| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.19 ( November 1988 ) Steel Pipe ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Development of Long Span Pipe Jacking Method
for Laying Underground Pipe Kohzo Akahide, Tomoya Fujimoto, Eiji Nagano, Hiroshi Sasaki, Takashi Takeuchi, Hatsuji Doi |
| Synopsis: When it is difficult to use the conventional open-cut method for laying pipe underground, a pipe jacking methods is often utilized. In such a case, a longer span is more desirable for actual construction because of the potential cost saving, construction efficiency, minimization of traffic interruption, and other resultant advantages. This paper discusses on improved technique which was implemented by using the Komatsu Iron Mole as a basis and by adding thereto several features such as the pipe laying technique utilizing incremental jacking force, reinforced slurry discharge function, improved direction control devices, etc., in a full-scale field test for a distance of a 200-m span employing 500-mm diameter pipe. The principal results obtained were the following: (1) Long span pipe jacking method was successfully used for a distance of a 200-m straight line. (2) Three types of pipe, namely, double walled pipe, expanded pipe and bare pipe which previously sustained buckling forces were all advanced smoothly through the soil. (3) A procedure for evaluating the main pipe jacking force was confirmed, and brief equations to estimate the maximum jacking force and its probable location were proposed. (4) High precision jacking at an accuracy of }40mm deviation in horizontal as well as vertical directions was achieved. |
| TextiPDF: 8P/343kbj |