JP2009002053A - Bridge girder erection apparatus and bridge girder erection method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology which can erect a bridge girder in a manner of substantially eliminating restrictions of construction limits under the bridge girder to be erected, achieves the lowering of the center of gravity when bridge girder members are transported in a bridge axial direction to enable the stable transportation of the bridge girder members in the bridge axial direction, and brings about the improved efficiency of bridge girder erection work. <P>SOLUTION: A sliding girder 10 is mounted to the bridge girder 3, a moving carriage 11 is mounted to the sliding girder 10, and a crane device 12 is mounted to the bridge girder 3. Then the crane device 12 which has a carriage mechanism 13 movable on the bridge girder 3, and a crane mechanism 14 mounted to the carriage mechanism 13 and connected to the mechanism in a connection releasable manner, and suspends a pair of main girders 4 is moved to a location that overlaps one end area of the sliding girder 10 close to a pier. Thereafter the crane mechanism 14 is separated from the carriage mechanism 13 transported to the moving carriage 11 which then moves the crane mechanism on the sliding girder 10. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a technique for installing a bridge girder by sequentially assembling bridge girder members at the tip of a bridge girder that is cantilevered in a bridge axis direction from a bridge girder installed on the upper end of a bridge pier.

  Conventionally, various apparatuses and construction methods have been proposed and put to practical use for the above technique (for example, see Patent Documents 1 to 6). In this kind of technology, when transporting the bridge girder member toward the bridge girder tip in the direction of the bridge axis, as in Patent Documents 1 to 5, the under-girder conveyance method using the space below the bridge girder, and the patent As in Reference 6, it can be broadly divided into a carry system using the space above the bridge girder.

  Here, under the girder transport system, when there are roads, routes, buildings, electric wires (high voltage lines), forests, etc. under the bridge girder to be installed, so-called construction limits are easily affected. May not be erected. On the other hand, the carry-over method is hardly affected by the above-mentioned construction limit, and the carry-on method is superior to the carry-down method in that respect.

  In Patent Document 6, the bridge erection device of Embodiment 3 includes a tower type crane erected in the vicinity of a bridge pier, a transport carriage and an erection mechanism that can move in the bridge axis direction on the bridge girder, and the erection mechanism is a bridge girder. A mechanism main body having a pair of main body side portions opposed to each other in the width direction, and a crane bogie movable on the pair of main body side portions in the bridge axis direction. Equipped with lifting equipment located between the side of the pair body.

  In this bridge erection method, a single member as a bridge girder is lifted from the ground by a tower type crane and placed on a conveyance carriage located on a bridge pier, and the conveyance carriage is moved toward the erection mechanism. In the erection mechanism, the mechanism body is moved to a position where the next bridge girder can be erected, and the crane carriage is kept waiting at the position of one end portion on the pier side of the mechanism body. A single material placed on the transport cart is positioned below the crane cart, then the single material is lifted by a lifting equipment, and the crane cart is moved to the end of the bridge girder. It is transported to the outside of the bridge girder so that it passes between the sides, where a single material is assembled to the bridge girder to construct the bridge girder.

Japanese Patent Laid-Open No. 10-195827 JP-A-9-221718 Japanese Patent Laid-Open No. 11-158817 Japanese Patent Laid-Open No. 10-292317 JP 2005-139831 A JP 2001-20225 A

  In the under-girder conveyance system, as described above, when there are roads, routes, buildings, electric wires (high-voltage lines), forests, etc. under the bridge girder to be erected, it is likely to be subject to the limitations of the building limit, In some cases, the bridge girder cannot be installed, which is disadvantageous compared to the above-mentioned girder conveyance method. Therefore, Patent Document 6 discloses a bridge erection device and a erection method as a carry-on method, but this technique has the following problems.

  A tower type crane is erected near the pier and a single material is lifted from the ground with the tower type crane. That is, this tower type crane is large, and it is necessary to install and operate until a single material necessary for erection of the bridge girder corresponding to each pier is lifted. Therefore, there are problems such as high equipment costs and the need to secure a wide crane installation area near the pier over a long period of time. Due to the latter problem, depending on the situation such as the road near the place where the crane is installed, the operation of the tower type crane is restricted, and the tower type crane may not be installed over a long period of time.

  Here, it is possible to install a crane on a bridge girder instead of a tower type crane. However, as in the case of installing a tower type crane, in order to lift a single bridge girder from the ground and convey it to the bridge girder tip side, together with a crane carriage having a lifting equipment provided in the erection mechanism, 2 Since a set of crane equipment is required, the equipment cost increases. Moreover, when installing a crane on a bridge girder, it is necessary to ensure the installation space of the crane, and there exists a possibility that the crane may interfere with a conveyance trolley | bogie and a construction mechanism.

  Further, in the erection mechanism, the crane truck is used to convey a single material from the position of the pier side one end portion of the mechanism main body to the position of the tip portion so as to pass between a pair of main body side portions, Since the mechanism main body needs to have a structure in which a single material transport space is provided between the pair of main body side portions and the upper part is opened, there is a possibility that the strength and rigidity of the mechanism main body cannot be sufficiently increased. is there. Further, there is a problem that the center of gravity becomes high and is unstable with respect to the lateral force.

  An object of the present invention is to allow a bridge girder to be installed almost without being restricted by the construction limit under the bridge girder to be installed, and to lift the bridge girder member from the ground and to the direction of the bridge axis by a set of crane equipment. To reduce the cost of equipment, to lower the center of gravity when transporting bridge girders in the direction of the bridge axis, to stabilize against lateral force, and to further improve the sliding girder structure. Providing a bridge girder erection device and bridge girder erection method that can ensure the strength and rigidity, realize stable conveyance of the bridge girder members in the direction of the bridge axis, and expect the efficiency of the work of erection of the bridge girder. That is.

  The bridge girder erection device according to claim 1 is a bridge girder erection device for sequentially assembling bridge girder members at the end of the bridge girder that is cantilevered from the bridge girder constructed at the upper end of the pier to the bridge axis direction. A sliding girder equipped to be movable along the bridge girder, a movable carriage equipped on the sliding girder so as to be movable in the direction of the bridge axis, a dolly mechanism movable along the bridge girder on the bridge girder, and the dolly mechanism And a crane mechanism that is connected to the bridge girder so as to be disengageable, and includes a crane device that can convey a pair of bridge girder members in the vertical direction and the bridge axis direction outside the both ends in the width direction of the bridge girder. After moving the crane device carrying the pair of bridge girder members to a position where it wraps on one end of the sliding girder on the pier side of the sliding girder, the crane mechanism is separated from the carriage mechanism and moved to the platform. Was transferred to the above, the movable carriage, characterized by being configured to move the upper sliding girder.

  When constructing a bridge girder, first, in the crane device, the carriage mechanism and the crane mechanism are connected to each other, and a pair of bridge girder is placed by the crane mechanism in a state where the bridge mechanism is located at a predetermined lifting position on the bridge girder (for example, a position near the pier). The member is lifted from the ground outside the both ends in the width direction of the bridge girder. Next, the crane device is moved on the bridge girder tip side by the carriage mechanism. At this time, the crane mechanism holds a pair of bridge girder members above the lower end of the bridge girder, for example, a sliding girder. Hold at the bridge shaft transport position that includes the one end of the pier side and is at the same height as the main body member for mounting and supporting the movable carriage so as to be movable and outside the both ends in the width direction of the main body member. Is desirable.

  Next, after the crane apparatus that holds the pair of bridge girder members is moved by the carriage mechanism to a position where it overlaps with the bridge pier side one end portion of the sliding girder, the crane mechanism is separated from the carriage mechanism to slide the girder. Transferred on the upper moving carriage. At this time, the sliding girder must be moved to a position where the next bridge girder can be installed (for example, a position that cantilevered out of the end of the bridge girder). It is desirable to wait at the position of the side end portion.

  After the crane mechanism is transferred onto the moving carriage on the sliding girder, the moving carriage moves on the sliding girder to the bridge girder tip side, so that the pair of bridge girder members suspended on the crane mechanism is It is transported to the bridge girder tip side outside the both ends in the width direction. At this time, in the same manner as described above, a pair of bridge girder members suspended above the lower end of the bridge girder, for example, a bridge shaft located at the same height as the main body member of the sliding girder and outside the both ends in the width direction of the main body member It is desirable to transport to the front end side of the bridge girder while being held at the transport position.

  Thereafter, the pair of bridge girder members are transported to the outside of the end of the bridge girder and assembled and installed on the front end side of the bridge girder. At this time, it is desirable to assemble the bridge girder member via a crane mechanism. Thereafter, the crane mechanism is moved to the pier side by the moving carriage, and is connected to the carriage mechanism at the position of one end portion of the sliding girder on the pier side, and the crane apparatus is moved to a predetermined lifting position on the bridge girder by the carriage mechanism. Thereafter, the above operation is repeated, and a plurality of pairs of bridge girder members are sequentially assembled at the tip of the bridge girder, and the bridge girder is installed and extended.

