KR800000650B1 - Method of forming continuous underground walls on weak footing - Google Patents

Abstract

A plurality columns are buried in a row in the ground to which a vertically and rotationally movable hollow rod with a plurality nozzle means is advanced to the predetermined depth to form a cavity in the formation. The rod is retracted from the cavity as it rotates and simultaneously solidification liquid agent is radially pumped through the nozzle means in the ground under 100-400 kg/cm2 pressure. Solid formation is made by mixing the liquid agent with soil to form a column having a bigger diameter than that of rod.

Description

Construction method of underground continuous wall

The drawings show an embodiment of the invention.

1 is an explanatory diagram of construction stages showing the construction sequence when carrying out;

2 is a perspective view showing the state of the continuous underground wall formed by the present invention,

3 is an explanatory diagram showing an actual application.

The present invention relates to a method for forming an underground continuous wall to be formed in the soil in order to stabilize the ground and to prevent water leak or collapse of the soil when constructing the foundation construction or excavation work of the underground structure.

Conventionally, this kind of underground wall was divided into a watertight film with a water function and a reinforcement wall with a function of strengthening the ground, and a watertight film was used for the ground where water leaked out or water rose. In such a soft ground which is likely to collapse, reinforcing walls were formed respectively, and in both of the above-mentioned grounds, reinforcing walls and reinforcing walls were both formed, or a large underground tunnel was dug up to build a special underground wall.

And the exponential membrane was formed by filling the ditches with a narrow ditch made of ground, and the reinforcing wall was formed by placing sheet piles or steel plates, but any of them required much time and effort. It was to.

On the mechanism, the conventional method is to remove the soil of the pile and fill it with filler when filling the column-like pile in the basement, or when the soil is not removed. The structure diagram of the device by mixing soil with a method of stirring using a mechanical stirring blade or spiral pipe collar, or by filling the filling with a mixture of soil to form a pile. There were many difficulties in construction because of the complexity and process.

The present invention is to provide a method for spraying a high binder having high pressure energy, excavating and disintegrating the soil in the ground, while stirring and mixing to evenly mix the high binder and the soil.

This is to provide a way to easily construct a very advantageous underground continuous wall (pile) with the effect of the exponential function and the ground reinforcement function to improve the defects associated with the conventional construction method with less time and effort than before.

The most important difference between the conventional method and the method of the present invention is that the degree of agitation of the injection agent and the soil, that is, the homogeneity of the mixed state, greatly affects the effect of the index and the ground strengthening function.

The ground that mixes and stirs the high settlement and the soil is a relatively soft alluvial layer, which can be divided into sandy soil and viscous soil when viewed as soil.

Among them, sandy soils are soils with good permeability, so soil improvement is made for the purpose of exponent or for both effects of exponent and ground strengthening. Although it is difficult to achieve the exponential effect of the present invention, in the method of the present invention, it is possible to make a homogeneous mixed soil by spraying high binder with high pressure energy and stirring and mixing soil at the same time. Due to the pressure, there is a part where the soil is compressed and the part where high binder penetrates, and the water effect is greatly improved.

On the other hand, viscous clay is composed of soft and water-containing clay silt, which is mainly composed of clay silt. Mixing uniformly with settlement is more difficult than with sand and cannot produce improved soil with uniform strength.

On the contrary, according to the method of the present invention, it is particularly effective for cohesive soils, and it is possible to completely mix the solidifier and the soil.

In other words, cohesive viscous soil is excavated and agitated at the same time by high-pressure spraying high binder, so that the arrangement of particles of soil collapses and at the same time due to the centrifugal force, the compaction of soil particles and the volume of high binder Thus, a mixed layer having a very stable structure is formed, and it has a significant meaning.

Previously, sandy soil was injected into the injection tube, but since there was no aroma regulation of the chemical liquid and there was a significant difference in the density of the ground, the chemical liquid penetrated into the shape of the densely formed gap with the roots of the tree, so that emergency treatment was possible. There was only an expression index function. However, this method makes it possible to form a homogeneous continuous wall even in sandy soil because it is forcibly stirred by spraying. In addition, the stirring method is not a solid stirring blade, it is sprayed and stirred, so that even if there are obstacles or workpieces in the ground, a continuous wall can be formed without any problems.

