JP2004019113A - Ground improvement ship and ground improvement execution method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ground improvement ship and a ground improvement execution method capable of easily improving the ground such as an existing revetment without changing the direction of the hull of a ship, and without simultaneously using two execution methods. <P>SOLUTION: This ground improvement ship 1 is characterized in that a turntable 3 is arranged in the hull 2, and a ground improvement device 4 is arranged on this turntable 3. The ground improvement device 4 is composed of a leader 7 installed on the turntable 3 by projecting from the hull 2, a lifting chain 9 extended to upper-lower sprockets 8 of the leader 7, a lift 10 connected to the lifting chain 9, a slurry injecting rod 11 suspended by and arranged in the lift 10, an agitating head 12 connected to a tip part of the rod 11 and a driving device 13 of a leader lower part for rotating the agitating head 12. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a ground improvement ship and a ground improvement method.
[0002]
[Prior art]
As shown in (1) and (2) of FIG. 12, the ground improvement such as the existing revetment is performed by improving the ground on the near side of the existing revetment 56 while changing the direction of the ground improvement ship 55 by a mechanical stirring method. The ground in contact with the existing quay 56 was improved by high-pressure injection. In this high-pressure injection construction method, the plane position of the high-pressure injection section 57 is measured with high accuracy, and the positional relationship between the high-pressure injection section 57 and the standard discharge section 58 is accurately grasped to position the construction machine. Also, as shown in (3), a hole for inserting the rod 61 was opened in the existing revetment 60 having the overhang 59.
[0003]
[Problems to be solved by the invention]
However, the above-described ground improvement has the following problems.
(1) The hull could not be improved in two directions unless the hull was changed to a 90 degree direction, and there was an unimproved part in the corner. (2) Since the hull was fixed by the anchor winch method using the operating winch, it was already installed. (3) In the case of (2) above, the anchorage was small in the seawall direction because the hull was fixed to the mooring bit of the existing seawall with a wire rope. Since the construction method was used in combination, construction was troublesome and deviations were likely to occur in the improvement accuracy. (5) The insertion hole of the injection rod had to be opened in the revetment with an overhang. (6) Conventional ground improvement Since the ship had a drive unit on the upper part of the rod, the center of gravity was high and the ship was not stable.
The present invention has been made in view of the above-described problems, and has an object to improve a ground such as an existing revetment easily without changing the direction of a hull and without using two construction methods. To provide ship and ground improvement methods.
[0005]
[Means for Solving the Problems]
The gist of the ground improvement ship of the present invention for achieving the above object is characterized in that a turntable is provided on a hull, and a ground improvement device is installed on the turntable. Also, the ground improvement device is mounted on a leader protruding from the hull and attached to a turntable, an elevating chain suspended over sprockets above and below the leader, an elevator connected to the elevating chain, and suspended from the elevator. A rod for slurry injection, a stirring head connected to the tip of the rod, and a driving device below the reader for rotating the stirring head. It also includes that the leader is rotatable about a turntable joint. Further, the ground improvement device includes any one of a sand drain driving device, a paper drain driving device, a ground excavation or a stirring device. The rotation axis of the stirring head includes an outer pipe having a slurry discharge port and an inner pipe to which a high-pressure injection pipe is connected. The hull also includes a vertical spud carriage that moves in the front-rear direction and a horizontal spud carriage that moves in the horizontal direction.
[0006]
The gist of the ground improvement method is that the ground improvement equipment is installed on the turntable of the hull, a vertical spud carriage that moves in the longitudinal direction, and a ground improvement ship that has a horizontal spud carriage that moves in the horizontal direction. The method is characterized in that the hull is moved or fixed by at least a vertical spud carriage or a horizontal spud carriage, and the ground is improved by a ground improvement device while rotating the turntable. Further, the ground improvement device is provided with a leader protruding from the hull and attached to a turntable, an elevating chain suspended over sprockets above and below the leader, an elevator attached to the elevating chain, and suspended from the elevator. A rod for injecting slurry, a stirring head connected to the tip of the rod, and a driving device below the reader for rotating the stirring head.
