JPH0739954Y2 - Stirring and mixing processing device - Google Patents

Description

[Detailed Description of the Invention] << Industrial Application Field >> The present invention is a stirring and mixing treatment which is particularly used for forming a columnar pile by mixing an improved material and in-situ soil or for improving ground strength. Regarding the device.

《Prior art》 For soft ground improvement method, improver such as quick lime and cement milk and soft cohesive soil are stirred and mixed in-situ in the ground, and the chemical bonding action of the improver and cohesive soil is used. Then, a method of forming a strong columnar pile, stabilizing the soil properties and improving the ground strength is known.

In this type of construction method, a stirring / mixing apparatus including a stirring shaft rotated by a drive device, a supply pipe arranged along the stirring shaft, a stirring blade provided on the lower end side of the stirring shaft, and the like. Is used. The improving material is conveyed at a low pressure through a supply pipe and is discharged from a root portion of the stirring blade or the like into a void portion formed by rotation of the stirring blade. The improved material discharged is scattered on the rotation trajectory as the stirring blade rotates,
It is forcibly mixed with in-situ soil.

In such a stirring and mixing treatment apparatus, the degree of mixing of the improvement material and the in-situ soil greatly affects the quality of ground improvement in addition to the selection of the improvement material. For this reason, especially in soft ground such as cohesive soil or beet layer, the soil tends to adhere to the stirring blades or between the stirring blades, and therefore corotation preventing means is provided in the vicinity of the stirring blades to prevent corotation. .

Conventional co-rotation preventing means are described, for example, in Japanese Patent Laid-Open No. 58-54121 and Japanese Patent Laid-Open No. 60-78013, and FIGS. 6 (a) and 6 (b) show essential parts thereof. ing.

The part (a) in the figure consists of a ring-shaped collar b that is loosely fitted to each of the stirring shafts a and a horizontal bar c that connects the collars b. When the stirring shaft a rotates, the collar b moves the stirring blade d.
By the movement of the soil that is agitated by, the soil moves up and down along the agitation axis a to remove the soil adhering to the agitation axis a, and the horizontal bar c moves the agitation blade d or the co-rotation of the soil adhered between the agitation blades d. I try to stop it.

In the same figure (b), a plurality of co-rotation preventing blades h extending inside the frame-shaped both sides (resistance plate e) up to the vicinity of the stirring shaft f and located between the stirring blades g. And has a structure in which the stirring shaft f is inserted through a boss j provided at an intermediate portion of the frame-shaped upper and lower arms i.

<Problems to be solved by the invention> However, these conventional co-rotation preventing means forcibly rotate the stirring blades or the clods of adhered soil between the stirring blades by the horizontal bar c or the co-rotation preventing blades h. It will stop,
It could not be expected to actively promote stirring and mixing. This is because even if the co-rotation prevention blades h are composed of a plurality of sheets, for example, the prevention blades h have the same shape surface and keep the same distance with respect to the stirring blades.
This is because it is difficult to give a dynamic change to the movement direction of the soil whose rotation is stopped.

Further, in the same figure (b), since the co-rotation preventing blades h are provided inside the resistance plates e on both side portions of the frame shape, the function of preventing co-rotation of soil is better than that of the figure (a). Although excellent, there is a problem in that the number of resistance plates e that can be provided for the stirring blade around the coaxial is limited.

As a result of various studies conducted by the present applicant, it was found that by changing the configuration of the conventional horizontal bar, co-rotation preventing blade, etc., co-rotation can be prevented with high efficiency, and stirring and mixing can be greatly promoted. This led to the present invention. That is, an object of the present invention is to provide a stirring and mixing treatment apparatus having an excellent co-rotation preventing function as well as a function of passively promoting stirring and mixing.

<Means for Solving the Problems> In order to achieve the above-mentioned object, the present invention provides a stirring shaft rotated by a drive device, a supply pipe arranged along the stirring shaft, and a lower end portion side of the stirring shaft. In a stirring and mixing treatment apparatus provided with a stirring blade that mixes the in-situ soil and the improving material discharged from the supply pipe, and a co-rotation preventing means that is loosely fitted to the stirring shaft in the vicinity of the stirring blade, The co-rotation preventing means,
It is characterized in that it comprises a plurality of accelerating plates around the mounting portion with respect to the stirring shaft, which divides the mounting portion peripheral portion into substantially equal parts and which are extended to positions where steps are mutually formed.

<< Operation >> According to the above configuration, the rotation of the stirring blades or the soil adhering between the stirring blades during the stirring and mixing process is stopped by the plurality of accelerating plates as in the conventional case.

