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

Abstract

To provide a wave-dissipating block holding device which holds and moves a wave-dissipating block safely without dangerous manual slinging work of a wire, is small and lightweight, and can arrange the wave-dissipating blocks in various postures.SOLUTION: A wave-dissipating block holding device 110 comprises a holding mechanism 120 and an engaging member 126 capable of holding the radial direction of each of two leg portions LP, and a bracket 112 rotatably supported by a work machine 100 and supporting the holding mechanism 120 and the engaging member 126. The holding mechanism 120 comprises a pair of holding members 122 capable of gripping one of the two leg portions LP, and a linear motion mechanism 124 for driving and rotating each of the pair of holding members 122. The engaging member 126 comprises a curved member 128 having an inner diameter of a ring formed by attaching both ends to the bracket 112 that is equal to or larger than the minimum outer diameter of the leg portion LP, and a support member 130 capable of supporting a wave-dissipating block CB.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[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, have a strong bonding force when multiple blocks are stacked due to their unique shape. For this reason, 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 the purpose of revetments and water conservation.

[0003] However, due to the unique shape of this wave-dissipating block, basically, multiple wires must be used when lifting and lowering it with a work machine such as a crane. And, most of the connection and disconnection of the multiple wires wrapped around the bottom of this wave-dissipating block (wire slinging work (base mounting work)) is done manually. Here, this wave-dissipating block is heavy, so the wires used are also heavy, and even connecting and disconnecting the wires manually requires a lot of effort. In addition, the site where this wave-dissipating block is used is in a poor footing situation, and there are many dangers for workers. In particular, when placing multiple wave-dissipating blocks on top of each other, workers need to give instructions from the wave-dissipating block near the lower wave-dissipating block, but the surface of the wave-dissipating block is slippery and the working environment is unstable. As a result, workers are prone to slipping and falling, and many accidents have occurred.

[0004] For this reason, various gripping devices have been proposed in the past. 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 slinging work of wires by hand. That is, in Patent Document 1, the wave-dissipating block is covered from top to bottom by three sides, and the vicinity of the center of gravity is supported by three holding members, so that the wave-dissipating block can be stably gripped and moved. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2019-85179 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, the gripping device shown in Patent Document 1 assumes that one leg faces directly down and directly up, and therefore the gripping device needs to be large enough to embrace one entire leg (for example, for a wave-dissipating block weighing about 16 tons and measuring about 3 m in height, the gripping device weighs about 12 tons and measures about 6 m in height). For this reason, the gripping device in Patent Document 1 itself is large and heavy compared to the wave-dissipating block, and there was a concern that it would be difficult to use easily.

[0007] Therefore, the present invention has been made to solve the above-mentioned problems, and its objective is to provide a wave-dissipating block gripping device that can grip and move wave-dissipating blocks safely without requiring dangerous manual slinging of wires, is small and lightweight, and can position wave-dissipating blocks in a variety of positions. [Means for solving the problem]

[0008] The present invention solves the above problem by providing a wave-dissipating block gripping device that is supported by a work machine and is capable of gripping a wave-dissipating block having a plurality of legs extending in different directions, the device comprising: a holding mechanism and an engaging member capable of holding the radial direction of each of two of the plurality of legs; and a bracket that is rotatably supported by the work machine and supports the holding mechanism and the engaging member. The holding mechanism comprises a pair of holding members that are rotatably supported by the bracket and are capable of gripping one of the two legs when their tips approach each other; and a linear motion mechanism that penetrates the bracket and has ends connected to the upper ends of the pair of holding members, and drives the pair of holding members to rotate. The engaging member comprises a curved member whose both ends are attached to the bracket, forming a ring whose inner diameter is equal to or greater than the minimum outer diameter of the legs, and a support member that is fixed to the curved member, extends toward the tips of the pair of holding members, and is capable of supporting the wave-dissipating block.

[0009] In the present invention, a wave-dissipating block has a plurality of legs extending in different directions, and includes a holding mechanism and an engaging member capable of holding the radial direction of each of two of the legs. That is, the holding mechanism and the engaging member are configured to hold the radial direction of each of the two legs, and therefore a holding mechanism large enough to embrace one leg in its entirety is not required. Furthermore, the engaging member includes a curved member having an inner diameter of a ring formed by attaching both ends to the bracket that is equal to or larger than the minimum outer diameter of the leg, and a supporting member fixed to the curved member, extending toward the tip end of the pair of holding members, and capable of supporting the wave-dissipating block, so that the engaging member can be configured light.

[0010] At the same time, the device is configured to have a linear motion mechanism that penetrates the bracket and connects its ends to the upper ends of the pair of holding members, respectively, to rotate each of the pair of holding members. Therefore, in the wave-dissipating block holding device, the distance from the end of the bracket to the tips of the pair of holding members, i.e., the vertical length of the wave-dissipating block holding device, can be made extremely short, making it possible to further reduce the weight.

