JP2013142271A - Steel pipe sheet pile press-in method and press-in device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problems that noise or vibrations are generated at work site by a conventional installation method and that a steel pipe sheet pile cannot be pressed into hard soil since a press-in pressure during installation is limited by a conventional static pressure press-in construction method.SOLUTION: In a steel pipe sheet pile press-in method, a casing provided with an excavation body positioned at a lower peripheral edge is inserted from an upper part to an inner side of a steel pipe sheet pile having a joint on an outer periphery, a chuck device fixing an upper part of the casing is driven and rotated by a rotational drive unit, soil is dug and loosened by the excavation body of the casing while leaving sediment inside the casing, and the steel pipe sheet pile is pressed into the soil dug and loosened by the excavation body.

Description

  The present invention relates to a method for press-fitting a steel pipe sheet pile having a joint on the outer periphery and a press-fitting device.

Conventionally, a placing method that is performed by hitting an upper portion of a steel pipe sheet pile provided with a joint is known (Patent Document 1).
Conventionally, a medium digging press method in which a digging head is inserted into a casing, the inside of the casing is excavated and discharged by the excavating head, and a steel pipe sheet pile on the outer periphery of the casing is statically pressed into the ground (patented) Reference 2).

JP 2011-202450 A JP 2004-11102 A

Among the known examples, the former placement method has a problem of generation of noise or vibration at a work site.
Among the known examples, the medium digging hydrostatic press fitting method has a problem that the steel pipe sheet pile cannot be press-fitted in hard ground because the press-fit pressure at the time of placing is limited.
Moreover, in the known medium digging press-fitting method, there is a problem that the residual soil generated by excavation in the casing needs to be discharged.
The treatment of the remaining soil is difficult, expensive, and increases the installation cost of the steel pipe sheet pile.
In this application, a method of press-fitting a steel pipe sheet pile is devised to enable the press-fitting work of a steel pipe sheet pile on a hard ground without generating excavation residual soil.

According to the first aspect of the present invention, a casing provided with an excavating body located at the lower peripheral edge is inserted from above into a steel pipe sheet pile having a joint on the outer periphery, and a chuck device for fixing the upper portion of the casing is A steel pipe sheet pile press-in method in which the steel pipe sheet pile is press-fitted into the ground that has been driven and rotated to loosen the ground with the excavated body of the casing while leaving the earth and sand in the casing and is loosened with the excavated body.
In the invention of claim 2, the excavation body is moved from the lower peripheral edge of the casing to the lower peripheral edge of the steel pipe sheet pile, and the ground is dug and loosened by the excavation body below the peripheral edge of the steel pipe sheet pile. This is a steel pipe sheet pile press-in method for press-fitting a steel pipe sheet pile.
In the invention of claim 3, the excavation body located below the peripheral edge of the steel pipe sheet pile is moved radially outward at the lower portion of the joint, and the ground below the joint is loosened by the excavation body, After digging and loosening the ground below the joint, the drilling body is evacuated below the periphery of the steel pipe sheet pile until reaching the next joint, and only the ground below the steel pipe sheet pile and joint is digging and digging with the drilling body. The steel pipe sheet pile press-in method is used to press-fit the steel pipe sheet pile into the loosened ground.
The invention according to claim 4 is a drilling body provided at a predetermined position on the lower peripheral edge of the casing so as to freely enter and exit in the radial direction of the casing;
A chuck device for chucking the upper inner periphery of the casing;
A rotary drive device connected to the chuck device to drive and rotate the casing together with the excavation body;
A steel pipe sheet pile having a joint on the outer periphery, fitted to the outer periphery of the casing,
A steel pipe sheet pile press-in apparatus comprising a steel pipe chuck apparatus for chucking the lower part of the steel pipe sheet pile and a press-in apparatus having a steel pipe press-in cylinder for press-fitting the steel pipe sheet pile.
According to a fifth aspect of the present invention, the excavated body is rotatably attached to an attachment portion provided on the lower inner periphery of the casing by a shaft, and the entry / exit cylinder provided on the casing is used to insert the excavation body from below the inner periphery of the casing. It is a steel pipe sheet pile press-fitting device configured to advance and retract to the lower part of the joint.
The invention according to claim 6 is a steel pipe sheet pile press-fitting device in which the rotational drive device is configured with an outer diameter that can be inserted into the casing and is configured integrally with the chuck device.
According to a seventh aspect of the invention, the rotary drive device is mounted on the upper portion of the casing, and the casing is driven and rotated together with the chuck device chucked on the inner periphery of the upper portion of the casing by the rotation output shaft of the rotary drive device. Steel pipe sheet pile press-fitting device.
The invention of claim 8
The entry / exit cylinder and the rotary drive device are steel pipe sheet pile press-in devices configured to move the excavation body forward and backward in the radial direction only at the lower part of the joint to dig and loosen the ground.

