JP7444385B1 - Installation structure of work scaffolding for overpass - Google Patents

Abstract

[Problem] To provide a means for improving the efficiency of installation work and contributing to accident prevention in work scaffolding installed on a bridge that constitutes an overpass. The present invention includes at least a scaffolding part 20 constituting a scaffolding part and a fixing part 30 fixing the scaffolding part 20 to a bridge girder 10. The fixing part 30 consists of a magnetically attached part 31 that is magnetically attached to the web 11 of the bridge girder 10 and a longitudinal member that is connected to the magnetically attached part 31. The supporting column 32 is disposed in the space 14). The scaffolding section 20 has at least a scaffolding board 22 located at a midway height of the column section 32 in the longitudinal direction. According to this structure, even if the magnetic attachment part 31 comes off from the web 11, the support part 32 comes into contact with the lower flange 13, so that it is possible to prevent the scaffold from falling. Furthermore, if the structure is such that it can be used as a suspended scaffold by the hanging portions 40, it is possible to provide a work scaffold with even greater safety. Alternatively, a part or all of the members constituting the scaffold section 20 may be attached to the fixed section 30 in advance to form a unit, and this unit may be installed on the bridge girder 10 to construct a work scaffold. [Selection diagram] Figure 1

Description

Application of Article 30, Paragraph 2 of the Patent Act Implemented on April 3, 2020 (Tani Overpass Bridge (3791-3 Kosaka Nishi, Kamogata-cho, Asakuchi City, Okayama Prefecture))

The present invention relates to a structure for installing work scaffolding on a bridge that constitutes an overpass.

2. Description of the Related Art A work scaffold described in Patent Document 1 below is known as a work scaffold used when performing maintenance and inspection of a bridge such as an overpass.

Japanese Patent Application Publication No. 2001-172920

Since overpass bridges are constructed to straddle railways such as Shinkansen and conventional lines, the following points need to be taken into particular consideration when installing work scaffolding.
(1) Regarding work efficiency Since work scaffolds may be installed during limited hours at night when railways are not in operation, work scaffolds should be able to be constructed in a shorter time.
(2) Regarding safety In order to prevent contact with feeder lines, etc. located above the railway tracks, it is preferable to ensure sufficient separation and provide electrical insulation to the work scaffold.

Therefore, an object of the present invention is to provide a means for improving the efficiency of installation work and contributing to accident prevention in work scaffolds installed on bridges such as overpasses.

The present invention, which was made to solve the above problems, is an installation structure of a work scaffold installed on a bridge constituting an overpass, in which a scaffold part constituting the scaffold part and the scaffold part are fixed to a bridge girder. and a suspension part for suspending the scaffolding part from any of the members constituting the overpass, and the fixing part includes a magnetic attachment part for magnetically attaching the scaffolding part to the web of the bridge girder; The scaffolding section includes at least a support section that is made of a longitudinal member connected to the magnetically attached section and is disposed in the space between the upper flange and the lower flange of the bridge girder, and the scaffold section is arranged in the longitudinal direction of the support section. It is characterized in that it has at least a scaffolding board located at an intermediate height.
Further, in the present invention, the lower end of the support column may be brought into direct or indirect contact with the lower flange.
Further, in the present invention, the length of the support column may be approximately equal to the distance between the upper flange and the lower flange of the bridge girder.
Further, in the present invention, the magnetic attachment portions may be provided at two locations spaced apart from each other in the longitudinal direction of the pillar.
Further, in the present invention, the support section may be configured such that at least the surface of the support section is covered with FRP.

According to the present invention, it is possible to provide a work scaffold to be installed on an overpass, which has excellent installation work efficiency and contributes to accident prevention.

1 is a schematic diagram showing an installation structure of a working scaffold for an overpass according to the present invention.

Embodiments of the present invention will be described below with reference to the drawings.

<1> Overall configuration (Figure 1)
The installation structure of the work scaffold for an overpass bridge according to this embodiment (hereinafter also simply referred to as the "main structure") can be roughly divided into the bridge girder 10 that constitutes the bridge of the overpass bridge, the scaffold section 20 that constitutes the scaffolding part, and the scaffolding. It includes at least a fixing part 30 that fixes the part 20 to the bridge girder 10, and a suspension part 40 that suspends the scaffold part 20 from any of the constituent members of the bridge.
The details of each component will be explained below.

<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 both main girders extending in the longitudinal direction of the bridge and cross girders arranged between the main girders.
In the present invention, a steel section (including an H section steel or a C section steel) having a web 11 and a pair of flanges (upper flange 12, lower flange 13) is assumed as a member used in the bridge girder 10.
In this embodiment, a main girder made of H-beam steel is used as the bridge girder 10.

