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Mathematical Problems in Engineering
Volume 2014, Article ID 973680, 7 pages
http://dx.doi.org/10.1155/2014/973680
Research Article

Surface Thermal Insulation and Pipe Cooling of Spillways during Concrete Construction Period

1Department of Structures and Materials, China Institute of Water Resources and Hydropower Research, Beijing 100038, China
2Henan Yellow River Reconnaissance, Design and Research Institute, Beijing Branch, Beijing 100073, China

Received 7 March 2014; Revised 7 June 2014; Accepted 7 June 2014; Published 7 July 2014

Academic Editor: Cheng Shao

Copyright © 2014 Wang Zhenhong et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Given that spillways adopt a hydraulic thin concrete plate structure, this structure is difficult to protect from cracks. The mechanism of the cracks in spillways shows that temperature stress is the major reason for cracks. Therefore, an effective way of preventing cracks is a timely and reasonable temperature-control program. Studies show that one effective prevention method is surface thermal insulation combined with internal pipe cooling. The major factors influencing temperature control effects are the time of performing thermal insulation and the ways of internal pipe cooling. To solve this problem, a spillway is taken as an example and a three-dimensional finite element program and pipe cooling calculation method are adopted to conduct simulation calculation and analysis on the temperature fields and stress fields of concretes subject to different temperature-control programs. The temperature-control effects are then compared. Optimization results show that timely and reasonable surface thermal insulation and water-flowing mode can ensure good temperature-control and anticrack effects. The method has reference value for similar projects.