JPH066828B2 - How to attach work scaffolds to the underside of the bridge - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for attaching a work scaffold to a lower surface of a bridge, and particularly to a work scaffold for inspecting and repairing a lower surface of a road bridge or an elevated road. The present invention relates to a method of attaching a work scaffold to a lower surface of a bridge so that the work scaffold is suspended from the upper surface of the bridge and attached to the lower surface.

[Prior Art] Conventionally, in order to inspect and repair the lower surface of a bridge or the like, it is common to use a lift work vehicle or an aerial work vehicle or to construct a work scaffold over a relatively wide area directly under the bridge. However, in the case of the latter, various work scaffolds that have been movable in recent years have been taken into consideration in order to reduce temporary costs. In particular, such a movable work scaffold is useful for repairing a bridge on a river, which cannot be done by the former lifter or other aerial work vehicle. To attach this type of mobile work platform, attach the arm to the bridge while the work platform is supported at the tip of an arm or the like provided for a vehicle dedicated to the installation work that is stopped on the road on the bridge. It is extended to the lower side and attached to the lower surface of the bridge.

A concrete method will be described. As shown in FIG. 11, first, an outrigger c is overhanging on the upper surface b of the bridge a so that the vehicle d
Is fixed, and one end of the work scaffold f is attached to the tip of the arm e of the vehicle d. Next, the arm e is extended to suspend the work scaffold f to the side of the bridge a, and then the support posts g are sequentially lowered to drop the work scaffold f below the lower surface h of the bridge a. At this time, the overturning moment due to the total weight of the work scaffold f is supported from the upper surface b of the bridge a by the overhang of the outrigger c. Next, by rotating the support post g, the other end of the work scaffold f is swung right under the lower surface h of the bridge a. Next, the pair of locking means i provided on the work scaffold f is locked to the flange portion k of the bridge girder j formed on the lower surface portion h. As a result, the work scaffold f is brought into a state in which it can be supported by the lower surface part h, and the mounting work is completed. Finally, the support post g will be removed from the work scaffold f.

[Problems to be Solved by the Invention] In the conventional mounting method, a dedicated vehicle d having a support post g for lowering and turning the work scaffold f for mounting the work scaffold f is provided. There was a problem that I had to prepare.

[Means for Solving Problems] The present invention provides a work scaffold extending in a direction crossing a bridge or the like to a flange portion formed on a lower surface portion while being suspended from an upper surface portion of the bridge or the like. When attaching with a pair of locking means, suspend one end of the work scaffold from the upper surface of the bridge etc. by the lifting means, and at the other side of the work scaffold, equip a balance weight that balances the weight of the work scaffold. After suspending the work scaffold and lowering it below the lower surface of the bridge, etc., rotate the work scaffold around its one end and let the other end go under the lower surface, and then change the suspended center of gravity of the work scaffold to another. After moving to the end side and locking the locking means on the other end side to the flange part, the working scaffold is lowered to lock the locking means on the one end side to the flange part. is there.

[Use] To describe the operation of the present invention, a balance weight is applied to the side opposite to the other end of the work scaffold on which one end is suspended to balance the weight of the work scaffold with that of the conventional vehicle. Without having to prepare, let the suspension / elevation work with a normal crane vehicle, etc., and by moving the center of gravity of suspension of the work scaffold and then descending the work scaffold, the locking means,
It avoids an impulsive load due to the inching of the crane when it is hoisted, and statically and reliably engages the flange portion in a fixed order.

[Embodiment] An apparatus for carrying out the present invention will be described below with reference to the accompanying drawings.

As shown in FIGS. 1 to 5, 1 is a work scaffold, and this work scaffold 1 has a considerable length, and the lower surface portion 2 a of the bridge 2 is
When it is attached to the flange portion 3 formed in the above, it is arranged under the bridge 2 so as to extend in a direction crossing the bridge 2.
Further, a pair of locking means 5 and 6 for locking the flange 3 to support the entire work scaffold 1 under the bridge girder 4 is provided on the upper part of the work scaffold 1.

On the other hand, a general hoisting means (not shown) such as a crane is provided on the upper surface portion 2b of the bridge 2, and the hoisting means is attached to a hanger (wire rope) 7 to be hung from the work scaffold 1 One end 1a of the work scaffold 1 is attached to suspend the work scaffold 1. Specifically, the one end portion 1a of the work scaffold 1 is provided with a projecting beam 8 projecting to the side opposite to the other end portion 1b, and the projecting beam 8 is used to attach the projecting beam to the lifting means. The overhanging beam 8 is provided with a balance weight that balances the weight of the work scaffold 1.