  Here, the following configuration can be adopted as a dependent claim of claim 1. The crane mechanism of the crane apparatus includes a pair of suspended girder members at the same height as a main body member including a sliding girder one end portion of the bridge girder and a movable carriage movably mounted and supported. It is held at the bridge shaft conveyance position located outside the both ends in the width direction of the member, and can be conveyed in the bridge axis direction by the carriage mechanism of the crane device and the movable carriage on the sliding girder. The bogie mechanism of the crane apparatus has a bridge girder member placing portion for placing a pair of bridge girder members at the bridge shaft transport position. The crane mechanism of the crane apparatus has a width direction moving means for moving a pair of suspended girder members in the width direction of the bridge girder.

  The cart mechanism of the crane apparatus includes a traveling table having a plurality of traveling wheels and a plurality of pairs of leg members erected on the traveling table, and the crane mechanism of the crane apparatus includes a table member, and the sliding One end portion of the girder on the pier side is configured such that it can be inserted between the plurality of pairs of leg members and below the base member of the crane mechanism, together with the movable carriage disposed thereon. Item 5). The plurality of pairs of leg members of the carriage mechanism are each provided with a hydraulic jack for pushing up the crane mechanism and a spacer that can be removed while the crane mechanism is pushed up. The crane mechanism is configured to be transferred from the carriage mechanism onto the movable carriage by removing each of them (claim 6). After separating the crane mechanism from the carriage mechanism, one end of the sliding girder on the pier side is connected to the bridge girder via the carriage mechanism to function as a counterweight.

  The bridge girder erection method according to claim 8 is a bridge girder erection method in which bridge girder members are sequentially assembled at the end of a bridge girder that is cantilevered from the bridge girder erected on the upper end of the pier in the bridge axis direction. The first step of preparing a sliding girder that can be moved in a cantilevered manner from the bridge girder in the direction of the bridge axis, a movable carriage that can move in the direction of the bridge axis on the sliding girder, and a pair of crane devices A second step of lifting the bridge girder member to the outside of both ends of the bridge girder in the width direction and above the lower end of the bridge girder, and moving the crane device holding the pair of bridge girder members on the bridge girder in the direction of the bridge axis. A third step of transferring the crane mechanism forming a part to the movable carriage with the pair of bridge girder members suspended, and the movable carriage and the crane mechanism on the sliding girder on the tip side The moved, characterized by comprising a fourth step of bridging the girders member of the pair via the crane mechanism on the distal end side of the bridge girder.

  The bridge girder erection method according to claim 9 is a bridge girder erection method in which bridge girder members are sequentially assembled at the tip of a bridge girder that is cantilevered from the bridge girder erected on the upper end of the pier in the bridge axis direction. A sliding girder that can be moved in a cantilevered manner from the bridge girder to the bridge axis, a first step of preparing a crane device that is mounted on the sliding girder and that can move on the sliding girder in the bridge axis direction, and a crane A second step of lifting a pair of bridge girder members outward from both ends in the width direction of the bridge girder and above the lower end of the bridge girder using the apparatus, and the crane apparatus and the sliding girder holding the pair of bridge girder members on the bridge girder. A third step of moving in the direction of the bridge axis, and moving the crane device holding the pair of bridge girder members on the sliding girder to the tip side, Characterized by comprising a fourth step of bridging a pair of girder members on the distal end side of the bridge girder through the lane mechanism.

  According to the bridge girder installation device of claim 1, a crane device comprising a sliding girder, a movable carriage on the sliding girder, a crane apparatus having a separable carriage mechanism and a crane mechanism, and a pair of bridge girder members suspended therein. The bridge girder is moved to a position where it overlaps with one end of the sliding girder's pier side, then the crane mechanism is separated from the carriage mechanism and transferred onto the moving carriage, and the moving carriage moves over the sliding girder. Therefore, even if there are roads, routes, buildings, electric wires (high voltage lines), forests, etc. under the bridge girder to be installed, there is almost no restriction on the construction limit under the bridge girder to be installed. A bridge girder can be installed on the bridge girder. In particular, a pair of bridge girder members is lifted from the ground outside the both ends in the width direction of the bridge girder by a crane mechanism. When transporting the material in the direction of the bridge axis, it is suspended above the lower end of the bridge girder, for example, a main body member that includes one end portion of the sliding girder on the pier side and movably mounts and supports the movable carriage Since it can be held at the bridge shaft transport position at the same height and outside the both ends in the width direction of the main body member, the bridge girder member can be lifted from the ground and bridge axis direction by one set of crane equipment The equipment cost can be reduced, and the center of gravity of the bridge girder can be lowered along with the crane device and sliding girder in the direction of the bridge axis, and the sliding girder structure can be strengthened and rigid. It can be secured enough to realize stable conveyance of the bridge girder member in the direction of the bridge axis, and it can be expected that the work of installing the bridge girder is efficient.

  According to the bridge girder erection device of claim 2, the crane mechanism of the crane apparatus is configured to suspend and support the pair of bridge girder members including the sliding girder one end portion on the pier side and movable. It can be transported in the direction of the bridge axis by the carriage mechanism of the crane device and the moving carriage on the sliding girder while being held at the same position as the main body member and outside the both ends in the width direction of the main body member. Therefore, after a pair of bridge girder members are lifted from the ground by the crane mechanism and held at the bridge shaft transport position, a pair of bridge girder members are held at the bridge shaft transport position, Carrying the bridge girder member to the bridge girder tip side, transferring the crane mechanism from the carriage mechanism to the moving carriage, and carrying a pair of bridge girder members to the bridge girder tip side by the moving carriage on the sliding girder. Therefore, the structure of the sliding girder can secure enough strength and rigidity, and the crane device can be surely wrapped with the one end part of the pier side of the sliding girder. Therefore, the bridge girder member together with the crane device and the sliding girder. The center of gravity of the bridge girder can be reliably lowered and the bridge girder member can be stably conveyed.

  According to the bridge girder erection apparatus of claim 3, since the cart mechanism of the crane apparatus has the bridge girder member mounting portion for mounting the pair of bridge girder members at the bridge shaft transport position, in particular, the pair of bridge girder members. When the trolley mechanism is transported to the front end side of the bridge girder, stable conveyance of the bridge girder member can be realized with certainty.

  According to the bridge girder erection apparatus of claim 4, the crane mechanism of the crane apparatus has the width direction moving means for moving the pair of suspended bridge girder members in the width direction of the bridge girder. When the members are lifted, the pair of girder members can be sufficiently spaced so that the pair of bridge girder members do not come into contact with the bridge girder. Even after the pair of bridge girder members are transferred to the outside of the bridge girder tip, the distance between the bridge girder members can be adjusted and smoothly assembled to the bridge girder tip.

  According to the bridge girder installation device of claim 5, the carriage mechanism of the crane apparatus has a traveling table having a plurality of traveling wheels and a plurality of pairs of leg members standing on the traveling table, and the crane of the crane apparatus. The mechanism has a base member, and the pier side one end portion of the sliding girder can be relatively inserted between a plurality of pairs of leg members together with the movable carriage disposed thereon and below the base member of the crane mechanism. Since it is configured to be insertable, the crane device can be reliably wrapped with the pier side one end portion of the sliding girder in a state where the base member of the crane mechanism is placed and supported on a plurality of pairs of leg members of the cart mechanism, The mechanism can be separated from the cart mechanism and reliably transferred onto the moving cart. Moreover, the bridge girder mounting part which mounts a pair of bridge girder member of the said bridge shaft conveyance position can be provided in the traveling stand of a trolley | bogie mechanism.

  According to the bridge girder installation device of claim 6, the plurality of pairs of leg members of the carriage mechanism are each provided with a hydraulic jack for pushing up the crane mechanism and a spacer that can be removed while the crane mechanism is pushed up. By removing the spacers from the pair of leg members, the crane mechanism is configured to be transferred from the carriage mechanism onto the movable carriage. Therefore, these leg members are mounted in a state where the spacers are attached to the plural pairs of leg members of the carriage mechanism. Can be supported in a stable state at a height position where the crane device can be wrapped with one end portion of the sliding girder on the pier side, and after the crane device is wrapped with one end portion on the pier side of the sliding girder, The crane mechanism can be separated from the carriage mechanism and can be easily and reliably transferred onto the moving carriage.

  According to the bridge girder installation device of claim 7, after separating the crane mechanism from the carriage mechanism, one end portion of the sliding girder on the pier side is connected to the bridge girder via the carriage mechanism and functions as a counterweight. It is possible to reliably prevent the sliding girder from being tilted when the movable carriage supporting the pair of bridge girders moves to the bridge girder tip side.