[0011] Furthermore, the support member is fixed to the curved member and extends toward the tip end side of the pair of holding members, and is capable of supporting the wave-dissipating block. In other words, when one leg is supported by the pair of holding members, the other leg can be supported by the support member rather than the curved member, so that at least two methods of gripping the wave-dissipating block can be realized, and the wave-dissipating block can be stably gripped and transported in various positions, and the wave-dissipating block can be arranged in various positions. Effect of the Invention

[0012] According to the present invention, it is possible to provide a wave-dissipating block gripping device that can grip and move wave-dissipating blocks safely without requiring dangerous manual slinging of wires, and is small, lightweight, and can position wave-dissipating blocks in a variety of positions. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a schematic diagram showing a work machine, a wave-dissipating block gripping device, and a wave-dissipating block according to a first embodiment of the present invention. [Diagram 2] 2A, 2B, 3A, and 3B are diagrams showing the wave-dissipating block holding device of FIG. 1 (perspective view 1(A), perspective view 2(B), side view (C), and top view (D)). [Diagram 3] A flowchart explaining the procedure for gripping and moving a wave-dissipating block with one of the legs facing almost upward using the wave-dissipating block gripping device of FIG. [Figure 4] A diagram showing the procedure of FIG. 3 ((A) lowering the wave-dissipating block gripping device onto the wave-dissipating block, (B) gripping the wave-dissipating block with the wave-dissipating block gripping device, (C) hanging the wave-dissipating block from the wave-dissipating block gripping device) [Diagram 5] A flowchart explaining the procedure for placing a wave-dissipating block in a predetermined position with one of the legs facing upward using the wave-dissipating block gripping device of FIG. [Figure 6]A diagram showing the procedure of FIG. 5 ((A) lowering the wave-dissipating block gripping device while gripping the wave-dissipating block, (B) placing the wave-dissipating block on the ground by the wave-dissipating block gripping device, (C) releasing the wave-dissipating block and raising the wave-dissipating block gripping device) [Figure 7] A flowchart explaining the procedure for rotating the wave-dissipating block by approximately 90 degrees and moving it to a predetermined position using the wave-dissipating block gripping device of FIG. [Figure 8] A diagram showing the procedure for gripping a wave-dissipating block using the wave-dissipating block gripping device of Figure 7 (Figure (A) showing the wave-dissipating block gripping device being lowered onto the wave-dissipating block, Figure (B) showing the support member being placed under the wave-dissipating block, Figure (C) showing the wave-dissipating block being gripped and suspended by the wave-dissipating block gripping device) [Figure 9] A flowchart for explaining the procedure for placing a wave-dissipating block in a predetermined position with one of the legs of the wave-dissipating block facing downward using the wave-dissipating block gripping device of FIG. [Figure 10] A diagram showing the procedure of FIG. 9 ((A) lowering the wave-dissipating block gripping device while gripping the wave-dissipating block, (B) placing the wave-dissipating block on top of another wave-dissipating block by the wave-dissipating block gripping device, (C) releasing the wave-dissipating block and raising the wave-dissipating block gripping device) [Figure 11] FIG. 5 is 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. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an example of the first embodiment of the present invention will be described in detail with reference to FIGS.

[0015] 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.

[0016] As shown in Fig. 1, the work machine 100 is, for example, a crane vehicle with outriggers (it may be an excavator or a crane mechanism installed on a barge), and is equipped with an arm body 102 whose inclination angle can be changed on a rotatable main body 101. The arm body 102 is, for example, an extendable telescopic boom (it may be a lattice boom). A main wheel 104 is provided at the tip of the arm body 102, and a main wire Mw that suspends the wave-dissipating block holding device 110 is engaged therewith (therefore, the wave-dissipating block holding device 110 is in a state in which it can rotate accordingly around the main wire Mw). Although not shown, a sub-wheel is provided at the tip of the arm body 102, and a sub-wire Sw for changing the attitude of the wave-dissipating block holding device 110 is engaged therewith. In other words, shortening the feed length of the main wire Mw and the auxiliary wire Sw will raise the wave-dissipating block holding device 110, and lengthening the feed length of the main wire Mw and the auxiliary wire Sw will lower the wave-dissipating block holding device 110. A relay wheel 106 that feeds out a hose Hs for driving the wave-dissipating block holding device 110 is rotatably supported on the arm body 102.

[0017] As shown in Figure 1, the wave dissipating block CB is a concrete irregular block with four legs LP extending from the center of gravity of a regular tetrahedron to each vertex, i.e., extending in different directions. In general, wave dissipating block CBs do not often use reinforcing bars, partly from the viewpoint of preventing deterioration due to corrosion. For this reason, wave dissipating block CBs may be severely damaged if localized stress is applied, and coupled with their size, they must be held, transported, and installed carefully and accurately without applying large stress. There are 18 types of wave dissipating block CBs in total, ranging from 0.5 tons (height 90 cm) to 80 tons (height 5 m), and the cross section of the leg LP is almost circular. Wave dissipating block CBs are basically manufactured in the required number and size using formwork near the construction site.

[0018] The wave-dissipating block holding device 110 is symmetrical with respect to the third plane TP, as shown in Fig. 2(D). Specifically, the wave-dissipating block holding device 110 is supported by the work machine 100 by the main wire Mw and the sub-wire Sw, as shown in Fig. 1, and is capable of holding the wave-dissipating block CB. As shown in Figs. 2(A) and (B), the wave-dissipating block holding device 110 includes a bracket 112, a holding mechanism 120, and an engaging member 126. The bracket 112 is rotatably supported by the work machine 100, and supports the holding mechanism 120 and the engaging member 126. The holding mechanism 120 and the engaging member 126 are capable of holding the radial direction of each of two of the four (plural) legs LP of the wave-dissipating block CB. The holding mechanism 120 includes a pair of holding members 122 and a linear motion mechanism 124, and the engaging member 126 includes a curved member 128 and a support member 130. The first plane PP includes the curved member 128, the second plane SP includes the pair of holding members 122, and the third plane TP is perpendicular to the first plane PP and the second plane SP and is equidistant from each of the pair of holding members 122.

