DEP Capabilities in Roads, Bridges and Tunnels

ROADS DESIGN

Highway engineering is an engineering discipline branching from civil engineering that involves the planning, design, construction, operation, and maintenance of roads, bridges, and tunnels to ensure safe and effective transportation of people.

DEP provide smart corridors to move people into the future and not just moving them from place to place

Our services include the following:

• Planning, design, development, and construction
• Analyzing and resolving traffic impacts
• Navigating the environmental process
• Asset management
• Technical concepts and modeling

ROADS GEOMETRY

The geometric design of roads deals with dimensions and layout of visible features AASHTO deals with the following elements:

• Functional Classification
• Alignment
• Cross Section
• Intersections
• Interchanges
• Freeways

BRIDGES TYPES

DEP design bridges to enrich skylines and provide efficient transportation and carrying pedestrians, roads and pipelines.

Our services include the following bridge types:

• Complex
• Conventional
• Long-span
• Pre-stressed
• Post-tensioned
• Suspension
• Cable-stayed
• Segmental
• Steel
• Concrete

BRIDGES GEOMETRY

The overall bridge and head slope geometry should be determined in accordance with the Department’s Bridge Conceptual Design Guidelines.

When designing bridges, we carry out these elements:

• Bridge Alignment
• Grades and Cross fall
• Head slopes, Side slopes and Approaches
• Deck Width
• Span Lengths, Substructure Stationing and Bearing Setting
• Horizontal & Vertical Clearances

TUNNELS DESIGN

Tunnel systems are generally complex and critical.

Design criteria for new roadway tunnels should consider:

• Performance-based construction specifications
• Design recommendations for extreme events (manmade and natural [e.g., seismic and storm events]) and tunnel security.
• Design criteria for vertical clearance, horizontal clearance, and sight distance
• Criteria for tunnel design life and future maintenance for structural, mechanical, electrical, and electronic systems
• Criteria for new tunnel load rating
• Seismic design criteria
• Placement and layout of the tunnel operations center
• Fire and life-safety systems in tunnels

TUNNELS GEOMETRY

The geometric characteristics have to be defined at the earliest stage of the conception of a tunnel, and even of a road link comprising possibly one or more tunnels.

These characteristics are of very different natures, and can be grouped in the following categories:

• The relation between construction method and cross-section
• The theoretical notions related to traffic capacity
• The general alignment of the road comprising the tunnel:
• • number of carriageways and lanes,
  • off-carriageway provisions (lateral and possibly central),
  • headroom,
  • maximal slopes,
  • minimal horizontal and vertical radiuses,
  • transverse slopes,
  • the detailed characteristics of the transverse profile inside the tunnel

• The specific geometric characteristics of other features located out of the cross-section: emergency exits, evacuation galleries, by-passes, cross-connections, etc.
• The influence of the geometrical characteristics on safety.