JP5671373B2 - Bridge removal method and new construction method - Google Patents

Description

  The present invention relates to a method for removing an existing bridge, which is a bridge having a structure that can be supported on an upper part such as a truss bridge, and a new method for constructing a bridge. More specifically, a mobile crane, a large crane, a cable crane, etc. are not used as much as possible. The present invention relates to a bridge removal method and a new construction method in which existing bridges can be removed or newly constructed by work on the upper surface from the top of the abutment and pier without using the space on the lower surface of the bridge.

  Conventional dismantling methods for dismantling and removing existing bridges include (1) a method of breaking existing bridges with a crane, (2) a method of removing existing bridges with a large crane, and (3) a cable crane The method of removal is used.

  The method of (1) small-spreading with a crane is to support the bridge with a support called a vent, or build a steel tower on the abutment or pier, suspend the bridge with a wire from its tip, and remove it with a mobile crane However, since it is a condition that a mobile crane can be installed close to the side of the bridge, it is necessary to install a pier if it is in a crane yard or in a river. There's a problem.

  The method of removing the existing bridge with the large crane in (2) is to install a large crane in the vicinity of the existing bridge and block about 1 span of the existing bridge with a continuous girder or simple girder suspended on this crane. However, the construction and dismantling yard of a large crane crane is required, and it is not possible depending on the work capacity of the crane in the case of a bridge over a large river. There is a problem.

  (3) The method of removing with a cable crane is used at sites where vents are not built or sites where large cranes cannot be installed. It is a method of hanging suspension bridges and making them small with a cable crane, but it requires assembly and disassembly work of the cable crane, which requires time and effort and is not suitable for bridges over large rivers. .

  In addition to the conventional general removal method, a bridge removal method in which a plurality of truss bridges are connected in the longitudinal direction has been proposed.

  In this removal method, a support structure is arranged over the entire length of the truss bridge to be removed and the adjacent truss bridge, and this support structure is supported by the pier and dismantled at one end of the truss bridge to be removed. This is carried out by providing a large truck for arranging necessary equipment and heavy machinery, and installing a cable crane over the entire length of the bridge (for example, see Patent Document 1).

  The support structure uses a rectangular panel body, and is connected in the thickness direction or connected in the length direction so that the length and thickness can be changed or the height can be set to a desired height. In addition, the above-mentioned cable crane has a portal tower standing on the piers at both ends in the entire length of the bridge, the cable is stretched between the portal towers, and hooks for hanging the cable are provided. It has a structure in which the carrier is movably attached.

  To remove the truss bridge from the truss bridge to be demolished, install a support structure between the truss bridge to be dismantled and the adjacent truss bridge and support it with the pier. The main structure is disassembled and transported to one end of the bridge with a cable crane. After that, the bridge girder is cut and supported at the bottom of the support structure, and both ends of the bridge girder are cut. The bridge girder can be separated from the bridge, and the supported bridge girder can be removed by transporting it to one end of the bridge suspended by a cable crane. By repeating the above steps for each truss bridge, the bridge can be removed. It will be removed.

  This type of removal method is effective at sites where there are no crane installation yards on the bridge over the river or on the side of the bridge, and work from the top of the abutment and pier to the top without using the space on the bottom of the bridge. The existing bridge can be removed at the site, and there is an advantage in that it can be constructed in the flood season because it is not subject to restrictions even in the site where it is restricted in the period of drought period construction in the river.

JP 2006-214113 A

  However, in the above-mentioned removal method, the support structure to be installed over the truss bridge to be dismantled and the adjacent truss bridge is installed with a cable crane. It is a difficult task to move the support structure to the target position of the bridge with a cable crane, and it is difficult to do the actual work.

  In addition, the main structure of the truss bridge to be dismantled is dismantled at the original position of the truss bridge, and this is transported to one end of the bridge with a cable crane. The work efficiency deteriorates as the number of times increases.

  In addition, a large cable crane is required to suspend and transport disassembled members and cut bridge girders. Assembling and disassembling such a large cable crane takes time and effort, and the equipment cost is high. Therefore, there is a problem that it is not suitable for a bridge over a large river.

  Therefore, the object of the present invention is to remove the existing bridge that can be supported by the upper part of the main structure, and to move the bridge divided to a predetermined length to the land side along the construction girder, thereby limiting the structure of the bridge. The bridge that has been divided without receiving it can be moved to the land side easily and reliably, and by disassembling at this position on the land side, the efficiency of the dismantling work can be improved, and the mobile crane, large crane, cable crane The purpose is to provide a bridge removal method that can reduce the equipment cost and work cost, and a new bridge construction method using the equipment used to implement this removal method.

  In order to solve the problems as described above, the invention of the removal method according to claim 1 is that the existing bridge that can be supported at the upper part is in a state where one end is made small, and from one end to a predetermined length position. This is a method of removing a bridge that is disassembled by dividing it into a split existing bridge and moving the split existing bridge to a position where it has been moved to one end, and paving plates and floors against the bridge surface of the existing bridge. Prior work to remove the plate and leave the bridge girder only, the cross girder processing process to replace and remove each girder of the bridge surface that became only the bridge girder, and the gantry installation process to install the girder gantry on the pier After the installation stage, the construction girder is sent from one end to the inside of the existing bridge, and the construction girder is supported by the construction girder, so that the total length of the existing bridge can be met. Construction girder installation process to insert the construction girder of With the carriage that can run in the length direction of this construction girder installed on the construction girder, the main structure and the bridge surface of the existing bridge are divided at a predetermined distance from the end to make a divided existing bridge. The dividing process of supporting the existing bridge with the carriage, and the divided existing bridge supported by the carriage is moved to the temporary placement position set at one end of the construction girder by moving the carriage, and the existing bridge is divided at this temporary placement position. Then, the entire length of the existing bridge is removed by repeating the dividing and unloading steps for the length of the existing bridge. It was intended to be removed.

