JP2014181452A - Aseismic structure of girder installation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an aseismic structure of a girder installation device capable of improving earthquake resistance with respect to oscillation in a longitudinal direction (a bridge axial direction).SOLUTION: With respect to a suspension girder 7 and a supporting member 31, an aseismic connection member 40 is extended at least in a longitudinal direction D1 with one edge thereof connected to the supporting member 31 and the other edge thereof detachably connected to the suspension girder 7. When the supporting member 31 is immobile with respect to the suspension girder 7, the supporting member 31 is connected to the suspension girder 7 through the aseismic connection member 40 with the other edge thereof connected to the suspension girder 7. Also, because the aseismic connection member 40 is extended at least in the longitudinal direction D1, the same can sufficiently resist oscillation in the longitudinal direction D1. Thus, earthquake resistance in the longitudinal direction D1 can be improved.

Description

  The present invention relates to an earthquake resistant structure for a girder installation device.

  2. Description of the Related Art Conventionally, as a girder erection device that erections a girder material on a bridge pier, the one shown in Patent Document 1 is known. This girder installation device includes a portal-type front tower, a portal-type rear tower, a suspended girder spanned between the front tower and the rear tower, a handrail, and a traveling girder. Yes. In this girder installation device, a front tower and a rear tower are installed on each pier on which a girder is installed, and a traveling girder is installed between the piers. The newly installed girders are transported using the existing girders, and the new girders are transported to the area between the front and rear towers while passing through the inner area of the rear tower, and temporarily placed on the traveling girder. To do. After that, the new girder is lifted with the hanging girder, the traveling girder is pulled out, the hanging girder is lowered, and the new girder is installed between the piers. When the erection is completed, the front tower, the rear tower, the suspension girder, and the handbill are moved along the traveling girder to the installation place for the next girder erection.

JP 2008-303657 A

  The work of bridging the girder material on the pier using the girder construction apparatus as described above requires a certain period of time, and the girder construction apparatus is in a state where it has been installed at the work site for a long period of time. Therefore, it is necessary to ensure earthquake resistance in consideration of the occurrence of vibration due to earthquakes during the construction period. Accordingly, there has been a demand for further improving the earthquake resistance of the girder installation device. In particular, there has been a demand for further improving the earthquake resistance when a vibration occurs in the front-rear direction (bridge axis direction).

  Then, an object of this invention is to provide the earthquake-resistant structure of the girder installation apparatus which can improve the earthquake resistance with respect to the vibration of the front-back direction (bridge axial direction).

  The seismic structure of the girder installation device according to the present invention is a seismic structure of a girder installation device for installing a girder material on a bridge pier, and extends between the front tower and the rear tower that extend in the front-rear direction and face each other in the front-rear direction. Suspended girder, a well girder having a support member disposed so as to surround the suspended girder inside the rear tower, and extending at least in the front-rear direction, connected to the support member at one end side, and to the suspended girder at the other end side A first coupling member coupled releasably.

  The seismic structure of the girder installation device according to the present invention includes a suspended girder extending in the front-rear direction (bridge axis direction) and a well girder having a support member surrounding the suspended girder. For such a support member and suspension girder of the cross beam, the first connecting member extends at least in the front-rear direction, is connected to the support member (cross beam) at one end side, and is released to the suspension girder at the other end side. Connected as possible. Therefore, when the cross beam (that is, the rear tower) moves relative to the hanging girder, the connection of the first connection member is released, so that the other end is connected to the support member of the cross beam on one end side. Since it is not connected to the suspended girder on the side, the movement is possible without being obstructed by the first connecting member. On the other hand, when the movement as described above is not performed, the support member and the suspension girder can be coupled via the first coupling member by coupling the other end of the first coupling member to the suspension girder. it can. Moreover, since the 1st connection member is extended in the front-back direction at least, it can fully support the vibration of the front-back direction. By the above, the earthquake resistance with respect to the vibration of the front-back direction can be improved.

  Moreover, in the earthquake-resistant structure of the girder installation device according to the present invention, the suspension girder has a rail portion extending in the front-rear direction on the lower end side, and by gripping the rail portion on the other end side of the first connecting member. A grip portion connected to the hanging girder is provided, and one end side of the first connecting member is connected to a lower support member (lower beam) extending in the width direction of the hanging girder among the structural members of the cross girder, The one connecting member may be inclined with respect to the rail portion when viewed from above and below (in plan) when the rail portion is supported by the grip portion. The first connecting member can connect the suspended girder and the cross beam in a well-balanced manner by coupling the suspended girder and the cross beam at the lower side of the suspended girder (that is, the lower side of the center of gravity). Moreover, since the 1st connection member hold | grips the rail part of a suspension girder by a holding part, it can perform the connection which can be cancelled | released by a simple structure between suspension girder. Moreover, a 1st connection member connects a suspension girder and a support member so that it may incline with respect to a rail part seeing from an up-down direction. Therefore, the first connecting member can support not only the vibration in the front-rear direction but also the vibration in a direction inclined with respect to the front-rear direction. The cross beam is housed in a sliding guide inside the rear tower, and is structured to be hooked in the front-rear direction against vibration, so that the load can be transmitted to the base of the fixed rear tower.

  Moreover, in the earthquake-resistant structure of the girder installation device according to the present invention, the first connecting member may have an extendable cylinder. As a result, it is possible to change the length of the first connecting member by expanding and contracting the cylinder in a state where the connection of the first connecting member with the hanging girder is released. The position can be changed. This makes it difficult to connect the suspension girder (for example, the connection part connecting the box girders of the suspension girder, the bolt and the attachment plate protrude, and the biting depth to the rail portion is small. Etc.) can be avoided.

  Moreover, the seismic structure of the girder installation device according to the present invention may further include at least a pair of second connection members that are releasably connected to the suspension girder at positions sandwiching the support member in the front-rear direction. By connecting the second connecting member (auxiliary connecting member) to the hanging girder at a position where the supporting member is sandwiched in the front-rear direction, the supporting member and the hanging girder can be connected via the second connecting member. In addition, since the second connecting member is disposed so as to face at least the front-rear direction with the support member interposed therebetween, the vibration in the front-rear direction can be sufficiently supported.

  ADVANTAGE OF THE INVENTION According to this invention, the earthquake resistance with respect to the vibration of the front-back direction can be improved.

