Home > PB33D-4R — 32.55 m Lightweight Four-Section Column-Climbing Placing Boom

PB33D-4R — 32.55 m Lightweight Four-Section Column-Climbing Placing Boom

The PB33D-4R offers the same four-section reach as the heavier PB33A-4R-II but in a markedly lighter package. It places concrete over a 32.55 m radius through four articulating R-fold arms, yet the whole machine weighs 16,000 kg — over four tonnes less than the PB33A — and its heaviest single piece is just 4,000 kg. For a project, that lighter weight has two practical payoffs: less load imposed on the floor the boom climbs, and a smaller, cheaper crane to erect and relocate it. Where weight and crane capacity are the constraint rather than raw reach, this is the four-section boom to choose.

A second difference sits at the tip: the fourth arm articulates through 200° rather than the usual 180°, so the end section folds back further and tucks the hose in close — handy for placing under slabs, behind walls and into recesses near the boom. In every other respect it is a true column-climbing boom: it climbs the building on a floor or shaft frame, rises with the structure, and distributes concrete that a separate stationary or line pump feeds up the riser. It runs on a 380V/50Hz supply through an 18.5 kW motor, is built and tested at TRUEMAX in Haining, carries ISO 9001:2015 and CE certification, and belongs to a line exported to over 120 countries.

1. Lightweight for its reach — At 16,000 kg the PB33D-4R is one of the lightest 32 m-class column-climbing booms, which reduces the load on the climbing floor and the structure carrying it.

2. 200° end-section fold — The fourth arm articulates to 200°, folding back further than a standard boom so the end hose tucks in tight to place under, behind and close to the boom.

3. Lower crane requirement — With a maximum single lifting unit of 4,000 kg, the boom can be erected and moved up by a smaller crane than heavier models of the same reach.

4. Four-section R-fold boom — Four articulating arms give a flexible fold and a 32.55 m radius, threading concrete into congested layouts and stowing compactly for climbing.

5. Self-climbing on the structure — Mounted on a floor or shaft frame, it jacks itself up its own height as the building rises — no crane lift between floors.

6. Full 360° gear slewing — Gear slewing turns the boom a complete circle, with a cushion valve smoothing start and stop.

7. Balance-arm-free, integrated base — No counterweight arm for free rotation in a tight core; pump station and control cabinet share the lower support for fast install and fewer faults.

8. Flexible control and configuration — TRUEMAX electric-proportional, radio and cable remotes on Omron / Schneider electrics; columns in 4–10 m lengths with floor or shaft climbing frames.

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Technial Parameters

Item	Unit	PB33D-4R
Performance
Max. Radius of Placing Boom	m	32.55
Free-Standing Height (to boom root joint)	m	21.35
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	9.65
1st Section — Articulation	°	0 ~ 89
2nd Section — Length	m	7.706
2nd Section — Articulation	°	0 ~ 180
3rd Section — Length	m	7.7
3rd Section — Articulation	°	0 ~ 180
4th Section — Length	m	7.5
4th Section — Articulation	°	0 ~ 200
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	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	16000
Max. Lifting Unit	kg	4000

Dimensions & Working Range

The working-range diagram shows the 32.55 m radius swept through 360°, with the extra reach into and under the envelope that the 200° end fold provides. The 21.35 m free-standing height is how high the boom stands above its support unbraced. Because the machine is light, the floor-loading figures it imposes through the climbing frame are correspondingly lower — read the diagram with the load and crane data when planning the install.

Applications

The PB33D-4R suits high-rise work where keeping weight down — on the structure and on the crane — matters as much as reach.

Weight-sensitive structures

On buildings where floor-loading limits are tight, the lighter 16,000 kg boom imposes less on the climbing floor than heavier 32 m-class booms while still covering the slab.

Sites with limited crane capacity

Where the tower crane is modest or heavily booked, the 4,000 kg maximum lifting unit lets the boom be erected and climbed with less crane time and a smaller hook.

Tight placing near the boom

The 200° end fold lets the hose reach back under the boom and into recesses, useful for placing close to the core, beneath slab edges and behind walls.

Frequently relocated installations

Its lighter weight makes the PB33D-4R quicker and cheaper to move between positions or buildings, suiting contractors who cycle the boom across several pours.

FAQs

PB33D-4R or PB33A-4R-II — which should I choose?

They are close in reach — 32.55 m versus 32.4 m — and both are four-section booms, so the decision is about weight and duty. The PB33D-4R is lighter (16,000 kg vs 20,100 kg), needs a smaller erection crane (4,000 kg vs 4,800 kg max lifting unit) and adds a 200° end fold. The PB33A-4R-II runs higher 30 MPa hydraulics for heavier, sustained duty. Choose the PB33D-4R when floor loading or crane capacity is the limit; choose the PB33A-4R-II for the most demanding continuous pours.

What does the 200° end-section fold give me?

The fourth arm folds back to 200° instead of the usual 180°, so the end hose can tuck in close to the boom and reach under and behind itself. That helps place concrete near the core, beneath slab overhangs and in recesses that a boom with a 180° end section cannot tuck into.

Why does a lighter boom matter on a high-rise?

Two reasons. First, the boom climbs on the floor it serves, so a lighter machine imposes less load on that floor and the structure beneath it. Second, the boom is lifted and climbed by crane during erection — a lower maximum lifting unit means a smaller, cheaper crane and less crane time. On weight- or crane-constrained jobs, those add up.

How does it climb, and is it a pump?

It climbs on a floor frame or a shaft frame, jacking itself up as the structure rises. It is not a pump: a separate stationary or line concrete pump feeds concrete up a riser, and the PB33D-4R distributes it across the floor. Pump and placing boom work as a pair.

Electric or diesel?

Electric — a 380V/50Hz supply driving an 18.5 kW motor, with voltage and frequency customisable. No on-board engine; it runs from mains or a generator while the pump supplies the concrete.

What is supplied, and how is it shipped?

The package is 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 your floor layout and crane details and we will propose a configuration.

Choosing between the two four-section booms

TRUEMAX builds two four-section column-climbing booms at almost the same 32.5 m reach, for two different priorities. The PB33A-4R-II is the heavier-duty unit, with 30 MPa hydraulics for demanding continuous pours. The PB33D-4R is the lightweight unit, four tonnes lighter, with a smaller lifting unit and a 200° end fold — built for jobs limited by floor loading or crane capacity rather than by pumping duty. Same reach, four sections each; the choice is weight and duty, not radius.

The placing boom and the pump that feeds it

On a high-rise pour the concrete travels from batching plant to truck mixer to a stationary or line pump, which lifts it up a riser to one point on the working floor. The placing boom turns that point into floor-wide coverage. The PB33D-4R does this with four light, articulating sections, so one operator can place a whole floor by remote — and because the boom is light, it is easier to keep moving up with the build.

How boom weight shapes a high-rise plan

Specifiers often start with reach, but on tall buildings the weight of the placing boom drives two parts of the plan: the temporary loading the climbing frame applies to each floor, and the crane schedule for erecting and climbing the boom. A lighter boom like the PB33D-4R eases both, which can simplify the structural checks on the climbing floors and free crane hours for other lifts. Where those constraints bite, a lightweight four-section boom is often the more practical answer than a heavier one of the same reach.