JP6511296B2 - Method of leveling in water and attachment for leveling in water - Google Patents

Description

  The present invention relates to an underwater ground leveling method and an underwater ground leveling attachment, more specifically, using a grab bucket equipped with an attachment as a weight for free fall, without requiring a large number of man-hours, the slope surface The present invention relates to an underwater ground leveling method and an underwater ground leveling attachment which can be smoothed smoothly.

  As a construction method of leveling the underwater ground, such as underwater rubbish leveling work, the ground is pressed by repeating the work of letting the weight lifted by the crane boom of the work ship fall freely, and the surface of the underwater ground is specified. A method of leveling the shape is known (see, for example, Patent Document 1 and FIG. 2).

  In this conventional method, since the surface of the underwater ground is pressed by the flat lower surface of the freely dropped weight, it is easy to perform the horizontal work of the top end of the rubble foundation. However, it is difficult to even out the slope smoothly, and if it is to be smoothed, a large number of man-hours are required. For example, finishing of the slopes could not but rely on the diver's underwater finishing manual work.

JP 2003-184090 A

  SUMMARY OF THE INVENTION An object of the present invention is to use a grab bucket equipped with an attachment as a free fall weight, and a method and apparatus for leveling an underwater ground which can smooth the slope smoothly without requiring a large number of steps. It is to provide a storage attachment.

In order to achieve the above object, according to the method of the present invention for leveling underwater ground, a weight suspended from a crane is allowed to freely fall to press the underwater ground, thereby leveling the surface of the underwater ground into a predetermined shape. In the leveling method, a grab bucket equipped with a removable underwater ground leveling attachment at its lower end is used as the weight, and a pair of shells of the grab bucket suspended from a crane are opened. The weight may be freely dropped while the lower surface of the attachment attached to the grab bucket in this state is inclined with respect to the horizontal.
Another method of leveling an underwater ground according to the present invention is a method of leveling an underwater ground according to the present invention, wherein a weight suspended from a crane is allowed to freely fall to press the underwater ground. Using the grab bucket fitted with the removable underwater ground leveling attachment at the lower end as the weight, and closing the pair of shells of the grab bucket suspended from the crane, and A state in which a weight adjusting member held by closing the pair of shells is accommodated in the inside of the shell, and the lower surface of the attachment attached to the grab bucket in this state is inclined with respect to the horizontal And the free fall of the weight.

The underwater ground leveling attachment of the present invention is an underwater ground leveling attachment which is detachably mounted on a grab bucket, and a mounting portion which is detachably connected to the lower end portion of the grab bucket, and the mounting portion And a pressing portion disposed below the subsurface to press the surface of the underwater ground, and the mounting portion is detachably connected to the lower end portion of the grab bucket with the pair of shells of the grab bucket opened. The lower surface of the pressing portion is configured to be inclined with respect to the horizontal when mounted on the grab bucket suspended from a crane via the mounting portion.

According to the present invention, the grab bucket equipped with the ground leveling attachment is used as a weight, and the free fall is performed while the lower surface of the attachment mounted on the grab bucket suspended from the crane is inclined to the horizontal. Then, it can be pressed from the direction perpendicular to the slope. Therefore, it is possible to finish the slope more smoothly than the conventional method, and it does not require a large number of man-hours.

The lower surface of the attachment may be formed into an inclined surface, and the grab bucket on which the attachment is attached may be suspended in a neutral state. In this configuration, an inadvertent load is not generated on the suspended grab bucket or the suspension wire. In addition, the inclination angle of the lower surface of the attachment when suspended from a crane can be easily set in a wide range. Here, this neutral state means a state in which the grab bucket can be suspended substantially without tilting as in the case where only the grab bucket is suspended without attaching the attachment.

The lower surface of the attachment may be formed in a horizontal plane, and the grab bucket on which the attachment is attached may be suspended at an angle with respect to the neutral state. With this configuration, since the attachment can be stably placed on a flat surface, the work of attaching the attachment to the grab bucket becomes easy.

