Page 56 - SMM2 eBOOK

SECTION H

UNDERPINNING

Generally

H.1 Information

1. Underpinning work shall be given as a section in the bills of quantities.

2. The location and extent of the work and particulars of the existing structure to be
underpinned shall be shown on the drawings required under clause B.3.1. or shall be
shown on further drawings which shall accompany the bill of quantities.

3. Information regarding the nature of the ground shall be given in accordance with clause
D.1.

4. The limit of length to be carried out in one operation and the number of sections the
Contractor may be permitted to undertake at any one time shall be stated.

5. Underpinning which may be carried out from both sides, or which is required to be carried
out from one side only or from within an existing building shall each be given separately
and so described.

6. Underpinning which is curved on plan shall be so described.

Work in all trades

H.2 Excavation

1. Temporary supports to work to be underpinned shall be given as an item, stating any
particulars requirements.

2. Excavation shall be given in accordance with clauses D.9-10 subject to the following:

a. Excavating preliminary trenches down to the level of the base of the existing
foundation shall be so described.
b. Excavating below the level of the base of the existing foundation shall be so
described.

3. Cutting away projecting foundations shall be given in metres stating the number of
courses of footings and the dimensions of concrete to be removed.

4. Preparing the underside of the existing work to receive the pinning up of the new shall be
given in metres stating the width of the existing work.

H.3 Disposal of water

Disposal of water shall be given in accordance with clauses D.15-16.

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