JPS59141622A - Sand pile former - Google Patents

Abstract

PURPOSE:To raise workability of a sand pile former by a method in which an outer tube having a screw on its periphery, an intermediate tube having a screw on its lower end, and an inner tube having a air hammer on its lower end thrust into the intermediate tube are provided, and a rotary driver is provided in the elevator frame. CONSTITUTION:An elevator frame 1 is provided with an outer tube 3 having a screw 2 over the whole length of its periphery and an intermediate tube 5 having a screw on the lower end of its periphery thrust into the outer tube 3 in a turnably hung down manner. An inner tube 6 is also thrust into the intermediate tube 5 loosely, and an air hammer 7 is attached to the lower end of the inner tube 6. The outer tube 3 is rotationally driven by a driver 8, and the intermediate tube 5 is rotationally driven by a driver 9. A hopper 10 for charging sand is provided in the outer tube 3, a fixing tube 11 of the same diameter as the outer tube 3 is provided between the hopper 10 and the outer tube 3, and a valve 12 is provided at the connection. A pipe 13 for the air hammer is connected to the upper end of the inner tube 6. A consolidated rigid sand pile can thus be formed thereby.

Description

[Detailed description of the invention] (Subject of invention/field of industrial application) INDUSTRIAL APPLICABILITY The present invention is used in the field of improving soft ground.

The present invention relates to an apparatus for constructing sand piles on soft ground, and more particularly to an apparatus for constructing sand piles without vibration or noise.

(Prior art) As a sand pile construction device, an application has already been filed and published by the applicant of the present invention (Japanese Patent Application No. 152,835/1983, etc.)
In this device, an outer tube and an inner tube inserted into the outer tube are forced to vibrate with a vibrator connected to the upper end of the inner tube, and penetrate into the ground until the outer tube reaches a predetermined depth. After sand is introduced into the outer tube from the hopper, the inner tube is vibrated by a vibrator and simultaneously moved up and down with a relatively long stroke by a fluid pressure cylinder for vertically driving the inner tube. This device forms a sand pile by pulling out the outer and inner tubes while tamping the sand. According to this device, the sand in the outer tube is sufficiently tamped to create a strong sand pile. Although it is very effective, it uses a vibrator and vibrates the inner and outer tubes, which causes severe noise and vibration during operation. In addition, the so-called auger-type sand drain driving machine, which has traditionally been used as a device that generates less noise and vibration, inserts an earth auger into the casing and excavates the ground before lowering the casing. When a specified depth is reached, the auger is removed, sand is poured into the casing, and the casing is pulled out to create a sand pile, but the sand is not compacted inside the casing. There are many disadvantages such as the strength of the sand piles that are formed is weak and the construction ability is low.

(Objective of the Invention) The present invention solves the problems of the conventional sand pile construction, which minimizes the generation of noise and vibration during work, and which can form a sufficiently consolidated and strong sand pile. The purpose is to serve the equipment.

(Structure of the Invention) The sand pile construction device of the present invention that achieves the above object has the following features:
An elevator frame that is suspended so as to be able to rise and fall along a league, has an outer tube with a screw threaded on at least the lower end of the outer periphery, and a screw that is inserted into the outer pipe and has a screw threaded on at least the lower end of the outer periphery. The middle pipes are connected to each other so as to be freely rotatable, and an inner pipe whose inside is an air supply path is inserted into the middle pipe, and an air hammer is attached to the lower end of the inner pipe that protrudes from the lower end of the middle pipe. A rotary drive means for rotationally driving the outer tube and the middle tube is provided in the outer tube, and a sand charging hopper for introducing sand into the outer tube is provided in communication with the outer tube. It is made by connecting two supply pipes.

Furthermore, in the sand pile building device of the present invention, a fixed pipe is interposed between the sand charging hopper and the outer pipe, a sand pressing air supply pipe is connected to the fixed pipe, and the fixed pipe and the hopper are connected. An on-off valve is provided in between.

Example Next, one embodiment of the present invention will be described based on the drawings.

