Component conveying device, component conveying method, slab removing method, and slab constructing method

Abstract

To provide a component conveying device and a component conveying method which can efficiently convey components such as precast slabs, and to provide a method to remove slabs, and a method to construct a deck slabs.SOLUTION: A component conveying device is equipped with a gantry crane 5 arranged as such that its cross beam portion 4 straddles a running track 3, and the gantry crane 5 is equipped with lifting means 9 that lifts an empty conveying cart 2a moving on the running track 3 and moves it to a position where it does not interfere with other conveying carts 2b on the running track 3, allowing the empty conveying cart 2a and other conveying carts 2b to pass each other.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a component transporting device and a component transporting method used for transporting components on bridges and elevated roads, and a method for removing and constructing decks using the same. [Background technology]

[0002] Traditionally, when constructing concrete structures in civil engineering and construction work, the precast concrete components (hereinafter referred to as PCa components) that make up the concrete structure are manufactured in advance at a factory, and then the PCa components are transported to the site and assembled (precast segment construction method (hereinafter referred to as PCa construction method)). This reduces the workload of assembling formwork, assembling rebar, pouring concrete, etc. on site, thereby shortening construction time and improving quality.

[0003] For example, in recent years, large-scale renovation work has been carried out on aging elevated roads and bridges, and the PCa method is being used in the deck replacement work in these cases in order to shorten the construction period.

[0004] This deck replacement work involves dividing the existing deck in a designated work area into multiple components (hereinafter referred to as existing deck components) in the bridge axis direction and removing them, and then lining up the PCa deck components for the deck that have been transported to the work area after removal in the bridge axis direction and erecting them on the bridge girders.

[0005] These existing deck components and PCa components are generally transported by trailer, which moves over the existing or newly constructed deck to travel between the work area and the disposal site or factory, etc., and a large crane is used to remove the existing deck components and load them onto the trailer, or to move the PCa components from the trailer to the installation site.

[0006] In addition, at sites where it is difficult for trailers to travel, PCa components and existing deck components are transported by moving a transport cart over the existing or newly constructed deck slabs.

[0007] Known transport carts include those that use tires to allow for a high degree of freedom of movement, and those that move on tracks laid on the deck slab. Generally, however, for construction and safety reasons, the tracks are laid directly above the bridge girders of the deck slab so that reaction forces are not transmitted directly to the existing or new deck slab (see, for example, Patent Document 1).

[0008] On the other hand, in deck replacement work, it is common to use a mobile crane to remove the existing deck and erect precast components for the deck. However, there are cases where a mobile crane cannot be installed due to the narrowness of the work area or restrictions on overhead height caused by overhead wires, etc. In such cases, the work is carried out using a dedicated erection machine with a reduced height. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent Application Publication No. 2019-173436 [Patent Document 2] Japanese Patent Application Publication No. 8-151607 Summary of the Invention [Problem to be solved by the invention]

[0010] However, with the conventional technology described above, when trailers or transport vehicles travel across the deck, there are often cases where materials and equipment are placed on the deck, and when replacing the deck while two lanes are in use, if trailers are used, it is difficult to ensure enough width for trailers to pass each other, and due to safety considerations such as the risk of collisions, it has been necessary to allow only one trailer to travel across (so-called piston transport).

[0011] In addition, when using a transport cart, the deck slab, when two lanes are in use, generally has four bridge girders, and tracks for the transport cart must be installed on the two central girders.Since only one track for a transport cart can be installed, only one transport cart needs to travel on the tracks.

[0012] As a result, trailers and transport carts running on tracks cannot pass each other, and the transport carts and trailers transporting the components must go back and forth one by one (so-called piston transport).If the round trip distance is long, the transport takes a lot of time, and even after the removal of the existing deck and the installation of the new deck have been completed at the site, it is necessary to wait for the next vehicle to arrive, which is inefficient.

[0013] In addition, when transporting parts using transport carts, a system is also known in which a double track section is set up in the middle of a single track, one of the tracks is used as a waiting area for empty transport carts, and a points switching device is used to allow the empty transport cart to run to the waiting area so that it can pass the next loaded transport cart (see, for example, Patent Document 2).

[0014] However, in order to install double-track tracks as described above, sufficient space is required across the width of the bridge to secure multiple tracks parallel to each other, and if there are restrictions due to site conditions, there is a problem that multiple tracks cannot be installed.

[0015] Furthermore, if there are restrictions on the overhead height at the work site, mobile cranes cannot be used, and the height of equipment such as erection machines and transport carts is also restricted, which creates the problem that transport carts cannot physically pass each other.

[0016] In view of the above-mentioned conventional problems, the present invention has been made with the aim of providing a component transporting device, a component transporting method, a method for removing a deck, and a method for constructing a deck, which can efficiently transport components such as precast concrete decks. [Means for solving the problem]

[0017] The invention described in claim 1, which solves the above-mentioned problems of the prior art, is characterized in that a component transport device having a plurality of transport carts that travel on a running track on a deck slab is provided with a gantry crane whose cross beam section is arranged to straddle the running track, and the gantry crane is provided with lifting means for hoisting an empty transport cart traveling on the running track and moving it to a position where it does not interfere with other transport carts on the running track, so that the empty transport cart and other transport carts can pass each other.

[0018] The invention described in claim 2 is characterized in that, in addition to the configuration of claim 1, the gantry crane is equipped with a self-propelled unit that can travel on a crane travel track that is arranged outside the deck width direction of the travel track.

[0019] The invention described in claim 3 is characterized in that, in addition to the configuration of claim 1 or 2, the lifting means is movably supported along the cross beam portion of the gantry crane, and the empty transport cart can be moved to a position on the side of the running track where it does not interfere with other transport carts on the running track.

[0020] The invention described in claim 4 is characterized in that, in addition to the configuration of claim 3, the transport cart comprises a plurality of running units each having a beam-shaped arm supported on a plurality of running sections arranged at intervals in the width direction of the running track, and a loading platform supported by the plurality of running units and having a width narrower than the width of the running track, and the running units are switchable between a position where the plurality of running sections can move on the running track and a position where they are stored on the loading platform side.

