10 years later, the Bridge Bureau surveyed and designed the bridge site again, and submitted the investigation report on the construction of Jiujiang Yangtze River Bridge at the end of 197 1. The report recommended Baishui Lake Bridge site as the first choice. 1On June 24th, 972, the Ministry of Communications submitted the Design Task Report of Jiujiang Yangtze River Bridge and Hejiu Railway to the State Planning Commission, which was approved the following year. The Bridge Bureau is responsible for the design and construction of the bridge. At first, it was decided to adopt the single arch scheme, and the span of the main navigation hole was162m+216m+162m. Later, due to the geological reasons of individual piers, the bridge scheme was revised. The revised scheme was approved by the State Construction Committee, and the main navigation hole of the main bridge was changed to a three-arch scheme of180m+216m+180m. From 65438 to 0959, the Fourth Survey and Design Institute of the Ministry of Railways chose two schemes: Jiujiang Suojiang Tower and Jinjipo Jiujiang Yangtze River Bridge. 1960, according to the opinions of the Ministry of Railways, the Bridge Bureau conducted extensive geological drilling on Wuxue, Jinjipo, the left bank of Suojiang Tower and the downstream of Jinjipo in Jiujiang, and finally selected the Baishui Lake bridge site scheme between Suojiang Tower and Jinjipo in Jiujiang. On June 25th, 1960, the plan was submitted to the Ministry of Railways and approved. Baishuihu Bridge has a moderate route position, straight river course, deep flood line to the south, straight and stable, with little change and good shipping conditions. The bedrock is relatively complete, with high strength and small water depth. It can be used in the hilly area on the south bank, and the approach bridge can be shortened. It is in a moderate position with Jiujiang City, and there is little demolition on both sides, which is beneficial to urban development. At the same time, the local shipping, transportation and military departments of provinces and cities all agreed to the bridge site. In order to find the ideal geological conditions and cooperate with the comparison of lead strike in the south bank, three middle lines were further determined in the 300-meter-wide river surface in Baishui Lake area for exploration and comparison, and finally the existing middle line of the bridge site was selected. The north bank of the bridge site is Xiaochikou Town, Huangmei County, Hubei Province, with flat terrain. The central line of the south bank passes through Baishui Lake and a hill named Cao Jiashan. The distance between the existing dikes on both banks is about1960m. The maximum construction depth of Baishuihu Bridge site is about 25 meters.
Jiujiang Bridge is a double-deck railway and highway bridge. The railway bridge is 7675 meters long (903 meters longer than Nanjing Bridge) and the highway bridge is 4460 meters long. Main bridge steel beam 1860m (230m longer than Nanjing). The lower layer of the main bridge is double-track railway and the upper layer is expressway. The highway is four lanes, with a width of14m, and sidewalks with a width of 2m on both sides. The main bridge has a 1 1 steel beam, and there is a 10 pier in the river, with a maximum span of 216m, with a bridgehead on each bank. The bridge type consists of two continuous trusses of 3× 162m, a rigid truss of 180m+2 16m and a continuous truss of 2× 162m from north to south. The truss width is 12.5m, the truss height is 16m, the stiffening leg height is 14m and 16m respectively, and the heights of the three arch types are 24m, 32m and 24m respectively. The steel beam of the main bridge is made of high-strength steel 15 Mn-V-N steel, the maximum thickness of steel plate is 56 mm, and the bridge is welded into bars. The on-site connecting bolts are high-strength 35 V-B steel bolts with a diameter of 27 mm, and the weight of the whole bridge steel beam is 30,000 tons.
There are 35 holes on the south bank and 0/09 holes on the north bank of the railway approach bridge, totaling 144 holes, all of which are ballastless and pillowless prestressed reinforced concrete simply supported box girders with a span of 40 meters, and each hole has two single boxes. There are 33 holes in the south bank and 32 holes in the north bank of the highway approach bridge, totaling 62 holes, all of which are prestressed reinforced concrete T-beams with a span of 40 meters and 8 pieces in each hole. 1972 the second and fifth bridge engineering departments of the bridge bureau are ready to enter the site, and they are stationed in the north bank and south bank for relative construction. And set up a new ship management office to cooperate with these two engineering institutions to carry out water engineering business. In order to strengthen the leadership in the construction of Jiujiang Bridge, the Jiujiang Yangtze River Bridge Engineering Command of the Bridge Engineering Bureau was established, and the South Bank Engineering Command of Jiujiang Yangtze River Bridge was established in Jiangxi Province to coordinate local relations. After more than one year of construction preparation, Jiujiang Yangtze River Bridge officially started construction on February 26th, 1973+65438. Four foundation forms are adopted, namely, reinforced concrete open caisson foundation, floating steel open caisson bored pile foundation, steel sheet pile cofferdam concrete column foundation and double-wall steel cofferdam bored pile foundation. In the construction of deep water foundation, the construction of bored pile foundation with double-walled steel cofferdam initiated by Xin Chen and Su Jie was successful at No.7 pier, and was subsequently adopted at No.6, No.5 and No.3 piers. Due to the adoption of this construction method, it is not affected by the change of water level in the Yangtze River, and the construction is carried out as usual in flood season, which shortens the construction period and creates a new record for the construction of deep-water wharf in dry season. In the foundation construction under the bridge, it is the first time in the history of bridge construction in China to use a 2.5-meter-diameter reverse-circulation rotary drilling rig to help dig deep wells with mud liners and air curtains. 10 In June, 1975, the Ministry of Railways approved the construction of the underwater main bridge10 pier. At this point, the bridge construction has entered a comprehensive construction stage. 1979 bottom, main pier and abutment are basically completed.
