The construction can be divided in phases:

1. Removal of half of the railing. Removal of the screwed oakfloor. This work was already considered from the beginning. Level and paint the wall.
2. Making of the Construction-drawing of the supportbeam. A metalworking made this beam. This beam leans on the concrete floor. Making of an iron-support for the platform of the staircase.
3. Lengthening of the oak-floor. After the event it was quite a job to get planks with the same demensions and grooves as the old ones.
4. Making a the rounding in the plexiglass-steps so they fit into the rounting-strip of 15 mm deep. I have made a special machine accessory for my rounting-table to make this rounding.
5. The sawing en glueing of the 4 hard Maple planks to make two 2 stairsbeams.
6. Varnish the stairsbeams, 3 layers of parquetlac on the basis of water so it discoloured less.
7. Routing of 48 grooves. This was two days of work. I did this in my long corridor. For this routing-work I had made a special template to get the needed accuracy of the grooves. The steps have been numbered on both sides and have to situated on the similar numbering of the stairbeams. All grooves had a clearance of 0,5 mm. It was a delight to see that everyting fits perfect.
8. Have an Iron support built to support the stairbeams at the top. The concrete-sawcut was not squared in several ways. So I had to fill the space between this support and the concrete.
9. Sawing to size of the stairbeams. Outlining of the steps, the angle & level. This is quite difficult.
10. Glueing of the plexiglas-steps in the stairbeams. I have fully tested the gluejoint with a test-step. The joint was even strong as the hardwood and plexiglas. A crack did not appear in the gluejoint. First I have glued the steps on one beam, aligned to the other beam. After that I have glued all 12 steps at once to the other beam. This was a crucial job because the 2 component-glue had a procestime of only 15-20 minutes. After that it became too viscous. In 20 minutes you have to put the glue on any place to be joint and get the stairbeam on all the steps with the use of glue-clamps and a rubber hamer. A nervous job! If you use too much glue it will became difficult to remove all the surplus glue. This job I have done in the stair opening, so the stairs of 110 Kg was allready almost in its place.
11. Fortunate the stairs could be turned around in the stair opening. I made a temporary support, so it became possible to get the stairs in its final postion. Two of colleagues helped me hereby in 10 minutes time ;-)
12. The stairs was in his place. The stairbeams have four points of support which has to fill up to spread the pressure equable. This to anticipate cracks in the future.
13. During the the crucial glueing of the steps some of the plexiglas support-beams came ± one millimete away from the steps. These gaps were filled with plexiglas-strips.
14. Finishing the underside of the staircase-platform. Installation of electricity for the platformlamp.
15. Design and production of the platformlamp.
16. To finish the existing railing in the angle of the staircase, so it will stand out better. A iron construction was designed for this, which supported the existing metal beam (in the middle of the railing) which had to be cut in half to get in line with the stair. This iron construction guaranteed enough rigidity of the railing. These phase consist of many consecutive steps and through that it was time-devouring.