JP4098581B2 - Overpass bridge construction method - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a method for replacing a bridge.
[0002]
[Prior art]
Conventionally, the following methods are used to remove an existing overpass bridge installed on a road in service and construct a new overpass bridge.
(1) Guide the passing vehicle to the detour road, completely stop the road in service, and perform the construction of the overpass on the lower road surface. However, this method cannot be applied when a detour road cannot be secured.
(2) Half of the lanes of the road in service are alternately closed, and the existing overpass is dismantled and removed from the closed lane. Build a new bridge over the bridge. However, this method is not applicable to highways in urban areas where traffic is heavy because traffic regulation over a long period of time is necessary.
(3) Night traffic restriction on the road in service, the existing overpass bridge is removed with a crane and transported with a trailer, and then a new overpass bridge is constructed by installing steel girders or precast concrete girders. To do. However, this method cannot be applied to overpasses that have a high weight, such as precast concrete bridges, because the lifting capacity of cranes and trailer loading capacity that can be installed on roads in service are limited. .
(4) Nightly traffic restriction on the road in service, and the existing overpass bridge that has been removed in bulk is transported to a work yard by a large special cart, and the existing overpass bridge is dismantled in this work yard, and then steel girders or precast Build a new overpass with concrete girders. However, this method is not applicable when the work yard cannot be secured near the overpass.
(5) Night traffic restrictions on the roads in service, and the existing overpass bridge will be removed at once using an erection girder, and then a new overpass bridge will be constructed by installing steel girders or precast concrete girders. However, this method requires a wide work yard for disassembling the bridge body by assembling a construction girder on the back surface of the abutment, and therefore cannot be applied when this work yard cannot be secured.
[0003]
As explained above with regard to conventional methods, the economic loss caused by traffic regulation over several days is enormous on highways in the metropolitan area where traffic volume is very high and traffic congestion frequently occurs. It is difficult to obtain permission from the road administrator. Therefore, it is impossible to apply a construction method that divides, removes, and replaces existing overpass bridges in lane restrictions.
In addition, it is difficult to secure a work yard adjacent to an overpass in an environment where private houses and stores are lined up nearby. This is because it takes too much time to negotiate evictions, and it is not possible to obtain permission for private use from the authorities on high-traffic highways.
Furthermore, there is currently no detour on the main road that performs the same function. Even if there is a detour, traffic congestion on the detour is inevitable. In construction methods such as collective erection and removal, split construction is not efficient, and it is virtually impossible to secure traffic on the overpass.
[0004]
[Problems to be solved by the invention]
The present invention has been made in order to solve the above-described problems, and the problem is that the roadway located below the existing overpass bridge can be closed and traffic control can be minimized. The purpose is to provide a bridge replacement method.
[0005]
Another problem of the present invention is that it is not necessary to secure the land around the construction site as a work yard even in an overpass bridge located in an environment where private houses and stores are lined up nearby, and the overpass bridge capable of shortening the construction period It is to provide a replacement construction method.
[0006]
Another problem of the present invention is that when determining the structure type of a new overpass, for example, it is not limited to steel girders or precast concrete girders that can be laid at night, but other structural types. The purpose is to provide an overpass bridge construction method that allows selection.
[0007]
Furthermore, another problem of the present invention is that it is possible to determine the dismantling / removal method of the existing overpass and the construction method of the new overpass without being restricted by road traffic located below the existing overpass The purpose of this project is to provide a method for replacing the overpass bridge.
[0008]
Another subject of the present invention is a method of replacing the overpass that can secure the traffic of the overpass even when the existing overpass is removed and a new overpass is installed. Is to provide.
[0009]
[Means for Solving the Problems]
According to the present invention, a road protection body having a predetermined length that can cover the upper side and the side of the road and through which a vehicle can pass is formed in advance in the work yard, and the road protection body is transported from the work yard. Installed below the overpass, covering the upper and side of the predetermined section of the road that passes from the left and right sides below the overpass with the road protection body, working equipment on the road protection body and While installing construction materials and using the road protection body as a work yard and material storage area, the work of removing the existing overpass and the work of constructing a new overpass are performed by the road protection body. An overpass bridge construction method characterized by the above is provided.
In the present invention, a road protection body is installed below the overpass, and a predetermined section of the road passing from the left and right sides below the overpass is covered with the road protection body, thereby dismantling and removing the existing overpass bridge. It is now possible to prevent falling of construction materials and concrete pieces on the road when the bridge is newly constructed. Accordingly, traffic regulation of the road below the bridge bridge is not required except during the process of transporting the road protection body and installing it on the road below the bridge bridge, and traffic closure and traffic regulation can be minimized. Therefore, it has become possible to determine the dismantling / removal method of the existing overpass and the construction method of the new overpass without being restricted by the road traffic located below the existing overpass.
