Installation structure for overpass work scaffold

Abstract

To provide a work scaffold installed on a bridge configuring an overpass that is excellent in efficiency of installation work and contributes to accident prevention.SOLUTION: An overpass work scaffold at least comprises a scaffold unit 20 that configures a scaffold part and a fixing unit 30 that fixes the scaffold unit 20 to a bridge girder 10. The fixing unit at least has a magnetization unit 31 that is magnetically attached to a web 11 of the bridge girder, and a support column unit 32 that is formed from a longitudinal member coupled to the magnetization unit and arranged in a space (storage space 14) between an upper flange 12 and a lower flange 13 of the bridge girder. The scaffold unit at least has a scaffold plate 22 located at a height along the longitudinal direction of the support column unit. According to this structure, it is possible to prevent the scaffold from falling even if the magnetization unit is released from the web, because the support column unit abuts on the lower flange. Moreover, by forming a structure that can function as a suspended scaffold by a suspending unit 40, it is possible to provide a work scaffold further excellent in safety.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a structure for installing a working platform on a bridge constituting an overpass.

Background Art

[0002] As a working platform used when performing maintenance and inspection of bridges such as overpasses, a working platform described in Patent Document 1 below is known.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Since an overpass is constructed to straddle a railway such as a Shinkansen or a conventional line, it is necessary to pay particular attention to the following points when installing a working platform. (1) Regarding work efficiency Since it may be necessary to install the working platform within the limited time at night when the railway is not in operation, it is necessary to be able to construct the working platform in a shorter time. (2) Regarding safety It is preferable to ensure sufficient separation to prevent contact with overhead wires and the like located above the railway line and to impart electrical insulation to the working platform.

[0005] Therefore, an object of the present invention is to provide means that are excellent in the efficiency of the installation work and contribute to accident prevention in a working platform installed on a bridge such as an overpass.

Means for Solving the Problems

[0006] The invention of the present application made to solve the above problems is an installation structure of a working scaffold installed on a bridge constituting an overpass, comprising a scaffold part constituting the scaffold part, a fixing part for fixing the scaffold part to a bridge girder, and at least a suspension part for suspending the scaffold part from any of the members constituting the overpass. The fixing part comprises a magnetic attachment part magnetically attached to the web of the bridge girder and a long member connected to the magnetic attachment part, and at least has a support part disposed in a space between an upper flange and a lower flange of the bridge girder. The scaffold part is characterized by having at least a scaffold board positioned at a height in the longitudinal direction of the support part. Further, in the invention of the present application, the lower end of the support part may be in direct or indirect contact with the lower flange. Further, in the invention of the present application, the length of the support part may be configured to be substantially equal to the distance between the upper flange and the lower flange of the bridge girder. Further, in the invention of the present application, the magnetic attachment parts may be provided at two positions at intervals in the longitudinal direction of the support. Further, in the invention of the present application, in the support part, at least the surface of the support part may be covered with FRP.

Advantages of the Invention

[0007] According to the present invention, as a working scaffold installed on a bridge of an overpass, a working scaffold excellent in the efficiency of installation work and contributing to accident prevention can be provided.

Brief Description of the Drawings

[0008]

Figure 1

Embodiments for Carrying Out the Invention

[0009] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Embodiment

[0010] <1> Overall Configuration (Fig. 1) The installation structure of the working scaffold for the overpass according to this embodiment (hereinafter, also simply referred to as "this structure") is roughly composed of a bridge girder 10 that constitutes the bridge of the overpass, a scaffold part 20 that constitutes the scaffold part, a fixing part 30 that fixes the scaffold part 20 to the bridge girder 10, and at least a suspension part 40 that suspends the scaffold part 20 from any of the constituent members of the bridge. Hereinafter, the details of each component will be described.

[0011] <2>Bridge Girder The bridge girder 10 is a part of the constituent members of the bridge. In the present invention, the bridge girder 10 includes either a main girder extending in the longitudinal direction of the bridge or a cross girder disposed between the main girders. In the present invention, as the member used for the bridge girder 10, a shaped steel (including H-shaped steel or C-shaped steel) having a web 11 and a pair of flanges (upper flange 12, lower flange 13) is assumed. In this embodiment, a main girder made of H-shaped steel is used as the bridge girder 10.

[0012] <3>Scaffold Part The scaffold part 20 is a member that constitutes the scaffold part. In the present invention, the shape and structure of the scaffold part 20 are not particularly limited, and various shapes and structures used as the scaffold can be adopted. In this embodiment, the scaffold part 20 is configured to include at least a bracket 21 that can be attached to the fixing part 30, a scaffold board 22 attached to the upper part of the bracket 21, a morning glory 23 erected from the outer edge of the bracket 21, and a stay 24 connecting the upper part of the morning glory 23 and the inner edge side of the bracket 21.