According to the first aspect of the present invention, since the excavator 3 loosens the lower periphery of the casing 4 while leaving the earth and sand in the casing 4, the steel pipe sheet pile 2 can be press-fitted without generating excavated soil, and the casing Since the lower part of the peripheral edge of 4 is loosened by the excavating body 3, the press-fitting pressure of the steel pipe sheet pile 2 can be lowered as compared with the conventional one, not only can the press-fitting work be facilitated, but also the hard ground can be worked. The possible range can be expanded.
In the invention of claim 2, since the lower part of the peripheral edge of the steel pipe sheet pile 2 is loosened by the excavating body 3, the work of the hard ground can be further performed and the workable range can be expanded.
In the invention of claim 3, since the lower part of the peripheral edge of the steel pipe sheet pile 2 is dug loosened by the excavating body 3 and the ground below the joint 1 is dug loosened, the work of the hard ground can be further performed and the workable range is expanded. be able to. Furthermore, since only the ground below the steel pipe sheet pile 2 and the joint 1 is dug and loosened, the ground strength of the outer periphery of the steel pipe sheet pile 2 is not lowered, and the support rigidity of the steel pipe sheet pile 2 against the horizontal load is not lowered.
In the invention of claim 4, since the excavator 3 loosens the lower periphery of the steel pipe sheet pile 2 while leaving the earth and sand in the casing 4, the steel pipe sheet pile 2 can be press-fitted without generating residual excavation, and the steel pipe Since the bottom of the sheet pile 2 has been dug loosened by the excavated body 3, the work on the hard ground can be performed on the hard ground compared to the conventional one, and the workable range can be expanded.
In the invention of claim 5, the advancing / retreating mechanism of the excavated body 3 can be configured easily, failure or breakage can be prevented, and work efficiency can be improved.
In the invention of claim 6, since the rotary drive device 20 and the chuck device 22 are provided in the casing 4, the peripheral work space can be widened, and work in a narrow work site can also be made possible.
In the invention of claim 7, the rotation drive device 20 that is widely used can be arranged on the upper part of the casing 4 to drive and rotate the casing 4, so that the rotation can be performed without being limited by the inner diameter of the casing 4. The drive device 20 can be selectively mounted, and the device cost can be reduced.
In the invention of claim 8, since only the lower part of the joint 1 is dug and loosened, the surrounding ground strength is not lowered, and the support rigidity against the horizontal load of the steel pipe sheet pile 2 is not lowered.

The side view of a steel pipe sheet pile press-fitting device. The top view of the installed steel pipe sheet pile. The side view of a rotation drive device. The side view of a drilling body. The side view of a press-fit apparatus. FIG. Schematic diagram of press-fitting work. The side view of the other Example of the steel pipe sheet pile press-fitting device. The side view of the state which inserted the casing in the steel pipe sheet pile. The side view of the other Example of the steel pipe sheet pile press-fit apparatus provided in the work ship. The same part enlarged view.

