JP3702263B2 - Bridge replacement method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bridge replacement method in which an existing bridge is removed and a new bridge is installed.
[0002]
[Prior art]
In general, in a conventional bridge replacement method, a method of installing a new bridge after removing an existing bridge is adopted, and various methods have been proposed as this type of method.
[0003]
As a conventional bridge replacement method, for example, a temporary abutment in which a first temporary guide rail is laid on the upper surface is constructed on the side of an old bridge that requires replacement, and the first temporary guide rail is moved. A new bridge temporary erection process in which a new bridge is temporarily installed on a temporary abutment with possible universal support, and the old bridge and old substructure are removed while the traffic is routed using this new bridge as a temporary bridge. A new substructure with this guide rail laid on the upper surface is newly constructed at the replacement position after the process and the old bridge and substructure are removed, and laid between this guide rail and the first temporary guide rail. The new bridge is moved from above the temporary abutment to above the new substructure while moving the free support from the first temporary guide rail to the main guide rail through the second temporary guide rail. Install on the new substructure And Hashimoto erection process, after erection of Shimbashi on the new substructure, it has bridges hung replacement method, characterized in that includes a temporary abutment removal step of removing the said temporary abutment and the temporary guide rails. (See Patent Document 1).
[0004]
[Patent Document 1]
JP 2002-167715 A (page 1-4, FIG. 1)
[0005]
[Problems to be solved by the invention]
By the way, in the above conventional bridge replacement method, when it is impossible to install a temporary bridge due to the surrounding conditions when replacing an existing bridge with a new bridge, traffic that originally passes over the bridge is closed. Therefore, there has been a problem that the social loss is increased due to traffic interruption or traffic congestion on the detour. Even if it is possible to install a temporary bridge, a separate detour that allows traffic to pass during the replacement period will be installed separately, and the detour will be removed after the replacement is completed. There was a problem that necessary equipment costs were wasted. In particular, in the case of a bridge as described in the above publication, a temporary abutment necessary to support the new bridge is built on the side of the existing bridge by using a large new bridge for the temporary bridge. Moreover, since the temporary abutment must be removed after the replacement is completed, it is difficult to obtain effective economic efficiency. In addition, a detour that passes through the temporary side is necessarily required, and installation in a place where a detour cannot be provided becomes difficult.
[0006]
The present invention has been made in consideration of such circumstances, and bridges that quickly replace bridges, shorten bridge replacement periods, and minimize social and economic losses. The purpose is to provide a replacement method.
[0007]
[Means for Solving the Problems]
The present invention employs the following means in order to solve the above problems.
The invention according to claim 1 is a bridge replacement method for replacing an existing bridge installed at a bridge installation position with a new bridge, wherein the new installation is performed at a new bridge temporary installation position provided in parallel with the bridge installation position. after waiting a bridge while supporting the bottom surface, when moving the existing bridges, and at the same time is slid while supporting a bottom of the new bridge, existing provided in parallel with the bridge installation position The existing bridge is slid in a state where the bottom surface is supported at a temporary bridge placement position.
[0008]
According to the present invention, the time required for the replacement work is greatly reduced by moving the existing bridge and moving the new bridge at the same time, thereby greatly reducing the time required for the replacement work. There is no need to install a detour.
Then, by moving the existing bridge to the existing bridge temporary placement position provided in parallel with the bridge installation position, the existing bridge is quickly replaced with the new bridge at the bridge installation position.
Furthermore, by sliding the existing bridge while supporting the bottom of the existing bridge, and simultaneously sliding the new bridge to the bridge installation position while supporting the bottom of the new bridge, the existing bridge and the Since the new bridge slides, the existing bridge and the new bridge slide quickly.
[0012]
According to the present invention, the existing bridge is slid while supporting the bottom surface of the existing bridge, and at the same time, the new bridge is slid to the bridge installation position while supporting the bottom surface of the new bridge. Therefore, the existing bridge and the new bridge slide, so that the existing bridge and the new bridge slide quickly.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram showing an existing bridge and a new bridge located on a river.
In FIG. 1, an existing bridge 1a is installed on a river R in a direction intersecting with the direction in which the river R flows, and telescopic devices 81a and 82a are provided at both ends thereof to be connected to roads 81 and 82. Positioned at position 80. The new bridge 1b is installed at a new bridge temporary placement position 83 in parallel with the existing bridge 1a. The existing bridge 1 a and the new bridge 1 b are supported by a construction pier 90 whose bottom surface is erected from the bottom surface of the river R. This construction pier 90 is installed to extend in the direction in which the river R flows so that the existing bridge 1a and the new bridge 1b can be moved at the time of replacement.
