JP7660445B2 - Self-propelled crane - Google Patents

Description

The present invention relates to a self-propelled crane suitable for use in railway construction.

For example, when laying a double-track railway line in which the first and second tracks run parallel to each other on the concrete deck of an viaduct, precast slab panels are lined up in two rows along the extension direction of the railway track to be laid, and a first permanent rail that constitutes the first track and a second permanent rail that constitutes the second track are laid at specified lengths on top of the precast slab panels that make up each row.
In such railway construction work, mobile cranes have conventionally been used that run on rails and are capable of raising and lowering materials and equipment and transporting the materials and equipment along the longitudinal direction of the rails.
Therefore, conventionally, when laying a single permanent rail, a first temporary rail for running on a trolley is first laid at the position on the concrete deck where the permanent rail will be laid, and then a second temporary rail for running on a mobile crane is laid outside of this first temporary rail.
A cart loaded with precast slab slabs and rails is run along the first temporary rail to transport the precast slab slabs and rails, and a mobile crane is run along the second temporary rail to arrange the precast slab slabs on the cart onto the concrete floor slab.
In this case, before the precast slabs are arranged on the concrete floor slab, the first temporary rail is removed, and after the precast slabs are arranged on the concrete floor slab, the removed first temporary rail is laid on the arranged precast slabs as the first permanent rail.
After the first permanent rail is laid, the second permanent rail is laid in the same manner as the first permanent rail, and thus two permanent rails are laid.

JP 2010-37727 A

As a result, conventional mobile cranes could only transport materials and equipment along the longitudinal direction of the rails, so the work of lifting and lowering the precast slab slab and installing it on the concrete deck and the work of laying the permanent rails had to be carried out in the narrow space inside the mobile crane positioned on the second temporary rail. This made it impossible to increase the efficiency of the work of lifting and lowering the precast slab slab and installing it on the concrete deck and the work of laying the permanent rails, which was disadvantageous in terms of increasing the efficiency of railway construction work.
In particular, railway construction projects can extend over tens or hundreds of kilometers, and in foreign countries even thousands of kilometers, so some kind of improvement in railway construction was desired.
The present invention has been made in consideration of the above circumstances, and its object is to provide a self-propelled crane that is advantageous in improving the efficiency of railway construction work, shortening the construction period of railway construction work, and reducing costs.

In order to achieve the above-mentioned object, one embodiment of the present invention is a self-propelled crane that can run along a rail on both sides of the rail for vehicle travel, and is characterized in that it comprises a plurality of running sections arranged on both sides of the rail, a platform supported by the plurality of running sections, and a crane provided on the platform that enables the transfer of materials and equipment in the vertical direction and any horizontal direction, and the platform is configured to allow a cart loaded with materials and equipment running on the rail to pass between the plurality of running sections.
In addition, one embodiment of the present invention is characterized in that the self-propelled crane further includes a switching unit that switches between a first running state in which the multiple running parts run on both sides of the rail, and a second running state in which the platform is placed on the cart and the multiple running parts move upwardly away from both sides of the rail and run together with the cart.
Moreover, one embodiment of the present invention is characterized in that the switching unit includes a lifting unit that is provided on the platform and raises and lowers the multiple running parts between a lowered position and an raised position, and a rocking plate that is provided on the platform and rocks between a retracted position where it retracts from an upper portion of the rail and a loading position where it protrudes above the rail and can be placed on the cart, and the first running state is formed when the multiple running parts are lowered to the lowered position by the lifting unit and the rocking plate is rocked to the retracted position, and the second running state is formed when the rocking plate is rocked to the protruding position and placed on the cart, and the multiple running parts are raised to the raised position by the lifting unit.
In addition, one embodiment of the present invention is characterized in that the stand has lower side portions located on both sides of the rail and extending parallel to the rail, and the oscillating plates are provided in multiple portions on the lower side portions located on both sides of the rail, each spaced apart in the longitudinal direction of the rail.
In addition, one embodiment of the present invention is characterized in that, in the retracted position, the multiple oscillating plates each provided on the lower side portion of the frame extend linearly parallel to the longitudinal direction of the rail, and when viewed from the direction of travel of the bogie, the multiple oscillating plates each provided on the lower side portion of the frame are positioned within the contour of the frame.
In addition, one embodiment of the present invention is characterized in that each of the running parts includes a drive roller, a guide roller, a crawler frame supporting the drive rollers and the guide rollers, and a crawler suspended between the rollers, and the lifting part includes a hydraulic cylinder supported by the base and raising and lowering the crawler frame.
In addition, one embodiment of the present invention is characterized in that the crane includes a beam that is horizontally rotatable on the upper part of the frame, a rotation mechanism for rotating the beam, and a traverse-type lifting machine that travels along the beam.

