GEOBRACE 254 - RMD Kwikform...Technical Data Sheets Metric Specification European Technical Office...

European Data Sheet 1

© The information contained within these data sheets remain the property of RMD Kwikform and is not to be altered or reproduced without permission.

RMD Kwikform reserves the right to change any specification without giving prior notice.

Date: 19/12/2019 Issue : GB03

GEOBRACE 254 TRENCH LINING SYSTEM

Technical Data Sheets Metric Specification

European Technical Office Brickyard Road, Aldridge, Walsall WS9 8BW, UK.

Telephone: +44 1922 743743

Email: [email protected] Website: www.rmdkwikform.com

EN1090

EN14653




Date: 19/12/2019 Issue : GB03


Contents Ref Description Page

Contents Contents 2 Introduction 3

1.0 Components and Load Capacities GBX25405 GeoBrace 254 Extension 500mm 4

GBX25410 GeoBrace 254 Extension 1000mm 4







GeoBrace 254 Extensions - Section properties 5

GBX25400 GeoBrace 254 Ram Unit 400kN 6

GBX25506 GeoBrace Ram Unit Lock Off Plate 25mm 7

GBX25507 GeoBrace Ram Unit Lock Off Bar 7

GBX55008 GeoBrace 550 Ram Unit Lock Off Hook 7

GeoBrace Ram Unit Lock Off Assembly 8

GBX25401 GeoBrace 254 Pin 59x335mm o/a 8

BVU70001 8mm R-Clip BZP 8

MSX10051 Megashor M20 Skirt Nut 8

GBX25403 GeoBrace 254 Megashor Connector 9

GBX01000 GeoBrace Forged Steel Shear Stop 670kN 10

GBX25404 GeoBrace 254 Inclined Prop Connector 11

GBX25501 GeoBrace 254 Support/Uplift Bracket 1 12

GBX25502 GeoBrace 254 Support/Uplift Bracket 2 12

GBX25500 GeoBrace 254 Retention Angle 13

GBX25403 GeoBrace 254 Uplift Bracket 3 14

Support & uplift Brackets Bolted to Concrete Structures 15

Support & Uplift Brackets Welded to Steel Sheet Piles 16

GBX25491 GeoBrace-DAMB Adapter 1 17




VAU10019 4 Leg Chains 3mtr - SWL 6.7TON 10mm 19

VAU10020 4 Leg Chains 5mtr - SWL 6.7TON 10mm 19

VAU10012 RChain - 4.7T Shackle-Shackle 2500/13 19

VAU10013 RChain - 4.7T Shackle-Hook 2500/13 19

VAU10002 Double Acting Bucket Pump 19

VAU10005 1/4” Hose M/F ISO B 3.0m - 350 Bar 19

VAU10006 1/4” Hose M/F ISO B 6.0m - 350 Bar 19

Graph 254/1 - Allowable Working Loads - Simply Supported Beams (Sheet to Sheet) 20

Graph 254/2 - Allowable Working Loads - Simply Supported Beams (Pin to Pin) 21

Graph 254/3 - Working Load Envelope - Combined Axial / Bending / Shear 22

Graph 254/4 - Interaction at Supports - Combined Axial / Bending / Prop Load 23

Graph 254/5 - Interaction at Supports - Combined Axial / Bending / Shear 23

Table 1 - Component Makeup for a GeoBrace 254 Assembly with Ram Unit 24

Contact Details: International Offices 25

CONTENTS




Date: 19/12/2019 Issue : GB03


INTRODUCTION

Introduction Comprising of 8 different lengths of leg extension & a hydraulic ram unit which simply pin together at the joints, the

RMD Kwikform GeoBrace 254 system is used typically with trench sheets or sheet piles to create small to medium

cofferdams and for the construction of manholes, chambers & tanks. The unique twin pin arrangement at the joints

between components provides full moment capacity at any position along the span as well as an integral shear stop for

knee brace props.

Suspended from the trench sheets with restraining chains or supported on brackets, the GeoBrace 254 bracing frames

are able to clear span up to 12.5m in both directions and are fully compatible with the larger GeoBrace 390 and 550

units and the smaller Double Acting Manhole Brace range enabling different sizes of brace to meet at the corners of

rectangular excavations.

