Wave-breaking block grasping device and method for moving wave-breaking blocks

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

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

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

[0002] Conventionally, concrete wave-dissipating blocks, which have four legs extending from the center of gravity of a regular tetrahedron in the direction of each vertex, i.e., extending in different directions from each other, have a unique shape that allows them to achieve strong bonding strength when placed together.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-stabilizing blocks or wave-breaking blocks, and are used for revetments and water conservation purposes.

[0003] For this reason, various gripping devices have been proposed in the past for gripping wave-dissipating blocks. For example, the gripping device of Patent Document 1 is configured to grip the joints of the legs extending in three directions in a plan view by closing three holding members, in order to solve the problem of dangerous manual slinging work using wires. In other words, the device of Patent Document 1 is configured to grip the vicinity of the center of gravity of the wave-dissipating block, making it possible to stably grip and move the wave-dissipating block.

[0004] Japanese Patent Application Laid-Open No. 2019-85179

[0005] However, in the gripping device disclosed in Patent Document 1, the three holding members are each rotated by a separate hydraulic cylinder, and each of the three holding members is longer than the wave-dissipating blocks. As a result, the gripping device disclosed in Patent Document 1 is large and heavy, making it difficult to move and potentially ineffective, particularly in the event of a disaster.

[0006] Therefore, the present invention has been made to solve the above problems, and its objective is to provide a wave-dissipating block gripping device and a wave-dissipating block moving method that can grip and move wave-dissipating blocks, is safe, does not require dangerous manual wire slinging work, and is smaller and lighter.

[0007] The present invention provides a wave-dissipating block gripping device that is supported by a work machine and is capable of gripping a wave-dissipating block that has a plurality of legs extending in different directions, the device comprising a pair of holding members and a base member that pivotally supports the pair of holding members, an engagement mechanism that enables the pair of holding members to hold one of the plurality of legs, and an engagement member that has a ring member whose inner diameter is equal to or greater than the minimum outer diameter of the leg, is held on the base member at a predetermined angle, and holds another of the plurality of legs that faces upward, the pair of holding members being able to support the wave-dissipating block without being plastically deformed by the weight of the wave-dissipating block, and when supporting the wave-dissipating block, the tip ends of the pair of holding members are positioned below the engagement members, thereby solving the above problem.

[0008] In this invention, an engaging member having a ring member whose inner diameter is equal to or greater than the minimum outer diameter of the leg holds another leg of the wave-dissipating block facing upward. In other words, since it is the ring member that holds the other leg, 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 members. In other words, since the pair of holding members support most of the weight of the wave-dissipating block, the engaging members do not need to support the weight of the wave-dissipating block, and the engaging members can be configured to be small and simple.

[0009] According to the present invention, it is possible to provide a wave-dissipating block gripping device and a wave-dissipating block moving method that can grip and move wave-dissipating blocks, and is safe and does not require dangerous manual wire slinging work, while being smaller and lighter.

[0010] Schematic diagram showing a work machine, a wave-dissipating block gripping device, and wave-dissipating blocks according to a first embodiment of the present invention. Diagrams showing the wave-dissipating block gripping device of Figure 1 (perspective view (A), top view (B), side view (C), front view (D)). Diagrams showing the open state of a pair of holding members of the wave-dissipating block gripping device of Figure 2 (side view (A), front view (B)). Diagrams showing the procedure for gripping and moving a wave-dissipating block using the wave-dissipating block gripping device of Figure 2 (diagram of lowering the wave-dissipating block gripping device relative to the wave-dissipating block (A), diagram of the open state of a pair of holding members of the wave-dissipating block gripping device (B), diagram of the wave-dissipating block gripping device). (C) A diagram showing the engaging member holding the other leg, (D) A diagram showing a pair of holding members of the wave-dissipating block holding device in a closed state, (E) A diagram showing a pair of holding members of the wave-dissipating block holding device holding one leg, (F) A diagram showing a wave-dissipating block being suspended by the wave-dissipating block holding device. A flowchart explaining the procedure shown in Figure 4. Figures showing the procedure for placing a wave-dissipating block in a predetermined position using the wave-dissipating block holding device of Figure 2 ((A) A diagram showing the wave-dissipating block being lowered while holding the wave-dissipating block, and (B) A diagram showing the wave-dissipating block being placed in a predetermined position by the wave-dissipating block holding device). B), a diagram of opening a pair of holding members and releasing one leg (C), a diagram of releasing the wave-dissipating block and raising the wave-dissipating block gripping device (D)) a flowchart explaining the procedure shown in Figure 6; 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 (a diagram of the wave-dissipating block before being gripped by the work machine (A), a diagram of the wave-dissipating block in a state where it is gripped by the work machine (B)); a diagram showing the wave-dissipating block gripping device of Figure 8 (a perspective view (A), a side view (B), a front view (C), a front perspective view without an engaging member (D)); a diagram of the wave-dissipating block of Figure 9 10 is a cross-sectional view illustrating a change in the distance between the tip ends of a pair of holding members of a wave-dissipating block holding device (FIG. 10A shows a case where the distance between the tip ends of the pair of holding members is wide, and FIG. 10B shows a case where the distance between the tip ends of the pair of holding members is narrow); 10 is a diagram showing the procedure for holding a wave-dissipating block using the wave-dissipating block holding device of FIG. 9 (FIG. 10A shows the wave-dissipating block holding device being lowered relative to the wave-dissipating block, FIG. 10B shows the engagement member of the wave-dissipating block holding device holding another leg of the wave-dissipating block, and FIG. 10C shows the tip ends of the pair of holding members of the wave-dissipating block holding device being moved toward the center of the wave-dissipating block;a diagram showing a wave-dissipating block being gripped by the wave-dissipating block gripping device (D); a flowchart explaining the procedure shown in Figure 11; a diagram showing the procedure for placing a wave-dissipating block in a predetermined position using the wave-dissipating block gripping device of Figure 9 (a diagram showing the wave-dissipating block being lowered while gripping the wave-dissipating block (A); a diagram showing the wave-dissipating block being placed in a predetermined position by the wave-dissipating block gripping device (B); a diagram showing the wave-dissipating block being rotated and the holding state of one leg relative to the pair of holding members being released (C); a diagram showing the wave-dissipating block being released and the wave-dissipating block gripping device being raised (D)); a flowchart explaining the procedure shown in Figure 13; a diagram showing a state in which a wave-dissipating block is gripped in a manner different from that of Figure 8(B) in the working machine according to this embodiment;