According to one embodiment of the present invention, the precast slab plate can be transported and lifted at a location of the concrete floor plate where the second permanent rail is to be laid, away from the location where the first permanent rail is to be laid, or at a location of the concrete floor plate where the first permanent rail is to be laid, away from the location where the second permanent rail is to be laid.
Furthermore, the precast slab installation work and the permanent rail laying work can be carried out on the concrete floor slab in a large space that is free of any parts, materials, or carts.
This will increase the efficiency of the installation of the precast slab panels and the laying of the first and second permanent rails, thereby helping to shorten the construction period for railway construction and reducing costs.
Railway construction projects can span tens or hundreds of kilometers, and in other countries can even span thousands of kilometers, so this embodiment is extremely advantageous in shortening the construction period of railway construction projects and reducing costs.
In addition, the self-propelled crane is further equipped with a switching unit that switches between a first running state in which the multiple running units run on both sides of the rail, and a second running state in which the platform is placed on a cart and the multiple running units move upward from both sides of the rail and run together with the cart. Therefore, for example, when laying permanent rails on the concrete deck of an viaduct, the self-propelled crane can be placed in the first running state to arrange precast slab panels, and when going to a temporary storage area away from the rail installation site to replenish precast slab panels, the self-propelled crane can be switched to the second running state and placed on the cart to move quickly over the rail, which increases the efficiency of railway rail installation work, shortens the construction period for railway construction, and is advantageous for reducing costs.
In addition, since the switching unit that switches the self-propelled crane between the first running state and the second running state is composed of a lifting unit and a plurality of oscillating plates, the structure of the switching unit can be simplified and this is advantageous in stabilizing the loading state of the self-propelled crane placed on the cart at the loading position.
In addition, since multiple sway plates are provided on the lower side on both sides, this is advantageous in stabilizing the loading state of the self-propelled crane on the cart when in the loading position, and since the length of the sway plate can be shortened, this is advantageous in positioning the multiple sway plates of the self-propelled crane within the contour of the base when in the retracted position when viewed from the perspective of the traveling cart.
In addition, when viewed from the perspective of the travelling cart, the multiple oscillating plates of the self-propelled crane are located within the outline of the frame in the retracted position and the oscillating plates do not protrude to the inside or outside of the frame, which is advantageous for the cart loaded with materials and equipment to pass smoothly inside the frame.Furthermore, when the oscillating plates are placed on the cart and the self-propelled crane travels together with the cart, this is advantageous for safe and smooth travel at railway construction sites where many workers are working.
In addition, each running section can be simply constructed using a crawler running system, and the crane can be simply constructed to include a beam that is arranged to be able to rotate horizontally, and a horizontal-type lifting machine that runs along the beam.

(A) is an explanatory diagram of the concrete deck cut by a plane perpendicular to the extension direction of the viaduct, and (B) is an explanatory diagram of the state in which the temporary rail is laid on the second concrete mounting base. This is an explanatory diagram of a cart loaded with a precast slab running on a temporary rail. FIG. 11 is an explanatory diagram showing the self-propelled crane of this embodiment lifting a precast slab panel from a cart and transporting it onto a first concrete mounting base. 1 is an explanatory diagram showing how mortar is filled between the first concrete mounting base and the precast slab panel by a mortar filling device mounted on a cart running on a virtual rail. FIG. 1A is an explanatory diagram showing the state in which the first permanent rail has been laid on the first precast slab slab row, and FIG. 1B is an explanatory diagram showing the state in which the temporary rail has been removed from the second concrete mounting base. This is an explanatory diagram showing how a cart is run on the first permanent rail to transport a precast slab plate, and then the precast slab plate is lifted from the cart by the self-propelled crane of this embodiment and transferred onto the second concrete mounting base. 13 is an explanatory diagram showing how mortar is filled between the second concrete mounting base and the precast slab panel using a mortar filling device mounted on a carriage running on the first permanent rail. This is an explanatory diagram of the state in which the removed temporary rail is laid on the second precast slab slab row as the second permanent rail. 1 is a perspective view of a state in which a precast slab plate is transported by a dolly and transferred onto a first concrete mounting base by a self-propelled crane of this embodiment. FIG. This is an explanatory diagram of the state in which the rocking plate, which has been swung to the loading position, is placed on the cart, the running part is raised to the raised position, and the self-propelled crane of this embodiment can move together with the cart as the cart moves. FIG. 2 is a perspective view of a traveling section and a lifting section of the self-propelled crane of the present embodiment.

