JP7570481B2 - Method for moving heavy objects using a heavy object moving device and a heavy object moving device - Google Patents

Description

The present invention relates to a method for moving a heavy object using a heavy object moving device for lifting and moving the heavy object, and to a heavy object moving device.

In a conventional bridge deck replacement method for replacing an existing deck installed on an I-shaped main girder with a new deck, when removing the existing deck, the existing deck is first cut into a shape that can be loaded onto the bed of a transport vehicle. Then, the cut piece of the existing deck is lifted up by a lifting device such as a crane and moved to the bed of the transport vehicle.

In this situation, Patent Document 1 discloses a method for removing a removal member, which is a part of an existing deck, by using an erection girder type lifting device. The erection girder type lifting device is a device that is assembled at the construction site. First, a lifter that supports the four corners of a rectangular platform in plan view with four pillars is lifted up by two lifters.
These are then loaded one by one onto the bed of a truck and transported to the construction site.
The lifters of the platform are arranged at intervals with the removal member in between, the erection girder is installed so as to span across each of the lifter platforms, and a lifting mechanism is installed on the erection girder so as to be capable of moving laterally.

The member to be removed, which is part of the existing deck, is lifted up via the lifting mechanism of the erection girder-type lifting device thus assembled, and removed from the road bridge, and the lifting mechanism is moved lateral along the erection girder while suspending the member to be removed. Meanwhile, a transport vehicle is driven under the platform of one of the two lifters, and when the lifting mechanism has moved along the erection girder to the bottom of the platform, the member to be removed that is suspended by the lifting mechanism is lowered onto the bed of the transport vehicle.

JP 2018-204427 A

The erection girder-type lifting device described in Patent Document 1 utilizes a lifter, which is a common device available on the market, and is assembled so that an erection girder equipped with a load-lifting mechanism is suspended across it, making it possible to carry out the removal work of the parts to be removed while eliminating the effort and cost of producing dedicated equipment.

However, as mentioned above, the lifter has a shape in which the four corners of a rectangular platform in plan view are supported by four pillars, and if two lifters are installed with the removal member in between, a total of eight pillars are required to install the lifter. As a result, the area occupied by the erection girder type lifting device at the construction site becomes large, and depending on the construction site, it may be difficult to secure the installation space.

In addition, the assembly work of setting up two lifters at the construction site and hanging the erection girders equipped with lifting mechanisms on them is complicated, and multiple freight trucks are required to transport these to the construction site, which increases the need to secure space for these freight trucks to park and the cost of transportation, creating issues in terms of construction time, construction costs, and workability.

The present invention has been made in consideration of such problems, and its main objective is to provide a method for moving heavy objects using a heavy object moving device that is easy to transport to and from a construction site and can be easily installed at a construction site.

In order to achieve this object, the method of moving a heavy object using the heavy object moving device of the present invention is a method of lifting and moving a heavy object using a heavy object moving device comprising a transverse rail, a pair of portal frames provided opposite each other near both ends of the transverse rail, and a lifting mechanism running along the transverse rail, the portal frames comprising a pair of support pillars that are extendable in the height direction and a connecting beam that connects the upper ends of the support pillars together and is extendable in the longitudinal direction, the method comprising the steps of: unfolding and installing the portal frames with the support pillars and the connecting beams shortened;
The method includes the steps of: lifting and moving the heavy load by running the lifting mechanism, with the heavy load suspended, along the lateral rail; and minimizing the unfolded portal frame by shortening both the support pillars and the connecting beams.

In addition, the heavy object moving device of the present invention is a heavy object moving device comprising a transverse rail, a pair of portal frames arranged opposite each other near both ends of the transverse rail, and a lifting mechanism running along the transverse rail, wherein the portal frame has a pair of pillars that are extendable and contractable in the height direction, and a connecting beam that connects the upper ends of the pillars and is extendable and contractable in the longitudinal direction.

