Civil Engineering Section

Rapid effective way to build large scale bridges

Precast segment bridges are built by assembling precast segments at site. It has advantages of industrialized, repetitive construction procedures which contribute to the reductions in cost and construction time. Irabu Bridge was built with this method for its 46 spans, total 3,120m.

Composite bridges combine advantages of concrete and "lightness" of steel

Corrugated steel web bridge

Combined with corrugated steel webs as well as struts for wide cross sections, concrete core section and overall weight are effectively reduced. Using steel webs as part of construction support further reduces cost and time.

Composite truss bridge

Composite truss reduces structural weight and works in harmony with landscape. In this example, compared to the 4 year older parallel composite truss bridge, the cost was reduced further by using a smaller number of truss members effectively.

• Sarutagawa and Tomoegawa Bridge

The longest concrete arch bridge in North America

This 323m span arch bridge was constructed in front of Hoover Dam. Latest technologies are utilized in this bridge such as twin arch ribs, steel struts between the arch ribs, precast segment piers, and steel-concrete composite superstructure.

High durability under a harsh marine environment

PC technology is used for marine structure such as pier, jetty, offshore airport and structural strengthening. It prevents cracking of concrete and realizes high durability. Using high quality precast elements limits long term impact under a harsh environment. It also reduces site works and indirect costs such as formworks and scaffolding. Impact from bad weather and hydrographic conditions is reduced. It offers rapid, safe and reliable construction.

Pier strengthening is possible even under water

Confined by precast panels and integrated by means of high-strength prestressing strands, bending resistance and ductility of piers are improved. Its structural soundness was proved in the disastrous Tohoku earthquake and tsunami in 2011. As for construction under water, the PC confined method eliminates conventional temporary sheet piles and reduces construction time and environmental impact.

Underground continuous wall using PCaPC members

H-shaped PC piles were developed for retaining walls. PC piles remain in the ground and serve as temporary and permanent retaining structure. It reduces construction time, noise and vibration. Piling close to neighboring structure is possible with limited impact to surroundings. H-shaped PC piles have been applied to road retaining walls, underpass sidewalls, underground structural sidewalls, and water penetration prevention walls.