Wave-dissipating block gripping device and wave-dissipating block moving method

Abstract

Provided is a wave-breaking block grasping device 110 that is supported by a work machine 100 and that is capable of grasping a wave-breaking block CB provided with four leg parts LP, said wave-breaking block grasping device 110 comprising: an engagement structure 114 which has a pair of holding members 122 and a base member 118 that axially supports the pair of holding members 122, and in which the pair of holding members 122 are capable of holding one of the leg parts LP; and an engagement member 126 which has a ring member that has an inner diameter not less than the minimum outer diameter of the leg parts LP, which is supported by the base member 118 at a prescribed angle α, and which supports another one of the leg parts LP that is oriented upward. The pair of holding members 122 are capable of supporting the wave-breaking block CB without being plastically deformed by the weight of the wave-breaking block CB. When the pair of holding members 122 support the wave-breaking block CB, the tip end parts 122A of the pair of holding members 122 are disposed lower than the engagement member 126. Thus, it is possible to provide a wave-breaking block grasping device 110 that grasps and moves a wave-breaking block CB safely while being more compact and lightweight, and a method for moving wave-breaking blocks.

Description

Technical Field

[0001] The present invention relates to a wave-dissipating block gripping device and a method for moving a wave-dissipating block.

Background Art

[0002] Conventionally, a concrete wave-dissipating block having four legs extending from the centroid position of a regular tetrahedron in the directions of the respective vertices, that is, extending in different directions from each other, can obtain a strong bonding force when a plurality of them are stacked and arranged due to its unique shape. For this reason, the wave-dissipating block can effectively attenuate and dissipate the energy of waves generated in rivers and seas, and is also called a wave-dissipating root block, a wave-eliminating block, etc., and is used for the purpose of shore protection and water conservancy.

[0003] For this reason, various gripping devices have been proposed conventionally for gripping a wave-dissipating block. For example, in the gripping device of Patent Document 1, in order to solve the dangerous operation of hanging a wire manually, it has a configuration in which three holding members are closed to grip the joint portion of the legs extending in three directions in a plan view. That is, in Patent Document 1, since it has a configuration for gripping near the centroid portion of the wave-dissipating block, it is possible to stably grip and move the wave-dissipating block.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the gripping device shown in Patent Document 1, the three holding members are each rotated by a separate hydraulic cylinder, and the three holding members are each longer than the wave-dissipating block. For this reason, the gripping device shown in Patent Document 1 is large and heavy, making it difficult to move, and there is a risk that it cannot be fully utilized, especially during disasters.

[0006] Therefore, the present invention has been made to solve the aforementioned problems, and aims to provide a wave-dissipating block gripping device and wave-dissipating block moving method that can grip and move wave-dissipating blocks safely without the need for dangerous wire lifting work performed manually, and that can be made smaller and lighter. [Means for solving the problem]

[0007] This invention is supported by a working machine and extends in different directions from each other. , having a roughly cylindrical shape A wave-dissipating block gripping device capable of gripping a wave-dissipating block having multiple legs, comprising: a pair of holding members, each a curved plate-shaped member conforming to the legs and having their opposing tips approaching each other; a base member that pivotally supports the pair of holding members; an engagement mechanism that allows the pair of holding members to hold the radial direction of one of the multiple legs; and an engagement member having a ring member whose inner diameter is greater than or equal to the minimum outer diameter of the leg, which is held by the base member at a predetermined angle and holds the radial direction of another leg facing upward among the multiple legs, wherein the pair of holding members can support the wave-dissipating block without plastic deformation due to the weight of the wave-dissipating block, and when supporting the wave-dissipating block, the tips of the pair of holding members are moved and positioned below the engagement member and towards the center of the wave-dissipating block relative to the engagement member, thereby solving the above problem.

[0008] In this invention, an engaging member having a ring member whose inner diameter is greater than or equal to the minimum outer diameter of the leg holds the other leg of the wave-dissipating block that is facing upward. That is, since the other leg is held by the ring member, no special power source is required to hold the other leg. Furthermore, the pair of holding members can support the wave-dissipating block without plastic deformation due to the weight of the wave-dissipating block, and when supporting the wave-dissipating block, the tips of the pair of holding members are positioned below the engaging member. In other words, since the pair of holding members support most of the weight of the wave-dissipating block, the engaging member does not need to support the weight of the wave-dissipating block, and the engaging member can be made small and simple. [Effects of the Invention]

[0009] According to the present invention, it is possible to grip and move wave-dissipating blocks, and it is possible to provide a wave-dissipating block gripping device and wave-dissipating block moving method that is safer and lighter, without the need for dangerous wire lifting work performed manually. [Brief explanation of the drawing]

[0010] [Figure 1] A schematic diagram showing a work machine, a wave-dissipating block gripping device, and a wave-dissipating block according to the first embodiment of the present invention. [Figure 2] Figure 1 shows the wave-dissipating block gripping device (perspective view (A), top view (B), side view (C), front view (D)). [Figure 3] Figure 2 shows the open state of one pair of holding members of the wave-dissipating block gripping device (side view (A), front view (B)). [Figure 4]Figure 2 shows the procedure for gripping and moving a wave-dissipating block using the wave-dissipating block gripping device (Figure A: Lowering the wave-dissipating block gripping device relative to the wave-dissipating block; Figure B: Open state of one pair of holding members of the wave-dissipating block gripping device; Figure C: The engaging member of the wave-dissipating block gripping device holding the other leg; Figure D: Closed state of one pair of holding members of the wave-dissipating block gripping device; Figure E: One pair of holding members of the wave-dissipating block gripping device holding one leg; Figure F: The wave-dissipating block suspended by the wave-dissipating block gripping device). [Figure 5] A flowchart illustrating the procedure shown in Figure 4. [Figure 6] Figure 2 shows the procedure for positioning a wave-dissipating block in a predetermined location using the wave-dissipating block gripping device (Figure A: Lowering the wave-dissipating block gripping device while gripping the wave-dissipating block; Figure B: Positioning the wave-dissipating block in a predetermined location using the wave-dissipating block gripping device; Figure C: Opening a pair of holding members and releasing one leg; Figure D: Releasing the wave-dissipating block and raising the wave-dissipating block gripping device). [Figure 7] A flowchart illustrating the procedure shown in Figure 6. [Figure 8] A schematic diagram showing a work machine, a wave-dissipating block gripping device, and a wave-dissipating block according to a second embodiment of the present invention (Figure (A) shows the wave-dissipating block before being gripped by the work machine, and Figure (B) shows the wave-dissipating block after being gripped by the work machine). [Figure 9] Figure 8 shows the wave-dissipating block gripping device (perspective view (A), side view (B), front view (C), and front perspective view (D) without the engaging member). [Figure 10] Cross-sectional views illustrating the change in the distance between the tips of a pair of holding members of the wave-dissipating block gripping device shown in Figure 9 (Figure (A) shows the case when the distance between the tips of the pair of holding members is wide, and Figure (B) shows the case when the distance between the tips of the pair of holding members is narrow). [Figure 11]A diagram showing the procedure of gripping a wave dissipating block using the wave dissipating block gripping device of FIG. 9 (a diagram (A) of lowering the wave dissipating block gripping device with respect to the wave dissipating block, a diagram (B) of holding another leg portion of the wave dissipating block with an engaging member of the wave dissipating block gripping device, a diagram (C) of moving the tip portions of a pair of holding members of the wave dissipating block gripping device toward the center side of the wave dissipating block, a diagram (D) of gripping the wave dissipating block with the wave dissipating block gripping device) [Figure 12] A flowchart for explaining the procedure shown in FIG. 11 [Figure 13] A diagram showing the procedure of arranging a wave dissipating block at a predetermined position using the wave dissipating block gripping device of FIG. 9 (a diagram (A) of lowering the wave dissipating block gripping device while gripping the wave dissipating block, a diagram (B) of arranging the wave dissipating block at a predetermined position by the wave dissipating block gripping device, a diagram (C) of rotating the wave dissipating block gripping device to release the holding state of one leg portion with respect to a pair of holding members, a diagram (D) of releasing the wave dissipating block and raising the wave dissipating block gripping device) [Figure 14] A flowchart for explaining the procedure shown in FIG. 13 [Figure 15] In the working machine according to the present embodiment, a diagram of a state in which the wave dissipating block is gripped in a manner different from that of FIG. 8(B)

