JPS6164925A - Method and apparatus for driving pile - Google Patents

Abstract

PURPOSE:To erectly set a thin wall pile into the ground by driving the pile while extending outwards many friction parts provided on the periphery of a rotary rod by means of an air bag and integrally turning the rotary rod and the pile. CONSTITUTION:Many friction parts 5 are connected through coil springs having inwardly pushing forces to the periphery of a rotary rod 1 tipped with a head 2. The longitudinal direction of the rod 1 is divided by sideward stabilizing plates 4 to quatersectionally divide the longitudinal area between upper and lower stabilizing plates 3 at a given interval. An air bag 8 to push out the friction parts 5 by air from an air pipe 13 is housed in a housing hole 6, and the rod 1 during excavation period is integrated with a pile 17 to be driven through the friction parts 5. After the pile 17 is driven to a given depth, while the driver is pulled up, a fluid solidifying agent is injected into the pile 17 and hardened. The construction work can thus be easily performed.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a method and device for driving piles, and in particular to a method for driving piles, and particularly for driving thin-walled steel pipe piles, spiral casings manufactured by Gen-Yang, hollow concrete piles, etc. Used for driving ready-made hollow piles.

[Conventional technology]

Methods for driving ready-made piles include driving the pile directly into the ground using a pile driving machine, or excavating the ground and embedding the pile into it, but the former method reduces pollution such as noise and vibration. Therefore, it is difficult to use it, especially in urban areas and residential areas.

The embedding method is the pre-poling method, in which a hole is drilled using a drilling machine such as an earth auger, and a ready-made pile such as a steel pipe pile or concrete pile is installed in the hole, or a rotating rod such as a ground auger is used between the inside of the hollow ready-made pile. There is a medium excavation method in which the pile is inserted, and the pile is erected while excavating the ground and removing soil from inside the pile. In the former case, bentonite mud may be used to stabilize the hole wall, or a ground hardening agent such as cement milk may be used. In addition, in the medium excavation method, cement milk, etc. is ejected from the tip of a rotating rod such as an earth auger, and mixed with earth and sand using stirring blades.
There are construction methods that harden the soil inside the pile and reduce the amount of soil removed.

[Problem that the invention seeks to solve]

However, the pre-poling method requires two steps: drilling with an earth auger and installing piles, and there are still problems with soil removal, equipment for collecting bentonite mud, and the need for processing.

In addition, when pouring thin steel pipes or spiral casings made on-site with both the pre-poling method and the digging method, there is a risk that it will be difficult to build due to resistance from the hole walls, or that the piles may become deformed. There is. In addition, there is a risk of damage to hollow concrete due to the surrounding earth pressure acting during RV'I construction.

This invention solves the problems mentioned above.
The object of the present invention is to provide a pile driving method and a pile driving device that are easy to construct and enable the construction of thin-walled steel pipes and hollow concrete piles.

[Failure to solve the problem]

In the pile driving method of this invention, a rotating rod of an excavator such as an earth auger is inserted into a hollow pile, and a large number of friction members disposed around the outer circumference of the rotating rod are pushed out in the diametrical direction to generate friction. The outer surface of the member is pressed against the inner peripheral surface of the hollow pile to be driven, and the rotating rod of the excavator and the pile are integrated via these friction members.

In this state, the drive motor of the excavator is activated, and the excavation head at the tip of the rotating rod can simultaneously excavate the stone and drive the pile.

Furthermore, when pulling out the rotating rod, it is also possible to inject a fluid solidifying agent such as mortar or cement milk into the inside of the stake and harden it while pulling up the rotating rod.

Hollow piles to be driven are particularly suitable for thin-walled hollow piles that are impossible or difficult to drive using conventional construction methods, such as thin-walled steel pipes with a thickness of about 1 to 4 mm and spiral casings made on-site with a thickness of about 1 to 2 mm. It is effective for That is, since it is built integrally with the rotating rod of the excavator via the friction member, deformation can be suppressed.

