Wave-dissipating block holding device

Abstract

To provide a small and lightweight wave-dissipating block holding device which can be used easily and safely to grip and move a wave-dissipating block without requiring dangerous manual slinging work with a wire.SOLUTION: A wave-dissipating block holding device 110 comprises a bracket 112 supported by a work machine 100 and equipped with a restricting member 114 that restricts movement of one of four legs LP, the leg LP facing most upward, in at least three mutually perpendicular radial directions of that leg LP, and a curved support member 118 supported by the bracket 112, extending below the bracket 112, and capable of supporting the entire weight of a wave-dissipating block CB without plastic deformation. When the wave-dissipating block CB is held by the wave-dissipating block holding device 110, the curved support member 118 is positioned directly below the center of gravity of the wave-dissipating block CB and has a tip 118C that faces upward.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a wave-dissipating block holding device. [Background technology]

[0002] Conventionally, concrete wave-dissipating blocks have four legs that extend from the center of gravity of a regular tetrahedron in the direction of each vertex, that is, in different directions, and due to their unique shape, they can obtain a strong bonding force when multiple blocks are stacked.As a result, wave-dissipating blocks can effectively attenuate and dissipate the energy of waves generated in rivers and oceans, and are therefore also called wave-dissipating base-solidifying blocks or wave-breaking blocks, and are used for the purposes of revetments and water conservation.

[0003] However, due to the unique shape of these wave-dissipating blocks, lifting and lowering them with cranes and other work machines generally requires the use of multiple wires. Furthermore, the connection and disconnection of the multiple wires around the bottom of these blocks (wire slinging work (mounting work)) is mostly performed manually. Because these blocks are heavy, the wires used are also heavy, and simply connecting and disconnecting the wires manually requires a great deal of effort. Furthermore, the construction sites where these blocks are used often have poor footing, posing numerous risks to workers. In particular, when stacking multiple wave-dissipating blocks, workers must give instructions from the blocks adjacent to the lower ones. However, the surfaces of the wave-dissipating blocks are slippery, creating an unstable working environment. This makes workers prone to slipping and falling, resulting in numerous accidents.

[0004] For this reason, various holding devices have been proposed in the past. For example, in the holding device of Patent Document 1, in order to solve the problem of dangerous manual slinging of wires, three holding members are large and long members that sandwich the joints of the legs that extend in three directions in a plan view and reach directly below the wave-dissipating block. In other words, in Patent Document 1, the wave-dissipating block is covered from top to bottom with three holding members, and the three holding members support the vicinity of the center of gravity, making it possible to stably grasp and move the wave-dissipating block. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2019-85179 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the holding device shown in Patent Document 1 is made larger than the wave-dissipating block in order to restrict the movement of one leg in the up, down, left, and right directions (for example, for a wave-dissipating block that weighs about 16 tons and is about 3 m high, the holding device weighs about 12 tons and is about 6 m high). As a result, the holding device in Patent Document 1 itself is not only large compared to the wave-dissipating block, but is also very heavy, which could make it difficult to use easily.

[0007] Therefore, the present invention has been made to solve the above problems, and its objective is to provide a wave-dissipating block holding device that can safely grasp and move wave-dissipating blocks without requiring dangerous manual slinging work with wires, is easy to use, and is small and lightweight. [Means for solving the problem]

[0008] The present invention provides a wave-dissipating block holding device that is supported by a work machine and is capable of holding a wave-dissipating block having a plurality of legs extending in different directions, and comprises: a bracket that is supported by the work machine and has a restricting member that restricts movement of one of the legs that is facing most upward in at least three mutually perpendicular radial directions of the one leg; and a curved support member that is supported by the bracket and extends below the bracket from any of the three directions and is capable of supporting the entire weight of the wave-dissipating block without plastic deformation, and the curved support member is positioned directly below the center of gravity of the wave-dissipating block when the wave-dissipating block is held by the wave-dissipating block holding device, and has a tip that faces upward, thereby solving the above problem.

