JP7279243B1 - Dismantling and conveying device for bridge girder and dismantling and conveying method - Google Patents

Abstract

A bridge girder dismantling conveying device and dismantling conveying method capable of dismantling and conveying a bridge girder efficiently without occupying part or all of the space under the girder. A bridge girder dismantling conveying device (50) dismantles and conveys an existing bridge girder (G) erected on the existing bridge pier (P), and a plurality of dismantling and conveying devices (50) are arranged above the bridge girder (G) at intervals. a temporary support 60, a temporary girder 10 constructed on the plurality of temporary supports 60 and extending in the direction of the bridge axis, and a mobile trolley 20 moving along the temporary girder 10, and the mobile trolley 20 A work floor 27 having a width equal to or larger than the width of the bridge girder G in the direction perpendicular to the axis of the bridge, is disposed below the bridge girder G, and suspends the work floor 27 from which the bridge girder G is cut to form a divided body D for transportation. . [Selection drawing] Fig. 4

Description

Application of Article 30, Paragraph 2 of the Patent Act ・Construction pamphlet issued on November 4, 2021 ・Leaflet issued on April 5, 2022 ・May 14, 2022 and Reiwa 4 Flyers distributed in newspaper inserts on May 28, 2020 ・Newsletter issued on May 27, 2022 ・Company public relations magazine (Hanshin Highway) 225 issued on April 1, 2022 No. 2022 SPRING pages 8-9 ・Press release materials released on December 10, 2021 and April 5, 2022 ・Materials from the president's regular press conference held on April 5, 2022・Special site established on April 5, 2022 ・Interview video released on May 13, 2022 (company website and YouTube) ・March 23, 2022, 2022 Interview videos released on May 19, May 26, 2020, and May 27, 2020 (Twitter and Facebook) Public Interest Incorporated Association Japan released on April 7, 2022 Website of the Bus Association ・Sent materials to the media on May 16, 2022 and June 21, 2021 ・On March 23, 2022, near Kireuriwari on the No. 14 Matsubara Line "Closed to traffic due to bridge replacement work" briefing session ・"Closed to traffic due to bridge replacement work near Kireuriwari on Route 14 Matsubara Line" held from May 23, 2022 to May 25, 2022 Promote ・5 pages of the Yomiuri Shimbun morning edition published on May 14, 2022 ・Construction started on June 1, 2022 ・Issued on July 27, 2024, 2020 CSR report published on the company website on July 29 ・Three papers that started to be viewed on the web on August 1, 2022 For the 77th Annual Academic Lecture Meeting)

TECHNICAL FIELD The present invention relates to a bridge girder dismantling conveying device and a dismantling conveying method.

In Japan, various bridges constructed during the period of high economic growth are aging. construction) is expected to increase.
There are various forms of bridges, such as bridges that cross rivers, bridges that form part of highways and cross roads and railways on the ground. In the repair work of bridges, it is necessary to take measures such as partially closing the roadway or completely closing the roadway for a certain period of time before carrying out the bridge repair work. There is a problem that the construction work can have a great impact on the surrounding traffic.
In addition, for example, in repair work while partially closing the roadway, the progress of the work often does not progress, and as a result, there is a problem that the repair work period extends for a long time.

Looking at the method of dismantling the bridge girder that constitutes an aged bridge among bridge repair work, there are various construction methods for this dismantling work. Among them, the crane bent method is a method in which the bridge girders are dismantled and removed sequentially while supporting the existing bridge girders by installing a vent in the space under the girder, but construction is difficult if the space under the girder cannot be used as a construction yard. , the above-mentioned repair work in the urban area will inevitably close part or all of the roadway.
In addition, the crane batch method (large block dismantling method) is a method in which the bridge girders are dismantled while suspended by a crane, and the dismantled bridge girders are lifted all at once by a crane and carried out. If the yard cannot be used as a construction yard, construction will be difficult.
In the pull-back method using a hand-stretching machine, the bridge girder is connected to the hand-stretching machine, the bridge girder is jacked up, and pulled back by the hand-stretching machine. is difficult to construct.
In addition, the retraction method by vertical movement of the erection garter installs temporary vent facilities on the existing abutments and piers, installs temporary girders on the temporary vent facilities, installs roller facilities on the temporary girders, and uses winches and jacks to It is a construction method that lifts the bridge girder and carries it out. With this construction method, when the weight of the bridge girder to be lifted is large, it is necessary to use large-scale temporary vent facilities and temporary girder to support it. Since it cannot move in the direction perpendicular to the axis, if the width of the bridge girder in the direction perpendicular to the bridge axis is wide, it will be extremely difficult to remove and transport the bridge girder without being restricted by the space under the girder.

In this way, existing bridge girder dismantling and removal methods (dismantling and transportation methods) require that the space under the girder be used as a construction yard, or occupy at least part or all of the space under the girder. There is a demand for a bridge girder dismantling conveying apparatus and a dismantling conveying method that can efficiently dismantle and convey bridge girders without occupying part or all of the space.

Here, Patent Literature 1 proposes a bridge replacement construction method. This method consists of a lifting process to lift the existing girder to be removed across the span of the bridge, a renewal girder connection process to connect the new girder to the rear end of the existing girder in a row, and the tip of the existing girder. The tip extension girder connection process to connect the tip extension girders in a row, and the renewal girder connection process and tip extension so that the new renewal girder is sent to the span where the existing girder to be removed was placed. The process of sending out the existing girders to be removed, the new renewal girders and the tip extension girders connected in the girder connection process in the direction of the bridge axis, and the bridge between the span where the existing girder to be removed was placed and the adjacent span. It is equipped with a dismantling process, etc., for dismantling the part of the existing girder to be removed that was sent out in the sending process upward.
In the lifting process to lift the existing girder, multiple vents are installed in the space under the girder below the existing girder, jacks are placed on the upper end surface of the vent, and the existing girder is lifted by jacking up.

Japanese Patent Application Laid-Open No. 2019-19508

According to the bridge replacement construction method described in Patent Document 1, since the existing girders to be removed can be carried out and the new replacement girders can be erected continuously, the bridge can be replaced efficiently. They say they can. However, even in this bridge replacement method, vents and jacks are installed in the space under the girder below the existing girder, and the existing girder is jacked up and lifted. Alternatively, it does not realize the construction of efficiently dismantling and transporting the bridge girders without occupying the entire area.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a bridge girder dismantling conveying apparatus and a dismantling conveying method capable of dismantling and conveying a bridge girder efficiently without occupying part or all of the space under the girder.

