JP3694879B2 - Prefabricated pile sinking equipment for external digging method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The invention of the present application is installation of prefabricated piles in an external excavation method in which prefabricated piles such as concrete piles and steel pipe piles are placed in vertical holes (preliminary vertical holes) previously excavated by an earth auger excavator or the like in construction foundation work About.
[0002]
[Prior art]
Conventionally, in order to sink a prefabricated pile in a pre-installed vertical hole of this type, a rotary drive device including a motor is suspended up and down in an upright mast, and the upper end of the hollow concrete prefabricated pile is mounted on the output shaft of the drive device. parts rotated to be able to transmit detachably connected via the connecting means, while transmitting the rotation to the upper end of the ready-made pile, by the tension of the diaphragm wire rope pressing force downward to the upper end of the ready-made pile added A sinking device that pushes an existing pile into a pre-installed vertical hole is widely known.
[0003]
However, in the above-mentioned conventional apparatus, the rotation is transmitted to the upper end of the long existing pile, and the upper end of the pile is pushed down and pushed down. The inner wall of the vertical hole is vigorously brought into contact with the inner wall, causing the inner wall to collapse.As a result, the press-fitting resistance and rotational friction applied to the existing pile are significantly increased, making it difficult to push the existing pile, and sometimes rotating the existing pile. However, it was not uncommon for the piles made of hollow concrete that were weak to twist to be damaged.
[0004]
[Problems to be solved by the invention]
The invention of claim 1 of the present application aims to provide a ready-made pile setting device that enables sufficient setting of a ready-made pile while preventing the collapse of the inner wall surface of the vertical hole.
[0005]
Moreover, the invention of claim 2 of the present application has an object to suppress this when there is a possibility that the upper end portion of the prefabricated pile is shaken when the long prefabricated pile is set.
[0006]
[Configuration to achieve the task]
In order to achieve the above object, the invention of claim 1 of the present application
Suspend and lift the rod that is transmitted rotation from the rotary drive device to the support,
The rod is removably inserted into the hollow of a hollow pre-formed pile formed by passing a hole having a diameter larger than that of the rod through the shaft ,
At the lower end of the rod, a short cylindrical locking cylinder having both end openings slightly smaller in diameter than the hollow hollow of the hollow preformed pile is concentrically fixed, and on the peripheral wall of the locking cylinder from the lower end upward in the direction of the generatrix. Cut and then form an L-shaped locking groove that bends in the circumferential direction,
A locking claw having a thickness that can be engaged and disengaged in the locking groove is formed at the lower end of the hollow preformed pile, and the claw tip can be locked in the centripetal direction in the preformed pile hollow with the locking groove. Fixed in a protruding state,
Proposed pre-built pile settling equipment in the outer digging method,
[0007]
The invention of claim 2 of the present application is
The prefabricated pile settling method in the outer excavation method according to claim 1, wherein three or more steady rest plates having a width close to the inner peripheral surface of the hollow prefabricated pile are radially projected at an upper portion of the rod. Propose the device.
[0008]
The “rod” in the first aspect of the present invention includes a hollow round bar, a square-axis kelly bar, and other various rods.
As the “support”, an upright mast, a jib, a boom, and other various types are used.
Embodiments of the present invention will be described in detail below with reference to the drawings.
[0009]
【Example】
In FIG. 1, a mast (2) vertically supported on the front end of a base machine (1) supports a rotary drive device (3) including a motor so as to be slidable up and down and is suspended up and down by a wire rope (4). The hollow rod of the hollow concrete prefabricated pile (7) to which the upper end of the hollow rod (6) is connected to the rotary output shaft (5) of the drive device (3) and hangs down and the rod (6) is to be laid down is supported. (8) The rod (6) is inserted into the lower end of the rod (6) to the lower end of the pre-made pile (7) by the locking tool (9) so that the rotation of the rod can be transmitted and the axial movement is impossible. Removably locked and connected.
[0010]
(10) is a pulley attached to the back surface of the drive device (3), and a squeezed wire rope (11) pulled out from a winch (not shown) installed in the base machine (1) along the mast (2). Then, it is led upward and is hung on the pulley (10).
[0011]
The said locking tool (9) consists of the latching cylinder (12) provided in the rod (6) lower end in this example, and the latching claw (13) provided in the existing pile (7) lower end. As shown in FIGS. 2 (a) and 2 (b), the locking cylinder (12) is formed of a short cylindrical body (14) having both end openings that can be inserted into and removed from the hollow (8) of the existing pile (7). In this example, three L-shaped locking grooves (15) that are cut in the direction of the generatrix from one end of the main body and then bent in the circumferential direction are opened at equal intervals in this example. A pair of brackets (16) and (16) having two rectangular plates are fixed at positions opposite to each other in the diametrical direction in the middle portion of the inner peripheral surface with the bracket temporary surface facing the diametrical direction, while the rod (6 A rectangular plate-like support plate (17), (17) is also provided on the outer peripheral surface of the lower end of the support plate at positions corresponding to the brackets (16), (16), and the support plates (17), (17) Are fixed to the brackets (16) and (16) by bolts and nuts (18).
[0012]
On the other hand, at the lower end of the prefabricated pile (7), as shown in FIGS. 3 (a) and 3 (b), the lower surface of the doughnut-shaped metal end plate (19) fixed in advance to the lower end face of the prefabricated pile is The three rod-like locking claws (13) having a detachable cross-sectional dimension in the locking groove (15) are placed in the shape of hollow piles at the positions corresponding to the locking grooves (15). (8) Each is welded in a state of projecting in the centripetal direction.
[0013]
