JP2004293176A - Protective scaffold unit for bridge and protective construction method using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a protective scaffold unit, for which a traffic regulation is not required even in the case of assembly and disassembly works and which can conduct works safely in the case of the construction, and a protective construction method using the unit by a simple constitution. <P>SOLUTION: In the protective scaffold unit 10 for various works such as the maintenance or the like of a bridge, the unit 10 is composed of unit bodies 11 suspended from main girders for the bridge and rotary frames 12 installed at the outer end of the bridge 11a constituting the unit bodies 11 in an openable and closeable manner. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a protective scaffold unit used when performing various operations such as painting and maintenance on a bridge, and in particular, can assemble and disassemble the bridge without restricting the traffic on a road under the bridge. The present invention relates to a protective scaffold unit for a bridge and a protective method using the same.
[0002]
[Prior art]
Naturally, "scaffolding" is necessary to safely perform painting, maintenance, and other work on bridges, but this scaffolding can be assembled and dismantled without obstructing other things. is necessary.
[0003]
For example, when a highway is constructed on a general road using a "bridge", maintenance work on the highway bridge must be performed so as not to hinder the traffic on the general road below if possible.
[0004]
As a "scaffold" for safely performing various operations such as painting and maintenance on such a highway bridge on a general road, for example, a "mobile protection system for a bridge" as described in Patent Document 1 "Protection work and its moving method" as described in Patent Document 2.
[0005]
[Patent Document 1] Japanese Patent Application Laid-Open No. 5-295712, Abstract and Selection Diagram [Patent Document 2] Japanese Patent Application Laid-Open No. 2000-74016, Abstract and Selection Diagram
[Problems to be solved by the invention]
Patent Literature 1 describes a mobile bridge protection system that “minimizes the risk of working at heights and reduces the costs associated with traffic regulation even when there is a road under the bridge. As shown in FIG. 7, a rail 25 is attached in advance along the main girder 1 of the bridge, and a roller 13 movable on the rail 25 is provided on the upper part, as shown in FIG. After suspending the jaw pipe 15 via the charged jig 14 to assemble the suspension scaffold 20, the pull-out is sequentially installed.
[0007]
However, in the method described in Patent Document 1, as described in Paragraph 0009 of Patent Document 1, "the rail 25 is attached in advance along the lower flange 1A of the main girder 1 by welding or the like. It is assumed that the welding work of the rail 25 and the like must be performed without the "bridge movable protection work".
[0008]
In other words, the maintenance work of the bridge itself can be performed using the "mobile protective work for the bridge", but at the time of the assembling work, the danger of working at heights is reduced, and traffic regulation is not required. is not.
[0009]
In addition, the “protective work and its moving method” as described in Patent Document 2 is performed for the purpose of “easy assembling and removing work of the protective work”, as shown in FIG. In addition, it is premised that "a plurality of bearing means having guide rollers are attached to a bridge girder", and even the protective work described in Patent Document 2 is considered to be dangerous during the assembly work. .
[0010]
In addition, in the protective works disclosed in Patent Documents 1 and 2, when performing maintenance on the side surface of a bridge (a surface exposed on the road side in the case of a highway bridge), The assembly and disassembly of the side plate (the portion corresponding to the rotating frame 12 constituting the present invention described below) as shown in FIG. 6 has a structure that cannot be performed unless road regulation is performed.
[0011]
The inventor of the present invention has been conducting various studies on how to prevent traffic from being required at all during the assembling work and the dismantling work in this kind of protective work. As a result, the present invention has been completed.
[0012]
That is, the main object of the present invention is to provide a protective scaffolding unit that does not need to regulate traffic even during its assembling and disassembling operations, and that can perform safe operations at the time of main construction. And a protection method using the same with a simple configuration.
[0013]
[Means for Solving the Problems]
In order to solve the above problems, first, means adopted by the invention according to claim 1 will be described with reference numerals used in the description of the embodiments described below.
"The protective scaffolding unit 10 for performing various operations such as maintenance of the bridge 20,
A bridge, comprising: a unit main body 11 suspended on a main girder 21 of a bridge 20; and a turning frame 12 provided at the outer end of a cross beam 11a constituting the unit main body 11 so as to be openable and closable. Protective Scaffolding Unit 10 "
It is.
[0014]
That is, as shown in FIG. 6, the protective scaffolding unit 10 according to claim 1 has a basic structure when completed, which is substantially the same as that of the conventional one. The difference lies in that a rotating frame 12 is rotatably provided at an end of a unit body 11 suspended on a main girder 21 of a bridge 20 via a rotating hinge 12a.
[0015]
In other words, when the protective scaffold unit 10 is transported or stored at a required location, as shown in FIG. 1, the rotating frame 12 is folded over the unit main body 11 and placed immediately below the bridge 20. In this case, the bridge 20 does not protrude from directly below the bridge 20 to the outside. Further, since the protective scaffold unit 10 does not protrude from directly below the bridge 20 to the outside, the lifting or hanging work by the work vehicle 40 directly under the bridge 20 does not protrude to the road side. You can do it.
