Stone throwing device

Abstract

To provide a riprap feeding device capable of making a construction efficient.SOLUTION: In a process in which movable plates 11L, 11R move from a lower end position to an upper end position, first rooms 21L, 21R, second rooms 22L, 22R, and third rooms 23L, 23R successively open. Thus, riprap 10 stored in the first rooms 21L, 21R, the second rooms 22L, 22R, and the third rooms 23L, 23R is successively fed onto a cable 61 on the sea bottom 60. In one cycle (from a start of bringing-down of a riprap feeding device 1 onto the sea bottom 60, via feeding of the riprap 10, until completion of bringing-up of the riprap feeding device 1 from the sea bottom 60), feeding of the riprap 10 can be carried out three times. Construction efficiency of a riprap coating method can be improved to largely reduce a construction period.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a device for dumping protective riprap onto, for example, a cable laid on the seabed. [Background technology]

[0002] Patent Document 1 discloses an underwater riprap dumping device that operates the crane of a crane ship to project a marker onto the sea surface from a chute platform installed on the seabed, and then operates the swing arm and bucket of a rock-throwing bucket ship to dump riprap using the marker as a guide. This underwater riprap dumping device is applied to the construction of riprap mounds that serve as the foundations of breakwaters and revetments.

[0003] By the way, a riprap covering method, in which protective riprap is placed on the cable, is known as a method for protecting undersea power transmission lines and communication cables (hereinafter referred to as "cables") laid on the seabed. This riprap covering method is applied when burying cables in rocky areas or at great depths where burying them on the seabed is difficult. The following explanation assumes the application of the riprap covering method to an area with a water depth of 70 m and a tidal current speed of 7 kn.

[0004] Conventionally, a riprap covering method involves lowering a grab bucket holding riprap (crushed rock) to the seabed from a work vessel such as a grab dredger or crane ship, and then releasing the bucket on a cable. With this method, the amount of riprap dumped onto the cable in one cycle (from the start of lowering the grab bucket to the seabed, through dumping the riprap, to the completion of lifting the grab bucket) is small, resulting in low construction efficiency and a long construction period.

[0005] On the other hand, in the case of the rubble covering method using tremie pipes, it is difficult to accurately position the tremie pipes on the cable due to the influence of tidal currents, and the accuracy of construction is an issue. In addition, there is a risk of damage to the tremie pipes that are extended to the seabed due to rocking. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 6-49846 Summary of the Invention [Problem to be solved by the invention]

[0007] An object of the present invention is to provide a riprap dumping device that can streamline construction work. [Means for solving the problem]

[0008] The riprap dumping device of the present invention is a riprap dumping device for dumping riprap onto a cable laid on the seabed, and includes a box-shaped bucket into which the riprap is dumped, a movable plate provided within the bucket to laterally divide the inside of the bucket, and a movable plate provided within the bucket, a vertical plate disposed parallel to the movable plate and a downwardly sloping plate extending from a lower end edge of the vertical plate to the movable plate, The space partitioned by the movable plate is partitioned into adjacent chambers arranged side by side. bulkhead and, Installed on the ship, The movable plate is driven in the vertical direction. lifting weight a device, the lower end of each chamber being closed by the movable plate, Lifting device The movable plate is sequentially released in the process of lifting it from the lower end position to the upper end position. It is arranged as follows: It is characterized by: Effect of the Invention

[0009] According to the present invention, construction using the rubble covering method can be made more efficient. [Brief description of the drawings]

[0010] [Figure 1] FIG. 2 is a front view of the rubble dumping device according to the present embodiment. [Diagram 2] FIG. 2 is a right side view of the rubble dumping device according to the present embodiment. [Diagram 3] FIG. 2 is a plan view of the rubble dumping device according to the present embodiment. [Figure 4] FIG. 2 is an explanatory diagram of the present embodiment, and is a front view conceptually showing the structure of the bucket. [Diagram 5]FIG. 2 is an explanatory diagram of the present embodiment, being a perspective view conceptually showing the structure of a bucket. [Figure 6] FIG. 2 is a conceptual diagram of construction using the riprap dumping device according to this embodiment. [Figure 7] FIG. 2 is an explanatory diagram of construction using the riprap dumping device according to this embodiment. [Figure 8] FIG. 1 is a diagram showing the construction status and outfitting when the rubble covering method is applied. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] An embodiment of the present invention will now be described with reference to the accompanying drawings. Hereinafter, a description will be given of a riprap dumping device 1 applied to a riprap covering method for placing riprap 10 (crushed rock) on a cable 61 (submarine power transmission line, communication cable, etc., see FIG. 7) laid on the seabed 60. Here, a plane V1 in FIG. 3 is a symmetrical plane (hereinafter referred to as "vertical plane V1") that divides the inside of a bucket 2, which will be described later, symmetrically in the left-right direction. Also, a plane V2 in FIG. 3 is a symmetrical plane (hereinafter referred to as "vertical plane V2") that divides the inside of the bucket 2 symmetrically in the front-rear direction.

