JPS6272811A - Ground improver - Google Patents

Abstract

PURPOSE:To permit the improvement of large-scale ground by a method in which a rod is attached in a sidewardly projective manner to the inside of the stirring blade of a ground improver, a grout flow path is provided in the rod, and a jet nozzle is provided to the tip of the rod. CONSTITUTION:While a rotary shaft 2 penetrated into the ground is pulled up while being turned, a grout is sent under pressure through the shaft 2 to the stirring blade 7. Whereupon, the valve 17 of the blade 7 is pushed down by the grout, and the grout goes through a first path 11 into a back chamber 10 and then pushes a piston 9. A piston rod 14 is projected sidewards, and the grout is jetted through a hole 15 from a jet nozzle 40. A large-scale ground can thus be improved by the length of the grout jetted from the rod 14.

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a ground improvement device used for injecting hardening materials into the ground to improve soft ground during civil engineering work, etc. be.

2. Description of the Related Art Conventionally, this type of device has one type of equipment (not shown), which rotates underground.
A stirring blade is installed on the entering rod.

A hardening material, etc. is injected from the tip of this blade.

In order to improve the working efficiency of such an apparatus, it is necessary to increase the range of improvement per kneading cycle, and it is desired to increase the diameter of the stirring blade.

Problems to be Solved by the Invention However, when the stirring blades are enlarged as described above, the resistance to penetration of the stirring blades increases, and the driving device for drilling must be enlarged.

As a countermeasure, when drilling a hole, the diameter of the stirring blade is made small, the stirring blade is penetrated to a predetermined depth, and then the stirring blade is enlarged, and while the injection material is injected from the tip of the stirring blade, the stirring blade is pulled up and the ground is ground. Specific means for making improvements have been proposed.

However, either means is unreliable in its operation and requires a separate drive to expand the stirring blades. In addition, the operation of returning the enlarged stirring blade to its original position has the disadvantage that it must be done manually on the ground.

This invention was made to solve the above problems, and its purpose is to ensure reliable operation, to be able to expand the stirring type using injection material, and to be able to return the stirring blades to their original positions underground. Moreover, the operation can be performed without manual operation. The purpose is to provide soil improvement equipment.

Means for Solving the Problem This invention will be described with reference to the drawings showing the embodiments.
1 and 2, the rod 2 having the injection material passage l is moved in the axis IM direction Kll! 1 movement freely K and # in the axial direction
A freely movable injection machine 3; a pumping device 4 for pumping the injection material into the passage 1; a pumping device 4 attached to the sea part of the rod 2;

a stirring blade 7 having a main passage 5 through which the injection material passes; an actuating piston device 8 provided in the stirring blade 7; a rear chamber 10 of the cylinder 9a of the actuating piston device 8 and the main passage 5;
A first passage 11 communicating with the front chamber of the cylinder 9a]
2 and the main passage 5; a through hole 15 that passes through the piston 9 and the piston rod 14 in the axial direction; a hole 16 that communicates the front chamber 12 with the outside of the cylinder 9a; This ground improvement device is characterized by comprising a valve 17 provided between a raw passage 5 and a first passage 11.

Function When performing soil improvement using this device, first, while rotating the rod 2 with the injector 3, the stirring blade 7 is inserted into the ground.
C rotation, enter. Then, the injection material is fed into the spear 2 passage 13 from the passage 1 of the rod 2, through the main passage 5 of the stirring blade 7, and into the front chamber 12 of the cylinder 9a by the pumping device 4.
From the hole 16 to the outside of the cylinder 9a, the stirring blade 7
released to the outside. During this time, the stirring blade 7 descends while excavating the ground. Note that during this excavation, a digging blade 6 may be installed indirectly or directly on the stirring blade 7, but this digging blade 6 does not necessarily have to be installed, and may be used in the case of extremely soft ground. Even without the digging blade 6, the stirring blade 7 can dig and descend without being rotated.

When the stirring blade 7 reaches a predetermined depth, the stirring blade 7 is pulled upward while being rotated. Then, the valve 17 is opened, and the injection material in the main passage 5 is pumped through the first passage 11 to the rear chamber 10. Then, the rear chamber IO and the front chamber 12 are filled with the injection material, but in that case, the rear chamber IO and the front chamber 12 are filled with the injection material.
Since the pressure receiving area of O is structurally larger than the pressure receiving area of front chamber 12, piston 9 is moved in the direction of arrow A9.

As shown in FIG. 4, a piston rod 14 provided on the piston 9 is made to protrude from the stirring blade 7. Since the through hole 15 communicates with the first passage 11, the injection material is ejected into the ground from the tip of the protruding piston rod 14, and the piston rod 14 is in contact with the stirring IE7.
It is rotated once and pulled upward, and the injection material is injected and stirred over a wide area as shown at D' in Figure 1-3, thereby improving the ground.

Next, when discharging the injection material is to be terminated, the valve 17 is closed. Then, the pressure inside the rear chamber 10 decreases,
When the pressure inside the front chamber 12 relatively increases, it becomes K, so
The piston 9 moves in the direction opposite to the arrow A90 and enters the state shown in Figure IF2.

