JPS5843521B2 - Traveling ground improvement agent mixing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for mixing a ground improvement agent into soft ground such as a reclaimed land, or into ground where sludge or the like has accumulated on the bottom of a lake or the ocean floor.

The purpose is to propose a device that can efficiently mix soil improvement agents into deep ground in a short period of time.

A method of injecting a soil improvement agent deep into soft ground is, for example, by erecting an injection steel pipe with a stirring blade at the tip into the ground, pulling it upwards, and injecting the improvement agent from the tip into the ground through the inside of the injection pipe. There is one that improves the ground that reaches deep layers by press-fitting the soil and mixing it with the soil using a stirring blade at the tip.

In this construction method, the ground area that can be improved by one injection of steel pipe is within the range that can be stirred and mixed by the stirring blade.

For this reason, it is necessary to repeatedly erect and pull out the injected steel pipes and move them to improve the ground in the required area, which requires a large amount of man-hours.

Furthermore, since the improving agent is injected from the deep layer to the shallow layer while moving the injection tube in the vertical direction, there is a drawback that the injection speed is slow and the injection time is long.

The present invention is an apparatus that solves the above problems of injection and mixing of improvers.

This apparatus will be explained below using the apparatus of the illustrated embodiment.

FIGS. 1, 2, and 3 show the structure of this mixing device.

This device is installed longitudinally inside a improver mixing tube 1 of a required length, the cross section of which is approximately O-shaped with two parallel straight sides and two perpendicular sides being semicircular. Two parallel rotating shafts 3 having stirring blades 2 are attached, and as shown in the figure, two vertical openings 4, 4 are provided in opposing parallel side walls in the length direction.

The two rotating shafts 3 are arranged in parallel in a direction orthogonal to the two openings 4, and the stirring blades 2 are installed in multiple stages at predetermined intervals in the length direction of the rotating shaft 3, with each stage arranged in a radial direction. It has four protruding stirring blades 2.

Although the rotation radius of the stirring blades 2 is longer than half the distance between the axes of the two rotating shafts 3, the mounting positions are shifted from each other, so that the stirring blades 2 do not come into contact with each other.

Further, the rotating shaft 3 is provided with four improver injection holes 5 between the mounting positions of the stirring blades 2 at each stage.

This device has the above-mentioned configuration, and the state in which the ground is improved using this device will be explained using the actual case shown in FIG. 4.

This embodiment is to improve the sludge ground 6 below the water surface.
The work boat 7 on the water surface has a leader column 8 and an auxiliary leader 9 that slides up and down in sliding contact with the leader column 8, and a drive device 10 is suspended and fixed to the lower end thereof.

A mixing device 11 is attached to the drive device 10 and protrudes downward.

This mixing device 11 is press-fitted into the sludge ground 6 by lowering the auxiliary leader 9, leaving only the base end, and its tip reaches the required depth of the sludge ground 6.

In this state, the drive device 10 is operated to rotate the two rotating shafts 3 in mutually opposite directions, and at the same time, the improving agent is injected into the mixing tube 1 from the spout 5 via the rotating shaft 3.

Since the stirring blades 2 and 2 rotate in opposite directions, the sludge soil 6 is taken into the mixing pipe 1 through one opening 4, and the stirring blade 2
The mixed sludge ground 6 is stirred by the sludge and mixed with the ejecting improving agent, and is discharged from the other opening 4 to the outside of the mixing pipe 1.

The sludge soil 6 is taken into the mixing pipe 1 through one opening 4 and discharged through the other opening 4, so the reaction force acts in the direction of the intake side opening 4, causing the mixing The device 11 travels together with the work boat 7.

Then, the sludge ground 6 is continuously moved and simultaneously stirred between the deep layer and the shallow layer of the required depth, and the improving agent is mixed and improved.

In addition to the above embodiments, the mixing device 11 of the present invention includes, for example,
As shown in FIG. 5, blades 12, 12 which are long in the longitudinal direction and mesh with each other can be attached to the two rotating shafts 3, 3, and these can be used as stirring blades.

This example is an example of improving the ground below the water surface, but even in the case of exposed soft ground, for example, two strip-shaped flat plates are placed on the ground, and on top of this, a movable platform supporting the mixing device and the driving device is placed. It is possible to carry out continuous improvement of the ground while moving on a platform.

The present invention is as described above, and the mixing device is capable of simultaneously moving through soft ground at a deep level and moving on its own to continuously stir new ground and mix the improving agent to improve the ground.

Compared to the conventional method of moving the injection pipe up and down to improve the shallow layer from the deep layer, and then pulling out the injection pipe and moving it to improve the new ground, it is possible to improve the ground at the same time in the depth direction and continuously in the horizontal direction. Since improved processing can be performed, the construction period and man-hours can be reduced, leading to a significant reduction in costs.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a cross-sectional view of this mixing device, FIGS. 2 and 3 are sectional views taken along A-A and B-B, and FIG. FIG. 5 is an overall side view of the device in a paddle-working state, and a cross-sectional view of a modified example of the mixing device in which the stirring blades are interlocking gears. 1... Mixing tube, 2... Stirring blade, 3...
...Rotation axis, 4...Opening, 5...
・Blowout hole, 6...Sludge ground, 7...
Work boat, 8...Leader prop, 9...
Auxiliary reader, 10... Drive device, 11...
...mixing device, 12...meshing blades.

Claims (1)

[Claims] 1. Two parallel rotary shafts with stirring blades are installed in the lengthwise direction of the mixing pipe in the improving agent mixing pipe of the required length with openings facing each other on the opposing side walls, and the mixing pipe is installed underground. ,
The rotating shafts rotate in opposite directions, take soil into the mixing tube from one opening facing each other, stir this soil and mix it with the soil conditioner supplied into the mixing tube, and transfer this mixed soil to the other side. 1. A traveling type ground improvement agent mixing device, characterized in that the device discharges the soil improvement agent from an opening, travels underground by the reaction force, and is capable of continuously mixing the soil improvement agent.