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

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

[0013] As shown in FIG. 1 , the work machine 100 is, for example, a crane vehicle with outriggers (which may be an excavator or a crane mechanism mounted on a barge), and is equipped with a rotatable main body 101 and an arm 102 with an adjustable inclination angle. The arm 102 is, for example, an extendable telescopic boom (or a lattice boom). A main wheel 104 is provided at the tip of the arm 102, and a main wire Mw that suspends the wave-dissipating block gripping device 110 is engaged therewith (therefore, the wave-dissipating block gripping device 110 is capable of corresponding rotation about the main wire Mw). Furthermore, although not shown, a secondary wheel is provided at the tip of the arm 102. A secondary wire (string-like member) Sw that controls 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 feed length of the secondary wire Sw increases (the tension of the secondary wire Sw decreases), causing the pair of holding members 122 to descend and enter a closed state. Furthermore, when the feed length of the secondary wire Sw decreases (the tension of the secondary wire Sw increases), the pair of holding members 122 ascend and enter an open state. If the feed length of the main wire Mw is shortened, the wave-dissipating block holding device 110 itself ascends. Conversely, if the feed length of the main wire Mw is lengthened, the wave-dissipating block holding device 110 itself descends.

[0014] As shown in Figure 1, a wave-dissipating block CB is a concrete irregular-shaped block with four legs LP extending from the center of gravity of a regular tetrahedron toward each vertex, i.e., extending in different directions. As shown in Figure 1, the cross-sectional diameter of each leg LP of a wave-dissipating block CB decreases toward the end of the leg LP, with the cross-sectional diameter being longest at the point where the four legs LP are connected. Generally, wave-dissipating blocks CB do not often use reinforcing bars, partly to prevent deterioration due to corrosion. For this reason, wave-dissipating blocks CB may be severely damaged by localized stress. Given their size, they must be handled, transported, and installed carefully and accurately without applying excessive stress. Universally used wave-dissipating blocks CB are available in a total of 18 sizes, ranging in weight from 0.5 tons (height 90 cm) to 80 tons (height 5 m), and the cross-sections of the legs LP are approximately circular. In this embodiment, the wave-dissipating blocks CB are assumed to be mainly usable in rivers, and are mainly 10 tons or less (for example, a weight of 6.3 tons and a height of approximately 2 m). The wave-dissipating blocks CB are basically manufactured in the required number and size using formwork near the construction site.

[0015] As shown in FIG. 1 , the wave-dissipating block gripping device 110 is supported by the work machine 100 and is capable of gripping wave-dissipating blocks CB. As shown in FIGS. 2(A) to 2(D) , the wave-dissipating block gripping device 110 includes an attachment member 112, an engagement mechanism 114, and an engagement member 126. The engagement mechanism 114 includes a link mechanism 116, a base member 118, and a pair of holding members 122, each of which is capable of holding one of the four legs LP. The base member 118 supports the pair of holding members 122. The engagement member 126 has a ring member whose inner diameter is equal to or greater than the minimum outer diameter of the leg LP, and is held by the base member 118 at a predetermined angle α (e.g., α = approximately 70 degrees). The engagement member 126 holds the other of the four legs LP, which faces upward. The pair of holding members 122 are capable of supporting the wave-dissipating blocks CB without being plastically deformed by the weight of the wave-dissipating blocks CB. Furthermore, when supporting the wave-dissipating blocks CB, the tip portions 122A of the pair of holding members 122 are positioned below the engaging members 126. In this embodiment, the wave-dissipating block holding device 110 is configured to weigh less than 4 tons and have a height of less than 2 m (when the pair of holding members 122 are in the open state) for a wave-dissipating block CB that weighs, for example, 6.3 tons and is approximately 2 m high (thus, for a wave-dissipating block CB that weighs, for example, 16 tons and is approximately 3 m high, the wave-dissipating block holding device 110 can be configured to weigh less than 10 tons and have a height of less than 3 m at most). It is desirable to use a different wave-dissipating block gripping device 110 for each size of wave-dissipating block CB, but one size of wave-dissipating block gripping device 110 is capable of gripping three or more adjacent sizes of wave-dissipating block CB (for example, a wave-dissipating block gripping device 110 designed for a wave-dissipating block CB weighing 6.3 tons (height 2 m) is capable of moving five different sizes of wave-dissipating block CB: weighing 3.2 tons (height 1.6 m), weighing 4 tons (height 1.8 m), weighing 5 tons (height 1.9 m), weighing 6 tons (height 2 m), and weighing 8 tons (height 2.3 m)).

