JPH0649810A - Method of removing bridge crossbeam - Google Patents

Abstract

PURPOSE:To enable a bridge crossbeam to be removed in a short time, inexpensively and safely. CONSTITUTION:A bridge crossbeam 5 is taken away to a specified location by means of suspending the crossbeam 5, which both ends are cut off, from supporting members 21, 22 which travel on rails fixed on girders 13, 14 built on both side of the crossbeam 5 to be removed. The girders 13, 14 are then removed. Thus a bridge crossbeam can be removed within a short time, with less expense and with safety.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bridge removing method for removing a bridge such as a bridge spanned on a highway.

[0002]

2. Description of the Related Art For example, when constructing a highway, a number of grade intersections will be constructed between highways and between general roads and highways. The bridge will be constructed.

On the other hand, in order to cope with the increase in traffic volume in recent years, widening work is increasing to increase the lanes of roads. At that time, the bridge constructed on the road will be removed, the road will be widened, and a new bridge will be constructed again.

When such a bridge is removed, a crushing method utilizing vibration or shock is used, which causes great noise and vibration during the construction, which is not suitable for construction with many houses.

Therefore, it is necessary to transport a large crane to the construction site, thereby supporting the bridge in the lifting direction to divide both ends of the bridge, lifting the bridge with the crane and moving it to the side of the road, and then performing the disassembly and disassembly. Is proposed.

[0006]

In the removal method by dividing the bridge as described above, the place where the first construction is to be performed is closed, the crane truck is made to travel to the site, and the preparation for lifting the bridge by the crane truck is made. Construction,
Next, the both ends of the bridge will be divided, the bridge will be carried out with a crane, after various cleaning up, the crane truck will be withdrawn, and the road will be opened for use.

Therefore, the above method requires that the highway be closed for about 12 hours. For example, a major road such as the Tomei Expressway will cause a significant traffic stagnation, and the toll revenue of the highway will be greatly reduced. Become.

Therefore, it is an object of the present invention to provide a bridge removing method capable of removing a bridge safely at low cost in a short time.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a bridge whose both ends are separated by a supporting member that runs on the rails of both garters, with garters with rails laid on both sides of the bridge to be removed. It is designed so that the bridge can be removed in a predetermined position by suspending and traveling, and then the garter can be removed, thereby making it possible to remove the bridge safely at low cost in a short time.

[0010]

Since the present invention is configured as described above, when removing a bridge, a garter with rails is hung on both sides of the bridge to be removed first by a crane vehicle or the like, and a supporting member that runs on the rails of both garters is supported. Run the appropriate number of bridges to support the bridge on the support member, and at this time divide both ends of the bridge with a wire saw, or divide both ends of the bridge so that the bridge does not fall in the existing state before the above work. The bridge removal work will be completed by suspending the bridge and removing it at a predetermined position, and then removing the garter with a crane vehicle.

[0011]

Embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1 and FIG. 2, a bridge 2 is hung on a road 1 such as a highway because it crosses the road, and the bridge 2 is a bridge supported by columns 3 and 4 on both sides of the road 1. 5 is the main component. The pillars 3 and 4 form the foundation of the bridge 2 having the function of a retaining wall for the earth and sand and rock mass 6 on the road side in the figure,
It forms a support groove for the bridge.

When the number of lanes is increased by increasing the traffic volume on the road 1 as described above, it is necessary to widen the width of the road, and for that purpose, it is necessary to replace the bridge 2. For that purpose, the bridge 5 currently being applied must be removed, but at that time it is necessary to first separate the pillars 3 and 4 from the bridge 5, and the upper ends of the pillars 3 and 4 are cut horizontally, The horizontal dividing parts 7 and 8 are formed. In addition, the length of the bridge to be removed should be the minimum length, and the length of the bridge 5 should not drop even if the horizontal dividing portions 7 and 8 are formed on the upper ends of the columns 3 and 4 as described above. The vertical dividing portions 10 and 11 are formed by the above method. In addition, part of the incidental equipment of the bridge 2 such as the guard 12 may be divided or removed in advance if necessary. Since the vehicles on the road 1 are not affected during the construction work, it is not necessary to close the road 2 when the road 2 is a highway, and the business can be continued. In addition, the road 2 will be closed during the subsequent work.