In order to achieve the above object, one aspect of the bridge girder dismantling and conveying apparatus according to the present invention includes:
A bridge girder dismantling and conveying device for dismantling and conveying an existing bridge girder erected on an existing bridge pier,
a plurality of temporary supports spaced above the bridge girder;
Temporary girders installed on the plurality of temporary supports and extending in the direction of the bridge axis;
a mobile trolley that moves along the temporary girder;
The mobile trolley has a width equal to or greater than the width of the bridge girder in the direction perpendicular to the bridge axis. It is characterized by

According to this aspect, temporary girders are erected on a plurality of temporary supports arranged on existing bridge girders, and a work floor suspended from a mobile carriage that moves along the temporary girders is used to By dismantling and transporting the bridge girders, it is possible to efficiently dismantle and transport the bridge girders without occupying part or all of the space under the girders. Here, since part or all of the space under the girder is not used, if the space under the girder is a road or railway, dismantling and transporting the bridge girder while keeping it in service without closing part or all of it It can be performed.
In addition, the work floor has a width equal to or greater than the width of the bridge girder in the direction perpendicular to the bridge axis, and is arranged below the bridge girder, so that the divided body for transportation formed by cutting the bridge girder is space under the girder. can be prevented from falling into the ground, ensuring construction safety. In particular, even when dismantling bridge girders that are wide in the direction perpendicular to the bridge axis, such as bridge girders that make up expressways, the working floor covers the entire width of the bridge girder in the direction perpendicular to the bridge axis, ensuring sufficient construction safety. Guaranteed.

Here, "a width equal to or greater than the width of the bridge girder in the direction perpendicular to the bridge axis" means, for example, if there is only one girder on the bridge pier, it means the full width of the girder. When bridge girders are installed side by side (e.g., when multiple bridge girders corresponding to the up and down lines of an expressway are installed side by side), if one of the bridge girders is to be demolished, the width of that one bridge girder will be the width of the bridge girders to be demolished. If is all bridge girders, the total width is the sum of the widths of all bridge girders.
Bridge girders to be removed are built on piers and abutments, and in this specification, piers also include abutments.
Bridges with bridge girders to be removed include steel bridges, concrete bridges, stone bridges, wooden bridges, etc. Concrete bridges include reinforced concrete bridges (RC) and prestressed concrete bridges (PC). concrete bridges), steel-concrete composite bridges, etc. Bridge girders to be removed include main girders that make up girder bridges and rigid-frame bridges, truss girders that make up truss bridges, and stiffening girders that make up suspension bridges and cable-stayed bridges. Types of shapes include I-shaped, H-shaped, T-shaped, box-shaped, lattice-shaped, and the like.

In another aspect of the bridge girder dismantling and conveying device according to the present invention,
The temporary girder is provided with a first rail extending in the direction of the bridge axis,
A plurality of temporary girders are placed side by side at intervals in the direction perpendicular to the bridge axis,
The mobile trolley is movably installed with respect to the plurality of first rails,
A first upper girder extending in a direction perpendicular to the bridge axis is installed on the mobile truck,
Suspension members are suspended from the left and right end sides of the first upper girder, and the work floor is suspended by the suspension members.

According to this aspect, the mobile trolley is movably installed with respect to the plurality of first rails provided on the plurality of temporary girders spaced apart in the direction perpendicular to the bridge axis. , the mobile trolley containing the divided body can convey the divided body in a more stable posture. In addition, the first upper girder extending in the direction perpendicular to the bridge axis is installed so as to straddle the mobile trolley installed on each first rail, and the hanging material is suspended from the left and right ends of the first upper girder. Since the work floor is supported by the , the work floor is supported by the mobile truck in a stable posture over the entire area in the direction perpendicular to the bridge axis. For example, by installing protective materials such as protective fences and protective sheets at the left and right ends of the work floor and the rear end in the direction of movement in the bridge axis direction, it is possible to prevent the divided body from falling from the work floor and the workers. Falling or the like can be prevented, and construction safety can be further enhanced.

In another aspect of the bridge girder dismantling and conveying device according to the present invention,
It is characterized in that the working floor is provided with a shoring for supporting the divided body.

According to this aspect, since the shoring for supporting the divided body is provided on the work floor, when the bridge girder is cut, the divided body falls to the work floor and generates an impact sound, and the divided body falls. It is possible to prevent damage to the work floor due to

In another aspect of the bridge girder dismantling and conveying device according to the present invention,
The length of the temporary girder is longer than the removal range of the bridge girder.

According to this aspect, since the length of the temporary girders is longer than the removal range of the bridge girders, the bridge girders are removed sequentially while moving the mobile truck along the temporary girders, thereby partially removing the space under the girders. Alternatively, the entire removal range of the bridge girder can be removed without occupying the entire area.

Another aspect of the bridge girder dismantling conveying device according to the present invention is
further comprising a second rail disposed on the temporary girder and extending in the direction of the bridge axis;
A carriage is movably installed on the second rail,
A second upper girder extending in a direction perpendicular to the bridge axis is installed on the carriage,
The second upper girder is provided with first lifting equipment for lifting the divided body, and the carriage is provided with accommodation equipment for containing the divided body lifted by the first lifting equipment. It is characterized by

According to this aspect, a separate second rail extending in the direction of the bridge axis is arranged on the temporary girder, a separate carriage is movably installed on the second rail, and is installed on the carriage and perpendicular to the bridge axis. The divided body is lifted by the first lifting equipment provided on the second upper girder extending in the direction, and the lifted divided body is stored and transported by the storage equipment provided on the carriage. Therefore, the divided body can be lifted up smoothly and carried out safely.

In another aspect of the bridge girder dismantling and conveying device according to the present invention,
The carriage includes a fourth rail extending in the direction of the bridge axis,
The second upper girder is movably installed with respect to the fourth rail,
The second upper girder has a fifth rail extending in a direction perpendicular to the bridge axis,
The first lifting equipment is movably installed with respect to the fifth rail.

According to this aspect, the second upper girder is movably installed along the fourth rail provided on the carrier and extending in the direction of the bridge axis, and the second upper girder is provided on the second upper girder and extends in the direction perpendicular to the bridge axis. Since the first lifting equipment is movably installed along the fifth rail, it is possible to move the first lifting equipment in the direction of the bridge axis and in the direction perpendicular to the bridge axis. It is possible to access the first lifting equipment to the divided body to be placed, lift it and store it in the storage equipment. In particular, when the overall width of the bridge girder to be removed is wide and the width of the working floor is accordingly wide, a configuration in which the first lifting equipment can move freely in both the direction of the bridge axis and the direction perpendicular to the axis of the bridge is suitable. .

