JP4796411B2 - Bridge removal method - Google Patents

Description

  The present invention relates to a method for removing a bridge over a river or the like, and more particularly, to a collective removal method for a bridge capable of sequentially removing an upper work and a lower work constituting a bridge by work from above the bridge.

  In the conventional method of removing bridges over rivers, etc., the method of dividing and removing them by crushing them sequentially with a large breaker, etc. Is used to sequentially remove the superstructure and substructure divided into sizes corresponding to the crane's suspension capacity.

  Therefore, the construction period may be restricted depending on the amount of water flowing in the river, etc. Especially during the flood season (June to October) when the amount of flowing water increases due to the rainy season or typhoon, the construction in the river etc. is restricted. Therefore, it is difficult to remove the bridge throughout the year.

Also, when dismantling the bridge, a marking line is drawn on the floor slab along the upper surface of the main girder, and the floor slab is sequentially divided and suspended by a crane to eliminate the risk of a falling bridge accident. An application has already been filed for a method of dismantling a floor slab in an old bridge dismantling work that is intended to prevent pollution of rivers and the like (for example, see Patent Document 1).
JP 2001-348814 A (page 1-5, FIG. 16)

  In the method of removing the bridge while crushing it, there is a problem that the concrete fragments fall and fly into the river etc., thereby polluting or contaminating the river etc. Moreover, in the construction method which removes while sequentially dividing using a crane, construction during the flood season is difficult, and the construction term for the whole year cannot be set.

  In addition, it was necessary to construct a gantry to install a crane or to prepare a trolley equipped with a crane.

  The purpose of the present invention is to solve the above problem, when removing a bridge over a river etc., it is not necessary to install a crane in the river etc. It is possible to remove the bridge and provide a bridge removal method that allows construction throughout the year.

  In order to achieve the above object, the invention according to claim 1 is directed to a lower work wall installed on a plurality of lower work footings arranged at predetermined intervals, and mounted on the lower work wall. A bridge lump removal method for removing a bridge over a river or the like, the first gate type standing on the first footing across the upper work and the lower work wall Provided with a jack, a second gate-type jack standing on the upper work positioned on the next second footing, and a third gate-type jack standing on the upper work positioned on the next third footing, A preparation step of installing a six-legged gate-type lifting means constructed integrally through a vertical beam connecting the upper part of the gate-type jack, and a span between the first gate-type jack and the second gate-type jack And said second gate type jack and said second A trolley that travels in the direction of the bridge axis along the trolley girder mounted on the transverse beam provided in each of the portal type jacks, and the trolley girder crosses the trolley girder in the direction perpendicular to the bridge axis. A superstructure removal step of dividing the superstructure of the removal span into a plurality of bridge axis directions through the moving means and sequentially raising it, transferring it to the loading span, and removing the superstructure, and the superstructure first removed After the lower construction wall is cut from the footing with a wire saw, etc., the trolley raises the first construction wall, transfers it to the upper construction of the loading span, and removes it. The means includes a portal-type lifting means moving step in which a traveling girder that is movable in the bridge axis direction is supported on the surface of the superstructure and moves integrally.

  According to the invention which concerns on Claim 1 which has said structure, a superstructure and a lower construction wall can be sequentially removed using the portal type lifting means provided with the jack part which straddles the superstructure of a bridge. For this reason, the work is performed on a bridge, and it is not necessary to provide a gantry in a river or the like, and it is not necessary to prepare a trolley with a crane.

