JPS62242013A - Mixing and stirring device for soil cement - Google Patents

Abstract

PURPOSE:To completely mix a grout and soil by a method in which a coupling blade and a stirring blade are provided at the lower part of the main shaft of a mixing and stirring device, and when the coupling blade comes into contact with the wall of a pit and is stopped, the stirring blade is turned in the opposite direction of the main shaft. CONSTITUTION:A main shaft 13 is connected through a coupling 11 to the lower end of the fitting shaft 10 of an earth auger, and a coupling blade 22 is attached through a sun gear 16 and an epicyclic gear 17 to the outside of the main shaft 13. A stirring blade 20 is attached to an inscribed gear 18. The shaft 13 is turned, excavation is made by an excavating blade 15, and a grout is injected through a hole 12. Hereupon, the perimeter of the blade 22 comes into contact with the side wall of the pit excavated and the rotation of the blade 22 is stopped. The revolution of the gear 17 is then stopped but its rotation continues and the stirring blade 20 integrated with the gear 18 is turned to the opposite direction of the main shaft 13. Soil and grout can thus be vigorously stirred and completely mixed together.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a soil cement production device that mixes and stirs cement while excavating the soil for stabilizing the soil at civil engineering construction sites. .

Conventional technology In order to increase the bearing capacity and durability of the ground, stabilization treatments for soil include chemical methods such as injecting and infiltrating chemical solutions,
Mix the soil with other materials.

There is a physical method.

One of the latter is soil cement, which is produced by mixing cement with soil, and is used for roadbed stabilization, pile foundations, etc.

As an apparatus for producing soil cement, for example, a third
As shown in Figure 6, the lower part of the drill with three shafts is the drilling part 1 (Fig. 6), the upper part is the stirring part 2 (Fig. 6), and the central main shaft 3 (Fig. 3) penetrates. Attach an earth auger that injects cement milk from the hole to a truck crane, power shovel, etc. (Fig. 6), and inject cement milk 4 while stirring and stirring the ground (Fig. 3) to reach a specified depth. After this, cement milk 4 is injected and stirred while raising the earth auger (Fig. 4), and finally, the core material 5 is placed (Fig. 5).

In addition, as shown in Fig. 7, this type of earth auger has an excavation part 7 integrated with the main shaft 6 at the front part (on the right side of Fig. 7), and a guide close to the diameter of the hole made at the rear. There was also an earth auger in which stirring parts 9 protruding from the main shaft 6 were formed radially with respect to the main shaft axis.

Problems to be Solved by the Invention The former earth auger (Figs. 3 to 6) has a complicated structure, is prone to failure, is not easy to clean and maintain, has a considerable weight, and has a small diameter pile. unsuitable and expensive.

The latter earth auger (Fig. 7) has a compact and lightweight structure, but the excavating part 7 and stirring part 9 rotate in the same direction, making it easy to twist, making the hole easily tilted, and the guide 8 and In many cases, the gap between the stirring part 9 and the excavation part 9 was filled with earth, sand, and cement, which hardened, making stirring difficult and stopping the excavation.

The present invention places particular emphasis on the stirring action, and aims to provide a soil cement mixing and stirring device that is lightweight, compact, and easy to stir, and that can be used for pile foundations, etc., where the penalties and stirring loads cancel each other out and do not cause torsion. It is something to do.

Structure of the invention (a) The earth auger has a main shaft that rotates by being attached to the end of the mounting shaft and has a through hole in the shaft core.

(Middle) On the outer periphery of the front end of the main shaft, multiple digging blades with claws protrude radially from the shaft core and are fixed to the main shaft.

(c) A sun gear is engraved in the center of the main shaft.
A plurality of planetary gears are disposed around the outer periphery of the gear, and an internal gear meshes with the outer circumference of the planetary gear to form a planetary gear mechanism.

(ii) A plurality of stirring blades are arranged radially with respect to the main shaft axis on the outside of the internal gear, and are integral with the internal gear.

(e) A plurality of locking blades are arranged radially with respect to the main shaft axis so as to cover the stirring blade on both the upper and lower sides of the stirring blade, and the blades are integrally formed with the planetary gear. It is rotatably fitted around the main shaft, and its outer periphery is approximately the same diameter as the outer periphery of the excavating blade.

(f) The rear end of the main shaft shall have a plurality of rear stirring blades that are integral with the main shaft and radially radially relative to the main shaft axis.

The soil cement mixing and stirring device of the present invention has the above characteristics.

Details will be explained below with reference to figures of examples.

FIG. 1 is a partially sectional side view, and FIG. 2 is a bottom view of FIG. 1.

A coupling 11 is attached to the tip of the mounting shaft 10 of the earth auger.
(Fig. 1) etc., and rotate it, and the through hole 12 is attached to the shaft center.
On the outer periphery of the front end (lower part in FIG. 1) of the main shaft 13 having
A plurality of (three in the embodiment) digging blades 15 to which claws 14, such as those used in power shovels, etc., are attached are attached to the main shaft 13.
The front end claws 25 are fixed to the main shaft 13 at the front end of the main shaft 13, respectively. The digging blades 15 are sloped to facilitate punishment.

A sun gear 16 is carved in the center of the main shaft 13, and a plurality (usually three) of planetary gears 17 are meshed around the outer periphery of the sun gear 16, and an internal gear 18 meshes with the outer circumference of the sun gear 16. This constitutes a planetary gear mechanism.

The planetary gear 17 is carved integrally with the ring, and is supported by bearings at both ends. A boss 1 is provided on both sides of the internal gear 18.
9 are fitted, and the internal gear 18 is connected by known means such as bolts.
A plurality of stirring blades 20 (three each under -E in the figure) are arranged radially with respect to the main shaft axis, and are integrally formed with the internal gear 18 by a key 21 or the like. There is.

