Cylindrical pile rotary press-in method and joint used for the same

Abstract

To provider a cylindrical pile rotary press-in method capable of executing efficient pile-driving work, and a joint used for the same.SOLUTION: In a cylindrical pile rotary press-in method which attaches a cylindrical pile 3 to a swivel head 7 of a cylindrical pile rotary press-in device 1, and elevates / lowers and rotates the cylindrical pile 3 by a swivel head elevating / lowering driving device and a rotary drive device so as to pile-drive the cylindrical pile 3 into a GL, an upper end of the cylindrical pile 3 pile-driven into the GL and a lower end of a connection cylindrical pile 3c disposed above the cylindrical pile 3 are rotatably connected by a joint 11, and the cylindrical pile 3 and the connection cylindrical pile 3c connected by the joint 11 are pile-driven into the GL.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a rotary driving method for cylindrical piles such as steel pipe piles using a pile driver, and a joint for the method. More specifically, the present invention relates to a rotary driving method for cylindrical piles, in which a cylindrical pile is attached to a spindle that is rotated by a rotary drive device of a swivel head, and the rotation of the spindle is transmitted to the cylindrical pile to drive the cylindrical pile, and a joint for the method. [Background technology]

[0002] Steel pipe pile rotary driving equipment is used in a construction method in which a cylindrical steel pipe pile is rotated and driven into the ground by the driving force of the steel pipe pile. The final step in the construction of a steel pipe pile is the embedding work, in which the steel pipe pile is embedded to the specified design height. For this embedding work, vertically long components called pliers are connected to the top of the steel pipe pile (Patent Document 1, Patent Document 2). It is necessary to prepare multiple types of pliers with lengths according to the embedding height. In construction using pliers, the pliers are fixed to the spindle of a rotating swivel head with a hydraulic chuck.

[0003] Also known is a system in which a steel pipe pile is fixed by a hydraulic chuck with a swivel head equipped with a hollow spindle, and then rotated and pressed into the pile to drive it. The applicant has also proposed a ground drilling device that accelerates drilling into the ground by generating vibrations using a vibration exciter that rotates an eccentric weight (see, for example, Patent Document 3, which discloses vibration exciters 6, 25, and 31). Furthermore, a boring machine has been proposed in which a hydraulic piston, rather than a disc spring, is used to drive a chuck piece that fixes the boring rod from the outer periphery in order to fix the boring rod to the spindle (Patent Document 4). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-197967 [Patent Document 2] Japanese Patent Application Publication No. 2019-218787 [Patent Document 3] Japanese Patent Application Laid-Open No. 2005-337003 [Patent Document 4] Japanese Patent Application Publication No. 8-135360 Summary of the Invention [Problem to be solved by the invention]

[0005] When driving steel pipe piles or other piles, if the pile exceeds ground level (GL), it is necessary to drive the pile so that the pile head is below ground level. To achieve this, the swivel head chuck holding the pile is released, special pliers are attached to the chuck, and the pile is rotated and pressed into place using the pliers to drive the pile to a height lower than the designated ground level. After driving the pile at one driving point, the pliers must be removed. At another driving point, the pile must be chucked with the pliers removed, and the pile must be driven by simultaneously rotating and pressing the pile. This means that the pliers must be attached and detached from the swivel head chuck each time a pile is driven at a driving point. This requires a special attachment to connect the pliers to the pile. Furthermore, with the conventional cylindrical pile rotary press-in method, multiple types of pliers of different lengths must be prepared depending on the height of the pile to be driven.

[0006] The present invention has been made in view of the above background to achieve the following objects. An object of the present invention is to provide a cylindrical pile rotary press-in method and a joint therefor that enable pile driving work to be carried out efficiently. Another object of the present invention is to provide a cylindrical pile rotary driving method and a joint thereof that allow pile driving work to be performed without the need to attach or detach pliers. [Means for solving the problem]

[0007] In order to solve the above-described problems, the present invention employs the following means. The cylindrical pile rotary press-in method of the present invention is as follows: A cylindrical pile rotary driving method in which a cylindrical pile is attached to a swivel head of a cylindrical pile rotary driving device, and the cylindrical pile is raised and lowered and rotated by a swivel head lifting drive device and a rotation drive device, and the cylindrical pile is driven into the ground. The upper end of the cylindrical pile driven into the ground and the lower end of the connected cylindrical pile arranged above the cylindrical pile are connected by a joint in a manner that allows rotation to be transmitted, The cylindrical pile and the connected cylindrical pile connected by the joint are driven into the ground. It is characterized by:

