Rubble mound leveling device and rubble mound leveling method

Abstract

To provide a rubble mound leveling device capable of easily and accurately leveling a plane having a wider area than a lower end face of a leveling weight in a foundation rubble mound.SOLUTION: A rubble mound leveling device 1 comprises: a tower-shaped weight 4 having a longitudinal main body 41 and a polygonal bottom plate 42 provided at a lower end of the main body 41 and having a larger cross-sectional area than the main body 41; a guide member 6 having a plurality of guide grooves 64A-64E into which the main body 41 of the tower-shaped weight 4 is engaged so as to be able to slide longitudinally, the plurality of guide grooves 64A-64E being arranged in parallel in one direction perpendicular to the sliding direction of the main body 41; and a jack 7 for adjusting the inclination angle of the guide grooves 64A-64E of the guide member 6.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a rubble mound leveling device and a rubble mound leveling method. [Background technology]

[0002] A leveling weight is an existing technology used to level the top surface and slopes of underwater foundation rubble mounds. With this technology, when leveling the top surface, a leveling weight with a flat lower end surface is dropped onto the top surface of the foundation rubble mound by a crane barge. When leveling a slope, a slope leveling member is attached to the lower end of the weight body. The slope leveling member has an inclined surface at the bottom surface according to the inclination angle of the slope to be formed, and is fixed to the weight body by a bolt on the upper surface of the member. In this way, a weight with a slope leveling member attached to the weight body is dropped onto the rubble mound by a crane barge to level the slope (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2021-161674 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the case of the conventional method of leveling a foundation rubble mound using a weight as described in Patent Document 1, the leveling weight is hung from a crane installed on a crane ship and dropped onto the rubble mound by operating the crane. In this case, the base end of the crane is installed so as to be rotatable up and down relative to a rotating body that is installed so as to be rotatable on the deck of the crane ship.

[0005] Here, if it is necessary to carry out leveling work over an area larger than the area of ​​the bottom end face of the weight, it is desirable to shift the drop position of the weight in a predetermined direction in stages. However, it is difficult to adjust the drop position with precision due to the rotation of the rotating body and the vertical movement of the crane. It is also possible to adjust the drop position of the weight by changing the relative position of the crane ship with respect to the foundation rubble mound, but this makes the work complicated.

[0006] The present disclosure aims to provide a rubble mound leveling device and a rubble mound leveling method that can easily and accurately perform leveling work on a plane area wider than the lower end surface of a leveling weight on a foundation rubble mound. [Means for solving the problem]

[0007] A rubble mound leveling device according to one aspect of an embodiment of the present invention is a rubble mound leveling device for leveling the plane of an underwater foundation rubble mound, comprising: a tower-shaped weight having a longitudinal body and a polygonal bottom plate provided at the lower end of the body and having a larger cross-sectional area than the body; a guide member having a plurality of guide grooves into which the body of the tower-shaped weight is engaged so as to be able to slide longitudinally, the plurality of guide grooves being arranged in parallel in one direction intersecting the sliding direction of the body; and a tilt adjustment unit for adjusting the inclination angle of the guide grooves of the guide member, the tilt angle being adjusted by the tilt adjustment unit so that the bottom plate of the tower-shaped weight engaged with the guide grooves is positioned opposite the plane to be leveled, and the tower-shaped weight is allowed to fall freely along the sliding direction using at least a portion of the plurality of guide grooves to level the plane using the bottom plate. Effect of the Invention

[0008] According to the present disclosure, it is possible to provide a rubble mound leveling device and a rubble mound leveling method that can easily and accurately perform leveling work on a plane that is wider than the lower end surface of the leveling weight in a foundation rubble mound. [Brief description of the drawings]

[0009] [Figure 1]FIG. 1 is a diagram showing an example of the overall configuration of a rubble mound leveling device according to an embodiment. [Diagram 2] Plan view of the rubble mound leveling device shown in Figure 1 [Diagram 3] Three-view diagram of the tower-shaped weight in Fig. 1 and Fig. 2 [Figure 4] A diagram showing the two-point support pattern of a tower-type weight [Diagram 5] FIG. 2 is a diagram showing the lower end surface and the top end surface of the guide member in FIG. 1; [Figure 6] Side view to explain the first stage of the rubble mound leveling method [Figure 7] A plan view showing an example of the arrangement of tower-shaped weights corresponding to each guide groove by the rotation of the crane. [Figure 8] Plan view to explain the second stage of the rubble mound leveling method [Figure 9] Side view to explain the second stage of the rubble mound leveling method [Figure 10] Side view to explain the third stage of the rubble mound leveling method [Figure 11] Plan view to explain the fourth stage of the rubble mound leveling method [Figure 12] FIG. 13 is a schematic diagram showing an example of a slope leveling result in this embodiment. [Figure 13] FIG. 1 is a diagram showing an example of a conventional rubble mound leveling device according to a comparative example. [Figure 14] Schematic diagram showing an example of a slope leveling result according to a comparative example. [Figure 15] FIG. 13 shows an example of application of the present embodiment to leveling of the top surface. [Figure 16] FIG. 13 is a perspective view showing a modified example of the guide member; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment will be described with reference to the accompanying drawings. In order to facilitate understanding of the description, the same components in each drawing are denoted by the same reference numerals as much as possible, and duplicated description will be omitted.

[0011] In the following description, the X, Y, and Z directions are perpendicular to each other. The X and Y directions are horizontal, and the Z direction is vertical. The X direction is the arrangement direction of the crane ship 2 and the floating body 5, and is the extension direction of the multiple guide grooves 64A-64E of the guide member 6. The Y direction is the parallel arrangement direction of the multiple guide grooves 64A-64E of the guide member 6. For convenience of description, the Z positive direction side may be expressed as the upper side, and the Z negative direction side may be expressed as the lower side.

[0012] Fig. 1 is a diagram showing an example of the overall configuration of a riprap mound leveling apparatus 1 according to an embodiment. Fig. 2 is a plan view of the riprap mound leveling apparatus 1 shown in Fig. 1.

[0013] As shown in Figure 1, a large amount of rubble has been dumped into water 10 and piled up on the bottom of the water, such as the seabed, to form a foundation rubble mound 12. The rubble mound leveling device 1 is a device for leveling the flat surfaces of this foundation rubble mound 12 (for example, the upper top surface 12A and the inclined slope 12B of the edge).

[0014] The rubble mound leveling device 1 is equipped with a rudders-type weight 4 suspended from wires 33A, 33B of a crane 3 of a crane ship 2 so as to be able to rise and fall freely. The rudders-type weight 4 is formed in an elongated shape, with one end in the longitudinal direction connected to the wires 33A, 33B, whereby the other end is installed facing downward. The rubble mound leveling device 1 operates the crane 3 to drop the rudders-type weight 4 toward the flat surface of the foundation rubble mound 12 underwater 10. This allows the rudders-type weight 4 to press against the flat surface of the foundation rubble mound 12, leveling it.

