LIQUEFACTION COUNTERMEASURE CONSTRUCTION METHOD FOR EXISTING UNDERGROUND PIPE

摘要

PROBLEM TO BE SOLVED: To provide a liquefaction countermeasure construction method for an existing underground pipe which can simply and at a low cost suppress the uplift and others due to liquefaction of an existing underground pipe such as a gas pipe laid in a foundation having a non-liquefaction layer such as a gravel layer in a surface layer part or a foundation having the surface layer part coated with asphalt pavement.SOLUTION: In a foundation having risk of liquefaction which has an asphalt pavement 11 in a surface layer part, in the upper part of the foundation where an underground pipe 1 is laid, a plurality of consolidated bodies 12 are integrally formed with the underground pipe 1 and at a spacing in the tube axis direction of the underground pipe 1 so as to apply a weight to the underground pipe 1. A support body 13 is formed so as to support the underground pipe 1 downward from the top between the consolidated body 12 and the asphalt pavement 11. The weight and interval of each consolidated body 12 and the number and interval of the support body 13 are set so as to suppress the rotation of the consolidated body and the uplift and rotation of the underground pipe 1 due to liquefaction.SELECTED DRAWING: Figure 1