Winter construction

When the daily average temperature is below 5 ° C, winter construction should be carried out and meet the following requirements:
1. Before grouting, measures should be taken to preheat the foundation surface, keep its temperature above 100 ° C, and remove accumulated water.
Before being frozen, the compressive strength of cement-based grouting materials shall not be less than 5MPa.

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In areas where groundwater has varying degrees of corrosiveness to concrete, steel bars, and steel structures, corresponding waterproof and anti-corrosion measures should be taken to ensure the durability of concrete, steel bars, and steel structures. In the construction of subways and underground projects in cities, according to the requirements of environmental protection and water resource protection, permanent waterproofing should be achieved through prevention rather than drainage. It is strictly prohibited to introduce groundwater from the ground into the underground engineering of Tianjin Station transportation hub. During the construction period, water free operations should be carried out, and a combination of prevention, drainage, interception, and blocking can be used. Strictly control the deformation of the enclosure structure during construction, ensure the flatness and non cracking of the enclosure structure base, and ensure that there is no visible water in the enclosure structure during construction.
Construction in high temperature climate environment
If the temperature of the grouting site is greater than 35 ° C, construction should be postponed according to the high temperature climate and meet the following requirements:
Measures should be taken 24 hours before grouting to prevent direct or other thermal radiation from the grouting area.
2. Take appropriate cooling measures, and the temperature of the concrete foundation and equipment base plate in contact with the cement-based grouting material should not exceed 35 ° C.
3. The injection temperature of the slurry should not exceed 30 ° C.
4. Moisturizing and curing measures should be taken promptly after grouting.

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Part of the evaluation of social and economic benefits. It is necessary to evaluate the financial and economic benefits of different schemes, determine whether the project is economically feasible, as one of the main criteria for selection, and select the scheme. Simultaneously conduct a comprehensive evaluation of the social and environmental benefits generated by pre mixed (dry mixed) mortar. Due to the lower investment amount of pre mixed mortar production projects compared to general industrial projects, in the process of national, provincial, or simplified investment approval procedures, if the construction progress is pursued unilaterally and the feasibility study of pre mixed (dry mixed) mortar is omitted, once the project is completed, its production process or overall irrationality will lead to irreparable economic losses. It is necessary to conduct a feasibility study on the production project of ready mixed (dry mixed) mortar.

The maintenance free construction conditions are as follows

When the construction temperature is above 5 ℃ and below 35 ℃, there is no need for maintenance after foundation grouting. If the temperature exceeds the range, the grouting material construction and maintenance methods should be followed for maintenance.

It looks like clouds rising straight up, or dark clouds rolling, or floating clouds filling the sky. Some patterns resemble ripples of water, or rippling waves, or stormy waves, or vast misty waves. This type of stone is commonly used as building decorative panels. White marble: crystal clear and pure, as white as jade, shining with smoke and smoke. It is a good board for carving and painting, and can also be made into high-quality building boards. Colorful marble: It is a masterpiece of marble that, after grinding and polishing, presents a natural painting of various colors and shapes, which is rare in the world. According to their different patterns and colors, colored marble can be divided into "green flowers" (green, dark green patterns, lush green patterns, like the scenery of spring), "autumn flowers" (yellow, brown, red patterns, patterns like the scenery of autumn), and "ink wash flowers" (black, light black patterns, patterns resembling excellent ink paintings, graceful and graceful - from the exquisite brush of Danqing).