Introduction of Luokou Yellow River Railway Bridge?

Luokou Yellow River Railway Bridge, located in the north of Jinan, is a river-crossing bridge on the Jin-Pu Railway. The Luokou Yellow River Railway Bridge is a witness that the world powers plundered China's sovereignty in modern history.

After the completion of the bridge, this place has become an important transportation hub from Beijing and Tianjin in the north to Shanghai and Nanjing in the south. Because of this, the railway also suffered serious trauma during the war. After the founding of New China, the people's government carried out a comprehensive technical transformation of the Jin-Pu Railway, and vigorously carried out bridge reinforcement and line maintenance and expansion. The transportation efficiency was significantly improved and the transportation capacity was continuously expanded, which played an important role in the recovery and development of the national economy.

work progress

Survey and design

1899 After the signing of the grass borrowing contract for the Jin-Pu Railway in May, the German Meng 'an Bridge Company chose the bridge site for the railway crossing the Yellow River. From 190 1, three years' investigation and comparison have been carried out within 90 kilometers of the upper and lower reaches of the Yellow River near Jinan, and it is considered that it is more suitable to build a bridge in Luokou Town, and it is planned to build a bridge in Luokou Town. On August 1908 and 12, German Meng 'an Bridge Company and the General Administration of North Section of Jinpu Railway formally signed a contract to build the Yellow River Bridge.

When the project was about to start, Ding Dayi, a highway engineer in Shandong Province, considered that the pier blocked water after the bridge was built, which would easily cause hidden dangers in river defense, and asked the German Meng 'arn Bridge Company to increase the span of bridge opening and reduce the pier, although many consultations failed. 1908 12.30, the Ministry of Posts and Communications sent Zhan Tianyou, consultant, China railway engineering expert and chief engineer of Beijing-Zhangjia Railway Bureau, to Jinan for coordination. After arriving at the economy, we first went to Luokou to investigate, and learned about the dangerous situation and hydrological changes in these years in detail, and discussed with all parties many times. Considering the economic bearing capacity at that time, we decided to adopt the method of "reducing pier, expanding bridge opening and strengthening dike body" to unify the opinions of both sides. After that, the bridge type was modified five times. 65438+ full bridge 12 hole determined in the second half of 0909; There is enough navigation space under the beam. The general water potential on the water surface is 0/0m away from the truss beam under the bridge/kloc-0, and the large water potential is 7m.

Laying a single line on the bridge leaves room for laying a double line, but the truss needs to be reinforced separately when laying; The load is e-35; According to the earthquake intensity of 7 degrees.

Engineering construction

Jiangbei floodplain is wide, with 8 simply supported steel trusses with a span of 91.5m; The beach on the south bank of the river is narrow, with simply supported steel trusses with spans of 1 and 9 1.5m: there are 3-hole steel trusses above the main channel; The left and right holes are anchor arm beams with a span of 128. 1 m, which extend 27.45 m across the pier to the middle hole to form an outrigger. The outrigger is connected with a cantilever beam with a span of 109.8 m through a swing hinge to form a hole with a span of164.7 m. The total weight of the steel truss beam is 8625 tons.

Starting from the north bank, pier 1 ~ 7 and the north and south abutment are reinforced concrete piles, which are driven by steam jet grouting pile machine, with a total of 1270 piles. During the construction, the "lever method" is used to test the load of piles, and the bearing capacity of each pile reaches 150 tons, which is twice the design bearing capacity. Pier No.8, No.9, 1 1 are pneumatic caissons for pile foundation, and pier No.0 10 is pneumatic caisson foundation, and caissons are sunk by internal excavation method. In order to avoid flooding, wooden row piles were built around four piers, iron piles were used at corners, excavated in the piles, filled with stones, and then the piles were capped with cement.

The piers and abutments above the whole bridge foundation are all poured with concrete, and the surface is inlaid with stone.

191211month, the bridge was completed. The cost is 65,438+0,654,38+0,658,893 Deutsche Mark, which is equivalent to 4,545,600 kuping silver at that time. 1912165438+1October 28th, Depp Maitreya, chief engineer of the general administration of the northern section of Jinpu Railway, was responsible for the acceptance. After checking the tracks and bridges, they all meet the design standards. When testing the bearing capacity of the bridge, the original "scratch method" and "von Sieloff measuring instrument" are adopted, and each hole can meet the design requirements. On the 29th, Daqiao Company officially delivered it to the General Administration of North Section of Jinpu Railway for management. At this point, the entire line of the Jinpu Railway was connected, ending the situation that the Yellow River was divided into two parts.

After the founding of the People's Republic of China, the bridge has been inspected, maintained and repaired by the work area led by Luokouqiao of Jinan Works Section of Jinan Bureau.

Building structure

The length of Luokou Yellow River Railway Bridge is 1236.00m, the span is 12, and the span arrangement is 64m+7× 91.5m+128.1m+164. The width of the bridge deck is 1 ~ 4 holes 6.2m, 5 ~ 12 holes 10.4m, the elevation of the bridge deck is 37.33m, the maximum span of the main bridge is 164.7m, the elevation of the lower chord of the bridge is 35.63m, the piers are triangular, and the bridge structure is steel truss girder. Among them, holes 1 ~ 8 and 12 are simply supported through truss beams, and holes 9, 10 and10 are three-link suspended through truss beams. The total weight of the bridge is 8784.6t, and the design load is moderate. 3 The connecting tunnel line is a flat road, and the rest are ramps of1150. 1992 north hole 4 was demolished, 1999 was raised.

This bridge crosses the Yellow River levee in the way of level crossing. In order to ensure the smooth flood control and emergency rescue of the Yellow River, an auxiliary road is built on the north side of the left bank diversion levee and the riverside side of the right bank.

Important significance

Although Luokou Yellow River Railway Bridge is still in normal use, it has been listed as the seventh batch of national cultural relics protection units. In their spare time, many citizens, while visiting the "Jinan Baili Yellow River Scenic Area" on the south bank of the Yellow River, overlook the Luokou Yellow River Railway Bridge, appreciate its majestic posture and recall its vicissitudes. Luokou Yellow River Railway Bridge has become a good place for people to mourn history and appreciate the scenery of the Yellow River.

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