The angled gold steel is set to withstand the lateral force transmitted from the top of the tank. For the low pressure large storage tank, the joint between the tank top and the tank wall is mainly subjected to the circumferential force caused by the internal pressure, so the structure of the pressure receiving area The requirements are more stringent, and the area of ​​the pressure-bearing area is mainly calculated from the internal pressure. When the tank is subjected to positive pressure, the pressure-receiving area required for the upper pressure-receiving area is basically proportional to the internal pressure. For the atmospheric pressure tank, the tank top is connected to the tank wall due to the small internal pressure. determine.
The lifting force generated by the internal pressure and the wind load is the determining condition for whether the tank is to be provided with an anchor bolt. For the atmospheric pressure storage tanks we often contact, because the internal pressure is equal to or close to the normal pressure (the lifting force caused by external factors such as wind load is much smaller than the storage tank), it is generally unnecessary to add anchor bolts. For low-pressure large-scale storage tanks, the lifting force caused by the combined action of internal pressure and wind load is relatively large. When it is larger than the tank's own weight (excluding the bottom of the tank), anchor bolts must be set (or increase Heavy method) Reinforcement to prevent the edge portion of the tank from leaving the base surface, causing the bottom of the tank to rupture. The lifting force generated by the vertical component of the hydraulic pressure should also be considered.
For low-pressure large-scale storage tanks with low internal pressure, the maximum design external pressure is determined by the thickness of the tank top wall. Since the force of the internal pressure on the top of the tank is opposite to the direction of the force of other loads, there is a certain offsetting effect. Therefore, we only need to calculate the maximum internal pressure of the tank top and the maximum external pressure of the tank top (operation negative pressure and dynamic and static). The sum of the loads acts to determine the thickness of the can top based on the stresses of the two most adverse conditions.
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