[0009] This invention comprises a bracket equipped with a restricting member that restricts the movement of one leg in at least three mutually perpendicular radial directions, and a curved support member that can support the entire weight of the wave-dissipating block without plastic deformation. In other words, this invention is configured so that the restricting member restricts the movement of one leg and the curved support member supports the entire weight of the wave-dissipating block, and therefore does not use a driving part, making it possible to achieve an extremely simple and lightweight configuration.

[0010] At the same time, the curved support member is positioned directly below the center of gravity of the wave-dissipating block when the wave-dissipating block is held by the wave-dissipating block holding device, and has a tip that faces upward. In other words, when the wave-dissipating block is held by the curved support member, the inclination of the tip always causes the wave-dissipating block to tilt in the direction of the restricting member, so the wave-dissipating block can be held stably. [Effects of the Invention]

[0011] According to the present invention, it is possible to provide a small and lightweight wave-dissipating block holding device that can be used easily and safely to grasp and move wave-dissipating blocks without having to perform dangerous manual slinging work with wires. [Brief explanation of the drawings]

[0012] [Figure 1]FIG. 1 is a schematic diagram showing a work machine, a wave-dissipating block holding device, and wave-dissipating blocks according to a first embodiment of the present invention. [Figure 2] 1 (perspective view (A), side view (B), front view (C), top view (D)) [Figure 3] A flowchart illustrating the procedure for gripping and moving a wave-dissipating block using the wave-dissipating block holding device of FIG. [Figure 4] Diagrams showing the procedure of Figure 3 ((A) lowering the wave-dissipating block holding device relative to the wave-dissipating block, (B) changing the attitude of the wave-dissipating block holding device, (C) engaging the regulating member with the wave-dissipating block, (D) positioning the tip of the curved support member directly below the wave-dissipating block, (E) tilting the wave-dissipating block holding device, (F) suspending the wave-dissipating block from the wave-dissipating block holding device) [Figure 5] A flowchart illustrating the procedure for placing wave-dissipating blocks in predetermined positions using the wave-dissipating block holding device of FIG. [Figure 6] Diagram showing the procedure in Figure 5 ((A) lowering the wave-dissipating block holding device while holding the wave-dissipating block; (B) partially touching the ground with the wave-dissipating block holding device; (C) returning the wave-dissipating block holding device to its original tilted state; (D) tilting the wave-dissipating block holding device, releasing the wave-dissipating block and placing it stably on the ground; (E) raising the wave-dissipating block holding device). [Figure 7] FIG. 10 is a schematic diagram showing a work machine and a wave-dissipating block holding device according to a second embodiment of the present invention. [Figure 8] 8A and 8B are diagrams showing the wave-dissipating block holding device of FIG. 7 (a perspective view of the state in which the wave-dissipating block is held, a side view of the state in which the wave-dissipating block is held, and a top view of the state in which the wave-dissipating block is held). [Figure 9] A flowchart illustrating the procedure for gripping and moving a wave-dissipating block using the wave-dissipating block holding device of FIG. 8. [Figure 10]Figures showing the procedure of Figure 9 (Figure (A) showing the wave-dissipating block holding device being lowered relative to the wave-dissipating block, Figure (B) showing the wave-dissipating block holding device changing its position, Figure (C) showing the state in which the regulating member is engaged with the wave-dissipating block, Figure (D) showing the tip of the curved support member being positioned directly below the wave-dissipating block, Figure (E) showing the wave-dissipating block holding device being tilted and the wave-dissipating block being tilted, Figure (F) showing the wave-dissipating block being suspended by the wave-dissipating block holding device) [Figure 11] A flowchart illustrating the procedure for placing wave-dissipating blocks in predetermined positions using the wave-dissipating block holding device of FIG. 8. [Figure 12] Diagrams showing the procedure in Figure 11 ((A) lowering the wave-dissipating block holding device while holding the wave-dissipating block; (B) partially touching the ground with the wave-dissipating block holding device; (C) returning the wave-dissipating block holding device to its original tilted state; (D) tilting the wave-dissipating block holding device, releasing the wave-dissipating block and placing it stably on the ground; (E) raising the wave-dissipating block holding device). DETAILED DESCRIPTION OF THE INVENTION

[0013] An example of the first embodiment of the present invention will be described in detail below with reference to FIGS.

[0014] First, based on FIG. 1, a working machine 100, a wave-dissipating block holding device 110, and a wave-dissipating block CB will be generally described.