First, an embodiment of the present invention will be described with reference to the drawings.
In this embodiment, a self-propelled crane is used to install a double-track railway track in which a first track and a second track extend parallel to each other on a concrete deck 14 of an elevated bridge, as shown in Figure 8, i.e., two permanent rails, a first permanent rail 10 constituting the first track and a second permanent rail 12 constituting the second track.
As shown in FIG. 1(A), two concrete mounting bases, a first concrete mounting base 16 and a second concrete mounting base 18, are provided on the concrete deck 14 of the viaduct, spaced apart in the width direction of the concrete deck 14 and extending in the longitudinal direction of the concrete deck 14.
A balustrade (not shown) is erected on both sides of the width of the concrete deck 14, and each of the first concrete mounting base 16 and the second concrete mounting base 18 is provided with a plurality of positioning protrusions (not shown).

1(B), a temporary rail 12A is laid on the second concrete mounting base 18 on which the second permanent rail 12 is to be laid. As will be described later, this temporary rail 12A is removed and used as the second permanent rail 12.
As shown in FIG. 2, the temporary rail 12A allows a carriage 20 to run on it.
The trolley 20 is used to load the precast slab 42 and the permanent rails onto its loading platform 2002, and multiple traction vehicles are connected together, with a towing vehicle (not shown) connected to the front of the traction vehicles.

As shown in FIG. 9, the self-propelled crane 22 includes a plurality of traveling units 24, a base 26 supported by the plurality of traveling units 24, a crane 28 provided on the base 26, a control unit (not shown), and a remote controller (not shown).
As shown in Figure 9, two running sections 24 are provided on each side of the temporary rail 12A, and in this embodiment, as shown in Figure 3, two running sections 24 are provided on each side of the second concrete mounting base 18, for a total of four running sections 24.
11, each traveling unit 24 is configured to include a drive roller 2402, a guide roller 2404, a crawler 2406 stretched across the rollers 2402, 2404, and a crawler frame 2408 supporting the rollers 2402, 2404. The crawler 2406 is rotated forward and backward by rotating the drive roller 2402 forward and backward by a crawler motor (not shown), and the crawler motor is rotated forward and backward via a control unit by an operator operating a remote controller. Note that it is optional to use tires instead of the crawler 2406.

As shown in FIG. 10, the stand 26 includes a pair of lower side portions 30, four legs 32, a top plate 34, four lifting portions 36, and a plurality of swing plates 38.
As shown in Figure 3, the pair of lower side portions 30 extend above the two running portions 24 on both sides of the second concrete mounting base 18 along the extension direction of the second concrete mounting base 18, i.e., parallel to the temporary rail 12A.
As shown in FIG. 10, a running portion 24 is disposed on the lower surface of each of the pair of lower side portions 30 at both ends in the extending direction.
As shown in Figure 11, the lifting section 36 raises and lowers the running section 24, and is composed of hydraulic cylinders 3602 provided at both ends of the pair of lower side sections 30 in the extension direction, and each hydraulic cylinder 3602 is connected to a crawler frame 2408 of the running section 24.
The hydraulic cylinder supports the crawler 2406 so that it can be raised and lowered between a lowered position where the crawler 2406 touches the concrete floor slab 14 and an elevated position where it is raised from the lowered position. Hydraulic pressure is supplied to and discharged from the hydraulic cylinder 3602 via a hydraulic motor and hydraulic circuit (not shown), and the crawler 2406 is extended and contracted via the control unit by the worker operating a remote controller.

