JP3136397B2 - Discharge port switching device for improver in deep mixing stirrer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for switching a discharge port of a slurry improver in a deep mixing and stirring machine, and more particularly to a hollow tubular stirring and rotating shaft of a deep mixing and stirring device used for a method of improving soft ground. A valve body for switching up and down the discharge port of the improver is provided, so that the improver is automatically switched so that the improver is discharged from the lower discharge port at the lower end when the rotating shaft penetrates and from the upper discharge port when the rotary shaft is withdrawn. The present invention relates to an automatic switching device for upper and lower discharge ports.

[0002]

2. Description of the Related Art A slurry-type improving agent, such as a cement-based binder, water glass, mortar, quicklime, etc., is poured into a soft ground, and these are mixed and stirred by a stirring blade to form a soft ground. The ground improvement method for improving the ground by hardening is well known in the art, and various stirring and mixing devices used in this method have been proposed.

[0003] As a method of discharging the slurry-like improver in these stirring and mixing apparatuses, a discharge port is provided at the lower end of the stirring rotary shaft, and the improver is discharged and stirred and mixed only at the time of penetration drilling. An improving agent discharge port is provided above the lower end and above the stirring blade, and there is a method in which the improving agent is discharged from the lower discharge port when the rotating shaft penetrates, and is discharged from the upper discharge port when drawing out, and mixed and stirred. The method is the mainstream.

Various devices have been proposed for selecting the upper discharge port and the lower discharge port for discharging the slurry-like improver. For example, Japanese Patent Application Laid-Open No. 61-113923 discloses a device which is used as a stirring rotary shaft. A method has been proposed in which a switching valve is provided in the hollow pipe and switching is performed by operating a manual hydraulic jack in the hollow pipe and an automatic hydraulic jack provided on the top of the hollow pipe, but a complicated switching device and manual operation are required. This is extremely troublesome, and there are many problems particularly in the case of a deep-layer mixing stirrer having a depth of 10 to 30 m or more.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and discharges a slurry-like improver with a simple structure on the lower side or the lower side depending on the rotation direction of the stirring rotation shaft at the time of penetration and withdrawal. It is an object of the present invention to provide an improving agent discharge port switching device capable of automatically switching to an upper discharge port.

[0006]

That is, according to the present invention, an improving agent discharge port is provided at the lower end of the stirring rotary shaft having a supply pipe for the slurry-like ground improving material inserted at the shaft center and above the uppermost stirring blade. In the above-mentioned deep mixing stirrer, a cylindrical valve body is horizontally and rotatably supported in the stirring rotation shaft at the above-described upper discharge port position, and the valve body has an upper side of the improving agent by its rotation angle. A communication pipe that directly connects the supply pipe and the lower supply pipe, and a communication hole that communicates the upper supply pipe and the upper discharge port of the rotating shaft are provided, and are located at substantially the same height position as the valve body of the rotating shaft. On the outside, a swivel plate that projects laterally and that can be swiveled in the horizontal direction by the earth pressure due to rotation of the rotating shaft in the soft soil is pivotally supported. The pulley outside the rotating shaft It relates the discharge port switching device modifiers in deep mixing agitator, characterized by comprising configured to drive a predetermined angular rotation of the valve member by Rukoto. Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0007]

1 is an explanatory perspective view showing an embodiment in which a switching device according to the present invention is mounted on a stirring rotary shaft, and FIGS. 2 and 3 are cross-sectional views showing the operation of a switching valve body. FIGS. 4 and 5 are bottom views showing a state in which the swirl plate that rotationally drives the switching valve body is inserted into and pulled out from the stirring rotary shaft.