  The invention according to claim 2 includes a lower work wall installed on a plurality of lower work footings arranged at predetermined intervals, and an upper work placed on the lower work wall. A bridge demolition method for removing bridges over rivers, etc., and a first gate type jack standing on a riverbed ground or support layer outside the first footing across the upper work and the lower work wall; A second gate-type jack standing on the superstructure located on the second second footing, and a third gate-type jack standing on the superstructure located on the next third footing. A preparation step of installing a six-legged gate-type lifting means integrally configured through a vertical beam connecting the upper part of the type jack, and a removal span between the first gate-type jack and the second gate-type jack, The second gate type jack and the third gate A trolley that travels in the bridge axis direction along a trolley girder that is mounted on a transverse beam provided in each portal-type jack, with a loading span between the jacks, and a moving means that traverses the trolley girder in a direction perpendicular to the bridge axis The upper work of the removal span is divided into a plurality of parts in the direction of the bridge axis and sequentially lifted up, transferred to the loading span and removed, and the first lower part from which the super work has been removed After cutting the wall from the footing with a wire saw or the like, the trolley lifts the first lower wall, or the first lower wall, the footing and the foundation pile in turn. The substructure removal process for transferring and removing to the upper construction of the loading span and the gate-type lifting means are integrally supported by a traveling girder movable in the bridge axis direction on the surface of the upper construction. Go to It is characterized in that it comprises a mold lift means moving step.

  According to the invention which concerns on Claim 2 which has said structure, it uses a portal type lifting means provided with the jack part which straddles the superstructure of a bridge and a footing, and a superstructure and a substructure wall only by the operation | work on a bridge Can be removed sequentially. In addition, because footing and foundation piles can be removed, it is usually necessary to increase the cross section of the running water even for substructure footings and foundation piles that are often left behind because they do not obstruct running water. In case of riverbed excavation, it is a method that can be easily handled.

  According to a third aspect of the present invention, in the superstructure removing step, the superstructure cutting step of cutting the superstructure into a size to be removed, and fixing the superstructure to the trolley, and fixing the fixed superstructure to the gate type An upper work transfer process for extending and lifting the jack of the lifting device and transferring it to the loading span; and an upper work unloading process for loading and unloading on an unloading vehicle waiting on the upper work surface of the loading span; It is characterized by having.

  According to the invention according to claim 3 having the above-described configuration, the divided superstructure is sequentially carried out by the carry-out vehicle moving on the bridge, so that the removal work can be performed only on the bridge.

  According to a fourth aspect of the present invention, the substructure removing step includes a substructure detaching step in which the substructure wall is fixed to the trolley and separated from the footing, and the separated substructure is jacked to the portal lifting means. A substructure transfer process for extending the sheet to the loading span, and a substructure unloading process for loading and unloading the unloading vehicle waiting on the surface of the superstructure of the loading span. It is a feature.

  According to the invention which concerns on Claim 4 which has said structure, the removal work of a substructure can also be performed only by the work on a bridge.

  In the invention according to claim 5, the traveling girder includes three sets of traveling carriages, and the three sets of traveling carriages are provided at intervals corresponding to three consecutive substructures. It is characterized by.

  According to the invention according to claim 5 having the above-described configuration, since the lower work receives the load of the traveling beam with a large span interval, the traveling beam can be moved without applying a load to the upper work.

  According to a sixth aspect of the present invention, in the gate-type lifting means moving step, the three sets of traveling carts are arranged at a lower part of the second gate-type jack, and a lower part of the third gate-type jack. After moving to the upper work at a position corresponding to three places of the third lower work and the next fourth lower work, in the state where the support carriage supports the portal lifting means, This is characterized in that it is a step in which the jacks of the legs are shrunk to support the portal lifting means together and move on the traveling beam.

  According to the invention according to claim 6 having the above-described configuration, when the portal type lifting means is moved by one span, the load is received by the traveling girder and further by the substructure through the traveling carriage. It is possible to move one span without applying a load and continue the new removal work.

  The invention according to claim 7 is a split type in which the traveling girders are separately provided on the left and right sides of the gate-type lifting means, and three sets of the traveling carriages are provided in each of the traveling girders.

  According to the invention concerning Claim 7 which has the above-mentioned composition, the installation process of each right and left traveling girder becomes easy, and the time required for the gate type lifting means moving process can be shortened.

  The invention according to claim 8 is characterized in that each of the traveling carriages is a carriage provided with four wheels.

  According to the invention which concerns on Claim 8 which has said structure, even if it is the traveling girder of the structure installed in each right and left, each traveling girder can be moved stably.

  According to the present invention, the superstructure in the removal span is removed and loaded through the six-legged portal lifting means that forms the removal span and the loading span with the portal jack straddling the superstructure and the substructure. Since the elevating means is configured to move integrally after being carried out to the span, it is possible to provide a collective bridge removal method that can be divided and removed sequentially for each span.

