JP4956332B2 - Bridge girder replacement method - Google Patents

Description

  The present invention relates to a bridge girder replacement method in which a new girder is constructed by removing an old girder in a bridge such as a road bridge and a railway bridge.

  In road bridges, railway bridges, etc., existing bridges that have become old are replaced with new bridges, and various construction methods have been proposed. For example, in Patent Document 1, a new girder placed under an old girder between two piers is jacked up with a large jack so that the old girder is pushed up and separated from the two piers, and the old girder is removed. Later, a construction method to construct a new girder between two piers has been proposed.

  In addition, a so-called pre-construction method has been proposed as a method for shortening the period of suspension of train and vehicle operations and reducing the complexity of work. For example, in Patent Document 2, an old girder is left in a state of being supported by a temporary bridge pier, and only the pier part is newly constructed first, and along a horizontal guide device extending in a direction perpendicular to the bridge axis. A method has been proposed in which an old girder is moved laterally and removed, and a new girder previously constructed in another place is moved laterally and installed.

  FIG. 8 shows an example of a conventional pre-construction method, which is applied to a bridge part A of a railway constructed on a public road. The work gantry 50 is installed on the public road on both sides of the bridge part A, and the old girder is removed and the new girder is installed. The work gantry 50 is supported by a number of support piles 51.

  However, when installing a work platform for horizontal installation on such a public road over a wide area, there are buried objects such as water mains, etc. There is a problem that the gantry member is limited.

  A vertical construction method can be considered as a solution to such a problem. For example, in Patent Document 3, a new bridge component unloaded on and near the old bridge is temporarily moved by moving it to the erection position for the whole or every block, and a temporary material for forming a scaffolding or the like is formed below the old bridge. Attached, surrounded the new bridge, old bridge, and temporary material with chains in many places, supported the old bridge with the new bridge, cut the old bridge into blocks and carried it out, then lowered the new bridge to the installation position Proposed construction methods have been proposed.

JP 2004-332222 A JP 2006-193978 A Japanese Patent No. 3655161

  As described above, in the conventional side construction method, there is a problem that the place for placing the support pile of the work gantry is limited and the gantry member is increased. In the case of the vertical cutting method of the prior art, the old girder and the new girder are used as temporary materials, which is effective when there are restrictions such as under-girder space usage restrictions, but it is safer and faster. There is a need for a more reliable and cheaper vertical method. Furthermore, it is desired that the vertical construction method can be applied even in a narrow and narrow area in the direction of the bridge axis like a bridge part of a railway.

  The present invention has been made to solve the above-described problems, and in the replacement of bridges such as road bridges and railway bridges, the bridge replacement work can be performed safely, quickly, reliably, and inexpensively by the vertical construction method. In addition, the present invention provides a bridge girder replacement method that can be performed safely, quickly, reliably, and inexpensively in narrow narrow areas extending in the direction of the bridge axis.

  The invention of claim 1 of the present invention is a bridge girder replacement method in which the old girder of the bridge is removed and a new girder is installed, and the new girder is temporarily installed on the old girder by longitudinal movement in the direction of the bridge axis. After the old girder is suspended and removed by the above-mentioned lifting device, with both ends supported by the temporary support material and the old girder suspended from the new girder by the hanging device installed in the new girder. It is a bridge girder replacement method characterized by lowering the new girder and erection at the erection position. The longitudinal movement is so-called longitudinal feeding in which longitudinal feeding is performed along the bridge axis direction, and the lateral movement is so-called lateral feeding in which lateral feeding is performed by parallel movement in the direction perpendicular to the bridge axis.

  The present invention is applied to road bridges, railway bridges, and the like, and is particularly effective for bridge girder replacement work where conditions such as conventional installation work platforms cannot be installed and under-girder space use restrictions are imposed. As shown in Fig. 1, the new girder is temporarily placed on the old girder by vertical cutting (the old girder is used as a temporary material), and the old girder is removed and removed from the new girder (the new girder is temporary material). ), Lower the new girder and set it to the specified installation position.