According to the method for moving a heavy object using the heavy object moving device and the heavy object moving device of the present invention, the portal frame is composed of a pair of support pillars that are expandable in the height direction, and a connecting beam that connects the upper ends of the support pillars and is expandable in the longitudinal direction. By setting the minimum length of the support pillars to a height that allows road traffic when loaded onto a trailer, and setting the minimum length of the connecting beam to a length that allows the pair of support pillars to be connected at an interval that fits within the width of the trailer, the heavy object moving device can be loaded onto a trailer without disassembly and transported to and from the construction site.

On the other hand, when lifting heavy objects, the structure can be transported to the construction site by trailer and then the pillars and connecting beams can be extended to expand the portal frame to the desired size, without the need for assembly work, and then it can be installed.

Therefore, there is no need to carry out assembly and disassembly work every time the heavy object moving device is brought in and out of the construction site, and workability can be significantly improved. In addition, since it can be carried in and out with one trailer, transportation costs can be reduced compared to when multiple transport vehicles are required, which contributes to shortening the construction period and reducing the construction costs.

Furthermore, while the conventional technology requires space to install two lifters, which are common devices available on the market, for a total of eight support columns, the present invention requires only four support columns in total because the portal frame has a structure with two support columns, making it possible to install the device in a small space. Also, when installing the heavy load moving device at the construction site, the support columns and connecting beams of the portal frame can be extended and deployed to the desired length, making it possible to ensure the desired size of the inner space that will be the work area.

The heavy object moving device of the present invention is characterized in that one end of the lateral rail is arranged to protrude outward from a pair of opposing gate-shaped frames, and a loading hoist is provided at one end of the lateral rail.

According to the heavy load moving device of the present invention, since a loading hoist is provided at one end of the transverse rail, the lifting mechanism that has lifted the heavy load can be made to travel along the transverse rail, and after the heavy load is moved to one end of the transverse rail, it can be transferred to the loading hoist and lifted again. This makes it possible to load a heavy load onto a transport vehicle using the loading hoist, while using the lifting mechanism to move a new heavy load, thereby making it possible to significantly improve work efficiency.

The heavy object moving device of the present invention is characterized in that a side panel is provided on a side surface parallel to the lateral travel rail.

According to the heavy object moving device of the present invention, the side panel functions as a protector for the work area set in the inner space. Therefore, when the heavy object moving device is applied to road construction, for example, it is possible to improve the safety of the work even if the road construction progresses in the work area of the inner space while ordinary vehicles pass beside the heavy object moving device.

The heavy load moving device of the present invention is characterized in that the lifting mechanism is equipped with a deck removal device that pulls off the existing deck from the main girder of the bridge.

According to the heavy load moving device of the present invention, since the deck removal device is supported by the lifting mechanism, when removing the existing deck from the main girder of the bridge, the cut piece cut so as to be loadable on a transport vehicle is peeled off from the main girder using the deck removal device and removed. Next, the cut piece and the deck removal device are lifted by the lifting mechanism, and the lifting machine is made to travel along the lateral rail to move the cut piece together with the deck removal device. After that, the cut piece can be removed from the deck removal device and transported from the construction site.

This allows the heavy load moving device to be used for a series of tasks from removing the cut pieces to transporting them away, greatly improving work efficiency. In addition, because the deck removal device can be supported by the lifting mechanism at all times, a temporary storage area for the deck removal device is not required, making it possible to secure a large work area.

According to the present invention, a pair of gate-shaped frames provided near both ends of the cross rail are composed of a pair of pillars that are flexible in the height direction and a connecting beam that is flexible in the longitudinal direction. Therefore, by forming the pillars and connecting beams in their shortest length to a size that can be loaded onto a trailer, the heavy object moving device can be loaded onto a trailer and transported to and from the construction site. Furthermore, since there is no need to perform assembly and disassembly work every time the device is transported, it is possible to easily transport it to and from the construction site and to install it.

