Construction Equipment Modular Panel Bridges Compact TSR Structure

Construction Equipment Modular Panel Bridges/compact Panel Bridge

Construction time of Type 321 Bailey bridge in military operations

The construction time of Type 321 Bailey bridge in military operations varies depending on the span, complexity and proficiency of the bridge operators. Here are some specific cases and data:

1. **Actual case**
- On July 6, 2016, the bridge squadron of the Sixth Brigade of the Armed Police Traffic Brigade built a Bailey bridge in Dingjiazhai Village, Yanjiahe Town, Macheng City to rescue more than 800 villagers trapped in Yejia Village on the opposite bank. The bridge is nearly 200 meters long. One of the damaged and collapsed parts is close to the embankment abutment of Yanjiahe Town, with a length of more than 30 meters; the other is located in the middle of the bridge, close to Yejia Village, with a length of about 40 meters. The officers and soldiers of the Armed Police Traffic Force worked continuously day and night, and finally completed the construction of the bridge in 18 hours and 35 minutes.

- In November 2015 and September 2016, the Lishui Highway Administration Bureau conducted emergency erection and dismantling drills for the 321-type Bailey bridge in response to landslide geological disasters. In one drill, the rescue team successfully erected a 321-type Bailey bridge with a single span of 12 meters and a width of 3.75 meters in just one and a half hours.

2. **Theoretical data**
- According to the user manual of the 321-type Bailey bridge, the assembly and laying of the bridge are very convenient and the bridge can be built in a short time.
- In general, the construction time of the 321-type Bailey bridge depends on the span and complexity of the bridge. For a bridge with a single span of about 30 meters, skilled operators can usually complete the construction within 6 to 12 hours.

Summary
The construction time of the Type 321 Bailey Bridge in military operations usually ranges from a few hours to a day, depending on the span, complexity and proficiency of the bridge operators. Its rapid construction and disassembly features make it an ideal choice for emergency situations.

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