  Hereinafter, an embodiment of a collective bridge removal method according to the present invention will be described in detail with reference to FIGS. 1 to 4.

  FIG. 1 is a schematic explanatory view of removing an upper work using a six-legged portal lifting means according to the present invention, and (a) is a front view, a side view, and A showing a place where the upper work to be removed is lifted up. FIG. 4A is a view as viewed from the arrow A, and FIG. 4B is a front view, a side view, and a view as viewed from the arrow B-B showing the place where the upper work is lowered and placed on the carry-out vehicle. FIG. 2 is a schematic explanatory view of removing the substructure using the six-legged portal lifting means according to the present invention, and (a) is a front view, a side view, and C showing the place where the substructure to be removed is lifted up. It is a -C arrow view, (b) is the front view, side view, and DD arrow view which show the place which lowers a substructure and mounts it in a carrying-out vehicle. FIG. 3 is a schematic explanatory view for moving a six-legged portal lifting means according to the present invention. FIG. 3A is a front view, a side view, and an E- It is an E arrow line view, (b) is the front view, the side view, and the FF arrow line view which show the place which moved the portal type raising / lowering means 1 span. FIG. 4 is a flowchart showing the flow of the bridge lump removal method according to the present invention.

  The bridge lump removal method according to the present invention is a removal method that can be sequentially removed from the bridge without using a crane or the like that separately installs a bridge over a river or the like.

  As shown in FIG. 1, a bridge over a river or the like includes a plurality of superstructures 10, substructure walls 11, and substructure footings 12. Therefore, when removing the bridge, first, the superstructure 10 is divided and removed sequentially, and then the wall 11 is removed. Since the footing 12 is buried deeper than the river bed, it is usually unnecessary to remove it.

  First, a method of removing the superstructure using the six-legged portal lifting / lowering means 1 according to the present invention will be described with reference to FIG.

  As shown in FIG. 1A, the portal lifting / lowering means 1 includes a first portal jack 3, a second portal jack 4, a third portal jack 5 and a longitudinal beam 2A connecting them. This is a portal-type lifting means for the leg. Each portal-type jack includes a transverse beam 2B and two jack portions hanging from both sides of the transverse beam. For example, the first portal-type jack 3 has a transverse beam 2B and jack portions 3A, 3B. The second portal jack 4 includes a transverse beam 2B and jack portions 4A and 4B, and the third portal jack 5 includes a transverse beam 2B and jack portions 5A and 5B. In addition, a trolley girder 6 and a trolley 7 that connect the respective transverse beams 2B and extend in the bridge axis direction are provided.

  The first gate-type jack 3 is configured to be able to stand on the footing 12 across the upper work 10 and the wall 11 by widening the space between the jack portions 3A and 3B. The third gate-type jack 5 has a large interval between the jack portions and is erected on the upper work 10. Therefore, when installing the portal lifting / lowering means 1 on the bridge to be removed, first, the second portal jack 4 is erected on the upper work 10B located on the next second footing 12B, and the third portal. After the die jack 5 is raised on the upper work on the third footing 12C, the first portal-type jack 3 is raised on the first footing 12A so as to straddle the upper work 10 and the lower work wall 11A. 30 is a cutting line, and the upper work is cut before it is removed. This cutting can be performed by a conventional method of cutting with a wire saw or the like.

  A trolley girder 6 is attached to the transverse beam 2B in the direction of the bridge axis, and the trolley 7 including the lifting tool 8 is movable in the direction of the bridge axis (the direction of the arrow 6b in the figure). In addition, a moving means (not shown) is provided for moving the trolley girder 6 in a direction perpendicular to the bridge axis (in the direction of arrow 6a in the figure).

  Reference numeral 31 also denotes a cutting line, which is preliminarily cut into an upper work 10a having a size that can be lifted and removed by the trolley 7. This cutting can also be performed with a flat saw or the like as in the conventional method.