Next, as shown in FIG. 3, the first garter 13 and the second garter 14 are bridged in parallel with each other on both sides of the bridge 5 to be removed by a crane 15 such as a mobile crane. At that time, as shown in FIG. 7, a base member 16 may be installed for stable support of the garter. As shown in FIG. 5, the garter 5 is made of a structural material having a mouth-shaped cross section, and a rail 18 is fixed to the upper surface 17 along the axial direction thereof. The length of the garter is preferably a little longer than twice the length of the divided bridge 5 for removal, but it is more than the length between the columns 3 and 4 for the allowable load of the crane vehicle, transportability and workability. If this is not possible, bridges of the same length may be connected later.

Next, the garters 13 provided on both sides of the bridge,
Support member 2 in which wheels 20 are located on rails 14 of 14
1, 2 are mounted, the first support member 21 is moved to the support column 3 side, and the second support member 22 is positioned on the support column 4 side. Three hydraulic jacks 23 are provided in the upper part of the support member 21, and bolts 24 penetrating each hydraulic jack 23 can be moved up and down by hydraulic pressure. When the support member 21 travels, a hole 25 through which the bolt 24 is inserted is provided in the bridge 5 in advance, and the support member 21 is stopped immediately above this hole.
The operation of the hydraulic jack 23 is released, the bolt 24 is lowered, the hole 25 is penetrated, and then the nut 26 is screwed and fixed to the lower side of the bridge 5. Similarly, the second support member 22 also has a hydraulic jack and a bolt, and like the first support member, the bolt is inserted through a hole previously formed in the bridge and fixed with a nut.

When the hydraulic jacks 23 of the first support member 21 and the second support member 22 are actuated and the bolts 24 are pushed up, the bridge 5 whose both ends have been divided beforehand is lifted,
It is kept within the height range between the garters 13, 14.

As shown in FIG. 7, the bridge held by the support member is transported from above the road 1 to a position outside the range by pulling the first support member 21 with a winch or the like and removed. Then, by removing the garters 13 and 14 with a crane truck, the road 1 becomes passable.

When the bridge is removed, as shown in FIG. 4, a rail 26 is installed between the garters 13 and 14, and when the bridge is carried by a supporting member, it may be dropped if it should happen. You may take safety measures to prevent damage.

The method for removing a bridge according to the present invention can be applied not only to bridges on highways but also to various bridges.

[0019]

EFFECTS OF THE INVENTION Since the present invention is constructed as described above, before the road work under the bridge is closed during the work of removing the bridge, the work of dividing both ends of the bridge, which requires the most work time, should be performed in advance. It is possible to do so, and it is only necessary to close the road during the subsequent work, which can shorten the time of road closure, shorten the time that obstructs traffic, and reduces toll revenue if the road is a highway. Can be made as small as possible. In addition, the removal work can be performed safely because it can be removed while securely supporting the garter.

[Brief description of drawings]

FIG. 1 is a side view of a bridge to be removed according to the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a plan view of the garter installed according to the present invention.

FIG. 4 is a plan view of the same when a support member is provided.

FIG. 5 is a perspective view of the garter of the same.

FIG. 6 is a side view of the same when the bridge is lifted.

FIG. 7 is a front view of the same when the bridge is removed.

[Explanation of symbols]

 1 Road 2 Bridge 3 Strut 4 Strut 5 Bridge 7 Horizontal Separation Part 8 Horizontal Separation Part 10 Vertical Separation Part 11 Vertical Separation Part 13 First Garter 14 Second Garter 15 Crane 18 Rail 20 Wheel 21 Supporting Member 22 Supporting Member 23 Hydraulic Jack 24 Bolt 25 Hole 26 Nut

Claims (1)

[Claims] 1. A garter with rails is laid on both sides of the bridge to be removed, and the bridge whose both ends are separated by a supporting member that runs on the rails of both garters is hung and run to remove the bridge at a predetermined position. A method of removing a bridge characterized by removing a garter.