JPH0549891A - Clay kneading mixer - Google Patents

Abstract

PURPOSE:To allow the use of the waste soil contg. the viscous soil produced at the time of ground reforming as a part of the raw material for the packing material for ground reforming by providing plural stationary vanes, agitating vanes fixed to the lower side thereof and plural retaining vanes fixed to the upper parts of the stationary vanes. CONSTITUTION:The plural stationary vanes 16 which are freely turnably mounted at its base end to a revolving shaft 12 and is freely attachably and detachably fixed or detained at its front end to the inner periphery of a drum-shaped casing, the plural agitating vanes 15 which are fixed to the revolving shaft 12 in the lower part thereof and the plural retaining vanes 17 which are fixed to the revolving shaft 12 in the upper part of the stationary vanes 16. The co-rotating of the viscous soil charged into the mixer is prevented by the stationary vanes 15 and is universally sheared by the agitating vanes 15 and, therefore, the excavated soil contg. the viscous soil can be kneaded with a solidifying material and water, and the waste soil on a construction site is decreased. In addition, the raw materials, such as viscous soil, which build up at the time of overlapping of both the agitating and stationary vanes are pressed down by the retaining vanes 17 and, therefore, the rapid kneading is executed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clay kneading mixer which is used for ground improvement and which mixes with a solidifying material the clay soil generated during ground excavation and water.

[0002]

2. Description of the Related Art Conventionally, construction is carried out by a deep mixing ground improvement method in which ground is excavated by excavating blades and agitating blades, mixed with a solidifying liquid and agitated to create an improved column. However, the soil discharged during ground improvement needs to be transported to the outside of the site for treatment, but the present situation is that the place where it can be treated is gradually disappearing. In addition, since the soil discharged during ground improvement contains a large amount of soft cohesive soil, it is difficult to dispose of it in landfills.

The grout mixer shown in FIG. 3 has been conventionally used for kneading a solidifying material to be injected for improving the ground and water, and a rotating shaft 2 is hung from a cylindrical casing 1 to rotate the same. A plurality of propeller-shaped rotary blades 2a are attached to the shaft 2, and the rotary shaft 2 includes a motor 3 to a speed reducer 4
Has been rotated through. A discharge port 5 is provided at the lower part of the casing 1 so as to be openable and closable, and after a predetermined amount of a solidifying material, water and other chemicals is kneaded, it is discharged from the discharge port 5 and processed as a batch type.

Therefore, in order to knead the discharged soil generated by the ground improvement with the solidified material such as cement and the discharged soil containing the cohesive soil,
With the grout mixer shown in Fig. 3, the cohesive soil could not be crushed,
Can't knead even after running for a long time. Therefore, it is possible to use a pot-type mixer, a screw-type mixer (ribbon mixer), or a twin-screw forced agitation mixer that has been conventionally used for kneading ready-mixed concrete, and a pan that has been conventionally used for mortar kneading. It is possible to use a type mixer, etc., but all of them have a drawback that viscous soil mixed with viscous soil adheres to the blades and rotates and moves with the blades, so uniform mixing with the solidifying material is not possible. ..

[0005]

However, in order to use the soil discharged during soil improvement as a filling material for soil improvement, the mixer shown in FIG. 3 simply mixes the discharged soil with the solidifying material and water. It is only possible to crush the cohesive soil, which occupies most of the discharged soil. Even when a pot-type mixer, a screw-type mixer, or a twin-screw forced agitation mixer, which has been used for kneading ready-mixed concrete, is used, viscous soil adheres to the rotating blades (blades) and gradually grows. Since it rotates and moves, the cohesive soil is not sufficiently crushed, and the discharged soil, the solidifying material and the water are not sufficiently kneaded.

The present invention has been made in view of the above-mentioned circumstances, and makes it possible to use, as a filling material for ground improvement, soil discharge containing a part of its raw material containing cohesive soil generated during ground improvement. The purpose is to provide a clay kneading mixer.

