H. KIMURA, K. Kiuchi, T. Kai,

N. Azumi, S. Matsui

RIKEN/SPring-8

A Floor Deformation

of SACLA Building

SPring-8 Angstrom Compact Free Electron LAser

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

Embankment

Weathering bedrock

Bedrock

Replacement by excavation with crusher stone

3 3

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 4

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

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

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)

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

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.

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

：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

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

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

Extensometer using super Inver wire (11m)

Extensometer at border part 2012.1-2014.7

Summer 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 Winter

Winter

Appendix - SACLA NOW

BL3

BL1

XSBT

BL2 :New

2nd Linac :New

Light Source Building

BL2 BL3 2nd Linac

In this summer, BL2 with 18 undulators

and 2nd linac were installed.

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)