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Ground Improvement Techniques

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OMS Pile Driving Equipment GmbH. provides a large selection of ground improvement techniques: “vibro compaction”, “vibro replacement” and “vertical drain”. As effective as our products are, choosing the correct equipment for your project might be a challenge. However, our experts on ground engineering can help you to decide on the best equipment for your project.
Today, the social and industrial growth has increased the importance of ground engineering. In fact, the profession plays a crucial role in projects such as power stations or the expansion of infrastructure systems like harbors and airports. Therefore, it is good to consult to an expert before deciding on the method of ground improvement.

METHODS
Deep vibro compaction and vibro replacement methods are mainly to increase the strength of granular soils as well as unfavorable soil conditions. They are also beneficial for the improvement of deformation characteristics of the same type of soil. The two methods work by enhancing the bearing capacity of the weak layer. Then, they utilize the benefit of the improved resistance. Ergo, this results in a transition between deep foundation and soil stabilization. This way, the transition ensures a structural support below or on the improved ground surface both safety and economy wise.

As OMS team, we support our customers by recommending the best soil improvement equipment solutions. Vibro compaction and vibro replacement (stone columns) as well as vertical drain (wick drain) equipment of OMS have proved themselves in the global market from Europe to Middle East, South East Asia and America continent.

VIBRO COMPACTION – TOP FEED GROUND IMPROVEMENT TECHNIQUE
Vibro compaction method is mostly suitable for fine granular soils with seismic risk. For this reason, experts suggest for land reclamation projects to decrease the risk of liquefaction. Furthermore, the technique is useful for the densification of sand-like soils on site through an OMS Vibroflotation prob. Due to the concurrent impact of saturation and vibration, loose sand particles changes into a more compact state. As a result, lateral confining pressure of the sand mass rises.

Vibro compaction top feed technique is convenient for medium to coarse-grained sand with silt content. Cohesive soils with silt and clay does not respond to vibratory compaction.

Vibro Compaction
Tandem Free Hanging Ground Improvement:
The tandem vibro compaction includes two vibroflotation probes. Each prob suspends from the same crane. Land reclamation projects that require 20 – 25 m depth uses this configuration. The quality of compaction/stone column is controllable with a data logger supplied by OMS. Thence, the depth, compaction rate, time-related compaction and withdrawals can be measured and monitored. The data logger is also able to measure the gravel volume.

For further details please click the link below:
https://www.omsvibro.com/ground-improvement-techniques/

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Ground Improvement Techniques