[0015] In the example of Fig. 1, as shown by arrow B, the tower-shaped weight 4 is dropped toward the slope 12B of the plane of the foundation rubble mound 12, thereby leveling the portion of the slope 12B where the tower-shaped weight 4 hits. In the following explanation, the case where the slope 12B of the foundation rubble mound 12 is leveled using the rubble mound leveling device 1 will be described as an example.

[0016] 1 and 2, the crane 3 has a rotating body 31, a jib 32, and wires 33A and 33B. The rotating body 31 is installed, for example, on the deck of the crane ship 2, and can rotate about a rotation axis O along the Z direction.

[0017] The jib 32 is a longitudinal member connected to the rotating body 31 so as to be rotatable in the vertical direction. The base of the jib 32 is connected to the rotating body 31, and a horizontally extending rotation shaft is provided at the connection part, and the jib 32 is rotatable around this rotation shaft. In the state shown in Figs. 1 and 2, the rotation shaft of the jib 32 is in the Y direction, and the longitudinal direction of the jib 32 is arranged to face the X direction. As a result, the jib 32 is arranged to rotate around the Y axis around the base, and the tip part is movable in the vertical direction.

[0018] The wires 33A and 33B extend downward from the tip of the jib 32 and are connected at their tips to the tower-shaped weight 4 to suspend the tower-shaped weight 4. The two wires 33A and 33B are arranged at a predetermined interval along the longitudinal direction of the jib 32. In the state shown in Fig. 1, the two wires 33A and 33B are arranged in parallel along the X direction, with one wire 33A on the negative X direction side and the other wire 33B on the positive X direction side. The wire 33A is arranged closer to the base of the jib 32 than the wire 33B.

[0019] In the example of Fig. 1, the wire 33A is connected to a first suspension ring 43 provided on the top end surface of the tower-shaped weight 4 in the longitudinal direction, and the wire 33B is connected to a second suspension ring 44A that is located at the top among multiple suspension rings provided on the side surface of the tower-shaped weight 4 in the longitudinal direction. By being supported at two points in this manner, the tower-shaped weight 4 is suspended with its longitudinal direction inclined relative to the horizontal and vertical directions. Details of the configuration of the tower-shaped weight 4 will be described later with reference to Fig. 3.

[0020] As shown in Figures 1 and 2, the rubble mound leveling device 1 is equipped with a guide member 6. The guide member 6 is a member for guiding the falling direction of the tower-shaped weight 4. The guide member 6 is configured so that the inclination angle can be changed, and this also makes it possible to change the falling direction of the tower-shaped weight 4. The guide member 6 also has a number of guide grooves 64A-64E. The multiple guide grooves 64A-64E are formed in a shape into which the main body 41 (see Figure 3) of the tower-shaped weight 4 can be fitted and which allows sliding in the longitudinal direction.

[0021] The multiple guide grooves 64A to 64E are arranged in parallel in one direction intersecting the sliding direction of the main body 41 of the tower-shaped weight 4. For example, as shown in Fig. 2, the multiple guide grooves 64A to 64E are preferably arranged in parallel in a direction perpendicular to the sliding direction of the main body 41 of the tower-shaped weight 4. In the example shown in Fig. 2, the guide member 6 has five guide grooves 64A, 64B, 64C, 64D, and 64E formed to extend in the X direction and arranged in parallel in the Y direction.

[0022] As shown in FIG. 1, the rubble mound leveling device 1 is equipped with a pair of jacks 7A, 7B (tilt adjustment parts). The pair of jacks 7A, 7B are elements that adjust the tilt angle of the guide member 6. Note that while only one of the jacks 7A is shown in FIG. 1, the other jack 7B is disposed on the Y positive side (the rear side of the page) of the one jack 7A (see FIG. 5). The pair of jacks 7A, 7B are connected to both sides of the guide member 6 in the Y direction. Note that in the following explanation, the pair of jacks 7A, 7B may be collectively referred to as "jacks 7".

[0023] Fig. 3 is a three-view diagram of the tower-shaped weight 4 in Fig. 1 and Fig. 2. Fig. 3(A) is a plan view seen from the upper end surface 41A side. Fig. 3(B) is a front view seen from the side surface 41C where the multiple second hanging rings 44A to 44E are provided. Fig. 3(C) is a side view seen from another side surface perpendicular to the side surface 41C.

[0024] As shown in FIG. 3, the tower-shaped weight 4 has a longitudinal main body 41 and a polygonal bottom plate 42 provided at a lower end 41B of the main body 41 and larger in cross-sectional area than the main body 41. In the example of FIGS. 1 to 3, the main surface of the bottom plate 42 is square, and the lower end 41B of the main body 41 is disposed at the center of the square of the bottom plate 42 as shown in FIG. 3(A). In this embodiment, the main body 41 is a quadrangular prism, and each of the four side surfaces is disposed so as to extend parallel to the corner side surfaces of the square shape of the bottom plate 42. The bottom plate 42 is connected to the lower end 41B of the main body 41 so that the normal direction of the square bottom surface is the same as the longitudinal direction of the main body 41.

[0025] A first suspension ring 43 is provided on an upper end surface 41A of the main body 41. The first suspension ring 43 is connected to the wire 33A of the crane 3, and functions as a support part that suspends and supports the tower-shaped weight 4.

[0026] A plurality of second suspension rings 44 are provided on one side surface 41C of the main body 41. In the example of Figs. 1 to 3, five second suspension rings 44A, 44B, 44C, 44D, and 44E are provided on the side surface 41C, and are arranged in this order from the upper end surface 41A side to the lower end 41B side at approximately equal intervals along the longitudinal direction of the main body 41. Any one of the second suspension rings 44A to 44E is connected to the wire 33B of the crane 3, thereby functioning as a support part that suspends and supports the tower-shaped weight 4. Therefore, in this embodiment, the tower-shaped weight 4 is supported at two points by the first suspension ring 43 and any one of the second suspension rings 44A to 44E (one support part). Fig. 1 illustrates a configuration in which the tower-shaped weight 4 is supported at two points by the first suspension ring 43 and the second suspension ring 44A.

[0027] 4 is a diagram showing a two-point support pattern of the tower-shaped weight 4. In this embodiment, by providing a plurality of second suspension rings 44A-44E, the connection position between the wire 33B of the crane 3 and the tower-shaped weight 4 can be changed by appropriately selecting the second suspension ring to be connected to the wire 33B of the crane 3. Meanwhile, the wire 33A of the crane 3 is always connected to the first suspension ring 43 on the upper end surface 41A. Therefore, by appropriately selecting the second suspension ring to be connected to the wire 33B, the support position of the two-point support can be changed, and as a result, the inclination of the tower-shaped weight 4 suspended by the two wires 33A and 33B can be adjusted.

