Road construction truck cranes divide into two practical bands: 1-16 t folding boom models on standard Foton or similar 4x2/6x4 chassis (described in Chinese market as 随车吊) for pipe-lifting, formwork and small precast work, and 25-160 t hydraulic telescopic mobile truck cranes (STC500S-class and above) for bridge girder erection and structural steel lifts [S5][S10].
For lifting capacity below 16 t, a Foton-derived truck crane uses a Class II (二类) automotive chassis with sub-frame, telescopic boom, hoist, luffing, and slewing mechanisms forming the upper structure; lifting capacity scales with chassis GVW and the crane's outrigger (支腿) envelope [S10]. 25-70 t models from Zoomlion-class OEMs are commonly quoted at FOB US $82,000-115,000 per unit (Evangel Industrial, Shanghai, listed 2026-08-08) [S5].
Selection by lifting class and road-build task
Truck crane selection for road construction is anchored to the heaviest single lift on the project schedule, not the average cycle weight, with 1-5 t units handling drainage pipe, kerb stone, and rebar cage work, 8-16 t units handling formwork panels and small precast beams, 25-50 t units handling bridge girders up to roughly 30 m span, and 70-160 t units handling full-span precast box girders and steel truss segments [S5][S8][S10].
On paved haul roads, a truck-mounted crane is preferred over a crawler crane because it can self-deploy between span sites at 60-80 km/h without a low-loader escort, which directly cuts mobilization cost on linear road jobs [S8]. Telescopic boom mobile cranes in the 50 t class (e.g. STC500S) are described as fully hydraulic with a 50 t maximum rated capacity and are applied to industrial, mining, and infrastructure lifting and installation [S5][S9].
Chassis, axle load, and road-legal constraints
Chassis selection on the 1-16 t class is dominated by Foton (福田) and similar Chinese OEM Class II (二类) platforms, with half-cab (半驾) and full-cab (全驾) variants; load capacity, stability, and off-road capability are the three primary engineering concerns for outdoor road-site hoisting [S10]. Gross vehicle weight and per-axle load must stay within the local road administration's limits, since a 50 t mobile truck crane with counterweight typically exceeds 40 t total rig weight and is often restricted to permit-escorted moves on public roads [S5].
For lighter utility cranes on standard 4x2 chassis, axle load rarely exceeds 18 t GVW, which keeps the unit within normal commercial-vehicle registration and removes the need for a special transport permit. For 50 t telescopic units, the practical decision is whether to buy new (FOB $82,000-115,000 per unit, as quoted for Zoomlion 25-50 t class on 2026-08-08) or pursue a used Terex-class unit, with Terex truck-mounted cranes explicitly described as mobile lifting machines on truck carriers for fast transport between jobsites [S5][S8].
Outriggers, boom length, and reach envelope
Outrigger span (支腿跨距) is the practical stability governor on road-site lifts where ground is often soft shoulder or temporary cribbing; a wider span directly multiplies the rated lift chart at any given radius. Boom length drives the working radius envelope: 8-16 t folding-boom truck cranes typically work at 8-14 m radius for pipe placement, while 50 t telescopic units work at 14-32 m radius for bridge girder erection. [S9]
For bridge-beam erection on a road job, the practical envelope is 25-50 t lifting capacity with a 4-section telescopic boom at 38-44 m main boom length, giving roughly 28-32 m radius at 1.5 t chart load. Buyers shopping Terex truck cranes in this size band are specifically looking for "road mobility, jobsite versatility, and lifting performance in demanding field conditions" per the manufacturer's used-equipment listing language (2026-07-06) [S8].
Power, hydraulics, and operator interface
Hydraulic telescopic mobile cranes in the 50 t STC500S class are described as fully hydraulic, with the maximum rated lifting capacity at 50 t and a multi-section telescoping boom driven by a single double-acting cylinder plus wire-rope synchronisation [S9]. Lifting and luffing winches are hydraulically driven, and the upper structure (上装) integrates the slewing platform, operator cab, and counterweight, all bolted to the truck carrier's sub-frame [S10].
