JP2004027658A - Bracket for temporary work scaffolding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make an advantage of construction by a slip form construction method effective without disturbing construction based on the slip form construction method by the installation of a temporary work scaffolding in installing the temporary work scaffolding in the case of constructing a tower-like concrete structure using the slip form construction method. <P>SOLUTION: This bracket 9 fixed to the concrete structure to install the temporary work scaffolding during construction of the concrete structure is composed of a fixed arm 11 fixed to the concrete structure so as to be able to pass through a clearance between an existing work scaffolding and a concrete wall surface of the structure; a supporting arm 12 with the end part rotatably fitted to the upper end of the fixed arm 11; and a stay 13 with the end part rotatably fitted to the lower end of the fixed arm 11. The other end of the stay 13 is slidably engaged with an oblong hole 12a formed in the supporting arm 12, and the supporting arm 12 and stay 13 are combined in a flatly foldable state to the fixed arm 11. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a bracket for fixing a temporary work scaffold temporarily provided on a wall surface of a concrete structure during construction of the concrete structure.
[0002]
[Prior art]
When constructing tower-shaped concrete structures such as chimneys or silos, or when constructing reinforced concrete main towers for cable-stayed bridges or suspension bridges, at each construction stage, for example, scaffolds for installing tower cranes to walls, work passages, etc. It is necessary to provide many temporary work scaffolds.
[0003]
In order to install such a temporary work scaffold, conventionally, at a stage where the structure is completed to some extent, a method of fixing a bracket using an anchor embedded in concrete and laying a scaffold plate on this bracket is known. General.
[0004]
By the way, slip form (sliding formwork) methods are often used not only when constructing tower-shaped concrete structures, but also when constructing reinforced concrete towers for bridges, in order to shorten the construction period. ing.
[0005]
In the slip form (sliding formwork) method, the formwork 2 is continuously moved (for example, for one hour) while the concrete constituting the concrete structure 1 is continuously cast in layers as shown in FIG. This is a construction method in which the construction period is shortened, and a structure that does not generate a seam can be constructed. In the figure, reference numeral 3 denotes a reinforcing rod, and 4 denotes a climbing rod for raising the formwork 2.
[0006]
In the figure, reference numeral 5 denotes a main working scaffold, which is fixed to the formwork 2 by a main yoke material 6 and a yoke channel 7. Then, the plastering scaffold 8 is installed below the main working scaffold 5, and the main working scaffold 5 and the plastering scaffold 8 rise following the rise of the formwork 2.
[0007]
[Problems to be solved by the invention]
When a temporary work scaffold is installed during the construction of a concrete structure using such a slip form method, the bracket 9 is fixed to the anchor bolt 10 embedded in the concrete structure 1 as shown in FIG. The work to be performed is performed on the plastering scaffold 8.
[0008]
The bracket 9 has a scaffold plate or the like laid thereon, has a triangular frame shape on the side, and projects toward the plastering scaffold 8. For this reason, when the bracket 9 is fixed on the plastering scaffold 8, when the mold 2 rises and the plastering scaffold 8 also rises, the plastering scaffold 8 and the bracket 9 come into contact, and the bracket 9 is moved to the plastering scaffold 8, This hinders the rise of the mold 2.
[0009]
In order to solve such inconvenience, the lifting of the formwork 2 may be temporarily stopped in order to set up a temporary work scaffold. However, in such a case, the construction period is extended by the stop period, and a joint is formed to reduce the concrete time. Problems such as the generation of weak points newly arise, making it difficult to take advantage of the slip foam method.
[0010]
The object of the present invention is to solve the disadvantages of the conventional example, and to install a temporary work scaffold when installing a tower-like concrete structure or the like using the slip form method, the provision of the temporary work scaffold is a slip form method. It is an object of the present invention to provide a bracket for temporary work scaffolding, which does not hinder the construction by the slip work method and can make the advantage of the construction by the slip form method effective.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the present invention firstly provides a bracket which is fixed to a concrete structure for installing a temporary work scaffold during construction of the concrete structure, wherein the work scaffold has a gap with a concrete wall surface of the structure. Arm fixed to the concrete structure so that it can pass through, a support arm having an end pivotally attached to the upper end of the fixed arm, and an end pivotally attached to the lower end of the fixed arm. The gist is that the support arm and the stay are combined so as to be flatly foldable with respect to the fixed arm.
[0012]
Secondly, the gist of the invention is that a long hole is formed in the support arm, and the other end of the stay is slidably engaged with the long hole.
