JPH0681844B2 - Construction method for suspension scaffolding for bridges - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is applicable to, for example, a case where a work such as a floor slab is added to a bridge girder installed across a road in use.
The present invention relates to a construction method of a suspension scaffold to be erected for safety.

(Prior Art) For example, as shown in FIG. 19, a reinforced concrete floor slab 3 is added to a bridge girder 2 installed across a road 1 in use as shown in FIGS. When performing construction,
In order not to obstruct the traffic on the lower road 1 and to ensure the safety of the work in the additional work, it is necessary to provide a protective member capable of completely covering the lower surface and both side surfaces of the bridge girder 2.

In order to provide this protection member, conventionally, traffic control on the road 1 was performed, for example, temporary traffic was stopped at night, and a stage scaffold or the like was erected from under the bridge girder 2.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional method, the work time is limited, and mainly night work is performed, so that there are many safety problems and the work efficiency is lowered, so that the construction period is shortened. There is a problem that the cost is increased as it is prolonged.

(Means for Solving the Problems) In order to solve the above problems, in the present invention, a frame of unit length is placed on the bridge girder on one end side of the bridge girder, and the lower surface of the frame is placed. In addition to providing casters on both sides, a guide member that slides on the side edge of the bridge girder is projected on both sides of the frame, and a protective member that covers the lower surface and both side surfaces of the bridge girder over the unit length is hung from the frame, and this frame and After moving the protection member along the bridge girder by the one unit length, by repeating the operation of movably assembling the frame and the protection member to the bridge girder again on one end side of the bridge girder, After arranging the protection member over substantially the entire length, the suspension member connected to the framework is rejoined to the bridge girder so that the framework can be removed.

(Operation) As described above, according to the present invention, a frame of unit length is movably placed on the bridge girder via casters and guide members on one end side of the bridge girder. When moving the vehicle, there is no fear of derailment due to the guide member, and the action of the swingable caster allows the vehicle to easily pass between the bolts and the like protruding to the upper surface of the bridge girder.

Further, according to the present invention, the entire bridge girder can be efficiently covered by the protective member by the work in the daytime without traffic regulation on the lower road, so that the work safety is improved and the work efficiency is improved. In addition to shortening the construction period, costs can also be reduced.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

1 to 9 are process explanatory views of the method of the present invention, in which 1 is a currently used guideway (which may be a railway or a river with a lot of traffic) 2 is on the road 1 It is a bridge girder laid across.

According to the present invention, for example, when the construction for adding a reinforced concrete floor slab 3 to the bridge girder 2 as shown in FIG.
Bridge girder 2 to ensure the safety of the work in the additional work
This is a construction method of suspending scaffolding that attaches a protective member that can completely cover the lower surface and both side surfaces of the.

In this embodiment, on the upper surface of the bridge girder 2 on the open space 4, which is below the right end of the bridge girder 2 installed on the road 1, as shown in FIGS. The two H-section steels 5,5 are arranged in parallel along the longitudinal direction of the
Shaped steels 6 slightly longer than the width of the bridge girders 2 are arranged at right angles to the upper surface of the bridges and are fixed so as to be orthogonal to the shaped steels 5. On the part, the shaped steels 7 are arranged in parallel with the shaped steels 5, respectively, and the framed shape 8 having a unit length is integrally formed by being fixed to the overlapping shaped steels 6, and on the lower surface of the shaped steels 5, The casters 9 as shown in FIG. 11 are arranged at appropriate intervals, and the guide members 10 as shown in FIG. When placed on the bridge girder 2, these guide members 10 are located outside the bridge girder 2 so as to guide the casters 9 so as not to derail.

Further, chain attachments 11 as shown in FIG. 13 are arranged at appropriate intervals on the lower surface of the shaped steel 7 on both the left and right sides and fixed to the shaped steel 7. Then, the frame 8 integrally formed as described above is placed on the bridge girder 2.

In FIG. 11, 9a is a wheel, 9b is a shaft, 9c is a bracket, and 9d.
Is a mounting seat plate, and the seat plate 9d and the bracket 9c are rotatably connected.

Further, in FIG. 12, 10a is a mounting seat plate, 10b is a front-rear direction plate, and 10c.
Is a rib and 10d is a guide rod.

Further, in FIG. 13, 11a is a mounting seat plate, 11b is a vertical plate, and 11c is a chain connecting hole.

