METHOD FOR INCREASING LONGITUDINAL RIGIDITY OF UNDERGROUND STRUCTURE MADE OF PREFABRICATED COMPONENTS Russian patent published in 2000 - IPC

FIELD: construction engineering. SUBSTANCE: method relates to building and reconstruction of underground and underwater structures such as transportation tunnels which go across floating earth and water obstacles. Method implies creation of stops for tensioning of guy ropes, installation of tensioning device, tensioning of guy ropes from sectional lining in area of crossing floating earth and water obstacles. Components of transportation setup are removed from tunnel. Joints are subjected to overall waterproofing. After that, guy ropes are laid inside tunnel structure beyond limits of obstruction clearance. Guy ropes are located in radially directed conduits which are rigidly fixed in lining. Stops for tensioning of guy ropes are made in the form of reinforced concrete holders. Configuration of holders corresponds to internal contour of tunnel. Holders are rigidly structurally connected with components of lining at sites where tunnel enters stable rock matter. Built directly beyond limits of stop holders is tensioning chamber. Deformation joints are created in lining between tensioning chamber and end surface of holder for loosening of longitudinal links over its perimeter. Deformation joints and caulking grooves in radial direction are filled with water-tight material. After that, rings of tunnel lining are tensioned in longitudinal direction with some eccentricity. Condition for distribution of tensioning forces is determined according to engineering monitoring. Application of aforesaid method allows for setting up active counteraction to development of dangerous deformations of tunnel lining made up of prefabricated components. In also reduces influence of operational vibration loads on thixotropic dilution of floating earth. EFFECT: higher efficiency. 3 cl, 4 dwg