JP3049865U - Ground improvement equipment - Google Patents

Abstract

(57) [Summary] [Problem] Excavation difficulties and curved propulsion of a stirring rod occur. A boss (5) is rotatably fitted above an excavating wing (2) projecting laterally from a tip of a stirring rod (1), and a vertical guide plate (6) made of a steel plate perpendicular to the boss (5) is attached to the stirring rod (1). The vertical guide plate 6 has a plurality of projections 9 'projecting in the radial direction at the tip of the vertical guide plate 6 on the lateral support pins 8 attached in the direction of the horizontal projection. The rotary impeller 9 is rotatably supported, and this is
The stirrer 11 is installed at a position almost directly above the position where the tip of the stirrer is located, and a stirring blade 11 is protruded laterally from the stirring rod 1 above the vertical guide plate 6.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The idea was to excavate and agitate the soft ground by attaching excavating wings and agitating wings to the rotating shaft, and then inject the slurry-like solidified material into the agitated earth and sand and agitate and mix, thereby solidifying the ground. The present invention relates to a soil improvement device in which soil columns are successively formed adjacently to improve the ground.

[0002]

[Prior art]

 Conventionally, the excavating wing is provided at the tip, and the stirring rod with the stirring wing provided above is rotated.The ground is drilled while solidifying material such as cement milk is injected from the tip, and the excavated soil is mixed and stirred by the stirring wing. A device that improves the soft ground by consolidating it into a column shape is known.

[0003] When the excavated earth and sand is agitated by this conventional apparatus, in the case of clayey ground, the block-shaped earth mass is rotated as it is together with the agitating blade and remains without being refined, and the agitating effect is insufficient. Had the drawback of becoming

For this reason, conventionally, a co-rotation prevention blade having a radial length larger than the drilling diameter is rotatably loosely fitted around the stirring rod on the stirring blade, and this is cut into the drilling ground to stop. A device is also known in which the earth and sand are finely divided and stirred by the blade cutting motion of the stirring blade and the stirring blade.

[0005]

[Problems to be solved by the invention]

 However, the anti-rotation wing of the conventional device stops rotation around the axis due to the earth pressure reaction force of the drilling ground that the tip has cut into, so that in soft ground, the strength of the earth pressure reaction force depends on the soil quality. There was a problem that the bite length at the tip had to be selected according to the soil quality, and the production management became complicated.

In addition, if the tip of the anti-rotating wing is made to bite into the drilling ground to ensure the locking of the co-rotation prevention wing, the resistance in the excavation direction becomes large on the ground having a high N value. In addition to reducing the efficiency, and if there is hard foreign matter such as rocks on the drilling ground and the co-rotation prevention wings are placed on it, difficulty in excavation or bending of the drilling rod may occur, and When the support layer is inclined, the straightness of the excavation rod depends only on its rigidity, and there is a problem that the excavation rod is bent and propelled.

[0007]

[Means for Solving the Problems]

 A boss 5 is rotatably fitted above the excavating wing 2 projecting laterally from the tip of the stirring rod 1, and a vertical guide plate 6 is fitted to the boss 5 in a pair with the left and right with respect to the axis of the stirring rod 1. The vertical impeller 9 is provided with a plurality of projections 7 ′ projecting radially from a lateral support pin 8 attached to the end of the vertical guide plate 6 in the lateral projection direction. The vertical guide plate 6 penetrates into the drilling hole as the drilling wing 2 progresses the drilling, by installing the drilling blade 2 at a position almost directly above the portion where the tip of the drilling wing 2 is located. When the rotary impeller 9 at the tip contacts the drilling ground, the vertical guide plate 6 stops without following the rotation of the stirring rod 1, and the excavating of the stirring rod 1 with the stationary state maintained. Descend.

When the vertical guide plate 6 descends in the borehole, a part of the periphery of the rotary impeller 9 rotates in contact with the drilling ground, and the resistance of the ground does not depend on the geology of the ground. Thus, the vertical guide plate 6 can be smoothly moved down, so that the stirring rod 1 can be accurately positioned in the vertical excavation direction.

When the stirring rod 1 is pulled up while rotating along with the connecting rod after digging to the required depth, the rotary impeller 9 at the tip of the vertical guide plate 6 comes into contact with the drilling ground and rotates as described above. As a result, the earth and sand mixed and stirred with the solidified material by the stirring blades 11 and 11 'are also stirred by the rotary impeller, so that uniform stirring is possible.

[0010]

[Embodiment of the invention]

 The stirring rod 1 constituting the ground improvement device is provided with a digging wing 2 projecting sideways at the tip thereof, a plurality of digging blades 3 at the lower end of the digging wing, and a substantially U-shaped tip at the tip of the stirring rod 1. A digging plate 4 made of a steel plate is attached, and a boss 5 is rotatably fitted above the digging wing 2. A vertical guide plate 6 made of a steel plate perpendicular to the digging plate 4 is attached to the shaft of the stirring rod 1. It protrudes laterally symmetrically.