[0010]
In the present invention, a road protector is provided in a predetermined section from the front to the back of the overpass on the road located below the overpass, and the road protector covers the upper side and the side of the road. The road protection body may be used at least as a place for installing work equipment, and further, the road protection body may be used as a construction material storage place. Therefore, according to such a construction method, it is not necessary to secure the land around the construction site as a work yard even in an overpass bridge located in an environment where private houses and stores are lined up nearby, and the construction period can be shortened. . In addition, since it is not necessary to occupy the road below the overpass with materials and equipment during construction, the construction form of the new overpass can be freely selected without being restricted by the construction time.
[0011]
In the present invention, a road protector is installed below the existing overpass so as to cover the road below the existing overpass, and a plurality of jacks are installed between the road protector and the existing overpass, The existing overpass bridge may be cut while supporting the existing overpass bridge with the road protection body through the plurality of jacks. Therefore, according to such a construction method, it becomes possible to remove one side at a time while supporting the overpass with a jack, and even when the overpass is being replaced, the traffic of the overpass itself It became possible to maintain.
[0012]
In the present invention, in the process of constructing a new overpass, the road protection body may be used as a support for the bridge, and therefore it is subject to restrictions due to road traffic located below the overpass. It is now possible to determine the construction method for the newly constructed overpass.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings.
FIG. 1 is a plan view in one step of the method of replacing the overpass 10, FIG. 2 is a side view of the overpass 10 in FIG. 1 viewed from the left side, and FIG. 3 is the road protection body 20 in FIG. 1. FIG. 4 is a cross-sectional view of the road protection body 20 of FIG. 1 cut along the lane.
In FIG. 1, a main road 11 is provided with two upper and lower lanes, and a space provided on the shoulder of the main road 11 is used as a work yard 12 when assembling a road protection body. Further, an overpass 10 is installed above the main road 11, and one lane is provided for each of the upper and lower lanes.
The main road 11 is provided with a road protection body 20 for each vertical line so as to cover a predetermined section from the front to the rear of the overpass 10 and pass under the overpass 10. As shown in FIG. 2, a space through which the vehicle can pass is secured inside the road protection body 20. Each road protection body 20 includes a plurality of frames 21 formed in a U-shape by connecting a pair of vertical members 21b with horizontal members 21a on a horizontal beam 23 at a predetermined interval. The steel plate 22 is attached to the structure. Further, the road protection body 20 is formed to have a sufficient structural strength and to have a flat upper surface so that construction materials and work equipment can be placed on the upper surface. The horizontal beam 23 of the road protection body 20 is fixed on a base 24 for height adjustment extended in the lane direction on both sides of the median strip and the lane.
The frame 21 and the horizontal beam 23 can be made of H-shaped steel.
[0014]
In the overpass bridge replacement method according to the present invention, the road protection body 20 is formed in advance in the work yard 12, the road protection body 20 is transported from the work yard 12 to below the overpass 10, and the trunk road below this road 11, a predetermined length from the front to the rear of the overpass 10 in the road 11 is covered with the road protector 20, and the work of removing the existing overpass 10 and the work of constructing a new overpass are performed on the road protector 20. It is characterized by being performed by.
[0015]
Hereinafter, the replacement method of the overpass 10 according to the present invention will be described in more detail with reference to FIGS. 5 and 6.
<Assembly and installation process of road protection body>
First, a work yard 12 is provided on the shoulder of the main road 11 near the overpass 10. In this work yard 12, since the road protection body 20 is only assembled, it is not necessary to secure a very large area, and it is desirable that the width is about 7 to 10 m and the length is about 30 to 40 m. In addition, height adjustment bases 24 are provided in advance on the median strip and on both sides of the lane at the planned installation location of the road protection body 20.
Next, the small crane 30 or a frame 21 and a horizontal beam 23 formed in advance at a factory or the like are carried into the work yard 12, and a pair of horizontal beams 23 are arranged in parallel by the small crane 30. If the steel plates 22 are attached to both side surfaces and the upper surface of the frame 21, the assembly work of the road protection body 20 is completed.
After removing the portion shown by the dotted line of the median strip 11c in FIG. 5 (a) and blocking all the upper and lower lanes, the special large carriage 32 is placed inside the road protection body 20 and lifted slightly upward, The large carriage 32 is moved as indicated by the arrow M, and the road protection body 20 is conveyed to the lower side of the overpass 10 in the lane 11B. The road protection body 20 is lowered below the overpass 10 and the horizontal beam 23 is placed on the height adjustment base 24 and fixed. When only the narrow work yard 12 can be secured on the shoulder of the road, a short road protection body 20 may be formed, and each time it may be formed by transporting it under the overpass 10 and connecting a plurality thereof.
Next, the road protection body 20 installed in the lane 11 </ b> A is similarly assembled in the work yard 12, transported by the special large cart 32, and installed under the overpass 10.
In addition, you may arrange | position the protection body 33 under the overpass 10 on the sidewalk along the upper and lower lanes 11A and 11B. The protective body 33 can be made of precast concrete in which both side surfaces and the ceiling surface are integrally formed, and is formed in a hollow shape so that a pedestrian can pass through the inside.