[0013] <3.1>Position of the Scaffold Board In the present invention, the scaffold board 22 is to be positioned at the height in the longitudinal direction of the column part 32 described later. This is to cope with the case where it is required not to provide the scaffold part 20 below the lower flange 13 of the bridge girder 10 from the viewpoint of preventing contact with overhead wires provided on the railway.

[0014] <3.2>Providing Electrical Insulation Among the members constituting the scaffold part 20, it is preferable to impart electrical insulation to at least the members located on the lower side. This is to prevent electric shock accidents due to contact with overhead wires provided on the railway located below the overpass. As a method of imparting electrical insulation, a method of using a single pipe member made of FRP (Fiber Reinforced Plastics), a method of providing an electrical insulation layer (such as a tape material or a cylindrical material made of FRP, rubber, or other electrically insulating members) around a steel pipe, etc. can be considered.

[0015] <4> Fixing part The fixing part 30 is a member for fixing the scaffold part 20 to the bridge girder 10, and can also be used as a jig (fixing jig) for scaffold construction by the fixing part 30 alone. The fixing part 30 is configured to have at least a magnetic attachment part 31 and a support part 32. Hereinafter, the details of each part will be described.

[0016] <4.1> Magnetic attachment part The magnetic attachment part 31 is a member for fixing the fixing part 30 to the bridge girder 10 by magnetically attaching it to the web 11 constituting the bridge girder 10.

[0017] <4.1.1> Shape and structure of the magnetic attachment part 31 In the present invention, the shape and structure of the magnetic attachment part 31 are not particularly limited, and it is sufficient if it has sufficient magnetic force to firmly fix the scaffold part 20 to the bridge girder 10. As an example of a product that can be used as the magnetic attachment part 31 in the present invention, a strong magnet scaffold of Sakurai Giken Kogyo Co., Ltd. (https: / / www.sakuraigiken.co.jp / ?page_id=621) etc. can be used.

[0018] <4.1.2> Number of arrangements of the magnetic attachment part In the present invention, the number of the magnetic attachment parts 31 in the fixing part 30 is not particularly limited, and can be appropriately determined in consideration of the strength of the magnetic force, the stability of the scaffold, etc. In addition, if the number of the magnetic attachment parts 31 is too large with respect to the fixing part 30, when removing a certain magnetic attachment part 31, there is a possibility that other magnetic attachment parts 31 that have already been removed may reattach, and it is conceivable that the work efficiency deteriorates. Therefore, in the present embodiment, for the purpose of achieving both the maintenance of the stability of the scaffold and the suppression of the deterioration of the efficiency of the attachment / detachment work of the magnetic attachment parts 31, the magnetic attachment parts 31 are arranged at two locations with an interval in the longitudinal direction of the support column part 32.

[0019] <4.2> Support column part The support column part 32 is a member interposed between the scaffold part 20 and the bridge girder 10 in order to fix the scaffold part 20 to the bridge girder 10. As the support column part 32, a long member such as a single pipe can be used. The magnetic attachment parts 31 are directly or indirectly connected to the vicinity of the upper and lower ends of this long member and used.

[0020] <4.2.1> Providing electrical insulation Similar to the above-described scaffold body, it is preferable to provide electrical insulation to the support column part 32. Examples of methods for providing insulation are as described in the above <3.1>. In the present embodiment, a single pipe made of FRP is used for the support column part 32.

[0021] <4.2.2> Storage of the support column part In the present invention, in a state where the fixing part 30 is attached to the bridge girder 10 via the magnetic attachment parts 31, the support column part 32 is to be stored in a space (storage space 14) surrounded by the upper flange 12 and the lower flange 13. This is to prevent or minimize the fall of the fixing part 30 by bringing the support column into contact with the lower flange 13 in the unlikely event that the magnetic attachment part 31 comes off the bridge girder 10 and the fixing part 30 starts to fall. In addition, in the present invention, the lower end of the support column part 32 may be directly or indirectly brought into contact with the lower flange 13 in advance.

[0022] <4.2.3> Length of the support column part 32 In the present invention, the length of the support portion 32 is not particularly limited. For example, it can be configured to be approximately equal to the distance between the flanges of the steel section forming the bridge girder 10. Also in this embodiment, the length of the support portion 32 is approximately equal to the distance between the upper flange 12 and the lower flange 13 of the bridge girder 10 made of H-shaped steel. According to this configuration, when attaching the fixing portion 30 to the bridge girder 10, the work is carried out while adjusting the position so that the support portion 32 does not interfere with the upper flange 12 and the lower flange 13. Naturally, the attachment height of the fixing portion 30 is determined, contributing to an improvement in work efficiency. Further, in the state where the fixing portion 30 is attached to the web 11, the lower end of the support already substantially abuts on the lower flange 13. Therefore, even if the magnetic attachment portion 31 comes off from the bridge girder 10, the movement of the fixing portion 30 and the scaffold portion 20 can be suppressed.

