Method and apparatus for feeding a tunnel roof support system from the roof shield of a TBM
AssigneeC & M McNally Engineering Corp.
InventorsMichael P. McNally, Christopher McNally
Life of this patent
Estimating the term…
Abstract
A primary support for a tunnel roof comprising elongated lagging members which are “extruded” from tubes forming a shield for a tunnel boring machine. The lagging is inserted into the tubes at different times so as to avoid having the ends of adjacent lagging members coincide. As the tunneling machine progresses in the direction of boring, the lagging members emerge from the shield tubes to form a primary tunnel roof lining. Ring beams or arc beams may be installed as required by means of rock bolts or other fastening means.
Claims10
A tunnel boring machined (TBM) comprising a boring head mounted for rotation in said TBM;
- conveyor means for removing material produced by said boring head, propulsion means to move said TBM in the direction of tunneling, roof shield means mounted on said TBM to prevent tunnel debris from falling on said TBM;
- said roof shield comprising a plurality of closely spaced elongated hollow tubes mounted on a framework to conform to the shape of the tunnel on said TBM to permit said shield to have freedom to move in predetermined directions;
- said shield extending from a point just behind said boring head to the rear of said TBM.
A method of constructing a continuous roof for a tunnel comprising;
- providing a tunnel boring machine (TBM) having means to remove material from a tunnel face and transport said material away from said TBM;
- propulsion means on said TBM to move said TBM in the direction of boring;
- providing a roof shield for said TBM having storage means in said shield for storing and delivering lagging members from said roof shield as said TBM moves in the direction of tunneling;
- securing said lagging members to said tunnel after said lagging members have been delivered a predetermined distance from said TBM shield.
A method of forming a continuous lining of closely spaced lagging members for the roof of a tunnel comprising;
- feeding said lagging members from receptacles in the roof shield of a tunnel boring machine (TBM) as said TBM moves in the direction of tunneling so that any joints formed by individual lagging members are staggered,
- fastening said lagging members at predetermined intervals to the tunnel roof
A bridge for use in construction of a tunnel to prevent tunnel roof debris from falling on persons and equipment working behind a tunnel boring machine (TBM) comprising:
- a plurality of lagging members being supported at one end by a shield mounted on said TBM and extending in a predetermined spaced parallel relationship from receptacles formed in said shield of a TBM, to a supporting rib mounted in said tunnel a predetermined distance behind said TBM.
Dependencies are inferred from the claim text.