JP4795699B2 - Sand pile driving ship - Google Patents

Description

The present invention relates to a sand pile driving ship used for improving seabed ground .

  When expanding harbor facilities or constructing offshore artificial islands, a sand pile driving method (so-called sand compaction method) in which sand piles are driven is used to improve the soft ground on the seabed. In carrying out such a construction method, for example, a sand pile driving ship as shown in FIG. 13 is used.

  A sand pile driving ship 100 shown in FIG. 13 mainly includes a long leader 101 erected on the hull, a cylindrical casing pipe 103 suspended up and down along the leader 101, In order to support the vibro hammer 105 connected to the upper end of the casing pipe, the winch 107 for raising and lowering the casing pipe 103 and the vibro hammer 105, the hopper for supplying sand into the casing pipe 103, and the raising and lowering of the casing pipe 103 from the side. And a pipe keeper 109 provided at the bow.

  When placing a sand pile using the above-described sand pile placing ship, the casing pipe 103 is penetrated into the soft ground below the sea surface along the standing leader 101, and the sand is removed from the upper hopper to the casing pipe. The casing pipe 103 is penetrated into the soft ground by a predetermined depth through vibration by the vibro hammer 105 and pulled up to form a sand pile in the soft ground.

  However, the construction by the conventional sand pile driving ship described above has the following problems due to the length of the leader and the casing pipe.

  For example, when a sand pile burial depth of about 30 m is required, assuming that the depth from the sea surface to the sea floor is about 15 m, the length of the casing pipe is about 50 m. Moreover, the height of the leader standing on the sand pile driving ship reaches about 60 m from the sea surface in consideration of the total length including various working devices such as a vibratory hammer.

  However, in the area around the airport, a height restriction is provided from the viewpoint of ensuring safe takeoff and landing of the aircraft, and therefore construction that complies with the restriction is required. Therefore, when there is an airport near the construction site, if the site overlaps the aircraft take-off and landing course, the casing pipe or leader may interfere with the take-off and landing of the aircraft. It may not be possible.

  On the other hand, when improving the soft ground on the seabed, there is a desire to improve to a deeper position. In order to meet such a demand, a longer casing pipe is required. Therefore, it is necessary to bring a casing pipe having a required length to the construction site while observing the height restriction. Therefore, a method of keeping a part of the long casing pipe (for example, about 10 m) submerged in the sea not only during the ground improvement work but also during the movement to the construction site has been studied. However, although this method does not violate the height restriction, there is a risk that the bottom end of the casing pipe may collide with an obstacle on the seabed or be caught on the seabed ground when the carriage is moved.

  Moreover, as the required construction depth increases, the height of the casing pipe becomes higher and the water height of the leader becomes higher. For this reason, conventional sand pile driving boats cannot navigate under the roads and bridges constructed on the sea, and it is necessary to select a route that is largely detoured in order to move to the target position, or can call at the port. There is a problem of disappearing.

Therefore, in view of the above-mentioned problems caused by the length of the leader and the casing pipe, the object of the present invention is to improve the ground at a large depth while complying with the height restriction defined for the peripheral area of the construction site. It is another object of the present invention to provide a sand pile driving ship that enables a safe and smooth movement .

The above purpose is
This is a sand pile driving ship equipped with multiple pipes that can be joined together to form a casing pipe, suspending the pipes side by side when moving, and joining the pipes as casing pipes during ground improvement work. And
The pipes suspended side by side can be inserted, and an opening that leads to the sea surface;
A movable bracing device that is displaceable between an open position that allows insertion of the pipe suspended in parallel to an opening portion and a bracing position that prevents the casing pipe from shaking;
The movable anti-vibration device is
A support member for supporting the casing pipe from the outer wall side;
The support member is mounted, and a support member mounting bracket that is pivotally supported between the swinging position and the open position, and
Achieved by a sand pile driving ship having a rotation restricting member for preventing the movable anti-vibration device in the detent position from rotating as the casing pipe moves up and down during ground improvement work Is done.

The support member mounting hardware has a piece for attaching a chain block,
This piece is connected to at least one of the pipe and the hull via a chain block when the support member mounting hardware is rotated.