[0012] As shown in Figs. 1 to 3, the rubble dumping device 1 has a box-shaped bucket 2 that accommodates rubble 10 (see Fig. 7) dumped by a backhoe or the like. The bucket 2 has a frame 3 (frame structure) made of steel materials such as angle bars, pipes, and flat bars. Four corners of the bottom 9 of the bucket 2 are provided with legs 19 that support the bucket 2 at a certain height above the ground surface (the deck of a ship 55, the seabed 60, etc.). The four side walls of the bucket 2, i.e., the front wall 4, the rear wall 5, the left side wall 6, and the right side wall 7, are made of expanded metal that prevents the rubble from leaking out of the bucket 2 through gaps in the frame 3 and allows the rubble 10 to be seen from the outside.

[0013] A pair of movable plates 11L, 11R facing each other with a gap in the left-right direction are provided inside the bucket 2. The movable plates 11L, 11R are symmetrical with respect to a vertical plane V1 (see FIG. 3). The movable plates 11L, 11R are parallel to the vertical plane V1. The movable plates 11L, 11R are movable in the up-down direction with their vertically extending edge portions on both the left and right sides guided by multiple pairs of guide rollers 30 provided on the front wall 4 and rear wall 5 of the bucket 2.

[0014] Protrusions 13L, 13R protruding forward and backward are provided on the upper end portions 12L, 12R of the movable plates 11L, 11R. The movable plates 11L, 11R are suspended (hanging) by the frame 3 as the respective protrusions 13L, 13R are engaged (hooked) with the opening periphery 8 on the upper end side of the bucket 2. Flat bars 14, 14 are installed between the opposing protrusions 13L, 13R between the movable plates 11L, 11R. That is, the upper end portions 12L, 12R of the movable plates 11L, 11R are connected by a pair of front and rear flat bars 14, 14 extending in the left-right direction.

[0015] Brackets 15L, 15R are provided at the center in the front-rear direction of the upper ends 12L, 12R of the movable plates 11L, 11R. Lower ends of sockets 17L, 17R are connected to the brackets 15L, 15R via shaft members 16L, 16R extending in the front-rear direction. That is, the sockets 17L, 17R can rotate around the shaft members 16L, 16R. One end side of wire ropes 18L, 18R is connected to the upper part of the sockets 17L, 17R. The other end side of the wire ropes 18L, 18R is wound up by a lifting device (driving device, not shown) provided on a crane 56 (see FIG. 8) on a ship 55, thereby lifting up the movable plates 11L, 11R.

[0016] 1 to 5, a partition wall 25L (fixed plate) is provided between the movable plate 11L and the left side wall 6 of the bucket 2 to divide the space between the movable plate 11L and the left side wall 6 into a first chamber 21 on the outside (left side) and a second chamber 22 on the inside (right side). The partition wall 25L has a vertical plate 26L arranged parallel to the movable plate 11L and the left side wall 6 of the bucket 2, and an inclined plate 27L extending from the lower end edge of the vertical plate 26L to the movable plate 11L and inclined at an inclination of 45 degrees. As a result, a second chamber 22L is defined in the bucket 2 by the movable plate 11L, the partition wall 25L, the front side wall 4, and the rear side wall 5. The inclination (inclination angle) of the inclined plate 27L is not limited to 45 degrees.

[0017] An inclined plate 29L is provided inside the bucket 2, which is disposed below the partition wall 25L and is parallel to the inclined plate 27L. That is, the inclined plate 29L is inclined at an inclination angle of 45 degrees. The inclined plate 29L extends from the left side wall 6 of the bucket 2 to the lower end of the movable plate 11L. As a result, a first chamber 21L is defined inside the bucket 2 by the left side wall 6, the partition wall 25L, the inclined plate 29L, the front side wall 4, and the rear side wall 5.

