Ground Improvement

Business Introduction

This applies to the case for improvement of the ground with more densely compactness having increased relative density for coarse ground, like the sand or gravel layer on a classification of soil.
Vibro Compaction Method is to compact and improve loose sandy ground using vibration of the probe after interpenetrating the probe into the targeted ground for improvement, and it will compact the ground in a dense state up to 50~90% of relative density at an interval of 2~5m of compact hole.
After interpenetrating the probe into the ground by vibration power having injected high-pressure water and air, it is to be drawn at regular interval through maintenance period, and, at this time, the earth and sand that flowed in the bottom surface and original ground is going to be compacted.
- Application depth = 3.0 ~56.0 m
- Construction interval = 2.0 ~ 5.5 m
- Improvement degree(Dr) = 75 ~ 100%

The compressive force is determined by the particle distribution of the ground.
A and B soils can be improved by Vibro Cmpaction Method. In the soils of C and D cannot secure soil bearing Value by Vibro Compaction Method alone.
[ Improvement effect ]
① Relative density improvement effect by particle rearrangement
② Improvement of horizontal bearing capacity compared to effective vertical load
③ Enhancement effect by reducing gap ratio (2 ~ 50 times reduction)
④ Shear friction resistance angle enhancement effect (10 degree range)
⑤ Induction of settlement immediately after completion of improvement (2 ~ 15%, generally 5%)
⑥ Ground deformation coefficient enhancement effect (2 ~ 5 times increase)

In order for the purposes, including increase of bearing power and reduction of ground sinking, residual settlement control, and prevention of liquefaction, etc., targeting Fine-Grained Soil ground which is composed of viscous soil and silt, this is a construction method to improve soft ground by adding up a fixed vibration energy to the ground forming gravel compaction pile. According to the frequency of re-interpenetration of Vibro Probe, there are formed the stone columns about Φ800~Φ1500 in diameter.
Generally, it is divided into Wet Top Feed method and Dry Bottom Feed method according to the method of injecting material into the ground, and there are construction methods such as Offshore Stone Column method which can work at sea using pump system.
- Application depth = 3.0 ~ 30.0 m (Offshore S.C > 50m or more)
- Construction interval = 1.0 ~ 3.0 m
- Improvement degree(Dr) = 0.6 ~ 1.5m

It is distributed in the liquid soil C area by the earthquake, and the soil can be improved by constructing Stone Column Method.
D soil is not compacted by vibration, but reinforcement and drainage are possible by constructing Stone Columns.
[ Improvement effect ]
① In the case of soils in areas A, B, and C, the surrounding soil is compacted during the construction of the Stone Column.
② Formed composite ground on soft ground to improve shear strength and settlement characteristics
③ Crushed column promotes consolidation of the ground by draining

Dynamic Compaction was developed by Louise MENARD of France in 1969 and is currently used around the world for soft ground improvement.
10 ~ 50 ton weight on the ground to be improved by using crane to repeat free fall at 10 ~ 40m height Compression Wave and Shear Wave generated from the impact energy generated It is a method of inducing compaction of soil.
The elastic wave of impact energy is transmitted to the ground, and the compression of the ground is promoted by the formation of cracks and flow paths in the vertical direction with the horizontal tensile stress.
Dynamic Compaction is a simple method of inducing soil compaction, but it can be expected to achieve better effects when various measurements and tests are taken in consideration of the surrounding environment and soil conditions.

The SINNUS Grouting Method is an injection process control system developed and applied by Soletangche-Bachy, France.
This is an injection control system that automatically controls the entire process such as research, design, maintenance, and analysis using a computer.
It is a method that can minimize the quality deterioration by controlling a series of grouting operations to secure the reliability of grouting construction.

⦁ ENPASOL SYSTEM
The process to check the condition of the ground during drilling through the sensor of the hydraulic drilling machine

⦁ SAPHYR SYSTEM
The process to quickly grasp and classify the ground situation

⦁ CASTAUR SYSTEM
The process of selecting and designing the most efficient Grouting Patten for ENSASOL data

⦁ SINUS SYSTEM
The grouting construction system automatically adjusts the amount of grouting injection, and the injection results for each injection step are automatically recorded and output, so that the results are analyzed and judged immediately after construction, and re-injection can be controlled according to the results.

⦁ CHAIROC SYSTEM
A process that enables quality control and re-injection judgment by analyzing SINNUS data in various ways with an analysis program