Site selection of the new Leiyang Bridge. The main bridge is 322 meters long and 3 1 m wide, which is equivalent to three times the current width, and it is the widest bridge across lightning water at present. The bridge deck adopts the first-class highway standard, with two-way six lanes, and the navigation holes are in accordance with the requirements of the fourth-class waterway. The construction period is 30 months, and the whole bridge reconstruction project will be implemented in three stages. The first step is to build a temporary steel bridge so that pedestrians and motorcycles can pass after the bridge is demolished. It is expected to be completed in 1 month and a half after construction starts today. The second step is to demolish the old bridge by blasting and clean up all the demolished bridges. It is expected that blasting will be carried out at the end of April and cleaning will be completed at the end of May. The third step is to start the construction of the new bridge, and then dismantle the steel temporary bridge after it is completed and put into use. We will try our best to officially start this work on June 1 day, and strive to finish it before the Spring Festival of 20 17.
brief introduction
The Old Leiyang Bridge, built at 1970, is the first bridge across leishui in our city. Over the past 44 years, it has served the people's travel and economic and social development in our city, made great contributions and witnessed the development of our city. Due to years of overload use, since the bridge was recognized as a third-class dangerous bridge in 2008, the four leaders of the city have been paying close attention to the reconstruction and construction of the old Leiyang Bridge. The four leaders held several special meetings to discuss and study, and the city organized many representatives of the Municipal People's Congress and CPPCC members to conduct in-depth on-site inspections and investigations, and set up a special headquarters for the reconstruction and construction of Leiyang Bridge, with the mayor personally in charge and vigorously promoting all the work. Due to the change of the situation, the bridge reconstruction scheme has been changed and adjusted again and again. Strengthen the old bridge first, then widen the reinforced side of the old bridge, and then widen the reinforced side of the old bridge. Especially on 20 10, Leiyang bridge was re-tested and identified as a four-level dangerous bridge. After the accident of Fenghuang Bridge, the management of dangerous bridges by the Provincial Department of Transportation became stricter, and it was clearly stipulated that the fourth-grade dangerous bridges should not be reinforced and rebuilt. 20 1 1 In September, the 38th government executive meeting finally decided to demolish the old bridge and rebuild the new one, with a width of 3 1 m.. Due to the strict examination and approval procedures of the bridge, the preliminary work of the bridge took a lot of time. 2065438+May, 2003 16, the Provincial Communications Department issued two-stage construction drawing design approval, marking the completion of the preliminary work of the bridge. After a period of preparation, the official construction is ushered in today.
Site selection of the new Leiyang Bridge. The main bridge is 322 meters long and 3 1 m wide, which is equivalent to three times the current width, and it is the widest bridge across lightning water at present. The bridge deck adopts the first-class highway standard, with two-way six lanes, and the navigation holes are in accordance with the requirements of the fourth-class waterway. The construction period is 30 months, and the whole bridge reconstruction project will be implemented in three stages. The first step is to build a temporary steel bridge so that pedestrians and motorcycles can pass after the bridge is demolished. It is expected to be completed in 1 month and a half after construction starts today. The second step is to demolish the old bridge by blasting and clean up all the demolished bridges. It is expected that blasting will be carried out at the end of April and cleaning will be completed at the end of May. The third step is to start the construction of the new bridge, and then dismantle the steel temporary bridge after it is completed and put into use. We will try our best to officially start this work on June 1 day, and strive to finish it before the Spring Festival of 20 17.
Leiyang Bridge has been used for more than 40 years. In March 2008, it was identified as Grade IV dangerous bridge by the Engineering Testing Center of Hunan University of Science and Technology, and vehicles above 10 ton should be banned. Since the construction of the upgrading and reconstruction project of Leiyang connecting line of Beijing-Zhuhai Expressway, the traffic volume of Leiyang Bridge has increased sharply due to the diversion of vehicles, especially the passage of trucks and overloaded trucks, which is likely to cause major bridge collapse accidents. In order to ensure the safety of Leiyang Bridge, passing vehicles and pedestrians, the Municipal Highway Bureau informed that with the consent of the municipal government, 2.9-meter height-limiting railings were set at both ends of the bridgehead of Leiyang Bridge from yesterday to restrict the passage of ultra-high and over-limit vehicles.
Safety doors with limited height and width are attached at both ends.
Leiyang city Highway Administration organized staff to fight for five hours in the cold wind continuously, and set arch with height and width limits at both ends of Leiyang Bridge, which further strengthened the traffic safety guarantee of Leiyang Bridge.
Yesterday morning 1 1: 30, the reporter saw on the Shuidongjiang side of Leiyang Bridge that the staff of leiyang city Highway Bureau, with the cooperation of leiyang city Traffic Police Force, blocked the traffic of the bridge, hoisted the pre-made height-limiting arch with a crane and placed it in two soil pits next to the bridge. Relevant personnel shall immediately carry out electric welding operation and pour cement slurry. After more than an hour of intense work, the first arch with height and width limits was finally completely erected. The height limit sign shows that the height of passing vehicles should be below 2.9 meters and the load should be below 10 ton.
At 2 o'clock in the afternoon, the reporter saw on the side of Caizichi of Leiyang Bridge that after traffic control, the staff of the Municipal Highway Bureau carried the pre-made height-limiting arch to the designated position, and then hoisted it with a crane and placed it. The construction personnel immediately carry out the reinforcement work. At 4 o'clock in the afternoon, the placement of the arch with height limit and width limit was completed.