The present invention relates to a method for press-fitting a steel pipe sheet pile 2 having at least a pair of joints 1, and an example of the press-fitting method and an apparatus for carrying out the method will be described with reference to the drawings.
The joint 1 only needs to connect the steel pipe sheet piles 2 to each other, and an example is shown in FIG. 2, but the shape and number of the joints 1 are not requirements of the present application.
Inside the steel pipe sheet pile 2, a casing 4 having an excavating body (excavating bit) 3 at the bottom is inserted from above. The casing 4 is formed to have an outer diameter that can be inserted into the steel pipe sheet pile 2 from above.

Next, by rotating the casing 4, the excavator 3 is rotated integrally with the casing 4, and the ground under the periphery of the casing 4 is dug loosened (disintegrated), and the casing 4 is hydrostatically pressed into the ground.
That is, when the casing 4 is simply press-fitted, earth and sand resistance is generated and a considerable press-fitting pressure is required. However, since the ground below the periphery of the casing 4 is dug loosened by the excavating body 3, the press-fitting pressure is reduced. Can be press-fitted.

  The excavated body 3 extends beyond the outer periphery from the inner peripheral position of the casing 4 to the inner periphery of the casing 4 so that the ground from the lower peripheral edge of the casing 4 to the lower peripheral edge of the steel pipe sheet pile 2 can be removed. It is configured to allow entry and exit between the lower periphery and the lower periphery of the joint 1, and the ground from the lower periphery of the casing 4 to the lower periphery of the joint 1 is dug and loosened.

In this case, since the joint 1 is only provided on a part of the outer periphery of the steel pipe sheet pile 2 (FIG. 2), the excavator 3 is not suitable if only the lower part of the joint 1 is dug and loosened. The ground around the steel pipe sheet pile 2 need not be destroyed, and the ground strength is not lowered, which is preferable.
For example, when the steel pipe sheet pile 2 passes through the lower part of the joint 1 by projecting and expanding from the position before the joint 1 to the lower part of the joint 1 beyond the outer diameter of the steel pipe sheet pile 2, the lower part of the outer diameter of the steel pipe sheet pile 2 is lowered. After evacuating to the position, the digging is loosened, and the next projecting and expanding below the joint 1 is performed to loosen the ground, and this is repeated.

The digging loosening by the excavating body 3 is preferably performed to such an extent that the steel pipe sheet pile 2 and the casing 4 can be press-fitted according to various conditions such as the hardness of the ground and moisture.
In other words, the excavated body 3 digs and loosens only below the peripheral edges of the joint 1, the steel pipe sheet pile 2, and the casing 4, and presses the steel pipe sheet pile 2 while leaving it in the casing 4 without discharging the earth and sand in the casing 4. By filling the steel pipe sheet pile 2 with earth and sand, the strength of the standing posture of the steel pipe sheet pile 2 is improved, and further, the ground around the steel pipe sheet pile 2 is not unnecessarily loosened. The holding strength of can be improved.

  Therefore, when it is easy to press-fit the steel pipe sheet pile 2 on soft ground, it may not be necessary to project the excavating body 3 toward the joint 1. On the other hand, in the case of hard ground, the bottom of the joint 1 is excavated. By loosening the digging with the body 3, the press-fitting work of the steel pipe sheet pile 2 may be possible, and by moving the excavating body 3 in and out, the work range can be expanded.

  The order of the press-fitting and loosening work by the casing 4 and the press-fitting work of the steel pipe sheet pile 2 is arbitrary, and the press-fitting and loosening work by the casing 4 and the press-fitting work of the steel pipe sheet pile 2 may be performed almost simultaneously. 4 may be performed prior to the press-fitting work of the steel pipe sheet pile 2.

Further, the casing 4 may be press-fitted by its own weight and digging of the excavated body 3.
Hereinafter, a specific example will be described. In FIG. 1, 10 is a ground traveling vehicle, and a table 12 is provided above a traveling device (crawler) 11. A leader 15 is attached to the tip of a stay 14 provided on the table 12. A vertical support part 16 is attached to the leader 15 so as to be movable up and down, and an upper part of a suspension body 17 is attached to the vertical support part 16, and a rotary drive device 20 is provided below the suspension body 17.