According to the present invention, since the movable anti-vibration device is rotatably provided, the switching operation of the movable anti-vibration member between the anti-vibration position and the open position can be easily performed. Further, during the ground improvement work, the rotation of the movable anti-vibration device is restricted by the rotation restricting member, so that it does not rotate as the casing pipe moves up and down. As a result, it is possible to ensure the vertical accuracy of the casing pipe more reliably.

According to the present invention , the support member mounting hardware is connected to at least one of the main pipe, the sub pipe, and the hull of the sand pile driving ship through the chain block. Therefore, when performing the rotation work of the movable anti-vibration device, the movable anti-vibration device can be set at a desired position by using the tension of the pipe and the chain block that are moved up and down. As a result, it is possible to reduce the labor when rotating the movable bracing device.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[Composition of sand pile driving ship]
First, based on FIGS. 1-4, the structure of a sand pile driving ship is demonstrated.
FIG. 1 is a side view partially showing the bow side of a sand pile driving ship 1 (in a moving state) according to the present invention.
FIG. 2 is an enlarged side view showing the bow side of the sand pile driving ship 1 according to the present invention (state during ground improvement work). In FIG. 2, the casing pipe is not shown.
FIG. 3 is a top view showing a part of the sand pile driving ship 1 of FIG.
FIG. 4 is an enlarged view showing the bow side bracing device 8d of the sand pile driving boat 1 of FIG. 2 (the bracing position is indicated by a solid line and the open position is indicated by a virtual line).

  The sand pile driving ship 1 is a ship (so-called sand compaction ship) used for improving the soft ground on the seabed, and mainly by joining with a long leader 3 standing on the hull. It has two pipes (main pipe 4, sub pipe 5) that can form a casing pipe, and a pipe keeper section 7 that supports the casing pipe that moves up and down from the side to ensure vertical accuracy.

  In this embodiment, the embodiment is described only in relation to one leader and one casing pipe. However, the number of leaders and casing pipes that the sand pile driving ship according to the present invention should be equipped with is one. It is not limited to one. That is, the present invention also includes an aspect in which a plurality of leaders and casing pipes are connected in the horizontal direction as in the conventional case. Therefore, when a plurality of leaders and casing pipes are connected, a plurality of sets of pipes capable of forming a plurality of casing pipes are provided.

  As shown in FIG. 1, the main pipe 4 (hollow tube) constituting the upper part of the casing pipe includes a flange portion 41 provided on the lower end side, and a lower portion fixed to the outer wall in the vicinity of the upper side of the flange portion 41. The connecting members 43 and 43 and upper connecting members 45 and 45 fixed to the outer wall in the middle of the main pipe 4 are provided. In the present embodiment, the lower connecting members 43 and 43 and the upper connecting members 45 and 45 are respectively provided on the front side and the opposite side in FIG. As the connecting member, for example, one or more of detachable connecting members such as eyebolts and shackles with screws can be used.

  The main pipe 4 having the above-described configuration is hung up and down along the leader 3 in the same manner as the conventional casing pipe shown in FIG. A vibro hammer (not shown) is connected to the upper end side of the main pipe 4. The vibratory hammer and the main pipe 4 are moved up and down in the same manner as in the prior art by a winch (not shown) provided in the hull.

  A sub pipe 5 (hollow tube) that forms a lower portion of the casing pipe is formed to have the same diameter as the main pipe 4, and includes a flange portion 51 provided on the upper end side, and a lower portion of the flange portion 51. In the vicinity of the side, there are upper connecting members 53 and 53 fixed to the outer wall. In the present embodiment, the upper connecting members 53 and 53 are provided on the front side of the sheet of FIG. By connecting the sub pipe 5 to the lower end side of the main pipe 4 described above, a long casing pipe similar to the conventional one is formed.

The sub-pipe 5 having the above-described configuration is suspended alongside the main pipe 4 as shown in FIG. 1 when the sand pile driving ship 1 moves (when moving to the site and when lifting from the site). . In the example shown in FIG. 1, the sub-pipe 5 is suspended by the main pipe 4 via the suspension wire 11 so as to be held by the main pipe 4. In the present invention, the configuration of the suspension wire 11 is not particularly limited, and a wire with a chain block may be used as necessary.
On the other hand, when arriving at the work site and starting the ground improvement work, the sub pipe 5 is connected to the lower side of the main pipe 4 to form a casing pipe.