In the figure, reference numeral 1 denotes a hollow tubular stirring rotary shaft in a deep mixing and stirring apparatus. The rotary shaft 1 has a plurality of radially arranged multi-stages (for example, three upper and lower stages and two stages each) on its lower outer periphery. A stirring blade 3 is mounted on the shaft 1 and a drilling blade (not shown) is provided on the outer periphery of the lower end, and a lower discharge port (not shown) of a slurry-like soil improving agent such as cement slurry is provided at the lower end of the shaft 1. And an upper discharge port 20 for the improver is provided on the side of the rotary shaft 1 above the uppermost stirring blade 3.

Reference numeral 2 denotes an improving agent supply pipe inserted through the inner shaft portion of the stirring rotary shaft 1 and communicates with the lower discharge port or the upper discharge port 20 through a switching valve body 4 to be described later. Is discharged into the surrounding soft ground.

Reference numeral 4 denotes the upper discharge port 20 in the stirring rotation shaft 1.
, A cylindrical discharge port switching valve body that is inserted in the horizontal direction so as to be orthogonal to the improving agent supply pipe 2, and the valve body 4 is rotatably supported in the circumferential direction.

Reference numeral 5 denotes a straight tubular communication pipe which is opened in the center of the valve body 4 in the vertical direction.
When the valve body 4 is rotated and the upper supply pipe 2a coincides with the upper supply pipe 2a, the diameter of the upper supply pipe 2
The improving agent press-fitted from above into a is supplied to the lower discharge port of the lower end of the rotating shaft 1 via the lower supply pipe 2b.

Reference numeral 6 denotes a communication hole formed in one side of the cylindrical valve body 4 at a position orthogonal to the communication pipe 5 and has the same diameter as the improving agent supply pipe 2. The communication hole 6 is provided in the valve body. The inside of the valve 4 communicates with an outlet 6b formed on the upper discharge port 20 side of the rotary shaft 1 through a space 6a formed around the communication pipe 5 and is rotated by rotating the valve body 4 in the circumferential direction. When the hole 6 coincides with the lower end of the upper supply pipe 2a, the improving agent press-fitted into the supply pipe 2a is discharged from the upper discharge port 20 through the outlet 6b, and the supply to the lower supply pipe 2b is shut off. It has a structure.

A pulley 7 is coaxially fixed to the valve rest 4 and is provided on the outer surface of the rotary shaft 1 on the side opposite to the upper discharge port 20.

Reference numeral 8 denotes a swivel plate which is mounted at a position substantially the same as the valve body 4 and near the pulley 7.
Is configured to project outward from the stirring rotation shaft 1 so as to be freely rotatable in the horizontal direction, and the base of the revolving plate 8 is supported by bearings 9, 9 having upper and lower ends projecting from the outer surface of the rotation shaft 1. 10 and rotates horizontally with the support shaft 10 by a predetermined angle.

Reference numeral 11 denotes a pulley-type wire fixing member which is coaxially fixed to the support shaft 10 and rotates together with the turning plate 8. The other end of the pulling wire 12 having one end fixed to the member 11 is connected to the outer peripheral surface of the pulley 7. And the pulley 7 is rotated by the rotation of the member 11. Since the pulley 7 may rotate the valve body 4 by 90 ° in the circumferential direction, for example, the diameter ratio between the pulley 7 and the wire fixing member 11 is 2: 1
In order to set the rotation angle of the fixing member 11 to 180 °, a stopper 1
The horizontal rotation range of the revolving plate 8 is regulated to 180 ° by the stopper 13.

When the stirring rotary shaft 1 is excavated and penetrated into the soft ground, the shaft 1 is rotated (counterclockwise in FIG. 1 and clockwise in FIG. 4). Is wound, and the revolving plate 8 is brought into contact with the stopper 13a on the pulley 7 side, so that the communication pipe 5 in the valve body 4 matches the upper and lower improving agent supply pipes 2a, 2b to form a slurry. The improving agent is connected to the communication pipe 5 and the lower connecting pipe 2
The improver is agitated and mixed with the surrounding soft soil by the agitating blade 3 so as to be discharged from the lower discharge port at the lower end of the rotating shaft 1 via b (see FIGS. 2 and 4).

