pivot 56 a pneumatic line 58 is connected to the cylinder 48 and extends to a source of air under pressure from a conventional and well known source not shown herein clamp 16 includes a pair of fasteners 60 and 62 best shown in fig3 fastener 60 is mounted in a generally u shaped bracket 64 and fastener 62 is mounted in a like u shaped bracket 66 the u shaped brackets 64 and 66 are welded to jaw 22 fastener 60 includes a head 68 mounted in bracket 64 and a threaded shank 70 fixed to head 68 a nut 72 is threadedly mounted on threaded shank 70 in a like manner fastener 62 includes a head 74 mounted in bracket 66 with a threaded shank 76 fixed to head 72 a conventional nut 78 is threadedly mounted on threaded shank 76 a slotted ear 80 is welded to base 20 and includes a slot 82 for receiving threaded shank 70 a slotted ear 84 is welded to base 20 and includes a slot 86 for receiving threaded shank 76 clamp 16 with the clamp apparatus is initially inserted into excavation 14 with clamp jaw 22 in an open position the clamp with the closure apparatus is moved laterally and then vertically so that the clamp is positioned with clamp base 20 on pipe 10 so that stand tube 30 extends radially away from pipe 10 and is perpendicular to the pipe positioning of the clamp with the closure apparatus.