  Further, since the six-legged portal lifting / lowering means 1 is used, the first span between the first portal jack 3 and the second portal jack 4 and between the second portal jack 4 and the third portal jack 5 are used. A second span can be formed. Therefore, in the present embodiment, the first span is the removal span 20, and the second span is the loading span 21.

  Since it is configured as described above, the six-legged gate-type lifting means 1 is installed on each footing, and the upper work 10A in the removal span 20 is cut into an upper work 10a of a size that can be removed in advance. . Thereafter, the superstructure 10a is sequentially raised using the trolley 7, moved in the direction of the arrow 6b in the figure, and carried out to the loading span 21. The unloading vehicle 9 is waiting on the loading span 21, and the superstructure 10 a that has been unloaded is sequentially loaded onto the chassis 9 </ b> A.

  FIG. 1 (b) shows that all the superstructure of the removal span 20 has been removed, but the upper work is lifted and lowered during the superstructure removal process at the same time as the jack part of the portal lifting / lowering means 1. Can be done by stretching. That is, after fixing the hanging tool 8 to the upper work 10a, the upper work 10a is lifted by extending the jack portion in the direction of the upward arrow 40 shown in FIG. Then, the trolley 7 is moved in the direction of the arrow 6b to reach the loading span 21, and the jack portion is contracted in the direction of the downward arrow 41 in FIG. 1 (b) to be transferred onto the chassis 9A.

  At that time, all the loads of the superstructure raised up, the loads of the top plate 2 and the trolley girder 6 and the like are all supported by the footing 12 from the respective jack portions, and the superstructure is not damaged. For example, the load applied to the first jack portion 3 is supported by the first footing 12A, and the load applied to the second jack portion 4 is supported by the second footing 12B via the upper work 10 and the lower work wall 11, and the third The load applied to the jack portion 5 is configured to be supported by the third footing 12C via the upper work 10 and the lower work wall 11.

  Next, a method for removing the substructure will be described with reference to FIG.

  FIG. 2A shows the trolley 7 raising the first lower construction wall 11A from which the upper construction has been removed. At this time, it is clear that the lower construction wall 11A and the first footing 12A are separated. The fixing and raising of the first lower construction wall 11A is equivalent to the fixing and raising explained in the above-described upper construction removal method, and will not be described in detail here.

  The first lower construction wall 11A raised through the trolley 7 and the six-legged jack section is transferred to the upper construction 10B of the loading span 21 as shown in FIG. At this time, the wound substructure may be transported as it is and transferred to the unloading vehicle as it is. However, according to the size of the chassis 9A of the unloading vehicle, the 90 ° direction is changed as shown in the figure. It is also possible to do.

  As described above, the first lower wall 11A transported to the loading span 21 is transferred to the unloading vehicle 9 by simultaneously shrinking the jack portion of the portal lifting means 1 in the direction of the arrow 41. Also during the substructure removal process, the footing 12 supports all the loads of the substructure to be raised and the load of the gate type lifting means from the jack part of the hexapod, which may damage the bridge of the superstructure. There is no.

  Next, a method for moving the six-legged portal lifting means 1 according to the present invention will be described with reference to FIG. After removing the first upper work 10A and the first lower work wall 11A, the portal lifting / lowering means 1 is moved integrally through the traveling girder 50 installed at a predetermined position of the upper work 10B and 10C. To do.

  The traveling girder 50 includes a first traveling girder 50A and a second traveling girder 50B, and each traveling girder includes a traveling carriage 51A and 51B, respectively. Further, these traveling girders may be connected to form an integrated traveling girder 50.

  A support carriage 53 can be attached to the jack portion of the portal type lifting means via a bracket 52, and the first traveling girder 50A has a support carriage 53A that supports a jack portion on one side (for example, the jack portions 4A, 5A). And a support carriage 53B that supports the opposite jack portion (for example, the jack portions 4B and 5B) is placed on the second traveling girder 50B.

  At this time, the support carriage 53 can be directly attached to the lateral beam 2B in addition to the method of attaching to the jack portion via the bracket 52.

