CFS TENSION ROD SYSTEM PROTAH 04

CFS TENSION ROD SYSTEM PROTAH

CONTENTS

CFS Tension Rod System PROTAH 04-03

Tension Rod Bars 04-04

Forks 04-05

Locking Nuts & Pins 04-06

Components of the System PROTAH 04-07

Anchor Disc for Cross Bracing 04-08

Design of the Tension Rod 04-08

Load Capacity of the Tension Rod System 04-09

Connecting Plates - Dimensions 04-10

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CFS TENSION ROD SYSTEM PROTAHPROTAH is an innovative system of rods and accessories for use in steel construction.

PROTAH rods are mostly used as a bearing element. The system can be used for the construction of elegant bridges and pedestrian bridges, for different types of roof structures, observation towers, sports stadiums and similar buildings.

They are often used in the interior, mostly in buildings such as airports, showrooms, shopping centres and various representational spaces where high aesthetic and architectural impact are required.

PROTAH system is popular for its simplicity, modern design, impressive appearance and also for easy installation.

System PROTAH allows rectification without using tension locks.

Standard Tension Rod System PROTAH

The system offers 14 diameters of rods from 12 to 100 mm. The standard system consists of a rod, two forks, two nuts, two pins and four circlips.

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TENSION ROD BARS FORKS

The fork is used to connect the rod to a plate using a pin and for rectification of the rod’s length. The fork is cast from steel CSN 422712 (DIN: GS-20Mn5). The right-hand, resp. left-hand thread is mechanically machined. Forks with a left-hand thread are marked by imprinted letter “L” on the forehead.

Tension Rod is produced from steel round bars S355NL and S460NL. There is left-hand metric thread on the one side and right-hand thread on other side.

There are milled flats on the rod for a spanner to allow rectifying of the system. Threads up to 30mm diameter are cut. Threads from 36mm diameter are rolled to obtain better fatigue resistance.

Bar Dimension

P12 P16 P20 P24 P30 P36 P42 P48 P56 P64 P75 P85 P90 P100

ØT [mm]

12 ±

0,5

16 ±

0,5

20 ±

0,5

24 ±

0,5

30 ±

1,0

36 ±

1,0

42 ±

1,0

48 ±

1,0

56 ±

1,0

64 ±

1,0

75 ±

1,0

85 ±

1,0

90 ±

1,0

100

± 1

,0

Thread [mm]

M12

x 1

,75

M16

x 2

,00

M20

x 2

,50

M24

x 3

,00

M30

x 3

,50

M36

x 4

,00

M42

x 4

,50

M48

x 5

,00

M56

x 5

,50

M64

x 6

,00

M75

x 6

,00

M85

x 6

,00

M90

x 6

,00

M10

0 x

6,00

Z [mm] 52 58 70 82 95 116 125 153 169 224 263 310 330 360

V [mm] 150 150 250 250 250 400 400 400 500 500 - - - -

ST [mm] 10 14 18 21 27 32 36 42 50 58 - - - -

PT [mm] 30 30 30 30 30 30 30 30 30 30 - - - -

mT [mm] 0,9 1,6 2,5 3,6 5,6 8,0 10,9 14,2 19,3 26,0 35 45 50 62

Fork Dimension

P12 P16 P20 P24 P30 P36 P42 P48 P56 P64 P75 P85 P90 P100

LV [mm] 75 94 115 139 166 199 231 271 315 388 463 507 567 630

BV [mm] 24 32 40 47 55 68 79 90 107 131 158 172 198 220

HV [mm] 31 42 62 62 76 90 105 119 137 176 206 223 250 280

DV [mm] 12 15.4 19.5 23.5 29.5 33.5 40 47 53 65 77 87 92 102

T [mm] 11 17 19 21 26 32 36 42 55 60 75 80 86 91

F [mm] 18.5 25 30 36 44 51 60 70 83 107 125 134 147 162

G [mm] 22.7 31 38 41 50 60 70 82 102 122 155 164 177 198

mV [kg/ks] 0,2 0,4 0,9 1,4 2,4 4,7 6,8 10,5 16,6 31,6 51 68 105 148

Left-hand thread is marked on the rod by imprinted letter “L” on the area for the spanner. The load capacities for steel S355NL and S460NL, min. and max. available rod length – please see Table

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LOCKING NUTS COMPONENTS OF THE SYSTEM PROTAH

PINS

Locking nut ensures that the rod and the fork (resp. rod and coupler) are in the desired position while protecting the thread of the rod. Locking nuts are machined from steel 42CrMo4+QT (ČSN EN 10 083). Locking nuts as well as the forks are produced with right or left-hand thread. Locking nuts with left-hand thread are marked by imprinted letter “L” on the forehead.

The system PROTAH, in addition to the standard features also, offers additional features for better flexibility of the system.

Coupler without Lug

A coupler allows standard system lengths to be extended as well as the range of rectification of the rod. Couplers are machined from steel 42CrMo4+QT (ČSN EN 10 083). The coupler is made with right-hand thread from one side and left-hand thread from other side. Side with left-hand thread is marked by imprinted letter “L” on the forehead. Each coupler has two locking nuts to secure the rod and the coupler in the desired position.