  A vertical carriage can use a self-propelled carriage with a rail and a hydraulic jack. In addition, the side rail which is supported by a temporary receiving sanddle or the like and a self-propelled cart can be used for the side rail described later. Support ends are added to both ends of the new girder, and the support end is supported by a self-propelled carriage with a hydraulic jack or a temporary receiving material (such as a temporary receiving sanddle and a hydraulic jack) so that the old girder can be lowered and removed. (See FIGS. 1 and 2). For the suspension device, a hydraulic jack and a suspension rod can be used. Both ends of the old girder pier or abutment are cut and removed prior to the descent, and the old girder is divided into a plurality of blocks along the direction of the bridge axis, and the descent is removed for each block (Fig. 1, Fig. 1). 2).

  In the present invention, work work in the direction of the bridge axis is utilized, and the new and old girders are mutually used as temporary materials, so that safe, quick, reliable, and inexpensive replacement work can be performed. In particular, it can be applied very effectively to bridge girder replacement work where conditions such as the conventional work platform for horizontal installation cannot be installed and under-girder space usage restrictions are imposed. In addition, the old girder takes the reaction force against the new girder and lowers and removes it, making it possible to perform safer, quicker, more reliable and cheaper replacement.

  According to claim 2 of the present invention, in the bridge girder replacement method according to claim 1, a work gantry is provided along the bridge axis direction, and a new girder assembled on the work gantry is moved vertically in the bridge axis direction. It is a bridge girder replacement method characterized in that it is carried onto the old girder by movement.

  In narrow and narrow areas such as railway bridges, a work base that is elongated in the direction of the bridge axis is installed on the side of the railway, etc., a new girder is assembled on this work base, and the work is taken on the railway, etc. Next, it is arranged on the old girder by vertical cutting. Further, as will be described later, the old home girder that has been transported to the side of the work gantry by vertical cutting is taken on the work gantry, and the old home girder is cut into blocks on the work gantry and carried out.

  According to claim 3 of the present invention, in the bridge girder replacement method according to claim 1 or 2, prior to the bridge girder replacement, both ends of the old girder are supported by temporary support members. It is a bridge girder replacement method characterized by removing an existing pier or abutment and constructing a new pier or abutment.

  This is the case where new construction of piers and abutments is also performed. Temporary support members, such as temporary piles, are used. After the construction of the piers, etc., the new girder and the old girder are connected by a lifting device, then the temporary support member is removed and the old girder is lowered and removed (see Fig. 2). ).

  The invention of claim 4 of the present invention is the bridge girder replacement method according to any one of claims 1 to 3, wherein an old home girder is installed next to the old girder, Prior to the vertical movement to the old girder, the old home girder is placed on the old girder by moving horizontally, the old home girder on the old girder is moved in the direction of the bridge axis by vertical movement, the old girder is removed, and the new girder This is a bridge girder replacement method characterized in that after the erection of the bridge girder is completed, the new home girder is placed on the new girder by vertical movement and is laid to the side of the new girder by lateral movement.

  The present invention can be applied to the replacement of old girders such as steel and concrete and new girders such as steel and concrete, but it is also possible to replace home girders at the bridges of railways. it can. Prior to the vertical placement of the new girder on the old girder, the old home girder is taken on the old girder and then removed to the work base or the like (see FIG. 3). After the installation of the new girder and removal of the old girder is completed, the new home girder is placed on the new girder by vertical installation from the work gantry, etc., and then installed next to the new girder by horizontal acquisition (see FIG. 7).

  Since the present invention is configured as described above, the following effects can be obtained.

(1) The new girder is temporarily installed on the old girder by vertical cutting, and the old girder is removed from the new girder by using the reaction force. Safe, quick, reliable, and inexpensive replacement work is possible. In particular, it can be applied very effectively to bridge girder replacement work where conditions such as the conventional work platform for horizontal installation cannot be installed and under-girder space usage restrictions are imposed.

(2) Since the old girder is removed from the new girder and removed, further safer, quicker, more reliable and cheaper replacement work is possible.

(3) Since the work gantry can be installed along the direction of the bridge axis, safe, quick, reliable, and inexpensive replacement work can be performed even in narrow and narrow areas.

  Hereinafter, the present invention will be described based on the illustrated embodiments. FIG. 1 shows the basic configuration of the replacement method of the present invention in the order of steps. 2 to 7 show specific examples in the order of steps.