[0019] In this embodiment, the wave dissipating block CB is assumed to be used mainly in ports and harbors, but may be used for those that can be used in rivers with a weight of less than 20 tons.

[0020] Next, each component will be described in detail.

[0021] 2(A) to 2(D), the bracket 112 includes a pair of mounting plates 114, a cylindrical connecting portion 116 that connects the pair of mounting plates 114, and a rotation support portion 118 that is integrated below the connecting portion 116 and supported by the pair of mounting plates 114. As shown in FIG. 2(D), the bracket 112 is shaped symmetrically with respect to the third plane TP.

[0022] The pair of mounting plates 114 have the same shape as each other, as shown in Fig. 2(A) and (B). Each of the pair of mounting plates 114 is provided with a main mounting hole 114C supported by a main wire Mw extending from the arm body 102 via a connecting portion KB and a rod SL that rotatably supports the connecting portion KB. At the same time, each of the mounting protrusions 114B integrally provided with the pair of mounting plates 114 is provided with a sub-mounting hole 114BA supported by a sub-wire Sw extending from the arm body 102 via the connecting portion KB and the rod SL (i.e., the bracket 112 can be said to be configured to include a pair of mounting plates 114 that are connected to the work machine 100). The main mounting hole 114C and the sub-mounting hole 114BA are provided on opposite sides of the center of the pair of mounting plates 114 (the position of a through hole 114A described later) at approximately the same distance. For this reason, in this embodiment, when the state is changed from the state in which the main mounting hole 114C is supported by the main wire Mw without applying tension to the sub-wire Sw to the state in which the sub-mounting hole 114BA is supported by the sub-wire Sw without applying tension to the main wire Mw, the pair of mounting plates 114 are configured and balanced to rotate 90 degrees or more around the center of the pair of mounting plates 114. That is, by changing the feed length of the sub-wire Sw relative to the main wire Mw, the direction of the pair of holding members 122 (and the direction of the curved member 128 and the direction of the support member 130) can be changed by 90 degrees or more, that is, the attitude of the wave-dissipating block holding device 110 can be changed within those angle ranges (in other words, the bracket 112 is provided with a change member (i.e., the main mounting hole 114C and the sub-mounting hole 114BA) that changes the positional relationship between the holding mechanism 120 and the engaging member 126 when the bracket 112 is rotatably supported by the work machine 100).

[0023] 2(C), a through hole 114A is provided in the center between the main mounting hole 114C and the sub mounting hole 114BA of the pair of mounting plates 114, and a cylindrical connecting portion 116 is provided to surround the through hole 114A and connect the pair of mounting plates 114. With this configuration, a hollow portion of the bracket 112 is formed, and a linear motion mechanism 124 shown in FIG. 2(D) is disposed in this hollow portion while penetrating the bracket 112 without contacting it.

[0024] The rotation support portion 118 is a pair of plate-like members that are integrated with the pair of mounting plates 114 in a crossed configuration, and is integrated with the connecting portion 116 below the connecting portion 116. The rotation support portion 118 rotatably supports a pair of holding members 122 at ends that extend outward from the side surfaces of the mounting plates 114. In other words, the pair of holding members 122 are supported on the outer sides of the pair of mounting plates 114.

[0025] As shown in Fig. 2(A) to (C), the holding mechanism 120 includes a pair of holding members 122 and a linear motion mechanism 124. The pair of holding members 122 are rotatably supported by the bracket 112, and can grip one of the two legs LP by bringing their tips 122A close to each other, and are shaped symmetrically with respect to the third plane TP. As shown in Fig. 2(A), the holding member 122 has a portion that grips the leg LP as a plate-like member curved in a shape that follows the leg LP. A contact portion 122C that directly contacts the leg LP is chamfered (alternatively, a rod-like member with a substantially circular cross-sectional shape may be provided, and this rod-like member may be made of a cushioning material such as rubber and made replaceable). For this reason, even when the leg LP is gripped by the pair of holding members 122, there are no corners, so localized stress on the wave-dissipating block CB can be avoided, and damage to the leg LP can be prevented. The upper ends 122B of the pair of holding members 122 are each directly connected to an end of one of the linear motion mechanisms 124.

[0026] As described above, the linear motion mechanism 124 shown in FIG. 2(D) penetrates the bracket 112 (through hole 114A) and has its ends connected to the upper ends 122B of the pair of holding members 122, so that it is configured to rotate each of the pair of holding members 122. The linear motion mechanism 124 is a cylinder mechanism composed of, for example, a cylinder chamber and a piston. The cylinder mechanism may be operated by hydraulic pressure from a pump unit (not shown) arranged on the ground GD guided through a hose Hs, or may be operated by water pressure from a pump unit (not shown) arranged on the ground GD guided through a hose Hs. Of course, the linear motion mechanism 124 may be an electric cylinder mechanism and configured to receive power from the hose Hs.