The pins connect the fork to the plate, and are machined from steel 42CrMo4+QT (ČSN EN 10 083). The circlips are used to ensure the pin is in the fork.

Locking Nut Dimension

P12 P16 P20 P24 P30 P36 P42 P48 P56 P64 P75 P85 P90 P100

LM [mm] 40 42 50 58 65 80 83 105 113 160 188 225 240 260

ØM [mm] 22 26 35 40 50 64 70 85 95 115 135 160 180 200

SM [mm] 19 24 30 36 46 55 65 75 85 95 - - - -

PM [mm] 12 12 15 15 20 20 30 30 30 30 - - - -

mM [kg/ks] 0,1 0,1 0,2 0,3 0,6 1,3 1,5 3,0 3,8 7,6 13,3 24,2 34,1 43,4

Pin Dimension

P12 P16 P20 P24 P30 P36 P42 P48 P56 P64 P75 P85 P90 P100

ØS [mm] 25 30 40 45 55 70 75 90 100 135 155 179 189 209

Ls [mm] 60 70 90 110 130 150 180 200 230 280 340 380 450 510

Ss [mm] 19 24 30 36 46 55 65 75 85 110 - - - -

Ps [mm] 12 12 15 15 20 20 30 30 30 30 - - - -

ms [kg/ks] 0,1 0,2 0,6 0,8 1,6 3,1 3,8 6,4 9,0 22 35 53 71 95

Pin Dimension

P12 P16 P20 P24 P30 P36 P42 P48 P56 P64 P75 P85 P90 P100

L [mm] 37 46 54 63 75 85 98 110 132 153 181 199 226 248

d [mm] 11 14 18 22 28 32 38 45 50 62 75 85 90 100

m [kg/ks] 0,1 0,1 0,2 0,3 0,6 1,3 1,5 3,0 3,8 7,6 13,3 24,2 34,1 43,4

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LOAD CAPACITY OF THE TENSION ROD SYSTEM

ANCHOR DISC FOR CROSS BRACING

DESIGN OF THE TENSION ROD

The anchor disc allows crossing of the rods and can be an interesting aesthetic element.

In standard sizes the anchor discs are manufactured from steel S355 or S460. The number of holes and the angle between the connected rods is given by the customer’s requirements. Bespoke discs can be produced if required.

The design loads have been calculated according to the standard EN 1993-1-1 and verified using static and dynamic load tests. The whole system is calculated so that the weakest point of the system is particular in the rod, which then determines the load capacity of a whole system.

Load bearing capacity according to ČSN EN 1993-1-1

Calculation of the cross section area: A=πd2/4

Calculation of the weakened cross section area : As=(ds+dk)2.π/16

Load capacity of the rod: NR,d1 =A.fy/γM0; γM0=1,00

Load capacity of the weakened rod cross section : NR,d2 =0,9.As. fu/γMb; γMb=1,2

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Design Load of the Tension Rods PROTAH

Rod Type P12 P16 P20 P24 P30 P36 P42 P48 P56 P64 P75 P85 P90 P100

ØT [mm] 12 16 20 24 30 36 42 48 56 64 75 85 90 100

NRd,S355 [kN] 31,0 57,7 86,4 124,5 197,9 288,2 379,3 542,7 687,0 905,6 1244 1681 1892 2369

NRd,S460 [kN] 36,4 70,7 110,3 158,9 252,5 367,6 504,5 721,6 913,5 1204 1654 2235 2516 3142

Fork-Fork (with one bar)

Lmin [mm] 410 430 650 670 690 1020 1050 1090 1330 1400 1440 1480 1530 1590

Lmax [mm] 6070 6090 6110 6135 6150 8185 8215 8255 8295 8360 8435 8475 8530 8585

Fork-Coupler (with one bar)

Lmin [mm] 380 390 610 620 630 950 970 990 1210 1260 1270 1300 1340 1380

Lmax [mm] 6045 6055 6070 6085 6095 8115 8135 8155 8175 8220 8265 8290 8335 8370

Coupler - Coupler (with one bar)

Lmin [mm] 350 360 560 570 570 880 890 890 1100 1120 1100 1110 1140 1160

Lmax [mm] 6020 6020 6030 6035 6040 8040 8050 8055 8060 8080 8100 8110 8140 8160

Rectification*

± r* [mm] 8 8 10 12 15 18 21 24 28 35 45 50 65 75

*This rectification is given for the systém Fork-Fork. When using a coupler than the rectification is doubled.

Fork - Fork

Fork - Coupler

Coupler - Coupler

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CONNECTING PLATES - DIMENSIONS

The dimensions specified in the table below must be complied with. Plates are not included in the scope of delivery. Material for the connecting plates: steel S355.

Forks must be correctly aligned and positioned in the same plane to ensure that the tension system is not subject to bending

To ensure the rod can be installed, one fork end of the rod must be able to swing into place. The maximum deviation of the opposing connecting plates from the vertical is 0.5°.