Pingdingshan Observation Point Observation Pile Wholesale

Description :

　　Pingdingshan Observation Point Observation Pile Wholesale

　　The content of settlement observation records includes: the project name, different observation dates, and records of the elevation and gradual settlement of each observation point measured based on benchmark points under different project states. The instruments and methods for settlement observation should use precision leveling instruments and copper water level rulers. In the absence of these instruments, precision engineering leveling instruments (with matching levels) and calibrated leveling instruments can also be used for settlement observation. Fixed measuring tools should be used for observation, and personnel should also be fixed. Each observation must be checked on site using a circular closure method or a reciprocating closure method. The difference between two observations at the same observation point shall not exceed 1mm, and the leveling measurement shall be carried out using the closed method. The use of second-order leveling measurement should comply with

　　Requirement for (mm); The use of third-order leveling measurement should comply with

　　Requirement for (mm). The number and time of settlement observations (n is the number of times the level is installed during the leveling measurement process) should be in accordance with the design requirements. Generally, the number and time of settlement observations should be carried out in a timely manner after the observation points are securely installed. Civil buildings should be observed once every additional floor, while industrial buildings should be observed separately at different load stages; The settlement observation conducted by the construction unit during the construction period shall not be less than 4 times. The observation frequency after the completion of all buildings and structures is 4 times per year, 2 times per year in the second year, and 1 time per year after the third year, until the settlement stabilizes (determined by the relationship curve between settlement and time). The observation period is generally 2 years for sandy soil foundation, 5 years for cohesive soil foundation, and 10 years for soft soil foundation. When buildings and structures suddenly experience significant settlement, uneven settlement, or severe cracks, continuous observations should be conducted daily or every few days, and cracks should also be observed. For the observation of cracks in buildings, reliable observation markers (such as gypsum strips, etc.) should be set up on the cracks. After observation, detailed drawings should be drawn to indicate the location, shape, and size of the cracks, and the date and number should be indicated. If necessary, take photos of cracks. The crack width can be observed with a magnifying glass. The engineering status is marked by a certain floor (or elevation) for general civil buildings; Industrial buildings are marked with different load stages as status indicators. For each settlement observation, the settlement amount and cumulative settlement amount between adjacent observation points should be checked. If the settlement is too large or uneven, measures should be taken in a timely manner. The numbering of each observation point in the column for other observation points should be consistent with the numbering in the settlement observation diagram.

　　In the past 20 years, China's iron production has experienced explosive growth. The annual production has risen from 131 million tons in 2000 to 869 million tons in 2021, with a cumulative increase of nearly 7 times. Since entering this century, except for 2015 and 2021, the annual production of molten iron has consistently increased year-on-year. Especially since 2018, the annual increase in iron ore production has significantly increased compared to before. In 2020, the annual increase in iron ore production has reached around 80 million tons, corresponding to an annual increase in iron ore demand of over 100 million tons. This is an important reason for the continuous upward shift of the iron ore price center in recent years. However, in the medium to long term, China's future economic development model will gradually transform, with a decreasing dependence on traditional real estate and infrastructure investment, and a gradual decline in demand for building materials. With the proposal of the "dual carbon" target, there has been a clear turning point in domestic iron production since the second half of 2021, and the annual iron production has achieved a year-on-year decline for the second time since the beginning of this century. It can be basically confirmed that 2020 will be the historical high point of China's iron ore production, and the total demand for iron ore in China will enter a downward trend in the future.

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