JP4134319B2 - Scaffolding bracket - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a suspension bracket for a temporary scaffold of a steel / concrete composite structure such as a bridge or a building. More specifically, the present invention provides a hanging bracket that can also be used as another member without using welding.
[0002]
[Prior art]
For steel / concrete composite structures (also called steel / concrete composite structures) such as bridges and buildings, after constructing the steel structure of the main structure, a suspension scaffolding, etc. will be provided for reinforcement, formwork, concrete Perform construction work.
[0003]
In general, the suspension brackets for scaffolds provided in these steel structures are generally attached to the side surfaces of the steel girders, the lower surfaces of the upper flanges, and the like by welding.
[0004]
A main steel girder member such as a main girder to which the scaffolding bracket is attached has a large stress, and fatigue damage may occur starting from a welded portion with the scaffolding bracket. For this reason, fatigue check of this part is performed at the time of design. As a result, if it is determined that fatigue damage will occur, it is necessary to change the finishing method of the welded part or to review the thickness of the main steel girder member. In that case, there is a problem that the design and production of metal fittings other than welding have problems such as complicated structure and increased man-hours for production, and the review of the plate thickness of the main steel girder member increases the quantity of steel materials. There's a problem. Any of these means is problematic in that it leads to an increase in production cost.
[0005]
For example, a suspension frame scaffolding that has hooks that engage with both edges of the lower flange of an H-shaped steel and that can change the distance between the hooks and the size of the hook opening according to the size and thickness of the H-shaped steel. There is a mounting bracket (see, for example, Patent Document 1).
[0006]
This technology relates to a mounting bracket for a suspension frame scaffold for working at a stage until a floor is formed inside a construction site where a steel beam such as H-shaped steel is assembled. This is a hanging frame scaffold mounting bracket that can be easily and reliably locked to an H-shaped steel flange in accordance with the thickness dimension. The specific contents are:
(A) The lower side is joined to form a connecting hole, and the upper side is spaced apart from the first and second frames to form the insertion portion, and slides laterally within the insertion portion, and the position is regulated by a stopper. A pair of hooks, a hook shaft that is erected on the outer end of each hook and screwed into the inner side of the upper end, and a downward U-shape that passes through the bolt and whose vertical position is regulated by a nut And a deformed polygonal cam plate fixed to both ends of the cam shaft that penetrates the inner side of the cam case in the width direction,
(B) A guide hole is drilled in the length direction of the hook, and an engagement pin projects from the lower side of the inner end.
(C) Fastening a bolt that penetrates the guide hole at both ends of the insertion portion, and forming an engagement hole for introducing the engagement pin in the lower length direction of the insertion portion; and Insert a screw in the center of the front of the insertion part,
(D) A long hole that penetrates the screw is formed in the central portion of the stopper, and a corrugated locking portion that fits an engaging pin is formed on the lower surface of the stopper. It is the attachment bracket of the suspension frame scaffold which screwed together and fixed the stopper.
[0007]
Such mounting brackets have a complicated structure and a large number of parts, and it is not easy to perform field work for mounting and dismounting.
[0008]
Moreover, in the structure which installs concrete members, such as a floor slab, in a main steel girder member, the reinforcing bar for a slip prevention which bent the reinforcing bar is provided in the upper flange side of a girder. In the conventional structure, the above-mentioned suspension fitting and the anti-slip bar are separate members and are attached separately.
[0009]
[Patent Document 1]
Japanese Unexamined Patent Publication No. 4-120366 (page 2-5, FIG. 1)
[0010]
[Problems to be solved by the invention]
The present invention provides a suspension bracket for a temporary scaffold of a steel / concrete composite structure, which eliminates the trouble caused by using welding and provides a suspension bracket that can be used with other members with a simple structure. With the goal.
[0011]
[Means for Solving the Problems]
The present invention has been made in order to solve the above-described problems, and in a suspension bracket for a temporary scaffold of a steel / concrete composite structure, a screw is attached to a reinforcing rod for concrete slipping embedded in concrete without using welding. A scaffolding bracket characterized by being processed, the slip-preventing reinforcing bar is inserted into a hole of a steel girder member, and a suspension bracket is detachably coupled to the screw .
[0012]
The present invention takes a means for coupling the hanging bracket using the mounting nut of the anti-displacement reinforcing bar that has been threaded, and connects the reinforcing bar connected to the hanging bracket to the surface where the main steel girder member and the concrete are in contact with each other. It is made to project and serves as both a scaffolding bracket and a steel / concrete retaining bar.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, the suspension metal fitting and the main steel girder member are joined by joining with a nut through a member in which the reinforcing bar is threaded, and welding between the suspension fitting and the main steel girder member is eliminated. It is possible to have a function as a steel-concrete reinforcing bar by cutting off the source of fatigue damage caused by the steel and projecting the reinforcing bar connected to the hanging bracket to the concrete contact surface of the main steel girder member Become.