[0027] 2(A) to 2(D), the engaging member 126 includes a curved member 128 and a support member 130, and is symmetrical with respect to the third plane TP. The curved member 128 has both ends attached to the bracket 112, forming a ring whose inner diameter is equal to or larger than the minimum outer diameter of the leg portion LP. The support member 130 is fixed to the curved member 128 and extends toward the tip ends of the pair of holding members 122, and is capable of supporting the wave-dissipating block CB.

[0028] As shown in FIG. 2(C), the ends 128A of the curved member 128 are connected to the mounting plates 114 of the bracket 112 by bolts or the like (i.e., the ends of the engaging members 126 are connected to the pair of mounting plates 114, respectively). Therefore, it is possible to remove the bolts and attach another curved member 128. That is, the bracket 112 is configured to allow the engaging members 126 to be detached and replaced (for this reason, by changing the inner diameter of the ring of the curved member 128 according to the outer diameter of the leg LP of the wave-dissipating block CB to be held, it is possible to hold the leg LP of a wider range of wave-dissipating blocks CB. In other words, when the size or type of the wave-dissipating block CB is different, it is possible to correspond to a wider variety of wave-dissipating blocks CB by replacing it with an appropriate engaging member 126. Furthermore, even if the engaging member 126 is damaged or worn out, it is only necessary to replace the engaging member 126, so that it is possible to achieve high maintainability at low cost. Furthermore, it is also possible to remove the engaging member 126 and hold something other than the wave-dissipating block CB.). In this embodiment, the angle α between the pair of holding members 122 and the curved member 128 shown in FIG. 2C (i.e., the angle α between the second plane SP and the first plane PP) is about 70degrees (preferably 90 degrees or less) (that is, the first plane PP including the curved member 128 intersects with the second plane SP including the pair of holding members 122 at an acute angle). Also, a sliding member or a buffer member such as rubber or a roller RL (see FIG. 2(A)) may be provided on at least a part of the curved member 128. In this case, the presence of the sliding member or the buffer member can prevent the curved member 128 from directly colliding with the leg portion LP, and can prevent damage to the wave-dissipating block CB and wear of the curved member 128.

[0029] As shown in FIG. 2(C), the support member 130 is attached to the part of the curved member 128 farthest from the pair of mounting plates 114, that is, at the center of the curved member 128, perpendicular to the curved member 128 (that is, the first plane PP including the curved member 128 is configured to be perpendicular to the direction of the tip end side of the support member 130). Therefore, the direction of the tip end side of the pair of holding members 122 (Z direction in FIG. 2(C)) and the direction of the tip end side of the support member 130 are configured to intersect. In the support member 130, as shown in FIGS. 2(A) to (C), the part integrated with the curved member 128 is curved following the shape of the curved member 128. In addition, the support member 130 is integrated with the curved member 128 in a form in which the curved member 128 is sandwiched between the reinforcing part 130B attached to the inside of the curved member 128 and the curved member 128. Therefore, even if the entire load of the wave dissipating block CB is applied to the support member 130, the wave dissipating block CB is not dropped or deformed. The wave dissipating block CB is placed on the tip 130A of the support member 130, and as shown in Fig. 2(D), Fig. 4(B), and Fig. 8(B), the center position C of the inner shape of the pair of holding members 122 when the wave dissipating block CB is gripped is on the support member 130 when the pair of holding members 122 is viewed in plan. Therefore, as shown in Fig. 2(C), in order to eliminate to some extent the convex shape caused by the reinforcing part 130B extending to the tip 130A, the buffer part 130C is provided on the support member 130 alongside the reinforcing part 130B (the buffer part 130C may be made of metal or rubber). This makes it possible to prevent the reinforcing part 130B from colliding with the wave dissipating block CB and causing cracks or chips when the wave dissipating block CB is supported by the support member 130. At the same time, the convex reinforcing portion 130B can prevent the posture of the wave-dissipating block CB from becoming unstable.

[0030] 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 Fig. 3 and Figs. 4(A)-(C). Here, the wave-dissipating block CB to be moved is a wave-dissipating block CB placed on flat ground GD, and a case will be described in which the wave-dissipating block CB is placed in its original state at the destination. In other words, the wave-dissipating block gripping device 110 grips the wave-dissipating block CB with one leg LP facing upward, and places the wave-dissipating block with that one leg LP facing upward.

[0031] First, the main wire Mw and the sub-wire Sw are extended from the work machine 100, and the wave-dissipating block holding device 110 is lowered from above the wave-dissipating block CB (step S2 in FIG. 3, FIG. 4(A)).

[0032] Then, if necessary, the position of the arm body 102 and the length of the sub-wire Sw relative to the main wire Mw are adjusted to adjust the position and angle of the engagement member 126, and the curved member 128 is engaged with one of the legs LP facing upward (FIG. 3, step S4). Note that this engaged state refers to a state in which one of the legs LP is disposed inside the ring of the curved member 128 formed by attaching both ends of the engagement member 126 to the bracket 112.

[0033] Then, with the curved member 128 still engaged with that one leg LP, the main wire Mw and the secondary wire Sw are extended and the wave-dissipating block holding device 110 is lowered so that the remaining leg LP is positioned between the pair of retaining members 122 (Figure 3, step S6).

[0034] Next, the linear motion mechanism 124 is operated to grip the remaining leg LP with the pair of holding members 122 (step S8 in FIG. 3, FIG. 4(B)). Then, due to the holding (holding) of the remaining leg LP by the holding mechanism 120, the one leg LP does not come out from the inside of the curved member 128, and the one leg LP is held by the engaging member 126.

