Home > PB21AM-3R Mobile Boat Concrete Placing Boom — 21 m, Boat-Mounted

PB21AM-3R Mobile Boat Concrete Placing Boom — 21 m, Boat-Mounted

The PB21AM-3R is a dedicated mobile boat concrete placing boom designed to overcome the access limitations of land-based equipment. Mounted directly onto a barge or vessel, it provides a 21 m horizontal reach for over-water construction sites. The three-section R-fold boom is fully hydraulically driven and features a 220° articulation on the terminal arm, allowing precise concrete placement into precast molds and tight clearances. Utilizing a modular pin-shaft architecture, the boom assembly ensures rapid mobilization and demobilization on marine platforms. Powered by a 7.5 kW motor (380V/50Hz), it operates in tandem with a separate vessel-mounted concrete pump to deliver continuous supply. Manufactured to CE standards, it integrates premium international hydraulic and electrical components for stable marine performance.

1. Marine Integration — Engineered for vessel mounting, providing critical access to offshore sites and roadless riverbanks.

2. Over-Water Precast — Optimized for on-water production of precast bridge beams, piers, and freeway barriers.

3. 3-Section R-Fold Boom — Fully hydraulic arms extend to a 21 m radius while folding compactly for transit.

4. 220° Terminal Fold — The third arm folds back 220°, enabling precise hose maneuvering within restricted precast forms.

5. 360° Gear Slewing — Mechanical gear drive ensures continuous full-circle rotation around the vessel.

6. Modular Pin-Shaft Assembly — Structural components connect via high-strength pins, facilitating fast installation and dismantling.

7. Dual-Mode Control — Includes wireless radio and cable remote systems for optimal operator positioning.

8. Industrial-Grade Components — Integrates tier-one hydraulic and electrical systems for maximum reliability in marine environments.

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Technial Parameters

Item	Unit	PB21AM-3R (Mobile Boat)
Performance
Max. Radius of Placing Boom	m	21
Free-Standing Height (to boom root joint)	m	4.2
Slewing Range	/	360°
Mode of Slewing	/	Gear Slewing
Application Scenario	/	Mobile Boat
Circumstance Temperature	℃	-20 ~ 55
Power Supply (customisable)	/	380V / 50Hz
Boom (3-Section R-Fold)
1st Section — Length	m	8.4
1st Section — Articulation	°	0 ~ 90
2nd Section — Length	m	6.9
2nd Section — Articulation	°	0 ~ 180
3rd Section — Length	m	5.7
3rd Section — Articulation	°	0 ~ 220
Delivery Line
Delivery Pipeline Diameter	mm	Φ125 × 4.5
Delivery Hose Diameter	in × mm	5" × 3000
Power & Hydraulics
Motor Power	kW	7.5
Hydraulic Pressure	MPa	28
Hydraulic Oil (5℃–55℃)	/	HM46 anti-wear
Hydraulic Oil (-20℃–5℃)	/	HM32 anti-wear
Weight
Total Weight (boom unit)	kg	6400
Max. Lifting Unit	kg	5200

Dimensions & Working Range

The working-range diagram details the 21 m radius operating through a 360° slew, illustrating the steep downward reach enabled by the 220° terminal fold for in-water formwork. The general arrangement outlines the boom's deck integration and operational envelope relative to the vessel. Implementation requires precise marine engineering for vessel stability and mooring calculations.

Applications

The PB21AM-3R is specifically engineered for marine applications, providing precise concrete placement capabilities for over-water construction projects.

Marine & Over-River Infrastructure

Marine Infrastructure: Facilitates concrete placement for structures positioned over waterways where land equipment cannot deploy.

Precast Bridge Components

Precast Components: Enables on-water casting of bridge beams, piers, and columns directly from the deck.

Inaccessible Riverbank Construction

Riverbank Construction: Provides access to isolated riverbank sites lacking road infrastructure for standard boom pumps.

Offshore Concrete Elements

Offshore Elements: Serves the construction of over-water freeway barriers and concrete supports requiring vessel-mounted distribution.

FAQs

What distinguishes the Mobile Boat configuration from land-based models?

The Mobile Boat configuration is specifically designed for vessel or barge mounting, enabling concrete distribution in marine environments and over-water sites inaccessible to standard truck-mounted or stationary booms.

What are the primary applications for this unit?

Primary applications include the construction of over-river bridge piers, precast bridge beams, offshore columns, and riverbank structures lacking road access.

Is this model identical to the PB21AM-3R formwork-climbing boom?

The boom assembly and 21 m reach are identical. The differentiation lies in the mounting configuration: this version is adapted for marine vessel integration, whereas the formwork-climbing version is designed for vertical structural climbing.

Does this unit integrate a concrete pumping mechanism?

No. The placing boom functions solely as a distribution system. It requires a separate stationary concrete pump, typically mounted on the same vessel, to deliver concrete through the pipeline.

What are the power requirements and control systems?

The system requires a 380V/50Hz power supply (customizable) to drive its 7.5 kW motor. Operation is managed via a standard wireless radio remote or cable control system.

How is the boom installed on the vessel?

The boom utilizes a modular design connected by pin shafts, allowing for rapid assembly, installation, and dismantling on the vessel deck. Structural integration with the vessel requires specific marine engineering planning.

What components are included in the standard package?

Standard supply includes the placing boom unit, hydraulic system, control cabinet, and remote controls. Vessel mounting hardware, delivery pipelines, and marine engineering configurations are customized per project parameters.

Marine Concrete Placing Capabilities

The PB21AM-3R Mobile Boat configuration resolves the logistical constraints of over-water construction. By mounting the placing boom directly onto a vessel, it eliminates the reach limitations of land-based equipment. This configuration is essential for infrastructure projects crossing waterways or isolated marine sites.

System Integration on Water

Operation requires a coordinated marine setup. A stationary concrete pump is positioned on the vessel or an adjacent barge to supply the boom. The PB21AM-3R's 220° terminal arm articulation allows operators to maneuver the delivery hose precisely into precast molds and bridge pier forms, replicating the control of a land-based pour in a marine environment.

Deployment Criteria

Specification of this unit is strictly for projects where waterborne access is the only viable method for concrete placement. The modular pin-shaft design ensures the equipment can be efficiently mobilized and demobilized on marine platforms.