Question: What spans are available?

Answer: 12’, 14’, 16’, 20’, 24’, 28’, 32’, 36’, 42’ and 48’

Download Waterway Area (PDF)

Question: What vertical rises are available?

Answer: Rises can range from 4’ to 14’ depending on the span and local shipping restrictions.

Question: What is the width of a single precast arch unit?

Answer: The standard (and maximum) width of units is 8’ for spans 24’ and lower and 6’ for spans 28’ and greater. Non-standard widths less than 8’ or 6’ can be made to any dimension required.

Question: What is the minimum amount of cover that can be used with a CON/SPAN® structure?

Answer: The CON/SPAN® structure can be designed to resist wheel loads applied directly to the top of the arch. As a minimum, we would recommend continuing the standard pavement cross section over the top of the structure for pavement performance reasons.

Question: What is the maximum amount of cover that can be used with a CON/SPAN® structure?

Answer: There is not a theoretical maximum amount of cover that can be carried by a CON/SPAN® structure. We are most economical in the 1 foot to 15 foot range of cover, however, we can accommodate large amounts of fill up to 50’ in some applications. Contact CON/SPAN® or your local provider for your specific high fill application.

Question: What loadings can a CON/SPAN® structure be designed for?

Answer: The most typical design loadings are highway live loads such as HS20-44, HS25-44, HS27 and the alternate military loading. We also have designed structures to resist railroad live loads (Cooper E80, E90), aircraft live loads (747) and various mining and off road construction vehicles. We can custom design a structure for any load requirement.

Question: Can CON/SPAN® accommodate skewed ends?

Answer: When the skew is significant enough to address with the alignment of the structure, we choose to handle skews in one of two ways. If the site permits it, we try to square off the end of the structure and carry our fill slopes out to the far corner and utilize a shorter in height and length of wingwall at the two corners of the structure. We can accomplish this since we have a curved top that allows the fill to be sloped down over the corner of the bridge. We would also then try to use typical roadway guiderails instead of bridge railing across the top of the structure. If the site does not permit the extension of the structure then we would try to accommodate the skew in the end unit of the bridge.

Question: Is a price list available?

Answer: CON/SPAN® Bridge Systems are available in a wide range of sizes, options and special custom features. Please contact your local provider with your project specific requirements for an accurate cost estimate/quote. CON/SPAN® precast structures are economical, over 60% of the 3500 bridges installed to date have been public, open bid contracts with alternate structures as bid options.

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Question: What information does CON/SPAN® need in order to prepare design drawings for bridge structure?

Answer: A Geotechnical Report with a recommended allowable bearing pressure, and a plan and profile of the structure. If you are just in the preliminary stages of a project, following are some of the factors to consider:

Hydraulic requirements, waterway opening, allowable headwater, freeboard, live loading, soil bearing and scour considerations, site plan and profile, available height, roadway width and side slopes, dimensional restraints, right-of-way, site features

Question: What is the fee if CON/SPAN® prepares design drawings of the bridge structure?

Answer: There is no additional charge if CON/SPAN® prepares a set of basic design (installation) drawings for the bridge structure including a simple (strip footing or base slab) foundation design. Additional engineering fees may apply for non-standard structures and pedestal or pile foundations. Contact your local CON/SPAN® provider for an estimate of the additional engineering fees.

Question: Do you do foundation design?

Answer: Generally, CON/SPAN® can provide foundation designs and drawings if we are provided with a geotechnical report with a recommended allowable bearing pressure. There is an additional engineering fee for deep and pedestal wall foundations. However, it is primarily the project engineer's responsibility to review our design when they do not perform the design themselves.

Question: Do you do hydraulic design?

Answer: Generally, the hydraulic design is the responsibility of the owner's project engineer. However, for an additional engineering fee, CON/SPAN® can provide hydraulic design services if we are given stream geometry and flow information.

Question: What is the maximum height and length that a CON/SPAN® precast wingwall can be?

Answer: The maximum height of a CON/SPAN® precast wingwall is 20’ with level backfill. Contact CON/SPAN® or your local provider for maximum heights with sloping backfill. Single unit lengths are up to 24 feet and can be used in multiples for long walls.

Question: If I want to purchase a bridge, who do I contact and will CON/SPAN® install the structure?

Answer: To purchase a bridge, you should contact your local CON/SPAN® provider. CON/SPAN® does not install the structure. A contractor is typically required to perform the excavation, cast the foundations, supply a crane and then backfill the structure and construct the roadway.

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Question: How are CON/SPAN® units installed and are the units connected to one another?

Answer: A crane is required to install the precast units. The units are set in the keyway that is formed in the top of the foundation. Once the units are set, the keyway is grouted and then the structure is backfilled. Typically the units are not connected to each other, except in the case of very high headwalls on the end units, then the end units are connected to the adjacent unit.

Download Installation Handbook (PDF ) (13.1 MB file size)

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