[0015] As shown in FIG. 1 , the work machine 100 is, for example, a crane vehicle with outriggers (it may be an excavator or a crane mechanism mounted on a barge), and is equipped with a rotatable main body 101 and an arm body 102 whose inclination angle can be changed. The arm body 102 is, for example, an extendable telescopic boom (it may be a lattice boom). A main wheel 104 is provided at the tip of the arm body 102, and is engaged with a main wire Mw that suspends the wave-dissipating block holding device 110 (the wave-dissipating block holding device 110 is therefore in a state where it can rotate accordingly around the main wire Mw). Also, although not shown, a secondary wheel is provided at the tip of the arm body 102, and is engaged with a secondary wire Sw for changing the attitude of the wave-dissipating block holding device 110. In other words, if the feed length of the main wire Mw and the auxiliary wire Sw is shortened, the wave-dissipating block holding device 110 rises, and if the feed length of the main wire Mw and the auxiliary wire Sw is lengthened, the wave-dissipating block holding device 110 descends.

[0016] As shown in Figure 1, wave-dissipating blocks (CBs) are irregularly shaped concrete blocks with four leg sections (LP) extending from the center of gravity of a regular tetrahedron toward each vertex, i.e., extending in different directions. Wave-dissipating blocks (CBs) generally do not use reinforcing bars, partly to prevent deterioration due to corrosion. For this reason, wave-dissipating blocks (CBs) are susceptible to significant damage when subjected to localized stress. Given their size, they must be handled, transported, and installed carefully and accurately without applying excessive stress. Commonly used wave-dissipating blocks (CBs) come in 18 sizes, ranging in weight from 0.5 tons (90 cm high) to 80 tons (5 m high), with the cross section of the leg sections (LP) being approximately circular. Wave-dissipating blocks (CBs) are generally manufactured near the construction site using formwork in the required number and size.

[0017] As shown in Fig. 1, the wave-dissipating block holding device 110 is supported by the work machine 100 and is capable of holding wave-dissipating blocks CB. As shown in Fig. 2(D), the wave-dissipating block holding device 110 has a shape that is symmetrical with respect to the plane of symmetry PL, and as shown in Figs. 2(A) to 2(D), it comprises a bracket 112 and a curved support member 118. The bracket 112 is rotatably supported on the work machine 100 by an attachment structure 116 and comprises a restricting member 114. The curved support member 118 is supported by the bracket 112, extends below the bracket 112 from the +X direction, and is a member that is capable of supporting the entire weight of the wave-dissipating blocks CB without plastic deformation.

[0018] In this embodiment, the wave-dissipating blocks CB are assumed to be those used primarily in ports and harbors, but they may also be those weighing less than 20 tons and used in rivers. For example, for a wave-dissipating block CB weighing 16 tons and approximately 3 m in height, the wave-dissipating block holding device 110 can be configured to weigh less than 5 tons and be less than 3 m in height at most. It is desirable to use different wave-dissipating block holding devices 110 for each size of wave-dissipating block CB, but one size of wave-dissipating block holding device 110 can hold two or more adjacent wave-dissipating block CBs of different sizes (for example, a wave-dissipating block holding device 110 designed for a 37-ton (3.9 m high) wave-dissipating block CB can move a 46-ton (4.2 m high) wave-dissipating block CB).

[0019] Next, each component will be described in detail.

[0020] As shown in FIGS. 2(A) to 2(D), the bracket 112 includes a restricting member 114 and an attachment structure 116.

[0021] The restricting member 114 is a symmetrical U-shaped member (it does not necessarily have to be symmetrical or U-shaped) and restricts movement of one of the four innermost legs LP, the one facing most upward, in three mutually orthogonal radial directions of that one leg LP. In this embodiment, the three directions are the +X direction and ±Y directions shown in FIG. 2(A). The restricting member 114 is supported on the work machine 100 via a mounting structure 116.