Design to EN Standards

The RMD Kwikform GeoBrace 254 system has been designed in accordance with EN14653. To facilitate a simplified

scheme design using established permissible load methods, load performance data in this document is displayed as

an ‘Allowable Working Load’. Should Limit State Design be required, the Design Resistance may be obtained by

multiplying the Allowable working load by 1.5.




Date: 19/12/2019 Issue : GB03


COMPONENTS

Code Description Weight

GBX25405 GeoBrace 254 Extension 500mm 209 kg








GeoBrace 254 Extensions

Used in conjunction with the GeoBrace 254 Ram Unit to support trench sheets or piles in small to medium sized

excavations.

Allowable Bending Moment with no co-existent axial load = 405kNm

Allowable Bending Moment at joint with no co-existent axial load = 405kNm

500mm Extension

1000mm Extension 1500mm Extension

168

308

60 Ø holes

Pin to Pin Dimension Varies (listed in product description) 105 105

267

Plan Lifting point

Elevation

259

Section

295

295

259

(longer lengths similar)

267

308

Integral shear stop C Pin L C Pin L

4 knuckle end 3 knuckle end




Date: 19/12/2019 Issue : GB03


COMPONENTS

GeoBrace 254 Extensions - Section Properties

Lifting Point Stiffener Hole Details

60 Ø lifting point rated for a maximum lift of 95kN

81

Centerline

of GeoBrace

133.5 133.5

500mm Extension

1500mm Extension

2000mm Extension

4000mm, 6000mm & 8000mm Extensions

GeoBrace Lifting Point Stiffener Positions

360 780 ctrs

360 360 1280 ctrs

Section Properties

Area: Gross 137 cm²

Flange Thickness 20.5 mm

Web Thickness 13.0mm

Steel Grade S450 JO

I xx 17500 cm4

I yy 15900 cm4

R xx 11.3 cm

R yy 6.57 cm

Z xx 1310 cm³

Z yy 457 cm³

EI xx 36800 kNm²

EI yy 33400 kNm²

V max xx 600 kN

M max xx 405 kNm

M max xx joint >405 kNm (UC Limits)

M max yy 190 kNm

M max yy joint >190 kNm (UC Limits)

Y Y

X

X

1000mm Extension

500 500

360

3000mm Extension

360 360 1140 ctrs 1140 ctrs

360 360 1140 ctrs 1140 ctrs 1000 ctrs (repeats)

500




Date: 19/12/2019 Issue : GB03


COMPONENTS

GeoBrace 254 Ram Unit 400kN (GBX25400) weight 798kg

Used in conjunction with GeoBrace 390 Extensions to affect fine

length adjustment, pre-loading and load release.

The Ram Unit consists of 2 fabricated steel box sections (an

inner and an outer) with integral lifting & suspension points. The

inner section hydraulically extends by 900mm.

Allowable BM at the overlap fully extended 405kNm

Varies - 2000mm to 2900mm Pin to Pin

168

C Pin L

308

276

260

326

380

60 Ø holes Plan

Elevation

105 105

Corner Joint Connection Intermediate Joint Connection

2 No. GeoBrace 254 Pin 59x335mm

& 8mm R-Clip BZP

(GBX25401 + BVU70001)

1 No. GeoBrace 254 Pin 59x335mm

& 8mm R-Clip BZP

(GBX25401 + BVU70001)

C Pin L

For angles above 180° move pin position to other hole

*

Allowable Axial Load 400kN




Date: 19/12/2019 Issue : GB03


COMPONENTS

GeoBrace 254 Ram Unit Lock Off Plate 25mm (GBX25506) weight 57.1kg

GeoBrace 254 Ram Unit Lock Off Bar (GBX25507) weight 1.36kg

Used in pairs at the rear of the Ram Casing inner and enabling connection of Rapid

Bar Ties and nuts to support and restrain the Lock Off Plate 25mm (GBX25506).

GeoBrace 550 Ram Unit Lock Off Hook (GBX55008) weight 1.12kg

Load tested and certified lifting accessories used in pairs engaged with the holes

along the edge of the Packing Plate to enable connection with lifting slings.

(Secured in place with 5mm R-Clips).

Rated for a maximum Safe Working Load of 180kg

9 No. Ø21 Holes at 100mm ctrs

Section

100

Elevation

300

240

1000

25

100 8mmx30mm chamfer both ends

Elevation Section

2 No. female tapped threads to

suit 15mm Rapid Bar Tie

240 27.5 27.5 295

25

25

122

210

Ø6 Hole

Ø60 Hole

Ø20 Bar

Elevation

Used to pack between the two sections of the GeoBrace 254 Ram Casing where

hydraulic load lock-off is required. Cut the plate accurately to length to suit

measured in-situ Ram Unit extension.

