Deck transport and erection equipment

Abstract

To provide a floor slab transportation and erection device capable of replacing a floor slab of an elevated road being narrow and having slopes.SOLUTION: A floor slab transportation and erection device comprise a first frame that is placed on a fork of a forklift, a second frame that is provided on the first frame rotatably in a left-right direction in a road lane axial direction, a third frame provided on the second frame movably in a longitudinal direction in the road lane axial direction, and a plurality of connecting members that are suspended from the third frame and connected to the floor slab.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a deck slab transport and erection device. [Background technology]

[0002] Due to fatigue and aging caused by the increasing size of vehicles, deck slabs of elevated roads, especially bridges that have been in operation for more than 40 years, require renewal, such as deck replacement. The precast decks used in deck replacement work are generally loaded onto large vehicles and transported to the construction site, where they are installed using large cranes or the like. For example, Patent Document 1 describes a replacement method that enables the replacement of large deck slabs. According to this deck replacement method, a deck replacement device is transported to the construction site by trailer, and the large deck is replaced using the replacement device. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-98489 Summary of the Invention [Problem to be solved by the invention]

[0004] Some elevated roads that require deck replacement have narrow widths that large vehicles and large cranes cannot enter, and there are cases where the technology described in Patent Document 1 cannot be applied. Also, when the technology described in Patent Document 1 is applied to an elevated road with a slope, it may be difficult to adjust the slope when installing the deck.

[0005] The present invention aims to provide a deck slab transportation and erection device having various adjustment mechanisms that can replace deck slabs on narrow and sloped elevated roads. [Means for solving the problem]

[0006] In order to achieve the above object, one aspect of the present invention is a deck slab transportation and erection device comprising: a first frame placed on forks of a forklift; a second frame mounted on the first frame so as to be rotatable in the left-right direction in the road lane axial direction; a third frame mounted on the second frame so as to be movable in the front-rear direction in the road lane axial direction; and a plurality of connecting members suspended from the third frame and connected to the deck slab. [Effects of the Invention]

[0007] According to the present invention, it is possible to replace the deck of an elevated road that is narrow and has a slope. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a side view showing the configuration of an elevated road to be constructed according to an embodiment of the present invention. [Figure 2] FIG. [Figure 3] FIG. 10 is a diagram showing the state of the deck slab transportation and erection device placed on a forklift. [Figure 4] FIG. 2 is a front view showing the configuration of the deck slab transportation and erection device. [Figure 5] 10A and 10B are diagrams illustrating a state of rotation adjustment of a second frame relative to a first frame. [Figure 6] FIG. 10 is a diagram showing the state of gradient adjustment in the longitudinal direction of the third frame relative to the second frame. [Figure 7] FIG. 10 is a diagram showing the state of gradient adjustment in the transverse direction of the third frame relative to the second frame. [Figure 8] 10A and 10B are diagrams showing the state of the forward and backward movement structure of the third frame relative to the second frame. [Figure 9] FIG. 1 is a front view showing the state of the deck slab suspended from the deck slab transportation and erection device. [Figure 10] FIG. 1 is a side view showing the state of the deck slab suspended from the deck slab transportation and erection device. [Figure 11]This is a diagram showing a method for constructing an elevated road using a deck transportation and erection device. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of a deck slab transportation and erection device according to the present invention will be described with reference to the drawings. In the following description, in the XYZ coordinate system, the direction along the X axis will be referred to as the front-to-rear direction, the road lane axis direction or longitudinal direction, the direction along the Y axis will be referred to as the left-to-right direction or transverse direction, and the direction along the Z axis will be referred to as the up-to-down direction, etc. These are representative examples of relative directions in normal use. In the following description, the road lane axis direction will be set as the reference line.

[0010] As shown in FIG. 1, the elevated road D to be constructed has a predetermined gradient (e.g., 9.5%) in the road lane axis direction (X-axis direction in the figure). The elevated road D is a narrow, single-lane road (e.g., effective width: 4450 mm) that prevents large vehicles and large cranes from entering or being installed. In addition, other elevated roads (not shown) are provided on both sides of the elevated road D. In addition, the elevated road D may have other structures above it, resulting in overhead restrictions.

[0011] As shown in FIG. 2, the deck S is made of, for example, a precast concrete structure. The deck S is, for example, an HSPJ (High Smart Prestress Joint (HS Prestress Joint: registered trademark)) deck. After the deck S is installed, side walls S1 are provided on both sides of the upper surface of the deck S in the road lane width direction. The deck S is formed of members having a width SL in the transverse direction (Y-axis direction) perpendicular to the road lane axial direction, of, for example, about 5250 mm, and a length in the road lane axial direction, of, for example, about 2100 mm. The maximum weight of the deck S is, for example, about 10 t. The above dimensions and weight of the deck S are merely examples, and the dimensions and weight may be changed as appropriate depending on the installation target.

