Emergency Bailey Bridge/bailey Emergency Bridge

The Type 321 Bailey Bridge is designed primarily for one-way traffic, with a standard carriageway width of 3.7 meters, suitable for loads such as car-10, car-15, car-20, track-50, and trailer-80. Although the one-way design of the Type 321 Bailey Bridge can meet a variety of load requirements, it has certain limitations in terms of multi-lane traffic requirements.

### Multi-lane adaptability of the Type 321 Bailey Bridge

- **Single lane design**: The standard design of the Type 321 Bailey Bridge is a single lane with a carriageway width of 3.7 meters. This design performs well in one-way traffic, but for multi-lane traffic requirements, additional design and modification are required.

- **Dual lane modification**: Although the Type 321 Bailey Bridge is primarily designed as a single lane, in some cases two-lane traffic can be achieved by splicing two sets of one-way bridges side by side. However, this modification needs to consider the load-bearing capacity and stability of the bridge to ensure that it can safely carry two-lane traffic.

- **Load capacity**: The 321 Bailey Bridge is capable of carrying a variety of load levels, including 500 kN for tracked loads and 300 kN for tires (130 kN for axle pressure). This makes it highly adaptable in single-lane traffic, but for multi-lane traffic, it is necessary to ensure that the overall load-bearing capacity of the bridge can meet the needs.

### Multi-lane requirements in practical applications

- **Temporary traffic solutions**: In some emergency situations, such as rescue operations after natural disasters or temporary passages during construction, the 321 Bailey Bridge can be spliced ​​side by side to achieve two-lane traffic to meet temporary multi-lane traffic needs.

- **Long-term use**: For long-term multi-lane traffic needs, the 321 Bailey Bridge may require more complex design and reinforcement to ensure its stability and load-bearing capacity.

### Summary
The 321 Bailey Bridge is designed mainly for single-lane traffic, but in some cases it can be spliced ​​side by side to achieve two-lane traffic. For multi-lane traffic needs, the load-bearing capacity and stability of the bridge need to be considered and appropriately designed and modified. In practical applications, the Type 321 Bailey Bridge can meet a variety of traffic needs, including temporary multi-lane traffic, through flexible assembly methods.

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