The four legs 32 extend upward from both ends of the lower side portion 30 in the extending direction and support a top plate 34 .
As shown in FIG. 10, in this embodiment, two oscillating plates 38 are provided between two legs 32 provided at both ends of the lower side portion 30, for a total of four oscillating plates 38, but one oscillating plate 38 may be provided on each lower side portion 30, or three or more oscillating plates 38 may be provided.
Each oscillating plate 38 provided on the lower side portion 30 is supported by the lower side portion 30 so as to be oscillable around a support shaft 40 provided on the lower side portion 30 near the leg portion 32, and is immovable in the vertical direction by the lower side portion 30 and the head 40002 of the support shaft 40.
Each oscillating plate 38 oscillates between a retracted position in which it is retracted from an upper portion of the trolley 20 which runs on the lower side portion 30 and extends in a straight line between the two legs 32, as shown in Figure 9, and a loading position in which it protrudes from the lower side portion 30 in the width direction of the second concrete mounting base 18 and can be placed on the loading platform 2002 of the trolley 20, as shown in Figure 10.
When viewed from the traveling position of the carriage 20 , the two rocking plates 38 provided on the lower side portion 30 are located within the contours of the legs 32 , i.e., within the contours of the base 26 , in the retracted position.

When the two oscillating plates 38 provided between each of the four legs 32 are placed in the loading position and the running part 24 is raised to the raised position, the four oscillating plates 38 are placed on the loading platform 2002 of the cart 20, the self-propelled crane 22 is loaded onto the cart 20, and the self-propelled crane 22 can travel together with the cart 20.
Therefore, by lowering the running parts 24 of the self-propelled crane 22 and swinging each swing plate 38 to the retracted position, the self-propelled crane 22 enters a first running state in which the multiple running parts 24 run on both sides of the temporary rail 12A.
In addition, by swinging each oscillating plate 38 to the loading position and bringing the running parts 24 into the raised position, a second running state is reached in which the platform 26 is placed on the cart 20 and the multiple running parts 24 move upward from both sides of the temporary rail 12A and run together with the cart 20.
In this embodiment, a switching unit 39 (see Figure 10) that switches the self-propelled crane 22 between a first traveling state and a second traveling state is configured to include a lifting unit 36 and a plurality of swing plates 38.

The dimension between the two legs 32 provided on either side of the second concrete mounting base 18, the dimension between the two oscillating plates 38 located in a retracted position on either side of the second concrete mounting base 18, and the height of the underside of the top plate 34 are formed to allow the trolley 20 loaded with the precast slab plate 42 and the towing vehicle to pass through.
In other words, the platform 26 is configured so that the cart 20 carrying the precast slab panels 42 , which are materials and equipment, can pass between the multiple running sections 24 .
In this embodiment, the rocking plate 38 is manually rocked by an operator, but it may be arbitrarily rocked between the retracted position and the placement position electrically.

As shown in FIG. 3, the crane 28 is composed of a beam 44 extending horizontally and supported so as to be capable of horizontal rotation, a transverse lifting machine 46 running along the beam 44, and a rotation mechanism 48 for rotating the beam 44.
Therefore, the crane 28 is configured to be able to transport materials and equipment in the vertical direction and in any horizontal direction.
The beam 44 is supported on the top plate 34 via a support column 4401 and a support shaft 4402 so as to be horizontally rotatable.
The horizontal-type lifting machine 46 is provided so as to be capable of traveling in the longitudinal direction of the beam 44 , and a balancer 4404 is provided at the longitudinal end of the beam 44 closer to the support shaft 4402 .
The beam 44 is formed to a length that enables a horizontal-type lifting machine 46 to travel outside the parapet (not shown) on the side on which the self-propelled crane 22 is positioned when the self-propelled crane 22 is placed on the second concrete mounting base 18, that is, when the platform 26 is supported by a plurality of running sections 24 arranged on both sides of the temporary rails 12A, so that materials and equipment such as electric wires can be transported from the ground onto the concrete deck 14 of the viaduct.
In this embodiment, as described below, even when the platform 26 is supported by a plurality of running sections 24 arranged on both sides of the first permanent rail 10, the platform 26 is formed to a length that allows a horizontal lifting machine 46 to run outside the parapet (not shown) on the side where the self-propelled crane 22 is located, so that materials and equipment such as electric wires can be transported from the ground onto the concrete deck 14 of the viaduct.