<3> Scaffolding part The scaffolding part 20 is a member that constitutes a scaffolding part.
In the present invention, the shape and structure of the scaffold section 20 are not particularly limited, and various shapes and structures used as scaffolds can be adopted.
In this embodiment, the scaffolding section 20 includes a bracket 21 that can be attached to the fixed section 30, a scaffold board 22 that is attached to the upper part of the bracket 21, a morning glory 23 that is erected from the outer edge of the bracket 21, and the upper part of the morning glory 23 and the bracket. The structure includes at least a retainer 24 that connects the inner edge side of 21.

<3.1> Position of Scaffolding Board In the present invention, the scaffolding board 22 is located at a midway height in the longitudinal direction of the support section 32, which will be described later. This is to cope with the case where it is required not to provide the scaffolding section 20 below the lower flange 13 of the bridge girder 10 from the viewpoint of preventing contact with feeder wires etc. installed on the railway.

<3.2> Providing electrical insulation properties It is preferable to provide electrical insulation properties to at least the members located on the lower side among the members constituting the scaffold section 20.
This is to prevent electric shock accidents due to contact with feeder lines installed on the railway located below the overpass.
Electrical insulation can be provided by using a single pipe member made of FRP (Fiber Reinforced Plastics), or by using an electrically insulating layer (made of FRP, rubber, or other electrically insulating material) around the steel pipe. Possible methods include providing a tape material, a tube material, etc.

<4> Fixing part The fixing part 30 is a member for fixing the scaffold part 20 to the bridge girder 10, and the fixing part 30 alone can also be used as a jig (fixing jig) for constructing a scaffold.
The fixing part 30 includes at least a magnetically attached part 31 and a support part 32.
The details of each part will be explained below.

<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 that constitutes the bridge girder 10.

<4.1.1> Shape and structure of the magnetically attached part 31 In the present invention, the shape and structure of the magnetically attached part 31 are not particularly limited. It only needs to have magnetic force.
As an example of a product that can be used as the magnetic attachment part 31 in the present invention, Sakurai Giken Kogyo Co., Ltd.'s strong magnetic scaffolding (https://www.sakuraigiken.co.jp/?page_id=621) can be used. .

<4.1.2> Number of magnetically attached parts arranged In the present invention, the number of magnetically attached parts 31 in the fixed part 30 is not particularly limited, and should be determined as appropriate in consideration of the strength of the magnetic force, the stability of the scaffolding, etc. I can do it.
Note that if the number of magnetically attached parts 31 is too large for the fixed part 30, when a certain magnetically attached part 31 is removed, there is a risk that other magnetically attached parts 31 that have already been removed will become re-magnetized, which will make the work more difficult. It is possible that efficiency will deteriorate.
Therefore, in this embodiment, the magnetically attached parts 31 are arranged at intervals in the longitudinal direction of the column parts 32 in order to maintain the stability of the scaffolding and to suppress the deterioration of the efficiency of the work of attaching and detaching the magnetically attached parts 31. It has a configuration in which it is placed in two locations.

<4.2> Strut Section The strut section 32 is a member interposed between the scaffold section 20 and the bridge girder 10 in order to fix the scaffold section 20 to the bridge girder 10.
For the support portion 32, a longitudinal member such as a single tube can be used. Magnetic attachment portions 31 are connected directly or indirectly to the vicinity of the upper and lower sides of this elongated member.

<4.2.1> Provision of electrical insulation properties It is preferable that the support pillars 32 be provided with electrical insulation properties, similar to the scaffold body described above.
An example of the method for imparting insulation is as described in <3.1> above.
In this embodiment, a single tube made of FRP is used for the support section 32.

<4.2.2> Storage of the strut portion In the present invention, when the fixed portion 30 is attached to the bridge girder 10 via the magnetic attachment portion 31, the strut portion 32 is surrounded by the upper flange 12 and the lower flange 13. It is assumed that the device is stored in the space (storage space 14).
This is to prevent or minimize the fall of the fixed part 30 by bringing the column into contact with the lower flange 13 in the event that the magnetically attached part 31 comes off from the bridge girder 10 and the fixed part 30 is about to fall. be.
Further, in the present invention, the lower end of the support column 32 may be brought into contact with the lower flange 13 directly or indirectly in advance.

<4.2.3> Length of the strut portion 32 In the present invention, the length of the strut portion 32 is not particularly limited; can.
In this embodiment as well, the length of the strut 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 steel.
According to this configuration, when attaching the fixing part 30 to the bridge girder 10, the work is done while adjusting the position so that the support part 32 does not interfere with the upper flange 12 and the lower flange 13, and the fixing part 30 naturally attaches to the bridge girder 10. The installation height is determined, contributing to improved work efficiency.
In addition, when the fixed part 30 is attached to the web 11, the lower end of the column is already in almost contact with the lower flange 13, so even if the magnetically attached part 31 comes off the bridge girder 10, the fixed part 30 And movement of the scaffolding part 20 can be suppressed.

