Factors related to the vibration of the tower building

The working condition indicates that when the finite element program is used to calculate the natural vibration characteristics of the structure, in order to consider the effect of the soil on the tower building, a spring unit is used for the simulation. There are four cases to consider: do not consider the role of soil on the pile, only add constraints at the bottom of the model. Considering the effect of the soil on the pile, the spring unit is only added in the X and Y directions of the pile. Consider the effect of soil on the pile, and add a spring unit every 90 weeks. Considering the effect of soil on the pile, a spring unit is added every 45th of the pile. The calculation and analysis can be derived from the first ten-order frequency table calculated in four cases. When the pile-soil effect is not considered, the self-vibration characteristics of the structure have a large difference with the consideration of the pile-soil effect. In the latter three cases considering the effect of pile and soil, from the vibration mode, the first ten modes are consistent in the three cases. From the numerical value, the calculation results of the self-vibration characteristics of the tower structure gradually increase from the first order to the sixth order with the increase of the spring unit, and the maximum difference does not exceed 0.3%. However, the calculation results of the three cases after the seventh order are basically the same. .

Since a large amount of groundwater will affect the buildings and structures near the construction site, causing the foundation and the ground to sink and sink, it is necessary to consider setting a watering point near the hole pile or using a pile that has been excavated but not yet completed. Irrigation is carried out to maintain water pressure balance and soil stability. During the construction of the half-rock, there are more than 10 hole piles in the excavation where half of the rock and half of the soil layer appear. In the case where the soil layer cannot be dug, and the inner diameter of the hole pile cannot be guaranteed, a method of blasting the rock is adopted. Arrange the blasthole according to the size of the rock. When there is no groundwater, try to use the expanded silent explosive. If the explosive cannot be used, it can be blasted with No. 2 ammonium nitrate or TNT explosive. When there is groundwater that cannot be detonated, the No. 1 ammonium oil can be used. Waterproof explosives are blasted. The installation and detonation of explosives must have a clear division of labor, and the explosives should be carefully and compact. The detonator and the fuse should be tight and not loose; the ends of the fuse should be flat. After the explosives are installed, cover the hole of the hole with a certain weight of cover to prevent the flying stone from injuring people.

When the silt encounters the silt soil layer, the depth of the soil layer should be firstly determined. When the soil layer is thinner and the settlement amount is small, the wooden side and the wood board formwork can be used as the support of the retaining wall to shorten the excavation of the section. Depth and timely pouring the concrete retaining wall of the section. When the soil layer is thicker and the settlement amount is relatively large, the cement soil layer can be infused by the cement infusion consolidation method, and the soil layer is reinforced after the section is manually excavated. The sand flow sand is formed by the sand and powder sand layer under the action of groundwater. It has a great influence on the artificial digging pile. When it is serious, it will cause a leak and cause a quality accident. Therefore, effective measures must be taken to continue the construction. When the sand layer is found, the excavation depth of the section can be shortened to a length of 30cm50cm to reduce the exposure time of the soil layer, and the concrete retaining wall can be poured in time. The concrete can be mixed with quick-setting agent to accelerate the concrete. Solidification speed. For the hole piles with a small amount of sand, the nearby hole piles without sand flow can be first dug, so that it can play the role of collecting wells and achieve the purpose of precipitation. When the wall of the hole collapses and there is a flow of muddy sand that cannot be formed into a hole, it can be piled up with a woven bag filled with soil to form the outer wall of the hole pile, and controlled to ensure that the inner wall size meets the design requirements. When encountering fluid flow sand, the wall of the hole shall be constructed with steel casing, which is to be dug, that is, proofread, that is, acceptance, that is, concrete retaining wall.

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