Mode for Carrying Out the Invention

[0011] Hereinafter, an example of the first embodiment of the present invention will be described in detail with reference to FIGS. 1 to 7.

[0012] First, based on FIG. 1, the working machine 100, the wave dissipating block gripping device 110, and the wave dissipating block CB will be schematically described.

[0013] As shown in Figure 1, the work machine 100 is, for example, a crane with outriggers (it could also be an excavator or a crane mechanism installed 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 could also be a lattice boom). A main wheel 104 is provided at the tip of the arm body 102, and a main wire Mw that suspends the wave-dissipating block gripping device 110 is engaged with it (therefore, the wave-dissipating block gripping device 110 is in a state where it can rotate accordingly around the main wire Mw). In addition, although not shown, a secondary wheel is provided at the tip of the arm body 102. A secondary wire (string-like member) Sw for controlling the opening and closing of a pair of holding members 122 of the wave-dissipating block gripping device 110 is engaged with the secondary wheel. When the feed length of the main wire Mw is not changed, the pair of retaining members 122 of the auxiliary wire Sw descend and close as the feed length increases (the tension of the auxiliary wire Sw decreases). Conversely, when the feed length of the auxiliary wire Sw decreases (the tension of the auxiliary wire Sw increases), the pair of retaining members 122 rise and open. Note that if the feed length of the main wire Mw is shortened, the wave-dissipating block gripping device 110 itself will rise. Conversely, if the feed length of the main wire Mw is lengthened, the wave-dissipating block gripping device 110 itself will descend.

[0014] As shown in Fig. 1, the wave-dissipating block CB is a concrete special-shaped block having four leg portions LP extending from the centroid position of a regular tetrahedron in the directions of the respective vertices, that is, extending in different directions from each other. As shown in Fig. 1, each of the leg portions LP of the wave-dissipating block CB has a diameter of the cross-section shortened as it approaches the end of the leg portion LP, and the diameter of the cross-section is the longest at the portion where the four leg portions LP are connected. Generally, from the viewpoint of preventing deterioration due to corrosion, the wave-dissipating block CB often does not use reinforcing bars. Therefore, the wave-dissipating block CB may be greatly damaged when local stress is applied, and in combination with its size, it is necessary to handle it carefully and accurately without applying a large stress when gripping, transporting, and installing it. As the wave-dissipating block CB that is generally used, there are a total of 18 types of sizes ranging from 0.5 tons (height 90 cm) to 80 tons (height 5 m) in weight, and the cross-section of the leg portion LP is substantially circular. In the present embodiment, the wave-dissipating block CB is assumed to be mainly usable for rivers, and is mainly 10 tons or less (for example, 6.3 tons in weight and about 2 m in height). The wave-dissipating block CB is basically manufactured near the construction site using a formwork in the required number and size.

[0015] As shown in Figure 1, the wave-dissipating block gripping device 110 is supported by the work machine 100 and is capable of gripping the wave-dissipating block CB. As shown in Figures 2(A) to (D), the wave-dissipating block gripping device 110 comprises a mounting member 112, an engagement mechanism 114, and an engagement member 126. The engagement mechanism 114 has a link mechanism 116, a base member 118, and a pair of holding members 122, and the pair of holding members 122 is capable of holding one of the four legs LP. The base member 118 pivotally supports the pair of holding members 122. The engagement member 126 has a ring member whose inner diameter is greater than or equal to the minimum outer diameter of the leg LP, and is held by the base member 118 at a predetermined angle α (for example, α = about 70 degrees). The engagement member 126 holds the other leg LP of the four legs LP that is facing upward. Furthermore, the pair of holding members 122 are designed to support the wave-dissipating block CB without undergoing plastic deformation due to the weight of the wave-dissipating block CB. In addition, when supporting the wave-dissipating block CB, the tip portions 122A of the pair of holding members 122 are positioned below the engaging member 126. In this embodiment, the wave-dissipating block gripping device 110 is designed to support a wave-dissipating block CB weighing 6.3 tons and approximately 2 m in height, for example, when the pair of holding members 122 are in the open position. (Therefore, for example, for a wave-dissipating block CB weighing 16 tons and approximately 3 m in height, the wave-dissipating block gripping device 110 can be configured to support a wave-dissipating block weighing no more than 10 tons and approximately 3 m in height.) While it is desirable to use different wave-dissipating block gripping devices 110 for each size of wave-dissipating block CB, one size of wave-dissipating block gripping device 110 is capable of gripping three or more adjacent wave-dissipating block CBs of different sizes (for example, a wave-dissipating block gripping device 110 designed for a wave-dissipating block CB weighing 6.3 tons (height 2m) can move five different sizes of wave-dissipating blocks CB weighing 3.2 tons (height 1.6m), 4 tons (height 1.8m), 5 tons (height 1.9m), 6 tons (height 2m), and 8 tons (height 2.3m)).

[0016] Next, we will describe in detail each component of the wave-dissipating block gripping device 110.

[0017] As shown in Figures 1 and 2(A) to (D), the mounting member 112 is a plate-shaped member suspended from the tip of the arm body 102 of the work machine 100 via the main wire Mw, and rotatably supports the link mechanism 116. The mounting member 112 includes, for example, a mounting body 112A formed by connecting two plate-shaped members side by side in the Y direction, as shown in Figure 2(A), and a mounting hole 112B is provided at the upper end of the mounting body 112A where a pin Pn1 is positioned. A hook Fk1 attached to the main wire Mw is slidably connected to the pin Pn1. Furthermore, as shown in Figure 2(A), a recess 112C is provided below the mounting body 112A, offset from directly below the mounting hole 112B. A pin Pn2 is positioned in the recess 112C to pivotally support the link mechanism 116 in a direction perpendicular to the direction in which the mounting body 112A extends (the X direction in Figure 2(A)) (the Y direction in Figure 2(A)). As shown in Figures 2(B) and (C), the mounting member 112 may also be provided with an arc-shaped (shown by a dashed line) limiting member 124 at the side end 112D opposite to the pin Pn1 relative to the link mechanism 116. In that case, a secondary wire Sw is inserted inside the limiting member 124.