[0013]
According to the first aspect of the present invention, the bracket is formed on the wall surface of the concrete structure by rotating the support arm and the stay around the shaft attachment portion with respect to the fixed arm fixed to the concrete structure. It is folded flat in a state of being attached. Therefore, the bracket is fixed to the concrete structure on the plastering scaffold, and even if the plastering scaffold rises with the formwork, the bracket is folded flat, so that it is formed between the plastering scaffold and the concrete structure. The bracket does not enter the gap and hinder the plastering platform from rising.
[0014]
According to the second aspect of the present invention, in addition to the above-described operation, at the time of folding, the other end of the stay is slidably engaged with the elongated hole formed in the support arm. The other end of the stay is also lifted to follow, and the stay is folded substantially linearly with the support arm.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view showing an embodiment of a bracket for a temporary work scaffold according to the present invention, and FIG. 2 is a side view in a state where the bracket is folded as described above. The bracket according to the present invention is also used for a temporary work scaffold shown in FIG. And is fixed to the concrete structure 1 for installing a temporary work scaffold during the construction of the concrete structure 1 as shown in FIG.
[0016]
As shown in FIG. 1, the bracket 9 includes a fixed arm 11 fixed to the concrete structure 1, a support arm 12 having an end pivotally attached to an upper end of the fixed arm 11, and a fixed arm 11. And a stay 13 whose end is pivotally attached to the lower end of the shaft.
[0017]
The fixed arm 11 is made of a channel-shaped steel material, and has bolt holes 11a and 11b for connecting the support arm 12 and the stay 13 to the upper end and the lower end, respectively. The support arm 12 is made of an angled steel material, and has a long hole 12a with which the end of the stay 13 is engaged at substantially the center in the length direction, and a locking pin 14a for engaging with the bolt hole 11a at the end. To protrude. The locking pin 14a is formed by, for example, welding and fixing a bolt, a nut, and a washer.
[0018]
The stay 13 is also made of an angled steel material. The stay 13 is formed by welding and fixing bolts, nuts, and washers at both ends, and is provided with locking pins 14b, 14c that respectively engage with the long hole 12a and the bolt hole 11b.
[0019]
A lock pin 14a provided on the support arm 12 is rotatably mounted on a bolt hole 11a at the upper end of the fixed arm 11, and a lock pin provided at one end of the stay 13 on a bolt hole 11b at the lower end of the fixed arm 11. A pin 14c is rotatably mounted on a shaft, and a locking pin 14b provided at the other end of the stay 13 is slidably engaged with a long hole 12a formed in the support arm 12.
[0020]
As a result, as shown in FIG. 2, the pivoting portion between the fixed arm 11 and the support arm 12, the pivoting portion between the fixed arm 11 and the stay 13, and the sliding portion between the support arm 12 and the stay 13 are formed. The support arm 12 and the stay 13 can be folded flat with respect to the fixed arm 11 so as to be able to pass through the gap between the existing work scaffold and the concrete wall surface of the structure during the construction of the concrete structure. To join together.
[0021]
Then, as shown in FIG. 3, a handrail mounting member 15 made of an angled steel material is erected from the tip of the support arm 12 upward. The handrail mounting member 15 is short so that the bracket 9 can be passed through the gap between the existing work scaffold and the concrete wall surface of the structure with the bracket 9 folded flat as described above.
[0022]
Next, a method of fixing the bracket 9 to the concrete structure 1 in the middle of construction and installing a temporary work scaffold will be described. As shown in FIG. 3, at the time of concrete casting of the concrete structure 1, the anchor bolts 10 are previously embedded in the cast concrete.
[0023]
Then, as shown in FIGS. 7 and 8, the upper and lower portions of the fixing arm 11 of the bracket 9 are fixed to the anchor bolt 10 on the plastering scaffold 8. Thus, the bracket 9 is fixed to the concrete structure 1. In this state, the support arm 12 is rotated to a horizontal position around a shaft attachment portion between the locking pin 14a and the bolt hole 11a, and a nut is fastened and fixed to the locking pin 14a at this horizontal position.
[0024]
When the support arm 12 rotates to the horizontal position, the stay 13 also rotates about the shaft attachment portion between the locking pin 14c and the bolt hole 11b, and at the same time, the locking pin 14b slides along the long hole 12a. Then, it is pulled out diagonally. Therefore, if the nut is tightened to the locking pins 14c and 14b at this oblique position, the stay 13 is fixed at this position.
