VIBROFLOTS
Ground treatment with the VibroSTA method meets a wide range of bearing capacity and reliable ground improvement requirements and provides an economical alternative to more expensive deep foundation technologies.
The equipment designed and manufactured by STA was born at the beginning of the ’80 years with the first hydraulic vibroflots. The improvement of the equipment has never stopped during the years increasing the quality and the range of accessories. A particular elastic isolator completely stops the vibrations from the head of the VibroSTA. This isolator is very simple and strong and it has been manufactured also for other constructor’s equipment.
The constant request of more and more productivity and the application of the VibroSTA method in a wide range of soils has created a new method of application named Bottom Feed. For soft saturated more cohesive soils not compactable. The VibroSTA penetrates to the required depth displacing the soil laterally, then it is replaced by stones. The stones which are also compacted create a so called "stone column". With a second pipe near the main extension tubes, the stones are carried into the hole near the tip of the VibroSTA optimizing works in deep water or in particular soft soils.
The whole equipment is composed by a vibrating part which moves thanks to an internal rotative eccentric mass and a pulley block linked to the crane with suspension ropes. The extension pipes link the main parts in order to reach the requested length of the VibroSTA.
A stone tank can be applied at the top of the VibroSTA for the bottom feed method.
The whole system is powered by a due hydraulic power pack designed and manufactured
by STA.
VIBRO STA7500
1.700/1.900 r.p.m.| Power of VibroSTA | 154 kW |
| Operative frequence | 30 Hz |
| Operative centrifugal force | 230 kN |
| Amplitude | 26mm |
| Wear shield | easy to replace and manufactured with wear resistant steel |
| Pulley head | predisposed for oil and water links |
| Extension pipes | Variable lenght available |
| Total weight | 3.800 Kg (10 m applications) |
| Weight of extension | 1.300 Kg |
| POWER PACK V. 7.500 | |
Engine power |
220 KW |
Operative oil flow |
250 lpm |
Oil flow max |
290 lpm |
Pressure |
340 bar |
Oil tank |
1500 lt |
Width |
2000 |
Length |
3600 |
Height |
2050 |
| Weight | 4 Ton |
The Vibro STA is proposed with different models of water pumps that can be normally powered by the power pack V 7500
VIBRO STA7500 IR
2.400/3.000 r.p.m.Power of VibroSTA |
154 kW |
Operative frequence |
50 Hz |
Operative centrifugal force |
230 kN |
Amplitude |
12 mm |
Wear shield |
easy to replace and manufactured with wear resistant steel |
Pulley head |
Predisposed for oil and water links |
Extension pipes |
Variable lenght available |
Total weight |
3.300 Kg 10 m application |
Weight of extension |
1.100 Kg |
The Vibro STA is proposed with different models of water pumps that can be normally powered by the power pack V 7500.
VIBRO STA5000
Power of Vibrolance |
112 kW |
Operative frequence |
50 Hz |
Operative centrifugal force |
120 kN |
Amplitude |
9,5 mm |
Wear shield |
easy replacement and manufactured with special heavy steel |
Extension pipes |
Variable lenght available |
Total weight |
3.800 Kg (13 m) |
Oil flow |
180 lpm |
| Pressure | 310 bar |
STONE TANK AND DATA LOGGER
The vibro can be equipped for the bottom feed method with a stone tank (7 m³ in the picture) and a second extension tube and check valves for the control of the gravel flow.
The valves for the control of the gravel flow between the tank and the top of the vibro and the extension tubes are are hydraulically managed.
The Data Logger collects real time data such as:
- pressure;
- rate of depth;
- flow rates;
- load and pulling force.
The collection of all such data are managed by the due software in order to virtually rebuilt “the story” of the different columns.
The Data Logger System is usefull to control the vibrocompactation of the soil and the working depth.The STA System can also be configured not only for depth and vibrocompactation control but also for loading the gravel at the different steps of the stone column.
The Data Logger display is normally positioned on the crane cabin.