[0018] As shown in Figure 2(A), the link mechanism 116 is connected to a pair of holding members 122 by a connecting member 120. Specifically, the link mechanism 116 comprises three strip-shaped first link members 116A and three second link members 116B. The upper ends of the three first link members 116A are rotatably supported on the mounting member 112 by pins Pn2. The lower end of one of the first link members 116A is rotatably connected by pins Pn3, sandwiched between the upper ends of the two second link members 116B. Meanwhile, the lower ends of the remaining two first link members 116A are rotatably connected by pins Pn4, sandwiching the upper end of one second link member 116B. Furthermore, the point where one second link member 116B and two second link members 116B intersect (the central part of the second link member 116B) is pivotally supported by the base member 118 by a pin Pn5. The lower ends of the second link members 116B are each integrated with the holding members 122 by a connecting member 120. Therefore, when the base member 118 is brought closer to the mounting member 112, the pair of holding members 122 are opened. Conversely, when the base member 118 is moved further away from the mounting member 112, the pair of holding members 122 are closed. In other words, the base member 118 is rotatably supported by the mounting member 112, which is suspended (by the main wire Mw) from the tip of the arm body 102 of the work machine 100, via a link mechanism 116 connected to the pair of holding members 122. The pair of retaining members 122 are opened and closed by changing the distance between the base member 118 and the mounting member 112.

[0019] As shown in Figures 2(A), (C), and (D), the base member 118 includes a frame-shaped base body portion 118A with an opening that penetrates in the Y direction. A pin Pn5 for pivotally supporting the second link member 116B is positioned approximately in the center of the base body portion 118A. A support portion 118B for attaching the engaging member 126 at a predetermined angle α (≈70 degrees) is attached to the front of the base body portion 118A. Specifically, the engaging member 126 is attached to a protrusion 118C provided on the support portion 118B in a replaceable manner with a bolt Bt. The protrusion 118C is provided with a through hole, allowing the bolt Bt to be attached.

[0020] As shown in Figure 2(A), a pair of holding members 122 are rotatably supported on the base member 118 by a second link member 116B, and are able to hold one leg LP by bringing their respective tip portions 122A closer together. The contact portion 122C of the pair of holding members 122 that contacts the leg LP is a plate-shaped member with a curved shape that conforms to the leg LP, and the opposing tip portions 122A are brought closer together. That is, as shown in Figure 3(B), the distance L1 is made larger than the distance L, so that even if the extreme ends of the tip portions 122A come into contact with each other, the main body portions 122B do not come into contact with each other. In this embodiment, it is desirable that the tip portions 122A have a shape in which the curvature decreases as they go further forward (the minimum curvature may be the curvature of the leg LP held by the pair of holding members 122). The main body portion 122B of the holding member 122 is integrated with the lower end of the second link member 116B by the connecting member 120. The contact portion 122C of the holding member 122 that directly contacts the leg portion LP is chamfered (the contact portion 122C may be made of a cushioning material such as rubber and be replaceable). Therefore, even when the leg portion LP is held by a pair of holding members 122, there are few parts that make sharp contact with the leg portion LP. Consequently, localized stress on the wave-dissipating block CB can be avoided, and damage to the leg portion LP can be prevented. The engagement mechanism 114, including the pair of holding members 122, is made of steel with iron as the main component, and is capable of supporting the wave-dissipating block CB without plastic deformation due to the weight of the wave-dissipating block CB.

[0021] The engaging member 126 has a ring-shaped ring member whose inner diameter is greater than or equal to the minimum outer diameter of the leg portion LP. Specifically, the engaging member 126 comprises an engaging end portion 126A and an engaging body portion 126B. The engaging end portion 126A is a terminal with a ring formed on the protrusion 118C that is easy to fix with a bolt Bt. The engaging body portion 126B is a steel wire rope curved into a ring shape with a thickness of 1 cm or more (the thickness is appropriately changed depending on the weight of the wave-dissipating block CB) (for example, in a form that forms an arc of 2 / 3 or more of a circle), and constitutes the ring member. For this reason, the engaging member 126 has lower rigidity than a pair of retaining members 122 and is lighter than a pair of retaining members 122. At least a part of the outer circumference of the engaging body portion 126B may be covered with a cushioning material such as rubber. If this cushioning material is present, it is possible to prevent the wire from directly contacting the leg portion LP, and further prevent damage to the wave-dissipating block CB. In this embodiment, multiple engagement body portions 126B (steel wire ropes) of different lengths are prepared as engagement members 126, and an engagement body portion 126B with a length corresponding to the size of the wave-dissipating block CB to be gripped is selected, and the engagement end portion 126A is fixed to the protrusion 118C of the support portion 118B. Therefore, an engagement member 126 that is suitable for the wave-dissipating block CB to be gripped can be quickly prepared. The protrusion 118C is provided on the support portion 118B, and the engagement member 126 is held on the base member 118 at a predetermined angle α. However, this is not limited to this, and the length of the steel wire rope that is the engagement body portion may be adjustable when it is fixed to the support portion (of course, the engagement member does not have to be a steel wire rope).

[0022] A connecting member 128 is connected to the connecting member 120. The connecting member 128 is, for example, a steel wire rope that is divided into two branches (it may also be made up of a combination of plate-shaped members), with two lower ends attached to the connecting member 120 and one upper end having a handle. A hook Fk2 attached to the auxiliary wire Sw is attached to this handle. As can be seen from comparing Figure 2(C) and Figure 3(A) (or Figure 2(D) and Figure 3(B)), the distance of the base member 118 to the mounting member 112 can be changed by changing the feed length of the auxiliary wire Sw, which is connected to the connecting member 128 that extends from the tip of the arm body 102 of the work machine 100 and is connected to a pair of holding members 122.

[0023] The plane on which the pair of holding members 122 rotate (rotation plane) PL is also the plane on which the link mechanism 116 expands and contracts, and the center of gravity of the wave-dissipating block gripping device 110 lies almost entirely on the rotation plane PL. However, the position of pin Pn1 is supported by the main wire Mw on the mounting member 112. Here, as shown in Figure 3(A), the position of pin Pn1 is far from the rotation plane PL. Therefore, when the weight of the wave-dissipating block gripping device 110 is almost entirely supported by the main wire Mw, the rotation plane PL is inclined with respect to the vertical direction (Z direction), as shown in Figure 4(A). That is, the mounting member 112 is suspended such that the rotation plane PL on which the pair of holding members 122 rotate intersects the vertical direction (Z direction) when the distance between the mounting member 112 and the base member 118 is at its maximum.