In this case, in the co-rotation preventing means of the present invention, since the plurality of promotion plates are extended to the positions forming the steps with respect to each other, the adhering soil is restrained while being sequentially subdivided from the closer one of the promotion plates. Moreover, as a result of the relative movement of the restrained soil being likely to occur, the stirring and mixing of the soil and the improving material are greatly promoted as a whole.

Here, the co-rotation preventing means of the present invention can be applied to those equipped with a plurality of stirring shafts in addition to the single shaft.

Examples Examples of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of an essential part showing a stirring and mixing treatment device to which co-rotation preventing means is applied, FIG. 2 (a) is a plan view of the co-rotation preventing means from above, and FIG. It is a figure.

The stirring and mixing treatment apparatus 1 of FIG. 1 includes an excavation means 3 such as a screw provided at the lower end of the stirring shaft 2, a pair of stirring blades 4 fixed around the stirring shaft 2, and a stirring shaft 2. Co-rotation preventing means 5 provided around the shaft and provided between the stirring blades 4 is provided.

The stirring blade 4 is composed of three blades 4a, 4 protruding around the holder.
It is composed of b and 4c, and is fixed to the stirring shaft 2 with a predetermined interval.

The co-rotation preventing means 5 includes a mounting portion 6 that fits on the stirring shaft 2,
It is composed of four accelerating plates 7a, 7b, 7c, 7d protruding from the mounting portion 6.

The mounting portion 6 has a tubular shape with a length L, and is rotatably fitted to the stirring shaft 2 located between the holders of the stirring blades 4.

As shown in FIGS. 2 (a) and 2 (b), the mounting portion 6 is integrally formed with promoting plates 7a, 7b, 7c, 7d at positions that divide the circumference into substantially equal parts. These accelerating plates are slightly longer than the stirring blades 4 (the length of the prevention plate is almost the same as that of the stirring blades 4,
Alternatively, the length may be set shorter than that of the stirring blade 4, and even in such a case, the rotation is blocked by the resistance of the soil, and thus the same function is achieved. ) It is plate-shaped, has a height t set to 4 × t ≧ L, and is integrally provided at a position around the mounting portion 6 where a step is formed therebetween.

That is, the promotion plate 7b is located one step lower than the top promotion plate 7a, the promotion plate 7c is located one step below the promotion plate 7b, and the promotion plate 7d is further located relative to the promotion plate 7c. It is located at the bottom of the first stage and is the lowest stage.

Further, ribs 8a, 8b having a substantially right triangle shape are provided between the promoting plates 7a, 7b, 7c, 7d on both sides of the base portion between the facilitating plates 7a, 7b, 7c, 7d to strengthen the degree of coupling to the mounting portion 6.

3 (a) and 3 (b) schematically show an example of use of the stirring and mixing device and the action of the co-rotation preventing means, which will be described below with reference to FIG.

First, as shown in FIG. 9A, the stirring and mixing apparatus 1 is moved and positioned by a crane or the like, and then a stirring operation is performed while rotating the stirring shaft 2. The stirring shaft 2 is rotated by the drive device 9 connected to the upper end portion as in the conventional case, and is penetrated to a predetermined depth by the excavation means 3 provided at the lower end portion. Then, generally, the process of stirring and mixing is carried out in the process of penetration, but in this case, a supply pipe (not shown) arranged along the inside of the stirring shaft 2 is a discharge port (provided at the base of the stirring blade 4). (Not shown), and the improving material is discharged at a predetermined flow rate from the discharge port into the soil in situ stirred by the stirring blade 4. The discharged improving material is scattered on the rotation locus as the stirring blade 4 rotates, and is forcibly mixed with the in-situ soil by stirring. (It should be noted that the stirring and mixing operation may be performed in a process of pulling out the stirring shaft 4 after the stirring shaft 2 is penetrated to a predetermined depth.) FIG. 4 schematically shows the action when large and small soil blocks adhered between the blades 4a, 4b, 4c of 4 or the stirring blades 4 are stopped by the co-rotation preventing means 5. Incidentally, the co-rotation preventing means 5 receives resistance of soil after being penetrated into the soil, and as a result, the stirring shaft 2
Does not rotate due to the rotation of.

The adhering soil on the stirring blade 4 is accelerated by one rotation plate 7a, 7b, 7c, 7
The movement due to co-rotation is stopped at 4 places when hitting d.
In this case, since the facilitating plates 7a, 7b, 7c, 7d are extended to the position where they form a step with each other, the adhering soil is sequentially subdivided into the facilitating plates that are far from the nearest one, and is stopped while being subdivided. To be done. Moreover, since the behavior when the co-rotation is sequentially stopped by the promotion plates 7a, 7b, 7c, 7d is different for each part, relative movement easily occurs between the soils separated from each promotion plate, and As a result, the stirring and mixing of the soil and the improving material can be greatly promoted.

