![Back to homepage [PREFA KOMPOZITY,a.s. logo]](https://www.prefa-kompozity.cz/en/wp-content/themes/prefakompozityen/images/prefa-kompozity-logo-new.png){kind=logo}
References
More examples of applications can be found in the references: water management, transport construction, chemistry and more
Details
GRATINGS TYPES
- PREFAPOR assembled gratings composed of pultruded beams; contain up to 70% glass fiber.
- PREFAGRID molded gratings; contain up to 40% glass fiber.
ACCESSORIES
Stainless steel gratings anchors, shaped to match anchor eye (moulded gratings) or support leg (assembled gratings) thickness.
COLORS
The standard color is grey; for larger orders, consult our sales department for custom colors (green, yellow, and others).
PREFAPOR ASSEMBLED GRATINGS
KEY FEATURES
- Pultrusion technology allows the use of subsurface veil, which protect the material
from corrosive environments. - Up to 70% glass fiber; allows the use of fiber mats
- Longer service life
- Higher shock resistance
- Panels of arbitrary length can be made (unlike moulding, which is limited by mold size)
- Anti-slip surface
DRAWBACKS
- Can only be supported perpendicular to loadbearing element axis
- Not suitable for pipe pass-through apertures
ASSEMBLED GRATINGS TYPES
| type | plate width [mm] |
gap width [mm] |
height [mm] |
weight [kg/m2] |
|---|---|---|---|---|
| 1. PREFAPOR 15×23/25 | 15 | 23 | 25 | 12.0 |
| 2. PREFAPOR 40×10/25 | 40 | 10 | 25 | 13.0 |
| 3. PREFAPOR 15×23/32 | 15 | 23 | 32 | 13.5 |
| 4. PREFAPOR 15×23/38 | 15 | 23 | 38 | 16.1 |
| 5. PREFAPOR 25×25/50 | 25 | 25 | 50 | 15.1 |
NOTE: Custom sizes available (length in load-bearing direction up to 4,000 mm; width up to 1,500 mm)
| 1. | 2. | 3. + 4. | 5. |
|---|---|---|---|
 |
 |
 |
 |
ASSEMBLED GRATINGS ANCHORING
| Grate attachment PREFAPOR 15×23/32, 15×23/38 – type 727 | Flat attachment 44×25/3 PREFAPOR grid 40×10/25 – type 728 | PREFAPOR grid attachment with fixing tab |
|---|---|---|
 |
 |
 |
PREFAGRID MOULDED GRATINGS
KEY FEATURES
- Higher stiff ness (reinforcing fibers laid in two perpendicular axes)
- Can be supported at all four sides
- Can be cut to any shape
- Pipe pass-through apertures can be cut
- Anti-slip surface
DRAWBACKS
- Moulding technology is incompatible with subsurface veil
- Reinforcing fiber share is only about half that of assembled gratings
- Lower shock resistance
- Maximum dimensions limited by available molds
MOULDED GRATINGS TYPES
| type | eye size [mm] |
height [mm] |
weight [kg/m2] |
standard panel sizes [mm] |
|---|---|---|---|---|
| 1. PREFAGRID 30×30/13 | 30 x 30 | 13 | 6.1 | 1,220 x 3,660 |
| 2. PREFAGRID 30×30/25 | 30 x 30 | 25 | 12.0 | 1,000 x 3,000 |
| 3. PREFAGRID 30×30/30 | 30 x 30 | 30 | 14.6 | 920 x 2,800; 920 x 3,050; 1,000 x 2,100; 1,000 x 3,000; 1,000 x 3,660; 1,000 x 4,000; 1,220 x 2,100; 1,220 x 3,660 |
| 4. PREFAGRID 12×12/30 | 12 x 12 | 30 | 18.0 | 1,247 x 4,047 |
| 5. PREFAGRID 30×30/38 | 30 x 30 | 38 | 19.5 | 1,000 x 3,660; 1,000 x 4,000; 1,220 x 2,100; 1,220 x 3,660; 1,220 x 4,000 |
| 6. PREFAGRID 12×12/38 | 12 x 12 | 38 | 23.5 | 1,000 x 4,000; 1,220 x 3,660 |
| 7. PREFAGRID 44×44/50 | 44 x 44 | 50 | 23.5 | 716 x 3,207; 970 x 2,250; 970 x 3,660; 1,220 x 3,660 |
| 8. PREFAGRID 30×30/60 | 30 x 30 | 60 | 50.0 | 695 x 3,207; 770 x 1,383; 1,000 x 3,660; 1,220 x 3,660 |
NOTE: Custom shapes and sizes available upon request
| 1. | 2. + 3. | 4. + 6. | 5. | 7. | 8. |
|---|---|---|---|---|---|
 |
 |
 |
 |
 |
 |
MOULDED GRATINGS ANCHORING