It is the schematic block diagram which looked at the girder installation apparatus which employ | adopted the earthquake-resistant structure which concerns on embodiment of this invention from the horizontal direction. Schematic configuration diagram showing how the girders are being transported in order to construct the girders on the pier using the girder construction device (girder transportation and girder construction on the installed girders and on the pier using a carriage (Situation diagram being installed on the traveling girder of the aircraft). Schematic configuration diagram showing the situation when the traveling girder is put forward to install the girder on the pier using the girder construction device (the girder suspended from the girder suspended by the girder of the girder construction machine, It is a situation diagram when the rear end of the traveling girder is deflected and the traveling girder is fed forward by the propulsion jack in the spreader. Schematic configuration diagram showing a state when a girder material is installed on a bridge pier using a girder installation device, and the girder installation device is moved forward to the next girder installation position (the rear end of the hanging girder is vertically supported by a rear receiving car, FIG. 6 is a situation diagram when the traveling girder is on the traveling girder and the traveling girder is made a reaction force by the propulsion jack in the deeding machine and other than the traveling girder is moving forward). It is the figure (front view) which looked at the structure of the rear tower vicinity shown in FIG. 1 from the front-back direction. It is the figure (plan view) which looked at the earthquake-resistant structure of the girder installation apparatus which concerns on embodiment of this invention from the downward direction (direction shown by arrow VI in FIG. 5). It is the figure (side view) which looked at the earthquake-resistant structure of the girder installation apparatus which concerns on embodiment of this invention from the width direction (direction shown by arrow VII in FIG. 6). It is a figure corresponding to FIG. 7, Comprising: It is a figure (side view) which shows the state which connected the auxiliary | assistant connection member to the suspension girder. It is sectional drawing (partial enlarged view of a front view) along the IX-IX line shown in FIG. It is a figure which shows the state of the girder construction apparatus when the seismic structure which concerns on embodiment of this invention is applied. It is the schematic block diagram which looked at the girder installation apparatus for demonstrating the earthquake-resistant structure which concerns on a modification from the horizontal direction. It is an enlarged view which shows the mode of the trolley | bogie which supports a well girder on a hanging girder.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the following description, the same or equivalent elements will be denoted by the same reference numerals, and redundant description will be omitted. The terms “upper” and “lower” correspond to the upper and lower parts in the vertical direction, respectively.

  First, a schematic configuration of the girder installation device 1 will be described with reference to FIG. FIG. 1 is a schematic configuration diagram of a girder installation device 1 including an earthquake-resistant structure 100 according to the present embodiment as viewed from the lateral direction (front-rear direction, that is, a direction perpendicular to the bridge axis direction in a horizontal plane). The girder construction device 1 is a device that constructs the girder material 3 sequentially in the direction A with respect to the pier 2 constructed in advance. In the following description, the front in the direction A is referred to as “front”, and the rear is referred to as “rear”. As shown in FIG. 1, the girder installation device 1 includes a main body 10 including a front tower 4, a rear tower 6, a suspension girder 7 and a hand extender 8, and a traveling girder 9. In the girder installation device 1, the hanging girder 7, the hand extender 8, and the traveling girder 9 constitute members extending in the front-rear direction. In this embodiment, a girder construction structure for laying a rail on which a train travels will be described as an example. However, the girder installation device 1 can be applied to other than the girder construction structure for a train. Further, the present invention can also be applied to a girder installation device without a traveling girder.

  The front tower 4 and the rear tower 6 are portal frame bodies. The front tower 4 is installed on the front pier 2 among the piers 2 on which the girders 3 are installed. The rear tower 6 is installed on the rear pier 2 so as to face the front tower 4 in the front-rear direction. The rear tower 6 has a pair of leg posts 21A and 21B that are spaced apart from each other in the lateral direction and extend in the vertical direction, and a lateral side that extends in the lateral direction and connects the upper end of the leg post 21A and the upper end of the leg post 21B. And a frame member 22 (see FIG. 5). The lower ends of the pillars 21 </ b> A and 21 </ b> B are placed on the horizontal beam of the pier 2. The front tower 4 also has the same configuration as the rear tower 6. The rear tower 6 may be provided with a crank portion 23 for preventing contact with the beam 3 passing through the rear tower 6 in the middle of the pedestals 21A and 21B. However, since the girder 3 does not pass through the front tower 4, the crank portion 23 is not provided.

  The suspension girder 7 extends in the front-rear direction, is disposed in the inner region of the front tower 4 and the inner region of the rear tower 6, and is spanned over the front tower 4 and the rear tower 6. The suspension girder 7 is supported on the front end side by the front tower 4 and supported on the rear end side by the rear tower 6, and is movable in the vertical direction. The suspension girder 7 has a function of suspending the girders 3. The horizontal member 22 of the rear tower 6 is provided with a hydraulic jack 24 extending downward, and the vertical movement of the rear end side of the suspension girder 7 is made by the hydraulic jack 24 (see FIG. 5). Also in the front tower 4, the vertical movement on the front end side of the hanging girder 7 is made by hydraulic jacks 24 </ b> A and 24 </ b> B.

  Inside the rear tower 6, a well beam 30 that supports the hanging girder 7 is arranged. The cross beam 30 has support members 31, 32, 33A, 33B arranged so as to surround the suspended girder 7, and both ends in the width direction are vertically moved together with the suspended girder 7 along the leg columns 21A, 21B of the rear tower 6. Move to. The cross beam 30 includes a support member 31 (lower beam) extending below the suspension girder 7, a support member 32 (upper beam) extending above the suspension girder 7, and a lateral side extending vertically on both sides of the suspension girder 7. Support members 33A and 33B (vertical members). The lower support member 31 extends horizontally in the width direction between the pillars 21A and 21B of the rear tower 6 and supports the suspension girder 7 from below. The upper support member 32 extends horizontally in the width direction between the pillars 21 </ b> A and 21 </ b> B of the rear tower 6. The upper support member 32 has a function of transmitting the weight of the rear tower 6 to the suspension girder 7 when moving in the front-rear direction with the rear tower 6 supported by the suspension girder 7. In addition, it is preferable that there is a carriage 80 with an electric wheel for facilitating movement on the rail on the suspension girder 7 below the support member 32 (upper beam) of the cross beam 30, and the support member 32 (upper beam). If there is a hinge mechanism 81 that connects the center of the bogie 80 and the rear tower 6 and the hanging girder 7 as shown in FIG. The lateral support members 33A and 33B connect both ends of the lower support member 31 and both ends of the upper support member 32, respectively. The lateral support members 33A and 33B also function as guide portions that are guided by the pillars 21A and 21B of the rear tower 6 and move in the vertical direction. Therefore, the support pillars 33A and 33B on the side of the cross beam 30 are accommodated on the leg columns 21A and 21B of the rear tower 6, and the guide 21a for sliding in the vertical direction protrudes, and this is a catch against vibration in the front-rear direction. (See FIG. 6). The hydraulic jacks 24 </ b> A and 24 </ b> B pass through the upper support member 32 and are connected to the lower support member 31. The hydraulic jacks 24A and 24B are respectively disposed between the side surface of the suspension girder 7 and the side support members 33A and 33B.