  According to the bridge girder construction method of claim 8, in the first step, the sliding girder which is movable in the bridge axis direction on the bridge girder and is cantilevered from the bridge girder to the bridge axis direction, and the sliding girder on the sliding girder. In the second step, a pair of bridge girder members are lifted to the outside of both ends of the bridge girder in the width direction and above the lower end of the bridge girder in the second step. The crane apparatus carrying the bridge girder member is moved in the direction of the bridge axis on the bridge girder, and the crane mechanism forming a part of the crane apparatus is transferred to the movable carriage with the pair of bridge girder members suspended. In this step, the movable carriage and the crane mechanism are moved on the sliding girder to the distal end side, and the pair of bridge girder members are installed on the distal end side of the bridge girder via the crane mechanism. The same effects.

  According to the bridge girder erection method of claim 9, in the first step, the sliding girder is movable on the bridge girder and can be cantilevered from the bridge girder in the bridge axis direction. To prepare a crane device that can move in the direction of the bridge axis on the sliding girder, and in the second step, the crane device is used to lift a pair of bridge girder members to the outside of both ends of the bridge girder in the width direction and above the lower end of the bridge girder, In the third step, the crane device and the sliding girder, each holding a pair of bridge girder members, are moved in the direction of the bridge axis on the bridge girder. In the fourth step, the crane device, which carries a pair of bridge girder members, is a sliding girder. Since the top is moved to the tip side and a pair of bridge girder members is installed on the tip side of the bridge girder via the crane mechanism, the effects and basics of claim 8 The same effect is produced, but as a different effect, a crane device having a carriage mechanism is not required, so that the preparation load in the first step can be reduced, the equipment cost can be reduced, and the crane mechanism is changed from the carriage mechanism to the moving carriage. Since it is not necessary to transfer, the process of conveying a pair of bridge beams in the bridge axis direction in the third and fourth processes can be simplified.

  The bridge girder erection device of the present invention includes a sliding girder mounted on a bridge girder so as to be movable along the bridge girder, a movable carriage equipped on the sliding girder so as to be movable in the bridge axis direction, and a pair of bridge girder members. Equipped with a crane device that can be transported in the vertical direction and the bridge axis direction outside both ends in the width direction. The crane device is mounted on a carriage mechanism that can move along the bridge girder along the bridge girder, and is connected so that the connection can be released. The crane device having a crane mechanism having a pair of bridge girder members is moved to a position where it wraps on the bridge girder one end portion of the sliding girder on the bridge girder, and then the crane mechanism is separated from the cart mechanism. It is configured to be transferred onto a moving carriage and moved on the sliding girder by the moving carriage.

  In the bridge girder construction method of the present invention, in the first step, the sliding girder can be moved in the bridge axis direction on the bridge girder and cantilevered from the bridge girder to the bridge axis direction, and can be moved in the bridge axis direction on the sliding girder. In the second step, a pair of bridge girder members are lifted to the outside of both ends of the bridge girder in the width direction and above the lower end of the bridge girder using the crane device. In the third step, the pair of bridge girder members are lifted. The suspended crane device is moved on the bridge girder in the direction of the bridge axis, and the crane mechanism that forms part of the crane device is transferred to the movable carriage with a pair of bridge girder members suspended, and moved in the fourth step. The carriage and the crane mechanism are moved on the sliding girder to the front end side, and a pair of bridge girder members are installed on the front end side of the bridge girder via the crane mechanism.

  The bridge girder erection device and the bridge girder erection method of the present invention will be described with reference to the drawings. In addition, the bridge axis direction of the bridge girder will be described as the front-rear direction, the front end side of the bridge girder as the front side, the opposite side (bridge pier side) as the rear side, and the width direction of the bridge girder as the left-right direction.

First, the bridge girder installation device 1 will be described.
As shown in FIGS. 1 to 7, the bridge girder erection device 1 includes a pair of bridge girder members at the end of a bridge girder 3 that is cantilevered from the bridge girder 3 erected on the upper end of the pier 2 in the direction of the bridge axis. This is a device for sequentially assembling a plurality of sets of a main digit 4 made up of a certain I digit and a horizontal beam 5 made up of one I digit.

  The pair of main girders 4 is assembled so as to extend forward from the two existing main girders C4 of the bridge girder 3, and the horizontal girder 5 is assembled so as to connect the pair of main girders 4 in the left-right direction. A pair of main girder 4 and one horizontal girder 5 constitute one bridge girder block 6, and this bridge girder block 6 is sequentially assembled at the tip of the bridge girder 3, and the bridge girder 3 is installed and extended.

  In the bridge girder installation device 1, a pair of main girders 4 and one horizontal girder 5 are each lifted from the ground as a single material and conveyed forward to the outside of the end of the bridge girder 3. A bridge girder block 6 is constructed by connecting one horizontal girder 5, and then the bridge girder block 6 is assembled to the tip of the bridge girder 3. It is also possible to construct the bridge girder block 6 by connecting the pair of main girders 4 and one horizontal girder 5 after or after assembling the pair of main girders 4 to the tip of the bridge girder 3. .

  The bridge girder installation device 1 includes a sliding girder 10 that is mounted on the bridge girder 3 so as to be movable along the bridge girder 3 in the bridge axis direction, and a movable carriage 11 that is mounted on the sliding girder 10 so as to be movable in the bridge axis direction. A pair of main girders 4 can be conveyed in the vertical direction and the bridge axis direction outside the both ends of the bridge girder 3 in the width direction, and one horizontal girder 5 can be conveyed in the vertical direction, the bridge axis direction, and the bridge axis orthogonal direction. And a crane device 12.

  The crane device 12 includes a carriage mechanism 13 that can move on the bridge girder 3 along the bridge girder 3 in the bridge axis direction, and a crane mechanism 14 that is mounted on the carriage mechanism 13 and is releasably connected. The erection device 1 moves the crane device 12 that holds a pair of main girders 4 and one cross girder 5 to a position where it wraps on the bridge girder 3 with one end portion (rear end portion) on the pier side of the sliding girder 10. After that, the crane mechanism 14 is separated from the carriage mechanism 13 and transferred onto the moving carriage 11, and the moving carriage 11 moves on the sliding girder 10.

  The sliding girder 10, the movable carriage 11, the carriage mechanism 13 and the crane mechanism 14 of the crane apparatus 12 will be described in detail.

(Sliding girder)
As shown in FIGS. 2 and 3, the sliding girder 10 includes a main body member 20, two pairs of wheel devices 21, a propulsion device 22, a cross beam conveying device 23, and the like. The main body member 20 has a longitudinal length that is about twice the longitudinal length of the main girder 4, a vertical length that is shorter than the vertical length of the main girder 4, and a lateral width that is narrower than the interval between the two existing main girders C4. The movable carriage 11 is placed and supported so as to be movable.

  Two carriage traveling rails 24 on which the movable carriage 11 travels are laid on the upper surface side portion of the main body member 20 so as to extend in the front-rear direction over the entire length of the main body member 20. Two carriage guide rails 25 are laid on the inner side of the carriage running rail 24 so as to extend over the entire length of the main body member 20 in the front-rear direction. The cart guide rail 25 has a function of preventing the crane device 12 from being lifted up.

  In the side view, the main body member 20 is formed in a rectangular shape whose rear side is approximately elongated in the front-rear direction, the front half is formed in a tapered shape whose vertical thickness is reduced toward the front side, and the front half is the bridge girder 3. The sliding girder 10 is in a bridge girder installation position in which the next bridge girder 3 can be erected in a state where the girder 10 is cantilevered. Here, the main body member 20 does not need to have a space for conveying the main girder 4 and the horizontal girder 5 inside thereof as in the prior art carry method, and is limited in structure in that respect. Therefore, for example, it can be configured as a beam structure as a whole, and a steel plate can be appropriately attached to the surface side portion so as to have a low center of gravity and high strength and rigidity.

  Two front and rear wheel mounting members 26 extending in the left-right direction are fixed to a lower end portion of the main body member 20 at a center portion in the front-rear direction and an intermediate portion between the center portion in the front-rear direction and the rear end portion. The mounting members 26 have a longer left and right length than the distance between the two existing main girders C4, and these wheel mounting members 26 are equipped with two pairs of wheel devices 21.

  Here, on the upper end flange C4a of the two existing main girders C4, the two traveling rails 7 on which the carriage mechanism 13 of the sliding girder 10 and the crane device 12 travels extend over the entire length of the bridge girder 3. It is laid so as to extend in the axial direction.