[0028] For example, as shown in Fig. 4(A), when the wire 33B is connected to the second second suspension ring 44B from the upper end surface 41A side, the inclination in the normal direction of the bottom surface of the bottom plate 42 and the inclination in the extension direction of the main body 41 can be made larger than when the wire 33B is connected to the first second suspension ring 44A shown in Fig. 1 etc. Similarly, as shown in Fig. 4(B), when the wire 33B is connected to the third second suspension ring 44C from the upper end surface 41A side, the inclination in the normal direction of the bottom surface of the bottom plate 42 and the inclination in the extension direction of the main body 41 can be made even larger than when the wire 33B is connected to the second second suspension ring 44B shown in Fig. 4(A). Similarly, as shown in Fig. 4(C), when wire 33B is connected to the fourth second suspension ring 44D from the upper end surface 41A side, the inclination of the normal direction of the bottom surface of bottom plate 42 and the inclination of the extension direction of main body 41 can be made even larger than when wire 33B is connected to the third second suspension ring 44C shown in Fig. 4(B). In other words, the more the second suspension ring connecting wire 33B is moved from the upper end surface 41A side to the bottom plate 42 side, the greater the inclination of the normal direction of the bottom surface of bottom plate 42 with respect to the horizontal direction and the inclination of the extension direction of main body 41 with respect to the horizontal direction can be made to increase stepwise.

[0029] By making it possible to adjust the inclination of the tower-shaped weight 4 in multiple stages by supporting it at two points in this manner, the hanging posture of the tower-shaped weight 4 can be made closer to the inclination angle of the guide member 6, making it easier to fit the tower-shaped weight 4 into the guide groove of the guide member 6.

[0030] As shown in Figures 1 and 2, in the rubble mound leveling device 1 of this embodiment, the inclination angle of the guide member 6 and the guide grooves 64A-64E can be adjusted by the jack 7 so that the bottom plate 42 of the tower-shaped weight 4 engaged with the guide grooves 64A-64E faces the flat surface of the foundation rubble mound 12 to be leveled. With the inclination angle maintained, the tower-shaped weight 4 is allowed to freely fall along the sliding direction using at least some of the multiple guide grooves 64A-64E, thereby leveling the flat surface with the bottom plate 42 of the tower-shaped weight 4.

[0031] In this embodiment, the guide member 6 is preferably installed on the floating body 5 connected to the crane ship 2. Generally, the crane 3 installed on the crane ship 2 has the rotating body 31 arranged at the end of the ship, which makes it easy to advance the jib 32 outboard, and is configured to efficiently perform crane work mainly performed outside the ship. For this reason, when the guide member 6 arranged below the rudders-type weight 4 suspended from the jib 32 is installed on the floating body 5 arranged outside the crane ship 2, it becomes easy to use the crane 3 of the existing crane ship 2, and versatility can be improved. In addition, the floating body 5 on which the guide member 6 is installed is preferably arranged floating on the water surface adjacent to the crane ship 2 and connected so that the relative positional relationship with the crane ship 2 can be kept constant. As a result, the relative positional relationship between the rudders-type weight 4 suspended from the crane 3 and the guide member 6 installed on the floating body 5 can also be kept constant, making it easy to engage the rudders-type weight 4 with the guide member 6.

[0032] As shown in Fig. 1 and Fig. 2, a pair of winches 8A, 8B are installed between the crane ship 2 and the floating body 5. Each winch 8A, 8B has a common configuration, and includes a drum 81 installed on the crane ship 2, a rope 82 wound around the drum 81 and pulled out, and a fixed end 83 installed on the floating body 5 to which the tip of the rope 82 is connected and fixed. The drum 81 can be rotated by a driving source (not shown), and the rope 82 can be wound or unwound depending on the amount of rotation of the drum 81, thereby adjusting the distance from the fixed end 83. Note that while only one winch 8A is shown in Fig. 1, the other winch 8B is arranged on the Y positive direction side of one winch 8A (the back side of the paper in Fig. 1) as shown in Fig. 2.

[0033] As shown in FIG. 2, it is preferable that the winches 8A, 8B are disposed at positions approximately equidistant from the center of the arrangement direction of the guide grooves 64A to 64E of the guide member 6. In the example of FIG. 2, the guide groove 64C is disposed at the center of the guide member 6, and the winches 8A, 8B are disposed at positions equidistant on both sides of the guide groove 64C in the arrangement direction (here, the Y direction). By disposing the pair of winches 8A, 8B in this manner, the relative positions of the float 5 and the guide member 6 with respect to the crane ship 2 can be easily adjusted around the rotation axis O of the crane 3, as shown by the arrow C in FIG. 2. This makes it possible to easily adjust the parallel direction of the multiple guide grooves 64A to 64E with respect to the crane ship 2 around the rotation axis O shown by the arrow C.

[0034] As a method of adjusting the parallel direction of the multiple guide grooves 64A-64E with respect to the crane ship 2 by the pair of winches 8A, 8B, there is, for example, a method of increasing the winding amount of the drum 81 of one winch on the side where it is desired to tilt the arrangement direction toward the crane ship 2 compared to the other winch. Alternatively, a method may be used in which a member having a relatively thin thickness in the X direction (for example, thinner than the bottom plate 42 of the rudders-type weight 4) is sandwiched in the gap between the crane ship 2 and the floating body 5 on the side opposite to the side where it is desired to tilt the arrangement direction toward the crane ship 2 with respect to the center of the arrangement direction (the position of the guide groove 64C in FIG. 2), and the drums 81 of the pair of winches 8A, 8B are rotated with the same driving force to wind up the rope 82.

[0035] In this way, the pair of winches 8A, 8B function as a parallel direction adjustment unit that can adjust the parallel direction of the multiple guide grooves 64A-64E relative to the crane ship 2. The riprap mound leveling device 1 of this embodiment is equipped with the pair of winches 8A, 8B as a parallel direction adjustment unit, and thereby can adjust the parallel direction of the multiple guide grooves 64A-64E while the crane ship 2 is anchored at one location on the water bottom 11. As a result, even if the positioning accuracy of the crane ship 2 is low, the parallel direction of the multiple guide grooves 64A-64E can be accurately positioned in a desired direction by adjusting the winches 8A, 8B, so that the guide grooves can be positioned easily and with high accuracy, and the work efficiency of the leveling work can be improved.

[0036] The configuration of the guide member 6 will be described in detail with reference to Fig. 5 in addition to Fig. 2. Fig. 5 is a diagram showing the bottom end surface and top end surface of the guide member 6 in Fig. 1. Fig. 5(A) shows a schematic shape of the bottom end surface side of the guide member 6 viewed from the X positive direction. Fig. 5(B) shows a schematic shape of the top end surface side of the guide member 6 viewed from the X negative direction.

[0037] 2 and 5, the guide member 6 is formed by combining a first frame 61, a second frame 62, and third frames 63A to 63F. The first frame 61 and the second frame 62 are rectangular columnar members of substantially the same shape, and are arranged in parallel with the same direction (here, the Y direction) as their longitudinal direction. The first frame 61 and the second frame 62 are also arranged such that their four longitudinal side surfaces face the same direction.

