Home > PB51AT-4R-E Lattice Tower Concrete Placing Boom — 51 m Radius

PB51AT-4R-E Lattice Tower Concrete Placing Boom — 51 m Radius

The PB51AT-4R-E is the flagship of the TRUEMAX placing-boom range — the largest the company builds. It is a free-standing lattice tower placing boom that reaches a 51 m radius from a 46 m free-standing height, combining the greatest reach and the greatest height of any TRUEMAX boom in a single, self-supporting tower. Where the 38 m model serves large pours, the PB51AT-4R-E is built for the very largest: vast floor plates and tall structures that demand maximum coverage from one fixed position.

That scale is carried by a heavier-duty mast. The PB51AT-4R-E stands on 2 × 2 m lattice sections — twelve standard L68A1 sections on a 2 × 2 × 7.5 m base — noticeably bigger and stronger than the 1.6 m mast of the 38 m model, sized to hold the longer 51 m boom and the greater height. It self-erects, adding its own mast sections through a telescopic cage, and runs electro-hydraulic proportional control for smooth movements at the scale of a 21.5 m first boom section. Fed by a separate concrete pump up the mast, it runs on a 380V/50Hz supply with a 37.5 kW motor, and is built and tested at the TRUEMAX factory in Haining to ISO 9001:2015 and CE standards, within a line exported to more than 120 countries.

1. Largest 51 m reach — TRUEMAX's biggest placing boom — a 51 m radius covers the widest footprint of any model in the range from a single tower position.

2. 46 m free-standing height — The tower stands 46 m on its own mast unbraced, the greatest free-standing height in the range, and more when tied into an adjacent structure.

3. Heavy-duty 2×2 m lattice mast — Twelve 2 × 2 × 3 m L68A1 sections on a 2 × 2 × 7.5 m base form a stronger mast than the smaller tower model, engineered to carry the longer boom and greater height.

4. Self-erecting tower — A telescopic cage with its own pump and cylinder raises the tower and adds standard mast sections, so it builds its own height as construction rises.

5. 51 m four-section boom — Four R-fold sections — a long 21.5 m first arm and three ~9.8 m arms — extend to the full 51 m radius.

6. Electro-hydraulic proportional control — Proportional control keeps the long boom's movements smooth and low-shock at this scale, for precise, stable placing.

7. Full 360° gear slewing — Gear slewing turns the boom a complete circle at the top of the mast.

8. Radio remote, quality components — Wireless radio remote operation, with hydraulic and electrical parts from well-known international brands, on a 380V/50Hz, 37.5 kW drive.

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Technial Parameters

Item	Unit	PB51AT-4R-E
Performance
Max. Radius of Placing Boom	m	51
Free-Standing Height (to boom root joint)	m	46
Slewing Range	/	360°
Mode of Slewing	/	Gear Slewing
Application Scenario	/	Lattice Tower
Circumstance Temperature	℃	-20 ~ 55
Power Supply (customisable)	/	380V / 50Hz
Boom (4-Section R-Fold)
1st Section — Length	m	21.5
1st Section — Articulation	°	0 ~ 86
2nd Section — Length	m	9.8
2nd Section — Articulation	°	0 ~ 180
3rd Section — Length	m	9.8
3rd Section — Articulation	°	0 ~ 180
4th Section — Length	m	9.9
4th Section — Articulation	°	0 ~ 180
Delivery Line
Delivery Pipeline Diameter	mm	Φ125 × 4.5
Delivery Hose Diameter	in × mm	5" × 3000
Tower Structure
Telescopic Cage	/	Incl. pump & cylinder
Mast Section (L68A1)	m	(2 × 2 × 3) × 12
Base Section	m	(2 × 2 × 7.5) × 1
Power & Hydraulics
Motor Power	kW	37.5
Hydraulic Pressure	MPa	30
Control	/	Electro-hydraulic proportional
Hydraulic Oil (5℃–55℃)	/	HM46 anti-wear
Hydraulic Oil (-20℃–5℃)	/	HM32 anti-wear
Weight
Total Weight	kg	66000
Max. Lifting Unit	kg	14800

Dimensions & Working Range

Swept through 360°, the 51 m radius reaches across a circle roughly 102 m wide from one tower position — the largest single-set-up footprint TRUEMAX offers. The working-range diagram shows that envelope alongside the 46 m mast height. Because the tower and boom are large and heavy, the foundation and the mast tie-ins are central to the install plan — read the diagram with the foundation, mast and tie-in drawings.

