#methodsoftunnelinginrock

In This Article We Covers American Method Of Tunneling In Soft Ground. FACTOR AFFECTING THE CHOICE OF A METHOD SIZE OF TUNNELTYPE OF GROUNDAVAILABLE EQUIPMENTMETHOD OF SEQUENCE OF EXCAVATION AMERICAN METHOD In This Method A Drift Driven Into The Top Of The Tunnel, The Drift Supported By Laggings, Caps, And Two Vertical Posts. The Sides Of The Drift Are Then Widened And Additional Support Is Provided Using Timber Planks And Struts. The Process Of Widening Continued Till It Reaches The Springing Level, Wall Plates Fixed At The Springing Level, Which Turn Supported By Vertical Posts. The Vertical Posts Now Occupy The Entire Roof Level, The Posts Supporting The Drift Can Then Removed And Tunneling Work Continued Further In A Similar Manner. American Method Suitable For Large Sized Highway And Railway Tunnels. It Does Not Required Heavy Timbers, Involves Simple Operation. However American Method Unsuitable For Tunnels Of Flat Bottom. SEQUENCE OF OPERATION A Top Drift Driven And Supported By Laggings, Cap Timber And Parts. Side's Widened. Walls Plates Introduced At The Springing Supporting To Arch Set. Then Vertical Posts Driven. Then Sides And Benching Cleared & Tunnel Lining Started. American Method Of Tunneling Thank You For Visiting (Allow Notifications For Further Updates) Check Out Our Video Tutorial Site. Fore Poling Method Of Tunneling Needle Beam Method Of Tunneling Belgian Method Of Tunneling English Method Of Tunneling Classification Of Tunnels Read the full article

In This Article We Covers Methods Of Tunneling In Rock Briefly, Following Method Of Tunneling In Rock, Drift Method Heading And Benching Method Full Face Method Cantilever Car Dump Method NATM Method 1) Drift Method Drift Method Consist Driving Small Sized Heading, Centrally At Top Or Bottom Of Face, Which Later Enlarged By Widening And Benching. This Method Suitable For Large Sized Tunnels In Difficult Or In Hard Rock. Top Drift Method Is Popular And Involves Operation Like, Boring And Blasting A Top Center Of Drift Widening And Enlarging The Drift Benching In Stages Methods Of Tunneling In Rock By Drift Drift Method Is One Of The Methods Of Tunneling In Rock. Drift Method Also Know As Multiple Drift Method. Advantages Of Drift Method A Small Preliminary Section For The Full Length Has Been Accurately Driven, Which Economies Construction. Elaborate Supporting Platforms Not Necessary For Drilling Operations. It Provides Good Ventilation For Workers. Disadvantages Of Drift Method The Enlargent Can Not Started Until Central Hole Constructed For Full Length. Mucking Tracks Required To Shift Frequently, Bench to Bench. This Method Extremely Costly. 2) Heading And Benching Method This Method Involves The Drilling Of The Top Portion In Advance Of Bottom Portion. If Rock Is Hard And Self Supporting, Then Top Heading Advances Ahead By One Round Over The Bottom, So That Heading And Benching Follow Each Other. Read the full article