[0012] As shown in Figures 3 to 8, the deck slab transporting and erecting device 1 is configured to be placed on forks F1 attached to a forklift F. The forklift F is, for example, a forklift with a rated load of 15 tons. The deck slab transporting and erecting device 1 is, for example, 3 tons. The forks F1 are attached so as to be movable up and down relative to the forklift body FB. The forks F1 are also attached so that the angle of inclination relative to the forklift body FB can be adjusted.

[0013] The deck slab transportation and erection device 1 includes a frame 2 mounted on the forks of a forklift, multiple connecting members 6 suspended from the frame 2 and connected to the deck S, and a member 7 securing the frame 2 to the forks F1. The frame 2 includes a first frame 3 mounted on the forks, a second frame 4 mounted on the first frame, and a third frame 5 mounted on the second frame. The first frame 3 is formed, for example, of a rectangular framework and steel plates in a plan view. Four legs 3A are provided on the underside of the first frame 3 to be placed on the ground. The legs 3A are provided with spaces 3B into which the forks F1 are inserted and secured when the forks F1 are placed on the ground. The forks F1 inserted into the spaces 3B are secured by fixing bolts 7A inserted from the underside of the front legs 3A in the fore-and-aft direction. The base ends of the forks are secured by plate-shaped fixing members 7B secured to the rear sides of the rear legs 3A in the fore-and-aft direction.

[0014] A structure is provided on the upper surface of the first frame 3 that allows the second frame 4 to rotate left and right in the lane axis direction in plan view (see FIG. 5). A rotating structure R that rotates around a rotation axis L along the vertical direction (Z-axis direction) is provided between the first frame 3 and the second frame 4. A support part 4D that is supported on the upper surface of the first frame 3 and slides during rotation may be provided on the lower surface of the second frame 4. The rotating structure R includes, for example, a first jack R1 for rotation that is offset perpendicularly from the rotation axis L. The first jack R1 for rotation is, for example, a telescopic hydraulic jack. For example, one end of the first jack R1 is connected to the first frame 3 and the other end is connected to the second frame 4. The first jack R1 rotates the second frame 4 relative to the first frame 3. The telescopic movement of the first jack R1 causes the second frame 4 to rotate around the rotation axis L relative to the first frame 3. The adjustment range of the direction (rotation) relative to the front-rear direction is, for example, ±5°.

[0015] The second frame 4 includes, for example, a lower frame 4A (first lower frame) provided on the lower side and an upper frame 4B (first upper frame) provided above the lower frame 4A. The lower frame 4A and the upper frame 4B are formed, for example, in a frame shape using members such as channel steel in a plan view. The upper frame 4B and the lower frame 4A include a first hinge structure 4C that rotates around a rotation axis L2 along the left-right direction (see FIG. 6). The first hinge structure 4C rotatably connects, for example, the rear sides of the lower frame 4A and the upper frame 4B in the front-to-rear direction. The front sides of the lower frame 4A and the upper frame 4B are supported by a pair of second jacks R2 on the left and right.

[0016] The second jack R2 has, for example, one end connected to the upper frame 4B and the other end connected to the lower frame 4A. The second jack R2 is, for example, a telescopic hydraulic jack. The second jack R2 can adjust the gradient of the upper frame 4B relative to the lower frame 4A in the longitudinal direction, which is the road lane axis direction, by extending and retracting. A third frame 5 is provided above the upper frame 4B. The third frame 5 can simultaneously adjust the longitudinal gradient by changing the gradient of the upper frame 4B relative to the road lane axis direction using the first hinge structure 4C and the second jack R2. The second jack R2 allows fine adjustment of the longitudinal gradient of the third frame relative to the second frame in the fore-and-aft direction after the gradient adjustment of the fork F1.

[0017] The third frame 5 includes, for example, a lower frame 5A (second lower frame) provided on the lower side and an upper frame 5B (second upper frame) provided above the lower frame. The lower frame 5A and the upper frame 5B are formed, for example, from channel steel to have a rectangular frame shape in a plan view. The upper frame 5B and the lower frame 5A include a second hinge structure 5C that rotates around a rotation axis L3 along the front-rear direction (see FIG. 7). The second hinge structure 5C rotatably connects, for example, one side of the lower frame 5A and the upper frame 5B in the left-right direction. The other sides of the lower frame 5A and the upper frame 5B are supported by, for example, a pair of third jacks R3 arranged along the front-rear direction. The third jack R3 allows the gradient of the upper frame 5B in the transverse direction relative to the lower frame 5A to be adjusted.