  The traveling girder 50 has a length corresponding to two spans of the bridge, and traveling carriages 51 (51A, 51B) are provided at three positions at positions corresponding to the pitches of the respective substructures. For example, the traveling carriage 51A includes a traveling carriage 51Aa located directly above the second lower construction wall 11B, a traveling carriage 51Ab located directly above the third lower construction wall 11C, and a fourth lower construction wall. And a traveling carriage 51Ac located directly above 11D.

  Therefore, when the traveling girder 50 is installed at the work position on the bridge shown in FIG. 3A, all the loads are supported by the footings 12B, 12C, and 12D.

  In this state, the intermediate portions of the jack portions are supported by the support carts 53A and 53B. Thereafter, when the respective jack portions are contracted in the direction of the arrow 40 in the drawing, the respective jack portions are separated from the upper work 10 and the footing 12A and float in the air as shown in the EE arrow view. That is, the supporting carriage 53Aa on the traveling girder 50A supports the second jack part 4, and the supporting carriage 53Ab supports the third jack part 5, and the traveling girder 50 passes through these four jack parts in total. The entire load of the portal lifting / lowering means 1 is supported. Although the first jack portion 3 is not supported, the loading span 21 supported is heavier than the overhanging removal span 20 by moving the trolley 7 to the loading span 21 side. Even if the weight is balanced and the first jack portion 3 is in an overhang shape that floats from the first footing foundation 12A, it can be stably supported.

  At this time, if the weight balance cannot be achieved, a part of the structure removed in the previous step can be fixed to the trolley 7 to be used as a counterweight.

  Since it is configured as described above, the traveling girder 50 supports the support carriage 53 attached to the second jack portion 4 and the third jack portion 5 and moves in the bridge axis direction along the upper surface of the traveling girder 50. Thus, the portal lifting / lowering means 1 can be moved integrally in the direction of the bridge axis.

  When the portal lifting / lowering means 1 is moved, the load is supported by the footings 12B, 12C, and 12D from the traveling carriages 51Aa, 51Ab, and 51Ac of the traveling girder 50 through the lower construction walls 11B, 11C, and 11D. ing. Therefore, the portal lifting / lowering means 1 can be integrally span-fed without damaging the superstructure.

  In addition, if each of the traveling carriages is a carriage provided with four wheels, it is preferable that the traveling carriage is composed of traveling digits 50A and 50B divided on the left and right sides.

  FIG. 3 (b) shows a state in which the portal lifting / lowering means 1 has been moved by one span. After the span feeding is performed with each jack portion contracted, the first jack portion 3 is extended in the direction of the arrow 41 to Abuts on the second footing 12B, extends the lowermost portion of the second jack portion 4 in the direction of arrow 41 and contacts the upper work 10B, and extends the lowermost portion of the third jack portion 5 in the direction of arrow 41 and contacts the upper work 10B. . After all the jack parts of the six legs are supported by contact with the footing 12 or the upper work 10, all the support carriages 53 (53A, 53B) are removed from the respective jack parts.

  After that, the traveling girder 50 is integrally moved on the superstructure 10B, moved by one span, and the portal lifting / lowering means 1 is installed at a position where a new removal span 20A and a loading span 21A are formed.

  After installation at a new position, the upper work 10B and the lower work wall 11B of the new removal span 20A are sequentially removed.

  As described above, the bridge collective removal method according to the present invention can perform the removal work from the bridge to be removed, and does not require a large work space. In addition, since the superstructure is divided and the substructure is removed one by one in sequence, work on the bridge is limited not only for bridges over rivers, but also for land bridges. It can be used even when it cannot be used, and can also be applied to underpasses, under iron bridges, and in tunnels.

  A series of steps of the bridge removal work described above will be described with reference to the flowchart shown in FIG. First, the portal lifting / lowering means 1 is installed on the bridge to be removed in the preparation step S1 for installing the portal lifting / lowering means, and a removal span and a loading span are formed. Thereafter, an upper work cutting step S2 for cutting the upper work in the removal span into a size to remove, and an upper work transfer process S3 for sequentially raising the upper work in the removal span and transferring it to the unloading vehicle on the loading span. An upper work removing step comprising an upper work unloading step S4 for unloading the upper work from the loading span is performed. Then, a lower work separating step S5 for fixing the lower work wall from which the upper work has been removed to the trolley and separating it from the footing, and extending the jack of the portal lifting means 1 to the separated lower work wall. A substructure removal step S6 is performed, which includes a substructure transfer step S6 for transferring to the loading span, and a substructure unloading step S7 for loading and unloading the unloading vehicle on the surface of the superstructure of the loading span. . Thus, after the removal of the upper work and the lower work wall in the set removal span is completed, the portal lifting means for moving the portal lifting means one span to form a new removal span and a loading span. A new removal span and a new loading span are formed through the moving step S8.

