The world first big bridge of 16 thousand tons of Longyan is finished " alone tower sheet turns "

Fujian daily

Big bridge advocate before tower turn

Big bridge advocate after tower turn is finished

The staff member is undertaking advocate the preparation before tower turn works.

(Above picture all is photographed completely by Chen Lv)

On April 10 before dawn 1 when make, brightly lit of lights of spot of project of Longyan big bridge. Big bridge of the about 121 meters tall, gem that makes an appointment with 16 thousand tons again compressed shape advocate tower in order to make an appointment with minutely for a time speed, anticlockwise undertake place rotates. After, advocate the tower finishs 69 degrees of turn, came true " alone tower sheet turns " . This kind " alone tower sheet turns " alive bound still belongs to construction in the inclined construction that play the bridge first.

Longyan big bridge advocate bridge work area is located in Longyan downtown the city zone, east adjacent two railroad line, among them line of Long Zhanggao iron is special railway line of one class passenger transport, have course of nearly 120 train everyday. Advocate the tower leaves railroad the distance is not worth 6.5 meters recently, and advocate line of railroad of tower tower above is close 110 meters, will give advocate tower construction works and railroad moving safety brings particular risk.

How to eliminate a risk? Ministry of project of Longyan big bridge holds technical analysis to meet for many times, via many rounds of argumentation, decide pair of big bridges finally advocate the tower undertakes " alone tower sheet turns " construction. Alone tower sheet turns, namely big bridge advocate the tower undertakes building by as parallel as railroad direction first, the least space that makes tower is apart from railroad increases nearly 20 meters 6.5 meters from inadequacy, in order to ensure construction space, reduce the effect to railroad. Advocate after tower construction is finished, place turn arrives 69 degrees book the position.

Want essence of life to allow accuse advocate the turn angle of column of the tower in tower turn process poises, be not easy thing. To make turn perfect, the project measures a group to be in advocate set beforehand in tower construction process measure prism, every phenomenon prism is installed in cat head, ensure much angle is accurate measure. And the ball bore with a reamer that uses when turn, also pass strict control.

"The diameter of ball bore with a reamer that turn uses is as long as 5 meters, gross weight exceeds 120 tons, design the largest carrying capacity to be as high as 25 thousand tons, be equivalent to can bearing the weight of iron tower of Er of 2.5 dust humble. " project manager Li Chuan says, to assure the balance in turn process, the staff member spends the balance strict control to be in when ball bore with a reamer is installed 0.5 millimeter less than, at the same time setting armor plate is mixed get together slide block of 4 fluorine ethylene, control fills the gap between foot and slideway, precaution blows brought adverse effect.

To why undertake turn construction in before dawn? The staff member tells project ministry the reporter, it is to ensure drive a vehicle of railroad, highway and dweller to give a security.

As we have learned, this second advocate after tower turn is finished, longyan big bridge will undertake top of steel box roof beam is pushed, 2 zip, turn, solder, the each node project such as shop bitumen. Predict to will undertake on August 7 advocate the bridge 2 turn (turn 21 degrees of) , arrive to design the place finally, the butt joint has bridge approach of north and south, will finish on August 11 advocate bridge girder closure. Longyan big bridge plans on October 1 be open to traffic, complete of all fronts before December 30 is cast with. After big bridge builds be open to traffic, will solve traffic of the city zone effectively to have a problem, shorten greatly distance of the city zone of Longyan town north and south, accelerate Longyan city unifinication to build. (Kong Sufang of Huang Xiaojing of reporter Zhang Jie's reporter)