JP4962252B2 - Bridge erection method and erection device - Google Patents

Description

  The present invention relates to a bridge erection method and an erection device, and more particularly to an overhang erection method and an erection device for installing an erection device on a bridge.

  The overhanging construction method does not require any support work, and can be used to build bridges between large and medium-sized bridges without being restricted by the topography and traffic at the bridge. It is a construction method.

  The conventional overhanging construction methods used for the construction of steel bridges are as follows.

  As a conventional overhanging construction method that is generally performed, there is a traveler crane construction method in which a traveler crane is installed on a bridge, and a member is moved to an overhanging tip portion of an existing bridge girder by the traveler crane to perform overhanging construction. This construction method can be applied both when the member is supplied from behind the bridge and from directly below the projecting tip, and is highly versatile. However, when the member is lifted by the traveler crane, the weight of the lifted member is added to the existing bridge girder in addition to the weight of the traveler crane itself. Further, when a member is lifted by a traveler crane, a moment is generated by multiplying the crane work radius by the member weight, so that a torsional force or a negative reaction force may occur on an existing bridge. For this reason, it may be necessary to reinforce existing bridges. In addition, when moving a member from the rear to the front on the bridge with a traveler crane, in addition to the member largely deviating from the work area on the bridge to the outside, the work is performed at a high place. There was difficulty in work.

  The overhanging construction method described in Patent Document 1 is a method using an apparatus in which a traveler crane is replaced with a U-shaped frame, and is effective in the construction of a PC girder with a short block length and a heavy weight. However, if it is applied to the construction of steel girders, it will be uneconomical because it will increase the number of joints.

  In Patent Document 2, the bridge girder member is transferred to the tip of the existing bridge girder on the existing bridge girder, transferred from the tip of the existing bridge girder onto the lifter member, and then lowered to the level of the existing bridge girder along the vertical beam member. The method of connecting the bridge girder member to the existing bridge girder is described. However, when connecting a long bridge member to an existing bridge girder, it is necessary to lengthen the entire lift device, which may make it difficult to fix the lift device to the existing bridge girder.

  The overhanging construction method described in Patent Document 3 is a method of using a construction device provided with a traveling girder that can move on a bridge girder that has already been overlaid. After the bridge girder member is lifted from under the bridge by the construction work device provided in the traveling girder, the traveling girder moves on the bridge girder while the bridge girder member is lifted below the bridge girder. Then, after extending the erection girder provided on the traveling girder forward, move the erection work device to the tip of the erection girder, lift the bridge girder member with the lifting machine of the erection work device, and the bridge girder already overhanging Connect to the tip. In this construction method, the center of gravity position of the bridge girder member to be moved is located immediately below the center line of the bridge girder that is already overhanging, so that the torsional force does not act on the existing bridge even when the suspended girder member is moved. However, the apparatus main body to be used is a girder type and has a disadvantage that it is relatively heavy. If the weight of the erection device located at the tip of the existing bridge girder is large, it may be necessary to reinforce the cross section of the existing bridge, which may impair the economy. Moreover, since the apparatus main body is moved while the bridge girder member is suspended, the safety is inferior. Furthermore, since the members are limited to supply from under the bridge, it may be difficult to apply depending on the topography of the bridge point and traffic restrictions.

  Patent Documents 4 and 5 describe a construction method in which a bridge girder member is lifted by a plurality of wires, and the bridge girder member is moved to the end of a bridge girder that is already overhanging and connected to the front end of the bridge girder. However, in any of the construction methods described in Patent Documents 4 and 5, the bridge girder member is limited to supply from under the bridge, so that it may be difficult to apply depending on the landform of the bridge point and traffic restrictions.

  In Patent Document 6, a bridge girder member is lifted by a lifting equipment provided on a trolley of an erection mechanism, the erection mechanism moves to an existing bridge girder end, and the trolley extends along a traveling rail. A method is described in which, after moving to the end, the bridge girder member is lowered by the lifting equipment provided on the carriage, and positioned with respect to the end of the existing bridge girder to be added. In the construction mechanism in this construction method, two beam structures having long projecting portions on the left and right sides are arranged opposite to each other, and a carriage that lifts a bridge girder member moves on the two beam structures. For this reason, since the gravity center position of the bridge girder member to be moved is located immediately above the center line of the existing bridge girder, the torsional force does not act on the existing bridge even when the suspended bridge girder member is moved. However, in order to take a large overhang in the beam structure of the erection mechanism, if the distance between the fixed points of the device is relatively small, the reaction force may increase and the reaction point may need to be reinforced. On the other hand, if the distance between the fixed points of the device is increased, the entire construction mechanism needs to be lengthened, so that there is a drawback that the equipment becomes larger and heavier. Moreover, since the whole construction mechanism moves with the bridge girder member suspended, it is inferior in safety.

  In Patent Document 7, the bridge girder member is moved from the rear of the existing bridge girder to the tip of the existing bridge girder, and the upper surface side of one end portion of the bridge girder member and the upper surface side of one end portion of the existing bridge girder are connected via a hinge. Is rotated around the horizontal axis of the hinge, and the bridge girder member is moved forward to connect with the tip of the existing bridge girder. However, since it rotates around the end of the bridge girder member, the relationship between the center of gravity of the bridge girder member and the support point may change, which may reduce stability during rotation. May be required. In addition, there is a problem in the accuracy and strength of the rotating device that rotates the bridge girder member.

JP 2000-104222 A Japanese Patent Publication No. 6-78602 Japanese Patent Laid-Open No. 10-292317 Japanese Patent No. 2912222 Japanese Patent Laid-Open No. 11-158817 JP 2001-20225 A JP 2007-77656 A

  The present invention has been made to solve the above-mentioned conventional problems, and it is possible to construct a bridge safely with good workability by using a relatively lightweight construction device without using a large construction device. It is another object of the present invention to provide a bridge construction method and a construction device that are favorable in economic efficiency and that are not easily restricted by the topography and traffic at the bridge point.

