JPS6375215A - Soft ground improver - Google Patents

Abstract

PURPOSE:To permit uniform hardening treatment of soft ground by using a stirring blade with a given inclined angle. CONSTITUTION:Two stirring blades 2 and 2' having an inclined angle to make the turning locus a conical form are attached to near the tip of a rotary shaft 1, thereby permitting the treating performance to be raised and uniform hardening treatment to be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for improving soft soil in a broad sense, including sludge, which is deposited in various rivers, ponds, coasts, or harbours.

The present inventor has previously proposed a number of methods and devices for hardening the soft soil by discharging a hardening agent such as ventment into the stirring portion while stirring the soil. This is a new and improved proposal, especially when descending, only the lower stirring zone of the stirring zone is stirred by the group of stirring blades.

Another unique feature is that during the ascent, the hardening agent, such as vent cement, is supplied only to the upper stirring zone of the stirring zone stirred by the stirring blades, and the hardening process is carried out to the required depth.

Hereinafter, an example of implementing the present invention will be described based on the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a rotary shaft constructed as a hollow shaft I, which is provided with rotational drive and lifting action by a device not shown. Reference numeral 2 denotes a lower stirring blade attached to the tip of the hollow shaft, which is attached at an angle of inclination such that the locus of rotation becomes conical, and its apex points downward. Reference numeral 2' denotes another stirring blade that is installed at a position slightly above the stirring blade, and like the stirring blade described above, it is installed at an angle of inclination such that the rotation locus is conical, but the apex is directed upward. It is provided. Therefore, both of the stirring blades 2 and 2' are formed with nine hollow holes inside, and three through holes are formed in the wall surface as appropriate.
, 3' are provided.

4 is a slide tube provided inside the rotating shaft,
A slit 5.5' is provided in the tube at a position corresponding to the stirring blades 2, 2', and communicates with the hollow portion in each stirring blade. Here, the slits 5 and 5' are bored with a phase difference of 90°, and when the slit 5 and the hollow opening of the lower stirring blade 2 communicate with each other, the upper stirring blade 2' It does not communicate with the slit 5' in the closed state, but communicates with the slit 5' when the slide tube 4 rotates 90 degrees, and at this time, the lower stirring blade 2 is in a closed state.

In operation, a sludge hardening agent such as bent cement is fed into the hollow part A of the rotary shaft 1 using a press-in device (not shown) and is lowered while rotating the rotary shaft. Initially, the slide pipe is in communication with the lower stirring blade 2. The curing agent is ejected from the through holes 3. Then, when the rotating shaft 1 moves upward, the slide tube 4 is rotated 90' to communicate with the upper stirring blade 2', and the curing agent is jetted out from the through hole.

In this example, the stirring blades 2 and 2' are set at an inclination angle such that the rotation locus becomes conical during stirring and mixing work by lifting and lowering operations, and installing them in different directions so that the apex faces the lifting direction is a continuous curing method. This is to make it easier to push in and pull out the stirring blades during processing, and to ensure efficient mixing of the stirring blades. Can be installed with different return angles.

FIG. 2 shows another example, one of which is constructed with a double shaft. That is, 10 is an inner shaft, and 11 is an outer shaft which rotates while maintaining a constant gap t on the outside thereof. Here, the inner shaft is formed to be hollow, and the lower stirring blade 12 is attached to the lower tip, and the stirring blade is also formed with a hollow opening inside, and the two hollow parts are in communication with each other. A through hole 13 is bored at an appropriate location.

14 is an upper stirring blade attached to the lower tip of the outer shaft 1; and 15 is a sealing member provided between the inner shaft 10 and the outer shaft 11 and also serving as a bearing.

In this embodiment, the stirring blades 12 and 14 are installed at an inclination angle such that the rotation locus becomes conical during the stirring and mixing operation by lifting and lowering operations, and the apex of the stirring blades 12 and 14 is installed so that the former faces downward and the latter faces upward. This is no different from the previous example, and the continuous hardening process is performed by discharging sludge hardening agent into the stirring part while digging by the lower stirring blade 12 when descending and by the upper stirring blade 14 when ascending. Eggplant.

