The PB21AM-3R Mobile Boat is a concrete placing boom mounted on a vessel, so it can reach work out on the water. Carried on a boat or barge, it travels by river to sites that land-based equipment cannot serve — structures built over a river, or riverbanks with no road for a large placing boom or a truck-mounted boom pump. Once on station, it places concrete over a 21 m radius through a three-arm R-fold boom that slews a full 360°, with an end section that folds back through 220° for tight placing into forms. It is a TRUEMAX specialty product, built for over-water construction that other equipment struggles to reach.
Its main use is producing precast concrete structures over the river: precast bridge beams, bridge piers and columns, freeway barriers and concrete columns, cast on the water close to where they are needed. The boom is assembled from modules that pin together quickly, so it is straightforward to install on the vessel, dismantle and move on. As with every placing boom it does not pump — a separate concrete pump on the vessel or barge feeds it — and it runs on a 380V/50Hz supply with a 7.5 kW motor. It is built and tested at the TRUEMAX factory in Haining to ISO 9001:2015 and CE standards, within a line exported to more than 120 countries.
1. Boat-mounted for water access — Mounted on a vessel, the boom travels by river to reach over-water sites and roadless riverbanks that land-based placing booms and truck-mounted boom pumps cannot get to.
2. Built for over-river precast work — Designed to produce precast concrete structures on the water — bridge beams, piers, columns and freeway barriers — placed where they are needed over the river.
3. 21 m three-arm R-fold boom — Three fully-hydraulic R-fold arms reach a 21 m radius and fold compactly for transport on the vessel.
4. 220° end-section fold — The third arm folds back through 220°, so the hose can tuck in tight to place precisely into precast forms and around obstructions.
5. Full 360° gear slewing — Gear-driven slewing turns the boom a complete circle to serve forms and pours all around the vessel.
6. Modular pin-shaft assembly — Modules connect quickly by pin shafts, making the boom fast to install on the boat, dismantle and relocate between water sites.
7. Radio and cable remote control — Two operating modes — wireless radio and cable remote — let the operator place concrete from the best position on the vessel.
8. Quality components — Hydraulic and electrical parts from well-known international brands for stable, reliable operation on the water, on a 380V/50Hz, 7.5 kW drive.