<5> Hanging Part The hanging part 40 is a member, separate from the fixing part 30, for connecting the scaffolding part 20 and the bridge.
Various members such as a chain or a single tube can be used for the hanging portion 40.
By providing a suspension part 40 in addition to the fixing part 30, the stability of the work scaffold is further increased, and even if the magnetically attached part 31 comes off the bridge girder 10, the work scaffold according to this structure can be suspended. It is possible to maintain the established state as a scaffold.

<5.1> Number of hanging parts and hanging positions (Figure 1)
In the present invention, the number and hanging positions of the hanging parts 40 are not particularly limited, and can be designed as appropriate from the viewpoint of improving stability as a hanging scaffold.
In this embodiment, a hanging part 40 (first hanging part 40a) consisting of a chain connecting the inner edge of the scaffold part 20 in a loop from near the boundary between the upper flange 12 and the web 11, and the upper flange A suspension part 40 (second suspension part 40b) consisting of a chain that connects the outer edge of the scaffolding part 20 from near the boundary between the web 12 and the web 11, and a suspension part 40 (second suspension part 40b) that connects the scaffolding part Three types of hanging parts 40 are provided, including a hanging part 40 (third hanging part 40c) made of a chain that connects the outer edge of 20.

<6> Other members In addition, in this structure, when the fixing part 30 is installed on the bridge girder 10, a batten 50, etc., which is arranged so as to fill the gap created between the lower part of the support part 32 and the web 11, etc. may be provided.

<7> Construction procedure (Figure 1)
In the present invention, the procedure for constructing the installation structure of the overpass work scaffold according to the present invention is not particularly limited, but for example, the following procedure can be adopted.
In either procedure, the first work scaffold may be constructed from an aerial work vehicle or the like, and from the second time onward, the construction work may be performed from an already constructed work scaffold.

(1) Procedure example 1
The fixing part 30 is magnetically attached to the web 11 of the bridge girder 10 using the magnetic attachment part 31, and the remaining scaffolding members (bracket 21, scaffolding board 22, morning glory 23, braces 24, etc.) and each hanging part 40 are installed. and construct a work scaffold.

(2) Procedure example 2
A part or all of the fixed part 30 and the scaffolding part 20 are assembled on the ground in advance into a unit, and the whole unit is fixed to the web 11 of the bridge girder 10, and the remaining components of the scaffolding part 20 and the hanging part 40 are assembled. Set up as appropriate and construct a work scaffold.

(3) Procedure example 3
A plurality of fixing parts 30 are assembled in advance on the ground using horizontal connecting materials, brackets 21, etc. to form a unit, and each unit is fixed to the web 11 of the bridge girder 10, and the remaining components of the scaffolding part 20 and suspension The sections 40 are installed appropriately to construct a work scaffold.

10: Bridge girder 11: Web 12: Upper flange 13: Lower flange 14: Storage space 20: Scaffolding section 21: Bracket 22: Scaffolding board 23: Morning glory 24: Retainer 30: Fixed section 31: Magnetic attachment section 32: Support section 40 : Hanging part 40a: First hanging part 40b: Second hanging part 40c: Third hanging part 50: Batten

Claims (5)

An installation structure for work scaffolding installed on a bridge constituting an overpass,
A scaffolding part that constitutes a scaffolding part;
a fixing part that fixes the scaffolding part to a bridge girder;
At least a suspension part for suspending the scaffold part from any of the members constituting the overpass,
The fixed part is
a magnetic attachment part that is magnetically attached to the web of the bridge girder;
a strut section comprising a longitudinal member connected to the magnetically attached section and arranged in a space between an upper flange and a lower flange of the bridge girder;
have at least
The scaffolding section is
characterized in that it has at least a scaffolding board located at a midway height in the longitudinal direction of the support column,
Installation structure of work scaffolding for overpass. The lower end of the support column is in direct or indirect contact with the lower flange,
The installation structure of a working scaffold for an overpass according to claim 1. The length of the support column is approximately equal to the distance between the upper flange and the lower flange of the bridge girder,
The installation structure of a working scaffold for an overpass according to claim 1. The magnetic attachment portion is provided at two locations spaced apart from each other in the longitudinal direction of the support.
The installation structure of a working scaffold for an overpass according to claim 1. In the pillar part, at least the surface of the pillar part is covered with FRP,
The installation structure of a working scaffold for an overpass according to claim 1.

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