Introduction of Yongbao Bridge in Yunnan Province?

Yongbao Bridge spans the Lancang River. The main span is a through 80m ribbed arch bridge, with 2x24m continuous beam on the east bank and 1 span 18m inclined beam on the west bank. The bridge is a through ribbed arch bridge with flexible longitudinal beams, and the thrust of the main arch ring is transmitted to the abutment on both banks respectively. Axial force of inclined beam supporting arch on Baoshan bank. The vertical force of the main arch of Yongping bank is supported by the pier; The horizontal thrust is transferred to the rock foundation behind the abutment through the double-hole continuous beam. Therefore, the main arch ring and continuous beam form an arch beam structure. Built in 197 1.

The Yongbao Bridge in Baoshan, Yunnan Province was bombed 38 years after it was opened to traffic.

Yongbao Bridge (Yongping to Baoshan) is an important passage of National Highway 320 across Lancang River, connecting Baoshan and Yongping. It is such a main bridge built in the early 1970 s that carries the traffic dream of a generation. 1 In the afternoon, with a rumbling explosion, the whole bridge instantly fell into the rushing Lancang River. After 38 years of passage, it has successfully completed its historical mission.

A special framework, a big landscape on the Lancang River.

Yongbao Bridge has a profound historical background and unique charm, and was once a major landscape on the Lancang River. However, with the successful detonation of 1 afternoon, Yongbao Bridge finally completed its historical mission, leaving only a lot of good memories for people.

Laoyongbao Bridge was completed and opened to traffic in May 197 1. It is a main bridge of National Highway 320 (formerly known as Yunnan-Myanmar Highway and Kunwan Highway) across the Lancang River. The length of the bridge is 162m, and the main holes are 80m ribbed arch bridge on the east bank, 2x24m continuous beam and west bank 1 hole 18m inclined beam. This bridge is a through ribbed arch bridge with flexible longitudinal beams. The main arch ring and continuous beam form an arch beam structure. The main arch consists of two reinforced concrete arch ribs, each of which is prefabricated in 9 sections and hoisted by cables. The thrust of the main arch ring is transferred to the abutment on both sides respectively. The axial force of Baoshan bank is supported by inclined beams, the vertical force of main arch of Yongping bank is supported by two piers, and then the horizontal thrust is transferred to the rock foundation in the background through two continuous beams. Therefore, Laoyongbao Bridge is also the only bridge erected with this frame in Yunnan Province.

The construction of Yongbao Bridge, the traffic throat, lasted more than 4 years.

The predecessor of National Highway 320 is called Yunnan-Myanmar Highway. As one of the bridges, Laoyongbao Bridge was once an important throat and hub connecting central and western Yunnan.

A section of China-Burma Highway is located in the southwest plateau, with an altitude of about 1400-3000m. The route crosses Hengduan Mountains such as Tianzimiaopo and Gaoligongshan, and crosses Lancang River and Nujiang River. Gongguo Bridge and Chang Gan Bridge are built on Lancang River, in which Gongguo Bridge is a 88.55-meter stiffened suspension bridge in wood truss. Chang Gan Bridge is a steel tower stiffened steel truss suspension bridge with a span of1.35m..

Huitong Bridge, built on the Nujiang River, is a suspension bridge with suspended cables, with stiffening wood truss structure and a span of 87.23 meters. The Yunnan-Myanmar Highway was an important international transportation trunk line in War of Resistance against Japanese Aggression period. After the founding of New China, the China section of Yunnan-Myanmar Highway was renamed Kunwan Highway on 1966. After continuous reconstruction, it has gradually become an important national trunk line in the southwest frontier, and the original Gongguo Bridge and Huitong Bridge on the trunk line have also been transformed into new bridges. Gongguo Bridge was rebuilt into a through reinforced concrete rib arch with a span of 80 meters and renamed as Yongbao Bridge.

According to an old traffic man, it took more than four years to complete the main project of Yongbao Bridge at that time, and a generation of traffic people at that time also paid a lot for it. After the Yongbao Bridge was completed and opened to traffic, it also realized the traffic dream of their generation.

Will be submerged to build a new bridge instead of the old one.

The old Yongbao Bridge will be flooded due to the impoundment of Xiaowan Power Station downstream, and the National Immigration Bureau began to plan to build a new bridge to replace the old bridge that will be flooded.

Xinyongbao Bridge belongs to one of the largest bridge construction projects in the upper reaches of Xiaowan Power Station. It is located at K0+345 of Baoshan National Highway 320 rerouting project, which is designed to cross the Lancang River.

The bridge belongs to the inundation reconstruction project of Xiaowan Power Station reservoir area, and it is also an important channel for cascade development in the middle and upper reaches of Lancang River, development of Nujiang River basin and transportation of light and heavy goods. The bridge type is designed as a continuous steel bridge, with a bridge length of 280m, a deck width of 10m, and a vehicle load grade of Highway -II. Considering the needs of hydropower development and heavy and heavy cargo transportation, the total investment is about 30km/h according to the load of 300t special flat trailer.

The whole blasting bridge body fell into the river and disappeared instantly.

After the completion of the new bridge, Laoyongbao Bridge has gradually completed its historical mission. Because the bridge body of the old bridge will be below the waterline after the Xiaowan Hydropower Station is impounded, the old bridge that could have been preserved as a site has completely lost its function. In order to meet the navigation needs of the Lancang River after the storage level of Xiaowan Hydropower Station rises, the Longyang District Government decided to carry out overall blasting of the bridge body according to the requirements of relevant state ministries and commissions.

In order to ensure that the old bridge can be blown up and demolished smoothly, the Longyang District Government invited a professional blasting engineering team to enter the site to carry out blasting. According to a person in charge, in order to ensure the success of blasting, according to the structural characteristics of the old bridge, the engineering team adopted the more advanced blasting method at present, which is divided into three steps: pier blasting, bridge arch blasting and deck blasting. That is, firstly, two bearing piers are punched, filled with a batch of emulsion explosives, and then connected by flying detonators for internal blasting; Secondly, punch holes in the bridge arch, inject water and charge, and carry out hydraulic blasting; Third, connect the bridge deck with detonating tube, and then detonate the steel wire with electric detonator. Finally, the three steps are connected into a whole and the whole blasting is carried out.

After 10 days of careful preparation, at 4: 20 pm on July 2, 2009, with the command of the on-site commander, the old Yongbao Bridge was successfully blown up, and a few seconds later the whole bridge fell into the river, and the old Yongbao Bridge disappeared from people's sight.

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