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

[0017] 1 and 2(A) to 2(D), the mounting member 112 is a plate-like 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. As shown in Fig. 2(A), for example, the mounting member 112 includes a mounting main body 112A formed by connecting two plate-like members side by side in the Y direction, and a mounting hole 112B in which a pin Pn1 is disposed is provided at the upper end of the mounting main body 112A. A hook Fk1 attached to the main wire Mw is slidably connected to the pin Pn1. 2A, a recess 112C is provided below the mounting body 112A at a position shifted from directly below the mounting hole 112B, and a pin Pn2 is disposed in the recess 112C to pivotally support the link mechanism 116 in a direction (Y direction in FIG. 2A) perpendicular to the direction in which the mounting body 112A extends (X direction in FIG. 2A). As shown in FIGS. 2B and 2C, the mounting member 112 may be provided with an arc-shaped limiting member 124 (shown by a dashed line) at a side end 112D opposite the pin Pn1 with respect to the link mechanism 116. In this case, the secondary wire Sw is inserted inside the limiting member 124.

[0018] As shown in FIG. 2A , the link mechanism 116 is connected to a pair of holding members 122 by connecting members 120. Specifically, the link mechanism 116 includes three rectangular first link members 116A and three rectangular second link members 116B. The upper ends of the three first link members 116A are rotatably supported by pins Pn2 on the mounting member 112. The lower end of one of the first link members 116A is rotatably connected to the upper ends of two second link members 116B by pin Pn3, while being sandwiched between them. Meanwhile, the lower ends of the remaining two first link members 116A are rotatably connected to the upper end of one second link member 116B by pin Pn4, while being sandwiched between them. Furthermore, the point where one second link member 116B and two second link members 116B intersect (the center of the second link member 116B) is pivotally supported by the base member 118 via a pin Pn5. The lower ends of the second link members 116B are each integrated with a holding member 122 by a connecting member 120. For this reason, when the base member 118 is brought closer to the mounting member 112, the pair of holding members 122 are in an open state. Conversely, when the base member 118 is moved away from the mounting member 112, the pair of holding members 122 are in a closed state. 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 the link mechanism 116 connected to the pair of holding members 122. The pair of holding members 122 can be opened and closed by changing the distance between the base member 118 and the mounting member 112 .

[0019] As shown in Figures 2A, 2C, and 2D, the base member 118 has a frame-shaped base main body 118A with an opening penetrating in the Y direction. A pin Pn5 for supporting the second link member 116B is located approximately in the center of the base main body 118A. A support portion 118B is attached to the front of the base main body 118A to attach an engaging member 126 at a predetermined angle α (≈70 degrees). Specifically, the engaging member 126 is replaceably attached to a protrusion 118C provided on the support portion 118B with a bolt Bt. The protrusion 118C has a through-hole through which the bolt Bt can be attached.

[0020] As shown in FIG. 2A, the pair of holding members 122 are pivotally supported on the base member 118 by the second link member 116B, and can hold one leg LP by bringing their tip ends 122A closer together. The pair of holding members 122 have contact portions 122C that contact the leg LP, which are plate-shaped members with curved shapes that mimic the shape of the leg LP, so that the opposing tip ends 122A are close together. That is, as shown in FIG. 3B, the distance L1 is greater than the distance L, so that even if the extreme ends of the tip ends 122A come into contact, the main body portions 122B do not come into contact with each other. In this embodiment, it is desirable that the curvature of the tip ends 122A decreases as they extend further (note that the minimum curvature may be the curvature of the leg LP held by the pair of holding members 122). The main body 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, which directly contacts the leg 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 LP is held by a pair of holding members 122, there are few areas that come into contact with the leg LP at acute angles. This avoids localized stress on the wave-dissipating block CB, preventing damage to the leg LP. The engagement mechanism 114, including the pair of holding members 122, is made of steel primarily composed of iron, which allows it to support 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 equal to or greater than the minimum outer diameter of the leg portion LP. Specifically, the engaging member 126 includes an engaging end portion 126A and an engaging main body portion 126B. The engaging end portion 126A is a terminal with a ring formed thereon that can be easily fixed to the protrusion 118C with a bolt Bt. The engaging main body portion 126B is a steel wire rope (e.g., a shape that forms an arc of at least two-thirds of a circle) curved into a ring shape and having a diameter of 1 cm or more (the diameter can be adjusted appropriately depending on the weight of the wave-dissipating block CB), forming a ring member. Therefore, the engaging member 126 is less rigid than the pair of holding members 122 and is lighter than the pair of holding members 122. At least a portion of the outer periphery of the engaging main body portion 126B may be covered with a cushioning material such as rubber. The presence of this cushioning material prevents the wire from directly contacting the leg portion LP, further preventing damage to the wave-dissipating block CB. In this embodiment, a plurality of engaging main bodies 126B (steel wire ropes) of different lengths are prepared as the engaging members 126, and an engaging main body 126B of a length corresponding to the size of the wave-dissipating block CB to be grasped is selected, and the engaging end 126A is fixed to the convex portion 118C of the support portion 118B. This makes it possible to quickly prepare an engaging member 126 that matches the wave-dissipating block CB to be grasped. Note that the convex portion 118C is provided on the support portion 118B, and the engaging member 126 is held at a predetermined angle α by the base member 118. However, this is not limiting, and the length of the steel wire rope that constitutes the engaging main body may be adjustable when it is fixed to the support portion (of course, the engaging member does not have to be a steel wire rope).

