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http://dx.doi.org/10.9711/KTAJ.2019.21.6.811

A study on the slip-up speed of a shaft using heating slip form  

Ko, Eomsik (Neocity Co., Ltd.)
Lee, Sanghun (General Engineer, Neocity Co., Ltd.)
Park, Jongpil (General Engineer, Neocity Co., Ltd.)
Zi, Goangseup (School of Civil, Environmental and Architectural Engineering, College of Engineering, Korea University)
Kim, Changyong (Korea Institute of Construction and Building Technology)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.21, no.6, 2019 , pp. 811-823 More about this Journal
Abstract
Slip form method is applied to many cases of a shaft these days because it is safer, more economical and faster than cast-in-place method. Slip-up height of the method is approximately 2.5 to 4.0 m/day. If the temperature of concrete is outside the range of 10 to 30℃, the effects of changes in strength or elastic characteristics are significant. Therefore, it is difficult for slip-up speed to be higher than 3 m/day during winter construction. In addition, concrete has heat caused by hydration, which causes temperature cracking of hardened concrete. Therefore, temperature control of concrete curing is necessary for the continuous slip-up of slip form. In this study, the rebound hardness, time of ultrasonic waves propagation, heat of hydration, and external temperature are measured by developing heating panels and test devices for the continuous slip-up. Based on this, heating slip form is manufactured; this was applied to "Kimpo sites" and "Sinwol sites". The compared slip-up speed samples were 1.9 m/day or 0.200 m/hr on average at Gimpo sites (08:00~17:30) and 2.0 m/day or 0.210 m/hr at Sinwol sites.
Keywords
Shaft; Slip form method; Temperature crack; Heating slip form; Slip-up speed;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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