Another aspect of the bridge girder dismantling conveying device according to the present invention is
further comprising a third rail disposed on the temporary girder and extending in the direction of the bridge axis;
A suspension crane is movably installed on the third rail,
The suspension crane includes a sixth rail extending in a direction perpendicular to the bridge axis, and a second lifting equipment movably installed on the sixth rail, and the divided crane is divided by the second lifting equipment. The body is transported in the direction perpendicular to the bridge axis, and the transported divided body is lifted by the first lifting equipment and stored in the storage equipment.

According to this aspect, a separate third rail extending in the direction of the bridge axis is provided on the temporary girder, a separate suspension crane is movably installed on the third rail, and the suspension crane is installed on the bridge. The second lifting equipment is movably installed on the sixth rail extending in the direction perpendicular to the axis, so that the second lifting equipment can access the divided body formed by cutting the bridge girder and lift it to lift the bridge. It can be conveyed to a desired position in the axis-perpendicular direction, where it can be replaced with the first lifting equipment to lift the divided body and house it in the housing equipment. Therefore, if the entire width of the bridge girder to be removed is wide and the moving range of the 1st lifting equipment in the direction perpendicular to the bridge axis cannot cover the entire width of the bridge girder, the length of the 6th rail is set to cover the entire width of the bridge girder. This allows the divided body to be stored in the storage facility regardless of the position of the divided body placed on the working floor.

Another aspect of the bridge girder dismantling conveying device according to the present invention is
The first rail, the second rail and the third rail are installed at different positions of the temporary girder,
The movable truck, the transport truck, and the suspension crane are movable independently of each other in the direction of the bridge axis.

According to this aspect, the first rail, the second rail, and the third rail are installed at different positions on the temporary girder, and the movable truck, the carrier truck, and the suspension crane can move independently of each other in the direction of the bridge axis. As a result, for example, the mobile trolley and the suspension crane can be moved to the next removal area in parallel with the transporting of the divided body by the transporting trolley, and efficient construction from demolition of the bridge girder to carrying out can be realized.

In addition, one aspect of the method for dismantling and transporting bridge girders according to the present invention is
A bridge girder dismantling and conveying method for dismantling and conveying an existing bridge girder erected on an existing bridge pier, comprising:
A step of installing a plurality of temporary supports above the bridge girder at intervals, and erecting temporary girders extending in the bridge axis direction on the plurality of temporary supports;
A step B in which a mobile truck is movably installed on the temporary girder, and a work floor provided below the bridge girder is suspended from the mobile truck;
C. Moving the mobile trolley in the direction of the bridge axis, aligning it with the dismantling area of the bridge girder, cutting the bridge girder using the work floor to form a divided body for transportation, and carrying out the divided body. It is characterized by having a step.

According to this aspect, a plurality of temporary supports are arranged on the existing bridge girders, and after the temporary girders are erected on the plurality of temporary supports, the temporary girders are suspended from a mobile truck that moves along the temporary girders. Efficient dismantling and transportation of bridge girders can be realized without occupying part or all of the space under the girders by dividing the bridge girders into multiple divisions for transportation using the working floor. .

Another aspect of the method for dismantling and transporting bridge girders according to the present invention is
A bridge girder dismantling and conveying method for dismantling and conveying an existing bridge girder erected on an existing bridge pier, comprising:
A plurality of temporary supports are installed at intervals above the bridge girder, temporary girders extending in the direction of the bridge axis are erected on the plurality of temporary supports, and each of the temporary girders is connected to the bridge axis. A process comprising a first rail, a second rail and a third rail extending in the direction of
A mobile truck is movably installed on the first rail, a carrier truck is movably installed on the second rail, a suspension crane is movably installed on the third rail, and the bridge girder is mounted on the mobile truck. A B step of suspending the work floor arranged below the
The mobile trolley is moved in the direction of the bridge axis, the work floor is aligned with the dismantling area of the bridge girder, and the bridge girder is cut using the work floor to divide the bridge girder into pieces for transportation. Then, the divided body is transported in the direction perpendicular to the bridge axis by the suspension crane, the divided body is lifted and stored in the storage facility provided on the transportation truck, and the transportation truck is moved in the direction of the bridge axis to move the divided body. carrying out, and a C step.

According to this aspect, a plurality of temporary supports are arranged on the existing bridge girders, the temporary girders are installed on the plurality of temporary supports, and then the temporary girders are arranged and extended in the bridge axis direction. A mobile trolley, a transport trolley, and a suspension crane are installed and moved on the 1st rail, the 2nd rail, and the 3rd rail. After the divided body is transported to the desired position (for example, the central position) in the direction perpendicular to the bridge axis of the work floor with a suspension crane, it is lifted by a carriage, stored in a storage facility, and carried out. Efficient dismantling and transport of bridge girders can be realized without occupying part or all of the space under the girders.

In another aspect of the method for dismantling and transporting bridge girders according to the present invention,
In the A step, the temporary support is installed in the area above the pier of the bridge girder,
In the step B, the mobile trolley and the suspension crane are arranged in respective left and right regions of the bridge girder projecting to the left and right of the bridge pier,
In the step C, the bridge girders in each area are dismantled toward the pier so that the left area and the right area have the same overhang length from the pier.

According to this aspect, a temporary support is installed in the area above the piers of the bridge girders, and unique mobile trolleys and suspension cranes are arranged in the left and right areas of the bridge girders projecting to the left and right of the piers. After that, the bridge girders in each area are dismantled toward the piers so that the lengths of overhangs from the piers in the left and right areas are the same, and the temporary supports on the piers become fulcrums. As a result, the bridge girder can be dismantled and removed while balancing the left and right areas of the bridge girder. Here, the divided bodies generated in the left side area and the right side area can be repeatedly loaded on a common carriage and carried out. Here, "the length of the overhang is the same" includes not only the length being exactly the same but also the length of the overhang of the left side area and the right side area being different within the range of balance. there is

Another aspect of the method for dismantling and transporting bridge girders according to the present invention is
In step C, if the length of overhang from the bridge pier is different between the left side region and the right side region, the bridge girder in the difference section of the region with the longer overhang length is temporarily suspended from the temporary girder. The overhanging length of the left side area and the right side area is made the same by removing in advance.

According to this aspect, when the length of overhang from the bridge pier in the left side area and the right side area is different, the bridge girder in the difference section in the area with the longer overhang length is temporarily removed from the temporary girder in a state of being temporarily suspended. By making the overhang length of the left side area and the right side area the same, after that, the bridge girder can be dismantled and removed while balancing the left side area and the right side area of the bridge girder.