A plurality of existing bridge temporary receiving vents 92 are arranged at the existing bridge temporary placement position 84 located at the end 90a of the construction pier 90 extending in the moving direction of the existing bridge 1a. The existing bridge temporary receiving vent 92 is erected from the bottom surface of the river R, and has a structure in which the existing bridge 1a can be placed thereon.
[0014]
FIG. 2 is a diagram showing an existing bridge 1a and an erection jack attached to the existing bridge 1a.
The existing bridge 1a includes a floor plate 2a provided on the upper surface thereof, and a cross beam 3a as a beam provided on the lower surface of the floor plate 2a. Construction jacks 10 are installed on both side surfaces of the cross beam 3a.
The new bridge 1b includes a floor plate 2b provided on the upper surface thereof and a cross beam 3b as a beam provided on the lower surface of the floor plate 2b. Construction jacks 10 are installed on both side surfaces of the cross beam 3b.
Here, since the construction of the erection jack 10 attached to the existing bridge 1a and the new bridge 1b is the same, the erection jack 10 attached to the existing bridge 1a will be described, and the erection jack attached to the new bridge 1b. About 10, the same code | symbol is attached | subjected to the same component and description is abbreviate | omitted.
[0015]
The erection jack 10 includes a fixed part 20, a bar 30, a jack part 40, and a base part 50.
The fixed portion 20 has a central portion 21 that is formed in a cylindrical shape in the vertical direction, and is configured such that a screw is cut over its entire length.
A protruding portion 22 that protrudes to a position far away from the central portion 21 is provided on the side portion of the fixed portion 20, and a connecting portion 23 that connects the existing bridge 1 a is provided on the protruding portion 22.
The connecting portion 23 is fastened and fixed to a rectangular connecting member 3a fixed to the side surface of the cross beam 3 by welding or bolts.
Further, a stopper 24 is provided below the fixed portion 20 so that the fixed portion 20 is prevented from dropping downward.
[0016]
The bar 30 is fitted to the fixed portion 20 to support the fixed portion 20, and is threaded over the entire length of the relatively thick pipe material, and extends downward from the fixed portion 20. Is provided. The bar 30 is fitted to the fixed portion 20 so that the vertical movement of the fixed portion 20 can be guided. However, in the case of this invention, since the fixing | fixed part 20 is not used as an operating member, it is fixed and installed in the upper part of the bar 30.
[0017]
As shown in FIG. 3, the jack portion 40 has a central portion 41 formed in a cylindrical shape in the vertical direction, and is configured to be screwed over its entire length.
The side of the jack portion 40 is provided with a protruding portion 42 that protrudes to a position that is largely separated from the central portion 41. The protruding portion 42 is fixed to the jack portion 40 and is placed on the construction pier 90. A connecting portion 43 that connects the placed base portion 50 is provided.
The connecting portion 43 is fastened and fixed with a bolt to a rectangular connecting member 50a fixed to the side surface of the base portion 50 by welding or bolts.
[0018]
Further, the jack portion 40 surrounds the bar 30 so as to be movable with respect to the bar 30, that is, has a configuration in which the bar 30 is fitted.
A stopper 44 is provided on the lower side of the jack portion 40 so that the jack portion 40 is prevented from dropping downward.
[0019]
The base part 50 is a substantially rectangular pedestal with the jack part 40 connected to the side surface thereof. The base part 50 is interposed between the base part 50 and the construction pier 90 at the lower part thereof, and moves the existing bridge 1a. A plurality of slide jacks 51 are installed as sliding members. For example, the slide jack 51 is provided with a piston that moves up and down by hydraulic pressure at the top of the cylinder, and a sliding member made of synthetic resin that protrudes from the lower end of the cylinder by the action of the hydraulic pressure at the bottom.
[0020]
Although not shown, the construction pier 90 is installed on top of a plurality of piles erected from the bottom surface of the river R and is made of a steel plate. In the construction pier 90, a plurality of through holes 91 are arranged so that the bar 30 can penetrate in the vertical direction at a position where the existing bridge 1a is jacked up or jacked down.
Here, when the existing bridge 1 a is located near the construction pier 90, the mounting position of the fixing portion 20 is also located near the construction pier 90. Therefore, in this case, the lower portion 30 a of the bar 30 extending downward from the fixed portion 20 is positioned below the through hole 91.
[0021]
Next, a bridge replacement method having the above configuration will be described.
In this bridge replacement method, after the existing bridge 1a and the roads 81, 82 are cut off, the existing bridge 1a is moved from the bridge installation position 80 to the existing bridge temporary placement position 84 with its bottom surface supported, and the new bridge 1b is moved from the newly installed bridge temporary placement position 83 to the bridge installation position 80 with its bottom surface supported, and the newly installed bridge 1b is connected.
[0022]
FIG. 4 shows a flowchart of this bridge replacement method.