  The pipe keeper portion 7 provided on the bow side of the sand pile driving vessel 1 has an opening 71 that leads to the sea surface (see FIG. 3). The opening 71 has a shape and size through which the main pipe 4 and the sub pipe 5 in a state of being suspended in a line (state shown in FIG. 1) can be inserted. Around the opening 71, there are four anti-sway devices (stern side anti-skid device 8 a, right side anti-sway device 8 b, left side anti-sway device) for preventing the casing pipe 6 moving up and down through the opening 71. A device 8c and a bow side anti-shake device 8d) are provided.

  The four bracing devices 8a to 8d respectively include bracing tires (support members) 81a to 81d that contact the outer wall of the casing pipe, and tire fittings (support member fittings) 83a to 83d on which the bracing tires are mounted. And have. As shown in FIGS. 2 and 3, the tire mounting hardware 83 a of the stern side stabilization device 8 a is fixed on the base in front of the reader 3. The tire fittings 83b and 83c of the right side bracing device 8b and the left side bracing device 8c are fixed on the keeper moving girders 21 and 22 that are installed.

  As shown in FIG. 4, the tire mounting bracket 83 d of the bow side anti-seismic device (movable anti-seismic device) 8 d is fixed on the H-section steel 23 while being pivotally supported by a pin 84. ing. Therefore, the bow side anti-shake device 8d is freely displaced (rotated) between the “stabilizing position” indicated by the solid line in FIG. 4 and the “opening position (opening opening position)” indicated by the phantom line in FIG. ).

  Further, as shown in FIG. 4, the tire mounting bracket 83d of the bow side anti-shake device 8d has a plurality of pieces (pin side piece 85, bottom piece 86, pipe side piece 87) for attaching the chain block. Yes. Two each of the pin side piece 85, the bottom piece 86, and the pipe side piece 87 are provided and arranged on the near side and the far side in FIG. These pieces 85 to 87 are connected to any one or more of the hulls of the main pipe 4, the sub pipe 5, and the sand pile driving ship 1 through a chain block when rotating the tire mounting hardware 83d. It is like that.

  When the bow side detent device 8d having the above-described configuration is in the “open position”, the main pipe 4 and the sub pipe 5 suspended side by side can be inserted into the opening 71 as shown in FIG. On the other hand, when the bow side restraint device 8d is in the “stabilizing position”, the casing pipe swings up and down through the opening 71 because it protrudes above the opening 71 (see FIGS. 2 and 3). Can be prevented.

  In the swaying position, a pin-shaped rotation restricting member 88 is set on the tire mounting bracket 83d of the bow side swaying device 8d. Thereby, the bow side anti-shock device 8d is prevented from rotating as the casing pipe moves up and down during the ground improvement work.

  On the H-section steel 23 on which the tire mounting hardware 83d is fixed, tire mounting hardware raising / lowering pieces 25, 25 are integrally provided as shown in FIG. On another H-section steel 24 that supports the H-section steel 23, pipe drawing pieces 26 and 26 are integrally provided. The other ends of the chain blocks connected to the main pipe 4 or the sub-pipe 5 are connected to these pieces 25 and 26 at the time of assembling and disassembling the casing pipe described later.

[Outline of sand pile placing process]
Next, a method for placing a sand pile on the seabed ground using the above-described sand pile placing ship 1 will be described.

  In placing a sand pile on the seabed ground, the sand pile placing ship 1 is first moved to the construction site. At this time, the main pipe 4 and the sub-pipe 5 are arranged in a suspended state as shown in FIG. When arriving at the construction site (site sea area), the main pipe 4 and the sub pipe 5 are joined together to assemble the casing pipe.

  And the seabed ground in a construction site is improved by creating a sand pile using this casing pipe. When the construction is completed, the casing pipe is disassembled into the main pipe 4 and the sub-pipe 5 and suspended in a juxtaposed state, and then pulled up in the same state as when moving to the construction site.

[Assembly procedure of casing pipe (procedure upon arrival at site)]
Next, a procedure for assembling the casing pipe when arriving at the construction site will be described in detail with reference to FIGS.
Hereinafter, the assembly procedure of the casing pipe will be described in order in relation to the steps (A) to (O) shown in FIGS.

