Influence of formwork construction on quality of construction project
“Formwork engineering is a general term for a series of technical work and completion of the design, installation and dismantling of forms and supports for concrete forming”, which is the definition of formwork engineering in the quality acceptance specification. The formwork play a decisive role in ensuring the geometrical appearance and appearance quality of the concrete. Any mistake in any of the above steps will adversely affect the quality of the concrete structural engineering. The current “Construction Quality Acceptance Specification for Concrete Structure Engineering GB50204-2002” lists the defects in the appearance quality of some cast-in-place structures. These defects are mostly external and can be checked by the look and feel. However, as the quality of the project, the technical personnel should understand that: such quality defects may be caused by poor quality of the forms project. If serious defects occur in the main force parts of the concrete structure, it is not allowed by the specification, and the impact on the structure is also multifaceted. Do not analyze here, the author only analyzes the influence of formwork engineering on some intrinsic quality of cast-in-place concrete members.
(a) If the mastering is poor, it is very likely that the surface of the concrete will be excessively cut, which often leads to insufficient thickness of the concrete protective layer, and even the stirrups and the main ribs are exposed. After the chiseling, the construction will apply another layer of mortar on the surface ( Leveling), sometimes for the convenience of plastering, consciously remove the bulging part to the main rib. For this treatment, everyone is used to it, but the protective layer made of mortar is no longer the protective layer in the original sense.
(b) It is the influence of the solidity of the concrete near the protective layer of the steel. Because in the process of cutting, it is bound to vibrate the concrete near the protective layer, forming micro-cracks on the surface of the coarse aggregate of the protective layer, and the role of protecting the building formwork and its quality control layer is reduced. The thickness is often designed in the range of 15-30mm, which is relatively sturdy: When the chisel is cut, the joint between the concrete and the stressed rib can be peeled off to different extents, the bonding property between the steel and the concrete is affected, and the durability is reduced.
We are accustomed to the quality problems such as cracks in concrete members, and we are accustomed to finding reasons for the production, pouring, and maintenance of concrete, but we have neglected the influence of the above formwork on the quality of concrete.
To be continue…
BOFU plastic formwork system4 Construction points for early dismantling of formwork 4.1 Enhance the technical application ability of construction personnel On the…
3 The specific application of early dismantling formwork in construction 3.1 Construction design of early dismantling formwork Before applying the…
2 The application value of early-demolition formwork technology in construction 2.1 Reduce costs and expenses Construction costs affect the economic…
Abstract: early-demolition formwork is an important part of building construction technology. By applying early dismantling formwork in construction activities, construction…
5 Development Prospects of Plastic Formwork First of all, we should deepen the design, adopt standardized design methods, optimize the…
4 Plastic formwork construction technology 4.1 Analysis of operation steps of plastic template A plastic formwork support system was used…