According to the bridge girder dismantling conveying apparatus and dismantling conveying method of the present invention, the bridge girder can be dismantled and conveyed efficiently without occupying part or all of the space under the girder.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of an example of a construction area to which a method for dismantling and conveying a bridge girder according to an embodiment is applied; FIG. 2 is a side view of the bridge to be demolished as viewed from the direction of arrow II in FIG. 1 ; It is a view in the direction of arrow III in FIG. 1, and is a vertical cross-sectional view of the bridge in the direction perpendicular to the bridge axis. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of an example of a dismantling conveying apparatus according to an embodiment viewed from a bridge axis direction together with a bridge girder to be dismantled; 1 is a perspective view showing only an example of a movable carriage movably installed on a plurality of temporary girders in the dismantling transport apparatus according to the embodiment; FIG. 1 is a front view showing only one example of a carrier carriage movably installed on a plurality of temporary girders in the dismantling carrier according to the embodiment; FIG. FIG. 6B is a view taken in the direction of arrow B in FIG. 6A and is a plan view of an example of the carriage. FIG. 3 is a perspective view showing only one example of a carriage that is movably installed on a plurality of temporary girders. It is the front view which extracted and showed only an example of the suspension crane currently installed movably on several temporary girders among the dismantling conveyance apparatuses which concern on embodiment. 1 is a perspective view showing only one example of a suspension crane movably installed on a plurality of temporary girders; FIG. It is explanatory drawing explaining the flow of a series of construction from dismantling of a bridge girder to accommodation to an accommodation facility. FIG. 8B is an explanatory diagram illustrating the flow of a series of construction steps from dismantling of the bridge girder to storage in the storage facility, following FIG. 8A. FIG. 8B is an explanatory diagram illustrating the flow of a series of construction steps from demolition of the bridge girder to storage in the storage facility, following FIG. 8B; It is process drawing of an example of the dismantling conveyance method which concerns on embodiment. FIG. 9B is a process diagram of an example of the dismantling transportation method according to the embodiment, following FIG. 9A. FIG. 9B is a process diagram of an example of the dismantling transportation method according to the embodiment, following FIG. 9B; FIG. 9C is a process diagram of an example of the dismantling transportation method according to the embodiment, following FIG. 9C; FIG. 10B is a process diagram of an example of the dismantling and conveying method according to the embodiment, following FIG. 10A; It is a figure which shows the construction state shown to FIG. 10B as a perspective view.

Hereinafter, a bridge girder dismantling conveying apparatus and a dismantling conveying method for a bridge girder according to an embodiment will be described with reference to the accompanying drawings. In addition, in the present specification and drawings, substantially the same components may be denoted by the same reference numerals, thereby omitting duplicate descriptions.

[Bridge girder dismantling transport device according to the embodiment]
First, with reference to FIGS. 1 to 8, an example of a bridge girder dismantling and conveying apparatus according to an embodiment will be described. Here, FIG. 1 is a plan view of an example of a construction area to which the method for dismantling and conveying bridge girders according to the embodiment is applied, and FIG. FIG. 3 is a side view of a bridge, and FIG. 3 is a view taken in the direction of arrow III in FIG. Further, FIG. 4 is a front view of an example of the dismantling transport apparatus according to the embodiment as seen from the bridge axis direction together with a bridge girder to be dismantled, and FIG. Fig. 2 is a perspective view showing only one example of a movable carriage that is movably installed on a girder; Also, FIG. 6A is a front view showing only one example of a carrier carriage movably installed on a plurality of temporary girders in the dismantling transport apparatus according to the embodiment, and FIG. 6B is a front view of FIG. 6A. FIG. 6C is a perspective view showing only one example of a carrier movably installed on a plurality of temporary girders. Furthermore, FIG. 7A is a front view showing only one example of a suspension crane movably installed on a plurality of temporary girders in the dismantling transport apparatus according to the embodiment, and FIG. 1 is a perspective view showing only an example of a suspension crane movably installed on a girder; FIG.

As shown in FIG. 1, a bridge girder G that constitutes a bridge B to be renewed forms a part of an expressway that extends east-west through an urban area, and a roadway R that extends north-south in the space under the girder. In the vicinity of the intersection of the roadway R and the bridge B in plan view, there are bridge piers P2 and P3 that constitute the bridge B, and on the outside thereof (opposite side of the intersection) there are separate piers P1 and P4. The bridge girder G for three spans constructed on the bridge pier P is to be removed.

In the illustrated example, both the bridge girder G1 corresponding to the outbound line of the expressway and the bridge girder G2 corresponding to the inbound line are formed of reinforced concrete box girders. More specifically, it is a prestressed concrete bridge in which a plurality of simple girders constructed between adjacent piers P are tied together by PC steel materials. The bridge girders to be renewed are not limited to reinforced concrete box girders, and may be bridge girders of various forms such as I-shaped or T-shaped steel girders.

The dismantling conveying device 50 shown in FIG. 4 is a device for dismantling and conveying (carrying out) the bridge girder G extending in an intersecting manner above the road R shown in FIGS. This is a device that enables construction work to be carried out without occupying (using) the space under the bridge girder G when dismantling and transporting G.

The dismantling transport device 50 is installed on a plurality of temporary supports 60 (see FIG. 9C) arranged at intervals above the bridge girder G and extends in the bridge axis direction. 4) temporary girders 10 and three types of rails (first rail 11, second rail 12, third rail 13) arranged on the temporary girders 10. A carriage 20, a carriage 30, and a suspension crane 40 are used as main components. The method of installing the temporary support 60 for supporting the temporary girder 10 and the like will be explained in detail in the explanation of the dismantling transportation method below.

As shown in FIG. 4, two temporary girders 10A extend in the direction of the bridge axis above the outbound bridge girder G1 via temporary supports 60 (see FIG. 9C) not shown in FIG. It is erected in a posture that On the other hand, above the up-line bridge girder G2, two temporary girders 10B are erected in a posture extending in the bridge axis direction via a temporary support body 60, also not shown.

A first rail 11 is installed at the central position of the upper surface 10a of each temporary girder 10 in a posture extending in the direction of the bridge axis. A second rail 12 extends in the direction of the bridge axis on the inner end of the upper surface 10a of the temporary girders 10A and 10B located inside of the two temporary girders 10A and 10B for both the up line and the down line. installed in a posture. Further, on the left and right side surfaces 10b of each temporary girder 10, a third rail 13 is installed in a posture extending in the bridge axis direction.

An electric wheel 22 provided at the lower end of a main frame 21 having an inverted T shape in front view is installed so as to straddle the first rails 11 of each of the pair of temporary girders 10A. An electric wheel 22 provided at the lower end of a main frame 21 having an inverted T shape in front view is also installed on each of the first rails 11 of the pair of temporary girders 10B. A first upper girder 24 extending in the direction perpendicular to the bridge axis is spanned over the upper ends of the pair of main frames 21, and a roof 25 is provided above the first upper girder 24 to form a mobile trolley. 20 is configured.

