Pile driving construction method, pile supply device and pile driving device

Abstract

In order to expand the utilization of a pile driving device to an area with lower overhead restrictions, the pile driving construction method is implemented by using a pile driving device (10) having a slide seat (1), a clamping device (2) for holding the upper end of an existing pile (P1-P4), a column (4) rotatably erected, and a chuck device (6) supported on the column via a lifting device (5) and holding the pile (P0), the existing pile is clamped by the clamping device to obtain a reaction force, the pile is clamped by the chuck device and pressed into the foundation by the lifting device, and the pile is moved on the pile row formed by the existing piles and the piles are continuously pressed, thereby extending the pile row on the foundation. The pile driving device is used to tilt the chuck device around a chuck tilting axis (CY) that intersects the column and is in the direction in which the column and the chuck device are arranged. The pile supplying step is performed in which the chuck device is tilted and extended sideways to the side of the pile row when the existing piles are viewed in the axial direction by the rotation of the column and the tilting of the chuck device, and the pile is supplied by tilting sideways and inserted into the chuck device for gripping.

Description

Technical Field

[0001] The invention relates to a pile driving construction method, a pile supply device and a pile driving device. Background Art

[0002] In the past, a pile driving device was used, which includes: a slide; a clamping device, which is arranged at the bottom of the slide and grips the upper end of the existing pile pressed into the foundation; a column, which is rotatably erected on the slide; a lifting device; and a chuck device, which is supported on the column via the lifting device and grips the pile.

[0003] The pile driving device obtains a reaction force by clamping the upper end of the existing pile pressed into the foundation with a clamping device, holds the pile with a chuck device and presses it into the foundation through the action of a lifting device, and moves on the pile row formed by the existing piles and continuously presses the piles, thereby extending the pile row on the foundation.

[0004] At this time, the pile is supplied to the chuck device using a crane or the like.

[0005] In the invention described in Patent Document 1, the chuck device is tiltably provided at the rear, and the pile can be erected by tilting the chuck device while the chuck device tilted rearward grips the end of the pile supplied in a sideways state.

[0006] Patent Document 1: Japanese Patent Application Publication No. 2020-148042

[0007] However, in areas where there are overhead restrictions such as bridge girders, when the pile is pressed in by the pile driving device, it is sometimes impossible to use a crane to supply the pile to the chuck device. In addition, there are also situations where the pile cannot even be inserted into the chuck device from above due to the relationship between the overhead restrictions and the length of the pile.

[0008] In the invention described in Patent Document 1, the chuck device clamps the front end of the pile placed horizontally on the pile driving device and tilts it 90 degrees to erect the pile. Therefore, when the pile is inserted into the chuck device, the positions of the pile and the chuck device are high, and the position of the rotation center when the pile is erected is high. Therefore, even if a method of supplying short piles one by one and adding them in the length direction to drive in a plurality of piles is adopted, it is considered that the pile driving device cannot be introduced in a site with a lower overhead restriction, for example, in a situation where the chuck device tilted backward interferes with the bridge girder, and the pile driving device may not be used. Summary of the invention

[0009] The present invention has been made in view of the above problems in the prior art, and an object of the present invention is to expand the usability of the pile driving device to an area with lower overhead restrictions.

[0010] One embodiment of the present invention for solving the above-mentioned problems is a pile driving construction method, which uses a pile driving device, which comprises: a slide; a clamping device, which is arranged at the lower part of the slide and grips the upper end of the existing pile pressed into the foundation; a column, which is rotatably arranged on the slide; a lifting device; and a chuck device, which is supported by the column via the lifting device and grips the pile, and the upper end of the existing pile pressed into the foundation is clamped by the clamping device to obtain a reaction force, and the pile is gripped by the chuck device and pressed into the foundation by the action of the lifting device. , moving on the pile row formed by the existing piles and continuously pressing the piles in, thereby extending the pile row on the foundation, characterized in that as the above-mentioned pile-pressing device, a pile-pressing device capable of tilting the above-mentioned chuck device around a chuck tilting axis intersecting the above-mentioned column and in a direction in which the above-mentioned column and the above-mentioned chuck device are arranged is used, and a pile supplying process is provided. In this pile supplying process, by the rotation of the above-mentioned column and the tilting of the above-mentioned chuck device, the above-mentioned chuck device is in a state of being tilted and extended to the side of the above-mentioned pile row when the existing piles are viewed in the axial direction, and the piles are supplied in a horizontal manner and inserted into the above-mentioned chuck device for gripping.

[0011] In addition, another embodiment of the present invention is a pile supply device that clamps the upper end of an existing pile to obtain a reaction force, and supplies the pile to a chuck device of a pile pressing device that holds the pile with a chuck device that can be raised and lowered and presses the pile into a foundation, wherein the pile supply device includes a pick-up arm that lifts the pile while keeping it in a horizontal state and moves the pile, and a fork that can lift and raise the pile is provided at the front end of the pick-up arm.

[0012] In addition, another embodiment of the present invention is a pile driving device, wherein the pile driving device comprises: the pile supply device; a slide; a clamping device, which is arranged at the lower part of the slide and grips the upper end of the existing pile pressed into the foundation; a column, which is rotatably erected on the slide; a lifting device; and a chuck device, which is supported on the column via the lifting device and grips the pile, and the base end of the pick-up arm is fixed to the slide, and the chuck device can be tilted around the chuck tilting axis intersecting the column and in the direction in which the column and the chuck device are arranged.

[0013] According to the present invention, the usability of the pile driving device can be expanded to areas with lower overhead restrictions. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a perspective view showing an implementation state of a pile driving construction method using a pile driving device according to one embodiment of the present invention.

[0015] Figure 2 It means from Figure 1 A stereogram of the scene you enter.

[0016] Figure 3 It means from Figure 2 A stereogram of the scene you enter.

[0017] Figure 4 It means from Figure 3 A stereogram of the scene you enter.

[0018] Figure 5A This is a top view showing the implementation status of the pile driving construction method at a site with overhead restrictions.

[0019] Figure 5B yes Figure 5A Side view of.

[0020] Fig. 6A It means from Figure 5A An overhead view of the scene you enter.

[0021] Figure 6B yes Fig. 6A Side view of.

[0022] Fig. 7A This is a top view showing the implementation status of the pile driving construction method on the water surface with overhead restrictions.

[0023] Figure 7B yes Fig. 7A Side view of.

[0024] Fig. 8A It is a top view showing the state of transportation of U-shaped steel sheet piles and picking up by a fork.

[0025] Figure 8B yes Fig. 8A Side view of.

[0026] Figure 8C yes Fig. 8A sectional view of .

[0027] Fig. 9 It is a cross-sectional view showing a state where a hat-shaped steel sheet pile is picked up by a fork.

[0028] Fig.10 It is a cross-sectional view showing a state where a concrete sheet pile is picked up by a fork.

[0029] Fig.11 It is a cross-sectional view showing the state of picking up the PC wall body by the fork.

[0030] Fig.12 The present invention is a perspective view showing the implementation of a pile driving construction method according to a pile driving device according to an embodiment of the present invention, showing the steps of making a column relative to Figure 2 The condition of tilting.

[0031] Fig.13 This is a top view of the retaining chuck accessory, also showing the arrangement during pile driving construction.

[0032] Fig.14 is a side view of the retaining collet assembly.

[0033] Fig.15 This is a process diagram of a pile driving construction method for split piles using a retaining chuck accessory.

[0034] Fig.16 It is immediately followed Fig.15 Process diagram of the pile driving construction method for split piles.

[0035] Fig.17 It is immediately followed Fig.16 Process diagram of the pile driving construction method for split piles.

[0036] Fig.18 This is a front view of the grip accessory unit in the posture when in use.

[0037] Fig.19 This is a front view of the grip accessory unit in a sideways state.

[0038] Fig. 20 It is a top view of the grip fitting unit in a sideways state.

[0039] Fig.21 This is a cross-sectional view of the support mechanism showing a state in which the restriction protrusion restricts the movement of the gripping fitting.

[0040] Fig. 22 It is a cross-sectional view of the support mechanism showing a state in which the restriction protrusion releases the restriction on the movement of the gripping fitting.

[0041] Fig.23 This is an explanatory diagram of a usage state of a grip attachment unit mounted on a pile driving device. DETAILED DESCRIPTION

[0042] An embodiment of the present invention will be described below with reference to the accompanying drawings. The following is an embodiment of the present invention and does not limit the present invention.

[0043] [Implementation of pile driving construction method (1)]

[0044] Figure 1 to Figure 7B The following describes an implementation status of a pile driving construction method using a pile driving device according to an embodiment of the present invention. Figure 1 to Figure 4 The operation of the pile pressing device in the pile supply process is shown in four scenes. Figure 5A , Figure 5B , Fig. 6A as well as Figure 6BTwo scenarios are shown for an on-site implementation situation where overhead restrictions exist. Fig. 7A and Figure 7B The figure shows the implementation status on the water surface with overhead restrictions. In order to clarify the direction, the left-right axis is the X-axis, the front-back axis is the Y-axis, and the up-down axis is the Z-axis, and the three orthogonal axes XYZ are shown in the figure.

