JP4298879B2 - Water bottom transfer device and structure bottom water transfer method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a water bottom transfer device for moving a water bottom structure such as a submerged box and a water bottom transfer method for a structure using the same.
[0002]
[Prior art]
There are many cases where a structure is accurately submerged at a predetermined bottom position, such as a submerged box in a submergence method.
[0003]
For example, in the case of a submerged box, conventional laying methods include a tower pontoon method, a placing barge method, a placing pontoon method, a self-elevating work platform ship (SEP method), and a floating crane method. These are sinking methods that suspend and adjust the position of the sinking box using winches and wires installed in pontoons, barges, SEPs, and floating cranes. That is, in all the conventional sinking methods, the position of the sinking box is adjusted by adjusting the length of the wire with the winch.
[0004]
[Problems to be solved by the invention]
However, in the conventional method described above, when the water depth at the settling point is deep, the wire inevitably becomes long and the sag of the wire becomes large. In such a case, it becomes difficult to finely adjust the position of the sinking box by the winch operation.
In addition, when the tidal current is fast, fine adjustment of the position of the submergence box is difficult for the same reason as when the water depth at the subsidence is deep, and the amount of rocking of the submergence box increases due to the influence of the tidal current. Sinking was difficult.
For these reasons, the past construction results have been limited to a maximum water depth of about 30 m. In addition, in locations where tidal currents are expected, it was necessary to make final fine adjustments during the tidal period, so the construction timing was limited.
[0005]
An object of the present invention is to provide a water bottom moving device that enables a position of a water bottom to be adjusted by moving a water bottom structure such as a submerged box after being set up, and a water bottom transfer method for the structure using the same.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the invention described in claim 1
A bottom transfer device (1a, 1b) for transferring a bottom structure (for example, a sinking box 100),
Attachment means for attaching the water bottom transfer device to the structure (for example, the support portion 6);
A plurality of support jacks (for example, the end support jack 3 and the center support jack 5) for supporting the water bottom transfer device main body and the structure from the water bottom;
A first transfer jack (for example, a horizontal jack) that moves a first moving support jack (for example, the center column jack 5), which is a part of the plurality of support jacks, in one direction along the bottom of the water bottom transfer device main body. 7) and
A second transfer jack (e.g., horizontal jack) that moves a second moving support jack (e.g., center column jack 5) that is a part of the plurality of support jacks in the other direction along the bottom with respect to the bottom transfer device body. 7) and
With
One of the support jacks is a rotation support jack (for example, a central support jack 5 located at the center) attached to the water bottom transfer device main body so as to be rotatable to the left and right.
[0007]
The invention according to claim 2 is the water bottom transfer device according to claim 1,
The support jack includes a foot portion (for example, footings 33 and 53) that can swing with respect to the support jack.
[0008]
The invention described in claim 3 is the water bottom transfer device according to claim 1 or 2,
The attachment means includes rotation means (for example, a concave portion 61 and a convex portion 111) that enables the water bottom transfer device main body to rotate with respect to a structure.
[0009]
Invention of Claim 4 is the bottom transfer apparatus in any one of Claims 1-3,
The attachment means attaches the water bottom transfer device main body to the structure in a detachable manner.
[0011]
Invention of Claim 5 is the bottom transfer apparatus in any one of Claims 1-4,
At least one of the support jacks other than the rotation support jack (for example, the central support jacks 5 located at both ends) is attached to the water bottom transfer device main body so as to be rotatable and slidable with the rotation support jack as a rotation center. Features.
[0012]
According to these first to fifth aspects of the invention, the bottom structure can be transferred by the method of the sixth aspect.
[0013]
That is, the invention described in claim 6 is a water bottom transfer method for a structure including the water bottom transfer device according to any one of claims 1 to 5,
From the state where the structure is supported on the water bottom by a plurality of support jacks, the first movement support jack is shrunk away from the water bottom, and the first movement support jack is driven to transfer the first movement support jack. The first moving support jack is extended and lowered to the bottom of the water, and the supporting jacks other than the first moving support jack are contracted and separated from the bottom of the water, and the first transfer jack is driven, thereby the bottom transfer device. Transport the body in one direction with the structure,
From the state where the structure is supported on the water bottom by a plurality of support jacks, the second movement support jack is shrunk away from the water bottom, and the second movement support jack is driven to transfer the second movement support jack. By extending the second moving support jack and lowering it to the bottom of the water, further shrinking the supporting jack other than the second moving support jack and separating it from the bottom of the water, and driving the second transfer jack, the bottom transfer device The main body is transported in the other direction together with the structure.