A plurality of hanging members 26 formed of wires, chains, PC steel bars, etc. hang down from the vicinity of the left and right ends of the first upper girder 24 extending in the direction perpendicular to the bridge axis. , the work floor 27 is fixed.

As shown in FIG. 4 , the working floor 27 is suspended from the first upper girder 24 via hanging members 26 while being disposed below the two bridge girders G1 and G2 to be demolished. The width t2 of the working floor 27 in the direction perpendicular to the bridge axis is relatively wide with respect to the total width t1 in the direction perpendicular to the bridge axis of the two bridge girders G1 and G2.

Protective members 27a are erected on the left and right ends of the work floor 27. As shown in FIG. This protective material 27a is formed of a protective fence and a protective sheet such as a sound absorbing sheet installed on the protective fence. The work floor 27 has a rectangular shape in plan view, and protective members 27a are erected at the left and right ends of the work floor 27 . A protective material 27a is erected. As will be described below, since the bridge girder G is dismantled and removed when the mobile truck 20 moves in the bridge axis direction, there is no bridge girder G on the opposite side of the mobile truck 20 in the moving direction. The protective material 27a (not shown) on the side opposite to the moving direction of the mobile trolley 20 does not interfere with the bridge girder G, so it can be installed.

In this way, the protection members 27a are erected along at least three edges of the work floor 27, which is rectangular in plan view, thereby preventing equipment and workers on the work floor 27 from falling. A highly safe dismantling transport device 50 is formed.

As shown in FIG. 4, on the work floor 27, a shoring 28 is provided for supporting the bridge girder G to be demolished from below.

In this way, while the bridge girder G is supported by the shoring 28, by dividing the bridge girder G into a plurality of divided bodies each having a size for transportation, when the divided bodies are formed, they are divided on the working floor 27. It is possible to solve problems such as damage to the working floor 27 due to falling of the body and impact sound caused by the fall echoing around.

Here, FIG. 5 is a perspective view showing only the mobile carriage 20 hanging over the working floor 27 from the dismantling transport device 50, and the upper roof 25 shown in FIG. 4 is also omitted. In the mobile trolley 20 shown in FIG. 5, the first upper girder 24A has a hat shape in front view, but the other basic configuration is the same as the example shown in FIG. .

Thus, the mobile truck 20 is a truck for supporting the working floor 27 when dismantling the bridge girder G and forming a safe working space. Here, since the mobile trolley 20 is movable in the bridge axis direction along the first rail 11, it transports the divided body formed by dismantling the bridge girder G to the vicinity of the adjacent girder outside the removal range. , the divided body may be carried out via a crane or the like standing by on an adjacent girder.

Returning to FIG. 4, electric wheels 32 provided at the lower end of the main frame 31 are installed on the second rails 12 of the temporary girders 10A and 10B on the left and right inner sides, respectively. A second upper girder 34 extending in the direction perpendicular to the bridge axis is laid across the upper ends of the pair of main frames 31 to form the carriage 30 .

By referring to FIG. 6A showing only the carriage 30 extracted from the dismantling transport device 50, FIG. 6B showing its plan view, and FIG. become clear. A pair of main frames 31 form a frame along the bridge axis direction, and at the upper ends of both main frames 31, there are a plurality of second upper girders 34 (three in the illustrated example) extending in the direction perpendicular to the bridge axis. It is handed over. A fifth rail 35 extending in the direction perpendicular to the bridge axis is installed on one of the second upper girder 34, and the fifth rail 35 has a plurality of (two in the example shown) first A lifting equipment 37 is movably installed via an electric trolley 37a.

A fourth rail 33 extending in the direction of the bridge axis is installed on the upper ends of the pair of main frames 31, and an electric trolley provided at both ends of a second upper girder 34 having a first lifting equipment 37. The second upper girder 34 is installed movably in the bridge axis direction with respect to the pair of fourth rails 33 via 34b. Here, the first lifting equipment 37 in the illustrated example is formed by a chain block.

A housing facility 38 is provided between the pair of main frames 31 for housing dismantled divisions for transportation. A division lifted by a first lifting equipment 37 through a gap S1 between a pair of second upper girders 34A arranged at intervals in the bridge axis direction among the plurality of second upper girders 34 The body is adapted to be housed in the housing facility 38 . After storing the divided body in the storage equipment 38, the transporting cart 30 travels in the bridge axis direction along the second rail 12 and carries the divided body out of the site.

In the carriage 30, the second upper girder 34 suspending the first lifting equipment 37 moves along the fourth rail 33 in the bridge axis direction, and along the fifth rail 35 installed on the second upper girder 34 Since the first lifting equipment 37 moves in the direction perpendicular to the bridge axis via the electric trolley 37a, the first lifting equipment 37 is movable in both the direction of the bridge axis and the direction perpendicular to the bridge axis. Therefore, even if the divided bodies are placed at various positions on the work floor 27 (on the shoring 28 of the work floor), the first lifting equipment 37 can easily access and lift the divided bodies and store them in the storage equipment 38. can do.

Returning to FIG. 4, electric wheels 42 provided at the upper end of the main frame 41 are installed on the third rails 13 installed on the side surfaces 10b of the temporary girders 10A and 10B. A suspension crane 40 is configured by the plurality of main frames 41 .

The structure of the suspension crane 40 will become clearer by referring to FIGS. 7A and 7B showing only the suspension crane 40 extracted from the dismantling transport device 50. FIG. The suspension crane 40 is composed of a pair of main frames 41 arranged side by side in the direction of the bridge axis. Above the main frames 41, a sixth rail 43 extending in the direction perpendicular to the bridge axis is installed, and a second lifting equipment 44 is installed. It is installed movably in the direction perpendicular to the bridge axis with respect to the sixth rail 43 via an electric trolley 44a. The second lifting equipment 44 in the illustrated example is also formed of chain blocks, and a set of two second lifting equipment 44 is arranged on the left and right sides of the sixth rail 43, respectively. Each set of second lifting equipment 44 is applied to dismantling and transporting the left and right bridge girders G1 and G2, respectively.

At the central position of the main frame 41 in the direction perpendicular to the bridge axis, a temporary placement cradle 46 is suspended, and the divided body transported in the direction perpendicular to the bridge axis by a set of second lifting equipment 44 is temporarily It is temporarily placed on the placement table 46 .

Here, referring to FIGS. 8A to 8C, a series of steps from transportation of the divided body in the direction perpendicular to the bridge axis using the suspension crane 40 to lifting of the divided body by the carriage 30 and storage in the storage facility 38 are performed. Explain the flow.

First, as shown in FIG. 8A, reinforced concrete bridge girders G1 and G2 are cut and divided into a plurality of divided bodies D having a size and weight that can be transported in the bridge axis direction by a carrier 30. . More specifically, the length of each segment D in the bridge axis direction is cut to a width smaller than the width of the work floor 27 in the bridge axis direction, as shown in FIGS. 5 and 7B.

