2023 second-level construction engineer municipal gold test site template, bracket and arch removal, the second construction must test points, long press to like + forward + comment for continuous updates, click on my avatar in the Wendang version and send me a private message: 2022
(1) The removal of formwork, brackets and arch should comply with the following regulations:
1) The non-load-bearing side formwork should be removed only when the strength of the concrete can ensure that the edges and corners of the structure are not damaged. The strength of the concrete should be 2.5MPa. and above.
2) The core mold and the reserved channel inner mold can be pulled out only when the compressive strength of the concrete can ensure that collapse and cracks will not occur on the surface of the structure.
3) The load-bearing formwork and brackets of reinforced concrete structure can only be removed when the strength of the concrete can bear its own weight load and other possible superimposed loads.
(2) Mortar masonry , Concrete block arch bridge arch frame removal should comply with the following regulations:
1) Mortar masonry and concrete block arch bridge should remove the arch frame after the mortar strength reaches the design required strength. When the design does not specify, the mortar strength should reach more than 80% of the design standard value.
(3) The removal of templates, brackets and arches should follow the principle of supporting first and then dismantling, and then dismantling the last support first. The brackets and arches should be removed in several cycles, and the removal amount should be from small to large. In each cycle, they should be discharged simultaneously in the horizontal direction and symmetrically and evenly in the longitudinal direction. The formwork of simply supported beam and continuous beam structures should be removed sequentially from the mid-span to the support direction; the formwork of cantilever beam structure should be removed sequentially starting from the cantilever end.
(4) The side formwork of a prestressed concrete structure should be removed before prestressed tension; the bottom formwork should be removed after the structure is established prestressed .
[Rule] Preloading, concrete pouring, and formwork removal are in the same order
Large deformation → Small deformation
[Example - Single choice] Regarding the removal of formwork of prestressed concrete structures, the correct statement is ( ). 【2019】
A. The side formwork should be removed before prestressed tensioning
B. The side formwork should be removed after prestressed tensioning
C. The removal of the formwork should follow the principle of supporting first and then dismantling, then supporting and then dismantling
D. The formwork of the continuous beam structure should be removed cyclically from the support to the mid-span direction
[Answer] A
