Holding chuck attachment and pile driving construction method

Abstract

To enable press-in of a longer press-in pile when press-in piles are connected by a vertical joint and pressed-in.SOLUTION: A pile press-in device 10 comprises: a saddle 1; clamp devices 2F, 2R provided at a bottom of the saddle 1 and gripping upper ends of existing piles pressed into the ground; a mast 4 erected on the saddle 1; a lifting device 5; and a chuck device 6 supported by the mast 4 via the lifting device 5 and gripping pressed-in piles Pd. Using the pile press-in device 10, when connecting a plurality of pressed-in piles Pd by a vertical joint and pressing a connected pile connected in a longitudinal direction into the ground, a holding chuck attachment 60 holds upper parts of the pressed-in piles Pd. The holding chuck attachment 60 includes: a fixing clamp device 64 clamping the upper ends of the existing piles P and fixing the holding chuck attachment 60 to the existing piles P; and holding chuck devices 61, 62 gripping the upper parts of the pressed-in piles Pd.SELECTED DRAWING: Figure 7

Description

Technical Field

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[0001] The present invention relates to a holding chuck attachment and a pile driving construction method.

Background Art

[0002] Conventional pile driving devices grasp the upper end of an existing pile driven into the ground to obtain a reaction force, hold the pile and drive it into the ground, and continuously drive the pile while moving on the pile row formed by the existing piles to extend the pile row on the ground.

[0003] By the way, there are cases where pile driving of a connected pile formed by connecting a plurality of piles is performed. The pile driving operation of this connected pile is performed by repeating the pile driving of the pile before connection and the addition (connection) of a new pile while connecting them.

[0004] Conventional pile driving devices provide a sub-chuck capable of grasping the preceding pile below a chuck device for the pile driving operation of a connected pile, grasp the upper end of the preceding pile with the sub-chuck, and connect them to each other (addition operation) while holding the next pile with the chuck device, and perform pile driving of the integrated pile (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0005] <000002"3>

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in the above pile driving device, since the sub-chuck is arranged below the chuck device, there is a problem that only piles with a shorter length can be used in order to avoid interference with the sub-chuck.

[0007] This invention has been made in view of the problems of the prior art described above, and aims to enable the driving of longer piles when connecting piles together and driving them into the ground. [Means for solving the problem]

[0008] One aspect of the present invention for solving the above problems is: When using a pile driving device that grips the upper end of an existing pile to take reaction force, and connecting two driving piles by longitudinal joints to drive them into the ground, Leading by vertically A retaining chuck attachment for holding the upper part of the press-in pile, A fixing clamping device that clamps the upper end of an existing pile and fixes the holding chuck attachment to the existing pile, The aforementioned The preceding A retaining chuck device that grips the upper part of the press-in pile Yes, When the pile driving device connects a new pile to be added longitudinally using a chuck device mounted on the pile driving device, the upper part of the preceding pile is held by the holding chuck device. This is a retaining chuck attachment.

[0009] Another aspect of the present invention is, A pile driving construction method in which, using the above-mentioned retaining chuck attachment, driving driving piles into the ground by connecting them longitudinally, This pile driving construction method includes a pile connection step in which the upper end of the existing pile is clamped, and the holding chuck attachment fixed to the existing pile grips the upper part of one of the driving piles, thereby connecting the other driving pile. [Effects of the Invention]

[0010] According to the present invention, when press-in piles are connected and pressed in, it is possible to press in longer press-in piles. [Brief explanation of the drawing]

[0011] [Figure 1] This is a perspective view showing the implementation status of a pile driving construction method using a pile driving device according to one embodiment of the present invention. [Figure 2] This is a perspective view showing the scene as it progresses from Figure 1. [Figure 3] It is a perspective view showing a scene advanced from FIG. 2. [Figure 4] It is a perspective view showing a scene advanced from FIG. 3. [Figure 5A] It is a plan view showing the implementation status of the pile pressing construction method at a site with altitude restrictions. [Figure 5B] It is a side view of FIG. 5A. [Figure 6A] It is a plan view showing a scene advanced from FIG. 5A. [Figure 6B] It is a side view of FIG. 6A. [Figure 7] It is a plan view of the holding chuck attachment showing the arrangement during pile pressing construction. [Figure 8] It is a plan view of the holding chuck attachment. <00OO083>It is a side view of the holding chuck attachment. [Figure 10] It is a process diagram of the pile pressing construction method for a split pile using the holding chuck attachment. [Figure 11] It is a process diagram of the pile pressing construction method for a split pile following FIG. 10. [Figure 12] It is a process diagram of the pile pressing construction method for a split pile following FIG. 11. [Figure 13] It is a process diagram of the pile pressing construction method for a split pile following FIG. 12. [Figure 14] It is a process diagram of the pile pressing construction method for a split pile following FIG. 13. [Figure 15] It is a process diagram of the pile pressing construction method for a split pile following FIG. 14. [Figure 16] It is a process diagram of the pile pressing construction method for a split pile following FIG. 15. <OO00099>[[ID=A9]]It is a process diagram of the pile pressing construction method for a split pile following FIG. I6. [Figure 18] It is a process diagram of the pile pressing construction method for a split pile following FIG. 17.