[0024] Next, the procedure for gripping and moving the wave-dissipating block CB using the wave-dissipating block gripping device 110 in this embodiment will be explained with reference to Figures 4(A) to (F) and Figure 5.

[0025] First, select the engagement member 126 that is compatible with the identified wave-dissipating block CB and attach it to the support part 118B.

[0026] Next, the work machine 100 increases the feed length of the main wire Mw, thereby lowering the wave-dissipating block gripping device 110 from above the wave-dissipating block CB (Figure 4(A), Figure 5 step S2). At this time, the secondary wire Sw is fed out with the same feed amount as the main wire Mw, with almost no tension applied to the secondary wire Sw. The rotating plane PL is suspended so as to intersect with the vertical direction, as described above.

[0027] Then, before the wave-dissipating block gripping device 110 approaches the wave-dissipating block CB, the feed length of the sub-wire Sw relative to the main wire Mw is shortened (Figure 5, step S4). As a result, the base member 118 approaches the mounting member 112, the rotation plane PL becomes an angle close to the vertical, the distance L between the pair of holding members 122 increases, and the pair of holding members 122 opens (Figure 5, step S6, Figure 4(B)).

[0028] Next, the position of the tip of the arm body 102 is adjusted as needed, and the feed length of the main wire Mw is increased while keeping the pair of holding members 122 in the open position. Then, the wave-dissipating block gripping device 110 is lowered and the other leg LP facing upward is held by the engaging member 126 (Figure 4(C), Figure 5 step S8).

[0029] Next, the work machine 100 moves the engagement mechanism 114 closer to one leg LP while maintaining the holding state of the engagement member 126 (Figure 5, step S10). Then, the auxiliary wire Sw is released. In other words, the feed length of the auxiliary wire Sw relative to the main wire Mw is increased (Figure 5, step S12). As a result, due to the weight of the base member 118 and the pair of holding members 122, the tips 122A of the pair of holding members 122 extend downward to the maximum movable length of the link mechanism 116 until they contact the ground GD or the like, or until the pair of holding members 122 contact one leg LP. At the same time, the distance between the pair of holding members 122 is shortened (Figure 5, step S14). At that time, the wave-dissipating block gripping device 110 is almost entirely supported by the main wire Mw, so the rotation plane PL tilts again so as to intersect with the vertical direction, and the tips 122A of the pair of holding members 122 move towards the center of the wave-dissipating block CB. Then, the tips 122A of the pair of holding members 122 are positioned below the engaging member 126 (Figure 4(D)).

[0030] Next, the work machine 100 lifts the wave-dissipating block gripping device 110 with the main wire Mw while keeping the sub-wire Sw released. As a result, the position of the pin Pn1 supported by the main wire Mw is away from the rotation plane PL, causing the tip 122A of the pair of holding members 122 to move further toward the center of the wave-dissipating block CB, and the displacement in the direction of the rotation plane PL and the vertical direction becomes even larger. Then, the weight of the wave-dissipating block CB is applied to the tip 122A of the pair of holding members 122, narrowing the distance L1 between the pair of holding members 122 to a minimum, and the pair of holding members 122 of the engagement mechanism 114 firmly holds one leg LP (Figure 4(E), Figure 5 step S16).

[0031] Then, the work machine 100 raises the wave-dissipating block gripping device 110, separating the wave-dissipating block CB from the ground GD. As a result, the weight of the wave-dissipating block CB is added to the weight of the wave-dissipating block gripping device 110, changing the position angle of the wave-dissipating block gripping device 110 and changing the inclination of the rotation plane PL so that it returns to the vertical direction. With the work machine 100 still in this position, the wave-dissipating block gripping device 110 is raised (Figure 4(F)) and moved, thereby moving the wave-dissipating block CB (Figure 5, step S18).

[0032] Next, the procedure for positioning the wave-dissipating blocks CB in the predetermined location using the wave-dissipating block gripping device 110 will be explained with reference to Figures 6(A) to (D) and Figure 7.

[0033] First, the work machine 100 moves the wave-dissipating block gripping device 110, which is gripping the wave-dissipating block CB, upward to a predetermined position.

[0034] Next, the wave-dissipating block CB is lowered by the work machine 100 (Figure 6(A), Figure 7 step S20). Then, the wave-dissipating block CB is positioned in the predetermined location (Figure 6(B), Figure 7 step S22).

[0035] Next, tension is applied to the auxiliary wire Sw to shorten its feed length and bring the base member 118 closer to the mounting member 112. This increases the distance L between the tips 122A of the pair of retaining members 122 (Figure 7, step S26), and one leg LP formed by the pair of retaining members 122 is released (Figure 6(C), Figure 7, step S28).

[0036] Then, the work machine 100 raises the wave-dissipating block gripping device 110, releasing the other leg LP from being held, and separating the wave-dissipating block gripping device 110 from the wave-dissipating block CB (Figure 6(D), Figure 7 step S30).

[0037] Thus, in this embodiment, the device is equipped with an engagement mechanism 114 and an engagement member 126 that hold the radial direction of each of the two leg sections LP. Therefore, the wave-dissipating block gripping device 110 does not require a mechanism large enough to embrace an entire leg section LP.

[0038] For example, in conventional technology, a gripping device for a wave-dissipating block weighing approximately 16 tons and with a height of approximately 3m would weigh approximately 12 tons and have a height of approximately 6m. However, the wave-dissipating block gripping device 110 of this embodiment can be constructed to weigh less than 10 tons and have a height of less than 3m at most.

[0039] Furthermore, in this embodiment, one leg LP is held by a pair of holding members 122, and the other leg LP is held by an engaging member 126. As a result, the stress on the wave-dissipating block CB can be reduced compared to the conventional technology (when supported by three members). In other words, it is possible to further prevent damage to the wave-dissipating block CB.

[0040] Furthermore, in this embodiment, the engaging member 126 holds the other leg LP. That is, since the other leg LP is held by the ring member, no special power source is required to hold the other leg LP. Also, the pair of holding members 122 can support the wave-dissipating block CB without plastic deformation due to the weight of the wave-dissipating block CB. At the same time, when supporting the wave-dissipating block CB, the tip portions 122A of the pair of holding members 122 are positioned below the engaging member 126. In other words, the pair of holding members 122 support most of the weight of the wave-dissipating block CB, so the engaging member 126 does not need to support the weight of the wave-dissipating block CB, and the engaging member 126 can be made small and simple.

[0041] Furthermore, in this embodiment, the engaging member 126 is, for example, a steel wire rope, which has lower rigidity than the pair of holding members 122 and is lighter than the pair of holding members 122. Therefore, when the engaging member 126 holds another leg LP that is facing upward, it is possible to easily hold the leg LP with the engaging member 126 even if the positions of the leg LP and the engaging member 126 are slightly misaligned. At the same time, because the engaging member 126 is lightweight, the wave-dissipating block gripping device 110 itself can be made lighter and less expensive, and it can be easily and stably operated by the work machine 100, making it possible to handle the wave-dissipating block CB more stably. However, this is not limited to this, and the engaging member may have higher rigidity than the pair of holding members, or it may be heavier than the pair of holding members.