The rotation mechanism 48 is composed of a motor 4802 with a reduction mechanism supported by a bracket 4406 attached to the beam 44, and a gear mechanism 4806 that is rotated by the motor 4802 and meshes with an outer gear 4804 attached to the support shaft 4402.
In addition, the motor that raises and lowers the hook 4602 of the horizontal-type lifting machine 46, the horizontal motor of the horizontal-type lifting machine 46, and the motor with a reduction mechanism 4802 that constitutes the slewing mechanism 48 are driven via the control unit by the worker operating the remote controller.

In this embodiment, as shown in FIG. 3, the cart 20 is run on the temporary rail 12A to transport the precast slab 42 and the first permanent rail 10 to the location of the temporary rail 12A near the location where the first permanent rail 10 is to be laid, and once the self-propelled crane 28 has been moved, an operator operates the remote controller to lift the precast slab 42 from the cart 20 using the horizontal lifting machine 46, run the horizontal lifting machine 46, rotate the beam 44 to hoist the precast slab 42 onto the first concrete mounting base 16, insert the positioning convex portion (not shown) into the positioning concave portion (not shown) of the precast slab slab 42, fasten the precast slab slab 42 to the first concrete mounting base 16 with bolts (not shown), and line up the precast slab slabs 42 in a straight line on the first concrete mounting base 16 to form a first precast slab slab row 42A.
Then, rail mounting brackets 50 are attached to predetermined locations on the precast slab slabs 42 constituting the first precast slab slab row 42A.

Such operations are repeated while moving the self-propelled crane 22 and running the traveling carriage 20.
Once the precast slab slabs 42 have been lined up on the first concrete mounting base 16 to form a first precast slab slab row 42A of a specified length, as shown in Figure 4, a cart 20 equipped with a mortar filling device 52 is run on the temporary rails 12A to fill mortar 5202 into the gap created between the underside of the precast slab slabs 42 and the upper surface of the first concrete mounting base 16, and the precast slab slab 42 is placed on the second concrete mounting base 18.
Once the precast slab panels 42 have been installed on the first concrete mounting base 16 in this manner, the first permanent rail 10 is laid on the first precast slab panel row 42A via the rail mounting brackets 50, as shown in Figure 5 (A).
In this manner, the installation of the precast slab 42 and the laying of the first permanent rail 10 are repeatedly carried out.

Once the first permanent rail 10 has been laid a predetermined length on the first concrete mounting base 16, for example, approximately 200 m of the first permanent rail 10, the next step is to lay the second permanent rail 12 on the second concrete mounting base 18.
5(B), first, the temporary rail 12A having a length equivalent to the length of the second permanent rail 12 to be laid on the second concrete mounting base 18, for example a length of about 200 m, is removed from the second concrete mounting base 18. The removed temporary rail 12A is used as the second permanent rail 12.
Also, as shown in Figure 6, the self-propelled crane 22 is moved from the second concrete mounting platform 18 to the first concrete mounting platform 16 by its running parts 24, and both running parts 24 are positioned on both sides of the width of the first concrete mounting platform 16.
Then, the cart 20 carrying the precast slab 42 is made to run on the first permanent rail 10 for transportation.

By operating the remote controller, a worker uses the horizontal lifting machine 46 to lift the precast slab plate 42 from the cart 20, moves the horizontal lifting machine 46, rotates the beam 44 to hoist the precast slab plate 42 onto the second concrete mounting base 18, inserts the positioning protrusion (not shown) into the positioning recess (not shown) of the precast slab plate 42, places the precast slab plate 42 on the second concrete mounting base 18 and arranges it in a straight line, thereby forming the second precast slab plate row 42B.
Then, rail mounting brackets 50 are attached to predetermined locations on the precast slab slabs 42 that constitute the second precast slab slab row 42B.
Such operations are repeated while moving the self-propelled crane 22 and running the traveling carriage 20.

