JPH0624008U - Mobile scaffolding for steel bridges - Google Patents

Abstract

(57) [Summary] [Purpose] The use of the lower flange surface of the main girder enables suspension of a movable scaffold on a bridge. [Structure] A main guide girder 12 having a traveling wheel 4 which comes in contact with a main girder lower flange 3 formed on a main girder 2 on one side of a bridge body 1 so as to be able to move up and down and retract, and the main guide girder 12 turns. Stretchable scaffold 13 that is freely attached, and travel that is attached to the scaffold 13 and that abuts on the girder lower flange 3 formed on the main girder 2 on the other side of the bridge body 1 so as to be able to move up and down and retract. It is characterized in that it is composed of a sub guide girder 21 having wheels 4.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a mobile scaffold for steel bridges, which is applied to painting work, including maintenance and inspection of steel bridges.

[0002]

[Prior art]

 In general, examples of moving scaffolds for steel bridges are temporary scaffolds constructed by chains, single pipes, and scaffold plates on the underside of the bridge by human power, or self-propelled inspection vehicles such as long bridges. There are known self-propelled inspection vehicles equipped with arms and gondola on trucks and trucks.

[0003]

[Problems to be solved by the device]

 However, installing suspended scaffolding under the girder requires work by manpower at a high place, which poses a safety problem and requires a considerable number of days for installation and removal. In the case of self-propelled scaffolding (inspection vehicle) of long bridge, it is necessary to attach a dedicated rail to the bridge body, and due to the difference in bridge alignment (shape), it cannot be diverted to other bridges and it will be a stationary type. Not only that, if there is a pier, it cannot pass through it, so it is necessary to provide a self-propelled scaffold for each span.

Further, in a self-propelled inspection vehicle with a gondola, it is necessary to regulate or stop the traffic of general vehicles during work. The present invention was developed to address such a problem, and it is an object of the present invention to suspend the scaffolding on the bridge by using the flange surface below the main girder, thereby eliminating the need for mounting a dedicated rail.

[0005]

[Means for Solving the Problems]

 The structure of the present invention for achieving the above-mentioned object will be described with reference to FIGS. 1 to 4 corresponding to the embodiments. The present invention relates to a main girder lower flange formed at the lower end of the main girder on one side of the bridge body. A main guide girder having traveling wheels that abut up and down freely and retractably, a telescopic scaffolding that is rotatably attached to the main guide girder, and a scaffold that is attached to the scaffold and is attached to the other side of the bridge main body. It is characterized in that it comprises a sub guide girder having traveling wheels which come into contact with a main girder lower flange formed at the lower end of the main girder so as to be vertically movable and retractable.

The present invention is further characterized in that the two main guide girders are combined in the front and rear.

[0007]

[Action]

 According to the present invention, the traveling wheels attached to the main guide girder and the traveling wheels attached to the auxiliary guide girder by the above means are brought into contact with the lower flange of the main girder so as to move up and down, and the change of the lower flange surface of the main girder ( It freely travels with respect to changes in width, obstacles such as joints, etc., and also freely travels according to the arrangement of the main girder lower flange where the main girder lower flange is retractably abutted and the main girder changes. In addition, when two main guide girders are combined in the front and rear direction, it is possible to pass through the piers by shortening and retracting the scaffold on one side and storing it in addition to normal running.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. Reference numeral 1 denotes a bridge body, and a main girder 2 provided on a lower surface of the bridge body 1 is provided with a main girder lower flange 3. .. Reference numeral 4 denotes a traveling wheel that comes into contact with the main girder lower flange 3, and the traveling wheel 4 includes a torque motor 5, a ball screw 6 interlocked with the torque motor 5, and a ball screw 6 as shown in FIGS. 3 and 4. The wheel 4 is supported by a bracket fixed to the end and is held by a fall prevention device 8 including a guide roller 7 that contacts the outer side of the main girder lower flange 3 to prevent the wheel 4 from falling off the main girder lower flange 3. In addition to the above, the traveling wheel 4 is automatically followed by the change of the main girder lower flange 3, and the traveling wheel 4 is attached to a horizontal arm 10 via an elevating device 9 by attaching an elevating column mounted orthogonally to its rotation axis. Is mounted on the main guide girder 12 via the arm retraction device 11, so that the traveling wheel 4 is in contact with the main girder lower flange 3 so as to be vertically movable and retractable.