Such cutting work of the bridge girder G is performed on the work floor 27 by a worker using a cutting tool such as a wire saw.

FIG. 8A shows a state in which a divided body D having a balustrade at the end of one bridge girder G1 is cut and transported. In addition, in FIG. 8A and the like, the illustration of the shoring that supports the bridge girder G is omitted, and the work scaffold 28' installed on the work floor 27 around the bridge girder G is shown.

The divided body D formed by the operator cutting the bridge girder G1 on the working scaffold 28' is transported in the X1 direction and suspended to the second lifting equipment 44, after which the second lifting equipment 44 is moved to the sixth position. It is conveyed to the central position of the suspension crane 40 by moving along the rail 43 in the direction perpendicular to the bridge axis in the X2 direction.

Next, as shown in FIG. 8B , the divided body D transported by the second lifting equipment 44 is once deposited on the temporary placement receiving table 46 at the central position of the suspension crane 40 .

Above the temporary placement receiving table 46, a storage facility 38 for the carriage 30 and a first lifting facility 37 are arranged. More specifically, as is clear from FIG. 8B, the movement range t5 of the first lifting equipment 37 moving in the direction perpendicular to the bridge axis along the fifth rail 35 is the range t5 of the temporary placement receiving table 46 in the direction perpendicular to the bridge axis. is set wider than the width t6 of .

Therefore, when the first lifting equipment 37 descends in the X3 direction through the gap S2 between the temporary girders 10A and 10B, which are both inside, the first lifting equipment 37 enters the temporary placement receiving table 46. The split body D housed can be accessed, and the split body D can be lifted by the first lifting equipment 37 .

As shown in FIG. 8C , the divided body D lifted by the first lifting equipment 37 is accommodated in the accommodation equipment 38 . The carriage 30 moves in the direction of the bridge axis along the second rails 12 arranged on the bridge girders G1 and G2, and moves the divided body D to the vicinity of the crane standing by on the adjacent girder or the like not to be removed. After that, the divided body D is handed over to the crane and carried out to the outside. After transferring the divided body D to the crane, the carriage 30 moves along the second rail 12 to the next removal area.

By transporting the divided body D in the posture in which the divided body D is housed in the housing equipment 38 of the carriage 30, the divided body D can be carried out safely without being dropped.

Here, since the suspension crane 40 is movable in the bridge axis direction along the third rail 13, the divided body D can be moved as shown in FIG. The suspension crane 40 may move along the third rail 13 in the bridge axis direction while being lifted by the second lifting equipment 44 to transfer the divided body D to the crane.

4 to 8, three types of first rail 11, second rail 12, and third rail 13 are installed at different positions on each temporary girder 10, and a plurality of Above the temporary girder 10, a gate-shaped mobile carriage 20 having a relatively large front view size is disposed, and inside the mobile carriage 20, a relatively small gate-shaped transportation carriage 30 is provided. In addition, the suspension cranes 40 are arranged below the plurality of temporary girders 10, thereby forming a dismantling transport device 50 that can move independently of each other in the bridge axis direction.

As a result, the movable carriage 20, the transport carriage 30, and the suspension crane 40 can perform separate operations at the same time, thereby improving the efficiency of dismantling, transportation, and construction. For example, the mobile truck 20 and the suspension crane 40 cut the bridge girder G to form the divided body D and transport the divided body D in the direction perpendicular to the bridge axis. The construction of carrying out the divided body D in the direction of the bridge axis can be realized, and the bridge girder G can be efficiently dismantled and transported.

Further, according to the dismantling transport device 50, since it is not necessary to occupy the space under the bridge girder G to be removed, the roadway R in the space under the girder can be used, and the bridge girder G can be removed without traffic regulation. Dismantling and removal construction can be carried out. Also, in relation to this, since the dismantling and removal work is not carried out while restricting the roadway R, if possible, the work can be continued without time limits, and all the roadway R, including the transportation of materials and equipment, etc. Since it can be carried out in the air, construction efficiency can be further improved.

[Method for dismantling and transporting bridge girders according to the embodiment]
Next, with reference to FIGS. 9A to 9C and FIGS. 10A to 10C, an example of a method for dismantling and transporting a bridge girder according to the embodiment will be described. Here, FIGS. 9A to 10B are process diagrams of an example of the dismantling transportation method according to the embodiment, and FIG. 10C is a perspective view showing the construction state shown in FIG. 10B.

9A to 9C are process diagrams for explaining a method of installing a temporary girder 10 on the bridge girder G when dismantling and removing the existing bridge girder G among the dismantling transportation methods.

As shown in FIG. 9A, the bridge girder G to be dismantled and removed in the illustrated example is a bridge girder in which simple girders extending over three spans supported by four bridge piers P are tightly connected with PC steel materials. Adjacent girders G' outside the removal range are constructed on the bridge piers P1 and P4 at the left and right ends of the removal range.

Cranes C enter the removal range from the left and right adjacent girders G' to transport materials and equipment, and to install materials. First, each crane C installs the remodeling supports 61 and 62 on the bridge girder G in order from the central position of the removal range in the direction of the bridge axis. 2, the temporary girder divisions 10' are arranged so as to be continuous in the bridge axis direction, and the ends of adjacent temporary girder divisions 10' are connected to each other.

Each crane C moves back in the Y1 direction toward the left and right adjacent girders G' to install the replacement supports 61 and 62 and install the temporary girder division 10'. Here, the replacement support bodies 61 and 62 are replaced, for example, by removing the replacement support body 61 on the central side in the bridge axis direction in FIG. A replacement support 61 is replaced at a predetermined position on the adjacent girder G' side, and a new temporary girder division 10' is placed thereon. Thereafter, the remodeling support 62 shown in FIG. 9A is removed, and in the same manner, the remodeling support 62 is rebuilt at a predetermined position on the side of the adjacent girder G' where the temporary girder division 10' is newly installed, A new temporary girder division 10' is placed thereon.

As shown in FIG. 9B, on the piers P2 and P3, instead of the replacement supports 61 and 62, a temporary support 60 is installed to properly support the temporary girder 10 when the bridge girder G is removed. . Since the temporary support 60 is a support that shares and directly supports the long temporary girder 10 over each span, the replacement supports 61 and 62 used for constructing the temporary girder 10 It is a large-scale support with high rigidity. Here, the temporary support 60 is formed by assembling shaped steel materials such as H-shaped steel, angle steel, channel steel, etc., and applying short steel pipes, square steel pipes, etc. as necessary.