Mode for Carrying Out the Invention

[0012] One embodiment of the present invention will be described below with reference to the drawings. The following is one embodiment of the present invention and is not limited to the present invention. This embodiment illustrates a holding chuck attachment for holding the upper part of the leading press-in pile when press-in piles are pressed into the ground by longitudinally connecting press-in piles, a pile press-in device for press-in the press-in of the press-in pile, and a pile press-in construction method using these. In the following explanation, each of the multiple piles constituting a connected pile will be referred to as a segmented pile. Furthermore, in the following explanation, "existing piles" refers to piles that have already been driven in and will not be driven in any further, regardless of the type of pile. Also, "driven piles" refers to piles that are about to be driven in or are in the process of being driven in, regardless of the type of pile. In the case of segmented piles that form connected piles by longitudinal splicing, segmented piles that are gripped by the chuck device 6 of the pile driving device 10, and segmented piles that are driven into the ground and are scheduled to be further connected by longitudinal splicing and driven in, are all considered "driven piles." A longitudinal joint refers to connecting the ends of multiple piles that are arranged in a series with their longitudinal directions aligned.

[0013] [Pile press-in device] First, the pile driving device 10 will be explained based on Figures 1 to 6B. Figures 1 to 4 show various operations of the pile driving device 10 during pile driving in four different scenarios. Figures 5A, 5B, 6A, and 6B show two scenarios of implementation at a site with overhead restrictions. For directional indication. left and right The direction axis is the X axis, Front and back The diagram shows the three orthogonal axes X, Y, and Z, with the Y-axis representing the direction and the Z-axis representing the vertical direction.

[0014] The pile driving device 10 comprises a saddle 1, a plurality of clamping devices 2F, 2R provided below the saddle 1 to grip the upper ends of existing piles P1-P4... that have been driven into the ground, a slide base 3 provided to move horizontally on the saddle 1, a mast 4 erected on the slide base 3 so as to be rotatable around the mast pivot axis MZ, a lifting device 5, and a chuck device 6 supported by the mast 4 via the lifting device 5 to grip the piles P. Existing piles P1-P4... are simply referred to as existing piles P when there is no need to distinguish them individually. These existing piles P may be connected piles formed by longitudinally joining multiple segmented piles (driven piles).

[0015] The chuck device 6 is installed on the chuck frame 7 and is rotatable around the gripping central axis CZ. By rotating the chuck device 6 while gripping the pile, a rotary press-in method can be implemented in which the pile is pressed in while rotating. Furthermore, the pile driving device 10 is equipped with a chuck tilting mechanism 9, which allows the lifting device 5 to be tilted together with the chuck device 6 and chuck frame 7 around the chuck tilting axis CY in a direction that intersects with the mast 4 and aligns the mast 4 and the chuck device 6. The chuck device 6 and chuck frame 7 are supported on the mast 4 via a lifting device 5. The lifting device 5 can raise and lower the chuck device 6 and chuck frame 7 along the gripping center axis CZ. The structure, consisting of a chuck device 6 and a chuck frame 7, has a through-hole 8 into which the pile is inserted. Multiple clamping devices 2F, 2R consist of a front clamping device 2F and a rear clamping device 2R. Note that three or more clamping devices may be provided. The slide base 3 slides in the front-to-back direction. The rear clamping device 2R can also slide in the front-to-back direction, and the distance between it and the front clamping device 2F is variable. This function allows it to be adjusted to the distance between piles.

[0016] The pile driving method will be explained starting from the point where the upper end of the existing pile P, which has been driven into the ground, is grasped by clamping devices 2F and 2R. Currently, as shown in the diagram, the upper ends of the existing piles P2 and P3 are being gripped by clamp devices 2F and 2R. In Figure 1, pile P1 has already been driven in, but to explain from the situation where pile P1 is being driven in while being gripped by the chuck device 6, the upper ends of the existing piles P2 and P3 are gripped by clamp devices 2F and 2R to take reaction force, and in the driving position where the axis of the penetration part 8 is in the driving direction (up and down direction) as shown in Figure 1, the stroke operation of the lifting device 5 lowers pile P1, which is being gripped by the chuck device 6, together with the chuck device 6 and chuck frame 7, moving it downward (in the driving direction), driving pile P1 into the ground and obtaining the completed driving state shown in Figure 1. As a result, pile P1 becomes the leading pile in the pile row made up of existing piles.

[0017] Next, the pile P0 (press-in pile) is supplied. The pile P0 can be a long, ordinary steel pipe pile, but here we will explain using a segmented pile as an example. To achieve this, the mast 4 is rotated to position the chuck device 6 protruding to the sides of the pile rows P1, P2, P3, etc., as shown in Figure 2. In addition, as shown in Figures 3, 5A, and 5B, the chuck device 6 is tilted by the chuck tilting mechanism 9, causing the chuck device 6 to lie on its side. As a result, the axis of the penetration section 8 into which the pile is inserted becomes approximately horizontal, so the pile P0 is supplied in a lying position, inserted into the penetration section 8 while still lying on its side, and gripped by the chuck device 6. Specifically, as shown in Figure 5A, the chuck device 6 is positioned horizontally and protrudes from the side of the pile rows P1, P2, P3, etc. when the existing piles are viewed in the axial direction. Then, as shown in Figures 6A and 6B, the pile P0 is supplied horizontally, inserted into the chuck device 6, and gripped (pile supply process). In Figures 5A, 5B, 6A, and 6B, a pile transport device 20 that can travel along the pile rows and a pile supply device 30 that picks up the piles from the pile transport device 20 and supplies them to the chuck device 6 of the pile driving device 10 are used.