  The hand extender 8 extends on the pier 2 forward from the front tower 4. The traveling girder 9 extends in the front-rear direction and moves on the pier 2 in the front-rear direction via the hand extender 8. The traveling girder 9 is disposed in the inner region of the front tower 4, the inner region of the rear tower 6, and the inner side of the handrail machine 8.

  Next, with reference to FIGS. 2-4, the process of constructing the girder material 3 to the bridge pier 2 using the girder construction apparatus 1 is demonstrated. 2-4 is a schematic block diagram which shows a mode when the girder material 3 is constructed to the bridge pier 2 using the girder construction apparatus 1. FIG. Here, the case where the girders 3A are installed between the pier 2A and the pier 2B will be described as an example.

  As shown in FIG. 2 (a), a girder 3B has already been installed behind the pier 2A. The rear tower 6 is installed on the pier 2A, and the front tower 4 is installed on the pier 2B. The traveling girder 9 is installed at least between the pier 2A and the pier 2B, and extends further forward than the pier 2B. Behind the rear tower 6, preparation for transporting the newly installed girders 3A is made on the existing girders 3B. That is, the rear end of the girder 3 </ b> A is installed on the rear parent-cart 10 and the front end is installed on the front parent-cart 12. The rear parent car 11 can be separated into an upper child car 11a and a lower main car 11b. The front parent-child cart 12 can be separated into an upper child cart 12a and a lower parent cart 12b. The parent and child carts 11 and 12 can move along rails laid on the existing girders 3B.

  As shown in FIG. 2 (b), the suspended girder 7 is moved upward in order to secure a space for temporarily placing the newly installed girders 3 </ b> A on the traveling girder 9. As the parent and child carts 11 and 12 move forward, the newly installed girder 3A is carried forward. As shown in FIG. 2 (c), when the front parent-child cart 12 reaches the rear end of the traveling girder 9, the child cart 12a remains on the existing beam member 3B while supporting the newly installed beam member 3A. The vehicle leaves the master carriage 12b and moves onto the traveling girder 9. At this time, the newly installed girders 3 </ b> A pass through the inner region of the rear tower 6 and enter the region between the rear tower 6 and the front tower 4. When the newly installed girder 3A moves further forward, the rear parent / child cart 11 reaches the rear end of the traveling girder 9, and the child cart 11a supports the newly installed girder 3A while remaining on the existing girder 3B. The vehicle leaves the master carriage 11b and moves onto the traveling girder 9. As a result, the newly installed girder 3A is temporarily placed on the traveling girder 9 (the state shown in FIG. 3A).

  As shown in FIG. 3 (a), after the newly installed girders 3A are temporarily placed on the traveling girder 9, the girders 3A and the hanging girders 7 are connected, and the girders 3A become the hanging girders. 7 is suspended. After the connection is completed, the suspension girder 7 is moved upward while the newly installed girders 3A are suspended. After the newly installed girders 3A are lifted, the child carriages 11a and 12a move backward from the traveling girder 9 onto the parent carriages 11b and 12b and are connected to the parent carriages 11b and 12b.

  As shown in FIG. 3 (b), the newly installed girder 3 </ b> A is lifted and the child carriages 11 a and 12 a are lowered from the traveling girder 9, and then the traveling girder 9 is pulled out. The traveling girder 9 moves forward via the handbill 8 and is pulled out from the area between the pier 2A and the pier 2B. As shown in FIG. 3C, after the traveling girder 9 is pulled out from the region between the pier 2A and the pier 2B, the hanging girder 7 moves downward, so that the newly installed girders 3A are lowered. As shown in FIG. 4 (a), the rear end of the beam member 3A is installed on the bridge pier 2A, and the front end is installed on the bridge pier 2B, whereby the beam member 3A is interposed between the bridge pier 2A and the bridge pier 2B. Is built. When the installation of the beam member 3A is completed, the connection between the beam member 3A and the hanging girder 7 is released.

  As shown in FIG. 4 (b), the suspension girder 7 is moved upward, and the rear end portion of the suspension girder 7 is supported by the rear end carriage 13. Thus, the rear tower 6 is provisionally received by the hanging girder 7. As shown in FIG. 4C, the spreader 8, the front tower 4 and the rear tower 6 are moved forward using the traveling girder 9 as a guide. Thus, the next girder 3A is moved to a position where it is installed. Here, the next girder 3A is constructed between the pier 2C and the pier 2B, the front tower 4 is installed on the pier 2C, and the rear tower 6 is installed on the pier 2B.

  Next, the earthquake-resistant structure 100 of the girder installation device 1 of the present embodiment will be described with reference to FIGS.

  FIG. 6 is a view of the seismic structure 100 of the girder installation device 1 according to the present embodiment as viewed from below (the direction indicated by the arrow VI in FIG. 5). FIG. 7 is a diagram of the seismic structure 100 of the girder installation device 1 according to the present embodiment as viewed from the width direction (the direction indicated by the arrow VII in FIG. 6). FIG. 8 is a view corresponding to FIG. 7 and showing a state in which the auxiliary connecting member 41 is connected to the hanging girder 7. FIG. 9 is a cross-sectional view taken along line IX-IX shown in FIG. In the following description, the front-rear direction (bridge axis direction), which is the direction in which the front tower 4 and the rear tower 6 face each other, is referred to as “front-rear direction D1”, and the width direction of the suspension girder 7 (bridge-axis orthogonal direction) Will be referred to as “width direction D2”.

  As shown in FIG. 6, the earthquake-resistant structure 100 includes a suspension girder 7 extending in the front-rear direction D1, a support member 31 extending in the width direction D2 and supporting the suspension girder 7 on the lower side, a support member 31, and the suspension girder 7. An earthquake-resistant connecting member (first connecting member) 40, and an auxiliary connecting member (second connecting member) 41 for connecting the support member 31 and the suspension girder 7 in an auxiliary manner.