After reaching this state, the operation of the pressure feeding device 4 is stopped.

When the injection of the injection material is completed in this way, the stirring blade 7
Raise it to the ground and repeat the above action again.

In FIG. 4, 19 is a stirring member provided on the piston rod 14, 6 is a digging blade provided on the stirring member 19,
18 is also a hole. Also, the stirring member 19 and the stirring blade 7
It shows the void formed between.

Further, numeral 25 indicates a packing, 25 indicates a piston pulp, and 26 indicates a differential pulp. The piston valve 6 is provided within the front chamber 12 and is configured to be moved slightly by the piston 9 to open and close the second passage 13.

Next, the piston 9 moves in the direction of the central part A9 by opening the valve 17.
The piston rod 14 is pushed out in the direction of arrow A9 due to the difference in pressure receiving area between the side and the rear chamber 10 side, that is, the pressure received by the cross-sectional area of the piston rod 14. Move like this.

]K The valve 17 is formed as follows, for example. That is, this valve 17 is slidably provided in a cylindrical valve chamber formed in the stirring blade 7 via a spring 21.
The upper surface ρ faces the main passage 5, and one side surface thereof faces the first passage 11, forming a piston shape.

Since this valve 17 is formed as described above,
By increasing the flow rate from the pumping device t4 above the normal flow rate, the pressure of the injection material is increased, thereby pushing the valve 17 down against the spring 21, thereby causing the valve 17 to open. It has become.

When closing the valve 17, the flow rate from the pressure feeding device 4 may be reduced as in the initial state. Note that this delicate state means that the injection material passes from the main passage 5 to the oni passage 13, and then flows into the front chamber 12. This refers to a state in which the liquid is discharged to the outside of the stirring blade 7 through the hole 16.

Next, although the valve 17 is formed in the shape of a piston as described above, this is just an example, and any type of valve such as this external solenoid valve may be used.

In this way, the piston rod 14 can be moved in the directions of arrows F4 and A9 without changing the flow rate from the pumping device 4.

Of course, if a solenoid valve or the like is used, four markers are attached so that it can be operated from the ground.

Next, the digging blade 6 is indirectly provided on the stirring blade 7 as shown in the figure, but it may be directly provided (not shown), or it may not be provided at all as described above. There is no problem (ゝO) Next, let's talk about the differential piston 8.

The above-mentioned shape and width are just examples, and are not limited to these.1 For example, the piston and piston rod are not clearly separated. It may be of a type in which the member is a fixture, and includes such five types.

In addition,? In FIG. 1, s indicates a drive device, and 25 indicates a lifting device.

The effects of the above embodiment are as follows. That is, the pumping device 4 also transfers the injection material to the second passage 13. Front chamber 12. While discharging it sequentially through holes 16, rotate stirring g7 and lower it into the ground. When the predetermined depth is reached, the flow rate of the injection material from the pumping device 4 is increased, its pressure is increased, the spring 21 is depressed, the valve 17 is opened, and the injection material is transferred from the tooth passage 11 to the rear chamber 10. Let it enter. As a result, the piston 9 also pushes out the cylinder 9a as shown in Figure 4, and the stirring member 1 provided therein is also pushed out.
Rotates with 9. In this case, the injection material is discharged from the tip of the piston rod 14. In addition, since the stirring blade 7 is pulled upward in this state, the ground improvement is carried out in a cylindrical shape within a radius D' which is longer than the length D of the stirring blade 7, as shown in Figure 3.

Effects of the Invention With this device configured as described above, one operation can be performed reliably, and the stirring blades can be expanded using the injection material. Further, the operation of returning the enlarged stirring member to its original state can be performed underground.

Also, the work can be done mechanically.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and Fig. 1 is a diagram showing an outline of the soil improvement device, and Fig. 2 is a cross-sectional view of the main parts of the device.
Figure 1-3 is a diagram showing the operating state of the same device, and Figure 4 is a diagram showing the device shown in Figure 2, but in a different state from Figure 2. 1... Passage 2... Rod 3... Injector 4... Pressure feeding device 5... Main passage 7... Stirring blade 8... Differential piston device 9-e piston lO... Rear chamber 11...first passage 12...front chamber 13...second passage 14...piston rod, door 15...through hole 16...hole

Claims (1)

[Claims] An injection device (
3); A pumping device (4) that pumps the injection material into the passageway (1).
); a stirrer blade (7) attached to the end of the rod (2) and having a main passage (5) through which the injected material passes; a differential piston device (8) provided in the stirrer blade (7); ); the rear chamber (1) of the cylinder (9a) of the differential piston device (8);
0) and a first passage (11) communicating with the main passage (5).
); a second passage (13) that communicates the front chamber (12) of the cylinder (9a) with the main passage (5); the piston (
9) and the piston rod (14); a through hole (15) passing through the front chamber (12) and the cylinder (9a) in the axial direction;
); a valve (17) provided between the main passage (5) and the first passage (11);