[0021] The invention as set forth in claim 5 is characterized in that, in addition to the configuration of claim 4, the arm portion and the platform portion of the traveling unit are rotatably connected to each other.

[0022] The invention as set forth in claim 6 is characterized in that, in addition to the configuration of claim 4, the arms of the traveling unit are configured to be extendable and contractible in the direction of the width of the traveling rail.

[0023] The invention described in claim 7 is characterized in that, in addition to the configuration of claim 4, the deck is supported by bridge girders arranged parallel to each other at intervals in the width direction of the bridge, the bogie rails that form the running track on which the transport bogie runs are laid directly above the bridge girders arranged on the inside, and the crane rails that form the running track for crane movement on which the gantry crane runs are laid directly above the bridge girders arranged on the outside in the width direction of the bridge girders on which the bogie rails are laid directly above.

[0024] The invention described in claim 8 is characterized in that, in a method for transporting components using a plurality of transport carts that move on a running track on a deck, a gantry crane is installed so as to straddle the running track, and an empty transport cart that is not loaded with components among the plurality of transport carts moving on the running track is lifted by the gantry crane from the running track to a position where it does not interfere with other transport carts on the running track, and in this state, the empty transport cart and the other transport carts on the running track are made to pass each other, and then the gantry crane returns the empty transport cart to the running track.

[0025] The feature of the invention described in claim 9 is that, in addition to the configuration of claim 8, one or more other transport carts traveling in the opposite direction to the empty transport cart are waited in a vertically arranged position ahead of the direction of travel of the empty transport cart, and the empty transport cart hoisted by the gantry crane is allowed to pass one or more other transport carts arranged in vertically arranged position, and then is returned to the running track behind the one or more other transport carts.

[0026] The invention described in claim 10 is characterized in that, in addition to the configuration of claim 8 or 9, the gantry crane is equipped with a self-propelled unit that can run on a crane movement running track that is arranged outside the deck width direction of the running track, and the empty transport cart and the other transport cart can be allowed to pass each other by the movement of the gantry crane with the empty transport cart hoisted up and the mutual movement of the gantry crane and the other transport cart.

[0027] The feature of the invention described in claim 11 is that, in addition to the configuration of claim 8 or 9, the empty transport cart is moved along the cross beam portion of the gantry crane to a position on the side of the traveling track where it does not interfere with other transport carts on the traveling track.

[0028] The feature of the invention described in claim 12 is that, in addition to the configuration of claim 11, the transport cart comprises a plurality of running units each having a beam-shaped arm supported on a plurality of running sections arranged at intervals in the width direction of the running track, and a loading platform section supported by the plurality of running units and having a width narrower than the width of the running track, and the running units are configured so that their position can be switched between a position where the plurality of running sections can move on the running track and a position where they are stored on the loading platform section side.

[0029] The invention described in claim 13 is characterized in that, in addition to the configuration of claim 8 or 9, the deck is supported by bridge girders arranged parallel to each other at intervals in the width direction of the bridge, the bogie rails that form the running track on which the transport bogie runs are laid directly above the bridge girders arranged on the inside, and the crane rails that form the running track for crane movement on which the gantry crane runs are laid directly above the bridge girder arranged on the outside in the width direction of the bridge girder on which the bogie rails are laid directly above.

[0030] The invention of claim 14 is characterized in that, in a method for removing a deck slab in a predetermined work area, an existing deck slab is divided into a plurality of existing deck slab members in the bridge axis direction and removed, a running track for moving a carriage to the work area is provided on the existing or new deck slab, and a gantry crane is installed midway along the running track so as to straddle the running track, the existing deck members are rotated in the work area so that their longitudinal direction faces the bridge axis direction, and the existing deck members are loaded onto a transport carriage on the running track with their longitudinal direction facing the bridge axis direction, and then the empty transport carriage is moved to the The system uses a gantry crane to lift the empty transport cart from the running track to a position where it does not interfere with the transport cart loaded with the existing deck slab member on the running track, and in this state, the empty transport cart and the transport cart loaded with the existing deck slab member on the running track are made to pass each other, and then the transport cart loaded with the existing deck slab member is moved on the running track in a direction away from the work area, and the empty transport cart is returned to the running track and moved to a position where the existing deck slab member can be loaded.

[0031] The feature of the invention described in claim 15 is that, in addition to the configuration of claim 14, the gantry crane is equipped with a self-propelled unit that can run on a crane movement running track arranged outside the deck width direction of the running track, and the empty transport cart and the transport cart loaded with the existing deck member can be allowed to pass each other by the movement of the gantry crane with the empty transport cart hoisted up and the mutual movement of the gantry crane and the transport cart loaded with the existing deck member.

[0032] The invention of claim 16 is characterized in that, in a method of constructing a deck, a plurality of deck precast members are transported to a predetermined work area, and the deck precast members are erected on a plurality of parallel bridge girders in a line in the bridge axis direction, a running track for a carriage to move to the work area is provided on an existing or new deck, and a gantry crane is installed midway along the running track so as to straddle the running track, a transport carriage loaded with the deck precast members is moved to the work area, the deck precast members are lifted from the transport carriage loaded with the deck precast members on the running track, and In the work area, the vehicle is rotated so that its longitudinal direction faces the bridge width direction, and the deck precast members are erected on the bridge girders. After that, the empty transport cart is lifted by the gantry crane from the running track to a position where it does not interfere with the subsequent transport cart on the running track that is loaded with the deck precast members. In this state, the empty transport cart and the subsequent transport cart on the running track are made to pass each other, and then the subsequent transport cart is moved toward the work area, and the empty transport cart is returned to the running track and moved in a direction away from the work area.

[0033] The invention described in claim 17 is characterized in that, in addition to the configuration of claim 16, the gantry crane is equipped with a self-propelled unit that can run on a crane movement running track that is arranged outside the deck width direction of the running track, and the empty transport cart and the subsequent transport cart can be made to pass each other by the movement of the gantry crane with the empty transport cart hoisted up and the mutual movement of the gantry crane and the subsequent transport cart.