  The invention of the removal method of claim 2 is a state in which the existing bridge that can be supported at the upper part is divided into both predetermined length positions from both ends in a state where both ends are divided, This is a method of removing a bridge that is dismantled by moving the existing existing bridge to a position where both ends of the existing bridge are moved, and removing the pavement and floor slabs from the bridge surface of the existing bridge. From the both ends of the existing bridge, the preparatory work to be put in place, the cross-girder processing process to replace and remove each cross-girder of the bridge surface that became only the bridge girder, the gantry installation process to install the girder gantry on the pier, By sending the construction girders inward while supporting them, and supporting the construction girders with the construction girders, and connecting the ends of both construction girders to each other, a construction girder with a length corresponding to the entire length of the existing bridge can be obtained. Installation girder installation process to be inserted and on the construction girder With multiple trolleys that can run in the construction girder's length direction, the main structure of the existing bridge and the bridge surface are divided at a predetermined distance from both ends to be divided into existing bridges. The dividing process for supporting the bridge with a carriage, and the existing bridges that are supported by each carriage are moved to the temporary positions set at both ends of the work girder by moving the carriage, respectively, and the existing divided bridges are separated at the temporary positions. The loading and unloading process is carried out on the ground side, and the entire length of the existing bridge is removed by repeating the above-mentioned dividing process and unloading process for the length from both ends of the existing bridge. The stand was removed.

  The invention of the removal method according to claim 3 is that the part of the existing bridge where each cross girder of the bridge girder is exchanged is interfered with the work girder base when the divided existing bridge is moved to the temporary setting position of the work girder by the carriage. It has a structure in which the remaining parts of the divided cross beams are joined with a detachable connecting material, and the parts where each cross beam is exchanged are connected when passing through the work girder mount This is a sort of reordering.

  According to the invention of the removal method of claim 4, a leg-surrounding scaffold is installed on the bridge pier, and the re-placement work of each cross beam is performed on the scaffold.

  The invention of the removal method of claim 5 is that the carriage installed on the construction girder is composed of a self-propelled carriage that runs along a rail provided on the upper surface of the construction girder and a follower carriage that is connected to the carriage. The main structure is moved to a temporary position set at the end of the construction girder while a plurality of locations are supported by a self-propelled carriage and a follower carriage.

  Here, the existing bridge to be removed is composed of a bridge surface supported by an abutment and a pier, and a main structure provided from both sides of the bridge surface to the upper surface, and the bridge surface has a constant interval in the width direction. On the bridge girder formed by a large number of main girders along the entire length in the length direction and a large number of horizontal girder long in the width direction where the main girder is arranged at regular intervals in the length direction, It has a structure provided with floor slab concrete, and the main structure is assembled in a truss shape using various steel materials.

  The work girder mounts on the piers are erected in such a way that a plurality of vent pillars are placed between the main girders on the bridge surface along the width direction of the existing bridge, and each support base that is long in the width direction of the existing bridge is vented. The structure is supported by the upper end of the pillar, and a leg-surrounding scaffolding consisting of a scaffolding board and a handrail is installed around the upper part of this pier.

  The above construction girders are designed to obtain the required length by sequentially adding the cross sections with the required length, and the self-propelled carriage and the follower carriage move along the length direction on the upper surface. By installing a construction girder on the end land of the existing bridge with the initial length, sending this construction girder into the existing bridge and adding it to the existing bridge, The construction girder is arranged so as to penetrate the entire length of the inside, and for this reason, on the end of the existing bridge, a feeding facility for sending the construction girder into the existing bridge is installed in advance.

  The floor structure of the existing bridge is for construction girders when the pavement slab and floor slab are removed, and then each transverse girder is removed and replaced with a replacement structure. The realignment structure maintains the strength when moving the existing divided pier to the temporary position and ensures the safety of work when moving to the temporary position. is there.

  This horizontal girder rearrangement structure forms a square hole with the upper and lower parts left at the position where the horizontal girder interferes with the work girder mount, and a horizontal connecting material is passed over the square hole part. Both ends of the cross hole are bolted to the cross beam at both sides of the square hole, and then the part left above and below the square hole of the cross beam is removed, so that the divided part of the cross beam is connected with the connecting material. The connecting member is attached and detached with bolts when the cross beam passes through the construction beam stand.

  The self-propelled carriage is driven by a motor, and the self-propelled carriage and the follower carriage are connected via a connecting shaft so as to maintain a predetermined distance, and the length of the construction girder along the rail provided on the upper surface of the construction girder. It is possible to move in the direction and supports the upper part of the main structure of the existing divided bridge, and this divided existing bridge will be transferred to the temporary position set at the end of the construction girder and moved to the temporary position Divided existing bridges are loaded on a transport vehicle waiting on the ground side after the main structure is made small.

  Further, the invention behind the new construction of claim 6 assembles a short bridge in a state where a bridge that can be supported at the upper part is divided from one end portion by a predetermined length, and forwards the bridge toward the other end portion. This is a new construction method of a bridge that assembles the bridge by connecting them, and the installation procedure for installing the construction girder on the pier located between the abutments on both sides, and the construction girder from one abutment side after the installation procedure The construction girder installation process for inserting the construction girder of a length corresponding to this total length over the entire length between the abutments on both sides by supporting the construction girder with the construction girder base, Assembling process of assembling a partial bridge in a state where it is divided into predetermined lengths at one end of the construction girder with a dolly that can travel in the length direction of this construction girder, and supporting this partial bridge with a dolly And supported by the bogie The partial bridge is moved toward the other end of the construction girder by moving the carriage, and is installed between the abutment and the pier and between the piers. It is repeated until it becomes a bridge, and the total length of the bridge is assembled by connecting each partial bridge, and then the work girder and the work girder stand are removed.