Although the balance weight is not specifically illustrated in the present embodiment, it can be balanced with the weight of the work scaffold 1 such as a load of water stored in a steel ingot or a tank or an external force such as a pulling force. Any of them will do. Regarding the installation, it may be installed directly on the overhanging beam 8 or may be indirectly hung by being suspended.

Next, a mounting method according to the present invention will be described.

First, as shown in FIG. 1, one end 1a of the work scaffold 1 is connected to a lifting tool 7 of a lifting means provided on the upper surface 2b of the bridge 2 via a projecting beam 8 and the projecting beam 8 is connected. In addition, a balance weight that balances the weight of the work scaffold 1 is provided.
Then, the work scaffold 1 and the like are hoisted by the hoisting means and are hoisted and transferred to the side of the bridge 2. In this regard,
The working scaffold 1 is arranged along the longitudinal direction of the bridge.

Then, as shown in FIG. 2, the work scaffold 1 is lowered to the lower side of the lower surface 2a of the bridge 2 by a hoisting means, and then the auxiliary rope 21 attached to the tip end portion of the projecting beam 8 is pulled laterally to perform the work. The scaffolding 1 is swiveled around its one end 1a, and the other end 1b is made to enter immediately below the lower surface 2a. Thereby, the work scaffold 1 is extended and arranged in the direction crossing the bridge 2. At this time, the pair of locking means 5 and 6 are respectively positioned above the flange portion 3 so as to face them.

Next, as shown in FIG. 3, the suspension center of gravity G of the work scaffold 1 located at the center of the lifting tool 7 is moved to the other end side G ₁ (indicated by (A) in the figure). As a result, the work scaffold 1 which is kept horizontal is slightly inclined, and the locking means 5 on the other end side where the center of gravity G of suspension is moved is locked to the flange portion 3. Various methods can be considered for the movement of the center of gravity G of suspension, and it is achieved by, for example, moving the load to the other end side or unloading the load.

When one of the locking means 5 is locked to the flange portion 3 in this way, then, as shown in FIG.
Is lowered (indicated by (B) in the figure), and the locking means 6 on one end side is locked to the flange portion 3. By thus locking the pair of locking means 5 and 6 to the flange portion 3, the work of attaching the work scaffold 1 to the bridge 2 is completed. Finally, as shown in FIG. 5, the projecting beam 8 may be detached from the work scaffold 1. The removal work is performed in the reverse order.

According to the mounting method as described above, it is not necessary to prepare a dedicated vehicle, and the mounting work can be performed using a crane or the like having a general structure.

Further, the pair of locking means 5 and 6 can be reliably stopped at the flange portion 3 in a fixed order by the movement of the suspended center of gravity G of the work scaffold 1 and the subsequent descent of the work scaffold 1. Further, since the locking work of the locking means 5 and 6 is adjusted by moving the load, moving the suspended center of gravity G in the horizontal direction by unloading the load, and lowering the work scaffold 1, the work is kept as quiet as possible. Since it can be locked to the flange portion 3, it is possible to suppress the impact force due to the inching when the crane is lowered.

Next, a more specific embodiment will be described with reference to FIGS.

In this embodiment, the weight 9 is used as the balance weight.
However, the movement of the weight 9 is adopted as a method for achieving the movement of the suspended center of gravity G, and the hydraulic cylinder 10 is employed as a means for further lowering the working scaffold 1. As shown in the drawing, the weight 9 is located at the end portion of the overhanging beam 8 opposite to the other end portion 1b of the working scaffold 1 and is formed on the overhanging beam 8 along the longitudinal direction of the working scaffold 1. It has wheels 12 running on a rail 11. The traveling of the weight 9 is performed by the power take-off end (PT.
This is achieved by controlling the wire of a winch driven by power from O) or the like. Also, the hydraulic cylinder 10
Both ends of which are rotatably attached to the work scaffold 1 and the overhanging beam 8 by detachable pins, and the work scaffold 1 and the overhanging beam 8 are integrally joined by hydraulic pressure during contraction,
The working scaffold 1 is slowly lowered with respect to the overhanging beam 8 by releasing the hydraulic pressure during extension. In addition, 13 is
It is a spherical seat that grounds the overhanging beam 8 and the work scaffold 1 at the other lifting tool 7 position, while the hydraulic cylinder 10 joins the overhanging beam 8 and the work scaffolding 1 at the one lifting tool 7 position. . Further, the hydraulic cylinder 10 is driven by the P.C. T.
O, etc.