[0034] The invention of claim 18 is characterized in that, in addition to the configuration of claim 16 or 17, transport carts loaded with the deck precast members are kept waiting in a vertical row, the deck precast members are lifted from the transport cart nearest to the work area and erected on the bridge girder, and then the empty transport cart is lifted from the running track by a gantry crane to a position on the running track where it does not interfere with the subsequent transport carts loaded with the deck precast members, the empty transport cart lifted by the gantry crane is made to pass one or more subsequent transport carts arranged in vertical row and moved relatively to the rearmost position of the one or more subsequent transport carts arranged in vertical row, and then the empty transport cart is returned to the running track behind the one or more subsequent transport carts and moved in a direction away from the work area. [Effects of the Invention]

[0035] By being equipped with the configuration described in claim 1, the component transport device of the present invention can efficiently move multiple transport carts back and forth even in cases where the usable width on the deck is limited due to road use or securing material storage space, and only a single-track running track can be provided, thereby reducing the waiting time associated with the movement of transport carts and shortening the construction period.

[0036] Furthermore, in the present invention, by providing the configuration described in claim 2, an empty transport cart suspended by a gantry crane and another transport cart can move in the passing direction, allowing the transport carts to pass each other smoothly.

[0037] Furthermore, in the present invention, by providing the configuration described in claim 3, even if the usable area in the vertical direction is restricted (airspace restriction) by transmission overhead lines or the like and there is a limit to the height of the gantry crane, the transport carts can be smoothly passed by each other by moving them to the side of the running track.

[0038] Furthermore, in the present invention, by providing the configurations set forth in claims 4 to 6, interference between the traveling unit and other transporting vehicles can be prevented, and transporting vehicles can pass each other smoothly.

[0039] Furthermore, in the present invention, by providing the configuration described in claim 7, the load of the equipment including the transport cart via the running track is not directly borne by the deck, and the problem that the running track for the transport cart must therefore be a single track can be solved.

[0040] By incorporating the configuration described in claim 8, the component transport method of the present invention can efficiently move multiple transport carts back and forth even in cases where the usable width on the deck is limited due to road use or securing material storage space, and only a single-track running track can be provided, thereby reducing the waiting time for work associated with the movement of transport carts.

[0041] Furthermore, in the present invention, by providing the configuration described in claim 9, multiple transport carts can pass each other even on a single track, so that while one transport cart is moving on the track, other work can be carried out continuously, eliminating the drawbacks of piston transport and realizing efficient work.

[0042] Furthermore, in the present invention, by providing the configuration described in claim 10, an empty transport cart suspended by a gantry crane and another transport cart can move in the passing direction, allowing the transport carts to pass each other smoothly.

[0043] Furthermore, in the present invention, by providing the configuration described in claim 11, even when the usable area in the vertical direction is restricted (airspace restriction) by transmission overhead lines or the like and the height of the gantry crane is also restricted, transport carts can be smoothly passed by each other by retreating to the side of the running track.

[0044] Furthermore, in the present invention, by providing the configuration described in claim 12, interference between the traveling unit and other transporting vehicles can be prevented, and the transporting vehicles can pass each other smoothly.

[0045] Furthermore, in the present invention, by providing the configuration described in claim 13, the load of the equipment including the transport cart via the running track is not directly borne by the deck, and the problem of having to arrange the running track for the transport cart as a single track can be solved.

[0046] By incorporating the configuration described in claim 14, the deck removal method of the present invention makes it possible to remove the existing deck efficiently without having to stop work due to piston transport.

[0047] Furthermore, in the present invention, by providing the configuration described in claim 15, the transporting carts can be smoothly replaced, and work can be carried out continuously.

[0048] By incorporating the configuration described in claim 16, the deck construction method of the present invention eliminates the need to stop work due to piston transport, and allows for efficient erection work of deck precast members.

[0049] Furthermore, in the present invention, by providing the configurations set forth in claims 17 and 18, the transporting carts can be smoothly replaced, and work can be carried out continuously. [Brief explanation of the drawings]

[0050] [Figure 1] 1A is a plan view showing an embodiment of a member transporting device according to the present invention, and FIG. 1B is a side view of the same. [Figure 2] FIG. 2 is a plan view showing an example of a gantry crane in FIG. [Figure 3] FIG. [Figure 4] FIG. [Figure 5]FIG. 2(a) is a plan view showing the state of the transport cart during travel, FIG. 2(b) is a side view of the same, and FIG. 2(c) is a front view of the same. [Figure 6] 1A is a plan view showing the state in which the traveling unit of the transporting cart is stored, FIG. 1B is a side view of the same, and FIG. 1C is a front view of the same. [Figure 7] 1A is a plan view showing the initial stage of a component transporting method and a deck slab removal method using the same according to the present invention, and FIG. 1B is a side view of the same. [Figure 8] 1A is a plan view showing the state in which the transport cart has been moved to a predetermined position, and FIG. 1B is a side view of the same. [Figure 9] (a) is a plan view showing the above-mentioned existing deck member being rotated and the empty transport cart being lifted by a gantry crane, and (b) is a side view of the same. [Figure 10] FIG. 10 is a front view showing the procedure for lifting the empty transport cart with a gantry crane. [Figure 11] 1(a) is a plan view showing the state of the work of loading the existing deck slab members onto a transport cart, and FIG. 1(b) is a side view of the same. [Figure 12] 1A is a plan view showing the state of the transport cart passing each other, and FIG. 1B is a side view of the same. [Figure 13] 1A is a plan view showing the state in which the empty transport cart has been returned to its original position, and FIG. 1B is a side view of the same. [Figure 14] (a) is a plan view showing the state of the transport cart in the component transporting method and deck construction method using the same according to the present invention, when it is moved to a predetermined position in the initial stage and the precast deck component is lifted, and (b) is a side view of the same. [Figure 15] 1(a) is a plan view showing the state of the rotating operation of the precast deck member of the same, and FIG. 1(b) is a side view of the same. [Figure 16] 1(a) is a plan view showing the empty transport cart being lifted by a gantry crane, and FIG. 1(b) is a side view of the same. [Figure 17] 1A is a plan view showing the state of the transport cart passing each other, and FIG. 1B is a side view of the same. [Figure 18](a) is a plan view showing the state when the empty transport cart is returned and the precast deck member is lifted from the following transport cart, and (b) is a side view of the same. DETAILED DESCRIPTION OF THE INVENTION

[0051] Next, an embodiment of a member transporting device according to the present invention will be described based on the embodiment shown in FIGS.