Once the precast slab slabs 42 have been lined up on the second concrete mounting base 18 to form the second precast slab slab row 42B, as shown in Figure 7, a cart 20 equipped with a mortar filling device 52 is run on the first permanent rail 10 to fill mortar 5202 into the gap created between the underside of the precast slab slab 42 and the upper surface of the second concrete mounting base 18, and the precast slab slab 42 is placed on the second concrete mounting base 18.
Once the precast slab panels 42 have been installed on the second concrete mounting base 18 in this manner, the removed temporary rail 12A is laid as the second permanent rail 12 on the second precast slab panel row 42B via the rail mounting brackets 50, as shown in Figure 8.
In this manner, the installation of the precast slab 42 and the laying of the second permanent rail 12 are repeated.

Once the second permanent rail 12 has been laid to a predetermined length on the second concrete mounting base 18, the first permanent rail 10 is laid again on the first concrete mounting base 16.
In this case, as described above, the trolley 20 is run on the temporary rail 12A on the second concrete mounting base 18 to transport the precast slab slab 42 and the first permanent rail 10 to the location where the first permanent rail 10 is to be laid, and the self-propelled crane 22 is moved onto the second concrete mounting base 18, and the installation of the precast slab slab 42 and the laying of the first permanent rail 10 are repeated. Once the first permanent rail 10 has been laid to a predetermined length on the first concrete mounting base 16, the work of laying the second permanent rail 12 is then carried out on the second concrete mounting base 18 in the same manner as described above, and the laying of the first permanent rail 10 and the laying of the second permanent rail 12 are carried out alternately.

When the self-propelled crane 22 of this embodiment is used in this manner, the crane 28 is configured to be able to transport materials and equipment vertically and horizontally, so that when laying the first permanent rail 10, a temporary rail 12A is laid at a location on the concrete deck 14 away from the first permanent rail 10, and a cart 20 carrying a precast slab plate 42 is run on this temporary rail 12A to transport it, and a mobile crane 28 is positioned at the location where the temporary rail 12A is laid, and the precast slab plate 42 can be transported and lifted at a location away from the location where the first permanent rail 10 is laid.
The precast slab 42 can be installed and the first permanent rail 10 can be laid on the concrete floor slab 14, which is a large space free of any parts, members, carts, etc.
In addition, when laying the second permanent rail 12, a trolley 20 loaded with a precast slab plate 42 is run on the first permanent rail 10 separated from the second permanent rail 12 to transport it, and a mobile crane 28 is positioned at the location where the first permanent rail 10 is laid, so that the precast slab plate 42 can be transported and hoisted at a location separated from the location where the second permanent rail 12 is laid.
The precast slab 42 can be installed and the second permanent rail 12 can be laid on the concrete floor 14, which is a large space free of any parts, members, or carts.

Therefore, compared to the conventional method in which the work of installing the precast slab plate on the concrete deck and laying the permanent rails were carried out within the narrow space inside a mobile crane, this method improves the efficiency of the work of installing the precast slab plate 42 and laying the permanent rails, shortens the construction period for railway construction, and is advantageous in reducing costs.
Railway construction projects can span tens or hundreds of kilometers, and in other countries can even span thousands of kilometers, so this embodiment is extremely advantageous in shortening the construction period of railway construction projects and reducing costs.

In addition, by using the self-propelled crane 22 of this embodiment, when laying the first permanent rail 10, it is only necessary to perform the work twice: laying the first permanent rail 10 and laying the temporary rail 12A.Compared to the conventional method, which requires a total of five rail installation and removal operations, including attaching and removing the rail for the trolley to run on the concrete floor slab 14, attaching the removed rail for the trolley to run on the precast slab slab 14 as a permanent rail, and then attaching and removing the rail for the trolley with a lifting device to the concrete floor slab 14, the labor required for installing and removing the rail 12A can be significantly reduced, which is advantageous in improving the efficiency of railway rail laying work, shortening the construction period for railway construction, and reducing costs.
Similarly, when laying the second permanent rail 12, it is only necessary to remove the temporary rail 12A and then lay the removed temporary rail 12A as the second permanent rail twice, which significantly reduces the labor required for installing and removing the rails compared to the conventional method, which requires installing and removing the rails five times, thereby improving the efficiency of railway track installation work, shortening the construction period for railway construction, and being advantageous in reducing costs.
Therefore, when the first permanent rail 10 and the second permanent rail 12 are laid using the method of this embodiment, the rails only need to be attached and removed a total of four times, which significantly reduces the labor required for laying and removing the rails compared to the conventional method, which requires installing and removing the rails ten times, thereby improving the efficiency of railway track laying work, shortening the construction period for railway construction, and is advantageous in reducing costs.

