A variable cross-section hybrid vault reticulated shell for storage tanks

Abstract

The invention discloses a variable-cross-section mixing type arch top net case for a storage tank, and relates to the field of oil gas storage and transportation. The invention provides the structural form of the variable-cross-section mixing type arch top net case for the storage tank through the structural optimization and value simulation in consideration of the requirements of light weight of the large-scale arch top net case storage tank. Compared with the existing storage tank arch top net case, the variable-cross-section mixing type arch top net case has the following advantages that (1) the storage tank arch top net case is developed to the trend of light weight, the stress condition of the integral structure is sufficiently considered, the materials can be effectively saved on the premise of ensuring the sufficient intensity, rigidity and stability, and in addition, the safety is ensured; (2) the load transferred to the lower part tank body from the net case top is reduced, so that the deformation and the stress of the tank wall top structure of the arch top net case storage tank are reduced, and further, the design idea of strong tank and weak top of the large-scale arch top storage tank is further embodied; (3) all net case rod elements can be easily distinguished and classified, and the convenience of field construction and installation is improved.

Description

technical field [0001] The invention relates to a variable cross-section hybrid vault reticulated shell for storage tanks, which belongs to the field of petrochemical storage and transportation equipment. Background technique [0002] With the increase of energy demand, refined oil storage depots are becoming larger and larger, and the volume of supporting vault tanks or inner floating roof tanks is getting larger and larger. Drawing lessons from the widely used reticulated shell structure in civil engineering, which has the characteristics of large span and reasonable force, large-scale product oil storage tanks began to use vaulted reticulated shells as tank roof structures. At present, the reticulated shell structure mostly used in China is a single-layer spherical reticulated shell, mainly including two-way meridian reticulated shell, Schweidler reticulated shell, Kewitt reticulated shell, united square reticulated shell and geodesic reticulated shell, etc. , among whic...

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Problems solved by technology

[0003] However, the existing storage tank arch reticulated shell structure generally uses rods with the same cross-sectional size, which has the following problems: (1) In fact, the stress on each rod of the reticulated shell is not uniform. If the cross-sectional dimensions of the rods are all the same, It is necessary to determine the specification of the member according to the stress condition of the most dangerous member. For some members with less stress, the performance of the material cannot be fully utilized, the material utilization rate is low, and the economy is poor. For large-scale dome reticulated shells This is especially prominent for storage tanks; (2) For storage tank vaulted reticulated shells, the fixed load includes the gravity load of reticulated shell members and skin, which will be transmitted to the lower tank body, while the top of the tank wall A few circles of steel plates are only about 10mm. If the load is too large, it will have an adverse effect on the lower tank body, which cannot reflect the design principle of "strong tank and weak roof" for vaulted reticulated shell storage tanks

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