[0018] The third frame 5 is provided so as to be movable in the front-to-rear direction relative to the upper frame 4B of the second frame 4 (see FIG. 8). The third frame 5 is provided so as to be movable in the front-to-rear direction relative to the upper frame 4B of the second frame 4 via a moving structure 5D. The moving structure 5D is provided, for example, between the upper frame 4B and the lower frame 5A. The moving structure 5D is formed, for example, using rails, guide members, etc. (not shown) that move the lower frame 5A of the third frame 5 in the front-to-rear direction relative to the upper frame 4B. The upper frame 5B moves in conjunction with the lower frame 5A. The position of the moving structure 5D is adjusted, for example, by a fourth jack R4. The fourth jack R4 enables, for example, the third frame 5 to be moved relative to the upper frame 4B so as to be pulled toward the forklift F.

[0019] The upper frame 5B of the third frame 5 is formed with a width in the left-right direction that is wider than the width of the second frame 4 in the left-right direction, and both ends of the upper frame 5B in the left-right direction are provided with a pair of protrusions 5E, 5F (see Figure 4) that protrude outward from both ends of the second frame 4.

[0020] The protrusions 5E, 5F are provided with a plurality of connecting members 6 that are suspended from the underside and connected to the deck S. Two connecting members 6 are arranged in the front-to-rear direction on each of the protrusions 5E, 5F. The upper and lower ends of the connecting members 6 are provided with ball joints 6A or the like that allow them to rotate in any direction.

[0021] A ball joint 6A or the like provided at the lower end of the connecting member 6 is fixed to the upper surface of the deck S using a bolt or the like. As shown in Figures 9 and 10, the deck S is suspended from the third frame 5 by the connecting member 6 via the ball joint 6A or the like, and is therefore suspended at the slope of the third frame 5.

[0022] The deck slab transporting and erecting device 1 is firmly fixed to the fork F1 of the forklift body FB by, for example, fixing bolts 7A or fixing members 7B as shown in Figs. 3 and 4 so as not to move in the vertical and longitudinal directions.

[0023] According to the deck slab transportation and erection device 1, the gradient of the deck slab S in the longitudinal direction can be adjusted by adjusting the gradient of the forks F1 in the forklift body FB in the front-to-rear direction. Furthermore, the position of the deck slab S in the lateral direction can be adjusted by using a sliding mechanism to move the forks F1 left and right. According to the deck slab transportation and erection device 1, the first jack R1 (see FIG. 5) rotates the second frame 4 together with the third frame 5 relative to the first frame 3 around the rotation axis L, allowing for fine adjustment of the direction of the deck slab S relative to the rotational direction. According to the deck slab transportation and erection device 1, the gradient of the third frame 5 in the longitudinal direction relative to the second frame 4 can be fine-tuned using the second jack R2, allowing for fine adjustment of the gradient of the deck slab S in the longitudinal direction. The adjustment range of the gradient in the longitudinal direction is, for example, ±2%.

[0024] According to the deck slab transportation and erection device 1, the third jack R3 makes it possible to adjust the gradient of the third frame relative to the second frame in the transverse direction, thereby enabling fine adjustment of the gradient of the deck slab S in the transverse direction. The adjustment range of the gradient in the transverse direction is, for example, ±2%. According to the deck slab transportation and erection device 1, the fourth jack R4 makes it possible to adjust the position of the third frame 5 relative to the second frame 4 in the fore-and-aft direction, thereby enabling adjustment of the position to which the deck slab S is pulled in the fore-and-aft direction. The range to which the deck slab S is pulled in the fore-and-aft direction is, for example, 250 mm. This allows the deck slab S to move in conjunction with the amount of movement of the deck slab S when moved by a moving structure provided on the installation side during installation, as will be described later.

[0025] The first jack R1, the second jack R2, the third jack R3, and the fourth jack R4 are extended and retracted by hydraulic cylinders and controlled by working fluid circulated by a hydraulic unit (not shown). The hydraulic unit is driven by, for example, a single-phase 100V power supply, and individually controls the extension and retraction of the first jack R1, the second jack R2, the third jack R3, and the fourth jack R4, and can be operated by a remote hand switch (not shown).

[0026] As shown in FIG. 11, the deck slab S is transported in a suspended state by a deck slab transportation and erection device 1 placed on the forks F1 of a forklift F. The deck slab S is placed one by one on the main girders M from which the old deck slab has been removed. The main girders M have a slope. The forklift F travels on the deck slab S that has already been installed on the main girders M. When the deck slab S has reached approximately the installation target position P, the driver of the forklift F lowers the forks F1. The installation target position P is a position that is a predetermined distance away from the front of the installed deck slab S.

