1. Set small steel molds, not set according to regulations, resulting in poor overall performance of the building
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the reason:
2. The foundation of the template is not firm, no flat plate is placed, and the waterproof measures cause the foundation to sink.
3. The construction of wooden building formwork or plywood is used. After the experience is accepted, the concrete is not poured in time, and the long-term sun and rain are deformed.
4. The support spacing is too large, and the rigidity of the steel plate is poor.
5. The speed of pouring concrete and column concrete is too fast, the height of one watering is too high, and the vibration is excessive.
Solution:
1. When assembling small steel molds, the joints shall be placed according to the regulations. The spacing and specifications of the cofferdams and pull bolts shall be set according to the design requirements.
2. The supporting distance of the bottom of the beam should be able to ensure that no deformation occurs under the weight of the concrete and the construction load. If the bottom of the support is mud foundation, it should be carefully compacted, set up a drainage ditch, and lay a long pad or section steel to ensure support. Not sinking.
3. When using wooden building formwork and plywood building formwork construction, concrete should be poured in time after passing the experience to prevent deformation of wood building formwork during long-term exposure to rain and rain.
4. When designing the building formwork and supporting system, it should fully consider its own weight, construction load and the self-sufficiency of concrete and the lateral pressure generated during pouring to ensure sufficient load-bearing capacity, rigidity and stability of the building formwork and support.
5. For cast-in-situ reinforced concrete beams and slabs with a span of not less than 4 m, the building formwork shall be arched according to the design requirements; when there is no specific requirement for the design, the arching height shall be 1/1000-3/1000 of the span. 