first and second flat insulation members 28 30 slightly below the ledges 40 the reinforcing bars 38 extend into the cement or concrete of the respective first and second sections 12 14 and have down turned elbows 45 for secure engagement to such sections 12 14 also spanning the passageway 32 in an area approximately midway between the upper surfaces 16 and lower surfaces 18 is a length of polyvinylchloride pvc pipe 44 having a diameter for example about 3 u2033 sufficiently large to receive therein cement as it is being introduced into a mold for forming the block 10 the pvc pipe 44 extends through apertures 46 in the respective first and second flat insulation members 28 30 and extends a short distance into each of the respective first and second sections 12 14 the reinforcing bars 38 and the pvc pipe 40 are positioned in the respective apertures 42 and 46 of the first and second flat insulation members prior to pouring cement or concrete in the mold used for forming the architectural concrete structure 10 upon pouring the cement into the mold cavity the elbows 45 of the reinforcing bar 38 will be encased by the cement and the open ends of the pvc pipe 44 will receive cement sufficiently to completely fill the pvc pipe 44 as shown in the breakaway section of the pipe in fig1 as will be appreciated in addition to providing reinforcing the reinforcing bars 38 maybe used for gripping and lifting the blocks 10 there is.