[0042] Furthermore, in this embodiment, the base member 118 is rotatably supported by a mounting member 112 suspended from the tip of the arm body 102 of the work machine 100, via a link mechanism 116 connected to a pair of holding members 122. The pair of holding members 122 are opened and closed by changing the distance of the base member 118 relative to the mounting member 112. In other words, because a link mechanism 116 is used, the opening and closing of the pair of holding members 122 is performed by the descent of the pair of holding members 122. That is, the weight of the wave-dissipating block CB is applied to the contact portion 122C of the pair of holding members 122, causing the pair of holding members 122 to descend more reliably. As a result, the pair of holding members 122 are reliably and automatically closed, eliminating the need for a large power source to generate the force required to open and close the pair of holding members 122. In other words, the wave-dissipating block gripping device 110 can be made simpler and lighter. At the same time, since a large power source is not required, the hydraulics and wiring to supply power for driving that large power source are also unnecessary, resulting in a high degree of freedom in the placement of the wave-dissipating block gripping device 110. However, this is not the only option; a configuration without a link mechanism is also possible, and even if a link mechanism is used, it is not necessary to employ a method that changes the distance of the base member relative to the mounting member.

[0043] Furthermore, in this embodiment, the curvature of the tip portions 122A of the pair of retaining members 122 decreases towards the end. Therefore, even if the weight of the pair of retaining members 122 and the base member 118 is not large, the weight of the wave-dissipating block CB is more effectively applied to the tip portions 122A via the contact portions 122C of the pair of retaining members 122. That is, the pair of retaining members 122 descend more reliably, the tip portions 122A of the pair of retaining members 122 close, and the distance between the pair of retaining members 122 is reliably minimized. This makes it possible to hold the wave-dissipating block CB more reliably. However, this is not the only embodiment, and the curvature of the tip portions of the pair of retaining members does not necessarily have to decrease towards the end.

[0044] Furthermore, in this embodiment, when the distance between the mounting member 112 and the base member 118 is at its maximum, the mounting member 112 is suspended such that the rotation plane PL of the pair of holding members 122 intersects the vertical direction. That is, when the base member 118 descends relative to the mounting member 112, causing the pair of holding members 122 to descend, the wave-dissipating block gripping device 110 is supported almost entirely by the main wire Mw. At this time, the rotation plane PL is inclined, and the tips 122A of the pair of holding members 122 move in the direction of the pin Pn1, i.e., below the engaging member 126. In other words, the tips 122A of the pair of holding members 122 move toward the center of the wave-dissipating block CB, so that the tips 122A always support a portion close to the center of gravity of the wave-dissipating block CB, making it possible to hold the wave-dissipating block CB more safely and securely. However, this is not the only embodiment, and the mounting member does not necessarily have to be suspended such that the rotation plane PL intersects the vertical direction.

[0045] Furthermore, in this embodiment, the distance of the base member 118 to the mounting member 112 can be changed by changing the feed length of the sub-wire Sw, which is connected to a connecting member 128 that extends from the tip of the arm body 102 of the work machine 100 and is connected to a pair of holding members 122. Therefore, no special control device is required to change the distance of the base member 118 to the mounting member 112. In other words, the preparation and operation of the wave-dissipating block gripping device 110 can be performed more simply than in the conventional method. At the same time, since the distance of the base member 118 to the mounting member 112 is changed by the sub-wire Sw, which extends and retracts in the same direction as the main wire Mw, it is possible to ensure a high degree of freedom in the placement of the wave-dissipating block gripping device 110. In addition, the tension of the sub-wire Sw directly raises and lowers the pair of holding members 122. Therefore, compared to the case where the sub-wire Sw is directly connected to the base member 118, the amount of extension and retraction of the sub-wire Sw is larger, and it is possible to open and close the pair of holding members 122 quickly and accurately. Furthermore, the auxiliary wire Sw may be directly connected to the base member. In fact, since the pair of retaining members automatically close due to their own weight and the weight of the wave-dissipating block CB, for example, electromagnetic magnets may be provided on the mounting member and the base member, and the attachment and detachment of the mounting member and the base member may be controlled by wireless remote operation.

[0046] Furthermore, in this embodiment, the mounting member 112 may be provided with an arc-shaped limiting member 124 at its side end 112D, and a secondary wire Sw may be inserted inside the limiting member 124. In this case, the feeding direction of the secondary wire Sw is always approximately parallel to the rotation plane PL and coincides with the movement direction of the base member 118 relative to the mounting member 112. Therefore, regardless of the state of the wave-dissipating block CB or the orientation of the wave-dissipating block gripping device 110, it is possible to stably control the opening and closing of the pair of holding members 122. However, this is not the only option, and a limiting member may be omitted. In particular, the orientation of the wave-dissipating block gripping device gripping the wave-dissipating block CB does not change significantly in most cases.

[0047] Therefore, in this embodiment, it is possible to grip and move wave-dissipating blocks CB, and it is possible to provide a smaller and lighter wave-dissipating block gripping device 110 and wave-dissipating block moving method that is safe and does not require dangerous wire lifting work by hand. In other words, the wave-dissipating block gripping device 110 can be manufactured at a lower cost than the conventional technology, and gripping, transporting, installing, and using are all easy. For this reason, the wave-dissipating block gripping device 110 makes it possible to move wave-dissipating blocks CB quickly and reliably, for example, in emergency situations when there is a risk of dike collapse.

[0048] Although the present invention has been described with reference to the first embodiment, the present invention is not limited to the first embodiment. That is, it goes without saying that improvements and design changes are possible without departing from the spirit of the present invention.

[0049] In the first embodiment, the wave-dissipating block gripping device 110 was suspended from the work machine 100 via a main wire Mw, but the present invention is not limited to this. For example, it may be as shown in the second embodiment in Figures 8 to 15. In the second embodiment, the wave-dissipating block gripping device 210 is directly attached to the arm body 202 of the work machine 200 so that its posture can be freely controlled. The second embodiment will be described below.

[0050] In this embodiment, the work machine 200 is a backhoe with a bendable arm body 202, as shown in Figures 8(A) and (B). The arm body 202 is pivotably supported on the main body 201. The wave-dissipating block gripping device 210 is attached and supported to the support shaft 202A and link shaft 202B provided at the tip of the arm body 202, similar to a normal work attachment (for example, a cutter or a grapple). In other words, the wave-dissipating block gripping device 210 is pivotably supported at the tip of the arm body 202 of the work machine 200.

[0051] As shown in Figures 9(A) to (C), the wave-dissipating block gripping device 210 comprises an engagement mechanism 214 and an engagement member 226. The engagement mechanism 214 comprises a base member 218, a pair of holding members 222, and an adjustment mechanism 230. As shown in Figure 9(B), the engagement members 226 are provided on the front and back of the base member 218, respectively, and the wave-dissipating block gripping device 210 is symmetrical with respect to the pair of holding members 222 (or the rotating plane PL).