[0014]
According to the sixth aspect of the present invention, the structure can be moved in one direction and the other direction without being dragged at the bottom of the water, that is, the structure can be moved in two different directions in a stable state. Therefore, the structure can be transferred to an arbitrary location on the bottom of the water.
[0015]
Even when the bottom of the water is tilted, the structure can be kept horizontal by adjusting the stroke (extension amount) of each support jack according to the tilt of the bottom of the water.
[0016]
Here, when the water bottom transfer device according to claim 2 is used, since the scaffold can swing with respect to the support jack, the scaffold absorbs unevenness (unevenness) of the water bottom. Therefore, the water bottom transfer device and the structure And will not tilt due to the unevenness of the bottom of the water.
[0017]
Further, when the water bottom transfer device according to claim 3 is used, the water bottom transfer device can be rotated in the deflection direction of the structure by the rotation means of the attachment means. Therefore, even if the water bottom transfer device mounting portion in the structure bends due to the weight of the structure, the rotation means absorbs the deflection, so the water bottom transfer device does not tilt and supports the structure stably.
[0018]
Moreover, if the bottom transfer apparatus of Claim 4 is used, after a structure is arrange | positioned in a predetermined position, a bottom transfer apparatus can be isolate | separated from a structure and can be collect | recovered. Therefore, the cost can be reduced by reusing the bottom transfer device.
[0019]
Furthermore, the invention described in claim 6
The structure includes a plurality of the bottom transfer devices, at least one of which is the bottom transfer device according to claim 1 or 5,
6. The structure is pushed by pushing the structure in one direction or the other direction by another bottom transfer device with the rotation support jack of the bottom transfer device of claim 1 or 5 as a center of rotation. It rotates with the water bottom transfer apparatus main body of description.
[0020]
Therefore, according to the sixth aspect of the present invention, the structure can be rotated about the rotation support jack as the rotation center. Therefore, in addition to positioning the structure at an arbitrary position on the bottom of the water, the direction of the structure can also be adjusted arbitrarily.
[0021]
Here, when using the water bottom transfer device according to the first aspect, the water bottom transfer device main body can be rotated by shrinking the support jack other than the rotation support jack.
Moreover, when using the water bottom transfer apparatus of Claim 2, the support jack which can be slid is good also as getting down to the water bottom with the rotating jack. In this case, since the support jack slides with the rotation of the water bottom transfer device body, the rotation is not hindered.
[0022]
A seventh aspect of the present invention is the method for transferring a bottom of a structure according to the sixth aspect, wherein the structure is a submerged box (100) used for a submergence method.
[0023]
According to the seventh aspect of the invention, the submerged box can be transferred to an arbitrary position at an arbitrary angle after being temporarily set on the bottom of the water.
Accordingly, since the submergence box can be accurately submerged at a predetermined position even under conditions where the submergence box cannot be accurately submerged by the conventional method, such as when the water depth is deep or when the tidal current is fast, the application range of the submergence method is expanded.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
As shown in FIG. 1, one of the water bottom transfer device 1 a and the water bottom transfer device 1 b is attached to brackets 110 provided at the four corners of the submergence box 100, so that the water bottom submergence box 100 is placed at a predetermined position. It is a device to transfer. In the following description, as shown in the figure, two water bottom transfer devices 1a are attached at two diagonal positions with the sinking box 100 between them, and the water bottom transfer device 1b is attached at the remaining two locations. To do.
[0025]
First, the configuration will be described. Here, since the water bottom transfer devices 1a and 1b have substantially the same configuration, the water bottom transfer device 1a will be described first, and then the parts of the water bottom transfer device 1b that are different from the water bottom transfer device 1a will be described.