A female screw hole 7 is provided at the tip of the vertical guide plate 6 in a laterally projecting direction thereof, and a plurality of projections 9 ′ are projected in a radial direction on a lateral support pin 8 screwed into the rotary screw wheel 7. 9 is rotatably and detachably supported.

The rotary impeller 9 is installed at a position almost directly above a portion where the tip of the excavation wing 2 is located. When the ground is excavated by the excavation wing 2, the rotary impeller 9 comes into contact with the peripheral surface of the drilling ground. It has become.

Further, the stirring rod 1 is provided with a solidified material discharge port 10 for discharging a solidified material such as cement milk at a tip end thereof, and a stirring blade 11, 11 above and below the vertical guide plate 6 in two upper and lower stages. 'Are protruded sideways so as to be orthogonal to each other, and are crushed and finely crushed by the excavating wing 2 and are stirred and kneaded with the solidified material.

When the ground improvement work is performed using the stirring device configured as described above, the stirring rod 1 is rotated through the connecting rod connected to the joint 12 at the upper end thereof. The ground is drilled by the leading excavation plate 3 ′ and the excavation wing 2, and the solidified material pumped from the ground through the connection rod and the stirring rod 1 is discharged from the solidified material discharge port 10.

The vertical guide plate 6 follows the rotation of the stirring rod 1 when the vertical guide plate 6 enters the hole and the rotating impeller 9 at the tip of the vertical guide plate 6 contacts the ground of the hole. The stirrer rod 1 goes down while drilling down the stirrer rod 1 while keeping the stationary state.

When the vertical guide plate 6 descends in the drilling hole, a part of the peripheral portion of the rotary impeller 9 (a half circumferential portion corresponding to the front side in the rotation direction of the stirring rod 1) comes into contact with the drilling ground. The projection 7 'is rotated while being cut into the ground, and the vertical guide plate 6 is smoothly lowered without resistance of the ground regardless of the geology of the ground, whereby the stirring rod 1 is accurately moved in the vertical excavation direction. invite.

The earth and sand excavated by the excavation blade 2 is stirred and kneaded by the stirring blades 11 and 11 ′ together with the solidified material discharged continuously, and the large excavated earth mass is brought into close proximity with the stationary vertical guide plate 6. The powder is finely crushed and stirred by the rotating stirring blade 11.

When the stirring rod 1 is lifted while rotating along with the connecting rod after digging to the required depth in this way, the rotating impeller 9 at the tip of the vertical guide plate 6 comes into contact with the drilling ground in the same manner as described above. As it rises while rotating, smooth lifting can be performed without resistance, and the earth and sand mixed and stirred with the solidified material by the stirring blades 11 and 11 'is also stirred by the rotating impeller, so that uniform stirring is achieved. It becomes possible and after excavation, the excavated soil will be consolidated into a columnar shape to form a consolidated soil column in the ground.

Such ground improvement work is sequentially repeated in the vicinity of the adjacent ground to achieve ground improvement by the consolidated soil columns.

[0020]

[Effect of the invention]

 As described above, according to the present invention, as the drilling wing advances, the rotating impeller attached to the tip of the vertical guide plate is brought into contact with the drilling ground, and the vertical guide plate is grounded while rotating. Regardless of the geology, it can be lowered smoothly without the resistance of the ground, and this enables the stirring rod to be guided accurately in the vertical excavation direction.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a ground improvement device of the present invention.

FIG. 2 is a cross-sectional view of the ground improvement device of the present invention.

FIG. 3 is a front view showing an example of the rotary impeller according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 stirrer rod 2 excavator blade 3 excavator blade 4 excavation plate 5 boss 6 vertical guide plate 7 female screw hole 8 support pin 9 rotary impeller 8 stirrer blade 8 ′ stirrer blade 10 solidified material discharge port 11 stirrer rod 11 ′ stirrer rod 12 joint Department

Claims (1)

[Utility model registration claims] 1. A boss is rotatably fitted above a digging wing protruding laterally from a tip end of a stirring rod, and a vertical guide plate made of a steel plate perpendicular to the boss is attached to an axis of the stirring rod. At the end of this vertical guide plate, a rotating impeller with a plurality of radially projecting projections mounted on a lateral support pin attached to the vertical projection plate at the tip of this vertical guide plate is rotatably supported. A ground improvement apparatus comprising: installing the excavator blade at a position substantially immediately above a portion where the tip of the excavator blade is located; and agitating blades protruding laterally from a stirring rod above the vertical guide plate.