[0008] The cylindrical pile rotary press-in method of the present invention is the same as the method 1, The cylindrical pile rotary driving device is a columnar leader; a swivel head attached to the reader so as to be able to move up and down; a spindle rotatably supported on the swivel head; a through hole formed at the axis of the spindle; A chuck for fixing the cylindrical pile inserted into the through hole; Equipped with It is characterized by:

[0009] The cylindrical pile rotary press-in method of the present invention is the above-mentioned means 1 or 2, The cylindrical pile rotary driving device is A vibration excitation device is provided for driving the cylindrical piles connected by the joints and the connected cylindrical piles into the ground. It is characterized by:

[0010] The cylindrical pile rotary press-in method of the present invention is the same as the method 2, The chuck grips the cylindrical pile and the connecting cylinder by hydraulic pressure. It is characterized by:

[0011] The cylindrical pile rotary press-in method of the fifth aspect of the present invention is the above-mentioned means 1 or 2, The joint is A first engagement groove is provided near the lower end of the joint and engages with a first pin provided near the upper end of the cylindrical pile; A second engagement groove is provided near the upper end of the joint and engages with a second pin provided near the lower end of the connected cylindrical pile; Equipped with The second engagement groove is L-shaped so as not to come off from the connecting cylindrical pile against the upward biasing force from the connecting cylindrical pile. It is characterized by:

[0012] The cylindrical pile rotary press-in method of the sixth aspect of the present invention is the method of the first or second aspect, A cylindrical pile rotary press-in method in which a pipe guide that holds an installed cylindrical pile to be installed on the swivel head of the cylindrical pile or the connected cylindrical pile is provided near the top of the cylindrical pile rotary press-in device, The pipe guide includes a fixing portion fixed near the top of the cylindrical pile rotary driving device and a gripping claw that grips the middle of the installed cylindrical pile, and the installed cylindrical pile gripped by the gripping claw can be inserted into the swivel head and installed. It is characterized by:

[0013] The joint of the seventh aspect of the present invention is used in the cylindrical pile rotary press-in method described in the first or second aspect, A joint that connects the upper end of the cylindrical pile driven into the ground and the lower end of a connecting cylindrical pile arranged above the cylindrical pile in a rotationally transmittable manner, A first engagement groove is provided near the lower end of the joint and engages with a first pin provided near the upper end of the cylindrical pile; A second engagement groove is provided near the upper end of the joint and engages with a second pin provided near the lower end of the connected cylindrical pile; Equipped with The first engagement groove is straight in the vertical direction, The second engagement groove is L-shaped so as not to come off from the connecting cylindrical pile against the upward biasing force from the connecting cylindrical pile. It is characterized by: [Effects of the Invention]

[0014] According to the cylindrical pile rotary driving method of the present invention, when the driving of a cylindrical pile at one driving point is completed and the cylindrical pile rotary driving device is moved to the next driving point, a connected cylindrical pile with the same configuration as the cylindrical pile is fixed to the cylindrical pile rotary driving device, so that the pile driving work can be started using the connected cylindrical pile. Therefore, the cylindrical pile rotary driving method of the present invention allows for efficient pile driving work. Furthermore, according to the cylindrical pile rotary driving method of the present invention, there is no need for pliers long enough to connect to the cylindrical pile and drive the cylindrical pile into the ground, and construction can be done using a single type of joint. Therefore, there is no need to prepare multiple types of pliers, which reduces equipment costs and improves the efficiency of pile driving work.

