JP2004052439A - Existing pile sinking method and sinking device for outside boring method of construction - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem wherein vibration is generated at the lower end of an existing pile and the inner wall surface of a previously formed vertical hole is broken in a current method of inserting an existing pile into the previously formed vertical hole by transmitting revolution and applying downward pressure to the upper end of the existing pile as an existing pile sinking method for an outside boring method of construction for boring a vertical hole and sinking the existing pile into the vertical hole in a foundation construction. <P>SOLUTION: Revolution is transmitted to the lower end of the existing pile to turn the existing pile around the shaft center thereof. The turning existing pile is pulled into the vertical hole by pulling the lower end of the existing pile downward. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for laying an existing pile, such as a concrete pile or a steel pipe pile, in a vertical hole (preliminary vertical hole) excavated by an earth auger excavator or the like in a construction foundation work or the like. And a sinking device used for the same.
[0002]
[Prior art]
Conventionally, a rotary drive device including a motor is suspended from an upright mast so as to be able to ascend and descend, and an upper end of the hollow concrete precast pile is mounted on an output shaft of the drive device in order to sink the ready-made pile in this kind of preliminary vertical hole. Using a device in which the parts are detachably connected so as to be capable of transmitting rotation via a connecting tool, while transmitting rotation to the upper end of the existing pile, pulling the drawn wire rope downward to the upper end of the existing pile. It is widely known that a submerged method in which an existing pile is pushed into a pre-installed vertical hole by applying a pressing force.
[0003]
However, in the above-described conventional apparatus and method, since the pile upper end is pressed and pushed down while transmitting the rotation to the upper end of the long existing pile, a run-out occurs at the lower end of the existing pile, This violently contacts the inner wall surface of the pre-installed vertical hole and causes the inner wall surface to collapse, resulting in a significant increase in the press-in resistance and rotational friction applied to the existing pile, which makes it difficult to push the existing pile, It was not unusual for rotation of the pile to become impossible, and eventually to breakage in the case of hollow concrete precast piles that were vulnerable to twisting.
[0004]
[Problems to be solved by the invention]
An object of the invention of claim 1 of the present application is to provide a method for depositing an existing pile, which enables sufficient settlement of an existing pile while preventing collapse of an inner wall surface of a pre-installed vertical hole,
It is an object of the invention of claim 2 of the present application to provide an existing pile setting device capable of effectively implementing the invention of claim 1.
[0005]
In addition, the inventions of claims 3 and 4 of the present application have an object to facilitate the insertion of an existing pile even when earth and sand remain in the pre-installed vertical hole,
Further, the invention of claim 5 of the present application has an object to suppress the occurrence of runout at the upper end of the existing pile when the existing pile is laid.
[0006]
[Configuration to achieve the task]
In order to achieve the above object, the invention of claim 1 of the present application
Transmitting the rotation to the lower end of the preformed pile to rotate the preformed pile about its axis,
The rotating preformed pile is pulled into the pre-installed vertical hole by pulling the lower end of the preformed pile downward.
Proposing a method for setting up existing piles in the external digging method,
[0007]
The invention of claim 2 of the present application
A rod to which rotation is transmitted from the rotation drive device is suspended from the support so as to be able to move up and down,
The above-mentioned rod is removably inserted into the hollow of a hollow preformed pile formed by vertically passing a hole through the axis,
The lower end of the rod and the existing pile was equipped with a locking tool for locking the two lower ends so that they can be rotationally transmitted to each other and disengaged in an axially immovable state,
We propose an existing pile setting device in the external digging method.
[0008]
The invention of claim 3 of the present application
At the lower end portion of the rod according to the invention of claim 2, a discharge port for a pre-formed pile subsidence auxiliary fluid is provided, and a pre-formed pile setting device is proposed.
The invention of claim 4 of the present application
At the lower end of the preformed pile, a plurality of excavating blades protruding outward from the outer peripheral surface of the preformed pile are protruded, to propose a preformed pile setting device,
Further, the invention of claim 5 of the present application
The present invention also proposes an existing pile submerging device, wherein at least an upper part of the rod according to the second or third aspect of the present invention is provided with a steadying means for suppressing run-out of the existing pile near the inner peripheral surface of the existing pile.
[0009]
The "rod" in the invention of claim 2 of the present application includes a hollow round bar, a square kelly bar, and various other bar materials.
