Straddle carriers for precast concrete

A precast yard is not a container terminal. The loads are longer, the lifting points change, the ground may be uneven and the product often has to be rotated or placed on a truck bed. A machine that works well for a 40 ft box may be completely wrong for a 30 m beam.

We configure straddle carriers around the precast product family: the beam or panel geometry, the lifting inserts, the yard route and the way the unit is stored and loaded.

Why precast handling is different

• Long loads: a beam can be 20–40 m long, so the machine needs a long portal or a multi-point frame.
• Lifting points: precast units often have cast-in inserts or slings at specific points; the frame has to match them.
• Edge protection: concrete edges chip or crack if the load twists or the slings bear on the wrong surface.
• Yard route: the machine may have to pass between casting beds, storage rows and the loading bay.
• Ground: precast yards are often semi-rough; wheel loads and tyre selection matter.

Loads we handle

Machine configuration

• Span and length: sized to the longest load plus safe clearance, not just the rated capacity.
• Lifting frame: two-point, four-point or custom saddles with adjustable positions.
• Hoists: synchronised or independent, with load monitoring and anti-sway.
• Steering: crab and four-way modes for placing long units in tight rows.
• Tyres and wheel count: selected for the yard surface and the loaded wheel load.
• Control: cab or remote, depending on visibility and the number of banksmen.

Yard and route planning

Before we size the machine, we ask for a plan of the precast yard: casting beds, storage rows, truck lane, turning areas and any overhead obstructions. The goal is to find a route that the loaded machine can actually use — not just an empty-machine route. The yard layout guide walks through that plan step by step.

• Minimum aisle width along the full route, including corners.
• Ground bearing capacity and slab joints.
• Clearance under conveyors, pipes and overhead lines.
• Storage height and the method of separating stacked units.
• Truck loading position and approach angle.

Safety and control

Precast loads are unforgiving. A twisting beam or a dropped panel is a serious incident. The machine package should include load monitoring, limit switches, anti-sway control and a clear lifting plan. Where the operator cannot see the load, remote control or a banksman procedure is used.

Matching the frame to the lifting inserts

Most precast problems start at the lifting points, not at the machine. Units carry cast-in anchors, wire loops or through-holes, and each type has a rated capacity and a permitted load direction. A frame that pulls at the wrong angle can overload an insert even when the total weight is well inside the machine's rating.

The frame is therefore designed around the insert pattern: the number of points, their spacing along the unit, and the angle the sling or shackle will sit at. Where the insert layout is not symmetrical, load sharing has to be controlled rather than assumed — equalising gear or load monitoring keeps one point from taking most of the weight.

• Slings at an angle introduce a horizontal component that pushes the lifting points together. A spreader beam keeps the legs closer to vertical and reduces that force.
• Long units need support at more than two points, or a frame that distributes load along the member instead of concentrating it at the ends.
• Thin panels are vulnerable to out-of-plane bending. The frame may need a rigid lifting beam rather than a simple two-leg sling.
• Concrete strength at lifting is set by the precast producer. The machine can only lift what the unit is ready to carry; stripping and lifting times belong in the producer's method statement.

Send the insert layout with the unit drawing. If the anchors are already cast and cannot move, the frame is designed around them; if the unit is still in design, there is usually a cheaper arrangement.

Loading, stacking and the truck interface

The last ten metres of the yard are often the hardest. A loaded carrier has to approach the truck or trailer square, lower the unit onto the deck without dragging it, and release the frame cleanly. Trailer deck height, suspension movement and the driver's position all affect how much control the operator needs at that moment.

Stacking has its own rules. Dunnage and separation timbers must sit under the support points the unit was designed for; placing them elsewhere introduces bending the unit was never checked for. Storage height is limited by the machine's lift height, by the stability of the stack and by what the yard can safely inspect.

• Keep the loaded route clear of casting beds, stressing operations and people on foot.
• Allow for the tail swing of a long unit in corners, not just the machine's turning radius.
• Check overhead clearance for the highest stack the machine will carry, not only for a single unit.
• Agree the truck loading position and approach angle before the yard layout is fixed.

Panels that have to be rotated after lifting need a tilting or rotating frame, and the machine's stability is then governed by the load's centre of gravity rather than its weight. That is a frame decision as much as a machine decision, and it is worth settling before the capacity and dimensions are fixed. The case library includes 35 t to 100 t precast builds that show how much the frame geometry can differ at similar tonnage.

Precast-related builds

These are examples from the documented case library. Project-specific details are shared during technical review where available.

35 t

35T concrete straddle carrier

General precast yard handling with a compact portal.

100 t

100T double-girder concrete straddle carrier

Heavy precast units with a double-girder frame.

85 t

85t precast beam straddle carrier

Long beam handling with multi-point lifting.

120 t

120T double-girder concrete RTG

Fixed-bay precast handling with a gantry configuration.

Precast FAQ

Last updated 24 October 2026 · Reviewed by the HSCRANE engineering team.