JPH07317054A - Multiple spindle mixing treater for improving foundation - Google Patents

Abstract

PURPOSE:To obtain a multiple spindle mixing treater used for separation type execution, in which a plurality of foundation improvement columns are separated independently and formed at fixed distances. CONSTITUTION:A plurality of rotary driving sections 12 consisting of one motors 2 and one speed reducers 3 regarding one stirring excavation shafts 1 are mounted in parallel. A second rotary driving section 12' for a hollow shaft composed of one motor 2 and one speed reducer 3 is installed apart from the rotary driving sections 12 of the stirring excavation shafts 1, and the upper end section of the hollow shaft 7 arranged in parallel with approximately the intermediate place of a plurality of the stirring excavation shafts 1 is connected to an output shaft 8'. The lower section of the hollow shaft 7 is borne at approximately the central sections of connecting fittings 9 mutually constraining and holding a plurality of the stirring excavation shafts 1, and a cutter 10 for hollow is set up at the lower end section of the hollow shaft 7 penetrated into the connecting fittings 9. Accordingly, excavation (penetration) speed can be controlled optimally in response to the state of the hardness, etc., of soil respectively, thus efficiently improving a foundation in high quality.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-axial mixing processor used for improving ground by injecting a ground stabilizer (ground hardening material) into in-situ soil excavated from soft ground and stirring and mixing the soil. The present invention relates to a multi-axis mixing processor used for a separation type (non-lap type) construction in which a plurality of ground improvement columns are formed separately with a certain distance.

[0002]

2. Description of the Related Art Conventionally, the distance between a plurality of stirring and excavating shafts is larger than the diameter of each stirring blade attached to each stirring and excavating shaft.
When a so-called separated type ground improvement is to be carried out with a multi-axis mixing processor, the ordinary excavation method makes it impossible for the connecting metal fittings that hold each stirring excavation shaft to be held due to the resistance of the non-excavation soil between the stirring excavation shafts. Is. Therefore, generally, there was no choice but to construct the ground improvement columns one by one with the stirring excavation axis as a single axis. However, uniaxial construction requires a great deal of time and labor costs.

Then, for example, Japanese Patent Laid-Open No. 63-161214.
In the publication, a separate type multi-axis (2
A shaft) mixing processor is disclosed. The processor is equipped with a stirring blade 2 and a drilling cutter 3 as shown in FIG.
The main feature of the present invention is to provide a horizontal synchronizing shaft 5 which also serves as a connecting fitting for restraining and holding the vertical stirring and excavating shafts 1 and 1 of the book. The horizontal synchronizing shaft 5 is horizontally attached to a lower portion between the two stirring and excavating shafts 1 and 1 via bevel gears 4a and 4b. This multi-spindle mixing processor rotates each stirring and excavating shaft 1 so that the bevel gear 4a,
The rotation is transmitted to the horizontal synchronous shaft 5 via 4b, and the excavating blades 6 provided on the horizontal synchronous shaft 5 are rotated to excavate the non-excavated soil portion between the two stirring excavating shafts 1 and 1. Therefore,
The problem of the so-called connecting metal fittings being subject to resistance due to non-excavated soil is solved, and efficient multi-axis separation type improved construction becomes possible.

[0004]

As described above, in the conventional separation type soil improvement mixing processor shown in FIG. 2, the separation type soil improvement in which the stirring blades are not lapped is carried out by using a multi-axis construction. It is possible to shorten the construction time, which is inversely proportional to the number of axes, and save labor and manpower. However, the multi-axis mixing processor described above has a configuration in which the stirring excavation shaft 1 and the horizontal synchronous shaft 5 are rotated by common power for excavation, and therefore both shafts cannot be individually drive-controlled. Therefore, the excavation cutter 3 and the excavation blade 6 cannot be excavated by optimally coping with the conditions such as the hardness of the in-situ soil.

Further, a bevel gear 4a is provided on the stirring excavation shaft 1,
In addition to engaging the bevel gear 4b of the horizontal synchronizing shaft 5 with this,
The gear unit is completely sealed by a watertight casing that allows the stirring and excavating shaft 1 and the horizontal synchronizing shaft 5 to rotate.
Since the structure is very complicated and the assembly is troublesome, so-called maintenance such as maintenance and maintenance of each component is very difficult.

Therefore, an object of the present invention is that the structure is simple and easy to assemble, and that the non-excavated soil portion between the multi-axis stirring excavation shafts can be excavated by the unique drive control, and the feature of the separation type is further provided. It is an object of the present invention to provide a multi-axis mixing processor for ground improvement, which can easily change the pitch between agitating and excavating axes.

