Sanchahe Bridge

Sanchahe bridge is located in a high mountain gorge with an altitude of more than 3800 meters. The bridge deck is 54.1 meters away from the valley bottom. It is the tallest bridge on the Qinghai Tibet railway.

The whole bridge is magnificent and the scenery on both sides is magnificent. In order to protect the Tibetan antelope, we specially designed to facilitate the migration of Tibetan antelope.

Sanchahe Bridge

Sanchahe bridge is located in a high mountain gorge with an altitude of more than 3800 meters, with a total length of 690.19 meters and a bridge deck 54.1 meters away from the valley bottom. It is the first high bridge of Qinghai Tibet railway, Sanchahe super large bridge

brief introduction

Sanchahe bridge, the tallest bridge on Qinghai Tibet Railway with 52 meters high piers. Sanchahe bridge is located in a high mountain gorge with an altitude of more than 3800 meters, with a total length of 690.19 meters, and the bridge deck is 54.1 meters away from the valley bottom. It has a total of 20 piers, of which 17 are circular thin-walled hollow piers, and the thinnest part of the top wall of the pier body is only 30 cm. The builders of Sanchahe bridge, the tallest bridge on the Qinghai Tibet railway, challenged the forbidden zone of life, overcame construction difficulties, and ensured the smooth construction of the Qinghai Tibet railway. Recently, they were awarded the "youth Contribution Award for national key project construction".

Preliminary design and discussion

According to the topography and geological conditions of Sanchahe bridge, the scheme of high pier long-span continuous rigid frame bridge with main span of 230m is preliminarily designed. The static, stability and seismic analysis of the main bridge are carried out by using finite element software. The results show that there are still some problems in the scheme of 230m main span rigid frame bridge, which need further study, The research results of this paper can provide a useful reference for the design of other bridges of the same type, Title: China Science and technology information, volume (issue): 2009 (10) classification No.: U4 key words: external prestressing of high pier and Long Span Rigid Frame Bridge, machine standard classification No.: X22 tu7 Research results of finite element software for improvement scheme of high pier and long span continuous rigid frame bridge of Sanchahe super large bridge preliminary design problems seismic analysis stability main bridge external bridge static results geological topography

Construction record

On August 30, 2002, the last piece of beam fell steadily on the Sanchahe bridge on the Qinghai Tibet railway, which announced that the key and difficult control project of the Qinghai Tibet railway and the highest bridge of the Qinghai Tibet railway, the Sanchahe bridge, were officially paved, ensuring the smooth extension of the Qinghai Tibet Railway to Lhasa.

Challenge time limit

The 690.19m long Sanchahe bridge is the tallest bridge along the Qinghai Tibet railway, with the highest pier of 54.1m and the highest building height of 85.6m. The bridge has 20 piers in total, 17 of which are thin-walled hollow piers. The bridge is located at the northern foot of Kunlun Mountain, with an altitude of nearly 4000 meters. High cold, low pressure, lack of oxygen, strong wind, rainstorm, strong ultraviolet radiation, earthquake and so on threaten the construction at any time. After four or five o'clock in the afternoon every day, there will be a gale of force five or more on the construction site, and the construction of more than 50 meters high pier can only be stopped. Sanchahe bridge is a key and difficult control project of Golmud Lhasa section of Qinghai Tibet railway, which is directly related to whether the Qinghai Tibet railway can be smoothly paved from Golmud to Lhasa. On August 22, 2001, the bridge foundation constructed by the third company of China Railway 14th bureau group was drilled for the first time. At that time, it was required that the main works of the bridge must be completed in July 2002! However, after investigation, relevant experts believe that it will take two years to build such a huge bridge with concrete pouring capacity of more than 30000 cubic meters, even in the mainland where conditions are better. Due to the lack of technology and experience in the construction of high cold railway bridge in China, the initial construction progress of the bridge is slow. By the end of October last year, the bridge had only completed more than 80 linear meters. At this rate, it will not be ready even by the end of 2002. The construction of the Sanchahe bridge has attracted great attention from the Qinghai Tibet railway construction leading group of the State Council and the leaders of the Ministry of railways. Since the construction of the Qinghai Tibet railway, Zeng Peiyan, leader of the Qinghai Tibet railway construction leading group of the State Council and director of the State Planning Commission, has made five special visits to the construction site of the Sanchahe bridge. In the tense stage of bridge construction, the project department reports to him every three days. This is the only one in the construction of the Qinghai Tibet railway. Facing the tight construction period of Sanchahe bridge, the project department changed the original construction scheme decisively, established the network diagram of construction plan, and each process was accurate to hours. At a critical moment, Liu Guanghe, 46, deputy general manager of the third company of China Railway 14th bureau group, was assigned to the Qinghai Tibet Plateau as the company's Qinghai Tibet railway project director. There are only nine months left at this time, and the bridge has just poured a completed abutment, and the pier construction has not yet started. The pressure quickly passed on to every employee. According to the network planning technology and operational research principle, they established a set of double code ring construction plan network diagram. That is to close the back door of the total construction period of the bridge, divide the 20 piers into 20 to 30 working procedures respectively, and determine the construction time of each working procedure one by one in combination with the construction level and process intersection. The whole construction network is densely distributed with thousands of nodes, just like a spider web shrouded in the bridge, each employee occupies an indispensable node. In order to ensure the completion of the node, the project department has set up a bridge contracting group. The original construction scheme was greatly adjusted and the turnover construction was abandoned. In order to increase the height of one-time pouring concrete, they invested 10 million yuan and customized 6 sets of Hollow Pier Formwork and solid pier formwork.

