A Study on the Quality Control of Concrete during the Slip Form Erection of Pylon

Hyejin Yoon, Won Jong Chin, Hee Seok Kim, Young Jin Kim

Global Technology Cooperation Center, Korea Institute of Construction Technology, Goyang, South Korea.
Structural Engineering Research Division, Korea Institute of Construction Technology, Goyang, South Korea.

DOI: 10.4236/eng.2013.58078                

Abstract

The construction market of super-high-rise buildings and long-span bridges has recognized unprecedented expansion owing to the development of high performance and high strength materials and the advances achieved in the design and construction technologies. In parallel to the lengthening and enlargement in scale of the structures, securing quality control technology of concrete while reducing the construction duration using improved construction methods emerges as a critical problem for concrete structures. In the erection of concrete pylons, slip forming represents the latest method offering the advantage of reducing drastically the construction duration compared to other methods by adopting automated slip-up of the forms and enabling 24-hour continuous placing. This study determines the slip-up time of the slip form by evaluating the early strength through the surface wave velocity and develops lightweight GFRP form in order to secure the quality of concrete during the slip form erection of pylons. A slip form system is fabricated and mockup test is conducted to verify the performances of the developed techniques through the construction of 10 m-high pylon with a hollow section.

Keywords

Slip Form System; Construction of Concrete Pylons; GFRP Form

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	Ministry of Construction and Transportation, “Standard Specification for Temporary Works,” Ministry of Construction and Transportation, 2006.
[2]	Ministry of Land, Transport & Maritime Affairs, “Concrete Standard Specification,” Ministry of Land, Transport & Maritime Affairs, 2009.
[3]	Ministry of Land, “Transport & Maritime Affairs,” Tunnel Standard Specification, Ministry of Land, Transport & Maritime Affairs, 2009.
[4]	Korea Expressway Corporation, “Expressway Construction Guide Specification,” Korea Expressway Corporation, 2009.
[5]	Korea Concrete Institute, “Manual of Concrete Practice,” Korea Concrete Institute, 2002.
[6]	ACI 318-05, “Building Code Requirement for Structural Concrete and Commentary,” ACI 318, 2004
[7]	ACI 347-04, “Guide to Formwork for Concrete,” ACI 347, 2005
[8]	EM 1110-1-2009, “Engineering and Design Architectural Concrete,” EM, 1997.
[9]	Korean Standards Association, “KS F 2436 Testing Method for Time of Setting of Concrete Mixture by Penetration Resistance,” 2007
[10]	Z. Reichverger and C. Jaegermann, “Optimal Regime in Slip form Concreting,” Matériaux et Constructions, Vol. 18, No. 74, 1980, pp. 109-113. doi:10.1007/BF02473807
[11]	H. Kim, Y. J. Kim, W. J. Chin and H. Yoon, “A Study on the Determination of Slip-Up Time for Slip-Form System using Surface Wave Velocity,” Journal of the Korean Society of Civil Engineers, Vol. 32, No. 5D, 2012, pp. 483492.
[12]	H. Kim, “Mechanical Characteristics of GFRP Slip Form for in-Situ Application,” Ph.D. Thesis, Hanyang University, Seoul, 2012.