Basic requirements of construction scheme of culvert splayed wall
1, the quality and specifications of cement, sand, gravel, water, admixture and mixture used in concrete must meet the requirements of relevant technical specifications, and the mixture ratio should be constructed in accordance with regulations.
2. Before pouring, the inspection of culvert, pier and supporting surface must be qualified, and the cover plate and supporting surface must be tight.
3, block construction joints should be consistent with the settlement joint.
4, plate body can not appear leakage reinforcement and empty phenomenon.
5. The specifications and strength of joint filling materials between plates shall meet the design requirements and be consistent with settlement joints.
Construction method of culvert splayed wall construction scheme
1. Considering the irregularity of the splayed wall, it is suggested that the formwork should be designed and manufactured with plywood whose rigidity and strength meet the requirements. If steel formwork is used, PVC board shall be attached to the exposed surface inside. If ordinary bamboo veneer is used, the exposed surface inside should be pasted with PVC veneer.
2, in order to put an end to the phenomenon of rotten roots and slurry leakage, the bottom of the template is slit with a cutting machine, and the PVC board is inserted into the seam when it is pasted, and mortar is applied.
3, plug template with bamboo veneer processing, nail the square wood, fixed, verticality and straightness to meet the requirements.
4, PVC board besmear brushs paraffin, easy to dismantle and ensure that the concrete surface color is consistent.
5, in order to avoid the template floating, the bottom of the template is fixed with construction control nails or expansion screws.
6. During the construction of the top slope of the splayed wall, a horizontal steel pipe with a width of about 40cm will be propped up every 1m square to facilitate surface vibration. At the same time, draw the slope line on the template, and seal the surface by special personnel to make the slope line smooth and the slope is consistent with the subgrade slope. Due to the large slope of concrete on the slope, it is necessary to seal the surface of newly poured concrete for many times to ensure the appearance quality of concrete.
7. The feeding current of each layer shall not exceed 30mm, and secondary vibration shall be adopted as far as possible to prevent bubbles.
8, concrete curing
A, concrete immediately after ripping cover for maintenance. It is suggested that a new type of concrete water-saving and moisture-retaining curing film should be used for full coverage, and the curing time should be no less than 7 days.
B, stick it to the inside of the cured film with double-sided tape to fix the cured film. Double-sided tape should be attached to the outer edge of health care to ensure that the health care film covers tightly.
C, if the concrete surface is dry before covering, the curing film can be covered after watering.
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