[0045] In the following description, "existing pile" refers to a pile that has been pushed in and has not been pushed in any further regardless of the type of pile. In addition, "pressed pile" refers to a pile that is about to be pushed in or is in the process of being pushed in regardless of the type of pile.

[0046] In the case of split piles that are connected by longitudinal connection, split piles that are gripped by the chuck device 6 of the pile driving device 10 and are pressed into the foundation and are expected to be pressed by connecting new split piles by longitudinal connection are both equivalent to "pressed piles".

[0047] The longitudinal connection refers to connecting the ends of a plurality of piles arranged in series so as to align the longitudinal directions.

[0048] The pile driving device 10 comprises: a slide 1; a plurality of clamping devices 2F and 2R, which are arranged at the lower part of the slide 1 and grip the upper ends of the existing piles P1-P4, etc., which are pressed into the foundation; a sliding base 3, which is arranged to be horizontally movable on the slide 1; a column 4, which is erected on the sliding base 3 in a manner capable of rotating around the column rotation axis MZ; a lifting device 5; and a chuck device 6, which is supported on the column 4 via the lifting device 5 and grips the pile P.

[0049] The chuck device 6 is provided on the chuck frame 7 and is rotatable about the grip center axis CZ. The chuck device 6 can perform a rotation and press-fit method of rotating and pressing the pile while gripping the pile by rotating it.

[0050] The pile driving device 10 further includes a chuck tilting mechanism 9 , which can tilt the lifting device 5 together with the chuck device 6 and the chuck frame 7 about a chuck tilting axis CY intersecting the column 4 and in a direction in which the column 4 and the chuck device 6 are arranged.

[0051] The chuck device 6 and the chuck frame 7 are supported by the column 4 via the lifting device 5. The structure composed of the chuck device 6 and the chuck frame 7 has a through portion 8 into which the pile is inserted.

[0052] The plurality of clamping devices 2F and 2R are composed of the front clamping device 2F and the rear clamping device 2R. In addition, three or more clamping devices may be provided.

[0053] The slide base 3 slides in the front-rear direction. The rear clamping device 2R can also slide in the front-rear direction, and the interval between it and the front clamping device 2F is variable. Through this function, it can match the interval between the piles.

[0054] The pile driving construction method will be described starting from a state in which the upper end of an existing pile driven into the foundation is clamped by the clamping devices 2F and 2R.

[0055] Now, as shown in the figure, the upper ends of the existing piles P2 and P3 are clamped by the clamping devices 2F and 2R. Figure 1 In the figure, the pile P1 has been pushed in completely. However, if the description is made from the state where the pile P1 is held by the chuck device 6 and is in the middle of being pushed in, the clamping devices 2F and 2R clamp the upper ends of the existing piles P2 and P3 to obtain a reaction force, and as shown in FIG. Figure 1 As shown in FIG. 1 , in the pressing posture in which the axis of the through-portion 8 is in the pressing direction (up and down direction), the pile P1 held by the chuck device 6 is lowered (moved in the pressing direction) together with the chuck device 6 and the chuck frame 7 by the stroke action of the lifting device 5, and the pile P1 is pressed into the foundation, thereby obtaining Figure 1 Thus, pile P1 becomes the first pile of the pile row formed by the existing piles.

[0056] Next, pile P0 is supplied.

[0057] Therefore, by the rotation of the column 4, as Figure 2 As shown, the chuck device 6 is in a posture of extending to the side of the pile rows P1, P2, P3, etc.

[0058] In addition, if Figure 3 , Figure 5A as well as Figure 5B As shown, the chuck device 6 is tilted by the chuck tilting mechanism 9, so that the chuck device 6 is turned sideways. As a result, the axis of the through-hole 8 into which the pile is inserted becomes substantially horizontal, so that the pile P0 is supplied in a sideways state and is directly inserted into the through-hole 8 while being kept in the sideways state, so that the chuck device 6 holds it.

[0059] That is, Figure 5A As shown in FIG. 1 , the chuck device 6 is in a state of being tilted and extended to the side of the pile row P1, P2, P3, etc. when the original pile is viewed in the axial direction, and as shown in FIG. Fig. 6A and Figure 6B As shown, the pile P0 is fed horizontally and inserted into the chuck device 6 to be held (pile feeding process). Figure 5A , Figure 5B , Fig. 6A as well as Figure 6BIn the embodiment, a pile transporting device 20 capable of traveling on a pile row and a pile supplying device 30 for lifting a pile from the pile transporting device 20 and supplying the pile to the chuck device 6 of the pile driving device 10 are used.

[0060] The piles P0 may be supplied using a crane. When the piles P0 can be moved horizontally along the pile rows P1 , P2 , P3 . . . on the supply side, the piles P0 may be moved in the axial direction of the through-portion 8 and inserted into the chuck device 6 by the movement.

[0061] Furthermore, the pile P0 can be inserted into the chuck device 6 by the operation of the pile pressing device 10. This operation is the stroke operation of the slide base 3 and the stroke operation of the lifting device 5. Figure 3 In the state shown, the stroke direction of the slide base 3 and the stroke direction of the lifting device 5 are oriented toward the direction of inserting the pile P0 into the chuck device 6. Therefore, the pile P0 can also be inserted into the chuck device 6 by the stroke action of the slide base 3. In addition, the pile P0 can also be inserted into the chuck device 6 by the stroke action of the lifting device 5.

[0062] As described above, the pile P0 is inserted into the chuck device 6 by performing any one or two or more of the movement of the pile P0 , the stroke operation of the slide base 3 , and the stroke operation of the lifting device 5 .

[0063] In the pile supplying step, the insertion length of the pile P0 into the chuck device 6 can be obtained at least by the stroke of the slide base 3 .

[0064] Likewise, in the pile supplying step, the insertion length of the pile P0 into the chuck device 6 can be obtained at least by the stroke of the lifting device 5 .

[0065] In this way, if the pile P0 is held by the chuck device 6, Figure 4 As shown, the pile driving device 10 is transformed into a posture for driving the pile P0 into the foundation by the rotation of the column 4 and the tilting of the chuck device 6 .

[0066] Similar to the pressing of the pile P1 , the pile pressing device 10 obtains a reaction force by clamping the upper ends of the existing piles P2 and P3 by the clamping devices 2F and 2R, and this time the pile P0 is pressed into the foundation by the operation of the lifting device 5 .

[0067] When the pile P0 is pushed in halfway and a supporting force greater than or equal to the weight of the pile driving device 10 is obtained, the pile driving device 10 performs an advancing motion. The advancing motion is as follows.

[0068] The clamping by the clamping devices 2F and 2R is released, and the pile P0 supported on the foundation is held by the chuck device 6, and the slide 1 is raised by the action of the lifting device 5. The slide 1 is further moved forward by the stroke action of the slide base 3, so that the clamping device 2F is arranged above the existing pile P1, and the clamping device 2R is arranged above the existing pile P2. The slide 1 is lowered by the action of the lifting device 5, and the existing pile P1 is clamped by the clamping device 2F, and the existing pile P2 is clamped by the clamping device 2R. As a result, the pile pressing device 10 advances by one pitch, and the existing pile that received the reaction force during the pressing is converted into the piles P1 and P2.

[0069] In addition, when the piles at each push-in position are connected piles (pushing piles) in the longitudinal direction by connecting a plurality of split piles by longitudinal connection, the process of connecting a plurality of split piles (pushing piles) in the longitudinal direction at the same push-in position by longitudinal connection is entered to continue pushing in. The forward movement of the pile driving device 10 is performed in a state where the split pile at the uppermost end is gripped by the chuck device 6.

[0070] If the pile driving device 10 clamps the existing piles P1 and P2 by the clamping devices 2F and 2R, the pile P0 is started to be pressed again and the pile P0 is completed. This is equivalent to the completion of the pressing of the pile P1 (one cycle ago) and the pressing operation has been completed by one cycle. This is regarded as one pressing cycle and the pressing cycle is repeatedly performed. Thus, the pile driving device 10 performs a pile driving construction method in which the pile row formed by the existing piles is extended on the foundation by moving on the pile row and continuously pressing the piles.

[0071] like Figure 6B As shown, in the pile supply process, the central axis of the pile P0 inserted into the chuck device 6 is at a position lower than the top of the column 4. Therefore, the pile can be supplied and received in a lower space that the pile driving device 10 can enter, thereby expanding the utility of the pile driving device to an area with lower overhead restrictions.

[0072] Next, the structure and operation of the pile supplying device 30 will be described in detail.

[0073] The pile supply device 30 includes a pickup arm 30A that lifts and moves the pile while keeping it in a horizontally lying state.

