Pained Or Galvanized Simple Bailey Bridge / Steel Truss Bridge 3.15m 4.2m 7.35m,10.5m

Chinese Bailey Bridge/simple Bailey Bridge

Advantages of Type 200 Bailey Bridge and Type 321 Bailey Bridge

Advantages of Type 200 Bailey Bridge

1. **Higher load-bearing capacity**:
- The truss height of Type 200 Bailey Bridge is 2.134 meters, which is higher than the 1.5 meters of Type 321, so it has higher load-bearing capacity and stiffness. Its strength is increased by 33% and its stiffness is increased by 2.3 times.
- In the case of large spans, the load-bearing capacity of Type 200 Bailey Bridge is significantly better than that of Type 321.

2. **Smaller deflection**:
- The Type 200 Bailey Bridge adopts a pre-arch design, which greatly reduces the vertical deflection in the mid-span of the bridge. For example, the non-reinforced double-row single-layer Type 200 steel bridge with a span of 21 meters has a mid-span vertical deflection of only 11.94 mm under the action of automobile-15 level load, which is much smaller than the allowable deflection value specified in the specification.

3. **Wider lanes**:
- The net width of a single lane of the 200-type Bailey bridge is 4.2 meters, which is wider than the 3.7 meters of the 321-type, making it easier for special vehicles to pass.

4. **Less steel usage**:
- At the same span, the 200-type Bailey bridge requires 30% less steel than the 321-type, thereby reducing the cost of the bridge.

5. **Higher overall stability**:
- The wind-resistant tie rods of the 200-type Bailey bridge are made into an integral type and connected to the crossbeam, which improves the overall stability of the steel bridge.

6. **Better connection accuracy**:
- The bolted connection components of the 200-type Bailey bridge adopt the method of positioning and fixing with a guide sleeve, which increases the connection accuracy and the service life of the bolts.

 Advantages of Type 321 Bailey Bridge

1. **Wide Applicability**:
- Type 321 Bailey Bridge is suitable for a variety of load levels, including car-10, car-15, car-20, crawler-50, trailer-80, etc.
- Its maximum span can reach 69 meters, and the roadway width is 3.7 meters, allowing wheeled vehicles to pass at 30 kilometers per hour and crawler vehicles to pass at 5 kilometers per hour.

2. **Lightweight components**:
- The components of Type 321 Bailey Bridge are light, easy to disassemble and assemble, and highly adaptable. They can be quickly built with simple tools and manpower.

3. **Quick Erection**:
 Type 321 Bailey Bridge has a fast erection speed, is suitable for emergency use, and can restore traffic in a short time.

4. **Economical**:
- Type 321 Bailey Bridge has fewer components, which is easy to assemble, disassemble, transport and store, reducing the cost of use.

Summary
The 200-type Bailey bridge has significant advantages in load-bearing capacity, stiffness, deflection control, steel usage and overall stability, and is suitable for scenarios with large spans and special load requirements. The 321-type Bailey bridge is particularly suitable for emergency rescue and the rapid construction of temporary bridges due to its wide applicability, lightweight components and rapid erection capabilities.

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