Home > PB17B-3R-II Spider Concrete Placing Boom — 17 m

PB17B-3R-II Spider Concrete Placing Boom — 17 m

The PB17B-3R-II is a mobile spider concrete placing boom designed for horizontal concrete distribution across expansive slabs and decks. It operates from a free-standing, inclined-outrigger base without requiring structural anchorage. The unit provides a 17 m placement radius through a 3-section R-fold articulating boom. Operating on a 380V/50Hz electrical supply with a 5.5 kW motor, the system is fully hydraulic and utilizes a 25 MPa hydraulic circuit. The total operational weight is 6,500 kg, with the maximum single lifting unit restricted to 1,520 kg, enabling rapid relocation by standard site tower cranes.

The boom features a continuous 360° slewing range driven by a self-locking turbo worm gear mechanism, which maintains angular stability during placement operations. Functioning as the terminal distribution unit, it integrates with a separate stationary or truck-mounted line pump via a delivery pipeline to distribute concrete at the designated pour location.

1. Inclined-outrigger base — Deploys on a splayed-leg structure to maintain stability on flat surfaces without requiring structural anchoring.

2. Optimized weight distribution — With a total weight of 6,500 kg and a maximum lifting unit of 1,520 kg, the boom minimizes required crane capacity for relocation.

3. 3-Section R-Fold articulation — Fully hydraulic articulation provides a 17 m placement radius and folds compactly for crane handling.

4. Continuous 360° slewing — Provides full-circle rotational coverage from a single setup position.

5. Turbo worm gear drive — Utilizes a self-locking worm-gear mechanism to maintain angular stability and prevent boom drift under load.

6. Dual remote control systems — Operations are managed via wireless radio remote or cable remote control to maintain direct visual contact with the pour.

7. Compact 17 m envelope — Designed for systematic bay-by-bay placement requiring frequent equipment relocation.

8. Standardized components — The hydraulic and electrical systems incorporate components from established suppliers to ensure operational stability.

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Technial Parameters

Item	Unit	PB17B-3R-II
Performance
Max. Radius of Placing Boom	m	17
Free-Standing Height (to boom root joint)	m	2.7
Slewing Range	/	360°
Mode of Slewing	/	Turbo Worm Drive
Application Scenario	/	Mobile (Spider)
Circumstance Temperature	℃	-20 ~ 55
Power Supply (customisable)	/	380V / 50Hz
Boom (3-Section R-Fold)
1st Section — Length	m	7.1
1st Section — Articulation	°	0 ~ 85
2nd Section — Length	m	5.5
2nd Section — Articulation	°	0 ~ 180
3rd Section — Length	m	4.5
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	5.5
Hydraulic Pressure	MPa	25
Hydraulic Oil (5℃–55℃)	/	HM46 anti-wear
Hydraulic Oil (-20℃–5℃)	/	HM32 anti-wear
Weight
Total Weight	kg	6500
Max. Lifting Unit	kg	1520

Dimensions & Working Range

The working-range diagram shows the 17 m radius swept through 360° from the boom's set-up position, plus the vertical fold of the three arms. The 2.7 m free-standing height and the outrigger footprint determine where the boom can be set down on a slab; relocate it by crane to extend coverage across a larger floor. Read the diagram with the outrigger-base dimensions to plan set-up points.

Applications

The PB17B-3R-II is engineered for applications requiring extensive horizontal concrete distribution where the placement equipment must be frequently relocated across the site.

Floor slabs and decks

Facilitates concrete placement across suspended slabs and decks by completing sequential 17 m radius pours and relocating via crane without fixed installations.

Podiums and transfer slabs

Supports the construction of podium decks and transfer slabs requiring phased concrete distribution across distinct pour zones.

Foundations and rafts

Applies to raft foundations and ground slabs, providing uniform concrete spread while eliminating manual hose handling.

Sites utilizing tower cranes

Integrates with existing site tower cranes, utilizing the 1,520 kg maximum lift unit weight to enable repositioning without dedicated handling equipment.

FAQs

What is a spider placing boom?

A spider placing boom is a free-standing, relocatable distribution unit supported by an inclined-outrigger base. It requires no structural anchorage. The unit is positioned on the slab to place concrete within its operational radius and is subsequently relocated by a crane. The PB17B-3R-II represents the 17 m mobile spider model in the series.

How is it moved around the site?

The unit is relocated using a site tower crane or mobile crane. The total weight is 6,500 kg, and the modular design restricts the maximum single lifting unit to 1,520 kg, ensuring compatibility with standard crane lifting capacities.

How does it differ from a climbing placing boom?

A climbing boom attaches directly to the building structure or formwork and ascends vertically as construction progresses. A spider boom, such as the PB17B-3R-II, operates on a single horizontal plane, distributes concrete across a specific area, and is lifted laterally to subsequent pour zones. Spider booms are specified for horizontal slab coverage, whereas climbing booms are deployed for vertical core and wall construction.

Is it the same as the wheeled PB17D-3R?

Both models provide a 17 m placement radius but utilize different mobility mechanisms. The PB17B-3R-II employs stationary outrigger legs and requires crane relocation. The PB17D-3R is mounted on a wheeled chassis, allowing it to be towed or rolled between positions. The selection depends on whether crane lifting or ground rolling is the preferred relocation method.

Is the placing boom a concrete pump?

No. The placing boom functions strictly as a concrete distributor. It requires a separate stationary or line concrete pump to drive material through a delivery pipeline to the boom's inlet.

Is it electric, and what are its weight specifications?

The unit is electrically driven, operating on a 380V/50Hz supply with a 5.5 kW motor. It does not feature an onboard diesel engine. The total operational weight is 6,500 kg, and the maximum single lifting unit is 1,520 kg.

What is supplied, and how is it shipped?

The standard configuration includes the boom, outrigger base, hydraulic and control systems, and remote controls. The delivery pipeline, hoses, and spare parts are specified according to project requirements.

Spider booms vs. climbing boom configurations

Concrete placing booms utilize different mounting and mobility mechanisms based on structural requirements. Spider booms, such as the PB17B-3R-II, are free-standing units designed for horizontal slab distribution and rely on site cranes for relocation. Climbing booms mount to structural cores or formwork, utilizing hydraulic cylinders to ascend synchronously with vertical construction. Spider booms are specified for expansive deck pours, whereas climbing configurations are deployed for high-rise cores.

System integration in concrete placement

In a standard placement sequence, concrete is pumped from ground level via a stationary or truck-mounted line pump through a delivery pipeline. The spider boom functions as the terminal distribution equipment. Operating from a fixed base, the PB17B-3R-II maneuvers its articulating arms to deposit concrete precisely, eliminating manual hose handling. Once the designated area is completed, the crane relocates the unit, and the pipeline is adjusted accordingly.

Configurations within the spider boom series

The mobile spider placing boom series includes two primary models: the 17 m PB17B-3R-II and the 21 m PB21B-3R. The PB17B-3R-II emphasizes portability, featuring a 1,520 kg maximum lifting unit and a self-locking turbo worm gear drive, optimized for frequent relocations. The PB21B-3R provides an extended 21 m radius and utilizes gear slewing for larger pour areas. Selection depends on the required coverage area per setup versus the frequency of repositioning.