[0007]
Ground improvement within a rotation angle range of at least 180 degrees can be performed without changing the direction of the hull, and unreformed portions in corners can be reduced. By turning the turntable, the ground can be improved in a plane curved area. Since the leader can rotate around the joint, the verticality of the leader can be easily adjusted. Since the two methods, the mechanical stirring method and the high-pressure injection method, can be performed coaxially, there is no misalignment during construction of the improved pile, and the improvement error can be eliminated. Even if the stirring head is placed at a position distant from the existing revetment, the slurry can be injected at a high pressure, so that the ground in contact with the existing revetment can be improved. Since the hull is moved or fixed between the vertical spud carriage and the horizontal spud carriage, the anchoring range of the anchor is narrowed, and the obstacle of the navigating ship can be reduced. The ground can be improved to a plane curved area or a plane circular area by a small movement of the hull. The center of gravity is lowered and the hull is stabilized by the driving device provided below the rod.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of a ground improvement ship and a ground improvement method of the present invention will be described with reference to the drawings. First, a ground improvement ship will be described, and then a ground improvement method using the ground improvement ship will be described.
[0009]
1 and 2 show a ground improvement ship 1. FIG. The ground improvement ship 1 includes a ground improvement device 4 installed on a turntable 3 on a deck of a hull 2, a vertical spud carriage 5 installed on both sides of the hull 2, and a horizontal spud carriage 5 installed on front and rear portions of the hull. And a spud carriage 6 for use. The end of the hull where the turntable 3 is installed is formed in a curved shape like the turntable 3.
[0010]
The ground improvement device 4 forms a pile on soft ground, and as shown in FIG. 3, a leader 7 attached to a turntable 3 and a lifting chain suspended over sprockets 8 above and below the leader 7. 9, a lift 10 attached to the lift chain 9, two rods 11 for pouring slurry suspended from the lift 10, a stirring head 12 connected to a tip end of the rod 11, And a driving device 13 for rotating the stirring head 12.
[0011]
The leader 7 is attached to the turntable 3 via the joint 14 while projecting from the hull 2, that is, positioned above the water, and the verticality can be adjusted by rotating around the joint 14 by the expansion and contraction of the cylinder 16 at the stay 15. It has become. The elevating chain 9 is rotated by a chain driving device 17 installed below the leader 7, and an elevating machine 10 connected to the elevating chain 9 moves up and down. The elevating chain 9 can be replaced with a wire rope.
[0012]
The two rods 11 suspended by the elevator 10 can be rotated by a driving device 13 installed on a worktable 18 of the turntable 3. By disposing the driving device 13 below the worktable 18, the center of gravity is lowered and the hull is stabilized.
[0013]
The rod 11 is a hollow tube having a rectangular cross section. The upper portion of the rod 11 is rotatably connected to a support frame 20 via a rotation shaft 19, and is inserted through a hole 23 of a gear 22 rotated by a motor 21 of a driving device. I have. Therefore, the rod 11 is moved up and down while rotating by the driving of the motor 21 and the elevation of the elevator 10. An outer pipe 24 for injecting slurry and an inner pipe 25 provided in the outer pipe 24 are connected to the rod 11, and these are connected to an outer passage 27 of a slurry injecting apparatus 26 forming a double swivel joint. It is connected to the inner tube 28.
[0014]
On the other hand, the stirring head 12 connected to the rod tip is composed of a cutting blade 30 at the tip of the rotating shaft 29 and a stirring blade 31 at the upper part. An outer passage 32 connected to the outer tube 24 of the rod and a high-pressure inner tube 33 connected to the inner tube 25 of the rod are provided in the rotating shaft 29, and a discharge port 34 is formed in the outer passage 32. The injection pipe 35 is connected to the high-pressure inner pipe 33. Therefore, the slurry injected from the injection port 36 of the slurry injection device 26 is discharged from the discharge port 34 of the rotating stirring head 12 through the outer passage 27 and the outer pipe 24 of the rod, and injected from the high-pressure injection port 37. The slurry thus obtained is also high-pressure injected from the injection pipe 35 through the high-pressure inner pipe 28 and the rod inner pipe 25.