  According to the removal method of the present invention, the construction girder is supported by a construction girder mount provided on the pier, and is inserted through the entire length of the existing bridge, and is divided at a predetermined distance from the end portion to divide the existing bridge. It is supported by the upper carriage, and this divided existing bridge is supported by the carriage and moved to the temporary placement position set at the ground side end of the construction girder, and the divided existing bridge is separated to the ground side at the temporary placement position. Loading and unloading, and repeating this for the length of the existing bridge, the entire length of the existing bridge was removed, and then the work girder and work girder base were removed, so mobile cranes, large cranes, cables Existing bridges with a structure that can be supported by the upper part of the main structure can be efficiently removed without using a crane or the like as much as possible.

  In addition, the construction girder is inserted through the entire length of the existing bridge, and the divided bridge is supported by the carriage arranged on the construction girder and transferred to the temporary placement position, and the divided existing bridge is separated at the temporary placement position. Therefore, all of the work required to remove the existing bridge can be performed from the end side of the existing bridge, which is effective in a site where there is no crane installation yard on the bridge over the river or on the side of the bridge.

  Furthermore, the existing bridge can be removed from the end side of the existing bridge, so that the existing bridge can be removed from the top of the abutment and pier without using the space on the lower surface of the bridge. Even at sites that are subject to restrictions on drought season construction, construction in the flood season is possible because there are no restrictions.

  Also, according to the new construction method of the present invention, the partial bridge assembled sequentially on one end side of the construction girder is moved to the other end side, and the partial bridge is constructed between the abutment and the pier or between the piers and the partial bridge is connected. Since the bridge is assembled, it is possible to construct a new bridge efficiently without using mobile cranes, large cranes, cable cranes, etc. as much as possible, and without using the space on the bottom of the bridge, Since the bridge can be assembled by work from the end to the upper surface, even in the field where the period of drought period construction is restricted in the river, construction in the flood season is possible because there is no restriction.

(A) is a longitudinal front view showing an example of an existing bridge to be removed by the first removal method of the present invention, (b) is an enlarged longitudinal front view showing a state where construction girders are being added on a work carriage Figure (A) is the front view which shows the state in the middle of the removal which expanded a part of said existing bridge, (b) is the vertical side view which expanded the existing bridge Front view showing a state in the middle of removal, further expanding a part of the existing bridge Longitudinal side view of the self-propelled trolley part showing a state in which the existing bridge is further enlarged and partly removed Cross-sectional plan view taken along arrows v-v in FIG. Longitudinal side view of the follower trolley showing a state where the existing bridge is further enlarged and partly removed The processing steps of the refill structure applied to the cross beam in the bridge girder of the existing bridge are shown, (a) is an enlarged vertical sectional view in a state where a square hole is provided in the cross beam, and (b) is a portion provided with the square hole. Enlarged longitudinal sectional view of the state where the connecting material is installed, (c) is an enlarged longitudinal sectional view of the state in which the upper and lower sides of the square hole in the cross beam are cut off and the divided cross beams are joined by the connecting material. The construction process of the removal method of this invention is shown, (a) is a longitudinal front view of an existing bridge to be removed, (b) is a longitudinal front view of a state in which a paving slab or floor slab of an existing bridge is being carried out (A) Longitudinal front view with lifting equipment installed on one end of the existing bridge to be removed, (b) Short leg on one end of the existing bridge, with a footrest and construction girder installed on the pier Longitudinal front view with a construction girder arranged, (c) Longitudinal front view with a short construction girder combined into an initial length construction girder (A) is a longitudinal front view showing the initial state of sending the construction girder toward the existing bridge, and (b) and (c) are longitudinal front views showing the state in the middle of sending the construction girder toward the existing bridge. (A) is a longitudinal front view showing the state of the final stage of sending the construction girder toward the existing bridge, (b) is a longitudinal front view showing a state in which the construction girder is penetrated toward the existing bridge, and (c) is a construction girder. Longitudinal front view showing a state where a carriage is installed on one end of (A) is a longitudinal front view with one end of the existing bridge being shrunk, (b) is where the existing bridge is divided at the first pier, and the cutting machine bridge is set at one end of the construction girder Fig. 2 (c) is a longitudinal front view of the temporary bridge position, and the existing bridge is divided at the second pier, and the dividing machine bridge is set at one end of the construction girder. Longitudinal front view of moving to a temporary placement position (A) is a longitudinal front view of a state in which the existing bridge is divided at the third pier part, the dividing machine bridge is moved to the temporary placement position set at one end of the construction girder, and this is broken down. b) Moves the existing bridge to the temporary setting position where the last cutting machine set bridge is set at one end of the construction girder, and disassembles it. (c) Removes the existing bridge. Vertical view of the state (A) Longitudinal front view showing the state where the construction girder is pulled back and removed, (b) Longitudinal front view showing the state where the construction girder has been removed, (c) Longitudinal section showing the completed construction of the existing bridge removal work Front view The second removal method of the present invention is shown, the existing bridge is divided from both ends and divided, and the dividing machine bridge is moved to the temporary placement position set at both ends of the construction girder, and the state is made small. (B) is a longitudinal front view in which one end of the above is enlarged. The construction process of the new construction method concerning this invention is shown, (a) is a longitudinal front view showing the state of a river provided with an abutment and a pier, and (b) is a longitudinal front view in which lifting equipment is installed on one side land of the river. , (C) is a longitudinal front view showing the state where the construction girder is being sent onto the pier (A) is a longitudinal front view showing a state in which a carriage is installed on a construction girder over a river, and (b) is a longitudinal front view showing a state in which the first partial bridge is assembled at one end of the construction girder. , (C) is a longitudinal front view showing a state in which the first partial bridge is fed to the other end of the construction beam and the second partial bridge is assembled at one end. (A) is a longitudinal front view showing a state in which the second partial bridge is fed into the other end of the construction girder and the third partial bridge is assembled at one end, and (b) is the other end of the construction girder. A longitudinal front view showing a state in which the third partial bridge is fed into the first partial bridge and the fourth partial bridge is assembled at one end, and (c) is a longitudinal front view showing the connection state of the new bridge. (A) Longitudinal front view showing the state where the construction girder is pulled back and removed, (b) Longitudinal front view showing the final stage state where the construction girder is pulled back and removed (c) is for the completed new bridge Longitudinal front view showing the state before removing the scaffolding around the legs and the work girder base

