【Daily Question】【Civil Engineering Version 20180618】
Thread Content
Which of the following basic regulations regarding the installation and removal of formwork is correct? ( ) A. The U-shaped clamps on the same joint should not be tightened in the same direction. B. Steel ribs should be used as whole members; joints should be arranged alternately, and the overlap length should not be less than 300 mm. C. When setting up the formwork, using a pre-assembly method can speed up construction, improve efficiency and the quality of formwork installation; however, appropriate lifting equipment and a sufficient assembly area are required. D. When removing the formwork, once the concrete strength exceeds 1.2 N/mm², the side formwork should be removed first, followed by the load-bearing formwork. E. The sequence and method of removing the formwork should follow the specifications outlined in the formwork design, adhering to the principles of removing elements in the order they were installed, starting with non-load-bearing parts before moving on to load-bearing parts, and from top to bottom. Answers: ACE 【Explanation】When installing formwork, the following requirements must be met: ① The U-shaped clamps on the same joint should not be tightened in the same direction. ②The holes for the tie bolts of the wall formwork should be aligned directly with one another; the bolts used to connect them must not be pulled at an angle or forced into place. Drilling should be done using mechanical tools; it is strictly prohibited to use electric or gas welding to create holes. ③The steel ribs should be made of complete bars, with joints placed at staggered positions; the overlap length should not be less than 200 mm. When setting up formwork, the pre-assembly method can speed up construction, improve work efficiency and the quality of formwork installation; however, it requires appropriate lifting equipment and a sufficiently large assembly area. The sequence and method of removing formwork shall be in accordance with the provisions of the slab design, following the principles of installing first and then removing, dealing with non-load-bearing areas before load-bearing areas, and working from top to bottom. First, remove the side formwork (when the concrete strength is greater than 1 N/mm2), then remove the load-bearing formwork.
. The U-shaped clamps on the same seam should not be tightened in the same direction
A. The U-shaped clamps on the same joint should not be tightened in the same direction. C. When setting up the formwork, using a pre-assembly method can speed up construction, improve work efficiency and the quality of formwork installation; however, appropriate lifting equipment and a sufficient assembly area are required. E. The sequence and method of removing the formwork should follow the specifications outlined in the formwork design, adhering to the principles of removing elements after they have been installed, starting with non-load-bearing parts before moving on to load-bearing parts, and working from top to bottom. When installing the formwork, the following requirements must be met: 1) The U-shaped clamps on the same joint should not be tightened in the same direction. 2) The holes for the tie bolts of the wall formwork should be aligned directly with one another; the bolts used to connect them must not be pulled at an angle or forced into place. Drilling should be done using mechanical tools; it is strictly prohibited to use electric or gas welding to create holes. 3) The steel ribs should be made of whole bars; the joints should be arranged at staggered positions, and the lap length should not be less than 200 mm. When setting up formwork, the pre-assembly method can speed up construction, improve work efficiency and the quality of formwork installation; however, it requires appropriate lifting equipment and a sufficiently large assembly area. The sequence and method of removing formwork shall be in accordance with the provisions of the slab design, following the principles of installing first and then removing, dealing with non-load-bearing areas before load-bearing areas, and working from top to bottom. First, remove the side formwork (when the concrete strength is greater than 1 N/m2), then remove the load-bearing formwork.