FIG. 1 is a diagram showing a state in which a heavy object moving device according to an embodiment of the present invention is loaded onto a trailer. FIG. 2 is a diagram showing the rear face of the weight moving device according to the embodiment of the present invention. 1 is a diagram showing a side cross section (cross section AA) of a weight object moving device according to an embodiment of the present invention. FIG. 2 is a diagram showing a lifting mechanism according to an embodiment of the present invention. 1 is a diagram showing a swivel rail and a swivel trolley according to an embodiment of the present invention. FIG. FIG. 2 is a diagram showing a deck slab removal device according to an embodiment of the present invention. FIG. 1 is a diagram showing the procedure for removing and moving a cut piece of an existing deck from the main girder using a heavy object moving device in an embodiment of the present invention (part 1). FIG. 2 is a diagram showing the procedure for removing and moving a cut piece of an existing deck from the main girder using a heavy object moving device in an embodiment of the present invention (part 2). 13A to 13C are diagrams showing the procedure for placing a new deck piece in the space left after the cut piece of the existing deck has been removed using a heavy object moving device in an embodiment of the present invention.

The heavy load moving device of the present invention is a device for lifting and moving heavy loads, and has a structure that can be loaded onto a trailer and can be deployed to a desired height and width at a construction site. In this embodiment, an example is given of a case in which the heavy load moving device is applied to a bridge deck replacement method in which an existing deck installed on an I-shaped main girder of a road bridge is replaced with a new deck, and the details are described below.

In the deck replacement method, when replacing the existing deck with a new deck, the existing deck is cut into pieces large enough to be loaded onto the bed of a transport vehicle, and the heavy object moving device moves these cut pieces from the main girder and loads them onto the transport vehicle.

≪≪Heavy object moving device≫≫
As shown in Figs. 1(a) and 1(b), the size of the heavy object moving device 100 is the same as that of a trailer T.
As shown in FIG. 2, the telescopic frame mechanism 10 has a pair of gate-shaped frames 12 and a structure that can be adjusted to a length L, width W, and height H that can be loaded on the vehicle. The deck is equipped with a lifting mechanism 20 that moves along a lateral rail 11 that is suspended between the deck and the deck, and a deck removal device 30 that is installed on the lifting mechanism 20.

<Extendable frame mechanism>
As shown in FIG. 2 and FIG. 3, the telescopic frame mechanism 10 includes a pair of portal frames 12, a pair of connecting trusses 15 connecting the portal frames 12 to each other, and two horizontal rails 11 arranged in parallel to the connecting trusses 15. As shown in FIG. 2, the portal frames 12 include a pair of support columns 13 arranged at a distance from each other, and a connecting beam 11 connecting the vicinity of the upper ends of the pair of support columns 13.
4.

While any lifting device having an extension mechanism may be used as the support 13, in this embodiment, a hydraulic jack is used and is arranged so that a cylinder 131 is located at the top and a piston rod 132 is located at the bottom, as shown in Fig. 2. The minimum length of the support 13 is set to a height H that allows traffic on the road when it is loaded onto a trailer T, as shown in Fig. 1(b).

As shown in FIG. 2, the connecting beam 14 is provided with a telescopic mechanism at both ends that allows the length to be adjusted, and the shortest length is set to a length that allows a pair of supports 13 to be connected at an interval that fits within the width W that can be loaded onto a trailer T, as shown in FIG. 1(b).

2, brace materials 121 are provided to reinforce the connections between the support columns 13 and the connecting beams 14. The brace materials 121 are made of expansion devices such as screw-type expansion members or hydraulic jacks so as to follow the portal frame 12 when it is unfolded as described above, and both ends of the brace materials 121 are rotatably connected to the support columns 13 and the connecting beams 14.

The connecting truss 15 connects a pair of portal frames 12 arranged in parallel at an interval shorter than the length L that can be loaded onto the trailer T, and as shown in Fig. 2, two of them are arranged in parallel at the same interval as the pair of support columns 13 that make up the portal frame 12. Then, between the two connecting trusses 15, two lateral rails 11 are arranged in parallel with them at a specified interval.