[0022] A connecting member 128 is connected to the linking member 120. The connecting member 128 comprises, for example, a bifurcated steel wire rope (which may be formed from a combination of plate-shaped members), with two lower ends attached to the linking member 120 and one upper end provided with a handle. A hook Fk2 attached to the secondary wire Sw is attached to the handle. Therefore, as can be understood from a comparison of Figures 2(C) and 3(A) (or Figures 2(D) and 3(B)), the distance of the base member 118 from the mounting member 112 can be changed by changing the feed length of the secondary wire Sw connected to the connecting member 128, which extends from the tip of the arm body 102 of the work machine 100 and is connected to the pair of holding members 122.

[0023] The plane (rotation plane) PL on which the pair of holding members 122 rotate is also the plane on which the link mechanism 116 extends and retracts, and the center of gravity of the wave-dissipating block holding device 110 is located approximately on the rotation plane PL. However, the position of the pin Pn1 supported by the main wire Mw on the mounting member 112 is located away from the rotation plane PL. As shown in FIG. 3A, the position of the pin Pn1 is away from the rotation plane PL. Therefore, when the weight of the wave-dissipating block holding device 110 is supported almost entirely by the main wire Mw, the rotation plane PL is inclined relative to the vertical direction (Z direction), as shown in FIG. 4A. In other words, when the distance between the mounting member 112 and the base member 118 is at its maximum, the mounting member 112 is suspended so that the rotation plane PL on which the pair of holding members 122 rotate intersects the vertical direction (Z direction).

[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 described with reference to FIGS. 4(A) to 4(F) and FIG. 5.

[0025] First, an engaging member 126 that is compatible with the identified wave-dissipating block CB is selected and attached to the support portion 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 (FIG. 4(A), FIG. 5 step S2). At this time, the auxiliary wire Sw is fed out at the same feed amount as the main wire Mw, with almost no tension applied to the auxiliary wire Sw. Note that the rotation 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 auxiliary wire Sw relative to the main wire Mw is shortened (step S4 in Fig. 5 ). As a result, the base member 118 approaches the mounting member 112, the rotation plane PL becomes closer to the vertical direction, the distance L between the pair of holding members 122 increases, and the pair of holding members 122 enters an open state (step S6 in Fig. 5 , Fig. 4(B)).

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

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

[0030] Next, the work machine 100 uses the main wire Mw to pull up the wave-dissipating block gripping device 110 while leaving the secondary wire Sw in a released state. Then, because the position of the pin Pn1 supported by the main wire Mw is away from the rotation plane PL, the tip ends 122A of the pair of holding members 122 move further toward the center of the wave-dissipating block CB, further increasing the deviation between the rotation plane PL and the vertical direction. Then, as the weight of the wave-dissipating block CB is applied to the tip ends 122A of the pair of holding members 122, the distance L1 between the pair of holding members 122 is narrowed to a minimum, and the pair of holding members 122 of the engagement mechanism 114 firmly hold one leg LP ( FIG. 4(E) , FIG. 5 step S16).

[0031] Then, the work machine 100 raises the wave-dissipating block gripping device 110, and moves the wave-dissipating block CB away 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. In this state, the work machine 100 raises the wave-dissipating block gripping device 110 ( FIG. 4(F)) and moves it, thereby moving the wave-dissipating block CB ( FIG. 5 step S18).

[0032] Next, the procedure for placing the wave-dissipating block CB at a predetermined position using the wave-dissipating block gripping device 110 will be described with reference to FIGS. 6(A) to 6(D) and 7.

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

[0034] Next, the wave-dissipating block CB is lowered by the work machine 100 (FIG. 6(A), step S20 in FIG. 7), and the wave-dissipating block CB is placed in a predetermined position (FIG. 6(B), step S22 in FIG. 7).

[0035] Next, tension is applied to the secondary wire Sw to shorten the feed length of the secondary wire Sw and move the base member 118 closer to the mounting member 112. This increases the distance L between the tip ends 122A of the pair of holding members 122 (step S26 in FIG. 7), and one leg LP of the pair of holding members 122 is released ( FIG. 6(C), step S28 in FIG. 7).

[0036] Then, the work machine 100 raises the wave-dissipating block gripping device 110 to release the holding state of the other leg LP, and moves the wave-dissipating block gripping device 110 away from the wave-dissipating block CB (Figure 6 (D), Figure 7 step S30).

[0037] In this way, the present embodiment includes the engagement mechanism 114 and the engagement member 126 that hold the two legs LP in the radial direction. Therefore, the wave-dissipating block gripping device 110 does not require a mechanism large enough to hold one leg LP in its entirety.

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

[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. This reduces the stress applied to the wave-dissipating block CB compared to the prior art (when supported by three members). In other words, it is possible to further prevent damage to the wave-dissipating block CB.

[0040] In this embodiment, the engaging member 126 holds the other leg LP. That is, because the ring member holds the other leg LP, no special power source is required to hold the other leg LP. Furthermore, the pair of holding members 122 can support the wave-dissipating blocks CB without being plastically deformed by the weight of the wave-dissipating blocks CB. At the same time, when supporting the wave-dissipating blocks CB, the tip ends 122A of the pair of holding members 122 are positioned below the engaging members 126. In other words, since the pair of holding members 122 support most of the weight of the wave-dissipating blocks CB, the engaging members 126 do not need to support the weight of the wave-dissipating blocks CB, and the engaging members 126 can be configured to be small and simple.