[0052] As shown in Figures 8(A) and (B), the base member 218 is connected to the support shaft 202A and the link shaft 202B of the arm body 202. The base member 218 is a component that changes the posture of the wave-dissipating block gripping device 210 by changing the position of the link shaft 202B relative to the support shaft 202A. In other words, the base member 218 is pivotably supported at the tip of the arm body 202 of the work machine 200. Specifically, the base member 218 comprises a base body portion 218A, a support portion 218B, and a base mounting portion 218C. The base body portion 218A is a frame-shaped component with an opening that penetrates in the Y direction as shown in Figure 9(A). Through holes 218AB and 218AC are provided in the center of the upper plate 218AA and the lower surface of the base body portion 218A, respectively, through which the rod portion 234B of the displacement member 234, which will be described later, is rotatably supported. Furthermore, protrusions are provided on both sides of the lower ends of the front and rear of the base body 218A to rotatably support a pair of retaining members 222 by pins Pn6. The support portion 218B is provided on the front and rear of the base body 218A as shown in Figure 9(B), and the engaging member 226 is attached at a predetermined angle α (≒70 degrees) (the support portion 218B corresponds to the support portion 118B and protrusion 118C of the first embodiment). The engaging member 226 is attached to the support portion 218B in a replaceable manner by bolts Bt. The base mounting portion 218C consists of two plate-shaped members integrally attached to the top plate 218AA of the base body 218A. The two base mounting portions 218C are more firmly integrated with the top plate 218AA by two reinforcing portions 218CA. The base mounting portion 218C, as shown in Figure 9(B), is symmetrical with respect to the rotation plane PL and is equipped with support holes 218D that can be attached to either the support shaft 202A or the link shaft 202B. The two support holes 218D are also provided in symmetrical positions. A rotating device (which may be configured to enable rotation depending on the balance of weight, or it may be equipped with a drive unit that controls the rotation angle) may be provided in the upper plate 218AA (between the base body portion 218A and the base mounting portion 218C).

[0053] As shown in Figure 9(A), a pair of holding members 222 are pivotally supported on the base member 218 by pins Pn6 on protrusions provided on the front and back of the base body 218A. The pair of holding members 222 are able to hold one leg LP by adjusting the distance between their respective tip portions 222A to a predetermined distance. The contact portion 222C of the pair of holding members 222 that contacts the leg LP is a curved plate-like member that conforms to the shape of the leg LP, and the opposing tip portions 222A are brought close together. That is, as shown in Figures 10(A) and (B), the distance L1 is greater than the distance L. In this embodiment, the curvature is approximately constant from the main body portion 222B to the tip portion 222A, excluding the very tip. The main body portion 222B of the holding member 222 is pivotally supported by pins Pn6. The rear end portion 222D, which is integrated with the main body portion 222B, is formed in a circular arc shape (in this embodiment, a circular arc shape of approximately 2 / 3 or more of a circle). The contact portion 222C, which is in direct contact with the leg portion LP, has the same configuration as in the first embodiment, so its description is omitted. Furthermore, at least one pair of holding members 222 and the base member 218 are made of steel material mainly composed of iron, as in the first embodiment, and are capable of supporting the wave-dissipating block CB without plastic deformation due to the weight of the wave-dissipating block CB.

[0054] As shown in Figures 9(D), 10(A), and (B), the adjustment mechanism 230 is located inside the base member 218 and engages with the rear end 222D of a pair of retaining members 222. The adjustment mechanism 230 allows the distance between the tip portions 222A to be adjusted to be greater than or equal to the minimum outer diameter of the leg portion LP and less than the maximum outer diameter. Specifically, the adjustment mechanism 230 comprises a covering member 232 and a displacement member 234.

[0055] As shown in Figures 9(D), 10(A), and (B), the covering member 232 is a member that slidably covers the rear end portion 222D, which has a circular arc-shaped cross-section, and comprises a T-shaped upper covering portion 232A and a lower covering portion 232B. The upper covering portion 232A and the lower covering portion 232B are arranged to sandwich the rear end portion 222D facing each other. In the central part of the upper covering portion 232A and the lower covering portion 232B that directly face each other, screw holes 232AA and 232BA are provided, respectively, which are screwed into threads provided on the surface of the rod portion 234B of the displacement member 234.

[0056] As shown in Figures 10(A) and (B), the displacement member 234 is supported by the base member 218 and displaces the covering member 232 in a direction perpendicular to the opening and closing direction of the pair of holding members 222. The displacement member 234 is a member that moves the covering member 232 vertically, i.e., in the Z direction in Figures 10(A) and (B), inside the base body 218A. The displacement member 234 comprises end portions 234A and 234C and a rod portion 234B. The end portions 234A and 234C are members attached to both ends of the rod portion 234B. The end portions 234A and 234C prevent the rod portion 234B from falling off the base body 218A, even though it is rotatably supported by the through holes 218AB and 218AC in the base body 218A. The ends 234A and 234C are rotatable from the outside with a tool (e.g., a spanner or wrench). The rod portion 234B is cylindrical with threads and is screwed into the threaded holes 232AA and 232BA of the covering member 232. Therefore, by rotating either end 234A or end 234C, the rod portion 234B rotates, causing the covering member 232 to move up and down, and the rear end portion 222D, which is gripped by the covering member 232, to move up and down. This causes the pair of retaining members 222 to open and close with the pin Pn6 as the pivot point (in Figure 10(A), the covering member 232 is lowered and the pair of retaining members 222 are in the open position; in Figure 10(B), the covering member 232 is raised and the pair of retaining members 222 are in the closed position). In this embodiment, the position of the covering member 232 is adjusted in advance to match the size of the wave-dissipating block CB to be gripped, and the degree to which the pair of holding members 222 are opened is determined.

[0057] As shown in Figures 9(A) to (C), the engaging member 226 has a ring-shaped ring member whose inner diameter is greater than or equal to the minimum outer diameter of the leg portion LP. Furthermore, the engaging member 226 has lower rigidity than the pair of retaining members 222 and is lighter than the pair of retaining members 222. In other words, the engaging member 226 has the same configuration as the engaging member 126 of the first embodiment, and a detailed explanation is omitted.

[0058] Next, the procedure for gripping and moving the wave-dissipating block CB using the wave-dissipating block gripping device 210 in this embodiment will be explained with reference to Figures 11(A) to (D) and Figure 12.

[0059] First, the wave-dissipating block CB is identified, and the distance L between the tips 222A of the pair of retaining members 222 is adjusted (Figure 12, step S32). Specifically, the distance L between the tips 222A of the pair of retaining members 222 is adjusted using the adjustment mechanism 230 to be greater than or equal to the minimum outer diameter and less than the maximum outer diameter of the leg LP, so that the tips 222A of the pair of retaining members 222 can pass over the tips of the leg LP and hold the thicker portion of the leg LP. At the same time, an engaging member 226 that fits the identified wave-dissipating block CB is selected and attached to the support part 218B.