During the whole process, the relevant departments cooperated closely, and the traffic order was orderly, and there was no abnormal situation. Under the command of the traffic police, some over-limit vehicles quickly left the Leiyang Bridge area and found him to cross the river. While directing traffic, the staff of leiyang city Highway Bureau also issued an open letter to drivers and passengers, asking the general public to protect Leiyang Bridge. The citizens expressed their warm support for the government's action.
In the evening, the reporter also found that at both ends of the bridgehead of Leiyang Bridge, the Municipal Highway Bureau strengthened control and increased traffic management personnel on duty. The safety of vehicles and pedestrians on Leiyang Bridge has been effectively guaranteed.
Included in the provincial dangerous bridge reconstruction project.
Leiyang Bridge, the first bridge across leishui in leiyang city, was listed as a dangerous bridge reconstruction project by the Provincial Communications Department.
Leiyang Bridge is the first bridge across leishui, with a span of 309 meters. Built in 1970, it has a history of 42 years. The bridge is located in leiyang city section of S320 provincial highway. Due to many reasons, such as age and traffic congestion, the bridge has cracked in many places. In 2007, it was designated as a five-level dangerous bridge by the Provincial Communications Department, and a dangerous bridge and a load limit sign were set up.
After struggle, in 2008, Leiyang Bridge was listed as a dangerous bridge reconstruction project of large bridges by the Provincial Communications Department. The planning and design will not only transform the old bridge, but also build a new bridge next to the old bridge, and then combine the two bridges into one. The total budget investment is 50 million yuan, including 22 million yuan from the Provincial Communications Department, including 20,000 yuan for the old bridge reconstruction and 0/20,000 yuan for the new bridge construction. The gap will be matched by the local government. At present, leiyang city has started the preparatory work.
The preliminary design scheme of the new Leiyang Bridge is open for comments.
With the active efforts of Leiyang Bridge Reconstruction Project Coordination Headquarters, the survey and design work of Leiyang Bridge Demolition and Reconstruction Project started ahead of schedule. At present, the preliminary design scheme of the new Leiyang Bridge, which has attracted the public's attention, has been announced to the whole city for your valuable opinions and suggestions.
According to the preliminary design scheme provided by Shaoyang Traffic Planning Survey and Design Institute, the site of the new Leiyang Bridge is selected, with a total length of 47 1m, in which the main bridge is 3 17m, the approach bridges at both ends are 154m and the bridge width is 31m.. The deck of the new Leiyang Bridge adopts the first-class highway standard with a design speed of 60 km/h; The middle of the bridge deck is a two-way six-lane road, and a 2.5-meter-wide non-motor vehicle lane, a 2-meter-wide sidewalk and a 0.5-meter-wide guardrail are also designed on both sides. Fully considering the construction time and construction funds, the experts put forward two schemes for our city to choose from, namely, the scheme of 55m2 100m55m and the scheme of 45m380m45m (the difference between the two schemes lies in whether there are three or four piers in the river, see the renderings and explanatory materials at the back). In order to gather the strength and wisdom of the whole city and turn the new Leiyang Bridge into a landmark project that attracts the attention of the whole city, from now until June 25, the Municipal Transportation Bureau will fully listen to and solicit the opinions and suggestions of the people of the whole city, and welcome the general public to put forward valuable opinions and suggestions through letters, calls and online messages. The Municipal Transportation Bureau will carefully sort out and study the opinions put forward by everyone, provide them for experts' reference, and absorb them into the final design scheme as much as possible. The new Leiyang Bridge will be more beautiful because of your suggestion, and your wisdom will be sublimated because of the new Leiyang Bridge.
The preliminary design scheme of the new Leiyang Bridge is as follows
Design scheme 1: 55m2 100m55m prestressed concrete continuous box girder bridge (recommended scheme).
Advantages:
① majestic bridge type, single superstructure type, simple, beautiful and generous bridge type; The bridge span is symmetrically designed, with a sense of rhythm and rhythm.
(2) The cantilever casting method is adopted, which is convenient for maturity. Moreover, the number of underwater piers is small, and the underwater piers basically avoid the existing waterway position, which has the least impact on navigation under the bridge during construction.
③ The position of navigation hole is consistent with the existing navigation channel, and the clear width under the bridge meets the clear width requirement of two-way navigation hole.
Disadvantages:
Large single span and long construction period.
Scheme 2: 45m380m45m prestressed concrete continuous box girder bridge (comparison scheme)
Advantages:
① Cantilever pouring construction method is adopted, which is convenient and mature.
(2) In the case of moderate single span and sufficient construction machinery, the construction period is relatively short.
③ There are two one-way navigation holes under the bridge, which are in good agreement with the existing navigation channels, and the clear width of navigation under the bridge meets the requirements of one-way navigation.
Disadvantages:
(1) costs more.
(2) Piers 3 and 4 are located near the upstream and downstream waterways of the existing Class VI waterway, which will have a certain impact on shipping during the construction period.
③ The bridge scheme is a little stingy in aesthetics.
According to the introduction of the Municipal Transportation Bureau, the reconstruction project of Leiyang Bridge has been carried out steadily according to the law and regulations in strict accordance with the construction procedures since it started. According to the construction drawing design, the construction period of Leiyang Bridge is 30 months. From March this year 17, the superior issued the commencement order, and it was not completed until September 20 17. In the construction process, in view of the actual traffic pressure caused by the demolition of the old bridge and the strong voice of the people, after consultation with the supervisor and the construction unit, on the premise of ensuring the quality and safety, we plan to further accelerate the construction progress by increasing the input of materials and equipment and improving the construction technology, and re-formulate the construction plan confirmed by experts to be completed and opened to traffic before 201610/.
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