[0052] In this embodiment, the object to be transported is an existing deck component 30, 30... that has been divided when removing the existing deck in a bridge replacement project, or a deck precast component 31, 31... that will form a new deck. In the figure, the symbol 1 indicates a deck of a bridge, etc.

[0053] This bridge is designed so that materials are transported between the work area and the material transshipment location using transport carriages 2a to 2c from a location away from the work area (hereinafter referred to as the material transshipment location).

[0054] This component transport device using transport carts 2a to 2c is equipped with multiple transport carts 2a to 2c that move on a running track 3 installed on an existing or newly constructed deck, and these multiple transport carts 2a to 2c travel back and forth on the same running track 3 between the work area and the component transfer location, sequentially transporting components such as deck precast components 31, 31...

[0055] This transport device also has a gantry crane 5 positioned at some position on the running track 3 (in this embodiment, near the work area) so that its cross beam section 4 straddles the running track 3, allowing an empty transport cart 2a to pass other transport carts 2b, 2c loaded with parts, and allowing multiple transport carts 2a to 2c to travel back and forth on the single-track running track 3.

[0056] As shown in Figures 2 to 4, the gantry crane 5 comprises self-propelled units 7, 7 capable of running on a crane movement running track 6 arranged outside the width of the deck of the running track 3, a pair of support pillars 8, 8 supported by each self-propelled unit 7, 7, a cross beam 4 suspended across the upper ends of both support pillars 8, 8, and lifting means 9, 9 capable of lifting an empty transport cart 2a, so that the empty transport cart 2a moving on the running track 3 can be lifted and moved to a position where it does not interfere with the other transport carts 2b, 2c on the running track 3.

[0057] Furthermore, the height of the cross beam section 4 is set to be higher than the transport carts 2a to 2c loaded with components, and is set so that when an empty transport cart 2a to 2c is lifted, the empty transport cart is lifted to a certain height above the running track 3, allowing the transport carts 2a to 2c loaded with components to pass under the cross beam section 4.

[0058] The running track 3 is composed of a pair of bogie rails 3a, 3a arranged parallel to each other, with each bogie rail 3a, 3a laid directly above bridge girders 10a, 10a arranged inside the deck 1, and the running track 6 for crane movement is composed of a pair of crane rails 6a, 6a arranged parallel to each other, with each crane rail 6a, 6a laid directly above bridge girders 10b, 10b arranged on the outside of the bridge girder in the bridge width direction, with the running track 3 between them.

[0059] The self-propelled units 7, 7 are equipped with a plurality of wheels 11, 11 that can rotate on the crane rails 6a, 6a, and the wheels 11, 11 are driven by a motor 12 to move on the crane rails 6a, 6a. Note that reference numeral 13 in the figure denotes a power supply device for driving the motor 12.

[0060] The support columns 8, 8 have their lower ends fixed to the self-propelled units 7, 7 and are made up of a pair of diagonal column members 8a, 8a whose upper ends abut each other to form a truss structure. Reference numeral 8b denotes a reinforcing member bridged between the diagonal column members 8a, 8a.

[0061] The cross beam section 4 is formed in a frame shape by a pair of parallel beam members 14, 14 in the width direction of the bridge, made of I-beam or the like, with both ends supported by support columns 8, 8, and a plurality of connecting members 15, 15... that connect the upper surfaces of the beam members 14, 14, and a rail member 16 made of I-beam or the like is supported between the beam members 14, 14.

[0062] The lifting means 9,9 comprises a suspended moving section 9a that can move along a rail member 16, and an extendable lifting member 9b that hangs down from the moving section 9a, and is configured so that the lifting device 17 of the transport carts 2a to 2c can be connected to a connecting section 9c at the lower end of the lifting member 9b to lift it up.

[0063] As shown in Figures 5 and 6, the transport carts 2a to 2c are equipped with multiple (a pair in this embodiment) running units 20, 20 arranged at intervals in the three directions of the running track, and a loading platform 21 supported between the multiple running units 20, 20, and are capable of self-propelled forward and backward by the running units 20, 20.

[0064] The loading platform 21 is assembled in a ladder shape using a pair of longitudinal members 21a, 21a made of I-beam or the like and short connecting members 21b, 21b that connect the two longitudinal members 21a, 21a, and is formed into a rectangular shape in a plan view with a width narrower than the width of the running track 3, and is supported while placed on the arm portions 23 of the running units 20, 20.

[0065] Each of the running units 20, 20 has a plurality of (a pair in this embodiment) running sections 22, 22 that move on the running track 3, and a beam-shaped arm section 23 supported across the plurality of running sections 22, 22, and the loading platform section 21 is supported in an erected state on the arm section 23 of each of the running units 20, 20.

[0066] The travel units 20, 20 are configured so that the positions of the travel parts 22, 22 can be switched between a position where they are movable on the travel track 3 and a position where they are stored on the loading platform part 21 side.

[0067] In the mechanism for switching this position (hereinafter referred to as the switching mechanism), for example, arm portion 23 is placed under connecting member 21b at a predetermined position, and is connected to connecting member 21b via a rotation support member 24 such as a swivel, and the traveling units 20, 20 rotate relative to platform portion 21, thereby switching the position. Note that platform portion 21 and arm portion 23 can be fixed at each switching position with bolts, pins, or the like.

[0068] Furthermore, the switching mechanism is not limited to the above-mentioned rotary type, and although not specifically shown, for example, the arm portion 23 may have an extendable structure, and by extension, the running portions 22, 22 may be switched between a position where they can move on the running track 3 and a position where they are stored on the loading platform portion 21 side, or both ends of the arm portion 23 may be able to rotate horizontally.