[0035] Then, the work machine 100 pulls up the main wire Mw and the sub-wire Sw to raise the wave-dissipating block holding device 110 and move the wave-dissipating block CB (Fig. 3, step S10, Fig. 4(C)). Note that since the wave-dissipating block holding device 110 is lighter than the wave-dissipating block CB, when the wave-dissipating block CB is suspended in the air, the position of the center of gravity changes, causing the wave-dissipating block holding device 110 to rotate to a certain extent (for example, about 20-40 degrees).

[0036] Next, the procedure for placing the grasped wave-dissipating block CB explained using Figure 3 and Figures 4(A) to (C) in a predetermined position will be explained using Figures 5 and 6(A) to (C). Here, as described above, the case where the wave-dissipating block CB is placed on the flat ground GD will be explained.

[0037] First, the wave-dissipating block holding device 110 holding the wave-dissipating block CB is placed in the air above a predetermined position by the work machine 100. Then, the main wire Mw and the sub-wire Sw are extended to lower the wave-dissipating block holding device 110 (Step S20 in FIG. 5, FIG. 6(A)).

[0038] Then, when a part of the wave-dissipating block CB has reached the designated position, the speed at which the main wires Mw and the sub-wires Sw are extended is slowed down to place the wave-dissipating block CB completely in the designated position (step S22 in FIG. 5, FIG. 6(B)).

[0039] Next, the linear motion mechanism 124 is operated to increase the distance between the pair of holding members 122 (Step S24 in FIG. 5), thereby releasing the wave-dissipating blocks CB (Step S26 in FIG. 5).

[0040] Then, the main wire Mw and the sub-wire Sw are pulled up to raise the wave-dissipating block holding device 110, thereby separating the wave-dissipating block holding device 110 from the wave-dissipating block CB (Step S28 in FIG. 5, FIG. 6(C)).

[0041] In other words, when the wave-dissipating block CB is positioned with one leg LP facing upward, the curved member 128 holds that one leg LP, and a pair of holding members 122 hold the other leg LP.

[0042] Next, the procedure for gripping and moving the wave-dissipating block CB when the wave-dissipating block CB is rotated almost 90 degrees and placed using the wave-dissipating block gripping device 110 in this embodiment will be described with reference to Fig. 7 and Fig. 8(A)-(C). That is, the wave-dissipating block gripping device 110 grips the wave-dissipating block CB with one leg LP facing upward, and places the wave-dissipating block with one leg LP facing downward.

[0043] First, the main wire Mw and the auxiliary wire Sw are extended from the work machine 100, and the wave-dissipating block holding device 110 is lowered from above the wave-dissipating block CB (Step S32 in Fig. 7). In this case, however, the wave-dissipating block holding device 110 is mainly supported by the auxiliary wire Sw, and the support member 130 is adjusted to be lower than the pair of holding members 122 (Step S34 in Fig. 7, Fig. 8(A)).

[0044] Next, the position of the arm body 102 and the length of the main wire Mw relative to the sub-wire Sw are adjusted as necessary, and the positions and angles of the pair of holding members 122 are adjusted to engage the pair of holding members 122 with one of the legs LP facing upward (FIG. 7, step S36). Note that this engaged state refers to a state in which one of the legs LP is disposed inside the pair of holding members 122. At this time, the pair of holding members 122 may be closed to some extent, but in this case, there should be a play such that the leg LP does not slip out from inside the pair of holding members 122.

[0045] Then, with the pair of retaining members 122 still engaged with one of the legs LP, the main wire Mw and the secondary wire Sw are extended and the wave-dissipating block holding device 110 is lowered so that the tip 130A of the support member 130 is located under the wave-dissipating block CB.

[0046] Next, the linear motion mechanism 124 is operated to grip the leg LP with the pair of holding members 122, and at the same time, the gripping force of the pair of holding members 122 is used to position the support member 130 under the wave-dissipating block (Step S38 in FIG. 7, FIG. 8(B)).

[0047] Then, the work machine 100 pulls up the main wire Mw and the sub-wire Sw to raise the wave-dissipating block holding device 110 and move the wave-dissipating block CB (Fig. 7, step S40, Fig. 4(C)). At this time, the wave-dissipating block holding device 110 is suspended in the air mainly by the main wire Mw, so that it is rotated by approximately 90 degrees, and the leg LP that was facing upward now faces sideways, and the leg LP that was facing sideways now faces downward.

[0048] Next, the procedure for placing the grasped wave-dissipating block CB explained using Figure 7 and Figures 8(A) to (C) in a predetermined position will be explained using Figures 9 and 10(A) to (C). Here, for example, a case will be explained in which the leg parts LP are placed downward on top of the wave-dissipating block CB arranged in the first tier so that the leg parts LP interlock with each other.

[0049] First, the wave-dissipating block holding device 110 holding the wave-dissipating block CB is placed in the air above a predetermined position by the work machine 100. Then, the main wire Mw and the sub-wire Sw are extended to lower the wave-dissipating block holding device 110 (Step S42 in FIG. 9, FIG. 10(A)).

[0050] Then, when a part of the wave-dissipating block CB has reached the designated position, the speed at which the main wires Mw and the auxiliary wires Sw are extended is slowed down to place the wave-dissipating block CB completely in the designated position (Step S44 in FIG. 9, FIG. 10(B)).