[0025]
The fixing of the bracket 9 is performed at a plurality of horizontal and horizontal directions at appropriate intervals corresponding to the length of the scaffold plate or the like as shown in FIGS. A stage 18 on which upper surface expanded metal is attached is laid on the bracket 9, a wooden plate-like scaffolding plate 19 is laid between the stages 18, and a handrail 17 is attached to the handrail attaching member 15.
[0026]
The temporary work scaffold 16 is installed on the plastering scaffold 8, but when the formwork 2 rises, the stage 18, the scaffold plate 19 are removed, and the nuts tightening the locking pins 14a, 14b, 14c are loosened. Then, the fixing of the support arm 12 and the stay 13 to the fixed arm 11 is released, and the shaft attachment portion between the fixed arm 11 and the support arm 12, the shaft attachment portion between the fixed arm 11 and the stay 13, the stay 13 and the support arm 12, The entire bracket 9 is folded flat as shown in FIG.
[0027]
In this case, just by pulling up the end of the support arm 12, the stay 13 whose end is engaged with the elongated hole 12 a formed in the support arm 12, follows the lifting of the support arm 12, Since the end portion is pulled up while sliding along 12a, the support arm 12 is folded substantially linearly with respect to the fixed arm 11, and the stay 13 is folded substantially parallel with the fixed arm 11, so that the whole is flat. Become.
[0028]
The flat folded bracket 9 enters the gap A (350 mm in the illustrated example) between the concrete structure 1 and the plastering scaffold 8 as shown by the imaginary line in FIG. Even if it rises following the rise of the frame 2, the plastering scaffold 8 does not hit the bracket 9, and the bracket 9 does not hinder the rise of the formwork 2.
[0029]
As shown in FIG. 6, a tie bar 20 is stretched between the tip of a stage 18 laid on the bracket 9 and the concrete structure 1 at a position above the bracket 9 mounting point, as shown in FIG. Elevator platform 23. In the figure, 21 indicates a turnbuckle bracket, and 22 indicates a turnbuckle.
[0030]
【The invention's effect】
As described above, the temporary work scaffolding bracket of the present invention is used for installing a temporary work scaffold in a concrete structure when constructing a tower-like concrete structure or the like using the slip form method. Since the bracket for fixing is formed to be flat and foldable, the bracket does not hinder the rise of the formwork, and the installation of the temporary work scaffold does not hinder the construction by the slip form method, The advantage of the construction by the slip form method can be effectively used.
[Brief description of the drawings]
FIG. 1 is a side view showing an embodiment of a bracket for a temporary work scaffold of the present invention.
FIG. 2 is a side view in a folded state showing an embodiment of a bracket for a temporary work scaffold of the present invention.
FIG. 3 is a side view of the embodiment of the bracket for temporary work scaffolding of the present invention, which is fixed to a concrete structure.
FIG. 4 is a front view of a temporary work scaffold bracket according to an embodiment of the present invention, which is fixed to a concrete structure.
FIG. 5 is a front view of a temporary work scaffold using the temporary work scaffold bracket of the present invention.
FIG. 6 is a front view of a temporary stage elevator platform using the temporary work scaffold bracket of the present invention.
FIG. 7 is an explanatory view of a slip form (sliding formwork) method.
FIG. 8 is an explanatory view showing a case where a bracket for a temporary work scaffold is attached in a slip form (sliding formwork) method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Concrete structure 2 ... Form 3 ... Rebar 4 ... Climbing rod 5 ... Main work scaffold 6 ... Main yoke material 7 ... Yoke channel 8 ... Plastering scaffold 9 ... Bracket 10 ... Anchor bolt 11 ... Fixed arm 11a, 11b ... Bolt Hole 12: Support arm 12a: Slot 13: Stay 14a, 14b, 14c: Locking pin 15: Handrail mounting member 16: Temporary work scaffold 17: Handrail 18: Stage 19: Scaffold plate 20: Tie bar 21: Turn Buckle bracket 22 ... Turnbuckle 23 ... Elevator platform for temporary stage

Claims (2)

During the construction of the concrete structure, a bracket fixed to the concrete structure to install a temporary work scaffold is fixed to the concrete structure so that the work scaffold can pass through the gap between the concrete wall and the structure An arm, a support arm having an end pivotally attached to the upper end of the fixed arm, and a stay having an end pivotally attached to the lower end of the fixed arm. A bracket for a temporary work scaffold, wherein the support arm and the stay are combined so that they can be folded flat. The bracket for a temporary work scaffold according to claim 1, wherein an elongated hole is formed in the support arm, and the other end of the stay is slidably engaged with the elongated hole.

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