[0069] In this way, the transport carts 2a to 2c are equipped with the above-mentioned switching mechanism, and are lifted by the gantry crane 5 and moved to the side of the running track, so that they can pass each other without interfering with the other transport carts 2b, 2c on the running track 3.

[0070] The running units 22, 22 are provided with a plurality of wheels 25, 25 that can rotate on the bogie rails 3 a, 3 a, and the wheels 25, 25 are driven by a motor 26 to move on the bogie rails 3 a, 3 a. Note that reference numeral 27 in the drawing denotes a power supply device for driving the motor 26.

[0071] Next, a method for transporting components using the component transport device as described above, as well as a method for removing and constructing a deck in bridge deck replacement work, will be described based on the embodiments shown in Figures 7 to 18. Note that the same components as those in the above-described embodiments will be described with the same reference numerals.

[0072] The bridge deck replacement work involves dividing the existing deck into multiple components (hereinafter referred to as existing deck components 30, 30...) in the bridge axis direction in a designated work area, and then transporting each existing deck component 30, 30... to a component transfer location using transport carts 2a to 2c to remove the deck.After that, multiple deck precast components 31, 31... are transported from the component transfer location to the work area, and multiple deck precast components 31, 31... that are long in the bridge width direction are erected in a line in the bridge axis direction on multiple bridge girders 10a, 10b that are arranged at intervals in the bridge width direction, and deck construction work is carried out; the components are transported between the work area and the component transfer location using this component transport device.

[0073] In addition, this deck replacement work involves starting the deck replacement work at one end of the bridge, setting up a component transfer location at the other end, and carrying out replacement work in a work area of ​​a specified span from the starting position, with the work area gradually moving toward the other end as the deck of the entire bridge is replaced.

[0074] The specific steps will be explained below.

[0075] First, the running track 3 and the running track 6 for crane movement are laid along the bridge axis on the deck connecting the work area and the component transfer area.

[0076] The deck 1 is supported by four bridge girders 10b, 10a, 10a, 10b arranged parallel to each other at intervals in the width direction of the bridge, and the bogie rails 3a, 3a that make up the running track 3 are laid directly above the bridge girders 10a, 10a that are arranged on the inside, respectively, and the crane rails 6a, 6a that make up the running track 6 for crane movement are laid directly above the bridge girders 10b, 10b that are arranged on the outside in the width direction of the bridge, so that the loads of the transport bogies 2a to 2c, the gantry crane 5, and the erection machine 32 described later are borne by the bridge girders 10a, 10b, so that the deck 1 is not directly burdened.

[0077] Next, as shown in Figure 7, the erection machine 32 and the gantry crane 5 are placed on the crane movement track 6, and the erection machine 32 is moved onto the work area at the work start position, while the gantry crane 5 is moved to a position near the work area (hereinafter referred to as the work area side material transfer position).

[0078] The erection machine 32 comprises running bodies 33 that move on the crane rails 6a, 6a, support pillars 34 supported by each running body 33, a rectangular frame 35 whose four corners are supported by each support pillar 34, 34, etc., and a crane unit 36 ​​supported by the frame 35 and movable in the bridge axis direction and the bridge width direction, and is installed in an arrangement spanning the work section in the bridge axis direction.

[0079] In addition, the crane unit 36 ​​can rotate the lifted members horizontally, so that members with their longitudinal direction aligned in the bridge width direction can now be oriented in the bridge axis direction, and conversely, members with their longitudinal direction aligned in the bridge axis direction can now be oriented in the bridge width direction.

[0080] Meanwhile, multiple empty transport carts 2a, 2b are placed on the traveling track 3, the leading transport cart 2a is moved to the work area side material transfer position, and the trailing empty transport cart 2b is made to wait in a vertical arrangement with the leading transport cart 2a.

[0081] Next, the existing deck slab in the work area is divided in the bridge axis direction into multiple existing deck slab members 30, 30..., and the existing deck members 30, 30... are removed one by one from the end (starting side) of the work area using an erection machine 32. Note that the existing deck members 30, 30... may be further divided in the bridge width direction (longitudinal direction) in consideration of workability, etc.

[0082] To remove the existing deck members 30, 30..., first, as shown in Figure 8, the crane unit 36 ​​of the erection machine 32 lifts up the existing deck members 30, 30..., with their longitudinal direction oriented in the bridge width direction, and moves them to the center position of the erection machine 32 in the bridge axis direction, then rotates them so that the longitudinal direction of the existing deck members 30, 30... is oriented in the bridge axis direction, and then moves them onto the loading platform 21 of the leading empty transport cart 2a waiting at the member transfer position on the work area side, and at that position the existing deck members 30, 30... are lowered onto the loading platform 21 and placed there (hereinafter referred to as member loading work).

[0083] Meanwhile, as shown in Figure 9, simultaneously with the loading work of the existing deck members 30, 30..., the gantry crane 5 is moved to the position of the following empty transport cart 2b and lifted from the running track 3 to a position where it will not interfere with the leading transport cart 2a on the running track 3.

[0084] Specifically, as shown in Figures 10(a) and (b), the transport cart 2b is lifted to a certain height by the lifting means 9,9 of the gantry crane 5, and then the running units 20,20 are rotated relative to the loading platform 21, and the multiple running units 22,22 are switched from a position where they can move on the running track 3 to a position where they are stored on the loading platform 21 side.

[0085] Then, as shown in Figure 10(c), in this state, the moving portion 9a of the lifting means 9,9 is moved along the rail member 16, and the empty transport cart 2b is moved along the cross beam portion 4 to a position where it does not interfere with other transport carts 2a on the row track beside the running track 3.

[0086] In this state, the trailing empty transport cart 2b hoisted by the gantry crane 5 is in a position where it does not interfere with the other transport carts 2a, so the leading transport cart 2a on the running track 3 loaded with the existing deck members 30, 30... and the empty transport cart 2b can pass each other, and the transport cart 2a loaded with the existing deck members 30, 30... is moved toward the component transfer location, and the gantry crane 5 hoisting the empty transport cart 2b is moved toward the work area, allowing the two transport carts 2a, 2b to pass each other (cart passing operation).