  The bridge erection method according to the present invention is a bridge erection method in which a bridge girder block is extended and constructed by connecting a bridge girder block continuously to the projecting tip of an existing bridge girder supported by a support such as an abutment or a pier. A column member and one or more beam members connected to the upper ends of the two column members, and the interval between the two column members is wider than the width of the bridge girder block, and the two column members The lower ends of the bridge bridges are pivotally connected to hinges having one horizontal axis perpendicular to the longitudinal direction of the existing bridge girder as a pivot axis, and the existing bridge girder is centered on the pivot axis. A first step of lifting the bridge girder block in a suspension frame that can be rotated in the longitudinal direction, and after the bridge girder block is lifted in the first step, the suspension frame is moved around the rotation axis of the hinge. Rotate as center The second step of moving the entire bridge girder block in the direction of the extension of the existing bridge girder over the extension tip of the existing bridge girder, and the extension of the existing bridge girder beyond the extension tip of the existing bridge girder in the second step A third step of lowering the bridge girder block moved in the overhanging direction and arranging the bridge girder block at a position where the bridge girder block is connected to the overhanging tip of the existing bridge girder; and the overhanging tip of the existing bridge girder in the third step A fourth step of extending and constructing the bridge girder by connecting the rear end of the existing bridge girder in the projecting direction of the bridge girder block arranged at a position to be coupled with the projecting front end of the existing bridge girder. And

  In the second step, when the entire bridge girder block is moved in the projecting direction of the existing bridge girder beyond the projecting tip of the existing bridge girder, the center of gravity of the bridge girder block moves on the shear center axis of the existing bridge girder. Is preferred. Here, the shear center axis of the existing bridge girder is a line connecting points of action that do not cause torsional deformation in the existing bridge girder even when a vertical load is applied to the existing bridge girder.

  It is preferable that the length of the column member of the suspension frame is shortened within a range that does not hinder the movement of the bridge girder block in the second step.

  In the first step, it is preferable to lift the bridge girder block in a state where the suspension frame is tilted in a direction opposite to the direction in which the existing bridge girder is extended, and in the state where the suspension frame is raised vertically, Bridge girder blocks may be lifted.

  In the second step, a compressive force having a component in the projecting direction of the existing bridge girder is applied to the suspension frame to rotate the suspension frame in the projecting direction of the existing bridge girder. After rotating in the projecting direction of the existing bridge girder from the vertical, while applying a tensile force to the suspension frame in the direction opposite to the projecting direction of the existing bridge girder to control the rotation speed of the suspension frame, The suspension frame can be rotated in the extending direction of the existing bridge girder.

  The suspension frame is supported by a rectangular support frame provided with the hinge on the front end side of the existing bridge girder, and in the second step, the bridge girder in a direction opposite to the extension direction of the existing bridge girder. It is preferable that the lower end portion of the block moves in an arc shape by grazing the upper end portion of the support frame at the front end side in the projecting direction of the existing bridge girder as the suspension frame rotates.

  The structure of the column member of the suspension frame may be a truss structure.

  Prior to the step 1, a step of transporting the bridge girder block to a position where it can be lifted by the suspension frame with a carriage moving on a track arranged on the existing bridge girder may be provided.

  The carriage has wheels installed on the front side and the rear end part with respect to the projecting direction of the existing bridge girder, and before the position where the bridge girder block can be lifted by the suspension frame by the carriage. It is preferable that the wheel can be newly constructed by removing the wheel that has been installed closer to the front than the central part, while newly installing the wheel at the head of the carriage, With this newly constructed carriage, the bridge girder block transported up to a position where it can be lifted by the suspension frame can be transported to a position where it can be lifted by the suspension frame.

  When the existing bridge girder projects on both sides of the support part, it is preferable to carry out the bridge erection method at the same time at both projecting leading ends of the existing bridge girder.

  A bridge erection device according to the present invention is a bridge erection device in which a bridge girder block is extended and constructed by connecting a bridge girder block to an overhanging tip of an existing bridge girder supported by a support such as an abutment or a pier. Comprising two hinges having one horizontal axis orthogonal to the longitudinal direction of the two as a rotation axis, two column members and one or more beam members connected to the upper ends of the two column members, The interval between the two column members is wider than the width of the bridge girder block, and the lower end portions of the two column members are rotatably connected to the hinges, respectively, and the rotation shaft of the hinges The suspension frame that is rotatable in the longitudinal direction of the existing bridge girder and the two hinges are provided at the end of the existing bridge girder in the projecting direction side, and the suspension bridge is interposed via the two hinges. Frame and pivotable connection A support frame that rotatably supports the suspension frame, a fixing device that fixes the support frame to the existing bridge girder, and transmits a force applied to the support frame to the existing bridge girder, and the suspension frame And a driving device that applies a force having a longitudinal component of the existing bridge girder to rotate the suspension frame in the longitudinal direction of the existing bridge girder while controlling the rotation speed around the rotation axis. And a lifting device that raises or lowers the bridge girder block.

  The support frame is preferably movable on the existing bridge girder.

  The bridge erection device is a device used when the bridge girder block is arranged at a position to be connected to the projecting tip of the existing bridge girder, and further includes a device capable of finely adjusting the arrangement position of the bridge girder block. It is preferable to provide.

  The structure of the pillar member of the suspension frame may be a truss structure. The drive device is preferably a hydraulic device.

  According to the present invention, without using a large erection device, a relatively light erection device can be used, the bridge can be erected safely with good workability, and the economy is good. Since bridges can be built only on the bridge, it is difficult to be restricted by the topography and traffic at the bridge.

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

  FIG. 1 is a perspective view showing a construction apparatus 10 according to the first embodiment of the present invention.

  The erection device 10 includes a suspension frame 12, a support frame 14, a hinge 16, a suspension frame drive device 18, a lifting device 20, and a fixing device 22.

  The suspension frame 12 is a structure that directly supports the load (suspension load) of the suspended bridge girder block 1 and is connected to the two column members 12A and the upper ends of the two column members 12A as shown in FIG. This is a gate-type structure composed of one beam member 12B. The corners of the column member 12A and the beam member 12B are preferably rigid in terms of safety against lateral loads. The distance between the two pillar members 12A is wider than the width of the bridge girder block 1 so that the suspended bridge girder block 1 can pass between the two pillar members 12A.

  The lower ends of the two column members 12A of the suspension frame 12 are rotatably connected to hinges 16 having a common horizontal axis orthogonal to the longitudinal direction of the existing bridge girder 2 as a rotation axis. The frame 12 is connected to the support frame 14 via two hinges 16 so as to be rotatable in the bridge axis direction (longitudinal direction of the existing bridge girder 2). The hinges 16 are provided on the upper surfaces of the two bridge axis direction members 14A of the support frame 14 at the ends of the existing bridge girder 2 on the projecting direction side, and two hinges are provided in total. The position of the hinge 16 is not limited to the upper surface of the bridge shaft direction member 14A as long as it is an end portion of the existing bridge girder 2 on the projecting direction side. For example, the position of the hinge 16 is on the axis of the bridge shaft direction member 14A. A hinge 16 may be provided on the end face of the end of the bridge axis direction member 14A when the extending direction of the bridge girder 2 is the front. Further, when the bridge axial member 14A is composed of two opposing groove steels, it is on the axis of the bridge axial member 14A and at the tip of the bridge axial member 14A, between the two groove steels. In addition, a hinge 16 may be provided. Also, two short column members are provided on the tip of the bridge shaft direction member 14A (for example, the position where the hinge 16 is provided in FIG. 1) when the extending direction of the existing bridge girder 2 is the front, and the top thereof. A hinge 16 may be provided for each.