A temporary support 60 is installed on each pier P, and the long temporary girder 10 is supported by the temporary support 60, so the load of the temporary girder 10 is transferred to the pier P via the temporary support 60. transmitted smoothly.

After that, while the crane C moves backward, the re-installation of the re-installation supports 61 and 62, the installation of the temporary girder divisions 10', and the connection of the temporary girder divisions 10' are repeated, and as shown in FIG. 9C. Furthermore, a temporary support 60 is installed on the bridge piers P1 and P4.

The temporary girder 10 is formed by connecting a plurality of temporary girder divisions 10' arranged in the bridge axis direction to four temporary supports 60 installed above the four bridge piers P1 to P4. A temporary girder 10 is erected.

As shown in FIG. 9C, the length t9 of the temporary girder 10 is set to be longer than the section length t8 of the bridge piers P1 to P4, which is the removal range. Since the temporary girder 10 has a length longer than the removal range, the entire removal range of the bridge girder G can be dismantled and removed.

FIG. 9C also shows a state in which the temporary girder division 10' installed near the bridge pier P4 is transported in the Y2 direction using the multi-axle truck M. As shown in FIG. In this manner, the temporary girder divisions 10' may be transported by various transport means other than the crane C.

In each temporary girder division body 10', each division rail constituting the first rail 11, the second rail 12, and the third rail 13 is installed in advance, and when the temporary girder 10 is formed, A first rail 11, a second rail 12, and a third rail 13, each having a length approximately equal to that of the temporary girder 10, are simultaneously formed by connecting the divided rails in the direction of the bridge axis (process A). .

Next, as shown in FIGS. 10A to 10C, the temporary girders 10 are used to dismantle and remove the bridge girders G. FIG. First, as shown in FIG. 10A, the mobile trolley 20 is movably installed on the first rail 11 (see FIG. 4), the suspension crane 40 is movably installed on the third rail 13 (see FIG. 4), A work floor 27 arranged below the bridge girder G is suspended by the mobile truck 20, and the work floor 27 is surrounded by a protective material 27a. Note that the carriage 30 is not installed on the second rail 12 at the stage of FIG. 10A.

Here, the movable trolley 20 and the suspension crane 40 form a set of two units, and each set is arranged on the left and right of the central pier P2 and on the left and right of the pier P3. Then, one carriage 30 to be installed later is assigned to each of the left and right groups (the above is the B process).

For the removal of the bridge girder G, roughly four sections are set to be removed, and balance sections A and B are set on the left and right of the bridge pier P2. assigned. Then, the divided body D generated in the balance removal sections A and B is transported to the vicinity of the crane C waiting on the adjacent girder G' on the left side by the carriage 30 assigned to these sections. , the crane C is loaded onto the transport vehicle T and carried out of the site.

On the other hand, on the left and right of the bridge pier P3, balance removal sections C and D are set, and each set of mobile trolley 20 and suspension crane 40 is assigned to each section. Then, the divided body D generated in the balance sections C and D is also transported to the vicinity of the crane C waiting on the adjacent girder G' on the right side by the carriage 30 assigned to these sections, It is loaded onto a truck T via a crane C and carried out to the outside.

The dismantling and removal of the bridge girders G in the balance removal sections A and B and the balance removal sections C and D are carried out while balancing the overhang lengths of the left side area and the right side area of the bridge girder G projecting left and right from the bridge pier P2. In addition, it is called a "balanced removal section" because it is dismantled and removed while balancing the overhang lengths of the left side area and the right side area of the bridge girder G extending left and right from the pier P3.

For example, when comparing the overhang lengths of the left side region and the right side region of the pier P2, the length of the left side region is long. is precedently removed as the preceding removal section A (difference section). The same applies to the left and right regions of the pier P3. When comparing the overhang lengths of the left and right regions of the pier P3, since the length of the right region is longer, the left and right overhang lengths When removing while balancing the height, a partial section in the right side region is preliminarily removed as a pre-removal section B (difference section).

When removing the preceding removal sections A and B, a plurality of temporary hanging materials 70 made of PC steel bars or the like are suspended from the temporary girder 10, and each preceding removal section in the bridge girder G is suspended by the temporary hanging materials 70. , move the mobile truck 20 and the suspension crane 40 to the removal area and dismantle.

A crane C stands by in the vicinity of the preceding removal sections A and B, and if the work floor 27 is within reach of the boom of the crane C, a part of the dismantled bridge girder G on the work floor 27 is lifted by the crane. Receive directly at C and carry out. On the other hand, if there is no working floor 27 within the reach of the boom of the crane C, the mobile trolley 20 is moved to the crane C side, and after receiving a part of the bridge girder G dismantled by the crane C, it is carried out. .

In this way, by removing the preceding removal sections A and B, the overhang lengths of the left and right regions of the piers P2 and P3 are adjusted to be the same, or substantially the same within the range where balanced removal is possible. .

Next, as shown in FIG. 10B, the carriage 30 for sharing the left and right regions of the pier P2 and the carriage 30 for sharing the left and right regions of the pier P3 are connected to the second rail 12 of the temporary girder 10. is installed in

At the bridge pier P2, the mobile trolley 20 and the suspension crane 40 are aligned with the respective ends of the balance removal section A and the balance removal section B, and the bridge girder G is dismantled sequentially while being divided into a plurality of divided bodies D. The dismantled divided bodies D are sequentially loaded by the carrier 30, moved to the vicinity of the crane C, and delivered to the crane C to be carried out.

In the left region and the right region of the pier P2, the dismantling and removal speeds are balanced for both, and the lengths of both are balanced so that the overhang length from the temporary support 60 on the pier P2 is about the same. Dismantle and remove in the Y3 direction toward the pier P2 side.

In the bridge pier P3 as well, the dismantling and removal of the bridge girder G in the balance removal section C and the balance removal section D are advanced in the same manner as the dismantling and removal method for the left and right sides of the pier P2.

FIG. 10C is a perspective view of FIG. 10B as viewed obliquely from above. According to the dismantling transportation method according to the embodiment, since the space under the bridge girder G to be removed need not be occupied at all, as shown in FIG. can be done while using

The dismantling and removal of the mobile carriage 20 and the suspension crane 40 progresses up to the bridge piers P2 and P3, and all the bridge girders G within the removal range are dismantled and removed (above, step C).

After the bridge girder G is dismantled, the mobile truck 20, the transport truck 30, and the suspension crane 40 are dismantled and carried out, and the temporary girder 10 left on the bridge pier P is retracted, for example, to one adjacent girder G' side. , the temporary girder 10 is dismantled.

Thereafter, the existing bridge piers P are also dismantled and removed, new piers are constructed, and new bridge girders are erected on the new piers, thereby renewing the bridge.

