JPS59413A - Formation of sand pile - Google Patents

Abstract

PURPOSE:To compact sand in both vertical and horizontal directions by a method in which the lower part of the flexible pipe in the axial portion of a hollow pipe is turned by means of the vertical vibration of an oscillator provided at the head of the hollow pipe for forming a sand pile and also of the horizontal vibration of a vibrator provided at the lower part of the hollow pipe. CONSTITUTION:A flexible lever 10 whose upper part is fixed to an oscillator 4 is hung down on the axial portion of a hollow pipe 9 provided with a vertically vibrating oscillator 4 for formation of a sand pile, and a horizontally vibrating vibrator 12 radially provided with plural compacting blades 13 is fixed to the lower end of the flexible lever 10 in such a way as to project it from the lower part of the hollow pipe 9. The flexible lever 10 is turned in such a way as to draw a small circle at its lower part by means of the vertical movement of the oscillator 4 and also of the horizontal movement of the vibrator 12, and sand charged into the hollow pipe 9 is discharged while being compacted in both vertical and horizontal directions. Thereby, a large-diameter, dense, and strong sand pile can be produced inside the hollow pipe 9 of such a small diameter.

Description

[Detailed Description of the Invention] Recently, the sand compaction pile construction method, in which sand piles are constructed in soft soil without compacting the sand, has been widely adopted in order to improve and strengthen soft ground. adopted a mechanism that compacts the sand discharged from the lower end of the hollow pipe for sand grain creation in the vertical direction, and since compaction in the diametrical direction of the sand pile was not sufficient, it was not possible to make a strong sand pile. In particular, it was not possible to adequately respond to the current trend of increasing the diameter of sand piles.

The method of the present invention solves the above-mentioned conventional drawbacks and provides a sand pile construction method that can sufficiently compact sand discharged from a hollow pipe not only in the vertical direction but also in the horizontal direction. .

Next, an example of an apparatus for carrying out the method of the present invention will be explained below with reference to the drawings.

An electric motor 3 and an exciter 4 driven by the electric motor 3 are installed at the head of a hollow tube 9 suspended from a suspension rope 1 via a spring 2. A flexible rod 10, which is equipped with a pie break 12 that vibrates in the direction, and whose upper end is fixed to the vibrator 4 at the head end of the hollow tube 9, is suspended.

The flexible rod 10 is made of a steel pipe or a synthetic resin pipe with an outer diameter of 5 to 20 cm and a length of 10 to 40 m depending on the thickness and length of the hollow tube 9. A vibrator 12, which vibrates horizontally by electric or hydraulic power, has a plurality of compaction jfs (13) installed vertically and radially at the lower end of the flexible rod 1O. If necessary, a plurality of R (not shown) may be attached to the intermediate portion of the flexible rod 10 with different phases.

A compressed air supply pipe 8 equipped with a hopper 5 for storing sand, etc. and an air release valve 7 is attached to the upper part of the hollow pipe 9, and the upper part of the hopper 5 has a hinge structure at the connection part with the hollow pipe 9. 11, and is provided with a check valve lid 6 configured to open only to the inside of the hollow tube 9 by a stopper 14 at the bottom, and when compressed air is blown from the inlet pipe 8, the lid 6 is closed by air pressure. When feeding sand from the hopper 5, the air release valve 7 of the inlet pipe 8 is opened to release compressed air, and the hollow pipe is opened.

When the air pressure in the tube 9 decreases, the loaded sand pushes open the lid 6 with its heavy duty and falls into the hollow tube 9.

As described above, the tube 9 is inserted into the hollow tube 9.
The sand discharged from below is compacted in the vertical direction at the lower end of the hollow tube 9 by the downward vibration of the vibrator 4 at the head of the hollow tube 9, and also by the vibration of the vibrator at the lower end of the flexible rod 10. 12 and the compaction blades 13 attached thereto, compaction is also carried out in the lateral direction.
0 is the vertical vibration of the head exciter 4 and the lower end vibrator 12
By directly receiving the horizontal vibration, a miso-sliding motion is induced in the lower part, and the compaction blades 13 provided in the lower end vibrator 12 come to rotate while drawing a small circle.

As a result, the discharged sand can be compacted widely in the horizontal direction, so according to the method of the present invention, it is possible to manufacture large-diameter dense and strong sand piles using small-diameter hollow tubes. .

Furthermore, according to the method of the present invention, the flexible rod 10 undergoes irregular bending motion due to the horizontal vibration of the vibrator 12 at the lower end, so it acts to give an impact to the sand thrown into the hollow tube, and the sand is thrown into the hollow tube. Not only can loose sand be compacted to some extent by the time it is discharged from below, but the sand that is thrown into the hollow tube can also be smoothly dropped downward into the hollow tube, resulting in the creation of sand clogging in the hollow tube. There are various advantages such as no need to worry about the sand pile breaking in the middle.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an example of an apparatus for carrying out the method of the present invention;
FIG. 2 is a sectional view taken along the line AA in FIG. 1. Code explanation

Claims (1)

[Claims] A flexible rod whose upper end is fixed to the vibrator is suspended from the axis of a hollow pipe for sand pile construction, which is equipped with an exciter that vibrates in the vertical direction at the head end, and the lower end of the flexible rod is A horizontally vibrating vibrator with a plurality of compaction blades attached radially is fixedly installed so as to protrude downward from the lower end of the hollow tube, and the vertical vibration of the vibration exciter and the lower end vibrator are fixed. A sand pile characterized in that the flexible rod is caused to rotate in a small circle at its lower part by horizontal vibration of the hollow pipe, thereby compacting the sand in the vertical and horizontal directions when discharging the sand put into the hollow pipe. How to create.