At this time, it is free to change the number of rotations and the direction of rotation between descending and ascending. Note that the sludge hardening agent can be directly discharged to the outside from the gap between the inner shaft 10 and the outer shaft 11, but the upper stirring blade 14 may be formed hollow inside and provided with a through hole. By doing so, the two can be communicated with each other so that the upper stirring blade 14 can also discharge the liquid.

Furthermore, the curing agent to be discharged may be different between the two, and the curing process may be performed by mixing them within the sludge layer.

In each of the above embodiments, each stirring blade is shown as a pair of paired stirring blades, but multiple pairs may be provided at appropriate intervals, or auxiliary blades may be attached for the purpose of stirring without discharging the curing agent. You are also free to set it up.

Next, the operation of the device having the above configuration will be explained in detail. When first descending, the hardening agent is sprayed and diffused into the stirring area of the stirring blade that descends in advance and into the adjacent areas, and the hardening agent is completely penetrated into this area and hardened while stirring together with the soft soil. After the treatment is performed, the subsequent stirring blades move towards the stirring center and stir the hardening treatment area while adding a stirring action.

It replenishes the function of further perfecting the degree of mixing of soft soil and hardening agent. In addition, when ascending, the hardening agent is supplied only to the stirring zone of the stirring blade that goes up first, and the hardening process is performed while stirring this area together with the soft soil, and the subsequent stirring blades simply stir the hardened area. In addition, it serves to further perfect the degree of mixing of the soft soil and the hardening agent, just as it did during the descent.

These descending steps and ascending steps may be repeated along the same route, or may be repeated while the base such as a truck or float is not slowly advanced, as will be described later.

The improved ground that has been hardened in this way is hardened to a uniform strength, and the hardening agent is particularly well dispersed into the soft soil. This has an excellent effect in preventing incomplete curing of the bottom layer due to poor relationship, and wasteful work of raising and lowering the stirring blade again just to perform stirring.

In FIGS. 3 and 4, two or more apparatuses configured as described above are arranged as one unit.

A restraining means 20 in which the vicinity of the lower tip of each group is connected by a beam member.
20', and FIG. 3 shows an example of two units, and FIG. 4 shows an example of four units.

21a, 21b, 21c, 21d and 21 in each figure.
'a, 21' b, 2 L' c *+12
Reference numerals 1' and 1'h denote shaft bearings, which are designed to support the rotating shaft 1 or the outer shaft 11 on each side at two positions, upper and lower, and are externally secured by fastening means such as bolts 23. Fixed.

22 a, 22 b, 22 c...1.2
2'a, 22'b, 22'c... are beam members that connect the respective shaft bearings, and as is clear from the first illustrated example, each beam member constitutes a three-dimensional solid frame. are combined like this. In addition, the restraining means can have each shaft bearing part split into a split type so that it can be freely attached and detached from the outside.

Here, arranging a plurality of units as in this embodiment is excellent for improving processing capacity and for performing uniform hardening treatment by appropriately changing the rotation direction between each rotating shaft. In addition, by setting the rotation directions in a constant relationship, rotation can be achieved with a good balance.

Providing a restraint means is also useful for maintaining a constant distance between one rotation axis and preventing twisting, especially when the rotation axis becomes long for deep treatment.

The device of the present invention constructed as described above is disclosed in Japanese Patent Application No. 48-13.
No. 0934 (Japanese Patent Application No. 80670, 1983)
No. 9-117565 (Japanese Unexamined Patent Publication No. 51-43812), a truck with running wheels or a plant ship with a float is built into a frame with forced vertical lifting means using gears, chains, wires, etc. It exerts great power in the continuous hardening treatment of the sludge layer as the bogie or float moves slowly.

[BRIEF DESCRIPTION OF THE DRAWINGS] The attached drawings show an example of implementing the present invention.
The figure is a partially broken perspective view, FIG. 2 is a partially broken perspective view of another example, and FIGS. 3 and 4 are partially broken perspective views of the restraining means. 1...Rotating shaft 2.2'...Stirring blade 3.3'...Through hole 4...Inside slide tube 10.1.1 Shaft 11...Outer shaft 12.14...Stirring blade Figure 3 Figure 4 Procedural amendment (voluntary)

Claims (1)

[Claims] (1) At least two stirring blades near the tip of the rotating shaft with an inclination angle that makes the rotation locus conical are installed in different directions so that their apexes face the lifting direction during stirring and mixing work by lifting and lowering operations. A soft ground improvement device featuring: