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California's Largest Structural Precast Manufacturer
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Welcome to Hanson Spancrete's Frequently
Asked Questions list.
Our site is currently under construction, and
is updated regularly. Please visit us often
to get the most up-to-date information.
If you cannot find the answer to your question
here, please
click here to e-mail your question to us.
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What is prestressed concrete?
Prestressed concrete is an architectural and
structural material of great strength. Prestressed
architectural and structural concrete units are given
predetermined, engineered stresses which counteract
the stresses that occur when a unit is subjected
to loads. This is accomplished by combining two
quality materials: high tensile steel and high
strength concrete. There are two methods of
prestressing: post-tensioning and pretensioning.
How are Hanson Spancrete products manufactured?
The Hanson Spancrete system utilizes pretensioning
due to its adapatability to mass-production in a plant.
This manufacturing operation results in completely
finished prefabricated members ready for delivery
to the job site. High tensile steel strands are
stretched between abutments at each end of casting beds.
Concrete is then machine-extruded to encase the strands.
As the concrete sets, it bonds to the tensioned
steel. When the concrete reaches a specified strength,
the tensioned strands are released from the abutments.
This stresses the concrete, putting it under
compression and creating built-in tensile strength.
What is the difference between ordinary concrete
and prestressed concrete?
ORDINARY CONCRETE
Even without a load, the ordinary concrete beam must
carry its own considerable weight - which leaves only
a portion of its strength available for added loads.
Under a load, the bottom of the beam will develop
hairline cracks.
PRESTRESSED CONCRETE
Prestressed before it leaves the plant, a slight
arch, or camber, is noticeable. Energy is stored
in the unit by the action of the highly tensioned
steel which places a high compression in the lower
portion of the member. An upward force is thereby
created which in effect relieves the beam of having
to carry its own weight. The upward force along
the length of the beam counteracts the load applied
to the unit.
What are some of the products Hanson Spancrete sells?
Some of the products Hanson Spancrete sells include
planks, girders, double tees, columns, and spandrels.
HSP also manufactures special products to accommodate
unconventional designs. For more information
about our products, click here
for our Products page, or
click here to e-mail our Sales Department.
What are some of the services HSP provides?
In addition to manufacturing and installing
precast concrete components, HSP offers Engineering
and Drafting services. Our Engineering and Drafting
Departments coordinate with the General Contractor,
Architect and Engineer of Record, making our
products even easier to incorporate into your project.
For more information about these services, please
contact our Sales Department at (626) 962-8751, or
click
here to e-mail us.
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Corporate Office
13131 Los Angeles Street
Irwindale, CA 91706
Phone: (626) 962-8751
Fax: (626) 962-8752
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Northern California
3478 Buskirk Ave., Suite 1039
Pleasant Hill, CA 94523
Phone: (925) 746-7176
Fax: (925) 746-7173
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San Diego Production
389 F. Hollister Street
San Diego, CA 92154
Phone: (619) 423-9030
Fax: (619) 423-2390
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