Place the chamfered end of the plate against the cast end plate of the Ram Unit to

avoid fouling of the projecting weld in this location. Both ends of the original plate are

chamfered enabling two shorter packing plates to be cut from one original.

The squareness and flatness of the cut-to-length in both axes must be

controlled within a 1mm tolerance to ensure correct bearing of the cut end

on the end of the Ram Casing.




Date: 19/12/2019 Issue : GB03


GeoBrace 254 Pin 59x335mm o/a (GBX25401) weight 7.1kg

Megashor M20 Skirt Nut (MSX10051) weight 0.08kg

Used when connecting the 254 Brace Megashor Connector to a Megashor

Screw jack to centralise the prop accurately on the GeoBrace 254 web.

8mm R-Clip BZP (BVU70001) weight 0.14kg

Used in conjunction with GeoBrace 254 Pins.

65

13 Ø hole 25

335

59

329

COMPONENTS

GeoBrace Ram Unit Lock Off Assembly

Used with the GeoBrace 254 Ram Unit in applications where a mechanical axial load lock-off is required enabling the

hydraulic cylinder to be de-pressurised.


GBX25506 GeoBrace 390 Ram Unit Lock Off Plate 30mm 96.7 kg

GBX25507 GeoBrace 550 Ram Unit Lock Off Bar 3.20 kg

GBX55008 GeoBrace 550 Ram Unit Lock Off Hook 1.12 kg

BTX10150 Rapid Tie Bar 15mm x 1500mm 2.12 kg

BTX10001 Knock On Wing Nut 0.32 kg

GeoBrace 254 Lock-off Bar x 2 placed as near to the ends of the Lock-off Plate as possible

4 No. Rapid Bar tie 15mm x 375mm long (cut from 1500mm long bar) and 4 No. Rapid Bar Tie Knock on Wing Nuts.

Ensure that the ties are engaged through the full thickness of the Lock off Bars

Grade 8.8 pin used in conjunction with 8mm R-Clips for connecting GeoBrace 254

Extensions and Ram Units end to end.

The allowable shear load in a GeoBrace 254 joint made with one or two pins which

is limited by the web of the plate girder = 600kN

The allowable shear across the 8 shear planes of the pin joint in line with the axis

of the GeoBrace 254 = 2410kN

Place plate chamfer here so that the plate seats correctly without fouling weld between Ram Unit inner and knuckle end




Date: 19/12/2019 Issue : GB03


15

55

50

COMPONENTS

GeoBrace 254 Megashor Connector (GBX25403) weight 20.4kg

Used to connect Megashor or Tubeshor 320 props to GeoBrace 254 Extensions. Can

also be used to connect inclined Megashor or Tubeshor 320 props to Geobrace 254

Extensions where the vertical component of the inclined prop load does not exceed

75kN - see bottom of sheet 11 for similar detail.

400

400

300

200

200

67

4 No. 22 Ø CSK holes

Section

Ensure that the welded clamp is placed at the top for horizontal props and at the bottom for raking props.

Axis of

Megashor Knee Brace Connection to Beam

4 No. M20x60 CSK Bolts gr8.8 BZP & M20 Hex Nuts gr8 BZP

Assemble components so that the Megashor Push Pull Prop Pivot contacts the integral Geobrace 254 shear stop

Tubeshor 320 Connection to Beam

Ensure that the Megashor Push Pull Prop Pivot is placed such that the M42 Bolt is vertical to avoid eccentric loading of the GeoBrace 254 web

M42x200 Bolt gr8.8 BZP & M42 Hex Nut gr8 BZP

Maximum load that can be transferred to an integral shear stop

1200kN

Elevation




Date: 19/12/2019 Issue : GB03


COMPONENTS

GeoBrace Forged Steel Shear Stop 670kN (GBX01000) weight 5.60kg

Used individually to transfer shear generated from ‘knee brace’ props into GeoBrace

254 Extensions.

Maximum allowable shear through each plate 670kN.

Shear Stop Detail

Plan Side Elevation End Elevation

166

120

50

120 166

Weld Dimensions

for faces marked ‘B’

14

Weld Dimensions

for face marked ‘A’

A B

B B

A

B

B

B

15 18

Note: Weld sizes can be pro-rated according to actual load applied.




