CAJ | 학술논문

枕头坝一级水电站导流明渠纵向碾压混凝土围堰采用的施工工艺特点为，在不分纵缝的大仓面通仓或斜层薄层连续铺筑数层后，以短间歇的均匀上升。该施工方法由于仓面大、基础约束大，易使表面产生裂缝。为此，通过优选原材料及配合比，并对浇筑全过程，如出机口温度、运输和浇筑过程加强控制，有效降低了碾压混凝土水化热温升，提高了混凝土的抗裂能力。取芯检查表明，电站纵向子围堰碾压混凝土浇筑质量优良，达到行业领先水平。
침두패일급수전참도류명거종향년압혼응토위언채용적시공공예특점위，재불분종봉적대창면통창혹사층박층련속포축수층후，이단간헐적균균상승。해시공방법유우창면대、기출약속대，역사표면산생렬봉。위차，통과우선원재료급배합비，병대요축전과정，여출궤구온도、운수화요축과정가강공제，유효강저료년압혼응토수화열온승，제고료혼응토적항렬능력。취심검사표명，전참종향자위언년압혼응토요축질량우량，체도행업령선수평。
The placement technical characteristics for longitudinal cofferdam of Zhentouba I Hydropower Station are as follow:monolithically placement without longitudinal joints or using inclined-lift and thin-lift placement, which is followed by even-lift with short intermittent. The presented method is likely to produce concrete crack due to large monolith and strong restraint. Therefore, several measures were adopted, including optimizing raw material and mixing proportion, and strengthening control on concrete temperature at outlet of machine as well as whole process of transportation and placement, so as to reduce hydration heat of concrete and improve the crack prevention ability of the concrete. The core test showed that the placement quality of the RCC is high and reaches advanced level.