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CB200
ZHONGHAI
ZHQL-CB200
Railroad trestle bridges are specialized elevated structures designed exclusively to support railroad tracks, enabling trains to cross challenging terrain—such as deep valleys, wetlands, rivers, or uneven landscapes—where ground-level tracks are impractical. Unlike standard road trestles, these bridges prioritize the heavy loads and consistent stability required for rail traffic, making them critical components of railway networks worldwide, from rural freight routes to industrial corridors.
The defining feature of a railroad trestle bridge is its robust framework. Typically constructed from steel (for modern designs) or treated timber (for historical or low-traffic routes), the structure consists of vertical supports (called bents) spaced evenly along the crossing path. These bents—made of thick steel beams or reinforced wooden posts—rest on stable foundations (concrete footings or bedrock) to bear the immense weight of trains. Horizontal stringers connect the bents, and heavy-duty steel rails are secured to these stringers, creating a level, rigid surface for train wheels. Steel is the preferred material for high-traffic or heavy-freight lines: it resists corrosion (with galvanized coatings), withstands repeated dynamic loads, and requires minimal maintenance compared to timber.
Railroad trestle bridges excel at spanning large gaps without disrupting the terrain below. For example, a trestle crossing a deep valley can reach heights of 100 meters or more, using tall bents to elevate tracks while leaving the valley floor undisturbed—critical for preserving ecosystems or avoiding costly ground excavation. Over wetlands or marshes, their narrow footprint minimizes damage to fragile habitats, as the bents only occupy small areas of land, unlike wide embankments that would displace wildlife.
Safety and durability are non-negotiable in their design. The bents and stringers are engineered to handle loads of up to 10,000 tons (for freight trains), with extra bracing to resist lateral forces from strong winds or train momentum. Regular inspections—including checks for steel fatigue or timber rot—ensure the bridge remains safe for decades; many steel railroad trestles have lifespans exceeding 70 years.
While modern railway projects sometimes use tunnels or viaducts, railroad trestle bridges remain a cost-effective and practical choice for specific terrains. They balance strength, adaptability, and minimal environmental impact, ensuring trains can move efficiently and safely across even the most challenging landscapes—keeping freight, passengers, and industrial supply chains connected.
| CB321(100) Truss Press Limited Table | |||||||||
| No. | Lnternal Force | Structure Form | |||||||
| Not Reinforced Model | Reinforced Model | ||||||||
| SS | DS | TS | DDR | SSR | DSR | TSR | DDR | ||
| 321(100) | Standard Truss Moment(kN.m) | 788.2 | 1576.4 | 2246.4 | 3265.4 | 1687.5 | 3375 | 4809.4 | 6750 |
| 321(100) | Standard Truss Shear (kN) | 245.2 | 490.5 | 698.9 | 490.5 | 245.2 | 490.5 | 698.9 | 490.5 |
| 321 (100) Table of geometric characteristics of truss bridge(Half bridge) | |||||||||
| Type No. | Geometric Characteristics | Structure Form | |||||||
| Not Reinforced Model | Reinforced Model | ||||||||
| SS | DS | TS | DDR | SSR | DSR | TSR | DDR | ||
| 321(100) | Section properties(cm3) | 3578.5 | 7157.1 | 10735.6 | 14817.9 | 7699.1 | 15398.3 | 23097.4 | 30641.7 |
| 321(100) | Moment of inertia(cm4) | 250497.2 | 500994.4 | 751491.6 | 2148588.8 | 577434.4 | 1154868.8 | 1732303.2 | 4596255.2 |