[0018] Meanwhile, a central partition 31 (fixed plate) is provided between the movable plates 11L, 11R, disposed on the vertical plane V1, i.e., parallel to the movable plates 11L, 11R. The central partition 31 extends from the upper end (opening peripheral portion 8) of the bucket 2 to the middle position of the height of the bucket 2. The central partition 31 has a vertical plate 32 and an inclined plate 33L that extends from the lower end edge of the vertical plate 32 to the movable plate 11L and inclines at an inclination of 45 degrees. Thus, a third chamber 23L is defined in the bucket 2 by the movable plate 11L, the central partition 31, the front side wall 4, and the rear side wall 5. The central partition 31 has an inclined plate 33R that extends from the lower end edge of the vertical plate 32 to the movable plate 11R and inclines at an inclination of 45 degrees. That is, the cross section of the central partition 31 by the vertical plane V2 is formed in an inverted Y shape.

[0019] Here, the distance from the lower end edge of the inclined plate 29L to the lower end edge of the inclined plate 27L of the partition 25L, i.e., the opening height H1 (see FIG. 4) of the rubble discharge port 35L (lower end) of the first chamber 21L is set to be the same (H1=H2) as the distance from the lower end edge of the inclined plate 27L of the partition 25L to the lower end edge of the inclined plate 33L of the central partition 31, i.e., the opening height H2 (see FIG. 4) of the rubble discharge port 36L (lower end) of the second chamber 22L. Furthermore, the width W1 of the first chamber 21L, the width W2 of the second chamber 22L, and the width W3 of the third chamber 23L (all see FIG. 4) are also set to be approximately the same.

[0020] The first chamber 21L is provided with a first input amount adjustment means 41L for adjusting the capacity of the first chamber 21L to the capacity of the third chamber 23L. The first input amount adjustment means 41L has a pair of partitions 42, 42 arranged to be symmetrical with respect to a vertical plane V2 (see FIG. 3) as a plane of symmetry. The front partition 42 has an inclined plate 43 that is inclined downward at an angle of 45 degrees from the vicinity of the upper end of the front wall 4 of the bucket 2 toward the vertical plane V2, and a vertical plate 44 that extends from the lower edge of the inclined plate 43 to the inclined plate 29L. In order to avoid duplication of explanation, a description of the rear partition 42 will be omitted.

[0021] On the other hand, the second chamber 22L is provided with a second input amount adjustment means 45L for adjusting the capacity of the second chamber 22L to the capacity of the first chamber 21L and the third chamber 23L. The second input amount adjustment means 45L has a pair of partition walls 46, 46 arranged to be symmetrical with respect to a vertical plane V2 (see FIG. 3) as a plane of symmetry. The front partition wall 46 has an inclined plate 47 that is inclined downward at 45 degrees from the vicinity of the upper end of the front wall 4 of the bucket 2 toward the vertical plane V2, and a vertical plate 48 that extends from the lower end edge of the inclined plate 47 to the inclined plate 27L of the partition wall 25L. In order to avoid duplication of explanation, the explanation of the rear partition wall 46 will be omitted.

[0022] Bucket 2 is configured to be symmetrical with respect to vertical plane V1. Therefore, the configuration on the right side of vertical plane V1 in bucket 2 is simply given the reference numerals corresponding to those in the drawings, and redundant description will be omitted.

[0023] 6, the frame 3 of the riprap dumping device 1 is provided with a transponder 51, four underwater lights 52 (only three are shown in FIG. 6) that illuminate the seabed 60, and two underwater cameras 53 (only one is shown in FIG. 6). The transponder 51 provides (transmits a signal) information on the position, course, speed, etc. of the riprap dumping device 1 to a receiving device (not shown) installed on a ship 55 (see FIG. 8). The imaging signal of the underwater camera 53 is output as an image to a monitor (not shown) installed on the ship.

[0024] One end of a plurality of wire ropes 20 (only two are shown in FIG. 6) is connected to the frame 3. The other end of the wire rope 20 is paid out by a lifting device (driving device, not shown) provided on a crane 56 (see FIG. 8) on a ship 55, thereby pulling down the rubble dumping device 1, and on the other hand, the other end of the wire rope 20 is wound up by the lifting device, thereby pulling up the rubble dumping device 1.