[0018] The pile P0 may be supplied using a crane. If the supply side can move the pile P0 horizontally along the pile row P1, P2, P3, etc., the pile P0 may be moved axially along the penetration portion 8 by this movement and inserted into the chuck device 6. Furthermore, the pile driving device 10 can be used to insert the pile P0 into the chuck device 6. This involves the stroke movement of the slide base 3 and the stroke movement of the lifting device 5. In the state shown in Figure 3, the stroke direction of the slide base 3 and the stroke direction of the lifting device 5 are oriented in the direction of inserting the pile P0 into the chuck device 6. Therefore, the pile P0 may be inserted into the chuck device 6 by the stroke movement of the slide base 3. Alternatively, the pile P0 may be inserted into the chuck device 6 by the stroke movement of the lifting device 5. As described above, the pile P0 is inserted into the chuck device 6 by performing one or more of the following actions: movement of the pile P0, stroke operation of the slide base 3, and stroke operation of the lifting device 5. In the pile supply process, it is possible to increase the insertion length of the pile P0 into the chuck device 6 by at least the stroke of the slide base 3. Similarly, in the pile supply process, the insertion length of the pile P0 into the chuck device 6 can be increased by at least the stroke of the lifting device 5.

[0019] Thus, once the pile P0 is gripped by the chuck device 6, the pile driving device 10 changes its position to one in which the pile P0 is driven into the ground by the rotation of the mast 4 and the tilting of the chuck device 6, as shown in Figure 4. Similar to the driving of pile P1, the pile driving device 10 grips the upper ends of existing piles P2 and P3 with clamp devices 2F and 2R to take reaction force, and then drives pile P0 into the ground by the operation of the lifting device 5. Once the pile P0 is partially driven in and sufficient bearing capacity has been achieved to support the weight of the pile driving device 10, the pile driving device 10 moves forward. The forward movement is as follows: The clamps by clamping devices 2F and 2R are released, and while the pile P0 supported by the ground is still held by the chuck device 6, the saddle 1 is raised by the operation of the lifting device 5. Furthermore, by the stroke operation of the slide base 3, the saddle 1 is moved forward, so that clamping device 2F is positioned above the existing pile P1 and clamping device 2R is positioned above the existing pile P2. The saddle 1 is then lowered by the operation of the lifting device 5, and the existing pile P1 is clamped by clamping device 2F and the existing pile P2 is clamped by clamping device 2R. As a result, the pile driving device 10 moves forward by one pitch, and the existing piles that take the reaction force during driving are switched to piles P1 and P2. Furthermore, if the pile at each press-in position is a connected pile (press-in pile) formed by longitudinally joining multiple segmented piles, the process involves connecting the multiple segmented piles (press-in piles) longitudinally at the same press-in position and continuing the press-in process. The forward movement of the pile press-in device 10 is performed with the uppermost segmented pile being gripped by the chuck device 6.

[0020] The pile driving device 10 clamps the existing piles P1 and P2 with the clamping devices 2F and 2R, then resumes driving in pile P0, completing the driving of pile P0. This corresponds to the completion of driving in pile P1 (one cycle prior) as described above, and the driving operation has advanced by one cycle. This is considered one driving cycle, and the driving cycle is repeated. In this way, the pile driving device 10 moves along the pile row made up of existing piles and continuously drives in piles, thereby executing a pile driving construction method that extends the pile row above ground.

[0021] Next, we will explain the details of the configuration and operation of the pile supply device 30. The pile supply device 30 is equipped with a pickup arm 30A that picks up and moves the pile while it is lying on its side. In this embodiment, the pickup arm 30A includes a swing arm 31. Both ends of the swing arm 31 are provided with hinged connecting parts 32 and 33 that can rotate around a vertical axis. The base end of the swing arm 31 is fixed to the saddle 1 via the hinged connecting part 32. The swing arm 31 swings in a horizontal plane by the hinged connecting part 32. The swing arm 31 has an extension and retraction function. A fork 34 capable of lifting and lowering a pile is provided at the tip of the swinging arm 31. The components are connected in the following order from the swinging arm 31 side: hinge connection 33, first lifting device 35, second lifting device 36, and fork 34. The hinge connection 33 allows the fork 34 to swing in a horizontal plane. Since the first lifting device 35 and the second lifting device 36 are connected in series, the fork 34 can be raised and lowered by the sum of the lifting stroke of the first lifting device 35 and the lifting stroke of the second lifting device 36.

[0022] The pile supply process using the pile supply device 30 will now be explained. As shown in Figures 5A and 5B, the pickup arm 30A is extended backward, maintaining the fork 34 at a height that allows it to be inserted into the pile P0. The forward movement of the pile transport device 20 inserts the fork 34 into the pile P0 (as shown in Figures 5A and 5B). Next, the fork 34 is raised to pick up the pile P0, and the pile P0 is positioned to the side of the pile row by rotating the hinge connections 32 and 33 by approximately 90 degrees, as shown in Figures 6A and 6B. The pile P0 is aligned with the height of the shaft of the penetration 8. As described above, the pile P0 is inserted into the chuck device 6, and the chuck device 6 grips the pile P0 and presses it into the ground.

