Home > PB33A-4R-II Four-Section Column-Climbing Placing Boom — 32.4 m

PB33A-4R-II Four-Section Column-Climbing Placing Boom — 32.4 m

The PB33A-4R-II is a 4-section column-climbing concrete placing boom designed for internal climbing within high-rise structures. Featuring a 32.4 m placing radius and a 4-section R-fold articulating arm, it provides enhanced maneuverability for concrete placement in dense or obstructed floor layouts. Driven by an 18.5 kW motor with a 30 MPa hydraulic system, the boom operates on a 380V/50Hz supply. It utilizes a fully hydraulic internal climbing mechanism to ascend the building structure synchronously with the construction progress.

Installed on a floor frame or within an elevator shaft/core wall, the boom distributes concrete across floor decks, shear walls, and columns when integrated with a stationary or line concrete pump via a vertical riser pipeline. The unit maintains a 360° continuous slewing capability.

1. Four-section R-fold boom — Four articulating arms provide enhanced folding flexibility compared to 3-section models, allowing the delivery hose to navigate over and around structural obstructions.

2. Reinforced hydraulics — An 18.5 kW motor and 30 MPa system pressure power the additional articulation point and maintain controlled movements under load.

3. Self-climbing mechanism — Ascends internally via floor or shaft frames using hydraulic cylinders, operating independently of external crane lifts between levels.

4. Gear slewing with cushion valve — Enables 360° continuous rotation with integrated cushioning for controlled acceleration and deceleration.

5. 32.4 m reach with a compact fold — The four sections deliver a 32.4 m radius while folding compactly to facilitate climbing sequences within confined cores.

6. Integrated component mounting — Consolidates the hydraulic pump station and electrical control cabinet on the lower support structure.

7. Control configurations — Accommodates electric-proportional remote, radio, or cable controls using Omron and Schneider components.

8. Modular column options — Column lengths (4 m, 5 m, 6 m, 10 m) and climbing frames configure to specific structural geometries.

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Technial Parameters

Item	Unit	PB33A-4R-II
Performance
Max. Radius of Placing Boom	m	32.4
Free-Standing Height (to boom root joint)	m	21.3
Slewing Range	/	360°
Mode of Slewing	/	Gear Slewing
Circumstance Temperature	℃	-20 ~ 55
Power Supply (customisable)	/	380V / 50Hz
Boom (4-Section R-Fold)
1st Section — Length	m	9.51
1st Section — Articulation	°	0 ~ 86
2nd Section — Length	m	7.56
2nd Section — Articulation	°	0 ~ 180
3rd Section — Length	m	7.65
3rd Section — Articulation	°	0 ~ 180
4th Section — Length	m	7.5
4th Section — Articulation	°	0 ~ 180
Delivery Line
Delivery Pipeline Diameter	mm	Φ125 × 4.5
Delivery Hose Diameter	in × mm	5" × 3000
Power & Hydraulics
Motor Power	kW	18.5
Hydraulic Pressure	MPa	30
Hydraulic Oil (5℃–55℃)	/	HM46 anti-wear
Hydraulic Oil (-20℃–5℃)	/	HM32 anti-wear
Installation & Weight
Application Scenario	/	Floor / Shaft Climbing
Balance Arm	/	None
Total Weight	kg	17540
Max. Lifting Unit	kg	4252

Dimensions & Working Range

The working-range diagram maps the operational envelope of the PB33A-4R-II, detailing the 32.4 m horizontal radius across a 360° sweep and the vertical reach of the 4-section folding boom. The free-standing height of 21.3 m indicates the maximum vertical elevation above the support without external bracing. This data should be cross-referenced with structural layouts and climbing-frame specifications to plan core integration.

Applications

The PB33A-4R-II provides enhanced articulation for concrete placement in dense or obstructed floor layouts, navigating rebar and columns effectively.

Congested high-rise floors

Facilitates floor-by-floor concrete placement for high-rise towers, utilizing a 4-section fold to maneuver the delivery hose precisely between structural obstructions.

Core walls and elevator shafts

Utilizes shaft frame mounting for internal climbing within elevator shafts or core walls, optimizing space in restricted floor plate designs.

Heavy and complex structural pours

Sustains demanding structural pours using 30 MPa hydraulic pressure to maintain stability across the 4-section boom while fed continuously through the riser.

Bridge pylons and tall piers

Integrates with stationary or line concrete pumps to distribute concrete across elevated operational levels and tall bridge pylons.

FAQs

What does the “4R” in PB33A-4R-II mean?

It denotes a four-section R-fold boom. The fourth articulation point provides enhanced folding flexibility, allowing the boom to maneuver over and around structural obstructions in congested layouts compared to 3-section models.

How does it differ from the 3-section PB28A and PB32A?

The PB28A-3R-II (27.7 m) and PB32A-3R-II (31.7 m) utilize 3-section booms with 11 kW / 28 MPa hydraulic systems. The PB33A-4R-II achieves a 32.4 m radius using 4 sections, supported by an upgraded 18.5 kW / 30 MPa hydraulic system to drive the additional articulation under load.

How does the boom climb the building?

Yes. The system utilizes hydraulic cylinders to lift the boom assembly through floor frames or shaft frames. The boom elevates by its own standing height as the structure rises, operating independently of site cranes.

Is the placing boom a concrete pump?

No. The placing boom functions strictly as the distribution terminal. A separate stationary or line concrete pump is required to drive concrete up a vertical riser pipeline to the boom.

Electric or diesel?

The unit is electrically driven, operating on a 380V/50Hz supply with an 18.5 kW motor. It requires external site power or a generator and does not feature an onboard diesel engine.

What weight and crane capacity should we plan for?

The maximum single lifting unit weighs 4,252 kg, determining the minimum capacity required for the site crane during initial assembly. The total operational weight is 17,540 kg.

What is supplied, and how is it shipped?

The standard configuration includes the placing boom, lower support, hydraulic pump station, control cabinet, and remote controls. Climbing columns, floor or shaft frames, and delivery pipelines are specified per project requirements.

Column-climbing placing boom series

The PB33A-4R-II is the 32.4 m model in the column-climbing placing boom series, which includes the 27.7 m PB28A-3R-II, the 31.7 m PB32A-3R-II, the 32.6 m PB33D-4R, and the 34.7 m PB35A-4R-E. The comprehensive B8 series provides six mounting configurations: column-climbing, formwork-climbing, mobile spider, wheeled mobile, lattice tower, and mobile boat booms. The column-climbing configuration is deployed for internal vertical progression within high-rise structural cores.

System integration with concrete pumps

The placing boom operates as the terminal distribution equipment in high-rise applications. Concrete is transported to the site and pumped vertically via a stationary or truck-mounted line pump through a fixed riser pipeline. The PB33A-4R-II interfaces with the riser to distribute concrete across floor decks, shear walls, and columns, completing the vertical and horizontal delivery sequence.

3-section vs 4-section configurations

The 3-section (3R) booms, such as the PB28A-3R-II and PB32A-3R-II, are optimized for open floor plans. The 4-section (4R) booms, like the PB33A-4R-II, incorporate an additional articulation point to maneuver the delivery hose through dense rebar and congested structural layouts. Selection between 3R and 4R models depends on the specific structural density and required maneuverability on site.