  After that, proceed with the next new removal work from the superstructure cutting step S2 in the new removal span and repeat it sequentially, and then remove and remove the upper construction and lower construction wall of the predetermined number of spans in order. Complete.

  In addition to the substructure wall, when removing substructure footings and foundation piles, the first gate-type jack 3 has been described above as a structure that stands on the riverbed ground or support layer outside the first footing 12A. The steps shown in the flowchart may be sequentially executed, and as the substructure removal step, the bridge lump removal method that sequentially incorporates the footing removal step and the foundation pile removal step may be used. With this removal method, footing and foundation piles can be removed by work from the bridge, and even when riverbed excavation is necessary due to the need to increase the cross section of the flow, it is suitable. .

  According to the bridge lump removal method according to the present invention, the upper part in the removal span is provided via a six-legged portal lifting means that includes a jack part straddling the upper work and the lower work and forms a removal span and a loading span. Since the lifting / lowering means is integrally moved after the work is removed and loaded onto the loading span, it is possible to form a bridge collective removal method that can be divided and removed sequentially for each span.

  At this time, since all the load generated during the work process is supported by the substructure, the superstructure and the substructure constituting the bridge are sequentially removed without damaging the superstructure during the work. be able to.

  In addition, since the superstructure and substructure to be removed are removed with a predetermined size, there is no small dismantling process, and the influence on the surrounding environment can be minimized.

  That is, the bridge lump removal method according to the present invention can be a low-cost bridge lump removal method that does not adversely affect the surroundings and can be constructed in a short construction period.

  In addition, when removing bridges over rivers, etc., it is not necessary to install cranes in rivers, etc., and it is possible to remove superstructures and substructures sequentially from the top of the bridge. Construction will be possible, and it will be a bridge removal method that allows construction throughout the year.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic explanatory drawing which removes the superstructure using the six-legged gate type lifting means according to the present invention, (a) shows the place where the superstructure to be removed is lifted, and (b) lowers the superstructure. Shows where it will be placed on the unloading vehicle. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic explanatory drawing which removes a substructure using the six-legged gate type lifting means according to the present invention, (a) shows a place where the substructure to be removed is lifted, and (b) lowers the substructure. Shows where it will be placed on the unloading vehicle. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic explanatory drawing which moves the six-legged portal type raising / lowering means according to the present invention, (a) shows a place where the traveling girder according to the present invention is installed, and (b) moves the portal type lifting means by one span It shows where you did it. It is a flowchart which shows the flow of the bridge lump removal construction method which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gate type raising / lowering means 2A Vertical beam 2B Horizontal beam 3 First gate type jack 3A, 3B Jack part 4 Second gate type jack 5 Third gate type jack 6 Trolligarder 7 Trolley 9 Unloading vehicle 10 Upper construction 11 Lower construction wall 12 Substructure footing 20 Removal span 21 Loading span 50 Traveling girder 51 Traveling carriage 52 Bracket 53 Supporting carriage

Claims (8)