[0022] As shown in FIG. 2(A), the mounting structure 116 includes connecting portions 116A, 116C, and 116D and a wire rope 116B. As shown in FIG. 2(B), the connecting portion 116A is a member rotatably connected to each of the upper end portions 114AA of the two end portions 114A of the regulating member 114, and is connected to the lower end of each wire rope 116B. The upper end of each wire rope 116B is integral with the connecting portion 116C. As shown in FIG. 2(B), the connecting portion 116C includes a stopper portion 116CA that integrates the upper end of each wire rope 116B and a hook portion 116CB that rotatably supports the stopper portion 116CA. The hook portion 116CB is configured to be connected to the main wire Mw. The connecting portion 116D is attached to the back surface of a curved support member 118, which is fixed to the back surface of the regulating member 114. The connecting portion 116D has a configuration similar to that of the connecting portion 116C, and includes a stopper portion 116DA attached to the back surface of the curved support member 118 and a hook portion 116DB that rotatably supports the stopper portion 116DA, and the hook portion 116DB is connected to the secondary wire Sw. Because the mounting structure 116 has this configuration, it is possible to smoothly reflect the expansion and contraction states of the main wire Mw and the secondary wire Sw in the posture of the wave-dissipating block holding device 110.

[0023] As shown in Figure 2(B), the curved support member 118 is a member that extends from the back surface of the regulating member 114 in the +X direction below the bracket 112. The curved support member 118 includes a connecting portion 118A that is connected to the bracket 112, a curved portion 118B that extends below the connecting portion 118A and has an inwardly curved arc shape, and a flat tip portion 118C that is integrally connected to the curved portion 118B. The end of the tip portion 118C is split into two. This makes it easy to position the tip portion 118C directly below the wave-dissipating block CB.

[0024] As shown in FIG. 2(B), an engaging member 120 is attached to the lower end 114AB of the tip 114A of the regulating member 114. As a result, the engaging member 120 is disposed on the outer periphery of the leg LP, which is disposed inside the regulating member 114. The engaging member 120 includes a connecting portion 120A and a wire rope 120B. The wire rope 120B has a diameter of 1 cm or more and is configured to maintain a deformed arc-shaped state. The engaging member 120 is also considered a part of the regulating member 114. In other words, the regulating member 114 further includes a deformable engaging member 120 that maintains its inner diameter equal to or greater than the minimum outer diameter of the leg LP. Therefore, the regulating member 114 is capable of restricting all radial movement of one leg LP.

[0025] The central axis O shown in FIG. 2(B) indicates the central axis of the wave-dissipating block CB when the wave-dissipating block CB is held. In this embodiment, the position of the connection part 120A is near the central axis O, making it easier for the wire rope 120B attached to the connection part 120A to maintain its arc shape. Furthermore, the position of the connection part 116A is located away from the central axis O on the opposite side of the central axis O from the connection part 116D. Therefore, when the wave-dissipating block holding device 110 is supported by the main wire Mw, the angle θ between the vertical direction and the central axis O is approximately 10 to 20 degrees, and the tip part 118C faces upward. In other words, when the wave-dissipating block CB is held by the wave-dissipating block holding device 110, the tip part 118C of the curved support member 118 is configured to be positioned directly below the center of gravity of the wave-dissipating block CB and to face upward. Therefore, by changing (shortening) the feed length of the secondary wire Sw relative to the main wire Mw, the angle θ from the vertical to the central axis O can be reduced, or increased in the opposite direction, thereby changing the posture of the wave-dissipating block holding device 110 (in other words, the bracket 112 is provided with a change member (i.e., mounting structure 116) that changes the positional relationship between the regulating member 114 and the curved support member 118 when the bracket 112 is rotatably supported by the work machine 100). Note that the engaging member 120 is detachable from the regulating member 114, can be easily replaced when it is severely worn, and can be made to an optimum length for the size of the wave-dissipating block CB.

[0026] Next, the procedure for gripping and moving the wave-dissipating block CB using the wave-dissipating block holding device 110 in this embodiment will be described with reference to FIG. 3 and FIGS. 4(A) to 4(F).

[0027] First, the main wire Mw and the sub-wire Sw are extended from the work machine 100, and the wave-dissipating block holding device 110 is lowered from above the wave-dissipating block CB (step S2 in FIG. 3, FIG. 4(A)).