Date: 19/12/2019 Issue : GB03


A heavier duty unit used to connect inclined Megashor or Tubeshor 320 props to

GeoBrace 254 Extensions where the vertical component of the inclined prop load

does not exceed 75kN. . May also be used to connect horizontal Megashor or

Tubeshor 320 props and knee braces.

75

25

Section

COMPONENTS

490

GeoBrace 254 Inclined Prop Connector (GBX25404) weight 37.8kg

100 100 50 14

5 10

0 10

0

490

300

8 No. 22 Ø CSK holes

Once loosened, clamps can be rotated through 90° to facilitate connection to GeoBrace 254 Extensions

Axis of

GeoBrace

Elevation

Note: Where uplift loads are transferred between the 254 Megashor Connector and welded or bolted Uplift Brackets by the GeoBrace flange as shown, carry out combined load checks on the GeoBrace flange.

Inclined Tubeshor 320 Connection to Beam

M42x200 Bolt gr8.8 BZP & M42 Hex Nut gr8 BZP

7 No. M20x60 CSK Bolts gr8.8 BZP & M20 Hex Nuts gr8 BZP

Assemble components so that the M42 bolt is below the level of the Geobrace 254 centreline to minimise eccentric loading




Date: 19/12/2019 Issue : GB03


COMPONENTS

GeoBrace 254 Support /Uplift Brackets

Versatile reversible self colour units used either to support the underside of the

GeoBrace 254 Extensions and Ram Unit during use or inverted above the Inclined

Prop Connector Plates to resist the uplift forces induced by a raking prop. Can either

be welded to Sheet Piles or bolted to Concrete Capping Beams or D-Walls.

GeoBrace 254 Support/Uplift Bracket 1 is for general support use whereas Bracket 2

is used locally to provide a heavy duty support where a Tubeshor prop is supported

by the GeoBrace 254 Extensions.

For allowable working loads, bolt and weld connection details refer to sheets

15 & 16.


GBX25501 GeoBrace 254 Support/Uplift Bracket 1 12.9 kg

GBX25502 GeoBrace 254 Support/Uplift Bracket 2 18.2 kg

Weld Face Details

Bolt Face Details

Bracket 2

Elevation on Bracket 2

350

350

76

200

26

185

60

115

100

4 No. 26 Ø holes

2 No. 17.5 Ø CSK holes


60

100

185

Weld Face Details

Bolt Face Details

Bracket 1

Elevation on Bracket 1

350

350

60

230

26

135

60

80

100

4 No. 18 Ø holes



60

100

135

Orange text




Date: 19/12/2019 Issue : GB03


COMPONENTS

Option 1

M16x50 Bolts gr8.8 BZP

& M16 Hex nuts gr8

289

Option 2 Option 3

M16x50 CSK Bolts gr8.8

BZP & M16 Hex nuts gr8 350

Option 4

GeoBrace Retention Angles bolted to top plate of

GeoBrace 254 Support/Uplift Bracket.

GeoBrace Retention Angles bolted to underside of

top plate of GeoBrace 254 Support/Uplift Bracket.

GeoBrace 254 Retention Angle (GBX25500) weight 0.58kg Used to prevent the GeoBrace Extensions and Ram Unit from falling from the GeoBrace 254

Support/Uplift Brackets bolted to a concrete surface, the GeoBrace 254 Retention Angle can

be fixed in two different orientations to accommodate additional packing between the

GeoBrace and Sheet Piles where sheet driving tolerance dictates (see options 2 and 4 below).

60

60

8

8

Section

33 34 33

20 60

35 12

17.5 Ø holes 20

Plan




Date: 19/12/2019 Issue : GB03


COMPONENTS

GeoBrace 254 Uplift Bracket 3 (GBX25503) weight 34.0kg

Used above GeoBrace 254 Inclined Prop Connector Plates to resist larger uplift

forces induced by a raking prop. Can either be welded to Sheet Piles or bolted to

Concrete Capping Beams or D-Walls.

For allowable working loads, bolt and weld connection details refer to sheets

15 & 16.

