Steel Structure Trestle Prefabricated Trail Bridge Highway Steel Bridge

Steel Structure Trestle Bridge/prefabricated Highway Steel Bridge

Hot-dip galvanization significantly enhances the durability of Bailey bridges by providing several key benefits:

1. **Metallurgical Bond and Bond Strength**:

  The galvanizing process creates a strong metallurgical bond between the zinc coating and the steel, resulting in a bond strength of approximately 3,600 psi. This bond ensures that the coating becomes an integral part of the steel, rather than just a surface treatment, providing long-lasting protection against corrosion.

2. **Uniform Protection and Complete Coverage**:

  The galvanized coating grows evenly across the entire surface of the steel, including edges and corners, ensuring uniform protection. This uniformity is crucial for maintaining the structural integrity of the bridge, especially in harsh environments.

3. **Abrasion Resistance**:

  The galvanized coating consists of hard intermetallic layers (Gamma, Delta, and Zeta) that are harder than the underlying steel. These layers provide exceptional resistance to abrasion and impact, protecting the steel from damage during transportation, installation, and service.

4. **Predictable Coating Thickness**:

  The thickness of the galvanized coating is directly proportional to the thickness of the steel being galvanized. This predictability ensures consistent protection and helps in estimating the service life of the bridge components.

5. **Long-Term Corrosion Protection**:

  The galvanized coating provides long-term corrosion protection, with the corrosion rate slowing down over time. In some cases, the coating can last up to 40 years before requiring maintenance.

6. **Environmental Resistance**:

  Hot-dip galvanized steel can withstand continuous exposure to temperatures up to 20°C and occasional excursions up to 275°C without affecting the coating. This makes it suitable for various environmental conditions, including marine and industrial atmospheres.

By using hot-dip galvanization, Bailey bridges manufactured by Jiangsu Zhonghai Bridge Equipment Co., Ltd. achieve enhanced durability, ensuring they can withstand harsh conditions and heavy loads while maintaining a long service life.

Specifications:

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CB200 Truss Press Limited Table
NO.	Internal Force	Structure Form
		Not Reinforced Model				Reinforced Model
		SS	DS	TS	QS	SSR	DSR	TSR	QSR
200	Standard Truss Moment(kN.m)	1034.3	2027.2	2978.8	3930.3	2165.4	4244.2	6236.4	8228.6
200	Standard Truss Shear (kN)	222.1	435.3	639.6	843.9	222.1	435.3	639.6	843.9
201	High Bending Truss Moment(kN.m)	1593.2	3122.8	4585.5	6054.3	3335.8	6538.2	9607.1	12676.1
202	High Bending Truss Shear(kN)	348	696	1044	1392	348	696	1044	1392
203	Shear Force of Super High Shear Truss(kN)	509.8	999.2	1468.2	1937.2	509.8	999.2	1468.2	1937.2

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CB200 Table of Geometric Characteristics of Truss Bridge(Half Bridge)
Structure	Geometric Characteristics
	Geometric Characteristics	Chord Area(cm2)	Section Properties(cm3)	Moment of Inertia(cm4)
ss	SS	25.48	5437	580174
	SSR	50.96	10875	1160348
DS	DS	50.96	10875	1160348
	DSR1	76.44	16312	1740522
	DSR2	101.92	21750	2320696
TS	TS	76.44	16312	1740522
	TSR2	127.4	27185	2900870
	TSR3	152.88	32625	3481044
QS	QS	101.92	21750	2320696
	QSR3	178.36	38059	4061218
	QSR4	203.84	43500	4641392

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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

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Advantage

Possessing the features of simple structure,
convenient transport, speedy erection
easy disassembling,
heavy loading capacity,
great stability and long fatigue life
being capable of an alternative span, loading capacity