Shanxi Fenyang Observation Standard Observation Nail Observation Point Observation Pile Manufacturing Factory

Description :

　　How to set up observation markers for bridge and culvert settlement observation beams?

　　【 Answer 】 (1) For prestressed concrete precast beams with stable prefabrication processes and minimal changes in raw materials, one observation marker should be set for every 30 holes. For beams with measured elastic camber greater than the design value, additional observation markers should be added for beams that have not been observed before and after, and observation should be carried out hole by hole; Observation markers shall be set up for each hole of the remaining cast-in-place beams. Pay special attention to the first 6 holes of the beam constructed with mobile formwork to verify the accuracy of the preset arch of the support. After verifying that the design requirements have been met, one observation mark can be selected for every 10 holes. For beams with measured elastic camber greater than the design value, additional observation marks should be added for beams that have not been observed before and after, and observation should be carried out hole by hole.

　　(2) Six observation markers are set up on a single hole beam of a simply supported beam, located at the support points on both sides and at the mid span; Observation markers on continuous beams are set up near the pivot point, mid span, and 1/4 mid span of the side span according to different spans. The layout points for mid spans of continuous beams with more than 3 spans are the same.

　　(3) There is no creep in the steel structure bridge beam. In order to observe deformation, 6 observation markers are set up for each hole, respectively at the fulcrum and mid span.

　　(4) For special structures such as large-span bridges, the design unit should independently develop a deformation observation plan and conduct observations according to the design plan.

　　The above content is compiled based on the problems encountered by students in their actual work, for reference only. If there are any problems, please communicate and correct them in a timely manner.

　　On the evening of February 7th, the men's 1000m short track speed skating competition in Beijing was held at the Capital Sports Center. After a fierce competition, Chinese athletes Ren Ziwei, Li Wenlong, and Wu Dajing won the championship, runner up, and fourth place respectively. This is the second medal won by the Chinese sports delegation at this session.

　　In the final, three Chinese players teamed up to compete against the brothers Liu Shaolin and Liu Shaoang from Hungary. Gunshots rang out, and Wu Dajing and Liu Shaoang were in their respective positions. However, halfway through the race, the competition was suspended due to safety reasons as there were blades on the ice. Repairing the ice and resuming the race, despite having exhausted a lot of physical strength, the three players of the Chinese team demonstrated the spirit of sincere unity and brave struggle. Ren Ziwei and Wu Dajing took turns leading the skating, and Li Wenlong was also working hard to cooperate.

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