Figure 1 shows the overall diagram of the sand pile construction equipment. In this figure, 1 is a leader (
This is an elevator frame that is suspended in a vertically movable manner from a lift frame (not shown), and an outer tube 3 having a screw 2 threaded over the entire length of the outer circumference is attached to the elevator frame 1, and an outer tube 3 is fitted into the outer tube 3 and is inserted into the outer tube at the lower end of the outer circumference. A middle pipe 5 having a screw 4 threaded thereon is connected to the middle pipe 5 so as to be rotatable, and an inner pipe 6 having an air supply passage 6a inside is loosely inserted into the middle pipe 5. An air hammer 7 is attached to the lower end of the inner tube 6 protruding from the lower end of the elevator frame 5, and a drive device 8 for rotationally driving the outer tube 3 and a drive device 9 for rotationally driving the middle tube 5 are provided within the elevator frame. At the same time, a sand charging hopper 10 for charging sand into the outer pipe 3 is provided, and a fixed pipe 11 having the same diameter as the outer pipe 3 is interposed between the umpper 10 and the outer pipe 3. An on-off valve 12 is provided at the connection between the pipe 11 and the humper 10, and an air supply pipe 13 for operating the air hammer is connected to the upper end of the inner pipe 6. A pipe 14 for supplying air for sand pressing into the outer tube 3 through the fixed tube 11 is connected to and arranged in the outer tube 3 .

To explain the above structure in more detail, the outer tube rotation drive device 8 includes an elevator frame 1 as shown in FIGS. 1 and 2.
A large gear 15 is rotatably supported at the bottom of the large gear 1.
5 is connected integrally with the upper end of the outer tube 3, and a pair of electric motors 16.16 with reduction gears are installed on both sides of the fixed tube 11 in the machine frame 1. The small gear 18.18 fixed to the output shaft 17.17 is connected to the large gear 1.
The small gear 18 is formed by meshing the two types of motors 16 and 16 at both sides of the motors 16 and 16 in the same direction.
．． 18 and a large gear 15 to rotate the outer tube 3. Fixed tube 11, upper tube portion 11a and upper tube portion 11
The upper and lower pipe parts 11a and Ilb are divided into upper and lower pipe parts 11a and Ilb.
are disposed coaxially above the outer tube 3, and as shown in FIG.
They are each fixed to the elevator frame 1 with a predetermined spacing between them and the upper end. As shown in FIG. a and the upper tube part 11b in a rotatable state and fixed to the middle tube 5. A pair of electric motors 20 and 20 with reduction gears are provided on both sides of the fixed tube 11, and these electric 41820.20 output shaft 21.2
Change the small gear 22.22 fixed to 1 to the large gear 1 as shown in Figure 3.
9, so that the rotation of the electric motor 20, 20 causes the middle tube 5 to rotate via the small gears 22, 22 and the large gear 19. As is clear from FIG. 3, the large gear 19 has a plurality of fan-shaped openings 19a formed between its central shaft and peripheral teeth, allowing sand and air to flow in the axial direction within the fixed tube 11. It is designed so that it does not interfere with The gap between the lower end of the earthen pipe part i1a and the upper end of the upper pipe part 11b is defined by a seal ring 23 disposed on the upper surface side of the large gear 19 and a seal-cum-bearing 24 disposed on the lower surface side supporting the large gear 19. The middle tube 5 is sealed by a
It is rotatably supported by a support member 25 as shown in FIG. The inner tube 6 has a large diameter head 6bM as shown in FIG.
The upper end of the air supply path 6a of the inner tube 6 is connected to the air supply pipe 13 passing through the clay pipe portion 11a.

This air supply pipe 13 and sand pressing air supply pipe 14 are each connected to an air compressor (not shown).

As shown in FIGS. 6 to 9, the air hammer 7 includes a body 28 having a sliding chamber 27 connected to the lower end of the inner tube 6, and a pressure chamber 29 having the sliding chamber 27 of the body 27. It consists of a piston 30 that reciprocates inside, and a hend plate 31 attached to the tip G of the piston 30. First, pressurized air from the air supply path 6a of the inner tube 6 is passed through the inlet hole 32a of the body 28 to the introduction path 32. Pressurized air is introduced into the annular intermediate chamber 34 from the intermediate chamber 34 through a plurality of communicating passages 33 extending in the axial direction, and the pressurized air from the intermediate chamber 34 is transferred to the sliding chamber 27 and the screw ring 3.
The annular variable volume chamber 354 between the
The pressure chamber 2 is
Enter 9. At this time, the annular variable volume chamber 35 side and the pressure chamber 29 side
Due to the difference G in the pressure receiving area from the side, the piston 30 having a large pressure receiving area is pushed downward with respect to FIG. When this happens, the pressure air in the pressure chamber 29 flows from the communication hole 36 and the outlet side chamber 37 to the body 28.
The body 28 passes through a plurality of discharge passages 38 extending in the axial direction of the body 28.
It is released into the atmosphere from the upper end surface side, thereby reducing the air pressure in the pressure chamber 29, while the piston 30 is pushed upward by the pressure air in the variable volume chamber 35, and the same operation as described above is repeated at high speed. This causes the piston 30 to perform high-speed vertical reciprocating motion, that is, vertical forced vibration. The head plate 31 is attached to the piston 3 with a screw 39.
0 is hinged at the tip.

