I. Purpose of protection
The purpose of culvert wall maintenance is to provide suitable temperature and humidity for hardened concrete, improve the strength of concrete and prevent concrete from cracking.
Second, the maintenance materials
1. Clean water can be used for wall maintenance, but sewage or water containing harmful substances cannot be used.
2. The wall protection cover mainly adopts geotextile with water-retaining function.
Third, the maintenance method
1. After the concrete strength of culvert wall reaches 2.5mpa, the dismantled formwork shall be evenly sprayed with maintenance marks at a distance of 1.5m from the top surface of culvert foundation, and the maintenance marks shall indicate the construction site, number, pouring date and maintenance date. The size of the sign is 100cm×20cm, and the material is thin iron sheet.
2. Before the formwork is removed from the wall, the geotextile shall be covered with water for curing immediately after the concrete is poured and hardened. After the formwork is removed, cover the whole wall with geotextile and spray water for maintenance. The geotextile is tightly wrapped to avoid falling off. The top is provided with a water storage cylinder, and the water storage cylinder is provided with a dripping hole.
3, concrete sprinkler maintenance time is generally not less than 7 days.
Four. safeguard measure
1. Observe the weather changes at any time, determine the times of sprinkling water on cloudy days, rainy days and in the morning, middle and evening every day, and ensure that the surface of culvert wall is always wet. Now spray water 2-3 times a day, the temperature rises, and spray water irregularly for health after the weather gets hot.
2. Sprinkle water evenly to ensure that all parts of the culvert wall are fully maintained, and the concrete strength is guaranteed in strict accordance with the previous maintenance methods.
3. Ensure the curing age. The concrete will get normal strength, and there will be no shrinkage cracks after stopping curing.
Verb (abbreviation of verb) maintenance management system
1, each ZuoYeDui designated persons responsible for concrete curing. During the maintenance period, both day shift and night shift are maintained.
2. The person in charge of on-site construction of the project department must take concrete curing as an important work to grasp and implement. Regularly check and urge the ZuoYeDui to carry out concrete maintenance, so as to standardize the culvert maintenance.
3. Some project leaders supervise and check whether the culvert wall maintenance is in place.
4. The ZuoYeDui that causes concrete cracks due to untimely, careless or improper concrete maintenance will be given economic punishment and fined 5000 yuan.
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