JP2011001806A - Post-construction anchor of handrail for preventing fall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem wherein large cross sectional area of a handrail support column part is necessary to improve performance of horizontal load resistance and a large hole corresponding to the area must be drilled in concrete in a mounting part for construction in a post-construction method for an aluminum handrail or the like.SOLUTION: The anchor is formed by fixing flat-bar steel or round steel having large section modulus on an end part of a support column reinforcing pipe by welding it, and area of the hole to be drilled in concrete surface is reduced.

Description

The present invention relates to a fall-preventing handrail installed on a balcony, corridor, rooftop, stairs, etc. of a concrete building.

Currently, the installation method of aluminum fall prevention handrails at construction sites such as condominiums is the post-installation method in which holes are drilled on the concrete body surface with a hammer drill or diamond core drill, etc., and the foot of the handrail post is fixed with epoxy adhesive. Yes.

An important performance of the fall-preventing handrail is the horizontal load resistance. In order to improve the horizontal load resistance of the handrail, it is necessary to improve the cross-sectional performance of the handrail strut foot portion embedded in the concrete frame portion. However, the increase in the cross-sectional area of the column for improving performance means that a large and deep hole must be drilled in the concrete frame, and it has become a considerable labor for the craftsman who installs the handrail. In addition, it has been difficult to avoid interference with the reinforcing bars (rebars) inside the frame.

Means to solve the problem

In order to solve the above problems, a strut reinforcing core material having a structure as shown in FIG. 1 is prepared.
Flat steel and round steel parts welded and fixed to the end of the steel pipe are buried and bonded inside the concrete frame. A steel pipe of this structure is used as a support reinforcing core, and an aluminum handrail support is inserted and fixed with screws to stand upright.

The invention's effect

By using this strut-reinforced core material, there is no need to drill a large-diameter hole with a diamond core drill or the like. The horizontal load resistance of the handrail was improved by increasing the section modulus as much as possible by using flat steel or the like for the part embedded in the frame.

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiments of the present invention will be described with reference to the drawings. In accordance with the handrail construction drawing, the center of the handrail is placed near the center of the frame, and the holes for drilling are marked at each column position (Fig. 2). A drill bit of an appropriate diameter is attached to the hammer drill, and three holes with a cover thickness of about 40 to 50 mm from the internal reinforcement are drilled (Fig. 3). Next, the perforated hole is broken and enlarged so that the anchor portion of the strut reinforcement is inserted (FIG. 4). Furthermore, deep drilling is performed at a position where it does not interfere with the bar arrangement inside the frame so that the anchor portion of the column reinforcing material is inserted (FIG. 5). The reason why the round steel part is longer than the flat steel part is to avoid the interference with the reinforcing bars (reinforcing bars) and to obtain the necessary embedding depth. Example of avoiding interference with the bar arrangement (FIG. 6).

A column reinforcing material (FIG. 1) is erected in the hole thus drilled (FIG. 7), and the column corner pipe portion of the aluminum handrail body is inserted and jointed (FIG. 8). Next, insert the wedge (C in Fig. 9) between the aluminum handrail column and the upper surface of the frame and adjust the level and level it out. The handrail body is fixed with screws and integrated (B in FIG. 9). An epoxy adhesive is injected from the gap between the feet of the handrail struts, and the handrail is finally fixed (G in FIG. 10). When it is confirmed that the adhesive has hardened, the temporary fixing post is removed and the construction is completed.

Perspective view of anchors and anchors of the product of the present invention Ink drawing guidelines for handrail attachment Outline of drilling with a hammer drill Outline of drilling with a hammer drill Outline of drilling with a hammer drill Example of avoiding interference with reinforcing bars (rebars) inside the concrete frame (a) Example of the handrail-attached core being displaced inward from the center of the chassis (b) Handrail-attached core being displaced from the center of the chassis Example Construction diagram of handrail body Construction diagram of handrail body Construction diagram of handrail body Epoxy adhesive injection diagram

1 42.7φ × 2.3 Steel pipe 2 FB-12 × 25
3 12φ round steel W Strut span dimension A Handrail core ink B Screw fixing the handrail main body and strut reinforcement anchor C Level adjustment wedge D Temporary anchoring pillar E Anchor pillar anchoring anchor

Claims (1)

  Post-installed anchor for standing up the handrail support for the handrail in the shape of flat steel and round steel welded to the inner end of the steel pipe

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