JP3100574B2 - Suspended scaffold and its erection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a specific suspended scaffold used for viaduct work and a method for installing the suspended scaffold at a high place.

[0002]

2. Description of the Related Art As a conventional method of erection of a scaffold used for high-altitude work, after assembling a framed scaffold having a fixed floor area on the ground, the framed scaffold is lifted up by a lifting means such as a crane truck or the like. The construction method of hanging at the predetermined position of
It is disclosed in JP-A-9-273120. Further, Japanese Patent Publication No. 3-12172 discloses that a hoist rail is assembled first by moving a working scaffold for hoist installation up and down from the ground and transporting the hoist equipment to a high place, and then to the ground. The small split scaffold assembled by assembling is lifted by the hoist installed first and fixed to the main girder, and by repeating the same work, a large number of split scaffolds are connected in the horizontal and vertical directions to build a large scaffold. It is known. The split scaffold disclosed therein has a structure in which auxiliary pipes are arranged orthogonally on a single-beam beam pipe arranged in parallel, and their intersections are fixed with separately prepared clamps, and a scaffold plate is laid thereon. Have been.

[0003]

In the above-mentioned conventional scaffold structure, the auxiliary pipe is arranged orthogonally on a single beam pipe and a scaffold plate is laid to form a thin floor. And low rigidity against bending.
Therefore, when the divided scaffold is suspended from the main girder by a suspension chain, consideration must be given to reducing the distance between the suspension points and the amount of deflection of the entire scaffold from the viewpoint of safety. However, since many suspension chains are stretched everywhere in the scaffold after construction, these suspension chains are likely to hinder the passage of workers and the transport of materials during work such as building and repairing bridges. . Also, assembling the scaffold is performed by fixing a single auxiliary pipe to a single beam pipe by using a clamp fitting separately prepared for each joint, one place at a time. Things.

[0004] It is an object of the present invention to provide a suspension scaffold which has high rigidity and facilitates assembling and disassembling operations, and a method capable of safely and quickly constructing the suspension scaffold.

[0005]

According to the first aspect of the present invention, there is provided a suspension scaffold according to the first aspect of the present invention, in which an upper chord member and a lower chord member arranged at regular intervals are connected by a reinforcing member and integrated. Truss-shaped beams provided with joint plates at both ends of the elongated beam main body, a plurality of first connecting rods provided with clamps at both ends of the rod member, and upper and lower positions of both ends of the rod member A plurality of second connecting rods provided with downward hook portions and clamp fittings, the truss-shaped beams are arranged in parallel, and the first connecting rods are connected to their lower chord members by clamp fittings, respectively. A hook portion of the second connecting rod is engaged with the upper chord member, and a clamp fitting is fitted to the lower chord member to fix the second connecting rod to the beam main body, respectively, and a scaffold plate is provided on the second connecting rod. And on the scaffold plate The provided protection sheet has been laid scaffold,
At one end or both ends in one direction of the scaffold, a shielding wall in which a thin plate material is stretched on the inner surface of a rectangular frame is fixed by being inclined or upright.

According to a second aspect of the present invention, there is provided a suspension scaffold according to the first aspect, wherein a plurality of truss-shaped beams are linearly connected by a connecting plate. It is characterized by being.

According to another aspect of the present invention, there is provided a method of erection of a suspended scaffold, the method comprising the steps of: Is the way. A plurality of truss-like beams having joint plates at both ends of a long beam body integrated by connecting upper and lower chord members arranged at regular intervals by a reinforcing member, and both ends of a rod member A plurality of first connecting rods provided with a clamp, and a plurality of second connecting rods provided with a downward hook portion and a clamp at upper and lower positions of both ends of the rod member. The truss-shaped beams are arranged in parallel, the first connecting rods are respectively connected to the lower chord members by clamps, the hooks of the second connecting rods are respectively engaged with the upper chord members, and the clamps are connected to the upper chords. The second fitting
The connecting rods are respectively fixed to the beam main body, a scaffold plate is arranged on the second connecting rod, and a scaffold on which a protective sheet is laid is provided on the scaffold plate, and one end or both ends of the scaffold in one direction. Then, a hanging scaffold constituted by fixing a shielding wall in which a thin plate material is stretched on the inner surface of a rectangular frame by inclining or standing upright is assembled in a work area such as a private occupation zone on the ground. A plurality of winch mounts on which winches are mounted are appropriately arranged on the hanging scaffold, and the winch is attached to the truss-like beam of the hanging scaffold. The hanging scaffold is moved to the erection point by using the framework cart, and then the winch wire rope is retracted into the pulley attached to the main girder of the viaduct.
The suspension scaffold is raised to the erection height by a winch. A suspension chain suspended from a clamp fixed to the main girder is attached to the truss-like beam of the suspension scaffold, and the height from the lower end of the main girder to the suspension scaffold is adjusted. After removing the winch platform from the suspended scaffold, the platform is lowered to the ground and removed. One end of the suspension chain fixed to the main girder is connected to the upper part of the shielding wall of the suspension scaffold.

