JP3023473U - Grab bucket for removing wave-dissipating block - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a grab bucket for removing a wave-dissipating block, in which a crane having a direct winding capacity smaller than the weight of the grab bucket is used and the gripping force of the grab bucket is maintained. SOLUTION: Two sheaves 19 of a grab bucket 10
Suspension support wire 1 between the three sheaves 29 of the crane and the crane 27
2 is wound and its end portion 30 is connected and fixed to the upper frame 11 to suspend the glove bucket 10 so that the grab bucket 10 can be raised and lowered, and the upper frame 11 of the glove bucket 10 is also supported.
Twelve sheaves 20 are respectively arranged on the lower frame 15 and the lower frame 15, and the opening / closing wire 13 wound between the three sheaves 28 of the crane 27 and the two sheaves 18 of the grab bucket 10 is stretched to extend the sheaves 20. A grab bucket for removing a wave-dissipating block, characterized in that the glove 16 can be opened and closed by sequentially winding it up and down in between.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a grab bucket for removing wave-dissipating blocks. It uses a crane with a direct winding capacity that is less than the weight of the grab bucket, while maintaining the gripping force of the grab bucket.

[0002]

[Prior art]

 Various types of wave-dissipating blocks such as tetrapods installed inside and outside ports and rivers need to be removed at the time of port maintenance, land reclamation, construction of new structures, etc., or when they are damaged by wind and flood damage.

Conventionally, in the work of removing a wave-dissipating block in water, a diver lifts and removes it with a crane of a work boat while slinging a wire around each of the wave-dissipating blocks. However, the diver's slinging work always involves waves in the water facing the open sea, and because the waves are always muddy in the water, it is not possible to confirm the wave-dissipating block, so the diver does the work by hand. There are risks such as crashing into the wave-dissipating block or being sandwiched between the wave-dissipating blocks, and the slinging work is significantly restricted, so there are many difficulties in terms of construction and safety, and work efficiency is poor.

[0004] Therefore, it is a strong demand in the field to be able to remove the wave-dissipating block without diving. Therefore, a grab bucket-shaped gripping device specially devised for removing the tetrapod is provided. As shown in FIG. 7, in consideration of the peculiarity of the form of the Tetrapod 1, three arms 3 for gripping the substantially spherical body 1a having four corners 1b protruding therefrom are provided. 8 are glove bucket-shaped devices 5 each of which can be opened and closed by a hydraulic cylinder 4, and the tetrapod 1 is suspended by a work boat or a crane 7 provided on a quay 6, as shown in FIG. It grabs and lifts and removes.

However, according to this apparatus, since the tetrapod in water is not visually checked and grasped, the position of the tetrapod in water and the corner 1b of the tetrapod 1 are searched. Therefore, the opening and closing operations of the arm 3 for gripping the body portion 1a are all dependent on the intuition of the operator, and thus it is difficult to say that the work efficiency is remarkably improved in the end, requiring experience and skill. Furthermore, since it was created exclusively for the removal of tetrapods, it cannot be used for objects other than tetrapods, which is uneconomical.

[0006] Therefore, it is considered to be a simple and easy method to remove the grab buckets used for dredging work with a work boat in which a crane is suspended. However, the grab buckets used for dredging work have a number of grabs. However, it is difficult to say that it is suitable for gripping the tetrapod 1 because there are many gaps between the grabs 3, and there are aspects that cannot be used as it is. However, among the grab buckets, there is an orange peel bucket that was created for the purpose of grasping solid materials such as rocks, not grasping earth and sand.

In a conventional orange peel bucket, as shown in FIG. 9, two support wires 12 are connected to an upper frame 11 of a bucket body 10 and suspended from a crane 40, and a crane 40 is used. Two open / close wires 13 depending from the above are wound around an upper sheave block 8 and a lower sheave block 9 composed of four sheaves 14, and their ends are locked 41 to a lower frame 15. The sheave blocks 8 and 9 are divided into left and right. The lower frame 15 rotatably supports six grabs 16 arranged at equal intervals in the circumferential direction, and the glove 16 and the upper frame 11 can rotate via six link rods 17. Are linked to.

Therefore, the bucket body 10 can be moved up and down by raising and lowering the support wire 12, and the glove 16 is opened and closed by raising and lowering the opening and closing wire 13 at the same time. Therefore, the bucket body 10 can be lowered into the water in which the tetrapod 1 is installed, and the glove 16 can be opened and grasped one by one. The calculation of the closing force (F) of the grab bucket own weight (W) in this case is as follows. Tension of one wire rope = W / 2 Upper frame winding number = 8 F = W / 2 x 8 = 4W

[0009]

[Problems to be solved by the device]

 However, the crane of the work boat that suspends and supports the grab bucket is required to have the self-weight of the support rope plus the ability to wind directly the hoisting block. Also, the gripping force of the grab bucket will be the lifting load of the crane.

Therefore, if a grab bucket having a large self-weight and a heavy self-weight is used, the direct winding capacity of the crane must be increased accordingly. If this happens, the size of the cranes and workboats will be increased, and this will not be able to respond immediately and the economic burden will increase.