[0007]

As a means for solving the above-mentioned problems of the prior art, a multiaxial mixing processor for ground improvement according to the present invention comprises a plurality of agitating blades 5 and excavating cutters 4 attached thereto. A vertical agitation excavation shaft 1 is rotated by an electric motor 2 and propelled downward to excavate soft ground, and at the same time, a ground stabilizer is injected into the in-situ soil to stir and mix to stabilize a multiaxial mixing processor for ground improvement. In the above, a plurality of rotation drive units 12 each including one electric motor 2 and one reduction gear 3 are provided in parallel for one stirring and excavating shaft 1.
The stirring excavation shafts 1 are mounted vertically downward one by one on the two output shafts 8 and the second rotary drive unit 12 'for the hollow shaft composed of one electric motor and one speed reducer is used for the stirring. The upper end of the hollow excavation shaft 7 which is provided independently of the rotary drive unit 12 of the excavation shaft 1 and which is arranged in parallel to the substantially intermediate position of the plurality of stirring excavation shafts 1 has the second rotary drive unit 12 ′. The lower part of the hollow shaft 7 connected to the output shaft 8 ′ is supported by a substantially central portion of a connecting metal fitting 9 for restraining and holding the plurality of stirring and excavating shafts 1 with each other. It is characterized in that a cutter 10 for excavating a non-excavated soil portion is attached to the lower end of the shaft 7.

The present invention is also characterized in that an injection hole 11 for injecting the ground stabilizer into the in-situ soil is provided in the vicinity of the tip of the hollow shaft 7 and the cutter 10 'for extraction.

[0009]

Since the cutter 10 for boring at the lower end of the boring shaft 7 excavates the non-excavating soil portion prior to the connecting metal fitting 9, the connecting metal fitting 9 receives resistance from the non-excavating soil portion between the stirring excavating shafts. The problem goes away. A second rotary drive unit 12 ′ dedicated to the intermediate excavation shaft 7 is rotationally driven by the stirring excavation shaft 1 in a separated structure in which a plurality of rotary drive units 12 are provided in parallel for each stirring excavation shaft 1. Since it is provided independently of the part 12, the stirring excavation shaft 1 and the medium excavation shaft 7 can be individually driven and controlled, and excavation should be performed by optimally coping with the conditions such as hardness and softness of in-situ soil. You can When the lap type ground improvement is performed, the second excavation drive unit 12 ′ and the hollow shaft 7 are used.
Also, the construction can be performed simply by removing the coupling fitting 9 and changing (or replacing) the length of the coupling fitting.

Since the injection hole 11 for injecting the ground stabilizer into the in-situ soil is provided at the tip of the hollow shaft 7, the cutter 10 for hollowing can be formed, for example, by changing the rotating direction at the time of excavation and at the time of extraction. Ground stabilizers can be injected into the excavated area for improvement.

[0011]

EXAMPLE An example of the present invention shown in the drawings will be described below.
FIG. 1 shows the overall structure of the ground improvement device. Agitation excavation shaft 1 connected to output shaft 8 of main rotary drive unit 12
And the hollow shaft 7 connected to the output shaft 8'of the second rotary drive unit 12 'are the main components. In the illustrated example, each rotary drive unit 12 of the biaxial (however, the number is not limited to this, and may be three or more) 1 is provided for each rotary drive unit 12.
The two electric motors 2 and the one speed reducer 3 are combined, one for each stirring and excavating shaft 1, and a total of two motors are separately provided to form a separate type. Similarly, the second rotary drive unit 12 ′ of the hollow shaft 7 is also composed of one electric motor and one speed reducer, and is provided independently of the main rotary drive unit 12.

The stirring and excavating shaft 1 has a lower portion to which a excavating cutter 4 for excavating soft ground is attached, and an upper portion to which a plurality of stirring blades 5 for agitating excavated soil and mixing a stabilizer are horizontally arranged. The tip of the stirring excavation shaft 1 and the stirring blade 5
An injection hole 11 for ejecting the ground stabilization material is provided in the vicinity of. The two stirring and excavating shafts 1 and 1 are arranged vertically downward and parallel to each other, and the upper ends of the shafts are connected to an output shaft 8 of a rotary drive unit 12 and are rotatable by the rotary drive unit 12. . The lower portions of the two stirring and excavating shafts 1 and 1 are mutually restrained by a connecting fitting 9 and are rotatably supported while maintaining a vertical posture with high precision.

