Tunnel construction method using pre-support and post-support and apparatus suitable for same

2:

• The tunneling method of claim 1, wherein in the installing of the post-support member between the plurality of internal pre-support members in the excavation surface of the main tunnel to which the shotcrete is primarily sprayed, the post-support member is installed between the pre-support members in a ceiling part of the main tunnel, and in side wall parts of the main tunnel, only the post-support member is installed.

4:

• The tunneling method of claim 1, wherein in inserting and installing the internal pre-support member in the drilled hole, the internal pre-support member is mounted with a stopper for preventing slip in the drilled hole, a discharge hose and an injection hose are bound to a side surface of the internal pre-support member, a packer for pressurized-grouting is mounted at a tip end of the internal pre-support member of the inner side of the tunnel, the internal pre-support member is inserted into the drilled hole for the internal pre-support member in the original ground of the main tunnel from the pilot tunnel by connecting a connection pipe to the internal pre-support member so that an end part of the internal pre-support member is partially exposed to be connected to the plate type support member at a planned excavation surface of the main tunnel, and then the connection pipe is removed, and the packer is expanded to conduct the grouting and perform curing to thereby connect the internal pre-support member with the plate type support member.

6:

• The tunneling method of claim 5, wherein in the installing of the external pre-support members from the ground surface toward the cross section and the outer side parts of side walls of the cross section of the main tunnel, vertical side wall reinforcing external pre-support members installed at outer sides of left and right side wall parts of the tunnel are installed deeper than a level of a bottom of the tunnel so as to prevent uplift of the bottom.

7:

• The tunneling method of claim 5, wherein in the installing of the post-support member between the external pre-support members in the excavation surface of the tunnel, the post-support member is installed in a part unsupported due to an obstruction, in a case in which the external pre-support members are not sufficiently installed in an upper ground of the cross section of the main tunnel due to the obstruction.

10:

• The tunneling method of claim 1, wherein the pre-support member and the post-support member are fixed to the original ground of the main tunnel by inserting the pre-support member after drilling a hole, and then conducting pressurized-grouting to simultaneously generate an effect of supporting the original ground and a waterproof effect.

11:

• The tunneling method of claim 5, wherein a soil cover depth is replaced with an artificial reinforcement material and the external pre-support member is installed from the replaced soil cover depth to the cross section of the main tunnel and the outer side of the cross section of the main tunnel, in a case in which a soil cover depth of the main tunnel is thin and the ground of the main tunnel is soft.

12:

• The tunneling method of claim 1, wherein the post-support member having a shorter length or a smaller diameter than that of the pre-support member is used.

13:

• The reinforcing steel cage described in claim 8, wherein the reinforcing steel cage is manufactured in a mesh form, or an interval between upper and lower steel rods is formed in a truss form.

14:

• A pre-supported tunnel, wherein the internal pre-support member and the post-support member of claim 1 are installed or the external pre-support member and the post-support member of claim 5 are installed.

17:

• The tunneling method of claim 5, wherein the pre-support member and the post-support member are fixed to the original ground of the main tunnel by inserting the pre-support member after drilling a hole, and then conducting pressurized-grouting to simultaneously generate an effect of supporting the original ground and a waterproof effect.

18:

• The tunneling method of claim 5, wherein the post-support member having a shorter length or a smaller diameter than that of the pre-support member is used.