JPH06136740A - Mixing and stirring device for ground improvement - Google Patents

Abstract

PURPOSE:To well crush excavated soil, and thereby efficiently mix the excavated soil with fixing material around a pit in a ground improvement mixing and stirring device equipped with a stirring blade and suspension blades. CONSTITUTION:An excavating blade 3 and a nozzle 5 injecting water and ground 6 are mounted on the tip end section of a rotating shaft 2, and a stirring blade 7 is fixed on its upper section. Meanwhile, a ring shaped holding fixture 8 is loosely fitted in a place just above or below the stirring blade 7, guiding pieces 9 are projected in both the directions of the diameter of the holding fixture 8, moreover, each suspension blade 11 which is provided slidably in the horizontal direction along the side surface of each guiding piece 9, is additionally provided for each guiding piece 9. Leaf springs 14 are provided in the back face of each suspension blade 11 to energize each suspension blade 11 outward, the tip end section of each suspension blade 11 thereby presses the wall of an excavated hole 4, so that it can be suspended.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground improvement mixing and stirring apparatus, and more particularly, to a ground improvement mixing and stirring apparatus in which a stirring blade and a stop blade are combined to enable efficient stirring and mixing. It is a thing.

[0002]

2. Description of the Related 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. A mixing and agitating device for ground improvement, which is a combination of a conventional stirring blade and a stop blade (co-rotation prevention blade), forcibly restrains the rotation of the stop blade from the ground and the stop blade in the soil. It is known that the length of the excavation hole is larger than the diameter of the excavation diameter, and the rotation of the excavation hole is stopped by cutting the excavation wall from the start to the completion.

[0003]

Among the above, the former stop blade is surely stopped, but if an obstacle is bitten between the stop blade and the excavation blade or the stirring blade, the stop blade is damaged. There are many. Further, since the fixed shaft of the excavating blade and the stopping blade normally has a double structure, twisting is likely to occur when the soil is shredded.

In the latter stop blade, the length of the stop blade must be adjusted according to the situation of the surrounding ground. Furthermore, if the surrounding ground is hard, or if there are boulders or obstacles on the wall surface of the drill hole, the stop blade cannot cut into the wall of the drill hole and impair the smoothness of the drilling speed. Furthermore, when the distance between the stirring blade and the stop blade is fixed, the stop blade may rotate together with the stirring blade when an obstacle bites in the meantime. descend.

Therefore, in a ground improvement mixing and stirring apparatus having a stirring blade and a stop blade, in order to efficiently shred the excavated soil and mix the shredded excavated soil with the pile circumference fixing material. Therefore, a technical problem to be solved arises, and an object of the present invention is to solve the problem.

[0006]

The present invention has been proposed in order to achieve the above object, and is provided with an excavating blade and a nozzle for ejecting ground improvement material at the tip of a rotary shaft, and In a mixing and stirring device configured to stir the excavated excavated soil and the ground improvement material ejected from the nozzle with a stirring blade fixed to the rotating shaft, fixed near the tip of the rotating shaft. A ring-shaped holder is loosely fitted to the rotary shaft in the vicinity of the stirring blade, and a guide piece configured to have a constant distance from the hole wall surface of the excavation hole is projected in both diametrical directions of the holder. Further, the stop blades can be attached to the guide piece so as to be slidable in the horizontal direction, and the stop blades can be stopped by being urged outward by springs to press the hole wall of the excavation hole. The present invention provides a mixing and agitating device for soil improvement.

[0007]

The excavation hole is excavated by the excavation blade provided at the tip of the rotating shaft, and the excavated soil generated by the excavating operation is accompanied by the rotation of the stirring blade fixed to the rotating shaft. Move to rotate. 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 rotates and moves together with the excavated soil. At this time, the stop blade tries to rotate about the rotation axis by the rotational movement of the excavated soil, but the stop blade is urged outward by the spring, and the elastic force of the spring causes the stop blade to rotate. The hole wall of the excavation hole is pressed to restrain the action of the rotation and stop. Thus, the excavated soil that is rotating and moving is shredded between the rotating stirring blade and the stopped stopping blade, and the shredded soil and the ground improvement material are stirred and mixed. It

Further, since the stop blade is formed so as to be slidable in the horizontal direction, the spring is arbitrarily deformed according to the hardness of the hole wall of the drill hole, and the hole wall of the drill hole is effectively provided. Press to stop. Further, even if the obstacle bites, the stop blade moves and escapes, so that the stop blade is not damaged.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIGS. For the sake of convenience of description, a configuration which is conventionally known will be described at the same time. In the figure, 1 is a 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
To form. 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.

Further, stirring blades 7, 7, ... Are fixedly mounted on the rotary shaft 2. Therefore, the stirring blades 7, 7 ... Rotate in the same direction as the rotary shaft 2 and the excavating blade 3 rotate, and serve 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 depending on the geology, the excavating soil can be crushed or efficiently mixed and stirred with the ground improvement material. You cannot expect the effect of doing.