[0016]
If the protective scaffold unit 10 is suspended on the bridge 20, maintenance work of the bridge 20 can be performed on the suspended scaffold unit. Work.
[0017]
By the way, in order to use the protective scaffolding unit 10 to perform maintenance on the side surface of the bridge 20 (surface exposed on the road side in the case of a highway bridge), fold it over the unit body 11. The rotating frame 12 is rotated upward on the road as shown in FIGS. This turning operation can be performed on the unit body 11 suspended on the main girder 21 of the bridge 20, that is, at a place other than on the road, and there is no need to regulate the road at that time.
[0018]
The rotation angle of the rotation frame 12 can be freely set as shown in FIG. 4, and in the embodiment described later, it is assumed that the rotation frame 12 can be rotated until it reaches the maximum horizontal state. Has become. Needless to say, if the state shown in FIG. 6 is set, the object will not fall on the road during the operation due to the rotating frame 12.
[0019]
Then, after the maintenance of the bridge 20 is completed, the dismantling operation may be performed in the opposite direction to the above.
[0020]
Therefore, the protective scaffolding unit 10 according to claim 1 does not need to restrict traffic even during the assembling and disassembling work, and furthermore, the protective scaffolding unit 10 can perform the work safely during the main construction. The scaffold unit and the protection method using the same can be provided with a simple configuration.
[0021]
By the way, in order to solve the above-mentioned problem, the means adopted by the invention according to claim 2 is based on the protective scaffolding unit 10 for a bridge according to claim 1.
"A portion of the cross beam 11a adjacent to the turning frame 12 and the turning frame 12 are provided with a connecting portion 13 for connecting a cable 30 such as a chain or a wire."
It is.
[0022]
That is, in the protective scaffolding unit 10 according to the second aspect, as shown in FIG. 4, the angle adjustment and fixing when the rotating frame 12 is rotated can be easily performed by connecting the cable 30 such as a chain or a wire. The connecting portion 13 is provided on the portion of the cross beam 11a adjacent to the rotating frame 12 and on the rotating frame 12.
[0023]
Thereby, in the protective scaffolding unit 10 of the second aspect, the connection between the connecting portions 13 can be fixed by the cable 30 such as a chain or a wire, and the safety during work can be further enhanced. ing.
[0024]
In order to solve the above-mentioned problem, means taken by the invention according to claim 3 is that the protective scaffolding unit 10 for a bridge according to claim 1 or 2
"A connection portion (rotating hinge 12a) of the rotating frame 12 to the cross beam 11a is provided with a rotation stop fixing plate 14 for preventing the rotating frame 12 from rotating when the rotating frame 12 becomes horizontal."
It is.
[0025]
That is, the protective scaffolding unit 10 of the third aspect should not prevent the rotating frame 12 from hanging down on the road, and therefore, it is necessary to prevent the rotating frame 12 from rotating. As shown in FIG. 5, it is provided on a rotating hinge 12a that connects the rotating frame 12 to the cross beam 11a.
[0026]
Due to the presence of the rotation stopper fixing plate 14, as shown in FIG. 4, the rotation of the rotation frame 12 when it is in a horizontal state can be prevented. Not only is it possible to prevent sagging, but also it is possible to work more safely on the side surfaces as well as on the lower surface of the bridge 20.
[0027]
Means taken by the invention according to claim 4 in order to solve the above problem is as follows:
A scaffold unit 10 composed of a unit main body 11 suspended on a main girder 21 of a bridge 20 and a turning frame 12 openably and closably provided at an outer end of a cross beam 11a constituting the unit main body 11 is described below. A protective construction method using the protective scaffolding unit 10, wherein the steps are assembled in the order of the steps or disassembled in the reverse order of the steps.
[0028]
(1) a step of carrying the protective scaffold unit 10 in a state where the rotating frame 12 is folded, to a construction site;
(2) a step of lifting the protective scaffold unit 10 and suspending it on the main girder 21;
(3) Step of opening the rotating frame 12 by rotating it with respect to the horizontal beam 11a and holding the horizontal beam 11a and the rotating frame 12 at a predetermined angle by connecting with the cable 30 "
It is.
[0029]
That is, according to this protective construction method, the protective scaffold unit 10 according to any one of claims 1 to 3 is used, and the maintenance work of the bridge 20 can be performed without blocking or restricting the road.
[0030]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, the invention according to each claim configured as described above will be described together with a protection method using the protection scaffold unit 10 of the embodiment shown in the drawings. In addition, the protective scaffold unit 10 of the embodiment substantially includes any one of the first to third aspects.
[0031]
FIG. 1 shows a bridge 20 which is a target to which the protective scaffold unit 10 according to the present invention is used and which constitutes an expressway. It is a general road. Of course, a main girder 21 is formed on the lower surface of the bridge 20, and the bridge 20 is reinforced by the main girder 21. The bridge 20 is supported on a T-shaped pier 22 and is located higher than a general road.
