Dai Prà plant with turbo mixer, agitator and injection pump in a lifting frame with roof

Colloidal mixing, agitation and grout injection on one frame

Dai Prà Mixing and Injection Plants

Grouting plants from the Italian manufacturer Dai Prà — turbo mixer, agitator and injection pump assembled as one unit, from compact site units to fully automatic stations with datalogger. NASPS supplies, commissions and services them in the Nordics.

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Introduction

Dai Prà S.r.l. is an Italian manufacturer with roots in the early 20th century. The business started in tunnel and bridge construction and has over four generations specialised in machinery for geotechnical works. NASPS is the Nordic distributor and handles supply, commissioning, operator training and service.

A plant is built from three parts. The turbo mixer produces a colloidal grout and handles cement or bentonite at ratios up to 2.5:1 cement to water without additives. The agitator holds the mixed grout and keeps it homogeneous by slow stirring until it is pumped. The injection pump delivers it at the set pressure and flow. For stable grout the agitator should hold at least twice the volume of the mixer.

The plants are used for self-drilling anchors and micropiles, sheet pile and pipe wall sealing, tunnel grouting and post-grouting, jet grouting, soil stabilisation, shotcrete and geothermal work, and for injecting reagents in environmental remediation.

Drive can be electric, diesel, hydraulic or compressed air. Electric plants suit sites with electrification requirements, and the compact units can also run straight off a drilling rig’s hydraulic system.

Any electrically powered plant can be fitted with a datalogger. It records dosing, mix ratio and pumping parameters per work location, stops the injection automatically when a set pressure or volume is reached, and transfers data over USB or a SIM connection so parameters can be followed and adjusted from the office. Daily reports per location support documentation, traceability and billing.

Every plant is configured for the project. Tell us the pressure, flow, number of injectors and level of automation you need — the data sheet below lists what we need to know — and we put together a proposal.

Technical data

Injection pumps

Model	Max pressure	Max output
DE/OL3	70 bar	30 l/min
DE/OL 80	85 bar	60 l/min
DE/OL 80S	110 bar	60 l/min
DE/OL 100	110 bar	100 l/min
DE/OL 130	85 bar	130 l/min
DE/OL 130S	85 bar	215 l/min

Mixers and agitators

Unit	Tank volumes	Power source
Turbo mixer	150 · 300 · 500 · 1000 l	Electric, diesel, hydraulic or compressed air
Agitator	300 · 500 · 750 · 1000 l	Electric, diesel, hydraulic or compressed air

Compact units

Model	Flow rate	Max pressure
Minimix 40	0–60 l/min	0–50 bar
Minimix 50	0–95 l/min	0–120 bar

Packaged plants

Part	DE/OL 80 – T300 – AG500	DE/OL 100 – T300 – AG750
Injection pump	4 kW, 80 bar, 60 l/min	9.2 kW, 110 bar, 100 l/min
Turbo mixer	300 l, 5.5 kW, 700 l/min	300 l, 5.5 kW, 700 l/min
Agitator	500 l, 1.1 kW, 60 rpm	750 l, 1.5 kW, 60 rpm
Dimensions	275 × 112 × h225 cm	240 × 185 × h230 cm
Weight	950 kg	1450 kg
Power supply	32 A	32 A

Automation

Level	Display	Covers
RemoteIn	10 inch	Injection: break pressure, max pressure, volume, GIN stop and constant flow rate. Pressure sensor and flow meter included.
RemoteMes	10 inch	Mixing: three recipes weighed on load cells, compressor, pneumatic valves and water loading pump. Replaces the separate weighing system.
RemoteTot	16 inch	Both of the above in one system.

Figures are indicative and confirmed for each configuration. Plants with automatic mixing (RemoteMes) or full automation (RemoteTot) need more room, roughly 200 × 200 cm, and the footprint is checked against the chosen setup.

Accessories include wash pump with lance and hose reel, water loading pump, weighing system on load cells, compressor with pneumatic valves, hose reels, shotcrete nozzles and excavator attachments, packers, and silo and screw conveyor feeding.

DE/OL 80 plant with 300 l turbo mixer and 500 l agitator on a lifting frame

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