[0074] In this embodiment, the pickup arm 30A includes a swing arm 31. Both ends of the swing arm 31 are provided with hinge connection parts 32 and 33 that can rotate around a vertical axis. The base end of the swing arm 31 is fixed to the slide 1 via the hinge connection part 32. The swing arm 31 swings in a horizontal plane via the hinge connection part 32. The swing arm 31 has a telescopic function.

[0075] A fork 34 capable of lifting and lowering a pile is provided at the front end of the swing arm 31. From the swing arm 31 side, the hinge connection part 33, the first lifting device 35, the second lifting device 36, and the fork 34 are connected in this order. The fork 34 can be swung in a horizontal plane by the hinge connection part 33. The first lifting device 35 and the second lifting device 36 are connected in series, so that the fork 34 can be raised and lowered by the amount of the lifting stroke of the first lifting device 35 plus the lifting stroke of the second lifting device 36.

[0076] A pile supplying process using the pile supplying device 30 will be described.

[0077] like Figure 5A and Figure 5B As shown, the pickup arm 30A is extended rearward along the pile row to a state where the fork 34 can be inserted into the pile P0 , and the arrival of the pile transporting device 20 is awaited.

[0078] As the pile transporting device 20 moves forward, the fork 34 is inserted into the pile P0 loaded on the pile transporting device 20 ( Figure 5A and Figure 5B status).

[0079] Next, the fork 34 is raised to lift the pile P0.

[0080] If the pile P0 is lifted by the fork 34, then Fig. 6A and Figure 6B As shown in FIG. 1 , the hinge connection part 32 and the hinge connection part 33 are moved approximately 90 degrees to arrange the pile P0 on the side of the pile row. At this time, the axial direction of the pile P0 is along the direction of the pile row, and the end of the inserted pile P0 opposite to the end of the fork part 34 protrudes forward (toward the chuck device 6). The height of the central axis of the pile P0 is aligned with the height of the axis of the horizontal through-portion 8.

[0081] As described above, the pile P0 is inserted into the chuck device 6 , and the pile P0 is gripped by the chuck device 6 and pressed into the foundation.

[0082] Each movable part of the pile driving device 10 and the pile supplying device 30 is provided with an actuator, and the pile driving device 10 is automatically controlled by the control device that controls the actuators in a unified manner, so that the pile driving device 10 is automatically controlled in the above-mentioned pressing cycle and the pile supplying operation by the pile supplying device 30. A sensor is provided that detects not only the amount of movement of the pile driving device 10 but also the amount of movement of each movable part of the pile supplying device 30, and by inputting the amount of movement of each movable part to the control device, accurate control (automatic pressing control, automatic pile supply control, interference prevention control, etc.) is achieved.

[0083] The control device also controls the rotation of the chuck device 6 around the grip center axis CZ and the tilting of the chuck device 6 around the chuck tilting axis CY, of course.

[0084] The control device has a limiting control function, which controls the rotation of the chuck device 6 around the grip center axis CZ so that the chuck device 6 can be tilted around the chuck tilt axis CY. Figure 3 In this way, the position where the chuck device 6 is lowered or raised becomes the specific position.

[0085] The chuck device 6 has a built-in hydraulic oil tank TK (in Figure 3 For example, when the working oil tank TK is raised to a higher position, the inlet and outlet provided in the working oil tank TK may rise to a position higher than the liquid level in the working oil tank TK, causing the inflow and outflow of the working oil in the working oil tank TK to be unfavorable. In such a case, the control device causes the working oil tank TK to be tilted around the chuck tilt axis CY. Figure 3 The position where the chuck device 6 is lowered in this way becomes the position where the hydraulic oil tank TK is located by controlling the rotation around the grip center axis CZ.

[0086] The pile driving device 10 is provided with sensors for realizing such control. One or more of the sensors are provided, for example, on the chuck frame 7 (for example Figure 3 In this case, the detected component detected by the sensor is set in the chuck device 6 (for example Figure 3 Detected component 52). Thus, it is possible to detect a specific rotation phase of the chuck device 6. In the above example, it is possible to detect at least whether the hydraulic oil tank TK is in the lowest phase due to the tilting around the chuck tilting axis CY. Figure 3 In order to make the illustration clear, the detected component 52 is shown at the 180° opposite side of the working oil tank TK, but the detected component 52 may be at this position or at the position of the working oil tank TK. Figure 3 The position of the detected component 52 is shown for explanation.

[0087] The lowered position (phase) is two positions, the left side position and the right side position of the chuck frame 7, depending on the tilting direction of the chuck device 6 around the chuck tilt axis CY. Figure 3 In the case of tilting by the opposite rotation, the right side portion of the chuck frame 7 becomes a lowered portion (phase), and therefore, the tilting about the chuck tilting axis CY is performed while the detected member 52 is detected by the sensor 51L. In the case of tilting by the opposite rotation, the left side portion of the chuck frame 7 becomes a lowered portion (phase), and therefore, the tilting about the chuck tilting axis CY is performed while the detected member 52 is detected by the sensor 51R. In this way, the pile driving device 10 has the above-mentioned limit control function corresponding to the tilting in both directions about the chuck tilting axis CY.

[0088] In addition, although it is expressed as "a lowered portion or an ascending portion", this is a problem of expression and is not intended to make a substantial distinction. This is because the portion to be lowered is the same as the portion 180° opposite to the portion to be lowered when the lowering is desired, and the portion to be ascended is the same as the portion 180° opposite to the portion to be ascended when the lowering is desired. The present invention is not limited to the case where there is a portion to be lowered as the chuck device 6 tilts around the chuck tilt axis CY, and can also be effectively applied to the case where there is a portion to be ascended (in the case where there is a portion that is not desired to be lowered, in the case where there is a portion that is not desired to be ascended). In addition, it can also be configured such that: in the case where there is a portion that is not desired to be ascended or descended as the chuck device 6 tilts around the chuck tilt axis CY, the portion ±90° of the portion is used as a specific portion, as the lowered portion or the ascended portion.

[0089] right Fig. 7A and Figure 7B The situation is described.

[0090] exist Fig. 7A and Figure 7B In the illustrated condition, the pile transporter 20 is traveling on the base 40 .

[0091] The pile transport device 20 travels on the base 40 and approaches the pile supply device 30. Figure 5A and Figure 5B Unlike the case of the pile P0 loaded on the pile transporting device 20, the pile P0 moves away from the pile row to the side. Figure 5A and Figure 5B The state in which the pickup arm 30A is extended rearward is used as a reference. Fig. 7A and Figure 7B As shown in FIG. 1 , the hinge connection part 32 is moved approximately 90 degrees toward the base 40 side and the hinge connection part 33 is moved approximately 90 degrees toward the opposite side. Figure 5A and Figure 5B Unlike the case of , the pile P0 loaded on the pile transporting device 20 is located below the upper end of the pile row. Figure 5A and Figure 5B Compare the situation, such as Fig. 7A and Figure 7B As shown, the fork 34 is arranged at a low level. In short, the fork 34 is controlled to a height that can be inserted into the pile P0.

[0092] As the pile transporter 20 moves forward, the fork 34 ( Fig. 7A and Figure 7B The rest are Figure 5A and Figure 5B , Fig. 6A and Figure 6B The same situation.

[0093] Furthermore, if the pile driving device 10 is located near the terminals S1 and S2 of the overhead limit S0 and the pile P0 can be supplied to the pile driving device 10 by a crane, the pile P0 may be supplied to the pile driving device 10 by a crane. In this case, the pile P0 is hoisted into the crane in a horizontally lying state.

[0094] Figure 5A and FIG. 5B to FIG. 7A and Figure 7B The figure shows a situation where the pile P0 is inserted into the chuck device 6 from behind the extending direction of the pile row in the pile supply process.

[0095] However, in the pile supplying step, the pile P0 may be inserted into the chuck device 6 from the front in the extending direction of the pile row.

[0096] It is also possible to configure such that when the pile driving device 10 approaches the terminal S1 of the upper limit S0, the pile P0 suspended from the crane is inserted into the chuck device 6 from the rear, and when the pile driving device 10 approaches the terminal S2 of the upper limit S0, the pile P0 suspended from the crane is inserted into the chuck device 6 from the front.

[0097] In addition, Fig. 7A and Figure 7B When the base 40 shown is arranged in front of the pile driving device 10 , the pile P0 may be inserted into the chuck device 6 from the front in the extending direction of the pile row.

[0098] By automating the operations of the pile driving device 10 , the pile transporting device 20 , and the pile supplying device 30 described above, it is possible to safely and efficiently implement a method for extending a pile row under overhead restrictions.

[0099] Next, the methods for dealing with various piles are explained.

[0100] exist Figure 1 to Figure 7B Although a steel pipe pile is shown as the pile in FIG. 1 , the present invention can be applied to various piles.

