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.
How many tons of grouting material per cubic meter for the specialized bearings of Huaibei Lieshan Bridge during secondary reinforcement and renovation
Light coffee net: The base color is light coffee, with a small amount of white flowers, good brightness, and easy to glue and repair; Indian Red: The base is a deep red color, which is divided into large, medium, and small flowers due to different structures. The color and pattern are relatively stable, and the texture is hard; British brown: with a dark brown background and orange red granules distributed on top; California Golden Hemp: Overall red and black, with alternating light red and black stripes; Red amethyst: base color light purple, red and white crystal spots; Golden hemp: overall light yellow, with red purple dots distributed on top; Dark green hemp: base color is green, with a hint of sunshine; Jinsha Black: with a black base and golden yellow dots distributed on top, divided into large, medium, and small dots, with clear directionality when cutting.
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.
How many tons of grouting material per cubic meter for the specialized bearings of Huaibei Lieshan Bridge during secondary reinforcement and renovation
China ranks first in the world in terms of production and consumption of stone materials. Many outward oriented stone companies have also bought out the mining rights of stone mines abroad, thus forming a development pattern of "buying the world and selling the world" for stone. Stone is an excellent decorative material that is healthy, safe, and environmentally friendly. A large amount of data from the National Stone Product Quality Testing Center proves that the radioactive index of common marble is only about 1/5 of the limit index, which is basically the same as the radioactive index of soil and fully meets the green product standard. The radioactive index of domestically produced granite is far below the limit value of the standard index, and it belongs to Class A products with a sufficiently large safety factor.
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.
On March 18, 2024, the Ministry of Construction officially issued a notice titled "Promotion and Restriction of Prohibited Technologies by the Ministry of Construction" (referred to as the "Technical Notice"), requiring all departments to actively promote the promotion and application of new technologies and products listed in the "Technical Notice" in the local area, and to quickly familiarize themselves with and accurately grasp the content and technical requirements of the notice. Therefore, one of the categories of building waterproofing engineering systems in the announcement, the promotion and application technology of polyvinyl chloride waterproofing membrane (II) material, is now introduced to relevant departments such as construction, development, design, construction, supervision, and quality inspection as a reference to ensure the effective implementation of the Technical Announcement. Polychlorinated (PVC) waterproofing membrane (II) type and its application technology definition Material composition Polychlorinated (PVC) waterproofing membrane is a waterproofing membrane made mainly of polymer and is one of the main products of synthetic polymer membranes.