  Each wheel device 21 is fixed to a wheel mounting member 26 and positioned above the existing main girder C4, and a pair of traveling wheels 21b mounted on the wheel carriage 21a so as to be rotatable about a horizontal axis. And a side stopper 21c fixed to the main body member 20 and positioned inside the upper end flange C4a of the existing main beam C4, and a guide wheel 21d mounted on the side stopper 21c so as to be rotatable about the vertical axis. The traveling wheel 21b rolls on the traveling rail 7, and the guide wheel 21d is engaged with the inner end portion of the upper end flange C4a of the existing main beam C4.

  The propulsion device 22 has a pair of left and right propulsion jacks 22a, and the propulsion jacks 22a are connected to the wheel carriage 21a of the pair of wheel devices 21 on the front side so as to be rotatable and extend rearward. The rear end portion is connected to the upper end flange C4a of the two existing main girders C4 via the clamp mechanism 22b so that the connection can be released. Each propulsion jack 22a contracts and is driven to extend from a state where it is connected to the upper end flange C4a of the existing main girder C4, the sliding girder 10 propels forward, and then each propulsion jack 22a is moved to the existing main girder C4. After being disconnected from the upper end flange C4a, it is driven to contract and is connected again to the upper end flange C4a, and the above operation is repeated to propel the sliding girder 10.

  The cross beam conveyor 23 transfers the cross beam 5 from the position of the rear end portion of the sliding girder 10 to the outside of the front end of the bridge beam 3 with the cross beam 5 directed in the front-rear direction. The cross beam 5 is conveyed so as to face the direction. The cross beam conveying device 23 includes a pair of left and right vertical trolley devices 27 and a horizontal trolley device 28.

  Each vertical trolley device 27 includes a vertical trolley rail 27 a extending in the front-rear direction, and the vertical trolley rail 27 a of the pair of vertical trolley devices 27 is formed at the upper end portion of the main body member 20 with the width of the pair of carriage traveling rails 24. It is attached in a drooping manner on the outer side. The pair of vertical trolley rails 27 a are arranged so that the front end portion of the main body member 20 protrudes to the front side of the main body member 20 over the entire length of the main body member 20.

  Each vertical trolley device 27 includes a pair of pulleys 27b attached to both front and rear ends of the vertical trolley rail 27a, and a wire 27c wound around the pair of pulleys 27b, as shown in FIG. A trolley 27d with a pair of suspension wires, which are arranged at regular intervals and are movably supported by the vertical trolley rail 27a and connected to a part of the wire 27c and can suspend the cross beam 5, and a wire 27c. And a driving machine for driving.

  As shown in FIG. 15-2 and the like, the horizontal trolley device 28 has a horizontal trolley rail 28a extending in the left-right direction, and both left and right ends of the horizontal trolley rail 28a are connected to the front ends of a pair of vertical trolley rails 27a. Has been. Similar to the vertical trolley rail 27, the horizontal trolley device 28 includes a pair of pulleys 28b, wires 28c, a trolley 28d with a suspension wire, and a driving machine. However, there is one trolley 28d.

(Mobile cart)
As shown in FIGS. 2 and 3, the movable carriage 11 includes a carriage member 30, two pairs of wheel devices 31, a propulsion device 32, and the like. The cart member 30 has, for example, a longitudinal length that is about 1/5 of the longitudinal length of the sliding girder 10 and a lateral width that is substantially the same as the lateral width of the main body member 20 of the sliding girder 10. It arrange | positions along the upper surface side part of the girder 10, and mounts and supports the crane mechanism 14 of the crane apparatus 12. FIG.

  Two pairs of wheel devices 31 are mounted on the left and right end portions of the front and rear of the carriage member 30, and each wheel device 31 is fixed to the carriage member 31 and is located on the upper side of the carriage travel rail 24 on the sliding girder 10. And a pair of traveling wheels 31b mounted on the wheel carriage 31a so as to be rotatable about a horizontal axis, and the traveling wheels 31b roll on the carriage traveling rail 24.

  Each wheel device 31 is fixed to the carriage member 30 so as to hang down. The wheel attachment member 31c is located above the carriage guide rail 25 on the sliding girder 10, and the wheel attachment member 31c is rotatable about the horizontal axis. One or a plurality of pairs of guide wheels 31d are mounted, and the guide wheels 31c are engaged with the carriage guide rail 25 in a sandwiched manner from both inside and outside.

  The propulsion device 32 is, for example, installed in at least one pair of wheel devices 31 of the two pairs of wheel devices 31, and is configured to propel the mobile carriage 11 in the front-rear direction by rotationally driving the traveling wheels 31b. Has been.

(Crane mechanism of crane device)
As shown in FIGS. 4 to 7, the cart mechanism 13 of the crane device 12 includes a cart body 40, two pairs of wheel devices 43, a clamp device 44, a transfer device 45, and the like. The carriage main body 40 has a longitudinal length substantially the same as the longitudinal length of the mobile carriage 11, and a traveling base 41 having a plurality of traveling wheels 43 a and a pair of left and right erected on the traveling base 41, a total of two pairs in the front and rear. It has four leg members 42 and mounts and supports the crane mechanism 14 of the crane device 12.

  The traveling platform 41 has a lateral width wider than the interval between the two existing main girders C4, and the two pairs of leg members 42 have a vertical length longer than the vertical length of the main girders 4, and a sliding girder The main body member 20 and the movable carriage 11 are arranged so as to be positioned above the existing two main girders C4 with an interval wider than the left and right widths. On these leg members 42, the base member 50 of the crane mechanism 14 is placed and supported. A plurality of reinforcing members 46 are provided on the left and right side portions of the cart mechanism 13, and a plurality of reinforcing members 47 a to 47 c are provided on the front and rear side portions.

  Here, at each side portion of the front and rear sides of the carriage mechanism 13, the reinforcement switching mechanism 47 causes the plurality of reinforcement members 47 a to 47 c to retreat from the reinforcement position (see FIG. 5) used for reinforcement and from the reinforcement position. The position is switched over to a retracted position (see FIGS. 6 and 7) that opens widely between the pair of left and right leg members 42. When the plurality of reinforcing members 47a to 47c are in the reinforcing position, the base member 50 of the crane mechanism 14 placed and supported on the leg member 42 is connected to the leg member 42 via the reinforcing members 47a to 47c.

  Two pairs of reinforcement switching mechanisms 47 are provided corresponding to the two pairs of leg members 42. In each of the reinforcement member switching mechanisms 47, as a plurality of reinforcement members 47a to 47c, an extension jack 47a and two link members 47b, 47c. And a base end portion of the telescopic jack 47a is rotatably connected to a lower end portion of the leg member 42, and a distal end portion of the link member 47b is rotatably connected to a distal end portion of the telescopic jack 47a. The base end portion of the link member 47b is rotatably connected to a substantially central portion between the pair of left and right leg members 42 among the 14 base members 50.

  The length of the telescopic jack 47a is adjusted so that the distal end of the telescopic jack 47a and the distal end of the link member 47c are pivotally connected, and the telescopic jack 47a and the link member 47b are substantially aligned. The base end portion is connected to the middle portion of the leg member 42 in the length direction, and the plurality of reinforcing members 47a to 47c become the reinforcing positions. From this state, the connection between the telescopic jack 47a and the link member 47b is released, and the link member 47b is rotated and held in a horizontal posture at the same height as the base member 50 of the crane mechanism 14, and the telescopic jack 47a The link member 47c is rotated and held in an upright posture in the vicinity of the leg member 42, and the plurality of reinforcing members 47a to 47c are in the retracted position.

  Here, the cart mechanism 13 has a pair of bridge girder member placement portions 41a for placing a pair of main girders 4 at bridge shaft transport positions described later. These bridge girder member placement portions 41 a are provided in a portion of the traveling platform 41 that projects outward in the width direction from the leg member 42.

  Two pairs of wheel devices 43 are provided at the left and right ends of the front and rear of the traveling table 41, and each wheel device 43 is fixed to the traveling table 41 and is located above the existing main girder C4. The wheel carriage 43a has a pair of running wheels 43b that are rotatably mounted around the horizontal axis, and the running wheels 43b roll on the running rail 7.

  Each wheel device 43 is fixed to the traveling platform 41 so as to be suspended, and is provided with a side stopper 43c positioned on the inner side of the upper end flange C4a of the existing main beam C4, and the side stopper 43c is rotatable about a vertical axis. The guide wheel 43d is engaged with the inner end portion of the upper end flange C4a of the existing main beam C4.

  At least one pair of wheel devices 43 of the two pairs of wheel devices 43 includes a self-propelled wheel device 43, and the traveling wheel 43b is rotationally driven by the self-propelled wheel device 43 to roll the upper end flange C4a of the existing main beam C4. The driving force is generated by moving.