| PREFAGRID grating bracket h. 25, 30, 38, 60mm – type 732, h. 50mm – type 735 | PREFAGRID grid attachment with fixing tab | PREFAGRID grating connection bracket h. 30mm – type C-7030, h. 38mm – type C-7038 |
|---|---|---|
 |
 |
 |
GRATING MOUNTING OPTIONS
 profile frame for installation in concrete |
 Angle frame for installation in concrete, steel anchors |
 Angle frame for side mounting, mechanical anchors |
 2 x angle frame for side mounting, mechanical anchors |
 Angle frame for top mounting, dowels |
 Angle frame for top mounting with extra cement, dowels |
 Placing on composite beam |
PREFAPOR ASSEMBLED GRATING MAXIMUM LOAD
CONTINUOUS LOAD [kg/m2]
| type | SPAN BETWEEN SUPPORTS [mm] | |||||||
|---|---|---|---|---|---|---|---|---|
| 500 | 600 | 700 | 800 | 900 | 1,000 | 1,100 | 1,200 | |
| PREFAPOR 15×23/25 | 5,820 | 3,370 | 2,120 | 1,330 | 830 | 550 | 370 | 260 |
| PREFAPOR 40×10/25 | 10,460 | 6,050 | 3,810 | 2,390 | 1,490 | 980 | 670 | 470 |
| PREFAPOR 15×23/32 | 11,640 | 6,730 | 4,240 | 2,660 | 1,660 | 1,090 | 750 | 530 |
| PREFAPOR 15×23/38 | 13,240 | 9,010 | 5,670 | 3,560 | 2,230 | 1,460 | 1,000 | 700 |
| PREFAPOR 25×25/50 | 16,340 | 11,820 | 8,430 | 6,230 | 3,890 | 2,550 | 1,740 | 1,230 |
NOTE: For two-support mounting. Criterion: sagging l/125, max. 6 mm.
ISOLATED FORCE LOAD [kg]
| type | SPAN BETWEEN SUPPORTS [mm] | |||||||
|---|---|---|---|---|---|---|---|---|
| 500 | 600 | 700 | 800 | 900 | 1,000 | 1,100 | 1,200 | |
| PREFAPOR 15×23/25 | 920 | 500 | 320 | 240 | 190 | 150 | 110 | 90 |
| PREFAPOR 40×10/25 | 910 | 590 | 410 | 270 | 190 | 170 | 130 | 100 |
| PREFAPOR 15×23/32 | 1,150 | 670 | 450 | 320 | 240 | 190 | 140 | 110 |
| PREFAPOR 15×23/38 | 1,940 | 1,180 | 790 | 570 | 420 | 330 | 250 | 200 |
| PREFAPOR 25×25/50 | 2,360 | 1,620 | 1,060 | 800 | 620 | 480 | 380 | 310 |
NOTE: Values for two-support mounting with load applied at grating geometric center, pursuant to EN 124. For load applied to unsupported edge, the deformation is about twice the value listed.
Criterion: sagging l/125, max. 6 mm.
PREFAGRID MOULDED GRATINGS MAXIMUM LOAD
CONTINUOUS LOAD [kg/m2]
| type | SPAN BETWEEN SUPPORTS [mm] | |||||||
|---|---|---|---|---|---|---|---|---|
| 500 | 600 | 700 | 800 | 900 | 1,000 | 1,100 | 1,200 | |
| PREFAGRID 30×30/25 | 1,450 | 840 | 530 | 330 | 210 | 140 | 90 | 70 |
| PREFAGRID 30×30/30 PREFAGRID 12×12/30 |
2,780 | 1,610 | 1,010 | 640 | 400 | 260 | 180 | 130 |
| PREFAGRID 30×30/38 PREFAGRID 12×12/38 |
4,270 | 2,470 | 1,550 | 980 | 610 | 400 | 270 | 190 |
| PREFAGRID 44×44/50 | 7,660 | 5,220 | 3,290 | 2,060 | 1,290 | 850 | 580 | 410 |
| PREFAGRID 30×30/60 | 20,180 | 14,180 | 10,510 | 6,600 | 4,120 | 2,700 | 1,850 | 1,300 |
NOTE: For two-support mounting. Criterion: sagging l/125, max. 6 mm.
ISOLATED FORCE LOAD [kg]
| type | SPAN BETWEEN SUPPORTS [mm] | |||||||
|---|---|---|---|---|---|---|---|---|
| 500 | 600 | 700 | 800 | 900 | 1,000 | 1,100 | 1,200 | |
| PREFAGRID 30×30/25 | 350 | 210 | 150 | 100 | 70 | 60 | 50 | 40 |
| PREFAGRID 30×30/30 PREFAGRID 12×12/30 |
760 | 450 | 270 | 190 | 140 | 110 | 80 | 60 |
| PREFAGRID 30×30/38 PREFAGRID 12×12/38 |
1,030 | 670 | 420 | 290 | 210 | 160 | 120 | 100 |
| PREFAGRID 44×44/50 | 2,270 | 1,370 | 940 | 650 | 490 | 340 | 280 | 220 |
| PREFAGRID 30×30/60 | 4,880 | 3,300 | 2,060 | 1,440 | 1,130 | 790 | 640 | 510 |
NOTE: Values for two-support mounting with load applied at grating geometric center, pursuant to EN 124. For load applied to unsupported edge, the deformation is about twice the value listed.
Criterion: sagging l/125, max. 6 mm.