Bolt Face Details

Elevation

350

80 Ø lifting point

500

75

100

185

6 No. 26 Ø holes

170

170

Orange text

115

15




Date: 19/12/2019 Issue : GB03


COMPONENTS

Support & Uplift Brackets Bolted to Concrete Structures

Support/Uplift Bracket 1 2 3

AWL (kN) 40 50 90

Number of grade 8.8 ATR anchors 4 4 6

ATR diameter and thread M16 M24 M24

Embedment Depth (mm) 250 250 300

Anchor design calculations have been carried out using the full bracket allowable working load and grade 8.8 all-thread

rod (ATR) fixed into 50N/mm2 cube strength un-cracked concrete using Hilti HIT-HY 200-A Injection Mortar in

accordance with the manufacturer's recommendations.

Un-reinforced concrete has been assumed and no account has been taken of edge or end distances. It is also

assumed that appropriate strength grout is placed between the bracket and the prepared concrete surface.

The design, supply and correct installation of the anchors and grout for the applied loads are the responsibility of the

Customer.

Support/Uplift Brackets 1 & 2 (Support Application)

255

Load anywhere

in this area

Support/Uplift Brackets 1 & 2 (Uplift Application)

255

Load anywhere in this area

Uplift Brackets 3 & 4

255





Date: 19/12/2019 Issue : GB03


COMPONENTS

Support & Uplift Brackets Welded to Steel Sheet Piles

Sheet Steel

Grade

Fillet Weld

Number

Bracket 1 2 3

AWL 60 75 125

S235

1 Throat 6.8 9.9 19.1

Leg 9.6 14.0 27.0

2 Throat 3.0 3.0 4.3

Leg 4.2 4.2 6.1

3 Throat None None 7.7

Leg None None 10.9

S275

1 Throat 6.0 8.3 17.0

Leg 8.5 11.7 24.0

2 Throat 3.0 3.0 3.8

Leg 4.2 4.2 5.4


Leg None None 9.2

S355

1 Throat 5.6 7.4 15.8

Leg 7.9 10.5 22.3

2 Throat 3.0 3.0 3.6

Leg 4.2 4.2 5.1


Leg None None 7.4

1

2 2

3

Support/Uplift Brackets 1 & 2 (Support Application)

255


1

2 2

3

Support/Uplift Brackets 1 & 2 (Uplift Application)

255


Uplift Bracket 3

255


2 2

3

1

Weld Dimensions

Leg

Weld sizes may be pro-rated according to applied load/AWL for the bracket however we recommend a minimum site

weld throat dimension of 3mm. It is the Customer’s responsibility to adjust the weld size in-situ to suit steel thickness,

site conditions and welding methods. The sheet pile shall be at least equal in thickness to the weld throat dimension.

It is the Customer's responsibility to ensure that the sheet piles are not locally overstressed by bracket forces or weld

connections and to weld the clutches between sheets or add shear plates as needed to prevent the ejection of

individual sheets by uplift forces.




Date: 19/12/2019 Issue : GB03


Used to connect a Double Acting Manhole Brace Leg A, B or C to the end of a

GeoBrace 254 Extension or GeoBrace 254 Ram Unit 400kN.

COMPONENTS

GeoBrace-DAMB Adapter 1 (GBX25491) weight 30.0kg

200

422

148 16

8

120

306


120

210

63.5 Ø holes

42 Ø hole

Side View End View

30 20

205

427

148

168

150

306

170

210

63.5 Ø holes

42 Ø hole

Side View End View

20 20 20

GeoBrace 254 Pin 59x335mm & 8mm R-Clip BZP x 2 (GBX25401 + BVU70001)

Manhole Brace Tee Pin 40mm & R-Clip x 100mm (HFU10000 + VAU10043)



Used to connect a Double Acting Manhole Brace Leg A, B or C to the end of a





Date: 19/12/2019 Issue : GB03


COMPONENTS



210

432

150 16

8

150

306

150

210

63.5 Ø holes

42 Ø hole

Side View End View

30 20

207

429

150

168

180

306

200

210

63.5 Ø holes

42 Ø hole

Side View End View

20 20 20

Used to connect a Double Acting Manhole Brace Leg D, E or F to the end of a




Used to connect a Double Acting Manhole Brace Leg D, E or F to the end of a







Date: 19/12/2019 Issue : GB03


COMPONENTS

4 Leg Lifting Chains

Used for lifting complete 254 Brace frame assemblies or when unloading individual leg assembles. SWL 6.7 tonnes


VAU10019 4 Leg Chains 3mtr - SWL 6.7TON 10mm 30.0 kg

VAU10020 4 Leg Chains 5mtr - SWL 6.7TON 10mm 60.0 kg

HD Restraint Chains - Blue (SWL - 4.7t)


VAU10012 RChain - 4.7T Shackle-Shackle 2500/13 9.2 kg

VAU10013 RChain - 4.7T Shackle-Hook 2500/13 10.6 kg

Double Acting Bucket Pump (VAU10002) weight 18.0kg

A double acting hydraulic pump used to extend or retract each of the 254 Brace leg assemblies in turn.