[0023] [Holding Chuck Attachment] The following describes a pile driving construction method in which piles consisting of segmented piles (connected piles) are driven in using the holding chuck attachment 60 with the pile driving device 10 that has already been described. Figure 7 is a plan view of the holding chuck attachment 60, including its arrangement with respect to the pile driving device 10 and pile rows P1, P2, P3, etc., during pile driving construction. Figure 8 is a plan view, and Figure 9 is a side view. In this embodiment, the case where the segmented pile Pd is a steel pipe pile is illustrated. However, the target of press-in is not limited to steel pipe piles.

[0024] The retaining chuck attachment 60 is used when burying multiple segmented piles (press-in piles) Pd1, Pd2... (see Figures 10 to 18) sequentially while connecting them longitudinally by vertical joints. In the following description, segmented piles Pd1, Pd2... will be collectively referred to as "segmented pile Pd" unless there is a need to distinguish between them. Each segmented pile Pd has the same outer and inner diameter and is a short steel pipe pile in the longitudinal direction. The pressing operation of these segmented piles Pd (pressed piles) is carried out by repeatedly alternating between pressing them in and longitudinal splicing (connecting a new segmented pile to the upper end of a preceding segmented pile) to add a new segmented pile Pd (pressed pile).

[0025] The segmented pile Pd is suitable for use in areas with vertical restrictions, such as the aforementioned overhead restriction S0, when performing pile driving operations. The chuck device 6 uses segmented pile Pd of a length that avoids interference between the pile head and the overhead restriction S0 in the driving position. As mentioned above, in the case of segmented piles in the initial stages of press-in (for example, the first segmented pile Pd1), the stroke of the lifting device 5 may not be sufficient to reach the lower end of segmented pile Pd1 (press-in pile) with the ground, or the press-in depth may be insufficient, leading to instability and potentially preventing proper connection of the next segmented pile Pd2 (press-in pile). For this reason, a holding chuck attachment 60 is used to hold segmented pile Pd1. The holding chuck attachment 60 can be fixed to the pile head of the existing pile P1 (press-in pile), and below the chuck device 6, it stably grips the upper part of the segmented pile Pd1, enabling the connection of the next segmented pile Pd2 (press-in pile). Furthermore, the retaining chuck attachment 60 can also be attached to the chuck frame 7 of the pile driving device 10, and can be moved together with the pile driving device 10.

[0026] As shown in Figures 7 to 9, the holding chuck attachment 60 includes a frame 61 into which the segmented pile Pd can be loosely inserted in the vertical direction, a plurality of gripping mechanisms 62 for gripping the segmented pile Pd within the frame 61, a connecting frame 63 connected to the rear end of the frame 61, and a plurality of fixing clamping devices 64 provided on the connecting frame 63. The frame 61 and the multiple gripping mechanisms 62 constitute a holding chuck device.

[0027] The frame 61 is a roughly octagonal frame in plan view with wide openings at the top and bottom, and the segmented piles Pd can be loosely inserted inside it. Note that the plan view shape of the frame 61 is not limited to an octagon and can be any shape as long as it is possible to pass the segmented piles Pd through it.

[0028] There can be multiple gripping mechanisms 62, and there is no limit to their quantity, but in this embodiment, we will illustrate the case in which four gripping mechanisms 62 are provided on the frame 61. Each of the four gripping mechanisms 62 is provided on the frame 61 at uniform intervals along the circumference of a circle concentric with the opening center of the frame 61. Hereafter, the central axis of this concentric circle will be referred to as the central axis O of the frame 61. Each gripping mechanism 62 includes a concave gripping claw 621 that moves forward and backward toward the central axis O of the frame 61, and a hydraulic cylinder 622 (not shown) which acts as an actuator to impart forward and backward movement to the gripping claw 621.

[0029] The gripping claw 621 grips the segmented pile Pd by pressing the inside of its recess against the outer surface of the segmented pile Pd. For this reason, the inside of the gripping claw 621 has a contact surface that is processed to increase friction, such as by having irregularities or spike structures. The segmented pile Pd, which is loosely inserted vertically into the opening of the frame 61, is held in a state concentric with the central axis O of the frame 61 by the recesses of the four gripping claws 621, which move toward the central axis O, fitting into the outer surface of the segmented pile Pd.

[0030] The hydraulic cylinder 622 is, for example, a double-acting hydraulic cylinder and comprises a cylinder tube 623 and a piston rod 624. The piston rod 624 supports the gripping claw 621 at its tip. The hydraulic cylinder 622 is held in a frame 61 such that the piston rod 624 moves back and forth along the radial direction of the circumference centered on the central axis O.

[0031] The upper surface of the frame 61 has connecting parts 611 to 613 near both left and right ends and near the rear end, which are used to detachably connect the retaining chuck attachment 60 to the chuck frame 7 via brackets 66 (see Figure 11). Each of the connected parts 611 to 613 has a plate-like portion erected from the upper surface of the frame 61, and two or three through holes are formed horizontally through this plate-like portion. In contrast, the lower end of the bracket 66 has two plate-like portions into which the plate-like portions of each connected part 611 to 613 can be inserted, and these plate-like portions have two or three through holes formed horizontally through them, similar to the connected parts 611 to 613. The connected parts 611 to 613 are inserted between the two plate-like portions of the bracket 66 so that the through holes of the connected parts 611 to 613 and the through holes of the bracket 66 overlap, and connecting pins are inserted into the overlapping through holes to connect the through holes of the connected parts 611 to 613 to the bracket 66. The connecting pins are removable, which also allows for the separation of the through holes of the connected parts 611 to 613 from the bracket 66. Furthermore, in an arrangement corresponding to each of the connected parts 611 to 613, a connected part with the same structure as the connected parts 611 to 613 is also provided at the lower part of the chuck frame 7, allowing for connection and disconnection from the upper end of the bracket 66.

