L48A1 Mast Section Key Points of Construction and Treatment of Tower Suspension Foundation
1. Cases where the basis does not need to be addressed
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When the base position of the tower is wide and the foundation layer is shallow, it can be directly constructed according to the base map of the tower. The base should meet the design requirements, generally 0.2-0 .3 MPa, which is easily satisfied or handled. In order to prevent groundwater flooding or safety, it is usually safer to place the base on a hard bottom.
The part that exceeds the depth of the foundation can be poured with C15 stone gongs. It should be noted that the tower hanging foundation is often used as a piece of stone grit because the owner saves investment requirements. There have been construction units that have used mudstone as a piece of stone to cause the tower to collapse. accident.
2. Deep soil layer.
(1) The thickness of the soil layer is more than 8M. That is, the rectangular tomb foundation is used as a support platform, and 800 suitable rocks are dug in each corner, and the requirements can be met by structural reinforcement. The cross-shaped foundation is to dig 5 piles and review the internal reinforcement of the foundation.
(2) If the thickness of the soil layer exceeds 8M and the excavation pile is more and safer, a smaller diameter drilling pile may be considered for solution. At this point, the construction unit is required to provide a balance moment calculation book for the tower crane for inspection.
The earlier manual did not provide data, and can only refer directly to the original foundation bearing capacity conversion of the anti-overturning moment as a basis, the calculation results are relatively conservative, and the requirements for the bearing capacity of the foundation are also high.
(3) The method of review calculates the anti-overturning moment according to the bearing capacity of the pile foundation and the distance between piles. This method has a clear form of force and is relatively simple to calculate.
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