[0041] Furthermore, in this embodiment, the engaging member 126 is, for example, a steel wire rope, and has a 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 is used to hold another leg LP facing upward, even if the leg LP and the engaging member 126 are slightly misaligned, the engaging member 126 can easily hold the leg LP. 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, can be easily and stably operated by the work machine 100, and can handle the wave-dissipating blocks CB more stably. However, this is not limited to this, and the engaging member may be stronger in rigidity than the pair of holding members or heavier than the pair of holding members.

[0042] In this embodiment, the base member 118 is rotatably supported on the mounting member 112, which is suspended 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 holding members 122 are opened and closed by changing the distance between the base member 118 and the mounting member 112. In other words, the use of the link mechanism 116 allows the pair of holding members 122 to be opened and closed by the descent of the pair of holding members 122. In other words, the weight of the wave-dissipating block CB is applied to the contact portions 122C of the pair of holding members 122, thereby more reliably lowering the pair of holding members 122. This automatically and reliably closes the pair of holding members 122, eliminating the need for a large power source to generate the force required to open and close the pair of holding members 122. This allows the wave-dissipating block gripping device 110 to have a simple configuration and be lighter. At the same time, because a large power source is not required, there is no need for hydraulic pressure to drive the large power source or wiring to supply electricity, providing a high degree of freedom in placement of the wave-dissipating block gripping device 110. Note that this is not limiting, and a configuration that does not use a link mechanism may also be used, or even if a link mechanism is used, it is not necessary to use a method of changing the distance of the base member from the mounting member.

[0043] Furthermore, in this embodiment, the curvature of the tip portions 122A of the pair of holding members 122 becomes smaller as they extend further forward. Therefore, even if the weights of the pair of holding members 122 and the base member 118 are not large, the weight of the wave-dissipating blocks CB is more effectively applied to the tip portions 122A via the contact portions 122C of the pair of holding members 122. In other words, the pair of holding members 122 descend more reliably, the tip portions 122A of the pair of holding members 122 enter a closed state, and the distance between the pair of holding members 122 is reliably minimized. This makes it possible to more reliably hold the wave-dissipating blocks CB. However, this is not limiting, and the curvature of the tip portions of the pair of holding members does not have to become smaller as they extend further forward.

[0044] Furthermore, in this embodiment, when the distance between the base member 118 and the mounting member 112 is greatest, the mounting member 112 is suspended so that the rotation plane PL on which the pair of holding members 122 rotates 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 holding device 110 is supported almost entirely by the main wire Mw. At this time, the rotation plane PL tilts, and the tip ends 122A of the pair of holding members 122 move toward the pin Pn1, i.e., below the engaging member 126. In other words, since the tip ends 122A of the pair of holding members 122 move toward the center of the wave-dissipating block CB, the tip ends 122A always support the portion of the wave-dissipating block CB close to the center of gravity, enabling the wave-dissipating block CB to be held more safely and reliably. However, this is not a limitation, and the mounting member does not have to be suspended so that the rotation plane PL intersects the vertical direction.

[0045] Furthermore, in this embodiment, the distance of the base member 118 from the mounting member 112 is changed by changing the feed length of the auxiliary wire Sw 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 the pair of holding members 122. Therefore, no special control device is required to change the distance of the base member 118 from the mounting member 112. In other words, the preparation and operation of the wave-dissipating block gripping device 110 can be performed more easily than in the past. At the same time, because the distance of the base member 118 from the mounting member 112 is changed by the auxiliary wire Sw, which expands and contracts in the same direction as the main wire Mw, a high degree of freedom in placement of the wave-dissipating block gripping device 110 can be ensured. Furthermore, the tension of the auxiliary wire Sw directly raises and lowers the pair of holding members 122. Therefore, the amount of expansion and contraction of the auxiliary wire Sw is greater than when the auxiliary wire Sw is directly connected to the base member 118, allowing the pair of holding members 122 to be opened and closed quickly and accurately. The present invention is not limited to this, and the auxiliary wire Sw may be directly connected to the base member. Since the pair of holding members are automatically closed by their own weight and the weight of the wave-dissipating blocks CB, it is also possible to provide electromagnetic magnets on the mounting member and the base member, and to control the attachment and detachment of the mounting member and the base member by wireless remote control.

[0046] Furthermore, in this embodiment, the mounting member 112 may be provided with an arc-shaped limiting member 124 at the side end 112D, and the secondary wire Sw may be inserted inside the limiting member 124. In this case, the feed direction of the secondary wire Sw is always substantially parallel to the rotation plane PL and coincides with the direction of movement of the base member 118 relative to the mounting member 112. Therefore, regardless of the state of the wave-dissipating block CB or the posture 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 limiting, and the limiting member may not be necessary. This is especially because the posture 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 provide a wave-dissipating block gripping device 110 and a wave-dissipating block moving method that can grip and move wave-dissipating blocks CB safely without requiring dangerous manual slinging work with wires. In other words, the wave-dissipating block gripping device 110 can be manufactured at lower cost than conventional technology, and can be easily gripped, transported, installed, and used. Therefore, the wave-dissipating block gripping device 110 can quickly and reliably move wave-dissipating blocks CB, for example, in emergency measures when there is a risk of a levee 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. In other words, it goes without saying that improvements and design changes are possible within the scope of the present invention.