The lower surface of the attachment may be formed into an inclined surface, and the glove bucket on which the attachment is attached may be suspended at an angle with respect to the neutral state. With this configuration, it is also possible to further increase the inclination angle of the lower surface of the attachment when suspended from the crane.

The attachment may be mounted with the pair of shells of the grab bucket closed. In this case, the attachment can be mounted in contact with the outer walls of the pair of shells, so that the attachment can be mounted in a stable state by the grab bucket. In addition, since the size of the attachment can be made smaller than when the pair of shells are mounted in the open state, the resistance of the water is reduced when the attachment drops naturally into water, and the underwater ground can be pressed more strongly. It will be possible.

The attachment may also be mounted with the pair of shells of the grab bucket open. In this case, the size of the attachment can be easily increased as compared with the case where the pair of shells are mounted in a closed state, so that a wider range of underwater ground can be pressed by one free fall. Further, since the grab bucket is originally designed on the assumption that it collides with the ground with the pair of shells open, an unexpected load is unlikely to occur on the grab bucket.

  The weight adjusting member may be accommodated in the inside of the pair of shells of the grab bucket to be in a closed state. Thereby, the pressing force to the ground by a weight can be enlarged.

  The attachment portion may be provided with an accommodating portion, and the weight adjusting member may be accommodated in the accommodating portion. This makes it possible to increase the pressure on the ground.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which illustrates the attachment for underwater ground leveling of this invention, the grab bucket with which this attachment is mounted | worn, and an installation stand by a plain view. It is explanatory drawing which illustrates the attachment of FIG. 1, a grab bucket, and an installation stand in a side view. It is explanatory drawing which illustrates the state which attached the attachment to the grab bucket of FIG. 2 which accommodated the weight adjustment member in the inside of a pair of shells in a side view. It is explanatory drawing which illustrates the state which suspended the attachment and grab bucket of FIG. 3 by a plain view. The leveling method of the underwater ground of this invention WHEREIN: It is explanatory drawing which illustrates the state which presses and is leveling the underwater ground with a weight. The leveling method of the underwater ground of this invention WHEREIN: It is explanatory drawing which illustrates the state which is dragging the weight and leveling the ups and downs of the underwater ground. It is explanatory drawing which illustrates the state which suspended the grab bucket equipped with the underwater ground leveling attachment of another embodiment by the side view. It is explanatory drawing which illustrates the grab bucket equipped with the underwater ground leveling attachment of another embodiment by a side view. It is explanatory drawing which illustrates the grab bucket equipped with the underwater ground leveling attachment of another embodiment by a side view. It is explanatory drawing which illustrates the state which suspended the grab bucket which mounted | worn the underwater ground leveling attachment of another embodiment with a side view. It is explanatory drawing which illustrates the state which suspended the grab bucket which mounted | worn the underwater ground leveling attachment of another embodiment with a side view. It is explanatory drawing which illustrates the state which suspended the grab bucket which mounted | worn the underwater ground leveling attachment of another embodiment with a side view.

  Hereinafter, the method of leveling the underwater ground and the attachment for leveling the underwater according to the present invention will be described based on the embodiments shown in the drawings.

  The underwater ground leveling attachment 3 (hereinafter, attachment 3) of the present invention illustrated in FIGS. 1 to 4 is mounted on a grab bucket 2 (hereinafter, bucket 2) and used as a weight 1 together with the bucket 2. The X direction in the drawing indicates the width direction of the glove bucket 2, the Y direction indicates the depth direction of the glove bucket 2 (opening and closing directions of the pair of shells 2a), and the Z direction indicates the height direction of the glove bucket 2. The center of gravity of the weight 1 is indicated by G1, the center of gravity of the bucket 2 by G2, and the center of gravity of the attachment 3 by G3. A vertical line A and a horizontal line H passing through the center of the pin 2f, which is the rotational center of the bucket 2, are pivotally supported by the upper block 2b, indicated by alternate long and short dashed lines, and a virtual straight line B passing through the center of the pin 2f and the center of gravity G2 It shows. In FIGS. 1 and 7, since the vertical line A and the imaginary straight line B overlap with each other, they are shown by a one-dot chain line.

