Steel Panel Bridge/temporary Steel Panel Bridge

Using zinc-rich primer coatings on steel bridges offers several significant benefits that enhance durability, reduce maintenance, and provide long-term protection against corrosion:

1. **Cathodic Protection**
Zinc-rich primers provide cathodic protection due to their high zinc content (typically 60-90%). Zinc acts as a sacrificial anode, corroding preferentially over the steel. This means that even if the coating is breached, the underlying steel remains protected from corrosion.

2. **Barrier Protection**
The epoxy resin in zinc-rich primers forms a tight, impermeable barrier over the steel surface. This barrier physically blocks water, oxygen, and other corrosive elements from reaching the steel, significantly reducing the risk of rust and corrosion.

3. **Long-Term Durability**
Zinc-rich primers offer long-term protection by combining both cathodic and barrier protection mechanisms. This dual protection extends the lifespan of steel structures, reducing the need for frequent maintenance and replacements.

4. **Versatility and Adaptability**
These primers are highly versatile and can be used in a wide range of environments, from marine settings to industrial facilities. They are particularly effective in harsh conditions where steel is exposed to salt spray, high humidity, and industrial chemicals.

5. **Cost-Effectiveness**
By prolonging the lifespan of steel structures and reducing maintenance needs, zinc-rich primers offer substantial cost savings over time. The initial investment in high-quality coatings pays off through reduced maintenance and longer service life.

6. **Reduced Maintenance**
Zinc-rich primers continue to protect the steel even if the topcoat is breached, making them a superior choice for long-term corrosion resistance. This reduces the frequency of maintenance and the associated costs.

7. **Chemical Resistance**
The epoxy resin component in zinc-rich primers provides additional chemical resistance, further aiding in preventing rust-inducing reactions with other chemicals.

8. **Self-Healing Properties**
Some advanced zinc-rich primers incorporate conductive polymers or other additives that enhance their self-healing properties. These materials can rebuild the protective layer if it is damaged, ensuring continuous protection.

Conclusion
Zinc-rich primer coatings are a highly effective solution for protecting steel bridges from corrosion. Their combination of cathodic and barrier protection, long-term durability, and cost-effectiveness make them an ideal choice for ensuring the longevity and reliability of steel structures.

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