[0038] The six third frames 63A to 63F are rectangular column members of substantially the same shape, and are arranged in parallel with a direction perpendicular to the first frame 61 and the second frame 62 (here, the X direction) as the longitudinal direction. The third frames 63A to 63F are connected and fixed to the side surfaces of the first frame 61 and the second frame 62 in the longitudinal direction that are in the same plane. That is, the third frames 63A to 63F are installed in the longitudinal direction across the first frame 61 and the second frame 62. The six third frames 63A to 63F are arranged so that the intervals in the arrangement direction are substantially uniform. As shown by dotted lines in Figs. 5(A) and (B), the dimension of the gap between the third frames in the Y direction is larger than the main body 41 of the tower-shaped weight 4, and is formed to a size that allows the main body 41 to fit. As a result, the gaps in the Y direction between the six third frames 63A to 63F and the side surfaces of the first frame 61 and the second frame 62 arranged on the negative Z direction side of these gaps form the five guide grooves 64A to 64E described above in the guide member 6, each extending in the X direction and arranged in parallel in the Y direction.

[0039] As shown in FIG. 5(A), the second frame 62 is provided with a through hole 65 in the longitudinal direction. On the other hand, on both sides of the second frame 62 on the float 5 in the Y direction, a pair of bases 51A, 51B are provided at positions facing both end faces of the second frame in the Y direction. That is, the pair of bases 51A, 51B are installed so as to sandwich the second frame 62 from both sides in the Y direction. And, between these bases 51A, 51B, the rotation shaft 52 is fixedly installed passing through the through hole 65. Therefore, the guide member 6 is installed on the float 5 so as to be rotatable around the Y axis with respect to the float 5 with the rotation shaft 52 on the lower end side as the rotation center.

[0040] As shown in FIG. 5B, a pair of connecting shafts 66A, 66B are fixedly set on the first frame 61, protruding further in the longitudinal direction from both end faces in the longitudinal direction. Through holes 73 are provided in the telescopic parts 72 of the pair of jacks 7A, 7B, through which the connecting shafts 66A, 66B are rotatably inserted. Meanwhile, a pair of bases 53A, 53B are provided on both sides of the first frame 61 in the longitudinal direction on the floating body 5. The pair of bases 53A, 53B are disposed opposite the bases 71 of the pair of jacks 7A, 7B. Axles 54A, 54B protruding toward the bases 71 of the jacks 7A, 7B are fixedly installed on the pair of bases 53A, 53B, and the axles 54A, 54B are rotatably inserted into through holes 74 provided in the bases 71. Therefore, the guide member 6 is rotatably connected to the pair of jacks 7A, 7B via the upper end connecting shafts 66A, 66B around the Y axis, and the pair of jacks 7A, 7B are rotatably connected to the floating body 5 via shafts 54A, 54B and bases 53A, 53B around the Y axis.

[0041] 2 and 5, the guide member 6 can be operated to rotate about the lower end pivot shaft 52 as the center of rotation in response to the extension and contraction of the jack 7, so that the extension direction of the five guide grooves 64A-64E is inclined at any angle with respect to the horizontal and vertical directions. Also, by stopping the extension and contraction part 72 of the jack 7 at any length, the five guide grooves 64A-64E can be held at any inclination angle.

[0042] 2 and 5, the number of the guide grooves 64A to 64E is five, but the number is not limited to five. It is preferable to have a larger number of guide grooves 64A to 64E. This increases the area in which the leveling work can be performed while the crane ship 2 is anchored in one place on the bottom 11, improving work efficiency.

[0043] 2, 5, etc. is merely an example, and the structure of the guide member 6 is not limited to this example. The guide member 6 may have at least a plurality of guide grooves 64A-64E arranged in parallel, and may have a configuration in which the inclination direction of the guide grooves can be adjusted as desired. For example, instead of a structure in which a plurality of square timbers are assembled as in this embodiment, a shape that satisfies the above conditions may be formed by cutting a single member.

[0044] In addition, in this embodiment, a configuration in which the inclination angle of the guide member 6 is adjusted by a pair of jacks 7A, 7B has been exemplified, but elements other than the jacks 7A, 7B may be applied as long as they can arbitrarily adjust at least the inclination angle of the guide grooves 64A to 64E and maintain it at an arbitrary inclination angle.

[0045] 6 to 12, a procedure for a rubble mound leveling method using the rubble mound leveling device 1 according to this embodiment will be described. In this example, a case in which a slope 12B of a flat surface of a foundation rubble mound 12 underwater 10 is leveled will be described as an example.

[0046] Fig. 6 is a side view for explaining the first stage of the rubble mound leveling method. Fig. 7 is a plan view showing an example of the arrangement of tower-type weights 4 corresponding to each of guide grooves 64A to 64E by the rotation of crane 3.

[0047] In the first stage shown in Fig. 6, the tower-shaped weight 4 is placed on the guide member 6. First, the inclination angle of the guide member 6 is adjusted so that it matches the normal direction of the slope 12B after the smoothing process. Specifically, as shown by arrow D in Fig. 6, the extendable portion 72 of the jack 7 is extended to a length corresponding to the desired inclination angle. This causes the guide member 6 to rotate around the pivot shaft 52 as shown by arrow E in Fig. 6, and the guide member 6 is maintained at the desired inclination angle.

[0048] 6, the inclination angle is adjusted to be the largest with respect to the horizontal direction among the postures of the tower-shaped weight 4 by the multiple second suspension rings 44A to 44E. Therefore, the wire 33B selects and connects the uppermost second suspension ring 44A, and as a result, as described with reference to Figs. 1 and 4, the tower-shaped weight 4 is also suspended by being supported at two points in a posture with the largest inclination angle. This makes it possible to bring the inclination angle of the guide member 6 and the inclination posture of the tower-shaped weight 4 closer to each other, making it easier to fit the tower-shaped weight 4 into the guide groove of the guide member 6.

[0049] After the inclination angle of the guide member 6 is adjusted, the tower-shaped weight 4 suspended from the wires 33A and 33B of the crane 3 is lowered from above as shown by the arrow F in FIG. 6. At this time, as shown in FIG. 7, the position of the tower-shaped weight 4 in the Y direction is changed by the rotation of the rotating body 31 of the crane 3 about the rotation axis O. Therefore, the longitudinal direction of the body 41 of the tower-shaped weight 4 is inclined in a horizontal plane except for the central guide groove 64C with respect to the extension direction (X direction) of the guide grooves 64A to 64E of the guide member 6. In FIG. 7, five types of postures of the tower-shaped weight 4 when the crane 3 is operated to fit the tower-shaped weight 4 into the five guide grooves 64A to 64E are illustrated by thick dotted lines, thin dotted lines, and dashed dotted lines. Here, the explanation will be given by taking as an example a case where the tower-shaped weight 4 is installed in the guide groove 64A located at the leftmost position in FIG. 7.

[0050] Fig. 8 is a plan view for explaining the second stage of the riprap mound leveling method. Fig. 9 is a side view for explaining the second stage of the riprap mound leveling method.