[0015] In the joint of the present invention, the first engagement groove is straight in the vertical direction, while the second engagement groove is L-shaped so that it does not disengage from the connecting cylindrical pile against the upward biasing force from the connecting cylindrical pile. Therefore, when the first engagement groove is engaged with the first pin of the cylindrical pile to connect the cylindrical pile downward, and the second engagement groove is engaged with the second pin of the connecting cylindrical pile to connect the connecting cylindrical pile upward, and the swivel head holding the connecting cylindrical pile is raised, the joint disengages from the cylindrical pile while rising together with the connecting cylindrical pile to a higher level in the ground. As a result, when the cylindrical pile is driven into the ground and the pile driving operation is completed at one pile driving site, the swivel head holds the connecting cylindrical pile to be driven at the next pile driving site, allowing for efficient pile driving. In other words, the joint of the present invention can achieve the above-mentioned effects of the cylindrical pile rotary press-in method of the present invention. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a side view showing a cylindrical pile rotary driving-in device used in the cylindrical pile rotary driving-in method of the present invention. [Figure 2] FIG. 2 shows a perspective view and a cross-sectional view of a joint used in the cylindrical pile rotary driving method of the present invention. [Figure 3]Figure 3 is a side view for explaining pile driving work using the cylindrical pile rotary driving method of the present invention, where (a) shows the cylindrical pile rotary driving device at the start of pile driving work, (b) shows the state in which the cylindrical pile is being set in the cylindrical pile rotary driving device, (c) shows the state in which the swivel head is raised, and (d) shows the state in which the cylindrical pile is being driven. [Figure 4] Figure 4 is a side view to explain the pile driving operation using the cylindrical pile rotary driving method of the present invention, where Figure (a) shows the cylindrical pile rotary driving device with a joint and a connecting cylindrical pile connected to the cylindrical pile, Figure (b) shows the state in which the swivel head has been raised, Figure (c) shows the state in which the cylindrical pile has been embedded below the ground, and Figure (d) shows the state in which the connecting cylindrical pile and joint have been detached from the cylindrical pile and the connecting cylindrical pile has been pulled up. [Figure 5] Figure 5 is a side view used to explain the conventional cylindrical pile rotary driving method as a comparative example, where (a) shows the cylindrical pile rotary driving device with the pliers connected to the cylindrical pile set in place, (b) shows the state in which the swivel head is raised, (c) shows the state in which the cylindrical pile is embedded deep into the ground, and (d) shows the state in which the pliers have been detached from the cylindrical pile and pulled up. [Figure 6] Figure 6 is a diagram for explaining the pipe guide used in the cylindrical pile rotary driving method of the present invention, where Figure 6(a) is a plan view of the cylindrical pile aligned with the guide claws open, Figure 6(b) is a side view of the cylindrical pile set in the pipe guide, Figure 6(c) is a plan view of the guide claws closed, and Figure 6(d) is a side view showing the cylindrical pile set in the pipe guide being rotated to insert it into the swivel head. DETAILED DESCRIPTION OF THE INVENTION

[0017] (Cylindrical pile rotary press-in device 1) The cylindrical pile rotary driving-in device of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a cylindrical pile rotary driving-in device used in the cylindrical pile rotary driving-in method of the present invention. As shown in FIG. 1, the cylindrical pile rotary driving-in device 1 is a device for driving a cylindrical pile 3 or a connected cylindrical pile 3c into ground level. The cylindrical pile rotary driving-in device 1 includes a columnar leader 5, a swivel head 7 attached to the leader 5 so as to be movable up and down, and a swivel head lifting drive device (not shown) for driving the swivel head 7 up and down. The cylindrical pile rotary driving-in device 1 also includes a spindle 9 rotatably supported by the swivel head 7 and to which the cylindrical pile 3 or the connected cylindrical pile 3c is fixed, and a rotation drive device (not shown) for rotating the spindle 9. As shown in FIG. 1, the cylindrical pile rotary driving-in device 1 also includes a joint 11 that is rotationally engageable with the upper end of the cylindrical pile 3 driven into the ground level and the lower end of the connected cylindrical pile 3c arranged above the cylindrical pile 3.

[0018] (Leader 5, Swivel head 7, Spindle 9) As shown in FIG. 1, the leader 5 is attached to a vehicle body 13 so as to be able to stand up or tilt. The vehicle body 13 is capable of traveling by a crawler device (caterpillar device) 15. The swivel head 7 rises and falls together with the cylindrical pile 3 or the connected cylindrical pile 3c fixed to the spindle 9. The spindle 9 is provided within the swivel head 7, and a through-hole 17 is formed at the axis thereof. The cylindrical pile 3 or the connected cylindrical pile 3c is inserted into the through-hole 17, and the cylindrical pile 3 or the connected cylindrical pile 3c is fixed to the through-hole 17 by a chuck (not shown). That is, the cylindrical pile 3 or the connected cylindrical pile 3c rises and falls together with the spindle 9 and swivel head 7 by a swivel head lifting / lowering drive device. The cylindrical pile 3 and the connected cylindrical pile 3c rotate together with the spindle 9 by a rotation drive device. The swivel head lifting / lowering drive device is composed of a feed motor or the like, and the rotation drive device is composed of a hydraulic motor, an electric motor or the like.