[0101] Figure 8A to Figure 8C The case of a U-shaped steel sheet pile PU is shown.

[0102] In order to cope with the U-shaped steel sheet pile PU, the fork portion is formed into two forks 34a and 34b, and the two forks 34a and 34b are inserted into the center of the U-shaped steel sheet pile PU to achieve balance. Figure 8A to Figure 8C In the state of the orientation of the loading state shown, the U-shaped steel sheet pile PU is lifted by the two forks 34a, 34b.

[0103] Furthermore, the work efficiency can be improved by loading a plurality of U-shaped steel sheet piles PU on the pile transport device 20. At this time, the two forks 34a and 34b are shaped to be inserted into the gap between the U-shaped steel sheet piles PU stacked up and down and loaded with a plurality of them, so that they can be smoothly lifted one by one by the two forks 34a and 34b.

[0104] In addition, for Fig. 9 The hat-shaped steel sheet pile PH shown can also be handled in the same manner. For the hat-shaped steel sheet pile PH, the positions where the two forks 34a and 34b are inserted are made to be below the arms on both sides. Other aspects can be handled in the same manner as the case of the U-shaped steel sheet pile PU.

[0105] In addition, for Fig.10 The flat plate-shaped concrete sheet pile PC shown can also be stably lifted by the two fork portions 34a and 34b.

[0106] In addition, for Fig.11 The cylindrical PC wall PP shown in FIG. Figure 1-7B The same is true for the steel pipe piles, which can be lifted by inserting a fork 34.

[0107] In particular, the U-shaped steel sheet piles PU and the hat-shaped steel sheet piles PH are structured so that a certain gap is formed in the upper and lower parts when they are stacked without interposing other parts in direct contact. By adopting two fork shapes that can be inserted into the gap, the loading and lifting operations of the U-shaped steel sheet piles PU and the hat-shaped steel sheet piles PH are both more efficient.

[0108] According to the above embodiment, there is a pile supplying step in which the chuck device 6 is tilted and extended to the side of the pile array P1, P2, P3, etc. when the original pile is viewed along the axial direction by the rotation of the column 4 and the tilting of the chuck device 6, and the pile P0 is tilted and supplied, and the pile P0 is inserted into the chuck device 6 and gripped by the chuck device 6, so that it is possible to Figure 1 and Figure 4 The pile is supplied to the chuck device 6 within the existing height range of the pile pressing device 10 in the pile pressing posture as shown.

[0109] As described above, the pile driving device 10 has the function of extending and installing a pile row by repeatedly driving piles and moving on the pile row by itself. The pile driving device 10 can certainly supply piles to the chuck device 6 through the above-mentioned pile supply process in a low-altitude area where piles can be driven and entered, so the pile driving construction will not be interrupted due to the inability to supply piles, and the pile driving construction can be continued, so that the pile row can be extended in the low-altitude area.

[0110] Therefore, the usability of the pile driving device can be expanded to areas with lower overhead restrictions.

[0111] Furthermore, the present invention is also useful in areas where there are no overhead restrictions or where there are fewer overhead restrictions but the space around the pile is limited.

[0112] That is, the present invention does not require a crane or other working machine for holding the pile that requires an area around the pile, and therefore is effective also in pile driving construction on water, sand, or the like.

[0113] In addition, in the above-mentioned pile driving device 10, the reaction force during pile driving is transmitted from the chuck device 6 to the column 4 via the chuck frame 7, the lifting device 5, and the chuck tilting mechanism 9, and further transmitted to the clamping devices 2F and 2R. At this time, a force is applied to the lateral side of the rotation axis in the chuck tilting mechanism 9, so there is a concern of damage due to the structure. In such a case, a connecting and fixing mechanism that connects and fixes the column 4 and the frame part of the lifting device 5 can be formed by a movable lock pin mechanism or the like. During the pressing action, by making the connecting and fixing mechanism into a connecting and fixing state, it is possible to prevent the chuck tilting mechanism 9 from being damaged. When the chuck tilting mechanism 9 is actuated, the connection and fixing based on the connecting and fixing mechanism is released.

[0114] In addition, it is preferred that the rotating parts (elevator 5, chuck device 6 and chuck frame 7) rotate in the narrowest possible space when the chuck tilting mechanism 9 is tilted. For example, it is preferably accommodated within the range of the total width of the pile driving device 10 as the diameter. This is to avoid interference with the upper air limit S0.

[0115] It is preferable to perform the final stage of the pile driving process by the pile driving device 10 and the initial stage of the pile supply process by the pile supply device 30 simultaneously and in parallel. For example, the pickup arm 30A is made to lift the next pile before the driving is completed. This improves the efficiency of the work and shortens the construction period.

[0116] In addition, the pile driving device 10 can tilt the column 4 around the column tilting axis MX in such a way that the chuck device 6 moves up and down. Fig.12 As shown in FIG. 1 , the column 4 is tilted about the column tilt axis MX, and the front end of the chuck device 6 on the opposite side to the column 4 is lowered.

[0117] Therefore, if Fig.12 As shown, the chuck device 6 can be held at a low position. In addition, when the chuck device 6 grips the pile, the chuck device 6 and the pile gripped by it can be held at a low position. In addition, as the column 4 tilts around the column tilt axis MX, the grip center axis CZ and the chuck tilt axis CY also tilt (the column rotation axis MZ has no effect).

[0118] In the above-mentioned pile supply process, except for the process of making the chuck device 6 fall sideways and extend sideways ( Figure 1 → Figure 2 → Figure 3), the process of inserting the pile into the clamping device 6 ( Figure 3 ), there is also a step ( ) in which the pile is raised by tilting the chuck device 6 around the chuck tilt axis CY from the state where the pile is gripped by the chuck device 6 in the pile supply step. Figure 3 → Figure 4 ), the column 4 is tilted around the column tilt axis MX so that the front end of the chuck device 6 is lowered on the opposite side of the column 4, and the chuck device 6, or the chuck device 6 and the pile it holds, are maintained in a low position.

[0119] This can prevent Figure 3 The highest part of the pile pressing device 10 (the side of the lifting device 5, etc.) and the upper end of the pile gripped by the chuck device 6 interfere with the upper limit S0.

[0120] As described above, the tilting function of the column 4 about the column tilting axis MX is used to perform the movement from the pressing position ( Figure 1 ) provides posture to the pile ( Figure 3 ) transition, from pile supply posture ( Figure 3 ) to the pressing posture ( Figure 4 ) can expand the utilization of the pile driving device to areas with lower overhead restrictions.

[0121] In addition, the tilting function of the column 4 around the column tilting axis MX can also be used during the process of inserting the pile into the clamping device 6 ( Figure 3 ) is adjusted in the whole or a part of the gripping center axis CZ. Thus, it is possible to suppress the contact between the chuck device 6 and the pile, and perform a good insertion action of the pile into the chuck device 6.

[0122] Furthermore, when the pickup arm 30A is used for supplying a pile, the axial position of the pile inserted into the chuck device 6 can be adjusted by the lifting function of the fork 34 and the extension and retraction function of the swing arm 31. Therefore, a wider range of adjustment can be performed in conjunction with the position adjustment operation of the grip center axis CZ.

[0123] [Implementation of pile driving construction method (2)]

[0124] Hereinafter, a pile driving construction method for driving piles (connection piles) composed of split piles (driven piles) using the holding chuck fitting 60 in the pile driving device 10 described above will be described.

[0125] Fig.13 1 is a top view of the pile driving device 10 and the arrangement of the pile rows P1, P2, P3, etc. during pile driving construction, and also includes a retaining chuck accessory 60. Fig.14 It is a side view.

[0126] In this embodiment, a case where the split pile Pd is a steel pipe pile is exemplified. However, the object to be pressed is not limited to the steel pipe pile.

[0127] The holding chuck attachment 60 holds a plurality of split piles (press-in piles) Pd1, Pd2, etc. (see Figure 15 to Figure 17 ) is used when the piles are buried in sequence while being connected in the length direction by longitudinal connection. In addition, in the following description, when there is no need to distinguish the split piles Pd1, Pd2, etc., they are collectively referred to as "split piles Pd".

[0128] Each split pile Pd is a steel pipe pile with equal outer and inner diameters and short in the length direction. The split piles Pd (pressed piles) are pressed in by alternately repeating the press-in and adding new split piles Pd (pressed piles) in the longitudinal direction.

[0129] The split pile Pd is suitable for performing pile driving work in an area with vertical restrictions such as the above-mentioned upper air restriction S0. The chuck device 6 uses a split pile Pd with a length that can avoid interference between the pile head and the upper air restriction S0 in the push-in posture.

[0130] On the other hand, in the case of the initial stage of driving the split pile (for example, the first split pile Pd1, etc.), if the lower end of the split pile Pd1 (driven pile) does not reach the foundation due to the stroke of the lifting device 5, or if the driven depth is insufficient and unstable, there is a concern that the connection operation of the next split pile Pd2 (driven pile) cannot be properly performed.