  As shown in FIG. 1, an old girder 2 is installed between piers (or abutments) 1 and 1, and a new girder 3 is assembled at a work yard separated from the old girder 2 by a predetermined distance in the bridge axis direction. Support ends 3a are connected to both ends of the new girder 3, and the support end 3a is supported by a self-propelled carriage 10 equipped with a hydraulic jack capable of self-propelling on a rail or the like. It is moved vertically in the direction of the bridge axis and carried onto the old girder 2, and the new girder 3 is temporarily installed on the old girder 2 in parallel with the old girder 2.

  Support end portions 3a at both ends of the new beam 3 positioned above the old beam 2 are supported by a temporary receiving material 11 including a temporary receiving sanddle and a hydraulic jack. In this state, the old girder 2 is suspended and supported by a plurality of hanging devices 12 arranged at predetermined intervals in the bridge axis direction of the new girder 3. For the suspension device 12, for example, a hydraulic jack 13 such as a center hole jack and a suspension rod 14 are used. A pair of hydraulic jacks 13 are arranged on the upper surface of the new girder 3 in the direction perpendicular to the bridge axis, the lower part of the suspension rod 14 is connected to the old beam 2, and the suspension rod 14 is lowered by the hydraulic jack 13.

  Before the old girder 2 is suspended, the ends 2a and 2a of the old girder 2 are cut and removed from the pier 1. In the case of the illustrated example, the old girder 2 is divided into two along the bridge axis direction, and the old girder 2 on one side is hung on a transport carriage (unit carrier) 16 by a hanging device 12 and is carried out. The remaining old girder 2 is lowered and removed in the same manner.

  Next, the support end portions 3a at both ends of the new girder 3 are removed, and the new girder 3 is lowered by a temporary receiving sander and a hydraulic jack and is installed at the installation position. Both ends of the new girder 3 are supported on the pier 1 by bearings. Thereby, the replacement of the old and new digits is completed.

  The specific example of FIGS. 2-7 is a case where it applies to the bridge part of the railway constructed on the public road. In addition, the bridge girder and the platform girder at the elevated station are replaced.

  Furthermore, as shown in FIG. 2, when the existing piers and the like are also renewed, both ends of the old girder 2 are supported by the temporary support piles 20, the existing piers 1 and the like are removed, and the new piers 6 and the like are constructed. The new girder 3 and the old girder 2 are connected by a hanging device 12, both end portions 2 a of the old girder 2 are cut and removed from the pier 1, and both end portions of the new girder 2 are temporarily received on the pier 1 It is supported by a temporary receiving material 11 made of a hydraulic jack. Then, the temporary pile 20 is removed.

  As shown in FIG. 3, the bridge part A on the public road is an end of the elevated station, and the old girders 2-1 and 2-2 and the old home girders 4-1 and 4-2 are installed. Working gantry 30-1 and 30-2 for vertical installation are installed in parallel with the track on the side of the track in the site adjacent to the old girder 2 in the bridge axis direction. The work gantry 30 is provided with a portal crane 31 for assembling new girders, cutting old girders, and the like.

  Replacement of old and new digits is performed in the following procedure. In addition, the replacement is performed one side by closing only one line. In the example of illustration, the track 1 side is constructed first. Moreover, since the public road is inclined with respect to the track, the pre-emption is performed by translating obliquely along the public road.

(1) As shown in FIG. 3, the new girder 3-1 is assembled on the work gantry 30-1 on the track 1 side. In parallel with this, the old home girder 4-1 is raised to a predetermined height with a sanddle or the like, and is laterally moved onto the old girder 2-1 by the preparatory rail and the self-propelled carriage. The old home girder 4-1 on the old girder 2-1 is moved vertically to the work gantry side by the rail of the track and the self-propelled carriage, and the vacant work gantry 30-2 on the side of the track 2 is moved by the pre-preparation rail and the self-propelled dolly. Move sideways. The old home beam 4-1 is cut into blocks on the work gantry 30-2 and carried out.

(2) As shown in FIG. 4, the new girder 3-1 assembled on the work gantry 30-1 is moved laterally on the rail of the track by the pre-preparation rail and the self-propelled cart, and the rail of the rail and the self-propelled cart 10 It is moved vertically and carried onto the old girder 2-1, and is temporarily installed by supporting both ends with a temporary receiving sanddle and a hydraulic jack (see FIG. 2 (c)).