As the "support", an upright mast, a jib, a boom, and various other types are used.
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0010]
【Example】
For convenience, an embodiment of the existing pile setting device will be described. In FIG. 1, a mast (2) vertically supported on a front end of a base machine (1) supports a rotary driving device (3) including a motor so as to be slidable up and down and hangs up and down by a wire rope (4). The upper end of the hollow rod (6) is connected to the rotary output shaft (5) of the driving device (3), and the upper end of the hollow rod (6) is hung down. (8), and the lower end of the rod (6) is engaged with the lower end of the existing pile (7) by the lock (9) so that the rotation of the rod can be transmitted and the rod cannot move in the axial direction. Removably locked and connected.
[0011]
(10) is a pulley attached to the back of the driving device (3), and pulls a squeezing wire rope (11) drawn from a winch (not shown) installed in the base machine (1) along the mast (2). Through the pulley (10).
[0012]
In the present example, the locking tool (9) comprises a locking cylinder (12) provided at the lower end of the rod (6) and a locking claw (13) provided at the lower end of the existing pile (7). As shown in FIGS. 2 (a) and 2 (b), the locking cylinder (12) has a short cylindrical main body (14) having both open ends which can be inserted into and removed from the hollow (8) of the existing pile (7). In the peripheral wall, three L-shaped locking grooves (15) cut in the generatrix direction 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), (16) having two rectangular plates are fixed to the diametrically opposed position in the middle portion of the inner peripheral surface with the bracket plate surface facing the diametrical direction. Similarly, rectangular plate-like support plates (17) and (17) are provided on the outer peripheral surface of the lower end portion of 6) at positions corresponding to the brackets (16) and (16), and these support plates (17) and (17) are provided. ) Are fixed to the brackets (16), (16) with bolts and nuts (18).
[0013]
On the other hand, as shown in FIGS. 3A and 3B, the lower end of the donut-shaped metal end plate (19) fixed to the lower end surface of the preformed pile is attached to the lower end of the preformed pile (7). In the locking groove (15), three bar-shaped locking claws (13) having detachable cross-sectional dimensions are arranged in a positional relationship corresponding to the locking groove (15). (8) Each is welded in a state of protruding in the centripetal direction.
[0014]
In this example, as a desirable means for laying down the long formed pile (7), as shown in FIGS. 1 and 4, the upper end and the intermediate part of the rod (6) are located close to the inner peripheral surface of the formed pile (7). There are provided three or more (four in the figure) steady rest plates having a width to be provided, each of which is projected radially from a generatrix position at equal intervals.
[0015]
At the lower end surface of the hollow rod (6), as shown in FIG. 2A, a discharge port (22) for an auxiliary fluid for laying piles such as air and water is opened, and the discharge port (22) is provided at the discharge port (22). An elastic valve (23) such as a rubber plate which is opened by internal pressure, and an auxiliary fluid supply pipe (24) communicating with the discharge port (22) is vertically passed through the hollow of the rod (6). An auxiliary fluid is externally pumped through (24).
[0016]
The operation of the above example will be described below together with the operation. The rod (6) is inserted into the existing pile (7), and the upper end of the rod (6) is connected to the drive output shaft (5). 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. The locking claws (13) are locked at the innermost part of the lateral groove of (15), and the formed pile (7) is also rotated in the same direction together with the rod (6).
[0017]
In this state, the existing pile (7) rotating while loosening the wire rope (4) is inserted into the pre-installed vertical hole (H). In this case, the existing pile (7) descends into the vertical hole (H) due to its own weight and the weight of the rod (6) and the driving device (3). What is necessary is just to add a retraction.
[0018]
In the process of inserting the preformed pile, rotation is transmitted from the rod (6) to the lower end of the preformed pile (7), and the lower end of the preformed pile (7) is pulled downward by the rod (6) to be drawn into the vertical hole. Therefore, even if the pile is relatively long, it will hardly cause a run-out at the top end of the pile, but even if a run-up occurs, the run-out plate (21) ... Thereby, there is no possibility that the inner wall surface of the vertical hole (H) collapses.
[0019]
In the case where sediment remains near the bottom of the pre-installed vertical hole (H) and hinders the settling of the existing pile (7) to a predetermined depth, water or the like 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 remaining sediment and facilitating the pressure of the existing pile (7).