As shown in the longitudinal section of FIG. 1, they are located on both the upper and lower sides of the stirring blade 20, and extend radially from both the upper and lower sides of the stirring blade 20 to the main shaft axis so as to wrap around and cover the stirring blade 20. A plurality of locking blades 22 (in three directions) are disposed, and the blades 22 are integrally formed with the planetary gear 17 and rotatably fitted onto the main shaft 13 by bearings, etc., and the outer periphery is formed by a moat. It has approximately the same diameter as the outer periphery of the cutting blade 15.

In the drawings of the embodiment, the upper and lower locking blades 22 are connected together at the outer periphery to form a rectangular longitudinal section, and the locking blades 22 The blades extend inward from the center with a T-shaped cross section.

At the rear end of the main shaft 13, a plurality of rear agitating blades 23 are provided integrally with the main shaft 13 (in the embodiment, three rear stirring blades 23 are provided in the same phase as the digging blades 15) radially with respect to the main shaft axis. .

Therefore, (A) main shaft 13, digging blade 15 and rear stirring blade 2
3° (B) Planetary gear 17 and locking blade 22°Ω The internal gear 18 and the stirring blade 20° are each integrally formed, and the rotation of the main shaft 13 performs a unique planetary gear mechanism movement.

Function of the Invention Next, the function of the soil cement mixing and stirring device (hereinafter referred to as "device") of the present invention will be explained.

As shown in FIG. 6, as shown in FIG. 1, the upper part of the main shaft 13 is attached to the mounting shaft 10 of the earth auger mounted on a truck crane or the like using a coupling 11, a pin 24, etc., and the device is made to stand upright.

Next, when the mounting shaft 10 is rotated and lowered to start digging a hole in the soil, pressurized cement milk is poured into the soil from the through hole 12 of the main shaft 13.

Since the outer diameter of the digging blade 15 and the outer diameter of the locking blade 22 are approximately the same, and the upper and lower locking blades 22 are connected at the outer periphery as shown in FIG. When the locking blade 22 enters the hole, the locking blade 2 is moved by the resistance of the earth and sand on the side wall of the hole.
2 stops rotating, and the outer periphery of the blade 22 is removed by the digging blade 15.
The locking blade 2 acts as a guide to regulate the direction of excavation.
2 stops rotating, the stirring blade 20 integrated with the internal gear 18
rotates in the opposite direction to the main shaft 13, so the blade 2
Vigorous agitation occurs between the locking blade 2 and the locking blade 22.

In this way, when the soil is excavated and stirred to a predetermined depth, the main shaft 13 is rotated in the opposite direction to further inject and stir cement milk, and the device is lifted out of the soil.

Effects of the Invention Since the device of the present invention performs the above-described operations using a planetary gear mechanism, it produces the following unique effects.

(1) When the outer periphery of the locking blade 22 integrated with the planetary gear 17 stops rotating due to resistance such as earth pressure from the side wall of the excavated hole, the planetary gear stops rotating and only rotates on its axis. Therefore, the internal gear and two stirring blades 20 are connected to the main shaft 1.
3, since it rotates in the opposite direction to the digging blade 15, intense stirring is performed, and the earth and sand and cement milk are smoothly discharged without stagnation in the device, and at the same time, as shown in FIG. The main shaft 6 does not move due to clogging with earth and sand, and the entire device does not twist.
With the addition of the effect of acting as a guide (5), it is possible to excavate in a desired direction.

(2) Even if an abnormal load is applied to the stirring blades 20, etc., the planetary gear 17 revolves and tries to escape from the situation, so that digging and stirring are continued and there is little chance of damage to the entire device.

(3) Since the digging blades 15 and rear stirring blades 23 are integrally fixed to the upper and lower ends of the main shaft 13, the main shaft 13 is less twisted and has good mechanical balance.

[Brief explanation of drawings]

FIG. 1 is a partially sectional side view of one embodiment of the device of the present invention;
FIG. 2 is a bottom view of FIG. 1, FIGS. 3 to 5 are explanatory diagrams of the operation of the two sides of the conventional device, FIG. 6 is a side view similarly showing the installed state, and FIG. FIG. 3 is a side view showing the other side of the conventional device. In the figure, numeral 10...mounting shaft, 11...coupling. 12...Through hole, 13...Main shaft, 14...Claw. 15... Punishment feather, 16... Sun gear. 17... Planetary gear, 18... Internal gear. 19... Boss, 20... Stirring blade, 21... Key. 22... Locking blade, 23... Rear stirring blade.

Claims (1)

[Scope of Claims] The earth auger has a main shaft that rotates by being attached to the end of the mounting shaft and has a through hole in the shaft core. On the outer periphery of the front end of the main shaft, a plurality of digging blades with claws protrude radially from the shaft core and are fixed to the main shaft. A sun gear is carved in the center of the main shaft, and a plurality of planetary gears are fitted around the outer periphery of the sun gear, and an internal gear meshes with the outside of the sun gear to form a planetary gear mechanism. On the outside of the internal gear, a plurality of stirring blades are arranged radially with respect to the main shaft axis and are integral with the internal gear. A plurality of locking blades are arranged radially with respect to the main shaft axis so as to cover the stirring blade on both the upper and lower sides of the stirring blade. It is rotatably fitted onto the outside, and the outer periphery must be approximately the same diameter as the outer periphery of the digging blade. At the rear end of the main shaft, there shall be a plurality of rear stirring blades that are integral with the main shaft and radially radially relative to the main shaft axis. Soil cement mixing and stirring device with the above features