[0060] Next, the work machine 200 lowers the wave-dissipating block gripping device 210 from above the wave-dissipating block CB (Figure 11(A), Figure 12, step S34). At this time, if necessary, the work machine 200 adjusts the orientation and position of the wave-dissipating block gripping device 210 based on the position of the wave-dissipating block CB.

[0061] Furthermore, the wave-dissipating block gripping device 210 is lowered, and the other leg LP facing upward is held by the engaging member 226 (Figure 12, step S36). Then, the tip portion 222A is moved to the end of one leg LP (Figure 11(B), Figure 12, step S38), and the tip portion 222A of the pair of holding members 222 is passed over one leg LP.

[0062] Next, the work machine 200 further rotates the wave-dissipating block gripping device 210 while maintaining the holding state of the engaging member 226, moving the leg LP to a position greater than the distance L between the tips 222A of the pair of holding members 222, i.e., towards the center of the wave-dissipating block CB (Figure 12, step S40). In other words, the tips 222A of the pair of holding members 222 are positioned below the engaging member 226, so that one leg LP is held by the pair of holding members 222 (Figure 11(C), Figure 12, step S42). As a result, one leg LP is held by the pair of holding members 222, and the other leg LP does not come off the engaging member 226.

[0063] Then, the wave-dissipating block gripping device 210 is raised (Figure 11(D)) and moved by the work machine 200, thereby moving the wave-dissipating block CB (Figure 12, step S44). At this time, the work machine 200 can grip the wave-dissipating block CB using, for example, the configuration shown in Figure 8(B), that is, using the engaging member 226 on the main body side of the work machine 200 and a pair of holding members 222.

[0064] Next, the procedure for positioning the wave-dissipating blocks CB in a predetermined location using the wave-dissipating block gripping device 210 in this embodiment will be explained with reference to Figures 13(A) to (D) and Figure 14.

[0065] First, the work machine 200 moves the wave-dissipating block gripping device 210, which is gripping the wave-dissipating block CB, upward to a predetermined position.

[0066] Next, the wave-dissipating block gripping device 210 is lowered by the work machine 200 (Figure 13(A), Figure 14 step S50). Then, the wave-dissipating block CB is positioned in the predetermined location (Figure 13(B), Figure 14 step S52).

[0067] Next, the work machine 200 rotates the wave-dissipating block gripping device 210 to move the tip portions 222A of the pair of holding members 222 from the base of the leg LP being held toward the end of the leg LP (Figure 14, step S54). Once the tip portions 222A can pass over the leg LP, the rotation of the wave-dissipating block gripping device 210 is stopped, releasing the holding state of one leg LP by the pair of holding members 222 (Figure 13(C), Figure 14, step S56).

[0068] Then, the work machine 200 raises the wave-dissipating block gripping device 210, releasing the other leg LP from its grip, and separating the wave-dissipating block gripping device 210 from the wave-dissipating block CB (Figure 13(D), Figure 14, step S58).

[0069] Thus, in this embodiment, the base member 218 is pivotably supported at the tip of the arm body 202 of the work machine 200. The engagement mechanism 214 is equipped with an adjustment mechanism 230 that allows the distance L between the tip portions 222A to be adjusted to be greater than or equal to the minimum outer diameter of the leg portion LP and less than the maximum outer diameter. In other words, in this embodiment, the wave-dissipating block CB can be gripped by a work machine 200 such as a backhoe, and transported and installed while controlling its posture. At the same time, the wave-dissipating block CB can be gripped and transported simply by pre-adjusting the distance L between the tip portions 222A of the pair of holding members 222 to match the wave-dissipating block CB being handled. In other words, the wave-dissipating block gripping device 210 does not require a drive source to drive the pair of holding members 222. The adjustment mechanism 230 is located inside the base member 218. Therefore, the wave-dissipating block gripping device 210 can be made smaller and lighter (for example, while the wave-dissipating block gripping device 110 of the first embodiment can reduce the weight of a wave-dissipating block CB weighing 6 tons to about 2 tons, the wave-dissipating block gripping device 210 of this embodiment can reduce the weight by another 0.5 tons). Therefore, in this embodiment, when the work machine 200 is a backhoe weighing around 100 tons, by attaching the wave-dissipating block gripping device 210 of this embodiment, it is possible to freely move and position wave-dissipating blocks CB, which mainly weigh around 10 tons and are used in rivers. In other words, wave-dissipating blocks CB, which could not be positioned to the desired predetermined location sufficiently with a crane truck or a barge equipped with a crane, can be positioned more accurately and quickly. At the same time, it is possible to quickly move and stack wave-dissipating blocks CB to the vicinity of the location in an emergency, such as during heavy rains when the risk of levee breach increases. However, the engagement mechanism is not limited to this, and may include a pair of holding members and a base member that pivotally supports the pair of holding members, as long as the pair of holding members can hold one of the multiple legs LP.

[0070] Furthermore, in this embodiment, the adjustment mechanism 230 comprises a covering member 232 and a displacement member 234. That is, since the adjustment mechanism 230 comprises only two members, the wave-dissipating block gripping device 210 can be made simpler in configuration, promoting cost reduction. At the same time, the covering member 232 adjusts and determines the distance L between the tips 222A of the pair of holding members 222 by the displacement of the pair of holding members 222 in a direction perpendicular to the opening and closing direction of the pair of holding members 222. Therefore, even if a large external force is suddenly applied in the opening and closing direction of the pair of holding members 222, there is no risk that the distance L will change significantly. In other words, for example, even if, while gripping a wave-dissipating block CB on site, the side of the pair of holding members 222 is violently struck against another wave-dissipating block CB in the opening and closing direction of the pair of holding members 222, it is possible to continue gripping the gripped wave-dissipating block CB stably. Furthermore, the adjustment mechanism does not necessarily have to consist of only two members, nor does it have to adjust the distance L between a pair of retaining members by displacement in a direction perpendicular to the opening and closing direction of the pair of retaining members.

[0071] Furthermore, in this embodiment, the engaging members 226 are provided on the front and back of the base member 218, respectively, and the wave-dissipating block gripping device 210 is symmetrical with respect to the pair of holding members 222. Therefore, there is no directionality when attaching the wave-dissipating block gripping device 210 to the arm body 202, making it easy to attach the wave-dissipating block gripping device 210. In addition, the work machine 200 can not only grip, transport, and install the wave-dissipating block CB in the form shown in Figure 8(B), but can also grip, transport, and install the wave-dissipating block CB in the form shown in Figure 15. In other words, when transporting and installing the wave-dissipating block CB with the work machine 200, if the wave-dissipating block CB is reasonably small, it is possible to transport and install the wave-dissipating block CB in the form shown in Figure 8(B). However, even if the intention is to use it in the form shown in Figure 8(B), the wave-dissipating block CB may be large and collide with the arm body 202. In that case, by using an engaging member 226 that is separated from the main body of the work machine 200 for a pair of holding members 222, it is possible to transport and install larger wave-dissipating blocks CB. In other words, by using the wave-dissipating block gripping device 210 of this embodiment, it is possible to handle wave-dissipating blocks CB of different sizes freely. However, the wave-dissipating block gripping device is not limited to this configuration, and may also be configured to have only one engaging member.