  In addition, it is preferable that the beam member 12B can be divided so as to improve transportability and to be applicable to bridges of different scales. Further, the two column members 12A may be inclined so that the distance between them becomes narrower toward the top, and in this case, the shape of the suspension frame 12 is a torii type. However, at the height position where the bridge girder block 1 passes, the interval between the two pillar members 12A needs to be wider than the width of the bridge girder block 1. The beam member 12B has a truss structure composed of two parallel members arranged vertically and a plurality of diagonal members, and both ends of the two parallel members are rigidly connected to the two column members 12A, respectively. Also good.

  The support frame 14 is formed by connecting two bridge shaft direction members 14 </ b> A and two bridge shaft right angle direction members 14 </ b> B to a rectangular shape, and is fixed to the existing bridge girder 2 by a fixing device 22. For the bridge axis direction member 14A and the bridge axis perpendicular direction member 14B, for example, a shape steel such as I-shaped steel can be used. Fixing points of the fixing device 22 to the existing bridge girder 2 are provided on at least the front bridge axis perpendicular member 14B and the rear bridge axis perpendicular member 14B on the both sides of the existing bridge girder 2 with the projecting direction of the existing bridge girder 2 in front. A total of at least 4 points. If the distance between the fixed points in the longitudinal direction of the existing bridge girder 2 is increased, the hanging frame 14 is suspended in the state where the bridge girder block 1 is suspended, and the extending direction of the existing bridge girder 2 (hereinafter referred to as “the extending direction of the existing bridge girder 2”) The reaction force applied to the fixed point is small even if it is tilted in the “abbreviated direction”.

  The shape of the support frame 14 is not particularly limited as long as it can transmit the acting force from the suspension frame 12 to the existing bridge girder 2 via the fixing device 22, and may not be rectangular.

  As described above, the hinges 16 are provided on the upper surfaces of the two bridge shaft direction members 14A of the support frame 14 at the ends of the existing bridge girder 2 on the projecting direction side, and two hinges are provided in total. The two hinges 16 commonly have one horizontal axis orthogonal to the longitudinal direction of the existing bridge girder 2 as a rotation axis, and the suspension frame 12 is connected to the support frame 14 in the bridge axis direction (longitudinal direction of the existing bridge girder 2). To be pivotally connected.

  The suspension frame driving device 18 is a hydraulic cylinder composed of a cylinder 18A and a rod 18B. The rod 18B expands and contracts, so that a compression force or a tensile force having a longitudinal component of the existing bridge girder 2 is applied to the suspension frame 12. In addition, the suspension frame 12 has a role of rotating around the hinge 16 in the bridge axis direction (longitudinal direction of the existing bridge girder 2) while controlling the rotation speed. The suspension frame driving device 18 is provided above the two bridge axis direction members 14 </ b> A of the support frame 14, and two suspension frame driving devices 18 are provided.

  One end of the suspension frame driving device 18 on the cylinder 18A side is an upper surface of the bridge axis direction member 14A of the support frame 14, and a hinge 18C provided at the end opposite to the direction in which the existing bridge girder 2 projects. One end on the rod 18B side is rotatably connected to a hinge 18D provided at the upper end of the column member 12A of the suspension frame 12. When the rod 18B of the suspension frame driving device 18 extends, the suspension frame 12 rotates in the projecting direction around the hinge 16 and when the rod 18B of the suspension frame driving device 18 contracts, the suspension frame 12 becomes hinge 16. It rotates in the direction opposite to the overhang direction around the center. The position at which the hinge 18C at the rear end of the cylinder 18A is provided is not limited to the upper surface of the end of the bridge shaft direction member 14A on the opposite side to the direction in which the existing bridge girder 2 projects, and the hinge 18C in FIG. You may attach to the position which moved to the protruding direction rather than the position. By attaching to such a position, the length of the cylinder 18A can be shortened. Further, the position where the hinge 18C is provided is not limited to the upper surface of the bridge axis direction member 14A, similarly to the hinge 16.

  In the above description, the suspension frame driving device 18 is a hydraulic cylinder including the cylinder 18A and the rod 18B. However, the suspension frame driving device 18 may not be a hydraulic cylinder as long as it can be expanded and contracted. The drive mechanism may be a gear system or a screw system.

  However, when the suspension frame driving device 18 extends and the suspension frame 12 is rotated from a state inclined in the opposite direction to the projecting direction to a state tilted in the projecting direction, an operating point for receiving a force from the suspension frame driving device 18. Since the force acting on the hinge 18D is changed from the compressive force to the tensile force, the drive mechanism of the suspension frame drive device 18 needs to be able to cope with this, and smooth and fast expansion and contraction is possible. A drive mechanism that is easy to control is preferable. In this respect, a hydraulic cylinder is suitable for the drive mechanism.

  The same suspension frame driving device 18 can apply the compressive force having the longitudinal component of the existing bridge girder 2 and the tensile force having the longitudinal component of the existing bridge girder 2 to the suspension frame 12. If possible, even when the suspension frame driving device 18 is disposed only in the direction opposite to the overhanging direction with respect to the hinge 16 as in the erection device 10 of the first embodiment of the present invention, the hanging frame 12 is defined as the overhanging direction. It can be rotated from a state inclined in the opposite direction to a state inclined in the overhanging direction. When the suspension frame driving device 18 is arranged only in the direction opposite to the overhang direction with respect to the hinge 16, the position of the hinge 16 can be brought close to the position of the overhang tip 3 of the existing bridge girder 2, and the bridge girder block 1 is installed. Even when the bridge girder 2 is moved to the front of the projecting tip 3 of the bridge girder 2, it is not necessary to increase the tilt angle of the suspension frame 12 in the projecting direction. Therefore, the tensile force acting on the suspension frame drive device 18 from the suspension frame 12 and the compressive force generated on the column member 12A of the suspension frame 12 can be reduced, the maximum output of the suspension frame drive device 18 can be reduced, and the suspension is suspended. Since the cross section of the column member 12A of the frame 12 can also be reduced, the weight of the entire erection device 10 can be reduced.

  When the suspension frame driving device 18 can only apply a tensile force to the suspension frame 12, the suspension frame 12 is rotated from a state inclined in the opposite direction to the extension direction to a state inclined in the extension direction. For this purpose, it is necessary to dispose the suspension frame driving device 18 on the projecting direction side with respect to the suspension frame 12 and pull the suspension frame 12 from the projecting direction side. In this case, it is difficult to bring the position of the hinge 16 close to the position of the projecting tip 3 of the existing bridge girder 2, and it is difficult to reduce the weight of the entire construction device 10.

