2016 Steel Bridge Competition/stainless Steel Bridges

Build and dismantle speed of Type 321 Bailey Bridge

Type 321 Bailey Bridge is known for its fast build and dismantle features, which allows it to be put into use quickly in emergency situations. The following is specific build and dismantle speed information:

1. **Fast build**
Type 321 Bailey Bridge adopts modular design, and each component can be prefabricated in the factory and then transported to the construction site for rapid assembly. This design greatly shortens the construction period, allowing Bailey Bridge to be built in a short time. For example, in a flood rescue drill in Yulin City, 21 emergency rescue team members successfully erected a Type 321 Bailey Bridge with a single span of 12 meters long and 3.75 meters wide in just one and a half hours.

2. **Fast dismantle**
The dismantling process of Type 321 Bailey Bridge is also fast. Due to its modular design, it only needs to dismantle each component one by one, and then load it back. This design not only improves construction efficiency, but also reduces dependence on professional equipment and personnel.

3. **Actual Application Cases**
In actual applications, the rapid erection and disassembly capabilities of the 321-type Bailey Bridge make it an ideal choice for emergency situations. For example, during the 2008 Wenchuan earthquake, a large number of 321-type Bailey Bridges were used for disaster relief, ensuring the forward transportation of earthquake relief materials, the evacuation of the wounded, and the evacuation of the masses.

Summary
Due to its rapid erection and disassembly characteristics, the 321-type Bailey Bridge can be quickly put into use in an emergency and provide strong support for rescue work. The modular design of this bridge not only improves construction efficiency, but also reduces dependence on professional equipment and personnel, making it an ideal choice for responding to various complex engineering needs.

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