Next, a specific procedure for the mounting work will be described. As described above, the working scaffold 1 is swung as shown in FIG.
b is inserted just below the lower surface 2a of the bridge 2, and the locking means 5,
6 is located near the flange 3. In this embodiment, the locking means 5 and 6 have an upper clamp 14 and a lower clamp 15 that sandwich the flange portion 3 from above and below.

Next, as shown in FIG. 7, the weight 9 is moved to the other end side to move the suspension center of gravity G of the work scaffold 1 to the other end side. As a result, the balance is slightly disturbed, and the locking means 5 on the other end side is formed.
The upper clamp 14 descends and is hung on the flange portion 3. Then, the lower clamp 15 is lifted by a hydraulic jack or the like to clamp the flange portion 3. At this time, the upper clamp 1
The impact of the grounding of the flange 4 on the flange portion 3 depends on the traveling speed of the weight 9, so that it can be applied very statically if this speed is set low.

Next, as shown in FIG. 8, if the hydraulic pressure of the hydraulic cylinder 10 that has joined the working scaffold 1 and the overhanging beam 8 up to then is released and extended, the working scaffold 1 for the overhanging beam 8 is released.
Is lowered, and the upper clamp 14 of the locking means 6 on one end side is hooked on the flange portion 3. After that, the lower clamp 15 is similarly lifted to clamp the flange portion 3.
Thereby, the work scaffold 1 can be attached to the bridge 2. Also in this case, if an oil return pipe (not shown) of the hydraulic cylinder 10 is provided with a "throttle" or the like, the grounding of the upper clamp 14 to the flange portion 3 can be static. .

Finally, as shown in FIG. 9, the pin 16 which connects the work scaffold 1 and the hydraulic cylinder 10 is removed, and the projecting beam 8 is separated from the work scaffold 1.

Alternatively, the spherical seat 13 may be configured such that the scaffold 1 and the beam 8 are rotatably connected by a detachable pin. Further, in this embodiment, if the working scaffold 1 is lowered by the lifting means, a rigid rod body may be used instead of the hydraulic cylinder 10.

Further, in FIG. 10, the balance weight, the movement of the suspended center of gravity G, and the lowering of the work scaffold 1 are performed by the water or the like in the tanks 17 and 18 installed in the projecting beam 8. As the balance weight, the first tank 17 of the projecting beam 8 provided on the side opposite to the other end 1b of the work scaffold 1 is used.
Water will be stored inside and it will function. Further, when the suspended center of gravity G is moved, the valve 19 is opened to move the water from the first tank 17 to the empty second tank 18 provided close to the other end side of the work scaffold 1. In this embodiment, if there is no problem, the tank 1 after the installation work is completed
The water in 7, 18 can be discharged as it is from the drain ports 20, 20, and the lifting of the overhanging beam 8 can be facilitated. If there is a river nearby, the water can be used and the attached device can be moved with a light load.

[Effects of the Invention] In summary, according to the present invention, the following excellent effects are exhibited.

A balance weight is applied to the side opposite to the other end of the work scaffold on which one end is suspended to balance the weight of the work scaffold so that it can be suspended with an ordinary crane without the need for a dedicated vehicle as in the past. It is possible to perform lifting work,
By moving the suspended center of gravity of the work scaffold and then descending the work scaffold, the locking means can be statically and reliably locked to the flange portion in a fixed order.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to FIG. 5 are process drawings showing the procedure of the method of attaching a work scaffold to the lower surface of a bridge according to the present invention, and FIG. 6 to FIG. FIG. 10 is a schematic side view showing another apparatus example, and FIG. 11 is a schematic side view showing a conventional example. In the figure, 1 is a work scaffold, 1a is one end thereof, 1b is the other end thereof, 2 is a bridge, 2a is a lower surface thereof, 2b is an upper surface thereof, 3 is a flange portion, 5 and 6 are locking means, 9 , 17 are weights and tanks illustrated as balance weights, and G is the center of gravity of suspension.

Claims (1)

[Claims] 1. When mounting a work scaffold extending in a direction crossing a bridge or the like while suspending it from the upper surface of the bridge or the like and attaching it to a flange formed on the lower surface by a pair of locking means. , Suspending one end of the work scaffold from the upper surface of the bridge or the like by a lifting means, and providing a balance weight on the side opposite to the other end of the work scaffold to balance the weight of the work scaffold, and After suspending the working scaffold and lowering it to the lower side of the lower surface of the bridge or the like, the working scaffold is swiveled around one end of the working scaffold so that the other end enters below the lower surface, and then the suspended center of gravity of the working scaffold is set. After moving to the other end side to lock the other end side locking means to the flange part, lower the work platform to lock the one end side locking means to the flange part. How to attach the work scaffold to the underside of the bridge.