  The bucket 2 used in the present invention is a common grab bucket conventionally used for chewing. An upper block 2 b is fixed at the center in the width direction of the upper end surface of the bucket 2 illustrated in this embodiment. A U-shaped part is rotatably connected to the upper block 2b by a pin 2f in a front view to which the suspension wire 2c is connected. The bucket 2 suspended about the pin 2 f rotates in the width direction. An open / close sheave 2d is disposed below the upper block 2b. The open / close sheave 2d is suspended vertically movable by the open / close wire 2e.

FIG. 1 illustrates the bucket 2 suspended in a neutral state. In this neutral state, as shown in FIG. 1, the bucket 2 is suspended without being substantially inclined, and is inclined within a range of ± 5 ° in the width direction of the bucket 2 about the pin 2 f It also includes the state.

  The upper end portions of the pair of shells 2a are rotatably connected to the lower end of the opening and closing sheave 2d via a connecting member 2g. By the downward movement of the open / close sheave 2d, the shells 2a rotate around the rotation axes at both ends in the Y direction, and the pair of shells 2a is opened. The pair of shells 2a is closed by the upward movement of the open / close sheave 2d.

  The attachment 3 includes an attachment portion 4 detachably connected to the lower end portion of the bucket 2 and a pressing portion 5 disposed below the attachment portion 4 and pressing the surface of the underwater ground.

  The attachment portion 4 includes an intermediate member 4 a interposed between the pair of shells 2 a and the pressing portion 5 and a connection member 4 b for connecting the attachment 3 to the bucket 2.

The intermediary member 4a is a member that increases the contact area between the pair of shells 2a and the pressing portion 5 in order to stably fix the pair. The intermediary member 4a may be shaped according to the state of the pair of shells 2a when the attachment 3 is attached. For example, in the case where the attachment 3 is attached with the pair of shells 2a closed as in this embodiment, the upper end of the intermediate member 4a has a shape matching the arc shape of the lower end of the outer wall of the pair of shells 2a. Do. Further, it is preferable to form the intermediate member 4a larger than the dimensions in the X direction and the Y direction of the pair of shells 2a, and wrap the entire periphery of the pair of shells 2a with the intermediate member 4a.

  As the connecting member 4b, for example, a metal wire having hooks at both ends can be used. The configuration, arrangement, and number of the connection members 4b can be determined as appropriate. In addition, an anchor or the like for connecting and fixing the connection member 4b can be provided as appropriate in the bucket 2.

  The pressing unit 5 is, for example, a plate-like member made of metal. The dimensions and shape of the pressing portion 5, the inclination angle provided on the lower surface, the weight, and the position of the center of gravity are appropriately selected according to the angle and area to be pressed, the pressure to be obtained, and the like.

In this embodiment, a square prism made of iron whose lower surface is formed in an inclined surface is used as the pressing portion 5. The inclined surface means that when the attachment 3 is attached to the bucket 2 whose inclination is fixed in the neutral state, the lower surface of the attachment 3 (the pressing portion 5) is inclined with respect to the horizontal plane. Specifically, the lower surface of the pressing portion 5 is set to be inclined at an angle α with respect to the horizontal in front view. The angle α is set to a predetermined angle, for example, in the range of up to 45 ° or in the range of up to 30 °. The dimensions in the X direction and the Y direction of the pressing portion 5 are substantially the same as the maximum dimensions in the X direction and the Y direction when the pair of shells 2a of the bucket 2 is closed.

  A weight adjusting member 7 is accommodated inside the pair of shells 2a in the closed state. The weight adjusting member 7 is a member used to increase and adjust the weight of the weight 1. As the weight adjusting member 7, stone, soil, etc. can be used. Although the weight adjusting member 7 is used in this embodiment, it may be used as needed, and its use is optional.

