Supervision engineer's safety control over formwork works
Content Introduction In recent years, quality and safety accidents caused by insufficient strength, rigidity and stability of formwork support system, no special scheme for formwork engineering, and erection not in accordance with the scheme have occurred from time to time. It may seriously affect the quality of concrete structure, and have to rework or take other remedial measures, which not only increases the investment but also delays the construction period, making it difficult to achieve our control objectives; If it is serious, it will collapse, causing casualties and great losses to people's lives and property. Therefore, the supervision engineers should attach great importance to the safety of the formwork engineering, and should not take the fluke mentality of "formwork engineering is not an engineering entity, and the construction unit knows how to do it", otherwise, major quality, safety problems or accidents will easily occur. 1. Carefully review the special construction scheme 1? 1. Understanding of special construction scheme review 1? 2. Before the scheme review, the mandatory standards of "formwork engineering" 1? 3. The scheme shall be analyzed and compared with the "mandatory standard"? 3? 1 In the "Overview" of the scheme, there should be engineering structure form, geometric dimensions and elevation of main beam, slab and column sections, construction equipment and concrete construction technology (such as concrete pumping equipment, tower crane, trolley transportation, etc.), foundation soil category (mainly referring to the soil at the bottom of the support pole), types, specifications, dimensions and layout of formwork and support system. Because they are an important basis for load and structure calculation, and also an important basis for our inspection and acceptance of the erected formwork and its support system. At the same time, by reviewing whether the scheme has these contents and whether it is correct, we can also judge whether the scheme is consistent with the actual project. For example, a complex building project is designed as a five story 7.20 m span concrete frame structure, with the floor height of 4.20 m for the first floor and 3.90 m for other floors, and the cross section size of the frame beam is 250 × 650 mm; A 12.5m cross vehicle passage is set in the middle of the building. The beam surface elevation of this part is 8.10m (a transverse coupling beam is set at the elevation of 4.20), and the section size of the longitudinal main beam is 300 × 1000mm. However, in the formwork scheme reported by the construction unit, only "... the section size of the main beam is 250 × 600mm" was found. The content of the reported scheme is not only inconsistent with the design size of 250 × 650mm of the frame beam, but also does not make any description on the frame beam of the vehicle passage with large span, heavy self weight and high height, which is the most unfavorable structure and dangerous part. What is the basis for calculating the structural internal force of the formwork and its supporting system?