3, the two lateral rails 11 are each installed near both ends on the underside of the connecting beam 14 so as to span the pair of portal frames 12. The length of each lateral rail 11 is longer than the connecting truss 15 and is formed to a length L that allows the rail to be loaded onto a trailer T at the maximum, with both ends protruding outward from the space formed between the pair of portal frames 12. Two loading hoists 112 are disposed adjacent to one end of each lateral rail 11, and a chain block 111 is installed at the other end.

The loading hoist 112 lifts the cut pieces P, which have been moved by the lifting mechanism 20 (described later), in the direction of the loader 112.
As shown in Fig. 1B, this is used when loading onto a transport vehicle C, and two are installed to span the lateral rails 11. Also, a total of two chain blocks 111 are installed as auxiliary lifting mechanisms, one on each lateral rail 11, but this is not necessarily required.

A lateral trolley 21 of a lifting mechanism 20 runs on each of the two lateral rails 11, which are formed from a steel material having an I-shaped cross section, with the lower flange serving as the rail.

<Lifting mechanism>
As shown in Figs. 4(a) and (b), the lifting mechanism 20 includes a transverse trolley 21 that runs along the lower flange of the transverse rail 11, a perpendicular rail 22 that is suspended by the transverse trolley 21, and
The vehicle is provided with an orthogonal trolley 23 that runs along the orthogonal rail 22 and a swivel rail 24 that is supported by the orthogonal trolley 23.

Two traverse trolleys 21 are provided for one traverse rail 11 with a gap therebetween, so that a total of four traverse trolleys 21 run synchronously along the two traverse rails 11. Two orthogonal rails 22 suspended from these traverse trolleys 21 extend with a gap therebetween in a direction perpendicular to the traverse rail 11. Two orthogonal trolleys 23 are provided for one orthogonal rail 22 with a gap therebetween, so that a total of four traverse trolleys 23 run synchronously along the two orthogonal rails 22.

As shown in Fig. 4 and Fig. 5, the turning rail 24 is a rail that is circular in plan view and is supported by four orthogonal trolleys 23. As described above, the four orthogonal trolleys 23 are connected to the traverse trolley 21.
Since the swivel rail 24 runs along the orthogonal rail 22 suspended from the frame 10, the position of the swivel rail 24 in a plan view relative to the telescopic frame mechanism 10 can be adjusted by moving it in the extension direction of the lateral rail 11 and the extension direction of the orthogonal rail 22, as shown in FIG.

The lifting mechanism 20 further includes a swivel trolley 25 that runs along the swivel rail 24 and a lifting hoist 26 that is provided on the swivel trolley 25 .

As shown in FIG. 5, four swivel trolleys 25 are installed at 45 degree intervals with respect to the swivel rail 24 in a plan view, and adjacent swivel trolleys 25 are connected to each other via connecting members 251. As a result, the swivel trolleys 25 are always moved around the swivel rail 24 while maintaining a 45 degree interval.
Run on 4.

As shown in Figures 4(a) and 4(b), the lifting hoist 26 is installed on each of the four swivel trolleys 25, so that a total of four lifting hoists are installed on the lifting mechanism 20.
Although heavy objects can also be lifted by lifting hoist 6, in this embodiment, as shown in Figure 3, a deck slab removal device 30 is suspendingly used by lifting hoist 26, and a cut piece P of the existing deck cut on road bridge B is removed from main girder D via this deck slab removal device 30.

<Deck removal device>
The deck removal device 30 is a device for pulling off a cut piece P from a main girder D of a road bridge B.
As shown in (a) and (b), a frame 33 is formed by a pair of vertical members 31 and a pair of horizontal members 32, a load anchor member 34 and a reaction jack 35 are installed on the frame 33,
and a hanging jig 36.

Both the vertical member 31 and the horizontal member 32 are formed as long steel members each consisting of a pair of channel steel members, and by placing the webs of the channel steel members back-to-back with a gap between them, a gap is formed in the center of the long steel member parallel to the axis.