  1. 1. SOIL IMPROVEMENT EQUIPMENT Pile Driving Equipment www.omsvibro.de Vibro Compaction & Vibro Replacement
  2. 2. VIBRO COMPACTION 2 / www.omsvibro.de Stone Column Equipment OMS Pile Driving Equipment GmbH. provides a large selection of soil improvement equipment such as “vibro compaction”, “vibro replacement” and “vertical drain” depending on the project requirements. Ground engineering plays an increasingly important role in social and industrial development, especially in connection with major construction projects such as power stations or the expansion of infrastructure systems (railways, harbours, airports etc.). The objectives of deep vibro compaction and vibro replacement are to improve the strength and deformation characteristics of granular soils to a certain degree, so that structures can be supported safely and economically on or below the improved ground surface. Vibro compaction and vibro replacement can be another option as technical methods which is used for unfavourable soil conditions that provide a transition between deep foundation and soil stabilisation. These methods increase the strength of the weak layer and utilises the benefit of the improved resistance. At this point, the OMS provides the right soil improvement equipment as a solution for its customers. The vibro compaction and vibro replacement (stone columns) combined with vertical drain (wick drain) equipment of OMS plays a crucial role in the market from Germany to Middle East, South East Asia and America Lands. SOIL IMPROVEMENT METHODS USING WITH OMS VIBROFLOTS Vibrocompactionmethodismostlyusedinfinegranularsoilsthatarein seismic risk and thus, the method itself is suitable for land reclamation projects to mitigate the risk of liquefaction. This technique is for densifying sand-like soils on site by means of an OMS Vibroflotation probe. With the simultaneous vibration and saturation impact, loose sand particles are repacked into a more compact state and lateral confining pressure within the sand mass is increased. Vibro compaction technique is most suitable for medium to coarse- grained sand with a silt content. Cohesive soils consisting of silt and clay material does not respond to vibratory compaction. The following illustration explains the operation: (Top Feed System)
  3. 3. 4 / www.omsvibro.de Stone Column Equipment TANDEM FREE HANGING SINGLE FREE HANGING The tandem vibro compaction configuration comprises of two vibroflotation probes suspending from the same crane. The single free hanging vibroflotation probe consists of the same interchangeable parts as the tandem set. Typical Configuration of Vibro Compaction: Vibroflotation Prob Lifting Head Wear Mantle Elastomer Water/Air Jet Nozzle
  4. 4. 6 / www.omsvibro.de Stone Column Equipment Tandem Free Hanging The tandem vibro compaction configuration is consisting of two vibroflotationprobessuspendingfromsamecrane.Itismostlypreferred in land reclamation projects up to 20 - 25 m depth. The quality of compaction/stone column can be monitored with a data logger supplied byOMS.Hence,thedepth,compactionrate,timerelatedcompactionand withdrawals as well as gravel volume can be measured and monitored. Extension Tube Lifting Head Ropes Spreader Beam Vibroflotation Prob
  5. 5. 8 / www.omsvibro.de Stone Column Equipment Single Free Hanging The single free hanging vibroflotation probe comprises of the same interchangeable parts as the tandem set. The depth of compaction or stone column can be deeper, therefore projects that are medium to small scale are suitable for to be executed with single free hanging system. Compared to tandem system, crane capacity of the vibroflotation probe is slightly smaller. On the other hand, just like tandem system, the quality of compaction/stone column can be monitored with a “data logger” so that, depth, compaction rate, time related compaction and withdrawals as well as gravel volume can be measured and monitored.
  6. 6. 10 / www.omsvibro.de Stone Column Equipment VIBRO REPLACEMENT (Bottom Feed System) Vibro replacement stone column is a soil improvement system by which vertical columns of compacted gravel are placed into soil. This is a technique that builds load-bearing columns made out of gravel or crushed stones in cohesive soil and granular soil with high fines content. Vibro replacement stone columns have been used to improve a wide range of soil from very soft clays and peat to materials marginally suitable for the vibro compaction method. The equipment used for the vibro replacement method is (other than for the vibro displacement method) identical to the one used in the vibro compaction method. For the operation of vibro replacement columns (stone/gravel columns) “the bottom feed” process which feeds gravel to the end of the vibroflotation probe with the aid of pressurised air. For the optimum performance of this process, OMS has developed the vibroflotation probe and gravel hooper with pressure chamber. This OMS vibroflotation probes can be mounted on a existing drill rig or leader, crane or an excavator.
  7. 7. 12 / www.omsvibro.de Stone Column Equipment BOTTOM FEED FREE HANGING Probe with a gravel hooper is suspended by a crane. DRILL RIG / LEADER MOUNTED Probe is easy to mount on an existing drill rig or a leader. EXCAVATOR MOUNTED Excavator selection is crucial in this configuration. Typical configuration of Vibro Replacement by Stone Columns:
  8. 8. 14 / www.omsvibro.de Stone Column Equipment Extension Tube Extension Tube Gravel Box Probe Bucket The OMS vibroflotation probe (bottom feed system) with gravel hooper can be easily mounted on existing drill rig or a leader with a supervisor from OMS technical team. This particular configuration is advantageous since the drill rig or leader equipped with a pull-down system, thus, allows additional pull-down pressure to be exerted during penetration and compaction. Drill Rig / Leader Mounted
  9. 9. 16 / www.omsvibro.de Stone Column Equipment The OMS vibroflotation probe (bottom feed system) with a gravel hooper suspended by a crane. For the configuration, the crane capacity should be suitable to carry on suspended weights. Bottom Feed Free Hanging
  10. 10. 18 / www.omsvibro.de Stone Column Equipment This configuration is rather easy to mount on a customers’ excavator by the help of OMS supervision team. It is also easy to operate and cost friendly, however it comes with stone columns of limited depth. Excavator selection plays an important role in this configuration. Excavator Mounted Bottom Feed Vibroflot Gravel Hooper & Feeding Mechanism Extension Tube Extension Tube Extension Arm Yoke Configuration for Bottom Feed Vibroflotation Probe
  11. 11. Technical Specifications Technical Spec. ÖVF 300 - 2 ÖVF 300 - 2 HF ÖVF 300 - 4 ÖVF 400 - 9 HF Eccentric Moment (kgm) 2,026 2,026 4,03 9,1 Frequency (rpm) 3000/50 3600/60 3000/50 2100/35 Centrifugal Force (kN) 200 293 397,8 448,6 Power (kW) 90 108 192,5 131,25 Weight (kg) 1400 1400 2600 2200 Height (H) 2640 2640 3206 3250 Width (W) 348 348 375 434 Length (L) 520 520 722 660 Power Pack PP 200 PP 200 PP 265 PP 265 Output (kW) 147 147 195 195 Power Pack PP 200 PP 265 Output (kW) 147 195 Output (hP) 200 265 Oil Flow (lt/min) 360 360 Working Pressure (bar) 350 350 Diesel Tank Capacity (lt) 600 600 Hydraulic Oil Capacity (lt) 350 350 Weight and Dimensions Length / L (mm) 3700 3700 Width / W (mm) 1590 1590 Height / H (mm) 1935 1935 Weight / kg 3150 3150 * Technical specifications are calculated based on maximum pressure and oilflow. Required flow and pressure can be adjusted according to the requirement. * Power packs are named according to horse power of its engine. Depending on availability of engine, power pack names can be changed. 20 / www.omsvibro.de L W Gravel Tube Gravel Reservoir H
  12. 12. During the vibro compaction and vibro replacement operation number of different site and parameters are automatically recorded. The following parameters can be measured, saved and printed as a proof of production and quantities: ƒƒ Date ƒƒ Site Name ƒƒ Depth of Penetration ƒƒ Compaction Point Reference Number ƒƒ Compaction Rate (Pressure) ƒƒ Volume of Gravel 22 / www.omsvibro.de Stone Column Equipment Control Panel of Data Loggers OMS vibro compaction and vibro replacement systems can easily be adapted to any data loggers of producers. Monitors, which have a membrane keypad and LCD screen, are placed in a waterproof slot. The operator can control the compression process parameters from the screen. Fast Work ReportSearch SettingsTouch ScreenTime Manage Monitoring Reporting
  13. 13. instagram.com/omsvibro youtube.com/user/ozkanlarmakina linkedin.com/company/omsvibro/ facebook.com/omsvibro twitter.com/omsvibro www.omsvibro.de OMS Pile Driving Equipment GmbH. Kleinewefersstraße 1 47803 Krefeld - Deutschland oms@omsvibro.de

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