[0028] Next, the position of the arm body 102 is adjusted to adjust the position of the wave-dissipating block holding device 110. Then, the length of the auxiliary wire Sw relative to the main wire Mw is adjusted to rotate the wave-dissipating block holding device 110 so that one of the legs LP facing upward is located inside the regulating member 114 (step S4 in Figure 3, Figure 4(B)).

[0029] Next, the lengths of the main wire Mw and the auxiliary wire Sw are adjusted while they are both extended, and the wave-dissipating block holding device 110 is further lowered while one of the legs LP is kept positioned between the engaging member 120 and the regulating member 114 (Fig. 4(C)). Then, the auxiliary wire Sw is extended longer relative to the main wire Mw, and the wave-dissipating block holding device 110 is rotated, so that the tip 118C is positioned directly below the wave-dissipating block CB with no tension on the auxiliary wire Sw (Fig. 3 step S6, Fig. 4(D)).

[0030] Next, with almost no tension in the secondary wire Sw, the main wire Mw is pulled up slightly to tilt the wave-dissipating block holding device 110, i.e., the tip portion 118C, and the tip portion 118C is turned upward to tilt the wave-dissipating block CB, so that the wave-dissipating block CB is completely supported by the tip portion 118C (step S8 in Figure 3, Figure 4(E)).

[0031] Then, the work machine 100 pulls up the main wire Mw with almost no tension in the secondary wire Sw, raising the wave-dissipating block holding device 110 and moving the wave-dissipating block CB (step S10 in Figure 3, Figure 4(F)). Note that the posture of the wave-dissipating block holding device 110 with the wave-dissipating block CB suspended in the air is substantially the same as the state in Figure 4(E).

[0032] Next, the procedure for placing the wave-dissipating blocks CB at predetermined positions using the wave-dissipating block holding device 110 in this embodiment will be described with reference to FIG. 5 and FIGS. 6(A) to 6(E).

[0033] First, the work machine 100 supports the wave-dissipating block holding device 110 with the main wire Mw while leaving the auxiliary wire Sw in a state where there is almost no tension, and places the wave-dissipating block holding device 110 holding the wave-dissipating blocks CB in the air above a predetermined position. Then, the main wire Mw and auxiliary wire Sw are extended to lower the wave-dissipating block holding device 110 (step S20 in Figure 5, Figure 6(A)).

[0034] Next, when part of the wave-dissipating block CB has been grounded in the designated position (Figure 6(B)), the speed at which the main wire Mw and the secondary wire Sw are extended is slowed down to completely position the wave-dissipating block CB in the designated position (Figure 5 step S22, Figure 6(C)).

[0035] Next, the auxiliary wire Sw is pulled up to tilt the wave-dissipating block holding device 110, and the tip portion 118C directly below the wave-dissipating block CB is removed (step S24 in FIG. 5, FIG. 6(D)).

[0036] Then, the main wires Mw and the sub-wires Sw are pulled up to raise the wave-dissipating block holding devices 110, thereby separating the wave-dissipating block holding devices 110 from the wave-dissipating blocks CB (step S26 in FIG. 5, FIG. 6(E)).

[0037] As described above, in this embodiment, the restricting member 114 is provided with a deformable engaging member 120 that maintains its inner diameter equal to or greater than the minimum outer diameter of the leg portion LP. The restricting member 114 restricts all radial movement of one leg portion LP. In other words, the bracket 112 is provided with the restricting member 114 that restricts radial movement of one leg portion LP in four mutually perpendicular directions, and the bracket 112 is provided with a curved support member 118 that can support the entire weight of the wave-dissipating block CB without plastic deformation. Therefore, in this embodiment, the restricting member 114 restricts the movement of one leg portion LP, and the curved support member 118 supports the entire weight of the wave-dissipating block CB, so no driving part is used, and an extremely simple and lightweight configuration can be achieved.

[0038] For example, according to conventional technology, for a wave-dissipating block weighing approximately 16 tons and measuring approximately 3 m in height, a wave-dissipating block holding device would weigh approximately 12 tons and measure approximately 6 m in height. However, the wave-dissipating block holding device 110 of this embodiment can be constructed to weigh less than 5 tons and measure less than 3 m in height at most, and furthermore, since it does not have a drive unit, it is less prone to breakdowns and is easy to maintain.