In view of this, in the present invention, a ring-shaped holder 8 is loosely fitted in the vicinity of the tip of the rotary shaft 2 just below or just above the stirring blades 7, 7 ... And the diameter direction of the holder 8 is increased. Guide pieces 9 and 9 are provided so as to project in both directions, and the guide pieces 9 and 9 are provided.
Is formed to have a diameter smaller than the inner diameter of the excavation hole 4, and further, the elongated holes 10 and 10 in the horizontal direction are bored in the guide pieces 9 and 9, and the guide pieces 9 and 9 are horizontally extended along the side surfaces thereof. Sliding stop wings 11, 11 are provided, and the elongated holes 1 are formed in the stop wings 11, 11.
Projecting pieces 12, 12 which are loosely fitted in the holes 0, 10 are provided to be loosely fitted in the elongated holes 10, 10, respectively, and the elongated holes 10, 1
When the protruding pieces 12, 12 slide on the outer side of 0, the tip portions 11a, 11a of the stop blades 11, 11 press the hole wall of the excavation hole 4 so that the stop blades 11, 11 stop. Is formed in.

Further, plate bodies 13 and 13 are fixed to the tip end portions of the stop blades 11 and 11 to increase the contact area, and the plate bodies 13 and 13 are formed in the hole wall of the excavation hole 4. In order to constantly press the stop blades 11 and 11 so that they can be stopped, leaf springs 14 and 14 are provided behind the stop blades 11 and 11. Thus, the lower ends of the leaf springs 14 and 14 are fixed to the guide holder 8, are curved upward and are pressed against the back surface of the stop blades 11 and 11, and the stop blades 11 and 1 are
I am pushing 1 toward the outside.

Since one embodiment of the present invention relates to the apparatus as described above, the soft ground 1 to be improved is successively dug down by the rotation of the excavating blade 3 to form the excavation hole 4. The excavated soil excavated by the excavating blade 3 is the excavating blade 3
Also, the stirring blade 7 is rotated to move. Further, a ground improvement material 6 such as cement milk is ejected from a nozzle 5 attached to the tip of the rotary shaft 2 and rotates and moves together with the excavated soil. At this time, the left and right stop wings 11, 11 try to rotate together with the rotary shaft 2 as the center of rotation by the rotational movement of the excavated soil, but the left and right stop wings 11, 11 are affected by the elastic force of the leaf springs 14, 14. It presses the hole wall of the excavation hole 4 and restrains the action of co-rotating and stops.

In this way, the excavated soil that is rotating and moving between the rotating stirring blades 7, 7 ... And the stopped blades 11, 11 is shredded, and the shredded soil and Ground improvement material 6
And are efficiently mixed with stirring. The present invention is
Various modifications can be made without departing from the spirit of the present invention, and it goes without saying that the present invention covers the modifications.

[0015]

As described in detail in the above one embodiment of the present invention, the stop blade loosely fitted to the rotary shaft is rotated by the rotation of the stirring blade fixed to the rotary shaft. The excavating soil tries to rotate in the same direction, but the stop blades stop by pushing the hole wall of the excavation hole by the elastic force of the spring interposed behind the stop blades. Thus, the excavated soil is shredded between the rotating stirring blades, and the ground improvement material is well mixed and stirred with the shredded excavated soil to form a solid cylindrical improved ground. You can

Further, since the spring is deformed according to the subtle difference in size and hardness of the excavation hole, the excavation and pulling operation can be performed extremely smoothly. Further, even if there is an obstacle in the drilling hole, it does not hinder the above-mentioned operation for advancing and pulling, and even if an obstacle is caught between the stirring blade and the stop blade, the stop is stopped. Since the blade moves toward the center along the side surface of the guide piece and escapes, there is no possibility that the rotary shaft or the drive portion is overloaded or the stirring blade or the stop blade is damaged.

[Brief description of drawings]

FIG. 1 is a plan view of an essential part showing an embodiment of the present invention.

FIG. 2 is a partially cutaway front view of the essential part of the present invention on the ground.

FIG. 3 is a partially cutaway front view of an essential part of the present invention inside an excavation hole.

[Explanation of symbols]

 1 Soft Ground 2 Rotating Axis 3 Drilling Blade 4 Drilling Hole 5 Nozzle 6 Ground Improvement Material 7 Stirring Blade 8 Holding Tool 9 Guide Piece 10 Long Hole 11 Stopping Blade 12 Projection Piece 14 Leaf Spring

Claims (1)

[Claims] 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 the mixing and stirring device configured to stir with the stirring blade, a ring-shaped holder is loosely fitted to the rotation shaft in the vicinity of the stirring blade fixed near the tip of the rotation shaft. A guide piece configured so as to have a constant interval from the hole wall surface of the excavation hole in both diametrical directions, and further, a stop blade is attached to the guide piece so as to be slidable in the horizontal direction, and The ground mixing and stirring apparatus is characterized in that the stop blades are each biased outward by a spring to press the hole wall of the excavation hole and stop.