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Influence of Temperature on the Gap between Concrete and Steel Liner in Spiral Casing Structure

Author: WangJinHui
Tutor: KangJingFu
School: Tianjin University
Course: Structural Engineering
Keywords: Keeping Internal Pressure Volute structure Temperature Gap Steel liner Peripheral concrete
CLC: TV315
Type: Master's thesis
Year: 2007
Downloads: 111
Quote: 1
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Abstract

The charge the spiral case structure hydropower structures are widely used in the volute structure, the gap between the spiral case and surrounding concrete of this structure is closely related with the internal water pressure, structural construction of concrete hydration heat temperature rise and The running of the water temperature, the temperature change will affect the size and distribution of the gap between the volute and the concrete surrounding, thereby affecting the safety and durability of the structure. However, due to the complex shape of the volute structure, thermal and mechanical properties of various materials are affected by temperature changes, coupled with the structural construction period and operation period temperature, climate, it is difficult to accurately grasp, to carry out a comprehensive study is quite complex, has yet to be seen the specialized research reported in the literature. In this paper, Shanxi Xilongchi Pumped Storage Power Station, the basic theory of finite element and heat conduction theory based, using ANSYS finite element analysis software as the main computing tool, the construction and operation of two conditions were calculated, the temperature The change in the gap between the concrete volute and peripheral charge the spiral case structure affect. By analog the volute peripherals concrete construction process, the calculation of the structure of the distribution of temperature field and the course of development, and analysis of the development and changes in the gap between the volute and peripheral concrete. The calculations show that: affected by the setting and hardening time of different layered pouring concrete and concrete hydration heat temperature rise, the gap between the volute and the concrete was uneven distribution volute cross-sectional diameter of the larger affected by temperature, the greater the corresponding parts of the The gap value is greater; maximum gap value of the overall model cross section occurs in approximately into a the volute center horizontal axis the obliquely upward within an angle of 30 ° ~ 60 °, the clearance value of the maximum calculated 3.10mm, maximum wheel segment model sectional gap appears in the volute upper, the maximum calculated gap value of 2.80mm. Computing runtime winter and summer temperature load distribution of the temperature field and the structural deformation based on the the runtime temperature of the volute peripheral concrete gap. The results show that: the winter temperatures reduce the cause the volute occur within the shrinkage deformation, the gap larger expansion deformation the summer temperature under volute gap value is smaller, and the gap changes in value are unevenly distributed in the volute circumferential direction. The purposes of this project, the gap is the biggest change in winter 0.39mm summer the biggest change 0.27mm. Load cases for different temperatures are used to do the calculation for overall finite element model and the finite element model of the wheel segment, and compare the results of the two models on the analysis of the the reasonable modeling method volute structure temperature impact proposed Reference observations.

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