  The hanging girder 7 includes a pair of box girders 42A and 42B having a rectangular cross section that are arranged in the width direction D2 and extend in parallel in the front-rear direction. The box girders 42A and 42B are connected to each other by a beam member 43 extending in the width direction D2. The box girders 42A and 42B of the hanging girder 7 are divided into a plurality of pieces in the front-rear direction D1 due to size and weight restrictions during transportation and manufacturing. The box girders 42A and 42B continuous in the front-rear direction D1 are connected by a connecting member 44. In addition, a pair of rail portions 46A and 47A extending in the front-rear direction D1 are provided at the lower end portion 42a of the box girder 42A, and a pair of rail portions 46B and 47B extending in the front-rear direction D1 are provided at the lower end portion 42a of the box girder 42B. Is provided. The rail portion 46A is provided along the outer edge portion 42b in the width direction D2 of the lower end portion 42a of the box beam 42A, and the rail portion 47A is the inner edge portion 42c of the lower end portion 42a of the box beam 42A in the width direction D2. It is provided along. The rail part 46B is provided along the outer edge part 42b in the width direction D2 at the lower end part 42a of the box girder 42B, and the rail part 47B is the edge part 42c inside the width direction D2 at the lower end part 42a of the box girder 42B. It is provided along.

  The support member 31 has a rectangular cross section and extends in the width direction D2, and extends to the outside of the width girder D2 from the suspension girder 7 at both ends. A rail receiving member 36 such as a roller or a sandwich sanddle may be provided on the upper end portion 31a of the support member 31 (see FIGS. 7 and 8). The rail receiving member 36 may not be provided. In this case, a guide plate or the like may be welded with a margin so that the hanging girder 7 does not greatly deviate in the width direction D2 (the direction perpendicular to the bridge axis). Further, flange portions 37A, 37B, 37C, and 37D for connecting the earthquake-resistant connecting member 40 are provided on one side end portion 31b of the support member 31. The flange portions 37A, 37B, 37C, and 37D are configured by a plate-like member that protrudes from the position of the upper end portion 31a of the support member 31 so as to spread horizontally in the front-rear direction D1 from the side end portion 31b. (See FIG. 7). Further, flange portions 37E, 37F, 37G, and 37H for connecting the earthquake-resistant connecting member 40 are provided on the other side end portion 31c of the support member 31. The flange portions 37E, 37F, 37G, and 37H are configured by a plate-like member that projects from the position of the upper end portion 31a of the support member 31 so as to spread in the horizontal direction from the side end portion 31c toward the outside in the front-rear direction D1. (See FIG. 7).

  The flange portion 37A is provided on the outer side in the width direction D2 of the box girder 42A of the hanging girder 7, and protrudes from the side end portion 31b of the support member 31 so as to form a substantially triangular shape (the tip side is rounded). (Although the substantially triangular shape may be a semi-circle, etc., it has a shape, thickness, and material that can smoothly disperse and transmit the compressive or tensile force in the front-rear direction D1, and is sufficiently joined by welding or the like. Preferably). The flange portion 37B and the flange portion 37C are integrated as a single plate-like member, and protrude from the side end portion 31b so as to form a substantially trapezoidal shape (corner portions are rounded) as a whole. The flange portions 37B and 37C are provided in a region between the box beam 42A and the box beam 42B, the region on the box beam 42A side corresponds to the flange portion 37B, and the region on the box beam 42B side corresponds to the flange portion 37C. Correspond. The flange portion 37D is provided on the outer side in the width direction D2 of the box girder 42B of the hanging girder 7, and protrudes from the side end portion 31b of the support member 31 so as to form a substantially triangular shape (the tip side is rounded). Yes.

  The flange portion 37E is provided on the outer side in the width direction D2 of the box girder 42A of the hanging girder 7, and protrudes from the side end portion 31c of the support member 31 so as to form a substantially triangular shape (the tip side is rounded). Yes. The flange portion 37F and the flange portion 37G are integrated as a single plate-like member, and protrude from the side end portion 31c so as to form a substantially trapezoidal shape (corner portions are rounded) as a whole. The flange portions 37F and 37G are provided in a region between the box beam 42A and the box beam 42B, the region on the box beam 42A side corresponds to the flange portion 37F, and the region on the box beam 42B side corresponds to the flange portion 37G. Correspond. The flange portion 37H is provided on the outer side in the width direction D2 of the box girder 42B of the hanging girder 7, and protrudes from the side end portion 31c of the support member 31 so as to form a substantially triangular shape (the tip side is rounded). Yes.

  The earthquake-resistant connecting member 40 is a member that extends at least in the front-rear direction D1, is connected to the support member 31 on one end side, and is releasably connected to the hanging girder 7 on the other end side. The earthquake-resistant connecting member 40 includes a long main body portion 51 having a predetermined length, a connecting portion 52 formed on one end side of the main body portion 51 and connected to the flange portions 37A to 37H of the support member 31, and a main body portion. 51 is provided on the other end side of the suspension girder 7 and is connected to the suspension girder 7 by gripping the rail portions 46A, 47A, 46B, 47B of the suspension girder 7.

  The connecting portion 52 is rotatably connected to the flange portions 37A to 37H via pins extending in the vertical direction. Therefore, the earthquake-resistant connecting member 40 can rotate in the horizontal direction around the pin in the connecting portion 52. Therefore, when the suspended girder 7 is moved, the grip portion 53 of the earthquake-resistant connecting member 40 can be removed from the rail portions 46A, 47A, 46B, 47B of the suspended girder 7 and kept away from the suspended girder 7. In addition, the gripping portion 53 has a U-shaped cross section that opens upward, and surrounds the rail portions 46A, 47A, 46B, 47B with the U-shaped cross-section, and the rail portions 46A, 47A, 46B are tightened by bolting. 47B (This bolt has a sharp tip in the shape of a cone, a circle, or a concentric circle in order to efficiently fix the bolt to the rails 46A, 47A, 46B, 47B with a small torque. If you are, you can bite.) The detailed gripping structure of the gripping portion 53 has the same concept as that of the auxiliary connecting member 41, and the gripping structure will be described later. A flange portion 54 that extends horizontally is attached to the grip portion 53, and the flange portion 54 is rotatably connected to the other end portion of the main body portion 51 via a pin extending in the vertical direction. Therefore, when attaching the grip part 53 to the rail parts 46A, 47A, 46B, 47B, the position can be finely adjusted.

  Since the flange portions 37A to 37H are provided at positions different from the rail portions 46A, 47A, 46B, and 47B in the width direction D2, the flange portions 37A to 37H are connected to the flange portions 37A to 37H by the connecting portion 52 and By connecting with the rail portions 46A, 47A, 46B, and 47B, the main body portion 51 of the earthquake-resistant connecting member 40 is inclined with respect to the rail portions 46A, 47A, 46B, and 47B when viewed in the vertical direction. Thereby, the earthquake-resistant connecting member 40 can support not only the vibration in the front-rear direction D1, but also the vibration in the oblique direction with respect to the front-rear direction D1.