[0026]
As shown in each drawing of FIGS. 2 to 5, the water bottom transfer device 1 a fixes three end strut jacks 3 along each side in the vicinity of two opposing sides of the lower surface of the substantially rectangular parallelepiped outer plate 2. The inner plate 4 is slidably mounted in both vertical and horizontal directions between the two rows of the end column jacks 3 on the lower surface of the outer plate 2, and the central column jack 5 is mounted on the inner plate 4 in parallel with the columns of the end column jacks 3. The three support units 6 are mounted side by side, and three support portions 6 that directly support the sinking box 100 are mounted on the upper surface of the outer plate 2 in total, three in total. Here, the inner plate 4 slides along the lower surface of the outer plate 2 by a horizontal jack 7 on the lower surface of the outer plate 2 as will be described in detail later. In FIG. 2, the support 6 is not shown.
[0027]
As shown in FIGS. 3 and 4, the end column jack 3 is covered with an upper pedestal steel pipe 31 and a lower pedestal steel pipe 32, the upper end is directly fixed to the outer plate 2, and the lower end is fixed to the footing 33. It is the structure joined by rotation.
The upper pedestal steel pipe 31 has a structure in which the upper end is fixedly joined to the outer plate 2 and the lower pedestal steel pipe 32 is accommodated in the lower end from the lower end. Moreover, the lower pedestal steel pipe 32 is the structure which joined the end footing 33 to the lower end so that rocking | fluctuation was possible.
That is, the lower pedestal steel pipe 32 extends from the upper pedestal steel pipe 31 when the end strut jack 3 extends, and fits in the upper pedestal steel pipe 31 when the end strut jack 3 contracts.
Further, the end footing 33 is provided with a spike 33a as a slip stopper on the lower surface.
[0028]
The inner plate 4 is a rectangular parallelepiped plate as shown in FIGS. 2, 4, and 5, and has a configuration in which one end of a separate horizontal jack 7 is built in and fixed to each of the four end surfaces. Here, the other end of the horizontal jack 7 is fixed to a horizontal jack receiver 21 that protrudes from the lower surface of the outer plate 2 and surrounds the inner plate 4.
That is, the inner plate 4 moves in one direction by contracting one of the horizontal jacks 7 fixed to the two opposite end faces and extending the other, and the horizontal jack 7 fixed to the other two end faces is the same. It moves to the other by driving.
[0029]
As shown in FIGS. 3 and 5, the center column jack 5 is covered with an upper leg column steel pipe 51 and a lower leg column steel pipe 52 as in the end column jack 3, and the lower end can swing to a footing 53 with a spike 53 a. It is the structure joined to.
Here, the upper end of the upper columnar steel pipe 51 is closed, and the upper end of the central column jack 5 is fixed to this upper end.
Moreover, the center jacks 5 at both ends of the three center column jacks 5 arranged in a line are both joined to the inner plate 4 so as to be slidable horizontally and in any direction. Further, the central column jack 5 located at the center is joined to the inner plate 4 so as to be rotatable left and right.
[0030]
The support portion 6 includes an assembling means (not shown) for assembling the outer plate 2, that is, the water bottom transfer device 1a, to the submergence box 100, and as shown in FIGS. A recessed portion 61 is provided. The concave portion 61 is in surface contact with the convex portion 111 protruding in the shape of a cylindrical circumferential surface of the bracket 110 of the submerged box 100. The direction of the recessed part 61 can be made to dent toward the center support | pillar jack 5 from the end support | pillar jack 3 side, as shown in the figure, for example.
That is, the support portion 6 is swingably assembled to the bracket 110 in a state where the convex portion 111 is placed on the concave portion 61. Even after attachment, it is variable with respect to the horizontal direction of the sinking box 100.
[0031]
Further, the water bottom transfer device 1b is configured such that all of the center column jacks 5 are fixedly joined to the outer plate 2 in the water bottom transfer device 1a.
[0032]
Further, each member of the water bottom transfer devices 1a and 1b is controlled by a cable (not shown) according to a signal input from a control device (not shown) on a mother ship (not shown).
[0033]
Next, a method of transferring the submerged box 100 on the water bottom 200 using the water bottom transfer devices 1a and 1b until it is connected to an existing submerged box 100 (for example, shown on the left side in FIG. 6) will be described. 10 to 16 and 18 to 24, the upper pedestal steel pipes 31 and 51 and the lower pedestal steel pipes 32 and 52 are not shown.
[0034]
First, on the mother ship described above, a floating recovery wire (not shown) is attached to the bottom transfer devices 1a and 1b, lowered to the sea with a crane, and attached to the submerged box 100 floating on the sea.
Then, the sink box 100 is temporarily set using a wire and a winch as in the conventional case (see FIG. 6).