<Step A> FIG. 5A is a reduced view of FIG. 1 and shows a state before arrival at the construction site. Until the arrival at the site, the main pipe 4 and the sub pipe 5 are connected by two suspension wires 11 and 11 as shown in FIG.

<Process B> When arriving at the construction site, first, the main pipe 4 is unwound. Then, since the sub pipe 5 is held by the main pipe 4, the main pipe 4 and the sub pipe 5 are integrally inserted through the opening 71 of the pipe keeper portion 7 while maintaining the juxtaposed state shown in FIG. 1. Then, when part of the main pipe 4 and the sub pipe 5 is submerged to a predetermined depth as shown in FIG. 5B, the lowering operation is stopped. Subsequently, the chain block (a) 13 is attached to each of the upper connecting members 53, 53 of the sub-pipe 5, and one end is left free (one is attached to the front side of the drawing, and the other is attached to the opposite side). . Similarly, the chain block (b) 15 is attached to each of the upper connecting members 53 and 53 of the sub-pipe 5, and one end is left free.

<Step C> The main pipe 4 is lowered again, and the main pipe 4 and the sub pipe 5 are lowered about 1.5 m from the state shown in FIG. 5B while maintaining the juxtaposed state. Next, the hooks at the other ends of the chain blocks (a) 13 and 13 are respectively taken into pipe drawing pieces 26 and 26 fixed on the H-section steel 24 (see FIG. 3).

<Step D> The main pipe 4 is unwound from the state shown in FIG. When the entire load of the sub-pipe 5 is applied to the chain blocks (a) 13 and 13 and the load of the suspension wires 11 and 11 is lost, only the suspension wire (the side connected to the main pipe 4) is removed.

<Step E> The main pipe 4 is wound up while the sub pipe 5 is inserted through the opening 71. At this time, since the main pipe 4 is not connected to the suspended sub pipe 5, only the main pipe 4 rises. At a position where the flange portion and the connecting member or the flange portions interfere with each other, the pull-in wire 17 is attached to the main pipe 4 as shown in FIG. .

<Step F> The other ends of the chain blocks (b) 15, 15 are attached to the lower connecting members 43, 43 of the main pipe 4. Note that one ends of the chain blocks (b) 15 and 15 are already attached to the upper connecting members 53 and 53 of the sub-pipe 5 in the step (B).

<Step G> The main pipe 4 is wound up while loosening the chain blocks (b) 15 and 15. At that time, the main pipe 4 is wound up until the flange portion 41 of the main pipe 4 is positioned higher than the flange portion 51 of the sub-pipe 5. The pull-in wire 17 is removed as necessary.

<Process H> The chain blocks (b) 15 and 15 that connect the main pipe 4 and the sub pipe 5 are operated, and the chain blocks (a) 13 and 13 are stretched until there is no load. At this time, the chain blocks (a) 13 and 13 are loosened at the same time. In this process, the sub-pipe 5 moves in the lateral direction (direction from the bow toward the stern) while being inserted through the opening 71, and is drawn toward the leader 3. Eventually, the sub pipe 5 is suspended while only the chain blocks (b) 15 and 15 connected to the main pipe 4 are loaded.

<Step I> When the chain blocks (a) 13, 13 are no longer loaded, one end of the chain block (a) is removed at the pipe drawing pieces 26, 26. At this time, the sub-pipe 5 is located directly below the main pipe 4 (that is, the main pipe 4 and the sub-pipe 5 are set in a coaxial state). Subsequently, the main pipe 4 is wound up as necessary.

<Step J> By the operation of the chain blocks (b) 15 and 15 and the winding operation of the main pipe 4, the whole of the main pipe 4 and the sub-pipe 5 aligned at the coaxial position are wound up. Then, the chain blocks (a) 13, 13 and the suspension wires 11, 11 are removed.

<Step K> The chain blocks (b) 15 and 15 are operated to lift the sub pipe 5 while maintaining the coaxial state, and the main pipe 4 and the flange portions 41 and 51 of the sub pipe 5 are brought into contact with each other to be connected. Thereby, a casing pipe 6 composed of the main pipe 4 and the sub pipe 5 is formed.