  In this embodiment, eight earthquake-resistant connecting members 40A, 40B, 40C, 40D, 40E, 40F, 40G, and 40F are provided. Among them, the earthquake-resistant connecting members 40A, 40B, 40C, and 40D are provided on the side end portion 31b side of the support member 31, and the earthquake-resistant connecting members 40E, 40F, 40G, and 40H are on the side end portion 31c side of the support member 31. Provided. Specifically, the earthquake-resistant connecting member 40A connects the flange portion 37A and the rail portion 46A. The earthquake-resistant connecting member 40B connects the flange portion 37B and the rail portion 47A. The earthquake-resistant connecting member 40C connects the flange portion 37C and the rail portion 47B. The earthquake-resistant connecting member 40D connects the flange portion 37D and the rail portion 46B. The earthquake-resistant connecting member 40E connects the flange portion 37E and the rail portion 46A. The earthquake-resistant connecting member 40F connects the flange portion 37F and the rail portion 47A. The earthquake-resistant connecting member 40G connects the flange portion 37G and the rail portion 47B. The earthquake-resistant connecting member 40H connects the flange portion 37H and the rail portion 46B.

  The lengths of the earthquake-resistant connecting members 40A, 40B, 40C, and 40D provided on the side end portion 31b side of the support member 31 are longer than the earthquake-resistant connecting members 40E, 40F, 40G, and 40H provided on the side end portion 31c side of the support member 31. Too long. That is, the distance between the position where the gripping portion 53 of the earthquake-resistant connecting members 40A, 40B, 40C and 40D grips the rail portions 46A, 47A, 46B and 47B and the support member 31 is the earthquake-resistant connecting members 40E, 40F, 40G, The distance between the support member 31 and the position where the gripping portion 53 of 40H grips the rail portions 46A, 47A, 46B, 47B is larger. Further, the angle formed by the earthquake-resistant connecting members 40A, 40B, 40C, and 40D with respect to the rail portions 46A, 47A, 46B, and 47B is such that the earthquake-resistant connecting members 40E, 40F, 40G, and 40H are connected to the rail portions 46A, 47A, 46B, and 47B. It is smaller than the angle to make.

  If the length of the earthquake-resistant connecting member 40 is too long, buckling (behaves to bend in a direction substantially perpendicular to the compression direction) is likely to occur during compression against vibration, so buckling can be achieved by setting an appropriate length. Strong structure can be obtained. If the cross section is made hard to make it difficult to buckle (such as increasing the thickness or making it three-dimensional), the weight increases or the cross section becomes large, so that it is not possible to make a compact configuration, and it becomes difficult to handle at the time of attachment / detachment. On the other hand, when the length of the earthquake-resistant connecting member 40 is too short, it is difficult to buckle, but the inclination with respect to the rail portions 46A, 47A, 46B, 47B becomes too large, and the vibration component in the front-rear direction D1 may not be sufficiently supported. Therefore, the vibration in the front-rear direction D1 can be sufficiently supported by setting the appropriate length. In this embodiment, by using the long earthquake-resistant connecting members 40A, 40B, 40C, and 40D and the short earthquake-resistant connecting members 40E, 40F, 40G, and 40H, both the advantages of being long and the advantages of being short can be obtained. Examples of such merits include long seismic coupling members 40A, 40B, 40C, 40D and short seismic coupling members 40E, 40F, 40G, 40H when the attachment part and the gripping part of the hanging girder 7 (box girder) overlap. And rearranging. If the position after movement is known in advance and it is determined that the attachment portion and the grip portion 53 overlap, it is possible to rearrange them in advance. The seismic connection member 40 on the side end 31c side of the support member 31 may be lengthened. Moreover, you may make the length of all the earthquake-resistant connection members 40 the same.

  Here, the earthquake-resistant connecting members 40 </ b> A and 40 </ b> D disposed on both end sides in the width direction D <b> 2 of the hanging girder 7 are provided with an extendable hydraulic cylinder 55. That is, the main body portion 51 of the earthquake-resistant connecting members 40 </ b> A and 40 </ b> D includes a cylinder portion 56 and a rod portion 57. In the present embodiment, the grip portion 53 is attached to the distal end side of the rod portion 57, and the connecting portion 52 is provided on the distal end side of the cylinder portion 56. Note that the position of the cylinder portion 56 of the hydraulic cylinder 55 in the normal state is not in a state of being fully extended to the stroke limit, and is not in a state of being contracted to the stroke limit, but is set to an intermediate position with respect to the rod portion 57. It is preferable. As a result, when the portion to be gripped by the grip portion 53 is at a position corresponding to the connection member 44, the connection member 44 can be avoided by extending or contracting the hydraulic cylinder 55. In addition, you may use not only a hydraulic cylinder but an electric gear-type expansion-contraction member.

  On the other hand, the earthquake-resistant connecting members 40B, 40C, 40E, 40F, 40G, and 40H other than the earthquake-resistant connecting members 40A and 40D having the hydraulic cylinder 55 are not extendable and have a fixed length. Specifically, the main body 51 of the earthquake-resistant connecting members 40B, 40C, 40E, 40F, 40G, and 40H is configured by a member that is a plate-like member configured in a long shape. As an example of a cross-sectional structure that is compact but difficult to buckle, a reinforcing portion 58 having a T-shaped cross section or a reinforcing portion 58 by bending an edge portion may be provided (see FIG. 7).

  In the seismic connecting member 40 as described above, the seismic connecting members 40A, 40B, 40C, 40D on the side end 31b side of the support member 31 and the seismic connecting members 40E, 40F, 40G, 40H on the side end 31c side are provided. In some cases, the grip position by the grip portion 53 and the connection member 44 may overlap. In this case, the size of the portion that can be gripped by the gripping portion 53 in the rail portions 46A, 47A, 46B, and 47B is reduced by the interference of the connecting member 44, and the gripping force is reduced. Therefore, in this portion, as shown in FIG. The auxiliary connection member 41 is used in order to compensate for the decrease in the earthquake resistance due to the earthquake-resistant connection member 40 that is thus disconnected from the suspension girder 7.

  A pair of auxiliary connecting members 41 are releasably connected to the hanging girder 7 at a position sandwiching the support member 31 in the front-rear direction D <b> 1 on the lower end side of the hanging girder 7. That is, on the side end portion 31b side of the support member 31, one auxiliary connecting member 41 is connected to the rail portions 46A, 47A, 46B, 47B of the hanging girder 7, and the other auxiliary connecting member 41 is connected to the side end portion 31c side. Connected. At this time, the end 41a of one auxiliary connecting member 41 is arranged to contact the side end 31b, and the end 41a of the other auxiliary connecting member 41 is arranged to contact the side end 31c. Accordingly, the support member 31 is supported in the front-rear direction by the pair of auxiliary connection members 41.

