Painted Light Gray Steel Structure Bridge/prefabricated Steel Bridge

To effectively prevent algae growth on Bailey bridges, you can adopt a combination of physical, biological, and chemical methods. Here are some practical tips based on recent research and guidelines:

Physical Methods
1. **Shade and Sunlight Reduction**:
- Algae require sunlight to grow, so reducing direct sunlight exposure can help. This can be achieved by planting trees or installing shade cloth over the bridge surfaces.

2. **Water Movement and Aeration**:
- Increasing water movement and aeration can inhibit algae growth by preventing stagnant conditions. Installing aeration systems or water circulators can help.

3. **Regular Cleaning**:
- Regularly clean the bridge surfaces to remove any initial signs of algae growth. High-pressure washing can be effective, but avoid damaging the galvanized coating.

Biological Methods
1. **Beneficial Organisms**:
- Introducing beneficial bacteria or enzymes that decompose algae can help reduce growth. These organisms consume nutrients that algae need to thrive.

2. **Aquatic Plants**:
- Submerged aquatic plants can compete with algae for nutrients and light. They also provide a habitat for algae-eating zooplankton like Daphnia.

3. **Fish and Zooplankton**:
- Certain fish species, such as grass carp or silver carp, can help control algae by feeding on it. Zooplankton like Daphnia can also be effective in consuming small algae.

Chemical Methods
1. **Algaecides**:
- Copper-based algaecides or peroxide-based treatments can be effective in controlling algae growth. However, be cautious of potential environmental impacts and follow local regulations.

2. **Nutrient Control**:
- Using chemicals like iron chloride (FeCl) or aluminum products to fix phosphorus in the water can reduce nutrient availability for algae.

Additional Tips
- **Straw Bales**: Submerging straw bales in water can release natural compounds that inhibit algae growth. This method is environmentally friendly and can be effective over time.
- **Regular Monitoring**: Continuously monitor the bridge surfaces and water conditions to detect algae growth early. This allows for timely intervention before the problem becomes severe.

By combining these methods, you can effectively manage and prevent algae growth on Bailey bridges, ensuring their longevity and safety.

Specifications:

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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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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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​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