[0016]
<Equipment installation process on road protection body>
When the installation of the road protection body 20 in both the upper and lower lanes 11A and 11B is completed, the work platform vertical beam 28 as shown in FIGS. 3 and 4 is installed on the road protection body 20, and the work platform is placed thereon. A horizontal girder 27 is installed, and a lining plate 26 is installed thereon. When there is a step between the lining plate 26 and the bridge 10, an approach road (not shown) is installed on the lining plate 26. A handrail 29 and a safety net (not shown) are installed around the upper surface of the road protection body 20. A jack 25 is installed between the road protection body 20 and the existing overpass 10 in the arrangement as shown in FIG.
Next, as shown in FIG. 5 (b), the small crane 30 is advanced from the overpass 10 onto the road protection body 20 and placed on the lining plate 26.
[0017]
<Removal / new construction process of one side lane of overpass>
When the materials and equipment on the road protection body 20 have been brought in, only the one side lane 10A of the existing overpass 10 is allowed to pass, the one side lane 10B is stopped, and the girder, beam, floor slab of the one side lane 10B. Etc. are supported by the jack 25, and an operation such as cutting a girder, beam, floor slab, etc. of the one-side lane 10B is performed using a device such as a wire saw. All of the removal work of the existing overpass 10 is performed on the road protection body 20. When the cut overpass is lifted by the small crane 30 and carried out by the transport vehicle, as shown in FIG. 6A, the one side lane 10B of the existing overpass 10 is removed, and the one side lane of the existing overpass 10 is removed. Only 10A is left in traffic.
Next, a new overpass is installed in the one-side lane 10B while using the road protection body 20 as a work yard and a material storage. This new overpass is not particularly limited in its structural form, and can be constructed from, for example, cast-in-place concrete, precast concrete members, steel girders, and the like.
[0018]
<Removal / new construction process of the remaining lane on the overpass>
When the removal work of the one-side lane 10B of the existing overpass 10 and the construction work of the new one-side lane 10B are completed, only the new one-side lane 10B of the overpass 10 is allowed to pass. Make it closed. Then, as shown in FIG. 6 (b), the existing one-side lane 10A is removed as a result of construction in the same manner as described above while using the road protection body 20 as a work yard and a material storage place. Only the one-side lane 10B is left in a passable state. Furthermore, the construction of a new one-side lane 10A is also completed by performing construction in the same manner as described above.
[0019]
As described above, in both the upper and lower lanes 11A and 11B of the main road 11, the predetermined section from the front to the rear of the bridge 10 is covered with the road protection body 20, and the road protection body 20 has a vehicle inside. Since it is formed so as to ensure a passable space, traffic regulation of the main road 11 is not required except for the step of transporting the road protection body 20 and installing it on the main road 11 below the overpass 10. It became possible to minimize traffic closures and traffic restrictions.
[0020]
【The invention's effect】
In the overpass bridge construction method of the present invention, a road protector is installed below the overpass, and a predetermined length from the front to the back of the overpass on this road is covered with the road protector, Since vehicles traveling on the road can pass inside the road protection body, traffic control on the road below the overpass is unnecessary, except for the transportation and installation process of the road protection body. Can be minimized. In addition, by removing and constructing the overpass one by one, it is possible to secure the traffic of the overpass itself.
[Brief description of the drawings]
FIG. 1 is a plan view showing an embodiment of the present invention.
FIG. 2 is a side view of the overpass in FIG. 1 as viewed from the left side.
FIG. 3 is a side view of the road protection body in FIG. 1 as viewed from the right side.
4 is a cross-sectional view of the road protection body in FIG. 1 cut along a lane.
5 (a) and 5 (b) are plan views showing one step in the overpass bridge replacement method according to the present invention.
FIGS. 6A and 6B are plan views showing steps subsequent to FIG.
[Explanation of symbols]
10 Overpass 11 Main road (downward road)
12 work yard 20 road protection body 26 lining board 30 small crane

Claims (3)

A road protection body of a predetermined length that can cover the upper side and the side of the road and allows a vehicle to pass through is formed in advance in the work yard, and the road protection body is transported from the work yard and below the overpass. Cover the upper and side of the predetermined section of the road passing from the left and right sides below the overpass with the road protection body, and install work equipment and construction materials on the road protection body. The above-mentioned road protection body is used as a work yard and a material storage place, and the work of removing the existing overpass and the work of constructing a new overpass are performed on the road protection body. The construction method of the overpass bridge.   In the step of removing the existing overpass, a plurality of jacks are installed between the road protector and the existing overpass, and the existing straddle is installed by the road protector via the plurality of jacks. 2. The overpass bridge replacement method according to claim 1, wherein the existing overpass bridge is cut while supporting the bridge.   2. The overpass bridge replacement method according to claim 1, wherein, in the step of constructing a new overpass, the road protection body is used as a bridge support.

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