[0032]
By the way, just below the bridge 20 shown in FIG. 1, the protective scaffold unit 10 according to the present invention is carried in a state where the rotating frame 12 is folded, and the end of the general road side is a general road. It is arranged not to protrude inside. The protective scaffold unit 10 is suspended from the main girder 21 of the bridge 20 by a work vehicle 40 as shown in FIG. 2 as shown in FIG.
[0033]
When this protective scaffold unit 10 is unfolded, it has a shape as shown in FIG. 6, and as shown in FIGS. 1 and 6, a unit main body 11 formed by combining horizontal beams 11a and the like, and FIG. As shown in FIGS. 4 and 5, the unit comprises a rotating frame 12 rotatably connected to an end of the unit body 11 via a rotating hinge 12a.
[0034]
Further, as shown in FIG. 4, a rope 30 such as a chain or a wire is connected to a portion of the cross beam 11 a constituting the protective scaffold unit 10 adjacent to the turning frame 12 and the turning frame 12. A connecting portion 13 is provided.
[0035]
Further, as shown in FIG. 4 and FIG. 5, the rotating frame 12 is horizontal at a portion where the rotating frame 12 constituting the protective scaffolding unit 10 is connected to the cross beam 11a, that is, near the rotating hinge 12a. An anti-rotation fixing plate 14 is provided to prevent the rotation of the plate when it is in the state.
[0036]
Reference numeral 15 in FIG. 5 indicates a connection pin, and this connection pin 15 fixes the rotating frame 12 folded on the unit main body 11 to the unit main body 11.
[0037]
【The invention's effect】
As described in detail above, in the invention according to claims 1 to 3,
"The protective scaffolding unit 10 for performing various operations such as maintenance of the bridge 20,
The main body 11 is suspended from the main girder 21 of the bridge 20, and the rotating frame 12 is provided at the outer end of the cross beam 11a constituting the unit body 11 so as to be openable and closable. "
The main structural feature is that, even during the assembling and disassembling work, there is no need to regulate the traffic, and the protective work can be done safely during the construction work. The scaffold unit 10 can be provided with a simple configuration.
[0038]
In the invention according to claim 4, the following steps are performed while adopting the protective scaffolding unit 10 for a bridge according to claims 1 to 3.
(1) a step of carrying the protective scaffold unit 10 in a state where the rotating frame 12 is folded, to a construction site;
(2) a step of lifting the protective scaffold unit 10 and suspending it on the main girder 21;
(3) The turning frame 12 is opened by turning with respect to the cross beam 11a, and the cross beam 11a and the turning frame 12 are connected by the cable 30 so as to be assembled in the order of holding at a predetermined angle, or The feature is that the disassembly is performed in the reverse order of the following steps, whereby the maintenance work of the bridge 20 can be performed safely and without implementing the road regulation.
[Brief description of the drawings]
FIG. 1 is a front view of a bridge in which a protective scaffold unit of the present invention is to be used.
FIG. 2 is a front view showing a state where a work vehicle is arranged under the bridge.
FIG. 3 is a front view showing a state where the protective scaffold unit according to the present invention is suspended from a main girder of a bridge.
FIG. 4 is an enlarged front view of a portion A in FIG.
FIG. 5 is an enlarged front view of a portion b in FIG.
FIG. 6 is a perspective view of the protective scaffold unit according to the present invention when the rotating frame is rotated and deployed.
FIG. 7 is a front view showing a conventional technique.
FIG. 8 is a side view showing another conventional technique.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Protective scaffolding unit 11 Unit main body 11a Cross beam 12 Rotating frame 12a Rotating hinge 13 Connecting part 14 Rotation stop fixing plate 15 Connection pin 20 Bridge 21 Main girder 22 Bridge pier 30 Rope 40 Work vehicle

Claims (4)

A protective scaffolding unit for performing various tasks such as bridge maintenance,
A protective scaffolding unit for a bridge, comprising: a unit main body suspended from a main girder of the bridge; and a rotatable frame provided at an outer end of a cross beam constituting the unit main body so as to be openable and closable. The bridge protection device according to claim 1, wherein a connection portion for connecting a cable such as a chain or a wire is provided on a portion of the cross beam adjacent to the rotation frame and on the rotation frame. Scaffolding unit. The rotation-stop fixing plate for preventing the rotation of the rotation frame when the rotation frame is horizontal is provided at a connection portion of the rotation frame to the cross beam. Scaffolding unit for bridges in Russia. Assembling a scaffolding unit composed of a unit main body suspended from a main girder of a bridge and a rotatable frame provided at the outer end of a cross beam that constitutes the main body so as to be openable and closable, in the order of each of the following steps, or A protective construction method using a protective scaffolding unit, which is dismantled in the reverse order of each step.
(1) carrying the protective scaffolding unit with the rotating frame folded into the construction site;
(2) lifting the protective scaffolding unit and suspending it on the main girder;
(3) a step of opening the rotating frame by rotating with respect to the horizontal beam, and holding the horizontal frame at a predetermined angle by connecting the horizontal beam and the rotating frame with a cable;

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