In addition, the platform 26 of the self-propelled crane 22 is configured so that the cart 20 carrying the precast slab 42 can pass between the multiple running sections 24.
Therefore, when placing the precast slab 42 on the first and second concrete mounting bases 16, 18 or laying the first and second permanent rails 10, 12 on the precast slab 42, the trolley 20 can be run past the frame 26 to move the precast slab 42 to the desired location, which improves the efficiency of the installation work of the precast slab 42 and the laying work of the first and second permanent rails 10, 12, shortens the construction period for railway construction, and is advantageous for reducing costs.
In addition, when the two oscillating plates 38 provided between each of the four legs 32 are placed in the loading position and the running part 24 is raised to the raised position, the four oscillating plates 38 are placed on the cart 20 and the self-propelled crane 22 can run together with the cart 20.This means that the self-propelled crane 22 can be quickly moved, for example, when going to a temporary storage area away from the permanent rail laying site to replenish precast slab panels 42, which is advantageous in improving the efficiency of railway rail laying work, shortening the construction period for railway construction work, and reducing costs.

In addition, in this embodiment, a switching unit 39 (see Figure 10) is provided that switches between a first running state in which the multiple running units 24 run on both sides of the temporary rail 12A, and a second running state in which the platform 26 is placed on the cart 20, the multiple running units 24 move upward from both sides of the temporary rail 12A, and the self-propelled crane 22 runs together with the cart 20.
Therefore, the self-propelled crane 22 can be in the first traveling state to arrange the precast slab panels 42, and when going to a temporary storage area away from the rail installation site to replenish precast slab panels 42, the self-propelled crane 22 can be switched to the second traveling state and quickly moved over the rails by placing it on the cart 20, which is advantageous in improving the efficiency of railway rail installation work, shortening the construction period for railway construction, and reducing costs.

In addition, in this embodiment, a switching unit 39 (see Figure 10) that switches the self-propelled crane 22 between a first traveling state and a second traveling state is configured to include a lifting unit 36 and a plurality of swing plates 38.
This switching unit 39 has multiple hydraulic cylinders on the underside of the top plate 34, with their axes oriented vertically, and is arranged so that the multiple hydraulic cylinders can move back and forth horizontally between a loading position located above the trolley 20 and a retracted position retracted from above the trolley 20, and at the loading position, the hydraulic cylinders are extended to raise the platform 26 on the trolley 20, and the running part 24 is moved above the concrete floor slab 14 to place the platform 26 on the trolley 20, and at the retracted position, the hydraulic cylinders are retracted to move above the trolley 20 to ground the running part 24 on the concrete floor slab 14.
However, if configured as in the embodiment, the structure of the switching unit 39 can be simplified, and it is also advantageous in stabilizing the loading state of the self-propelled crane 22 placed on the carriage 20 in the loading position.

In addition, one sway plate 38 may be provided on each lower side portion 30, but providing two on each lower side portion 30 at intervals along the length of the virtual rail 12A, as in this embodiment, is advantageous in stabilizing the loading state of the self-propelled crane 22 on the cart 20 in the loading position, and since the length of the sway plate 38 can be shortened, when viewed from the traveling of the cart 20, the four sway plates 38 of the self-propelled crane 22 are positioned within the contour of the legs 32 in the retracted position, i.e., within the contour of the stand 26.
In addition, when viewed from the perspective of the travel of the trolley 20, the four oscillating plates 38 of the self-propelled crane 22 are located within the contours of the legs 32 in the retracted position, i.e., within the contours of the base 26, and the oscillating plates 38 do not protrude inside or outside the base 26, which is advantageous for the trolley 20 loaded with materials and equipment to pass smoothly between the multiple legs 32.Furthermore, when the oscillating plates 38 are placed on the trolley 20 and the self-propelled crane 22 travels together with the trolley 20, this is advantageous for safe and smooth travel over the narrow concrete deck 14 sandwiched between parapets on both sides where many workers are working.