Note: The pump is normally supplied with shoring fluid within the tank. Supplementary

shoring fluid is available in litre bottles for use with the pump. Mixing instructions for the

ratio of shoring fluid to water will be dependent on temperature conditions and are

specified on the shoring fluid packaging.

Hydraulic Hoses For Use With Double Acting Bucket Pump


VAU18001 Shoring Fluid Concentrate - 1 Litre 1.20 kg


VAU10005 1/4" Hose M/F ISO B, 3.0m - 350bar 0.8 kg

VAU10006 1/4" Hose M/F ISO B, 6.0m - 350bar 1.6 kg

VAU10007 1/4” 3-Way Bridle Hose Set 6.0m - 350bar 4.0 kg

It is the Customer’s responsibility to provide longer and higher load capacity lifting chains if large assemblies of equipment are to be moved.




Date: 19/12/2019 Issue : GB03


DESIGN DATA

Allowable Working Loads - Simply Supported Beams (Sheet to Sheet)

0

Allo

wab

le U

DL

(kN

/m)

Span of GeoBrace 254 Beam - Sheet to Sheet (m)

8

Mid

span

Ela

stic

Def

lect

ion

(mm

)

0

200

400

Axial Loads / kN

Graph 254/1

20

40

60

80

100

120

140

160

180

0

40

60

80

100

120

140

160

180

10 12 7 13 9 11

20

6 5




Date: 19/12/2019 Issue : GB03


DESIGN DATA

Allowable Working Loads - Simply Supported Beams (Pin to Pin)

0

Allo

wab

le U

DL

(kN

/m)

Span of GeoBrace 254 Beam - Pin to Pin (m)

7 8 9 10 11 12

Mid

span

Ela

stic

Def

lect

ion

(mm

)

0

Graph 254/2

20

40

60

80

100

120

140

160

180

60

80

100

120

140

160

180

0

200

400

Axial Loads / kN

40

20

6 5 4

200

220

200

220




Date: 19/12/2019 Issue : GB03


DESIGN DATA

0

500

0 50 100 150 200 250

100

Bending Moment (kNm)

She

ar F

orce

(kN

)

Graph 254/3

400

300

200

300 350 400 450

Design of Continuous Beams with or Without Knee Braces

It is not possible to produce graphs covering the design of these applications as

there are too many variables; carry out analysis on a case by case basis. Care is

needed to correctly consider axial compression arising as a result of connection with

braces joining at the excavation corners (A) and knee brace props joining the 254

Brace at angles (B). Compression loads are carried by the GeoBrace flanges and

joint pins remote from the supported wall. Critical points for consideration occur at

point B and where props intersect the GeoBrace 254 (C). In these locations hogging

bending moments also result in compression loads in the inner flanges which are

additive to induced axial loads. In the mid-span (D), sagging bending moments

place the inner flanges in tension which are reduced by the magnitude of any

induced axial load. Deflection in the mid-span will also move the line of induced axial

load towards the neutral axis of the GeoBrace section. For large excavations where

supported perimeter walls have adequate in-plane stiffness, such as in D-wall or

secant pile construction, it may be possible to shed axial loads from the GeoBrace

254 sections into the supported walls near the corners of the excavation by the use

of substantial shear stubs welded to the wall-side flange of the GeoBrace which

project and are grouted into purpose designed pockets cut into the perimeter wall.

This allows fuller use of the allowable GeoBrace section bending moment in areas

of hogging moment towards the central part of the excavation.

Working Load Envelope - Combined Axial / Bending / Shear

A

B

C

D

Knee Brace

Cross Prop

Mid Span

Supported Wall

0 500

1000

1500

A

xial

Loa

ds /

kN




Date: 19/12/2019 Issue : GB03


0 200 400 600 800 1000 1200

DESIGN DATA

Interaction at Supports - Combined Axial / Bending / Prop Load Graph 254/4

Interaction at Supports - Combined Axial / Bending / Shear Graph 254/5

0 100 50 150 200 250

400

300

200

100

0

Ben

ding

Mom

ent (

kNm

)

Shear Force (kN)

Prop Load (kN)

400

300

200

100

0

Zone A values have been limited due to the partial lateral and rotational restraint of the plate girder compression flange

in accordance with BS5975 table K1 and for values of shear that do not exceed 55% of the prop load.