  The transfer device 45 transfers the crane mechanism 14 from one of the carriage mechanism 13 and the movable carriage 11 to the other. The transfer device 45 is provided on each of the two pairs of leg members 42 and is in a state where the crane mechanism 14 is pushed up by the hydraulic jacks 45a for pushing up the crane mechanism 14 and on each of the two pairs of leg members 42. The detachable spacer 45b is removed, and the crane mechanism 14 is transferred from the carriage mechanism 13 onto the movable carriage 11 by removing the spacers 45b from the two pairs of leg members 42, respectively.

  Each leg member 42 includes a first leg portion 42a and a second leg portion 42b. The first leg portion 42a is fixed to the traveling base 41, and a hydraulic cylinder 45a is directed upward at the upper end portion of the first leg portion 42a. The second leg 42b is fixed to the rod of the hydraulic cylinder 45a, and the spacer 45b is removably inserted between the first and second legs 42a and 42b so as not to interfere with the rod of the hydraulic cylinder 45a. The first leg portion 42a and the second leg portion 42b are firmly attached to each other.

  With the spacers 45b mounted on the two pairs of leg members 42, the lower ends of the base members 50 of the crane mechanism 14 mounted and supported on the leg members 42 become higher than the movable carriage 11 on the sliding girder 10. In addition, as described above, the distance between the two pairs of leg members 42 is wider than the left and right widths of the main body member 20 and the movable carriage 11 of the sliding girder 10, and a plurality of reinforcing members 47 a to 47 are formed by the reinforcing switching mechanism 47. In a state where 47c is switched from the reinforced position to the retracted position, two pairs of legs are relatively provided in order to wrap the one end portion of the sliding girder 10 on the pier side together with the moving carriage 11 disposed thereon on the crane device 12. It can be inserted between the members 42 and can be inserted below the base member 50 of the crane mechanism 14.

  The hydraulic jack 45a is extended so that the space between the first and second leg portions 42a and 42b can be widened and the spacer 45b can be removed. Thereafter, the hydraulic jack 45a is contracted and the second leg portion 42b is lowered. Thus, when one end portion of the sliding girder 10 on the pier side is not wrapped with the crane device 12, when the second leg portion 42 b is lowered until it comes into contact with the first leg portion 42 a, it becomes lower than the upper end of the movable carriage 11. When the pier side one end portion of the sliding girder 10 is wrapped by the crane device 12, the crane mechanism 14 placed and supported on the two pairs of leg members 42 is transferred to the movable carriage 11.

(Crane mechanism of crane equipment)
As shown in FIGS. 4 to 7, the crane mechanism 14 includes a base member 50, two pairs of main girder lifting devices 51, a main girder width direction moving mechanism 52, a lifting device 53, a cross beam width direction moving mechanism 54, and the like. Has been. The base member 50 has substantially the same longitudinal length as the longitudinal length of the carriage mechanism 13, and has a larger distance between the existing two main girders C <b> 4 and a lateral width larger than that of the carriage mechanism 13.

  The two pairs of main girder lifting devices 51 are provided in the form of two pairs on the left and right with one pair in the front and rear, and one main girder 4 is lifted by each pair of main girder lifting devices 51. Each main girder lifting device 51 includes a support case 51a supported by the base member 50, a wire, a winch 51b attached to the support case 51a, and a plurality of pulleys 51c on which the wire is hung.

  The main girder width direction moving mechanism 52 moves the two pairs of main girder lifting devices 51 in the left-right direction, so that the pair of main girder 4 suspended by the two pairs of main girder lifting devices 51 is moved in the width direction of the bridge girder 3. There are two pairs corresponding to the two pairs of main girder lifting devices 51.

  Each main girder width direction moving mechanism 52 includes a carriage 52a to which a support case 51a of the main girder lifting device 51 is attached, a rail 52b that is attached to the base member 50 and supports the carriage 52a so as to be movable in the left-right direction, A plurality of pulleys 52c mounted on both sides of 52b, a wire 52d wound around these pulleys 52c, and a wire driving device 52e for driving the wire 52d. A part of the wire 52d is connected to the carriage 52a. Yes.

  Thus, the crane mechanism 14 has the two pairs of main girder lifting devices 51 and the main girder width direction moving mechanism 52, so that the suspended pair of main girders 4 can be connected to one end of the sliding girder 10 on the pier side. Is held at the bridge shaft conveyance position located at the same height position as the main body member 20 and outside the both ends in the width direction of the main body member 20, and the carriage mechanism 13 of the crane device 12 and the movable carriage 11 on the sliding girder 10. In particular, when the crane mechanism 14 is located on the carriage mechanism 13, the pair of main girders 4 at the bridge axis conveyance position is replaced with the pair of bridge girders of the carriage mechanism 13. It is comprised so that it can mount in the member mounting part 41a.

  The lifting device 53 is installed in the central portion of the base member 50, and the horizontal girder 5 is lifted by the lifting device 53. The lifting device 53 includes a support case 53a supported by the base member 50, a wire, a hoist 53b attached to the support case 53a, and the like.

  The cross girder width direction moving mechanism 54 moves the cross girder 5 suspended by the lifting device 53 in the width direction of the bridge girder 3 on the upper side of the traveling platform 41 of the carriage mechanism 13, and includes a horizontal trolley device 55. ing. The horizontal trolley device 55 is attached to the base member 50 and extends in the left-right direction, and a trolley 55b with a suspension wire supported by the horizontal trolley rail 55a so as to be able to suspend the horizontal girder 5 The trolley 55b is driven in the left-right direction.

Next, the bridge girder construction method will be described.
This bridge girder erection method uses the above-mentioned bridge girder erection device 1 to form a pair of bridge girder members at the end of the bridge girder 3 that is cantilevered from the bridge girder 3 erected on the upper end of the pier 2 in the direction of the bridge axis. This is a method of assembling a plurality of sets of a main girder 4, one cross girder 5, and (bridge girder block 6).

  First, in the first step, as shown in FIG. 1, two traveling rails 7, a sliding girder 10, a movable carriage 11, and a crane device 12 are prepared on the bridge girder 3. These preparations are performed in a state where a bridge girder 3 on which two traveling rails 7, a sliding girder 10, and a crane device 12 can be placed is installed on the upper end of the pier 2 before that.

  Further, in this first step, as shown in FIG. 8, the sliding girder 10 is moved to the bridge girder erection position where the front side portion projects from the bridge girder 3 in the cantilever direction (forward) in the direction of the bridge axis (forward). Is made to stand by at the conveyance start position at one end portion of the pier side of the sliding girder 10. In addition, as shown in FIG. 5, the crane mechanism 14 is placed and supported on the leg members 42 in a state where the spacers 45 b are respectively attached to the two pairs of leg members 42 of the carriage mechanism 13, and a plurality of reinforcement switching mechanisms 47 are used. The trolley mechanism 13 and the crane mechanism 14 are connected to each other with the reinforcing members 47a to 47c in the reinforced position, and the crane device 12 is placed at a predetermined lifting position on the pier 2 side of the sliding girder 10 (for example, as shown in FIG. 1). It is located at the position near the pier 2). The main girder 4 and the horizontal girder 5 are conveyed by a truck or the like to the ground portion below the lifting position.

  Next, in the second step, as shown in FIGS. 9 and 10, the pair of main girders 4 is moved back and forth by the two pairs of main girder lifting devices 51 using the crane mechanism 14 of the crane device 12 in the suspended position. The horizontal girder 3 is lifted outward from both ends in the width direction of the bridge girder 3 and above the lower end of the bridge girder 3, and one horizontal girder 5 is lifted above the lower end of the bridge girder 3 by the lifting device 53.

  Here, when the pair of main girders 4 is lifted, the main girder width direction is set so that the pair of main girders 4 does not interfere with the existing two main girders C4 and the carriage mechanism 13 (particularly, the traveling platform 41). The moving mechanism 52 moves the two pairs of main girder lifting devices 51 in the left-right direction so as to adjust the position of the pair of main girders 4 in the lifting width direction. Lift up to a slightly higher position.

  Thereafter, the main girder width direction moving mechanism 52 moves the two pairs of main girder lifting devices 51 inward in the width direction so that a pair of bridge girder member mounting portions of the traveling platform 41 below the pair of main girder 4. 41a is positioned, a pair of main girder 4 is slightly lowered by two pairs of main girder lifting devices 51, and is placed and supported on a pair of bridge girder member mounting portions 41a. Hold at the bridge axis transport position.

  In the lifting device 53, as shown in FIGS. 4 to 6, the cross beam 5 is lifted in an oblique direction that is turned about 45 degrees horizontally from the front-rear direction. Here, the traveling base 41 of the carriage mechanism 13 is formed in a rectangular frame shape, and the two main girders C4 that are already installed so that the horizontal girder 5 does not interfere with the two existing main girders C4 and the carriage mechanism 13. And is passed through the opening of the traveling table 41 and lifted up to the upper side of the traveling table 41.

