The world first! Fujian Longyan big bridge is finished " alone tower sheet turns "

On April 10 before dawn, by in build 6 bureaus bear the Fujian Longyan big bridge that build is 100 meters 10 thousand tons tall advocate the tower is finished anticlockwise 69 degrees rotate, initiate Liang Xie of world steel box to play the bridge 2 times turn construction (alone tower sheet turns and tower bridge turns in all) beginning, showed the freeboard level that Chinese infrastructure builds to the world.

Ensure safety of drive a vehicle for utmost, that day, "Alone tower sheet turns " exercise undertakes in before dawn. Construction site lamplight brights, about 16 thousand tons " lapidary " model compressed shape bridge advocate tower, with minutely for a time speed, undertake place rotates slowly, final and satisfactory finish anticlockwise 69 degrees of turn, one is performed in night sky wonderful " the ballet in sky " .

Commander in chief make fall, turn begins formally.

When turn construction undertakes

Before turn

In turn

Turn is finished " alone tower sheet turns, " namely " lapidary " model compressed shape.

"Alone tower sheet turns " namely " lapidary " model compressed shape advocate the tower undertakes building at the direction of railroad with parallel first, make advocate the least space of railroad of tower tower distance increases to be close to 20 meters from 6.5 meters. Advocate after tower construction is finished, again place turn arrives 69 degrees book the position.

Introduce according to project manager Li Chuan, with before " tower bridge turns in all " different, this kind " alone tower sheet turns " alive bound still is belonged to in the inclined construction that play the bridge first, and difficulty is tremendous.

Regard the people's livelihood of Longyan city key as the project, longyan big bridge advocate bridge design is (190 ＋ 150) rice asymmetry aperture is crossed alone Liang Xie of box of steel of side of tower double demand plays the bridge, advocate tower design is " lapidary " model, use structure of prestressing force ferroconcrete.

Advocate bridge work area is located in Longyan downtown the city zone, invade 1/3 wadi north, xiang Na is invaded 1/2 have way already, east adjacent has railroad line twice already, construction site is narrow, construction difficulty is tremendous, the line of Long Zhanggao iron that Longyan big bridge borders is special railway line of Ⅰ class passenger transport, have course of nearly 120 train everyday.

According to groovy construction method, advocate railroad is apart from when tower construction the distance is not worth 6.5 meters recently, and advocate line of railroad of tower tower above is close 110 meters, construction work and railroad move to create a risk easily.

To ensure construction safety, project ministry holds technical analysis to meet for many times, case of the other side undertakes optimizing an analysis, pass argumentation many rounds, final decision uses world initiate " level 2 turn " construction craft, in former " tower bridge turns in all " on the foundation, increase " alone tower sheet turns " , reduce risk of safety of experience iron construction substantially.

Longyan big bridge advocate the tower makes an appointment with 121 meters high, how do the turn point of view that essence of life allows a column of the tower in controlling turn process and attitude change?

For this, the project surveys a group, shift to an earlier date plan, prepare adequately, in advocate set beforehand in tower construction process measure prism, every phenomenon prism is installed in cat head, ensure but much angle is accurate measure. Forecast before turn, global head stage is used to learn complete station appearance automatically when turn -- Lai blocks TS60, have brand-new technology of ATRplus automatic collimate, 0.5 seconds exceed high accuracy nicety to detect, whole process essence dogs definitely monitoring advocate tower turn data, escort the Emperor for turn quality and safety convoy.

Introduce according to project manager Li Chuan, 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.

To assure the balance in turn process, project personnel spends the balance strictly when ball bore with a reamer is installed control to be in 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, precautionary gale is adverse influence; This is explicit tower is irrigated when building construction, still undertake be irrigatinged symmetrically building to special place, ensure advocate the tower shapes attitude.

This " alone tower sheet turns " after finishing, big bridge will undertake roof beam of bridge floor box works. After bridge floor installation is finished, advocate the tower connects bridge floor again whole " 2 turn " 21 degrees, give priority to the bridge complete be open to traffic established shut, big bridge 2020 solid base.

After big bridge builds be open to traffic, will shorten greatly distance of the city zone of Longyan town north and south, accelerate Longyan city unifinication to build, to area of aid of sea west longitude infrastructure is built, region economy coordinates development to have important sense.

As we have learned, the project is in construction process, besides " two turn " outside, still overcame a lot of difficulty. Longyan big bridge advocate karst of tower construction area develops extremely, subterranean cave, soil cave is much and complex, partial area cave is layer upon layer be well versed in, still string together rock candy calabash like a string, the largest size is equivalent to dissolve antrum plane 5.7 basketball field, dissolve pitch is the biggest height 29.6 meters, be equivalent to the height of nearly 10 buildings, picket radical construction undertakes on so flimsy terrane, be equivalent to be above egg carapace undoubtedly burrow, construction difficulty cans be imagined. Project initiate " come back dig auger classification get into, steel protects tube of entire section follow-up " construction craft, settled region of world complex karst, big diameter of exceeding operational depth embeds cliff picket to cannot become the difficult problem of aperture.

Origin: People's Daily client carries Fujian channel