[0131] In such a case, the holding chuck fitting 60 is used to hold the split pile Pd1 (press-fit pile).

[0132] The chuck fitting 60 is fixed to the pile head of the existing pile P1 and the upper part of the split pile Pd1 is gripped below the chuck device 6, thereby stabilizing the split pile Pd1 and enabling the connection of the next split pile Pd2 (press-fit pile).

[0133] In addition, the holding chuck fitting 60 can also be mounted on the chuck frame 7 of the pile driving device 10 , and can also move together with the pile driving device 10 .

[0134] like Fig.13 and Fig.14 As shown, the retaining chuck accessory 60 comprises: a frame 61 into which the split pile Pd can be loosely inserted in the up-down direction; a plurality of holding mechanisms 62 for holding the split pile Pd in ​​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.

[0135] The frame 61 and the plurality of gripping mechanisms 62 constitute a holding chuck device.

[0136] The frame 61 is a frame having a generally octagonal shape in plan view and is widely opened in the upper and lower parts, and the partition piles Pd can be loosely inserted therein. The plan view shape of the frame 61 is not limited to an octagonal shape, but can be any shape as long as the partition piles Pd can pass therethrough.

[0137] The number of the gripping mechanisms 62 may be plural, and is not limited. However, in the present embodiment, a case where four gripping mechanisms 62 are provided in the frame body 61 is exemplified.

[0138] The four gripping mechanisms 62 are provided at equal intervals on the frame body 61 along the circumference of a circle concentric with the opening center of the frame body 61. Hereinafter, the central axis of the concentric circle is referred to as the central axis O of the frame body 61.

[0139] 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 (not shown) as an actuator that imparts the forward and backward movement to the gripping claw 621 .

[0140] The inner side of the recess of the grip claw 621 is pressed against the outer peripheral surface of the split pile Pd to grip. Therefore, a press-contact surface processed to increase friction such as concave-convex and spike-shaped structures is formed on the inner side of the grip claw 621.

[0141] The segment pile Pd loosely inserted into the opening of the frame 61 in the vertical direction has recesses of four grip claws 621 that move in and out toward the center axis O fitted into the outer peripheral surface of the segment pile Pd and held concentrically with the center axis O of the frame 61 .

[0142] The hydraulic cylinder is, for example, a double-acting hydraulic cylinder, and includes a cylinder tube and a piston rod. The piston rod supports the grip claw 621 at its front end. The hydraulic cylinder is held in the frame 61 so that the piston rod moves forward and backward along the radial direction of a circle centered on the central axis O.

[0143] The frame body 61 has connected portions 611 to 613 near both left and right ends and the rear end of the upper surface thereof. The connected portions 611 to 613 are used to connect the frame body 61 to the frame body 61 through the bracket 66 (see FIG. Fig.16 ) The retaining chuck accessory 60 is detachably connected to the chuck frame 7.

[0144] Each of the connected parts 611 to 613 has a plate-like part erected from the upper surface of the frame 61, and is formed with two to three through holes that penetrate the plate-like part horizontally. In contrast, the lower end of the bracket 66 has two plate-like parts into which the plate-like parts of the connected parts 611 to 613 can be inserted, and two to three through holes that penetrate horizontally in the same manner as the connected parts 611 to 613 are formed in these plate-like parts. Moreover, the connected parts 611 to 613 are inserted between the two plate-like parts of the bracket 66 in a manner that the through holes of the connected parts 611 to 613 overlap with the through holes of the bracket 66, and the connecting pins are inserted into the overlapping through holes, thereby connecting the through holes of the connected parts 611 to 613 to the bracket 66. The connecting pin can be pulled out, thereby, the through holes of the connected parts 611 to 613 and the bracket 66 can also be separated.

[0145] In addition, a connected portion having the same structure as the connected portions 611 to 613 is also provided at the lower portion of the chuck frame 7 in an arrangement corresponding to the connected portions 611 to 613 , and can be connected to and separated from the upper end portion of the bracket 66 .

[0146] The chuck holding fitting 60 mounted on the lower portion of the chuck frame 7 via the connected portions 611 to 613 sets the arrangement of the connected portions 611 to 613 so that the central axis O of the frame and the grip central axis CZ of the chuck device 6 become concentric.

[0147] Therefore, the chuck device 6 can hold the divided pile Pd in ​​a state where the holding chuck fitting 60 is attached to the lower portion of the chuck frame 7 .

[0148] The connecting frame 63 has a pair of plate-shaped connecting arms 631 extending forward from the left and right ends of the front surface thereof. In contrast, a pair of connecting brackets 65 corresponding to the connecting arms 631 are fixedly mounted on the left and right ends of the upper surface of the rear end of the frame body 61.

[0149] Each connection arm 631 has a plurality of connection holes 632 formed at the lower end thereof so as to be arranged in the front-rear direction and penetrate therethrough in the left-right direction.

[0150] On the other hand, each connection bracket 65 on the frame body 61 side has two plate-like parts into which the connection arm 631 can be inserted from above, and two connection holes 651 are formed in the same position in these plate-like parts when viewed from the side.

[0151] Then, by inserting a connecting pin into each of the overlapping through holes while overlapping the two connecting holes 651 of the connecting bracket 65 and the two connecting holes 632 of the connecting arm 631 , the connecting arm 631 (connecting frame 63 ) and the connecting bracket 65 (frame body 61 ) can be connected.

[0152] In addition, more connecting holes 632 are formed in each connecting arm 631 along the front-to-back direction. By sliding the connecting arm 631 relative to the connecting bracket 65 along the front-to-back direction so that other connecting holes 632 overlap with the connecting hole 651 of the connecting bracket 65, the mutual spacing between the connecting frame 63 and the frame body 61 in the front-to-back direction can be changed.

[0153] In other words, the connecting arm 631 and the connecting bracket 65 constitute an adjustment mechanism for adjusting the distance between the fixing clamp device 64 and the holding chuck device.

[0154] Thereby, even when the pitches of the pile rows P1, P2, P3, etc. are different, the divided piles Pd can be gripped at appropriate positions.

[0155] Furthermore, since the connecting arm 631 is connected to the frame 61 via the connecting bracket 65, when the holding chuck fitting 60 is fixed to the existing pile P, the holding chuck device (frame 61) is at a lower position than the fixing clamp device 64. Therefore, the frame 61 and the split pile Pd1 can be held at a lower position, and a longer split pile can be used as the split pile Pd after the split pile Pd2.

[0156] The fixing clamping devices 64 are provided on both left and right sides of the rear end portion of the connection frame 63 .

[0157] Each fixing clamping device 64 is formed with a downward slit 641, and can be inserted into the slit 641 into the upper end of the pipe wall in the pile head of the existing pile P. In addition, the two fixing clamping devices 64 are fixed in a state where each is inclined relative to the rear end of the connecting frame 63 in such a manner that the respective slits 641 are along the tangent direction of the pipe wall of the existing pile P.

[0158] Each fixing clamp device 64 includes two clamp units that are arranged to face each other with a slit 641 therebetween.

[0159] The two opposing clamping units have hydraulic cylinders, each of which has a movable cylinder and a piston rod. The piston rod is supported by maintaining back pressure in the fixing clamping device 64, and the movable cylinder moves forward and backward relative to the piston rod by hydraulic pressure.

[0160] The front end portion of the movable cylinder is provided with a press-contact body having a press-contact surface, and the press-contact surface is processed to increase friction, such as by having concavo-convex or spike-shaped structures.

[0161] Thus, the tube wall of the existing pile P inserted into the slit 641 from below can be clamped by the crimping bodies of the two clamping units.

[0162] Therefore, the two fixing clamping devices 64 clamp the pipe wall of the existing pile P at two locations, whereby the chuck fitting 60 can be fixed and held with respect to the existing pile P in a stable manner.

[0163] Figure 15 to Figure 17 The following are process diagrams sequentially showing a method of driving a pile using the split pile Pd that uses the retaining chuck fitting 60. The driving operation will be described with reference to these diagrams.

[0164] like Fig.15 As shown, the pile driving device 10 clamps the upper ends of the existing piles P2 and P3 by the clamping devices 2F and 2R, and the chuck device 6 is placed in a horizontal position on the side of the pile rows P1, P2, P3, etc., and the description starts from the state where the split pile Pd1 is supplied to the chuck device 6 by the pile supply device 30 (which may be a crane as long as it can supply piles).

[0165] When the split pile Pd1 (press-in pile) which is the beginning (deepest part) of the press-in is pressed, the holding chuck fitting 60 is previously mounted on the lower part of the chuck frame 7 via the bracket 66. The holding chuck fitting 60 is held by the chuck device 6 in a state where the split pile Pd1 is loosely inserted into the frame 61 of the holding chuck fitting 60. At this moment, each holding mechanism 62 does not hold the split pile Pd1.