[0039] At the same time, the curved support member 118 has a tip 118C that is positioned directly below the center of gravity of the wave-dissipating block CB and faces upward when the wave-dissipating block CB is held by the wave-dissipating block holding device 110. In other words, when the wave-dissipating block CB is held by the curved support member 118, the inclination of the tip 118C always causes the wave-dissipating block CB to tilt in the direction where the regulating member 114 is located, so it is possible to hold the wave-dissipating block CB stably.

[0040] In this embodiment, the regulating member 114 includes the engaging member 120, but the engaging member 120 is not necessarily required. Even in this case, the regulating member regulates movement in at least three mutually orthogonal directions (±Y direction and +X direction) in the radial direction of one leg portion LP, and the tilt of the tip always tilts the wave-dissipating block CB in the direction where the regulating member is located, so it is possible to stably hold the wave-dissipating block CB.

[0041] Furthermore, in this embodiment, the bracket 112 is provided with a change member (mounting structure 116) that changes the positional relationship between the regulating member 114 and the curved support member 118 when the bracket 112 is rotatably supported by the work machine 100. Therefore, the posture of the wave-dissipating block holding device 110 can be changed by changing the feed length of the secondary wires Sw relative to the main wires Mw. This makes it possible to change the posture of the wave-dissipating block holding device 110 according to the posture of the wave-dissipating block CB, and to grip and lift the wave-dissipating block CB. However, this is not limited to this, and another work machine may be used to move the wave-dissipating block CB so that the two legs LP are easy to grip, and then the wave-dissipating block CB may be gripped and transported. Furthermore, when transporting the wave-dissipating block CB and placing it in a predetermined position, it may be temporarily placed near the predetermined position and then moved to the desired posture by another work machine, etc.

[0042] Therefore, in this embodiment, it is possible to provide a small, lightweight wave-dissipating block holding device 110 that can be used safely and easily to grasp and move the wave-dissipating blocks CB without requiring dangerous manual slinging work with wires. In other words, the wave-dissipating block holding device 110 can be manufactured at a lower cost than conventional technology, and can be easily transported, installed, and used, and it is also possible to quickly and reliably move the wave-dissipating blocks CB during emergency measures when there is a risk of a levee breach, for example.

[0043] Although the present invention has been described using the first embodiment, the present invention is not limited to the first embodiment. In other words, it goes without saying that improvements and design changes are possible within the scope of the present invention.

[0044] For example, in the first embodiment, the wave-dissipating block holding device 110 was connected to the arm body 102 via the main wire Mw and the sub-wire Sw, but the present invention is not limited to this. For example, it may be as shown in the second embodiment shown in Figures 7 to 12. In the second embodiment, the wave-dissipating block holding device 210 is configured to be directly connected to the tip of the arm body 202 so that its posture can be controlled. The second embodiment will be described below. The main difference from the first embodiment is the work machine 200 and its connecting part.

[0045] In this embodiment, the work machine 200 is a backhoe with a bendable arm body 202, as shown in Figure 7. In other words, the work machine 200 is configured to include a main body 201 that is movable on an endless track, and an arm body 202 that is swingably supported by the main body 201. A wave-dissipating block holding device 210 is attached to and supported by a support shaft and a link shaft provided at the tip of the arm body 202, in the same way as a normal work attachment (for example, a cutter or grapple).

[0046] 8(A), (B), and (C), the wave-dissipating block holding device 210 comprises a bracket 212 having a restricting member 214 and a mounting structure 216, and a curved support member 218. The mounting structure 216 comprises a pair of mounting plates 216A and a connecting portion 216B. The pair of mounting plates 216A are spaced apart so as to sandwich the tip of the arm member 202, and are integrated by a connecting portion 216B that is a cylindrical member. Each of the pair of mounting plates 216A is provided with a main mounting hole 216AA that is rotatably supported by a link shaft at the tip of the arm member 202, and a sub-mounting hole 216AB that is rotatably supported by the main shaft at the tip of the arm member 202. In other words, the pair of mounting plates 216A are directly connected to sandwich the tip of arm body 202, and are configured to be perpendicular to the rotation axis when arm body 202 swings and rotates. Restriction member 214 includes connection parts 214A attached to the ends of the pair of mounting plates 216A, respectively, and wire ropes 214B having both ends connected to connection parts 214A. In other words, the ends of restriction member 214 are configured to be connected to each of the pair of mounting plates 216A.