[0032] The holding chuck attachment 60, which is mounted on the lower part of the chuck frame 7 by the connected parts 611 to 613, is configured such that the arrangement of the connected parts 611 to 613 is such that the central axis O of the frame 61 and the gripping central axis CZ of the chuck device 6 are concentric. Therefore, with the holding chuck attachment 60 mounted on the lower part of the chuck frame 7, the chuck device 6 can grip the segmented pile Pd without any problems.

[0033] The connecting frame 63 has a pair of plate-shaped connecting arms 631 that extend forward from both the left and right ends of its front surface. In contrast, a pair of connecting brackets 65 corresponding to each connecting arm 631 are fixedly mounted on both the left and right ends of the upper rear surface of the frame body 61. As shown in Figure 9, each connecting arm 631 has multiple connecting holes 632 formed through it in the left-right direction, arranged in the front-rear direction at its lower end. In contrast, each connecting bracket 65 on the frame 61 side has two plate-like portions 652 into which the connecting arm 631 can be inserted from above, and these plate-like portions 652 have two connecting holes 651 formed in the same position when viewed from the side. Then, with the two connecting holes 651 of the connecting bracket 65 and the two connecting holes 632 of the connecting arm 631 overlapped, connecting pins are inserted into each overlapped through-hole to enable the connection of the connecting arm 631 (connecting frame 63) and the connecting bracket 65 (frame 61). Furthermore, each connecting arm 631 has more connecting holes 632 arranged in the front-to-back direction, and by sliding the connecting arm 631 in the front-to-back direction relative to the connecting bracket 65 and overlapping the other connecting holes 632 with the connecting holes 651 of the connecting bracket 65, the distance between the connecting frame 63 and the frame 61 in the front-to-back direction can be changed and adjusted.

[0034] In other words, the connecting arm 631 and the connecting bracket 65 constitute an adjustment mechanism that adjusts the distance between the fixing clamp device 64 and the holding chuck device. This allows the segmented pile Pd to be gripped in the correct position even when the pitches of the pile rows P1, P2, P3, etc. are different. Furthermore, since the connecting arm 631 is connected to the frame 61 via the connecting bracket 65, the holding chuck attachment 60 is fixed to the existing pile P, and the holding chuck device (frame 61) is lower than the fixing clamp device 64. As a result, the frame 61 and the segmented pile Pd1 are held at a lower position, and longer segmented piles Pd2 and beyond can be used.

[0035] The fixing clamp devices 64 are provided on both the left and right sides of the rear end of the connecting frame 63. Each fixing clamp device 64 has a downward-facing slit 641, into which the upper end (plate-shaped portion) of the pipe wall at the pile head of the existing pile P can be inserted from below. The two fixing clamp devices 64 are fixed in an inclined position relative to the rear end of the connecting frame 63, such that their respective slits 641 are aligned tangentially with the pipe wall of the existing pile P.

[0036] Each fixing clamp device 64 has two clamp units 642 that are positioned opposite each other with a slit 641 in between. The two opposing clamp units 642 each have a contact body 643 and a hydraulic cylinder 644, and each hydraulic cylinder 644 is, for example, a double-acting hydraulic cylinder and has a movable cylinder 645 and a piston rod 646. The piston rod 646 of the hydraulic cylinder 644 is supported by back pressure within a fixing clamp device 64, and the movable cylinder 645 moves back and forth hydraulically relative to the piston rod 646. The tip of the movable cylinder 645 is equipped with a contact body 643, which has a contact surface that has been processed to increase friction, such as by having irregularities or spike structures. The contact bodies 643 of the two clamp units 642 are arranged within the slit 641 with their contact surfaces facing each other. This allows the pipe wall of the existing pile P, which is inserted into the slit 641 from below, to be clamped by the contact bodies 643 of the two clamp units 642. Therefore, the two fixing clamp devices 64 clamp the pipe wall of the existing pile P at two locations, thereby stably fixing the holding chuck attachment 60 to the existing pile P.

[0037] [Pile press-in construction method] Figures 10 to 18 are process diagrams showing the pile driving method for segmented piles Pd using the holding chuck attachment 60, in sequence. The pile driving operation will be explained by referring to these figures.

[0038] As shown in Figure 10, the pile driving device 10 grips the upper ends of existing piles P2 and P3 with clamp devices 2F and 2R, the chuck device 6 is positioned on its side next to the pile row P1, P2, P3, etc., and the divided pile Pd1 (one of the driving piles) is supplied to the chuck device 6 from the pile supply device 30 (a crane may also be used if possible). When the segmented pile Pd1 (press-in pile), which will be the leading (deepest) part of the press-in process, is pressed in, the holding chuck attachment 60 is already mounted on the lower part of the chuck frame 7 via the bracket 66. The holding chuck attachment 60 holds the segmented pile Pd1 in a state where it is loosely inserted into the frame 61 of the holding chuck attachment 60 and is gripped by the chuck device 6. However, at this point, each gripping mechanism 62 of the holding chuck attachment 60 is not gripping the segmented pile Pd1.