As shown in FIG. 6( a ), the frame 33 is made up of a pair of horizontal members 32 arranged at a distance from each other,
On the upper surface of the vertical members 31, a pair of vertical members 31 are arranged at a distance from each other, forming a grid shape in a plan view. At this time, the vertical members 31 and the horizontal members 32 are both arranged in a posture in which the gaps between the long steel materials penetrate the vertical direction.

The load anchor members 34 are disposed at four locations on the frame 33 where the horizontal members 32 and the vertical members 31 overlap, and as shown in FIG. 6( c ), when the anchor rod 341 penetrates the frame 33, the head of the anchor rod 341 is fixed to the top surface of the vertical members 31 via the anchor plate 342 and the head nut 34.
3. The tip of the anchor rod 341 passes through the cut piece P and is fixed to the underside thereof by a tip nut 344. This allows the cut piece P to be connected to the frame 33 via the load anchor member 34.

As shown in FIG. 6(a), the reaction jacks 35 are disposed at both ends of the cross members 32, which are the four corners of the frame 33. As shown in FIG. 6(c), the reaction jacks 35 are disposed at both ends of the cross members 32, which are the four corners of the frame 33.
The cylinder 352 is fitted inside the cross member 32 so that it protrudes downward from the lower surface of the cross member 32 .

Here, as shown in Figures 6(b) and (c), the cross member 32 in the frame 33 has notches 331 provided on its underside near both ends where the piston rod 351 of the reaction jack 35 is located, and is shaped so that when the reaction jack 35 is fully retracted, the pressing surface of the piston rod 351 does not protrude from the underside of the frame 33.

6(b), the frame 33 can be stacked on the upper surface of the cut piece P without being hindered by the piston rod 351 of the reaction jack 35. In this state, when the cut piece P and the frame 33 are connected and the reaction jack 35 is extended, the piston rod 351 presses against the periphery of the cut piece P to be removed.

6(c), the frame 33 rises while peeling off the cut piece P, the lower surface of which is fixed to the main girder D of the road bridge B, from the main girder D. In this way, it becomes possible to remove the cut piece P from the main girder D of the road bridge B.

The deck removal device 30 has a lifting jig 36 installed on the upper surface of the frame 33 , and is lifted together with the cut piece P by the lifting hoist 26 via this lifting jig 36 .

3, the heavy load moving device 100 configured as described above employs a truss structure 16 for reinforcement on the side of the extendable frame mechanism 10, that is, the surface surrounded by the connecting truss 15 and the columns 13 connected by this connecting truss 15, and is also provided with a side panel 17. This side panel 17 functions as a protector for the work area provided in the internal space of the extendable frame mechanism 10.

Therefore, when removing and moving the cut pieces P of the existing deck from the main girder D in the bridge deck replacement method, it is possible to progress the work in the work area inside the telescopic frame mechanism 10 while allowing general vehicles to pass beside the heavy load moving device 100. Note that since both the truss structure 16 and the side panel 17 are provided within the height range of the cylinder 131 of the support 13,
It does not inhibit the elongation or shortening behavior of 3.

As shown in FIG. 1, the side panel 17 is arranged so that either the driver's side or the passenger's side when the vehicle is placed on the trailer 7 is set to cover the entire height range of the cylinder 131, and the other side is set to cover the entire height range of the cylinder 131.
It is advisable to provide a notch 171 on the lower end side. This is suitable when applying to a half-section deck replacement method in which half sections are replaced at a time, rather than a method in which the replacement work of the existing deck is performed on the entire step surface (entire cross section).

The half-section deck replacement method is a method in which, for example, lane restrictions are implemented on a two-lane road bridge B having a passing lane and a driving lane, and a half-section, i.e., one of the half-sections, i.e., the driving lane side or the passing lane side of the concrete deck 202, is replaced with a new deck, and around the same time, the half-section on the other side is also replaced with a new deck.

When applied to this half-section deck replacement method, of the parapets H provided on each side of the road bridge B, as shown in Figure 2, a cut-off piece P of the existing deck, one of which remains installed, can be taken into a work area set up in the inner space of the telescopic frame mechanism 10 by utilizing the notch 171 in the side panel 17, and removal work can be carried out.