(3) As shown in FIG. 5, the old girder 2-1 is suspended and supported by the hanging device 12 installed on the new girder 3-1. On the new girder 3-1, a support frame 15 is installed along the direction perpendicular to the bridge axis, and a hydraulic jack 13 is installed thereon. The suspension rod 14 is connected to the old beam 2-1 through the new beam 3-1. The old girder 2-1 is suspended by the suspension device 12 and removed. A new home girder 5-1 is assembled on the work platform 30-1.

(4) As shown in FIG. 6, the new girder 3-1 is lowered by the temporary support material 11 (temporary reception sanddle and hydraulic jack) on the pier supporting the both ends of the new girder 3-1 and supported by the support on the pier. This completes the replacement of the old and new digits.

(5) As shown in FIG. 7, the new home girder 5-1 assembled on the work gantry 30-1 is moved laterally on the rail of the track by the pre-preparation rail and the self-propelled cart. Is moved vertically and placed on the new digit 3-1. The new home girder 5-1 on the new girder 3-1 is moved laterally to the side of the new girder 3-1 by the pre-rail and the self-propelled carriage, and is lowered and installed along the new girder 3-1.

  The replacement on one side is completed as described above, and the replacement on the opposite side is performed in the same manner.

  In addition, although the example applied to the bridge part of a railway bridge was shown above, it cannot be overemphasized that this invention is applicable not only to this but replacement of a road bridge and other bridge girders.

It is the side view and sectional drawing which show the basic composition of the replacement construction method of this invention in order of a process. It is a specific example of the replacement construction method of this invention, and is a side view which shows the case where removal and new installation of a pier are accompanied. It is a specific example of the replacement construction method of this invention, and is the top view and sectional drawing which show the process of removal of an old home girder. It is a specific example of the replacement construction method of this invention, and is the top view and sectional drawing which show the process of the vertical feed of a new girder. It is a specific example of the replacement construction method of this invention, and is the top view and sectional drawing which show the process of removal of an old girder. It is the specific example of the replacement construction method of this invention, and is the top view and sectional drawing which show the process of erection of a new girder. It is the specific example of the replacement construction method of this invention, and is the top view and sectional drawing which show the process of the vertical feed of a new home girder. It is a top view which shows an example of the conventional horizontal construction method.

Explanation of symbols

1 …… Bridge pier (Abutment)
2 ... Old girder 2a ... End 3 ... New girder 3a ... Support end 4 ... Old home girder 5 ... New home girder 6 ... New bridge pier 10 ... Self-propelled carriage 11 ... Temporary receiving material 12 ... Hanging Unloading device 13 ... Hydraulic jack 14 ... Hanging rod 15 ... Supporting stand 16 ... Transport cart 20 ... Temporary pile 30 ... Working platform

Claims (4)

It is a bridge girder replacement method in which the old girder of the bridge is removed and a new girder is installed,
The new girder is temporarily installed on the old girder by longitudinal movement in the bridge axis direction, both ends of the new girder are supported by temporary receiving materials, and the old girder is suspended from the new girder by the suspension device installed in the new girder. A bridge girder replacement method, wherein the old girder is suspended and removed by the hanging device in a supported state, and then the new girder is lowered and installed at the installation position.   In the bridge girder replacement method according to claim 1, a work gantry is provided along the bridge axis direction, and a new girder assembled on the work gantry is carried onto the old girder by longitudinal movement in the bridge axis direction. The bridge girder replacement method is a feature.   In the bridge girder replacement method according to claim 1 or 2, prior to the bridge girder replacement, the existing piers or abutments are removed with both ends of the old girder supported by temporary support members. The construction method of the bridge girder characterized by constructing a new pier or abutment.   In the bridge girder replacement method according to any one of claims 1 to 3, an old home girder is installed next to the old girder, and prior to the vertical movement of the new girder onto the old girder The old home girder is placed on the old girder by lateral movement, and the old home girder on the old girder is carried out in the direction of the bridge axis by vertical movement. After the removal of the old girder and the construction of the new girder are completed, the new home girder is completed. The bridge girder replacement method is characterized in that the bridge is placed on the new girder by vertical movement and laid on the side of the new girder by horizontal movement.

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