[0049] In the first embodiment, the wave-dissipating block gripping device 110 is suspended from the work machine 100 via the main wire Mw, but the present invention is not limited to this. For example, it may be as shown in the second embodiment shown in Figures 8 to 15. In the second embodiment, the wave-dissipating block gripping device 210 is attached directly 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] 8(A) and 8(B), the work machine 200 is a backhoe with a bendable arm body 202. The arm body 202 is supported on the main body 201 so that it can swing and rotate. A wave-dissipating block gripping device 210 is attached to and supported on a support shaft 202A and a link shaft 202B provided at the tip of the arm body 202, in the same way as a normal work attachment (for example, a cutter or grapple). In other words, the wave-dissipating block gripping device 210 is supported at the tip of the arm body 202 of the work machine 200 so that it can swing.

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

[0052] As shown in Figures 8(A) and (B), the base member 218 is connected to the support shaft 202A and link shaft 202B of the arm body 202. The base member 218 is a member that changes the attitude 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 swingably supported at the tip of the arm body 202 of the work machine 200. Specifically, the base member 218 comprises a base main body portion 218A, a support portion 218B, and a base mounting portion 218C. The base main body portion 218A is a frame-shaped member with an opening that penetrates in the Y direction of Figure 9(A). Through holes 218AB and 218AC are provided at the centers of the upper surface plate 218AA and the lower surface of the base main body portion 218A, respectively, through which a rod portion 234B of a displacement member 234 (described later) is rotatably supported. In addition, protrusions are provided on both sides of the lower end of the front and back surfaces of the base main body 218A to rotatably support a pair of holding members 222 via pins Pn6. As shown in FIG. 9B , support portions 218B are provided on the front and back surfaces of the base main body 218A, and attach engaging members 226 at a predetermined angle α (≈70 degrees). (The support portions 218B correspond to the support portions 118B and protrusions 118C of the first embodiment.) The engaging members 226 are replaceably attached to the support portions 218B with bolts Bt. The base mounting portions 218C are two plate-like members integrally attached to the top plate 218AA of the base main body 218A. The two base mounting portions 218C are more firmly integrated with the top plate 218AA by two reinforcing portions 218CA. 9(B), the base mounting portion 218C has a symmetrical shape with respect to the rotation plane PL and is provided with a support hole 218D that can be attached to either the support shaft 202A or the link shaft 202B. The two support holes 218D are also provided at symmetrical positions. A rotation device (which may be configured to enable rotation depending on the weight balance, or may be provided with a drive unit that controls the rotation angle) may be provided in the portion of the top plate 218AA (between the base main body portion 218A and the base mounting portion 218C).

[0053] As shown in FIG. 9A , the pair of holding members 222 are rotatably supported on the base member 218 by pins Pn6 at protrusions provided on the front and back surfaces of the base main body 218A. The pair of holding members 222 are capable of holding one leg LP by having a pre-adjusted distance between their respective tip ends 222A. The pair of holding members 222 have contact portions 222C that contact the leg LP, which are plate-shaped members with curved shapes that conform to the shape of the leg LP, so that the opposing tip ends 222A are close to each other. That is, as shown in FIGS. 10A and 10B , the distance L1 is greater than the distance L. In this embodiment, the curvature is approximately constant from the main body 222B to the tip end 222A, excluding the most distal end. The main body 222B of the holding member 222 is supported by pins Pn6. The rear end 222D, which is integral with the main body 222B, has an arc-shaped cross section (in this embodiment, an arc-shaped cross section that is approximately 2 / 3 or more of a circle). The contact portion 222C, which directly contacts the leg LP, has the same configuration as in the first embodiment, and therefore its description will be omitted. Similarly to the first embodiment, at least one pair of holding members 222 and the base member 218 are made of steel primarily composed of iron, and are capable of supporting the wave-dissipating blocks CB without plastic deformation due to the weight of the wave-dissipating blocks CB.

[0054] 9(D), 10(A), and 10(B), the adjustment mechanism 230 is engaged with the rear end portions 222D of the pair of holding members 222 inside the base member 218. The adjustment mechanism 230 is capable of adjusting the distance between the tip ends 222A to be equal to or greater than the minimum outer diameter of the leg portions LP and less than the maximum outer diameter. Specifically, the adjustment mechanism 230 includes a covering member 232 and a displacement member 234.

[0055] 9(D), 10(A), and 10(B), the covering member 232 is a member that slidably covers the rear end portion 222D, which has an arc-shaped cross section, and includes a T-shaped covering upper portion 232A and a covering lower portion 232B. The covering upper portion 232A and the covering lower portion 232B are arranged to sandwich the rear end portion 222D from opposite sides. Threaded holes 232AA and 232BA are provided in the directly opposing central portions of the covering upper portion 232A and the covering lower portion 232B, respectively, to thread onto threads provided on the surface of the rod portion 234B of the displacement member 234.

[0056] As shown in Figures 10A and 10B, 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 up and down inside the base main body 218A, i.e., in the Z direction in Figures 10A and 10B. The displacement member 234 includes 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 main body 218A while being rotatably supported by the through-holes 218AB and 218AC of the base main body 218A. Ends 234A and 234C can be rotated from the outside using a tool (e.g., a spanner or wrench). Rod 234B is cylindrical and threaded, and is threadedly engaged with threaded holes 232AA and 232BA of covering member 232. Therefore, by rotating end 234A or end 234C, rod 234B rotates, covering member 232 moves up and down, and rear end 222D gripped by covering member 232 moves up and down. This causes pin Pn6 to serve as a fulcrum, opening and closing the pair of holding members 222 (in FIG. 10A , covering member 232 moves down, bringing the pair of holding members 222 into an open state; in FIG. 10B , covering member 232 moves up, bringing the pair of holding members 222 into a closed state). 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 open is determined in advance.

