Corrugated Steel Structure (CSS), which was applied in North America in the early 1900s and has been installed in more than 1,000,000 places worldwide, has been in service since 1996, 100 years later, in Korea with POSCO, Korea Expressway Corporation, Seoul National University, Hanyang University, etc. It has been applied to the domestic market through commercialization research by specialized companies. Based on this, since the 2000s, it has been widely applied to road crossing passages, waterways and local small rivers, animal movement ecological passages, and Piam tunnels. Based on the advantages and economic feasibility of minimizing the existing vehicle traffic control during construction, it is a universal new construction method along with the existing reinforced concrete construction method. About 5000 corrugated steel plate structures have been installed and operated in Korea for 20 years.
However, regarding the various advantages of the construction method and the rapidly occurring demand, in the beginning, detailed explanations of the national design standards and specifications were insufficient. Problems such as deformation of the corrugated steel sheet occurred intermittently due to the lack of understanding of the backfill material and backfill compaction, which are the most important factors in
To improve this, ChungAmEnC has continuously improved and supplemented related standards through R&D with various related organizations, and based on domestic and foreign failure cases, provides optimized design solutions in advance for possible problems during actual construction. Optimized solutions include Virtual Construction: a three-dimensional system for step-by-step forecasting processes. (BIM LoD: 350 / Tekla, Trimble) and 3D Scanning (Leica P30 System, Cyclone ) Minimize errors that may occur at each construction stage I did. In addition, by providing 3D FEM, 3D printing and landscape design solutions, we will do our best to become a company that continuously develops and provides the world's best solutions that overcome the uncertainty of design and construction anxiety that customers have felt.
History of CSS
In 1896, an American civil engineer James. H. Watson and Starting with Stanley Simpson's patent, it was applied to small drainage channels in North America until the 1930s, and by the late 1900s, the maximum span was applied up to 11m and expanded to small bridges, passageways, and military facilities (ammunition depots). Since the 2000s, the span has been extended to 23m and applied to ecological tunnels, mine stockpiles, reclaim tunnels, and military facilities (hangars). 2014-2016 R&D and commercialization of extra-corrugated corrugated steel sheet (EXSCor) of Cheongam EnC With success, the maximum span was extended to 40m. It satisfies the maximum loads of CAT 797F (about 620 tons), EURO LM71, mine trucks, which could not be applied in the past with respect to live loading along with the expansion of span, so that it is economical, stable, and workable than concrete structures in multi-step processes. has enough competitiveness. In addition, extra corrugated steel sheet (EXSCor) is listed as a construction method and product according to design standards in Korea (KDS, KCS) as well as AASHTO LRFD and ASTM A796M in the United States.
Solution Rehabilitation
Rehabilitation
If the existing canals, waterways, and bridge structures are aged and unable to perform their functions, or if safety cannot be secured with the cross-section of the existing structures due to changes in surrounding conditions, the existing structures will be demolished and then reinstalled or repaired and reinforced. Existing repair and reinforcement methods included a method of assembling reinforcing bars inside, installing a formwork and a bar, then pouring concrete, and a method of installing precast concrete inside. However, the working space is narrow during internal construction, which raises the risk of safety accidents. In terms of quality control and construction supervision, actual quality and process management are not easy. In addition, in the case of on-site casting, as it is accompanied by the installation of dongbari, internal passage of existing passers is not possible, which causes civil complaints. do.
Remuneration enhancement proposal_Rev.01_2018
3D Scan Report_Mokpo-Gwangyang Section 6 (sta.4+982)
* Korea Expressway Corporation repair and reinforcement video
Solution
The method of repairing and reinforcing structures using corrugated steel plates is: ① After securing a space to mount the steel plate inside the existing structure ➞ ② After assembling each sheet of steel plate from the inside or assembling the corrugated steel plate from the outside ➞ ③ with hydraulic equipment Push in using a mechanical device ➞ ④ Fill the space between the corrugated steel plate and the existing structure ➞ ⑤ Use the grouting socket attached to the corrugated steel plate at the factory to fill the space behind the corrugated steel plate ➞⑥ with concrete . . By using corrugated steel plate inside to reinforce the existing structure, it is possible to prevent the interruption of traffic that may occur when the existing structure is demolished, and to reduce the incidental cost due to securing safety and shortening the construction period.
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In addition, for accurate construction quality and shortening of construction period, the target structure may be interfered with based on ① 3D measurement (Leica P30®, Cyclone®, ±3mm) ➞ ② based on accurate 3D CAD drawings of the repair and reinforcement structures prior to start of construction. Through pre-removal and adjustment of existing parts ➞ ③ After drawing up the production drawings, we overcame the problems of other construction methods by precisely manufacturing and installing bolts on site.
In accordance with the site conditions requiring urgent construction, design, manufacturing and installation can be completed in a shorter time than that of concrete structures. Design: 2 days, Production: 1 day, On-site installation of corrugated steel sheet: 1 day (Railbike site in Cheongdo-gun, 2018. 8)
