1. H. KIMURA, K. Kiuchi, T. Kai, N. Azumi, S. Matsui RIKEN/SPring-8 A Floor Deformation of SACLA Building S Pring-8 A ngstrom C ompact Free Electron LA ser

2. Outline 1. Understructure of SACLA Building 2. Long Term deformation a. Floor Subsidence b. Reference Line (V, H) 3. Seasoning deformation a. Monitoring system b. HLS data 4. Summary 2 SPring-8

3. Embankment Weathering bedrock Bedrock Replacement by excavation with crusher stone 33 Pile foundation Concrete pillar Diameter: 1.5 or 1.6m Total :139 Length :19-52m (Ave. 30m) Subsidence ～ 15mm/10years Bedrock or Replacement with crusher stone. Subsidence < 2mm/10years 1. Understructure of SACLA Building Apr. 2007: Building construction starts Mar. 2009: Building completed Apr. 2009: Installation started Oct. 2010: Aging of accelerator starts Feb. 2011: Beam commissioning starts

4. 44 Direct Foundation on the Bedrock Understructure of Light Source Building Bedrock Crusher stone with cement Crusher stone Weathering Bedrock Bedrock Embankment Accelerator Building Light Source Building Undulator section area Artificial Layer replaced with crusher stone (the packing ratio of the weight density: 95%) Subsidence < 2mm/10years 10m Surface of Bedrock Paving with crusher stone Excavation Operation

5. 5 Piling for a foundation of the building Input concrete to hole Press Fitting of the Pillar Casing Pillar Casing Bit with Diamond Blades Accelerator Building Iron reinforcing rod of Pillar Remove soil Remove casing

6. By Dini 03 6 2. Long Term deformation – Floor Subsidence Accelerator Building Area The shape of the subsidence data is very similar to that of embankment. Recent subsidence 0.7mm/year @ Z= 200m Light Source Building Area Recent subsidence is small. History of Floor subsidence from Aug. 2008 Floor Level (actual)

7. Subsidence of top surface of concrete pillar Observed subsidence is agree with that of floor. Subsidence in 10 years is estimated less than 10mm. 7

8. Vertical-Deformation of Reference Line ・ Reference monuments were mounted as a beam line reference. ・ Monuments represent actual reference line. Vertical Standard point +1mm +2mm +1mm Adjusted before installation By Digital Level Accelerator Building Light Source Building Observed subsidence of L.S. Building is 1 mm / 5 years. The Subsidence in 10 years is estimated less than 2 mm.

9. Horizontal-Deformation of Reference Line Horizontal By Survey network with TDA5005 / AT401(2014) Accelerator Building Light Source Building Fixed point Fixed point All measurement have done in summer season. Now, ±0.2 mm@ L.S. Bld. ±2.2mm@ Accl. Bld.

10. 10 ： WPS ： HLS ID Dashed lines were installed in 2011. 60 m 2009/Oct.- 2010/Aug.- 2012/Jan.- 2011/Oct.- 3. Seasoning deformation – Monitoring system Sensor: HLS:FOGALE (Range 2.5mm half-fill) WPS:FOGALE -1D

11. HLS – at Undulator Section 0.1mm 0.6mm/5 years 2009/11/1 2010/1/30 2011/1/25 2012/1/20 2013/1/20 2014/7/9 Bedrock Crusher stone with cement Crusher stone Standard point

12. L. S. Bld. → ← Acc. Bld. Crusher stone with cement Crusher stone Bedrock Weathering Bedrock HLS – at Border between 2 bld. 0.2mm 0.7mm 1.1mm b4 b3 b2 hls id1 hls id2

13. Extensometer using super Inver wire (11m) Extensometer at border part 2012.1-2014.7 Summer 0.6mm Winter L.S. Bld.Accl. Bld. Summer Accl. Bld. L.S. Bld. Floor concretes connects two building. The border part is pushed from both side. 0 0.2 0.4 0.6 Winter

14. Appendix - SACLA NOW BL3 BL1 XSBT BL2 :New 2 nd Linac :New Light Source Building BL2BL3 2nd Linac In this summer, BL2 with 18 undulators and 2nd linac were installed.

15. Subsidence depends on the thickness of embankment layer, not pile length. Observed subsidence for 5 years is 7.4 mm. The value is with in the prediction. 3. Border part between these buildings 1. Accelerator Building : Pile foundation Summary 2. Light Source Building : Replacement with crusher stone Crusher stone with cement is better than that without cement. Observed subsidence for 5 years is 1 mm. The value is with in the prediction. Seasoning vertical deformation 0.8 mm is observed in this part. In summer season, this part is pushed from both building, and raises. Careful design is needed for such part. (Sliding mechanism)