[0019] (Joint 11) FIG. 2 shows a perspective view and a cross-sectional view of a joint used in the cylindrical pile rotary press-in construction method of the present invention. As shown in FIG. 2, the tubular joint 11 is a device that connects the cylindrical pile 3 and the connecting cylindrical pile 3c placed on top of the cylindrical pile 3. The joint 11 is provided near the lower end of the joint 11 with a pair of first engagement grooves 21-1 formed in its axial direction and engaged with a first pin 19-1 provided near the upper end of the cylindrical pile 3. The joint 11 also has a pair of second engagement grooves 21-2 formed in its axial direction and engaged with a second pin 19-2 provided near the lower end of the connecting cylindrical pile 3c. A stopper 23 is provided in the middle of the joint 11 to position the upper end of the cylindrical pile 3 and the lower end of the connecting cylindrical pile 3c.

[0020] The first pin 19-1 penetrates the cylindrical pile 3 in the diametrical direction in a plan view of the cylindrical pile 3. Two first engagement grooves 21-1 are provided at symmetrical positions in a plan view of the cylindrical pile 3, and each engages with the first pin 19-1 penetrating the cylindrical pile 3. The second pin 19-2 penetrates the connecting cylindrical pile 3c in the diametrical direction in a plan view of the cross section of the connecting cylindrical pile 3c. Two second engagement grooves 21-2 are provided at symmetrical positions in a plan view of the cross section of the connecting cylindrical pile 3c, and each engages with the second pin 19-2 penetrating the connecting cylindrical pile 3c. The first engagement groove 21-1 is straight in the vertical direction and disengages from the first pin 19-1 due to the upward biasing force from the joint 11. The second engagement groove 21-2 has a locking portion 27 formed in the circumferential direction to prevent the second pin 19-2 from slipping out upward against the upward biasing force from the connecting cylindrical pile 3c. That is, the second engagement groove 21-2 is L-shaped so as not to come off from the connected cylindrical pile 3c against the upward biasing force from the connected cylindrical pile 3c.

[0021] (Cylindrical pile rotary press-in method of the present invention) Next, the cylindrical pile rotary driving method of the present invention, which is performed using the aforementioned cylindrical pile rotary driving device 1, will be described with reference to Figures 3 and 4. First, as shown in Figure 3(a), the cylindrical pile rotary driving device 1 is positioned at a pile driving point where the cylindrical pile 3 is to be driven. The lower part of the swivel head 7 is the pile driving position in the ground clearance. Next, as shown in Figure 3(b), the cylindrical pile 3 is passed through the through hole 17 of the spindle 9 in the swivel head 7 and set in the cylindrical pile rotary driving device 1. At this time, the lower end of the cylindrical pile passed through the through hole 17 is in contact with the ground clearance, and the chuck in the spindle 9 is in an open state.

[0022] As shown in FIG. 3(b), when setting the cylindrical pile 3 (installed cylindrical pile) in the cylindrical pile rotary driving device 1, a pipe guide 35 shown in FIG. 6 is preferably used. The pipe guide 35 is configured so that a pair of guide claws 37 can be opened and closed by a cylinder 39, and is installed at the top of the leader 5 of the cylindrical pile rotary driving device 1. As shown in FIGS. 6(a) and 6(b), the pipe guide 35 installed at the top is set in the guide claws 37 with the guide claws 37 in an open position, with the tip of the cylindrical pile 3 set within the guide claws 37. Next, as shown in FIGS. 6(c) and 6(d), the guide claws 37 are closed to prevent the cylindrical pile 3 from coming off the guide claws 37, and the guide claws 37 grip the upper portion of the tilting cylindrical pile 3. Therefore, the pipe guide 35 can temporarily hold the cylindrical pile 3 in order to set it in the cylindrical pile rotary driving device 1. The operation of holding the cylindrical pile 3 using such a pipe guide 35 can be performed from the front or the left and right sides of the cylindrical pile rotary driving device 1. On the other hand, if the pipe guide 35 is not used, the worker must hold and lift the cylindrical pile 3 by hand in order to set the cylindrical pile 3 into the cylindrical pile rotary driving device 1. By using the pipe guide 35, the cylindrical pile 3 will not move, such as swinging, and the safety of the cylindrical pile 3 setting work can be improved.