It should be noted that other embodiments may be possible in which other components are combined with the configurations described in the above embodiments, and the present invention is not limited to the configurations shown here. Regarding this point, it is possible to change without departing from the gist of the present invention, and it can be determined appropriately according to the application form.

10, 10A, 10B: Temporary girder 10': Temporary girder division body 10a: Top surface 10b: Side surface 11: First rail 12: Second rail 13: Third rail 15: Safety fence 20: Mobile trolley 21: Main frame 22 : Electric wheel 24, 24A: First upper girder 25: Roof 26: Suspension material 27: Work floor 27a: Protective material 28: Shoring 28': Work scaffold 29: Third lifting equipment (chain block)
30: Carrier 31: Main frame 32: Electric wheel 33: Fourth rail 34, 34A: Second upper girder 34a: Electric trolley 35: Fifth rail 37: First lifting equipment (chain block)
37a: Electric trolley 38: Storage facility 40: Suspension crane 41: Main frame 42: Electric wheel 43: Sixth rail 44: Second lifting equipment (chain block)
44a: Electric trolley 46: Temporary placement cradle 50: Dismantling transport device (bridge girder dismantling transport device)
60: Temporary support 61, 62: Replacement support 70: Temporary suspension material (PC steel bar)
B: Bridge P, P1 to P4: Bridge pier G, G1, G2: Bridge girder G': Adjacent girder R: Roadway S1, S2: Gap D: Divided body C: Crane M: Multi-axle truck T: Truck

Claims (12)

A bridge girder dismantling and conveying device for dismantling and conveying an existing bridge girder erected on an existing bridge pier,
a plurality of temporary supports spaced above the bridge girder;
Temporary girders installed on the plurality of temporary supports and extending in the direction of the bridge axis;
a mobile trolley that moves along the temporary girder;
The mobile trolley has a width equal to or greater than the width of the bridge girder in the direction perpendicular to the bridge axis. A bridge girder dismantling and conveying device, characterized in that The temporary girder is provided with a first rail extending in the direction of the bridge axis,
A plurality of temporary girders are placed side by side at intervals in the direction perpendicular to the bridge axis,
The mobile trolley is movably installed with respect to the plurality of first rails,
A first upper girder extending in a direction perpendicular to the bridge axis is installed on the mobile truck,
2. The bridge girder dismantling and conveying apparatus according to claim 1, wherein hanging members are suspended from the left and right ends of said first upper girder, and said work floor is suspended by said hanging members. 3. The bridge girder dismantling and conveying apparatus according to claim 1, wherein the work floor is provided with a shoring for supporting the divided body. 3. The bridge girder dismantling and conveying apparatus according to claim 1, wherein the length of said temporary girder is longer than the removal range of said bridge girder. further comprising a second rail disposed on the temporary girder and extending in the direction of the bridge axis;
A carriage is movably installed on the second rail,
A second upper girder extending in a direction perpendicular to the bridge axis is installed on the carriage,
The second upper girder is provided with first lifting equipment for lifting the divided body, and the carriage is provided with accommodation equipment for containing the divided body lifted by the first lifting equipment. The bridge girder dismantling conveying device according to claim 2, characterized in that: The carriage includes a fourth rail extending in the direction of the bridge axis,
The second upper girder is movably installed with respect to the fourth rail,
The second upper girder has a fifth rail extending in a direction perpendicular to the bridge axis,
6. The bridge girder dismantling and conveying apparatus according to claim 5, wherein said first lifting equipment is movably installed with respect to said fifth rail. further comprising a third rail disposed on the temporary girder and extending in the direction of the bridge axis;
A suspension crane is movably installed on the third rail,
The suspension crane includes a sixth rail extending in a direction perpendicular to the bridge axis, and a second lifting equipment movably installed on the sixth rail, and the divided crane is divided by the second lifting equipment. 7. The bridge girder dismantling and conveying apparatus according to claim 6, wherein the body is conveyed in a direction perpendicular to the bridge axis, and the conveyed divided body is lifted by the first lifting equipment and stored in the storage equipment. . The first rail, the second rail and the third rail are installed at different positions of the temporary girder,
8. The bridge girder dismantling and conveying apparatus according to claim 7, wherein said movable carriage, said transport carriage and said suspension crane are movable independently of each other in the direction of the bridge axis. A bridge girder dismantling and conveying method for dismantling and conveying an existing bridge girder erected on an existing bridge pier, comprising:
A step of installing a plurality of temporary supports above the bridge girder at intervals, and erecting temporary girders extending in the bridge axis direction on the plurality of temporary supports;
A step B in which a mobile truck is movably installed on the temporary girder, and a work floor provided below the bridge girder is suspended from the mobile truck;
C. Moving the mobile trolley in the direction of the bridge axis, aligning it with the dismantling area of the bridge girder, cutting the bridge girder using the work floor to form a divided body for transportation, and carrying out the divided body. A method for dismantling and transporting a bridge girder, comprising: A bridge girder dismantling and conveying method for dismantling and conveying an existing bridge girder erected on an existing bridge pier, comprising:
A plurality of temporary supports are installed at intervals above the bridge girder, temporary girders extending in the direction of the bridge axis are erected on the plurality of temporary supports, and each of the temporary girders is connected to the bridge axis. A process comprising a first rail, a second rail and a third rail extending in the direction of
A mobile truck is movably installed on the first rail, a carrier truck is movably installed on the second rail, a suspension crane is movably installed on the third rail, and the bridge girder is mounted on the mobile truck. A B step of suspending the work floor arranged below the
The mobile trolley is moved in the direction of the bridge axis, the work floor is aligned with the dismantling area of the bridge girder, and the bridge girder is cut using the work floor to divide the bridge girder into pieces for transportation. Then, the divided body is transported in the direction perpendicular to the bridge axis by the suspension crane, the divided body is lifted and stored in the storage facility provided on the transportation truck, and the transportation truck is moved in the direction of the bridge axis to move the divided body. A method for dismantling and transporting a bridge girder, characterized by having a step C of carrying out. In the A step, the temporary support is installed in the area above the pier of the bridge girder,
In the step B, the mobile trolley and the suspension crane are arranged in respective left and right regions of the bridge girder projecting to the left and right of the bridge pier,
In the step C, the bridge girders in each area are dismantled toward the pier so that the length of overhang from the pier in the left area and the right area is the same, The method for dismantling and transporting a bridge girder according to claim 10. In step C, if the length of overhang from the bridge pier is different between the left side region and the right side region, the bridge girder in the difference section of the region with the longer overhang length is temporarily suspended from the temporary girder. 12. The method for dismantling and transporting a bridge girder according to claim 11, wherein the bridge girder is dismantled and conveyed according to claim 11, wherein the overhang lengths of the left side area and the right side area are made the same by removing in advance.

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