2341 Diaphragm construction (0) In situ concrete poured using a displacement system to form footings and walls 2342 Pressure injected footings (0) Footings constructed by the injection of cementitious grout into the voids of granular material 2343 Ground anchors (0) Installing soil and rock anchors & soil nails for soil stabilization and for tying and holding retaining walls and the structural frame