JPH0564221U - Mixing and stirring equipment for ground improvement - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a mixing and agitating device for ground improvement, which has a simple structure and can efficiently crush and mix excavated soil. [Structure] An excavating blade 3 and a nozzle 5 for ejecting water and ground improvement material 6 are attached to the tip of a rotary shaft 2, and a stirring blade 7 is fixedly installed on the upper portion thereof. On the other hand, a tubular body 8 is loosely fitted directly above or directly below the stirring blade 7, and a short arm 9 is fixedly mounted on the tubular body 8, and a corotation preventing blade 10 is attached to the tip P of the arm 9. Pivot the center. Thus, the co-rotation preventing wing 1
0 is rotated about the rotary shaft 2 and the tip P of the arm 9 by the rotational movement of the excavated soil, and during rotation, the end of the co-rotation preventing blade comes into contact with the hole wall and is temporarily stopped. Thus, the excavated soil is pulverized between the rotating stirring blades and well mixed and stirred with the ground improvement material.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a ground improvement mixing agitator, and more particularly, to a rotary shaft having a co-rotation preventing blade provided directly above or immediately below the agitating blade, and having the agitating blade fixed to the center of rotation of the co-rotating preventing blade. In addition to the above, the present invention relates to a mixing and stirring device for ground improvement.

[0002]

[Prior Art]

 A mixing and stirring apparatus for ground improvement mechanically mixes excavated soil and a pile circumference fixing liquid, and the mixture is solidified to improve the ground into a cylindrical shape. In particular, it is difficult to stir the clay layer, and in order to do it efficiently, two excavation stirring blades are used. There are known devices that rotate and agitate at different speeds, or devices that use a single excavation and agitation blade to frequently agitate by repeatedly excavating and pulling.

[0003]

[Problems to be solved by the device]

 Among the above-mentioned conventional types, the one using two excavating stirring blades has a complicated structure and causes a cost increase, and the one using a single excavating stirring blade has an extremely small effect of crushing the excavated soil finely. In addition, the working time is long and practically unusable. Therefore, there is a technical problem to be solved in order to efficiently crush and excavate the excavated soil with a simple structure, and the present invention aims to solve the problem. ..

[0004]

[Means for Solving the Problems]

 The present invention was proposed in order to achieve the above-mentioned object, and is provided with an excavating blade and a nozzle for ejecting ground improvement material at the tip of a rotating shaft, and ejects from the excavated soil excavated by the excavating blade and the nozzle. In a mixing and agitating device in which the ground improving material to be agitated is agitated by an agitating blade fixed to the rotary shaft, a cylindrical body is provided above or below the agitating blade fixed to the rotary shaft. Further, the arm is fixed to the cylindrical body, and the co-rotation preventing blade is pivotally attached to the tip of the arm, and the co-rotation preventing blade is provided with the rotating shaft and the rotating shaft due to the rotational movement of the excavated soil. If the end of the anti-rotation blade comes into contact with the hole wall during rotation of the anti-rotation blade, the contact resistance causes the anti-rotation to occur. The rotation of the prevention wing is restricted and is fixed near the co-rotation prevention wing. There is provided a mixing and stirring apparatus for soil improvement being characterized in that to be able to be agitated by comminuted said excavated soil with the 拌翼.

[0005]

[Action]

 Pile holes are excavated by the excavation blades provided at the tip of the rotary shaft, and the excavated soil generated by the excavation operation moves rotationally as the stirring blade fixed to the rotary shaft rotates. It At the same time, a ground improvement material such as cement milk is ejected from a nozzle provided at the tip of the rotary shaft, and is rotationally moved together with the excavated soil to be stirred. At this time, since the co-rotation preventing blade rotates due to the rotational movement of the excavated soil around the rotation axis and the arm tip, the tip end of the co-rotation preventing blade comes into contact with the hole wall of the excavation hole, The co-rotation preventing blade is stopped or is in a semi-stop state. Thus, the excavated soil is shredded between the co-rotation preventing blade and the rotating stirring blade, and the shredded soil and the ground improvement material are stirred and mixed. Therefore, the co-rotation preventive blades stop at any time depending on the viscosity and hardness of the soil in the hole, and by repeatedly stopping and moving without completely stopping, the action of the shredding stirring is efficiently performed. Do it.

[0006]

【Example】

 An embodiment of the present invention will be described below in detail with reference to FIGS. For the sake of explanation, the matters that are conventionally known will be described at the same time. In the figure, 1 is the soft ground to be improved. The soft ground 1 is dug down by the rotation of the excavating blade 3 fixed to the tip of the rotary shaft 2 to form a hole 4. Then, a ground improvement material 6 such as cement milk is ejected from a nozzle 5 provided at the tip of the rotary shaft 2 and injected into the excavated soil excavated by the excavating blade 3.

A stirring blade 7 is fixedly installed on the rotary shaft 2. Therefore, the stirring blade 7 rotates in the same direction as the rotating shaft 2 and the excavating blade 3 rotate, and functions to mix and stir the excavated soil and the ground improvement material 6. However, rotation of the excavating blade 3 and the rotating shaft 2 in the same direction can rotate and move the excavating soil in the same direction, but it is necessary to crush the excavating soil or efficiently mix and stir with the ground improvement material. The effect cannot be expected.

