Performance

Increase bearing capacity, stiffness, sheer strength
Reduce permeability, reduce foundation settlement
Slope stabilization

Process

HLS construction team will provide the best method to densify the grainy or loose soil.
A high-powered vibrating machine is rigged to a crane and lowered into the ground. After the predetermined depth is reached, sand infill or another material is added in piles on the surface. 
The machine’s vibrations move the infill down into the ground in various increments so the soil below can be compacted properly, it moves up in lifts, and this process is repeated until the soil below has been treated.
The vibratory energy reduces the inter-granular forces between the soil particles, allowing them to move into a denser configuration, typically reaching a relative density of 70 to 85%. 

The treated soils have increased density, friction angle and stiffness.
The vibro compaction penetration spacing is between 6 feet and 14 feet, with centers arranged on a triangular or square pattern, which allows the use of economical spread footings with acceptable settlements and design bearing pressures generally in the range of of 5 ksf up to 10 ksf. 
The required treatment depth is designed for each project and is typically in the range of 15 to 50 feet with a maximum depth of 120 feet.
Vibro compaction rigs can be fully instrumented with an on-board data acquisition system.

Quality Assurance

The vibro equipment we use is designed and manufactured by our equipment manufacturer exclusively for use by HLS companies.

Quality production manager software enables us to capture and analyse data in real time and valid the performance of the ground improvement being carried out. A variety of production parameters are generally logged during execution including depth, current, pull down force, uplift/pull down sequence, time and date and element number. Field trials can also be used to verify column production parameters, along with static load tests, single or group, column material compressive strength tests, and column diameter verification.