In This Article We Covers Belgian Method Of Tunneling In Soft Ground.
FACTOR AFFECTING THE CHOICE OF A METHOD
- SIZE OF TUNNEL
- TYPE OF GROUND
- AVAILABLE EQUIPMENT
- METHOD OF SEQUENCE OF EXCAVATION
BELGIAN METHOD
Belgian Method Used For Moderately Firm Or Hard Soils.
In Belgian Method, Heading Widened Sideways, And Supported By Additional Crown Bars On Sill.
SEQUENCE OF OPERATION
A Top Heading ‘abcd’ For Full Rise Of The Arch Driven & Supported.
Heading Is Widened Sideways, And Supported By Additional Crown Bars On Sill.
Lining The Arch.
Inserted The Shore At Side And Excavate The Mop.
Shoring Removed And Space Filled With Masonry.
ADVANTAGES OF BELGIAN METHOD OF TUNNELING
- In Belgian Method We Uses Lighter Timber Section.
- We Can Start Work From Different Points Simultaneously.
- Completing First The Construction Of Roof Arch Which Exposed To Greater Pressure And Then Constructing Side Walls And Inverts.
- Redirection Cost As The Muck Cars Can Be Taken Up to The Farthest End In The Centre Trench.
DISADVANTAGES OF BELGIAN METHOD OF TUNNELING
- Settlement And Cracks In Arch Masonry Due To System Of Underpinning Of The Built Arch, Particularly When Avoidable Subsidence Of The Soil May Takes Place.
- But Settlement Is Reduced By Using R.C.C Arches.
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