On the other hand, the side where the side panel 17 is provided over the entire height range of the cylinder 131 can prevent equipment or cut pieces P from flying out of the work area due to an unexpected incident. Therefore, by utilizing the side panel 17 with the cutout 171, the work of removing the cut pieces P can be performed in the work area inside the telescopic frame mechanism 10, while general vehicles can be safely used outside the side where the side panel 17 is provided over the entire height range of the cylinder 131.

<<Method for moving a heavy object using a heavy object moving device>>
The method of moving a heavy load using the above-mentioned heavy load moving device 100 will be described with reference to the above-mentioned bridge half-section deck replacement construction method, in which a cut piece P of an existing deck is removed from a main girder D and moved, and a new deck piece N temporarily placed at the construction site is placed at the site where the cut piece P was removed and moved.
The procedure is explained below. The cut piece P, which is a heavy object, is placed in the following position as shown in FIG.
While installed on the main girder D of the road bridge B, it is pre-cut to a size that can be loaded onto the bed of a transport vehicle C.

<When removing and moving the cut pieces P of the existing deck and transporting them from the construction site>
First, as shown in FIG. 1, the gate-shaped frame 1 is assembled without disassembling the heavy load moving device 100.
The supports 13 and connecting beams 14 of the road bridge B2 are loaded onto the trailer T in the shortest possible state.
Transported to the construction site above.

Next, as shown in FIG. 7A, the heavy load moving device 100 is moved to a position straddling the cut piece P to be removed, with the lateral rail 11 provided on the telescopic frame mechanism 10 facing the bridge axis direction of the road bridge B.
The trailer T carrying the load is stopped. Then, the support columns 13 and connecting beams 14 of the portal frame 12 are appropriately extended to expand the telescopic frame mechanism 10 of the heavy load moving device 100 to the desired size, and the device is installed at a specified position on the road bridge B, while the trailer T is withdrawn. Before, during, or at the same time as this work, the deck removal device 30 is installed on the lifting hoist 26 of the lifting mechanism 20.

After this, the lateral trolley 21 is made to run along the lateral rail 11 to move the lifting mechanism 20 in the bridge axis direction, and if necessary, the orthogonal trolley 23 is made to run along the orthogonal rail 22 to further move the lifting mechanism 20 in a direction perpendicular to the bridge axis, and the deck removal device 30 supported by the lifting mechanism 20 is positioned above the cut piece P to be removed.

After the deck slab removal device 30 has been aligned in this manner, as shown in Fig. 7(b), the deck slab removal device 30 is suspended using the lifting hoist 26 of the lifting mechanism 20 and stacked on the upper surface of the cut piece P. Then, the cut piece P is connected to the frame 33 of the deck slab removal device 30 using the hoisting anchor members 34 of the deck slab removal device 30.

An anchor insertion hole (not shown) is provided in advance in the cut piece P, and as shown in Fig. 6(b) , the anchor rod 341 of the load anchor member 34 is passed through this anchor insertion hole and fixed to the underside of the cut piece P with a tip nut 334. Meanwhile, the head of the anchor rod 341 is fixed to the upper surface of the frame 33 with a head nut 333 via an anchor plate 342.

After that, as shown in FIG. 6(c), the reaction jack 35 of the deck removal device 30 is extended, and the lower surface of the piston rod 351 presses against the periphery of the cut piece P, causing the cut piece P to rise together with the frame 33, and the cut piece P is completely torn off from the main girder.
The frame 33 to which the cut pieces P are connected is raised to a predetermined height via the lifting hoist 26 of 0.

In this embodiment, the length of the cut piece P in the direction perpendicular to the bridge axis is cut to be longer than the bridge axis direction, so that the swivel trolley 25 of the lifting mechanism 20 is attached to the swivel rail 24 as shown in FIG.
The deck removal device 30 and the cut piece P are rotated 90 degrees and converted into a position for loading onto the bed of the transport vehicle C.

