Machines
Internal vibrators for compacting concrete.
A poker vibrator — also called a vibrating poker or internal vibrator — compacts fresh concrete from the inside. Lowered into the pour, its vibrating head drives out trapped air so the mix settles dense and even around the reinforcement. Proper internal vibration is the difference between durable, watertight concrete and a honeycombed surface that fails early. Across the Lievers range, poker heads run at 12,000 vibrations per minute (VPM) in diameters from Ø28 mm up to Ø65 mm.
Lievers Holland builds vibrating pokers in three families. Battery pokers give you full freedom of movement — no cable, no converter, ideal for residential sites and repair work. High-frequency pokers run on a frequency converter and deliver constant compaction power for heavy, continuous pours. Electric pokers with built-in electronics plug straight into standard power. Every family shares the same principle: strong pendulum action, low maintenance and a housing that survives real jobsites. The battery-powered P18Li, for example, pairs a brushless 18V 450W motor with 12,000 VPM and runs up to 45 minutes per charge — roughly 25 m³ of concrete — from a 2.35 kg drive unit. High-frequency heads in the LHF, HS and HS-ER series range from Ø36 mm to Ø65 mm. The electric P14E draws just 600 W and drives Ø28/38/45 mm heads at the same 12,000 VPM.
Head diameters run from slim pokers for congested reinforcement and thin walls up to heavy heads for mass concrete. As a rule of thumb, the poker's action radius should overlap between insertions — our specialists help you match diameter, frequency and power source to your pour before you buy. In practice that means Ø28 mm heads for tight rebar cages and Ø65 mm heads such as the SFP for mass pours and slipform paving, with centrifugal forces from 2,500 N up to 4,500 N depending on head size.
A poker vibrator (vibrating poker or internal vibrator) is a tool with a vibrating steel head that is lowered into fresh concrete. The vibration drives trapped air out of the mix, compacting it so the concrete cures dense, strong and watertight. Lievers poker heads vibrate at 12,000 vibrations per minute (VPM).
Match the head diameter to the pour: slim heads (25–40 mm) for thin walls and dense reinforcement, mid sizes (40–58 mm) for general work, and larger heads for mass concrete. The vibration radius should overlap between insertions — roughly 8–10 times the head diameter. Lievers heads span Ø28 mm to Ø65 mm across the P14E, P14B, LHF, HS, HS-ER and SFP ranges.
Battery pokers are best when mobility matters: no cables, no converter, instant start. High-frequency pokers powered by a converter are best for continuous, heavy compaction work where constant output over a full shift matters. Many crews run both. The battery-powered P18Li delivers 12,000 VPM and runs up to 45 minutes per charge; high-frequency heads like the LHF/HS series cover Ø36–65 mm for continuous heavy-duty work.
Vibrate each insertion point until air bubbles stop rising and a thin film of mortar closes the surface — typically 5 to 15 seconds. Over-vibration can segregate the mix; under-vibration leaves air pockets.