1. GENRAL INFORMATION ABOUT BOX CULVERTS
Group member: Mohammad Omar, Rahman Ullah, Luqman, Muhib urahman, Samiullah
The Islamic Emirate of Afghanistan
Ministry of Higher Education
Sheikh Zayed University
Bridge Definition .
What is Culvert.
Type of Culverts.
Difference between Bridge and Culverts.
Introduction of Box Culvert.
Components of Box Culvert
Important point about Box culvert.
Box culvert construction method.
ADVANTAGES OF BOX CULVERT.
Bridge is a structure which is made up between highway
Railway and river used to transfers animal, people and
Minor Bridges – Span greater than 6m up to 60m
Major Bridges – Span greater than 60m
• Culvert is a cross-drainage structure having a total length of 6m.
• The types of culverts are:
1-Box culvert(a box culvert is a structure which consisting of two
horizontal and vertical slabs.)
3-RCC solid slab culvert
7. S.NO BRIDGES CULVERTS
1 A bridge is a passage of transportation
(for people or vehicles) over a large body
of water or physical obstruction.
A culvert is generally a tunnel-like structure that
allows to pass under a roadway or railway.
2 The basic components of a bridge are
superstructure (supports load),
substructure (transfers load to foundation
soil) and deck (transfers surface load to
The components of a culvert are comparatively
simpler and include concrete boxes or cells (single
or multiple), pipes, a top deck or slab and
3 Bridges are constructed at a height
more than 20 feet.
Culverts are built at less than 20 feet high over the
4 A bridge spans from 6 meters (minor
bridges) to more than 120 meters.
The length of culverts is typically not more than 6
5 The construction of a strong and deep
foundation is very important in
building a bridge. The foundation
along the entire breadth supports the
No deep foundation is required for a culvert.
8. The culvert consisting of one or more numbers of rectangular or square
openings, having their floor and top slabs constructed monolithically with
abutments and pier, is known as box culvert.
10. • A four sided culverts are typically referred to as box culverts.
• Standard box sizes : 0.9*0.6m to 3.6*3.6 in 0.3 m span and raise
• 3 sided structure is a u shaped structures that may or may not
have a crown in the center
• and its size range from 2.5m to 15m span lengths .
• Box culverts are mainly constructed where the soil is soft and the
load has to be distributed over a wider foundation area.
• Box culverts are made up of concrete and especially
RCC(reinforced concrete cement).
11. BOX CULVERT
• The most challenging part in constructing a box culvert is
that dry surface is needed for
• installing it
• However ,due to strength of the concrete floor ,water ,
direction can be changed when a large amount of water is
• This feature makes box culverts , one of the most commonly
found types of the culvert.
12. WET CAST METHOD
•Typically cast on end using outer and inner form
•Cast with conventional concrete or self
•Product cured in the form
•Wet cast is commonly used in sanitary
DRY CAST METHOD (MACHINARY METHOD )
•product cast using mechanized equipment
•Product is immediately stripped and the
form is reused
14. Box culverts are
• Lateral earth loads from soil and hydrostatic loads from
• Vertical loads from the cover soil and live loads above.
• Surcharge loads from nearby impact loads.
• Seismic loads where applicable.
• Short-span bridges (over highways, waterways, railways, for golf
• Conveyance of storm water, sewage or industrial wastes (storm drains)
• Tunnels (to house conveyers, utilities, etc; to provide access, escape
3 sided culverts
• short -span bridges(flat and arched)
16. ADVANTAGES OF
• The box culvert is a rigid frame structure and very simple in
• It is suitable for non-perennial streams where scrub depth is not
sufficient but the soil isweak
• The bottom slab of the box culvert reduces pressure on the soil
• Box culverts are economical due to their rigidity and monolithic action
and separate foundations are not required
• It is used in a special cases , weak foundation.
1. Johnson victor, D., Essentials of bridge engineering, (fifth edition),
Oxford & IBH Publishing co. Pvt. Ltd. New Delhi, 2001,
2. Krishna Raju, Design of Bridges (Fourth Edition), Oxford & IBH
Publishing co. Pvt. Ltd. New Delhi, 2009,