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  First, FIG. 1A shows a bridge over a river as an example of an existing bridge 1 to be removed, and a bridge supported by abutments A1 and A2 provided at both ends of the river width and a plurality of piers provided in the middle. It is composed of a surface 2 and a main structure 3 provided on the upper side from both sides of the bridge surface 2, for example, a truss bridge or an arch bridge having a structure that can be supported in a suspended manner on the upper part of the main structure 3. .

  In FIG. 1 (a), the piers are arranged along the length direction of the existing bridge 1 in order from the one end side on the left side of FIG. 1 (a) in order from the first pier P1, the second pier P2, The third bridge pier P3 is assumed, and the existing bridge 1 is to be removed from the entire length between the abutments A1 and A2.

  The bridge surface 2 of the existing bridge 1 has a plurality of main girders 4 along the entire length in the length direction at regular intervals in the width direction, and a width in which the main girders 4 are arranged in parallel in the length direction at regular intervals. As shown in FIG. 2B, pavement or floor slab concrete 6a is provided on a bridge girder 6 formed by a large number of transverse girders 5 that are long in the direction.

  The main structure 3 is composed of various steel materials. In the illustrated case, the upper chord material 7 along the length direction at the upper part of the bridge surface 2 and the side surfaces of the bridge surface 2 are formed by vertical members 8 and diagonal members 9. An example is shown in which a pair of truss-shaped side surface portions 10 and a truss-shaped top surface portion 11 in which upper chord members 7 on both sides are coupled with cross members and diagonal members are assembled.

  Next, as the equipment used for carrying out the method for removing the existing bridge 1, a work girder 12 inserted through the existing bridge 1 so as to cover the entire length in the length direction, a connection dismantling of the work girder 12, and the existing bridge 1 Is provided on the work pedestal 30 for feeding and pulling back with support, and on the piers P1 to P3, and on the piers P1 to P3. A leg scaffold 14, a carriage 15 installed on the upper surface of the construction girder 13, traveling in the length direction of the construction girder 13, and disposed on land at one end of the existing bridge 1, and sending out the construction girder 12 And a removal facility 16 for lifting and removal, and a lifting facility 17 for lifting the cart 15 and the existing bridge 1 when the cart 15 is loaded on the work beam 12 and the existing bridge 1 is released.

  As shown in FIGS. 2 to 4, the construction girder 12 uses a short construction girder 12a having a cross-sectional shape in which two rectangular cylinders having a required length are juxtaposed, and the short construction girder 12a is fastened with a bolt or the like. The length required to penetrate the entire length of the existing bridge 1 can be obtained by sequentially increasing the number of bridges, and a plurality of strips for moving the carriage 15 along the length direction on the upper surface. The rail 18 is provided.

  As shown in FIG. 1 (b), the work cart 30 is provided with a plurality of units on a rail 31 laid on the land on one end side of the existing bridge 1 along the length direction of the existing bridge 1. When connecting the construction girder 12a, the short work girder 12a is supported and added, and when the construction girder 12 is sent out into the existing bridge 1, the movement is guided and supported when the construction girder 12 is pulled back. In order to carry out the work of dismantling the short work girder 12a, when the work girder 12 is sent out into the existing bridge 1 by the work carriage 30, in order to balance the weight, for example, on the land of the work girder 12 A method is adopted in which a part on the rear end side is lengthened or a weight 32 is placed on the rear end side of the work beam 12.

  As shown in FIGS. 3 and 4, the construction girder base 13 includes a plurality of vent pillars 19 arranged between the main girders 4 of the bridge surface 2 along the width direction of the existing bridge 1. A plurality of supports such as jacks, which are erected on the upper surface, are horizontally supported at the upper ends of the respective vent columns 19 and support the construction beam 12 on the support base 20. The member 21 is provided.

  As shown in FIGS. 4 and 5, the leg-around scaffold 14 includes a scaffold plate 22 and a handrail 23, and the scaffold plate 22 extends from the upper surface of the bridge piers P <b> 1 to P <b> 3 to both sides along the length direction of the existing bridge 1. The handrail 23 is provided so as to surround the upper periphery of the scaffold plate 22.

  The carriage 15 is composed of a self-propelled carriage 15a driven by a motor and a plurality of follower carriages 15b. The existing bridge 1 is hung on the upper surface of the main structure 3 on the upper surfaces of the self-propelled carriage 15a and the follower carriage 15b. A plurality of jacks 24 for supporting in a lowered shape are provided, and the self-propelled carriage 15a, the follower carriage 15b, and the follower carriage 15b are connected via a connecting shaft 15c so as to maintain a predetermined interval. It is possible to move in the length direction of the construction beam 12 along the rail 18 provided on the upper surface.