Further, the leasing fee in case of leasing the crane is inevitably increased. For example, if the daily leasing fee for a crane with a direct winding capacity of 20 tons is approximately 500,000 yen, that for a crane with a direct winding capacity of 40 tons is approximately 1 million yen.

Therefore, the present invention is based on the premise that various wave-dissipating blocks installed inside and outside a port or river are removed using a grab bucket suspended from a crane such as a work boat. (EN) A method of removing a wave-dissipating block and a grab bucket for removal, which uses a crane with a small direct winding capacity, and is performed while holding the gripping force of the grab bucket.

[0013]

Means for Solving the Problems In order to solve the above-mentioned problems, a wave-dissipating block removing grab bucket according to the present invention has four sheaves rotatably arranged on the upper surface of an upper frame of the grab bucket. At the same time, 12 sheaves are rotatably arranged on the lower surface of the upper frame and 12 sheaves respectively on the upper surface of the lower frame, and 6 sheaves are rotatably arranged at the tip of the crane. The suspension wire is wound between the two sheaves on the top surface of the crane and the three sheaves of the crane, and its end is connected and fixed to the upper frame so that the grab bucket can be lifted and lowered. A lower frame is formed by winding an opening / closing wire between the other three sheaves of the above and the other two sheaves of the upper surface of the upper frame, and extending the opening / closing wire. Sequentially wound between the lower surface of the sheave of the upper surface and the upper over the frame, characterized that you have to allow opening and closing the grab by connecting and fixing an end portion of the closing wire either Appafu frame or Lower frame.

According to the present invention having the above-mentioned configuration, the supporting wire suspended from the crane and the opening / closing wire are hoisted and lowered, and the grab bucket is moved up and down to be submerged in water, and the wave-dissipating block is searched and opened / closed. Operate the wire to open and close the grab to grab the wave-blocking block, wind the support wire again, and remove the grab bucket holding the wave-blocking block from the water. This makes it possible to use a crane that has a direct winding capacity that is less than the weight of the grab bucket, and still maintain the gripping force of the grab bucket.

[0015]

[Embodiment of device]

 An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the bucket body 10 is composed of an upper frame 11, a link rod 17, a lower frame 15 and a grub 16, and is made by improving a known orange peel bucket. Normally, six grabs 16 are provided as an orange peel bucket, but in the present invention, three grabs 16 are provided so that a gap can be formed between the grabs 16, and the grabs 16 are arranged so as to be rotatable at equal intervals in the circumferential direction of the lower frame 15. It is set up.

A pair of suspension sheave blocks 18 a and 19 a are connected to the upper surface of the upper frame 11 via a bracket 22, and an upper sheave block 21 is provided on the lower surface of the upper frame 11. A lower sheave block 26 is arranged on the upper surface of the lower frame 15 so as to face the upper sheave block 21. The sheave block 18a for suspension supports winds the opening / closing wire 13, and the sheave block 19a for suspension supports winds the suspension support wire 12 (see FIG. 5). Further, the sheave blocks 18a and 19a for suspension support are connected to a bracket 22 fixed to the upper frame 11 by fixing a pair of arms 32 apart from each other.

As shown in FIG. 2, the suspension sheave blocks 18a and 19a respectively accommodate a total of four suspension sheaves 18 and 19 which are rotatably housed. A socket 23 is fixed to the bracket 22 for connecting one end of the suspension wire 12 around which the sheave 19 is wound.

As shown in FIG. 3, the upper sheave block 21 includes two blocks 24, which are formed by rotatably housing six sheaves 20 in a housing on the lower surface of the upper frame 11. Installed and fixed. As shown in FIG. 4, the lower sheave block 26 has two blocks 25 formed on the upper surface of the lower frame 15 in which six sheaves 20 are rotatably housed in a casing. They are arranged side by side in a letter arrangement and fixed. Therefore, twelve sheaves 20 are provided on the lower surface of the upper frame 11 and the upper surface of the lower frame 15, respectively. The blocks 25, 25 are arranged in a V shape in order to prevent the entanglement of the opening / closing wire 13. The arrangement of the blocks 24 and 25 is not limited to the V-shaped arrangement as long as the opening / closing wire 13 is prevented from being entangled.

As shown in FIG. 5, the crane for suspending and supporting the grab bucket 10 is provided with six sheaves 28 and 29, and the three sheaves 28 are used for winding the opening / closing wire 13. The remaining three sheaves 29 are used to wind the suspension wire 12.

Next, an example in which the suspension support wire 12 and the open / close wire 13 are wound around the sheaves 18, 19, 20, 28, 29 will be described with reference to FIG. The suspension wire 12 is vertically hung from the outside to the inside of the three sheaves 29 and the sheave 19 which are rotatably supported at the tips of the cranes 27, respectively, and their ends 30 are connected to the socket 23. To do. The open / close wire 13 is vertically hung from the outside to the inside of the other three sheaves 28 and the other three sheaves 18 rotatably supported at the tip of the crane 27, respectively, and the ends thereof are moved to the lower sheave block. The upper sheave block 21 and the upper sheave block 21 are successively wound up and down from the left end to the right end, and the end portion 31 is connected and fixed to the lower frame 15 or the upper frame 11.

