JP2009052305A - Construction method for replacing bridge girder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method for replacing a bridge girder capable of safely, quickly, securely and inexpensively replacing the bridge girder in replacing a road bridge or a railroad bridge even in a, long, and narrow land in the direction of bridge axis by a longitudinal take-out method. <P>SOLUTION: In this construction method, a new bridge girder 3 assembled at a work yard is longitudinally moved in the direction of bridge axis by a self-propelling bogie 10 mounted with a hydraulic jack and a rail to carry it onto the existing bridge girder 2 and is supported by a temporary receiving saddle and a temporary receiving member 11 of the hydraulic jack, the existing bridge girder 2 is laterally moved by a lateral take-out rail and the self-propelling bogie for temporary evacuation into a side part of a new bridge girder construction position, and the new bridge girder 3 is lowered and constructed at the construction position. The existing bridge girder 2 is laterally moved by the lateral take-out rail and the self-propelling bogie, is arranged on the new bridge girder 3, is longitudinally moved in the direction of bridge axis on the new bridge girder 3 by the self-propelling bogie 10, and is removed and carried out into the work yard. Consequently, the construction work for replacing the bridge girder becomes possible even when the conditions exist such as preventing installation of a work structural base for lateral take-out to be installed in a side part of a newly installed bridge girder in a conventional construction method and the restriction of using a space below the bridge girder. <P>COPYRIGHT: (C)2009,JPO&INPIT

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, 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 retracted (temporarily retracted) to the side of the erection position by lateral movement with both ends supported by temporary support material, the new girder is lowered and erected at the erection position. This is a bridge girder replacement method characterized in that the frame is placed on the new girder by lateral movement (transverse movement including lifting operation) and the old girder on the new girder is carried out in the direction of the bridge axis by vertical movement. 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 vertically (using the old girder as temporary material), the old girder and the new girder are swapped, and the old girder on the new girder is removed vertically. (Use new girder as temporary material)

  A vertical carriage can use a self-propelled carriage with a rail and a hydraulic jack. For the horizontal capture, a horizontal rail supported by a temporary receiving sanddle or the like and a self-propelled carriage can be used. 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 intercepted. (See FIG. 1). The old girder can be seized simply by extending the side rails installed on the piers and abutments to the outside and slightly projecting outside, and it does not become a large and vast facility like a conventional work platform for pretending. .

  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, since the space under the new girder is removed after the old girder is cut off, the undergirder space is not used at all, so that safer, faster, more reliable and cheaper replacement can be performed.

  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.

  The invention of claim 3 of the present invention is the bridge girder replacement method according to claim 2, characterized in that the old girder carried out by vertical movement on the new girder is carried out onto the work gantry. It is a replacement method.

  In a narrow and narrow area in the direction of the bridge axis, such as a railway bridge, install a work platform that is elongated in the direction of the bridge axis on the side of the track (see Fig. 3). The sample is taken up and then placed on the old girder by vertical drawing. Further, the old girder that has been transported to the side of the work gantry by vertical cutting is taken on the work gantry, and the old girder is cut into blocks on the work gantry and carried out.

  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, and home girders can be replaced at the bridges of railways. it can. In the case of this home girder, it is possible to remove the old girder by taking the old home girder on the old girder before taking the new girder vertically on the old girder (see FIG. 3). ). After the installation of the new girder and removal of the old girder are completed, the new home girder can be placed on the new girder by vertical installation from the work gantry, etc., and then installed next to the new girder by horizontal installation (see Fig. 7). ).

  In addition, new construction of bridge piers and abutments can be performed. In this case, both ends of the old girder are supported by temporary materials such as temporary piles, the existing piers and abutments are removed, and new piers and abutments are constructed (see FIG. 2).

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

(1) Use the work conductors in the direction of the bridge axis to install the new girder temporarily on the old girder vertically, replace the old girder and the new girder, and remove the old girder on the new girder vertically. Both temporary construction materials can be used for safe, quick, reliable, and inexpensive replacement work. 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) After the old girder has been taken, the new girder is removed and the space under the girder is not used at all, so it is possible to perform safer, faster, more reliable and cheaper replacement work.

(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 laterally moved by a predetermined distance in the horizontal direction (perpendicular to the bridge axis) by the side rails installed on the pier 1 and the self-propelled carriage, and the new girder 2 is moved to the side retracted position. Retreat in parallel with the girder 3. Next, the support end portions 3a at both ends are removed, and the new girder 3 is lowered by a temporary receiving sanddle and a hydraulic jack and installed at the installation position. Both ends of the new girder 3 are supported on the pier 1 by bearings.

  The old girder 2 located on the side of the new girder 3 is raised to a predetermined height by a sanddle or the like, and is moved on the new girder 3 by a horizontal rail and a self-propelled carriage. The old girder 2 is placed on the new girder 3 via the self-propelled carriage 10, moved vertically on the new girder 3 in the direction of the bridge axis, and carried out to the work yard, and the replacement of the new and old girder 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 temporary pile 20 is removed after the old girder 2 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. 1 (c)).

(3) As shown in FIG. 5, the old girder 2-1 under the new girder 3-1 is separated from the adjacent old girder 2-2, and is moved sideways by a side rail and a self-propelled carriage to be retracted to the side. . The new girder 3-1 is lowered with a temporary receiving sanddle and a hydraulic jack, and both ends in the direction of the bridge axis are supported on the pier by support. A new home girder 5-1 is assembled on the work platform 30-1.

(4) As shown in FIG. 6, the old girder 2-1 is raised to a predetermined height with a sandal or the like, and is moved laterally onto the new girder 3-1 by a pre-rail and a self-propelled carriage. The old girder 2-1 on the new girder 3-1 is vertically moved to the work gantry side by the rail of the track and the self-propelled carriage, and is laterally moved to the work gantry 30-2 by the pre-preparation rail and the self-propelled carriage. The old girder 2-1 is cut into blocks on the work gantry 30-2 and carried out.

(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 process of removal and new installation of a pier. 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 a specific example of the replacement construction method of this invention, and is the top view and sectional drawing which show the process of carrying out 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 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 3 ... New girder 3a ... Support end 4 ... Old home girder 5 ... New home girder 6 ... New pier 10 ... Self-propelled carriage 11 ... Temporary receiving material 20 ... Temporary receiving pile 30 ... Working gantry

Claims (3)

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 direction of the bridge axis, and the new girder is retracted to the side of the installation position by lateral movement while both ends of the new girder are supported by the temporary support material. A bridge girder replacement method characterized in that the girder is lowered and installed at the installation position, the old girder is placed on the new girder by lateral movement, and the old girder on the new girder is carried out in the direction of the bridge axis by vertical movement. .   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.   The bridge girder replacement method according to claim 2, wherein the old girder carried out by vertical movement on the new girder is carried out onto a work gantry.

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