What is the implementation standard of geogrid, geogrid specifications

Geogrid consulting Texas Oriental Geotechnical Materials Co., Ltd. ****.

The specifications of the geogrid are as follows:

1. Specifications of unidirectional plastic geogrid: 35kN, 50kN, 80kN, 120kN, 160kN, 200KN.

2. Specifications of biaxially oriented plastic geogrid: 15kN, 20kN, 30kN, 40kN, 45kN.

3. The width of the plastic geogrid can be 3 meters, 4 meters, 5 meters or 6 meters, and the roll length is 50m. The manufacturer produces plastic geogrids in strict accordance with the national standard (GB T17689-1999).

Construction precautions.

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 grid, the grid is slowly pulled forward with a paving machine, and each 10 meters long is manually tightened and straightened once, until a roll of the grid is paved, and then the next roll is paved, and the operation is the same as before, and after a roll is paved, the roller of 6t-10t starts from the starting point and rolls it in the forward direction.

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.

Geogrids are mainly divided into four categories: glass fiber geogrids, steel-plastic geogrids, polyester geogrids and plastic geogrids. The characteristics are as follows:

1. Glass fiber geotechnical clusters such as grating: high tensile strength, low elongation, no long-term creep;

2. Steel-plastic geogrid: it will not be eroded by acid, alkali and salt solutions, or oil at room temperature;

3. Polyester geogrid: high-strength polyester fiber warp knitted geogrid has high tensile strength, small elongation force, large tear strength, and small difference in vertical and horizontal strength;

4. Plastic geogrid: the tendency to deform under long-term continuous load is very small, and the creep resistance is much better than that of geogrid of other materials.

Geogrid is a kind of geosynthetic material, mainly used in civil engineering, according to the different materials, it is mainly divided into plastic geogrid, glass fiber geogrid, steel-plastic geogrid, and finished polyester geogrid. These geogrids are also used in different places in the project, and they play different roles. For example, plastic geogrid is mainly used for reinforcement of roadbed, and glass fiber geogrid is mainly used for crack prevention of asphalt pavement.

Fiberglass geogrid.

In some construction workshops, you can see something like a grid laid on the ground, this kind of thing is called geogrid, so, what is geogrid?

1. Geogrid is a major geosynthetic, which has unique properties and efficacy compared with other geosynthetics. It is often used as a reinforcement material for reinforced soil structure or a reinforcement material for composite materials.

2. Geogrids are divided into four categories: plastic geogrids, steel-plastic geogrids, fiberglass geogrids and polyester warp knitted polyester geogrids. The grid is a two-dimensional grid or a three-dimensional grid with a certain height made of polypropylene, polyvinyl chloride and other polymer polymers by thermoplastic or molding, and when used as a civil engineering, it is called a geogrid.

3. Geogrid is suitable for all kinds of embankment and roadbed reinforcement, slope protection, cave wall reinforcement, large airports, parking lots, wharves and freight yards and other long-term bearing foundation reinforcement.

Geosynthetics Plastic Geogrid (GB T17689-2008).

Construction shall not be carried out when the atmospheric temperature is lower than 10 degrees Celsius or when the road surface is wet. The asphalt surface course construction method is consistent with the ordinary asphalt pavement surface course construction method, but it should be noted that the construction vehicle shall not make a sharp turn and brake sharply on the surface surface of the glass fiber grille.

Self-adhesive fiberglass geogrid: convenient construction method and stable quality. For the old asphalt concrete pavement and the old cement concrete pavement, make a 20mm-30mm thick leveling layer, and use a vacuum truck or sprinkler truck to ensure that the road surface is clean and clean.

Spray AH-70 or AH-90 heavy oil hot asphalt, the dosage should be.