Even in the case of hollow concrete, since stress such as unreasonable twisting or bending is not applied to the hollow concrete body, damage during pile erection can be prevented, and the pile can be moved in parallel with excavation using a rotating rod. It can be poured into the ground.

Further, the pile driving device of the present invention is used directly to carry out the pile driving method of the above-mentioned invention, and includes a rotating rod having a digging head at the tip, and a coil spring or the like on the outer periphery of the rotating rod. It consists of a large number of friction members that are connected via elastic connecting members and can expand in the diametrical direction against the inward biasing force of the elastic connecting members. The friction member has a case shape with a substantially hollow fan-shaped cross section, and an air bag is housed inside. When no air is injected into the air bag, the friction member is drawn toward the rotating rod by the elastic connecting member, and can be freely moved in and out of the hollow pile.By injecting air into the air bag, the friction member It is pressed in a direction away from the hollow rod and is pressed against the inner peripheral surface of the hollow pile.

The friction member can be made of, for example, an iron plate or synthetic resin, and synthetic rubber or the like may be pasted on the outer surface so as to be in close contact with the hollow peg.

In addition, in place of the above-mentioned device in the method of driving piles, it is also possible to consider methods that have a hydraulic mechanism or link mechanism that allows the friction member to be brought into close contact with the hollow space, or a method in which the friction member itself is an air bag made of synthetic rubber or the like. [Example] The illustrated example will be described below.

FIG. 1 is a partially cross-sectional view of an example of the apparatus of the present invention, in which a large number of friction members 5 are provided around a rotating rod 1 having an excavating head 2 attached to its tip. As shown in FIGS. 3 to 8, each friction member 5 has a substantially fan-shaped cross section with a center top corner and a corner 900, and includes vertical stabilizing plates 3 and vertical stabilizing plates 3 arranged at predetermined intervals in the longitudinal direction of the rotating rod 1. In this embodiment, the friction member 5 is formed in the shape of a hollow case, and the inner surface on the rotating rod 1 side is A storage hole 6 for storing an air bag 8 is provided in the center, and storage holes 7 for storing a coil spring 9 above and below the hole 6 are provided.

The coil spring 9 connects the outer surface of the rotating rod 1 and the friction member 5, and acts to draw the friction member 5 toward the rotating rod 1 and reduce its diameter. On the other hand, the air bag 8 is injected with air through the air pipe 13 and expanded in the storage hole 6, thereby pushing the friction member 5 outward, and driving the outer surface of the friction member 5 into the peg 17. It can be pressed against the side. Furthermore, when the air in the air bag 8 is discharged, the friction member 5 is returned to its original position by the coil spring 9 and can be freely pulled out from within the stake 17. In addition, this embodiment has a comparatively small diameter pile 17.
In this case, the excavated soil is pushed out to the outer periphery by the excavation throat 2, so it takes t times to remove the soil. After driving the pile 17, a fluid solidifying agent kneaded on the ground is injected and solidified while the device is being pulled up.

Figure 2<a), (b), (C), (d)r
/'i shows various piles that can be driven by the method and apparatus of the present invention. That is, Fig. 2 (a
) is a thin-walled steel pipe pile 17 (thickness Imyn~3m1), and Fig. 2(b) is a spiral casing 18 (thick 11ILI11~211L1n) with unevenness formed on site.
), Fig. 2 (C) shows a perforated steel pipe (19 (thickness l)).
Figure 2 (d) shows the case of the hollow concrete pile 20, which is suitable for high water content soft ground, beet layers, etc.

Figures 9b and 10 show a device used for driving large-diameter piles, J flJ ', ir, in which a screw blade 15 that also serves as a stirring blade is formed around a rotating rod 1. The friction members 5 having an outer known center angle of 45° are arranged closely. Further, a drilling pit 2a is attached to the tip, and a solidifying agent can be injected through the hollow part of the rotating rod 2.

The embodiment shown in FIG. 11 is a case where the friction members 5 are arranged sparsely. However, if the distance between the friction members 5 becomes too large, the stakes 17 may be deformed by earth pressure or the like.

