Pile Design and Construction Practice, Fifth edition

(2) The allowable bond stress between the anchor and the grout
(3) The allowable bond stress between the grout and the rock
(4) The dead weight of the mass of rock and any overlying soil which is lifted by the anchor,
if prior failure does not occur due to the preceding three factors and
(5) The dead weight of the mass of rock and any soil overburden which is lifted by a group
of closely spaced anchors.

The allowable bond stress between the anchor and the grout depends on the compressive
strength of the grout, the amount of keying or roughening given to the steel surface, the

Piles to resist uplift and lateral loading 317

Drilling pipe removed

Steel tubular pile

Grout plug

Sea bed

Spiral shear connector

(12 mm M.S.bar)

Shear connectors

51 mm (2") I.D

grout injection pipe

Grout

Open drill

hole

Sealing plate

311 mm (12¼") diameter

expendable

drilling bit

Top of hard

rock

Spacer

244.5 mm(9 ")O.D.

anchor tube

(^58)
Figure 6.11‘Dead’ anchor in raking steel tubular pile for mooring dolphin.