General Specifications of Four-Axle Low-Chassis Transportation Semi-Trailers

1. Dimensions

Overall External Dimensions (varies by load type: flat-deck vs. drop-deck):

Flat-deck model (for wide/long cargo): 15.0–18.0 m (L) × 2.55–3.0 m (W) × 1.4–1.8 m (H, total height; includes low chassis + basic flat deck)

Drop-deck model (for ultra-tall cargo): 16.0–20.0 m (L) × 2.55–3.0 m (W) × 1.2–1.6 m (H, total height; recessed deck reduces overall height)

Core Low-Chassis Height:

Chassis frame height (ground to main rail top): 0.6–1.0 m (20–40% lower than standard semi-trailers; key for avoiding height limits)

Deck height (ground to cargo surface): 0.8–1.2 m (flat-deck); 0.6–0.9 m (drop-deck recessed section)

Deck Dimensions:

Flat-deck: 14.5–17.5 m (L) × 2.55–2.8 m (W) (clear loading area)

Drop-deck: Main deck (10.0–14.0 m L × 2.55 m W) + recessed section (4.0–6.0 m L × 2.55 m W; 0.3–0.5 m deeper than main deck)

2. Load Capacity

Tare Weight (Empty Weight):

Flat-deck model: 11,000–13,500 kg (uses high-strength steel to balance low weight and heavy load)

Drop-deck model: 12,500–15,000 kg (extra structure for recessed deck adds slight weight)

Gross Vehicle Weight Rating (GVWR):

Standard: 48,000–60,000 kg (complies with most regional heavy-duty limits; e.g., China's 4-axle total weight limit of 49,000 kg)

Heavy-duty (for mining/construction): Up to 72,000 kg (with reinforced axles and frame)

Payload Capacity:

Standard: 34,500–46,500 kg (flat-deck); 33,000–45,000 kg (drop-deck)

Axle Load Distribution: 12,000–15,000 kg per axle (evenly distributed to meet road load limits; e.g., EU's 11,500 kg/axle for 4-axle trailers)

3. Chassis & Frame Design

Frame Material:

Main Rails: High-tensile steel (Q690 or S690) – 16–20 mm thickness; height reduced to 200–250 mm (vs. 300–350 mm for standard semi-trailers)

Cross Beams: 120×80×6 mm steel channels; spaced 0.4–0.6 m apart (enhances deck rigidity for unevenly distributed heavy cargo)

Low-Chassis Realization:

Shortened suspension brackets (reduces distance between axle and frame)

Low-profile main rails (no extra height for auxiliary components)

Optional drop-deck structure (recessed central section via stepped frame rails)

Reinforcement:

Deck reinforcement: 8–10 mm thick steel plates (added under deck for high-load zones, e.g., where heavy machinery wheels rest)

Frame end reinforcement: 20–25 mm thick steel plates (protects frame from impact during loading/unloading)

4. Axle & Suspension System

Axle Configuration:

4 axles total: 2 fixed axles (front) + 2 self-steering axles (rear) (self-steering reduces turning radius for narrow construction sites/roads)

Axle Type: Heavy-duty solid steel axles (rated load: 12,000–15,000 kg/axle; brands: BPW, SAF-Holland, or CIMC)

Suspension System:

Primary: Height-adjustable air suspension (standard for low-chassis trailers; adjustable range: ±0.15 m – critical for aligning deck height with loading ramps)

Damping: Double-acting hydraulic shock absorbers (reduces vibration to protect fragile cargo like precision machinery)

Braking System:

Service Brakes: Disc brakes (all axles; better heat dissipation for long downhill hauls with heavy cargo)

Safety Systems: ABS (Anti-lock Braking System) + EBS (Electronic Braking System) + ASR (Anti-Slip Regulation) (meets EU ECE R13, US FMVSS 121)

Parking Brake: Spring-actuated mechanical brakes (acts on all 4 axles for secure parking on slopes)

5. Loading & Securing Features

Loading Aids:

Hydraulic Support Legs: 4–6 units (2 front + 2–4 rear); load capacity: 20,000 kg/leg; adjustable height: 0.5–1.5 m (stabilizes trailer during loading/unloading)

Detachable Ramps: 2 units (length: 3.0–4.0 m, width: 0.6–0.8 m); made of 12 mm thick wear-resistant steel (for drive-on/drive-off of wheeled machinery)

Cargo Securing:

Tie-Down Points: 24–32 D-rings (rated load: 8,000–10,000 kg each); distributed along deck edges and cross beams (for securing cargo with chains/straps)

Lashing Rails: 2–4 side rails (mounted on deck edges; compatible with adjustable lashing belts for irregularly shaped cargo)

Deck Surface: Optional anti-slip coating (rubber or diamond-patterned steel) – prevents cargo sliding during transport (critical for wet/icy conditions)

6. Tires & Wheels

Tire Specifications:

Size: Low-profile, small-diameter tires (19.5R22.5, 225/75R17.5, or 245/70R19.5) – key for minimizing chassis height

Load Rating: 4,500–5,500 kg per tire (matches axle load capacity; 16PR or 18PR)

Type: Radial tires with deep tread (18–22 mm depth) – suitable for on-road transport and light off-road (e.g., construction site gravel roads)

Wheel Rims:

Material: Lightweight aluminum alloy (standard; reduces tare weight) or heavy-duty steel (optional for off-road use)