As shown in FIG. 6, the open / close wire 13 is wound by sequentially winding the locking sheave 31 between the lower sheave block 26 and one block 24, 25 of the upper sheave block 21. The blocks 21 and 21 of 21 are bridged, and the blocks 24 and 25 of the other block are sequentially wound to reach the crane 27 from the block 25 of the lower sheave block 26. Note that FIG. 6 shows a case where the end portion of the opening / closing wire 13 is locked to the upper frame 11.

The operation of the above embodiment will be described. The raising and lowering operation of the bucket body 10 is performed by winding up and down the support wire 12 via the sheave 29 of the crane 27. In this case, the lifting force of the bucket body 10 is 1/5 via the pair of sheaves 29 of the crane 27 and the sheave 19 for suspension.

The opening / closing operation of the grab 16 is performed by hoisting and unwinding the opening / closing wire 13 via the sheave 28 of the crane 27. In this case, since the sheaves 20 of the upper and lower sheave blocks 21 and 26 are 12 respectively, the gripping force of the glove 16 is improved.

Therefore, the bucket body 10 suspended by the crane 27 is lowered into the water having the wave-eliminating block to be removed, the grab 16 is opened to search for the wave-eliminating block, and the grab 16 is placed between the corners of the wave-eliminating block. If the bucket breaker block is lifted, the breaker block can be removed without the diver's slinging work.

The calculation of the closing force (F) due to the weight (W) of the bucket body is as follows. Tension of one wire rope = W / 5 Upper frame winding number = 24 F = W / 5 x 24 = 4.8W

[0026]

[Effect of device]

 According to the present invention described above, the sheave is arranged on the upper frame of the bucket body, and the supporting wire and the opening / closing wire are arranged between the sheave at the tip of the crane, so that the series winding capacity is less than the weight of the grab bucket. The grab bucket can be suspended by the crane. That is, it is possible to use a grab bucket with a weight exceeding the direct winding capacity of the crane.

Also, by using 5 sheaves for suspension support, it is possible to lift 5 times the weight (grab bucket + wave-dissipating block) of a series wound crane, but the grip force of the grab is 1/5. Therefore, by setting the number of each of the upper sheave block and the lower sheave block to 12, it is possible to prevent the gripping force from becoming 1/5.

Further, since one open / close wire is wound between the upper sheave block and the lower sheave block, the wire is not twisted or damaged. Further, by using three orange peel buckets with grabs, it is possible to easily hold a wave-dissipating block such as a tetrapod.

[Brief description of drawings]

FIG. 1 is a partially omitted front view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional front view of a sheave for suspension support.

FIG. 3 is a bottom view (A) and a front view (B) of the upper frame.

FIG. 4 is a plan view (A) and a front view (B) of a lower frame.

FIG. 5 is a wiring diagram of FIG. 1;

FIG. 6 is a detailed wiring diagram of an upper sheave block and a lower sheave block.

FIG. 7 is a front view (A) and a partially omitted plan view (B) of a conventional wave-dissipating block gripping device.

FIG. 8 is an explanatory diagram of a wave elimination block removal state.

FIG. 9 is an explanatory diagram of an orange peel bucket.

[Explanation of symbols]

 10 ... Bucket main body 11 ... Upper frame 12 ... Support wire 13 ... Opening / closing wire 15 ... Lower frame 16 ... Grab 17 ... Link rod 18, 19, 20, 28, 29 ... Sheave 21 for suspension support ... Upper sheave block 24, 25 ... Block 26 ... Lower sheave block 27 ... Crane

Claims (5)

[Scope of utility model registration request] 1. A grab bucket has four sheaves rotatably arranged on an upper surface of an upper frame thereof, and twelve sheaves rotatably arranged on a lower surface of an upper frame and an upper surface of a lower frame, respectively. On the other hand, six sheaves are rotatably arranged at the tip of the crane, and a suspension wire is wound between the two sheaves on the upper surface of the upper frame and the three sheaves of the crane, and the ends thereof are uppered. The glove bucket is connected and fixed to the frame to suspend it so that it can be raised and lowered, and an open / close wire is wound between the other three sheaves of the crane and the other two sheaves on the upper surface of the upper frame, and the open / close wire is attached to the open / close wire. The wire is extended and sequentially wound between the sheaves on the upper surface of the lower frame and the lower surface of the upper frame, and the end portion of the opening / closing wire is connected to the upper frame or A grab bucket for removing wave-dissipating blocks, characterized in that the grab can be opened and closed by connecting and fixing it to one of the lower frames. 2. The wave-dissipating block removing grab bucket according to claim 1, wherein the sheaves on the lower surface of the upper frame and the upper surface of the lower frame are divided into two sheave blocks each having six sheaves. 3. The wave-dissipating block removing grab bucket according to claim 1, wherein the sheave blocks are arranged in a V shape. 4. The wave-dissipating block removing grab bucket according to claim 1, wherein the grab is an orange peel bucket. 5. The wave-dissipating block removing grab bucket according to claim 4, wherein the orange peel bucket has three grabs.