooftop, a veranda, a floor slab, etc. A channel member having a main wall and a second wall and a third wall arranged at right angles to both ends thereof and facing each other and having a cross-sectional groove shape, and welded to the outside of the second and third walls of the channel member The deformed reinforcing bar material is formed to protrude in the longitudinal direction from the channel member by a predetermined dimension.

  Further, in the invention according to claim 2, the deformed reinforcing bar material has a name of D16 (nominal diameter 15.9 mm) or more.

  Since this invention consists of an above-described structure, there can exist an effect which is demonstrated below.

  According to the first aspect of the present invention, there is provided a structure for fixing a column leg for installing a column for standing on a rooftop, a veranda, a floor slab or the like and for installing a handrail or a fence, and is perpendicular to the main wall surface and both ends thereof. And a channel member in which the second and third wall surfaces arranged opposite to each other have a groove shape in cross section, and two deformed reinforcing bars welded to the outside of the second and third wall surfaces of the channel member The deformed reinforcing bar material is formed so as to protrude in the longitudinal direction from the channel member by a predetermined dimension, so that when a load is applied, the stress is dispersed without being concentrated, and the concrete breaks into a large lump. Therefore, the proof stress until the stress is dispersed and the housing is broken can be increased.

  In the invention according to claim 2, since the deformed reinforcing bar material has a name of D16 or more, there is no possibility that stress concentration is gently generated on the concrete.

  The present invention comprises two deformed reinforcing bars welded to the outside of the second and third wall surfaces of the channel member arranged opposite to each other, and the deformed reinforcing bars are longitudinally extended from the channel member by a predetermined dimension. Since it is formed to protrude, the affinity with concrete can be increased and the strength can be increased.

  Hereinafter, the present invention will be described in detail with reference to the drawings illustrating an embodiment. FIG. 1 is a perspective view showing an example of a fixing structure for a column leg according to the present invention, FIG. 2 is a longitudinal sectional view showing a usage pattern of the fixing structure for a column leg according to the present invention, and FIG. It is a cross-sectional view. Here, the support structure 10 of the support leg is to install a support for standing on the rooftop, veranda, floor slab, etc., and to install handrails and fences, and is perpendicular to the main wall 11 and both ends thereof. In addition, the second and third wall surfaces 12 and 13 disposed opposite to each other are welded to the channel member 14 having a cross-sectional groove shape and the outside of the second and third wall surfaces 12 and 13 of the channel member 14. The deformed reinforcing bar material 15 is formed so as to protrude from the channel member 14 in the longitudinal direction by a predetermined dimension.

  The channel member 14 has a screw hole 16 for fixing the support material at a predetermined position. Further, the deformed reinforcing bar material 15 is welded to the outside of the second and third wall surfaces along the longitudinal direction of the channel member 14. By welding to the outside of the second and third wall surfaces, the moment to resist when receiving a load from the lateral direction is increased, and it becomes possible to fix the column firmly. For example, when the width of the channel member 14 is H = 40 mm and t = 3.2 mm, when the deformed reinforcing bar material of D13 is welded to the inside of the channel member, the distance between the shaft centers of both deformed reinforcing bars is 40 −12.7−6.4 = 20.9 mm, but when the deformed reinforcing bar material of D19 is welded to the outside of the channel member, the distance between the axes of both deformed reinforcing bars is 40 + 19.1 = 59.1 mm. It becomes about 2.8 times or more. Moreover, it is desirable that the deformed reinforcing bar material 15 has a designation of D16 (nominal diameter 15.9 mm) or more. By setting it as D16 or more, when the affinity with concrete is increased and a load is applied, the stress concentration can be reduced.

  A method of using the support structure 10 for a column leg according to the present invention configured as described above will be described. First, as shown in FIG. 2, the channel member 14 is set at a position where a column such as a rooftop, a veranda or a floor slab is erected, and then concrete is placed. A part of the deformed reinforcing bar 15 is embedded in the concrete, and the lower end surface of the channel member 14 is set to the floor level (FL). After the cast concrete is hardened, the support material 16 is mounted on the channel member 14 and fixed with the tapping screw 17. At this time, the tapping screw 17 can be easily attached by being screwed into a screw hole portion formed in the channel member 14. Further, a cover member 18 is attached to a boundary portion between the support material 16 and the floor slab. The cover member 18 is inserted from above the support member 17 before the tapping screw 17 is attached.

In this way, when a load is actually applied using the support structure of the support leg portion of the present invention, the shape of the crack generated in the concrete block 19 is concentrated around the deformed reinforcing bar 15 as shown in FIG. Since it disperse | distributes without carrying out, the yield strength until a housing breaks can be enlarged. FIG. 7 shows a case where the name D13 is used as the deformed reinforcing bar 15. Compared to the case where the deformed reinforcing bar material is welded to the inside of the second and third wall surfaces, the proof stress is increased.
FIG. 5 shows a case where the designation D16 is used as the deformed reinforcing bar 15. The concrete block 19 is destroyed in a state where a large concrete lump is attached around the deformed reinforcing bar 15. Compared to the case where the name D13 is used, the proof stress is about 1.5 times, which shows a greater effect than the difference in circumference.
Therefore, even if a support is installed at a desired position such as a rooftop, a veranda, or a floor slab, it is possible to install a strong support that is resistant to a falling moment.

  FIG. 4 is a front view showing a usage pattern of the fixing structure of the support leg portion of the present invention. In a present Example, a fence and a handrail are installed in desired positions, such as a floor slab. A channel member 14 is fixed to a predetermined position such as a floor with a deformed reinforcing bar 15, and a column material 16 is attached to the fixed channel member 14 from above and fixed with a tapping screw 17. An upper frame 20 and a lower frame 21 are attached to the column members 16 erected at predetermined intervals. A vertical bar 22 is vertically attached between the upper frame 20 and the lower frame 21. Furthermore, when connecting the edge part of the upper frame 20 and the lower frame 21, and a wall surface or a pillar, it attaches with an anchor bolt using L-shaped metal fittings.

  The present invention is not limited to the above-described embodiments, and various design changes can be made based on the description of the scope of claims.

FIG. 1 is a perspective view showing an example of a fixing structure for a column leg according to the present invention. FIG. 2 is a longitudinal sectional view showing a usage pattern of the fixing structure of the column base. FIG. 3 is a cross-sectional view in the same usage form. FIG. 4: is a front view which shows the usage type of the fixing structure of the support | pillar leg part. FIG. 5 is an explanatory view showing a cracked state of the concrete when a lateral load is applied to the support structure for the column legs. FIG. 6 is a cross-sectional view showing an example of a conventional structure for fixing a column base. FIG. 7 is an explanatory view showing a cracked state of concrete when a lateral load is applied to the conventional support structure for the column legs.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Fixing structure of support | pillar leg part 11 Main wall surface 12 2nd wall surface 13 3rd wall surface 14 Channel member 15 Deformed reinforcement 16 Support material 17 Tapping screw 18 Cover member 19 Concrete block 20 Upper frame 21 Lower frame 22 Vertical beam

Claims (2)

It is a fixed structure of the support legs that are installed on the rooftop, veranda, floor slab, etc.
A channel member in which the second wall surface and the third wall surface which are perpendicular to the main wall surface and both end sides thereof and are arranged to face each other have a cross-sectional groove shape;
It consists of two deformed reinforcing bars welded to the outside of the second and third wall surfaces of the channel member,
The deformed reinforcing bar material is formed so as to protrude in the longitudinal direction from the channel member by a predetermined dimension.   The fixed structure of the column leg part according to claim 1, wherein the deformed reinforcing bar material has a name of D16 or more.

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