The on-off valve 12 has a valve port 4 as shown in FIGS. 10 to 12.
0, and a valve body 42 that opens and closes the valve port 40. The valve receiver 41 is fixed to the upper part of the upper pipe portion Lla of the fixed pipe 11, and A packing 43 is attached to the peripheral edge of the lower surface side, and a valve body 42 is arranged on the lower side of the valve receiver 41, so that the hinge member 44 of the valve receiver 41 and the valve body 42 are attached.
A hinge member 46 at one end of a support frame 45 fixed to the lower surface is hinged with a pin 47, so that the valve body 42 can be opened and closed with respect to the valve port 40.
Normally, it is in the open state at the position shown by the dashed line in FIG. The body 42 is pushed upward and held in the closed position to close the valve. Note that instead of closing the valve body 42 using air pressure, a spring member is installed between the lower surface of the valve body 42 and the inner surface of the fixed pipe 11, as shown by the two-dot chain line in FIG. 48 is interposed so that the valve body 42 is normally held in the closed position by the force of the spring, and when sand is introduced from the hopper 10, the weight of the sand resists the force of the spring and opens the valve body 42. You can also.

When operating the sand pile making device having the above-described configuration, first operate only the drive device 8 while the elevator frame 1 of the device is suspended and supported at an appropriate height from the top of a league (not shown). The outer tube 3 with the screw 2 is rotated in the feeding direction of the screw 2, and while the lifting operation wire (not shown) is let out to lower the outer tube 3, the outer tube 3, The middle pipe 5 and the middle pipe 6 with the air hammer 7 are penetrated into the ground.

In addition, before this outer tube 3 penetrates, so-called point sand (sand plug) is put into the lower end of the outer tube 3 (the part where the screw 4 of the middle tube 5 is located), and when drilling the hole, the inside of the outer tube 3 is removed. prevent soil from entering.

After the outer pipe 3 is penetrated into the ground together with the middle pipe 5 and the inner pipe 6 to a predetermined depth as described above, the outer pipe 3 is rotated in the opposite direction to that at the time of penetration, and the drive device 9 is activated. While rotating the inner tube 5 with the screw 4 in the feeding direction of the screw 4, sand is introduced into the outer tube 3 from the hopper 10 through the fixed tube 11, and then the air supply path 6a of the inner tube 6 is fed from the air supply vibrator 13. The air hammer 7 is actuated by supplying pressurized air (l) to the air hammer 7. The sand introduced into the outer tube 3 is compressed by the screw 4 of the middle tube 5 and is pushed out from the lower end of the outer tube 3. It is further tamped by an air hammer 7 that vibrates vertically at the
By gradually raising and lowering the elevator frame 1 via a wire for lifting and lowering the machine frame (not shown), the sand compacted by the screw 4 and compacted by the air hammer 7 is not pushed out from the lower end of the outer tube 3. From there, sand piles are gradually formed. In this case, when one sand pile's worth of sand has been poured into the outer tube 3, pressurized air is supplied into the fixed tube 11 through the air supply pipe 14, and when the sand has finished being poured into the outer tube 3, the on-off valve 12 is closes the valve and seals the inside of the fixed pipe 11.
The air pressure in the internal space from 1 to the outer tube 3 is increased, and the increased air pressure presses the sand in the outer tube 3 to more strongly consolidate it and push it out from the lower end of the outer tube 3. As a result, a strong sand pile that is sufficiently consolidated and compacted will be formed.

In the embodiments described above, the screws were provided along the entire length of the outer tube, but this is the most preferred case, and the screws may also be provided only at the lower end of the outer tube, and the screws in the middle tube are not implemented. In the example, it is provided only at the lower end of the middle tube, but it may be provided from the lower end to the middle or even over the entire length.

Further, in the embodiment, separate devices are provided for driving the outer tube and the middle tube, but the outer tube and the middle tube may be appropriately rotated by a single drive device.