  In the erection apparatus 10 in which the suspension frame driving device 18 is disposed only in the direction opposite to the overhanging direction with respect to the hinge 16, as the suspension frame driving device 18, a winch method or a wedge-shaped jack that can apply only a tensile force to the operating point. In order to use the system, the bridge girder block 1 is lifted by the lifting device 20 with the suspension frame 12 slightly tilted in the extending direction so that the suspension frame driving device 18 receives only the tensile force from the hinge 18D as the action point. There is a need. Then, after the bridge girder block 1 is lifted to a predetermined height by the lifting device 20, the bridge girder block 1 is controlled by the suspension frame driving device 18 by controlling only the tensile force on the hinge 18D as the action point and controlling the rotation speed. Further, it is necessary to gradually move the suspension frame 12 in the projecting direction by the weight of the suspension frame 12 so that the bridge girder block 1 is positioned forward of the projecting tip 3.

  The lifting device 20 lifts the bridge girder block 1 transported into the support frame 14 by a transport device (for example, the crane 84 or the carriage 86 shown in FIG. 9), and the bridge girder block 1 is projected by the rotation of the suspension frame 12. After moving forward, the bridge girder block 1 is lowered to a position corresponding to the cross section of the projecting tip 3 of the existing bridge girder 2. Specifically, an electric hoist device, a wire clamp type jack, a winch or the like can be used as the lifting device 20.

  One lifting device 20 is provided near both ends of the beam member 12B of the suspension frame 12, and a total of two lifting devices 20 are provided. Then, when the bridge girder block 1 is raised and lowered, the two devices are synchronized to wind up and lower the suspension wire 20A.

  The installation positions of the two lifting devices 20 are positions such that the distances from the adjacent column members 12A are equal. With this position, when the bridge girder block 1 is moved in the direction of the existing bridge girder 2 by moving the entire bridge girder block 1 beyond the protruding tip 3 of the existing bridge girder 2, the center of gravity of the bridge girder block 1 is 2 on the shear center axis. Here, the shear center axis of the existing bridge girder 2 is a line connecting points of action that do not cause torsional deformation in the existing bridge girder 2 even if a vertical load is applied to the existing bridge girder 2. Since the center of gravity of the bridge girder block 1 moves on the shear center axis of the existing bridge girder 2, the existing bridge girder 2 does not undergo torsional deformation. There is no need to reinforce.

  Further, the installation positions of the two lifting devices 20 are preferably provided on the lower surface of the beam member 12B as close as possible to the column member 12A of the suspension frame 12 so that the bending moment generated in the suspension frame 12 is reduced. This makes it possible to reduce the cross section of the column member 12A and the beam member 12B of the suspension frame 12, and is advantageous for winding the suspension wire 20A and wiring when using the winch.

  The fixing device 22 has a role of fixing the support frame 14 to the existing bridge girder 2 to stop the movement and transmitting a reaction force caused by lifting of the bridge girder block 1 to the existing bridge girder 2. As shown in FIG. 1, the fixing device 22 is provided on both sides of the existing bridge girder 2 at least in the vicinity of the front end portion and the rear end portion of the bridge axial direction member 14 </ b> A with the projecting direction of the existing bridge girder 2 as the front. There are at least four in total. However, it is not necessary to fix the support frame 14 with all of the four fixing devices 22. For example, with the projecting direction of the existing bridge girder 2 as the front, the support frame 14 is fixed to the existing bridge girder 2 with the front two, and the rear The fixing device 22 may have a function of transmitting only the negative reaction force to the existing bridge girder 2. In such a case, axial force is not introduced into the existing bridge girder 2 but axial force is introduced only into the support frame 14. When the support frame 14 is fixed by all of the four fixing devices 22, the axial force introduced into the support frame 14 is also introduced into the existing bridge girder 2.

  As described above, when the bridge girder block 1 is moved to the front of the projecting tip 3 of the existing bridge girder 2, the support frame 14 is fixed at a position where the tilt angle of the suspension frame 12 in the projecting direction is not increased. The position of the hinge 16 is preferably located in the vicinity of the projecting tip 3 of the existing bridge girder 2.

  The configuration of the fixing device 22 and the specific fixing method by the fixing device 22 differ depending on the traveling device that moves the support frame 14. Here, by providing a traveling device for moving the support frame 14, after one bridge girder block 1 is mounted, the support frame 14 is moved to the vicinity of the projecting tip of the existing bridge girder 2 in order to mount the next bridge girder block 1. When doing this, you can work smoothly.

  In 1st Embodiment shown in FIG. 1, the rail 24 is provided in the upper surface of the existing bridge girder 2 as a rail installation. As shown in FIG. 2, the traveling device 26 in the first embodiment includes wheels 26 </ b> A that move on the rail 24 and a drive motor 26 </ b> B, and travels on the rail 24. When this traveling device 26 is used, the fixing device 22 is composed of a rail clamp 22A and a stopper 22B, and the fixing method using the fixing device 22 is a fixing method in which the rail clamp 22A and the stopper 22B are used. Since this traveling device 26 is included in the erection device 10, the erection device 10 is self-propelled.

  When the bridge girder block 1 is suspended and the suspension frame 12 is tilted in the overhanging direction and the bridge girder block 1 is disposed in front of the overhanging tip 3 of the existing bridge girder 2, the fixing provided on the opposite side of the overhanging direction is provided. Since the device 22 may generate a negative reaction force regardless of the fixing method, it is necessary to consider this.

  Further, the moving mechanism of the traveling device that moves the support frame 14 is not limited to a mechanism using a slide mechanism or wheels, but may be a mechanism using a roller, an air caster, or the like. Further, the drive mechanism of the traveling device is not limited to a mechanism using a jack or a mechanism using a motor, and may be a mechanism using an engine, a hydraulic cylinder, a winch or the like. In addition, the fixing device may have a traveling function, and the fixing device may also serve as the traveling device, or the fixing device and the traveling device may be provided separately. Moreover, the rail installation does not need to be a rail, for example, a shape steel may be sufficient.

  Further, when the support frame 14 is tilted in a direction perpendicular to the bridge axis, when the bridge girder block 1 lifted with the overhanging direction as the front is moved from the rear to the front, the lifted bridge girder block 1 may come into contact with the suspension frame 12. Further, the force applied to the suspension frame 12 due to the gravity applied to the suspended bridge girder block 1 also causes a longitudinal component of the beam member 12B. Therefore, the function of adjusting the inclination of the support frame 14 in the direction perpendicular to the bridge axis is fixed. It is preferable to have the device or traveling device.

  Further, when the bridge girder block 1 is transported from the rear to the front of the existing bridge girder 2 with the overhanging direction as the front, a transporting device separate from the construction device 10 may be used. The erection device 10 itself may be used as a transport device for the bridge girder block 1 by traveling. When the construction device 10 itself is used as a transport device for the bridge girder block 1, the bridge girder block 1 is moved while being suspended by the lifting device 20, or the bridge girder block 1 is temporarily placed in the construction device 10 and moved. There is a method, but the latter is preferable from the viewpoint of safety.