[0039] Next, the stroking motion of the slide base 3 transports the segmented pile Pd1 to the target press-fitting position in front of the existing pile P1, and the rotation of the mast 4 moves the chuck device 6 to the front of the mast 4. Furthermore, as shown in Figure 11, the tilting of the chuck device 6 by the chuck tilting mechanism 9 sets the press-fitting position so that the gripping center axis CZ is in the press-fitting direction (up and down direction). In this case, if the retaining chuck attachment 60 is already attached to the existing pile P1, the lower end of the segmented pile Pd1 will interfere with the retaining chuck attachment 60 when the chuck device 6 is placed in the press-fitting position. For this reason, the segmented pile Pd1 must be sufficiently short so as not to interfere with the retaining chuck attachment 60. However, by attaching the retaining chuck attachment 60 to the lower part of the chuck frame 7, interference with the segmented pile Pd1 is avoided, and it becomes possible to select a longer segmented pile Pd1 even in environments where an overhead restriction S0 exists. For example, it is possible to select a segmented pile Pd1 that is close in length to the height from the ground to the overhead restriction S0.

[0040] Then, as the lifting device 5 performs a stroke motion in the downward direction, the chuck device 6 rotates the segmented pile Pd1 and presses it into place (press-in process). As a result, as shown in Figure 12, the holding chuck attachment 60 descends together with the chuck frame 7, and the pipe wall of the existing pile P1 enters the slit 641 of each fixing clamp device 64. At this stage, the rotation of the segmented pile Pd1 and the descent of the chuck frame 7 are temporarily stopped, and the retaining chuck attachment 60 is fixed to the pile head of the existing pile P1 using each fixing clamp device 64. Then, the connecting pin is pulled out to separate the retaining chuck attachment 60 from the chuck frame 7 (relocation process of the retaining chuck attachment).

[0041] Subsequently, the pile driving device 10 performs the upward movement of the gripping position by the chuck device 6 and the rotational driving of the segmented pile Pd1 one or more times, and as shown in Figure 13, when the segmented pile Pd1 is driven in to a height that the holding chuck attachment 60 can grip (for example, the same height as the existing pile P), the holding chuck attachment 60 grips the upper part of the segmented pile Pd1 with each gripping claw 621. Then, as shown in Figure 14, the pile driving device 10 releases the segmented pile Pd1 with the chuck device 6, tilts the chuck device 6 on its side to the side of the pile row P1, P2, P3..., moves backward, and receives the next segmented pile Pd2.

[0042] Subsequently, the segmented pile Pd2 (the other pile) is transported above segmented pile Pd1, and as shown in Figure 15, segmented pile Pd2 is placed in a press-in position above segmented pile Pd1. Furthermore, for the second and subsequent segmented piles Pd, since there is a retaining chuck attachment 60 fixed to the existing pile P1 and the preceding segmented pile Pd below them, shorter Pds are used than the leading segmented pile Pd1 to avoid interference with these. However, since the retaining chuck attachment 60 can be fixed to the existing pile P, it can be positioned at a lower location compared to the case where the retaining chuck attachment is always held on the pile driving device side. Therefore, by using the retaining chuck attachment 60, longer piles can also be used for the second and subsequent segmented piles Pd.

[0043] Meanwhile, the segmented pile Pd2, which is in the press-fit position together with the chuck device 6, is connected to the upper end of segmented pile Pd1 by a longitudinal joint (pile connection process). The longitudinal joint between segmented pile Pd1 and segmented pile Pd2 may be made by welding or the like. Also, if segmented pile Pd1 and segmented pile Pd2 have mechanical joints, these may be used to connect them. The mechanical joint is a joint that connects two segmented piles, Pd1 and Pd2, by providing one with a protruding and recessed structure and the other with a recessed and recessed structure and fitting them together. For example, one segmented pile Pd is provided with a bent groove that extends from the pile end in the longitudinal direction of the pile and then bends in the circumferential direction, and the other segmented pile Pd is provided with a fitting projection that fits into the bent groove. Then, by moving the other segmented pile Pd in ​​the longitudinal direction of the pile so that the fitting projection follows the bent groove, and then rotating it, the fitting projection reaches the deepest part of the bent groove, and the two segmented piles Pd can be connected. The pile driving device 10 can suitably connect segmented piles Pd having mechanical joints to each other through the stroke operation of the lifting device 5 and the rotational operation of the chuck device 6.

[0044] When the segmented pile Pd1 and segmented pile Pd2 are connected, the gripping state of segmented pile Pd1 by the holding chuck attachment 60 is released, and thereafter, segmented pile Pd1 and segmented pile Pd2 are rotated and pressed in as a single unit. The pile driving device 10 then performs the upward movement of the gripping position by the chuck device 6 and the rotational pressing of segmented pile Pd2 one or more times, and as shown in Figure 16, when the upper end of segmented pile Pd2 is pressed in to the target height (for example, the same height as the existing pile P), it is released from the chuck device 6. For subsequent segmented piles Pd, the same operation as segmented pile Pd2 is repeated.

[0045] Then, when the last (topmost) segmented pile Pdn is connected to the upper end of the segmented pile Pd immediately preceding it, before the press-in begins, or when the segmented piles Pdn have been pressed in to a height where the chuck frame 7 can be fitted with the retaining chuck attachment 60, the clamping state of the retaining chuck attachment 60 on the existing pile P1 is released, and the retaining chuck attachment 60 is connected to the chuck frame 7 by the bracket 66.