[0051] Next, the linear motion mechanism 124 is operated to increase the distance between the pair of holding members 122 (Step S46 in FIG. 9), thereby releasing the wave-dissipating blocks CB (Step S48 in FIG. 9).

[0052] Then, the main wires Mw and the sub-wires Sw are pulled up to raise the wave-dissipating block holding device 110, thereby separating the wave-dissipating block holding device 110 from the wave-dissipating block CB (step S50 in FIG. 9, FIG. 10(C)).

[0053] In other words, when the wave-dissipating block CB is positioned with one leg LP facing downward, a pair of retaining members 122 retain a leg LP different from that one leg LP, and a support member 130 positioned below the different leg LP supports the wave-dissipating block CB.

[0054] In this manner, in this embodiment, the wave dissipating block CB includes four legs LP extending in different directions, and includes a holding mechanism 120 and an engaging member 126 capable of holding the radial direction of two of the four legs LP. That is, the holding mechanism 120 and the engaging member 126 are configured to hold the radial direction of each of the two legs LP, and therefore do not require a holding mechanism large enough to embrace one leg LP in its entirety. Furthermore, since the engaging member 126 includes a curved member 128 and a support member 130, no drive mechanism is required, and the engaging member 126 can be configured light.

[0055] For example, according to conventional technology, for a wave-dissipating block weighing approximately 64 tons and measuring approximately 5 m in height, a gripping device would weigh approximately 36 tons and be approximately 9 m in height, whereas the wave-dissipating block gripping device 110 of this embodiment can be constructed to weigh less than 25 tons and be approximately 5 m in height.

[0056] In addition, in this embodiment, the configuration includes a linear motion mechanism 124 that penetrates the bracket 112 and has an end connected to each of the upper ends 122B of the pair of holding members 122, and rotates each of the pair of holding members 122. That is, in this embodiment, the linear motion mechanism 124 is disposed in the hollow portion of the mounting plate 114 of the bracket 112. For this reason, in the wave-dissipating block holding device 110, the distance from the end of the bracket 112 where the main mounting hole 114C is located to the tip end 122A of the pair of holding members 122, i.e., the vertical length of the wave-dissipating block holding device 110, can be made extremely short, and thus the weight can be further reduced.

[0057] Moreover, in this embodiment, the support member 130 is fixed to the curved member 128 and extends toward the tip end side of the pair of holding members 122, and is capable of supporting the wave-dissipating block CB. In other words, when one leg LP is supported by the pair of holding members 122, the other leg LP is not supported by the curved member 128, but the support member 130 supports the wave-dissipating block CB, so that at least two methods of holding the wave-dissipating block CB can be realized, the wave-dissipating block CB can be stably held and transported in various positions, and the wave-dissipating block CB can be arranged in various positions.

[0058] In this embodiment, the bracket 112 is provided with a change member (main mounting hole 114C and sub-mounting hole 114BA) that changes the positional relationship between the holding mechanism 120 and the engagement member 126 when the bracket 112 is rotatably supported by the work machine 100. Therefore, by changing the feed length of the sub-wire Sw relative to the main wire Mw, the attitude of the wave-dissipating block holding device 110 can be changed significantly not only when holding the wave-dissipating block CB but also when placing the wave-dissipating block CB. This makes it possible to change the attitude of the wave-dissipating block holding device 110 according to the attitude of the wave-dissipating block CB and hold and lift the wave-dissipating block CB. In particular, since the leg LP, which was facing almost horizontally, can be placed with the leg LP facing downward, the wave-dissipating block CB can be stacked in layers while interlocking with the leg LP of the wave-dissipating block CB. However, this is not limited to this, and the wave-dissipating block CB may be held and transported after changing the attitude of the wave-dissipating block CB so that the two leg parts LP can be easily held using another work machine. In addition, when the wave-dissipating block CB is transported and placed at a predetermined position, it may be temporarily placed near the predetermined position and then changed to the desired position using another work machine or the like.

[0059] In this embodiment, the direction of the tip end side of the pair of holding members 122 and the direction of the tip end side of the support member 130 are configured to intersect. For example, assume that one leg LP of the wave-dissipating block CB is held by the pair of holding members 122 with some play, and the wave-dissipating block CB is held in a form in which the support member 130 supports the wave-dissipating block CB. Even in this case, it is possible to continue to stably hold the wave-dissipating block CB even if the wave-dissipating block holding device 110 is rotated by 90 degrees or more in a state in which the wave-dissipating block CB is suspended. However, this is not limited to this, and the direction of the tip end side of the pair of holding members and the direction of the tip end side of the support member may be parallel or may be configured to move away from each other. If one leg LP of the wave-dissipating block CB is firmly held by the pair of holding members, it is possible to rotate the wave-dissipating block holding device accordingly in a state in which the wave-dissipating block CB is suspended.

[0060] In this embodiment, the center position C of the inner shape of the pair of holding members 122 when the wave-dissipating block CB is held is located on the support member 130 when the pair of holding members 122 is viewed in a plan view. For this reason, for example, as shown in FIG. 8(B), when the wave-dissipating block CB is held, the support member 130 can be disposed under the center of gravity of the wave-dissipating block CB. In other words, when the pair of holding members 122 appropriately hold the leg portion LP, the wave-dissipating block CB can be stably supported by the support member 130. At the same time, it is possible to continue to hold the wave-dissipating block CB stably even if the wave-dissipating block holding device 110 is rotated by 90 degrees or more while the wave-dissipating block CB is suspended. However, this is not limited to this, and the center position C of the inner shape of the pair of holding members when the wave-dissipating block CB is held does not have to be located on the support member when the pair of holding members is viewed in a plan view. If one leg LP of the wave-dissipating block CB is firmly held by a pair of holding members, the wave-dissipating block CB can be supported by the supporting members in an appropriately stable manner.

