epoxy having a minimum compressive strength of 6 000 psi and a minimum bond strength of 1000 psi such as an astm c 881 type vi bonding system normal penetration requirements range from a minimum of about 7 ft up to possibly 20 ft or more with most installations being around 12 ft and is normally determined by a desired resistance being obtained in the soil penetration as can be appreciated when used the epoxy is not of a fast setting type preferably allowing a series of precast segments to be placed since some degree of movement may be expected as the pile segments are added and driven into the ground the need for epoxy between the segments of the pile is dependent on the nature of the soil into which they are driven normally the weight of the structure will be enough to maintain the contact between the segments also the cooperating interlocking components may have slots and lugs to secure the segments from the vertical movement with or without an adhesive the process of installing may include steps of removing a volume of earth from beneath a portion of a structure positioning a first pile segment below said portion of said structure placing a jack between said first pile segment and said portion of said structure driving a first pile segment a distance into unexcavated earth the.