Therefore, in the present invention, as in the embodiment of FIG. 1, a tubular body 8 is loosely fitted directly below or directly above the stirring blade 7, and an arm 9 is attached to the tubular body 8 as a rotary shaft. 2, and the center portion of the co-rotation preventing blade 10 is pivotally attached to the tip P of the arm 9, and the co-rotation preventing blade 10 is rotated by the rotational movement of the excavated soil. The shaft 2 and the tip portion P of the arm 9 rotate about the rotation center, and during the rotation, the tip portion of the co-rotation preventing blade 10 contacts the hole wall 4a, and the contact resistance causes the co-rotation preventing blade 10 to rotate. It is configured such that the rotation can be constrained. Therefore, it is desirable that the length of the arm 9 is generally less than half the hole diameter, and the co-rotation preventing blade 10 can contact the hole wall 4a at least at the end thereof during the rotation of the co-rotation preventing blade 10. It must be the length of. Further, the co-rotation preventing blade 10 is provided immediately above or below the stirring blade 7, but the distance between them must be maintained so that they do not collide with each other. Further, the contact plates 10a, 10a can be attached to the ends of the co-rotation preventing blade 10.

Since one embodiment of the present invention has the above-mentioned configuration, the soft ground 1 to be improved is successively dug down by the rotation of the excavation blade 3 to form the hole 4. Then, the excavated soil excavated by the excavating blade 3 is rotationally moved by the rotation of the excavating blade 3 and the stirring blade 7. Further, a ground improvement material 6 such as cement milk is ejected from a nozzle 5 attached to the tip end of the rotary shaft 2 and is rotationally moved and agitated together with the excavated soil. At this time, since the central portion of the co-rotation preventing blade 10 is pivotally attached to the tip end portion P of the arm 9 and the arm 9 is loosely fitted to the rotating shaft 2, the co-rotation preventing blade 10 is Are rotated in the same direction by the excavated soil that is rotating. Furthermore, when the end of the co-rotation preventing blade 10 contacts the hole wall 4a during the rotation of the co-rotation preventing blade 10, contact resistance is generated between the end wall and the hole wall 4a, and the co-rotation preventing blade 10 is in a half-stop state. .. Moreover, the stirring blade 7 rotates to move the excavated soil in rotation, while the co-rotation preventing blade 10 is temporarily stopped and the excavated soil that is the same as the co-rotation preventing blade 10 is stopped. .. Therefore, the excavated soil is pulverized between the stirring blade 7 and the anti-rotation blade 10, and the ground improvement material 6 and the excavated soil to be comminuted are well agitated and mixed to form the inside of the hole. An improved ground in the form of a cylinder with little variation is created.

It should be noted that the present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified version.

[0011]

[Effect of the device]

 As will be described in detail in the above-mentioned one embodiment of the present invention, the co-rotation prevention blade also rotates around the rotation axis and the tip end portion of the arm rotates due to the excavated soil that is rotated by the rotation of the stirring blade. It will rotate around the center. Therefore, when the co-rotation preventing blade rotates about the tip of the arm as the center of rotation, the end of the co-rotation preventing blade comes into contact with the hole wall, and contact resistance occurs between the end wall and the hole wall. , The co-rotation prevention wing is temporarily stopped. Thus, the excavated soil is crushed between the rotating stirring blades, and the ground improvement material is well mixed and stirred with the crushed excavated soil. Further, since the co-rotation preventing blade does not always stop, but moves slightly in the rotating direction, the variation of the mixing of the ground improvement material in the entire hole is small, and the solid cylindrical shape is strong. You can get improved ground.

Further, since the function of the co-rotation preventing blade is not affected by the hardness of the surrounding soil, it is not necessary to change the length of the co-rotation preventing blade depending on the type of the surrounding soil, and when an obstacle is encountered. In this case, not only does the rotating shaft and the drive unit not be overloaded or damaged, but also the structure is extremely simple and economical, and so on. It is a valuable idea.

[Brief description of drawings]

FIG. 1 is a partially cutaway vertical sectional view of an excavation portion showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

[Explanation of symbols]

 1 Soft Ground 2 Rotational Axis 3 Excavation Blade 4 Hole 4a Hole Wall 5 Nozzle 6 Ground Improvement Material 7 Stirring Blade 8 Cylindrical Body 9 Arm 10 Co-rotation Preventing Blade P Tip of Arm

Claims (1)

[Scope of utility model registration request] 1. An excavating blade and a nozzle for ejecting ground improvement material are provided at the tip of a rotating shaft, and excavated soil excavated by the excavating blade and the ground improving material ejected from the nozzle are fixed to the rotating shaft. In a mixing and stirring device configured to stir with the stirring blade, the cylindrical body is loosely fitted directly above or below the stirring blade fixed to the rotating shaft, and an arm is fixed to the cylindrical body. Then
A co-rotation preventive wing is pivotally attached to the arm tip, and the co-rotation preventive wing is configured to be rotatable about both the rotation shaft and the arm tip by rotational movement of excavated soil, Further, when the end of the co-rotation preventing blade comes into contact with the hole wall during rotation of the co-rotation preventing blade, the rotation of the co-rotation preventing blade is restrained by the contact resistance, and the vicinity of the co-rotation preventing blade exists. A mixing and stirring apparatus for ground improvement, characterized in that the excavated soil can be crushed and stirred between the fixed stirring blades.