[0020]
When the pre-made pile (7) is inserted at a predetermined depth in the pre-installed vertical hole (H), the locking pawl (13) is moved up to the vertical groove of the locking groove (15). Are retracted, and then the rod (6) is pulled out of the existing pile (7) by operating the wire rope (4).
[0021]
Another embodiment is an example of a device for laying a short-length ready-made pile, which is substantially the same as those shown in FIGS.
[0022]
As another means for facilitating the sedimentation of the existing pile when the earth and sand remains in the preliminary vertical hole (H), as shown in FIG. 4, each outer end of the locking claws (13). An example is also obtained in which the protrusion protrudes radially outward from the outer peripheral surface of 7), and the protruding portion is a cutting blade (25). According to this example, the earth and sand remaining in the vertical hole is excavated by the excavation blade (25) to a diameter larger than that of the existing pile, thereby enabling press-fitting of the existing pile.
[0023]
【The invention's effect】
According to the method of submerging piles in the external digging method of the invention of claim 1 of the present application, it is possible to suppress the occurrence of runout at the lower end portion of the preformed piles, which is observed in the conventional method, thereby moving the preformed pile into the pre-installed vertical hole. It is possible to sunk sufficiently while preventing collapse of the inner wall surface.
[0024]
According to the existing pile setting device in the external digging method of the invention of claim 2 of the present application, the invention of claim 1 can be effectively implemented.
[0025]
Further, according to the existing pile setting device in the external digging method according to the invention of claim 3 of the present invention, when the sediment remains in the pre-installed vertical hole to hinder the insertion of the existing pile, the existing pile setting auxiliary fluid is discharged. By discharging from the outlet, it is possible to assist sufficient insertion of the pre-built pile into the vertical hole,
[0026]
According to the existing pile setting device in the external excavation method of the invention of claim 4 of the present application, when earth and sand remain in the pre-installed vertical hole to hinder the insertion of the existing pile, the remaining soil is excavated by the excavation blade to remove the existing pile. Press-fitting can be made possible.
[0027]
Furthermore, according to the existing pile setting device in the external digging method of the invention of claim 5 of the present invention, even if the upper end portion of the pile attempts to run in the operation of setting the long existing pile, this is suppressed by the anti-sway means. Thus, collapse of the inner wall surface of the pre-installed vertical hole can be prevented.
[Brief description of the drawings]
FIG. 1 is a partial longitudinal side view of an existing pile setting device.
FIG. 2A is an enlarged vertical cross-sectional view of a locking part at a lower end of a rod.
(B) It is a partially notched enlarged front view of a locking cylinder.
FIG. 3 (a) is an enlarged bottom view of an existing pile.
(B) It is an enlarged longitudinal sectional view of the lower end of the existing pile.
FIG. 4 is a bottom view of an existing pile having a cutting blade.
FIG. 5 is an enlarged vertical sectional view of a part of the steadying means.
[Explanation of symbols]
2 Mast 3 Rotation drive device 6 Rod 7 Hollow preformed pile 8 Hollow 9 Locking device 13 Locking claw 15 Locking groove 25 Excavation blade

Claims (5)

Transmitting the rotation to the lower end of the preformed pile to rotate the preformed pile about its axis,
The rotating preformed pile is pulled into the pre-installed vertical hole by pulling the lower end of the preformed pile downward.
The method of setting up existing piles in the external digging method. A rod to which rotation is transmitted from the rotation drive device is suspended from the support so as to be able to move up and down,
The above-mentioned rod is removably inserted into the hollow of a hollow preformed pile formed by vertically passing a hole through the axis,
The lower end of the rod and the existing pile was equipped with a locking tool for locking the two lower ends so that they can be rotationally transmitted to each other and disengaged in an axially immovable state,
An existing pile laying device in the external digging method. The existing pile setting device according to claim 2, wherein a discharge port of the existing pile setting auxiliary fluid is provided at a lower end portion of the rod. The existing pile setting device according to claim 2, wherein a plurality of excavating blades projecting outward from an outer peripheral surface of the existing pile are protruded from a lower end of the existing pile. The existing pile setting device according to claim 2, wherein at least an upper portion of the rod is provided with a steadying means which is provided near the inner peripheral surface of the existing pile to suppress the deflection of the existing pile.

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