<Step L> The chain blocks (b) 15 and 15 are removed from the upper connecting member 53 of the sub-pipe 5. Thereafter, the casing pipe 6 is slightly lowered, and the removed side of the chain blocks (b) 15 and 15 is attached to the bottom pieces 86 and 86 of the tire fitting 83d (see FIG. 4).

<Process M> The chain blocks (b) 15 and 15 that connect the casing pipe 6 (main pipe 4) and the bottom pieces 86 and 86 are wound, and the tire mounting hardware 83d is rotated by the pulling force (reverse direction in the figure). Clockwise rotation). When the tire mounting hardware 83d rotates about 45 ° and reaches the position shown in FIG. 8M, the winding operation of the chain blocks (b) 15 and 15 is stopped. Next, for each of the chain blocks (a) 13 and 13, one end side is taken up by the raising / lowering piece 25 on the H-shaped steel 23, and the other end side is taken up by the pin side piece 85 of the tire mounting bracket 83d.

<Step N> After the step M, the chain blocks (a) 13 and 13 and the chain blocks (b) 15 and 15 are finely operated, and when the tire mounting hardware 83d is further rotated by about 10 °, the tire mounting hardware 83d. Falls down naturally due to its own weight. When only the chain blocks (a) 13, 13 are loaded, the chain blocks (b) 15, 15 are removed.

<Step O> After the chain blocks (b) 15 and 15 are removed, the chain blocks (a) 13 and 13 are loosened until the tire mounting hardware 83d is deposited in the pipe keeper portion 7. Then, when the anti-rotation position shown in FIG. 2 is reached, the pin-shaped rotation preventing member 88 is finally inserted as shown in FIG.

  The assembly operation of the casing pipe 6 formed by joining the main pipe 4 and the sub pipe 5 is completed through the above-described steps A to O. Thereafter, a sand pile is created using the casing pipe 6 in the same procedure as before, and the seabed ground at the construction site is improved.

[Disassembling procedure of casing pipe (procedure when lifting from the site)]
Next, a procedure for disassembling the casing pipe when pulling up from the construction site will be described in detail with reference to FIGS.
Hereinafter, the disassembling procedure of the casing pipe will be described in order in relation to the steps (a) to (n) shown in FIGS.

<Process a> When finishing the sand pile and lifting it from the site, the casing pipe 6 is disassembled into the main pipe 4 and the sub pipe 5. In starting the disassembling work, first, the pin-shaped rotation restricting member 88 set on the tire mounting hardware 83d is pulled out. As a result, the tire mounting hardware 83d is in a freely rotatable state.

<Step b> The casing pipe 6 is wound down about 2.5 m from the state shown in FIG. Subsequently, two chain blocks (b) 15 are prepared, and one end is hung on the lower connecting members 43 and 43 of the main pipe 4, and the other end is hung on the pipe side pieces 87 and 87 of the tire mounting hardware 83d. Further, two chain blocks (a) 13 are prepared, one end is hung on the raising and lowering pieces 25 and 25 fixed on the H-shaped steel 23, and the other end is pin-side piece 85 of the tire mounting hardware 83d. , 85.

<Step c> The casing pipe 6 is rolled up about 30 cm from the state shown in FIG. 9B, and the tire mounting hardware 83 d is floated through the chain blocks (b) 15 and 15. When the tire mounting hardware 83d floats and the chain operation becomes easy, the chain blocks (a) 13, 13 stretched between the raising and lowering pieces 25, 25 and the pin side pieces 85, 85 are replaced with the tire mounting hardware 83d. Start to wind according to the floating condition.

<Step d> The chain blocks (a) 13 and 13 are continuously wound until the tire mounting hardware 83d rotates about 80 ° (clockwise in the drawing). At this time, the chain blocks (b) 15 and 15 are loosened according to the degree of winding of the chain blocks (a) 13 and 13, and at an appropriate timing, one end side of the chain blocks (b) 15 and 15 is connected to the pipe side piece 87. , 87 to the bottom piece 86, 86.

<Step e> After the step d, the chain blocks (b) 15 and 15 and the chain blocks (a) 13 and 13 are finely operated. Then, when the rotation of the tire mounting bracket 83d exceeds about 85 ° and the tire mounting bracket 83d naturally falls down by its own weight, only the chain blocks (b) 15 and 15 are loaded. . When this state is reached, the chain blocks (a) 13, 13 are removed.