[0014]
Embodiments of the present invention will be described below with reference to the drawings. First, the prior art will be described. FIG. 4 shows the main steel girder member 1 with a hanging metal fitting 41 attached to the lower surface of the upper flange 2 and the side surface of the web 3 by welding 42. In FIG. 5, a hanging metal fitting 43 is attached to the side surface of the web 3 of the main steel girder member 1 by welding 44. When the main steel girder member 1 is repeatedly exposed to a high stress state for a long period of time, cracks may occur in the heat-affected portions of the welds 42 and 44, which may cause trouble.
[0015]
FIGS. 6A and 6B are views showing a concrete displacement prevention reinforcing bar 51 attached to the upper surface of the main steel girder member 1. FIG. 6A is a plan view and FIG. 6B is a side view. The rebar 50 is attached to the upper surface of the upper flange 2 of the main steel girder member 1 by welding 52, and is placed along the upper surface of the upper flange 2 when the main steel girder member 1 is transported. Both ends are pulled up as indicated by arrows 53 and embedded in concrete.
[0016]
1 to 3 show an embodiment of the present invention, FIG. 1 is an exploded view, FIG. 2 is an explanatory view showing a use state, and FIG. 3 is a perspective view of a bracket 21.
[0017]
As shown in FIG. 2, a concrete slab 5 is constructed on the upper surface of a main steel girder member 1 composed of an upper flange 2, a web 3 and a lower flange 4. Temporary work scaffolding 32 is provided for rebar assembly, formwork attachment, concrete placement, formwork removal, and other operations of the concrete floor slab 5. A hanging metal fitting 20 is provided to which a hanging material 31 or the like for hanging the temporary work scaffold 32 is attached.
[0018]
As shown in FIG. 1, the hanging bracket 20 of the embodiment includes a hanging bracket 21, a reinforcing bar 11 with a threaded end, a nut 23 for fixing the hanging bracket 21, and a washer 22.
[0019]
In implementation, in order to let the reinforcing bar 11 which acts as a slip prevention of the concrete floor slab 5 pass, the hole 7 for insertion is made beforehand in the upper flange 2 of the main girder. On the other hand, the suspension bracket 21 is manufactured from a shape steel or a steel plate, and is provided with a hole 24 for penetrating the reinforcing bar 11 and allows a suspension member 31 such as a chain for suspending a scaffold 32 to pass therethrough like a conventional suspension bracket. The hole 25 is opened. The rebar 11 has a screw 12 processed at the tip.
[0020]
The nut 13 and the washer 14 are inserted into the screw 12 and the reinforcing bar 11 is passed from above to below through the hole 7 provided in the upper flange 2. At this stage, the threaded portion 12 of the reinforcing bar 11 protrudes from the lower surface of the upper flange 2. The suspension bracket 21 and the washer 22 are inserted into this portion, and the suspension bracket 21 is fixed to the main steel girder member 1 by tightening the nut 23, and the operation is completed.
[0021]
The rebars, nuts, washers, and suspension metal fittings attached to the main girder do not require welding, and can be handled at any stage during factory production or on-site construction.
[0022]
【The invention's effect】
According to the present invention, a suspension bracket and a main steel girder member are coupled via a threaded reinforcing bar and a nut so as to function as a suspension bracket, and the reinforcing bar connected to the suspension bracket is used as a main steel girder member. By projecting from the upper flange upper surface concrete and contact surface, it became possible to have a function as a steel / concrete rebar preventing steel bar. Also, in terms of manufacturing, the scaffolding metal fittings and the anti-slip rebar can be attached to the main steel girder member at once by simply tightening the nuts, thereby improving manufacturability. Since the bracket is detachable, it can be used repeatedly. In the case of a steel reinforced concrete structure (SRC structure), the hanging bracket may be embedded in the concrete and used as a slip stopper or the like. Furthermore, since no welding is used for the main steel girder member and the reinforcing bar, and the main steel girder member and the suspension bracket for the scaffolding, it was possible to achieve a structure in which fatigue damage caused by the welded portion does not occur.
[Brief description of the drawings]
FIG. 1 is an assembly explanatory view showing the structure of an embodiment.
FIG. 2 is an explanatory diagram showing application of the present invention.
FIG. 3 is a perspective view of a bracket.
FIG. 4 is an explanatory view of conventional bracket mounting.
FIG. 5 is an explanatory diagram of conventional bracket mounting.
FIG. 6A is a plan view and FIG. 6B is a side view showing an example of slip prevention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Main steel girder member 2 Upper flange 3 Web 4 Lower flange 5 Concrete floor slab 7 Hole 11 Reinforcement 12 Screw 13 Nut 14 Washer 20 Suspension bracket 21 Suspension bracket Bracket 22 Washer 23 Nut 24 Hole 25 Hole 31 Suspension material 32 Temporary work scaffold 41 Suspension fitting 42 Welding 43 Suspension fitting 44 Welding 51 Reinforcing bar 52 Welding 53 Arrow

Claims (1)

In the suspension brackets for temporary scaffolds of steel / concrete composite structures, without using welding, threading is applied to the concrete reinforcing bars embedded in the concrete , and the reinforcing bars are inserted into the holes of the steel girder members. A suspension bracket for a scaffold , wherein a suspension bracket bracket is detachably coupled to the screw .

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