When laid, the bracket 110 may bend in the lateral direction due to its own weight, but this deflection is absorbed when the concave portion 61 slides with respect to the convex portion 111.
[0035]
Then, as shown in FIG. 7, the angle is corrected by rotating and transferring the sinking box 100 with the one water bottom transfer device 1 a as the rotation center.
[0036]
The operations of the water bottom transfer devices 1a and 1b in this process are as follows.
That is, in each of the bottom transfer devices 1a and 1b, after all the end column jacks 3 and the center column jacks 5 are extended to support and stabilize the sinking box 100, all the end column jacks 3 are contracted and the footing 33 is contracted. Is separated from the bottom of the water, and the submerged box 100 is supported by only the three central column jacks 5.
Then, the water bottom transfer device 1a serving as the rotation center uses the central column jack 5 located at the center as the rotation center, and extends the horizontal jacks 7 to fix the inner plate 4 to the outer plate 2.
Further, the other water bottom transfer devices 1a and 1b drive the horizontal jack 7 positioned perpendicular to the submergence box 100, thereby pushing the submergence box 100 by a predetermined distance in a predetermined direction.
[0037]
By these operations, the sinking box 100 rotates.
At this time, in the water bottom transfer device 1a which is the center of rotation, as schematically shown in FIG. 8C, the portions other than the central column jack 5 are centered on the central column jack 5 located in the center, and FIG. ) From the dotted line to the solid line. Further, the other central column jack 5 is not moved relative to the water bottom 200 (not shown in FIGS. 7 and 8) by sliding with respect to the inner plate 4.
Further, in other water bottom transfer devices 1a and 1b, the parts other than the central column jack 5 and the inner plate 4 are shown in FIG. 8A (the bottom bottom water transfer device 1b in FIG. 7), FIG. 7 is moved by the horizontal jack 7 from the dotted line to the solid line in the bottom bottom transfer device 1a) and FIG. 8D (the bottom right transfer device 1b in FIG. 7). It is immobile with respect to the bottom 200. 8A, 8B, and 8D, the horizontal jack 7 is not shown.
[0038]
Next, as shown in FIG. 9, the submergence box 100 is moved in the horizontal direction so that the installed submergence box 100 and the central axis of the submergence box 100 are aligned.
[0039]
The operation of each of the bottom transfer devices 1a and 1b in this process will be described by taking the bottom transfer device 1a as an example.
First, as shown in FIG. 10, after extending both the end support jack 3 and the center support jack 5 and lowering the footings 33 and 53 onto the water bottom 200 to stabilize the submergence box 100, it is shown in FIG. Thus, the footing 53 is floated by shrinking all the three central column jacks 5.
Then, as shown in FIG. 12, by driving the horizontal jack 7 arranged perpendicular to the submergence box 100, the inner plate 4 is moved in the direction of transferring the submergence box 100 together with the central column jack 5 and the footing 53. After that, as shown in FIG. 13, the central column jack 5 is extended to lower the footing 53 onto the water bottom 200.
Then, as shown in FIG. 14, all the six end support jacks 3 are contracted to lift the footing 33 from the bottom 200, and then the horizontal jack 7 is driven in the direction opposite to that shown in FIG. Thus, the water bottom transfer devices 1a and 1b are transferred from the dotted line to the solid line together with the submergence box 100. Then, the end column jacks 3 are all extended to lower the footing 33 onto the water bottom 200, and the state shown in FIG. 12 is restored.
By repeating the operations shown in FIGS. 10 to 15, the embedding box 100 is transferred in the lateral direction.
[0040]
Next, as shown in FIG. 16, the submergence box 100 is transferred in the vertical direction, and the submergence box 100 is connected to the installed submergence box 100.
[0041]
The operation of each of the bottom transfer devices 1a and 1b in this process will be described by taking the bottom transfer device 1a as an example.
First, as shown in FIG. 17, after extending all of the end column jacks 3 and the center column jack 5 and lowering the footings 33 and 53 onto the water bottom 200 to stabilize the submergence box 100, as shown in FIG. All three center post jacks 5 are shrunk to lift the footing 53.
Then, as shown in FIG. 19, by driving a horizontal jack 7 installed in parallel to the submergence box 100, the inner plate 4 is moved in the direction of transferring the submergence box 100 together with the central column jack 5 and the footing 53. After that, as shown in FIG. 20, the central column jack 5 is extended to lower the footing 53 onto the water bottom 200.