Size: 17.5 in or 19.5 in (matches tire diameter); 8–10 bolt holes (secure attachment to axles)

7. Safety & Compliance

Safety Devices:

High-visibility reflective strips (full-body coverage, including front/rear/side) + LED marker lights (amber side lights, red rear lights)

Emergency stop valve (mounted on rear; cuts off hydraulic/suspension power in case of malfunction)

Side guard rails (height: 0.5 m; prevents pedestrians/objects from getting under the trailer)

Certifications:

Regional: CE (Europe), DOT (North America), CCC (China), VIN (Vehicle Identification Number) for global tracking

Industry: ISO 3833 (commercial vehicle classification), ISO 11992 (trailer coupling standards)

8. Customization Options

Deck Modifications: Extended deck length (up to 25 m for wind turbine blades), extra-wide deck (up to 3.5 m for oversize steel structures), or multiple recessed sections (for multi-piece tall cargo)

Functional Upgrades:

Remote-controlled suspension height adjustment (for one-person loading operation)

Winches (15–20 ton capacity; for pulling non-wheeled cargo onto the deck)

Temperature sensors (for transporting temperature-sensitive machinery)

Off-Road Adaptations: Reinforced mud flaps, all-terrain tires (for mining/remote construction sites), or additional undercarriage protection (steel plates to prevent damage from rocks)

Product Introduction

This 18m Four-Axle Low-Chassis Transportation Semi-Trailer for Heavy Oversized Cargo is a specialized solution engineered for transporting ultra-tall, wide, or heavy 大件 goods-such as engineering machinery (shield machines, road rollers), wind power tower sections, and prefabricated steel structures. Its core advantage lies in the low-chassis design (0.6–1.0m chassis height) and four-axle configuration, which not only avoids exceeding road height limits but also ensures stable load-bearing (up to 60,000kg GVWR) for heavy cargo. Equipped with height-adjustable air suspension and self-steering rear axles, it balances maneuverability on narrow roads and safety during long-haul transport, complying with global standards (EU ECE R13, US FMVSS 121, China GB 1589). It is an ideal choice for heavy equipment logistics companies, wind power project contractors, and construction enterprises.

Product Content Introduction

18m Four-Axle Low-Chassis Transportation Semi-Trailer for Heavy Oversized Cargo features a precision low-chassis and flat-deck design optimized for oversized cargo. Its main frame uses 250×150×18mm high-tensile Q690 steel rails, with a chassis height of just 0.8m (ground to main rail top)-reducing the overall cargo transport height by 30% compared to standard semi-trailers, effectively avoiding "oversized" violations for ultra-tall goods (e.g., 3.5m tall wind power nacelles). The 18m-long flat deck (17.5m effective loading length × 2.8m width) is made of 10mm-thick Hardox 450 wear-resistant steel, with an optional diamond-patterned anti-slip coating-preventing cargo sliding during transport and withstanding abrasion from heavy machinery tracks.

18m Four-Axle Low-Chassis Transportation Semi-Trailer for Heavy Oversized Cargo delivers exceptional load-bearing capacity supported by a balanced four-axle system. It has a tare weight of 13,000kg, a gross vehicle weight rating (GVWR) of 60,000kg, and a payload capacity of 47,000kg-enough to carry a single 45-ton medium-sized shield machine or two 20-ton wind power tower sections. The four axles (each rated 15,000kg, brand: SAF-Holland) adopt an even load distribution design, with the rear two axles being self-steering-reducing the turning radius by 25% compared to fixed-axle models, making it easy to navigate narrow construction site roads or urban intersections.

18m Four-Axle Low-Chassis Transportation Semi-Trailer for Heavy Oversized Cargo is equipped with a high-performance suspension and braking system for safe, stable transport. It uses height-adjustable air suspension (adjustable range: ±0.15m) that can be remotely controlled to align the deck with loading ramps-eliminating the need for extra lifting equipment when loading wheeled machinery. The braking system includes full-disc brakes (all four axles) with ABS (Anti-lock Braking System), EBS (Electronic Braking System), and ASR (Anti-Slip Regulation)-ensuring reliable stopping even when fully loaded (60,000kg) during long downhill runs (e.g., mountainous highways).

18m Four-Axle Low-Chassis Transportation Semi-Trailer for Heavy Oversized Cargo comes with practical loading aids and cargo-securing features to simplify operations. It is fitted with 6 hydraulic support legs (2 front + 4 rear, each with a 20,000kg load capacity) that stabilize the trailer during loading/unloading, preventing tilting under heavy cargo. Two detachable steel ramps (3.5m long × 0.7m wide, 12mm thick) are included for drive-on/drive-off of wheeled equipment like loaders. Additionally, 32 D-ring tie-down points (each rated 10,000kg) are distributed along the deck edges and cross beams-allowing secure fixation of irregularly shaped cargo (e.g., steel structures) with heavy-duty chains.

18m Four-Axle Low-Chassis Transportation Semi-Trailer for Heavy Oversized Cargo meets global compliance requirements and supports tailored customization. It holds CE (Europe), DOT (North America), and CCC (China) certifications, ensuring legal registration and operation in major markets. Customization options include: an extended 20m deck (for extra-long wind turbine blades), an extra-wide 3.2m deck (for oversize prefabricated concrete components), a 20-ton winch (for pulling non-wheeled cargo onto the deck), and all-terrain tires (for mining or remote construction site transport). For cold regions, heated air suspension components are available to prevent freezing in low temperatures.

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