In this example, as a desirable means for laying the long prefabricated pile (7), as shown in FIGS. 1 and 5 , close to the inner peripheral surface of the prefabricated pile (7) at the upper end portion and the middle portion of the rod (6) Are provided with three or more (four in the figure) steady-state plates (21) having a width to project radially from the positions of the buses spaced at equal intervals.
[0014]
As shown in FIG. 2 (a), the hollow rod (6) has a discharge port (22) for pile settling auxiliary fluid such as air and water, as shown in FIG. In addition, an elastic valve (23) such as a rubber plate that is opened by an internal pressure is provided, and an auxiliary fluid supply pipe (24) communicating with the discharge port (22) is vertically passed through the hollow of the rod (6). The auxiliary fluid is pumped from the outside via (24).
[0015]
The operation of the above example will be described next together with the work. In the sinking device of FIG. 1 in which the rod (6) is inserted into the pre-made pile (7) and the upper end of the rod (6) is connected to the drive device output shaft (5), the rod (6) is operated by inching and rotating. When the locking groove (15) of the locking cylinder (12) is engaged with the locking claw (13), and then the rod (6) is continuously rotated counterclockwise in FIGS. (15) ... The locking claw (13) ... is locked to the innermost groove of the transverse groove, and the pre-made pile (7) is then rotated in the same direction together with the rod (6).
[0016]
In this state, the pre-made pile (7) rotating while loosening the wire rope (4) is inserted into the pre-installed vertical hole (H). In this case, the prefabricated pile (7) descends into the vertical hole (H) due to the weight of the pile itself, the rod (6), and the driving device (3), but if it is difficult to descend, the squeezed wire rope (11) It is sufficient to add a retraction.
[0017]
In the above-mentioned pre-built pile insertion process, rotation is transmitted from the rod (6) to the bottom end of the pre-made pile (7), and the bottom end of the pre-made pile (7) is pulled downward by the rod (6) and pulled into the vertical hole. Therefore, even if it is a relatively long prefabricated pile, there is almost no occurrence of vibration at the upper end of the pile, but even if the vibration occurs, it is suppressed by the steady plate (21), Thereby, there is no possibility of collapsing the inner wall surface of the vertical hole (H).
[0018]
In addition, when earth and sand remain near the bottom of the pre-established vertical hole (H) and this impedes the sedimentation of the existing pile (7) to a predetermined depth, water is discharged through the supply pipe (24). The elastic valve (23) is opened from the outlet (22) and discharged into the vertical hole (H), thereby fluidizing the residual earth and sand and facilitating the pressure of the existing pile (7).
[0019]
When the pre-made pile (7) is inserted to a predetermined depth in the pre-installed vertical hole (H), the locking claw (13) is moved up to the vertical groove of the locking groove (15) by inversion reverse rotation of the rod (6). .. Is retracted, and then the rod (6) is pulled out from the existing pile (7) by operating the wire rope (4).
[0020]
The other embodiment is an example in which the other structure is substantially the same as that shown in FIGS.
[0021]
As another means for facilitating the sedimentation of the existing pile when the earth and sand remain in the pre-installed vertical hole (H), as shown in FIG. 4, the outer ends of the locking claws (13). An example is also obtained in which the projecting portion projects radially outward from the outer peripheral surface of 7), and the projecting portion is a drilling blade (25). According to this example, the earth and sand remaining in the vertical hole is excavated with a drilling blade (25).
[0022]
【The invention's effect】
According to the prefabricated pile sinking device in the outer digging method of the invention of claim 1 of the present application, it is possible to suppress the occurrence of the shake of the bottom portion of the prefabricated pile found in the conventional device , and thereby the prefabricated pile into the pre-installed vertical hole It is possible to sink sufficiently while preventing the inner wall surface from collapsing.
[0023]
Furthermore, according to the prefabricated pile laying device in the outer digging method of the invention of claim 2 of the present application, even if the upper end portion of the pile is about to sway in the work of laying the long prefabricated pile, this is suppressed by the steady plate . Thus, the inner wall surface of the pre-installed vertical hole can be prevented from collapsing.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a partially longitudinal side view of a prefabricated pile setting device.
FIG. 2 (a) is an enlarged longitudinal sectional view of a locking part at the lower end of the rod.
(B) It is a partially cutaway enlarged front view of the locking cylinder.
FIG. 3 (a) is an enlarged bottom view of an existing pile.
(B) It is an enlarged vertical cross-sectional view of the lower end portion of the existing pile.
FIG. 4 is a bottom view of a prefabricated pile having a drilling blade.
FIG. 5 is an enlarged longitudinal sectional view of a steadying means portion.
[Explanation of symbols]
2 Mast 3 Rotation drive device 6 Rod 7 Hollow preformed pile 8 Hollow 9 Locking tool
12 Locking cylinder 13 Locking claw 15 Locking groove 25 Drilling blade

Claims (2)

Suspend and lift the rod that is transmitted rotation from the rotary drive device to the support,
  The rod is removably inserted into the hollow of a hollow pile formed by passing a hole having a diameter larger than that of the rod through the shaft,
  At the lower end of the rod, a short cylindrical locking cylinder with both ends opening slightly smaller in diameter than the inside of the hollow preformed pile is concentrically fixed, and on the peripheral wall of the locking cylinder from the lower end upward in the direction of the generatrix. Cut and then form an L-shaped locking groove that bends in the circumferential direction,
  A locking claw having a thickness that can be engaged and disengaged in the locking groove is provided at the lower end of the hollow preformed pile, and the claw tip can be locked in the centripetal direction in the preformed pile hollow with the locking groove. Fixed in a protruding state,
Prefabricated pile settling equipment in the external digging method. The prefabricated pile settling method in the outer excavation method according to claim 1, wherein three or more steady rest plates having a width close to the inner peripheral surface of the hollow prefabricated pile are radially projected at an upper portion of the rod. apparatus.

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