  Further, the bridge girder block 1 is arranged at a position corresponding to the cross section of the overhanging tip 3 of the existing bridge girder 2 by the rotation of the suspension frame 12 and the lowering by the lifting device 20, and then the bridge girder block 1 is extended over the overhanging tip 3 of the existing bridge girder 2. As shown in FIG. 3, it is preferable that the erection device 10 is provided with a position fine adjustment device 28 so as to be accurately joined. Specifically, as the position fine adjustment device 28, a chain block, a lever block, or the like can be used. As shown in FIG. 4, one end of a position adjusting device 28 such as a chain block or a lever block is attached to the tip of the rail 24, the other end is attached to the bridge girder block 1, and the cross section of the projecting tip 3 of the existing bridge girder 2 The position fine adjustment device 28 such as a chain block or a lever block is manually operated so that the cross section of the bridge girder block 1 has an appropriate gap. By crossing the chain block and lever block in a plane, not only can the cross-section of the existing bridge girder 2 be adjusted so that the cross-section of the end of the existing girder 2 and the cross-section of the bridge girder block 1 have an appropriate gap, but also the position adjustment in the direction perpendicular to the bridge axis You can also

  Next, the construction apparatus 50 according to the second embodiment of the present invention will be described. In the erection device 50 according to the second embodiment, the hinge 18E, which is an action point at which the suspension frame 12 receives the force from the suspension frame drive device 18, is not the upper end portion of the column member 12A, but as shown in FIG. Is different from the first embodiment.

  For this reason, in 2nd Embodiment, the length of the cylinder 18A of the suspension frame drive device 18 and the expansion-contraction stroke of the rod 18B can be made smaller than 1st Embodiment.

  However, since the hinge 18E, which is the point of action receiving the force from the suspension frame driving device 18, is in the middle of the column member 12A, a bending moment is generated in the column member 12A. For this reason, it is necessary to enlarge the cross section of the column member 12A.

  Next, the construction apparatus 60 according to the third embodiment of the present invention will be described. The construction device 60 of the third embodiment is the same as the second embodiment in that the hinge 18E, which is an action point at which the suspension frame 12 receives force from the suspension frame driving device 18, is in the middle of the column member 12A. As shown in FIG. 6, the structure of the column member 12 </ b> A is a truss structure, which is different from the second embodiment.

  By making the structure of the pillar member 12A a truss structure, even if the hinge 18E, which is an action point at which the suspension frame 12 receives a force from the suspension frame driving device 18, is in the middle of the pillar member 12A, the pillar member 12A is formed into a truss structure. Since only the axial force is generated in each member configured as, the cross section of each member can be significantly smaller than the cross section of the column member 12A of the second embodiment. For this reason, the weight of 12 A of pillar members in 3rd Embodiment can be made lighter than the weight of 12 A of pillar members in 2nd Embodiment.

  The column member 12A in FIG. 6 minimizes the number of members as the truss structure, but the number of members may be increased as in the column member 12A shown in FIG. Since the cross section of each member constituting 12A can be further reduced, the weight of the column member 12A can be further reduced.

  Next, the construction apparatus 70 according to the fourth embodiment of the present invention will be described. The erection device 70 of the fourth embodiment does not configure the column member 12A of the suspension frame 12 as a truss structure, and uses a member that becomes a surface with no gap when viewed from the side as the column member 12A as shown in FIG. This is different from the third embodiment. Specifically, the cross section orthogonal to the longitudinal direction of the member may be an I cross section having an edge as a flange, or may be a box cross section having a hollow inside.

  In the second to fourth embodiments described above, the hinge 18E, which is an action point at which the suspension frame 12 receives force from the suspension frame driving device 18, is not in the upper end portion of the column member 12A but in the middle of the column member 12A. As described above, when the suspension frame 12 is rotated, the length of the cylinder 18A of the suspension frame driving device 18 and the expansion / contraction stroke of the rod 18B can be reduced.

  On the other hand, in the first embodiment in which the hinge 18D, which is an action point at which the suspension frame 12 receives a force from the suspension frame drive device 18, is located at the upper end of the column member 18A, the length of the cylinder 18A of the suspension frame drive device 18 and the rod 18B. However, the axial force acting on the member is reduced.

  Further, in order to reduce the axial force acting on the member, it is preferable to make the length of the column member 12A as long as possible. However, if the length of the column member 12A becomes too long, it becomes difficult to convey the suspension frame 12, so the length of the column member 12A is about 12 m at the maximum.

  Next, the operation | movement at the time of construction using the construction apparatus which concerns on embodiment of this invention is demonstrated.

  FIG. 9 is a side view showing an overview of the overall status of erection using the erection device 60 according to the third embodiment of the present invention. In the bridge according to the left pier 80 in FIG. 9, the bridge girder block 1 is carried onto the bridge by a crane 84 from below the pier 80, and the bridge girder block 1 is placed in the erection device 60 by the crane 84 to perform the erection work. In the bridge related to the pier 82 on the right side of FIG. 9, the bridge girder block 1 is transported from the rear of the existing bridge girder 2 to the erection device 60 located at the projecting tip of the existing bridge girder 2 by the carriage 86 and installed. Doing work. As shown in FIG. 9, the bridge girder block 1 is carried into the erection device 60 by the crane 84 or the carriage 86. However, the case where the bridge girder block 1 can be placed in the erection device 60 by the crane 84 is limited, and when the erection progresses and the position of the overhanging tip 3 is more than a certain distance from the position of the crane 84, a carriage 86 like Transportation equipment is required. In order to cope with this, for example, a carriage 86 may be prepared in both directions in which the existing bridge girder 2 extends.

  In addition, since the fixing device 22 for fixing the support frame 14 is located on the rail 24, when the bridge 86 is transported into the erection device 60 by the carriage 86, when the carriage 86 is a normal carriage, the bridge girder block 1 is fixed. It is difficult to transport the existing bridge girder 2 beyond 22 in the overhang direction.

  In response to this, the bridge girder block 1 can be transported into the erection device 60 by performing work in the procedure as shown in FIGS. 10 (A) to 10 (C).

  As the bogie 86, the bogie 86 shown in FIG. 10 (A), in which a wheel 86A is attached in front of the central portion and a wheel 86B is attached in the vicinity of the rear end with the projecting direction of the existing bridge girder as the front, is shown. Use. Then, as shown in FIG. 10A, the bridge girder block 1 is transported in the projecting direction of the existing bridge girder 2 by the carriage 86.

  As shown in FIG. 10 (B), when the bridge girder block 1 is transported to the front of the position where it can be lifted by the suspension frame 12, a wheel 86C is newly attached to the leading portion of the carriage 86, and more forward than the center portion. The wheel 86A that has been installed is removed, and a carriage 86 is newly constructed.

  With this newly constructed carriage 86, the bridge girder block 1 is transported to a position where it can be lifted by the suspension frame 12, as shown in FIG.

