JPH0823135B2 - Sand pile building equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sand pile forming apparatus used for a method of forming sand piles in soft ground to improve the soft ground.

[0002]

2. Description of the Related Art Conventionally, an apparatus of this type has a rotary casing, a fixed casing having an upper end portion communicatively connected to a sand supplying hopper and inserted into the rotary casing, and the fixed casing inserted into the fixed casing. And an inner rod for sand compaction that can move up and down, and while excavating to a predetermined depth in the ground while rotating the rotary casing by the rotation drive means, the sand is moved to the hopper by a bucket conveyor or the like that moves up and down along the leader. It is charged and supplied into the fixed casing, while the rotary casing is pulled out, the sand in the fixed casing is discharged from the lower end thereof, and the inner rod is moved up and down by the up-and-down driving means to make a sand pile in the ground. I am trying to create.

[0003]

In the sand pile forming apparatus of this type, when the rotary casing penetrates to the predetermined depth in the ground and then the sand is supplied into the fixed casing, the sand supplied to the fixed casing is removed. Since it is necessary to measure and supply the amount by the sand surface detector at a constant amount, as in the conventional device described above, a sand supply hopper is connected in series to the upper end of the fixed casing, and sand is supplied from this hopper. In an apparatus designed to directly fill and supply a fixed casing, the sand supply must be interrupted every time the sand amount is measured, and therefore the construction efficiency is very poor.

In view of the above problems, it is an object of the present invention to provide a sand pile forming apparatus capable of continuously and efficiently supplying sand into a fixed casing.

[0005]

The sand pile forming apparatus of the present invention comprises a rotary casing driven by a rotary drive means,
A fixed casing that is inserted into this rotating casing and has an upper end portion that is connected to and connected to a large-capacity sand storage tank,
The sand storage tank is divided into left and right tank parts by partition walls, and the upper end of each tank part is connected to the sand supply hopper through an opening / closing valve driven by an opening / closing drive means. It is characterized in that a pressure air supply means is provided in the upper part of the section.

[0006]

EXAMPLES Examples will be described with reference to the drawings.
FIG. 1 shows the entire sand pile forming apparatus according to the present invention,
In this figure, 1 is a machine frame suspended from the top of a leader (not shown) via a wire for raising and lowering operation (not shown) and supported so as to be vertically movable along a guide rail (not shown) of the leader. A large-capacity sand storage tank 2 having a large diameter and a long length is provided on the upper side of the machine frame 1, and a pair of sand supply hoppers 3 and 4 are provided on both upper sides of the tank 1. Reference numeral 5 denotes a cylindrical rotary casing that is rotatably connected to the lower portion of the machine frame 1 and is driven by a pair of rotary drive means 6 and 6 provided on the lower side of the machine frame 1. A large number of through holes 7 are formed in the entire area of the rotary casing, and a plurality of excavating blades 8 are integrally provided on the lower end of the rotary casing 5 so as to project downward and inward. .

A fixed casing 9 is concentrically inserted and arranged in the rotary casing 5. The upper end of the fixed casing 9 is connected to the funnel-shaped bottom wall 2a of the sand storage tank 2. Reference numeral 10 is a hollow inner rod for sand tamping which is vertically movably inserted into the fixed casing 9 through the sand storage tank 2. The upper end of the inner rod 10 is the top of the machine frame 1. Is connected to the inner rod up-and-down drive means 11 installed in the inner rod 10 and a lower end portion of the inner rod 10 is provided with an electric vibroflot 12 for sand compaction. The inner rod 10
A protective tube 15 for protecting the inner tube 10 in the tank 2 is fitted on the outer surface of the protective tube 15. Although not shown, an electric wire for supplying electric power to the electric motor of the vibro flot 12 is inserted into the inside of the inner rod 10 and extends outside from a required portion above the inner rod 10.

As is apparent from FIG. 2, the sand storage tank 2 is interposed between the inner peripheral surface of the tank 2 and the outer peripheral surface of the protection pipe 15 so as to vertically divide the inside of the tank 2 into two parts. The left and right two tank parts 13 and 14 are provided by the partition wall 16 provided.
It is divided into sections. The tank parts 13 and 14 are connected to the sand supply hoppers 3 and 4 through the sand input ports 17 opened in the upper wall part 2b of the tank 2, respectively, and the sand input ports 17 are opened and closed. A valve 18 is pivotally mounted, and the opening / closing valve 18 is driven to open / close by an air cylinder 19 as an opening / closing drive means. An air nozzle 20 serving as a pressure air supply unit is provided at an upper portion of each tank portion 13 and 14.
And the weight 21 of the weight type sand surface detector.
Are hung down via a string 22.

The pair of rotation driving means 6 and 6 are arranged symmetrically on both sides of the upper end of the rotary casing 5 and are fixed to the output shaft 24 of the electric motor 23 in each rotation driving means 6. The gear 25 meshes with a large gear 26 fixed to the outer peripheral surface of the upper end portion of the rotary casing 5, and the two motors 23, 23 rotate in the same direction, whereby the rotary casing 5 rotates via the gears 25, 26. Driven.

The inner rod up-and-down driving means 11 is composed of a pair of well-known air spring devices 27, 27. The upper half part of each air spring device 27 is a lowering air spring 27a and the lower half part is an upper part. The upper end of the inner rod 10 is connected to a movable frame 28 provided between the air springs 27a and 27b, and the movable frame 28 is slidable on a pair of guide columns 29, 29 on both sides. The compressed air from the air compressor is alternately supplied to the lower moving air springs 27a and the upper moving air springs 27b, whereby the air springs 27a and 27b expand and contract alternately. The inner rod 10 moves up and down with a predetermined stroke.

The rotating casing 5 and the fixed casing 9
The space between the upper and lower space portions 31a, 31 is fixed to the fixed casing 9 side by a plurality of ring-shaped partition members 30 slidably contacting the inner peripheral surface of the rotating casing 5.
A plurality of air supply pipes 32, which are partitioned and formed in b, are pierced into the respective space portions 31a and 31b along the inner peripheral surface of the fixed casing 9. The pressure air introduced into the pipe 32 causes each space 31
a and 31b.

Next, a method of using the sand pile forming apparatus having the above-described structure will be described. First, the apparatus drive frame 1 is suspended from the top of the leader at an appropriate height, and the rotation driving means 6 is used.
Is operated to rotate the rotary casing 5, and while excavating with the excavating blade 8 at the tip, the rotary casing 5 is penetrated into the ground while feeding the wire for raising and lowering operation of the machine frame 1. When the casing penetrates, the opening / closing valve 18 on the side of one of the tank portions 13 and 14 is provided.
Is opened, while the open / close valve 18 on the tank 14 side is closed.

When the rotary casing 5 reaches a predetermined depth in the ground, the rotation of the rotary casing 5 by the rotary drive means 6 is stopped. Of the pair of bucket conveyors (not shown) that move up and down along both side surfaces of the leader, the bucket conveyor on one side is operated to supply sand to the sand supply hopper 3 on the corresponding side. Start. The sand supplied to the hopper 3 is thrown into one tank portion 13 communicating with the hopper 3 and filled in the fixed casing 9.

The sand is filled in the fixed casing 9 and is further accumulated in the tank portion 13 so that the sand surface is the tank portion 1.
When it reaches a predetermined level in 3, the weight 21 of the weight type sand surface detector detects it, and by this detection signal, the operation of the bucket conveyor on the one side is stopped,
Further, the opening / closing valve 18 on the side of the tank portion 13 is closed as shown by the phantom line in FIG. 1, and the supply of pressurized air from the air supply nozzle 19 on the side of the tank portion 13 is started. Then, the inner rod up-and-down driving means 11 and the vibro flot 1
2 is operated to vertically move and vibrate the inner rod 10, while the wire for raising and lowering operation is wound up and the rotary casing 5 is pulled out, so that the sand in the fixed casing 9 is moved upward in the tank portion 13. While being pressed from above by the pressure air supplied to the space portion and being compacted by the tamping action and vibration action of the inner rod 10, it is pushed out from the lower end of the fixed casing 9,
Gradually form sand piles in the ground.

As the sand is extruded from the lower end of the fixed casing 9 to form sand piles in the ground as described above, when the sand surface in the one tank portion 13 falls below a predetermined level, the sand surface is lowered. The dead weight 21 of the dead weight type sand surface detector detects, and the detection signal causes the on-off valve 18 on the other tank portion 14 side to open, and the pressure from the air supply nozzle 19 on the other tank portion 14 side. While supplying air is started, the bucket conveyor on the other side, that is, the side closer to the sand supply hopper 4, is operated, and the sand from this bucket conveyor is supplied into the tank portion 14 through the sand supply hopper 4. At this time, the one tank portion 13 is provided in the fixed casing 9.
Since sand is continuously pressure-filled from
The sand from No. 4 is stopped at the inlet of the fixed casing 9.

If the sand in the one tank portion 13 becomes empty while the sand is supplied into the other tank portion 14, the fixed casing 9 is continuously filled with the sand from the other tank portion 14. To be done. Then, this tank part 14
When the inner sand surface reaches a predetermined level, the weight 21 of the weight type sand surface detector on the side of the tank portion 14 detects this, and the detection signal causes the operation of the bucket conveyor on the other side to stop. In addition, the opening / closing valve 18 on the side of the tank portion 14 is closed, and the supply of pressurized air from the air supply nozzle 20 on the side of the tank portion 14 is started. As a result, the sand in the fixed casing 9 is pressed from above by the pressure air supplied to the upper space portion in the tank portion 14, and the sand piled in the sand pile formed by the sand from the one tank portion 13 continues. Form a stake.

After that, the same operation as described above is repeated to form one sand pile. Normally, sand is supplied to the tank portions 13 and 14 on both sides once, respectively.
The above operation may be repeated twice or more in the case of forming a sand pile, or in the case of a relatively long sand pile.

When the rotary casing 5 penetrates in the above-described sand pile forming process, a plurality of upper and lower space portions 3 formed between the rotary casing 5 and the fixed casing 9 are formed.
Pressure air is supplied to each of the spaces 1a and 31b through the air supply pipe 32, and the pressure air in each of the spaces 31a and 31b is
The excavated soil is sprayed from the through holes 7 of the rotary casing 5 to the surrounding wall surface of the hole to press the excavated soil against the wall surface of the hole, thereby strengthening the wall surface of the hole and preventing the wall surface from collapsing. Further, the large number of through holes 7 provided in the rotary casing 5 have an action of reducing frictional resistance due to a strong earth pressure that the casing 5 receives from the surrounding ground when the rotary casing 5 penetrates, and therefore the penetration operation is facilitated. Become.

[0019]

In the sand pile forming apparatus of the present invention, after the rotary casing is completely penetrated into the ground, when the sand is supplied into the fixed casing, first, one tank is supplied from the sand supply hopper. The sand is supplied to the fixed casing through this section, and when a predetermined amount of sand is stored in this one tank section, the withdrawal of the rotary casing is started and the on-off valve on the one tank section side is closed to Pressure air is supplied by the air supply means, and the air pressure presses the sand in the one tank portion and pushes it out from the lower end of the fixed casing to form sand piles in the ground.

As the sand is extruded from the lower end of the fixed casing to form sand piles in the ground as described above, when the amount of sand in the one tank portion begins to decrease, the other tank portion The on-off valve is opened, pressure air is supplied by the pressure supply means on the side of the tank, and sand is supplied into the other tank through the sand supply hopper. At this time, since sand is continuously pressurized and supplied from the one tank portion into the fixed casing, the sand from the other tank portion is stopped at the inlet portion of the fixed casing.

If the sand in the one tank portion becomes empty while the sand is supplied into the other tank portion, the sand from the other tank portion is continuously supplied into the fixed casing. Then, when a predetermined amount of sand is stored in the other tank portion, the on-off valve on the other tank portion side is closed, and pressure air is supplied by the pressure supply means on the other tank portion side, thereby fixing it. The sand in the casing is pressed from above by the pressure air supplied to the upper space in the tank to form a continuous sand pile with the sand pile formed by the sand from the one tank. After that, the same operation is repeated to construct one sand pile in the ground.

As described above, according to the sand pile forming apparatus of the present invention, a pair of tank portions on both sides, which are constructed by dividing a large capacity sand storage tank into two parts, are alternately used. There is an effect that the work of supplying sand into the fixed casing necessary for forming the pile can be continuously performed without interruption, and thus the sand pile creating work efficiency can be significantly improved.

Further, according to the sand pile forming apparatus of the present invention, the inner rod for sand tamping having the upper end portion interlockingly connected to the vertical drive means is inserted into the fixed casing through the sand storage tank. Thereby, a strong sand pile can be formed.

When a large number of through holes are formed in the rotary casing and pressure air is supplied to the space between the rotary casing and the fixed casing, the pressure in the space is reduced. Air is jetted from each through hole to adhere the excavated soil to the wall surface of the hole, thereby strengthening the wall surface of the hole and preventing the wall surface from collapsing. Furthermore, the internal pressure of each space can be effectively increased by partitioning the space into upper and lower spaces.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a sand pile forming device according to the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

[Explanation of symbols]

 2 Sand storage tank 3 Sand supply hopper 4 Sand supply hopper 5 Rotating casing 6 Rotation drive means 7 Through hole 9 Fixed casing 10 Inner rod for sand tamping 11 Inner rod up-and-down drive means 13 Tank portion 14 Tank portion 16 Partition wall 18 Open / close valve 19 Air Cylinder (Opening / Closing Drive Means) 20 Air Supply Nozzle (Pressure Air Supply Means) 31a Space Part 31b Space Part

Claims (4)

[Claims] 1. A rotary casing which is driven by a rotary drive means, and a fixed casing which is inserted into the rotary casing and has an upper end communicating with and connected to a large-capacity sand storage tank, wherein the sand storage tank is a partition wall. Are divided into left and right tank parts, and the upper end of each tank part is connected to the sand supply hopper through the opening / closing valve driven by the opening / closing drive means. Sand pile forming device provided with air supply means. 2. An inner rod for sand tamping, the upper end portion of which is interlockingly connected to a vertical drive means provided above the sand storage tank, penetrates through the sand storage tank in the fixed casing. The sand pile forming apparatus according to claim 1, which is inserted. 3. The rotary casing is provided with a large number of through holes, and the compressed air is supplied to a space between the rotary casing and the fixed casing. The sand pile building device according to 2. 4. The sand pile forming apparatus according to claim 3, wherein the space portion is divided into upper and lower space portions.