  Thereafter, the state in which the cross beam 5 is directed in the front-rear direction is shifted from the state of being suspended by the lifting device 53 to the state of being suspended by the trolley 55b with a suspension wire of the lateral trolley device 55 of the lateral beam width direction moving mechanism 54. Thus, the horizontal trolley device 55 moves the horizontal beam 5 to the left or right side to near the inside of the leg member 42, lowers it, and places it on the traveling table 41 to hold and hold it. Here, before moving the cross beam 5 to the left and right to near the inside of the leg member 42, the plurality of reinforcing members 47a to 47c are switched from the reinforcing position to the retracted position by the reinforcing switching mechanism 47 as shown in FIG. Thus, the space between the pair of left and right leg members 42 is wide open.

  Next, in the third step, as shown in FIG. 11, the crane apparatus 12 that suspends a pair of main girders 4 and one cross girder 5 is bridged on the bridge girder 3 by the carriage mechanism 13 in the bridge axis direction (front). The crane mechanism 14 forming a part of the crane device 12 is transferred to the moving carriage 11 at the transfer start position with the pair of main girders 4 and one cross girder 5 being suspended. When the crane mechanism 14 is transferred from the cart mechanism 13 to the moving cart 11, the crane device 12 is moved to a transfer position where the crane device 12 is overlapped with one end portion of the sliding girder 10 and then the transfer device 45 is operated.

  Here, before the crane apparatus 12 is wrapped with the one end portion of the sliding girder 10 on the pier side, as shown in FIG. 7, a plurality of reinforcing members 47 a to 47 c are retracted from the reinforcing position by the reinforcing switching mechanism 47. Since the crane device 12 is moved to the transfer device after widely opening the pair of left and right leg members 42, the one end portion on the pier side of the sliding girder 10 is moved together with the movable carriage 11 disposed thereon. Relatively, it is inserted between the two pairs of leg members 42 and below the base member 50 of the crane mechanism 14 so as to wrap with the crane device 12.

  In this state, the transfer device 45 is operated, the hydraulic jack 45a is extended and driven in each leg member 42, the second leg part 42b is raised, and the distance between the first and second leg parts 42a, 42b. Is widened, the spacer 45b is removed, and then the hydraulic jack 45a is driven to contract and the second leg portion 42b is lowered, so that the second leg portion 42b becomes lower than the upper end of the movable carriage 11, The crane mechanism 14 is transferred from the carriage mechanism 13 to the movable carriage 11.

  Here, for the cross beam 5, a trolley 27 d with a pair of suspension wires of one vertical trolley device 27 of the cross beam conveying device 23 of the sliding girder 10 from a state of being suspended by the cross beam width direction moving mechanism 54. Transition to the state of being suspended.

  Next, in a 4th process, as shown in FIGS. 12-14, the moving trolley 11 and the crane mechanism 14 of a conveyance start position are moved on the sliding girder 10 to the front end side, and the moving trolley 11 is made into the sliding girder 10. The pair of main girders 4 is conveyed to the outside of the end of the bridge girder 3 by moving it to the conveyance end position of the one end portion of the front end side, and the pair of main girders 4 is moved to the front end side of the bridge girder 3 via the crane mechanism 14. Erection. In addition, the vertical girder device 27 and the horizontal trolley device 28 of the sliding girder 10 transport one horizontal girder 5 to the tip side of the sliding girder 10 to the outside of the front end of the bridge girder 3, and then turn it 90 degrees horizontally. The horizontal beams 5 are assembled by connecting the left and right ends of 5 to the inner side surfaces of the pair of main beams 4.

  Regarding the conveyance of the cross beam 5, specifically, as shown in FIGS. 15-1 and 2, first, the horizontal beam 5 is moved forward by one vertical trolley device 27 and moved to the maximum extent. The front portion of the cross beam 5 is suspended on the trolley 28d of the horizontal trolley device 28, and then removed from the trolley 27d on the front side of one vertical trolley device 28. Here, the front trolley 27d is disconnected from the wire 27c and moved to a retracted position that does not get in the way.

  Next, as shown in FIGS. 16-1, 2 and 17-1, 2, the rear portion of the cross beam 5 is moved forward by one vertical trolley device 27, and the horizontal trolley device 28 By moving the front side portion of the beam 5 toward the other vertical trolley device 27, the horizontal beam 5 is turned 90 degrees horizontally and turned in the left-right direction, and then the front portion of the horizontal beam 5 is moved to the other vertical trolley. The trolley 27d of the device 27 is suspended.

  Thereafter, as shown in FIGS. 18-1 and 18-2, the cross beam 5 is raised or the pair of main girders 4 is lowered so that the left and right ends of the cross beam 5 are connected to the pair of cross beam connecting members 5a. The bridge beam 6 is constructed by connecting the beam 5 to the pair of main beams 4 through these beam connection members 5a, and then, as shown in FIGS. 19 and 20, two pairs of main beams The pair of main girder 4 and the horizontal girder 5 (bridge girder block 6) are lowered by the girder lifting device 51, and the pair of main girder 4 is assembled to the two existing main girder C4.

  Here, after the crane mechanism 14 is separated from the cart mechanism 13, after the movable cart 11 moves forward, the two pairs of leg members 42 of the cart mechanism 13 and the main body member 20 of the sliding girder 10 are coupled by the coupling member 13a. Then, one end portion of the sliding girder 10 on the pier side is connected to the bridge girder 3 via the carriage mechanism 13 so that the carriage mechanism 13 functions as a counterweight.

  Next, in the fifth step, in order to construct the next bridge girder 3, the crane mechanism 14 and the movable carriage 11 are moved to the transfer start position, and the crane mechanism 14 is transferred from the movable carriage 11 to the carriage mechanism 13. The crane device 12 at the transfer position is moved to the lifting position, and at that time, the reinforcement switching mechanism 47 switches the plurality of reinforcement members 47a to 47c from the retracted position to the reinforcement position, and the two traveling rails 7 After extending and laying on a pair of main girders 4 installed, as shown in FIG. 8, a sliding girder 10 is installed in a bridge girder whose front side portion is cantilevered from the bridge girder 3 toward the bridge axis. Then, the second to fifth steps are repeated, and a plurality of pairs of main girder 4 and one cross girder 5 (bridge girder block 6) are sequentially assembled.

The bridge girder erection device 1 and the bridge girder erection method described above have the following remarkable effects.
After moving the crane apparatus 12 carrying a pair of main girders 4 to a position where the crane girder 3 is overlapped with one end portion of the sliding girder 10 on the pier side, the crane mechanism 14 is separated from the cart mechanism 13 to move the cart. 11 and moved on the sliding girder 10 by the moving carriage 11, roads, routes, buildings, electric wires (high-voltage lines), forests, etc. are located below the bridge girder 3 to be installed. Even if it exists, the bridge girder 3 can be installed with almost no restrictions on the construction limit under the bridge girder 3 to be installed.

  In particular, when the pair of main girders 4 are lifted from the ground outside the both ends in the width direction of the bridge girder 3 by the crane mechanism 14 and then transported in the direction of the bridge axis, the pair of main girders 4 is above the lower end of the bridge girder 3. Specifically, the main body member 20 includes the one end portion on the pier side of the sliding girder 10 and is at the same height as the main body member 20 for movably mounting and supporting the movable carriage 11. Can be held at the bridge shaft transport position located outside the both ends in the width direction.

  That is, one set of crane equipment (that is, the crane mechanism 14) enables the main girder 4 to be lifted from the ground and transported in the direction of the bridge axis, thereby reducing the equipment cost. Furthermore, the crane device 12 and the sliding girder can be reduced. 10 to lower the center of gravity when the main girder 4 is transported in the direction of the bridge axis. Furthermore, the structure of the sliding girder 10 has sufficient strength and rigidity to stabilize the main girder 4 in the direction of the bridge axis. Can be realized, and it can be expected that the work of installing the bridge girder 3 is efficient.

  Here, the crane mechanism 14 is configured so that the pair of main girders 4 that are suspended are held at the bridge shaft transport position and can be transported in the direction of the bridge shaft by the carriage mechanism 13 and the movable carriage 11. After the pair of main girders 4 is lifted from the ground and held at the bridge shaft transport position, the pair of main girders 4 by the carriage mechanism 13 is held with the pair of main girders 4 held at the bridge shaft transport position. 3. Transfer to the distal end side, transfer of the crane mechanism 14 from the carriage mechanism 13 to the movable carriage 11, and conveyance of the pair of main girders 4 to the distal end of the bridge girder 3 by the movable carriage 11, can be performed. The structure of the girder 10 can ensure sufficient strength and rigidity, and the crane device 12 can be reliably wrapped with the pier side one end portion of the sliding girder 10.

