What are the laying methods of geogrids, and what are the general laying methods of geogrids?

The paving surface of the geogrid should be relatively smooth, after the experience of the paving layer is qualified, in order to prevent the longitudinal skew phenomenon, first draw a white line or hanging line in the paving layer according to the width, you can start paving, and then fix the end of the grid with iron nails (8 nails per meter wide, and the uniform distance is fixed).

After fixing the end of the grille, the grille is slowly pulled forward with a paving machine, and each 10-meter-long shop is manually tightened and straightened once until a roll of grille is paved, and then a roll is laid, and the operation is the same as before.

After laying a roll, you can use a 6t-10t roller to roll it in the forward direction from the starting point. (If paved on the middle surface layer and the leveling layer, it is advisable to use a steel roller; If the grid is directly laid on the concrete pavement, it is advisable to use a rubber roller. ）

Paving: Take the roll length as the unit as the section length of the laying, and after the section length of the grille should be paved, check the paving quality as a whole, and then pave the next section. When the next section is paved, the grid and the grid can be lapped with a length of 10-15cm, and fixed with iron nails or wooden wedges and then continue to lay the second section in the forward direction.

And so on, and the operational requirements are the same as before.

1) Geogrid working mechanism: due to the high tensile strength of geogrid, the stability of the embankment can be increased; The existence of the grid mesh restricts the lateral movement of the soil, forms a good interlocking effect, and makes the soil have a good overall shear resistance. The geogrid has a certain stiffness so that the load above can be diffused, and the bearing capacity of the foundation is improved.

Requirements for geogrid: geogrid adopts biaxially tensile (GSL) geogrid, with a longitudinal ultimate tensile strength of not less than 25kn per linear meter, a transverse ultimate tensile strength of not less than 35kN, and an elongation of no more than 13%; The mesh size of the geogrid is 30mm 40mm, and the rib section is rectangular.

2) Laying of the bottom geogrid.

The geogrid is fully laid, and the scope of the geogrid is marked with bamboo piles (or wooden piles), and then laid.

Laying requirements: 1. The geogrid is smooth and straight; The width of both sides is the same width as the roadbed. The connection method is connected by seam seepage and loss jointing method, and the two adjacent geogrids are sewn by interwoven high-strength polypropylene belts;

2. Or adopt the lap method, the lap width is not less than 25cm, and fix it with "U" nails.

Geogrid construction is divided into foundation treatment, geogrid laying, filling, rolling grid, and grid paving.

1. Foundation treatment: First of all, the base layer is leveled and rolled, the flatness is not more than 15, the degree of compaction reaches the design request, and the appearance is forbidden to have solid protrusions such as gravel and block stones.

2. Geogrid laying:

1) When storing and laying geogrids, avoid exposure to the sun and long-term exposure, and avoid functional inferior combustion and grinding.

2) Laid perpendicular to the direction of the line, the lap meets the requirements of the design drawings, the joint is strong, the strength of the connection in the direction of the force is not lower than the design tensile strength of the data, and the overlapping length is not less than 20cm.

3) The quality of the geogrid conforms to the rules of the design drawings.

4) The construction adheres to continuity, does not show distortion, wrinkles, stacking, pays attention to the tension of the grille to make it stressed, and uses artificial tension to make it even, flat, and close to the lower bearing surface, and uses nails and other methods to fix.

5) When the geogrid, the direction of the long hole is consistent with the direction of the line cross-section, and the geogrid should be straightened and flattened. The grille ends are handled as designed.

6) Fill the filler in time after the geotechnical leather grid is paved, and the interval time does not exceed 48h, so as to avoid its direct exposure to the sun.

3. Filling: After the grid is laid, it should be filled in time. The filling is carried out symmetrically according to the principle of first two ends, and it is forbidden to fill the middle of the embankment first.

The filler is not allowed to be unloaded directly on the geogrid, it is necessary to unload it on the soil surface that has been paved, and the discharge height is not more than 1m. All vehicles and construction machinery are not allowed to walk directly on the paved geogrid, and are only allowed to travel in the direction of the embankment.

4. Roll the grid: After the layer fill reaches the predetermined thickness and is rolled to the design compactness, the grid is rolled back to the bag 2m and tied to the upper layer of the Huai layer geogrid, and manually trimmed and anchored, and the soil is 1m on the outside of the roll end to protect the grid and avoid artificial damage.

5. Complete the paving of a layer of geogrid according to the above-mentioned method, and carry out the paving of other layers of grating according to the same method. After the grille is paved, the upper embankment filling begins.

This is a project that can be directly constructed, because if he is in it, the projects he constructs are all used in it.

Anchoring method, fiberglass geogrid without self-adhesive strengthens asphalt concrete pavement and prevents pavement-to-pavement reflection cracks.

The viscous layer oil is AH-70 or AH-90 heavy oil hot asphalt, and the specifications and quality of the viscous layer oil should be in line with the "Technical Code for Highway Asphalt Pavement Construction" JTJ032-94, and special vehicles are used to spray. The amount of viscous layer oil per square meter is about.

When laying fiberglass geogrid, it should be kept smooth and tight, the transverse lap length should be 50-100mm, the longitudinal lap length should be 150-200mm, and according to the paving direction, the rear end should be pressed under the front end.

Rolled with a rubber-tyred roller.

50 50 fixed iron sheet, required to be smooth and not warped, chamfered around the perimeter, 2 inches of steel nails (high-quality cement nails).

When laying the fiberglass geogrid by the nail fixing method, one end is first fixed on the substructure that has been sprinkled with adhesive asphalt with a fixed iron sheet and a nail, and the nail can be shot in with a hammer or a shooting gun.

When the grille is tightened longitudinally, the glass fiber is in a straight and tensioned state transversely.

Definition of geogrid: a two-dimensional grid or a three-dimensional grid screen with a certain height made of polypropylene, polyvinyl chloride and other polymers by thermoplastic or molding, when used as a civil engineering, is called geogrid.