  4, 6, and 7 show a removal structure and a replacement structure applied to the cross beam 5 of the bridge surface 2 in the existing bridge 1 when the existing bridge 1 is removed.

  As shown in FIG. 4, the removal structure is obtained by cutting and removing the position where the horizontal girder 5 interferes with the vent column 19 of the work girder base 13 by the width of the both-side main girder 4.

  Further, as shown in FIGS. 7A to 7C, the reordering structure is located at a position where the horizontal girder 5 interferes with the vent column 19 of the work girder base 13 as shown in FIG. 7A. The square hole 25 is machined by gas cutting while leaving the upper and lower parts with the width of the main girder 4 on both sides, and bolt holes 26 are drilled at positions on both sides sandwiching the square hole 25. Next, FIG. As described above, a connecting member 27 using a channel material is stretched laterally on one surface side of the square hole 25, and both ends of the connecting member 27 are connected to the cross beam 5 at both sides of the square hole 25 using the bolt holes 26. The bolts and nuts 28 are detachably connected, and then, as shown in FIG. 7 (c), the part 5a left and above the square hole 25 in the cross beam 5 is removed and the divided cross beam 5 is removed. By connecting with the replaced connecting material 27, the existing bridge 1 during the removal work Keeping the intensity constant, bolt, to perform the operation of attaching and detaching the coupling member 27 by a nut 28 when the cross beams 5 pass through the construction of digits for the gantry 13.

  The removal structure and the rearrangement structure with respect to the cross beam 5 are not limited to those in which the removal structure and the rearrangement structure are alternately applied to the arrangement of each cross beam 5, and the strength of the existing bridge 1 during the removal operation is not limited. If it can be maintained, a reordering structure may be set for every plurality of horizontal girders 5, and the removal work may be streamlined to reduce the efficiency of the removal work.

  Next, the 1st removal construction method which performs dismantling removal of the existing bridge 1 from the one end part of this existing bridge 1 is demonstrated mainly using the process drawing of FIG. 8 thru | or FIG.

  FIG. 8 (a) shows the existing bridge 1 to be removed. As shown in FIG. 8 (b), first, as the preceding construction, the rail, paving slab and floor slab of the existing bridge 1 are used for carrying out the other end side. Are sequentially cut, and these are removed and carried to the land side at one end of the existing bridge 1 by using a conveying means such as a truck, so that the prior construction is performed in which the bridge surface 2 is in a state of only the bridge girder 6.

At the time of the above-mentioned preparatory work, at the same time as the removal of the paving slab and floor slab, the leg scaffold 14 and the work girder base 13 are installed on the bridge piers P1 to P3 using the remaining paving slab and floor slab. At the same time, either the removal structure or the rearrangement structure is implemented for each horizontal girder 5 in the bridge girder 6.
As shown in FIGS. 3 and 4, the construction girder base 13 is arranged on each bridge pier P <b> 1 to P <b> 3 so that each vent column 19 fits between the main girder 4 of the bridge girder 6. 4, the portion corresponding to each of the vent columns 19 is cut and removed between the main girders 4 as shown in FIG. 4, and the rearrangement structure of the horizontal girders 5 is as shown in FIGS. A portion corresponding to each vent column 19 is cut and removed and replaced with a connecting member 27.

  Next, rails 31 are laid on the land at one end of the existing bridge 1 along the length direction of the existing bridge 1 as shown in FIG. Further, as shown in FIG. 9A, the feeding equipment 16 and the lifting equipment 17 are installed in the vicinity of the rail.

  As shown in FIG. 9B, the short work girder 12a is carried on the work carriage 30 at one end of the existing bridge 1, and the short work girder 12a is operated by the lifting equipment 17 as shown in FIG. 9C. The initial construction girder 12b having a length L is assembled by being sequentially mounted in a state of being supported on the work cart 30 and mounted on the cart 30, and the length direction thereof is arranged along the length direction of the existing bridge 1, The work girder 12b is sent out to the existing bridge 1 by the delivery facility 16 and a predetermined length is sent out together with the work carriage 30, and the work carriage 30 is removed at the tip of the rail 31 and turned backward, and is stopped at the rear end of the initial construction girder 12b. The short work girder 12a is additionally installed, and the construction girder 12 is extended over the entire length of the existing bridge 1 as shown in FIGS. 10 and 11 by alternately repeating the sending and the addition of the short work girder 12a. It is inserted so as to pass through.

The construction girder 12 sent out to the existing bridge 1 is supported by a work carriage 30 on the land surface, and as the feed progresses, the leading ends thereof are the first pier P1, the second pier P2, and the third pier P3. Each time it passes through, it is supported in turn by the construction girder base 13 provided on the first pier P1, the second pier P2, and the third pier P3 so as not to bend the long construction girder 12. Thus, the existing bridge 1 can be efficiently penetrated through the entire length.
When the construction girder 12 is sent from the land toward the first pier P1, the length of the construction girder 12 located on the land is lengthened in order to balance the weight of the construction girder 12 floating in the air, The weight 32 is placed at the end on the land side, and the construction girder 12 is passed through the entire length of the existing bridge 1 in this way, and both ends of the penetrated construction girder 12 are supported by the abutments A1 and A2. In this construction girder 12 penetrating the existing bridge 1, one land-side end located on the feeding side is set as a temporary placement position B for a small-spreading operation.

  When the installation of the construction beam 12 is completed as described above, the carriage 15 is installed using the lifting equipment 17 on the upper surface of the construction beam 12 at the temporary placement position B as shown in FIG. As shown in (a), the self-propelled carriage 15a and the follower carriage 15b are positioned in one end of the existing bridge 1, and in this state, a predetermined length is provided from one end of the existing bridge 1 as shown in FIG. In this position, specifically, on the part located on one pier P1, the main structure 3 and the main girder 4 of the bridge girder 6 are divided, and the length from one end of the existing bridge 1 to the dividing position is short. It is assumed that the existing split bridge 1a.