  The method of leveling the slope S of the underwater ground using this attachment 3 will be described below.

  First, a stone, soil, etc. in the vicinity of the construction site are scooped a predetermined amount by the bucket 2 as the weight adjusting member 7 and housed in the pair of shells 2a and closed. In the case of forming a mound (ground) in the water by rubbish, it is convenient to use the rubbish as the weight adjusting member 7 because it is not necessary to prepare the weight adjusting member 7 specially.

  Next, the lower end of the bucket 2 moved downward is placed in contact with the predetermined position of the upper end of the intermediate member 4a. Since the bucket 2 can be moved to any position by the operation of the crane 8, the placement on the intermediate member 4a can be easily performed. Install the attachment 3 on the installation table 9 formed in accordance with the inclined lower surface of the attachment 3 and make the upper end of the intermediate member 4 a parallel to the lower end of the bucket 2 to perform the operation more easily Can. And the bucket 2 and the attachment 3 are connected by the connection member 4b, for example, the width direction center of both is made to correspond, and the bucket 2 and the attachment 3 are integrated.

  The bucket 2 (weight 1) on which the attachment 3 is mounted is suspended by a crane 8 mounted on a work ship or the like using a lifting wire 2c. At this time, the center of gravity G1 of the weight 1 is on the vertical line A. As shown in FIG. 1, when the attachment 3 is mounted on the bucket 2 with the center of gravity G3 shifted with respect to the imaginary straight line B, the weight 1 has an angle in the width direction centering on the pin 2f as shown in FIG. Rotate by β. Therefore, the inclination angle with respect to the horizontal surface of the lower surface of the suspended weight 1 is α + β.

  When the deviation between the center of gravity G3 of the attachment 3 and the imaginary straight line B is small and the angle β is in the range of ± 5 °, the bucket 2 is suspended in a neutral state. Therefore, if the attachment 3 is mounted on the bucket 2 with the center of gravity G3 positioned on the imaginary straight line B, the bucket 2 will be suspended without being inclined in the width direction. On the other hand, when the deviation between the center of gravity G3 of the attachment 3 and the imaginary straight line B is large and the angle β is out of the range of ± 5 °, the bucket 2 is suspended with respect to the neutral state.

  Then, with the lower surface of the attachment 3 attached to the bucket 2 being inclined with respect to the horizontal, the weight 1 is freely dropped as illustrated in FIG. 5. The lower surface of the pressing portion 5 of the freely dropped weight 1 (attachment 3) presses the slope S. The pressed slope S is leveled along the lower surface of the pressing portion 5. Therefore, the surface of the slope S is leveled so as to approach the inclination angle of the lower surface of the pressing portion 5. The work of lifting and freely dropping the weight 1 is repeated a plurality of times, and by gradually shifting and changing the pressing position, the slope surface S is evenly leveled.

  By changing or adjusting at least one of the type (density) and the amount of the weight adjusting member 7 to be accommodated, the pressing force on the underwater ground by the freely dropped weight 1 can be set to a desired pressing force. When the weight adjusting member 7 is not necessary, the insides of the pair of shells 2a are empty. The pressing force can also be changed by adjusting the falling height of the weight 1.

  As described above, according to the present invention, the lower surface of the attachment 3 can be freely dropped while being inclined with respect to the horizontal, and can be pressed from the vertical direction with respect to the slope S. Therefore, the slope S can be finished more smoothly by reducing the level difference compared to the conventional method. Moreover, since the attachment work of the attachment 3 may be performed, a large number of man-hours are not required.

  Moreover, since the bucket 2 to which the attachment 3 is attached can be used as the weight 1, it is not necessary to separately prepare the bucket 2 and the weight 1. By mounting the attachment 3 on the work boat on which the bucket 2 is mounted, after performing scraping work and the like using the bucket 2, the attachment 3 is continuously mounted on the bucket 2 to perform work of leveling the underwater ground be able to.