[0072] In the above embodiment, the wave-dissipating block CB was configured to have four legs LP (with a radial cross-section that is circular and tapers towards the tip) extending from the centroid of a regular tetrahedron, but it is not limited to this configuration. For example, the wave-dissipating block CB may have multiple (two or more) legs LP extending in different directions, and the radial cross-sectional shape of the legs LP may not be a circle, but an ellipse, a polygon, or a combination thereof.

[0073] In the above embodiment, the predetermined angle α was approximately 70 degrees, but it may also be an acute angle greater than 0 degrees and less than 90 degrees. Even in this case, it is possible to prevent the gripping of wave-dissipating blocks CB that are too large and heavy compared to the size of the wave-dissipating block gripping device, thereby preventing the wave-dissipating blocks CB from falling or the wave-dissipating block gripping device from being damaged. [Industrial applicability]

[0074] This invention is suitable for moving, transporting, and installing wave-dissipating blocks that have multiple legs extending in different directions and are used in rivers and harbors. [Explanation of Symbols]

[0075] 100, 200... Work machines 101, 201... Main unit 102, 202... Arm bodies 104... Main wheel 110, 210... Wave-dissipating block gripping device 112…Mounting parts 112A...Mounting body 112B, 212A… Mounting holes 112C…recess 112D…Side end 114, 214… Engagement mechanism 116... Link mechanism 116A…First link member 116B...Second link member 118, 218... Base components 118A, 218A... Base body 118B, 218B...Support part 118C…Convex part 120... Connecting member 122, 222... Retaining members 122A, 222A...Tip 122B, 222B…Main body 122C, 222C…Contact part 124…Restricting member 126, 226… Engaging members 126A, 226A…Engagement end 126B, 226B...Engagement main body part 128...Connecting member 202A…Support shaft 202B... Link axis 218AA…Top plate 218AB, 218AC...Through hole 218C... Base mounting section 218CA…Reinforcement section 218D…Support hole 222D…Rear end 230...adjustment mechanism 232... Covering member 232A... Upper part of the covering 232AA, 232BA...Threaded hole 232B... Lower part of the covering 234... Displacement member 234A, 234C...end 234B...Rod section Bt... Bolt CB... wave-dissipating blocks GD…Ground Fk1, Fk2... hooks LP…legs Mw... Main wire L, L1…distance Pn1, Pn2, Pn3, Pn4, Pn5, Pn6... pins PL...Rotational plane Sw... Sub-wire α…Angle

Claims

1. A wave-dissipating block gripping device that is supported by a work machine and capable of gripping a wave-dissipating block having a plurality of legs that extend in different directions from each other and have a substantially cylindrical shape, The device comprises a pair of holding members, each having a curved plate-like shape that conforms to the leg portion, with their opposing tip portions approaching each other, and a base member that pivotally supports the pair of holding members, and an engagement mechanism in which the pair of holding members can hold the radial direction of one of the plurality of legs, An engaging member having a ring member whose inner diameter is greater than or equal to the minimum outer diameter of the leg, which is held by the base member at a predetermined angle and holds the radial direction of one of the multiple legs that is facing upward, Equipped with, The pair of holding members are capable of supporting the wave-dissipating block without plastic deformation due to the weight of the wave-dissipating block, and when supporting the wave-dissipating block, the tips of the pair of holding members are moved and positioned below the engaging member and towards the center of the wave-dissipating block. A wave-dissipating block gripping device characterized by the following features.

2. In claim 1, The wave-dissipating block gripping device is characterized in that the engaging member has lower rigidity than the pair of holding members and is lighter than the pair of holding members.

3. In claim 1 or 2, The base member is pivotably supported at the tip of the arm body of the work machine, The pair of retaining members has a substantially constant curvature up to the tip of the pair of retaining members. The wave-dissipating block gripping device is characterized in that the engagement mechanism is located inside the base member and engages with the rear ends of the pair of holding members, and includes an adjustment mechanism that allows the distance between the tips of the pair of holding members to be greater than or equal to the minimum outer diameter of the leg portion and less than the maximum outer diameter.

4. In claim 3, The wave-dissipating block gripping device is characterized by comprising: a covering member that slidably covers the rear end portion having a cross-section shaped like an arc; and a displacement member supported by the base member that displaces the covering member in a direction perpendicular to the opening and closing direction of the pair of holding members.

5. In any of claims 1 to 4, The engaging members are provided on the front and back surfaces of the base member, respectively. The wave-dissipating block gripping device is characterized in that it has a symmetrical shape with respect to the pair of holding members.

6. In claim 1 or 2, The base member is rotatably supported by a mounting member suspended from the tip of the arm body of the work machine via a link mechanism connected to the pair of holding members. The tip of the pair of retaining members has a curvature that decreases towards the end. A wave-dissipating block gripping device characterized in that the pair of holding members are opened and closed by changing the distance of the base member to the mounting member.

7. In claim 6, The wave-dissipating block gripping device is characterized in that, when the distance between the mounting member and the base member is at its maximum, the mounting member is suspended such that the rotating plane of the pair of holding members intersects the vertical direction.

8. In claim 6 or 7, A wave-dissipating block gripping device characterized in that the distance of the base member to the mounting member can be changed by changing the feed length of a string-like member connected to a connecting member that extends from the tip of the arm body of the work machine and is connected to the pair of holding members.

9. In claim 8, The wave-dissipating block gripping device is characterized in that the mounting member is provided with an arc-shaped limiting member at its side end, and the string-like member is inserted inside the limiting member.

10. A wave-dissipating block moving method, which involves gripping and moving a wave-dissipating block using a wave-dissipating block gripping device that is supported by a work machine and has multiple legs that extend in different directions and have a substantially cylindrical shape, The wave-dissipating block gripping device comprises a pair of holding members, each a curved plate-shaped member conforming to the leg portion, with their opposing tip portions approaching each other; a base member that pivotally supports the pair of holding members; an engagement mechanism that allows the pair of holding members to hold the radial direction of one of the plurality of legs; and an engagement member having an inner diameter greater than or equal to the minimum outer diameter of the leg portion, which is held by the base member at a predetermined angle and holds the radial direction of another leg of the plurality of legs facing upward. The process involves using the aforementioned work machine to lower the wave-dissipating block gripping device from above the wave-dissipating block, and holding the other upward-facing leg with the engaging member, The process involves using the aforementioned work machine to move and position the tips of the pair of holding members below the engaging member and towards the center of the wave-dissipating block, while maintaining the holding state of the engaging member, so that the engaging mechanism holds one of the legs. The steps include: raising and moving the wave-dissipating block gripping device using the aforementioned work machine, thereby moving the wave-dissipating block; A method for moving wave-dissipating blocks, characterized by including the following:

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