  The first dividing position of the existing bridge 1 as described above is performed on the first pier P1, so that the end of the remaining portion of the existing bridge 1 can be left on the first pier P1, and the remaining The collapse of the existing bridge 1 can be prevented from occurring, and the jack 24 provided on the upper surfaces of the self-propelled carriage 15a and the follower carriage 15b is extended upward at the time of dividing work, so that the divided existing bridge 1a is Support at multiple locations.

  The divided existing bridge 1a divided in this way is separated by cutting the main structure 3 and the main girder 4 in an appropriate length range from one end while being supported by the carriage 15. The space of the temporary placement position B is secured by shortening the length of the existing bridge 1a in the longitudinal direction.

  As shown in FIG. 12B, the divided existing bridge 1a shortened by shortening one end of the main structure 3 and the main girder 4 is pulled out to the temporary placement position B by the movement of the carriage 15, and this temporary placement position B Then, the main structure 3 and the bridge girder 6 of the divided existing bridge 1a are divided into small parts, which are loaded onto a transportation means waiting on the land and carried out.

  As described above, when the first divided existing bridge 1a is removed, as shown in FIG. 12C, the self-propelled carriage 15a and the follower carriage 15b are moved toward the remaining existing bridge 1, and the remaining existing bridge 1 is left. Is split at the second pier P2, and the next existing bridge 1b is moved to the temporary placement position B by the carriage 15, and the main structure 3 and the bridge girder 6 are made small in the same manner as described above, and this is put on the ground. Load it on the transportation means and carry it out.

  Note that two sets of carts 15 provided on the construction beam 12 are used, and the existing bridges in which the other carts 15 remain while the divided existing bridges supported by the one cart 15 are separated at the temporary placement position B. The efficiency of the removal work will be improved if it is made to enter the interior of 1 and the remaining existing bridges 1 are carried out in parallel.

  In this way, as shown in FIGS. 13A and 13B, the existing bridge 1 is sequentially divided into divided existing bridges 1a to 1d, transferred to the temporary placement position B, and the divided existing bridge at the temporary placement position B. The main structure 3 of 1a to 1d and the bridge girder 6 are divided into small parts, and this is sequentially loaded and unloaded to the transportation means waiting on the ground, thereby removing the entire length of the existing bridge 1 as shown in FIG. 13 (c).

  When the divided existing bridges 1a to 1d are moved to the temporary placement position B, the removal structure portion of the bridge girder 6 is cut and removed in advance so that the horizontal girder 5 is cut and removed. It can be passed without interference.

  On the other hand, in the portion of the rearrangement structure of the cross beam 5, the disconnected portion of the cross beam 5 is converted to the connecting material 27, so that the existing bridges 1 a to 1 d divided at the position where the connecting material 27 approaches the vent column 19. , And the separated existing bridges 1a to 1d are moved with the connecting member 27 removed, and when the cross beam 5 passes through the vent column 19, the divided existing bridges 1a to 1d are stopped again. 5 is connected by a connecting member 27.

  The reordering operation described above is performed each time the cross beam 5 having the reordering structure passes through the vent column 19, and such reordering allows the cross beam 5 to interfere with the vent column 19 as well as temporarily placing it. The strength of the divided existing bridges 1a to 1d until they are transferred to the position B is kept constant and the safety of the work is ensured, and the refilling work can be performed on the leg circumference scaffolding 14.

  When the entire length of the existing bridge 1 is removed as described above, the self-propelled carriage 15a and the follower carriage 14b are removed from the construction girder 12 as shown in FIGS. 14 (a) and 14 (b). Is pulled out to the ground by the delivery facility 16 and is then disassembled into short construction girders 12a in a state where the retracted part of the construction girders 12 is supported by the work carriage 30, and the length of the construction girders 12 is pulled out and disassembled. The entire length of the construction girder 12 is removed by repeating the process by the same amount.

  When the construction girder 12 is pulled back, when the tip of the construction girder 12 faces the third pier P3, the pulling is stopped, and the leg circumference scaffolding 14 and the work installed on the third pier P3 with the construction girder 12 as a scaffold. The girder base 13 is disassembled and removed, and the disassembled components are gathered to an appropriate size and mounted or placed on the work girder 12 and carried together with the work girder 12 to the retract side. Whenever the tip faces the second pier P2 and the first pier P1, the second pier P2, the leg scaffold 14 and the work girder base 13 of the first pier P1 are disassembled and removed as described above. Collect on land together with construction girder 12.

  If the work girder 12, the leg scaffold 14 and the work girder base 13 are removed in this way, and the work cart 30 and the rail 31, the sending equipment 16 and the lifting equipment 17 on the land are removed, FIG. ), The work is completed with the abutments A1 and A2 and the existing piers P1 to P3 remaining in the river.

  Next, FIGS. 15 (a) and 15 (b) show that the existing bridge 1 is dismantled and removed from both ends of the existing bridge 1 at the same time, improving the efficiency of the removal work, and suitable for removing long existing bridges. The second removal method is shown.

  Since this second removal method is basically the same as the first removal method described above except that the removal work is performed simultaneously from both ends of the existing bridge 1, the same reference numerals are assigned to the same parts as the first removal method. To explain.

