FRP net material for peeling prevention
HARD MESH
New Technology Information System (NETIS) Registration Number：KT-190006-A
Outline
Thin and high rigid net fits on the frame surface and can prevent concrete peeling.
HARD MESH is a grid material integrated FRP structure and glass mesh for preventing small concrete piece peeling in a tunnel. By fixing it to the surface of the tunnel lining, small concrete pieces are prevented from peeling off.
Characteristics
- It has outstanding stiffness even thin because FRP structure is made of carbon fiber grid.
- Integrated glass mesh prevents small concrete piece peeling.
- Since specialized washer and expansion anchor are used for fixing HARD MESH, it is possible to check the frame near the anchor after installation.
HM Specialized washer
Fixing method
- Make sure to use specialized washers and expansion anchors to fix HARD MESH.
- The standard fixed pitch of HARD MESH is 500mm.
- Install the joints by overlapping one square.
【Precautions】
- Be sure to strictly observe the hole diameter of the expansion anchor. It affects anchor strength. Note the case of shallow hole is the same.
- Tighten the nut with the recommended torque value.
- Wear gloves in handling because the end of the grid and special washer are sharp.
Standard / specification
Standard
HARD MESH
| Product No | Cross-section area (mm2) |
Tensile strength (N/mm2) |
Tensile elasticity (kN/mm2) |
Tensile stress (kN/anchor) |
Tensile stiffness (kN/anchor) |
Pitch (mm) |
|---|---|---|---|---|---|---|
| HM-C11 | 11.1 | 1,200 | 95 | 13.3 | 1,054 | 50×50 |
Expansion anchor
| Product No | Dimensions (mm) |
Material | Hole diameter | Hole depth | Recommended torque value | Remarks |
|---|---|---|---|---|---|---|
| MS-670LN | M6×70 （overall length） |
SUS304 | 6.4mm | 65mm or more |
8 to 10N*ｍ | With lock nut |
HM dedicated washer
| Part number | dimensions (mm) |
Material | Remarks |
|---|---|---|---|
| HM-W75*1.5 | 75×75×1.5t | SUS304 | with opening |
- * For expansion anchors, consult us if the length have to be changed due to the depth of hole.
- * Packing … Expansion anchor: 100 pcs. / box, HM washer : 100 pcs. / box
Performance
| Measures against peeling Performance | Fire spread and selfextinguishing properties | Generated gas safety | |||||
|---|---|---|---|---|---|---|---|
| Pull-out performance (Net-type / Saddle-type Construction Method) | Result | Fire spread range | Specimen left-right direction | 230mm | Mouse action stop time： 14.6minutes |
||
| Load displacement | At load 0.5 kN | 44.6mm | Top direction of specimen | 185mm | |||
| Fire spread time | Burning time | 10minutes | |||||
| Fire spread time | 0second | ||||||
- *According to the NEXCO test method (Pullout performance test method 737-2011, Fire spreadability / Self-extinguishing test 738-2011).
- *A test method that confirms that “no fumes or gases harmful to evacuation are generated” in the Building Standard Law for the safety of generated gas.
