154. EXTERNAL PRESTRESSING: K-SYSTEM No.2

PAGE 1/3

PPC

154/

1-

02.95

Ø 1

Ø 2

Type 1

Type 2

q = 25 Ø + S

overall

q

1

= 16 Ø + S

overall

Ø/2 6Ø 6Ø

6Ø 6Ø

S

Ø/2

q = 25 Ø + S

Ø/2

q

1

= 16 Ø + S

7.5Ø

7.5Ø

S

Ø/2

K-System: A’ Anchorage (Tromplate) with unbonded strand

B

E

Ø 5
n =

Ø 3

E

A

Ø 6

D

1

Ø 4

Ø 3

a

H

1

pitch

Ø

Ø

F

b/4

b/2 one layer

3b/8 two layers

C

Ø 5
n =

154. EXTERNAL PRESTRESSING: K-SYSTEM No.2

PAGE 2/3

K-System No.2

A’ A

NCHORAGE

(T

ROMPLATE

) / A A

NCHORAGE

(P

LATE

+ T

RUMPET

)

WITH UNBONDED STRAND

NOTE

(1) High density polyethylene (HDPE), ref. Afnor NF PF 114 Group 4, Nominal pressure 4 bar.

(2) The theoretical quantities must be increased by 10 to 40% depending on the number of grouting phases.

(3) The helical or cross-wise bursting reinforcing bars given in the table, which oppose the bursting force in the concrete of the anchorage zone, are only valid for an isolated anchorage

in a prismatic section piece (test block), for concrete strength f

cmin

between 23 and 43 MPa (cylinder strength).

– When the anchorages are grouped into one of several lines, continuous reinforcement with an equivalent cross-sectional area must be provided to link all the anchorages, appropriately

anchored within the structure.

(4) All the jacks given in the table correspond to optimal use.

Dimensions

in mm

A’–4 K 15

A’–7 K 15

A’–12 K 15

A’–19 K 15

A’–27 K 15

A’–37 K 15

A x B

170 x 170

245 x 220

290 x 275

315 x 315

450 x 410

525 x 470

C

120

175

185

380

410

460

b

1

75

100

D

1

120

140

162

218

252

320

H

1

50

55

63

65

78

95

(1) Ø

1 ext.

x e

75 x 3

90 x 3

110 x 3.40

125 x 3.90

140 x 4.30

160 x 4.90

Ø

2 ext.

x e x l

76.10 x 2 x 80

95.10 x 2.75 x 120 114.30 x 2.75 x 135

133 x 3 x 155

152.40 x 4.50 x 155 168.30 x 3.20 x 170

(2) Cement (kg/m)

4.05

5.70

7.95

9.00

10.05

12.45

Grout (l/m)

2.70

3.80

5.30

6.00

6.70

8.30

Ø

3

G 3/4”

G 3/4”

G 3/4”

G 1”

G 1” 1/2

G 1” 1/2

E

220

270

300

370

590

620

F

110

120

125

125

145

160

a (°)

10

10

10

10

30

30

Ø

4

190

254

300

352

440

440

Ø

5

12

12

12

16

20

20

n =

2

4

4

4

4

4

(3) Spiral Ø

10

12

14

16

18

20

Steel grade FeE 235

Number of turns

6

6

6

6

7

8

Ø

6 ext.

200

280

360

440

540

640

Pitch

50

50

60

65

70

70

Total length

300

300

360

390

490

560

(3) Type of cross-wise

1 or 2

1 or 2

1 or 2

1 or 2

1 or 2

1 or 2

bursting reinforcement

Number of layers

1

1

1

1

2

2

Ø of grade FeE 235 reinf. bars

10

12

14

16

14

16

b

160

200

240

300

360

400

s

100

120

150

170

210

240

q

1

350

420

500

570

560

640

q

2

260

312

374

426

434

496

(4) Jack

K 100+

K 200+

K 350+

K 500+

K 700+

K 1000+

or

or

or

or

Multistrand

K 100 BH

⊗

K 200 BH

⊗

K 350 BH

⊗

K 500 F

⊗

Monostrand

M 23 180 BH

⊗

M 23 180 BH

⊗

M 23 180 BH

⊗

M 23 180 BH

⊗

M 23 180 BH

⊗

M 23 180 BH

⊗

Pull-in (mm)

K 13

+ = 6 to 9

+ = 6 to 9

+ = 6 to 9

+ = 6 to 9

+ = 6 to 9

+ = 6 to 9

⊗

= 4 to 6

⊗

= 4 to 6

⊗

= 4 to 6

⊗

= 4 to 6

⊗

= 4 to 6

K 15

+ = 6 to 11

+ = 6 to 11

+ = 6 to 11

+ = 6 to 11

+ = 6 to 11

+ = 6 to 11

⊗

= 4 to 8

⊗

= 4 to 8

⊗

= 4 to 8

⊗

= 4 to 8

⊗

= 4 to 8

⊗

= 4 to 8

ANCHORAGE

DUCT -

GROUTING

CACHETAGE -

FIXING

HELICAL BURSTING

REINFORCEMENT

CROSS-WISE BURSTING

REINFORCEMENT

TENSIONING

154. EXTERNAL PRESTRESSING: K-SYSTEM No.2

PAGE 3/3

Type 1

Type 2

q = 25 Ø + S

overall

q

1

= 16 Ø + S

overall

Ø/2 6Ø 6Ø

6Ø

6Ø

S

q = 25 Ø + S

Ø/2

q

1

= 16 Ø + S

7.5Ø

7.5Ø

S

Ø/2

B

E

Ø 5
n =

Ø 1

E

A

Ø/2

K-System: A Anchorage (Plate + Trumpet) with unbonded strand

Ø 6

D

1

Ø 4

a

Ø

pitch

Ø 1

Ø 2

Ø 3

G

H

1

F

C

b/4

b/2 one layer

3b/8 two layers

Ø 5

n =