  In the second removal method, the rail 31, the work carriage 30, the delivery facility 16 and the lifting facility 17 are installed on the land at both ends of the existing bridge 1, and the piers P <b> 1 to P <b> 1 are connected simultaneously with the construction of the preceding construction on the existing bridge 1. Install the leg scaffolding 14 and the work girder base 13 on P3, and send the work girder 12 that is lengthened while being added on the work carriage 30 into the existing bridge 1 from both ends in the length direction. It is supported by the gantry 13 and the leading ends of both side construction girders 12 are joined at the approximately center position in the length direction of the existing bridge 1 by the progress of feeding, and a carriage 15 is installed on each end of the construction girder 12 in one piece. At the same time, temporary positions B are set at both ends of the construction girder 12, the main structure 3 at the end of the existing bridge 1 described in the first removal method and the bridge girder 6 are separated, and the existing bridge 1 is connected to each pier from both ends. P1 to P3 Steps to cut the existing bridges 1a and 1b from both ends, transfer the divided existing bridges 1a and 1b to the temporary placement position B, divide the main structure 3 at the temporary placement position B and the bridge girder 6 A series of operations such as removal of the construction girder 12 are performed simultaneously at both ends of the existing bridge 1.

  If the removal work of the existing bridge 1 is performed simultaneously from both ends of the existing bridge 1 as in the second removal method, the construction period can be greatly shortened.

  As described above, according to the first and second removal methods of the present invention, the construction girder 12 is penetrated over the entire length of the existing bridge 1, and the construction girder 12 is supported by the abutments A1, A2 and the piers P1 to P3. The separated existing bridges 1a to 1d or 1a and 1b divided at a predetermined length position are supported by the self-propelled carriage 15a and the follower carriage 15b and transferred to the temporary placement position B. At the temporary placement position B, each divided existing bridge is moved. Although the entire length of the existing bridge 1 is dismantled and removed by making it small, it is possible to construct a new bridge construction method using each equipment used for the implementation of this removal construction method.

  FIGS. 16 to 19 show the steps for implementing a new bridge construction method, and the same parts as those in the first removal method described above will be described using the same reference numerals.

  As shown in FIG. 16 (a), with the abutments A1, A2 and a plurality of piers P1, P2, P3 arranged at both ends in the width direction of the river, as shown in FIG. 16 (b), the abutments A1, A2 On the land at one end in the direction in which the piers P1, P2, and P3 are arranged, a work carriage and a lifting equipment 17 are installed on the laid rail on the ground, and the delivery equipment 16 and the short length are installed on the land at the one end. The construction girder 12a is carried in, and the construction girder 12a is sequentially coupled to assemble the construction girder 12, the length direction of the construction girder 12 is sent out onto the piers P1, P2, and P3 by the feeding equipment 16, and the construction girder 12 When the tip faces the first bridge pier P1, the structural scaffolding 14 and the work girder base 13 are installed on the bridge pier P1 by carrying in the components using the construction girder 12 that has stopped feeding, and FIG. 16 (c). Construction girder 1 as Each time the tip of the pier faces the piers P2 and P3, the leg circumference scaffolding 14 and the construction girder base 13 are installed on the piers P2 and P3, and the construction girder bases 13 support the middle so that both ends of the pier A1 and A construction girder 12 having a length reaching A2 is installed.

  As shown in FIG. 17A, one end of the work girder 12 supported by the work girder mounts 13 of the abutments A1 and A2 and the piers P1, P2 and P3 is set as the temporary placement position B. Assembling work of the first short partial bridge 1e composed of a bridge girder and a main structure by installing a carriage 15 on the temporary placement position B and lifting up materials carried on the ground with a lifting equipment on the work carriage 30 The first partial bridge 1e is transferred to the trolley 15 by being sent to the temporary placement position B and lifted and moved. As shown in FIG. 17 (c), the first supported bridge 1e is supported by the movement of the trolley 15. The partial bridge 1e is transported between the abutment A2 and the pier P3 at the other end, and the support at the carriage 15 is released at this position to place the first partial bridge 1e on the abutment A2 and the pier P3. The following second partial bridge 1 on the work cart 30 on land Assembly, changing place the second portion bridges 1f the carriage 15 has been returned to the temporary placement position B.

  As shown in FIGS. 18 (a) to 18 (c), the third and fourth partial bridges 1g and 1h are sequentially assembled on the work carriage 30 at one end of the construction beam 12, and the third and fourth partial bridges are assembled. 1g and 1h are fed toward the other end of the construction girder 12, and each short bridge is joined to the bridge girder and the main structure, so that all the first to fourth partial bridges 1e to 1h are joined and newly installed. As soon as the bridge 1X is assembled, it is installed between the two abutments A1 and A2.

  When assembling and transferring each of the partial bridges 1e to 1h, the horizontal girder in the bridge girder of these partial bridges is the same as shown in FIGS. 4 and 6, and the work girder base 13 provided on the bridge piers P1 to P3. The interfering position is divided in advance, and after passing through the work girder mount 13, the divided parts are joined together, and the necessary divided parts are joined in advance with a connecting member and connected when passing through the work girder mount 13. Remove the members, pass through the work girder mount, and then reconnect them with connecting materials.

  As shown in FIGS. 19 (a) to 19 (c), when the newly constructed bridge 1X is installed between the two abutments A1 and A2, the work girder 12 from which the carriage 15 has been removed is pulled back to the ground, and its entire length is sequentially increased on the work carriage 30. Dismantling and removing the leg scaffold 14 and the work girder base 13 on the bridge piers P1 to P3 in parallel with the pulling back of the work girder 12, and removing the delivery equipment 16 and the lifting equipment 17, the rail 31 and the work carriage 30 respectively. If a paving slab, floor slab, etc. are constructed on the bridge surface 2 of the bridge 1X, the operation is completed.