  The rotation drive device 20 is constituted by a motor, and a rotation output shaft 21 of the rotation drive device 20 is provided so as to protrude downward, and the chuck device 22 is rotated by the rotation output shaft 21. The chuck device 22 fixes the chuck body 23 in contact with the inner periphery of the casing 4, and drives and rotates the casing 4 by driving the rotation driving device 20.

  The configuration of the chuck device 22 may be such that the rotation output shaft 21 and the casing 4 are connected in a fixed state so that the driving force of the rotation driving device 20 is transmitted to the casing 4. Reference numeral 24 denotes a wedge-shaped guide body that allows the chuck body 23 to enter and exit, 25 denotes a chuck cylinder that moves the chuck body 23 up and down, and 26 denotes a chuck frame that is attached to the rotary output shaft 21.

  At the lower part of the casing 4, the excavated body 3 is provided so as to freely enter and exit in the radial direction. The excavated body 3 is attached to an attachment portion 28 provided on the lower inner periphery of the casing 4 so as to be rotatable by a shaft 29. The rod 31 of the entry / exit cylinder 30 is attached to the excavation body 3, and the upper part of the entry / exit cylinder 30 is attached to a cylinder attachment portion 32 provided on the inner periphery of the casing 4 in a fixed state.

The excavation body 3 is formed with a small thickness in the diameter direction and a width in the rotation direction of the casing 4 while ensuring the strength necessary for excavating the ground below the lower edge of the casing 4.
That is, the excavating body 3 is formed in a small size so that the ground around the steel pipe sheet pile 2 is not unnecessarily destroyed and the earth and sand are left in the steel pipe sheet pile 2 to omit the earth removal step.

  A press-fitting device 40 for press-fitting the steel pipe sheet pile 2 is provided below the leader 15. The press-fitting device 40 is installed on the ground by providing a support leg 42 on a support frame 41 having a square frame shape. The support frame 41 includes left and right left and right frames 43 and front and rear frames 44.

The support frame 41 is provided with a steel pipe chuck device 50 for fixing the steel pipe sheet pile 2. The steel pipe chuck device 50 is provided with a chuck body 52 which is fixed to the chuck frame 51 by being brought into contact with the outer periphery of the steel pipe sheet pile 2. Reference numeral 53 denotes a wedge-shaped guide body that allows the chuck body 52 to enter and exit, and 54 denotes a chuck cylinder that moves the chuck body 52 up and down.
Reference numeral 55 denotes a steel pipe press-fitting cylinder that moves the steel pipe chuck device 50 up and down, and is suspended from a cylinder frame 56.

  The steel pipe press-in cylinder 55 press-fits the steel pipe sheet pile 2 when the chuck frame 51 is lowered. However, when the chuck frame 51 is raised without the steel pipe sheet pile 2 attached, the support frame 41 and the support leg 42 are provided. The press-fitting device 40 is lifted together to bring the press-fitting device 40 into a transporting movement state.

FIGS. 8 and 9 show another embodiment, in which the chuck device 22 of the rotary drive device 20 is inserted into the upper portion of the casing 4 for chucking, and the casing 4 is rotated.
Reference numeral 60 denotes a pendant rope, which is used when the leader 15 is raised from a horizontal state. 61 is a rotation drive part suspension wire.

  Further, since it is assumed that the sand and sand in the steel pipe sheet pile 2 is left without being discharged, the chuck device 22 is inserted into the upper portion of the casing 4 so that the rotary drive device 20 is placed on the upper portion of the casing 4. Similarly, the rotary drive device 20 is also chucked by the chuck device 22 at the inner periphery of the upper portion of the casing 4 at a predetermined distance from the excavated body 3.

10 and 11 show another embodiment, in which the table 12 is provided on the work boat 65, a leader 15 is attached to the tip of the stay 14 provided on the table 12, and the rotation drive device for the casing 4 is attached to the leader 15. 20 is provided.
A press-fitting device 40 for press-fitting the steel pipe sheet pile 2 is provided below the leader 15.