  The procedure of the construction work after the bridge girder block 1 is carried into the construction device 10 by the crane 84 or the carriage 86 will be described with reference to FIGS. FIGS. 11A to 11E are schematic diagrams illustrating the procedure of the erection work after the bridge girder block 1 is carried into the erection device 10 according to the first embodiment of the present invention by the crane 84 or the carriage 86. .

(A) The bridge girder block 1 is lifted by the lifting device 20 as shown in FIG. The suspension frame 12 is inclined to the opposite side of the extending direction of the existing bridge girder 2, and the position of the bridge girder block 1 that is lifted moves upward until the suspension frame 12 reaches the vertical position due to the rotation of the suspension frame 12. The amount of lifting of the suspension frame 12 before turning may be the minimum amount required to ground the bridge girder block 1. When the bridge girder block 1 is lifted by the lifting device 20, in addition to the weight of the suspension frame 12, a compression force due to the weight of the bridge girder block 1 is applied to the suspension frame driving device 18.

(B) The rod 18B of the suspension frame driving device 18 is extended, the suspension frame 12 is rotated about the hinge 16, and the suspension frame 12 is raised until it becomes vertical as shown in FIG. While the suspension frame 12 is rotated to the vertical position, the suspension frame driving device 18 is subjected to a compressive force due to the weight of the suspension frame 12 and the weight of the bridge girder block 1 that is lifted. In the vertical upright state, the compressive force acting on the suspension frame driving device 18 is zero.

(C) As shown in FIG. 11C, the rod 18B of the suspension frame driving device 18 is further extended. If the suspension frame 12 slightly falls in the protruding direction of the existing bridge girder 2 from the vertical standing state, the suspension frame 12 may further fall in the extension direction of the existing bridge girder 2 due to its own weight and the weight of the bridge girder block 1 lifted. And For this reason, in the state of FIG. 11C, a tensile force acts on the suspension frame driving device 18.

  The suspension frame is controlled until the bridge girder block 1 reaches a predetermined position in front of the projecting tip 3 of the existing bridge girder 2 while controlling the extension amount of the rod 18B of the suspension frame driving device 18 and controlling the rotation speed of the suspension frame 12. 12, when reaching a predetermined position, the extension of the rod 18 </ b> B of the suspension frame driving device 18 is stopped, and the suspension (rotation) of the suspension frame 12 is stopped. Thereafter, the suspension wire 20A of the lifting device 20 is unwound, the bridge girder block 1 is lowered to the same height as the cross section of the overhanging tip 3 of the existing bridge girder 2, and then the bridge girder block 1 is connected to the overhanging tip 3 of the existing bridge girder 2. To do.

(D) After connecting the bridge girder block 1 to the projecting tip 3 of the existing bridge girder 2, the suspension wire 20 </ b> A is removed from the hook provided on the bridge girder block 1. Thereafter, as shown in FIG. 11 (D), the rod 18B of the suspension frame driving device 18 is contracted, and the suspension frame 12 is rotated about the hinge 16 in the direction opposite to the extending direction of the existing bridge girder 2 to Return 12 to the state where the existing bridge girder 2 is tilted to the opposite side.

(E) In order to carry out the construction work of the next bridge girder block 1, as shown in FIG. 11 (E), the construction device 10 is placed in front of the projecting tip 3 of the existing bridge girder (on the newly connected bridge girder block 1). Move to.

  As shown in FIGS. 11A to 11C, the bridge girder block 1 is lifted with the suspension frame 12 inclined to the opposite side of the projecting direction from the vertical, and the suspension frame 12 is moved in the projecting direction around the hinge 16. In the case of rotation, as described above, the position of the bridge girder block 1 lifted by the rotation of the suspension frame 12 moves upward until the suspension frame 12 reaches the vertical position. The minimum amount required to ground the bridge girder block 1 is sufficient. For this reason, the amount of movement of the center of gravity of the bridge girder block 1 when it is lifted by the lifting device 20 is reduced, and the safety when the bridge girder block 1 is lifted is increased. Further, the position of the center of gravity of the bridge girder block 1 at the time of lifting by the lifting device 20 is located behind the hinge 16 with the projecting direction of the existing bridge girder 2 in front, so the work of transporting the bridge girder block 1 to the lifting position is compared. Easy.

  The bridge girder block 1 may be lifted by the lifting device 20 with the suspension frame 12 standing vertically. In this case, when the bridge girder block 1 is lifted by the lifting device 20, the suspension frame 12 does not receive a moment centered on the hinge 16, so that the bridge girder block 1 can be lifted in a stable state. On the other hand, the height of the suspension frame 12 is highest when standing vertically, and the height decreases as the suspension frame 12 rotates in the overhanging direction. In the case of lifting with the bridge girder block 1 is the highest point. Therefore, when the bridge girder block 1 is lifted by the lifting device 20 with the suspension frame 12 standing vertically, the lifting amount by the lifting device 20 becomes large, and the movement amount of the center of gravity of the bridge girder block 1 at the time of lifting by the lifting device 20 becomes large. In addition, the position of the center of gravity of the bridge girder block 1 at the time of lifting by the lifting device 20 becomes higher. This point is negative for stability.

  Further, the bridge girder block 1 may be lifted by the lifting device 20 in a state in which the suspension frame 12 is slightly inclined in the projecting direction of the existing bridge girder 2 from the vertical. In this case, the suspension frame driving device 18 receives a tensile force from the hinge 18D which is an action point. Then, after the bridge girder block 1 is lifted to a predetermined height by the lifting device 20, the suspension frame driving device 18 controls only the tensile force on the hinge 18D as the action point to control the rotation speed of the suspension frame 12. The suspension girder block 1 and the suspension frame 12 are gradually lowered in the projecting direction by the dead weight of the bridge girder block 1 and the suspension frame 12, and the bridge girder block 1 can be positioned in front of the projecting tip 3 of the existing bridge girder 2.

  Accordingly, when the suspension frame 12 is lifted by the lifting device 20 while the suspension frame 12 is slightly tilted in the projecting direction of the existing bridge girder 2 with respect to the vertical, the suspension frame 12 is rotated as the suspension frame driving device 18. A winch system or a wedge-shaped jack system that can apply only a tensile force to the operating point can be used.

  However, in order to lift the bridge girder block 1 with the suspension frame 12 slightly tilted in the projecting direction of the existing bridge girder 2 from the vertical, the center of gravity position of the bridge girder block 1 is more forward than the hinge 16 in the projecting direction before lifting. It is necessary to transport the bridge girder block 1 so as to be positioned, and this transport takes time.

  As described above, the position at which the support frame 14 is fixed should be such that the hinge 16 is in the vicinity of the projecting tip 3 of the existing bridge girder 2, but the height of the column member 12A of the suspension frame 12 is erected. The column member 12A of the suspension frame 12 is within a range that does not hinder the movement of the bridge girder block 1 due to the rotation of the suspension frame 12 in terms of reducing the overall size of the devices 10, 50, 60, 62 and reducing the weight. It is preferable to shorten the length.