[0008]

The truss-like beam, the first connecting rod, and the second connecting rod, which are the main members constituting the scaffold, are connected quickly and easily because of the use of clamps.
Can be assembled. In particular, since the truss-shaped beam is provided so as to increase the longitudinal modulus of elasticity and has a structure with high bending rigidity of the entire scaffold, when this scaffold is suspended by a suspension chain on the main girder of the viaduct, the distance between the suspension points It is possible to reduce the number of suspension chains in the scaffold after erection, and the traffic of workers and the transportation of materials are performed smoothly.

Further, it is possible to assemble the entire scaffold including the shielding wall in a work area such as a private occupation zone on the ground, and to move and install the work to the installation site in a short time by using the framework cart used at the time of assembly. Therefore, traffic control time for vehicles on the ground is reduced.

Therefore, according to the hanging scaffold and the method of erection thereof, the hanging scaffold has high rigidity, and the working space in the scaffold can be effectively used. In addition, scaffolding and dismantling work can be done easily in a short time,
There are advantages such as the ability to quickly and safely mount a suspended scaffold.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a suspended scaffold, FIGS. 2 to 6 are explanatory views showing an assembling sequence of the suspended scaffold, FIG. 7 is a front view of a truss beam, FIG. 8 is a front view of a first connecting rod,
9 is a front view of the second connecting rod, FIG. 10 is a trolley for framing, FIG.
1 is a front view of a winch stand, and FIGS. 12 to 17 are explanatory views showing the order of erection of a hanging scaffold.

The truss-like beam 10 shown in FIG. 7 is a main member constituting the framework of the suspension scaffold F shown in FIG.
Approximately 43mm in diameter and 4m in length arranged at regular intervals
A beam main body 14 is provided in which the upper chord member 11 of the circular pipe and the lower chord member 12 of the same long dimension are continuously connected in a zigzag V-shape by a reinforcing member 13 and firmly connected by welding. It is integrated by welding with the joint plate 15 provided with the through hole 16 interposed therebetween.

The first connecting rod 20 shown in FIG.
The first connecting rod has clamp members 22, 22 integrally fixed to both ends of a rod member 21 serving as a circular pipe having a length of about 1.8m and a length of about 1.8m. The clamp fitting 22 has one end of a substantially semicircular opening / closing piece 24 connected to one end of a semicircular fixed piece 23 having an open lower part by a pin 25, and is rotatably connected to the other end of the fixed piece 23 by a small angle. The supported bolt 26
A nut 27 is screwed into the bolt 26 through the free end 24 a of the closed opening / closing piece 24.

The second connecting rod 30 shown in FIG.
Downward hook portions 32, 32 are integrally fixed to both ends of a rod member 31 having a corner and a length of about 1.8 m by welding, and one end of a stay 33 is fixed to both ends of the rod member 31 by a pin 34 with a small angle. In addition to being rotatably connected, a clamp fitting 35 is provided at a free end of the stay 33 so as to be arranged below the center of the hook 32. The clamp member 35 has the same structure as the clamp member 22. One end of a semicircular fixing member 36 having an open lower part is connected to one end of a substantially semicircular opening / closing member 37 by a pin 38. A bolt 39 rotatably supported by a small angle at the other end of 36 is provided so that a nut 40 is screwed to the bolt 39 through a free end 37 a of a closed opening / closing piece 37. .