<Step f> After the chain blocks (a) 13 and 13 are removed, the chain blocks (b) 15 and 15 are kept loose until the tire mounting hardware 83d is deposited in the pipe keeper portion 7.

<Step g> When the tire mounting hardware 83d is deposited in the pipe keeper portion 7, the chain blocks (b) 15 and 15 are removed from the bottom pieces 86 and 86, and the casing pipe 6 is wound up by about 1.7 m. Next, the removed side of the chain blocks (b) 15, 15 is replaced with the upper connecting members 53, 53 of the sub-pipe 5. Then, the connected state of the flange portions 41 and 51 is released and the chain blocks (b) 15 and 15 are operated so that the casing pipe 6 (sub-pipe 5) is inserted through the opening 71 and the main pipe 4 to the sub-pipe 5 Release. As a result, the casing pipe 6 is separated into the main pipe 4 and the sub pipe 5, and the joint state between the two is released.

<Process h> Two chain blocks (a) 13 are prepared again, one end is taken by the upper connecting members 53 and 53 of the sub-pipe 5, and the other end is fixed to the H-shaped steel 24 and the pipe drawing piece 26, Take 26. Further, two suspension wires 11 are prepared, one end is hung on the upper connecting members 53 and 53 of the sub-pipe 5 and the other end is left free.

<Step i> The chain blocks (a) 13, 13 are wound up while loosening the chain blocks (b) 15, 15 connecting the main pipe 4 and the sub pipe 5. In this process, the sub-pipe 5 moves in the lateral direction (in the direction from the stern toward the bow) while being inserted through the opening 71, and is drawn into the tire mounting hardware 83d side.

<Step j> After the sub pipe 5 is suspended from the pipe keeper portion 7 via the chain blocks (a) 13 and 13, the main pipe 4 is wound about 1.5 m. Next, the chain blocks (b) 15 and 15 are removed on the main pipe 4 side.

<Step k> Subsequently, the main pipe 4 is lowered while the sub pipe 5 inserted through the opening 71 is suspended. At that time, at the position where the flanges 41 and 51 intersect with each other, the pull-in wire 17 is attached to the main pipe 4 and pulled slightly toward the leader 3 side. Through the steps h to k, the main pipe 4 and the sub-pipe 5 that are not joined are set in a juxtaposed state.

<Step l> The other ends of the suspension wires 11 and 11 are hung on the upper connection members 45 and 45 of the main pipe 4 to connect the main pipe 4 and the sub-pipe 5 in the juxtaposed state (one end of the suspension wires 11 and 11 is (It is hung on the sub pipe 5 side in step h). Subsequently, the chain blocks (a) 13 and 13 are lowered, and when the load of the sub pipe 5 is applied to the suspension wires 11 and 11 and the chain blocks (a) 13 and 13 are no longer loaded, the chain block (a) is removed. .

<Process m> The main pipe 4 holding the sub pipe 5 is wound up by about 1.5 m. Next, the chain blocks (b) 15, 15 are removed.

<Step n> The main pipe 4 and the sub-pipe 5 that have been partially submerged are pulled up above the water surface, and set in the same juxtaposed state as when arriving at the site.

  The disassembling work of the casing pipe 6 formed by joining the main pipe 4 and the sub pipe 5 is completed through the steps a to n described above.

[Excellent effect achieved by the present invention]
According to the present invention described above, when moving to the construction site and when lifting from the site, the long casing pipe is divided into a plurality of pipes.
Further, the main pipe 4 and the sub pipe 5 that are suspended in a line (bundled state) can be inserted into the opening 71 of the pipe keeper 7. Therefore, by performing a predetermined raising / lowering operation on the main pipe 4 and a lateral movement in the opening 71 of the inserted sub-pipe 5 at an appropriate timing, the entire long casing pipe is not pulled up on the ship. The casing pipe can be assembled and disassembled while being partially submerged. And since it is not necessary to pull up the whole long casing pipe on board, it becomes possible to make the height of a leader lower compared with the past.
And, as a result of equipable split casing pipe and short leader, it will be able to navigate under the roads and bridges built on the sea without any problems, and also move according to the height restrictions around the construction site You can also. In addition, since the long casing pipe necessary for ground improvement is assembled at the construction site, it is possible to meet the demand for deep ground improvement without any problems while observing the height restriction.

