Cracks found on pier beams of the hottest new airp

2022-08-09
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Cracks appear on the pier beams of the new airport expressway

Guide: cracks appear on the pier beams of the expressway. The chief engineer of the relevant company said that it was caused by thermal expansion and cold contraction, not the quality problem of the viaduct project of the new airport expressway. Recently, readers reported that cracks appeared on the pier beams at the Sanyuanli exit of the Guangzhou New International Airport Expressway, about 80 cm long. Yesterday, Guangzhou Expressway

cracks were found in the pier beams of the expressway

the chief engineer of the relevant company said that it was caused by thermal expansion and cold contraction, not the quality problem of the viaduct project of the new airport expressway. Recently, readers reported that cracks were found in the pier beams at the Sanyuanli exit of the Guangzhou New International Airport Expressway, with a length of about 80 cm. Yesterday, Li Chaowen, the chief engineer of Guangzhou Expressway Corporation, told that the cap beam where the crack was located was not a stressed part, which would not affect the safety of the main structure of the viaduct there. The crack is about 80 cm long

Mr. Sun, a retired technician of Guangzhou construction machinery construction company, told that he was deeply worried about the fact that he accidentally found the crack recently

when the plastic is burned above 500 degrees, it turns into ash. We can see that the cracked pier beam is facing the Baiyun District Maternal and child health hospital. Above it is the Sanyuanli exit of the new airport expressway, and not far away is the Sanyuanli toll station. The pier beam is more than 10 meters above the ground, which is divided into pier column and cap beam, and the crack is on the cap beam at the top of the pier column in the south. Mr. Sun said that according to national regulations, the seismic level of key projects should be at least level 7 or above. However, such a large crack appeared in the pier beam at this place more than one year after its completion, and its engineering quality is worrying. There is mode 2 above the crack: in the lactone ring β- The bond between carbon and oxygen atoms breaks, which can produce enantiomers and produce a large piece of concrete. If it is not repaired, it will fall down sooner or later, which also has great potential safety hazards. On the morning of July 10, I learned about the situation from the personnel on duty at Sanyuanli toll station of the new airport expressway. A staff member said that they had just learned about the matter and had reported it to the superior department. Later, they checked some sections along the lower part of the new airport expressway and found no similar cracks

the engineer said the crack was OK

after reporting the situation to Guangzhou highway bureau, Guangzhou Transportation Commission, Guangzhou Construction Commission and other units, he contacted the new airport expressway company, and general manager Shi Yongcan was interviewed. According to Shi Yongcan, because the original location of the pier needs to occupy the road below, the single pier column was rebuilt into a portal pier beam. Recently, he visited the site several times and believed that the cap beam at the crack was not stressed and would not affect the safety of the overall structure. Yesterday afternoon, Li Chaowen, the chief engineer of Guangzhou Expressway Corporation, drew a schematic diagram at the scene to explain that there was plastic foam in the expansion joint between the pier column and the cap beam of the viaduct. Because the two were too close, the thermal expansion and cold contraction of the bridge slab pulled the cap beam, causing the cap beam to crack. Because it is time to replace the new belt, the weight of the bridge deck is pressed on the "horse leg" support of the pier column. The development history of the externally mentioned fatigue testing machine dates back to the early 19th century. After the industrial revolution, with the development of steam locomotives and motor vehicles and the extensive use of mechanical equipment, the destruction of moving parts often occurs. This is a typical phenomenon of metal fatigue, which people did not pay attention to at that time, Moreover, there is no fatigue test. The cap beam at the conceptual end is not a stressed part, so it will not have any impact on the bridge body. Cracks are common in bridge construction, not engineering quality

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