[0007]

To achieve the above object, the present invention relates to a mixer in which a rotary shaft is erected in a vertical cylindrical casing,

A plurality of fixed blades whose base ends are rotatably mounted on a rotary shaft and whose front ends are detachably fixed or locked to the inner circumference of the drum-shaped casing, and which rotate below the fixed blades. It comprises a plurality of stirring blades fixed to the shaft and a plurality of pressing blades fixed to the rotating shaft above the fixed blade.

Further, a plurality of protrusions and recesses are alternately arranged in the longitudinal direction on the lower part of the fixed blade and the upper part of the stirring blade, and the fixed blade and the protrusion of the stirring blade are alternately arranged when the rotary shaft rotates. It is configured to pass through each recess. Further, the blade surface of the stirring blade is inclined downward with respect to the rotation direction of the rotating shaft, and the blade surface of the pressing blade is inclined upward with respect to the rotation of the rotating shaft.

[0010]

[Function] By installing the fixed blade, the viscous soil adhering to the stirring blade is scraped off and shredded. The stirring blade pushes up the filler material being kneaded to the upper fixed blade to enhance the shredding effect.
The cohesive soil is further sheared by the polymerization of the respective projections and recesses of the fixed blade and the stirring blade. The presser blade pushes down the rise of the filler containing clay when the projections and recesses of the stirring blade and the fixed blade are superposed.

[0011]

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a front view of a clay kneading mixer of the present invention, and FIG. 2 is a perspective view showing a rotary shaft of the clay kneading mixer and blades attached to the rotary shaft.

In the figure, reference numeral 12 is a rotary shaft, and as shown in FIG. 1, a V sheave 20 is attached to the lower end of the shaft and keyed. 21 is a V-sheave on the motor side, which is a reduction gear shaft 1
It is keyed to 4a. The rotary shaft 12 is a motor 1
When 3 rotates, the V sheave 21 of the reduction gear 14 attached thereto rotates via the V belt 22 and thus the rotary shaft 12 rotates. Four fixed blades 16 are rotatably fitted on the rotary shaft 12, and four pressing blades 17 and four stirring blades 15 are fixed to the upper and lower sides thereof, respectively. The tip of the fixed blade 16 has a fixing bolt 18,
18 is detachably fixed to the inner periphery of the pan-shaped casing 11. Instead of fixing the tip of the fixed blade 16 with a fixing bolt, a protruding piece (not shown) may be provided upright on the inner circumference of the casing 11, and the tip of the fixed blade 16 may be engaged with this protruding piece. The pressing blade 17, the fixed blade 16, and the stirring blade 15 may be a plurality of two or more.

The fixed blade 16 is substantially vertical, and a plurality of protrusions 16a ... 16a are provided in the longitudinal direction at the lower portion of the blade, and recesses 16b ... 16b are formed between the protrusions 16a. 16b overlaps with the protrusions 15a ... 15a arranged in the longitudinal direction on the upper part of the stirring blade 15, and the protrusions 15a ... 15 of the stirring blade 15 when the rotating shaft 12 rotates.
16a passes through the recesses 16b ... 16b.
16a of the fixed blade 16 are configured to pass through the concave portions 15b ... 15b of the stirring blade 15. 16b of the fixed blade 16 do not overlap with the projections 15a of the stirring blade 15 and the projections 15a of the fixed blade 16 and the projections 15a of the stirring blade 15.
It may be configured such that a predetermined gap is formed between the ... 15a. Further, the fixed blade 16 and the stirring blade 15 are not provided with the above-mentioned projections, and the lower edge of the fixed blade 16 and the upper edge of the stirring blade 15 are straight lines, and a gap is provided between them so that the respective blades do not collide. You may. The fixed blade 16
May be inclined forward or backward with respect to the rotation direction of the rotating shaft. The blade surface of the pressing blade 17 is inclined upward with respect to the rotation direction of the rotary shaft 12, and the stirring blade 15
The blade surface of is inclined downward with respect to the rotation direction of the rotary shaft 12.