[0051] 8 and 9, the orientation of the tower-shaped weight 4 is adjusted so that the longitudinal direction of the tower-shaped weight 4 coincides with the extension direction of the guide groove 64A, as shown by the arrow G in Fig. 8. For example, the bottom plate 42 of the tower-shaped weight 4 is moved in the Y positive direction to rotate the main body 41 around the wires 33A and 33B.

[0052] After the orientation of the tower-shaped weight 4 is adjusted in the X direction, the tower-shaped weight 4 is further lowered from the first-stage height position and engaged with the guide groove 64A of the guide member 6, as shown by the arrow H in Fig. 9. As a result, the bottom plate 42 of the tower-shaped weight 4 is positioned facing the slope 12B of the foundation rubble mound 12.

[0053] FIG. 10 is a side view for explaining the third stage of the rubble mound leveling method. In the third stage shown in FIG. 10, as shown by the arrow I, the tower-shaped weight 4 falls into the water 10 along the direction of the guide groove 64A and hits a part of the slope 12B of the foundation rubble mound 12. As shown in FIG. 10, when the bottom plate 42 of the tower-shaped weight 4 hits the slope 12B, it is preferable that a part of the upper end side of the main body 41 of the tower-shaped weight 4 remains in the guide groove 64A and maintains a connected state with the guide member 6. This makes it possible to more reliably maintain the movement direction of the tower-shaped weight 4 in agreement with the extension direction of the guide groove 64A, that is, to more reliably maintain a constant gradient of the falling direction of the tower-shaped weight 4, between the second stage shown in FIG. 9 and the third stage shown in FIG. 10.

[0054] Also, it is preferable to install a weight member according to the weight of the bottom plate 42 at least in a portion of the body 41 on the upper end surface 41A side from the center in the longitudinal direction of the body 41, such as near the upper end surface 41A of the body 41 of the tower-shaped weight 4. This allows the position of the center of gravity of the tower-shaped weight 4 to be adjusted to the center in the longitudinal direction of the body 41 or on the upper end surface 41A side from the center, so that the tower-shaped weight 4 can be more stably dropped along the extension direction of the guide groove 64A and the gradient of the dropping direction of the tower-shaped weight 4 can be more reliably maintained constant. This weight member may be separate from the tower-shaped weight 4 or may be formed integrally with the body 41 of the tower-shaped weight 4. Also, it is preferable that the weight of this weight member is equal to or greater than the weight of the bottom plate 42.

[0055] After the tower-shaped weight 4 hits the slope 12B of the foundation rubble mound 12, the crane 3 is operated and the tower-shaped weight 4 is again raised to the desired height, for example, above the guide member 6 as shown in Figure 6.

[0056] In the third stage, the bottom plate 42 of the tower-shaped weight 4 is brought into contact with the slope 12B along the guide groove 64A. If the contact is higher than the design tolerance (for example, if the contact part of the bottom plate 42 with the slope 12B is closer to the water surface than the desired position), fine adjustments may be made and the weight may be abutted again. The fine adjustments may be performed, for example, by slightly raising the jib 32 of the crane 3, winding the wire 33A connected to the first suspension ring 43 at the top of the tower, and floating the bottom plate 42 off the slope 12B. Then, the wires 33A and 33B are loosened again to slide the tower-shaped weight 4 and cause the bottom plate 42 to collide with the slope 12B, thereby approaching the design tolerance. This can be repeated until the tolerance is met.

[0057] FIG. 11 is a plan view for explaining the fourth stage of the rubble mound leveling method. In the fourth stage shown in FIG. 11, the crane 3 is moved by a swinging motion to a position immediately above the guide groove 64B (see FIG. 7) adjacent to the guide groove 64A used in the first to third stages. Then, as shown by an arrow J in FIG. 11, the direction of the tower-shaped weight 4 is adjusted so that the longitudinal direction of the tower-shaped weight 4 coincides with the extension direction of the guide groove 64B. After the direction of the tower-shaped weight 4 is adjusted in the X direction, the tower-shaped weight 4 is engaged with the guide groove 64B of the guide member 6. Then, as shown by an arrow K, the tower-shaped weight 4 falls into the water 10 along the direction of the guide groove 64B and hits a part of the slope 12B of the foundation rubble mound 12.

[0058] The procedure of the fourth stage is repeated for the remaining guide grooves 64C, 64D, and 64E, and the slope 12B is leveled using all the guide grooves of the guide member 6. In the present embodiment, the order of use of the guide grooves is exemplified as the order of use of the guide grooves, starting from the guide groove 64A on the most negative Y direction side, followed by the guide groove 64B, the guide groove 64C, the guide groove 64D, and the guide groove 64E, which are adjacent to each other in the positive Y direction side, but is not limited to this. As long as at least the guide member 6 is held at an inclination angle facing the slope 12B to be leveled, the multiple guide grooves 64A to 64E may be used in a different order to perform the leveling work. Furthermore, the leveling work may be performed using at least a part of the five guide grooves 64A to 64E.

[0059] As shown in FIG. 11, in this embodiment, the bottom plate 42 of the tower-shaped weight 4 is formed in a shape in which a part of the outer shape of the bottom plate 42 overlaps when the main body 41 is engaged with two adjacent guide grooves among the multiple guide grooves 64A to 64B. In FIG. 11, the tower-shaped weight 4 engaged with the guide groove 64A is illustrated by a dotted line, and the tower-shaped weight 4 engaged with the guide groove 64B adjacent to the guide groove 64A is illustrated by a solid line. In these two states of the tower-shaped weight 4, a part of the bottom plate 42 overlaps. In this embodiment, since the bottom plate 42 is square-shaped, it is preferable to arrange the pair of opposite sides of the square shape so that they face each other in the parallel direction of the multiple guide grooves 64A to 64E. In this configuration, if at least multiple adjacent guide grooves are used in the leveling work, the part to be pressed on the slope 12B to be leveled can also be overlapped.

[0060] FIG. 12 is a schematic diagram showing an example of a result of slope leveling in this embodiment. FIG. 12 shows the slope portions 13A-13E pressed by the bottom plate 42 in each guide groove when the slope 12B to be leveled is leveled using the tower-shaped weight 4 using five guide grooves 64A-64E while the inclination angle of the guide member 6 is kept constant. In this embodiment, the bottom plate 42 is square-shaped, so the leveled portions 13A-13E are also square-shaped. As described above, each guide groove 64A-64E is configured so that a part of the bottom plate 42 overlaps when the tower-shaped weight 4 is fitted into the adjacent guide groove. Therefore, as shown in FIG. 12, four overlapping portions 14A-14D exist between the leveled portions 13A-13E. Furthermore, in this embodiment, the multiple guide grooves 64A-64E of the guide member 6 are arranged in parallel in the Y direction. Therefore, if the inclination angle of the guide member 6 is constant, the positions of the smoothing portions 13A-13E formed by each guide groove 64A-64E can also be aligned along the Y direction, as shown in FIG. 12.