[0015]
FIG. 8 shows a vertical spud carriage 5 which moves in the longitudinal direction of the hull 2 or a horizontal spud carriage 6 which moves in the width direction of the hull 2. It comprises a movable traveling vehicle 40 installed on the traveling vehicle 39 and a spud 41 installed on the traveling vehicle 40. The spud 41 descends by its own weight and is driven into the seabed, and rises when the lifting wire 43 stretched over the sheave 42 is pulled by the lifting winch 44. On the other hand, the traveling carriage 40 travels by rotating the traveling chain 45 in the forward and reverse directions by the traveling motor 46. Therefore, the ground improvement is performed while operating or moving the vertical and horizontal spud carriages 5 and 6 to move or fix the hull 2.
[0016]
Next, a ground improvement method using the ground improvement ship 1 will be described. First, after moving the ground improvement ship 1 to the ground improvement point, the vertical spud carriage 5 and the horizontal spud carriage 6 are driven into the soft seabed ground 47 as shown in FIG. And fix it horizontally.
[0017]
Next, the drive unit 13 and the chain drive unit 17 are driven to excavate the submarine ground 47 while rotating and lowering the stirring head 12. Then, when the slurry 49 or 50 such as cement-based solidifying material is injected from the injection port 36 and the high-pressure injection port 37 of the slurry injection device 26, the slurry 49 and 50 are passed through the outer passages 27 and 32 and the inner pipes 25 and 33, and the stirring head 12 Is discharged from the discharge port 34 and the injection pipe 35. The slurry 49 from the discharge port 34 is mixed with the excavated soil 51, and the slurry 50 from the injection pipe 35 is injected at high pressure outside the excavated soil 51. Therefore, even if the stirring head 12 is located at a position appropriately separated from the existing revetment 48, as shown in FIG. 11, the ground 47 in contact with the existing revetment 48 can be improved.
[0018]
By operating the vertical spud carriage 5 and the horizontal spud carriage 6 in this manner, the ground 47 along the existing revetment 48 is improved while sequentially moving and fixing the hull 2. Then, when the corner portion of the existing revetment 48 as shown in FIG. 12 is improved to a plane curved area by rotating the turntable 3, the unimproved portion is reduced.
[0019]
In addition, the ground improvement method can improve the ground to a plane circular shape only by slightly changing the direction of the hull 2 in addition to the ground 47 as described above.
[0020]
The ground improvement device 4 of the ground improvement ship 1 is not limited to the above-described one, and may be any one of a sand drain driving device, a paper drain driving device, a ground excavation device, and a stirring device.
[0021]
【The invention's effect】
Ground improvement within a rotation angle range of at least 180 degrees can be performed without changing the direction of the hull, and unreformed portions in corners can be reduced.
[0022]
By turning the turntable, the ground can be improved in a plane curved area.
[0023]
Since the leader can rotate around the joint, the verticality of the leader can be easily adjusted.
[0024]
Since the two methods, the mechanical stirring method and the high-pressure injection method, can be performed coaxially, there is no misalignment during construction of the improved pile, and the improvement error can be eliminated.
[0025]
Even if a stirring head is placed at a position distant from the existing revetment, high-pressure injection of the improving liquid can be performed, so that the ground in contact with the existing revetment can be improved.
[0026]
The center of gravity is lowered and the hull is stabilized by the driving device provided below the rod.
[0027]
Since the hull is moved or fixed between the vertical spud carriage and the horizontal spud carriage, the anchoring range of the anchor is narrowed, and the obstacle of the navigating ship can be reduced.
[0028]
The ground can be improved in two directions and corners without changing the direction of the hull.
[0029]
The ground can be improved to a plane curved or circular shape with a slight movement of the hull.
[Brief description of the drawings]
FIG. 1 is a front view of a ground improvement ship.
FIG. 2 is a plan view of the ground improvement ship.