[0046] When the holding chuck attachment 60 is attached to the pile driving device 10, the pile driving device 10 moves forward. Specifically, as shown in Figure 17, the pile driving device 10, with the segmented pile Pdn gripped by the chuck device 6, releases the clamps on the existing piles P2 and P3 by the clamp devices 2F and 2R, and lowers the chuck frame 7 using the lifting device 5, thereby relatively raising the saddle 1, clamp devices 2F and 2R, slide base 3, and mast 4. Furthermore, by moving the slide base 3 backward, the saddle 1 and clamp devices 2F and 2R move forward relative to each other, and the lifting device 5 raises the chuck frame 7, lowering the saddle 1, clamp devices 2F and 2R, slide base 3, and mast 4, so that the clamp devices 2F and 2R can be inserted into and clamped onto the previous existing piles P1 and P2. As a result, the pile driving device 10 moves forward by one pitch of the pile row P1, P2, P3...

[0047] Then, the last (topmost) segmented pile Pdn is rotated and pressed into place, and once its top surface is aligned with the existing pile P1 (height adjustment), the last segmented pile Pdn is released from the chuck device 6. The pile driving device 10 tilts the chuck device 6 on its side to the side of the pile rows P1, P2, P3, etc., and moves backward. At this time, as shown in Figure 18, the retaining chuck attachment 60 is connected to the lower part of the chuck frame 7 by the bracket 66, and is therefore recovered as the chuck device 6 moves backward (retaining chuck attachment recovery process).

[0048] [Technical Effects of Embodiments of the Invention] The above-described retaining chuck attachment 60 is equipped with a fixing clamping device 64 that clamps the upper end of the existing pile P and fixes the retaining chuck attachment 60 to the existing pile P. Compared to the conventional technology in which the retaining chuck attachment 60 is held by the pile driving device 10, it becomes easier to hold the segmented pile Pd held by the retaining chuck attachment 60 at a lower position. As a result, interference between the next segmented pile Pd held by the pile driving device 10 and the retaining chuck attachment 60 becomes less likely, and it becomes possible to use a longer segmented pile Pd for that next segmented pile Pd.

[0049] Furthermore, since the retaining chuck attachment 60 has connecting parts 611 to 613 that can be connected to and separated from the pile driving device 10, it is possible to attach it to the pile driving device 10 without clamping the upper end of the existing pile P1. For this reason, when the retaining chuck attachment 60 is not used, such as when moving the segmented pile Pd1 to the driving position, the retaining chuck attachment 60 can be left mounted on the pile driving device 10. This makes it possible to avoid interference with the holding chuck attachment 60 when moving the leading segmented pile Pd1 to the target position for press-fitting, thus allowing the use of longer segmented piles Pd1.

[0050] Furthermore, since the retaining chuck attachment 60 has an adjustment mechanism to adjust the distance between the fixing clamp device 64 and the retaining chuck device (frame 61, etc.), it is possible to press-drive connected piles at various pile pitches.

[0051] Furthermore, since the retaining chuck attachment 60 has a slit 641 into which the fixing clamp device 64 inserts the plate-shaped portion of the upper end of the existing pile P from below, it is possible to attach the retaining chuck attachment 60 by utilizing the downward movement of the chuck frame 7 of the pile driving device 10, thereby simplifying the installation work and reducing the workload.

[0052] Furthermore, since the holding chuck attachment 60 is fixed to the existing pile P by the fixing clamp device 64, and the holding chuck device (frame 61, etc.) is positioned lower than the fixing clamp device 64, the segmented piles Pd held by the holding chuck attachment 60 can be positioned at an even lower position, making it possible to use longer segmented piles Pd for the next segmented pile Pd.

[0053] Furthermore, in the pile driving construction method, since the holding chuck attachment 60 fixed to the existing pile P has a pile connecting step in which the next segmented pile Pd2 is connected while the holding chuck attachment 60 is gripping the upper part of the leading segmented pile Pd1, it is possible to connect the segmented pile Pd2 even when the segmented pile Pd1 gripped by the chuck device 6 of the pile driving device 10 does not reach the ground or cannot be driven in to a depth where it can be erected in a stable state.

[0054] Furthermore, in the pile driving construction method, prior to the pile connection process, the pile driving device 10, with the holding chuck attachment 60 attached, positions the leading segmented pile Pd1, which is gripped by the chuck device 6, at the target position for driving, and also includes a relocation process in which the holding chuck attachment 60 is moved to the upper end of the existing pile P during the driving process. Therefore, when positioning the leading segmented pile Pd1 at the target location for press-in, the holding chuck attachment 60 is held by the pile press-in device 10, allowing the segmented pile Pd1 to be positioned in the space between the chuck device 6 and the ground, making it possible to use a longer segmented pile Pd than subsequent segments. In the above embodiment, the relocation process is illustrated as being carried out during the driving of the segmented piles Pd1. However, the relocation process is not limited to this, and may be carried out before the start of driving in the segmented piles Pd1.

[0055] Furthermore, the pile driving construction method includes a recovery step in which, after the driving of the last segmented pile Pdn of a connected pile composed of multiple segmented piles Pd is completed, the clamped state of the upper end of the existing pile P is released and the holding chuck attachment 60 is connected to the pile driving device 10 for recovery. Therefore, the retaining chuck attachment 60 can be removed from the existing pile P, which does not hinder the forward movement of the pile driving device 10, allowing for a smooth transition to the driving of the next connected pile and enabling efficient driving operations. Furthermore, the retrieval process of connecting the retaining chuck attachment 60 to the pile driving device 10 does not necessarily have to be performed after the completion of driving in the last segmented pile Pdn. Once any of the segmented piles Pd as driving piles are stably erected in the ground by driving, the retaining chuck attachment 60 may be connected to the pile driving device 10 and retrieved at any time thereafter.