  Therefore, the center of gravity 4 can be reliably lowered when the main girder 4 is conveyed in the direction of the bridge axis together with the crane device 12 and the sliding girder 10, and the stable conveyance of the main girder 4 can be realized with certainty. And since the trolley mechanism 13 has the bridge girder member mounting part 41a which mounts a pair of main girder 4 of a bridge axis conveyance position, especially a pair of main girder 4 is made to the bridge girder 3 tip side by the trolley mechanism 13. When carrying, stable conveyance of the main beam 4 can be realized with certainty.

  Since the crane mechanism 14 has the main girder width direction moving mechanism 52 that moves the suspended pair of main girders 4 in the width direction of the bridge girder 3, when the pair of main girders 4 are lifted by the crane mechanism 14, The main girder 4 of the pair can be sufficiently spaced so that the main girder 4 does not contact the bridge girder 3, and then the pair of main girder 4 is securely held at an appropriate bridge shaft transport position. Even after the pair of main girders 4 are transported outside the end of the bridge girder 3, the distance between the main girders 4 can be adjusted and smoothly assembled to the end of the bridge girder 3.

  The cart mechanism 13 includes a traveling table 41 having a plurality of traveling wheels 43b, and two pairs of leg members 42 erected on the traveling table 41. The crane mechanism 14 includes a table member 50, and the sliding girder 10 The one end portion of the pier side can be inserted between the pair of leg members 42 together with the movable carriage 11 disposed thereon, and can be inserted below the base member 50 of the crane mechanism 14. In the state where the base member 50 of the crane mechanism 14 is placed and supported on the two pairs of leg members 42 of the carriage mechanism 13, the crane device 14 can be reliably wrapped with the one end portion on the pier side of the sliding girder 10. The mechanism 14 can be separated from the carriage mechanism 13 and reliably transferred onto the movable carriage 11. In addition, a bridge girder member placement portion 41 a for placing the pair of main girders 4 at the bridge shaft conveyance position can be provided on the traveling platform 41 of the carriage mechanism 13.

  The two pairs of leg members 42 of the carriage mechanism 13 are each provided with a hydraulic jack 45a for pushing up the crane mechanism 14 and a spacer 45b that can be removed while the crane mechanism 14 is pushed up. Since the crane mechanism 14 is configured to be transferred from the carriage mechanism 13 onto the movable carriage 11 by removing the spacers 45b, the two pairs of leg members 42 of the carriage mechanism 13 are mounted with the spacers 45b. The crane mechanism 14 placed on the leg member 42 can be stably supported at a height position where the crane device 12 can be wrapped with one end portion of the sliding girder 10 on the pier side, and the crane device 12 can be supported on the pier side of the sliding girder 10. After lapping with one end portion, the crane mechanism 14 is separated from the cart mechanism 13 and can be easily placed on the movable cart 11. Indeed it can be transferred.

  After separating the crane mechanism 14 from the carriage mechanism 13, the one end portion of the sliding girder 10 on the pier side is connected to the bridge girder 3 via the carriage mechanism 13 so as to function as a counterweight. It is possible to reliably prevent the sliding girder 10 from being tilted when the movable carriage 11 supporting the girder 4 moves to the bridge girder tip side.

  As shown in FIG. 21, this bridge girder erection device 1A has a pair of main girder at both ends of the bridge girder 3 that is cantilevered from the bridge girder 3 erected on the upper end of the pier 2 to both sides in the direction of the bridge axis. A device for sequentially assembling a plurality of sets of girders 4 and one cross beam 5, and includes the sliding girder 10, the movable carriage 11, the crane apparatus 12, and the sliding girder 10A and the movable carriage 11A of the first embodiment. Yes.

  The sliding girder 10A and the movable carriage 11A have the same structure as the sliding girder 10 and the movable carriage 11, and are arranged symmetrically in the bridge axis direction with respect to the sliding girder 10 and the movable carriage 11, and the crane device 12 is common to both of them. Applies to

  The bridge girder erection method using this bridge girder erection device 1A includes a pair of main girder 4 at both ends of the bridge girder 3 that is cantilevered from the bridge girder 3 erected on the upper end of the pier 2 to both sides in the direction of the bridge axis. This is a construction method in which a plurality of sets of one cross beam 5 and (bridge girder block 6) are alternately assembled. First, in the first step, two traveling rails 7, sliding girders 10, 10A, and a movable carriage 11 are placed on the bridge girder 3. 11A and the crane device 12 are prepared.

  Next, as in the first embodiment, the second to fourth steps are performed using the sliding girder 10, the movable carriage 11, and the crane device 12, and then the crane mechanism 14 and the movable carriage 11 are conveyed in the fifth step. The crane mechanism 14 is transferred from the moving carriage 11 to the carriage mechanism 13 by moving to the start position, the crane apparatus 12 at the transfer position is moved to the lifting position, and then the sliding girder 10A, the moving carriage 11A, The second to fourth steps similar to those described above are performed using the crane device 12, and in the meantime, the two girder rails 7 are extended and laid on the pair of main girders 4, and then the sliding girder 10 is moved to the bridge girder erection position where the front side portion is cantilevered from the bridge girder 3 in the direction of the bridge axis.

  Here, in the third step, when the crane device 12 that holds the pair of main girders 4 and cross beams 5 is moved toward the sliding girder 10A, Since the main girder 4 and the horizontal girder 5 can be held on the upper side of the bridge girder 3, the pair of main girder 4 and horizontal girder 5 can be lifted at the same lifting position in the second step.

  Then, after performing the second to fourth steps using the sliding girder 10A, the movable carriage 11A, and the crane device 12, in the fifth step, the crane mechanism 14 and the movable carriage 11A are moved to the conveyance start position, and the crane The mechanism 14 is transferred from the moving carriage 11 </ b> A to the carriage mechanism 13, the crane apparatus 12 at the transfer position is moved to the lifting position, and then again using the sliding girder 10, the moving carriage 11, and the crane apparatus 12. In the meantime, the second to fourth steps are carried out. In the meantime, after extending and laying on the pair of main girders 4 on which the two traveling rails 7 are laid, the sliding girder 10A is placed on the front girder 3 on the front side. To the bridge girder erection position projecting in a cantilevered direction from the bridge axis.

  According to the bridge girder erection device 1A and the bridge girder construction method, the same effects as in the first embodiment are obtained, but one pair is provided at both ends of the bridge girder 3 that cantilevered from the bridge girder 3 to both sides in the bridge axis direction. When the main girder 4 and one cross girder 5 are sequentially assembled, the crane device 12 can be applied in common, so that the equipment cost can be reduced, and the fifth step and the subsequent second to fourth steps are performed. In the meantime, preparations such as laying two traveling rails 7 and moving the sliding girders 10 and 10A to the bridge girder erection position can be prepared. Since the pair of main girder 4 and horizontal girder 5 can be lifted at the upper position, it is possible to realize a space saving of a necessary ground portion below the bridge girder 3.

  As shown in FIG. 22, this bridge girder installation device 1B includes a sliding girder 10B mounted on the bridge girder 3 so as to be movable along the bridge girder 3, and a sliding girder 10B mounted on the sliding girder 10B in the direction of the bridge axis. And a crane device 12 </ b> B that can move. The sliding girder 10B has a structure in which the main body member 20B is added to the main body member 20 of the first embodiment with the front side portion of the main body member 20 symmetrical to the bridge axis direction and added to the rear side portion. It is configured to be cantilevered to the side.

  The crane apparatus 12B includes a movable carriage 11B and a crane mechanism 14B. The movable carriage 11B travels on the main body member 20B of the sliding girder 10B, and the crane mechanism 14B is mounted and supported on the movable carriage 11B. It is connected to. The movable carriage 11B is equipped with a wheel device 61, a propulsion device 62, and the like. The crane mechanism 14B is basically the same structure as the crane mechanism 14 of the first embodiment.

  The bridge girder erection method using this bridge girder erection device 1B is a pair of main girder at both ends of the bridge girder 3 that is cantilevered from the bridge girder 3 erected on the upper end of the pier 2 to both sides in the direction of the bridge axis. In the first step, two traveling rails 7, a sliding girder 10B and a crane device 12B are prepared on the bridge girder 3 in the first step.

  Next, in the second step, as shown in FIG. 23, the crane device 12B is positioned at the center portion in the front-rear direction of the sliding girder 10B, and the crane device 12B and the sliding girder 10B are positioned at the suspended position near the pier 2. Then, the pair of main girders 4 are lifted outside the both ends in the width direction of the bridge girder 3 and above the lower end of the bridge girder 3 using the crane device 12B. Here, the pair of main girders 4 can be held at the bridge shaft conveyance position located at the same height position as the main body member 20B of the sliding girder 10B and outside the both ends in the width direction of the main body member 20B.