For 1-16 t truck-mounted cranes on Foton or similar Class II chassis, domestic Chinese brand crane upper-structures named in 2026 market data include Hunan Zhongtian, XCMG, Shimei (石煤), Shaoguan, Mudanjiang, and Zoomlion [S10]. The boom typically carries a 1-3 section telescopic arm, and the operator console combines a hydraulic control valve stack with a load moment indicator (LMI), mandatory under most jurisdictions for lifts above 8 t capacity. Side mention: on a road project, the same yard that hosts the crane typically also runs a dump truck fleet for earthwork, and the maintenance crew will standardise hydraulic hose, filter, and LMI spares across both fleets to keep inventory lean.
Total-cost comparison: new vs used, and 25-50 t class
Within the 25-50 t mobile truck crane class, the spread of quotes is wide: Evangel Industrial (Shanghai) lists Zoomlion 25-70 t hydraulic mobile cranes at FOB US $82,000-115,000 per piece with a 1-piece minimum order, valid as of 2026-08-08 [S5]. Okorder's separate listing for a "Truck Crane for Construction, 50 t" with 100 unit/month supply capability and Tianjin loading port corroborates that 50 t units are standard stock items for OEM export channels [S9].
For road builders running a 12-24 month export-equipment program (as posted by a France-based buyer in the 2026-07-15 verified lead, sourcing Caterpillar D6R2/D8R2 dozers, 336DL/330DL excavators, and 432F2/444F2 backhoe loaders, payment via irrevocable confirmed LC at sight), the 25-50 t truck crane typically pairs with a reach truck or warehouse-scale yard support vehicle on the bid line, and the all-in landed cost is roughly 1.15-1.30x the FOB figure once insurance, freight, and commissioning are added. Used Terex truck cranes reduce unit price but add age-related risk on boom-pin wear, slewing bearing play, and LMI calibration certificates.
Who a truck crane is for, and who it is not
A truck crane is the right pick for road projects where the lift count is 5-15 per day, the longest radius is under 32 m, and the haul road between span sites is paved or well-maintained. It is the wrong pick for soft-ground sites with no cribbing mat, for lifts over 160 t on long-span bridge piers, and for any job where the route passes under a low bridge or weight-restricted overpass that the carrier height cannot clear. [S8]
For ground compaction work immediately adjacent to the crane pad, road crews typically pair a road roller on the same schedule so finished subgrade is ready when crane outriggers land. For weighbridge and batching-plant integration on a paved road job, the contractor's truck scale and the crane's outrigger-pad load cell are the two instruments that prevent the most common field failure: differential settlement during a lift.
Standards, sourcing, and a 2026 field signal
For European-bound road projects, the buyer lead posted on 2026-07-15 specifies "irrevocable, confirmed Letter of Credit at sight, confirmed by a European bank" with "demand steady and may continue for 12 to 24 months" for the full equipment package including crawler dozers, hydraulic excavators, and backhoe loaders (HS codes 84295200, 84291100, 84304190) [S2]. Chinese OEM trading companies in Shanghai, including Evangel Industrial (Changning District, 201103) and Anyang Kaige Machinery, are active in the 25-50 t hydraulic mobile crane export channel on 2026-08-08 [S5][S6].
Field signal to track: the 50 t STC500S-class hydraulic mobile truck crane is the inflection point for road-bridge work, while the 25 t class is the practical minimum for full-span precast girder lifts on a 20-30 m span bridge. For adjacent work-zone access, road contractors often spec an aerial work truck alongside the crane for sign-gantry and lighting-column installation, keeping both fleets on the same operator-certification regime. Reference: Forklift selection for pipeline construction sites: 2026 spec and powertrain map covers a sister logistics decision (chassis, mast, axle) that often shows up in the same yard.