[0023] When the cylindrical pile 3 is set in the cylindrical pile rotary driving device 1, the swivel head 7 is raised as shown in Figure 3(c). At this time, the chuck that fixes the cylindrical pile 3 to the spindle 9 is in an open state, and the swivel head 7 passes over the surface of the cylindrical pile 3. Next, the chuck is closed to fix the cylindrical pile 3 to the spindle 9, and the spindle 9 and swivel head 7 are lowered as shown in Figure 3(d). The operations of Figure 3(c) and Figure 3(d) are repeated, and the cylindrical pile 3 fixed to the spindle 9 is driven into the GL.

[0024] Next, the aforementioned joint 11 is attached to the cylindrical pile 3, and the connecting cylindrical pile 3c is attached to the joint 11, as described below, thereby connecting the cylindrical pile 3 and the connecting cylindrical pile 3c in a manner that allows rotation to be transmitted. First, as shown in Figure 4(a), the cylindrical pile 3 is pressed into the ground rail more than halfway, and the area near the upper end of the cylindrical pile 3 protrudes above the ground rail. Then, the joint 11 shown in Figure 2 is attached to the upper end of the cylindrical pile 3. At this time, the first pin 19-1 provided on the cylindrical pile 3 is engaged with the first engagement groove 21-1 of the joint 11. The first engagement groove 21-1 is parallel to the vertical direction (the axis of the cylindrical pile 3), and when an upward biasing force acts on the joint 11, the joint 11 is disengaged upward from the first pin 19-1. Next, the connecting cylindrical pile 3c, which has the same configuration as the cylindrical pile 3, is attached to the upper end of the joint 11. At this time, the second pin 19-2 provided on the connecting cylindrical pile 3c engages with the second engagement groove 21-2 of the joint 11. The connecting cylindrical pile 3c attached to the joint 11 is rotated counterclockwise in a plan view, and the second pin 19-2 is engaged with the engagement portion 27. Because the second engagement groove 21-2 is L-shaped and has the engagement portion 27, even if an upward biasing force (pulling-up direction) acts on the connecting cylindrical pile 3c, the connecting cylindrical pile 3c will not come off the second pin 19-2 upward.

[0025] As described above, when the cylindrical pile 3 and the connecting cylindrical pile 3c are connected by the joint 11 so that rotation can be transmitted, the swivel head 7 is raised as shown in FIG. 4(b). At this time, the chuck is open, and the swivel head 7 passes over the surface of the cylindrical pile 3, the surface of the joint 11, and the surface of the connecting cylindrical pile 3c. Next, the chuck is closed, the connecting cylindrical pile 3 is fixed to the spindle 9, and the spindle 9 and swivel head 7 are lowered as shown in FIG. 4(c). This causes the cylindrical pile 3 and the joint 11 to be pressed into the ground. When the cylindrical pile 3 is pressed into the ground until the depth d from the top end of the cylindrical pile 3 to the ground is, for example, 20 cm, and the cylindrical pile 3 is completely embedded, the lowering of the swivel head 7 is stopped, and the pressing-in of the cylindrical pile 3 is stopped.

[0026] Next, as shown in Figure 4(d), the swivel head 7 rises, and the connecting cylindrical pile 3c fixed to the spindle 9 rises. At this time, an upward biasing force acts on the connecting cylindrical pile 3c and the joint 11, so the first engagement groove 21-1, which is straight in the vertical direction, disengages upward from the first pin 19-1 of the joint 11. This allows the joint 11 to easily disengage upward from the cylindrical pile 3. On the other hand, because the second engagement groove 21-2 is L-shaped and the second pin 19-2 is engaged with the engaging portion 27, even if an upward biasing force acts on the connecting cylindrical pile 3c, the connecting cylindrical pile 3c does not disengage upward from the second pin 19-2. As a result, the joint 11 does not disengage from the connecting cylindrical pile 3c and rises together with the connecting cylindrical pile 3c.