Reference numeral 13 denotes a scaffold, which is rotatably attached to the main guide girder 12 via a swivel shaft 14, and the scaffold 13 is fixed to the swivel shaft 14 to a floor support frame 15 and a floor retractor. A fixed floor 17 mounted via 16 and a movable floor 19 mounted on the fixed floor 17 via a floor retracting device 18, and an auxiliary guide girder is attached to an end of the movable floor 19 via a swivel shaft 20. As shown in FIG. 4, the traveling wheel 4 is attached to the sub guide girder 21 via the arm 10, the elevating device 9 and the fall prevention device 8 as shown in FIG. Reference numeral 22 in the drawing denotes a handrail which is attached to the fixed floor 17 and the movable floor 19 in a folding manner.

Thus, when a sensor (not shown) provided on the traveling wheels 4 detects an obstacle, the elevating device 9 operates and the traveling wheels 4 move up and down to avoid the obstacles so that each traveling wheel 4 has the main lower girder 3. It is possible to automatically follow the change of the lower girder flange 3 of the main girder while traveling on the upper side by the fall prevention device 8. Further, when passing the bridge pier, the two main guide girders 12, 12 are joined to each other through the joint 23 as shown in FIG. 5, and the two main guide girders are joined as shown in FIG. 5 (a). When the main guide girders 12 in the front part approach the bridge pier 24 as shown in FIG. 5 (b), the movable floor 19 is stored in the fixed floor 19 together. In this state, the swivel shaft 14 is swung so that the fixed floor 17 overlaps the main guide girder 12 in parallel, and the bridge pier 24 is passed as shown in FIG. 5 (c). As described above, the swivel shaft 14 is swung again so that the fixed floor 17 is directly attached to the main guide girder 12 and then the movable floor 19 is pulled out so that the traveling wheels 4 on the sub guide girder 21 are brought into contact with the main girder lower flange 3. After contacting them, as shown in FIG. 5 (e), the pivot shaft 14 of the rear main guide girder 12 is attached. The fixed floor 17 is passed over the bridge pier 24 in a state where the fixed floor 17 is parallel to the main guide girder 12, and after the passage, the swivel shaft 14 is swung again as shown in FIG. After mounting the guide girders 12 at right angles, the movable floor 19 can be pulled out, and the traveling wheels 4 on the auxiliary guide girders 21 can be brought into contact with the lower flanges of the main girders to resume traveling.

[0011]

[Effect of device]

 As described above, according to the present invention, a main guide girder having a traveling wheel that abuts the lower girder lower flange formed on the lower end of the main girder on one side of the bridge body so as to be vertically movable and retractable; A sub-guide having a freely extendable and retractable scaffold and traveling wheels that are attached to the scaffold and abut on the lower girder flange formed on the lower end of the main girder on the other side of the bridge body so as to be vertically movable and retractable. Since the moving scaffold is composed of the girder and the moving girder, the moving scaffold can smoothly move along the flange under the main girder of the steel bridge, and it can be mounted without specifying the shape of the bridge. It can be applied to almost all bridges, and when two main guide girders are combined back and forth, one scaffold can be swiveled so that even a pier does not have to be removed and reattached each time and can be passed through as is. It has the effect.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a plan view showing an embodiment of the present invention.

FIG. 3 is an enlarged view of a portion A of FIG.

FIG. 4 is an enlarged view of part B in FIG.

FIG. 5 is an explanatory diagram showing a pier passage procedure.

[Explanation of symbols]

 1 Bridge Main Body 2 Main Girder 3 Main Girder Lower Flange 4 Running Wheel 12 Main Guide Girder 13 Scaffold 21 Sub Guide Girder

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shin Maekawa 12 Nishiki-cho, Naka-ku, Yokohama-shi, Kanagawa Mitsubishi Heavy Industries, Ltd. Yokohama Works (72) Inventor Yuzo Kawamura 1 of 61, Komazawa, Setagaya-ku, Tokyo (72 ) Inventor Ryōta Maeda 19-25, 1-1 Nakamachi, Setagaya-ku, Tokyo (72) Inventor Yasuo Imaizumi 304-1 1-1 Higashiyama, Minato-ku, Yokohama-shi, Kanagawa

Claims (2)

[Scope of utility model registration request] 1. A main guide girder having a traveling wheel that comes in contact with a lower girder lower flange formed at the lower end of the main girder on one side of the bridge body so as to be able to move up and down and retract, and is rotatably attached to the main guide girder. An extendable scaffold, and a sub-guide girder attached to the scaffold and having traveling wheels that abut on the lower girder flange formed on the lower end of the main girder on the other side of the bridge body so as to be vertically movable and retractable. A mobile scaffold for steel bridges. 2. The moving scaffold for steel bridges according to claim 1, wherein two of said main guide girders are combined in a front and rear direction.