[0087] Furthermore, even if there are overhead restrictions due to overhead wires or the like and the height of the gantry crane 5 is also limited, the running sections 22, 22 of the running unit 20 can be stored on the loading platform section 21 side and the empty transport cart 2b can be moved to the side of the running track 3, allowing the two transport carts 2a, 2b to pass each other without interfering with each other.

[0088] Then, as shown in Figure 11, the lifting means 9,9 are moved along the cross beam section 4 in front of the work area, the empty transport cart 2b is moved onto the running track 3, the running units 20,20 are rotated relative to the loading platform section 21 suspended on the spot, the multiple running units 22,22 are switched from the position where they are stored on the loading platform section 21 side to a position where they can move on the running track 3, the empty transport cart 2b is returned onto the running track 3, and it is moved to the work area side material transfer position, and then it is made to wait in that position.

[0089] Then, the erection machine 32 performs the work of loading the next existing deck slab member 30, and the next existing deck slab member 30 is loaded onto the second transport cart 2b.

[0090] Meanwhile, the first transport cart 2a uses the time when loading work is being carried out on the next existing deck component 30 to move along the running track 3 to the component transfer location, and at the component transfer location, a crane or the like is used to transfer the components from the transport cart 2a to a transport vehicle such as a trailer.

[0091] Then, the empty transport cart 2a is moved again on the traveling track 3 to a position just before the work area, and then the gantry crane 5 is moved to the position of the empty transport cart 2a and lifted from the traveling track 3 to a position where it does not interfere with the leading transport cart 2b on the traveling track 3.

[0092] Then, the second transport cart 2b on the running track 3 loaded with the existing deck member 30 and the empty transport cart 2a are made to pass each other, and then the transport cart 2b loaded with the existing deck member 30 is moved on the running track 3 in the direction of leaving the work area, and the empty transport cart 2a is returned to the running track 3 and moved to a position where a new existing deck member 30 can be loaded and kept waiting.

[0093] Then, the transport carts 2a, 2b are repeatedly moved back and forth, the member loading work is carried out, and the transport carts 2a, 2b are allowed to pass each other, and all of the existing deck members 30, 30... divided into the work section are removed.

[0094] In this method of removing the deck, the transport carts 2a, 2b are allowed to pass each other using a gantry crane 5, so that the transport of the existing deck components 30, 30... by the transport carts 2a, 2b and the component transfer work by the erection machine 32 can be carried out simultaneously, which significantly reduces the time the erection machine 32 is down due to the transport of components compared to piston transport using a single transport cart.

[0095] Next, we will explain the deck construction method in which multiple deck precast members 31, 31... fabricated in advance in a factory are transported to a work area where the existing deck members 30, 30... have been removed, and the deck precast members 31, 31... are erected in a line in the bridge axis direction on multiple parallel bridge girders. Note that components similar to those in the above-mentioned embodiment are given the same reference numerals and their explanation will be omitted.

[0096] As in the case of removing the existing deck, the erection machine 32 is set up straddling the work area in the bridge axis direction, and the gantry crane 5 is positioned near the work area.

[0097] Meanwhile, multiple transport carts 2a to 2c are kept waiting at the component transfer location, and precast deck components 31, 31... that have been pre-fabricated in a factory are transported one after another to the component transfer location using trailers or the like, and the precast deck components 31, 31... are loaded onto the waiting transport carts 2a to 2c using a crane or the like, and the transport carts 2a to 2c that have completed loading are moved one after another along the running track 3 and transported to the front of the work area.

[0098] At this time, the deck precast members 31, 31... are placed and loaded on the loading platform 21 of the transport carts 2a to 2c with their longitudinal direction facing the direction of travel (bridge axis direction) so as not to impede transportation.

[0099] Then, as shown in Figure 14, multiple transport carts 2a to 2c loaded with deck precast members 31, 31... are arranged in a vertical line and are kept waiting, and the deck precast member 31 is lifted from the transport cart 2a closest to the work area and erected in a predetermined position on the bridge girders 10a, 10b.

[0100] Specifically, at the component transfer position, the deck precast component 31 is lifted from the loading platform 21 of the leading transport cart 2a by the crane unit 36 ​​of the erection machine 32, moved to the center position of the erection machine 32 in the bridge axis direction, and then rotated so that the longitudinal direction of the deck precast component 31 is aligned in the bridge width direction.The crane unit 36 ​​is then moved to above the erection position in the work area, and the deck precast component 31 is lowered at that position and erected on multiple bridge girders 10a, 10b that are parallel to each other (hereinafter referred to as component erection work).

[0101] Next, the empty transport cart 2a is moved under the gantry crane 5, and the gantry crane 5 lifts it from the running track 3 to a position where it will not interfere with the following transport carts 2b and 2c loaded with deck precast members 31 on the running track 3.

[0102] Specifically, as shown in Figure 10, after the empty transport cart 2a is lifted to a certain height by the lifting means 9,9 of the gantry crane 5, the running units 20,20 are rotated relative to the loading platform 21, and the multiple running units 22,22 are switched from a position where they can move on the running track 3 to a position where they are stored on the loading platform 21 side.

[0103] Then, in this state, the moving parts of the lifting means 9, 9 are moved along the rail member 16, and the empty transport cart 2a is moved along the cross beam part 4 to a position where it does not interfere with the other transport carts 2b, 2c on the row track beside the running track 3.

[0104] In this state, the empty transport cart 2a hoisted by the gantry crane 5 is in a position where it does not interfere with the following transport carts 2b, 2c arranged in a vertical row, so the following multiple transport carts 2b, 2c on the running track 3 loaded with deck precast members 31 and the empty transport cart 2a can pass each other, and the following multiple transport carts 2b, 2c loaded with deck precast members 31 are moved toward the work area, and the gantry crane 5 hoisting the empty transport cart 2a is moved in a direction away from the work area, allowing the two transport carts 2a to 2c to pass each other (cart passing operation).

[0105] Furthermore, even if there are overhead restrictions due to overhead wires or the like and there are also restrictions on the height of the gantry crane 5, by storing the running sections 22, 22 of the running unit 20 on the loading platform section 21 side and moving the empty transport cart 2a to the side of the running track 3, the empty transport cart 2a and the other transport carts 2b, 2c on the running track 3 can pass each other without interfering with each other.