[0061] In this manner, in this embodiment, the smoothed portions 13A to 13E can be arranged in any linear direction (here, the Y direction) and can be partially overlapped. Therefore, when the smoothing work is performed using each guide groove 64 while the guide member 6 is installed in one place and the inclination angle is kept constant, the smoothed portions 13A to 13E can be formed without gaps in any linear direction (here, the Y direction) as shown in FIG. 12. This allows the smoothing work to be performed efficiently. For example, after the smoothing work shown in FIG. 12 is performed, if the inclination angle is changed while the installation position of the guide member 6 is maintained, a smoothed portion can be formed adjacent to the X positive direction side or the X negative direction side of the smoothed portions 13A to 13E shown in FIG. 12. By repeating this work, the entire slope 12B can be smoothed without waste.

[0062] Here, a comparative example to the above embodiment will be described with reference to Figures 13 and 14. Figure 13 is a diagram showing an example of a conventional riprap mound leveling device 100 according to the comparative example.

[0063] The rubble mound leveling device 100 includes a leveling weight 104 suspended from a wire 105 of a crane 3 of a crane ship 2 so as to be movable up and down. The leveling weight 104 is formed in an elongated shape, and one end 104A in the longitudinal direction is connected to the wire 105, whereby the other end 104B is installed facing vertically downward. Hereinafter, the end 104B of the leveling weight 104 may also be referred to as the "lower end 104B". A plane is formed at the lower end 104B, the normal direction of which is the longitudinal direction of the leveling weight 104. The rubble mound leveling device 100 operates the crane 3 to drop the leveling weight 104 from above downward toward the foundation rubble mound 12 in the water 10. This allows the lower end 104B of the leveling weight 104 to press against the top surface 12A of the foundation rubble mound 12, making the top surface 12A flat and level.

[0064] The rubble mound leveling device 100 of the comparative example further includes a slope leveling member 106. The slope leveling member 106 is attached to the lower end 104B of the leveling weight 104 when in use. When the slope leveling member 106 is attached to the lower end 104B of the leveling weight 104, as shown by the arrow L in Fig. 13, it is dropped from above onto the slope 12B of the foundation rubble mound 12 below, thereby pressing against the slope 12B of the foundation rubble mound 12 and leveling the slope 12B into an inclined surface.

[0065] Fig. 14 is a schematic diagram showing an example of a slope leveling result in a comparative example. In the comparative example, as in the above embodiment, a case is considered in which the position of the leveling weight 104 is changed to perform leveling work while the crane ship 2 is parked at a predetermined position on the water bottom 11. Since the configuration of the crane 3 in the comparative example is the same as in the above embodiment, the position of the leveling weight 104 is arranged in an arc around the rotation axis O of the crane 3, as in the case described with reference to Fig. 7.

[0066] In the comparative example, the leveling weight 104 is dropped vertically downward from a state where it is positioned by the crane 3, and the dropped portion is leveled. Here, in order to easily correspond to the above embodiment, the leveling work is performed in the comparative example using the leveling weight 104 at five locations at approximately equal intervals along the rotation direction of the crane 3. The lower end surface of the leveling weight 104 is square like the bottom plate 42 in the above embodiment. At this time, as shown in FIG. 14, the five square-shaped leveled portions 113A to 113E formed by the leveling weight 104 at each of the five positions are not aligned in the horizontal direction (Y direction) but are aligned in an arc along the rotation direction of the crane 3.

[0067] In this way, in the conventional rubble mound leveling device 100 according to the comparative example, the leveling parts 113A-113E cannot be arranged in any linear direction with respect to the flat surface of the foundation rubble mound 12 to be leveled. Also, when performing leveling work by shifting in the X direction from the leveling part shown in Fig. 14, highly accurate positioning is required, such as adjusting the inclination angle of the jib 32 of the crane 3 or changing the mooring position of the crane ship 2. For this reason, the comparative example is considered to be inefficient in leveling the flat surface of the foundation rubble mound to be leveled without gaps.

[0068] 15 is a diagram showing an example of application of the rubble mound leveling device 1 according to this embodiment to leveling work of the top surface 12A. In the above embodiment, the rubble mound leveling device 1 according to this embodiment is configured to use the slope 12B as the flat surface to be leveled, but it can also be applied to the top surface 12A.

[0069] For example, as shown by arrow M in Figure 15, by further extending the extendable portion 72 of the jack 7 from the state shown in Figure 6, the guide member 6 can be rotated to a substantially right angle with respect to the floating body 5 as shown by arrow M. In other words, the inclination angle of the guide member 6 with respect to the horizontal plane can be set to approximately 90 degrees. At this time, the inclination angle of each of the guide grooves 64A-64E of the guide member 6 also becomes approximately 90 degrees.

[0070] In this way, the tower-shaped weight 4 is fitted to the guide member 6 whose inclination angle has been rotated to approximately a right angle. At this time, the position of the floating body 5 above the water surface is positioned so that the bottom plate 42 of the tower-shaped weight 4 fitted to the guide member 6 is located directly above the top surface 12A of the foundation rubble mound. As a result, when the tower-shaped weight 4 is dropped into the water 10 along the direction of the guide groove of the guide member 6 (i.e., the vertical direction), the bottom plate 42 of the tower-shaped weight 4 will abut against part of the top surface 12A of the foundation rubble mound 12 as shown by arrow Q, and the abutted part can be leveled.

[0071] In the configuration of FIG. 15, it is preferable to provide a second suspension ring 44F at the corner between the upper end surface 41A and the side surface 41C of the tower-shaped weight 4. In the posture of the tower-shaped weight 4 shown in FIG. 15, the second suspension ring 44F can be at almost the same height as the first suspension ring 43. Therefore, by connecting the wire 33B to the second suspension ring 44F, the tower-shaped weight 4 can be suspended in a posture in which the longitudinal direction is closer to the vertical direction than when the wire 33B is connected to the second suspension ring 44A illustrated in FIG. 1, FIG. 6, etc. As a result, even in the configuration of FIG. 15, the suspension posture of the tower-shaped weight 4 can be closer to the inclination angle of the guide member 6, making it easier to fit the tower-shaped weight 4 into the guide groove of the guide member 6.

[0072] The effect of this embodiment will be described. The rubble mound leveling device 1 according to this embodiment is for leveling the flat surface (top surface 12A, slope 12B) of a foundation rubble mound 12 underwater 10. The rubble mound leveling device 1 includes a tower-shaped weight 4 having a longitudinal body 41 and a square-shaped bottom plate 42 provided at the lower end of the body 41 and larger in cross-sectional area than the body 41, a guide member 6 having a plurality of guide grooves 64A-64E into which the body 41 of the tower-shaped weight 4 is engaged so as to be slidable in the longitudinal direction, the plurality of guide grooves 64A-64E being arranged in parallel in one direction (Y direction) perpendicular to the sliding direction of the body 41, and a jack 7 for adjusting the inclination angle of the guide grooves 64A-64E of the guide member 6. The rubble mound leveling device 1 maintains a state in which the inclination angle of the guide member 6 is adjusted by the jack 7 so that the bottom plate 42 of the tower-shaped weight 4 engaged with the guide grooves 64A-64E faces the flat surface of the foundation rubble mound 12 to be leveled. Then, with the inclination angle maintained, the tower-shaped weight 4 is allowed to freely fall along the sliding direction using the multiple guide grooves 64A-64E. As a result, the bottom plate 42 of the tower-shaped weight 4 hits the flat surface to be leveled, and the bottom plate 42 levels the flat surface.