[0166] Next, the split pile Pd1 is transported to the target push-in position on the front side of the original pile P1 by the stroke action of the slide base 3, and the chuck device 6 is moved to the front side of the column 4 by the rotation of the column 4. Fig.16 As shown, by tilting the chuck device 6 by the chuck tilting mechanism 9, a press-in posture is achieved in which the grip center axis CZ is in the press-in direction (vertical direction).

[0167] At this time, if the retaining chuck fitting 60 is first mounted on the existing pile P1, when the chuck device 6 is pushed into position, the lower end of the split pile Pd1 interferes with the retaining chuck fitting 60. Therefore, the split pile Pd1 has to be of a length that does not interfere with the retaining chuck fitting 60.

[0168] However, by installing the holding chuck fitting 60 at the lower part of the chuck frame 7, interference with the split pile Pd1 is avoided, and a longer split pile Pd1 can be selected even in an environment with an overhead restriction S0. For example, the split pile Pd1 can be selected to have a length close to the height from the foundation to the overhead restriction S0.

[0169] Then, the lifting device 5 performs a stroke operation in the descending direction, and the chuck device 6 rotates and presses the divided pile Pd1.

[0170] As a result, the holding chuck fitting 60 is lowered 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 .

[0171] At this stage, the rotation of the split pile Pd1 and the descent of the chuck frame 7 are temporarily stopped, and the holding chuck fitting 60 is fixed to the pile head of the existing pile P1 by each fixing clamping device 64. Then, the connecting pin is pulled out to separate the holding chuck fitting 60 from the chuck frame 7 (moving and setting step).

[0172] Thereafter, if the pile driving device 10 performs one or more upward movement of the gripping position of the chuck device 6 and the rotational push-in of the split pile Pd1, and continues to push-in until the holding chuck fitting 60 reaches a height at which the upper portion of the split pile Pd1 can be gripped, the holding chuck fitting 60 grips the upper portion of the split pile Pd1 with each grip claw 621.

[0173] Then, in the pile driving device 10, the chuck device 6 releases the divided pile Pd1, and is placed in a sideways state on the side of the pile rows P1, P2, P3, etc., and moves backward to receive the supply of the next divided pile Pd2.

[0174] Thereafter, the split pile Pd2 is moved to the top of the split pile Pd1, as shown in FIG. Fig.17 As shown in FIG. 1 , the split pile Pd2 is placed in a pushed-in position above the split pile Pd1 .

[0175] In addition, for the second and subsequent divided piles Pd, since the holding chuck fitting 60 fixed to the existing pile P1 and the previous divided pile Pd exist below them, divided piles shorter than the first divided pile Pd1 are used to avoid interference with them.

[0176] However, the retaining chuck fitting 60 can be fixed to the existing pile P, so the retaining chuck fitting 60 can be arranged at a lower position compared to the case where the retaining chuck fitting is always retained on the pile driving device side. Therefore, if the retaining chuck fitting 60 is used, a split pile longer in size than the second and subsequent split piles Pd can be used.

[0177] On the other hand, the split pile Pd2 which is in a pressed-in posture together with the chuck device 6 is connected to the upper end of the split pile Pd1. The split pile Pd1 and the split pile Pd2 may be connected by welding or the like. In addition, when the split pile Pd1 and the split pile Pd2 have a mechanical joint, the split pile Pd1 and the split pile Pd2 may be connected by the mechanical joint.

[0178] The mechanical joint is a joint in which concave-convex structures are provided on one side and the other side of the split pile Pd1 and the split pile Pd2 and they are connected by fitting. For example, a bending groove that bends in the circumferential direction from the pile end toward the pile length direction from the middle is provided on one split pile Pd, and a fitting convex part that fits with the bending groove is provided on the other split pile Pd. Then, the split pile Pd on the other side is moved along the pile length direction in such a way that the fitting convex part follows the bending groove, and then rotated, so that the fitting convex part can reach the deepest part of the bending groove and connect the split piles Pd on each other.

[0179] The pile driving device 10 can appropriately connect the divided piles Pd having mechanical joints to each other through the stroke operation of the lifting device 5 and the rotation operation of the chuck device 6 .

[0180] When the split pile Pd1 and the split pile Pd2 are connected, the gripping state of the split pile Pd1 by the holding chuck fitting 60 is released, and thereafter the split pile Pd1 and the split pile Pd2 are integrally rotated and pressed.

[0181] For the subsequent divided piles Pd, the same operation as that of the divided pile Pd2 is repeated.

[0182] Then, when the last (uppermost) split pile Pd is rotated and pressed in and aligned with the top end of the existing pile P1 (height adjustment), the last split pile Pd is released from the chuck device 6 .

[0183] Furthermore, the holding chuck attachment 60 is connected to the lower portion of the chuck frame 7 via the bracket 66 and is recovered (recovery step).

[0184] In addition, the recovery process of connecting the holding chuck fitting 60 to the pile driving device 10 may not be performed after the last split pile Pd is driven in. It may be configured such that when any of the split piles Pd as driven piles is stably erected on the foundation by being driven in, the holding chuck fitting 60 is connected to the pile driving device 10 and recovered at any time thereafter.

[0185] Thus, in the above-mentioned pile driving method, the holding chuck fitting 60 can clamp the upper end of the existing pile P1 and be fixed to the existing pile P1, so it is easy to arrange the holding chuck fitting 60 at a lower position than when it is held by the pile driving device 10. Therefore, in consideration of the interference with the holding chuck fitting 60, it is possible to use a split pile Pd longer than before for driving.

[0186] The retaining chuck fitting 60 can be mounted on the pile driving device 10 without clamping the upper end of the existing pile P1. Therefore, by mounting the retaining chuck fitting 60 on the pile driving device 10 when the first split pile Pd1 is pushed in, a longer split pile Pd1 can be used.

[0187] [Implementation of pile driving construction method (3)]

[0188] Hereinafter, a pile driving construction method (inter-pile water stopping construction method) for driving a small-diameter pile Ps using the grip attachment unit 70 in the pile driving device 10 described above will be described.

[0189] The method for driving piles to construct small-diameter piles Ps (a method for water-stopping between piles) is a method for water-stopping between piles by pressing small-diameter piles Ps having a smaller diameter than the original piles P into a concave position between the piles when viewed from above in order to block the gaps between the piles in the above-mentioned original pile rows P1, P2, P3, etc.

[0190] Fig.18 is a front view of the grip accessory unit 70 in the posture (standing state) when in use, Fig.19 is a front view of the gripping accessory unit 70 in a horizontally lying state, Fig. 20 This is a top view in the horizontal state. Fig.21 and Fig. 22 is a cross-sectional view of a support mechanism 74 described later, Fig.23 It is an explanatory diagram of a usage state of the grip attachment unit 70 attached to the pile driving device 10 .

[0191] The holding accessory unit 70 comprises: four holding accessories 71, which are individually assembled on the holding surfaces of multiple (for example, four) holding parts 601 of the chuck device 6 for holding and releasing by performing a gathering and dispersing action relative to the pile P and perform a gathering and dispersing action together with the holding parts 601; and a bracket 72, which supports the above-mentioned four holding accessories 71 so that they can perform a gathering and dispersing action.

[0192] The bracket 72 restricts movement in the diverging direction of the convergence and divergence action of at least the gripping fitting 71 located on one side of the gripping center axis UZ when the gripping fitting 71 is in the sideways state, and releases the restriction on movement in the diverging direction when the gripping center axis UZ is in the upright state.

[0193] The holding center axis UZ of the holding attachment unit 70 is an axis that passes through the centers of the four holding attachments 71 in the vertical direction, and is coaxial with the holding center axis CZ when the holding attachment unit 70 is held by the chuck device 6 .

[0194] The four gripping fittings 71 are arranged on the same circumference centered on the gripping center axis UZ. Each gripping fitting 71 includes a back plate 711 that contacts the gripping surface of the gripping member 601, a gripping plate 712 facing the gripping center axis UZ, and a main body block 713 that supports the back plate 711 and the gripping plate 712.

[0195] The back plate 711 is a plate having a peripheral surface along the holding surface of the holding member 601 , and can make substantially the entire outer surface in the radial direction around the holding center axis UZ contact the holding surface.

[0196] A locking claw 714 is provided at the upper end of the back plate 711. The locking claw 714 protrudes outward in the radial direction around the holding center axis UZ and the protruding front end faces downward. By inserting the upper end of the holding member 601 from the lower side of the locking claw 714, the holding accessory 71 can be completely locked to the holding member 601 by its own weight.

[0197] The holding plate 712 is a plate along the peripheral surface around the holding center axis UZ, and the surface on the holding center axis UZ side abuts against the outer peripheral surface of the small-diameter pile Ps to hold it.