  In this embodiment, since the bucket 2 to which the attachment 3 is attached is suspended in a neutral state, no careless load is generated on the suspended bucket 2 and the suspension wire 2c. Further, the inclination angle of the lower surface of the attachment 3 when suspended from the crane 8 can be easily set in a wide range.

  Further, since the attachment 3 is mounted in a state in which the pair of shells 2a is closed, the attachment 3 can be mounted in contact with the outer walls of the pair of shells 2a. Therefore, the attachment 3 can be attached to the bucket 2 in a more stable state as compared with the case where the pair of shells 2a are attached in the open state. Moreover, since the size of the attachment 3 can be made smaller than when the pair of shells 2a are mounted in the open state, the resistance of the water is reduced when the attachment 3 is freely dropped in water, and the underwater ground is pressed more strongly. Becomes possible.

  If the weight adjusting member 7 is accommodated inside the pair of shells 2a at the construction site and the weight of the bucket 2 is increased, it is not necessary to increase the weight of the attachment 3 in advance. Therefore, it is advantageous to reduce the weight of the attachment 3 and reduce the transportation cost.

  Furthermore, the weight of the weight 1 can be adjusted by changing at least one of the type and amount of the weight adjusting member 7 housed inside the pair of shells 2a, so, for example, the condition of the ground and the required strength of the ground The pressing force can be set flexibly in accordance with. Along with this, it is possible to level the construction site with a suitable pressing force.

  In this embodiment, since the entire periphery of the pair of shells 2a is surrounded by the intermediate member 4a, the attachment 3 is less likely to be displaced relative to the bucket 2. Therefore, the weight 1 can be freely dropped many times repeatedly without maintenance.

  Moreover, as shown in FIG. 6, the undulation of the rubble of the slope S can be roughly leveled by dragging the weight 1 along the slope S in a state where the weight 1 is in contact with the underwater ground. If the work of dragging the weight 1 is performed before the work of freely dropping the weight 1 and pressing it, the rubbish can be pressed in a roughly leveled state, so the surface of the slope S is finished more uniformly Can.

  The center of gravity G3 of the attachment 3 is set at the center in the width direction by configuring the attachment 3 (the pressing portion 5) by combining a plurality of members (for example, the member 5a and the member 5b) as in the embodiment illustrated in FIG. It can also be done. When the attachment 3 is mounted on the bucket 2 with the widthwise center of the bucket 2 and the widthwise center of the attachment 3 aligned, the center of gravity G1 becomes a position on the imaginary straight line B. That is, the weight 1 is suspended in a neutral state.

  With this configuration, it is possible to reduce the amount of change in the angle β which changes depending on the relative center-of-gravity position of the bucket 2 and the attachment 3. Therefore, the inclination of the lower surface of the attachment 3 when the bucket 2 is suspended can be maintained the same as or equivalent to the preset inclination angle α.

  Another attachment 3 of the present invention is illustrated in FIG. In this embodiment, the attachment 3 illustrated in the previous embodiment is provided with the accommodation portion 6 for accommodating the weight adjustment member 7. The housing portion 6 is a space capable of housing the weight adjustment member 7 formed in the intermediate member 4 a of the attachment portion 4 and / or the pressing portion 5. In this embodiment, a single housing disposed in the central portion of the attachment 3 is formed of a hole formed in the central portion in a plan view of the intermediate member 4a and a concave portion inserted in the hole and formed in the pressing portion 5. Part 6 is configured. In addition, the accommodating part 6 can also be provided by dividing into a plurality of places.

  The method of leveling the slope S of the underwater ground using this attachment 3 will be described below.

  First, a stone material, soil, etc. in the vicinity of the construction site are scooped a predetermined amount by the bucket 2 as the weight adjustment member 7 and stored in the storage portion 6. Next, a predetermined amount of stone, soil, etc. around the construction site is scooped by the bucket 2 as the weight adjusting member 7 and accommodated in the pair of shells 2 so as to be closed. In the case of forming a mound in water by rubbish, it is convenient to use the rubbish as the weight adjusting member 7 because it is not necessary to prepare the weight adjusting member 7 specially.