(Operation of Example)
The press fitting device 40 is transported to the installation site of the steel pipe sheet pile 2 by the ground traveling vehicle 10 or the work boat 65, and the steel pipe sheet pile 2 is suspended by a crane (not shown) separately prepared in the steel pipe chuck device 50 of the press fitting device 40. Mount it while fixing the chuck.

  Next, the rotary drive device 20 and the chuck device 22 are suspended by a crane (not shown) and inserted into the casing 4 from above.

Next, the rotary drive device 20 and the casing 4 are fixed to the upper portion of the casing 4 by the chuck device 22 so that the driving force of the rotary drive device 20 is transmitted.
Next, the casing 4 equipped with the rotation drive device 20 is inserted from above the steel pipe sheet pile 2.

Note that the insertion order of the casing 4 into the steel pipe sheet pile 2 and the mounting order of the rotary drive device 20 to the casing 4 are not limited.
Since the excavation body 3 is provided in the lower part of the casing 4, when the casing 4 is rotated by the rotation driving device 20, the excavation body 3 rotates to dig up (crush) the ground below the periphery of the casing 4.
That is, since the ground below the periphery of the casing 4 is dug and loosened by the excavating body 3 in advance, the casing 4 can be easily press-fitted as compared with a normal hydrostatic press-fitting operation.

  In addition, although the press-fitting work of the steel pipe sheet pile 2 is performed in parallel with the press-fitting of the casing 4, the press-fitting work of the casing 4 will be described first for easy understanding.

Since the excavated body 3 is positioned below the lower peripheral edge of the casing 4 so that the ground below the peripheral edge of the casing 4 can be loosened, the excavated body 3 is attached to the outer portion beyond the outer peripheral surface of the casing 4 so as to freely enter and exit. The excavation body 3 moves in and out (advances and retreats) from the lower part of the inner peripheral edge of the casing 4 to the outer part beyond the outer peripheral surface of the casing 4 according to the state of the ground, thereby loosening the ground.
That is, in the conventional medium digging press-fitting method, only the inner peripheral inner portion of the casing 4 is excavated, so that there is no ground in the inner peripheral inner portion of the casing 4, but there is ground in the lower periphery of the casing 4. However, the presence of the ground below the peripheral edge of the casing 4 may increase the press-fit resistance and the press-fit cannot be performed. However, even in such a work site, the ground below the peripheral edge of the lower end of the casing 4 is preliminarily used by the excavator 3 in this application. The press-in operation of the casing 4 (steel pipe sheet pile 2) is made possible by digging up.

  Moreover, since the earth and sand in the casing 4 are pressed in without discharging, the earth and sand remain in the steel pipe sheet pile 2 to be described later, and the steel pipe sheet pile 2 stands up in a state supported by earth and sand resistance from the inner periphery and outer periphery. In particular, the proof strength of the standing posture against the load from the horizontal direction can be improved.

  The excavation body 3 is rotatably attached to a mounting portion 28 provided on the lower inner periphery of the casing 4 by a shaft 29, and the rod 31 of the access cylinder 30 is attached to the excavation body 3, and the upper portion of the access cylinder 30 is a casing. Since the rod 31 of the entry / exit cylinder 30 is contracted, the excavation body 3 protrudes, and when the rod 31 of the entry / exit cylinder 30 is extended, the excavation body 3 retracts.

Next, the steel pipe sheet pile 2 is press-fitted by the press-fitting device 40 simultaneously with or after the press-fitting of the casing 4.
At this time, for example, when the ground is not so hard, the steel pipe sheet pile 2 is press-fitted by the press-fitting device 40 after digging and loosening the ground below the peripheral edge of the casing 4 with the excavating body 3.

  Further, when the ground is hard and the steel pipe sheet pile 2 cannot be press-fitted, the excavated body 3 is protruded and moved from the lower peripheral edge of the casing 4 to the lower peripheral edge of the steel pipe sheet pile 2 by the entrance / exit cylinder 30, and the rotary drive device 20 The excavated body 3 is driven and rotated to dig up and loosen the ground below the periphery of the steel pipe sheet pile 2 and then press-fit the steel pipe sheet pile 2.