[0027] When the joint 11 rises above GL, the joint 11 is rotated counterclockwise in a plan view, and the joint 11 is detached from the connected cylindrical pile 3c. With the joint 11 detached from the connected cylindrical pile 3c, the cylindrical pile rotary driving device 1 is moved to the next pile driving point. At this time, because the connected cylindrical pile 3c is fixed to the spindle 9, pile driving work can be started at the next pile driving point using the connected cylindrical pile 3c. Therefore, at the next pile driving point, there is no need to attach the cylindrical pile to be driven to the cylindrical pile rotary driving device 1, and pile driving work can be carried out efficiently.

[0028] (Conventional cylindrical pile rotary press-in method as a comparison example) As a comparative example, a conventional cylindrical pile rotary press-in method will be described. In this comparative example, the operations from setting the cylindrical pile 3 in the cylindrical pile rotary press-in device 1 to pressing the cylindrical pile 3 into the ground rail are the same as those shown in Figure 3.

[0029] In the cylindrical pile rotary driving method of the comparative example, the cylindrical pile 3 is driven more than halfway into the ground glass, and as shown in Figure 5(a), when the vicinity of the upper end of the cylindrical pile 3 is protruding above the ground glass, pliers 33 are connected to the upper end of the cylindrical pile 3. The pliers 33 are tools that are connected to the top of the cylindrical pile 3 in order to drive the cylindrical pile 3 into the ground, and have a length that allows the cylindrical pile 3 to be driven into the ground. The pliers 33 are tools specifically for driving the cylindrical pile 3 into the ground, and are connected to the cylindrical pile 3 by an attachment (not shown) at the lower end, etc.

[0030] When the pliers 33 are connected to the cylindrical pile 3, the swivel head 7 is raised as shown in Figure 5(b). At this time, the chuck is in an open state, and the swivel head 7 passes over the surface of the cylindrical pile 3 and the surface of the pliers 33. Next, the chuck is closed, the pliers 33 are fixed to the spindle 9, and the spindle 9 and swivel head 7 are lowered as shown in Figure 5(c). This causes the cylindrical pile 3 and the pliers 33 to be pressed into the ground. When the cylindrical pile 3 is pressed into the ground until the depth d from the top end of the cylindrical pile 3 to the ground is, for example, 20 cm, and the cylindrical pile 3 is completely embedded, the lowering of the swivel head 7 is stopped, and the pressing-in of the cylindrical pile 3 is stopped.

[0031] Next, as shown in FIG. 5(d), the swivel head 7 rises, and the pliers 33 fixed to the spindle 9 detach from the cylindrical pile 3 and rise above the ground level. At this time, to detach the pliers 33 from the cylindrical pile 3, it is necessary to operate an attachment (not shown) at the lower end of the pliers 33. This detachment operation is cumbersome and difficult, for example, because the attachment is embedded in the ground. When the pliers 33 rise above the ground level, the chuck is opened and the pliers 33 are detached from the spindle 9. With the pliers 33 detached, the cylindrical pile rotary driving device 1 is moved to the next pile driving site. At the next pile driving site, the next cylindrical pile must be set on the spindle 9 and the pile driving operation must begin. Therefore, at the next pile driving site, the cylindrical pile to be driven must be attached to the cylindrical pile rotary driving device 1, which makes it difficult to carry out the pile driving operation efficiently.

[0032] (Effects of the cylindrical pile rotary press-in method of the present invention) According to the cylindrical pile rotary drive-in method of the present invention, when pile driving at one pile driving point is completed and the cylindrical pile rotary drive-in device 1 is moved to the next pile driving point, a connected cylindrical pile 3c having the same configuration as the cylindrical pile 3 is fixed to the spindle 9, so pile driving work can be started using the connected cylindrical pile 3c. In contrast, with the cylindrical pile rotary drive-in method of the comparative example, it is necessary to set the next cylindrical pile 3 on the spindle 9 at the next pile driving point and start pile driving work. Therefore, the cylindrical pile rotary drive-in method of the present invention can carry out pile driving work more efficiently than the cylindrical pile rotary drive-in method of the comparative example. Furthermore, while the cylindrical pile rotary drive-in method of the comparative example requires pliers 33 long enough to connect to the cylindrical pile 3 and drive the cylindrical pile 3 into the ground, the cylindrical pile rotary drive-in method of the present invention does not require pliers and can be carried out using a single type of joint. Therefore, there is no need to prepare multiple types of pliers, and the cylindrical pile rotary driving method of the present invention can reduce equipment costs and improve the efficiency of pile driving work compared to the cylindrical pile rotary driving method of the comparative example.