[0025] Next, a construction procedure for dumping riprap 10 (crushed rock) onto a cable 61 (see FIG. 7) laid on the seabed 60 by the riprap dumping device 1 will be described. As shown in Fig. 8, a ship 55 that performs construction work in the site sea area is equipped with a crane 56. In addition, the ship 55 carries a necessary amount (e.g., two days' worth) of riprap 10, a wheel loader 57, and a backhoe 58.

[0026] First, the backhoe 58 dumps riprap 10 into each chamber of the bucket 2 of the riprap dumping device 1 placed on the deck of the ship 55, i.e., the first chambers 21L, 21R, the second chambers 22L, 22R, and the third chambers 23L, 23R. Next, the crane 56 lifts the riprap dumping device 1, and the wire rope 20 is let out by a lifting device (not shown) mounted on the crane 56 to sink the riprap dumping device 1 to the seabed 60. Then, the riprap dumping device 1 is positioned at a first position (see FIG. 7) on the cable 61 on the seabed 60 using monitoring means such as the transponder 51, the underwater camera 53, and an ROV 59 (Remote Operated Vehicle). Note that the legs 19 of the riprap dumping device 1 may be floating rather than being grounded on the seabed 60.

[0027] Next, while checking the situation with monitoring means such as the underwater camera 53 and ROV 59, the wire ropes 18L, 18R are wound up by the lifting device mounted on the crane 56 to raise the movable plates 11L, 11R to a certain height, and the riprap discharge ports 35L, 35R (lower end) of the first chambers 21L, 21R of the bucket 2 are opened. As a result, as shown in Fig. 7, the riprap 10 in the first chambers 21L, 21R is dumped onto the cable 61 from the riprap discharge ports 35L, 35R. After dumping is complete, the wire ropes 18L, 18R are paid out by the lifting device to pull the movable plates 11L, 11R down to the lower end position.

[0028] Next, while checking the situation with monitoring means such as the underwater camera 53 and ROV 59, the crane 56 is operated to position the riprap dumping device 1 at the second position (see FIG. 7). Here, the riprap dumping device 1 positioned at the second position is positioned so as to overlap the riprap dumping device 1 positioned at the first position by a certain length (for example, 0.5 m).

[0029] Next, while checking the situation with monitoring means such as the underwater camera 53 and ROV 59, the wire ropes 18L, 18R are wound up by the lifting device mounted on the crane 56 to raise the movable plates 11L, 11R to a certain height, and the riprap discharge ports 36L, 36R (lower end) of the second chambers 22L, 22R of the bucket 2 are opened. As a result, as shown in Fig. 7, the riprap 10 in the second chambers 22L, 22R is dumped onto the cable 61 from the riprap discharge ports 36L, 36R. After dumping is complete, the wire ropes 18L, 18R are paid out by the lifting device to pull the movable plates 11L, 11R down to the lower end position.

[0030] Next, while checking the situation with monitoring means such as the underwater camera 53 and ROV 59, the crane 56 is operated to position the riprap dumping device 1 at the third position (see FIG. 7). Here, the riprap dumping device 1 positioned at the third position is positioned so as to overlap the riprap dumping device 1 positioned at the second position by a certain length (for example, 0.5 m).

[0031] Next, while checking the situation with monitoring means such as the underwater camera 53 and ROV 59, the wire ropes 18L, 18R are wound up by the lifting device mounted on the crane 56 to pull up the movable plates 11L, 11R to the upper end position. As a result, the lower end of the third chamber 23L, 23R of the bucket 2 opens to the same height as the opening height H1 of the riprap discharge ports 35L, 35R of the first chambers 21L, 21R and the opening height H2 of the riprap discharge ports 36L, 36R of the second chambers 22L, 22R ("H1=H2" in this embodiment), that is, the height H1 (H2) from the lower end edge of the inclined plates 33L, 33R. As a result, the riprap 10 in the third chambers 23L, 23R is thrown onto the cable 61 from the riprap discharge ports 36L, 36R of the second chambers 22L, 22R via the second chambers 22L, 22R, as shown in FIG. 7.