Here, the suspended scaffold F using the above-mentioned main member is used.
Will be described. When assembling,
A frame base 45 provided with a bifurcated receiving piece 47 above a stand 46 shown in FIG. 2, or a frame bogie 50 shown in FIG.
Any of the above is appropriately used. The frame bogie 50 has a set of universal wheels 52 attached to the lower surface of a rectangular frame 51, supporting members 53, 53 are arranged on the frame 51, and guide rods 54 are provided on both sides of the supporting members 53. Each is standing.

First, a plurality of truss-like beams 10 are connected to a plurality of framework mounts 4 in a work area such as a private occupation zone on the ground.
5 (or the trolley 50) is temporarily inserted and fixed to the receiving pieces 47, and the first connecting rods 20 are respectively connected to the lower chord members 12 by the clamps 22 so that the truss beams 10 are parallelized. (FIG. 2). Truss beam 1
Hook portions 32, 3 of the second connecting rod 30
2 and the clamp fittings 35
The second connecting rods 30 are securely fixed to the beam main body 14 by fitting them to the lower chord members 12 and gripping them (FIG. 3). Next, the rod member 31 of the second connecting rod 30
The metal scaffolds 60 are arranged in a row (FIG. 4), and the protective sheet 61 is laid on those scaffolds 60. Then, in order to prevent the protection sheet 61 from floating, the protection sheet 61 is fixed by a pressing plate 62 (FIG. 5). This constitutes the scaffold f.

When a long scaffold f is required, the required length can be obtained by connecting the truss-like beams 10 at the joint plate 15 using bolts.

Next, a pipe frame 67 is appropriately combined vertically and horizontally at one end (or both ends) of the scaffold f in one direction and connected with a known fixing bracket to provide a rectangular frame 66 in an inclined (or upright) shape. . Next, the rectangular frame 66 is reinforced by appropriately using a reinforcing rod 68 (FIG. 6), and a thin plate material 6 such as a plywood for a formwork is formed on an inner surface 66a of the frame 66.
9, and a shielding wall 65 commonly called a morning glory is attached to the scaffold f.
Are provided integrally. Further, the outer surface of the shielding wall 65 is appropriately covered with a safety net. Thus, the suspension scaffold F shown in FIG. 1 is configured.

Next, a method of erection when the hanging scaffold according to the present invention is used for viaduct work will be described with reference to FIGS.
7 will be described. First, in a work area such as a private occupation zone on the ground, the hanging scaffold F is connected to the frame bogie 50 shown in FIG.
Assemble above. This is as described above. Next, two winch stands 70 on which the winch 71 shown in FIG. 11 is mounted and the pair of hanging fittings 72 are provided are arranged on the hanging scaffold F, and the hanging fittings 72 are attached to the upper chord member 11 of the truss-like beam 10. Attach. After the suspension scaffold F is moved to the erection point using the frame bogie 50, the wire rope 71a of the winch 71 is retracted into a pulley (not shown) attached to the main girder a of the viaduct (FIG. 12, (FIG. 13). After slightly lifting the suspended scaffold F by operating the winch 71, the safety net attached to the shielding wall is fixed, the lower surface of the scaffold is inspected, and then moved up to the erection height (FIGS. 14 and 15). Main girder a
The suspension chain b suspended from the clamp fixed to
The hanging scaffold F is securely attached to the truss-like beam 10, and the height from the lower end of the main girder a to the scaffold is adjusted. At the same time, the tension of the suspension chain b is checked (FIG. 16). After removing the winch rack 70 from the hanging scaffold F,
Is dropped on the ground and removed. One end of the suspension chain c fixed to the main girder a is connected to the upper part of the shielding wall 65 of the suspension scaffold F (FIG. 16). Thus, the installation of the suspension scaffold F is completed (FIG. 17).

In the case where the suspension scaffold F is removed and dismantled after the viaduct work has been completed, the suspension scaffold F is carried out in the reverse order of the above-described erection method and assembly method. The details are omitted.

[Brief description of the drawings]

FIG. 1 is a perspective view of a suspended scaffold.

FIG. 2 is an explanatory view showing an assembling sequence of a hanging scaffold.

FIG. 3 is an explanatory view showing an assembling sequence of a hanging scaffold.

FIG. 4 is an explanatory view showing the order of assembling the suspended scaffold.

FIG. 5 is an explanatory view showing the order of assembling the suspended scaffold.