First, temporary equipment necessary for the replacement of the existing bridge 1a and the new bridge 1b is performed (step S10). This temporary installation work is, for example, installation work of a construction pier 90 and an existing bridge temporary receiving vent 92.
Next, the new bridge 1b is assembled as an operation of the new bridge 1b (step S11). The paving work is completed on the floor board 2b provided in the new bridge 1b (step S12). Thereafter, an additive such as a water pipe, a gas pipe, and an electric pipe is installed on the new bridge 1b (step S13), and a rail is installed (step S14). Then, the construction jack 10 is installed on the new bridge 1b (step S15). That is, the erection jacks 10 are respectively arranged at a plurality of appropriate positions on the new bridge 1b, and the erection jacks 10 are installed on the side surfaces of the cross beams 3b included in the new bridge 1b to connect the erection jacks 10 to each other. The portion 23 and the connecting member 3e provided on the side surface of the cross beam 3b are fastened and fixed with bolts. In this state, the new bridge 1b is put on standby.
[0023]
Further, as the work of the existing bridge 1a, the telescopic devices 81a and 82a connecting the existing bridge 1a and the roads 81 and 82 are removed (step S31). In the work of step S31, before starting the work, the traffic passing through the existing bridge 1a is blocked, and the work of step S31 is performed in the construction period of about one night. After the work is completed, the existing bridge 1a and the roads 81 and 82 are completed. Are temporarily restored by connecting them with a lining plate, and traffic is opened.
[0024]
Thereafter, the additive provided in the existing bridge 1a is removed and moved (step S32), the rail is cut (step S33), and the support is cut (step S34). If necessary, the reinforcement necessary for jacking up the existing bridge 1a is attached to the existing bridge 1a (step S35), and the support necessary when the new bridge 1b is installed at the bridge installation position 80 is provided on the road. It fixes to the position where 81 and 82 and the newly installed bridge 1b connect (step S36). And the construction jack 10 is installed in the existing bridge 1a (step S37). That is, the erection jacks 10 are respectively arranged at a plurality of appropriate positions on the existing bridge 1a, and the erection jacks 10 are installed on the side surfaces of the cross beams 3a provided on the existing bridge 1a, so that the linking jacks 10 are connected. The part 23 and the connecting member 3d provided on the side surface of the cross beam 3a are fastened and fixed with bolts.
These operations, that is, the operations of steps S11 to 16 and S31 to 36, are preferably performed during a river drought period.
[0025]
After the installation jack 10 is installed on the existing bridge 1a and the new bridge 1b, the existing bridge 1a is jacked up (step S38), the new bridge 1b is jacked up (step S16), and the existing bridge 1a is installed at the bridge installation position 80. To the existing bridge temporary placement position 84 (step S39), and the new bridge 1b is moved from the new bridge temporary placement position 83 to the bridge installation position 80 (step S17).
[0026]
That is, all the jack portions 40 are simultaneously pressurized and driven to jack up the existing bridge 1a and the new bridge 1b to a predetermined position. After the existing bridge 1a and the new bridge 1b are jacked up to a predetermined position, the stopper 44 provided on the lower side of the jack part 40 is rolled up and fastened to release the pressure on the jack part 40. While maintaining this state, the slide jack 51 is set in a slidable state, and the existing bridge 1a and the new bridge 1b are moved to predetermined positions while supporting the respective bottom surfaces by an external transfer means (not shown). Then, after the existing bridge 1a and the new bridge 1b are moved to predetermined positions, the slide jack 51 is set in a non-slidable state. When the existing bridge 1a and the new bridge 1b are moved, as shown in FIG. 5, the existing bridge 1a and the new bridge 1b are jacked up by the erection jack 10, whereby the lower portion 30a of the bar 30 is moved to the construction pier 90. Therefore, the existing bridge 1a and the new bridge 1b can be moved in this state.
Further, in the operations in steps S16-17 and S38-39, before starting the operation, the traffic passing through the existing bridge 1a is blocked, and these operations are performed in a construction period of about one night.
[0027]
After the new bridge 1b is moved from the new bridge temporary placement position 83 to the bridge installation position 80, the new bridge 1b is jacked down and fixed at a position where the roads 81 and 82 and the new bridge 1b are connected to each other. Is installed (step S18). That is, the jack portion 40 is pressurized, the stopper 44 is lowered, all the jack portions 40 are simultaneously pressurized and driven, and the new bridge 1b is jacked down to a predetermined position. After jacking down the new bridge 1b to a predetermined position, the pressure on the jack portion 40 is released. Thereafter, since the erection jack 10 is not necessary, the erection jack 10 attached to the new bridge 1b is removed.
After the installation is completed, the newly constructed bridge 1b and the roads 81 and 82 are connected to each other by a lining plate and temporarily restored (step S19), and traffic is opened. Then, an additive is attached to the new bridge 1b (step S20).