[0106] Then, as shown in Figure 17, the empty transport cart 2a suspended from the gantry crane 5 is moved relative to the rear of the rearmost position of the multiple subsequent transport carts 2b, 2c arranged in a vertical row, and then, as shown in Figure 18, at that position, the lifting means 9, 9 are moved along the cross beam section 4, the empty transport cart 2a is moved onto the running track 3, the running units 20, 20 are rotated relative to the loading platform section 21 suspended in place, the multiple running units 22, 22 are switched from a position stored on the loading platform section 21 side to a position where they can move on the running track 3, and the empty transport cart 2a is returned to the running track 3.

[0107] Then, the empty transport cart 2a is moved along the travel track 3 to the component loading location, where a newly transported deck precast component 31 on a trailer or the like is loaded onto the empty transport cart 2a, and the deck precast component 31 is transported again toward the work area, where it waits at the rear of the other waiting transport carts 2c.

[0108] Meanwhile, in the work area, the empty transport cart 2a returns to the component loading location, and the time it takes to load the deck precast components 31 again and return to the vicinity of the work area is used to carry out the next component installation work on the transport cart 2b.

[0109] Then, the transport carts 2a to 2c move back and forth, component erection work is carried out, and the transport carts 2a to 2c pass each other repeatedly, and multiple deck precast components 31, 31... are erected in the work area in a line in the bridge axis direction, and each deck precast component 31, 31... is joined and, if necessary, prestressed to unite them.

[0110] In this deck construction method, the transport carts 2a to 2c are allowed to pass each other using a gantry crane 5, so that the transport of deck precast members 31, 31... by the transport carts 2a to 2c and the erection work of the members by the erection machine 32 can be carried out simultaneously, thereby significantly reducing the time that the erection machine 32 has to stop working while waiting for the transport carts 2a to 2c to pass by.

[0111] Then, when the deck replacement work for the work section is completed, the erection machine 32 and the gantry crane 5 are moved to the next work section, and the above-mentioned deck removal work and construction work are repeated.

[0112] With the component transport device configured in this manner and the component transport method using it, even if there is a limit to the bridge width and it is difficult to double the track 3 on which the transport carts 2a to 2c move, multiple transport carts 2a to 2c can travel in parallel with the component removal and installation work, allowing the work to be carried out smoothly and efficiently.

[0113] Furthermore, in this component transport device and the component transport method using it, the running sections 22, 22 of the running unit 20 are stored on the loading platform section 21 side, and the empty transport cart 2a is moved to the side of the running track 3, so that even if there are overhead restrictions due to overhead lines, etc., and there are also restrictions on the height of the gantry crane 5, the empty transport cart 2a and other transport carts 2b, 2c on the running track 3 can pass each other without interfering with each other.

[0114] In the above-mentioned embodiment, the transporting carts 2a to 2c and the gantry crane 5 are described as moving on rails that make up the traveling track 3 (traveling track 6 for crane movement), but the traveling track 3 is not necessarily limited to being made up of rails, and may also include, for example, a traveling path in which plastic tires are used for the traveling units 20, 20 and the self-propelled units 7, 7, and the plastic tires move directly on the deck slab.

[0115] In the above embodiment, the case where an empty transport cart is moved to the side of the travel track by a gantry crane has been described, but if there is no height restriction, the cross beam of the gantry crane may be set at a high position, and the empty transport cart hoisted by the gantry crane may be lifted to a higher position than other transport carts loaded with materials, and the empty transport cart hoisted by the gantry crane may pass other transport carts on the travel track above and below. In this case, it is not necessary to store the traveling unit of the transport cart.

[0116] Furthermore, in this embodiment, the transport objects of the component transporting device and component transporting method have been described as existing deck components 30, 30... and deck precast components 31, 31... that constitute the deck of a bridge, but the components are not limited to these, and there are no restrictions on the use, size, material, etc., as long as there is no interference between transport carts 2a to 2c loaded with components and empty transport carts 2a to 2c when they pass each other. [Explanation of symbols]

[0117] 1 floor slab 2 Transport cart 3 Running track 4 Cross beam section 5 Gantry crane 6 Crane movement track 7 Self-propelled units 8 Support section 9 Lifting means 10 Bridge girders 11 wheels 12 motors 13 Power supply 14 Beam member 15 Connecting member 16 Rail components 17 Lifting equipment 20 Traveling unit 21 Cargo area 22 Running part 23 Arm section 24 Rotation support member 25 wheels 26 Motor 27 Power supply 30 Existing deck members 31 Precast deck members 32 Erection machine 33 Running body 34 Pillar section 35 frames 36 Crane Unit

Claims

1. A component transport device equipped with a plurality of transport carriages that move along a track on a deck, A gantry crane is provided with a cross beam portion arranged to straddle the traveling track, The gantry crane is provided with a lifting means for lifting an empty transport vehicle traveling on the traveling track and moving it to a position where it does not interfere with other transport vehicles on the traveling track, A member transporting device characterized in that the empty transporting cart and other transporting carts can pass each other.

2. 2. A member transport device according to claim 1, wherein the gantry crane is provided with a self-propelled unit capable of traveling on a crane travel track arranged outside the travel track in the deck width direction.

3. 3. A component transport device as described in claim 1 or 2, wherein the lifting means is movably supported along the cross beam portion of the gantry crane, and is capable of moving the empty transport cart to a position on the side of the running track where it does not interfere with other transport carts on the running track.

4. The transport vehicle includes a plurality of traveling units each having a beam-shaped arm supported on a plurality of traveling sections arranged at intervals in the width direction of the traveling track, and a loading platform supported by the plurality of traveling units and having a width narrower than the width of the traveling track, 4. The member transporting device according to claim 3, wherein the travel unit is switchable between a position where the plurality of travel sections are movable on the travel track and a position where the travel sections are stored on the loading platform side.

5. 5. The member transporting device according to claim 4, wherein the arm portion and the platform portion of the traveling unit are rotatably connected to each other.

