Bent Cap Formwork

The bent cap is a key bridge component that connects piers and supports the superstructure. It comes in various structural forms. In bridge engineering, steel formwork is commonly used for cap beam construction, with cuplock scaffolding as the supporting system, and pumped concrete for casting.

Construction Process

Site preparation
Steel cap beam material delivery
Assembly of support system
Installation of steel cap beam and steel columns
Laying the bottom formwork with elevation control and pre-camber setting
Splicing and welding the bottom plate to columns
Installation and welding of side plates connected to columns
Installation and welding of stiffening plates
Installation and welding of the top plate
Non-destructive testing
Application of anti-rust paint

Cap Beam Welding Sequence

Assemble and weld columns on-site → lay bottom side steel plates
Connect bottom plates to side columns with splicing plates → weld bottom side plates
Weld stiffening plates on the bottom plate
Symmetrical hoisting and welding of side plates and vertical stiffeners; connect side plates to column sides using splicing plates
Weld all side plates and vertical stiffeners
Weld transverse stiffeners on the top plate and install the top plate
Weld seams between the top plate and side plates; firmly weld the top stiffeners
Remove temporary supports

Support System Design

Foundation Treatment

Lay 25–30 cm thick 12% lime soil, compacted with a heavy-duty roller to ensure bearing capacity.
The ground level should be lower than the foundation, ensuring effective drainage to avoid water accumulation.
Lay 5 cm thick scaffolding boards according to vertical pole spacing before scaffolding erection.

Main and Secondary Beams

Main beam: 10×15 cm timber, placed transversely, aligned with vertical poles, tightly wedged with top supports.
Secondary beam: 10×10 cm timber, spaced at 25 cm (10 cm at heavily loaded sections).

Scaffolding Parameters

Cross-bridge and longitudinal pole spacing: 60 cm; step height: 60 cm.
Outside pier scaffolding: upright spacing 90 cm, longitudinal spacing 60 cm, step height 60 cm.
Single-row two-way scissor braces; one longitudinal brace for every three rows of poles.
Horizontal scissor braces evenly arranged along the height.
Use 3m, 1.8m, and 0.9m steel pipes; base laid with 5 cm thick wooden boards; adjustable base height: 30 cm.
Horizontal bar set 20 cm above the base.
Double-row two-way scissor braces every 5 vertical rows, continuously installed in height and length.
Scissor brace overlap length: 100 cm, secured with 3 swivel clamps; minimum distance between joints: 50 cm.

Key Features

Technical Specifications

Case Study

We believe the projects that we have executed speak for themselves. CITIC HIC has engineered and provided 6 AG mills of Ø12.2m×11m (28000kW gearless drive) and 6 overflow discharge ball mills of Ø7.9×13.6m (2×9000kW gear drive) for Sino Iron Project in Australia. For Zijin Mining’s Duobaoshan Copper Mine project in Heilongjiang, we have manufactured and provided SAG mills of Ø11×6.4m (2×9000kW) and overflow discharge ball mills of Ø7.9×13.6m (2×9000kW) which have been well operating currently.

Brazilian Miner Vale SA

23 large-scale ball mills, Ø5.5×8.8m

Wengfu Phosphate Mine Project Phase II in Saudi Arabia (Ma'aden)

6 wet grinding rod mills, Ø4.6×6.7m

Vedanta Project in South Africa

1 SAG mill, Ø8.5×5.5m

Laos Phonesack Group's KSO Gold Mine Project (83,000t/d)

6 SAG mills, Ø8.8×4.8m

Mongolian Erdenet Mining Corporation's Copper Mine Project (20,000t/d)

SAG mill, Ø9.75×4.88m

Full-process Solution for Mineral Grinding

Why Choose CITIC HIC's Grinding Mills

High cost-effectiveness
CITIC HIC grinding mills are recognized as China’s Manufacturing Industry Single Champion Product. CITIC HIC is responsible for setting the national standards of semi-autogenous mills (SAG mills) and ball mils, supported by powerful database, optimized process technology, cutting-edge design concept, and 60 years of experience in developing and nurturing innovative technology.
High operating rate
The long life cycle of our products is based on the adoption of international standards, high-quality materials, state-of-the-art processing techniques.
Low-carbon & environmental-friendly processes
Intelligent control technology coupled with long-life wear-resistant materials results in low-carbon and eco-friendly operations.
High-efficiency service
Our service network is distributed all over the world, and our service team of seasoned professionals is reliable and willing to assist along the way. We are able to deliver quick response to customer needs and provide full life cycle support via online monitoring and diagnosing, product upgrading and continuous process improvement.