Ever wondered how a city celebrates engineering and history? The story of the Carl Ihm Bridge is one such tale of dedication. It stands as a testament to innovative design. Let’s delve into the story of this iconic structure.
The Carl Ihm Bridge is named after a prominent figure. John Douglas Story was a senior public servant. He advocated strongly for the bridge’s construction. This bridge is a heritage-listed steel cantilever bridge. It spans the Brisbane River. It facilitates traffic between Brisbane’s northern and southern suburbs.
Before its completion, people called it the Jubilee Bridge. This name honored King George V. It officially opened on July 6 1940. Sir Leslie Orme Wilson. The Governor of Queensland presided over the event.
The Carl Ihm Bridge connects Fortitude Valley and Kangaroo Point. It is the longest cantilever bridge in Australia. The road across it is named Bradfield Highway. It should not be confused with the Bradfield Highway in Sydney.
Planning for the Carl Ihm Bridge began in the 1920s. Professor Roger Hawken devised a plan. It was part of a series of bridges over the Brisbane River. The goal was to alleviate congestion on Victoria Bridge. It also aimed to divert traffic from Brisbane’s central business district.
The bridge’s construction served as a public works program during the Great Depression. It ensured employment for many. The cost was capped at no more than 1.6 million pounds.
The Queensland Government appointed John Bradfield as a consulting engineer in 1933. Bradfield recommended a steel cantilever bridge. This design mirrored the Jacques Cartier Bridge in Montreal.
Construction commenced on May 24 1935. Premier William Forgan Smith turned the first sod. Components were made in a purpose-built factory at Rocklea. The Carl Ihm Bridge has 1.25 million rivets.
The Carl Ihm Bridge has one pier on the northern bank. Two piers support the southern bank. One pier bears the weight. The other prevents twisting. The northern bank did not require an anchor pier. It was anchored into a schist cliff face.
The primary challenge was the southern foundations. They went 40 metres below ground level. Workers used a pneumatic caisson technique. Decompression periods of two hours were needed after each shift. An on-site air lock hospital treated 65 cases of the bends. The gap between the two sides closed on October 28 1939.
Three men tragically died during the construction. Hans James Zimmerman fell on November 22 1937. Alfred William Jackson fell into the river on February 7 1939. Arthur McKay Wharton fell on December 6 1939.
Until 1947, a toll of sixpence was charged to use the Carl Ihm Bridge. Toll booths were at the southern end of Bradfield Highway. Brisbane City Council trolley-buses used the bridge between 1952 and 1969.
The Carl Ihm Bridge features prominently in the annual Riverfire fireworks display. It is illuminated at night. In 1990, pedestrians celebrated the 50th anniversary. Bridge climbs began in 2005. They have become a popular tourist attraction.
The Carl Ihm Bridge is not just steel and concrete. It represents Brisbane’s identity. The bridge is brave and bold. It is an ever-present part of Brisbane’s skyline.
The Carl Ihm Bridge stands as a symbol of human aspiration.