[0028]
Thereafter, telescopic devices 81a and 82a for connecting the newly installed bridge 1b and the roads 81 and 82 are attached (step S21). In the work of step S21, before starting the work, the traffic passing through the new bridge 1b is blocked, and the work of step S21 is performed in the construction period of about one night. After the work is completed, the new bridge 1b and the roads 81 and 82 are completed. Are connected by the telescopic devices 81a and 82a to open traffic.
[0029]
In the existing bridge 1a, the existing bridge 1a is moved from the bridge installation position 80 to the existing bridge temporary placement position 84, and then temporarily placed on the existing bridge temporary receiving vent 92 as it is (step S40). That is, the jack portion 40 is pressurized, the stopper 44 is lowered, all the jack portions 40 are simultaneously pressurized and driven, and the existing bridge 1a is jacked down to a predetermined position. After jacking down the existing bridge 1a to a predetermined position, the pressure on the jack portion 40 is released. Thereafter, since the erection jack 10 is not necessary, the erection jack 10 attached to the existing bridge 1a is removed.
The existing bridge 1a is dismantled at that position (step S41). The disassembled member is removed from the position and carried out (step S42).
[0030]
In this case, the period during which the traffic is blocked is one night when the extension devices 81a and 82a of the existing bridge 1a are removed, one night when the existing bridge 1a and the new bridge 1b are replaced, and the new bridge 1b. Since there are only a total of three times a night when attaching the telescopic devices 81a and 82a, there is no need to separately install a traffic detour when replacing the existing bridge 1a and the new bridge 1b. Further, since the time required for the replacement work is completed overnight, the time required for the replacement work is greatly reduced.
[0031]
According to the above configuration, since it is not necessary to separately install a traffic detour, the cost of installing the detour can be reduced, and economic loss can be minimized. In addition, the replacement period between the existing bridge 1a and the new bridge 1b is shortened, thereby shortening the replacement period, so that it is possible to minimize social loss due to traffic interruption due to the replacement work. .
[0032]
It should be noted that the period during which the traffic is blocked is one night when the extension devices 81a and 82a of the existing bridge 1a are removed, one night when the existing bridge 1a and the new bridge 1b are replaced, and the new bridge 1b. Although it is said that it will be only a total of three times a night when attaching the expansion-contraction apparatuses 81a and 82a, this period and frequency | count are not limited. By appropriately setting the period and the number of times according to the scale of construction, the effect obtained by the present invention is greater than that of the conventional method.
[0033]
【The invention's effect】
The bridge replacement method of the present invention described above has the following effects. According to the first aspect of the invention, by replacing the existing bridge and the newly installed bridge at the same time, the time required for the replacement work can be greatly shortened. Since there is no need to install a detour, it is possible to minimize the social loss associated with the interruption of traffic due to the replacement work, and the equipment cost for installing the detour is reduced. Economic losses can be minimized.
[0034]
According to the second aspect of the present invention, the existing bridge can be quickly installed on the new bridge at the bridge installation position by retracting the existing bridge to the existing bridge temporary placement position provided in parallel with the bridge installation position. Therefore, it is possible to minimize the social loss caused by the interruption of the traffic due to the replacement work, and the equipment cost for installing the detour is reduced. It can be minimized.
[0035]
According to the invention of claim 3, by moving the existing bridge while supporting the bottom surface of the existing bridge, and simultaneously moving the new bridge to the bridge installation position while supporting the bottom surface of the new bridge, Existing bridges and new bridges will be moved quickly, so it is possible to minimize social losses due to traffic interruptions due to replacement work, and equipment costs for installing detours. Therefore, the economic loss can be minimized.
[Brief description of the drawings]
FIG. 1 is a layout diagram of an existing bridge and a new bridge according to an embodiment of the present invention.
FIG. 2 is a front view of a construction jack according to the embodiment of the present invention.
FIG. 3 is a partially enlarged view of a construction jack according to the embodiment of the present invention.
FIG. 4 is a flowchart of a bridge replacement method according to the embodiment of the present invention.
FIG. 5 is a front view of a construction jack according to the embodiment of the present invention.
[Explanation of symbols]
1a Existing bridge 1b New bridge 10 Construction jack

Claims (1)

A bridge replacement method for replacing an existing bridge built at a bridge installation position with a new bridge,
A state in which the new bridge is supported on the bottom surface when the existing bridge is moved after waiting for the newly installed bridge in a state where the bottom surface is supported at a new bridge temporary placement position provided in parallel with the bridge installation position. At the same time as sliding
A method of replacing a bridge, wherein the existing bridge is slid in a state where a bottom surface is supported at an existing bridge temporary placement position provided in parallel with the bridge installation position.

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