[0047] As shown in Figure 8(B), the curved support member 218 is a member that extends from the connecting portion 216B in the +X direction below the bracket 212. The curved support member 218 includes a connecting portion 218A that is connected to the connecting portion 216B of the bracket 212, a curved portion 218B that extends below the connecting portion 218A and has an inwardly curved arc shape, and a flat tip portion 218C that is integrally connected to the curved portion 218B. The end of the tip portion 218C is split into two. This makes it easy to position the tip portion 218C directly below the wave-dissipating block CB.

[0048] Next, the procedure for gripping and moving the wave-dissipating block CB using the wave-dissipating block holding device 210 in this embodiment will be described with reference to FIG. 9 and FIGS. 10(A) to 10(F).

[0049] First, the arm body 202 of the work machine 200 is controlled to lower the wave-dissipating block holding device 210 from above the wave-dissipating blocks CB (step S32 in FIG. 9, FIG. 10(A)).

[0050] Next, the position of the arm body 202 and the attitude of the wave-dissipating block holding device 210 are adjusted as necessary to bring the wave-dissipating block holding device 210 even closer to the wave-dissipating block CB (FIG. 10(B)). Then, the regulating member 214 is engaged with one of the legs LP facing upward (FIG. 9 step S34, FIG. 10(C)). Note that this engaged state refers to a state in which one of the legs LP is positioned inside the regulating member 214.

[0051] Next, while maintaining this engaged state, the wave-dissipating block holding device 210 is lowered. Then, the work machine 200 is operated to rotate and adjust the wave-dissipating block holding device 210, and the tip portion 218C is inserted directly below the center of gravity of the wave-dissipating block CB (step S36 in Figure 9, Figure 10(D)).

[0052] Next, the work machine 200 is operated to tilt the tip 218C while moving it slightly forward, thereby tilting the wave-dissipating block CB so that the tip 218C fully supports the wave-dissipating block CB (step S38 in Figure 9, Figure 10(E)).

[0053] Then, the arm body 202 of the work machine 200 raises the wave-dissipating block holding device 210 and moves the wave-dissipating block CB (step S40 in Fig. 9, Fig. 10(F)). Note that the attitude of the wave-dissipating block holding device 210 can be controlled by the work machine 200, so it is possible to keep the attitude of the wave-dissipating block holding device 210 almost unchanged even when the wave-dissipating block CB is suspended in the air.

[0054] Next, the procedure for placing the wave-dissipating blocks CB in predetermined positions using the wave-dissipating block holding device 210 in this embodiment will be described with reference to FIG. 11 and FIGS. 12(A) to 12(E).

[0055] First, the arm body 202 of the work machine 200 is controlled to lower the wave-dissipating block holding device 210 holding the wave-dissipating block CB from the sky (step S42 in FIG. 11, FIG. 12(A)).

[0056] Next, when a portion of the wave-dissipating block CB has landed in the designated position (Figure 12(B)), the work machine 200 is operated to control the rotation of the wave-dissipating block holding device 210, so that the wave-dissipating block CB is completely positioned in the designated position (Figure 11 step S44, Figure 12(C)).

[0057] Next, the work machine 200 is operated to further rotate and control the wave-dissipating block holding device 210, tilting the wave-dissipating block holding device 210 and removing the tip 218C directly below the wave-dissipating block CB (step S46 in Figure 11, Figure 12(D)).

[0058] Then, the arm body 202 of the work machine 200 raises the wave-dissipating block holding device 210 to separate the wave-dissipating block CB (step S48 in FIG. 11, FIG. 12(E)).