In the viscous soil kneading mixer shown in FIGS. 1 and 2, one set of the pressing blade 17, the fixed blade 16 and the stirring blade 15 is attached to the rotary shaft 12, but two or more sets are attached. Is also good. 23 is a discharge port, and the outlet is a pin 23a
By sliding the fan-shaped shutter 23b around the axis to open and close, the filler material kneaded in the casing 11 can be taken out.

When the motor 13 is started, it is decelerated by the speed reducer 14 to rotate the V sheave 21, and the V sheave 20 rotates via the V belt 22. Therefore, the rotary shaft 12 attached to the V sheave 20 rotates. When the rotating shaft 12 rotates, the stirring blade 15 and the pressing blade 17 fixed to the rotating shaft 12 rotate in the arrow direction. When the raw materials of the filler, for example, a predetermined amount of clay, cement and water are charged from the upper side of the casing 11 shown in FIG. 1 and the motor 13 is started, the pressing blade 17 and the stirring blades located above and below the stationary blade 16 which is stationary. 15
Rotates in the direction of the arrow, the stirring blade 15 pushes up the raw material of the filling material toward the upper fixed blade 16, and the pushed up raw material collides with the stationary fixed blade 16 and is crushed.

When the clay contained in the raw material adheres to the stirring blade 15 and the fixed blade 16 and tries to grow large,
Since each of the protrusions 15a and 16a functions as a crusher, they are crushed, removed, and kneaded again. The filler material kneaded by the stirring blade 15 and the fixed blade 16 is kneaded with the fixed blade 16 while being pushed down by the pressing blade 17.

In the clay kneading mixer of the present invention, as shown in FIG. 1, a rotating shaft 12 is erected on the bottom of a casing 11 and a drive device for rotating the rotating shaft 12 is arranged below the rotating shaft 12. A drive device may be arranged above the casing as in the conventional example shown, and the rotating shaft may be suspended in the casing.

[0018]

According to the present invention described in detail above, the following effects can be obtained. The fixed blades prevent co-rotation of the cohesive soil fed into the mixer, and the stirring blades freely shear the cohesive soil, so that the excavated soil containing the cohesive soil can be mixed with the solidifying material and water and discharged at the construction site. You can reduce the soil. By filling the filler material kneaded with the mixer according to the present invention in the excavation hole, a uniform ground improvement column can be formed.

When both the stirring and fixed blades are polymerized, the raw material such as clay that rises is pressed down by the pressing blades, so that kneading can be performed in a short time.

Even a lump of clay containing some obstacles such as cobblestone and gravel can be crushed and can be mixed with water and a solidifying material.

[Brief description of drawings]

FIG. 1 is a front view of a clay kneading mixer showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a rotary shaft of a clay kneading mixer according to an embodiment of the present invention and a blade attached to the rotary shaft.

FIG. 3 is a front view showing an example of a conventional mixer.

[Explanation of symbols]

 1, 11 Casing 2, 12 Rotating shaft 15 Stirring blade 15a, 16a Protrusion 16 Fixed blade 15b, 16b Recess 17 Push blade

Claims (3)

[Claims] 1. A mixer in which a rotary shaft is erected in a vertical drum-shaped casing, a base end of which is rotatably mounted on the rotary shaft, and a tip of which is removable from the inner periphery of the drum-shaped casing. A plurality of fixed blades fixed or locked to the rotating shaft; a plurality of stirring blades fixed to the rotating shaft below the fixed blade; and a plurality of pressing blades fixed to the rotating shaft above the fixed blade. Naru clay mixing mixer. 2. A plurality of projections and recesses are alternately arranged in the longitudinal direction on the lower part of the fixed blade and the upper part of the stirring blade, respectively, and the fixed blade and the projection of the stirring blade are mutually arranged when the rotating shaft rotates. The clay kneading mixer according to claim 1, wherein the clay kneading mixer is configured to pass through each recess. 3. The stirring blade has a blade surface inclined downward with respect to a rotation direction of the rotating shaft, and the pressing blade has a blade surface inclined upward with respect to rotation of the rotating shaft. The clay kneading mixer according to claim 1 or claim 2.