Logbook RailAndCentralPin

Enter comments in reverse time order

Date	Who did it?	Action	Comments	Documents
2017-08-29	Wetteskind, Schröder	Installation of Rail	We finalize the mounting of cover plates on top of the rack. Last measurement of the inner and outer radius of rail runway in height and distance to foundation center. We did this measurement early in the morning before sunrise. After that we removed the measurement jig on top of the central pin.
2017-08-28	Wetteskind, Schröder	Installation of Rail	We start the mounting of cover plates on top of the rack. This day the reshuffling of MERO containers took place (together with the removal of rail containers).
2017-08-26	Wetteskind, Schröder	Installation of Rail	Measurement of the outer radius of rail runway in height and distance to foundation center. This measurement took all day long as we had to make three station movings.
2017-08-25	Wetteskind, Schröder	Installation of Rail	We finalize the tightening of the screws at the faces of the rail with a torque of 800 Nm (M30).
2017-08-24	Wetteskind, Schröder	Installation of Rail	We start to tighten the screws at the faces of the rail with a torque of 800 Nm (M30).
2017-08-23	Wetteskind, Schröder	Installation of Rail	Removing screws on the lower cord of three rail faces because they stick into the grout. Shorten these screws and mount them again. Drill out of the iron from the holes for anchors finalized by Dragados.
2017-08-22	Wetteskind, Schröder	Installation of Rail	Dragados proceeds to drill out the iron from the holes for anchors with a special drilling tool. Measuring inner radius of rail runway in height and distance to foundation center during lunch time. Measuring central pin in height and centering (control measurement after last concrete pouring). Tighten srews of remaining rack segments installed with a torque of 2000 Nm (M30-10.9).
2017-08-21	Wetteskind	Installation of Rail	39 holes for anchors are not deep enough because of hitting iron during drilling. Dragados starts to drill out the iron with a special drilling tool. Preparation of site for assembly and integration of bogies (by IFAE people, see separate log book?). Preparation of wooden pieces to support azimuth bogie knots after integration onto the bogies (to prevent tilting of knots).
2017-08-16 to 2017-08-17	DRAGADOS	Installation of Rail	Proceeding with drilling of holes through pedestals into the foundation for anchors and gluing them into holes.
2017-08-11	DRAGADOS	Installation of Rail	Removal of mold for last concrete pouring at central pin. Proceeding with drilling of holes through pedestals into the foundation for anchors and gluing them into holes.
2017-08-10	DRAGADOS	Installation of Rail	Pouring the last quarter of rail ring with grout inbetween pedestals. Drilling of further holes through pedestals into the foundation for anchors. Gluing of anchors into holes.
2017-08-09	DRAGADOS	Installation of Rail	Pouring of concrete at central pin. Preparation of formwork for the last quarter of rail ring.
2017-08-08	Wetteskind, Stürzer	Installation of Rail	Installation of remaining rack segments (with crane). Fixation of screws only with low torque. Clean-up of site. Boxes with elevation drive arch shifted closer to the fence. Emptying of MBM containers (bogies with accessories shifted to the foundation of the camera access tower). Measuring inner radius of rail runway in height and distance to foundation center. Measuring central pin in height and centering (control measurement before last concrete pouring). Pouring the third quarter of rail ring with grout inbetween pedestals (done by Dragados). Preparation of mold for last concrete pouring at central pin (done by Dragados). Pouring is foreseen with fibrated concrete (quality H-35) to reduce cracks after hardening.
2017-08-07	Wetteskind, Stürzer	Installation of Rail	Tighten srews of first 4 rack segments installed with a torque of 2000 Nm (M30-10.9). Glueing test with 5 anchors for pedestals (glue amount per hole is 110 ml). Problems with screws fixing the lower connections plates: They are a bit too long (stick out of the plates and into the grout). They have to be exchanged against shorter ones. Preparation of formwork for the third quarter of rail ring (done by Dragados).
2017-08-05	Wetteskind, Stürzer	Installation of Rail	Measuring inner radius of rail runway in height and distance to foundation center. Clean-up of site.
2017-08-04	Wetteskind, Stürzer	Installation of Rail	Measuring outer radius of rail runway in height and distance to foundation center. Pouring the second quarter of rail ring with grout inbetween pedestals (done by Dragados). Performing further test drills through pedestals into foundation for anchors (done by Dragados).
2017-08-03	Wetteskind, Stürzer	Installation of Rail	Finalization of height adjustment of pedestals. Preparation of formwork for the second quarter of rail ring (done by Dragados). Performing first test drills through pedestals into foundation for anchors (done by Dragados).
2017-08-02	Wetteskind, Stürzer	Installation of Rail	Further adjustment of pedestals in height. Pouring the first quarter of rail ring with grout inbetween pedestals (done by Dragados).
2017-08-01	Wetteskind, Stadler, Stürzer	Installation of Rail	Starting with final adjustment of pedestals in height (inside and outside of rail ring). Preparation of formwork for the first quarter of rail ring (done by Dragados).