The cut piece P in this position and the deck removal device 30 are moved in the bridge axial direction by running the lateral trolley 21 of the lifting mechanism 20 along the lateral rail 11, and placed directly below the loading hoist 112 installed at one end of the lateral rail 11.

After removing the load anchor member 34 and releasing the connection between the cut piece P and the frame 33, the horizontal trolley 21 of the lifting mechanism 20 is moved on the horizontal rail 11 to move only the deck removal device 30 to the middle of the telescopic frame mechanism 10, and a new cut piece P is lifted using the deck removal device 30.
Removal work will begin.

On the other hand, the cut pieces P are lifted up by the loading hoist 112 as shown in FIG.
The cut pieces P are then hoisted to a predetermined height via the heavy object moving device 100, and a transport vehicle C is driven in so that the loading platform is positioned below the lifted cut pieces P, and the cut pieces P are loaded onto the loading platform. In this way, the cut pieces P that have been removed and moved via the heavy object moving device 100 can be transported out of the road bridge B.

<When placing the temporarily placed new deck piece N at the site where the cut piece P was removed>
After all the cut pieces P have been removed by repeating the above procedure, new deck pieces N are laid on the main girder D at the sites where the cut pieces P were removed.

The new deck piece N is transported to the construction site by the transport vehicle C, and is temporarily placed on the existing deck below the loading hoist 112 from the loading platform of the transport vehicle C using the loading hoist 112.
In addition, the deck removal device 30 is removed from the lifting hoist 26 of the lifting mechanism 20, and the lateral trolley 21 is caused to travel along the lateral rail 11 to below the loading hoist 112.

9(a), the temporarily placed new deck piece N is suspended using the lifting hoist 26 of the lifting mechanism 20, and the lateral trolley 21 is moved along the lateral rail 11 to the work area provided in the inner space of the telescopic frame mechanism 10. Since the orientation of the new deck piece N when placed at the site where the cut piece P was removed and moved is such that its length in the direction perpendicular to the bridge axis is longer than its length in the bridge axis direction, the swivel trolley 25 of the lifting mechanism 20 is made to travel along the swivel rail 24, and the orientation of the new deck piece N is rotated 90 degrees to change it to the orientation when it is installed on the top surface of the main girder D.

After that, as necessary, as shown in FIG. 5, the transverse trolley 21 is further moved along the transverse rail 11 to move the lifting mechanism 20 in the bridge axis direction.
The lifting mechanism 20 is moved in the direction perpendicular to the bridge axis by running the lifting mechanism 20 along the perpendicular rail 22.
The position of the new deck P is determined at the planned installation position on the main girder D.

Once the new deck P has been aligned in this manner, the new deck piece N is suspended using the lifting hoist 26 of the lifting mechanism 20 and placed on the upper surface of the main girder D, as shown in Figure 9 (b).

In addition, it is preferable to previously provide the new deck piece N with a removably attachable attachment that can be attached to the lifting hoist 26 of the lifting mechanism 20.
The placement work of the cutting P is performed by cutting the cutting P located in the work area provided in the inner space of the telescopic frame mechanism 10.
After all of the cut pieces P are removed, the new deck pieces N may be installed one after another, or the work of removing the cut pieces P and the work of placing the new deck pieces N may be carried out alternately.

After the above work is completed, the heavy object moving device 100 is transported from the construction site. The heavy object moving device 100 is not dismantled, but the pillars 13 and connecting beams 14 of the portal frame 12 are shortened to the smallest possible size to be loaded onto a trailer T, and the reduced size heavy object moving device 100 is then loaded onto the trailer T and transported from the construction site.

As described above, in the bridge deck replacement method, when the heavy load moving device 100 is used to remove and move the cut pieces P of the existing deck from the main girder D, a series of operations from removal of the cut pieces P to transportation can be performed, and the work efficiency can be significantly improved.
Since the lifting mechanism 20 can always support the deck slab removal device 30, a temporary storage area is not required, making it possible to ensure a large working area.