6. 5. A member transporting device according to claim 4, wherein the traveling unit has an arm that extends and contracts in the direction of the width of the traveling rail.

7. The deck is supported by bridge girders arranged in parallel at intervals in the bridge width direction, A carriage rail constituting a running track on which the transport carriage runs is laid directly above the bridge girder arranged on the inside, 5. A component transport device as described in claim 4, wherein the crane rails constituting the crane travel track on which the gantry crane travels are laid directly above the bridge girder positioned outside the bridge width direction of the bridge girder on which the bogie rails are laid directly above.

8. A component transport method for transporting components using a plurality of transport carriages that move along a track on a deck, comprising: A gantry crane is installed so as to straddle the travel track, lifting an empty transport cart that is not loaded with any components from among the plurality of transport carts moving on the traveling track by the gantry crane from the traveling track to a position where it does not interfere with other transport carts on the traveling track; In this state, the empty transport vehicle and the other transport vehicle on the traveling track are allowed to pass each other, Thereafter, the gantry crane returns the empty transport cart to the travel track.

9. A method for transporting components as described in claim 8, wherein one or more other transport carts traveling in the opposite direction to the empty transport cart are arranged in a vertical line and wait in front of the direction of travel of the empty transport cart, and the empty transport cart hoisted by the gantry crane is allowed to pass one or more other transport carts arranged in a vertical line, and then is returned to the running track behind the one or more other transport carts.

10. A method for transporting components as described in claim 8 or 9, wherein the gantry crane is equipped with a self-propelled unit capable of running on a crane movement running track arranged outside the deck width direction of the running track, and the empty transport cart and the other transport cart are allowed to pass each other by moving the gantry crane with the empty transport cart hoisted up and by moving the gantry crane and the other transport cart relative to each other.

11. A method for transporting components as described in claim 8 or 9, wherein the empty transport cart is moved along the cross beam portion of the gantry crane to a position on the side of the running track where it does not interfere with other transport carts on the running track.

12. The transport vehicle includes a plurality of traveling units each having a beam-shaped arm supported on a plurality of traveling sections arranged at intervals in the width direction of the traveling track, and a loading platform supported by the plurality of traveling units and having a width narrower than the width of the traveling track, The member transport method according to claim 11, wherein the travel unit is configured to be switchable between a position where the plurality of travel sections are movable on the travel track and a position where the travel sections are stored on the loading platform side.

13. The deck is supported by bridge girders arranged in parallel at intervals in the bridge width direction, A carriage rail constituting a running track on which the transport carriage runs is laid directly above the bridge girder arranged on the inside, A method for transporting components as described in claim 8 or 9, wherein the crane rails constituting the crane travel track on which the gantry crane travels are laid directly above the bridge girder positioned outside the bridge width direction of the bridge girder on which the bogie rails are laid directly above.

14. A method for removing a deck in a predetermined work area by dividing the existing deck into multiple existing deck components in the bridge axis direction and removing them, A traveling track for moving a carriage to the work area is provided on the existing or new deck, and a gantry crane is installed midway along the traveling track so as to straddle the traveling track, The existing deck member is rotated in the work area so that its longitudinal direction faces the bridge axis direction, and is loaded onto a transport cart on the running track with its longitudinal direction facing the bridge axis direction, An empty transport cart is lifted by the gantry crane from the traveling track to a position where it does not interfere with the transport cart on the traveling track that is loaded with the existing deck slab member, and in this state, the empty transport cart and the transport cart on the traveling track that is loaded with the existing deck slab member are made to pass each other, Thereafter, the transport cart loaded with the existing deck component is moved on the running track in a direction away from the work area, and the empty transport cart is returned to the running track and moved to a position where the existing deck component can be loaded.This is a method of removing a deck, characterized by the above.

15. A method for removing a deck as described in claim 14, wherein the gantry crane is equipped with a self-propelled unit capable of running on a running track for crane movement arranged outside the deck width direction of the running track, and the empty transport cart and the transport cart loaded with the existing deck member are allowed to pass each other by moving the gantry crane with the empty transport cart hoisted up and by moving the gantry crane and the transport cart loaded with the existing deck member relative to each other.

16. A method for constructing a deck in which a plurality of deck precast members are transported to a predetermined work area and the deck precast members are erected in a line in the bridge axis direction on a plurality of parallel bridge girders, A traveling track for moving a carriage to the work area is provided on the existing or new deck, and a gantry crane is installed midway along the traveling track so as to straddle the traveling track, A transport cart loaded with the deck precast members is moved to the work area, the deck precast members are lifted from the transport cart loaded with the deck precast members on the running track, and rotated in the work area so that the longitudinal direction faces the bridge width direction, and the deck precast members are erected on the bridge girder, The gantry crane lifts an empty transport cart from the traveling track to a position where it does not interfere with a subsequent transport cart on the traveling track that is loaded with the deck precast members, and in that state, the empty transport cart and the subsequent transport cart on the traveling track are allowed to pass each other, Thereafter, the following transport cart is moved toward the work area, and the empty transport cart is returned to the running track and moved in a direction away from the work area.

17. A method for constructing a deck as described in claim 16, wherein the gantry crane is equipped with a self-propelled unit capable of running on a crane movement running track arranged outside the deck width direction of the running track, and the empty transport cart and the trailing transport cart are allowed to pass each other by moving the gantry crane with the empty transport cart hoisted up and by moving the gantry crane and the trailing transport cart relative to each other.

18. Transport carts loaded with the deck precast members are arranged in a vertical line and on standby, the deck precast members are lifted from the transport cart nearest to the work area and erected on the bridge girder, and then the empty transport cart is lifted from the running track by a gantry crane to a position that does not interfere with the subsequent transport carts loaded with the deck precast members on the running track, The empty transport cart hoisted by the gantry crane is caused to pass one or more of the subsequent transport carts arranged in tandem, and is relatively moved to the rearmost position of the one or more subsequent transport carts arranged in tandem, A method for constructing a deck as described in claim 16 or 17, wherein the empty transport cart is then returned to the running track behind the one or more following transport carts and moved in a direction away from the work area.

Images