When the rotating shaft 1 reaches a predetermined depth, the rotating shaft 1 is pulled out while rotating the shaft 1 in the reverse direction (clockwise in FIG. 1 and counterclockwise in FIG. 5 as viewed from below). At this time, the turning plate 8 is horizontally turned toward the stopper 13b on the opposite side of the pulley 7 by the earth pressure, whereby the pulley-type member 11 that rotates integrally with the support shaft 10 of the turning plate 8 turns, The pulley 7 of the valve body 4 is rotated by 90 ° via the wire 12. As a result, the valve body 4 rotates 90 ° in the circumferential direction together with the pulley 7, and the communication hole 6 of the valve body 4 that communicates with the upper discharge port 20 of the rotating shaft 1.
Communicates with the lower end of the upper supply pipe 2a of the improver, and the improver is discharged from the upper discharge port 20 without flowing to the lower supply pipe 2b, and the stirring and mixing is performed again by the stirring blade 3. .

[0018]

According to the present invention, the outlet switching device for the improver according to the present invention is constructed as described above, and is driven by a swivel plate which is swiveled in the horizontal direction by earth pressure according to the rotation direction at the time of penetration and withdrawal of the stirring rotation shaft. Since the valve body was rotated in the circumferential direction, thereby enabling the discharge of the slurry-like improver to be automatically switched to the lower discharge port or the upper discharge port,
It has advantages such as reliable operation, simple structure and easy manufacture.

[Brief description of the drawings]

FIG. 1 is an explanatory perspective view showing one embodiment in which an improving agent discharge port switching device according to the present invention is mounted on a stirring rotation shaft.

FIG. 2 is a cross-sectional view illustrating a state in which a valve body according to the present invention penetrates a stirring rotation shaft.

FIG. 3 is a cross-sectional view showing a state in which a stirring and rotating shaft of the valve body is pulled out in the present invention.

FIG. 4 is a bottom view showing a state of the revolving plate when the stirring rotation shaft penetrates.

FIG. 5 is a bottom view showing a state of the revolving plate when the stirring rotation shaft is pulled out.

[Explanation of symbols]

 1-Rotating shaft 2-Slurry improving agent supply pipe 3-Top stage stirring blade 4-Switching valve body 5-Communication tube 6-Communication hole 7-Pulley 8-Swirl plate 9-Bearing 10-Support shaft 11-Wire Fixing member 12-Wire 13-Stopper 20-Upper discharge port

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-122316 (JP, A) JP-A-57-146819 (JP, A) JP-A-61-113923 (JP, A) JP-A-58-1983 120915 (JP, A) JP 6-39779 (JP, B2) JP 5-62167 (JP, B2) JP 61-16809 (JP, B2) (58) Fields surveyed (Int. Cl. ⁷ , DB name) B01F 15/00-15/06 B01F ⁷ /00-7/32 E02D 3/12

Claims (1)

(57) [Claims] 1. A deep mixing stirrer in which an improving agent discharge port is provided above a lower end of a stirring rotation shaft and an uppermost stirring blade in which a supply pipe of a slurry-like soil improving material is inserted at an axis portion. A cylindrical valve body is horizontally and rotatably supported in the stirring rotation shaft at the discharge port position, and the valve body has an upper supply pipe and a lower supply pipe of the improving agent depending on the rotation angle. A communication pipe for direct communication, and a communication hole for communicating the upper supply pipe with the upper discharge port of the rotating shaft are provided, and the rotating shaft protrudes laterally outside the same height position as the valve body and rotates. A revolving plate capable of revolving in the horizontal direction is pivotally supported by earth pressure due to rotation of the shaft in soft soil, and revolving of the revolving plate turns a pulley on the outer side of the revolving shaft coaxially fixed to the valve body via a wire. Moving the valve body A discharge port switching device for an improving agent in a deep mixing stirrer, which is configured to be driven to rotate at an angle.