Then, as shown in FIG. 21, all six end support jacks 3 are contracted to lift the footing 33 from the bottom 200, and then the horizontal jack 7 is driven in the direction opposite to that shown in FIG. Thus, the water bottom transfer devices 1a and 1b are transferred together with the submergence box 100. Then, the end column jacks 3 are all extended to lower the footing 33 onto the water bottom 200, and the state shown in FIG. 17 is restored.
By repeating the operations shown in FIGS. 17 to 22, the submerged box 100 is set in the vertical direction.
[0042]
Then, as shown in FIG. 23, each of the bottom transfer devices 1a and 1b is separated from the submergence box 100, pulled up to the sea surface with a wire (not shown), and recovered and reused.
[0043]
In addition, in the process mentioned above, since the footing 33 * 53 is joined with respect to the end support | pillar jack 3 and the center support | pillar jack 5 so that rocking | fluctuation is possible, the unevenness | corrugation of the water bottom 200 is absorbed.
Moreover, when the water bottom 200 is slanted, the submerged box 100 can be kept horizontal by adjusting the extension amount of each of the end column jacks 3 and the center column jacks 5 separately.
[0044]
Therefore, by using the water bottom transfer devices 1a and 1b, the embedding box 100 temporarily set in the water bottom can be transferred and easily set in a predetermined water bottom position.
For this reason, when the water depth is deep or when the tidal current is fast, the submergence box 100 can be accurately subsidized even in the construction region that could not be subsidized accurately by the conventional method, and the construction conditions of the submergence method are eased. The scope of application is expanded.
[0045]
In addition, in the above embodiment, it was set as the structure which transfers the submergence box 100 with the water bottom transfer apparatus 1a * 1b, However, this invention is not limited to this, Other using a water bottom transfer apparatus 1a * 1b It is good also as a structure which transfers the structure of above on a water bottom.
Moreover, it is good also as a structure which only makes the center support | pillar jack 5 of both ends rotate slide centering on the center support | pillar jack 5 of the center.
Moreover, although the recessed part 61 of the support part 6 was dented in the shape of a cylindrical peripheral surface, the water bottom transfer device 1a- You may make it the structure which makes the angle with respect to the sinking box 100 of 1b variable in arbitrary directions.
Further, the number of the end column jacks 3 and the center column jacks 5 is arbitrary, and it is needless to say that other specific configurations can be appropriately changed.
[0046]
【The invention's effect】
According to invention of Claims 1-5, the structure of a water bottom can be transferred by the method of Claim 6.
[0047]
When the water bottom transfer device according to claim 2 is used, the water bottom transfer device, that is, the structure does not tilt due to the unevenness of the water bottom.
When the water bottom transfer device according to claim 3 is used, even if the water bottom transfer device mounting portion in the structure is bent due to the weight of the structure, the rotating means absorbs the deflection, so the water bottom transfer device does not tilt, Supports things stably.
When the bottom transfer device according to claim 4 is used, the cost can be reduced by reusing the bottom transfer device.
[0048]
According to the sixth aspect of the invention, in addition to positioning the structure at an arbitrary position on the bottom of the water, the direction of the structure can also be adjusted arbitrarily.
[0049]
According to the seventh aspect of the invention, since the submergence box can be accurately submerged at a predetermined position even under conditions where the submergence box cannot be submerged accurately by the conventional method, such as when the water depth is deep or the tidal current is fast, The range expands.
[Brief description of the drawings]
FIG. 1 is a plan view showing a configuration in which a water bottom transfer device according to an embodiment to which the present invention is applied is attached to a sinking box.
FIG. 2 is a partially omitted plan view showing the configuration of the water bottom transfer device.
3 is a cross-sectional view taken along the line AA in FIG.
4 is a cross-sectional view taken along the line BB in FIG.
FIG. 5 is a cross-sectional view taken along the line CC of FIG.
6 is a plan view showing step by step a sinking box transfer method using the water bottom transfer device of FIG. 2;
7 is a plan view showing a step subsequent to FIG. 6. FIG.
FIGS. 8A, 8B, 8C and 8D are plan views showing the operation of the water bottom transfer device in the process of FIG.