[0027] When the deck S is roughly close to the installation position P, the driver adjusts the approximate gradient of the forks F1 in the longitudinal direction relative to the forklift body FB, bringing the gradient of the deck S closer to the gradient of the main girder M at the installation position P. In addition, the approximate position adjustment of the deck S in the fore-and-aft direction is adjusted by moving the forklift F forward or backward. The gradient in the longitudinal direction that cannot be adjusted by adjusting the gradient of the forks F1 is fine-tuned by the second jack R2. The gradient in the transverse direction that cannot be adjusted by adjusting the forks F1 is fine-tuned by the third jack R3.

[0028] The rotational direction of the deck S is finely adjusted by the first jack R1. When the deck S is positioned near the installation target position P, the operator lowers the fork F1 and places the deck S on the installation target position P.

[0029] Since the deck S is spaced a predetermined distance in front of the existing deck S, it is pulled toward the existing deck S by a pulling jack (not shown) provided on the side of the existing deck S. At this time, the fourth jack R4 is operated in conjunction with the pulling jack to move the third frame 5 toward the forklift F. This allows the third frame 5 to be moved toward the existing deck S together with the suspended deck S.

[0030] The left-right position of the deck slab S is adjusted appropriately, for example, using the left-right adjustment function of the fork F1. The worker may also fine-tune the position of the suspended deck slab S using a crowbar or the like. The deck slab S placed at the installation target position P is fastened to the existing deck slab S using fastening members (not shown). The fastened deck slab S becomes a new floor surface on which a forklift F can travel. By repeating the above process, a floor surface made of deck slabs S can be constructed on the main girders M. Side walls S1 (see Figure 2) are provided on the deck slabs S arranged continuously on the main girders M. The top surface of the deck slabs S is then paved, and an elevated road is constructed.

[0031] As described above, the deck slab transportation and erection device 1 makes it possible to transport and erect the deck slab S to the installation target position P using a forklift F. With the deck slab transportation and erection device 1, the deck slab S is transported using a forklift F, so it is possible to replace the deck slab in construction conditions where there is a steep gradient, narrow location, or overhead restriction, such as an elevated road ramp where a large crane cannot be installed. With the deck slab transportation and erection device 1, the deck slab S can be roughly positioned to the installation target position P, transported, and erected based on the lifting and lowering function of the forks F1 of the forklift F, the gradient adjustment function in the longitudinal direction, the position adjustment function in the left-right direction, and the self-propelling function of the forklift F itself.

[0032] According to the deck slab transportation and erection device 1, the longitudinal and transverse gradients and the position in the rotational direction of the deck slab S can be finely adjusted based on the operation of the first to fourth jacks R4 provided on the device itself.

[0033] Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and can be modified as appropriate without departing from the spirit of the invention. For example, the deck slab transporting and erecting device 1 may be used not only for transporting road decks but also for transporting decks indoors. [Explanation of symbols]

[0034] 1. Deck transport and erection equipment 2 frames 3 First frame 4. Second Frame 4A Lower frame (first lower frame) 4B Upper frame (first upper frame) 5. Third Frame 5A Lower Frame (Second Lower Frame) 5B Upper frame (second upper frame) 6 Connecting members 7 Components F Forklift F1 Fork R1 First jack R2 Second jack R3 3rd jack R4 4th jack S floor slab

Claims

1. a first frame placed on forks provided on a forklift; a second frame provided on the first frame so as to be rotatable in the left-right direction in the road lane axis direction; a third frame provided on the second frame so as to be movable in a front-rear direction in the road lane axis direction; and a plurality of connecting members suspended from the third frame and connected to the deck. Deck transport and erection equipment.

2. a first jack for rotating the second frame together with the third frame relative to the first frame; The deck slab transporting and erecting device according to claim 1.

3. the second frame includes a first lower frame and a first upper frame provided on the first lower frame, a second jack for adjusting a longitudinal gradient of the first upper frame relative to the first lower frame in the road lane axis direction; The deck slab transporting and erecting device according to claim 1 or 2.

4. the third frame includes a second lower frame and a second upper frame provided on the second lower frame, a third jack that adjusts a cross slope of the second upper frame relative to the second lower frame in the road lane axial direction; The deck slab transporting and erecting device according to claim 1 or 2.

5. a fourth jack configured to move the third frame relative to the second frame in a front-rear direction in the road lane axis direction; The deck slab transporting and erecting device according to claim 1 or 2.

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