  Further, when the bridge girder is erected in both directions with respect to the direction of the bridge axis around the pier, as in the case of the bridge girder in the bridge pier 80 of FIG. Is preferably performed at the same time at both overhang ends in order to balance the overhang length of the bridge girder from the pier and reduce the bending moment generated in the pier.

  The procedure of the erection work after the bridge girder block 1 is carried on the erection device 10 has been described above, but the process according to FIG. 11C is further divided into the processes shown in FIGS. This will be further described with reference to E).

(A) As shown in FIG. 12A, by adjusting the expansion / contraction amount of the rod 18B of the suspension frame driving device 18, the bridge girder block 1 is moved to a predetermined position in front of the projecting tip 3 of the existing bridge girder 2 (existing bridge girder). 2) and the rear end of the overhanging girder block 1 and the rear end of the bridge girder block 1 are stopped at a suitable position).

(B) As shown in FIG. 12B, the suspension wire 20 </ b> A of the lifting device 20 is wound down, and the bridge girder block 1 is lowered to the same height as the section of the projecting tip 3 of the existing bridge girder 2.

(C) As shown in FIG. 12C, by finely adjusting the amount of expansion / contraction of the rod 18B of the suspension frame driving device 18, the inclination of the suspension frame 12 is finely adjusted, and the suspension wire 20A of the lifting device 20 is adjusted. By finely adjusting the amount of unwinding, the cross section of the projecting tip 3 of the existing bridge girder 2 and the cross section of the rear end of the bridge girder block 1 are made to face each other.

(D) As shown in FIG. 12 (D), the position fine adjustment device 28 such as a chain block or a lever block is used to further finely adjust the position while pulling the bridge girder block 1 to the projecting tip 3 of the existing bridge girder 2 to Bolts or pins are inserted into unillustrated holes and connecting plate holes (not shown) provided in the overhanging tip 3 of the bridge girder 2 and the bridge girder block 1 to connect the overhanging tip 3 of the existing bridge girder 2 to the bridge girder block 1. A predetermined contact state is established.

  As described above, when the bridge girder block 1 is pulled toward the projecting tip 3 of the existing bridge girder 2 by the position fine adjustment device 28, the position needs to be finely adjusted. A jig for making this fine adjustment unnecessary is used as the existing bridge girder 2. It is preferable to provide it at the protruding tip 3 and the bridge girder block 1.

(E) As shown in FIG. 12 (E), the overhanging tip 3 of the existing bridge girder 2 and the bridge girder block 1 are connected by a high-strength bolt joint or a welded joint.

  The procedure of the erection work after the bridge girder block 1 has been carried into the erection device 10 has been described above in detail. It supplements about the influence which the position of bridge girder block 1 before a movement has.

  First, regarding the fixing position of the erection device 10, when the erection device 10 is not near the projecting tip 3 of the existing bridge girder 2, it is necessary to increase the tilt angle of the suspension frame 12 as shown in FIG. 13. is there. When the tilt angle of the suspension frame 12 is increased, the tensile force applied to the suspension frame driving device 18 and the compression force applied to the column member 12A of the suspension frame 12 are increased. Further, the reaction force generated at the fixing point for fixing the support frame 14 to the existing bridge girder 2 is also increased. In addition, even if it does not change a tilt angle, it can cope with making the height of the suspension frame 12 high, but in this case, while the weight of the construction apparatus 10 becomes heavy, the transportability of the suspension frame 12 worsens.

  Further, when the suspension frame 12 is tilted in the projecting direction of the existing bridge girder 2 after the suspension frame 12 is in an upright state, the position of the bridge girder block 1 is lowered. Therefore, when the erection device 10 is not close to the projecting tip 3 of the existing bridge girder 2 so that the bridge girder block 1 does not come into contact with the existing bridge girder 2 when the suspension frame 12 is tilted in the projecting direction of the existing bridge girder 2. Before the suspension frame 12 is rotated, it is necessary to lift the bridge girder block 1 sufficiently high. For this reason, the center of gravity of the bridge girder block 1 is increased, and the vertical movement of the center of gravity of the bridge girder block 1 is increased when the suspension frame 12 is rotated, so that the stability at the time of installation is deteriorated.

  Therefore, it is advantageous in terms of safety and economy that the erection device 10 is as close as possible to the projecting tip 3 of the existing bridge girder 2 as long as it does not protrude from the projecting tip 3 of the existing bridge girder 2.

  Next, regarding the height of the pillar member 12A of the suspension frame 12 and the position of the bridge girder block 1 before the suspension frame 12 is rotated, for example, as shown in FIG. It is preferable to determine the height of the column member 12A and the position of the bridge girder block 1 before the suspension frame 12 is rotated so that 1A passes through the upper end portion 14C of the support frame 14 in the projecting direction. In this case, after the lower end 1 </ b> A of the bridge girder block 1 in the direction opposite to the protruding direction passes through the upper end 14 </ b> C of the support frame 14 in the protruding direction, the entire suspension girder block 1 is rotated by the rotation of the suspension frame 12. When the suspension frame 12 is passed over, the suspension frame 12 stops rotating, and after the suspension frame 12 stops rotating, the wire 20A is unwound by the lifting device 20, and the bridge girder block 1 is attached to the extension bridge tip 3 of the existing bridge girder 2. Lower until the same height as the cross section. In FIG. 14, the lower end 1 </ b> A of the bridge girder block 1 in the direction opposite to the extension moves as i → ii → iii → iv → v. By setting it as such a movement path | route, while the moving distance of the gravity center of the bridge girder block 1 can be shortened, construction time can be shortened and the safety | security at the time of construction can be improved.

  Furthermore, as described above, the height of the column member 12A of the suspension frame 12 is based on the rotation of the suspension frame 12 in that the overall size of the erection devices 10, 50, 60, 62 is reduced and the weight is reduced. It is preferable to shorten the length of the column member 12A of the suspension frame 12 as much as possible within a range that does not hinder the movement of the bridge girder block 1.

