Bridges precast

1. Dr f Dejahang (BSc CEng, BSc (Hons) Construction Mgmt, MSc,MCIOB,PhD)
017
PRECAST
BRIDGES
http://www.cpi-team.com

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Dr f Dejahang BSc CEng, BSc (Hons) Construction Mgmt,
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3. PRECAST BRIDGES
ABC Precast Concrete County Bridge Construction - YouTube.htm
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Bridge-arch installation 02.VOB - YouTube.htm
Bridge-Construction - Macrete FlexiArch Bridge System - YouTube.htm

4. PRECAST CONCERTE BRIDGES
Low Initial Cost
Precast prestressed concrete
bridges are usually lower in first
cost than other types of bridges.
Savings in maintenance, precast
bridges offer maximum economy.

5. PRECAST CONCERTE BRIDGES
Minimum Maintenance
The 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.

6. PRECAST CONCRETE
BRIDGES

7. PRECAST CONCERTE BRIDGES

8. PRECAST CONCERTE BRIDGES
Precast 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.

9. PRECAST CONCERTE BRIDGES
Fast 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.

10. PRECAST CONCERTE BRIDGES
Formwork for the
superstructure can be
eliminated when the tops of
girders are placed together to
form the entire deck slab.

11. PRECAST CONCERTE BRIDGES
Ties between adjacent units
often consist of a grouted
keyway and welded or
transverse post-tensioned
connections.

12. PRECAST CONCERTE BRIDGES
For logging or low
volume secondary roads,
traffic can run directly on
the girder deck.

13. PRECAST CONCERTE BRIDGES
Carefully planned details will speed the construction
process and save money.
Minimum Traffic Interruption
Maintaining traffic and eliminating detours are difficult
problems for bridge owners.
Precast prestressed concrete integral deck bridges can
minimize traffic interruption
This is because of the availability of long span, plant-
produced sections and the speed of erecting a bridge

14. 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.

15. PRECAST CONCERTE BRIDGES

16. PRECAST CONCERTE BRIDGES
Simple 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

17. Minimum Span/Depth Ratio

18. PRECAST CONCERTE BRIDGES

19. Assured Plant Quality

20. Assured Plant Quality

21. Assured Plant Quality

22. Durable

23. Durable

24. Durable

25. PRECAST BRIDGES

26. PRECAST BRIDGES

27. PRECAST BRIDGES

28. PRECAST BRIDGES

31. PRECAST CONCERTE BRIDGES

32. Precast concrete structural elements
Factory site

33. PRECAST CONCERTE BRIDGES

34. PRECAST CONCERTE BRIDGES

35. Stockpiled in Advance
PRECAST BRIDGES

36. PRECAST BRIDGES

37. Supply and Chain- Just-In-Time
PRECAST BRIDGES

38. PRECAST BRIDGES

39. PRECAST BRIDGES

40. PRECAST CONCERTE BRIDGES

41. PRECAST CONCERTE BRIDGES

42. PRECAST CONCERTE BRIDGES

43. PRECAST CONCERTE BRIDGES

44. PRECAST BRIDGES
PRECAST BRIDGES

45. Piers can be made of precast concrete pieces
quickly assembled in the field.

46. PRECAST CONCERTE BRIDGES
Attractive
Precast prestressed concrete bridges can be designed to
elegantly blend harmoniously with their surroundings
It can offer an attractive view from above, beside and below.
Strong
Tough
Durable
Can be constructed using the low depth/span ratios possible
using high strength precast prestressed concrete and the
simple clean shapes of locally available sections.

47. Bridge deck erection gantries for
pre-cast concrete viaducts

48. 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 bridge
The gantry was designed to handle precast
concrete segments weighing up to 160 tonnes
each

49. Bridge deck erection gantries for
pre-cast concrete viaducts
which were erected by the balanced cantilever
method
and 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.