[0057] 9A to 9C, the engaging member 226 has a ring shape with an inner diameter equal to or larger than the minimum outer diameter of the leg portion LP. The engaging member 226 also has a lower rigidity than the pair of holding members 222 and is lighter than the pair of holding 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 description thereof will be 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 described with reference to FIGS. 11(A) to 11(D) and 12.

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

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

[0061] The wave-dissipating block holding device 210 is further lowered, and the other leg LP facing upward is held by the engaging member 226 (step S36 in FIG. 12). Then, the tip 222A is moved to the end of one leg LP (FIG. 11(B), step S38 in FIG. 12), and the tip 222A of the pair of holding members 222 passes 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 members 226, to move the tip ends 222A to a position of the leg LP that is greater than the distance L between the tip ends 222A of the pair of holding members 222, i.e., toward the center of the wave-dissipating block CB (step S40 in FIG. 12 ). In other words, the tip ends 222A of the pair of holding members 222 are positioned below the engaging members 226, and one leg LP is held by the pair of holding members 222 ( FIG. 11(C), step S42 in FIG. 12 ). This allows one leg LP to be held by the pair of holding members 222, and the other leg LP will not come off the engaging members 226.

[0063] The work machine 200 then raises (FIG. 11(D)) and moves the wave-dissipating block gripping device 210, thereby moving the wave-dissipating block CB (FIG. 12, step S44). At this time, the work machine 200 can grip the wave-dissipating block CB, for example, in the form shown in FIG. 8(B), that is, using one of the two engaging members 226, which is on the main body side of the work machine 200, and the pair of holding members 222.

[0064] Next, the procedure for placing the wave-dissipating block CB at a predetermined position using the wave-dissipating block gripping device 210 in this embodiment will be described with reference to FIGS. 13(A) to 13(D) and 14.

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

[0066] Next, the work machine 200 lowers the wave-dissipating block gripping device 210 (FIG. 13(A), step S50 in FIG. 14). Then, the wave-dissipating block CB is placed in a predetermined position (FIG. 13(B), step S52 in FIG. 14).

[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 bases of the held legs LP toward the ends of the legs LP (step S54 in FIG. 14). Then, when the tip portions 222A are able to pass over the legs LP, the rotation of the wave-dissipating block gripping device 210 is stopped, and the holding state of one leg LP by the pair of holding members 222 is released (FIG. 13(C), step S56 in FIG. 14).

[0068] Then, the work machine 200 raises the wave-dissipating block holding device 210 to release the holding state of the other leg LP, and moves the wave-dissipating block holding device 210 away from the wave-dissipating block CB (Figure 13 (D), Figure 14 step S58).

[0069] As described above, in this embodiment, the base member 218 is swingably 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 adjusts the distance L between the tip ends 222A to be equal to or greater than the minimum outer diameter of the leg portion LP and less than the maximum outer diameter. In other words, in this embodiment, a wave-dissipating block CB can be grasped by a work machine 200 such as a backhoe, and then transported and installed while controlling its posture. At the same time, the wave-dissipating block CB can be grasped and transported simply by pre-adjusting the distance L between the tip ends 222A of the pair of holding members 222 to match the wave-dissipating block CB to be 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. This allows the wave-dissipating block gripping device 210 to be made smaller and lighter (for example, if a wave-dissipating block CB weighs 6 tons, the wave-dissipating block gripping device 110 of the first embodiment can reduce the weight to about 2 tons, while the wave-dissipating block gripping device 210 of this embodiment can further reduce the weight by about 0.5 tons). Therefore, in this embodiment, when the work machine 200 is a backhoe weighing about 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 weighing about 10 tons, which are mainly used in rivers. In other words, wave-dissipating blocks CB that cannot be placed in a sufficiently targeted and predetermined position using a crane truck or a barge with a crane can be placed more accurately and quickly. At the same time, it is possible to quickly move and stack wave-dissipating blocks CB close to the location in an emergency, such as during heavy rain when the risk of a levee breach is high. However, the engagement mechanism is not limited to this and may have a pair of holding members and a base member that supports the pair of holding members, and the pair of holding members may hold one leg LP of the multiple legs.

[0070] Furthermore, in this embodiment, the adjustment mechanism 230 includes a covering member 232 and a displacement member 234. That is, because the adjustment mechanism 230 includes only two members, the wave-dissipating block gripping device 210 can have a simpler configuration and can promote cost reduction. At the same time, the covering member 232 adjusts and determines the distance L between the tip ends 222A of the pair of holding members 222 by displacing 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 of the distance L changing significantly. In other words, even if, for example, while holding a wave-dissipating block CB at a work site, the side of one of the pair of holding members 222 hits another wave-dissipating block CB violently in the opening and closing direction of the pair of holding members 222, the gripped wave-dissipating block CB can continue to be gripped stably. However, this is not limited to this, and the adjustment mechanism does not have to have only two members, and the adjustment mechanism does not have to adjust the distance L between the pair of holding members by displacement in a direction perpendicular to the direction in which the pair of holding members open and close.

[0071] Furthermore, in this embodiment, the engaging members 226 are provided on the front and back surfaces 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 need to consider 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. Furthermore, the work machine 200 can grip, transport, and install the wave-dissipating blocks CB not only in the configuration shown in FIG. 8(B) but also in the configuration shown in FIG. 15. In other words, when transporting and installing the wave-dissipating blocks CB using the work machine 200, if the wave-dissipating blocks CB are appropriately small, they can be transported and installed in the configuration shown in FIG. 8(B). However, even if the configuration shown in FIG. 8(B) is intended for use, there are cases in which the wave-dissipating blocks CB are large and collide with the arm body 202. In this case, it is possible to transport and install larger wave-dissipating blocks CB 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. In other words, by using the wave-dissipating block gripping device 210 of this embodiment, it is possible to freely handle wave-dissipating blocks CB of different sizes. However, this is not limiting, and the wave-dissipating block gripping device may also be configured to have only one engaging member.

