Bridges precast
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Dr. F. Dejahang discusses the benefits of precast concrete bridges, including lower initial costs than other bridge types, minimal required maintenance, and fast/easy construction. Precast bridges have assured quality from manufacturing in a controlled plant environment, are durable, attractive, and allow for minimal traffic disruption during construction as precast elements can be quickly installed. Bridge piers and decks can be constructed from precast concrete segments assembled on site. Erection gantries are used to lift and install large precast concrete segments for viaduct construction.
Bridges precast
- 1. Dr f Dejahang (BSc CEng, BSc (Hons) Construction Mgmt, MSc,MCIOB,PhD) 017 PRECAST BRIDGES http://www.cpi-team.com
- 2. Science Art Religion Politics Scholarly Articles For Mathematics and Productivity http://www.twitlonger.com/show/n_1sp9pjo?new_post=true MICROSOFT OneDrive PPT’s PDF’s BOOK LESSONS Dr f Dejahang BSc CEng, BSc (Hons) Construction Mgmt, MSc, PhD
- 3. PRECAST BRIDGES ABC Precast Concrete County Bridge Construction - YouTube.htm construction of bridge - YouTube.htm 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.
- 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.
- 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
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- 32. Precast concrete structural elements Factory site
- 35. Stockpiled in Advance PRECAST BRIDGES
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- 37. Supply and Chain- Just-In-Time PRECAST BRIDGES
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- 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.