  The present invention provides a sand pile driving ship that enables deep ground improvement and enables safe and smooth movement while observing the height restrictions prescribed for the surrounding area of the construction site. It is suitable for doing. Moreover, this invention is suitable for providing the driving method of the sand pile using such a sand pile driving ship.

It is a side view which shows partially the bow side of the sand pile driving ship (state at the time of movement) concerning the present invention. It is a side view which expands and shows the bow side of the sand pile driving ship (state at the time of ground improvement work) which concerns on this invention. It is a top view which shows a part of sand pile driving ship of FIG. It is an enlarged view which shows the movable anti-vibration apparatus which the sand pile driving ship of FIG. It is a figure which shows a part of assembly procedure of the casing pipe at the time of construction site arrival. FIG. 6 is a diagram showing a part of the procedure for assembling the casing pipe when arriving at the construction site, and shows a continuation of FIG. 5. It is a figure which shows a part of assembly procedure of the casing pipe at the time of construction site arrival, Comprising: The continuation of FIG. 6 is shown. It is a figure which shows a part of assembly procedure of the casing pipe at the time of construction site arrival, Comprising: The continuation of FIG. 7 is shown. It is a figure which shows a part of decomposition | disassembly procedure of the casing pipe at the time of pulling up from a construction site. It is a figure which shows a part of disassembly procedure of the casing pipe at the time of pulling up from a construction site, Comprising: The continuation of FIG. 9 is shown. It is a figure which shows a part of disassembly procedure of the casing pipe at the time of pulling up from a construction site, Comprising: The continuation of FIG. 10 is shown. It is a figure which shows a part of disassembly procedure of the casing pipe at the time of pulling up from a construction site, Comprising: The continuation of FIG. 11 is shown. It is a figure which shows the conventional sand pile driving ship.

DESCRIPTION OF SYMBOLS 1 Sand pile driving ship 3 Leader 4 Main pipe 5 Sub pipe 6 Casing pipe 7 Pipe keeper part 8a Stern side rocking device 8b Right rocking device 8c Left rocking device 8d Bow side rocking device (movable rocking device)
11 Hanging wire 13 Chain block (a)
15 Chain block (b)
17 Pull-in wire 21 Keeper moving girder 22 Keeper moving girder 23 H-section steel 24 H-section steel 25 Tire mounting hardware raising / lowering piece 26 Pipe drawing-in piece 41 Flange portion 43 Lower connecting member 45 Upper connecting member 51 Flange portion 53 Upper connecting portion Member 71 Opening 81a Anti-rest tire (support member)
81b Anti-rest tire (support member)
81c Anti-rest tire (supporting member)
81d Anti-rest tire (support member)
83a Tire mounting hardware (supporting member mounting hardware)
83b Tire mounting hardware (supporting member mounting hardware)
83c Tire mounting hardware (supporting member mounting hardware)
83d Tire mounting hardware (supporting member mounting hardware)
84 Pin 85 Pin side piece 86 Bottom piece 87 Pipe side piece 88 Pin-shaped rotation restricting member 100 Conventional sand pile placing ship 101 Leader 103 Casing pipe 105 Vibro hammer 107 Winch 109 Pipe keeper

Claims (2)

Equipped with a plurality of pipes that can form a casing pipe by joining together, suspending the pipes side by side when moving, and sand pile driving ship that joins the pipes together as a casing pipe during ground improvement work,
The pipes suspended side by side can be inserted, and an opening that leads to the sea surface;
A movable bracing device that is displaceable between an open position that allows insertion of the pipe suspended in parallel to an opening portion and a bracing position that prevents the casing pipe from shaking;
The movable anti-vibration device is
A support member for supporting the casing pipe from the outer wall side;
The support member is mounted, and a support member mounting bracket that is pivotally supported between the swinging position and the open position, and
A sand pile comprising: a rotation restricting member for preventing the movable anti-vibration device in the anti-rotation position from rotating as the casing pipe moves up and down during ground improvement work. A naval ship. The support member mounting hardware has a piece for mounting a chain block,
The sand pile according to claim 1 , wherein the piece is connected to at least one of the pipe and the hull via a chain block when the support member mounting hardware is rotated. A naval ship.

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