In addition, the beam 44 is formed with a length that allows a horizontal lifting machine 46 to travel outside the parapet on the side where the self-propelled crane 22 is located when the platform 26 is supported by multiple running parts 24 arranged on both sides of the temporary rail 12A. This allows materials and equipment such as electric wires to be transported from the ground to the concrete deck 14 of the viaduct, which is advantageous in shortening the construction period of railway construction and reducing costs.

In this embodiment, the self-propelled crane 22 has been described as being used to lay two railway rails on the concrete deck 14 of an elevated bridge, but the use of the self-propelled crane 22 is not limited to elevated bridge railway construction, and it can be used for above-ground and underground railway construction as well. Furthermore, railway construction is not limited to rail laying work, and it can be used for a variety of railway construction projects.

10 First permanent rail 12 Second permanent rail 12A Temporary rail 14 Concrete floor slab 16 First concrete mounting base 18 Second concrete mounting base 20 Cart 2002 Loading platform 22 Self-propelled crane 24 Running section 2402 Drive roller 2404 Guide roller 2406 Crawler 2408 Crawler frame 26 Frame 28 Crane 30 Lower side section 32 Leg section 34 Top plate 36 Lifting section 3602 Hydraulic cylinder 38 Swing plate 39 Switching section 40 Support shaft 4002 Head section 42 Precast slab slab 42A First precast slab slab column 42B Second precast slab slab column 44 Beam 4401 Support shaft 4402 Support shaft 4404 Balancer 4406 Bracket 46 Transverse lifting machine 4602 Hook 48 Swing mechanism 4802 Motor with reduction gear 4804, outer gear 4806, gear mechanism 50, rail mounting bracket 52, mortar filling device 5202, mortar

Claims (5)

A self-propelled crane capable of traveling along a rail on both sides of the rail across which a vehicle travels,
A plurality of running parts arranged on both sides of the rail;
A stand supported by the plurality of running parts;
a crane provided on the platform and capable of transporting materials and equipment in a vertical direction and any horizontal direction;
The platform is configured so that a cart loaded with materials and equipment traveling on the rail can pass between the multiple traveling sections ,
The self-propelled crane further includes a switching unit that switches between a first traveling state in which the plurality of traveling units travel on both sides of the rail and a second traveling state in which the platform is placed on the carriage and the plurality of traveling units move upwardly away from both sides of the rail and travel together with the carriage,
the switching unit includes a lifting unit that is provided on the platform and lifts the plurality of running units between a lowered position and an elevated position, and a swing plate that is provided on the platform and swings between a retracted position at which the running units are retracted from an upper portion of the rail and a placement position at which the running units protrude above the rail and can be placed on the cart;
the first traveling state is formed in a state in which the plurality of traveling units are lowered to the lowered position by the lift unit and the rocking plate is rocked to the retreated position;
the rocking plate is swung to the placement position and placed on the carriage, and the second running state is formed in a state in which the plurality of running units are raised to a raised position by the lifting unit.
A self-propelled crane characterized by: The platform includes lower side portions located on both sides of the rail and extending parallel to the rail,
The rocking plate is provided in a plurality of positions at intervals in the longitudinal direction of the rail on the lower side portions located on both sides of the rail.
2. The self-propelled crane according to claim 1 . the plurality of rocking plates provided on the respective lower side portions of the frame extend linearly in parallel with the longitudinal direction of the rail in the retracted position, and when viewed from the traveling direction of the carriage, the plurality of rocking plates provided on the respective lower side portions of the frame are positioned within the outline of the frame;
3. The self-propelled crane according to claim 2 . Each of the traveling units includes a drive roller, a guide roller, a crawler frame supporting the drive roller and the guide roller, and a crawler stretched across the rollers;
The lifting unit is configured to include a hydraulic cylinder supported by the frame and lifting the crawler frame.
2. The self-propelled crane according to claim 1 . The crane includes a beam that is horizontally rotatable on the upper part of the frame, a rotation mechanism that rotates the beam, and a traverse-type lifting machine that travels along the beam.
2. The self-propelled crane according to claim 1 .

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