Some interesting guniting work was recently accomplished at the plant of the St. Mary’s Cemtne Co. Ltd., St. Mary’s, Ont., where three steel kiln stacks were coated with gunite in order to make them self-supporting,
Shotcrete Repairs in Barbados? A Caribbean Experience
Challenges associated with the placement of concrete vary depending on the conditions in which the project is undertaken.
2006 Outstanding International Project: Reform and Expansion of Bridgetown Port
The Port of Bridgetown on the island of Barbados was originally constructed in the early 1960s and expanded in the mid-1970s
A Report from the ITA Working Group on Shotcrete Use
Working Group 12, Shotcrete Use of the International Tunneling and Underground Space Association (ITA) was established in 1989.
Shotcrete Repairs—the Main Development Trend in Poland
The shotcrete method first appeared in Poland in the 1930s.
Freeport’s New Barmac Delivers High-Quality Shotcrete Sand
In November 1936, during a climbing expedition to the glacier-capped peaks of central New Guinea, Dutch Petroleum Geologist Jean Jaques Dozy discovered a massive copper mineralized outcrop
Slope Stabilization Using the Shotcrete Grid Beam System in Japan
Continuous grid beam structures made of shotcrete have been used for over 30 years in Japan to stabilize natural and man-made cut slopes. This slope stabilization structure, generally called œGrid Beam, is widely applied in Japan. It was used in more than 4600 slope stabilization sites in Japan in the year 2002 alone. The Grid Beam system is often used independently to protect slope surfaces from erosion, or used as a supporting structure, combined with ground anchors or soil nails to stabilize the slope against failures. The area surrounded by the beams is often revegetated to improve aesthetics and harmonize the installation with the surrounding environment (see Fig. 1). Due to the geometric flexibility of this system, the concrete beams can easily follow the undulations of natural slopes and maintain good contact with the surface.
The Use of Macro-Synthetic Fiber-Reinforced Shotcrete in Australia
Macro-synthetic ber-reinforced shotcrete (SnFRS) has rapidly gained popularity in Australia over the past 5 years. This can be attributed mainly to the huge improvement in post-crack performance that has been demonstrated over recent years and the almost universal adoption of this material for ground support by the underground mining industry.
Sissach’s Saved by a Bypass
The small village of Sissach, near Basel, in Switzerland is one of the nicest Swiss villages in the country, but the serenity is plagued each rush hour by heavy commuter traffic. The solution was a bypass tunnel running through the Chienberg hill to the north side of the village. Shallow cover, unconsolidated material at the portals, a TBM pilot tunnel, and the potential for squeezing ground conditions distinguish the Sissach tunnel from many tunnels currently under construction in Switzerland.
The 2284 m (7500 ft) long Sissach bypass tunnel runs a maximum of 120 m (395 ft) beneath the Chienberg hill and beneath the picturesque homes of the Sissach village. It was originally intended to run the two-lane bidirectional bypass up and over the hill on the surface, but protests by the local villages forced the local Canton government to adopt an underground route for the heavy commuter traffic currently passing through the village.
To accommodate the shallow underground route, the alignment is divided into three separate sections: a section of 550 m (1800 ft) cut-and-cover and 200 m (656 ft) cover and cut on the west end, followed by a 1440 m (4725 ft) length of mined tunnel, and a 94 m (308 ft) section of cut-and-cover at the east end.
The first 550 m (1800 ft) of cut-and-cover on the west end of the project was completed under a separate contract and included the boxed section over the Ergolz River. The contract for the main bypass civil works, including the mined tunnel, was awarded to the Arge Chienbergtunnel Sissach, a joint venture led by the Batigroup, Switzerland™s
Shotcrete for Underground Support IX
The Japan Tunnelling Association (JTA) and International Tunnelling Association (ITA) sponsored the Shotcrete for Underground Support IX Conference held in Kyoto, Japan, from November 17-20, 2002. It is a cooperative conference with the United Engineering Foundation, New York, which sponsored the previous eight conferences, the first of which was held 30 years ago. A total of 35 papers were presented at the conference, 34 of which are published in a proceedings available from the JTA. The conference was chaired by Koichi Ono, Professor, Kyoto University, Japan, and co-chaired by D. R. (Rusty) Morgan, Chief Materials Engineer, AMEC Earth & Environmental Limited, Vancouver, British Columbia, Canada.
The conference was a resounding success. It was attended by over 70 delegates, with papers from Japan, South Korea, Vietnam, India, Canada, Brazil, France, Finland, Norway, and Switzerland. Keynote addresses were given by Koichi Ono from Japan on œShotcrete Use in Tunnelling Works in Japan (over 2 million m3 per annum); Minema Ikoma from the Japan Railway Construction