The special paving truck provided by our group is used to lay the self-adhesive fiberglass grid, which should be smooth and tight. The transverse lap length should be 50mm-100mm, the longitudinal lap length should be 150mm-200mm, and the overlap direction should be consistent with the direction of the asphalt concrete paver. Rubber-tyred rollers are used for rolling (rubber-tyred rollers need to have sprinkler devices).

It is more suitable for deep-sea operations and embankment reinforcement, and fundamentally solves the technical problems of low strength, poor corrosion resistance and short service life caused by long-term erosion of gabion made of other materials due to seawater erosion. It can effectively avoid the construction damage caused by being crushed and damaged by the machine during the construction process. It is suitable for roadbed reinforcement pavement enhancement of various highways, railways and airports.

It is suitable for permanent load-bearing foundation enhancement such as large parking lots and dock freight yards.

First of all, we must buy a good geogrid, high quality, quality is guaranteed!

There are more specifications for construction, and they are more detailed, so take your own time!

The direction of the geogrid is always perpendicular to the centerline of the roadbed.

1. Preparation for laying:

Foundation treatment: first of all, the lower layer is leveled and rolled, and the flatness is required to be no more than 15, and the degree of compaction meets the design requirements, and it is strictly forbidden to have hard protrusions such as gravel and stone on the surface.

Laying environment: outdoor temperature above 5, wind below level 4, no rain and snow. (except for environmental or special requirements).

2.Laying and lapping method:

Lay the geogrid according to the design width on the flat lower bearing layer, and the paving should be straightened and smooth, close to the lower bearing layer, and there shall be no twisting, wrinkling, overlapping, and the lap joint shall be fixed with U-shaped nails or connectors.

When the geogrid is laid, the direction of the main strength of the reinforcement is high perpendicular to the axis of the embankment, and the length of each overlap (longitudinal) is not less than 15, and is fixed with U-shaped nails or connectors, spacing, transverse lap length 30 90, and the lap position is fixed with U-shaped nails or nylon ropes.

3.Quality inspection after laying lap joints:

After the geogrid is laid, the self-inspection is carried out first, and its quality requirements are shown in the following table

Serial No. Project Construction Quality Requirements Inspection Method and Frequency.

1. The flatness of the lower bearing layer is 15mm, and 4 places are checked every 200m.

2. Longitudinal lap width 15cm, spot check 2%.

3 Transverse lap width: 30m, spot check 2%.

4 Lap seam staggered distance 50 spot check 2%.

4.Backfilling: After the geogrid material is paved in place, the filler should be filled in time to avoid direct exposure to the sun for too long, and under normal circumstances, the interval time should not exceed 48h.

Filler requirements: the maximum diameter of the embankment filling embankment material within 8 from the geogrid layer shall not be greater than 6, and the first layer of geogrid filling and paving should adopt a light bulldozer or a front-mounted loader, and the axis direction of the embankment is driven along the direction of compaction, and the thickness of filling compaction is greater than 60.

At present, there is no special geogrid reinforced soil construction specification in China, which can be done with reference to the laying requirements of the tensile belt in the "Technical Code for Highway Reinforced Soil Engineering Construction".

Geogrid width is most commonly used is 4 meters, and the length of a roll is commonly used to be 50 meters and 100 meters; The thickness of the grille is uncertain, the thickness of the steel-plastic grille and the plastic grille is about 2-3, and the thickness of the fiberglass grille is thinner; Gram weight is also reflected in technical indicators.

Volume Algorithm: Cylinder Volume: RR*h Can also be estimated as a rectangular Length*Width*Height Weight Algorithm: Unit Grammage * Total Area.

Example: two-way plastic grille 30-30kn width 4 meters, length 50 meters, measured 4 rolls, diameter between 35-41cm, some rolls are not round.

According to the above formula: the thickness is assumed to be 3mm

After 5000 * square, multiply by 2, there is a deviation of 2-3cm with the measurement. In addition, the plastic grille and steel-plastic grille are not rolled into a solid one, and there will be a certain deviation in the calculation.

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