bridges precast
Post on 23-Jan-2018
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Dr f Dejahang (BSc CEng, BSc (Hons) Construction Mgmt, MSc, MCIOB, PhD)
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PRECAST BRIDGES
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Dr f Dejahang BSc CEng, BSc (Hons) Construction Mgmt, MSc, PhD
PRECAST BRIDGES
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PRECAST CONCERTE BRIDGES
Low Initial CostPrecast prestressed concrete
bridges are usually lower in first cost than other types of bridges.
Savings in maintenance, precast bridges offer maximum economy.
PRECAST CONCERTE BRIDGES
Minimum MaintenanceThe overall economy of a structure is
measured in terms of life-cycle costs. These include the initial cost of the
structure plus the total expected maintenance costs.
The lifetime cost of repainting steel bridges can amount to 10 to 20% of the original cost of the original cost of the bridge.
PRECAST CONCRETE BRIDGES
PRECAST CONCERTE BRIDGES
PRECAST CONCERTE BRIDGESPrecast prestressed concrete bridges built in
accordance with provincial government requirements should require very little if any maintenance.
They are constructed using high quality materials to exacting manufacturing tolerances.
Fatigue problems are minimal because traffic loads induce only minor stresses.
PRECAST CONCERTE BRIDGESFast Easy Construction
Precast prestressed bridge girders require minimal lead times because they are locally manufactured in standard shapes and sizes.
The precast components are easy to erect in any weather.
Simple connections join the deck girders to the substructure.
PRECAST CONCERTE BRIDGES
Formwork for the superstructure can be eliminated when the tops of girders are placed together to form the entire deck slab.
PRECAST CONCERTE BRIDGES
Ties between adjacent units often consist of a grouted keyway and welded or transverse post-tensioned connections.
PRECAST CONCERTE BRIDGES
For logging or low volume secondary roads, traffic can run directly on the girder deck.
PRECAST CONCERTE BRIDGESCarefully planned details will speed the construction
process and save money.Minimum Traffic InterruptionMaintaining traffic and eliminating detours are difficult
problems for bridge owners.Precast prestressed concrete integral deck bridges can
minimize traffic interruptionThis is because of the availability of long span, plant-
produced sections and the speed of erecting a bridge
PRECAST CONCERTE BRIDGES
In emergencies, precast girders can be rush ordered and a bridge reopened in a matter of days or weeks using standard components.
PRECAST CONCERTE BRIDGES
PRECAST CONCERTE BRIDGESSimple span precast bridge deck girders can be
pinned to the abutments to resist horizontal earth pressures
Or designed as integral abutments to eliminate troublesome expansion joints
Multi-span bridges can be made continuous for a smoother ride and to reduce the number of expansion joints
Minimum Span/Depth Ratio
PRECAST CONCERTE BRIDGES
Assured Plant Quality
Assured Plant Quality
Assured Plant Quality
Durable
Durable
Durable
PRECAST BRIDGES
PRECAST BRIDGES
PRECAST BRIDGES
PRECAST BRIDGES
PRECAST CONCERTE BRIDGES
Precast concrete structural elementsFactory site
PRECAST CONCERTE BRIDGES
PRECAST CONCERTE BRIDGES
Stockpiled in Advance
PRECAST BRIDGES
PRECAST BRIDGES
Supply and Chain- Just-In-TimePRECAST BRIDGES
PRECAST BRIDGES
PRECAST BRIDGES
PRECAST CONCERTE BRIDGES
PRECAST CONCERTE BRIDGES
PRECAST CONCERTE BRIDGES
PRECAST CONCERTE BRIDGES
PRECAST BRIDGES
PRECAST BRIDGES
Piers can be made of precast concrete pieces quickly assembled in the field.
PRECAST CONCERTE BRIDGESAttractivePrecast prestressed concrete bridges can be designed to
elegantly blend harmoniously with their surroundingsIt can offer an attractive view from above, beside and below.StrongToughDurableCan be constructed using the low depth/span ratios possible
using high strength precast prestressed concrete and the simple clean shapes of locally available sections.
Bridge deck erection gantries for pre-cast concrete viaducts
Bridge deck erection gantries for pre-cast concrete viaducts
Concrete bridge deck erection gantry Picture shows one of the self launching bridge
deck erection gantry for erection of precast concrete segments on the 75m approach spans
Used for Sutong cable stayed bridgeThe gantry was designed to handle precast
concrete segments weighing up to 160 tonnes each
Bridge deck erection gantries for pre-cast concrete viaductswhich were erected by the balanced cantilever
methodand to suspend a half span of segments adjacent
to deck movement joints weighing up to 1100 tonnes.
The gantry was designed to handle deck longitudinal gradients of +/- 3%, deck plan minimum curvature of 950m and to skid sideways to erect adjacent box girders.
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