Further, as shown in FIGS. 14 to 18, a protective member 12 for covering the lower surface and both side surfaces of the bridge girder 2 over the unit length is provided with a pipe.
A frame is formed by 13, and a plywood 14 is attached to the inside of the frame to form a groove, and the protective member 12 thus formed is fitted so as to wrap the bridge girder 2 from below, and the chain 15 is used. It is suspended from the frame 8.

FIG. 1 shows a state in which the frame 8 having a unit length and the protective member 12 are attached to the right end portion of the bridge girder 2 in this manner.

Next, after moving the frame 8 and the protection member 12 along the bridge girder 2 by the one unit length as shown by the first arrow A to the position shown in FIG. As shown in FIG. 3, the frame 8 and the protective member on the open space 4 of
12 is movably attached to the bridge girder 2, then moved as shown in FIG. 4, and as shown in FIG. 5, a frame 8 and a protective member 12 are newly attached, which is further shown in FIG. As shown in FIG. 7, the frame 8 and the protective member 12 are newly assembled, and after moving as shown in FIG. 8, the frame 8 and the protective member 12 are newly protected as shown in FIG. By assembling the member 12, the frame 8 and the protection member 12 can be positioned over substantially the entire length of the bridge girder 2. After doing this, as shown in FIG. 18, the chain 15 which is a suspension member connected to the frame 8 via the chain mounting bracket 11 is spliced to the chain mounting bracket 16 provided on the bridge girder 2 and then the Remove the framework 8.

FIG. 18 shows a state in which the frame 8 is removed.

In this way, there is no obstacle on the upper surface of the bridge girder 2, so that the additional work described above can be performed without any trouble. Moreover, in this case, since the underside and both side surfaces of the bridge girder 2 are surely covered by the protective member 12, there is no fear that the traffic on the lower road 1 will be obstructed by a fall or the like even during the work, and the safety of the additional construction worker is also improved. Reserved.

(Effect of the Invention) According to the present invention as described above, since the frame of unit length is movably mounted on the bridge girder via the caster and the guide member on one end side of the bridge girder, When the frame is moved, there is no concern about derailment due to the guide member, and the action of the swingable caster allows the frame to pass smoothly between the bolts and the like protruding to the upper surface of the bridge girder.

Further, according to the present invention, since the entire bridge can be efficiently covered by the protective member by the work in the daytime without traffic regulation on the lower road, work safety is improved and work efficiency is improved. In addition to shortening the construction period, the excellent effect that the cost can be reduced is obtained.

[Brief description of drawings]

1 to 9 are explanatory views showing the steps of the method of the present invention, FIG. 10 is a perspective view of a frame, FIG. 11 (a) is an elevation view of a caster, and FIG. 11 (b) is a side view thereof. 12C is a plan view of FIG. 12A, FIG. 12A is an elevation view of the guide member, FIG. 12B is a side view thereof, and FIG. Fig. 13 (a) is an elevation view of the chain mounting bracket, Fig. 13 (b) is its side view, Fig. 13 (c) is the bottom view of Fig. 14 (a), and Fig. 14 is a protective member. Fig. 15 is a side view of the bridge girder with the frame and protection members partially omitted, Fig. 16 is its sectional view, and Fig. 17 is the bridge girder and protection member with the frame removed. Fig. 18 is a side view showing Fig. 18, and Fig. 18 is a sectional view showing the same. Fig. 19 is a sectional view showing a state in which a reinforced concrete floor slab is attached on the bridge girder. 1 …… Road in use 2 …… Bridge girder 5,6,7 …… Shaped steel, 8 …… Frame 9 …… Caster, 10 …… Guide member 11 …… Chain mounting bracket, 12 …… Protective member 13… … Pipe, 14 …… Plywood 15 …… Chain (hanging member), 16 …… Chain mounting bracket

Claims (1)

[Claims] 1. A frame of unit length is placed on the bridge girder at one end of the bridge girder, casters are provided on the lower surface of the frame, and slides on both sides of the frame with side edges of the bridge girder. A guide member to be protruded, and a protective member for covering the lower surface and both side surfaces of the bridge girder over the unit length is hung from the frame, and the frame and the protective member are moved along the bridge girder for the unit length, and , Again at one end of the bridge girder,
By repeating the operation of movably assembling the frame and the protective member with respect to the bridge girder, after positioning the protective member over substantially the entire length of the bridge girder, the suspension member connected to the frame is spliced to the bridge girder to form the frame. A suspension scaffolding construction method for bridges characterized by being removed.