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季节冻土区修建的衬砌渠道,冬季常发生冻胀破坏。为了解决这一问题,新疆、青海、甘肃、陕西、辽宁等省区,近年来对梯形衬砌结构型式的渠道进行了多种改进,经使用和抗冻测定,明确了几种抗冻性能良好的渠道型式,兹简介于下。 一、预制混凝土块与塑膜结合的渠道 兵团农六师猛进干渠和农八师一四八团总干渠,用塑料薄膜与混凝土块结合的型式改建,经多年使用,抗冻效果良好。此种型式有一层薄膜一层预制块、一层薄膜双层预制块和双层薄膜一层预制块三种,一四八团总干渠采用的是一层薄膜双层预制块。其具
Lining channels built in the seasonally frozen terrain often experience frost heaving damage in winter. In order to solve this problem, Xinjiang, Qinghai, Gansu, Shaanxi, Liaoning and other provinces and autonomous regions in recent years, a variety of channels for trapezoidal lining structure of a variety of improvements, the use and antifreeze determination, clear several antifreeze good performance Channel type, it is brief below. First, the combination of precast concrete blocks and plastic film Corps farming Sixth Division Mengchuankuand eight hundred forty-eight Nongadu trunk canal, with plastic film and concrete blocks combined with the type of conversion, after years of use, antifreeze good effect. This type of film has a layer of prefabricated film, a film double prefabricated double layer and double prefabricated film three, one 148 bay trunk canal is a double layer prefabricated film. It has