[0072] In the above embodiment, the wave-dissipating block CB is configured to have four legs LP (each having a circular radial cross section that tapers toward the tip) extending from the center of gravity of a regular tetrahedron, but is not limited to this. For example, the wave-dissipating block CB may have a configuration including a plurality of (two or more) legs LP extending in different directions, and the radial cross section of the legs LP may not be a circle but may be an ellipse, a polygon, or a combination thereof.

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

[0074] 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.

[0075] DESCRIPTION OF SYMBOLS 100, 200...Work machine 101, 201...Main body 102, 202...Arm body 104...Main wheel 110, 210...Wave-dissipating block gripping device 112...Mounting member 112A...Mounting main body 112B, 212A...Mounting hole 112C...Recess 112D...Side end 114, 214...Engagement mechanism 116...Link mechanism 116A...First link member 116B...Second link member 118, 218...Base member 118A, 218A...Base main body 118B, 218B...Support portion 118C...Convex portion 120...Coupling member 122, 222...Holding member 122A, 222A...Tip portion 122B, 222B...Main body 122C, 222C...Contact portion 124...Restricting member 126, 226...Engaging member 126A, 226A...Engaging end portion 126B, 226B...Engaging main body portion 128...Connecting member 202A...Support shaft 202B...Link shaft 218AA...Upper surface plate 218AB, 218AC...Through hole 218C...Base mounting portion 218CA...Reinforcing portion 218D...Support hole 222D...Rear end portion 230...Adjusting mechanism 232...Covering member 232A...Upper covering portion 232AA, 232BA...Threaded hole 232B...Lower covering portion 234...Displacement member 234A, 234C...End portion 234B...Rod portion Bt...Bolt CB...Wave dissipating block GD...Ground Fk1, Fk2...Hook LP...Leg portion Mw...Main wire L, L1...Distance Pn1, Pn2, Pn3, Pn4, Pn5, Pn6...Pin PL...Pivot plane Sw...Sub-wire α...Angle

Claims

1. A wave-dissipating block gripping device that is supported by a work machine and can grip a wave-dissipating block having a plurality of legs extending in different directions, a pair of holding members, the pair of holding members being plate-like members having a curved shape conforming to the legs, with their opposing tip portions being close to each other, and a base member that supports the pair of holding members, the pair of holding members being capable of holding one of the plurality of legs; and an engaging member having an inner diameter equal to or larger than the minimum outer diameter of the legs, the engaging member being held at a predetermined angle by the base member and holding another one of the legs facing upward among the plurality of legs; Equipped with The pair of holding members can support the wave-dissipating block without being plastically deformed by the weight of the wave-dissipating block, and when supporting the wave-dissipating block, the tip portions of the pair of holding members are moved and positioned below the engaging members and toward the center of the wave-dissipating block. A wave-dissipating block holding device characterized by the above.

2. In claim 1, A wave-dissipating block gripping device, characterized in that the engaging member has a 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 swingably supported on a tip end of an arm body of the working machine, The pair of holding members have a substantially constant curvature up to the tip portions of the pair of holding 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 retaining members, and is provided with an adjustment mechanism that enables the distance between the tip ends of the pair of retaining members to be adjusted to be greater than or equal to the minimum outer diameter of the legs and less than the maximum outer diameter.

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

5. In any one of claims 1 to 4, The engaging members are provided on the front and rear 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 on an attachment member suspended from a tip end of an arm body of the working machine via a link mechanism connected to the pair of holding members, The tip portions of the pair of holding members have a curvature that is gradually reduced toward the tip, 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 from the mounting member.

7. In claim 6, A wave-dissipating block holding device characterized in that the mounting member is suspended so that when the distance between the mounting member and the base member is at its maximum, the plane in which the pair of holding members rotates 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 from the mounting member can be changed by changing the feed length of a string-like member connected to a connecting member extending from the tip of the arm body of the work machine and connected to the pair of retaining members.

9. In claim 8, A wave-dissipating block gripping device characterized in that the mounting member has 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 for gripping and moving a wave-dissipating block using a wave-dissipating block gripping device that is supported by a work machine and has a plurality of legs extending in different directions, comprising: The wave-dissipating block gripping device includes a pair of holding members, which are plate-shaped members having a curved shape following the legs and whose opposing tip portions are close to each other, and a base member that supports the pair of holding members. The pair of holding members has an engagement mechanism that allows the pair of holding members to hold one of the multiple legs, and an engagement member that has an inner diameter equal to or greater than the minimum outer diameter of the legs, is held at a predetermined angle by the base member, and holds another one of the multiple legs that faces upward. The step of lowering the wave-dissipating block gripping device from above the wave-dissipating block by the work machine and holding the other upwardly facing leg with the engagement member; A step of moving and locating the tip portions of the pair of holding members below the engaging members and toward the center of the wave dissipating block by the working machine while maintaining the holding state of the engaging members, so that the one leg is held by the engaging mechanism; A step of moving the wave dissipating block by lifting and moving the wave dissipating block gripping device by the work machine; A wave-dissipating block moving method comprising: