JPH02167918A - Vibrationless type crushed stone pile driver - Google Patents

Abstract

PURPOSE:To obtain high operating efficiency with small power by a method in which screw blades of several pitches are formed on the lower part of an inside screw and crushed stone arch-preventing projections are formed on the way of the shaft integrally with the shaft. CONSTITUTION:The hopper 5 of crushed stones 18 is set on the upper part of the casing 8 of a casing auger 7 and a motor 6 is set on the downside of the hopper 5. A motor 13 is fixed to the upper end of the casing 8, a given pitch of screw blades 11 are fixed to the lower part of the shaft 10, and a given pitch of paddle 15 is integrally formed on the upper part of the shaft 10. The auger 7 is hung down on given ground, and the ground is excavated through the auger 9. When a desired depth is reached, the stones 18 are charged from the hopper 5, and the motor 13 is reversely turned to open the stopper 12 in order to send and pack the stones 18 into the hole 17 smoothly. Operation of high efficiency can thus be made with small power.

Description

[Detailed Description of the Invention] <Industrial Application Field> The disclosed technology improves the water permeability of the target ground by forming crushed stone in the form of piles as a drain material in the ground such as soft ground, thereby preventing ground damage caused by earthquakes, etc. Technology for improvement work to prevent liquefaction Belongs to the technical field of improvement work.

<Summary of the gist> The present invention has a casing auger suspended by a wire or the like from the tip of a leader installed on a crawler type heavy machine, etc., which is connected to a rotating device such as a motor, and an inner screw is installed inside the casing auger. The upper part of the casing auger has a hopper for loading pile materials such as crushed stone, the lower part has a plug such as a shoe for penetrating into the ground, and the inner screw has a hopper for loading pile materials such as crushed stone. This invention relates to a vibration-free crushed stone pile driving device that continuously drives crushed stones into the ground as the casing auger is pulled up after penetrating into the ground, facing the plug body, and in particular,
The screw blades of the inner screw are formed by several pitches on the lower side of the shaft connected to the upper rotating device, and the screw blades of the several pitches are formed with a larger pitch on the lower side than on the upper side. A gap sufficiently larger than the size of the pile material such as crushed stone is formed between the outer end of the casing auger and the inner surface of the casing of the casing auger, and the upper shaft of the screw blade is equipped with a protrusion such as an arm type to prevent crushed stone arching. Pertains to a vibration-type crushed stone pile driving device whose body is integrally formed to prevent arching and to ensure that the pile material that is smoothly inserted is driven into the ground as the casing auger rises. It is an invention.

<Prior Art> As is well known, in Japan, which has a limited land area, effective use of land is an extremely important issue, and therefore, improvement of soft ground, etc. is an important technology subject to construction work.

Among these, for example, it is often observed that if the permeability of soft ground is poor, the ground may liquefy during an earthquake or the like, leading to a major disaster. Therefore, in order to deal with this problem, it is necessary to prevent this liquefaction phenomenon by improving the water permeability of the target ground, such as the soft ground.

Therefore, there is a technique to improve water permeability by driving a specified drain material into the target ground using heavy equipment.For example, in order to drive sand piles into the soft ground,
Special Publication No. 13271327 which improved this in 1984
There is an invention published in No. 12490, etc., in which sand piles are formed in the ground to improve water permeability.

<Problems to be Solved by the Invention> Conventionally, with regard to the double auger structure, the outer auger or, in some cases, the tip of the inner auger (sold separately) penetrates into the ground, and crushed stone is inserted between the two augers. The inner auger is rotated and crushed stone is discharged to create piles. At this time, the lid at the tip may be automatically removed and left in the ground, or it may be fixed to the tip of the inner auger and the inner auger shaft may be protruded downward to open the lid.

In such conventional technology, the screw of the inner auger is continuous all the way to the top, or even if there is a screw only at the bottom, the pitch is constant, so a large amount of power is required to discharge the crushed stone, and , the inner surface of the outer auger,
None of them had increased the gap between the tip of the inner screw blade, and none had taken into account the large amount of power consumed by the stone caught in between.

<Purpose of the Invention> The purpose of the present invention is to solve the problems of pile driving based on the prior art described above, and to solve the problem of pile driving based on the above-mentioned prior art. Drilling a specified pile hole in soft ground etc. and filling the hole with crushed stone etc. as pile material, moreover, reducing the resistance of the screw blade in the casing ocher when filling the pile material, reducing the power cost. The purpose of the present invention is to provide eight vibration-free crushed stone pile driving systems that are useful for the field of ground improvement technology in the construction industry by reducing the amount of vibration and allowing smooth filling of pile material.