[0061] In this embodiment, the first plane PP including the curved member 128 intersects with the second plane SP including the pair of holding members 122 at an acute angle and is perpendicular to the direction of the tip end side of the support member 130. Therefore, it is easy to hold the two legs LP of the wave-dissipating block CB with the curved member 128 and the pair of holding members 122. Since the curved member 128 and the direction of the tip end side of the support member 130 are perpendicular to each other, it is easy to attach the support member 130 to the curved member 128 and it is possible to make it difficult to deform. Note that this is not limited to the above, and the first plane PP including the curved member does not necessarily have to intersect with the second plane SP including the pair of holding members at an acute angle, and the first plane PP including the curved member does not necessarily have to be perpendicular to the direction of the tip end side of the support member.

[0062] In this embodiment, the bracket 112 is symmetrical with respect to the third plane TP, and the pair of holding members 122 and the engaging member 126 are symmetrical with respect to the third plane TP. This makes it possible to reduce the costs involved in manufacturing, quality, and assembly compared to when the bracket 112, the pair of holding members 122, and the engaging member 126 are not symmetrical. However, this is not limiting, and the bracket, the pair of holding members, and the engaging member do not have to be symmetrical.

[0063] In this embodiment, the bracket 112 includes a pair of mounting plates 114. The pair of holding members 122 are supported rotatably on the outer sides of the pair of mounting plates 114, and the ends of the engagement members 126 are connected to the pair of mounting plates 114. In other words, the positions of the rotation axes on which the pair of holding members 122 are supported are separated from each other, so that the pair of holding members 122 can deeply grip the leg portion LP so that the leg portion LP comes into contact with the rotation support portion 118. Similarly, the positions of the ends of the engagement members 126 are separated from each other, so that the engagement members 126 can deeply grip the leg portion LP so that a part of the leg portion LP fits between the mounting plates 114. Therefore, even if the wave-dissipating block holding device 110 is small and lightweight, it is possible for the wave-dissipating block CB with a relatively large leg portion LP to be stably held by the wave-dissipating block holding device 110. However, this is not limited to this, and the bracket does not have to include a pair of mounting plates. Alternatively, the bracket may include a pair of mounting plates, and the pair of holding members may be rotatably supported on the inner sides of the pair of mounting plates. Furthermore, the end of the engaging member may be connected to a portion other than the pair of mounting plates.

[0064] In addition, in this embodiment, it is assumed that the linear motion mechanism 124 uses oil or water. When oil is used, the pump unit of the work machine 100 may be used, but it is more preferable to prepare a new work machine (not shown) and use the pump unit, since the operation of the wave-dissipating block gripping device 110 does not affect the operation of the work machine 100 (basically, pump units that generate hydraulic pressure are not common). When water is used, a pump unit that sucks up water can be used. In this case, the larger the pump unit, the higher the discharge capacity and the quicker the operation of the holding mechanism 120 can be performed, but a small, general-purpose pump unit may also be used. This is because the object to be gripped is a wave-dissipating block CB, which is heavy, and since the work must be carried out carefully, it may be preferable not to make the operation speed of the holding mechanism 120 too fast. In addition, if the pump unit uses an engine, there is no need to prepare a separate power source, and there are few restrictions on the place where it can be used. For this reason, if water is used, a pump unit can be easily prepared. Furthermore, since the wave-dissipating block CB is used in a place where there is water, problems with obtaining water, leaking, and discharging are unlikely to occur. In addition, this is not limited to this, and air or the like may be used as the fluid. Of course, the linear motion mechanism may use an electric motor.

[0065] Therefore, in this embodiment, it is possible to provide a wave-dissipating block gripping device 110 that can grip and move the wave-dissipating blocks CB safely without the need for dangerous manual slinging of wires, and that is small and lightweight and can arrange the wave-dissipating blocks CB in various postures. That is, the wave-dissipating block gripping device 110 can be manufactured at a lower cost than the conventional technology, and can be easily transported, installed, and used. For example, even when the wave-dissipating blocks CB are stacked in layers by engaging the legs LP, the wave-dissipating blocks CB can be moved quickly and reliably.

[0066] 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 without departing from the gist of the present invention.

[0067] For example, in the first embodiment, the wave-dissipating block holding device 110 is connected to the arm body 102 via the main wire Mw and the sub-wire Sw, but the present invention is not limited to this. For example, it may be as shown in the second embodiment in FIG. 11. In the second embodiment, the wave-dissipating block holding device 110 is configured to be directly connected to the tip of the arm body so that its posture can be controlled. The second embodiment will be described below. The main difference from the first embodiment is the work machine 200, and the wave-dissipating block holding device 110 is the same.