Separate calculations are required to access Zone B values in which detailed consideration is given to the lateral and

rotational restraint of the girder compression flange in order to reduce the effective length of the plate girder web.

Zone A Zone B

Zone A Zone B

300 500

500

1000

1500

0 Axial Loads / kN

500

1000

1500

0 Axial Loads / kN

Ben

ding

Mom

ent (

kNm

)

350 400 450




Date: 19/12/2019 Issue : GB03


DESIGN DATA

Table 1 - Component Makeup for a GeoBrace 254 Assembly with Ram Unit

Note: All legs are supplied fully assembled with 1 extra pin & R clip at the end to connect at the corner. If connecting

end to end as parallel walers rather than a square or rectangular frame 1 extra pin & R clip will be required

per leg.

In order to minimise initial deflection caused by pin hole tolerances assemble the brace with the longest

possible extensions in the middle and position shorter lengths at the ends. When assembling braces in

accordance with RMDK drawings, follow the makeup shown.

Leg

Type Kit Code

Sheet to Sheet

Dimension (mm) GBX25400 GBX25405 GBX25410 GBX25415 GBX25420 GBX25430 GBX24401 BVU70001

Weight

(kg)

Pin Hole

Deflection

(mm)

GBX25440 GBX25460 GBX25480

min max Ram Unit 500mm

Extension

1000mm

Extension

1500mm

Extension

2000mm

Extension

3000mm

Extension

59x335mm

Pin

8mm

R-Clip

4000mm

Extension

6000mm

Extension

8000mm

Extension

1 KTU16001 2476 3376 1 1 1 805 9

2 KTU16002 2976 3876 1 1 3 3 1030 13

3 KTU16003 3476 4376 1 1 3 3 1080 16

4 KTU16004 3976 4876 1 1 3 3 1140 19

5 KTU16005 4476 5376 1 1 3 3 1200 23

6 KTU16006 4976 5876 1 1 1 5 5 1420 34

7 KTU16007 5476 6376 1 1 3 3 1310 29

8 KTU16008 5976 6876 1 1 1 5 5 1530 40

9 KTU16009 6476 7376 1 3 3 1420 33 1

10 KTU16010 6976 7876 1 1 1 5 5 1650 42

11 KTU16011 7476 8376 1 1 5 5 1700 41 1

12 KTU16012 7976 8876 1 1 5 5 1760 44 1

13 KTU16013 8476 9376 1 3 3 1650 38 1

14 KTU16014 8976 9876 1 1 1 7 7 2030 50 1

15 KTU16015 9476 10376 1 1 5 5 1930 44 1

16 KTU16016 9976 10876 1 1 5 5 1990 60 1

17 KTU16017 10476 11376 1 3 3 1870 41 1

18 KTU16018 10976 11876 1 1 1 7 7 2260 50 1

19 KTU16019 11476 12376 1 1 5 5 2150 46 1

20 KTU16020 11976 12876 1 1 5 5 2210 48 1

Type Pin to Pin (mm) Clear Internal (mm)

DAMB (A-C) 172 382

DAMB (D-F) 202 442

GeoBrace 254 476 652

GeoBrace 390 720 920

GeoBrace 550 1050 1240

To obtain the pin to pin, or clear internal dimensions for the GeoBrace 254 leg from the sheet to sheet dimension,

subtract the following offsets:

Sheet to Sheet

Pin to Pin

Clear Internal

Table 2 - Dimension Conversions

Note: Table 1 sheet to sheet dimensions assume that GeoBrace 254 legs are used on both adjoining sides of the

excavation. If using any other size of GeoBrace legs or DAMB leg assemblies on the adjoining sides, calculate the

GeoBrace 254 pin to pin dimension by subtracting 476mm from the sheet to sheet dimensions in Table 1 and add the

relevant values from Table 2 to find the new sheet to sheet dimensions.




Date: 19/12/2019 Issue : GB03


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GEOBRACE 254 - RMD Kwikform...Technical Data Sheets Metric Specification European Technical Office...

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