  In the present embodiment, eight auxiliary connecting members 41A, 41B, 41C, 41D, 41E, 41F, 41G, and 41H are used. Among these, the auxiliary connecting members 41A, 41B, 41C, and 41D are used on the side end portion 31b side of the support member 31, and the auxiliary connecting members 41E, 41F, 41G, and 41H are on the side end portion 31c side of the support member 31. Provided. Specifically, the auxiliary connecting member 41A is connected to the rail portion 46A on the side end portion 31b side, and the auxiliary connecting member 41E is connected to the side end portion 31c side, so that the support member 31 is connected to the rail portion. It is sandwiched and supported by the auxiliary connecting members 41A and 41B at the position 46A. The auxiliary connecting member 41B is connected to the side end portion 31b side with respect to the rail portion 47A, and the auxiliary connecting member 41F is connected to the side end portion 31c side, so that the support member 31 is assisted at the position of the rail portion 47A. It is sandwiched and supported by the connecting members 41B and 41F. The auxiliary connecting member 41C is connected to the side end portion 31b side with respect to the rail portion 47B, and the auxiliary connecting member 41G is connected to the side end portion 31c side, whereby the support member 31 is assisted at the position of the rail portion 47B. It is sandwiched and supported by the connecting members 41C and 41G. The auxiliary connecting member 41D is connected to the rail portion 46B on the side end portion 31b side, and the auxiliary connecting member 41H is connected to the side end portion 31c side so that the support member 31 is assisted at the position of the rail portion 46B. It is sandwiched and supported by the connecting members 41D and 41H. Since the auxiliary connecting member 41 is a type of connecting member that is sandwiched and supported, the earthquake resistance performance using the pair of auxiliary connecting members 41 corresponds to the earthquake resistance performance of one earthquake resistant connecting member 40 (auxiliary connecting member 40). When the size of the member 41 is the same as the size of the grip portion 53). Therefore, four seismic connection members 40A, 40B, 40C, 40D on the side end portion 31b side of the support member 31 and the seismic connection members 40E, 40F, 40G, 40H on the side end portion 31c side are provided. Even if all the members 40 are released, the seismic performance can be supplemented by using the eight auxiliary connecting members 41A, 41B, 41C, 41D, 41E, 41F, 41G, and 41F.

  As shown in FIG. 9, the auxiliary connecting member 41 </ b> A includes a body portion 61 having a U-shaped cross section that opens upward so as to surround the rail portion 46 </ b> A, a screw portion 62 for sandwiching the rail portion 46 </ b> A, and a body portion A plurality of ribs 63 for reinforcing 61. The main body 61 has side wall portions 61a and 61a that face both side surfaces 46a and 46a of the rail portion 46A. The screw portion 62 is screwed so as to pass through the side wall portions 61a and 61a, and abuts on both side surfaces 46a and 46a of the rail portion 46A. Thus, the auxiliary connecting member 41A is fixed to the rail portion 46A. A plurality of ribs 63 are provided on the outer surface of the main body 61, and a plurality of ribs 63 are provided so as to face the front-rear direction D1. The auxiliary connecting member 41A is divided into a plurality of pieces (here, two). As a result, the weight of each piece can be suppressed, and the operator can easily carry it. Each piece is provided with a handle 64 for carrying. However, it may not be divided depending on the weight.

  Further, when the auxiliary connecting member 41A is not used, the connection with the rail portion 46A is released. In this case, the auxiliary connecting member 41 </ b> A is stored in a state of being connected to the storage fitting 71. The metal fitting 71 for storage is provided in the flange portion 37A, a fixing portion 72 having an L-shaped cross section fixed to the flange portion 37A, and a prism portion 73 provided at a tip portion on the lower end side of the fixing portion 72, It has. The fixing portion 72 has a portion that contacts and is fixed to the lower surface of the flange portion 37A, and a portion that extends downward from the flange portion 37A. The prism portion 73 is fixed to the lower end portion of the fixed portion 72 that extends downward. The prism portion 73 extends in the front-rear direction D1, and the auxiliary connecting member 41A can be connected by tightening the screw portion 62 as in the case of connecting to the rail portion 46A. The operator can release the connection of the auxiliary connection member 41A connected to the storage bracket 71 to connect to the rail portion 46A, and release the connection of the auxiliary connection member 41A connected to the rail portion 46A. And can be connected to the metal fitting 71 for storage. The auxiliary connecting member 41A and the storage fitting 71 are connected by a chain, thereby preventing the auxiliary connecting member 41A from falling. In addition, even if the seismic connection member 40 is disconnected by the grip portion 53, the state where one end side is connected to the flange portion 37 is maintained, so that a separate storage place is provided like the auxiliary connection member 41A. There is no need to keep it.

  The auxiliary connecting members 41B, 41C, 41D, 41E, 41F, 41G, and 41H have the same structure as the auxiliary connecting member 41A. Each flange portion 37B, 37C, 37D, 37E, 37F, 37G, and 37H is provided with a storage fitting 71 having the same meaning as that provided in the flange portion 37A. Further, the grip portion 53 of the earthquake-resistant connecting member 40 also has the same structure as the auxiliary connecting member 41A (however, it is not necessary to divide it). When attaching and detaching the heavy earthquake-resistant connecting member 40 having an arm, handling is facilitated by temporarily suspending the chain such as a chain block or a lever block with a jig whose length can be easily changed by inserting and removing the chain. Although all of the auxiliary connecting members 41 can be used, the number of places is double that of the arm-type seismic connecting member 40, and the suspension girder is provided in the vicinity of the support member 31 (lower beam) below the well beam 30 to be sandwiched. When the seven contact portions overlap, the fixing effect of the auxiliary connecting member 41 is lowered. As a countermeasure, such a problem may be dealt with by making the rail height under the suspension girder 7 sufficiently higher than the protrusion height of the attachment plate and bolt head of the attachment portion.