[0198] The main body block 713 supports the back plate 711 and the grip plate 712 , and is supported by the bracket 72 so as to be movable in a radial direction around the grip center axis UZ.

[0199] Thus, each gripping fitting 71 performs a convergence and divergence operation with respect to the gripping center axis UZ together with each gripping member 601, thereby gripping and releasing the small-diameter pile Ps, and also enabling rotational pressing of the small-diameter pile Ps.

[0200] The bracket 72 includes an upper bracket 721 and a lower bracket 722 that respectively support the upper end and the lower end of each holding fitting 71 , and support columns 723 to 725 that integrally connect the upper bracket 721 and the lower bracket 722 at a predetermined interval in the vertical direction.

[0201] The upper bracket 721 and the lower bracket 722 are both in the shape of a flat plate, and an opening is formed in the center thereof so that the small-diameter pile Ps can be loosely inserted.

[0202] Each support column 723 to 725 is slightly longer than each holding bracket 71 in the vertical direction. Therefore, a certain gap can be formed between the upper end of the holding bracket 71 and the lower surface of the upper bracket 721 and between the lower end of the holding bracket 71 and the upper surface of the lower bracket 722.

[0203] Furthermore, support mechanisms 73 and 74 are provided between the bracket 72 and each gripping fitting 71 to enable movement of the gripping fitting 71 to move together or apart.

[0204] A support mechanism 73 is provided between the two holding fittings 71 on the support 723 side and the bracket 72 around the holding center axis UZ, and a support mechanism 74 is provided between the two holding fittings 71 on the opposite side of the support 723 and the bracket 72 around the holding center axis UZ.

[0205] The supporting mechanism 73 comprises: long hole-shaped guide holes 731, 732, which respectively penetrate the upper bracket 721 and the lower bracket 722; convex strips 733, 734, which protrude from the upper and lower ends of the holding accessory 71 and are inserted into the guide holes 731, 732; and widened portions 735, 736, which extend and protrude to the left and right at the upper ends of the convex strips 733, 734.

[0206] Each guide hole 731, 732 is formed along the radial direction around the grip center axis UZ, and guides the convex strips 733, 734 in the same direction. The convex strip 733 is inserted from below with respect to the guide hole 731, and the widened portion 735 is located on the upper side of the upper bracket 721. The convex strip 734 is inserted from above with respect to the guide hole 732, and the widened portion 736 is located on the upper side of the lower bracket 722.

[0207] In addition, the support mechanism 74 has guide holes 741, 742, convex strips 743, 744 and widened portions 745, 746 of the same structure as the support mechanism 73, and limiting protrusions 747, 748 for limiting the movement of the convex strips 743, 744 are provided on the diffusion direction side of the guide holes 741, 742 in the convergence and dispersion action.

[0208] The restricting protrusions 747 and 748 are convex strips protruding upward on both sides of the diffusion direction side of the guide holes 741 and 742, and are contacted by the widened portions 745 and 746 to restrict the movement of the convex strip portions 743 and 744 (gripping fitting 71) in the diffusion direction.

[0209] However, if Fig.21 As shown in FIG. 1 , a certain gap N is provided between the upper end of the holding accessory 71 and the lower surface of the upper bracket 721. Fig. 22 As shown, when the bracket 72 moves downward relative to the holding bracket 71, the widened portions 745 and 746 move upward relatively, and the convex strips 743 and 744 (holding bracket 71) can move to the diffusion direction side over the restricting protrusions 747 and 748.

[0210] A method of pile driving construction (water stopping construction method between piles) for driving a small-diameter pile Ps using the gripping fitting unit 70 having the above-described structure will be described in order of process.

[0211] The pile driving device 10 clamps the upper ends of the existing piles P3 and P4 using the clamping devices 2F and 2R to put the chuck device 6 in a sideways state, and inserts the sideways holding accessory unit 70 into the inner side of each holding member 601 of the chuck device 6 from the pile supply device 30 (which can also be a crane as long as it can supply piles).

[0212] At this time, if Fig.19As shown, the attachment unit 70 is grasped and inserted into the chuck device 6 in a sideways state with the support column 723 of the bracket 72 facing upward.

[0213] Thus, the two gripping metal fittings 71 supported by the support mechanisms 73 are located at the upper side, and the two gripping metal fittings 71 supported by the support mechanisms 74 are located at the lower side.

[0214] The holding accessory 71 supported by the supporting mechanism 73 moves toward the holding center axis UZ side due to its own weight, and the holding accessory 71 supported by the supporting mechanism 74 bears a load on the radial outside (below) due to its own weight, but is maintained on the holding center axis UZ side by the limiting protrusions 747 and 748.

[0215] Therefore, all the gripping metal parts 71 can be inserted into the chuck device 6 in a state where they are concentrated on the gripping center axis UZ side.

[0216] Assuming that all the supporting mechanisms are composed of a supporting mechanism 73 without limiting protrusions 747 and 748, the two holding accessories 71 on the lower side move radially outward due to their own weight, thereby interfering with the holding part 601 and making it difficult to insert them into the chuck device 6, which may cause damage or breakage due to contact. However, these situations can be suppressed and reduced by providing a supporting mechanism 74.

[0217] When the holding accessory unit 70 is inserted while each holding component 601 of the chuck device 6 is brought close to the back panel 711 side of each holding accessory 71, the upper end of the holding component 601 is inserted into the inner side of each locking claw 714, and each holding component 601 is connected to each holding accessory 71.

[0218] If the chuck device 6 is tilted from this state to make the gripping attachment unit 70 stand up, Fig.18 As shown in FIG. 1 , the bracket 72 moves downward by the gap N relative to each holding fitting 71 connected to each holding member 601 due to its own weight. As a result, the restricting protrusions 747 and 748 are moved downward by the gap N. Fig.21 The state of Fig. 22 The restriction is released, so all the holding accessories 71 can perform gathering and dispersion actions.

[0219] In this state, the chuck device 6 is again turned sideways, and the small-diameter pile Ps is inserted into the inner side of the gripping fitting unit 70 by the pile supply device 30 (or crane), and is gripped by each gripping member 601 and each gripping fitting 71 .

[0220] The subsequent rotational press-fitting operation of the small-diameter pile Ps is the same as that of the pile P. In the case of the small-diameter pile Ps, the small-diameter pile Ps is pressed into a position deviated in the left-right direction from the center of each pile P of the pile array P1, P2, P3, etc. Therefore, the column 4 is slightly rotated around the column rotation axis MZ to adjust the left-right direction position of the chuck device 6 to perform the rotational press-fitting operation.

[0221] In addition, when pile driving construction is performed in an environment with an overhead restriction S0, split piles (pressed piles) of small-diameter piles Ps are used. In this case, the pile driving construction is performed while alternately pressing the split piles (pressed piles) of the small-diameter piles Ps and adding the split piles (pressed piles) by longitudinal connection.

[0222] By using the above-mentioned holding fitting unit 70, the pile driving device 10 can rotate and press into a small-diameter pile Ps that cannot be held by the chuck device 6. The holding fitting unit 70 can restrict the movement of each holding fitting 71 in the diverging direction in the horizontal state by the support mechanism 74, so the operation of equipping the chuck device 6 with the holding fitting unit 70 can be easily and smoothly performed.

[0223] In the above embodiment, the gripping fitting unit 70 is exemplified as including the support mechanism 74 having the restriction protrusions 747 and 748 and the support mechanism 73 having no restriction protrusions. However, the present invention is not limited thereto, and the support mechanism 74 may be provided on all the gripping fittings 71 .

[0224] [Proposal related to the invention of a retaining chuck accessory]

[0225] Implementation of the above-mentioned pile driving construction method (2) and Figure 13 to Figure 17 The described embodiments relate to a retaining chuck attachment and a pile driving method using the retaining chuck attachment, and these have industrial applicability.

[0226] [Background Art of the Aforesaid Embodiments]

[0227] The pile driving device described in Japanese Patent No. 6854939 clamps the upper end of an existing pile driven into the foundation to obtain a reaction force, holds the pile and drives it into the foundation, moves on a pile row formed by the existing piles and continuously drives the piles, thereby extending the pile row on the foundation.

[0228] However, sometimes a connection pile that connects a plurality of piles is pressed in. The connection pile pressing operation is performed while repeatedly pressing in the pile before connection and adding (connecting) a new pile to connect.

[0229] In order to perform a continuous pile driving operation, a conventional pile driving device has a sub-chuck that can hold a previous pile below a chuck device that holds the pile, and the sub-chuck holds the upper end of the previous pile and the chuck device holds the next pile, and the sub-chuck and the chuck device are connected to each other (additional operation) to perform an integrated pile driving operation.

[0230] [Problems of the above embodiment]

[0231] However, in the above-mentioned pile driving device, the sub-chuck is arranged below the chuck device, and therefore there is a problem that only a shorter pile can be used in order to avoid interference with the sub-chuck.

