Home > PB32A-3R-II — 31.7 m Column-Climbing Concrete Placing Boom

PB32A-3R-II — 31.7 m Column-Climbing Concrete Placing Boom

With a 31.7 m placing radius, the PB32A-3R-II is the longer-reach option in the TRUEMAX column-climbing placing-boom line. It is the model to specify when one set-up has to cover a larger floor plate or a wider building footprint than a 28 m boom can sweep — its extra reach comes from a longer 14.5 m root section on the same 3-section R-fold boom, while the second and third sections, 360° slewing and compact fold stay the same. Like the rest of the column-climbing family, it is fully hydraulic and climbs the structure itself, rising with the building instead of being craned up between floors.

On site, the PB32A-3R-II stands on a floor frame or inside the core or elevator shaft and jacks itself upward as the tower grows. A separate concrete pump feeds it up a vertical riser; the boom then spreads that concrete across the deck, walls and columns — it is the distribution end of the system, not the pump. It draws from a 380V/50Hz supply through an 11 kW motor and carries no engine of its own. Built and tested at the TRUEMAX works in Haining and certified to ISO 9001:2015 and CE, it belongs to a placing-boom line that TRUEMAX exports to high-rise and bridge sites in over 120 countries.

1. 31.7 m reach for wider coverage — A longer first arm extends the placing radius to 31.7 m, so the boom sweeps a larger area from each position and is repositioned less often on big floor plates.

2. Self-climbing with the structure — Mounted on a floor or shaft frame, it lifts itself up its own height as the building rises, removing the per-floor crane lift a fixed boom would need.

3. Full 360° gear slewing, cushioned — Gear drive turns the boom through a complete circle, and a slewing cushion valve takes the shock out of starting and stopping for controlled placing.

4. Fully hydraulic 3-section R-fold boom — The three R-fold sections articulate to reach over and around obstructions, then fold tight for climbing and shipping.

5. Light, balance-arm-free design — No counterweight arm means freer rotation in a tight core, and the low overall and lifting-unit weight (4,150 kg per piece) keep floor loading and crane demand modest.

6. One integrated base unit — Pump station and electric cabinet share the lower support, so installation is quicker and there are fewer connection points to fail.

7. Operator's choice of control — Run it on the TRUEMAX electric-proportional remote or on switch-type radio and cable remotes, wired with Omron / Schneider components.

8. Configurable, durable hardware — Imported hydraulic hose and push-in couplers throughout; specify columns in 4 m, 5 m, 6 m or 10 m lengths and a floor or shaft climbing frame to match the structure.

Get a Quick Quote

Technial Parameters

Item	Unit	PB32A-3R-II
Performance
Max. Radius of Placing Boom	m	31.7
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	14.5
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	18150
Max. Lifting Unit	kg	4150

Dimensions & Working Range

Swept through 360°, the 31.7 m radius covers a circle roughly 63 m across from one set-up — useful for keeping a large floor plate within reach of a single boom position. The working-range diagram maps that envelope together with the boom's vertical fold, and the 21.3 m free-standing height is how high the boom stands above its support without extra bracing. Use it with the column and climbing-frame drawings to plan where the boom sits in your core.

Applications

The PB32A-3R-II suits tall buildings with larger floors, where the extra reach earns its place by covering more ground from each climbing position.

Large-floor-plate towers

On wide residential and commercial towers, the 31.7 m radius reaches further across the slab, so fewer set-ups are needed to pour a full floor than with a shorter boom.

Core walls and elevator shafts

Fitted with a shaft frame, it climbs inside the core or lift shaft and places concrete to the surrounding deck and walls — the right setup where the core leads the build and floor space is limited.

Podium and transfer slabs

Thick transfer slabs and podium decks that need concrete spread over a broad area benefit from the wider sweep, fed continuously by the pump through the riser.

Bridge pylons and tall piers

As with the rest of the self-climbing range, the PB32A-3R-II can climb a rising pylon or pier and place concrete without a crane lift for each section — a pattern TRUEMAX booms run on major bridge projects.

FAQs

Why choose the 31.7 m PB32A-3R-II over the 27.7 m PB28A-3R-II?

Reach. The two are the same column-climbing platform — same 3-section R-fold boom, 360° slewing, 11 kW motor and floor/shaft climbing — but the PB32A-3R-II carries a longer 14.5 m first arm for a 31.7 m radius instead of 27.7 m. Choose it when your floor plate is large enough that the extra 4 m of reach saves repositioning; choose the PB28A when 27.7 m already covers the floor.

How large a floor can it cover from one position?

Slewing a full 360° at a 31.7 m radius, the boom can place concrete anywhere inside a circle about 63 m across from a single set-up. Larger floors are poured by relocating the climbing position, or by combining more than one placing boom on very big plates.

Does it climb the building by itself?

Yes. It sits on a floor frame or a shaft frame and jacks itself up its own standing height as the structure rises, so it does not need a crane to move it to the next level — the defining feature of a column-climbing (self-climbing) placing boom.

Is the placing boom the same as a concrete pump?

No — it is the placing tool, not the pump. The concrete is delivered by a separate stationary or line pump up a riser pipeline, and the PB32A-3R-II distributes it across the floor. The two work as a pair on high-rise pours.

Does it run on diesel or electricity?

Electricity — a 380V/50Hz supply driving an 11 kW motor, with voltage and frequency adjustable to your grid. There is no on-board diesel engine, so it can run from mains power or a site generator.

What does it weigh, and what crane is needed to erect it?

Installed weight is 18,150 kg, but the figure that matters for erection is the maximum single lifting unit — 4,150 kg — because the boom is assembled from modular pieces. That keeps the required site crane capacity moderate.

What is supplied, and how is it shipped?

You receive the boom, lower support, hydraulic pump station, control cabinet and remote. Columns, the floor or shaft climbing frame, delivery line, hose, spares, installation and commissioning are configured to your building and quoted separately. Send us your floor layout and core details for a tailored proposal.

Choosing reach across the column-climbing range

TRUEMAX builds the column-climbing placing boom in a ladder of radii: the PB28A-3R-II at 27.7 m, this PB32A-3R-II at 31.7 m, the PB33A-4R-II at 32.4 m, the PB33D-4R at 32.55 m and the PB35A at 35 m. The shorter models suit compact floors and cores; the longer ones cover wider plates from fewer positions. Beyond reach, the 4R models add a fourth boom section for a different fold geometry. Match the radius to your largest floor and the boom count to your pour rate.

The placing boom's role in high-rise concreting

Concrete starts at a batching plant, travels to site in a truck mixer, and is lifted up the building by a stationary or line concrete pump through a riser. The placing boom is what turns that single pipe outlet into full-floor coverage: the PB32A-3R-II takes the concrete at the top and lays it precisely across slab, walls and columns. Without a placing boom, crews would drag heavy end-hose by hand; with one, a single operator places a whole floor by remote.

When a column-climbing boom beats a free-standing or mobile one

A column-climbing boom is the economical choice when a tall core or shaft leads the build, because it rides the structure upward and needs no separate tower. A lattice-tower placing boom, by contrast, stands on its own mast for free-standing reach where there is nothing to climb; a spider or mobile boom is repositioned by crane or wheels on lower, spread-out work. For a high-rise tower with a strong core, the self-climbing PB32A-3R-II is usually the most efficient way to keep the placing boom rising with the floors.