TBM main beam support design

Alex Vamvakas

31/10/18

Considerations

• Independent girders

• Lower cost

• Easy to assemble and install

• Integrated features

Girder section preliminary design

• Steel

• Standard rectangular hollow section

• 250*150*12mm

• 100kg/2m

• Supported in • 2 points – Gaussian points

• 3 points – extremities and middle

250 mm

150 mm

12 mm

3 points suport

• 3 vertical support points• Minimizing sag

• Combination of movement allows for roll and pitch control

• 2 transversal points• Close to the extremities to maximize

resolution

• 1 longitudinal point• In the middle

• Active or not

Degrees of freedom

2 point support

• 27um max sag

• Eigen frequencies:• 134.71

• 182.73

• 300.03

• 320.13

• 435.15

• 511.12

3 point support

• 5um max sag

• Eigen frequencies:• 199.14

• 300.85

• 477.83

• 495.92

• 523.5

• 555.42

K-module

• New girder and actuators

• Adjustable support for every SAS

• Spiral loads

• New compact loads for RF network

Courtesy Y. Cuvet

Integrated movers

• Movers are integrated on the girder

• Flexure based joints

• WPS are attached directly on the girder

• WPS need to open diagonally or supported slightly differently

Vertical DoF

Horizontal DoF

Vertical installation

• Movers are assembled on the girder beforehand

• Minimizing work in the tunnel

• One single connection for electronics

• One single connection for cooling

Top plate remains attached on the girder

Wires are not disturbed

Ground plate

SAS adjustable support

• 6 DoF support based on flexures and wedges

Courtesy J. Vainola

2 beam module

• Support system is identical

• Adjustable supports on DBQs

• PETS are fixed

• New components are introduced here as well

2 beam module

• Height reduced to 1m from 1.2m

• Waveguides need further layout optimization

Common RF

Common RF girder

• RF unit with pre-assembled SAS, PETS, girder and actuators

• 3 supporting points

• DBQ on active support

• DBQ is supported on the same plate

Common RF girder

• WPS directly on the girder, close to the beam line

• Whole assembly removed vertically