Further, when the joint 1 is likely to be deformed and damaged when the steel pipe sheet pile 2 is press-fitted due to the hard ground, the excavator 3 is moved below the joint 1 and the ground is dug and loosened, and then press-fitted.
In this case, the position of the joint 1 is set in advance, and the excavated body 3 is projected and moved to the outside in the radial direction in front of the lower portion of the joint 1 without digging and loosening the ground around the entire circumference of the steel pipe sheet pile 2. Then, only the ground below the joint 1 is dug and loosened, temporarily retracted to the inner periphery of the steel pipe sheet pile 2, the casing 4 is rotated to the lower part of the next joint 1, and the radiation is emitted before the lower part of the joint 1 If the excavating body 3 is protruded and moved to the outside in the direction to loosen the digging, and this is repeated and the steel pipe sheet pile 2 is press-fitted, unnecessary digging and loosening work is not required, and the ground strength is not lowered.

Furthermore, the digging loosening method by the excavation body 3 is arbitrary, and is performed by changing the entry / exit position and the rotational speed of the excavation body 3 and the descending speed of the casing 4 according to the ground state.
Therefore, the excavator 3 is rotated not only once but also a plurality of times below the periphery of the steel pipe sheet pile 2 and / or the joint 1, or the excavator 3 is rotated forward and backward below the periphery of the steel pipe sheet pile 2 and / or the joint 1. You may let it loosen.

The steel pipe sheet pile 2 is pressed into the outer periphery of the steel pipe sheet pile 2 by reducing the chuck cylinder 54 of the press-fitting device 40 and lowering the chuck body 52, and in this state, the steel pipe press-fit cylinder 55 is extended to press-fit. The chuck body 52 of the press-fitting device 40 once releases the steel pipe sheet pile 2, chucks and presses the portion above the steel pipe sheet pile 2, and repeats this.
In this case, the vertical relationship between the lower end position of the steel pipe sheet pile 2 and the excavation body 3 is arbitrary, but when the excavation body 3 is positioned below the joint 1, the steel pipe sheet pile 2 is not press-fitted to the depth of the excavation body 3. The entrance / exit cylinder 30 and the steel pipe press-in cylinder 55 are controlled so as to avoid contact between the joint 1 and the excavated body 3 and to prevent breakage.

  When the steel pipe sheet pile 2 is press-fitted to a predetermined depth, the rotary drive device 20 is lifted together with the casing 4.

  Next, the chuck frame 51 is lifted by the steel pipe press-in cylinder 55, the entire press-fitting device 40 is once separated from the ground, and the joint 1 of the next steel pipe sheet pile 2 is aligned with the joint 1 of the existing steel pipe sheet pile 2. The press-fitting device 40 is moved by the ground traveling vehicle 10 or the work ship 65 to the upper side, the chuck frame 51 is lowered by the steel pipe press-fitting cylinder 55, and the entire press-fitting device 40 is installed on the upper surface of the ground. It is mounted on the press-fitting device 40, and the press-fitting work according to the work order is repeated.

8 and 9, the steel pipe in which the chuck device 22 of the rotation driving device 20 is inserted into the upper portion of the casing 4 by the rotation driving unit suspension wire 61 and chucked, and the casing 4 is attached to the press-fitting device 40. The steel pipe sheet pile 2 is press-fitted by inserting into the sheet pile 2 from above, rotating the casing 4 and the excavating body 3 as described above in the steel pipe sheet pile 2 to dig and loosen the ground.
Therefore, the rotation drive device 20 that is widely used can be arranged on the upper portion of the casing 4 so that the casing 4 can be driven and rotated. The rotation drive device 20 is selectively mounted without being limited by the inner diameter of the casing 4. This can reduce the device cost.