The intermediate excavation shaft 7 is the two stirring excavation shafts 1,
It is provided in parallel with the intermediate position of 1. The total length of the intermediate excavation shaft 7 does not reach the excavation cutter 4 attached to the stirring excavation shaft 1, but is set to a length that penetrates the lowest connecting fitting 9, and the two stirring excavation shafts 1 are mutually connected. It is rotatably supported at a substantially central portion of the connection fitting 9 which is restrained and held.
The upper end of the intermediate excavation shaft 7 is connected to the output shaft 8 ′ of the second rotary drive unit 12 ′, and the lower end portion that penetrates the connecting fitting has a cutter 10 for excavating a non-excavation portion (soft ground). It is provided. An injection hole 11 for injecting the ground stabilizer into the in-situ soil is provided in the tip of the hollow shaft 7 and in the vicinity (upper position) of the extraction cutter 10 '. Therefore, it is possible to smoothly excavate and stabilize the non-excavated soil portion by injecting the ground stabilizer.

Therefore, according to this two-axis mixing processor, when the ground improvement by the stirring excavation shafts 1 and 1 is proceeded while applying the propulsive force in the vertical downward direction, the intermediate excavation cutter which is rotated at the same time is excavated. 10 excavates the non-excavated soil portion between the agitation excavation shafts 1 and 1 by controlling the appropriate rotation speed, so that the connecting metal fitting 9 does not receive the resistance of the non-excavated soil portion, and the hard soil of the in-situ soil can be used. It can be optimally dealt with during construction. Therefore, the ground can be improved with high efficiency by the amount of the multi-axis.

[0015]

EFFECTS OF THE INVENTION According to the multi-axial mixing processor for ground improvement according to the present invention, the rotating speeds of the stirring excavating shaft and the medium excavating shaft can be controlled individually, so that the soil excavation shaft can be controlled according to the soil condition such as hardness and softness. The (penetration) speed can be controlled optimally, and the ground can be improved efficiently and with high quality. A plurality of stirring excavation shafts are constrained and held only by connecting metal fittings, and the lap type or non-lap type ground improvement is attached to the connecting metal fittings with the second rotary drive unit to which the intermediate excavation shaft is connected, or the same connection. Since the construction can be performed by changing the state of removing from the metal fittings, the structure is greatly simplified, and therefore the mechanical drab is less and maintenance-free.

[Brief description of drawings]

1A and 1B are an overall view of a ground improvement device and a cross-sectional view taken along the line I-I.

FIG. 2 is a front view showing a main part of a conventional ground improvement device.

[Explanation of symbols]

 5 Stirring blade 4 Excavation cutter 1 Stirring excavation shaft 2 Electric motor 3 Speed reducer 12 Rotation drive unit 8 Output shaft 12 'Second rotation drive unit 7 Medium excavation shaft 8'Output shaft 9 Connecting metal fitting 10 Medium excavation cutter 10' Extraction cutter 11 injection holes

Claims (2)

[Claims] 1. A plurality of vertical stirring and excavating shafts equipped with stirring blades and excavating cutters are rotated by an electric motor and propelled downward to excavate soft ground, and at the same time, ground stabilizers are injected into in-situ soil and mixed by stirring. In a multi-spindle mixing processor for ground improvement that stabilizes and stabilizes, a rotary drive unit consisting of one electric motor and one speed reducer is provided in parallel for each stirring excavation shaft, and the output of the rotary drive unit The stirring and excavating shafts are mounted vertically downward one by one on the shaft, and the second rotary drive unit for the intermediate excavation shaft, which is composed of one electric motor and one reducer, is the rotary drive unit for the stirring and excavating shaft. Is provided independently, the upper end of the hollow shaft placed parallel to the substantially intermediate position of the plurality of stirring drill shafts is connected to the output shaft of the second rotary drive unit, the lower portion of the hollow shaft is A chain for restraining and holding the plurality of stirring excavation shafts. A multi-purpose tool for ground improvement, characterized in that it is supported at approximately the center of the tie, and a cutter for digging the non-excavated soil is attached to the lower end of the digging shaft that penetrates the tie. Axial mixing processor. 2. A ground improvement characterized in that an injection hole for injecting a ground stabilizer into an in-situ soil is provided at a position in the vicinity of the tip end portion of the hollow shaft and the extraction cutter according to claim 1. Multi-axis mixing processor.