FIG. 6 is an explanatory view showing the order of assembling the suspended scaffold.

FIG. 7 is a front view of a truss beam.

FIG. 8 is a front view of a first connecting rod.

FIG. 9 is a front view of a second connecting rod.

FIG. 10 is a trolley for a framework.

FIG. 11 is a front view of a winch stand.

FIG. 12 is an explanatory view showing the order in which hanging scaffolds are erected.

FIG. 13 is an explanatory diagram showing the order of erection of hanging scaffolds.

FIG. 14 is an explanatory view showing the order of erection of hanging scaffolds.

FIG. 15 is an explanatory view showing the order of erection of hanging scaffolds.

FIG. 16 is an explanatory view showing the order in which the hanging scaffolds are erected.

FIG. 17 is an explanatory view showing the order of erection of the hanging scaffolds.

[Explanation of symbols]

a → main girder b, c → suspension chain f → scaffold F → suspension scaffold 10 → truss beam 11 → upper chord member 12 → lower chord member 14 → beam body 15 → joint plate 20 → first connecting rod 21 → rod member 22 → Clamp fitting 30 → second connecting rod 31 → rod member 32 → hook 3
5 → Clamp fitting 45 → Frame for frame 50 → Frame for frame 60 → Scaffold plate
61 → Protective sheet 65 → Shielding wall 66 → Rectangular frame 69 → Thin plate 70 → Winch mount 71 → Winch

Claims (3)

(57) [Claims] 1. A plurality of truss-like beams having joint plates at both ends of a long beam body integrated by connecting an upper chord member and a lower chord member arranged at regular intervals by a reinforcing member. A plurality of first connecting rods provided with clamps at both ends of the rod member, and a plurality of second connecting rods provided with downward hook portions and clamps at upper and lower positions of both ends of the rod member; The truss-shaped beams are arranged in parallel, the first connecting rods are respectively connected to the lower chord members by clamps, the hooks of the second connecting rods are respectively engaged with the upper chord members, and the clamps are connected to the lower chords. The second connecting rods are fixed to the beam main body by being fitted to the lower chord members, and scaffold plates are arranged on the second connecting rods, and a scaffold on which a protective sheet is laid is provided on the scaffold plate. At one end or both ends in one direction, A suspended scaffold characterized in that a shielding wall in which a thin plate material is stretched is fixed to an inner surface of a rectangular frame by inclining or standing upright. 2. The suspended scaffold according to claim 1, wherein the plurality of truss beams are connected linearly by a connecting plate. 3. A method for erection of a suspended scaffold, which is used for a viaduct work according to the following procedure. A plurality of truss-like beams having joint plates at both ends of a long beam body integrated by connecting upper and lower chord members arranged at regular intervals by a reinforcing member, and both ends of a rod member A plurality of first connecting rods provided with a clamp, and a plurality of second connecting rods provided with a downward hook portion and a clamp at upper and lower positions of both ends of the rod member. The truss-shaped beams are arranged in parallel, the first connecting rods are respectively connected to the lower chord members by clamps, the hooks of the second connecting rods are respectively engaged with the upper chord members, and the clamps are connected to the upper chords. The second connecting rod is fixed to the beam main body by being fitted to the lower chord member, a scaffold plate is arranged on the second connecting rod, and a scaffold on which a protective sheet is laid is provided on the scaffold plate. One end in one direction or The end, a rectangular frame hanging scaffold sheet material is constituted by fixing in an inclined or upright stretched by shielding wall on the inner surface of the assembled in work areas such as straps ground occupied. A plurality of winch mounts on which winches are mounted are appropriately arranged on the hanging scaffold, and the winch is attached to the truss-like beam of the hanging scaffold. The hanging scaffold is moved to the erection point by using the framework cart, and then the winch wire rope is retracted into the pulley attached to the main girder of the viaduct. The suspension scaffold is raised to the erection height by a winch. A suspension chain suspended from a clamp fixed to the main girder is attached to the truss-like beam of the suspension scaffold, and the height from the lower end of the main girder to the suspension scaffold is adjusted. After removing the winch platform from the suspended scaffold, the platform is lowered to the ground and removed. One end of the suspension chain fixed to the main girder is connected to the upper part of the shielding wall of the suspension scaffold.