  In this way, since the ground below the peripheral edge of the steel pipe sheet pile 2 and / or the joint 1 is dug loosened by the excavating body 3, the press-fitting operation can be performed while reducing the press-fitting pressure when the press-fitting device 40 is press-fitted.

  DESCRIPTION OF SYMBOLS 1 ... Joint, 2 ... Steel pipe sheet pile, 3 ... Excavated body, 4 ... Casing, 10 ... Ground vehicle, 11 ... Crawler, 12 ... Table, 14 ... Stay, 15 ... Leader, 16 ... Vertical support part, 17 ... Hanging , 20 ... Rotation drive device, 21 ... Rotation output shaft, 22 ... Chuck device, 23 ... Chuck body, 24 ... Guide body, 25 ... Chuck cylinder, 28 ... Mounting portion, 29 ... Shaft, 30 ... Entrance / exit cylinder, DESCRIPTION OF SYMBOLS 31 ... Rod, 40 ... Press-fit apparatus, 41 ... Support frame, 42 ... Supporting leg, 43 ... Left and right frame, 44 ... Front and rear frame, 50 ... Steel pipe chuck device, 51 ... Chuck frame, 52 ... Chuck body, 54 ... For chuck Cylinder 55 ... Steel pipe press-fit cylinder, 56 ... Cylinder frame.

Claims (8)

  Inside the steel pipe sheet pile having a joint on the outer periphery, a casing provided with an excavating body located at the lower peripheral edge is inserted from above, and the chuck device that fixes the upper part of the casing is driven and rotated by a rotary driving device. A steel pipe sheet pile press-in method in which the ground is excavated and loosened with a casing excavated body while leaving the earth and sand, and the steel pipe sheet pile is press-fitted into the ground loosened with the excavated body. In claim 1,
The steel pipe sheet pile that moves the excavated body from the lower peripheral edge of the casing to the lower peripheral edge of the steel pipe sheet pile, loosens the ground with the excavated body below the peripheral edge of the steel pipe sheet pile, and presses the steel pipe sheet pile into the ground loosened by the excavated body. Press-in method. In claim 2,
The excavation body located below the peripheral edge of the steel pipe sheet pile is moved radially outward at the lower portion of the joint, and the excavation body loosens the ground below the joint and digs the ground below the joint. After loosening, while the lower part of the steel pipe sheet pile is moved down, the excavated body is retracted below the peripheral edge of the steel pipe sheet pile, and only the ground below the steel pipe sheet pile and the joint is dug loosened. Steel pipe sheet pile press-in method. An excavation body provided at a predetermined position on the lower periphery of the casing so as to freely enter and exit in the radial direction of the casing;
A chuck device for chucking the upper inner periphery of the casing;
A rotary drive device connected to the chuck device to drive and rotate the casing together with the excavation body;
A steel pipe sheet pile having a joint on the outer periphery, fitted to the outer periphery of the casing,
A steel pipe sheet pile press-in device comprising a steel pipe chuck device for chucking a lower portion of the steel pipe sheet pile and a press-fit device having a steel pipe press-in cylinder for press-fitting the steel pipe sheet pile. In claim 4,
The excavation body is rotatably attached to an attachment portion provided on a lower inner periphery of the casing by a shaft, and is advanced and retracted from an inner periphery of the casing to a lower portion of the joint by an access cylinder provided in the casing. Steel pipe sheet pile press-fitting device. In claim 4 or claim 5,
The rotary drive device is a steel pipe sheet pile press-fitting device that is configured with an outer diameter that can be inserted into the casing and that is integrated with the chuck device. In claim 4 or claim 5,
A steel pipe sheet pile press-fitting device configured to drive and rotate the casing together with a chuck device attached to the upper portion of the casing and chucked on the inner periphery of the upper portion of the casing by a rotation output shaft of the rotation driving device. In claim 4 or claim 5 or claim 6 or claim 7,
A steel pipe sheet pile press-fitting device in which the access cylinder and the rotary drive device are configured to move the excavation body forward and backward in the radial direction only at the lower portion of the joint to dig and loosen the ground.

Images