  Next, an example of the scene using the above earthquake resistant structure 100 will be described with reference to FIG. In the girder installation device 1 shown in FIG. 10A, the rear tower 6 and the front tower 4 are both supported by the pier 2. The traveling girder 9 passes through both the front tower 4 and the rear tower 6 and is supported by the respective piers 2 that support the front tower 4 and the rear tower 6. Moreover, the traveling girder 9 is fixed in the front-rear direction by a propulsion jack of the hand extender 8 at a position indicated by T in the figure. The hand extender 8 is rigidly connected to the front tower 4 and supported by the pier 2 on the front end side and the rear end side. The suspension girder 7 has a front end side supported by the front tower 4 in the front-rear direction by a cross-girder structure similar to the rear tower 6, and a rear end side supported by the rear tower 6. And between the suspension girder 7 and the rear tower 6, the earthquake-resistant structure 100 which concerns on this embodiment is applied.

  In the state shown in FIG. 10A, when a vibration occurs in the front-rear direction (bridge axis direction), the load is transmitted from the traveling girder 9 to the handrail 8 via the propulsion jack (position indicated by T), It is transmitted to the bridge pier 2 via the front tower 4 and to the suspension girder 7. The load transmitted to the suspension girder 7 is transmitted to the rear tower 6 by the suspension girder 7 being supported by the rear tower 6 in the earthquake resistant structure 100, and is transmitted to the existing girder 3 and the pier 2.

  10 (b) shows a state in the middle of moving the device to the next girder erection position after erection, and the rear tower 6 is supported by the pier 2; The front tower 4 is in a state of floating in the air without being supported between the pier 2 and the pier 2. The traveling girder 9 passes through both the front tower 4 and the rear tower 6, and the rear end side is supported by the pier 2 that supports the rear tower 6. The traveling girder 9 is fixed at a position indicated by T in the drawing with a propulsion jack included in the hand extender 8. The hand extender 8 is supported by the pier 2 on the front end side. The suspension girder 7 is supported at the front end side by the front tower 4 and at the rear end side by the rear receiving carriage 20 disposed on the existing girder 3. And between the suspension girder 7 and the rear tower 6, the earthquake-resistant structure 100 which concerns on this embodiment is applied.

  In the state shown in FIG. 10 (b), when a vibration occurs in the front-rear direction (bridge axis direction), the load is transmitted from the traveling girder 9 to the handrail 8 via the propulsion jack (position indicated by T), It is transmitted to the hanging girder 7 via the front tower 4. The load transmitted to the suspension girder 7 is transmitted to the rear tower 6 by the suspension girder 7 being supported by the rear tower 6 in the earthquake resistant structure 100, and is transmitted to the existing girder 3 and the pier 2. A load from the rear end side of the hanging girder 7 is also transmitted to the rear tower 6 via the earthquake resistant structure 100.

  When it is difficult to support the traveling girder 9 or the rear receiving carriage 20 in the front-rear direction, the rear tower 6 needs to support the entire girder installation device 1, and connection by the earthquake-resistant structure 100 is necessary. In FIG. 10, the angle formed by the suspension girder 7 and the rear tower 6 as viewed from the lateral direction is almost a right angle. However, in order to maintain this angle as much as possible, as shown in FIG. By using the wedge 82 that fits into the wheel of the carriage 80 that is connected to the rear tower 6, the falling mode of the rear tower 6 is suppressed, and the efficiency of vibration transmission in the front-rear direction is improved. In addition, it is easy to handle if the wedge 82 has a handle as a grip portion so that the wedge 82 can be easily attached and detached, and attachment and removal are facilitated by stacking a plurality of pieces. Further, the wedge 82 may be unnecessary by providing a mechanism for pressing the wheel or an outrigger-like member downward by increasing the distance between the axes by using two wheels of the carriage 80 as an axis.

  Next, the operation and effect of the earthquake-resistant structure 100 of the girder installation device 1 according to the present embodiment will be described.

  The seismic structure 100 of the girder installation device 1 according to the present embodiment includes a suspended girder 7 extending in the front-rear direction (bridge axis direction) and a well 30 having a support member 31 extending in the width direction D2 of the suspended girder 7. ing. With respect to the suspended girder 7 and the support member 31, the earthquake-resistant connecting member 40 extends at least in the front-rear direction D1, is connected to the support member 31 at one end side, and can be released to the suspended girder 7 at the other end side. Connected to Therefore, when the support member 31 (that is, the rear tower 6) moves relative to the hanging girder 7, the connection of the earthquake-resistant connection member 40 is released, so that one end side is connected to the support member 31 while Since the other end side is not connected to the suspension girder 7, the movement is possible without being disturbed by the earthquake-resistant connecting member 40. On the other hand, when the movement as described above is not performed, the support member 31 and the suspension girder 7 are connected via the earthquake-resistant connection member 40 by being connected to the suspension girder 7 on the other end side of the earthquake-resistant connection member 40. be able to. Further, since the earthquake-resistant connecting member 40 extends at least in the front-rear direction D1, it can sufficiently support the vibration in the front-rear direction D1. By the above, the earthquake resistance with respect to the vibration of the front-back direction D1 can be improved.

  Further, in the earthquake-resistant structure 100 of the girder installation device 1 according to the present embodiment, the suspension girder 7 has rail portions 46A, 47A, 46B, 47B extending in the front-rear direction D1 on the lower end side, and the other end of the earthquake-resistant connecting member 40. On the side, a grip part 53 connected to the suspension girder 7 by gripping the rail parts 46A, 47A, 46B, 47B is provided, and the earthquake-resistant connecting member 40 is formed of the rail parts 46A, 47A, 46B, When 47B is supported, it is inclined with respect to the rail portions 46A, 47A, 46B, 47B as viewed from above (in plan). The earthquake-resistant connecting member 40 can connect the suspended girder 7 and the cross beam 30 in a well-balanced manner by coupling the suspended girder 7 and the cross beam 30 below the suspended girder 7 (that is, below the center of gravity). Since the earthquake-resistant connecting member 40 supports the rail portions 46A, 47A, 46B, 47B of the suspended girder 7 with the grip portion 53, the seismic coupling member 40 can be releasably coupled with the suspended girder 7 with a simple configuration. . Further, the earthquake-resistant connecting member 40 connects the suspension girder 7 and the support member 31 so as to be inclined (in a direction having a planar angle) with respect to the rail portions 46A, 47A, 46B, 47B when viewed in the vertical direction. . Therefore, the earthquake-resistant connecting member 40 can support not only the vibration in the front-rear direction D1, but also the vibration in the direction inclined with respect to the front-rear direction D1. In addition, the cross beam 30 is configured to be hooked in the front-rear direction against vibration by being accommodated in the slide guide 21 a inside the rear tower 6, and can transmit the load to the base of the fixed rear tower 6. Is possible.