[0073] In this embodiment, as described with reference to Figures 6 to 11, while the inclination angle of the guide member 6 is held at a predetermined angle, the planar leveling work is performed by the tower-shaped weight 4, sequentially using the multiple guide grooves 64A-64E arranged in parallel in one direction on the guide member 6. As a result, by adjusting the inclination angle of the guide member 6 so that it faces perpendicular to the plane of the foundation rubble mound 12 to be leveled (i.e., the extension direction of the guide grooves 64A-64E and the normal direction of the plane are the same direction), it is possible to easily and reliably level the plane to be leveled from the perpendicular direction by the bottom plate 42 of the tower-shaped weight 4. As described with reference to Fig. 12, by using a plurality of guide grooves 64A-64E, the tower-shaped weight 4 can be abutted against the flat surface to be leveled at the same inclination angle from different positions in the parallel direction of the guide grooves, so that the leveled portions 13A-13E of the flat surface to be leveled pressed by the bottom plate 42 of the tower-shaped weight 4 can be formed uniformly without gaps in any linear direction (Y direction here). Furthermore, by changing the inclination angle while maintaining the installation position of the guide member 6, it is possible to form leveled portions adjacent to the X positive direction side or X negative direction side of the leveled portions 13A-13E shown in Fig. 12. By repeating this operation, the entire flat surface to be leveled can be leveled without waste.

[0074] In addition, when changing the position of the tower-shaped weight 4 in the Y direction, it is necessary to rotate the crane 3 around the rotation axis O. Therefore, as described with reference to FIG. 7, the longitudinal direction of the tower-shaped weight 4 suspended from the crane 3 changes from the direction of the slope 12B to be leveled. In this embodiment, the guide grooves 64A-64E of the guide member 6 are arranged in parallel in the Y direction, so that even if the tower-shaped weight 4 is in a position where its longitudinal direction does not directly face the slope 12B by rotating the crane 3, as described with reference to FIG. 8, the longitudinal direction can be directly faced to the slope 12B by adjusting the orientation of the tower-shaped weight 4 to match the extension direction of the guide groove and fitting it into the guide groove. As a result, the rubble mound leveling device 1 of this embodiment can easily and accurately perform leveling work on a plane wider than the lower end surface (i.e., the bottom plate 42) of the tower-shaped weight 4 for leveling in the foundation rubble mound 12.

[0075] In the rubble mound leveling device 1 of this embodiment, the tower-shaped weight 4 is supported at two points. More specifically, the two-point support is achieved using the first suspension ring 43 and any one of the second suspension rings 44A to 44E. A plurality of the second suspension rings 44A to 44E, which are one of the support parts of the two-point support, are provided along the longitudinal direction of the main body 41 of the tower-shaped weight 4.

[0076] 4 and the like, by changing the second suspension rings 44A-44E that connect the wire 33B, the support position of the two-point support can be changed, and as a result, the inclination of the tower-shaped weight 4 suspended by the two wires 33A, 33B can be adjusted to any angle. This allows the suspension posture of the tower-shaped weight 4 to be closer to the inclination angle of the guide member 6, making it easier to fit the tower-shaped weight 4 into the guide grooves 64A-64E of the guide member 6 and improving work efficiency.

[0077] Fig. 16 is a perspective view showing a modified example of the guide member. As shown in Fig. 16, in the guide member 6A according to the modified example, the height dimension in the Z direction of each of the third frames 63A to 63F is formed to be larger than the main body 41 of the tower-shaped weight 4. This allows the depth dimension in the Z direction of each of the guide grooves 64A to 64E to be larger than the main body 41 of the tower-shaped weight 4, so that a part of the main body 41 (particularly the side surface 41C) does not protrude from each of the guide grooves 64A to 64E in the Z direction. In other words, when viewed from the extension direction of the guide grooves 64A to 64E (X direction in Fig. 16), the entire main body 41 of the tower-shaped weight 4 can be accommodated inside the guide grooves 64A to 64E.

[0078] In the guide member 6A according to the modification, as shown in Fig. 16, a plurality of pairs of gradient retaining members 67A-67E are provided on the upper surface (surface substantially parallel to the side surface 41C of the main body 41) facing the Z positive direction of each of the third frames 63A-63F, which extends toward the center in the Y direction in the guide grooves 64A-64E. The plurality of pairs of gradient retaining members 67A-67E are installed so as to overlap with the upper openings on the Z positive direction side of the guide grooves 64A-64E, respectively. The gradient retaining members 67A-67E are L-shaped plate-like members that protrude in the Z positive direction from the upper surface of each of the third frames 63A-63F when viewed from the extending direction of the guide grooves 64A-64E (X direction in Fig. 16), and are then bent at a right angle to extend toward the center in the Y direction in the guide grooves 64A-64E. That is, when viewed from the Z direction, the gradient retaining members 67A to 67E are disposed on the guide grooves 64A to 64E.

[0079] By providing such gradient retaining members 67A-67E in each of the guide grooves 64A-64E, as described with reference to Fig. 10, when the tower-shaped weight 4 is placed in the guide member 6A and dropped into water, the main body 41 of the tower-shaped weight 4 can be prevented from protruding from the guide grooves 64A-64E in the Z positive direction. In other words, the gradient retaining members 67A-67E restrict the falling direction of the tower-shaped weight 4 engaged in the guide grooves 64A-64E from deviating in the up-down direction from the extending direction of the guide grooves 64A-64E. As a result, the guide member 6A according to the modified example can prevent the falling direction of the tower-shaped weight 4 from changing during the fall, and can keep the gradient of the falling direction of the tower-shaped weight 4 constant.

[0080] In addition, in the guide member 6A according to the modified example, the gradient retaining members 67A to 67E can forcibly prevent the change in the falling direction of the tower-shaped weight 4, so that it is not necessary to adjust the longitudinal center of gravity of the tower-shaped weight 4 by, for example, installing a weight member near the upper end surface 41A of the main body 41 of the tower-shaped weight 4 as described in the above embodiment. Therefore, the adjustment of the center of gravity of the tower-shaped weight 4 can be omitted, so that the moving direction of the tower-shaped weight 4 can be kept consistent with the extending direction of the guide groove 64A between the second stage shown in Fig. 9 and the third stage shown in Fig. 10, that is, it is easier to keep the gradient of the falling direction of the tower-shaped weight 4 constant. This makes it easier to carry out the leveling work.