In addition, the heavy object moving device 100 does not need to be assembled or disassembled every time it is transported to or from the construction site, which greatly improves workability. Furthermore, since it can be transported in and out using a single trailer T, transportation costs can be reduced compared to when multiple trailers T are required, which contributes to shortening the construction period and reducing the construction costs.

In addition, the portal frame 12 has a structure having two support columns, and the telescopic frame mechanism 10 consisting of a pair of portal frames 12 has a structure having a total of four support columns 13, so that it can be installed in a small installation space.
When installing the unit, the telescopic frame mechanism 10 can be deployed by extending the pillars 13 and connecting beams 14 of the portal frame 12 to the desired length, thereby ensuring the desired width for the internal space that serves as the work area.

The weight moving device of the present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit and scope of the present invention.

For example, in this embodiment, in order to pull off the cut piece P from the main girder D, the heavy load moving device 1
A deck removal device 30 is installed on the lifting mechanism 20 of 00, and the deck removal device 30 is used to remove the cut piece P
However, if the cut piece P is in a state where it can be removed simply by lifting it up, the cut piece P may be removed by utilizing the lifting hoist 26 of the lifting mechanism 20 without using the deck removal device 30.

Furthermore, the heavy objects to be removed by the heavy object moving device are not limited to cut pieces, and the heavy object moving device can be applied to any heavy object.

Furthermore, the numbers of the lateral rails 11, the orthogonal rails 22, the lateral trolleys 21, the orthogonal trolleys 23, the swivel trolleys 25, etc. are not limited to those mentioned above.

100 Heavy object moving device 10 Telescopic frame mechanism 11 Horizontal rail 111 Chain block 112 Loading hoist 12 Gate-shaped frame 121 Brace material 13 Support 131 Cylinder 132 Piston rod 14 Connecting beam 15 Connecting truss 16 Truss structure 17 Side panel 20 Lifting mechanism 21 Horizontal trolley 22 Orthogonal rail 23 Orthogonal trolley 24 Swivel rail 25 Swivel trolley 251 Connecting material 26 Lifting hoist 30 Deck slab removal device 31 Vertical member 32 Horizontal member 33 Frame 34 Anchor member for lifting load 341 Anchor rod 342 Anchor plate 343 Head nut 344 Tip nut 35 Reaction jack 351 Piston rod 352 Cylinder T Trailer C Transport vehicle P Cut piece H Parapet B Road bridge D Main girder N Newly installed deck piece

Claims (1)

a delivery process in which a deck slab moving device, which is equipped with a first portal frame having first and second pillars which are extendable and have adjustable spacing, a second portal frame having third and fourth pillars which are extendable and have adjustable spacing, and a lifting mechanism, but which is not equipped with a deck slab removal device which removes the existing deck slab from the main girder of a road bridge, is loaded onto a trailer and delivered to a construction site, in which a part of the deck slab moving device is loaded onto the trailer in a state in which the spacing between the first to fourth pillars falls within a width which can be loaded onto the trailer, and the heights of the first to fourth pillars are adjusted to a height which allows road traffic when loaded onto the trailer;
An installation process for installing the deck moving device at a predetermined position, the installation process including extending the first to fourth columns in a height direction and widening a distance between the first column and the second column and a distance between the third column and the fourth column;
a removal step of removing the trailer;
A step of installing a deck removal device on the deck moving device after the removal step;
A process of cutting an existing deck of a road bridge to a size that can be loaded onto a loading platform of a transport vehicle to form a cut piece, wherein a length of the cut piece in a direction perpendicular to the bridge axis is longer than a length of the cut piece in a direction along the bridge axis;
A step of peeling off the cut piece from the main girder by the deck removal device;
A step of lifting the cut piece and rotating the cut piece by 90 degrees by the lifting mechanism;
A step of driving a transport vehicle so that a loading platform is positioned below the lifted cut piece of the existing deck slab;
and loading the cut pieces onto the bed of the transport vehicle.

Images