HYDRAULIC CASING OSCILLATORS

Hydraulic Casing Oscillators “Long” Type VRM Series

LEFFER Hydraulic Casing Oscillators offer performance and reliability in challenging pile construction applications. Mounted to a crane, the VRM Series “Long” Hydraulic Casing Oscillators are ideal for boring large diameter, deep piling shafts in variable or indeterminate soil conditions where there is risk of collapse. Individual VRM Series “Long” casing oscillator models are available for casing diameters from 1300 to 3800mm. The design and construction of LEFFER casing oscillators are based on continuous improvement stemming from close cooperation and experience with leading pile foundation companies. Proven through decades of construction experience, LEFFER VRM Series Casing Oscillators are precision engineered to deliver maximum boring speed/drilling productivity, minimize downtime, and years of reliable service.

LEFFER VRM Series “Long” Hydraulic Oscillator Features & Benefits Summary

Features	Benefits
5 Link design for casing clamping collar	5 Link design for casing clamping collar Superior casing grip for boring. Exerts “chain-like” constant surface pressure around the circumference of the casing
Tall casing clamping collar (400-700mm)	Minimizes damage to casings. Superior casing grip.
Exchangeable reducer pieces	Oscillator can be converted within minutes for smaller casing diameters on the job site without special tools. Secure clamping for casings below nominal diameter
Uniform collar opening mechanism	Easy insertion of casings with cutting shoes
Stress relief processes in manufacturing	Improved reliability by eliminating welding stresses
Advanced materials & metallurgy	Optimal balance of load, weight, and strength
Low height on excavation side	Faster excavation – easier access to borehole for tools

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Hydraulic Casing Oscillators “Short” Type VRM KL Series for Rotary Drill Rigs

LEFFER’s Hydraulic Casing Oscillators offer performance and reliability in challenging pile construction applications. Mounted to a rotary drill rig, the VRM KL Series “Short” Hydraulic Casing Oscillators are ideal for boring piling shafts in variable or indeterminate soil conditions where there is risk of collapse. Individual VRM KL Series “Short” casing oscillator models are available for casing diameters from 1200 to 2500 mm. VRM KL Series casing oscillators are compatible with all major European drilling rigs and may be powered directly from the drill rig or by a separate LEFFER hydraulic power pack.

The design and construction of LEFFER Casing Oscillators are based on continuous improvement stemming from close cooperation and experience with leading pile foundation companies. Proven through decades of construction experience, LEFFER VRM KL Series Casing Oscillators are precision engineered to deliver maximum boring speed/drilling productivity, minimize downtime, and years of reliable service.

LEFFER VRM KL Series “Short” Hydraulic Oscillator Features & Benefits Summary

Features	Benefits
Rigid, torque resistant attachment of collar to excavator body	Transmits full rotary movement to casing during oscillation Superior boring performance
Tall casing clamping collar (340-500mm) Minimizes damage to casings. Superior casing grip.	Minimizes damage to casings. Superior casing grip.
Exchangeable reducer pieces	Oscillator can be converted for smaller casing diameters within minutes on the job site without special tools. Secure clamping for casings below nominal diameter
Uniform collar opening mechanism	Uniform collar opening mechanism Easy insertion of casings and casings with cutting shoes
Stress relief processes in manufacturing	Improved reliability by eliminating welding stresses
Advanced materials & metallurgy	Optimal balance of load, weight, and strength
Low height on excavation side	Faster excavation – easier access to borehole for tools