Road Mesh, Mesh Track for Road Construction
Road mesh also be named mesh track - a grid of steel wire with a double twisting galvanized reinforced by a reinforcing rod. The grid is made of steel wire and double torsion with a mesh size 60 × 80 mm, 80 × 100 mm, 100 × 120 mm, 120 × 150 mm. The woven mesh wire diameter: 2.0 mm - 4.0 mm, and the reinforcement wire diameter: 4.0 mm - 5.0 mm (Fig. 2).
The transverse rod is woven into the net every 16cm road mesh comes in rolls 50 m, a width of 3 or 4m (Fig. 1).
Fig. 1 Road mesh in roll
Fig. 2 Road mesh grid
Wire of road mesh
- Load: wire used in the production road mesh shall withstand within the 350-500 N/mm2.
- Elongation: elongation is not less than 12%.
- Adhesion of zinc: zinc coating adhesion must be such that at 6 turns on Winding base with a diameter equal to four times the diameter wire coating does not peel off to such a extent that it can be removed manually.
Fig. 3 Road mesh used in road construction
Fig. 4 Road mesh used in road construction
Road mesh is used in major repairs of the pavement and the reconstruction of highway (Fig. 3). Road mesh used in new road construction increases the bearing capacity of pavement, especially on soft ground and prevents rutting and cracking. Depth of the grid road mesh may vary depending on the requirements for the quality of road surface, road geometric characteristics of the layers. However, in any case, it is recommended to lay a grid road mesh between asphalt and bituminous layers.
Using the grid road mesh to repair the upper layers of the existing road can increase the road performance and reducing pavement deformation. Road mesh can also extend the service life of pavement.
Road mesh installation steps:
Preparation of the base for the subsequent geo grid installation road mesh by using traditional road engineering (milling). Milling is carried out to required thickness, depending on the goals of the builders: a complete replacement of pavement, repair or top layer of asphalt concrete pavement. In the event that the repair of the roadway is necessary removal of existing grid road mesh coverage, you must configure the routing depth to the depth of the grid. At the same time at the design stage to provide the proper thickness of asphalt layer, which will in future carry out the operation of milling - not less than 80 mm.
Next, you need to expose the edge of the grid over the entire length in the transverse direction, the valve insert 20 mm in the edge of the grid and draw a grid of the remaining asphalt layer. If necessary, re-use grid, to purge it from the old coating. The prepared surface should be level, free of dust and crumbs, cracks and voids filled with bitumen emulsion.
- Rolling nets
Road mesh grid is supplied in rolls of 25 or 50m and a width of 2, 3 or 4m depending on the width of the roll, you must select the appropriate length of the bar, and, fixing on her roll of the grid, the grid roll on the prepared surface of the outer side up with front-end loader or other mechanism to carry out this operation.
When rolling the material Road mesh necessary to provide that the convex side of the grid roll was directed upward, away from the prepared foundation.
It must be remembered that the mesh is placed between road mesh asphalt layers in the case of the traditional design of the pavement or on top of concrete slabs in case of necessity overlap of their joints. Cover over the net road mesh to take place in 2 layers with a total thickness not less than 10 cm in the extreme case: in a layer thickness of not less than 8 cm for laying asphalt mix asphalt is recommended for pneumatic speed.
When pairing two or more rolls of the grid, it is necessary to comply with overlapping coils in the longitudinal and transverse direction, 15 and 30 cm respectively. In places the conjugation of three or more sections of the grid is necessary to cut the panel so as to overlap at the site was no more than two panels.
When placing the mesh on the curved sections of road to be cut the appropriate piece of mesh on the inside curve of the rotation and the method of superposition to form a curved portion.
To work efficiently, the grid should be laid flat, without folds. Skating rink on the Pneumatic may be unfolding on the grid, to avoid the formation of stresses and to reduce the natural curvature of the roll.
- Leveling Nets
After completion of the rolling grid needs to be smoothed out by rolling on pneumatic-go. Full cycle of leveling the grid consists of four passes on one track roller across the width of the roll. A minimum of 3 axes of the grid (in the center and edges). If necessary, you can make extra passes.
If you have problems with leveling grid is recommended to cut the wire edge every 3 - 4m (this simplifies the process of leveling and removes part of the curvature of the roll).
It should be noted that the process of leveling the grid Road mesh pneumatic wheel roller is one of the most important stages.
- Fixation Nets
After leveling the grid maximum attention should be paid to fix the mesh (anchoring).
Fixation of each roll should be carried out on the perimeter as well as the entire area in the transverse and longitudinal direction. Embedment depth: not less than 50mm in the asphalt layer and from 40 to 50 mm in concrete. It must be remembered that the anchorage should be carried out only on the double twisting wire without touching the wire edges and transverse reinforcing rods. To fix, you can use nails, dowels and construction pistols. As an anchor to use steel plate 50 × 50mm and a thickness of 3 mm. Brand building rounds - D3, D4.
Team of workers that produce anchoring nets, should be, of 4 persons on the roll width of 3 m of 7 people on two parallel-arranged roll width of 3 m, from 5 persons on the roll width of 4m and so on. Thus, the rate will be achieved anchoring a roll length of 50 m in 20-30 minutes.
Fixing the grid road mesh performed.
Use a tight grid pattern anchoring road mesh only for the first 4 feet of each roll. For the rest of the roll anchoring step should be 1m in the longitudinal and transverse directions.
Do not fix the end of each roll, to enable him to straighten up under the asphalt in the direction of stacking. If necessary, instead of nails, you can use a protective layer of the finished bitumen emulsion mixture device for thin monolithic seal over the mesh road mesh. Mixing and laying on the roadway is carried out using a specially designed mobile units. Upon completion of the work necessary to protect the coating on the movement of up to achieve the required strength.
- Filling bitumen emulsion
After secure fixation is necessary to make the grid filling bitumen emulsion according to the current regulatory and technical documentation.
- Asphalt paving mixture and its seal
When laying the top layer of asphalt pavement should be remembered that the minimum allowable thickness of the coating on top of the grid road mesh is 80mm, and therefore, need to be set at the proper thickness of asphalt stacked asphalt concrete pavement.
If the asphalt raises the net at arrival at the initial part of the next roll, it is recommended to cover this area with a thin layer of asphalt by hand - this will prevent direct contact of the paver and the grid. This section shall not exceed 1.5m in length, so as to increase its length will lead to uneven cooling of the asphalt pavement. During laying asphalt mixture in any case should not be pushed in front of any vehicle to avoid skidding stacker.
Upon completion of paving asphalt to make it standard procedure for sealing using special rollers.
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