  Next, in the third step, as shown in FIG. 24, the crane apparatus 12 </ b> B and the sliding girder 10 </ b> B that suspends the pair of main girders 4 are moved on the bridge girder 3 in the direction of the bridge axis and toward one end side of the bridge girder 3. The sliding girder 10B is moved and positioned at the bridge girder erection position projecting in a cantilevered manner toward the distal end side of the bridge girder 3. Next, in the fourth step, as shown in FIG. The held crane device 12B is moved on the sliding girder 10B to the distal end side to the outside of the distal end of the bridge girder 3, and the pair of main girders 4 are installed on the distal end side of the bridge girder 3 via the crane mechanism 14B. Similarly to the first embodiment, the cross girder 5 is also lifted by the crane device 12B at the lifting position, and is transferred to the cross girder transport device 23B provided in the sliding girder 10B. Are transported to the leading end side and connected to a pair of main girders 4. Thereafter, similarly, a pair of main girders 4 is installed on the tip side of the bridge girder 3 on the other tip side of the bridge girder 3.

  According to the bridge girder erection device 1B and the bridge girder erection method, the same effects as those of the first and second embodiments are obtained, but as a different effect, a crane having a cart mechanism as in the first and second embodiments. Since no equipment is required, the preparatory load in the first step can be reduced, the equipment cost can be reduced, and there is no need to transfer the crane mechanism 12B from the carriage mechanism to the moving carriage. The process of transporting the main girder 4 in the direction of the bridge axis can be simplified.

  Note that a sliding girder having a structure as in the first embodiment may be applied as the sliding girder 10B. In this case, when a plurality of pairs of main girders 4 are alternately assembled to both ends of the bridge girder 3 that cantilevered from the bridge girder 3 installed on the upper end of the bridge pier 2 to both sides in the direction of the bridge axis, It is possible to equip the bridge girder 3 with two sets of sliding girder 10B and crane device 12B that are symmetrical in the direction of the bridge axis.

  In addition, in the range which does not deviate from the meaning of the present invention, the bridge girder erection apparatus and the bridge girder erection method can be implemented by adding various changes other than the disclosed items.

It is a side view of the bridge girder erection device of Example 1. It is a side view of a sliding girder and a moving trolley. It is a front view of a sliding girder and a moving trolley. It is a side view of a crane apparatus. It is a front view of a crane apparatus. It is a front view of a crane apparatus. It is a front view of a crane apparatus. It is a side view of a sliding girder and a movable carriage showing the first step. It is a side view of the bridge girder installation apparatus in the second step. It is a front view of the crane apparatus which shows a 2nd process. It is a side view of the bridge girder installation apparatus in the third step. It is a side view of the bridge girder installation apparatus which shows a 4th process. It is a side view of the bridge girder installation apparatus which shows a 4th process. It is a front view of the bridge girder installation apparatus which shows a 4th process. It is a side view which shows the 1st step of the cross beam conveyance process of a 4th process. It is a front view which shows the 1st step of the cross beam conveyance process of a 4th process. It is a side view which shows the 2nd step of the cross beam conveyance process of a 4th process. It is a front view which shows the 2nd step of the cross beam conveyance process of a 4th process. It is a side view which shows the 3rd step of the cross beam conveyance process of a 4th process. It is a front view which shows the 3rd step of the cross beam conveyance process of a 4th process. It is a side view showing the 4th step of the bridge girder conveyance process of the 4th process. It is a front view which shows the 4th step of the cross beam conveyance process of a 4th process. It is a side view of the bridge girder installation apparatus which shows a 4th process. It is a front view of the bridge girder installation apparatus which shows a 4th process. It is a side view of the bridge girder installation apparatus of Example 2. FIG. It is a side view of the bridge girder installation apparatus of Example 3. It is a side view of the bridge girder installation apparatus which shows a 2nd process. It is a side view of the bridge girder installation apparatus which shows a 3rd process. It is a side view of the bridge girder installation apparatus which shows a 4th process.

Explanation of symbols

1, 1A, 1B Bridge girder installation device 2 Bridge pier 3 Bridge girder 4 Main girder 5 Horizontal girder 10, 10A, 10B Sliding girder 11, 11A, 11B Mobile cart 12, 12B Crane device 13 Cart mechanism 14 Crane mechanism 41 Traveling platform 41a Bridge girder member Mounting portion 42 Leg member 43b Traveling wheel 45a Hydraulic jack 45b Spacer 52 Main girder width direction moving mechanism

Claims (9)

In the bridge girder installation device for sequentially assembling the bridge girder members at the tip of the bridge girder that is cantilevered from the bridge girder constructed at the upper end of the bridge pier,
A sliding girder equipped on the bridge girder so as to be movable along the bridge girder,
A moving carriage equipped on this sliding girder so as to be movable in the direction of the bridge axis,
A carriage mechanism that can move on the bridge girder along the bridge girder and a crane mechanism that is mounted on the carriage mechanism and is releasably connected. The pair of bridge girder members are disposed outside the both ends in the width direction of the bridge girder. It has a crane device that can transport in the vertical direction and the bridge axis direction,
After moving the crane device carrying a pair of bridge girder members to a position where the bridge girder is overlapped with one end of the sliding girder on the pier side, the crane mechanism is separated from the carriage mechanism and transferred onto the movable carriage. A bridge girder erection device configured to be moved on a sliding girder by a movable carriage.   The crane mechanism of the crane apparatus includes a pair of suspended girder members at the same height as a main body member including a sliding girder one end portion of the bridge girder and a movable carriage movably mounted and supported. 2. The bridge shaft transport position that is located outside the both ends in the width direction of the member is configured to be transportable in the bridge shaft direction by the carriage mechanism of the crane device and the movable carriage on the sliding girder. The bridge girder erection device described in 1.   3. The bridge girder erection device according to claim 2, wherein the carriage mechanism of the crane apparatus includes a bridge girder member placing portion for placing a pair of bridge girder members at the bridge shaft transport position.   4. The bridge girder erection device according to claim 2, wherein the crane mechanism of the crane apparatus includes a width direction moving unit that moves a pair of suspended girder members in the width direction of the bridge girder. The crane mechanism of the crane device has a traveling table having a plurality of traveling wheels, and a plurality of pairs of leg members erected on the traveling table, and the crane mechanism of the crane device has a table member,
One end portion of the sliding girder on the pier side is configured such that it can be inserted between the plurality of pairs of leg members and below the base member of the crane mechanism, together with the movable carriage disposed thereon. The bridge girder erection device according to claim 4. The plurality of pairs of leg members of the cart mechanism are each provided with a hydraulic jack for pushing up the crane mechanism and a spacer that can be removed while the crane mechanism is pushed up,
The bridge girder erection apparatus according to claim 5, wherein the crane mechanism is transferred from the carriage mechanism onto the movable carriage by removing the spacers from the plurality of pairs of leg members.   After separating the crane mechanism from the cart mechanism, one end portion of the sliding girder on the pier side is connected to the bridge girder via the cart mechanism to function as a counterweight. The bridge girder installation device described. In the bridge girder erection method in which the bridge girder members are sequentially assembled to the end of the bridge girder that is cantilevered from the bridge girder constructed at the upper end of the pier,
A first step of preparing a sliding girder movable on the bridge girder in the direction of the bridge axis and cantilevered from the bridge girder in the direction of the bridge axis, and a movable carriage movable on the sliding girder in the direction of the bridge axis;
A second step of lifting a pair of bridge girder members to the outside of both ends of the bridge girder in the width direction and above the lower end of the bridge girder using a crane device;
The crane apparatus that holds the pair of bridge girder members is moved in the direction of the bridge axis on the bridge girder, and the crane mechanism that forms a part of the crane apparatus is moved to the movable carriage with the pair of bridge girder members suspended. A third step to be placed;
A fourth step of moving the movable carriage and the crane mechanism on the sliding girder to the distal end side thereof, and constructing a pair of bridge girder members on the distal end side of the bridge girder via the crane mechanism;
A bridge girder construction method characterized by comprising In the bridge girder erection method in which the bridge girder members are sequentially assembled to the end of the bridge girder that is cantilevered from the bridge girder constructed at the upper end of the pier,
A sliding girder that can move on the bridge girder in the direction of the bridge axis and cantilevered from the bridge girder in the direction of the bridge axis and a crane device that is equipped on this girder and can move on the sliding girder in the direction of the bridge axis A first step of
A second step of lifting a pair of bridge girder members to the outside of both ends of the bridge girder in the width direction and above the lower end of the bridge girder using a crane device;
A third step of moving the crane device and the sliding girder that hold the pair of bridge girder members in the bridge axis direction on the bridge girder;
A fourth step of moving the crane device holding the pair of bridge girder members on the sliding girder to the tip side, and laying the pair of bridge girder members on the tip side of the bridge girder via the crane mechanism;
A bridge girder construction method characterized by comprising