〈Means and actions for solving the problem〉 According to the above purpose! ``In order to solve the above-mentioned problem, the structure of the invention of this application, whose gist is the scope of the claims, is to carry a crawler type or the like into soft ground or the like in a predetermined position, and run it along the leader with a wire or the like. A casing ocher is suspended, and the outer part of the casing ocher is rotated from the rotating attachment on the upper part, and a hole is drilled into the target ground through a stopper such as a shoe at the lower end of the casing, and a hole is drilled to a predetermined depth. After the construction is completed, the specified pile material, such as crushed stone, is input from the pile material input hopper at the top, and the rotating attachment at the top is rotated in the opposite direction to raise the casing auger to a specified height.
The plug body is opened or left in the ground, and the shaft of the inner screw installed inside the casing auger is rotated by another rotating device installed at the top, so that the lower side is exposed several pitches below the upper side. Crushed stones, etc., which are injected by the screw blades with a larger pitch, are force-fed and filled into the space formed below the lower end of the casing, and then the casing auger is continuously injected while being raised by the reverse rotation of the rotating device at the top. The screw blades of the inner screw are filled with crushed stone, etc., and the crushed stone pile is driven into place. During this time, the casing auger is raised by the reverse rotation of the rotating device, and the inner screw Since the screw blades extend downward and form only a few pitches, a gap larger than the size of the pile material such as crushed stone is formed between the outside of the screw blades and the casing of the casing auger. Therefore, the rotating power is small, and there is no jamming or clogging phenomenon between the screw impeller of crushed stone and the inner surface of the casing auger, and the feeding and filling of crushed stone etc. is always carried out. It is a technical measure that enables work to be carried out with low power and high efficiency.

<Embodiment> Next, one embodiment of the present invention will be described below based on FIGS. 1 to 10.

In the embodiment shown in FIG. 6, reference numeral 14 is a non-vibration type crushed stone pile driving device which is the center of the gist of the invention of this application. A specified crushed stone pile is driven and formed.

The leader 3 installed upright on the head of the heavy equipment 2 is connected to the first to fifth parts by wires 4 via the upper boob of the leader 3.
A casing auger 7 having a spiral ocher 9 as shown in the figure is suspended, and at the tip of the casing auger 7 (upper and lower ends in the figure) there are a plurality of plugs, for example, three that can be opened and closed. Shoe as a body 12.12.
There are 12 pivots.

At the top of the casing 8 of the casing auger 7, there is provided a hopper 5 for charging crushed stone 18 as a pile material, and at the bottom of the hopper 5, a motor 6 as a rotating device provided in the earth auger machine is provided. 1st after t2
As shown in the figure, a gear 16' fixed to the casing 8 of the casing auger 7 is engaged with the pinion 16 of the output shaft, so that the casing auger 7 can be rotated forward or reverse as specified. There is.

A motor 13 as another rotating device is fixedly installed at the upper end of the casing 8, and its output shaft is connected to a shaft 10 which is pivoted downwardly along the center of the casing auger 7.
Screw blades 11 are installed at a predetermined pitch at the lower part of the shaft 10, and paddles 15, 15 are installed at a predetermined pitch at the upper part as protrusions for preventing stone crushing. . . . are integrally provided and extend laterally.

In this embodiment, screw blades 11 with a plurality of pitches, for example, two pitches, are provided at the lower part of the shaft 10, and the pitches p+ and pz are larger on the lower side than on the upper side. The crushed stone 18 fed from hopper 5 is placed in hole 1.
7 so that it is easy to be smoothly pumped and filled.

Moreover, the gap d between the outer end of the screw blade 11 and the inner surface of the casing 8 of the casing auger 7 is a gap between the crushed stone 1
The size of the upper paddle 1 is made sufficiently larger than the size of the upper paddle 1 to prevent clogging between the screw blade 11 and the casing 8 of the casing auger 7.
5.15..., the crushed stone 18 is smoothly pumped within the casing 8 of the casing auger 7.

The pitch of the screw blades 11 is designed to be about 1/2 of the inner diameter of the casing 8 of the casing auger 7, so that the crushed stone 18 can be easily pumped, discharged, and filled into the drilled hole 17. This prevents the crushed stone 18 from clogging between the casing auger 7 and the casing 8 at the upper part.