Challenge the limit of winter construction

In winter, the Qinghai Tibet Plateau is cold and snowy. The extreme temperature at the construction site of Sanchahe bridge reached minus 33.6 ℃. The former busy construction site of the Qinghai Tibet railway is now quiet. On November 19, 2001, the Qinghai Tibet Railway headquarters of the Ministry of Railways required that the pier construction should be stopped after winter, and most of the projects were shut down one after another. Liu Guanghe pointed out that even if there is no work stoppage in April, it will be very tight to ensure the completion of the main works of the bridge in July 2002. The suspension of work is no doubt adding insult to injury. However, in the ultra-low temperature and high cold railway bridge concrete pouring construction at minus 20-30 degrees Celsius, it is a worldwide technical problem, and there is no experience to learn from. The project department has set up a technical team with chief engineer Liang Lewen, deputy chief engineer sun Xiaomai and technical personnel Zhang Shanzhen, Zhang peihui, sun Mingyao as the main technical members to carry out scientific and technological research. Finally, they determined the winter construction plan of "setting up warm shed, steam curing, controlling temperature difference, strengthening measurement, improving technology and reasonable layout". Experts from the Qinghai Tibet Railway General Command of the Ministry of Railways unanimously agreed and approved the plan after demonstration. They have become the only winter bridge construction project along the Qinghai Tibet railway. Thus, it is the first time for the winter concrete pouring construction of railway bridges in the world. The project department adopts the latest scientific research achievement of China's Alpine Railway - low temperature early strength durable high performance concrete. In the production process, DZ admixture, which was successfully developed in our country, was used for the first time. It not only made the strength of the mixed concrete meet the design requirements, but also ensured that the concrete would not be frozen within 24 hours of pouring. Relying on strict insulation measures and advanced construction technology, the project department has achieved great success in winter construction. According to statistics, during the whole winter construction period, the project department completed a total of more than 590 linear meters of the bridge. After testing, the qualified rate of the project is 100%, and the excellent rate is more than 95%.

Related news

On the morning of August 21, the Sanchahe bridge on Dapan line was opened to traffic. There was a sea of people on both sides of the Sanchahe section of the Liaohe River. Thousands of people from Haicheng City and Dawa County gathered here to celebrate the opening of Sanchahe bridge on Dapan line. With the sound of gun salute, a car slowly drove by the bridge, the crowd on both sides of the bridge broke out bursts of excited cheers, celebrating the formal completion and opening of the bridge. Sancha River is the meeting place of Liaohe River, Hunhe River and Taizi River. It is located at the junction of Haicheng City and Dawa County, where Dapan highway passes by. The traffic location is very important. For many years, the cross-strait traffic has been maintained by floating bridges, which is neither convenient nor safe. The construction of Sanchahe bridge has solved the problem of traffic development for many years. The bridge was built by Benxi highway engineering office. The ground was broken on December 17, 1999 and completed on July 31 this year. It is located between Bajiazi village, Xisi Town, Haicheng City and guchizi Township, Dawa County. The total length of the super large bridge is 8.95 km, of which the main bridge is about 1.66 km, the approach bridge on one side of Haicheng City is 3.96 km, and the approach bridge on one side of Dawa County is 3.33 km. The pavement of the project is a secondary highway standard, and the total investment is 132 million yuan. The completion and opening of the Sanchahe bridge not only solved the bottleneck section of the highway in our province, but also eliminated the last ferry in the main highway network of our province.

Address: Golmud City, Haixi Mongolian and Tibetan Autonomous Prefecture, Qinghai Province

Longitude: 94.392365776161

Latitude: 35.8877243

Chinese PinYin : San Cha He Te Da Qiao