Embodiments of the present invention will be described below with reference to the drawings.

1 is an explanatory view of the construction stage (1) has a plurality of fluid ejection nozzles on the lower side wall and a control valve for controlling the high settlement ejected from the nozzle at the lower end of the nozzle and the rotation and up and down by the power unit (2) Excavation rods configured to operate as

(3) is a swivel to connect the liquid feed hose and the injection rod connected to the liquid feed pump.

)을 설치하고 제어변을 하방으로 열어 윤활유를 주입하면서 로드를 회전 강하시켜서 도면 (b)와 같이 주입공(注入孔)을 굴착한다.Rod crown at the end of rod (1)

), The control valve is opened downward, the rod is rotated while the lubricant is injected, and the injection hole is excavated as shown in the drawing (b).

After the injection hole is cut to a predetermined depth, the rod is rotated and raised while injecting the ground solid binder at a high pressure of 100-400 kg / cm ² by converting the control valve into lateral injection as shown in (c) and (d). The ground solidifier is ejected as a high-speed fluid from the spray nozzle on the side wall, and the ground soil is disintegrated and stirred in the circumferential shape, and the ground solidified agent is mixed into the stirred soil, as shown in the drawing (e). The soil is solidified by the ground binder to form ground pillars having a diameter of five to six times the rod diameter.

The solidified pillar formed in this way is a very homogeneous and soft mixed layer before being solidified, and it is in a state where steel or steel can be easily inserted from above, so when the steel pillar is inserted into the interior of the solidified pillar before the solidification, It can also be used as a file.

As described above, the characteristics of the present invention are to disintegrate the surrounding soil just by high-pressure ejection of the high binder, and to form a columnar hardened layer having a diameter several times the diameter of the rod inserted into the ground. This is done in succession.

In other words, in the past, the method of stirring soil in the ground had to attach a stirring blade such as a blade to the rod and forcedly agitate the length of the stirring blade to the limit. Due to the solid agitation of the soil, it is difficult to grind the ground, and if there is an obstacle in the ground, it cannot be agitated unless it is broken or the braid is broken, and if there is a workpiece buried in the ground, it cannot be constructed.

However, according to the present invention, since the method of stirring the soil is a jet of fluid, it is possible to form a large columnar hardened layer without destroying the rod even if there is an obstacle in the vicinity, so long as there is an obstacle in the ground. It is particularly effective at stabilizing the ground of a place.

The present invention is to form a ground continuous wall by arranging the ground solidified pillars in a row or a sequence as shown in Fig. 2 by the interaction between the properties of the ejected fluid flowing along the wall of the obstacle and the penetration pressure. The spacing between adjacent hardened layers is formed in close contact to form a complete wall.

In addition, unlike the filling and penetrating ground solidification, it is possible to set the radius range in which the ground solidification is mixed as a pressure, and the ground solidification is mixed with the soil by stirring. It will be able to create a solid underground continuous wall that can also serve to prevent.

In addition, by stopping the injection of the ground fasteners in the steps of Figures 1c, d and by continuously arranging the ground fastener columns in the range it is possible to form a horizontal horizontal wall for the soil bottom improvement.

According to the present invention, since the ground solidification column can be formed at any place in the ground by controlling the injection of the ground solidification as described above, the base wall can be formed by successive continuous reaction force of the shield pressure pipe. The invention has a wide range of applications, such as ground improvement 3a, lake 3b, and foundation 3d of the building, and has a very significant significance.

Claims (1)

At the lower end, there are a plurality of fluid ejection nozzles for injection into the control valve and the side, and the excavation injection rod 1 which is rotated up and down by the power unit 2 is rotated and lowered to excavate the ground solid filler injection hole in the ground to a predetermined depth. Inject the ground solidifier into the rod 1 at a high pressure of 100-400kg / cm ² and spray the ground solidifier from the fluid ejection nozzle to the side of the rod 1 at high speed, while rotating the soil to increase the soil Disintegrate and agitate the ground solidified column in the soil by spraying out of it, and form the ground solidified column having a diameter larger than the diameter of the inserted rod 1, and arrange the ground solidified columns sequentially. Or to form a continuous underground wall by continuously forming.

Images