High difficulty technology "supports" the Taiyuan version of "Zhaozhou Bridge"

At the intersection of the construction of the second phase of Binhe East Road in Binhe East Road in Taiyuan City, a bridge flew across the banks of Xiaohe, combined with the blue water, blue sky, and green space to create a new city of urban landscapes. This bridge is the second phase of the south extension of Binhe East Road to cross the Xiaohe Bridge, and it is also the first large -span continuous arch bridge in our province. Behind it smoothly, it is inseparable from the highly difficult technical support. Recently, the reporter visited the project.

Multi -party argumentation plan for geological conditions in the riverbed

As the main road of Taiyuan City Expressway, Binhe East Road, which has passed the north and south extensions, provides great convenience for citizens to travel.

In 2021, Binhe East Road extended 15.8 kilometers south again, with a total of 7 construction bid sections. Among them, the total length of the four -standard section of construction was 1380 meters, and it was undertaken by the China Railway Twelfth Bureau Group Co., Ltd. According to the design scheme, a newly -long 982 -meter cross -Xiaohe Bridge will be built. "The main bridge of this bridge is 5 cross -continuous traditional arched bridges, 360 meters long and 43.5 meters wide. The 5 spans of the main bridge are 50 meters, 80 meters, 100 meters, 80 meters, and 50 meters." Gao Yuanzhu, the secretary of the Party branch of the Binhe East Road of the China Railway Twelfth Bureau Binhe East Road (hereinafter referred to as the "Four Bid Section Project Department"), talked about the cross -Xiaohe Bridge, and a set of data blurted out.

Since the cross -Xiaohe Bridge is a multi -span continuous bridge, from the perspective of architecture, the largest span is the main span. The main crossing construction is the most difficult and the technical requirements are the highest.

Given that the main crossing is the Xiaohe River channel and the flow of the river bed is not allowed, and the geological conditions of the river bed are poor, the construction staff cannot set up a full stand. After many demonstrations, the frame was finally determined to be the basis of bridge template brackets. From bottom to the bottom, the shelves are composed of steel pipe columns, strip foundations, Beretil beams, workers steel, plate buckles, and work steel allocation beams, square wood and bamboo rubber plates. The construction staff made the bamboo gap into the bottom of the paddling beam and poured the concrete.

New materials laid the concrete box beam into steel box beams and bridges

Crossing the Xiaohe Bridge, not only on the across Xiaohe, but also across the current situation and a high -pressure natural gas pipeline. According to the requirements, road traffic must not be interrupted, and high -pressure natural gas pipelines cannot be changed.

Chen Shunyuan, chief engineer of the four -standard section project department, actively contacted the owners and design institutes. After multi -party negotiation and communication, the design institute agreed to change the concrete box beams to steel box beams. The adjustment of this design plan means that the construction staff no longer pour concrete at the scene, but uses a hanging to set up steel box beams. The steel box beam is prefabricated in the factory and welded on site. "This kind of construction method not only has fast construction speed, but also has a small impact on traffic and natural gas pipelines." Chen Shunyuan said.

After the steel box beam is welded, the construction personnel first carried out the shot shot shot, and then the bottom paint was brushed, and then the bonding layer was laid. After the above processes are over, the construction staff lays epoxy asphalt on the bridge deck. Chen Shunyuan introduced that epoxy asphalt has excellent anti -fatigue performance, good temperature stability, good intervertened binding ability and high strength, high toughness and other characteristics. In layman's terms, this material does not flow at high temperature; at low temperature, its crack resistance is good. When the steel plate is hot and contracted, the epoxy asphalt pavement can "advance" with the steel plate, and it is difficult to occur with quality diseases.

Say "goodbye" with "expansion joint" hundreds of door holes to strengthen the landscape

In order to meet the needs of thermal expansion and contraction, a "telescopic joint" will be left on the general bridge every other distance. However, 360 meters of main bridge across the Xiaohe Bridge did not have a "expansion joint". In this case, how to avoid destruction of thermal expansion and contraction to the bridge? Chen Shunyuan gave the answer.

According to the design plan, there are more than 2,000 prestressed tooth blocks (that is, prestressed tensile end) on the main bridge across the Xiaohe Bridge, and equipped with prestressed steel bars on the bottom plate, abdomen, and top plate. "The box beam of the main bridge is a continuous whole. Despite the segmentation, there are two meters of rear -pouring segments in the middle of each section to be used in the dragon. . When the concrete is poured, they are closely combined to generate sufficient strength and stability. "Chen Shunyuan said that stability and prestressed work can not only offset internal stress, but also offset the stress passed by the load load, avoid heat expansion Cold contraction and adverse effects brought by other factors.

It is worth noting that the bridge pier across the Xiaohe Bridge has a unified door hole with a unified size, a total of 120, and it is known as the modern version of the "Zhaozhou Bridge", which enhances the landscape effect. In addition, during the construction, the four -standard section project department adopted a clear water concrete process, which made the bridge body look simple and elegant and has a historical sense of history.

Gao Yuanzhu said that the main body of crossing the Xiaohe Bridge has been completed, and the auxiliary facilities are being tense. It is understood that the second phase of Binhe East Road is expected to be completed in October this year. At that time, the total length of Binhe East Road will reach 55.8 kilometers. In addition to the time and space distance from Taiyuan City and Qingxu County, it will improve the comprehensive traffic network of the city and serve the construction of the Shanxi Comprehensive Reform Demonstration Zone. important meaning. Reporter Liang Yaohua

- END -