JPS5916050B2 - Support structure with stable solidification in soft soil layer - Google Patents

Description

[Detailed Description of the Invention] The present invention continuously stirs colloids, clay, silt, and silt-mixed sand layers (hereinafter referred to as soft soil layers) in rivers, lakes, ports, seas, etc. over a certain length using stirring blades. The present invention relates to a method for continuous hardening treatment by jetting a hardening agent made of special cement into the agitated area, resulting in a stably hardened support structure required for civil engineering.

Conventionally, the stable and solidified support structure required for such civil engineering was
It is difficult to obtain this in a single construction work, and it is necessary to carry out the work in several parts or over several days.

In this case, the support structure will be formed into a support structure with strength problems due to the influence of differences in the progress of solidification of the hardening agent in the range of execution carried out once or in one day. It is.

The present invention aims to solve the problem of slanting,
The support structure of the continuous hardened wall obtained by the method of the present invention has the advantage that maximum engineering strength can be obtained with the minimum necessary amount of stable hardening due to its special shape and special combination of its arrangement. It has the following characteristics.

An example of implementing the method of the present invention will be explained based on the drawings.

Figure 1 shows the basic shape of a support structure that is formed in a soft soil layer in one day or one time.
A hardening treatment device 2, which will be described later, is moved continuously, and stirring blades are raised and lowered to a constant depth and width, and a hardening agent is jetted out at the same time as stirring to form a continuous hardened wall 3.

In this case, l is the construction range to be constructed in one day or once, and the continuous hardened wall 3 is formed into a wavy body having at least one undulation ρ in a plan view, and the undulation is The size and number can be freely designed.

Further, the undulation is not limited to the same undulation, and can be changed as appropriate.

In the above embodiment, the undulation ρ is formed into an m curve, but it may be formed into a C08 inch curve.

Further, it may be formed into a sawtooth shape or a rack tooth shape as shown in FIGS. 2 and 3.

FIG. 4 shows a hardening device 2 for constructing a continuous hardened wall, and in this example, the hardening device 2 is mounted on a float 5.

That is, in the hardening treatment apparatus 2, a rotating shaft 7 having a stirring blade 6 at the tip is attached to a frame 8, a driving means 9 for rotating the rotating shaft 7 is provided on the frame 8, and the frame is moved around the width of the ship. It is attached to a frame body shifting device 10 that allows reciprocating movement in the direction.

5. Guide rollers (not shown) are provided on both side walls of the frame 8.
is provided, and the guide roller is fitted into a guide groove provided on the inner surface of the guide column 11.

This frame body 8 is provided with an elevating motor 12, and a pinion rotated by the elevating motor 12 meshes with a rack provided along the guide column 11 to move the frame body 8 to the guide column. There is no way to move up and down along the line 11.

On the other hand, the frame body shifting device 10 has a guide column 11 supported by an arm frame 13, and the arm frame 13 is slowly swung through a deceleration mechanism 15 by the drive of a motor 14.

Reference numeral 16 denotes an agitator, and 17 a slurry pump, which receives the curing agent supplied from land, stirs and mixes it, and sends it through a hose 18 to the stirring section by the stirring blade.

Here, in this example, both the rotating shaft 7 and the stirring blade 6 are formed hollow, and the curing agent passes through the hollow portion to reach the stirring blade 6, and is ejected from a through hole 19 formed in the stirring blade 6. It's like being forced to do something.

The present hardening treatment apparatus is constructed as described above, and is slowly moved by a traction means such as a winch (not shown).

At this time, the rotary shaft 7 is rotated and moved up and down along the guide column 11, and the arm frame 13 is slowly swung.

Therefore, the inside of the soft soil layer is stirred by the stirring blade and at the same time the hardening process is performed by ejecting the hardening agent, and a continuous hardened wall of a corrugated body having undulations as expected in the present invention is formed.

In the above embodiment, one stirring means that moves up and down is provided on the frame 8, but it is also possible to install several stirring means in parallel, or a device having the same structure may be mounted on a float. It is also possible to install them in parallel.

Figures 5 and 6 show the arrangement of support structures when the curing process is carried out several times or over several days. Although this is an example of a parallel combination, the wavy bodies can be made with an appropriate combination of the same shape and a different shape, that is, with the undulation intervals and sizes appropriately different, as shown in FIG.

In the above embodiments, the directions of the undulations of the corrugated bodies are the same, but the directions can be made to differ as shown in FIGS. 7 and 8.

In this drawing, l indicates the scope of construction to be carried out in one day or one time, and A1 → A2 → A
3..., B1 → B2 → B3..., C1
→C2→C3..., indicates the construction order.

In continuous hardening treatment in soft soil layers, hardening is performed between one construction area l and the next construction area l; There will be a section S in between that will not be joined.
Therefore, the strength of this part will be reduced, but this can be prevented if the undulation spacing, size, or direction of undulations are made to vary appropriately in the front and back or left and right directions of adjacent parts, as shown in the illustrated example. This makes it excellent for creating a stable structure.

In the above embodiment, the undulation of the wavy body is sin or C03in.
Although a curved shape is shown, it goes without saying that a sawtooth shape or a rack tooth shape as shown in FIGS. 2 and 3 may be used.

What is important about these examples is that the structure in the construction area l is hardened into a continuous, integral hardened wall, which is different from the conventional continuous wall in which single piles are placed adjacent to each other.

5. By carrying out the present invention as described above, maximum engineering strength can be obtained with the minimum required amount of stable solidification, and it can be used as a support structure required for civil engineering, not only in support capacity but also in resistance to considerable lateral loads. It is something that can be made bearable.

Furthermore, it becomes possible to omit reinforcing beams 9 such as those used for bridging, which contributes to cost reduction.

[Brief explanation of drawings]

The attached drawings show an example of implementing the method of the present invention,
Fig. 1 is a plan view showing its basic shape, Figs. 2 and 3 are plan views showing other examples, Fig. 4 is a schematic front view of the curing agent processing device, and Figs. 5 and 6 are plan views showing other examples. The plan view of the hardened support structure, FIGS. 7 and 8, are also plan views showing other examples. 1... Soft soil layer, 2... Hardening treatment device, 3... Continuous hardening wall, 6... Stirring blade, 7... Rotating axis, 8,...00. Frame body, 10・
...Frame body transition device, 13... Arm frame, 16
...Agitator, 17...Slurry pump.

Claims (1)

[Claims] 1. When constructing a hardened support structure necessary for civil engineering by stirring and mixing the soft soil and hardening agent in a soft soil layer, the support structure is hardened in several steps. As the construction work to be processed is repeated, the structure in the construction range l to be constructed each time has at least one sin or co si in plan view.
n-kerf - A method for forming a stably consolidated support structure in a soft soil layer, characterized in that the structure is formed into a wavy continuous hardened wall having serrations and rack-tooth undulations. 2. When repeatedly constructing a hardened support structure necessary for civil engineering by stirring and mixing the soft soil and hardening agent in the soft soil layer, the support structure is divided into several times. A continuous hardened wall of a corrugated body having at least one or more sin or CO31n curves, serrations, rack teeth, etc. undulations in the plan view of the structure in the construction range l that is constructed each time by repeating the hardening treatment work. In addition, when a large number of wavy bodies are arranged in combination with each other, the undulation intervals, sizes, and undulation directions are appropriately varied between adjacent front and rear and left and right directions. A method of forming a stably solidified support structure within a soft soil layer.