(Effects of the Invention) The sand pile building device of the present invention comprises an outer pipe having a screw threaded on at least the lower end of the outer periphery, and an inner pipe fitted into the outer pipe and having a screw threaded on at least the lower end of the outer periphery. The pipes are connected to each other so as to be freely rotatable, and an inner pipe whose inside is used as an air supply path is inserted into the middle pipe, and an air hammer is attached to the lower end of the inner pipe that protrudes from the lower end of the middle pipe. A rotary drive means for rotationally driving the tube and the middle tube is provided, a sand-throwing popper for pouring sand into the outer tube is provided in communication with the outer tube, and an air supply vibrator for operating the air hammer is provided at the upper end of the inner tube. When forming a sand pile, the sand introduced into the outer tube is compacted by a screw installed in the inner tube, and then is compressed by an air hammer.
Because it is compacted, the sand can be compacted sufficiently to form a strong sand pile, and unlike conventional equipment, it is not equipped with an exciter, and the air hammer itself is attached to the lower end of the inner pipe. Since the machine operates underground, it is possible to minimize noise and vibration during work, allowing pile construction work to be carried out virtually without noise or vibration.

Furthermore, according to the sand pile building device of the present invention, the sand charging hopper is connected to the outer pipe via a fixed pipe supported by the elevator frame, and the sand pressing air supply pipe is connected to this fixed pipe. At the same time, an on-off valve is provided between the fixed pipe and the popper, and when forming the sand pile, pressurized air is introduced into the fixed pipe from the air supply pipe to increase the pressure in the space from the fixed pipe to the outer pipe. Since the sand pile that is being formed is further pressed and pushed out of the outer tube by the pressure, a stronger sand pile that is more strongly consolidated can be formed.

[Brief explanation of drawings]

FIG. 1 is a partial longitudinal cross-sectional view showing an embodiment of the sand pile building apparatus according to the present invention, FIG. 2 is an enlarged cross-sectional view taken along line nn of FIG.
The figure is an enlarged sectional view taken along the line m-nr in Figure 1. Figure 4 is an enlarged sectional view taken along the line IV-IV in Figure 1. Figure 5 is an enlarged sectional view taken along the line V-V in Figure 1. is an enlarged detailed vertical sectional view of the air hammer shown in FIG. 1, FIG. 7 is a sectional view taken along the line ■-■ in FIG. 6, FIG. Figure IX-IX
Fig. 10 is a plan view of the valve receiver of the on-off valve shown in Fig. 1, Fig. 11 is a plan view of the valve body, and Fig. 12 is a longitudinal sectional view showing the installation state of the on-off valve shown in Fig. 1. be. 1... Elevator frame, 2... Screw, 3... Outer pipe, 4... Screw, 5... Middle pipe, 6... Inner pipe,
7...Air hammer, 8...Outer tube rotation drive device, 9.
...Medium tube rotation drive device, 10...Sand charging hopper,
DESCRIPTION OF SYMBOLS 11... Fixed pipe, 12... Open/close valve, 13... Air supply pipe for air hammer operation, 14... Air supply pipe for sand pressing. Applicant Nakatomi Kurimoto Masashi Kurimoto 2nd illustration omitted 3r! J 薊4 Figure 5 Figure 6

Claims (2)

[Claims] (1) An elevator frame that is suspended so as to be able to rise and fall along a league, has an outer tube with a screw threaded on at least the lower end of the outer periphery, and a screw that is fitted into the outer tube and has a screw threaded on at least the lower end of the outer periphery. The middle pipes each having a screw threaded thereon are connected to each other so as to be rotatable, and an inner pipe whose inside serves as an air supply path is inserted into the middle pipe, and an air hammer is attached to the lower end portion of the inner pipe that protrudes from the lower end of the middle pipe. A rotation drive means for rotationally driving the outer tube and the middle tube is provided within the elevator frame, and a sand charging hopper for introducing sand into the outer tube is provided in communication with the outer tube, and an air hammer is provided at the upper end of the inner tube. A sand pile creation device that is connected to a vibrator that supplies operating air. (2) 2 An elevator frame that is suspended along the leader so that it can be raised and lowered is provided with an outer tube having a screw threaded on at least the lower end of the outer periphery, and an outer tube that is fitted into the outer tube and has a screw threaded on at least the lower end of the outer periphery. The middle pipes each having a screw threaded thereon are connected to each other so as to be rotatable, and an inner pipe whose inside serves as an air supply path is inserted into the middle pipe, and an air hammer is attached to the lower end portion of the inner pipe that protrudes from the lower end of the middle pipe. A rotational drive means for rotationally driving the outer tube and the inner tube is provided within the elevator frame, and
A sand charging hopper for charging sand into the outer pipe is connected to the outer pipe via a fixed pipe supported on the elevator frame, and an air supply pipe for sand pressing is connected to this fixed pipe, and the fixed pipe and the hopper are connected to each other. A sand pile creation device that is equipped with an on-off valve between the