Method of and apparatus for building thin lining on tunnel
AssigneeOkumura Corporation
InventorsSusumu Murakami, Satoshi Fujita
Life of this patent
Estimating the term…
Abstract
A method and an apparatus for building a thin lining on a tunnel to be excavated. The method includes the steps of boring a slot along an outer periphery of a cross section of the tunnel, filling lining material into the slot so as to form the lining material into the thin lining and removing bedrock surrounded by the thin lining so as to expose the thin lining. The apparatus includes a boring device for boring a slot in the tunnel and an injection device for injecting lining material into the slot. The boring device further includes a hollow frame, a plurality of rods fitted axially movably into the hollow frame, and a drive mechanism for rotating the rods and striking rear ends of the rods.
Claims18
A method of building a thin lining on a tunnel to be excavated, comprising the steps of:
- boring a slot along an outer periphery of a cross section of said tunnel with boring means such that said slot extends over a predetermined depth in a direction of excavation of said tunnel;
- introducing lining material into said slot during withdrawal of said boring means from said slot so as to form said lining material in said slot as a thin lining;
- and
- removing bedrock surrounded by said thin lining so as to expose said thin lining.
An apparatus for building a thin lining on a tunnel to be excavated, comprising:
- removable boring means for boring a slot in said tunnel, said boring means comprising:
- a hollow frame;
- a plurality of rods each having a bit formed at a front end thereof, which are axially movably fitted into said hollow frame so as to be arranged in parallel with each other;
- a drive mechanism for rotating said rods and striking the rear ends of said rods;
- and
- injection means for injecting lining material into said slot;
- said injection means comprising:
- an injection hose which is connected with a rear end portion of said hollow frame such that said lining material is injected, through said hollow frame, from a front end portion of said hollow frame into said slot.
A method of building a thin lining on a tunnel to be excavated, comprising the steps of:
- boring a slot along an outer periphery of a cross section of said tunnel with boring means such that said slot extends over a predetermined depth obliquely outwardly in a direction of excavation of said tunnel;
- withdrawing said boring means from said slot;
- introducing lining material into said slot so as to form said lining material in said slot as a thin lining;
- and
- removing bedrock surrounded by said thin lining so as to expose said thin lining.
Dependencies are inferred from the claim text.