FIG. 4 is a schematic view of a stirring and mixing treatment apparatus shown as a second embodiment of the present invention, and FIG. 5 is a perspective view showing co-rotation preventing means of the apparatus.

In the stirring / mixing device 11 shown in the figure, the stirring shaft 12 has a biaxial structure, and the driving device 19 for rotating the stirring shaft 12 and the supply pipe 20 located between the stirring shafts 12 are shared. The supply pipe 20 may be arranged along the inside of each stirring shaft 12, or the hollow portion of the stirring shaft 12 may be used as a supply pipe.

Further, each stirring shaft 12 has a digging means 13 and a pair of stirring blades 14.
Are provided respectively, and the co-rotation preventing means 15 is incorporated.

The co-rotation preventing means 15 includes two mounting portions 16 fitted to the respective stirring shafts 12, and promotion plates 17a, 17b, 17c, 17 protruding from the respective mounting portions 16.
It consists of d.

Each mounting portion 16 has a position that divides the circumference into substantially equal parts, and
As in the embodiment, the facilitating plates 17a are formed so as to form steps with each other,
17b, 17c and 17d are formed to project. The mounting parts 16 are
It is integrated by connecting the promotion plate 17a and the promotion plate 17c.

In addition, the mounting portions 16a, 17b, 17c, 17d on both sides of the base portion
Reinforcing ribs 18a, 18b having a substantially right triangle shape are provided between and.

With this configuration, the co-rotation preventing means 5, which is the main part of the present invention,
15 can be easily applied to a device including a plurality of stirring shafts 12 and the above-described effects can be obtained.

Further, the present invention is not limited to the stirring shaft, stirring blade, driving device, etc. constituting the stirring / mixing device of this embodiment.

<< Advantages of the Invention >> As described above, according to the stirring and mixing treatment apparatus of the present invention, the co-rotation preventing means is constituted by a plurality of accelerating plates extending at the positions where steps are formed mutually, so that the stirring blades Alternatively, the soil adhering between the stirring blades is subdivided from one of the plurality of facilitating plates in the course of one rotation of the stirring blades while being subdivided in order, and is restrained. Movement is likely to occur.

Therefore, the present invention can positively promote the stirring and mixing of the in-situ soil and the improvement material, as well as the excellent co-rotation prevention function, and thereby the quality of the ground improvement method of this type can be greatly improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a stirring and mixing treatment apparatus shown as a first embodiment of the present invention, FIG. 2 (a) is a plan view showing co-rotation preventing means applied to the apparatus, and FIG. ) Is a side view of the co-rotation preventing means, FIGS. 3 (a) and 3 (b) are schematic diagrams for explaining the usage example of the device and the operation of the co-rotation preventing means, and FIG. 4 is the second embodiment of the present invention. FIG. 5 is a schematic view of a stirring and mixing treatment apparatus shown as an embodiment, FIG. 5 is a perspective view showing co-rotation preventing means applied to the apparatus, and FIGS. 6 (a) and 6 (b) are co-rotation preventing means in the stirring and mixing apparatus. FIG. 6 is a schematic view showing a conventional example of FIG. 1,11 …… Stirring / mixing device 2,12 …… Stirring shaft 4,14 …… Stirring blade 5,15 …… Co-rotation prevention means 6,16 …… Mounting part 7a, 7b, 7c, 7d …… Promoting plate 17a , 17b, 17c, 17d ... Promotion plate

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Koichiro Yamaguchi 1-2-1 Taito, Taito-ku, Tokyo Fudou Giken Co., Ltd. (72) Tatsuya Ito 1-2-1 Taito, Taito-ku, Tokyo Fudou Giken Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A stirring shaft rotated by a drive device, a supply pipe arranged along the stirring shaft, and an improvement material provided on the lower end side of the stirring shaft for discharging in-situ soil and the supply pipe. In a stirring and mixing treatment device provided with a stirring blade for mixing and a co-rotation preventing means which is in the vicinity of the stirring blade and is loosely fitted to the stirring shaft, the co-rotation preventing means is provided around the mounting portion for the stirring shaft. An agitating and mixing treatment apparatus, characterized in that it is composed of a plurality of accelerating plates that extend substantially equidistantly around the attachment portion and extend at positions where steps are formed mutually.