  Next, the lower end of the bucket 2 moved downward is placed in contact with the predetermined position of the upper end of the intermediate member 4a. The subsequent steps of attaching the attachment 3 to the bucket 2 and the steps of freely dropping the weight 1 are the same as in the previous embodiment.

  In this embodiment, since the weight of the attachment 3 can be increased by storing the weight adjusting member 7 in the housing portion 6 at the construction site, it is not necessary to increase the weight of the attachment 3 in advance. Therefore, it is advantageous to reduce the weight of the attachment 3 and reduce the transportation cost.

  In addition, since the weight of the weight 1 can be adjusted by changing at least one of the type and amount of the weight adjusting member 7 accommodated in the accommodation portion 6, for example, according to the condition of the ground and the required strength of the ground The pressing force can be set flexibly. Along with this, it is possible to level the construction site with a suitable pressing force.

  FIG. 9 illustrates still another attachment 3 of the present invention. In this embodiment, the attachment 3 is attached to the bucket 2 with the pair of shells 2a opened. In this embodiment, the pair of shells 2a is fully open.

  When attaching the attachment 3 to the bucket 2 in a state in which the pair of shells 2a is open, it is difficult to secure the contact area between the attachment 3 and the pair of shells 2a as compared to the state in which the pair of shells 2a is closed. Therefore, in order to stably attach the attachment 3 to the bucket 2, it is preferable to mold the intermediate member 4a according to the shape of the state in which the pair of shells 2a is open, and to increase the area that can abut on the pair of shells 2a. . For example, a recess having an outer peripheral shape along the opening edge of the pair of shells 2a in an open state, or a groove in which the opening edge is inserted is formed on the surface of the intermediate member 4a.

  The method of leveling the slope S of the underwater ground using this attachment 3 will be described below.

  First, the bucket 2 moved downward is disposed at a predetermined position of the upper end portion of the intermediate member 4a so as to be inserted in a state in which the pair of shells 2a is open. Specifically, with the open edges of the pair of shells 2a in the open state inserted into the upper surface of the intermediate member 4a, the pair of shells 2a is operated so as to slightly close the intermediate member 4a and the pair of shells Engage with 2a. The subsequent steps of attaching the attachment 3 to the bucket 2 and the step of freely dropping the weight 1 are the same as in the previous embodiment, and the weight 1 can be freed with the lower surface of the attachment 3 inclined relative to the horizontal. Let it fall.

  In this embodiment, since the attachment 3 is mounted in a state in which the pair of shells 2a is opened, the size of the attachment 3 can be easily increased as compared with the case in which the pair of shells 2a is mounted in a closed state. If the size of the attachment 3 is increased, it is possible to press a wider range of underwater ground in one free fall.

Moreover, since the bucket 2 is originally designed on the assumption that it collides with the ground in a state in which the pair of shells 2a is open, in this embodiment, an unexpected load is unlikely to occur in the bucket 2. In addition, the accommodating part 6 mentioned above can be provided also to the attachment 3 of this embodiment.

  Another attachment 3 is illustrated in FIG.

  The intermediary member 4 of the attachment 3 used in this embodiment has the same configuration as that of the embodiment illustrated in FIGS.

  The lower surface and the upper surface of the pressing portion 5 are parallel to each other, and the lower surface is formed in a horizontal surface shape. The pressing portion 5 is configured by combining members 5a and 5b different in density (specific gravity), so that the center of gravity G3 of the attachment 3 is eccentric to one side with respect to the center in the width direction. The dimensions in the X direction and the Y direction of the pressing portion 5 are substantially the same as the maximum dimensions in the X direction and the Y direction when the pair of shells 2a of the bucket 2 is closed.

  The method of leveling the slope S of the underwater ground using this attachment 3 will be described below.