  Moreover, in the earthquake-resistant structure 100 of the girder installation device 1 according to the present embodiment, the earthquake-resistant connecting member 40 has an extendable hydraulic cylinder 55. This makes it possible to change the length of the earthquake-resistant connecting member 40 by expanding and contracting the hydraulic cylinder 55 in a state where the connection between the earthquake-resistant connecting member 40 and the suspension girder 7 is released. The connecting position can be changed. As a result, the position where it is difficult to connect with the hanging girder 7 (for example, the connecting member 44 that connects the box girders 42A and 42B of the hanging girder 7 with the bolts and the attachment plate protrudes, and the rail part is bitten. It is possible to avoid a location where the depth is not secured.

  Moreover, in the earthquake-resistant structure 100 of the girder installation device 1 according to the present embodiment, a pair of releasably connected to the suspension girder 7 on the lower end side of the suspension girder 7 at a position sandwiching the support member 31 in the front-rear direction D1. The auxiliary connecting member 41 is provided. The support member 31 and the suspension girder 7 can be connected via the auxiliary connection member 41 by connecting the auxiliary connection member 41 to the suspension girder 7 at a position sandwiching the support member 31 in the front-rear direction D1. Moreover, since the auxiliary | assistant connection member 41 becomes the arrangement | positioning which opposes at least the front-back direction D1 on both sides of the support member 31, it can fully support the vibration to the front-back direction D1.

  The present invention is not limited to the embodiment described above.

  For example, the number, the mounting position, and the length of the earthquake-resistant connecting member 40 are not limited to the above-described embodiment, and may be changed as appropriate. For example, all the earthquake-resistant connecting members 40 may have the same length. Moreover, the length of each seismic connection member 40 may differ from each other.

  Further, the position and quantity of the seismic coupling member 40 having the hydraulic cylinder 55 are not limited, and may all have the hydraulic cylinder 55 or may not have the hydraulic cylinder 55. . Moreover, although the earthquake-resistant connecting member 40 having the hydraulic cylinder 55 has been used to change the connecting position by the grip portion 53 in the above-described embodiment, it may exhibit other functions. For example, as shown in FIG. 11A, when the support member 31 (that is, the rear tower 6) is inclined with respect to the suspension girder 7, the length of the hydraulic cylinder 55 of the earthquake-resistant connecting member 40 is adjusted. The angle of the support member 31, that is, the rear tower 6 with respect to the suspended girder 7 may be adjusted. This adjustment capability is compensated when the rear tower 6 is displaced at an angle in a plane, and the horizontal beam of the pier that fixes the rear tower 6 is perpendicular to the axis of the suspension girder 7 (girder installation direction). It is effective when it is not. Further, the expansion / contraction force of the earthquake-resistant connecting member 40 may contribute to the support of the rear tower 6. That is, as shown in FIG. 11 (b), the support member 31 is pulled from both sides in the front-rear direction by driving each seismic connection member 40 in the contracting direction and applying a force in the direction indicated by FD 1. The posture of the rear tower 6 can be stabilized. Alternatively, the posture of the rear tower 6 can be stabilized by driving the respective earthquake-resistant connecting members 40 in the extending direction and applying a force in the direction indicated by FD2 so that the support member 31 is pressed from both sides in the front-rear direction. it can. Furthermore, the angle adjustment of the front-back direction of the rear tower 6 which fixed the base using the expansion-contraction force of the earthquake-resistant connection member 40 is possible. When the girder is lowered, the front tower 4 and the rear tower 6 need to be substantially parallel because the front and rear wells are lowered along the slide guides of the front tower 4 and the rear tower 6. Therefore, in order to adjust the angle of the rear tower 6 to the front tower 4, the standing angle can be adjusted with this extension jack. FIG. 11 shows an example in which four extension jacks are used. However, if the extension jacks have a sufficiently large capacity (push / pull force), the two extension jacks are arranged on both sides of the suspension girder 7 as described above. All behaviors can be covered.

  In addition, although the earthquake-resistant connecting member 40 and the auxiliary connecting member 41 are connected to the lower support member 31, they are connected to the upper support member 32 and the upper side of the hanging girder 7, or to the upper side of the well beam carriage and the hanging girder 7. It may be connected. Further, the lateral support members 33 </ b> A and 33 </ b> B may be connected to the lateral side of the suspension girder 7. Arranging the connecting member on the upper side of the hanging girder 7 has an advantage that the attachment / detachment work scaffold can be omitted, but in the illustration of the present embodiment, it is arranged on the lower side to interfere with various facilities when arranged on the upper side of the hanging girder 7. An example is shown. Furthermore, if the connecting members are arranged on the upper and lower surfaces, and the connecting members are arranged on the upper and lower sides, the effect of maintaining the angle in the front-rear direction of the hanging girder 7 and the rear tower 6 (substantially perpendicular state) is obtained. The wedge 82 under the cart 80 shown in FIG. 12 is not necessary.

DESCRIPTION OF SYMBOLS 1 ... Girder construction apparatus, 2 ... Pier, 3 ... Girder material, 4 ... Front tower, 6 ... Rear tower, 7 ... Suspension girder, 8 ... Girder, 9 ... Travel girder, 30 ... Well girder, 40 ... Earthquake-resistant connection Members (first connecting members), 41... Auxiliary connecting members (second connecting members) 46A, 46B, 47A, 47B... Rail portions, 53 .. gripping portions, 55.

Claims (4)

It is an earthquake-resistant structure of a girder erection device that lays girder material on a pier,
A suspension girder extending in the front-rear direction and spanning the front tower and the rear tower facing each other in the front-rear direction,
A well beam having a support member arranged to surround the hanging girder inside the rear tower,
An earthquake-resistant structure for a girder installation device, comprising: a first connection member extending at least in the front-rear direction and connected to the support member on one end side and releasably connected to the suspension girder on the other end side. The hanging girder has a rail portion extending in the front-rear direction on the lower end side,
The other end side of the first connecting member is provided with a grip portion connected to the hanging girder by gripping the rail portion,
The one end side of the first connecting member is connected to a lower support member extending in the width direction of the hanging girder among the support members of the cross beam,
2. The earthquake-resistant structure of the girder installation device according to claim 1, wherein the first connecting member is inclined with respect to the rail portion when viewed from the vertical direction when the rail portion is supported by the grip portion.   The said 1st connection member is an earthquake-resistant structure of the girder installation apparatus of Claim 1 or 2 which has a cylinder which can be expanded-contracted.   The girder according to any one of claims 1 to 3, further comprising at least a pair of second coupling members that are releasably coupled to the suspension girder at positions sandwiching the support member in the front-rear direction. Seismic structure of erection equipment.

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