100m Steel–Concrete Composite Bridge Construction

Next-Generation Long-Span Simple Span Bridge Solution

Steel–Concrete Composite Bridge Construction is an advanced bridge construction method that combines the high strength of steel box girders with the durability of reinforced concrete bridge decks. The composite structure significantly reduces the bridge self-weight while maintaining excellent structural performance. Compared with conventional reinforced concrete bridges, the lighter steel superstructure allows much longer simple spans—up to 100 meters without intermediate supports. Compared with all-steel bridges, the composite system greatly reduces steel consumption, resulting in lower construction costs and easier maintenance throughout the bridge's service life.

The bridge deck consists of reinforced concrete slabs cast on top of prefabricated steel box girders, creating a composite structural system that offers high stiffness, excellent durability, rapid construction, and outstanding economic efficiency.

This construction method is widely used for highway bridges, railway bridges, urban viaducts, river crossings, and long-span infrastructure projects.

1. Site Preparation

Keywords

• Site investigation

• Heavy lifting area

• Steel girder transportation

• Temporary access road

Description

The first stage focuses on preparing the construction site for transporting and installing large prefabricated steel box girders. Adequate crane platforms, storage yards, and transportation routes are established to ensure efficient construction.

Main Activities

• Site survey and layout

• Temporary access road construction

• Crane foundation preparation

• Steel girder storage yard setup

• Traffic management and safety protection

Key Considerations

• Transportation route capacity

• Crane operating space

• Ground bearing capacity

• Construction safety planning

2. Foundation Construction

Keywords

• Bored pile foundation

• Reinforced concrete pile cap

• Bridge foundation

• Deep foundation

Description

Deep foundations are constructed to support the large-span composite bridge. Depending on soil conditions, bored piles or pile groups are installed before constructing reinforced concrete pile caps.

Main Activities

• Bored pile drilling

• Reinforcement cage installation

• Concrete placement

• Pile cap construction

• Quality inspection

Key Considerations

• Bearing capacity

• Accurate pile positioning

• Concrete quality

• Foundation stability

3. Pier Construction

Keywords

• Reinforced concrete pier

• Pier cap

• Bridge substructure

• Heavy load support

Description

Bridge piers are designed to support the long-span steel composite superstructure while minimizing the number of supports. The reduced number of piers shortens construction time and minimizes environmental impact.

Main Activities

• Pier reinforcement installation

• Formwork erection

• Concrete pouring

• Pier cap construction

• Survey verification

Key Considerations

• Vertical alignment

• Elevation accuracy

• Concrete strength

• Structural stability

4. Girder Installation

Keywords

• Steel box girder

• Heavy lifting crane

• Segment erection

• Composite bridge

Description

Prefabricated steel box girders are manufactured under factory-controlled conditions and transported to the project site. Heavy cranes or launching equipment lift the girders into position to form the bridge superstructure.

Main Activities

• Steel girder transportation

• Heavy lifting operation

• Girder positioning

• High-strength bolting

• Field welding and inspection

Key Considerations

• Precise alignment

• Safe lifting operations

• Welding quality

• Temporary structural stability

5. End and Surface  Treatment

Keywords

• Composite deck slab

• Post-tensioning      

• Bridge stressing

• Structural optimization

Description

After girder installation, reinforced concrete deck slabs are constructed on top of the steel box girders. Where required, post-tensioning is applied to improve structural performance, increase stiffness, reduce cracking, and enhance the overall load-carrying capacity of the composite bridge system.

Main Activities

• Reinforcement installation

• Concrete deck casting

• Tendon installation

• Hydraulic stressing

• Grouting and inspection

Key Considerations

• Accurate stressing force

• Composite action between steel and concrete

• Crack control      

• Long-term durability

6. Deck Construction

Keywords

• Reinforced concrete deck

• Waterproof membrane

• Asphalt pavement

• Expansion joint

Description

The reinforced concrete deck is cast directly on the steel box girders to form a composite structural system. Compared with full concrete superstructures, the composite deck greatly reduces self-weight while maintaining excellent stiffness and durability. After curing, waterproofing, asphalt pavement, expansion joints, barriers, and drainage systems are installed.

Main Activities

• Deck reinforcement installation

• Concrete slab casting

• Waterproof membrane application

• Asphalt paving

• Expansion joint installation

• Safety barrier installation

Key Considerations

• Composite bonding performance

• Deck level accuracy

• Waterproof durability

• Smooth riding surface

7. Completion

Keywords

• Bridge load testing

• Structural monitoring

• Final inspection

• Project commissioning

Description

Following construction, the bridge undergoes comprehensive inspections and load testing to verify structural integrity, composite action, and overall performance before opening to traffic.

Main Activities

• Static load testing

• Dynamic load testing

• Structural alignment survey

• Final quality nspection

• Project handover

Key Considerations

• Structural safety

• Composite system performance

• Deflection monitoring

• Long-term durability

                                                                                  

Q: When will you arrange the production?
A: We usually arrange the production immediately after receiving your payment if we have the item in stock. Otherwise, please confirm with us for lead time.

Q: What is your accepted payment type?
A: Wire transfer, Paypal and Western Union, and Alibaba Trade Assurance.We only accept Paypal and Western Union, and Alibaba Trade Assurance for payment amounts below USD400.

Q: What logistic forwarder do you usually work with?
A: We work with EMS, TNT, UPS, FEDEX and other logistric forwarders. Assigned your own forwarder for shipment is available.

Q: What if the Wireless Charging Bundle is not charging my device(s)?
A: 1. Check to ensure that your device is Qi-compliant.
2. Check to ensure that the AC adapter you’re using with the Wireless Charging Bundle has an output of 2A or more.
3. Check to ensure that you are placing your phone on the center of Wireless Charging Bundle.
4. Check to ensure the phone is not in a 5mm or thicker case when charging.
5. Check to ensure there is no metal obstruction on the back of the phone/phone case, or credit cards inside the case.
6. The Wireless Charging Bundle’s cable may be faulty. Try using a different cable.
7. Restart your phone. If the problem persists, please email us at support@anker.com to claim your 18-month warranty. Request sent to owner.

Q: How does the Wireless Charging Bundle charging speed compare to a traditional wired charger?
A: It depends on your device, but wireless charging generally charges at a slower rate.

Q: What is the Wireless Charging Bundle charging speed?
A: Charging speed varies depending on the device. You can expect a maximum charge current of 1A.

Q: What kind of AC adapter should I use with Wireless Charging Bundle?
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Q: Can I use a different USB cable instead of the cable that comes with Wireless Charging Bundle?
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Q: What does Wireless Charging Bundle’s LED indicator show while charging?
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Q: Is radiation from wireless chargers harmful to one’s health?
A: The PowerPort Wireless 5 Pad only emits non-ionizing radiation which is not harmful to humans. What’s more, it’s certified with FCC, CE, RoHS, etc.

Q: Does wireless charging affect other wireless devices?
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Q: Does this charger produce excessive heat?
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