FIG. 3A is a front view of a ground improvement device, and FIG. 3B is a cross-sectional view.
FIG. 4A is a front view of a ground improvement device, and FIG. 4B is a conceptual diagram showing a transmission mechanism of a driving device.
FIG. 5 is a partially cutaway sectional view of a slurry injection device to which a rod is attached.
FIG. 6 (1) is a front view of a stirring head, and (2) is a bottom view of a cutting blade.
FIG. 7 is a sectional view of a stirring head.
FIG. 8 shows a spud carriage, wherein (1) is a plan view, (2) is a longitudinal sectional view, and (3) is a transverse sectional view.
FIG. 9 is a perspective view showing a ground improvement method using a ground improvement ship.
FIG. 10 is a perspective view in which slurry is injected at a high pressure from a stirring head.
FIG. 11 is a sectional view of FIG. 10;
FIG. 12 shows a conventional ground improvement method, (1) is a plan view of the ground improvement method, and (2) and (3) are cross-sectional views of the same.
[Explanation of symbols]
1,55 Ground improvement ship 2 Hull 3 Turntable 4 Ground improvement device 5 Vertical spud carriage 6 Horizontal spud carriage 7 Leader 8 Sprocket 9 Elevating chain 10 Elevator 11, 61 Rod 12 Stirring head 13 Drive unit 14 Joint 15 Stay 16 Cylinder 17 Chain drive device 18 Workbench 19 Rotary shaft 20 Support frame 21 Motor 22 Gear 23 Hole 24 Outer tube 25 Inner tube 26 Slurry injecting device 27, 32 Outer passage 28, 33 High-pressure inner tube 29 Rotary shaft 30 Cutting blade 31 Stirrer blade 34 Discharge port 35 Injection pipe 36 Injection port 37 High-pressure inlet 38 Elongated hole 39 Rail 40 Traveling trolley 41 Spud 42 Sheave 43 Lifting wire 44 Lifting winch 45 Traveling chain 46 Traveling motor 47 Ground 48, 56, 60 Existing seawall 49, 50 Slurry 51 Excavated soil 5 High-pressure injection construction part 58 standard discharge construction portion 59 projecting portion

Claims (8)

A ground improvement ship, wherein a turntable is provided on a hull, and a ground improvement device is installed on the turntable. The ground improvement device was mounted on a leader protruding from the hull and attached to a turntable, an elevating chain suspended over sprockets above and below the leader, an elevator connected to the elevating chain, and suspended from the elevator. The ground improvement ship according to claim 1, comprising a rod for injecting slurry, a stirring head connected to a tip portion of the rod, and a driving device below a leader for rotating the stirring head. . The ground improvement ship according to claim 2, wherein the leader is rotatable around a joint of the turntable. The ground improvement ship according to claim 1, wherein the ground improvement device is any one of a sand drain driving device, a paper drain driving device, a ground excavation or a stirring device. The ground improvement ship according to any one of claims 1 to 3, wherein the rotation shaft of the stirring head is constituted by an outer passage provided with a slurry discharge port, and a high-pressure inner pipe connected to an injection pipe. The ground improvement ship according to any one of claims 1 to 5, wherein the hull is provided with a vertical spud carriage that moves in the front-rear direction and a horizontal spud carriage that moves in the horizontal direction. A ground improvement method using a ground improvement ship provided with a ground improvement device installed on a turntable of a hull, a vertical spud carriage moving in a front-rear direction, and a horizontal spud carriage moving in a horizontal direction, at least a vertical spud. A ground improvement method comprising: moving or fixing a hull by a carriage or a horizontal spud carriage; and improving the ground by a ground improvement device while rotating the turntable. The ground improvement device was mounted on a leader protruding from the hull and attached to a turntable, an elevating chain suspended over sprockets above and below the leader, an elevator connected to the elevating chain, and suspended from the elevator. The ground improvement method according to claim 7, comprising a rod for injecting slurry, a stirring head connected to a tip portion of the rod, and a driving device below a leader for rotating the stirring head.

Images