  The process until the bucket 2 and the attachment 3 are integrated is the same as that of the embodiment illustrated in FIGS. For example, the attachment 3 is mounted on the bucket 2 with the widthwise center of the bucket 2 and the widthwise center of the attachment 3 being aligned. Next, the bucket 2 (weight 1) on which the attachment 3 is mounted is suspended by a crane mounted on a work ship or the like using the suspension wire 2c. Then, the center of gravity G1 is shifted from the virtual straight line B, and the weight 1 rotates about the pin 2f in the width direction by an angle β. Therefore, the bucket 2 is suspended in an inclined state with respect to the neutral state, and the inclination of the lower surface of the weight 1 with respect to the horizontal is the angle β. In this state, the weight 1 is dropped freely. The subsequent steps are the same as in the previous embodiment.

  In this embodiment, the lower surface of the attachment 3 is formed in a horizontal plane. Therefore, since the attachment 3 can be stably placed on a flat surface, the work of attaching the attachment 3 to the bucket 2 becomes easy.

  It is also possible to provide the above-mentioned accommodating part 6 also with respect to the attachment 3 of this embodiment, or to attach the bucket 2 in a state in which the pair of shells 2a are open. Also, the lower surface of the attachment 3 can be formed into an inclined surface.

  Another attachment 3 is illustrated in FIG.

  The intermediary member 4 of the attachment 3 used in this embodiment has the same configuration as that of the embodiment illustrated in FIGS.

  The pressing portion 5 is an L-shaped member in a front view in which the lower surface is formed in a horizontal surface shape. Since the pressing portion 5 is eccentric to one side in the width direction with respect to the intermediary member 4 a, the center of gravity G 3 of the attachment 3 is at a position shifted from the center in the width direction of the attachment 3.

  For example, the attachment 3 is attached to the bucket 2 with the center in the width direction of the intermediate member 4 a and the center in the width direction of the bucket 2 in alignment. Next, when the bucket 2 is suspended, the weight 1 rotates about the pin 2 f in the width direction by an angle β. Thus, the bucket 2 is suspended at an angle with respect to the neutral state, and the lower surface of the weight 1 is inclined at an angle β with respect to the horizontal.

  The method of leveling the slope S of the underwater ground using this attachment 3 is the same as that of the embodiment illustrated in FIG.

  In this embodiment, since the lower surface of the attachment 3 is formed in a horizontal plane, it can be stably mounted on a flat surface. Therefore, the work of attaching the attachment 3 to the bucket 2 is facilitated. Moreover, the center of gravity G3 of the attachment 3 is shifted from the center of the attachment 3 in the width direction only by unevenly distributing the pressing portion 5 with respect to the center of the attachment 3 in the width direction. Therefore, although the lower surface of the attachment 3 is formed in a horizontal plane, it has a simple structure for inclining the lower surface of the suspended weight 1.

  In addition, providing the accommodating part 6 mentioned above also to the attachment 3 of this embodiment can also be set as the structure mounted | worn with the bucket 2 of the state which opened the pair of shells 2a. Moreover, the lower surface of the attachment 3 can also be formed in the shape of an inclined surface, and the pressing portion 5 can also be configured using a plurality of members.

  Another attachment 3 is illustrated in FIG.

  This attachment 3 is provided with two accommodating parts 6 in the attachment 3 of the embodiment illustrated in FIGS. Specifically, the housing portion 6 configured by a hole vertically penetrating the intermediary member 4 a and a concave portion formed in the pressing portion 5 by being inserted through the hole is symmetrical 2 with respect to the imaginary straight line B. It has been set up.

  The attachment 3 can change the position of the center of gravity G3 of the attachment 3 by changing the weight balance of the weight adjusting members 7 accommodated in the respective accommodating portions 6 provided at the left and right two places. That is, by attaching the attachment 3 to the bucket 2, it is possible to change the angle β which is generated when the center of gravity G 1 of the weight 1 deviates from the imaginary straight line B. For example, if the weight adjustment member 7 is stored in the storage portion 6 on the right side with the storage portion 6 on the left side empty in front view, the center of gravity G3 moves to the right side with relatively large weight.

