4.2m Compact Bailey Bridge / Steel Bailey Truss Bridge Hot Dip

Compact Bailey Bridge/truss Bailey Bridge

When reinforcing Bailey bridges in mountainous areas, the following comprehensive measures can be taken to prevent landslides:

1. **Foundation reinforcement**
- **Anti-slide piles**: Anti-slide piles are set in the landslide body. The anti-slide piles pass through the sliding body and are anchored at a certain depth of the landslide bed to resist the thrust of the landslide. Soil nail walls can be set between the anti-slide piles to connect the anti-slide piles into a whole and jointly bear the landslide soil pressure.
- **Concrete foundation**: Concrete foundations are poured at the piers and abutments to ensure that the foundation is deep into the stable stratum and provides sufficient support.

2. **Drainage measures**
- **Surface drainage**: Vertical and horizontal intercepting drainage ditches are set on both sides of the bridge and upstream of the piers to divert surface water to a safe area to prevent surface water from seeping and lubricating the sliding surface.
- **Underground drainage**: For the groundwater in the landslide body, drainage ditches or seepage ditches are set to divert the water out of the landslide body. Drainage holes are set behind the anti-slide piles and soil nail walls to drain the accumulated water.

3. **Support engineering**
- **Anti-slide retaining wall**: Building an anti-slide retaining wall at the bottom of the landslide is one of the effective measures for landslide control.
- **Anchor retaining wall**: Adopt column-plate anchor retaining wall or vertical prestressed anchor retaining wall to prevent rock mass from sliding down through the pull-out resistance or shear force of the anchor.

4. **Local water-blocking measures**
When setting bridge piers on the landslide body, in order to prevent surface water from seeping down to the sliding surface along the loose backfill soil layer, clay can be used to seal the backfill surface, and 0.3-meter-thick C20 concrete protective surface can be laid on the surface.

5. **Isolation and pressure reduction measures**
In order to prevent the anti-slide piles from directly transmitting the soil pressure to the bridge pier foundation after displacement, affecting the safety of the bridge pier foundation structure, flexible materials that are easily deformed, such as coarse sand, can be used to backfill between the cap and the anti-slide piles.

6. **Protective measures during construction and operation**
- **Pre-reinforcement measures**: Pre-reinforce the landslide body before bridge construction.
- **Monitoring and maintenance**: During construction and operation, it is prohibited to load or abandon soil on the landslide body, and strengthen the monitoring of the slope and landslide body of the foundation pit. After completion, the landslide body is dynamically tracked and monitored, and once an abnormality is found, timely measures are taken to rectify it.

Through the above measures, landslides can be effectively prevented during the reinforcement of Bailey bridges in mountainous areas to ensure the stability and safety of the bridge.

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