[0081] In addition, it is preferable that the gradient retaining members 67A-67E are installed so that, for example, the portions protruding in the Z positive direction from the upper surfaces of the third frames 63A-63F can rotate about the Z axis with respect to the third frames 63A-63F. As a result, when inserting the main body 41 of the tower-shaped weight 4 from above into the guide grooves 64A-64E, the gradient retaining members 67A-67E can be rotated by about 90 degrees as shown by the arrow R in Fig. 16 to move the main body 41 out of the guide grooves 64A-64E, so that the main body 41 can be inserted into the guide grooves 64A-64E without being obstructed by the gradient retaining members 67A-67E.

[0082] Furthermore, the gradient retaining members 67A-67E may have a shape other than the L-shaped plate-like member shown in Fig. 16, so long as they are arranged to extend at least toward the center of the width direction (Y direction) of the guide grooves 64A-64E and can rotate from this arrangement around the Z axis in the longitudinal direction (X direction) of the third frames 63A-63F. For example, they may be rod or square members extending in one direction, one end of which is rotatably connected to the third frames 63A-63F.

[0083] The present embodiment has been described above with reference to specific examples. However, the present disclosure is not limited to these specific examples. Any design modifications made by a person skilled in the art to these specific examples are also included within the scope of the present disclosure as long as they have the features of the present disclosure. The elements of each of the above-mentioned specific examples and their arrangements, conditions, shapes, etc. are not limited to those exemplified and can be changed as appropriate. The combination of each of the elements of each of the above-mentioned specific examples can be changed as appropriate as long as no technical contradiction occurs.

[0084] In the above embodiment, the bottom plate 42 of the tower-shaped weight 4 is shaped like a square, but any other rectangular shape is acceptable. The shape of the bottom plate 42 may be other than rectangular, and may be a polygonal shape such as a hexagon or an octagon, or may be a circle or a shape combining straight lines and curves. In short, it is sufficient that the shape of the bottom plate 42 allows parts of the bottom plate 42 to overlap when the main body 41 of the tower-shaped weight 4 is placed in adjacent guide grooves among the multiple guide grooves 64A to 64E.

[0085] In addition, in the above embodiment, a configuration is exemplified in which the float 5 on which the guide member 6 is installed is connected to the crane ship 2 by winches 8A and 8B, but it is sufficient that the relative positions of the float 5 and the crane ship 2 are at least maintained, and the float 5 may be integrated with the crane ship 2 by, for example, bolt connection, etc.

[0086] In the above embodiment, the inclination angle of the guide member 6 is adjusted by using the jack 7, but other elements capable of fulfilling the function of the inclination adjustment unit other than the jack 7 may be used. For example, a configuration in which an earth retaining material is sandwiched between the guide member 6 and the upper surface of the floating body 5 to adjust the inclination angle may be used. [Explanation of symbols]

[0087] 1 Rubble mound leveling device 2 Hoist ship 3. Crane 4. Tower-shaped weight 41 Main unit 42 Bottom plate 44, 44A~44E Second hanging ring (one of the support parts) 5 Floating Body 6 Guide member 64A~64E Guide groove 7 Jack (tilt adjustment part) 8A, 8B Winch (parallel direction adjustment part) 12 Foundation rubble mound 12A Top surface (plane) 12B Slope (flat) 67A~67E Gradient retaining members

Claims

1. A rubble mound leveling device for leveling the plane of an underwater foundation rubble mound, comprising: A tower-shaped weight having a longitudinal body and a polygonal bottom plate provided at a lower end of the body and having a cross-sectional area larger than that of the body; A guide member having a plurality of guide grooves into which the body of the tower-shaped weight is engaged so as to be slidable in a longitudinal direction, the plurality of guide grooves being arranged in parallel in one direction intersecting with the sliding direction of the body; an inclination adjustment unit that adjusts the inclination angle of the guide groove of the guide member; Equipped with the tilt angle is adjusted by the tilt adjustment unit so that the bottom plate of the tower-shaped weight engaged with the guide groove faces the flat surface to be leveled, and the tower-shaped weight is allowed to freely fall along the sliding direction using at least a part of the guide grooves to level the flat surface with the bottom plate; Rubble mound leveling device.

2. The tower-shaped weight is supported at two points.

2. The rubble mound leveling device of claim 1.

3. A plurality of support portions of the two-point support are provided along the longitudinal direction of the main body.

3. A rubble mound leveling device as claimed in claim 2.

4. the bottom plate is formed in a shape such that when the main body is engaged with two adjacent guide grooves among the plurality of guide grooves, a part of an outer shape of the bottom plate overlaps with the guide grooves.

2. The rubble mound leveling device of claim 1.

5. The bottom plate is rectangular, and a pair of opposite sides of the rectangular shape are arranged to face each other in a direction in which the guide grooves are arranged side by side. A rubble mound leveling device as claimed in claim 4.

6. A crane for suspending the tower-type weight is installed on a crane ship, and the guide member is installed on a floating body connected to the crane ship.

2. The rubble mound leveling device of claim 1.

7. A parallel direction adjustment unit is provided that can adjust the parallel direction of the plurality of guide grooves relative to the crane ship. A rubble mound leveling device as claimed in claim 6.

8. The plane is a slope of the foundation rubble mound.

2. The rubble mound leveling device of claim 1.

9. The guide member has a gradient retaining member that restricts the falling direction of the tower-shaped weight engaged with the guide groove from deviating in the vertical direction from the extending direction of the guide groove.

2. The rubble mound leveling device of claim 1.

10. A tower-shaped weight having a longitudinal body and a polygonal bottom plate provided at a lower end of the body and having a cross-sectional area larger than that of the body; A guide member having a plurality of guide grooves into which the body of the tower-shaped weight is engaged so as to be slidable in a longitudinal direction, the plurality of guide grooves being arranged in parallel in one direction intersecting with the sliding direction of the body; an inclination adjustment unit that adjusts the inclination angle of the guide groove of the guide member; A rubble mound leveling method for leveling a plane of an underwater foundation rubble mound using a rubble mound leveling device comprising: an adjustment step of adjusting the inclination angle of the guide member by the inclination adjustment unit so that the bottom plate of the tower-shaped weight in a state where it is fitted into the guide groove faces the plane to be leveled; a first leveling step in which the tower-shaped weight is placed in one of the plurality of guide grooves while maintaining the inclination angle adjusted in the adjustment step, and is allowed to fall freely along the sliding direction to level the plane with the bottom plate; a second leveling step in which, after the first leveling step, the tower-shaped weight is placed in another guide groove other than the one guide groove among the plurality of guide grooves while maintaining the inclination angle adjusted in the adjustment step, and the tower-shaped weight is allowed to fall freely along the sliding direction to level the plane with the bottom plate; Including, When there are a plurality of the other guide grooves, the second leveling step is repeated using at least some of the other guide grooves. How to level a rubble mound.

Images