[0056] [others] The embodiments of the present invention have been described above. However, the present invention is not limited to the embodiments described above. For example, a component integrally formed from a single member in an embodiment may be replaced with a component divided into multiple members that are connected or fixed to each other. Also, a component formed by connecting multiple members may be replaced with a component integrally formed from a single member. Furthermore, details shown in the embodiments can be modified as appropriate without departing from the spirit of the invention.

[0057] For example, while the example given illustrates a configuration in which the retaining chuck attachment 60 is attached to and detached from the pile driving device 10 using a connecting pin, the system is not limited to this. For instance, the attachment and detachment of the retaining chuck attachment 60 and the pile driving device 10 could be configured by providing the pile driving device 10 with an actuator capable of controlling the connection and separation, and performing the connection and separation of the retaining chuck attachment 60 in a fixed process as one of the operational controls of the pile driving device 10. This eliminates the need for manual connection and separation of the retaining chuck attachment 60, enabling overall automation of the work and improving work efficiency.

[0058] Furthermore, in this embodiment, a single control device may comprehensively control the pile driving device 10 and the holding chuck attachment 60 to coordinate their operations, or separate control devices may be provided for the pile driving device 10 and the holding chuck attachment 60, and these control devices may communicate with each other to coordinate their operations.

[0059] Furthermore, the two fixing clamp devices 64 of the holding chuck attachment 60 may be provided with adjustment means for adjusting their orientation around the Z axis and their mounting position in the XY plane relative to the connecting frame 63. Additionally, the number of fixing clamp devices 64 that can be mounted may be increased or decreased. In those cases, the retaining chuck attachment 60 can be attached to a wider range of existing pile shapes and sizes, thereby increasing the versatility of the retaining chuck attachment 60.

[0060] Furthermore, a driving device may be used when driving in the segmented piles Pd. The driving device is an attachment with the same outer diameter as the segmented pile Pd that can be attached to and detached from the upper end of each segmented pile Pd, and is intended to extend the gripping range of the segmented pile by the chuck device 6. The driving device can be attached and detached using, for example, hydraulics, and can be rotated and driven in together with the segmented pile Pd. When using a driving device, the process involves supplying the driving device to the chuck device 6 with the divided pile Pd attached, driving the divided pile Pd to the target height, and then separating and recovering it. [Explanation of symbols]

[0061] 1 Saddle 2F, 2R Clamping device 3. Slide base 4 Mast 5. Lifting device 6. Chuck device 7 Chuck Frame 9. Chuck tilting mechanism 10 Pile press-in device 60 Retaining Chuck Attachment 61 Frame 611~613 Connected part 62 Gripping mechanism 63 Connecting Frame 64 Fixing clamp device 641 Slit P,P0~P4 Piles (steel pipe piles) Pd, Pdn segmented piles (piles) Pd1 Divided pile (one of the piles) Pd2 Divided pile (the other pile)

Claims

1. A pile driving device that grips the upper end of an existing pile to take reaction force is used to drive two driving piles into the ground by connecting them longitudinally, and a holding chuck attachment is provided to hold the upper part of the driving pile that is preceding the driving pile by longitudinal connection, A fixing clamping device that clamps the upper end of an existing pile and fixes the holding chuck attachment to the existing pile, It has a holding chuck device that grips the upper part of the preceding press-in pile, A holding chuck attachment that holds the upper part of the preceding pile with the holding chuck device when the pile driving device connects a new pile that is joined longitudinally using a chuck device mounted on the pile driving device.

2. The retaining chuck attachment according to claim 1, having a connectable portion that can be connected to and separated from the pile driving device.

3. The retaining chuck attachment according to claim 1, further comprising an adjustment mechanism for adjusting the distance between the fixing clamp device and the retaining chuck device.

4. The fixing clamp device has a slit for inserting the plate-shaped portion of the upper end of the existing pile from below, as described in claim 1.

5. The retaining chuck attachment according to claim 1, wherein, when fixed to the existing pile by the fixing clamp device, the retaining chuck device is positioned lower than the fixing clamp device.

6. The holding chuck attachment according to claim 1, wherein the fixing clamping device clamps the upper end of another existing pile located between the preceding press-in pile and the existing pile gripped by the clamping device of the pile press-in device.

7. A pile driving method comprising using the holding chuck attachment described in claim 2 to connect driving piles together by longitudinal joints and driving them into the ground, A pile driving construction method comprising a pile connecting step, wherein the upper end of the existing pile is clamped, and the holding chuck attachment fixed to the existing pile grips the upper part of one of the driving piles, thereby connecting the other driving pile.

8. A process prior to the pile connection process, The pile driving method according to claim 7, wherein the pile driving device, with the holding chuck attachment attached, positions one of the driving piles at the target position for driving, and includes a relocation step of moving the holding chuck attachment to the upper end of the existing pile before the start of the driving or in the middle of the driving.

9. The pile driving construction method according to claim 7 or claim 8, further comprising a recovery step of connecting the retaining chuck attachment to the pile driving device and recovering it before or after the completion of driving in the last of the connected piles, which are formed by connecting press-in piles one after another by longitudinal joints.

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