Method of making covering wall of tunnel made by shield type excavator

Claim 1

A method of making a covering wall on a peripheral wall surface of a tunnel extending behind a shield type excavator, said method comprising the steps of preparing a plurality of form assemblies respectively comprising a form segment for use in casting concrete for forming a primary covering wall and a timbering member for reinforcing said primary covering wall, said step of preparing the form assemblies including the step of detachably coupling said form segment to said timbering member; installing a covering-wall form structure, said step of installing the form structure including the step of assembling the covering-wall form structure from said form assemblies with their timbering members opposed to said peripheral tunnel wall surface; casting concrete into a space defined between the peripheral tunnel wall surface and said covering-wall form structure to form the primary covering wall; and removing the form structure after said cast concrete has set, said step of removing the form structure including detaching the form segments from the timbering members but leaving the timbering members installed against the primary covering wall of the set concrete.

Claim 2

A method of making a covering wall on a peripheral wall surface of a tunnel extending behind a shield type excavator, said method comprising the steps of preparing a plurality of form assemblies respectively comprising a form segment for use in casting concrete for forming a primary covering wall and a timbering member for reinforcing said primary covering wall, said step of preparing the form assemblies including the step of detachably coupling said form segment to said timbering member; installing a covering-wall form structure, said step of installing the form structure including the step of assembling the covering-wall form structure from said form assemblies with their timbering members opposed to said peripheral tunnel wall surface; casting concrete into a space defined between the peripheral tunnel wall surface and said covering-wall form structure to form the primary covering wall; and removing the form structure after said cast concrete has set, said step of removing the form structure including detaching the form segments from the timbering members but leaving the timbering members installed against the primary covering wall of the set concrete.

Claim 7

A method of making a covering wall on a peripheral wall surface of a tunnel extending behind a shield type excavator, said method comprising the steps of preliminarily preparing a plurality of arcuate form assemblies respectively comprising an arcuate form segment for use in casting concrete for forming a primary covering wall and an arcuate timbering member for reinforcing said primary covering wall, said step of preliminarily preparing the form assemblies including the step of detachably coupling the form segments to said timbering members so that the outer surfaces of the form segments and the timbering members are flush with each other; installing an annular primary coveringwall form structure, said step of installing the form structure including assembling the annular covering-wall form structure from said form assemblies with said flush outer surfaces of the form segments and timbering members opposed to said peripheral tunnel wall surface; casting concrete into a space defined between the peripheral tunnel wall surface and said flush outer surfaces of said annular primary covering-wall form structure to form the primary covering wall; removing the form structure after said cast concrete has set, said step of removing the form structure including detaching the form segments from the timbering members but leaving the timbering members installed on and against the primary covering wall of the set concrete; and making a secondary covering wall on the primary covering wall, said step of making a secondary covering wall including installing a secondary form structure with respect to the timbering members left on the primary covering wall and feeding wall material between the primary covering wall and the secondary form structure to thereby embed the timbering members in the wall material.

Claim 8

A method of making a covering wall on a peripheral wall surface of a tunnel extending behind a shield type excavator, said method comprising the steps of preliminarily preparing a plurality of arcuate form assemblies respectively comprising an arcuate form segment for use in casting concrete for forming a primary covering wall and an arcuate timbering member for reinforcing said primary covering wall, said step of preliminarily preparing the form assemblies including the step of detachably coupling the form segments to said timbering members so that the outer surfaces of the form segments and the timbering members are flush with each other; installing an annular primary coveringwall form structure, said step of installing the form structure including assembling the annular covering-wall form structure from said form assemblies with said flush outer surfaces of the form segments and timbering members opposed to said peripheral tunnel wall surface; casting concrete into a space defined between the peripheral tunnel wall surface and said flush outer surfaces of said annular primary covering-wall form structure to form the primary covering wall; removing the form structure after said cast concrete has set, said step of removing the form structure including detaching the form segments from the timbering members but leaving the timbering members installed on and against the primary covering wall of the set concrete; and making a secondary covering wall on the primary covering wall, said step of making a secondary covering wall including installing a secondary form structure with respect to the timbering members left on the primary covering wall and feeding wall material between the primary covering wall and the secondary form structure to thereby embed the timbering members in the wall material.