9 is a plan view showing a step subsequent to FIG. 7. FIG.
FIG. 10 is a schematic end view illustrating the details of the process of FIG. 9 in stages.
FIG. 11 is a schematic end view illustrating the details of the process of FIG. 9 in stages.
12 is a schematic end view illustrating the details of the process of FIG. 9 in stages.
FIG. 13 is a schematic end view illustrating the details of the process of FIG. 9 in stages.
FIG. 14 is a schematic end view illustrating the details of the process of FIG. 9 in stages.
FIG. 15 is a schematic end view illustrating the details of the process of FIG. 9 in stages.
16 is a plan view showing a step subsequent to FIG. 9. FIG.
FIG. 17 is a schematic side view illustrating the details of the process of FIG. 16 in stages.
FIG. 18 is a schematic side view illustrating the details of the process of FIG. 16 in stages.
FIG. 19 is a schematic side view illustrating the details of the process of FIG. 16 in stages.
FIG. 20 is a schematic side view illustrating the details of the process of FIG. 16 in stages.
FIG. 21 is a schematic side view illustrating the details of the process in FIG. 16 in a stepwise manner.
FIG. 22 is a schematic side view illustrating the details of the process of FIG. 16 in a stepwise manner.
FIG. 23 is a plan view showing a step subsequent to that in FIG. 16;
[Explanation of symbols]
1a, 1b Bottom transfer device 3 End support jack (support jack)
5 Center post jack (1st and 2nd moving support jack, rotation support jack)
6 Supporting part (attachment means)
7 Horizontal jacks (first and second transfer jacks)
33.53 Footing (foot)
61 Concave portion (part of rotating means)
100 Sinking box 111 Convex part (part of rotating means)

Claims (7)

A bottom transfer device for transferring a bottom structure,
Attachment means for attaching the water bottom transfer device to the structure;
A plurality of support jacks for supporting the water bottom transfer device main body and the structure from the water bottom;
A first transfer jack that moves a first moving support jack that is a part of the plurality of support jacks in one direction along the bottom of the water bottom transfer device;
A second transfer jack that moves a second moving support jack, which is a part of the plurality of support jacks, in the other direction along the bottom of the water bottom transfer device body;
With
One of the support jacks is a rotary support jack that is attached to the water bottom transfer device main body so as to be rotatable to the left and right.   The water bottom transfer device according to claim 1, wherein the support jack includes a foot that can swing with respect to the support jack.   The water bottom transfer device according to claim 1, wherein the attachment means includes a rotation means that allows the water bottom transfer device main body to rotate with respect to a structure.   The water bottom transfer device according to any one of claims 1 to 3, wherein the attachment means attaches the water bottom transfer device main body to a structure in a detachable manner.   5. The support jack according to claim 1, wherein at least one of the support jacks other than the rotation support jack is attached to the water bottom transfer device main body so as to be rotatable and slidable around the rotation support jack. The water bottom transfer device described in 1. A method for transferring the bottom of a structure comprising the bottom transfer device according to claim 1,
From the state where the structure is supported on the water bottom by a plurality of support jacks, the first movement support jack is shrunk away from the water bottom, and the first movement support jack is driven to transfer the first movement support jack. The first moving support jack is extended and lowered to the bottom of the water, and the supporting jacks other than the first moving support jack are contracted and separated from the bottom of the water, and the first transfer jack is driven, thereby the bottom transfer device. Transport the body in one direction with the structure,
From the state where the structure is supported on the water bottom by a plurality of support jacks, the second movement support jack is shrunk away from the water bottom, and the second movement support jack is driven to transfer the second movement support jack. By extending the second moving support jack and lowering it to the bottom of the water, further shrinking the supporting jack other than the second moving support jack and separating it from the bottom of the water, and driving the second transfer jack, the bottom transfer device Transport the body with the structure in the other direction,
Furthermore, the structure includes a plurality of the bottom transfer devices, at least one of which is the bottom transfer device according to claim 1 or 5,
6. The structure is pushed by pushing the structure in one direction or the other direction by another bottom transfer device with the rotation support jack of the bottom transfer device of claim 1 or 5 as a center of rotation. A method of transferring a bottom of a structure, wherein the structure is rotated together with the main body of a bottom transfer device.   The method of transferring a bottom of a structure according to claim 6, wherein the structure is a submerged box used for a submergence method.

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