[0068] In this embodiment, the work machine 200 is a backhoe with a bendable arm body 202, as shown in FIG. 11. That is, the work machine 200 is configured to include a main body 201 movable on an endless track, and an arm body 202 swingably supported by the main body 201. The wave-dissipating block gripping device 110 is attached and supported by a support shaft and a link shaft provided at the tip of the arm body 202, in the same manner as a normal work attachment (e.g., a cutter, a grapple, etc.) (the support shaft and the main mounting hole 114C, and the link shaft and the sub-mounting hole 114CA are directly connected, respectively). That is, the wave-dissipating block gripping device 110 is attached to the arm body 202, which enables control of the rise and fall and rotation and swing of the wave-dissipating block gripping device 110. That is, the pair of mounting plates 114 are directly connected to sandwich the tip of the arm body 202 and are configured to be perpendicular to the rotation axis when the arm body 202 swings and rotates.

[0069] As described above, in this embodiment, since the work machine 200 is a backhoe, it is possible to easily and quickly control the attitude of the wave-dissipating blocks CB when placing the wave-dissipating blocks CB.

[0070] In the above embodiment, the wave-dissipating block CB has four legs LP, but the present invention is not limited to this, and the wave-dissipating block CB may have two or more legs LP (in the case of two legs LP, this also applies to cases where the orientations of the legs LP are different even in a single wave-dissipating block CB). [Industrial Applicability]

[0071] The present invention is suitable for moving, transporting and installing wave-dissipating blocks having multiple legs extending in different directions, which are used in ports and the like. [Explanation of symbols]

[0072] 100, 200...Work machine 101, 201...Main body 102, 202...Arm body 104…Main wheel 106…Relay wheel 110...Wave-dissipating block gripping device 112…Bracket 114...Mounting plate 114A…Aperture 114B…Mounting protrusion 114BA…Secondary mounting hole 114C…Main mounting hole 116, KB...Connection part 118... Rotating support part 120...holding mechanism 122... Retaining member 122A, 130A...Tip 122B…Top end 122C…Contact part 124...Linear motion mechanism 126...Engagement member 128...Curved member 128A...end 130...Support member 130B…Reinforcement section 130C…Buffer section C…center CB: Wave-dissipating block GD…Ground Hs…Hose LP…legs Mw…Main wire PP…1st plane RL…Laura SL…Rod SP…Second plane Sw...Secondary wire TP…Third plane 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 holding mechanism and an engagement member capable of holding each of two legs of the plurality of legs in a radial direction; a bracket that is rotatably supported on the work machine and supports the holding mechanism and the engagement member; Equipped with the holding mechanism includes a pair of holding members that are rotatably supported by the bracket and that can grip one of the two legs when their tip ends approach each other, and a linear motion mechanism that penetrates the bracket, has an end connected to each of the upper ends of the pair of holding members, and drives each of the pair of holding members to rotate; The wave-dissipating block gripping device is characterized in that the engaging member comprises a curved member having an inner diameter of a ring formed by attaching both ends to the bracket, the inner diameter being equal to or greater than the minimum outer diameter of the leg, and a support member fixed to the curved member, extending toward the tip ends of the pair of retaining members, and capable of supporting the wave-dissipating block.

2. In claim 1, A wave-dissipating block gripping device, characterized in that the direction of the tip ends of the pair of holding members and the direction of the tip ends of the support members are configured to intersect.

3. In claim 1, A wave-dissipating block gripping device characterized in that, when the wave-dissipating block is gripped, the center position of the inner shape of the pair of holding members is located on the support member when the pair of holding members are viewed in a plane.

4. In claim 1, A wave-dissipating block gripping device characterized in that a first plane including the curved member intersects with a second plane including the pair of retaining members at an acute angle and is perpendicular to the direction of the tip side of the support member.

5. In claim 1, The bracket is shaped symmetrically with respect to a third plane that is perpendicular to a second plane including the pair of holding members and is equidistant from each of the pair of holding members; and A wave-dissipating block gripping device characterized in that the pair of retaining members and the engaging member are shaped symmetrically with respect to the third plane.

6. In claim 1, A wave-dissipating block gripping device characterized in that the bracket is provided with a change member that changes the positional relationship between the holding mechanism and the engaging member when the bracket is rotatably supported by the work machine.

7. In any one of claims 1 to 6, The bracket includes a pair of mounting plates; A wave-dissipating block gripping device characterized in that each of the pair of retaining members is rotatably supported outside the pair of mounting plates, and an end of the engaging member is connected to each of the pair of mounting plates.

8. 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 holding mechanism and an engagement member capable of holding each of two legs of the plurality of legs in a radial direction; and a bracket rotatably supported on the work machine and supporting the holding mechanism and the engagement member, The holding mechanism includes a pair of holding members that are rotatably supported by the bracket and that can grip one of the two legs by bringing their tip ends closer to each other, and a linear motion mechanism that penetrates the bracket and has ends connected to the upper ends of the pair of holding members, respectively, and rotates the pair of holding members. The engaging member includes a curved member having an inner diameter of a ring formed by attaching both ends to the bracket that is equal to or larger than the minimum outer diameter of the legs, and a support member that is fixed to the curved member, extends toward the tip ends of the pair of holding members, and is capable of supporting the wave-dissipating block. When the wave dissipating block is arranged with one of the legs facing upward, the curved member holds the one leg, and the pair of holding members holds the other leg, When the wave-dissipating block is arranged with one of the legs facing downward, the pair of holding members holds a leg other than the one leg, and the support member arranged under the other leg supports the wave-dissipating block. The wave-dissipating block gripping device is characterized by the above.

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