FASTENING SIGN BLANKS ON MULTIPLE-SIGN-SUPPORT SYSTEMS

The sign blank and its mounting hardware become a structural component of the sign assembly upon impact. Slip base and frangible coupler designs of multiple-sign-support systems require the sign panel hardware, and the upright signposts, to provide the

TABLE 7.15 Bolt-Tightening Specifications for Slip Base Design

a.

Specifications

in U. S. Customary units

Post size,

Bolt

Clamping

Torque,

in X lb/ft

size, in

force, lb

ftlb

S3 X 5.7

K

920-1380

7-11

S4 X 7.7

К

920-1380

7-11

W6 X 8.5

5-8

1740-2660

17-19

W6 X 12

5-8

1740-2660

17-19

W6 X 15.5

5-8

1740-2660

17-19

W8 X 17

5-8

1740-2660

17-19

W8 X 20

5-8

2400-3600

17-19

W10 X 21

5-8

2400-3600

31-46

W10 X 25

5-8 or 5-8

2400-3600

31-46

W12 X 27

3-4 or 7-8

2400-3600

31-46

>30 lb/ft

1

2400-3600

44-55

b. Specifications in SI units

Post size,

Bolt

Clamping

Torque,

mm X kg/m

size, mm

force, N

N-m

S76 X 8

14

4092-6139

10-15

S100 X 11

14

4092-6139

10-15

W150 X 13

16

7740-11,832

23-25

W150 X 18

16

7740-11,832

23-25

W150 X 23

16

7740-11,832

23-25

W200 X 25

16

7740-11,832

23-25

W200 X 30

16

10,676-16,014

23-25

W254 X 31

20 or 22

10,676-16,014

42-62

W254 X 37

20 or 22

10,676-16,014

42-62

W305 X 40

20 or 22

10,676-16,014

42-62

> 45 kg/m

27

10,676-16,014

60-75

FIGURE 7.51 Design of friction plate. (See Table 7.16 for dimensions.)

TABLE 7.16 Specification of Friction Plate Design

a. Specification in U. S. Customary units; dimensions in in; see Fig. 7.51

Post size, in X lb/ft

Bolt

diameter

Bolt

length

F

G

H

J

K

L

N

d

t

S3 X 5.7

112

312

112

112

252

134

52

12

946

14

S4 X 7.7

12

112

312

112

112

252

134

52

12

526

12

W6 X 8.5

12

112

352

2

112

4

214

72

12

526

12

W6 X 12

12

112

352

2

112

4

214

72

12

’/6

12

W6 X 15.5

52

112

452

212

114

6

312

114

52

1X6

34

W8 X 17

52

112

452

212

114

514

234

114

52

1X6

34

W8 X 20

34

132

434

212

112

514

234

114

34

13-16

12

W10 X 21

34

1

514

3

112

534

234

112

34

13-16

12

W10 X 25

34

152

514

3

112

534

234

112

34

13-16

12

W12 X 27

34

152

514

3

112

612

312

112

34

13-16

12

b. Specification in

SI units; dimensions

in mm;

see Fig. 7.51

Post size,

Bolt

Bolt

mm X kg/m

diameter

length

F

G

H

J

K

L

N

d

t

S76 X 8

13

38

80

38

29

67

35

16

13

15

6

S100 X 11

13

38

80

38

29

67

35

16

13

15

6

W150 X 13

13

38

92

51

29

102

57

23

13

15

6

W150 X 18

13

38

92

51

29

120

57

23

13

15

6

W150 X 23

16

38

112

64

32

152

89

32

16

18

10

W200 X 25

16

38

112

64

32

134

70

32

16

18

10

W200 X 30

19

45

121

54

38

134

70

32

19

21

13

W254 X 31

19

45

134

76

38

146

70

38

19

21

13

W254 X 37

19

48

134

76

38

146

70

38

19

21

13

W305 X 40

19

48

134

76

38

165

89

38

19

21

13

FIGURE 7.52 Design of hinge plate. (See Table 7.17 for dimensions.)