The perspective view which shows the construction apparatus of 1st Embodiment of this invention. The side view which shows the traveling apparatus in 1st Embodiment. Side view showing a construction apparatus provided with a position fine adjustment device Side view showing the installation of the fine position adjustment device The side view which shows the construction apparatus of 2nd Embodiment of this invention The side view which shows the construction apparatus of 3rd Embodiment of this invention The side view which shows the modification of the construction apparatus of 3rd Embodiment of this invention The side view which shows the construction apparatus of 4th Embodiment of this invention The side view which shows the outline | summary of the whole condition of construction using the construction apparatus which concerns on 3rd Embodiment of this invention. Side view showing the situation where a bridge girder block is being transported on a construction device by a carriage Side view showing the outline of the procedure of the construction work after the bridge girder block is carried on the construction device Side view showing the process according to FIG. Side view showing the case where the erection device is not near the projecting tip of the existing bridge girder Side view schematically showing an example of the movement path of the bridge girder block

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Bridge girder block 1A ... Lower end part 2 ... Existing bridge girder 3 ... Overhanging front end 10, 50, 60, 62 ... Construction device 12 ... Hanging frame 12A ... Column member 12B ... Beam member 14 ... Support frame 14A ... Bridge axial direction member 14B ... Bridge axis perpendicular member 14C ... Upper end 16 ... Hinge 18 ... Suspension frame drive device 18A ... Cylinder 18B ... Rod 18C, 18D, 18E ... Hinge 20 ... Lifting device 20A ... Suspension wire 22 ... Fixing device 22A ... Rail clamp 22B ... Stopper 24 ... Rail 26 ... Traveling device 26A ... Wheel 26B ... Drive motor 80, 82 ... Bridge pier 84 ... Crane 86 ... Bogie 86A, 86B, 86C ... Wheel

Claims (16)

A bridge erection method in which a bridge girder block is extended and constructed by connecting a bridge girder block to the projecting tip of an existing bridge girder supported by a support part such as an abutment or a pier,
Two column members and one or more beam members connected to the upper ends of the two column members, and the distance between the two column members is wider than the width of the bridge girder block, and the two Each of the lower end portions of the column members is rotatably connected to a hinge having a single horizontal axis orthogonal to the longitudinal direction of the existing bridge girder as a rotation axis, and the existing installation centering on the rotation axis. A first step of lifting the bridge girder block in a suspension frame that is rotatable in the longitudinal direction of the bridge girder;
After the bridge girder block is lifted up in the first step, the suspension frame is rotated around the rotation axis of the hinge, so that the entire bridge girder block passes over the projecting tip of the existing bridge girder. A second step of moving in the overhang direction of the existing bridge girder;
The bridge girder block moved in the projecting direction of the existing bridge girder over the projecting tip of the existing bridge girder in the second step is lowered and arranged at a position to connect the bridge girder block with the projecting tip of the existing bridge girder. A third step of allowing
In the third step, the bridge girder is extended by connecting the rear end of the existing bridge girder in the projecting direction of the existing bridge girder with the projecting front end of the existing bridge girder arranged at the position to be coupled with the projecting front end of the existing bridge girder. A fourth step of
A method for erection of a bridge characterized by including:   In the second step, when the entire bridge girder block is moved in the projecting direction of the existing bridge girder beyond the projecting tip of the existing bridge girder, the center of gravity of the bridge girder block moves on the shear center axis of the existing bridge girder. The bridge construction method according to claim 1.   The bridge girder block according to claim 1 or 2, wherein the length of the column member of the suspension frame is shortened within a range that does not hinder the movement of the bridge girder block in the second step. Method.   4. The bridge according to claim 1, wherein in the first step, the bridge girder block is lifted in a state in which the suspension frame is tilted in a direction opposite to a protruding direction of the existing bridge girder. Construction method.   The bridge erection method according to any one of claims 1 to 3, wherein, in the first step, the bridge girder block is lifted with the suspension frame raised vertically.   In the second step, a compressive force having a component in the projecting direction of the existing bridge girder is applied to the suspension frame to rotate the suspension frame in the projecting direction of the existing bridge girder. After rotating in the projecting direction of the existing bridge girder from the vertical, a tensile force having a component in a direction opposite to the projecting direction of the existing bridge girder is applied to the suspension frame to control the rotation speed of the suspension frame. 6. The bridge erection method according to claim 4, wherein the suspension frame is rotated in the projecting direction of the existing bridge girder.   The suspension frame is supported by a rectangular support frame provided with the hinge on the front end side of the existing bridge girder, and in the second step, the bridge girder in a direction opposite to the extension direction of the existing bridge girder. The lower end portion of the block moves in an arc shape by grazing the upper end portion of the support frame at the front end side in the extending direction of the existing bridge girder as the suspension frame rotates. A method of erection of the bridge described in Crab.   The bridge construction method according to any one of claims 1 to 7, wherein a structure of a pillar member of the suspension frame is a truss structure.   Before the first step, the vehicle includes a step of transporting the bridge girder block to a position where the bridge girder block can be lifted by the suspension frame with a carriage moving on a track disposed on the existing bridge girder. The bridge construction method according to any one of claims 1 to 8.   The carriage has wheels installed on the front side and the rear end part with respect to the projecting direction of the existing bridge girder, and before the position where the bridge girder block can be lifted by the suspension frame by the carriage. A new wheel is installed at the head of the cart, and the wheel that was installed closer to the front than the center can be removed to form a new cart. The bridge construction method according to claim 9, wherein the bridge girder block transported to a position where the suspension frame can be lifted by the suspension frame is transported to a position where the bridge girder block can be lifted by the suspension frame. .   The bridge erection method according to any one of claims 1 to 10 is performed at the same time at both ends of the existing bridge girder, the existing bridge girder projecting on both sides of the support part. A bridge erection method characterized by A bridge erection device that extends a bridge girder by connecting a bridge girder block to the projecting tip of an existing bridge girder supported by a support such as an abutment or a pier,
Two hinges having one horizontal axis perpendicular to the longitudinal direction of the existing bridge girder as a rotation axis;
Two column members and one or more beam members connected to the upper ends of the two column members, and the distance between the two column members is wider than the width of the bridge girder block, and the two A lower end portion of each column member is rotatably connected to the hinge, and a suspension frame that is rotatable in the longitudinal direction of the existing bridge girder around the rotation axis of the hinge,
The two hinges are provided at the end of the existing bridge girder in the projecting direction side, and are pivotally connected to the suspension frame via the two hinges so as to pivotally support the suspension frame. A supporting frame to
A fixing device for fixing the support frame to the existing bridge girder, and transmitting a force applied to the support frame to the existing bridge girder;
A force having a longitudinal component of the existing bridge girder is applied to the suspension frame to rotate the suspension frame around the rotation axis while controlling the rotation speed in the longitudinal direction of the existing bridge girder. A driving device to be moved;
A lifting device for raising or lowering the bridge girder block;
A bridge erection device characterized by comprising:   The bridge erection device according to claim 12, wherein the support frame is movable on the existing bridge girder.   A device used when the bridge girder block is arranged at a position to be connected to the projecting tip of the existing bridge girder, further comprising a device capable of finely adjusting the arrangement position of the bridge girder block. The bridge erection device according to claim 12 or 13.   The bridge erection device according to any one of claims 12 to 14, wherein a structure of a pillar member of the suspension frame is a truss structure.   16. The bridge erection device according to claim 12, wherein the driving device is a hydraulic device.

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