  In the case shown in the figure, the new bridge construction method described above is an example of assembling the bridge 1X by sending the construction girder 12 and the partial bridge from one side of the river width. However, the construction girder 12 and the partial bridge are sent from both sides of the river width to bridge the bridge. Of course, it is possible to assemble 1X.

DESCRIPTION OF SYMBOLS 1 Existing bridge 2 Bridge surface 3 Main structure 4 Main girder 5 Horizontal girder 6 Bridge girder 7 Upper chord material 8 Longitudinal material 9 Diagonal material 10 Side surface part 11 Upper surface part 12 Construction girder 13 Construction girder base 14 Leg circumference scaffolding 15 Bogie 16 Feeding equipment 17 Lifting equipment 18 Rail 19 Vent column 20 Support base 21 Support member 22 Scaffold plate 23 Handrail 24 Jack 25 Square hole 26 Bolt hole 27 Connecting material 28 Bolt and nut 30 Work carriage 31 Rail 32 Weight

Claims (6)

The existing bridge that can be supported at the upper part is divided into parts of a predetermined length from one end, with one end being made smaller, and the existing bridge is moved to one end. It is a method of removing the bridge that is dismantled by breaking it down at the position where
Prior work to remove the pavement and floor slabs from the existing bridge surface to make the bridge girder only,
A cross-girder processing step of exchanging and removing each cross-girder of the bridge surface that has become only a bridge girder,
A gantry installation process for installing a girder gantry on the pier,
After the installation step, the construction girder is sent to the inside of the existing bridge while increasing the construction girder from one end, and this construction girder is supported by the construction girder frame, so that the construction of a length corresponding to the total length of the existing bridge is achieved. Construction girder installation process for inserting girder,
In a state where a carriage capable of traveling in the length direction of the construction girder is installed on the construction girder, the main structure and the bridge surface of the existing bridge are divided at a predetermined distance from the end to form a divided existing bridge, A parting process for supporting the existing bridge with a carriage,
An unloading process in which the divided existing bridge supported by the bogie is moved to a temporary position set at one end of the construction beam by moving the bogie, and the divided existing bridge is made small at this temporary position and loaded onto the ground side; Consists of
A method of removing an existing bridge in which the entire length of the existing bridge is removed by repeating the dividing process and the unloading process for the length of the existing bridge, and then the work girder and the work girder stand are removed. The existing bridge that can be supported on the upper part is divided into both predetermined length positions from both ends to make a divided existing bridge, and this divided existing bridge is connected to both ends of the existing bridge. It is a method of removing the bridge that is dismantled by breaking it apart at the position moved to the section side,
Prior work to remove the pavement and floor slabs from the bridge surface of the existing bridge and to make the bridge girder only,
A cross-girder processing step of exchanging and removing each cross-girder of the bridge surface that has become only a bridge girder,
A gantry installation process for installing a girder gantry on the pier,
The construction girder is sent inward from both ends of the existing bridge, and this construction girder is supported by the construction girder base and the ends of the construction girder on both sides are joined to each other to meet the total length of the existing bridge. A construction girder installation process for inserting a length of construction girder,
With multiple trolleys that can run in the length direction of the construction girder installed on the construction girder, the main structure and the bridge surface of the existing bridge are divided at a predetermined distance from both ends to form a divided existing bridge. , A dividing process of supporting the existing bridge with a carriage,
An unloading process in which the divided existing bridges supported by each bogie are moved to temporary placement positions set at both ends of the construction girders by moving the bogies, and the divided existing bridges are made small at the temporary placement positions and loaded onto the ground side. And consist of
A method of removing an existing bridge in which the entire length of the existing bridge is removed by repeatedly performing the dividing step and the unloading step from both ends of the existing bridge, and then removing the work girder and the work girder support.   The part of the existing bridge where the horizontal girder of the existing girder is exchanged is for escaping the interference with the work girder mount when moving the divided existing girder to the temporary position of the work girder by the carriage. 3. The structure in which the remaining portions of the cross beams are joined by a connecting material that can be attached and detached, and the portions in which the cross beams are exchanged are refilled when passing through the work beam support. The removal method of the existing bridge described in 1.   The method for removing an existing bridge according to any one of claims 1 to 3, wherein a scaffolding around the legs is installed on the bridge pier, and the re-placement work for each cross girder is performed on the scaffold.   The carriage installed on the construction girder consists of a self-propelled carriage that runs along the rails provided on the upper surface of the construction girder and a follower truck that is connected to this. The main structure of the existing bridge is divided by the self-propelled carriage and the follower carriage. The removal method of the existing bridge in any one of Claim 1 thru | or 4 which moves to the temporary placement position set to the edge part of a construction girder in the state which supported the multiple places. It is a new construction method of a bridge that assembles a bridge by assembling a short bridge in a state where the bridge that can be supported at the upper part is divided by a predetermined length from the end, and connecting this in order.
A gantry installation process in which a girder gantry is installed on the pier located between the abutments on both sides,
After the installation stage, the construction girder is sent from one abutment side while increasing the construction girder, and this construction girder is supported by the construction girder base, so that a construction girder of a length corresponding to this total length can be obtained over the entire length between the abutments on both sides. Construction girder installation process to be inserted,
With a cart that can run in the length direction of the construction girder installed on the construction girder, assemble a short bridge that is divided into predetermined lengths at one end side of the construction girder, and assemble this short bridge with a cart. An assembly process to support;
The short bridge supported by the bogie is moved toward the other end side of the construction girder by moving the bogie, and consists of a carrying-in process installed between the abutment and the pier and between the piers,
Repeat the above-mentioned short bridge assembly process and carry-in process until the required length of bridge is reached, connect the short bridges to assemble the entire length of the bridge, and then remove the work girder and work girder support Construction method.

Images