It goes without saying that the embodiments of this invention are not limited to the above-described embodiments; for example, the plug body may be of a sword tip type instead of the shoe type described above and left in the ground 1, and various other methods may be used. The following aspects can be adopted.

Further, in terms of design changes, for example, for the anti-arching protrusions, protrusions 15' of other shapes may be added to predetermined parts of the shaft 10 at predetermined pitches in the axial direction as shown in FIG. 8, or protrusions 15' of other shapes as shown in FIG. A protrusion 15'' may be provided, and furthermore, as shown in FIG. 10, the shaft 10'' itself may be formed into a polygonal shape and the ridges thereof may be used as a shaft and a protrusion. It goes without saying that the crushed stone used is not limited to artificial crushed stone, but can also be applied to natural gravel or sand.

<Effects of the Invention> As described above, according to the invention of this application, piles made of crushed stone or gravel are basically formed in the ground to improve water permeability in order to prevent liquefaction of soft ground or the like due to earthquakes. In the equipment, the crushed stone is discharged, fed, and filled into the drilling hole as the casing auger is lifted from the hopper for loading pile materials such as crushed stone installed on the top of the casing auger using a screw blade. It has the effect of being able to feed without requiring a large amount of power, that is, a large torque, so there is no increase in power costs, there is no damage to the installation or failure due to overload due to clogging, and it is easy to maintain. This has the advantage of requiring less inspection and maintenance and improving the durability of the device.

In addition, by integrally attaching an anti-arching protrusion such as an arm to the top of the screw blade of the shaft, the pile material at the top prevents the crushed stone, etc. thrown in from the input hopper, from reaching the screw blade. Even when filled with crushed stone, the screw blades smoothly feed the crushed stone into the hole without causing any arging phenomenon due to IQ stirring, and this also prevents clogging of crushed stone in the casing of the casing auger. This provides the advantageous effect of preventing jamming and the like and allowing smooth feeding and filling of pile material.

[Brief explanation of the drawing]

1 to 10 are detailed explanatory views of the invention of this application, in which FIG. 1 is a schematic sectional view of the body of a casing auger according to an embodiment, FIG. 2 is a sectional view of the plug body in the closed position, and FIG. Figure 3 is a schematic side view of the fSS of Figure 1. Figure 4 is a schematic side view of the casing auger. Figure 5 is a transparent side view of the casing auger and inner screw. Figure 6 is vibration-free crushed stone pile driving. FIG. 7 is a cross-sectional plan view of the anti-arching body, and FIGS. 8, 9, and 10 are cross-sectional plan views of the anti-arching body of another embodiment. d...Gap, p+, p2...Pitch, 2...Heavy machinery, 6...Rotating device, 7.
... Casing auger 5 ... Crushed stone input hopper, 12 ... Plug body or shoe 14 ... Vibration-free crushed stone pile driving device, 11 ... Screw blade, 13 ... Rotating device, 1
0...Shaft, 15', 15", 15'...Arching prevention protrusion, 2...Heavy machinery, 6...Rotating device, 7...Casing auger 5...V? Stone IQ included Hopper, 12... Plug body or shoe 14... Vibration-free crushed rock pile driving membrane device, 11... Screw blade, 13... Rotating device, 1
0...Shaft, 45, 15', I5'...Arching prevention protrusion, d...Gap, l)+, D2...
Pitch, chart chart chart

Claims (5)

[Claims] (1) Vibration-free crushed stone pile driving device in which the outer casing auger, which is suspended from heavy machinery and linked to a rotating device, is equipped with an inner screw and faces the crushed stone input hopper and lower stopper at the upper part of the casing auger. In this case, the screw blades of the inner screw are formed with only a few pitches only in the lower part, and a protrusion for preventing arching of crushed stones (including paddles) is integrally formed with the shaft in the middle of the shaft connected to the rotating device. A non-vibration type crushed stone pile driving device characterized in that it is formed to extend laterally. (2) The vibration-free crushed stone pile driving device according to claim 1, wherein the pitch of the screw blades of the inner screw is larger from the upper side to the lower side. (3) A non-vibration stone crusher according to claim 1, wherein a gap larger than the size of crushed stone is formed between the outer end of the screw blade of the inner screw and the inner surface of the casing of the casing auger. Pile driving equipment (4) The non-vibration type crushed stone pile driving device according to claim 1, wherein the arching prevention protrusion is formed by a polygonal cross section of the shaft. (5) The non-vibration type crushed stone pile driving device according to claim 1, wherein the arching prevention protrusion (including the paddle) is separately fixed to the shaft.