Home > PB28A-3R-II Column-Climbing Concrete Placing Boom — 27.7 m Radius

PB28A-3R-II Column-Climbing Concrete Placing Boom — 27.7 m Radius

The PB28A-3R-II is a column-climbing concrete placing boom designed for internal climbing within high-rise structures. It features a 3-section R-fold boom with a 27.7 m placement radius and continuous 360° slewing capability. Integrated with a stationary or line concrete pump via a riser pipeline, the unit distributes concrete across floor decks, core walls, and shear walls. Operating on a 380V/50Hz electrical supply with an 11 kW motor, the boom is supported by a floor frame or elevator shaft mounting system, utilizing hydraulic climbing mechanisms to elevate alongside the structure's progression.

1. Self-climbing mechanism — Ascends the structure internally via floor frames or shaft frames, eliminating the need for external crane lifts between operational levels.

2. Optimized weight distribution — The 16,200 kg total weight and 4,100 kg maximum lifting unit reduce floor loading and site crane capacity requirements.

3. Counterweight-free design — Operates without a balance arm to minimize the slewing footprint within confined core spaces.

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

5. 3-section R-fold boom — Delivers a 27.7 m radius while folding compactly for climbing and transport sequences.

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

7. Control configurations — Supported by electric-proportional remote, radio, or cable controls utilizing 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	PB28A-3R-II
Performance
Max. Radius of Placing Boom	m	27.7
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 (3-Section R-Fold)
1st Section — Length	m	10.5
1st Section — Articulation	°	0 ~ 86
2nd Section — Length	m	9.2
2nd Section — Articulation	°	0 ~ 180
3rd Section — Length	m	8
3rd 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	11
Hydraulic Pressure	MPa	28
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	16200
Max. Lifting Unit	kg	4100

Dimensions & Working Range

The working-range diagram shows the area the PB28A-3R-II can place concrete across from a single position — the 27.7 m radius swept through a full 360°, plus the vertical envelope of the folding boom. The free-standing height of 21.3 m is the height the boom stands above its support without external bracing. Read the diagram with the climbing-frame and column drawings to plan the installation in your core or on your floor.

Applications

The PB28A-3R-II is engineered for high-rise structures, featuring an internal climbing mechanism that elevates the placing boom synchronously with the building's construction to distribute concrete across each level.

High-rise building cores and shear walls

Facilitates floor-by-floor concrete placement for high-rise towers, distributing material across decks, walls, and columns within a 27.7 m radius via floor frame mounting.

Elevator shafts and core walls

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

Bridge pylons and tall piers

Supports the construction of bridge pylons and tall piers by climbing the structural elements directly, eliminating repetitive crane lifts during continuous pour sequences.

Paired with a concrete pump

Integrates with stationary or line concrete pumps and vertical riser pipelines to distribute concrete across elevated operational levels.

FAQs

What is a column-climbing placing boom?

It is a self-climbing concrete placing boom that ascends internally through floor frames or elevator shafts, elevating with the structure. The PB28A-3R-II provides a 27.7 m distribution radius, allowing independent vertical progression without crane assistance between pours.

Is the placing boom a concrete pump?

No. The placing boom serves 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.

How does it climb the building?

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.

What radius and how many boom sections does it have?

The PB28A-3R-II features a 27.7 m placement radius achieved through a 3-section R-fold boom (10.5 m, 9.2 m, and 8.0 m sections) with continuous 360° rotation.

Is it electric or diesel?

The unit is electrically driven, operating on a 380V/50Hz supply with an 11 kW motor. It requires external site power or a generator and does not feature an onboard diesel engine.

What crane capacity is needed to install it?

The maximum single lifting unit weighs 4,100 kg, determining the minimum required capacity for the site crane during initial assembly. The total installed operational weight is 16,200 kg.

What is included, and how is it delivered?

The standard configuration includes the placing boom, lower support, hydraulic pump station, control cabinet, and remote control. Climbing columns (4/5/6/10 m), floor or shaft frames, delivery pipelines, and installation parameters are specified per project requirements.

Where the PB28A-3R-II fits in the placing-boom range

The PB28A-3R-II is the 27.7 m model in the column-climbing placing boom series, which includes the 31.7 m PB32A-3R-II, the 32.4 m PB33A-4R-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 PB28A-3R-II interfaces with the riser to distribute concrete across floor decks, shear walls, and columns, completing the vertical and horizontal delivery sequence.

Column-climbing vs other configurations

Column-climbing booms are specified for structures where an internal core or elevator shaft facilitates continuous vertical progression. Spider or mobile placing booms serve lower elevations where crane relocation is viable; lattice-tower booms provide extreme free-standing heights via independent masts; and mobile boat booms support marine infrastructure. Selection depends strictly on the structural geometry and construction methodology.