FIGS. 12(a), (b), and (C) show the method of processing the tip of the pile. After reaching the predetermined depth 17, the pile 17 and the rotating ronodoe are integrated via the friction member 5. The fluid solidifying agent 16 is
is pumped and filled. After injecting a predetermined amount of the solidifying agent 16, the piles 17 are allowed to sink in one piece and are stabilized at 4° on the support layer.

FIGS. 13(a), (b), and (C) show another method. After reaching a predetermined depth of depth, the friction member 5 is pulled toward the rotating rod 1, and the friction member 5 is pulled from the tip of the rotating rod 1. While injecting the fluid solidifying agent into 16 needles, only the rotating rod 1 is pulled up. After injecting a predetermined amount, the rotating rod 1 is pushed down again to stabilize it on the support layer.

〔Effect of the invention〕

A hollow pile and a rotating rod are integrated via a friction member,
Since the pile is pressed in from the inside by the friction member, the pile can be driven in step I, and stress such as undue twisting or bending is not generated on the pile during driving. Therefore, it is possible to easily construct piles with very thin walls or hollow concrete piles. Furthermore, the strength of the poles can be designed arbitrarily, and the strength can be confirmed on the ground. Furthermore, it can be used as a high-quality foundation pile without deformation or damage when building soil improvement pillars in high water content soft ground 1 (1).

[Brief explanation of drawings]

Figure 1 is a partially sectional front view of the pile driving device of the present invention, and Figures 2 (a), (b), (C)
, (d) is a sectional view showing various piles driven by the present invention, FIG. 3 is a partially enlarged front view of the device, FIGS. 4 and 5 are cross-sectional views, and FIG. 6 is a friction member. Fig. 7 is a cross-sectional view of the device, Fig. 8 is a perspective view of the friction member, Fig. 9 is a cross-sectional view of the device used for large-diameter stakes, and Fig. 10 is its cross-sectional view. A vertical cross-sectional view, FIG.
b), (C) is a sectional view showing an example of the construction procedure, 1st
3(a), (b), and (C) are cross-sectional views showing other examples of the construction procedure. l...Rotating rod, 2...Drilling head, 2a...Drilling bit, 3...Vertical stabilizer, 4...Horizontal stabilizer, 5...Friction: S material, 6...Storage hole, 7...・Storage hole, 8. Air bag, 9. Coil spring, 10. Air pipe hole, 11. Drive motor, 12. Hardening agent injection pipe, 13. Air pipe, 14. Double swivel. , 15
...Screw blade, 16..Solidifying agent, 17..Steel pipe pile, 18..Spiral casing, 19..Perforated steel pipe pile, 20..Hollow concrete pile. Section 3 1 Section 5111 11:z8tf Figure 11 Figure 12 [14 (a) (b)
(c)b Figure 13

Claims (5)

[Claims] (1) A large number of friction members disposed on the outer periphery of a rotating rod having an excavation head at its tip are pushed apart in the diametrical direction, the outer surface of the friction members is pressed against the inner circumferential surface of a hollow pile to be driven, and the rotation A method for driving a pile, comprising driving the pile to a predetermined depth while rotating the rod and the pile as one unit via the friction member. (2) The method for driving a pile according to claim 1, wherein the pile is a thin-walled steel pipe pile. (3) The method for driving a pile according to claim 1, wherein the pile is a hollow concrete pile. (4) A rotating rod having a digging head at its tip, connected to the outer periphery of the rotating rod via an elastic connecting member, and capable of expanding in diameter in the diametrical direction against the inward biasing force of the elastic connecting member. Consisting of a large number of friction members, the friction member has a substantially hollow fan-shaped cross section, and the expansion of an air bag stored inside the friction member pushes the friction member away from the rotating rod, causing the inner circumferential surface of the hollow pile to A pile driving device characterized by being capable of pressure welding. (5) The pile driving device according to claim 1, wherein the elastic connecting member is a coil spring.