Ground Displacement at BL29XUL Ground Displacement at BL29XUL 1km Beamline1km Beamline in SPringin SPring 88–– 1km Beamline 1km Beamline –– in SPringin SPring--88

To evaluate possible long-term deformation of the XFEL building, we have surveyed the deviations of the beamline component of BL29XUL from the initial

SPring-8 (1436 m)

surveyed the deviations of the beamline component of BL29XUL from the initial locations.

SPring-8 (1436 m) since 1997

BL29XULHiroaki Kimura1,2）, Shingo Taniguchi1）, Haruhiko Ohashi1,2）, Shunji Goto1,2）,

BL29XULSince 1999

a u o O as , S u j Goto ,Sanae Itakura1） , Takashi Otuska 1）, Sakuo Matsui1）

1)Riken/SPring-8, 2)JASRI/SPring-8

XFEL (700 m)from ~2011

Outline1. History and structure of BL29XUL2. Survey measurement and Result3 U d t t f XFEL b ildi3. Understructure of XFEL building4. Summary

XFEL

Vac Station＃50Vac. Station ＃30

Vac Station＃10

BL29XUL overlapping

cutting 1km Building

Vac. Station＃50Vac. Station＃10

2

Out door section of BL29XUL

1. History1990： Ground breaking

(Max. of thickness of new layer: 55m)1999： Construction of BL29XUL2007： Survey2007： Survey

2．StructureTransport channel

Beam pipe: outside dia. 114mmlength ～900m

V P t ti ：#64 13 6 it h

1km buildingUnderstructure :

Concrete pillars：l th 30Vac. Pump station：#64、13.6m pitch

Understructure： Concrete0.5m thick2m wide

length ～30mcontacted on weathering bedrock.

3

Survey - levelDigital level

Trimble DiNi12for measuring level of basementfor measuring level of basement

Optical levelNikon AS-7

for measuring height of beam pipefrom the basement

4

Result - level Vac. Sta. : 13.6m pitch

-10.0

0.0

10.0

0 10 20 30 40 50 60

Vac. Sta.＃m

m)

-50.0

-40.0

-30.0

-20.0

Leve

l(m

-60.0

50.0

m)

TopView

Side

Alt

i.(m

50m Side

View

Measured Subsidence of #51: 54 mm (7mm / year)of 1km building : 5mm

The shape of the obtained subsidence data was very similar to that ofthe geographical features before the land preparation.

The subsidence is occurred at not only near surface part ofembankment but also all of that. 5

HLS measurement → Poster by C. Zhang

1#1#2#3#4Sensor #5

#5

#31mm/4months1mm/4months

6

Survey - LateralGNSS t GNSS survey system

Topcon Net G3 ×２

(for several points)

Static relative positioning methodIt can use satellites of GPS and GLONASSMeasuring time：12～15min/1pointReproducibility：±1mm（by 5×10min data)Reproducibility：±1mm（by 5×10min data)Precision：±2mm(in data sheets)

→Friday, Dr. Matsui, Oral Presentation

Total station (for all points)

Leica TM5100AWith scale aligned along sight line

and contacted to beam pipeRelative measurement

7

Result-LateralNorth

0.0

10.0

20.0

0 10 20 30 40 50 60

：GNSSra

l(m

m) North

others：TS

-20.0

-10.00 10 20 30 40 50 60

Vac. Sta.＃

Top

Late

r

South

lti.(

m)

50m

View

SideView

Al 5

Lateral: Original line was decided by point #12 and #60

Inclination of supports of beam pipe・Measured data of inclination < 0.15 deg. （→ 5.6mm shift）Initial inclination < 0 2 deg・Initial inclination < 0.2 deg.・The data have not changed systematically.

→ Inclination of supports or basement is disregarded.

Displacement : -12～ +15mm8

Result0.0

10.0 Vac. Sta.＃

)

-30.0

-20.0

-10.0

0 10 20 30 40 50 60

evel

(mm

)

-60.0

-50.0

-40.0

Top

Lelt

i.(m

)

50m

View

SideView

10.0

20.0

Al 5

mm

) North：GNSS others：TS

-10.0

0.0

10.0

0 10 20 30 40 50 60

Late

ral(

m

Vac. Sta.＃-20.0L

South

→ Accelerator section of XFEL building (located at #35 - #64)Ground displacement depends on that of embankment.

Level: Subsidence at #51: 54mm (8mm / year)Lateral: Displacement :～－5～ +15mm 9

→ Accelerator section of XFEL building (located at #35 #64)

Understructure of Undulator sectionAlignment tolerance of component at installation : ±0.1mm

Undulator section Accelerator section

Alignment tolerance of component at installation ±0.1mm

(at final : ±0.01mm → Next talk by Dr. Yabashi)

240m 400mUndulator section Accelerator section

EmbankmentWeathering bedrockBedrockReplacement by excavation with crusher stoneReplacement by excavation with crusher stone

Bedrock or Replacement with crusher stone.(the packing ratio of the weight density: 95%)

→ independent from the displacement of embankment→ very good

subsidence < 2mm/10years

10

Undulator Section

Replacement by excavation with crusher stonecrusher stone

Excavation Operation

11Surface of Bedrock Paving with crusher stone

Understructure of Accelerator sectionAlignment tolerance of component at installation : ±0 3mm

Accelerator sectionUndulator section

Alignment tolerance of component at installation : ±0.3mm

240m 400m

EmbankmentWeathering bedrock

240m 400m

C t ill

gBedrockReplacement by excavation with crusher stone

Concrete pillarTotal #:139 Diameter: 1.5 or 1.6mLength :19-52m (Ave. 30m)

l l b d d d b klateral : bad → depend on embankment level : good,but shrinkage in drying process

10mm/10years for 50m pillar and

Embankment

12

by down force from subsided embankment 5mm/10years for 50m pillar

Bedrock

Accelerator Section

Piling for a foundation of the gbuilding 

・Now all pillars have been piled.p p

Basement Pillar Construction

13Press Fitting of the Pillar CasingPillar Casing Bit with Diamond Blades

XFEL Facility• XFEL building will be completed in March 2009.• Accelerator and undulator will be installed from• Accelerator and undulator will be installed from

autumn 2009.

May 23 2007 Dec 27, 2007

14

May 23, 2007 ,

SummaryObtained data of displacement of BL29XUL can be reflected

to accelerator section of XFEL building.

Displacement of embankment is not small.Subsidence of the building depends on the shrinkage of concrete pillars. ・Concrete pillars shrink in drying process. A d b k t ill ith f icti f id ll f th・And embankment presses pillars with a friction from side wall of these.

Total subsidence is estimated to 15mm/10years for 50m pillar.・Unsupported buildings (utility backyard, side-room…) are going to subside.

Lateral displacement is estimated to -5～15 mm.

to accelerator

Based on these results, we designed : Adjustment stroke of girder Clearance of hole for wave guideClearance of hole for wave guideAbility of steering magnets

Several times of re-alignment is needed.Several times of re alignment is needed.