[0232] The solution described below has been made in view of the above problems in the prior art, and the subject thereof is to press-in a pile having a longer size when the piles are connected and then pressed in.

[0233] [Solution to solve the problem]

[0234] Solution 1 for solving the above problems is a retaining chuck accessory, which retains the upper part of the above-mentioned push-in pile when the push-in pile and the push-in pile are connected by longitudinal connection and pressed into the foundation using a pile-driving device that clamps the upper end of the existing pile to obtain a reaction force, wherein the retaining chuck accessory comprises: a fixing clamping device that clamps the upper end of the existing pile to fix the retaining chuck accessory to the existing pile; and a retaining chuck device that holds the upper part of the above-mentioned push-in pile.

[0235] Solution 2 is a configuration of Solution 1, in which a connected portion is provided that can be connected to and separated from the pile driving device.

[0236] Solution 3 is constituted as follows: based on Solution 1, it has an adjustment mechanism for adjusting the distance between the above-mentioned fixing clamping device and the above-mentioned holding chuck device.

[0237] Solution 4 is configured as follows: based on solution 1, the fixing clamping device has a slit into which the plate-like portion of the upper end of the existing pile is inserted from below.

[0238] Solution 5 is configured as follows: based on Solution 1, in a state where the holding chuck device is fixed to the existing pile by the fixing clamp device, the holding chuck device is located at a lower position than the fixing clamp device.

[0239] Solution 6 is a pile driving construction method, which uses the retaining chuck accessory of Solution 2 to connect the driven piles with the driven piles through longitudinal connection and press them into the foundation, wherein the above-mentioned pile driving construction method has a pile connecting step, in which the above-mentioned retaining chuck accessory that clamps the upper end of the above-mentioned original pile and is fixed to the original pile connects the other above-mentioned driven pile while holding the upper part of the above-mentioned driven pile.

[0240] Solution 7 is constituted as follows: on the basis of Solution 6, there is a moving and setting process, which is a process before the above-mentioned pile connecting process. In this moving and setting process, the above-mentioned pile driving device equipped with the above-mentioned retaining chuck accessory arranges the above-mentioned one driven pile at the target position for driving, and moves and sets the above-mentioned retaining chuck accessory to the upper end part of the above-mentioned original pile before the start of driving or in the middle of driving.

[0241] Solution 8 is constituted as follows: based on Solution 6 or Solution 7, there is a recovery process, in which the above-mentioned retaining chuck accessory is connected to the above-mentioned pile driving device and recovered before or after the last press-in pile of the connected pile formed by connecting the press-in piles to the press-in piles by longitudinal connection is completed.

[0242] [Effect of the solution]

[0243] According to the above-mentioned solution, when the piles are connected and pressed in, it is possible to press in a pile having a longer size.

[0244] Industrial Applicability

[0245] The present invention has industrial applicability for a pile driving construction method, a pile supply device, and a pile driving device.

[0246] Description of Reference Numerals

[0247] P (P0-P4)... pile (steel pipe pile); 1... sliding seat; 2F, 2R... clamping device; 3... sliding base; 4... column; 5... lifting device; 6... chuck device; 7... chuck frame; 9... chuck tilting mechanism; 10... pile pressing device; 20... pile transport device; 30... pile supply device; 30A... picking arm; 31... swing arm; 32, 33... hinge connection; 34... fork; 34a, 34b... fork; 40... base.

Claims

1. A pile driving construction method, which uses a pile driving device, the pile driving device comprising: a slide; a clamping device, which is arranged at the lower part of the slide and holds the upper end of the existing pile pressed into the foundation; a column, which is rotatably erected on the slide; a lifting device; and a chuck device, which is supported on the column via the lifting device and holds the pile, The clamping device clamps the upper end of the existing pile that is pressed into the foundation to obtain a reaction force, and the pile is held by the chuck device and pressed into the foundation by the action of the lifting device, and the pile is moved on the pile row formed by the existing piles and the piles are continuously pressed, thereby extending the pile row on the foundation. It is characterized in that As the pile driving device, a pile driving device capable of tilting the chuck device about a chuck tilting axis in a direction intersecting the column and in which the column and the chuck device are arranged is used. The pile supplying step includes a step in which the chuck device is tilted and extended to the side of the pile row when viewed along the length direction of the existing piles by the rotation of the column and the tilting of the chuck device, and the piles are supplied by tilting them and inserted into the chuck device for gripping.

2. The pile driving construction method according to claim 1, characterized in that: In the pile supplying step, the piles are inserted into the chuck device from the rear in the extending direction of the pile row.

3. The pile driving construction method according to claim 1, characterized in that: In the pile supplying step, the piles are inserted into the chuck device from the front in the extending direction of the pile row.

4. The pile driving construction method according to any one of claims 1 to 3, characterized in that: The pile driving device includes a sliding base arranged to be horizontally movable on the sliding seat, and the column is rotatably erected on the sliding base. In the pile supplying step, the insertion length of the pile into the chuck device is acquired by the stroke of the slide base.

5. The pile driving construction method according to claim 4, characterized in that: The pile pressing device can make the lifting device and the clamping head device tilt together around the clamping head tilting axis. In the pile supplying step, the insertion length of the pile into the chuck device is acquired by the stroke of the lifting device.

6. The pile driving construction method according to claim 2 or 3, characterized in that: As the pile pressing device, a pile pressing device capable of tilting the column so as to move the chuck device up and down is used. In all or part of the step of inserting the pile into the chuck device in the pile supplying step, the column is tilted to adjust the height of the gripping center axis of the chuck device in the sideways state.

7. The pile driving construction method according to claim 1, characterized in that: This is a pile-pressing construction method that presses multiple split piles connected in the length direction into the foundation. The pile connecting step includes holding the upper end of the split pile which is the first to be pressed in by a holding chuck fitting which clamps the upper end of the existing pile and can be fixed to the existing pile, thereby holding the upper end of the split pile which is the first to be pressed in and connecting the next split pile.

8. The pile driving construction method according to claim 1, characterized in that: The clamping device has a plurality of gripping parts that perform a gathering and dispersing action relative to the pile. By means of a holding accessory unit, a pile of a smaller size than that which can be held by the chuck device is held and pressed in, the holding accessory unit comprising: a plurality of holding accessories mounted on the holding surface of the holding component and performing a gathering and dispersing action together with the holding component; and a bracket, at least for the holding accessories on one side located around the holding center axis, restricting movement in a diffusion direction of the gathering and dispersing action when the holding center axis is facing horizontally, and releasing the restriction on movement in the diffusion direction when the holding center axis is erected.

9. A pile supply device that clamps the upper end of an existing pile to obtain a reaction force, and supplies the pile to a chuck device of a pile pressing device that holds the pile with a chuck device that can be raised and lowered and presses the pile into a foundation, It is characterized in that A pick-up arm is provided, which lifts the pile while keeping it lying sideways and moves the pile, A fork capable of lifting the pile and performing lifting and lowering is provided at the front end of the pick-up arm.

10. The pile supply device according to claim 9, characterized in that: The fork portion is composed of at least two forks and has a shape that can be inserted into a gap between a plurality of steel sheet piles stacked up and loaded.

11. The pile supply device according to claim 9, characterized in that: The pickup arm has a hinge connection portion that enables the fork portion to swing in a horizontal plane.

12. The pile supply device according to claim 11, characterized in that: The pickup arm includes a swing arm that supports the hinge connection portion at a front end and swings in a horizontal plane.

13. A pile driving device, characterized in that: The pile pressing device comprises: The pile supply device according to claim 12; A slide; a clamping device disposed at the lower portion of the slide to hold the upper end of the existing pile pressed into the foundation; a column rotatably erected on the slide; a lifting device; and a chuck device, which is supported on the column via the lifting device and holds the pile. The base end of the pickup arm is fixed to the slide seat. The chuck device can be tilted about a chuck tilting axis that intersects the column and is in a direction in which the column and the chuck device are aligned.

14. The pile driving device according to claim 13, characterized in that: A sliding base is provided which is arranged to be horizontally movable on the sliding base, and the column is rotatably erected on the sliding base.

15. The pile driving device according to claim 14, characterized in that: The lifting device can be tilted together with the chuck device about the chuck tilting axis.

16. The pile driving device according to claim 15, characterized in that: The chuck device is rotatable around the gripping center axis of the chuck device, A control device is provided, wherein the control device controls the rotation and tilting of the chuck device, The chuck device has a working oil tank, The pile driving device has a sensor, which detects whether the working oil tank is in a lowered position of the clamping device when the clamping device is tilted. The control device has a limiting control function for controlling the rotation of the chuck device around the grip center axis and performing tilting of the chuck device in a state where the sensor detects that the hydraulic oil tank of the chuck device is in a lowered position.

17. The pile driving device according to any one of claims 13 to 16, characterized in that: The column can be tilted in such a way as to move the chuck device up and down.

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