Meer context zou helpen, maar ik doe een poging:

Stekanker = (wellicht trekanker?) = anchor wall ? = a buried plate,wall or block,some distance from a sheet pile or other retaining wall,which serves to anchor back the wall through a tie between the two.The dead man (!?) is held in place by its own weight and by passive pressure from the soil


Hoeklas = corner weld or fillet weld

Hoeklijnen = Angle line, of simpelweg corners (?)

Draadeind = stud
any of a number of slender, upright members of wood, steel, etc., forming the frame of a wall or partition and covered with plasterwork, siding, etc.

Stel-, hijsvoorziening = scaffolding and hoist platform ?

Niet veel, maar ik hoop dat het je op weg helpt.

'stud' is also correct for draadeind, but with the meaning of a length of threaded rod

Dutch term (edited): hoeklas

A fillet weld is the weld connecting two metal surfaces that are joined at an angle. (i.e. 2 perpendicular pieces of sheet metal)