[0059] As described above, in this embodiment, the bracket 212 is directly connected to the tip of the arm body 202 of the work machine 200 so as to sandwich the bracket 212 therebetween. The bracket 212 is equipped with a pair of mounting plates 216A that are perpendicular to the axis of rotation when the bracket 212 is swung and rotated by the arm body 202. At the same time, the ends of the regulating member 214 are connected to each of the pair of mounting plates 216A. Therefore, the regulating member 214 can regulate movement in four mutually perpendicular radial directions of one leg portion LP, while also allowing the work machine 200 to easily position the tip portion 218C directly below the center of gravity of the wave-dissipating block CB and subsequently orient the tip portion 218C upward. Specifically, because the work machine 200 is a backhoe, it is possible to easily and quickly control the attitude of the wave-dissipating block CB when placing the wave-dissipating block CB, and to perform a series of operations.

[0060] At the same time, in this embodiment, the positions of the ends of the regulating members 214 are spaced apart, so that the surfaces of the leg portions LP can be deeply gripped by the regulating members 214 so that they fit between the mounting plates 216A, as shown in Figure 8(A). Therefore, even if the wave-dissipating block holding device 210 is small and lightweight, it is possible for the wave-dissipating block holding device 210 to stably hold even wave-dissipating blocks CB with relatively large leg portions LP.

[0061] However, this is not limiting, and the bracket does not have to have a pair of mounting plates. Alternatively, even if the bracket has a pair of mounting plates, the restricting member may not use a wire rope, but may instead be configured such that a pair of holding members capable of gripping the leg portions LP on the inside of each other are supported by the pair of mounting plates in an openable and closable manner. Furthermore, the end of the engaging member may be connected to a part other than the pair of mounting plates.

[0062] In the above embodiment, the wave-dissipating block CB has four legs LP, but the present invention is not limited to this, and the wave-dissipating block CB may have two or more legs LP (in the case of two legs LP, this also applies to cases where the orientations of the legs LP are different even in the case of a single wave-dissipating block CB). [Industrial Applicability]

[0063] The present invention is suitable for moving, transporting and installing wave-dissipating blocks having multiple legs extending in different directions and used in rivers and harbors. [Explanation of symbols]

[0064] 100, 200...Work machinery 101, 201...Main body 102, 202...Arm body 104...Main wheel 110, 210... Wave-dissipating block holding device 112, 212... bracket 114, 214...Regulatory components 114A…Tip 114AA…Top end 114AB…Tip lower end 116, 216...Mounting structure 116A, 116C, 116D, 118A, 120A, 214A, 218A...Connections 116B, 120B, 214B...Wire rope 116CA, 116DA...Stopping part 116CB, 116DB...Hook part 118, 218...curved support members 118B, 218B...curved section 118C, 218C...Tip 120...Engagement member 216A...Mounting plate 216AA…Main mounting hole 216AB...Secondary mounting hole 216B…Connection part CB: Wave-dissipating blocks GD…Ground LP…legs Mw: Main wire O…Central axis PL: Symmetry plane Sw...Secondary wire θ…Angle

Claims

1. A wave-dissipating block holding device that is supported by a work machine and can hold a wave-dissipating block having a plurality of legs extending in different directions, a bracket supported by the work machine and including a restricting member that restricts movement of one of the plurality of legs that faces most upward in at least three mutually orthogonal radial directions of the one leg; a curved support member supported by the bracket, extending below the bracket from any of the three directions, and capable of supporting the entire weight of the wave-dissipating block without plastic deformation; Equipped with The wave-dissipating block holding device is characterized in that the curved support member is positioned directly below the center of gravity of the wave-dissipating block when the wave-dissipating block is held by the wave-dissipating block holding device and has a tip portion facing upward.

2. In claim 1, The regulating member further comprises a deformable engaging member that maintains its inner diameter equal to or greater than the minimum outer diameter of the leg, thereby restricting all radial movement of the one leg. A wave-dissipating block holding device.

3. In claim 1, A wave-dissipating block holding device characterized in that the bracket is provided with a change member that changes the positional relationship between the regulating member and the curved support member when the bracket is rotatably supported on the work machine.

4. In claim 1 or 2, The work machine includes a main body movable on an endless track and an arm body swingably supported on the main body, the bracket includes a pair of mounting plates that are directly connected to the tip end of the arm body so as to sandwich the tip end of the arm body and are perpendicular to a rotation axis when the arm body swings and rotates, A wave-dissipating block holding device characterized in that the ends of the regulating member are connected to each of the pair of mounting plates.

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