2017-07-28 - 2017-07-31	Wetteskind, Stadler, Stürzer	Installation of Rail	Installation of 4 rack segments on top of the rail (with forklifter). Further investigation of rail behaviour. Trying to improve the situation with different measures (e.g opening and closing connection plates between segment faces) - without success. Decision: We ignore this problem for the time being and concentrate on the final adjustment of pedestals (levelling them all in the same height).
2017-07-27	Wetteskind, Stadler	Installation of Rail	Remeasuring rail height and distance to foundation center. No improvement of rail tilting observed. Restarting of pedestal adjustment. We think a deeper investigation of the rail behaviour is useful.
2017-07-27	Jablonski, Stürzer	Installation of Central Pin	Checking position of central pin. No movement. Removal of Elevationdrivepodest from container.
2017-07-26	Wetteskind	Installation of Rail	Readjustment of pedestals with the goal to level them out. Attempt to reduce effect of friction. Removal of fluid rubber on top part of anchor bars.
2017-07-26	Jablonski	Installation of Central Pin	Checking position of central pin. No movement. Positioning rods tightened.
2017-07-25	Wetteskind, Schlammer	Installation of Rail	Early measurement of rail height and distance to the foundation center during dawn. Found same tilting around rail cross section axis but effect is less and in reverse order than measured the day before (height of rail running surface at outer radius partly bigger than at the inner one).
2017-07-25	Jablonski, Dettlaff	Installation of Central Pin	Repeating measurment of central pin. Movement of 1mm realignment.
2017-07-24	Wetteskind, Schlammer	Installation of Rail	Final setting down of the rail onto the pedestals and removal of airpads. Checking of rail height and distance to the foundation center. Detecting tilting of rail around its cross section axis. Effect was found about noon and results in bigger height of rail running surface at the inner radius than at the outer one. Assuming effect is due to thermal expansion in combination with friction between rail base and sliding plates of pedestals.
2017-07-24	Jablonski, Dettlaff	Installation of Central Pin	Leveling of Bearinghead with Top Cross. Installation of 16x rubber sealing for anchor-rods of central pin. Tightening of flange on bottom of central pin. Alignment of central pin with TDRA 6000 relativ to telescope coord system. Filling of top part of anchor rods with fluid rubber (Kemperol).
2017-07-21	Wetteskind, Schlammer	Installation of Rail	Further setting down of the rail onto the pedestals and removal of airpads. Checking of rail height and distance to the foundation center.
2017-07-21	Jablonski, Dettlaff	Installation of Central Pin	Alignment of pin. Preparation to fill top part of anchor bars with fluid rubber.
2017-07-20	Wetteskind, Schlammer	Installation of Rail	Starting of setting down the rail onto the pedestals and removal of airpads. Checking of rail height and distance to the foundation center.
2017-07-20	Jablonski, Dettlaff	Installation of Central Pin	Installing Adjustable feet for Central Pin. Placing of central pin at foundation center. First measure of central pin
2017-07-19	Jablonski, Schlammer, Dettlaff	Installation of Central Pin and Rail	Measuring and aligning rail. Measure points at connection. control of height and radius.
2017-07-18	Jablonski, Wunderl, Schlammer, Dettlaff	Installation of Central Pin and Rail	Loosening of cooper plates. Checking and loosening of pedestals.
2017-07-12	Jablonski, Stadler, Wunderl, Schlammer	Installation of Central Pin and Rail	Checking Central pin and additional parts.
2017-07-11	Jablonski, Stadler, Wunderl, Schlammer	Installation of Rail	Tightening of screws around the running surface of the rail. Assembly of connection plates between segment faces. Discovering a misalignment of some connection plates with holes on the segment faces. Checking of rail height and distance to the foundation center.
2017-07-10	Wetteskind, Stadler, Wunderl, Schlammer	Installation of Rail	Preparation of pneumatic connections between compressors and airpads. Positioning of grippers for pulling rail segments horizontally against foundation center. Closing gap by controlled pulling of segments at different positions while airpads are stowed by compressed air. Starting assembly of rail pedestals.
2017-07-08	Wetteskind, Stadler, Wunderl, Schlammer	Installation of Rail	Placing of remaining 3 rail segments on top of airpads. Again align them in height and distance to the foundation center. Placing of last segment with a gap of ~30 mm to the next-to-last segment.
2017-07-07	Wetteskind, Stadler, Wunderl, Schlammer	Installation of Rail	Placing of next 7 rail segments on top of airpads. Again align them in height and distance to the foundation center.
2017-07-06	Wetteskind, Stadler, Wunderl, Schlammer	Installation of Rail	Placing second rail segment on top of next two airpads. Installation order of segments has to be counter-clockwise when looking from top onto the foundation. Align both segments in height and distance (radius) to the foundation center.
2017-07-05	Wetteskind, Stadler, Wunderl, Schlammer	Installation of Rail	Placing first two airpads and align them in height. Placing first rail segment on top of the airpads. Placing and alignment of next airpads.
2017-07-04	Wetteskind, Stadler, Wunderl, Schlammer	Preparation of Site	Preparation of all needed tools and measurement devices. Checking of proper vertical distance between concrete ring and rail. Making marks on foundation for placing airpads.