  The method of leveling the slope S of the underwater ground using this attachment 3 will be described below.

  First, a stone material, soil, etc. in the vicinity of the construction site are scooped a predetermined amount by the bucket 2 as the weight adjustment member 7 and stored in the storage portion 6. By adjusting the weight balance of the weight adjusting member 7 housed in the housing portion 6, the inclination angle of the lower surface of the attachment 3 (weight 1) mounted on the suspended bucket 2, that is, the lower surface of the pressing portion 5 decide. The subsequent steps of attaching the attachment 3 to the bucket 2 and the steps of freely dropping the weight 1 are the same as in the previous embodiment.

  In this embodiment, the inclination angle α + β of the lower surface of the suspended weight 1 can be changed by changing the weight balance of the weight adjusting members 7 accommodated in the respective storage portions 6. That is, the bucket 2 to which the attachment 3 is attached can be suspended in a neutral state, or can be suspended at an angle to the neutral state.

  Moreover, in this embodiment, the lower surface of the attachment 3 is previously formed in the shape of an inclined surface, and the bucket 2 on which the attachment 3 is mounted can be suspended by being inclined with respect to the neutral state. Therefore, it is also possible to further increase the inclination angle of the lower surface of the weight 1 when suspended from the crane 8.

  In addition, the accommodating part 6 can also be provided in two or more places of the attachment 3. FIG. The attachment 3 of this embodiment can also be configured to be attached to the bucket 2 in a state in which the pair of shells 2a described above is opened. Further, the lower surface of the attachment 3 may be formed in a horizontal plane, or the pressing portion 5 may be formed using a plurality of members.

1 Weight 2 Grab bucket 2a Shell 2b Upper block 2c Hanging wire 2d Opening and closing sheave 2e Opening and closing wire 2f Pin 2g Connecting member 3 Attachment for underwater ground leveling 4 Mounting portion 4a Intermediary member 4b Connecting member 5 Pressing portion 5a, 5b Member 6 Housing part 7 Weight adjustment member 8 Crane 9 Installation stand S slope G1 Center of gravity G2 Weight of gravity of grab bucket Center of gravity G3 of attachment Weight of attachment

Claims (4)

In a method of leveling an underwater ground, the weight suspended from a crane is allowed to freely fall to press the underwater ground, thereby leveling the surface of the underwater ground to a predetermined shape,
Using the grab bucket equipped with the removable underwater ground leveling attachment at the lower end as the weight, the pair of shells of the grab bucket suspended from the crane are opened and the grab bucket in this state A method of leveling an underwater ground, characterized in that the weight is allowed to freely fall in a state where the lower surface of the attachment attached to is inclined with respect to the horizontal. In a method of leveling an underwater ground, the weight suspended from a crane is allowed to freely fall to press the underwater ground, thereby leveling the surface of the underwater ground to a predetermined shape,
A grab bucket equipped with a removable underwater ground leveling attachment at its lower end is used as the weight, and a pair of shells of the grab bucket suspended from a crane are closed and the pair of shells The weight adjustment member held by closing the pair of shells is accommodated in the interior of the case, and the lower surface of the attachment attached to the grab bucket in this state is inclined relative to the horizontal. A method of leveling an underwater ground, characterized by free fall of a weight. The method of leveling an underwater ground according to claim 1 or 2 , wherein a storage portion is provided in the attachment, and a weight adjustment member is stored in the storage portion. An underwater ground leveling attachment that is removably attached to a grab bucket,
A mounting portion detachably connected to the lower end portion of the grab bucket, and a pressing portion disposed below the mounting portion to press the surface of the underwater ground, the pair of shells of the grab bucket being opened And the mounting portion is detachably connected to the lower end portion of the grab bucket, and the lower surface of the pressing portion is horizontal when the mounting portion is mounted on the grab bucket suspended from a crane. An underwater ground leveling attachment characterized in that it is configured to be inclined relative to.

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