[0033] Although the cylindrical pile rotary press-in construction method of the present invention has been described above using the drawings, the cylindrical pile rotary press-in construction method of the present invention is not limited to the above. For example, the shape of the swivel head is not particularly limited as long as it can raise and lower the cylindrical pile or connected cylindrical pile. Furthermore, the shape of the spindle is not particularly limited as long as it can fix the cylindrical pile or connected cylindrical pile with a chuck or the like and rotate relative to the swivel head. [Explanation of symbols]

[0034] 1: cylindrical pile rotary pressing device, 3: cylindrical pile, 3c: connected cylindrical pile, 5: leader, 7: swivel head, 9: spindle, 11: joint, 13: body, 15: crawler device, 17: through hole, 19-1: first pin, 19-2: second pin, 21-1: first engagement groove, 21-2: second engagement groove, 23: stopper, 27: engaging portion, 35: pipe guide, 37: guide claw, 39: cylinder 33: Yattoko GL: Planned height of ground surface

Claims

1. A cylindrical pile rotary driving method in which a cylindrical pile is attached to a swivel head of a cylindrical pile rotary driving device, and the cylindrical pile is raised and lowered and rotated by a swivel head lifting drive device and a rotation drive device, and the cylindrical pile is driven into the ground. The upper end of the cylindrical pile driven into the ground and the lower end of the connected cylindrical pile arranged above the cylindrical pile are connected by a joint in a manner that allows rotation to be transmitted, The cylindrical pile and the connected cylindrical pile connected by the joint are driven into the ground. Cylindrical pile rotary press-in method.

2. The cylindrical pile rotary driving device is a columnar leader; a swivel head attached to the reader so as to be able to move up and down; a spindle rotatably supported on the swivel head; a through hole formed at the axis of the spindle; A chuck for fixing the cylindrical pile inserted into the through hole; Equipped with A cylindrical pile rotary press-in method according to claim 1.

3. The cylindrical pile rotary driving device is A vibration excitation device is provided for driving the cylindrical piles connected by the joints and the connected cylindrical piles into the ground. A cylindrical pile rotary press-in method according to claim 1 or 2.

4. 3. The cylindrical pile rotary press-in construction method according to claim 2, wherein the chuck grips the cylindrical pile and the connecting cylinder by hydraulic pressure.

5. The joint is A first engagement groove is provided near the lower end of the joint and engages with a first pin provided near the upper end of the cylindrical pile; A second engagement groove is provided near the upper end of the joint and engages with a second pin provided near the lower end of the connecting cylindrical pile; Equipped with The second engagement groove is L-shaped so as not to come off from the connecting cylindrical pile against the upward biasing force from the connecting cylindrical pile. A cylindrical pile rotary press-in method according to claim 1 or 2.

6. A cylindrical pile rotary press-in method in which a pipe guide that holds an installed cylindrical pile to be installed on the swivel head of the cylindrical pile or the connected cylindrical pile is provided near the top of the cylindrical pile rotary press-in device, The pipe guide includes a fixing portion fixed near the top of the cylindrical pile rotary driving device and a gripping claw that grips the middle of the installed cylindrical pile, and the installed cylindrical pile gripped by the gripping claw can be inserted into the swivel head and installed. A method for rotary pressing a cylindrical pile according to claim 1 or 2.

7. A joint used in the cylindrical pile rotary driving method described in claim 1 or 2, which connects the upper end of the cylindrical pile driven into the ground and the lower end of a connecting cylindrical pile arranged above the cylindrical pile in a rotationally transmittable manner, A first engagement groove is provided near the lower end of the joint and engages with a first pin provided near the upper end of the cylindrical pile; A second engagement groove is provided near the upper end of the joint and engages with a second pin provided near the lower end of the connecting cylindrical pile; Equipped with The first engagement groove is straight in the vertical direction, The second engagement groove is L-shaped so as not to come off from the connecting cylindrical pile against the upward biasing force from the connecting cylindrical pile. A joint characterized by:

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