[0032] After dumping is complete, the wire ropes 18L, 18R are paid out by the lifting device to lower the movable plates 11L, 11R to their lower end positions, and then the wire rope 20 is wound up by the lifting device mounted on the crane 56 to pull the riprap dumping device 1 up from the seabed 60. The riprap dumping device 1 pulled up from the seabed 60 is placed on the deck of the ship 55 by the crane 56, and the riprap 10 is dumped by the backhoe 58 into each chamber of the bucket 2, i.e., into the first chambers 21L, 21R, the second chambers 22L, 22R, and the third chambers 23L, 23R.

[0033] However, with the conventional riprap covering method using a grab bucket, the amount of riprap that could be dumped in one cycle (from the start of lowering the grab bucket to the seabed, through the dumping of riprap, to the completion of lifting the grab bucket) was small, resulting in low construction efficiency and long construction periods.

[0034] In contrast, in this embodiment, a box-shaped bucket 2 for accommodating riprap 10, a pair of movable plates 11L, 11R for dividing the interior of the bucket 2 in the left-right direction, a partition wall 25L for dividing the space between the left side wall 6 of the bucket 2 and the movable plate 11L into a first chamber 21L and a second chamber 22L adjacent to each other in the left-right direction, a partition wall 25R for dividing the space between the right side wall 7 of the bucket 2 and the movable plate 11R into a first chamber 21R and a second chamber 22R adjacent to each other in the left-right direction, and a partition wall 25R for dividing the space between the opposing movable plates 11L, 11R adjacent to each other in the left-right direction. The rubble dumping device 1 is configured to have a central partition 31 that divides the first chamber 21L, 21R into adjacent third chambers 23L and 23R, and as the movable plates 11L, 11R move from the lower end position to the upper end position, the lower ends of the first chambers 21L, 21R, the second chambers 22L, 22R, and the third chambers 23L, 23R are opened sequentially, thereby allowing the rubble 10 contained in the first chambers 21L, 21R, the second chambers 22L, 22R, and the third chambers 23L, 23R to be dumped sequentially onto the cable 61 on the seabed 60. As a result, in this embodiment, after the riprap 10 in the first chambers 21L, 21R has been completely dumped, and after the riprap 10 in the second chambers 22L, 22R has been completely dumped, the riprap dumping device 1 can be moved along the cable 61 on the seabed 60 to dump the riprap 10 three times in one cycle (from the start of lowering the riprap dumping device 1 to the seabed 60, through dumping the riprap 10, to the completion of pulling the riprap dumping device 1 up from the seabed 60). In other words, the amount of riprap 10 that can be dumped in one cycle can be increased to three times that of the conventional method. As a result, it is possible to improve the construction efficiency of the riprap covering method, and the construction period can be significantly shortened. Furthermore, with the conventional rubble covering method using tremie pipes, it was difficult to accurately position the tremie pipes on the cable due to the influence of tidal currents, making construction accuracy an issue. In contrast, in this embodiment, the riprap dumping device 1 is positioned while checking the situation using monitoring means such as an underwater camera 53 and an ROV 59, thereby improving the accuracy of construction. Furthermore, in this embodiment, the operation for opening and closing the movable plates 11L, 11R is substantially the same as the operation for opening and closing a conventional grab bucket, so that an increase in the burden on the operator can be prevented. [Explanation of symbols]

[0035] 1 Stone-throwing device, 2 Buckets, 11L, 11R Movable plates, 21L, 21R First chambers, 22L, 22R Second chambers, 23L, 23R Third chambers, 25L, 25R Partition walls (fixed plates), 31 Central partition wall (fixed plate)

Claims

1. A riprap dumping device for dumping riprap onto a cable laid on the seabed, comprising: A box-shaped bucket into which rubble is dumped, A movable plate provided in the bucket and dividing the inside of the bucket in a lateral direction; a partition wall provided in the bucket, the partition wall having a vertical plate arranged parallel to the movable plate and a downwardly inclined plate extending from a lower end edge of the vertical plate to the movable plate, the partition wall dividing a space defined by the movable plate into adjacent chambers arranged side by side; A lifting device is provided on the ship and drives the movable plate in a vertical direction. A rubble dumping device characterized in that the lower end of each chamber is closed by the movable plate and is arranged to be opened sequentially as the lifting device raises the movable plate from the lower end position to the upper end position.

2. 2. The rubble dumping device according to claim 1, wherein the bucket is provided with a capacity adjustment plate for adjusting the capacity of rubble contained in each chamber to be the same.

3. 3. The rubble dumping device according to claim 1 or 2, further comprising a monitoring means for monitoring the construction status.

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