Cracks in large equipment foundations are very common in the industry,and they are prone to serious problems such as increasing corrosion of embedded parts and leakage of oil or water. Therefore, it is very important to reduce and prevent these cracks.
1. Use high-quality materials and strictly control the process
The quality of the materials and the construction process are not only related to the strength of the foundation, but also related to the risk of cracks. When selecting materials, all standards should be strictly followed. In particular, attention should be paid to the selection of high-strength and high-quality lean concrete and self-compacting concrete with good workability. At the same time, the construction process should be strictly controlled and the construction quality should be observed. In particular, measures to prevent and control cracking should be taken prior to casting.
2. Design and construction of controlled-joints
It is often difficult to avoid the use of large paving equipment foundations and the formation of joints due to different reasons. Therefore, the design and construction of controlled joints is important to reduce and prevent cracks. Construction joints should be as close to 45 degrees as possible and should be installed when the concrete strength is higher than 3/4 of the design strength. Also, the construction joint should be slightly inclined. To ensure the effective transfer of loads and minimize the risk of cracking, construction joints should also be installed when the gap between them is equal to one fourth of the shorter length of the foundation.
3. Optimize the placement and design of reinforcement
Optimize the design and placement of reinforcement and reduce the risk of cracking due to shrinkage and creep. To prevent cracking caused by shrinkage and curing, it is recommended to use low-shrinkage concrete and evenly distribute reinforced steel or other high-strength components in a band-shaped manner. At the same time, the size and spacing of bars should be strictly controlled.
4. Effective temperature control
The temperature of the concrete foundation should be effectively controlled during the entire construction process. Heat insulation, humidification and anti-freeze measures should be taken, and the temperature of the pouring surface should be monitored and controlled throughout the entire construction process, including the surface temperature of the foundation after casting, the curing temperature, the number of times of watering curing, the curing time, and the wetness of the curing site.
5. Control the salinity of the soil
The foundation should be made in soils of relatively low salinity, and measures should be taken to reduce the salt content before the foundation is cast. If the salt content is too large, measures such as leaching, drying and soil replacement should be taken. At the same time, the migration of saltwater should be prevented in the construction process.
By taking the above measures in a comprehensive manner, we can effectively reduce and prevent cracks in large equipment foundations.
