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Piping construction: Caterpillar D5C XL crawler tractor with side mounted pipe layer boom and Deere 200C crawler mounted hydraulic backhoe support large bore steel underground steel pipe in trench with pipe slings. Workers are happy to help hold pipe in position. Dixboro Bridge, Ann Arbor, 2004
Trench construction, safety: Caterpillar 3128 crawler mounted backhoe straddles trench for underground pipe. Worker in trench is fine grading/cleaning trench with shovel. Workers standing in 8 ft deep trench have no support against sidewall collapse. Safety and laws require the trench walls to be supported or sloped back at depths greater than 5 ft. Michigan 2006
Underground construction: Hyundai R55 crawler mounted hydraulic backhoe/excavator digs street drainage/ storm sewer trench. Flexible corrugated sewer/ drainage tubing is coiled in trench. Sewer manhole structure is in foreground. Depot Street, Ann Arbor, 2004.
Earthmoving/ trenching construction, safety: Trench shield/box constructed of side walls of double steel plates with hollow core, tapered cutting edges at bottom, and large diameter pipe interior spreaders to resist exterior soil pressures. The width of the shield is determined by length of spreaders, and lengths are easily changed, which makes shield width quite flexible. Trench shield extends from bottom of trench to above top of excavation and protects the workers inside it from possible trench wall cavein. Dark spots on side walls are rain drops on this rainy day. First Street, Ann Arbor, Michigan 2006.
Earthmoving/ trenching construction, safety: Trench shield/box constructed of side walls of double steel plates with hollow core, tapered cutting edges at bottom, and large diameter pipe interior spreaders to resist exterior soil pressures. Trench shield extends from bottom of trench to above top of excavation and protects the workers inside it from possible trench wall cavein. Dark spots on side walls are rain drops on this rainy day. First Street, Ann Arbor, Michigan 2006.
Trench construction, safety: Caterpillar 3128 crawler mounted backhoe supports large pipe section/spool in trench in constructing underground pipe. The 8 ft deep trench is so deep that the two workers installing the pipe cannot be seen in this photo. The trench has no support against sidewall collapse. Trenches 5 feet (1.5 meters) deep or greater require a protective system unless the excavation is made entirely in stable rock, and this soil is not stable rock. Worker safety (and the law) also require that workers have easy, close exit from trenches, which pipes crossing the trench prevent. Michigan 2006
Trench construction, safety: Caterpillar 3128 crawler mounted backhoe moves large pipe section/spool into trench to construct underground pipe. Workers standing in 8 ft deep trench have no support against sidewall collapse. Near worker is applying pipe joint lubrication in preparation for inserting pipe spool/segment into previously placed pipe. Worker safety and the law require: (1) Trenches 5 feet (1.5 meters) deep or greater must be supported or sloped back unless the excavation is made entirely in stable rock, and this soil is not stable rock. (2) Workers must have easy, close exit from trenches, which pipes crossing this trench prevent. Michigan 2006
Trench construction, safety: Caterpillar 3128 crawler mounted backhoe moves large pipe section/spool into trench to construct underground pipe. Workers standing in 8 ft deep trench have no support against sidewall collapse. Worker safety and the law require: (1) Trenches 5 feet (1.5 meters) deep or greater must be supported or sloped back unless the excavation is made entirely in stable rock, and this soil is not stable rock. (2) Workers must have easy, close exit from trenches, which pipes crossing this trench prevent. Michigan 2006
Trench construction, safety: Caterpillar 3128 crawler mounted backhoe moves large pipe section/spool into trench to construct underground pipe. Workers standing in 8 ft deep trench have no support against sidewall collapse. Near worker is applying pipe joint lubrication in preparation for inserting next pipe spool/segment. Worker safety and the law require: (1) Trenches 5 feet (1.5 meters) deep or greater must be supported or sloped back unless the excavation is made entirely in stable rock, and this soil is not stable rock. (2) Workers must have easy, close exit from trenches, which pipes crossing this trench prevent. Michigan 2006
Piping construction: Caterpillar D5C XL crawler tractor with side mounted pipe layer boom and Deere 200C crawler mounted hydraulic backhoe support large bore steel underground steel pipe in trench with pipe slings. Workers are happy to help hold pipe in position. Dixboro Bridge, Ann Arbor, 2004
Piping construction: Caterpillar D5C XL crawler tractor with side mounted pipe layer boom and Deere 200C crawler mounted hydraulic backhoe support large bore steel underground steel pipe in trench with pipe slings. Workers are happy to help hold pipe in position. Dixboro Bridge, Ann Arbor, 2004
Piping construction: Caterpillar D5C XL crawler tractor with side mounted pipe layer boom and Deere 200C crawler mounted hydraulic backhoe support large bore steel underground steel pipe in trench with pipe slings. Workers are happy to help hold pipe in position. Dixboro Bridge, Ann Arbor, 2004
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