Applications

The PB51AT-4R-E is for the largest and tallest pours, where maximum reach and height from one free-standing position is the deciding factor.

Landmark and very tall structures

Standing free to 46 m and adding mast sections as work rises, the boom serves landmark towers and tall structures from a fixed tower, covering a wide area at each level.

Very large foundations and rafts

The 51 m radius reaches across the largest rafts, mat foundations and podium decks from one position, minimising set-ups on the biggest footprints.

Major infrastructure and civil works

Large dams, big piers and major civil structures suit a free-standing boom that brings both extreme reach and height without relying on the structure for support.

Where maximum reach and height are both required

When a pour needs the greatest reach and the greatest height together from an independent boom, the PB51AT-4R-E is the model in the TRUEMAX range built to deliver both.

FAQs

PB51AT-4R-E or PB38BT-4R-E — which lattice tower should I choose?

Scale. The PB51AT-4R-E is the flagship — 51 m radius and 46 m free-standing height on a heavier 2 × 2 m mast — for the very largest, tallest pours. The PB38BT-4R-E reaches 38 m at 40 m free-standing on a lighter 1.6 m mast, for large but not maximum work. The flagship needs a bigger erection crane (14,800 kg vs 9,700 kg lifting unit) and a larger foundation, so choose it when the structure genuinely calls for the extra reach and height.

How large an area can it cover from one position?

Slewing 360° at a 51 m radius, the boom reaches across a circle about 102 m wide from one tower position — the largest single-set-up footprint TRUEMAX offers. That is what lets it pour very large floor plates and rafts without relocating.

How does it reach its height — does it climb a structure?

It self-erects rather than climbing a structure. A telescopic cage with its own pump and cylinder raises the tower and inserts additional 2 × 2 m L68A1 mast sections, so the tower grows to its 46 m free-standing height and beyond when tied into an adjacent structure — like a tower crane building its own mast.

What does the “E” mean, and why does it matter on this size?

The “E” is electro-hydraulic proportional control. On a boom with a 21.5 m first section reaching 51 m, proportional control is what keeps the long arm's movements smooth and free of shock, giving precise, stable placing at full extension.

Is the placing boom a concrete pump?

No — it places concrete, it does not pump it. A separate stationary or line concrete pump lifts concrete up a riser run up the mast, and the PB51AT-4R-E distributes it across the area from the top of the tower. The pump supplies; the tower boom places.

How heavy is it, and what does erection involve?

Total weight is 66,000 kg including the mast, the most in the range, and the heaviest single lifting unit during erection is 14,800 kg, which sizes the assembly crane. It also needs a foundation engineered for the tower's loads. We support the foundation design and commissioning as part of supply.

What is included, and how is it delivered?

The package is the boom, the heavy-duty lattice mast (2 × 2 m base and L68A1 sections), the telescopic cage and lifting mechanism, the hydraulic and control system and the radio remote. Foundation design, delivery line, hose, spares, installation and commissioning are configured to your project and quoted separately. Send your reach, height and site loads and we will confirm the mast configuration.

The flagship of the TRUEMAX placing-boom range

The PB51AT-4R-E sits at the very top of the TRUEMAX placing-boom line — the largest reach (51 m) and greatest free-standing height (46 m) of any model, climbing or free-standing. It is one of two lattice tower booms: the PB38BT-4R-E covers large pours at 38 m and 40 m on a lighter mast, while the PB51AT-4R-E is reserved for the biggest and tallest structures on its heavy-duty 2 × 2 m mast. If a project's reach or height exceeds what every other TRUEMAX boom can give, this is the model built for it.

How a tower placing boom works with a pump

Like all placing booms, the PB51AT-4R-E places rather than pumps. Concrete moves from the batching plant by truck mixer to a stationary or line pump, which drives it up a riser run up the 46 m mast to the boom. From the top, the four-section boom distributes the concrete across a 51 m radius under electro-proportional control, so one operator covers a vast area by remote while the pump keeps concrete flowing. On the largest pours, this pairing places concrete where no shorter or ground-set boom could reach.

When you need the largest free-standing boom

Most projects are served by a climbing, spider, mobile or smaller tower boom. The PB51AT-4R-E answers the cases that are not: a structure so large or tall that the boom must be free-standing and reach both farther and higher than any other model — a major tower, a vast raft, a large dam or pier. Its size brings a bigger crane and foundation, so it is specified when the scale of the work genuinely requires the maximum reach and height TRUEMAX builds. For anything smaller, a lighter boom is the better-matched choice.