Equipped with a substructure wall installed on a substructure footing that is arranged in multiples for each predetermined span, and a superstructure placed on the substructure wall, removing bridges over rivers, etc. It is a collective bridge removal method that
A first gate-type jack that stands on the first footing across the upper work and the lower work wall, and a second gate-type jack that stands on the upper work located on the second second footing; In addition, it is equipped with a third gate-type jack that stands on the superstructure located on the next third footing, and is a six-legged portal-type lift that is constructed integrally through a vertical beam that connects the upper parts of each gate-type jack. A preparation step of installing means;
A span between the first gate-type jack and the second gate-type jack is a removal span, and a span between the second gate-type jack and the third gate-type jack is a span. The upper span of the removal span is divided into a plurality of parts in the bridge axis direction through a trolley that travels in the bridge axis direction along the trolley gard that is mounted and a moving means that traverses the trolley girder in a direction perpendicular to the bridge axis. The upper construction removal process of lifting up sequentially, transferring to the loading span and removing,
After the first lower construction wall from which the superstructure has been removed is cut from the footing with a wire saw or the like, the trolley raises the first lower construction wall and transfers it to the upper construction of the loading span. Substructure removal process to be removed,
The bridge-type lifting / lowering means comprises a portal-type lifting / lowering means moving step in which the portal-type lifting / lowering means moves integrally with a traveling girder movable in the bridge axis direction on the surface of the superstructure. Removal method. Equipped with a substructure wall installed on a substructure footing that is arranged in multiples for each predetermined span, and a superstructure placed on the substructure wall, removing bridges over rivers, etc. It is a collective bridge removal method that
A first gate jack that stands on the riverbed ground or support layer outside the first footing across the upper work and the lower work wall, and a first stand that stands on the upper work located on the next second footing. A double gate type jack and a third gate type jack standing on the superstructure located on the next third footing are further provided, and the six gates are integrally formed through vertical beams connecting the upper portions of the respective gate type jacks. A preparation process for installing the gate-type lifting means of the main leg;
A span between the first gate-type jack and the second gate-type jack is a removal span, and a span between the second gate-type jack and the third gate-type jack is a span. The upper span of the removal span is divided into a plurality of parts in the bridge axis direction through a trolley that travels in the bridge axis direction along the trolley gard that is mounted and a moving means that traverses the trolley girder in a direction perpendicular to the bridge axis. The upper construction removal process of lifting up sequentially, transferring to the loading span and removing,
After cutting the first lower construction wall from which the superstructure has been removed from the footing with a wire saw or the like, the trolley raises the first lower construction wall or the first lower construction wall and the Lifting the footing and the foundation pile in order, transferring to the upper work of the loading span, and removing the lower work,
The bridge-type lifting / lowering means comprises a portal-type lifting / lowering means moving step in which the portal-type lifting / lowering means moves integrally with a traveling girder movable in the bridge axis direction on the surface of the superstructure. Removal method.   The superstructure removal step is a superstructure cutting step of cutting the superstructure to a size to be removed, and the superstructure is fixed to the trolley, and the fixed superstructure is extended by the jack of the gate type lifting means An upper work transfer step for raising and transferring to the loading span, and an upper work unloading step for loading and unloading on an unloading vehicle waiting on the surface of the upper work of the loading span. Item 3. A method for removing a bridge in a lump.   The substructure removal step is a substructure separation step of fixing a substructure wall to the trolley and separating from the footing, and extending the jack of the portal type lifting means to lift the separated substructure, The substructure transfer process which transfers to the said loading span, and the substructure unloading process which loads and unloads to the unloading vehicle which waits on the surface of the superstructure of the said loading span is characterized by the above-mentioned. The bridge lump removal method described in any of the above.   2. The traveling girder includes three sets of traveling carriages, and the three sets of traveling carriages are provided at intervals corresponding to three consecutive substructures. 4. The method for removing a bridge as a whole according to any one of 4 above.   The gate-type lifting means moving step includes the three sets of traveling carts, a second substructure positioned below the second gate-type jack, and a third substructure positioned below the third gate-type jack; After moving to the upper work at a position corresponding to three places with the next fourth lower work, with the support carriage supporting the gate type lifting means, the six-legged jack is shrunk and the gate 6. The method of removing a bridge collectively according to claim 1, wherein the method is a step of collectively supporting the mold lifting means and moving on the traveling beam.   The bridge lump removal method according to claim 6, wherein the traveling girder is a split type in which the gate-type lifting means is provided separately on the left and right sides, and three sets of the traveling carriages are provided on each traveling girder.   The bridge removal method according to claim 7, wherein each of the traveling carriages is a carriage provided with four wheels.

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