1. Overview

Corrugated steel plate structure can be easily fabricated on the spot by connecting 150mm-by-50mm corrugated sheets with bolts. Due to its ductile nature, orrugated steel structure can deal with the differential settlement problem, thus complementing the shortcomings of traditional concrete structures.Generally, it is used in ground tunnels, water channel boxes, underground utility tunnels, and small-scale bridges.

Usage

Corrugated steel plate structure is mainly used in underground tunnels, water and sewage facilities, and others. Recently, its application has been extended to include head tanks, construction materials, and small-scale bridges which span small rivers.

Type

In general, corrugated steel structure comes in a variety of shapes and sizes since it is a combination of individual steel sheets of different size and thickness.  There exist various section types: round, pipe-arch, ellipse, underpass, arch, high-profile arch, low-profile arch, pear, pear arch, box-culvert, and so forth.  These section types are employed for different situations and usages.  Also, a multi-span type of section utilizing stiffening members allow corrugated plates to be used for larger structures.

2. Specifications

Application Specifications

Korea Industrial Standard (KS) offers standard raw material types and erection methods for corrugated steel plate structures.  It states that the standard for raw materials should be SS400 and the amount of zinc-coating for both sides be more than 900 g/m² Corrugated steel structure sizes are as follows.

Section Type (in Korean) Section Type (in English) Span (mm) Rise (mm) ROUND ROUND 2,000~8,000 2,000~8,000 PIPE-ARCH PIPE-ARCH 1,856~6,204 1,357~3,800 UNDERPASS UNDERPASS 1,733~6,380 1,737~5,223 HORIZONTAL ELLIPSE HORIZONTAL ELLIPSE 5,656~11,191 3,773~6,644 ARCH ARCH 2,000~8,000 1,000~4,000 HIGH-PROFILE ARCH HIGH-PROFILE ARCH 6,017~10,830 2,731~6,118 LOW-PROFILE ARCH LOW-PROFILE ARCH 6,017~11,632 2,147~4,508

Design

Corrugated steel structures employ different design methods according to their applications.  The following is the design method for the most often-used ground structure.

Construction Sequence

Excavation You must comply with excavation rules and regulations specified in the standard specification for road construction.  In the case of burying corrugated plates in the excavated ground, you should make sure that the excavation width should be small enough to erect walls vertically, which is the the most desirable excavation method.   Foundation Ground For solid foundation, you should use good quality material (sand or sandy soil) and pack it down properly.   Erection of Steel Plates  The most common way to erect plates is to assemble individual plates into a complete structure. You first fabricate plates at one end to form a ring and gradually move toward the other end.  The ring will provide stability while the remaining parts of the structure are being erected and also help retain the proper form.   Back Filling  You should use good quality soil for back filling.  Make sure that the height of the left side and the right side is equal.  You should also ascertain that the finishing layer is around 15cm in thickness and the dry density is more than 95%.