There are more than 3,000 cadres, experts and workers in the Survey and Design Institute of the Bridge Bureau and the Engineering Department of the Second and Fifth Bridges. 1974 The total estimated budget of the whole bridge by the Ministry of Communications was 270 million yuan. 1986 the substructure and approach bridge of the main bridge for both sides of the Taiwan Straits were completed, with an accumulated investment of 236 million yuan. 1979 After the completion of the pier of the main bridge, due to the national policy of "adjustment, reform, rectification and improvement", the railway construction plan was adjusted accordingly and the construction of Jiujiang Bridge was postponed. In order to prevent the construction of Jiujiang Bridge from being interrupted, the state allocated some funds to slow down the construction, which lasted for eight years.
1986165438+1On October 27th, the State Council Vice Premier Wan Li inspected Jiujiang Bridge site. Looking at the Yangtze River, 10 pier stands in the rolling river, and time is like water. The erection of the steel beam was delayed, and he was very heavy-hearted and instructed to start building the bridge. From 65438 to 0987, the State Planning Commission called the Ministry of Railways, the Ministry of Communications and Jiangxi, Hubei and Anhui provinces to raise funds to speed up the construction of Jiujiang Bridge and take the lead in opening highways. At that time, the unified command and leadership of Jiujiang Yangtze River Bridge Headquarters was re-established, with Li Yingcang as commander and party secretary, and Zhao Yucheng as deputy commander and chief engineer. With the care and support of the CPC Central Committee, the Jiujiang Yangtze River Bridge, which was suspended for nearly 10 years, finally began to be continued. 1May, 989, the main bridge steel beam was installed. The erection method is to use beam cranes with lifting capacity of 35 tons on both sides of the river, and cantilever assemble them from the shore hole by hole until the center of the largest main span is 2 16 meters. There are large floating cranes with lifting capacity of 3000-5000 tons abroad, which can be used to erect beams, but this kind of floating crane can't be driven into inland rivers. The builder of the bridge adopted a large sling tower, and used front and rear stay cables to reduce the installation stress of cantilever holes and anchor holes, thus realizing the full-span cantilever installation of 162m and 180m. The double-layer pylon is 52.43 meters high and weighs 933.98 tons. The inner cable bearing capacity is 1.200 tons, and the outer cable bearing capacity is 800 tons. It is the key equipment for erecting long-span steel beams. It was manufactured by the Bridge and Ship Management Office and assembled on the north shore in June 1990. On June 28th, cantilever assembly of 162m span steel beam began. By the end of 1990, the erection of the five-hole steel beam of the main bridge on the north bank was completed; There are four scaffolding for the steel beam at the 1 1 hole on the south bank. The beam is on the scaffolding for 72m, and then reaches the pier at 10 on the cantilever for 54m. At 8: 40 on May 1992, the bridge was successfully closed. On August 9, 2008, the closure of three steel arches was completed.
1992, the Bridge Bureau completed the supplementary preliminary design of Jiujiang Bridge deck and other ancillary facilities, and passed the appraisal in 1993. The expressway was opened at the beginning of 1993. So far, the project has been under construction for 20 years. 1In August, 1994, a double-track common rail was paved to allow engineering trains to pass at a limited speed, and then a seamless track was paved. In June, 1995 and 1 were officially put into operation. It plays a key role in the north-south connection of Beijing-Kowloon Railway. During the 20-year construction of Jiujiang Yangtze River Bridge, the Bridge Bureau gave full play to the enterprise advantages of "design, scientific research, construction and manufacturing" and adopted advanced bridge construction technology, creating ten national firsts and winning many national awards, which made remarkable contributions to the development of bridge construction and scientific and technological progress in China.
This railway bridge is 7675 meters long, which is the longest bridge on the Yangtze River. With a span of 216m, the steel beam is the largest railway-highway bridge in China and the largest fully bolted bridge in China. The steel beam is made of 15 Mn-V-N high-strength steel and welded with 56 mm thick plate, ranking first in China. The steel beam connection adopts large-diameter 27 mm high-strength bolts with a pre-tightening force of 30 tons. It was first used on railway bridges, the highest in China. The installation of steel beam adopts double-layer sling tower with full extension arm to install steel beam, with a span of 180 m, which is the first in China and has the international advanced level; The stiffening leg truss beam spans 216m, and the three flexible arches are closed, which is the first time in China. The foundation structure adopts double-wall steel cofferdam drilling foundation, which was initiated by China and won the 198 1 National Excellent Design Award. It is the first time in China that the floating box foundation with complex geology and weak stratum. The foundation construction adopts mud jacket and air curtain to sink the well 50 meters, which is the largest bridge in China and is used for underwater foundation for the first time. In the bridge approach project, the 40-meter-span three-section ballastless and ballastless prestressed box girder is adopted for the first time. The special box girder bridge erecting machine weighs 300 tons, which is the highest in China.
1997 The new technology of Jiujiang Yangtze River Bridge on Beijing-Kowloon Line won the ministerial-level scientific and technological progress award of the Ministry of Railways. Among them, the main completion units are Bridge Bureau, Research Institute of Ministry of Railways and Shanhaiguan Bridge Factory, and the main completion personnel are Fang Qinhan, Zhao Yucheng, Li Yingcang, Shao, Wan Fang, Cao Chunyuan, Wu, Liu Zengda, Pan, Yan, Zhang Bijing, Gao Dechun, Yin Wanshou, Hua Youheng and Gu Jinjun. In particular, Jiangxi experts Pan and Pan Jiluan have made outstanding contributions to solving the welding technical problems of the 56mm thick plate of the bridge.