[0023] <5> Suspension portion The suspension portion 40 is a member for connecting between the scaffold portion 20 and the bridge separately from the fixing portion 30. Various members such as a chain or a single pipe can be used for the suspension portion 40. By providing the suspension portion 40 in addition to the fixing portion 30, while further enhancing the stability of the work scaffold, even if the magnetic attachment portion 31 comes off from the bridge girder 10, the work scaffold according to this structure can be maintained in a state where it is established as a suspended scaffold.

[0024] <5.1> Number and suspension position of the suspension portion (FIG. 1) In the present invention, the number and the suspension position of the suspension portion 40 are not particularly limited, and can be appropriately designed from the viewpoint of enhancing the stability as a suspended scaffold. In this embodiment, a suspension portion 40 (first suspension portion 40a) made of a chain that loops between the vicinity of the boundary between the upper flange 12 and the web 11 and the inner edge of the scaffold portion 20, a suspension portion 40 (second suspension portion 40b) made of a chain that connects between the vicinity of the boundary between the upper flange 12 and the web 11 and the outer edge of the scaffold portion 20, and a suspension portion 40 (third suspension portion 40c) made of a chain that connects between the ground cover or railing constituting the bridge and the outer edge of the scaffold portion 20 are provided, consisting of three types of suspension portions 40.

[0025] <6>Other members In addition, in this structure, when the fixing part 30 is installed on the bridge girder 10, a packing piece 50 or the like may be provided so as to fill a gap generated between the vicinity of the lower part of the column part 32 and the web 11.

[0026] <7>Construction procedure (Fig. 1) In the present invention, the procedure for constructing the installation structure of the work scaffold for the overpass according to the present invention is not particularly limited, but for example, the following procedure can be adopted. In any procedure, for the first work scaffold, construction work may be carried out from an aerial work platform or the like, and for the second and subsequent times, construction work may be carried out from the already constructed work scaffold.

[0027] (1) Example of procedure 1 Attach the fixing part 30 to the web 11 of the bridge girder 10 by magnetic attachment with the magnetic attachment part 31, and install the remaining scaffold members (bracket 21, scaffold board 22, morning glory 23, stay member 24, etc.) and each suspension part 40 to construct a work scaffold.

[0028] (2) Example of procedure 2 Assemble a part or all of the fixing part 30 and the scaffold part 20 on the ground in advance and unitize them, fix each unit to the web 11 of the bridge girder 10, and appropriately install the remaining constituent members of the scaffold part 20 and the suspension part 40 to construct a work scaffold.

[0029] (3) Example of procedure 3 Assemble a plurality of fixing parts 30 on the ground in advance through a horizontal connecting member, a bracket 21, etc. and unitize them, fix each unit to the web 11 of the bridge girder 10, and appropriately install the remaining constituent members of the scaffold part 20 and the suspension part 40 to construct a work scaffold.

Explanation of reference numerals

[0030] 10: Bridge girder 11: Web 12: Upper flange 13: Lower flange 14: Storage space 20: Scaffold part 21: Bracket 22: Scaffold board 23: Morning glory 24: Brace 30: Fixing part 31: Magnetic attachment part 32: Support column part 40: Suspension part 40a: First suspension part 40b: Second suspension part 40c: Third suspension part 50: Furring strip

Claims

1. An installation structure of a working scaffold installed on a bridge constituting an overpass, including a scaffold part constituting the scaffold part, a fixing part for fixing the scaffold part to a bridge girder, and at least a suspension part for suspending the scaffold part from any of the members constituting the overpass. The fixing part includes a magnetic attachment part magnetically attached to the web of the bridge girder, and a support column part formed of a long member connected to the magnetic attachment part and disposed in a space between the upper flange and the lower flange of the bridge girder, and has at least The scaffold part is characterized by having at least a scaffold board located at a height in the longitudinal direction of the support column part. Installation structure of an overpass working scaffold.

2. The lower end of the support column part is in direct or indirect contact with the lower flange, Installation structure of the overpass working scaffold according to Claim 1.

3. The length of the support column part is substantially equal to the distance between the upper flange and the lower flange of the bridge girder, Installation structure of the overpass working scaffold according to Claim 1.

4. The magnetic attachment parts are provided at two positions at intervals in the longitudinal direction of the support column, Installation structure of the overpass working scaffold according to Claim 1.

5. In the support column part, at least the surface of the support column part is covered with FRP, Installation structure of the overpass working scaffold according to Claim 1.

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