TABLE 7.17 Specification of Hinge Plate Design

a.

Specification

in U. S. Customary units; dimensions

in in; see Fig. 7.52

Post size,

Bolt

Bolt

in X lb/ft

diameter

length

S

U

V

X

Y

Z

d

t

S3 X 5.7

158

334

258

158

152

138

58

586

956

S4 X 7.7

12

158

334

258

158

152

138

58

586

956

W6 X 8.5

12

152

454

4

158

2

254

78

58

956

W6 X 12

12

152

454

4

158

2

254

78

55б

956

W6 X 15.5

58

152

5

6

158

252

352

158

55б

W8 X 17

58

112

5

558

158

252

234

158

55б

W8 X 20

38

138

552

558

152

252

234

158

32

%

W10 X 21

38

138

6

538

152

3

234

152

32

%

W10 X 25

38

138

6

538

152

3

234

152

756

13

/16

W12 X 27

38

178

6

652

152

3

352

152

726

13

/16

b. Specification in

SI units; dimensions

in mm;

see

Fig. 7.52

Post size,

Bolt

Bolt

mm X kg/m

diameter

length

S

U

V

X

Y

Z

d

t

S76 X 8

13

38

95

67

29

38

35

16

15

8

S100 X 11

13

38

95

67

29

38

35

16

15

8

W150 X 13

13

38

108

102

29

51

57

23

15

6

W150 X 18

13

38

108

102

29

51

57

23

15

8

W150 X 23

16

38

127

152

32

64

89

32

18

8

W200 X 25

16

38

127

133

32

64

70

32

18

8

W200 X 30

19

45

140

133

38

64

70

32

21

10

W254 X 31

19

45

152

146

38

76

70

38

21

10

W254 X 37

19

48

152

146

38

76

70

38

21

11

W305 X 40

19

48

152

165

38

76

89

38

21

11

rigidity necessary for proper operation. This includes providing sufficient resistance to activate the hinge and to prevent intrusion of the sign and impacted support into the passenger compartment. Proper hinge activation also requires that no portion of the pri­mary sign, or any supplemental signs, be attached to the support posts below the hinge. In addition, no portion of the sign panel should extend lower than 7 ft (2100 mm) above ground level.

Fastening of sign panels to multisupport sign systems usually requires the use of stiffeners to provide the required rigidity. The exception to this is for relatively small surface area signs, which require multiple supports because of their shape, and for wooden signs. Consult state specifications for installation requirements. Clamps are used to fasten the stiffeners to S — or W-shaped beam posts, eliminating the need to drill into the post itself. Fastening details using aluminum Z-bar as the stiffener were presented in Fig. 7.43, with other common methods presented in Figs. 7.44 and 7.45. U-channel posts can also be used as stiffeners for large signs. When U-channel is used, it should be galvanized and should weigh no more than 2.5 lb/ft (3.7 kg/m). U-channel of 2.0 lb/ft (3 kg/m) is sufficiently strong to withstand wind loads of 70 mi/h (130 km/h).

Figure 7.53 presents the configuration of stiffeners for various sign sizes on a dual multiple-support system. Signs with a height of 24 in (600 mm) or more should be reinforced with two stiffeners placed a distance of one-fourth the sign height from the top and bottom of the sign. The stiffeners should not extend closer than 2 in (25 mm) to the sign edge. Supplementary signs, added to the bottom of the primary sign, should

FIGURE 7.53 Example showing placement of sign stiffeners. Dimensions shown as mm. Conversions: 25 mm = 1 in, 50 mm = 2 in, 64 mm = 2.5 in, 76 mm = 3 in, 155 mm = 628 in, 305 mm = 12.І/2 in, 190 mm = 7% in, 380 mm = 1594 in, 610 mm = 2442 in, 1220 mm = 48 in, 1850 mm = 72 in.

be attached to the sign stiffeners and not to the posts. Signs should never be allowed to extend above and below the hinge at the post. Extending the sign at the hinge can cause the hinge to bind and improper operation upon impact.

Updated: 22 ноября, 2015 — 3:46 дп