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Tinmgeosynthetics's blog

TINM team provides customers with customized geomembrane services.

https://idgeomembrane.com/pre-seamed-geomembrane/ 

Material customization:

TINM team provides HDPE geomembrane, LDPE geomembrane ,LLDPE geomembrane,PVC geomembrane,and 

chinese geomembrane shpre-seamed geomembranespre-seamed geomembrane

1 Geogrid reinforcement applications:

This process is applicable to the soft foundation treatment of municipal roads and highway projects, the reinforcement of pavement, embankment and filling slope, and the treatment of landslide and collapse

Repair and other works.

2 Geogrid reinforcement for roads main application standards and specifications:

2.0.1 technical code for application of geosynthetics (GB50290-1998)

2.0.2 geosynthetics plastic geogrid (GB / t17689-2008)

2.0.3 geosynthetics geogrid for Traffic Engineering (JT / t480-2002)

https://idgeomembrane.com/geogrid-reinforcement-for-roads/

3 construction preparation


3.1 technical preparation

3.1.1 carefully study the relevant requirements of Geogrid reinforcement for roads construction drawings and various construction specifications before commencement.

3.1.2 measure the subgrade elevation before laying the geogrid.


3.2 material preparation

The geogrid used for the reinforcement of embankment slope adopts two-way geogrid. The width of geogrid is not less than 3.0m and the tensile strength is

Not less than 30KN / m, elongation ≤ 10%.

The Geogrid of pile net composite foundation used for soft foundation reinforcement adopts two-way geogrid, which adopts high-strength polyester fiber, polyester and poly

Ethylene and other materials are used for soft foundation reinforcement. The tensile strength is determined according to the calculation, but generally not less than 80KN / m. The width of geogrid is ≥ 5.0m,

Elongation ≤ 10%

When the drainage consolidation method is adopted for construction, the geogrid can be unidirectional geogrid, and the tensile strength is determined according to the calculation, which is generally not less than

50KN/m。

Before the geogrid is laid, the performance of each batch of products shall be tested by the qualified product quality supervision and inspection center authorized by the state,

The detection frequency shall not be less than 3 groups, and the laying can be carried out only after it is qualified. The construction quality shall comply with the national standard technical code for application of geosynthetics

(GB50290-1998)。


4 construction operation process

4.1 process flow

4.2 survey setting out and site cleaning

4.2.1 measure and set out the construction site according to the construction specifications and design requirements.

The original ground shall be cleaned and rolled, and the base treatment is the same as that of general subgrade filling construction. The subgrade shall be carried out after the treatment is completed and the inspection is qualified

Layered filling.


4.2.2 when the filling height reaches the elevation of the designed Geogrid reinforcement for roads and geocell, the measurement shall be carried out on the qualified filling surface

Measure and set out, and determine the position of laying geogrid and geocell according to the design requirements.

4.3 construction method

4.3.1 laying shall be carried out within the measured range. The geogrid is laid flat on the subgrade, the outer edge is generally 0.1M away from the slope, and the laying width is

Set according to the design requirements.

4.3.2 folds are not allowed during laying, and they shall be tightened. After paving, fix it with U-shaped iron nails or bamboo nails.


4.3.4 when the grid is paved, the hard soil layer shall not be covered, and the surface shall be leveled in time

Direct exposure to the sun for a long time.

4.3.4 when laying geogrid, the length of transverse lap and longitudinal lap shall meet the design requirements.

4.3.5 after the geogrid is paved, the filler shall be filled in time. When the filler is not paved, mechanical vehicles shall not walk on it.

4.3.6 plastic geogrid can be divided into longitudinal stress and transverse stress according to the design requirements. The laying of geogrid shall be in strict accordance with the design requirements

Laying is required by the design.

4.3.7 the dump truck dumps the filler along the edges of both sides of the reinforced material to form an access road for soil transportation, and tension the plastic grid. fill

The materials are not allowed to be directly unloaded on the plastic grid, but must be unloaded on the paved soil surface: the unloading height should be no more than 1m, and

Avoid insufficient local bearing capacity. The soil shall be paved immediately after unloading to avoid local subsidence. After the construction access road is filled, it is on both sides

Fill symmetrically to the center parallel to the central line of the embankment, and keep the filling construction surface in a “U” shape.

4.3.8 the first layer of fill on the plastic grid should be paved by light bulldozer or front loader, all vehicles and construction machinery

Only driving along the axis of the embankment is allowed.

4.3.9 the geogrid is overlapped 30cm longitudinally and 50cm transversely.

4.3.10 the longitudinal and transverse surfaces shall be fixed with L-shaped nails.

4.3.11 spacing of anchor nails: 50cm in both vertical and horizontal directions. In order to ensure that the lap joint of plastic grid meets the requirements of tensile strength, it is in “L” shape

On the basis of nail anchorage, the lap joint is bound with 22 double strand iron wire, and the binding node spacing is 15cm.

4.3.12 the geogrid is fixed from the middle of each mesh.

5 key points of quality control

5.1 quality control

5.1.1 the quality of raw materials shall be spot checked according to the specified frequency and standards, and protection shall be strengthened during construction to prevent pollution and damage.

5.1.2 the surface of the lower bearing layer of geosynthetics shall be leveled and compacted, and the hard protrusions on the surface shall be removed.

5.1.3 when laying geosynthetics, the direction with high strength shall be placed in the main stress direction of embankment. When there are special requirements in the design

Laying according to design.

5.1.4 after the geosynthetics are paved, the folded section shall be paved back according to the design requirements and covered with sand in time.

5.1.5 it is strictly prohibited to roll or walk on Geosynthetics directly by rolling and transportation equipment.

5.1.6 the overlapping and anchoring width shall meet the requirements.

5.1.7 the original ground drainage shall form a 4% crown.

5.1.8 laying geosynthetics belongs to concealed works. Quality inspection personnel shall be responsible for on-site monitoring and inspection of concealed works during construction

Record and report to the supervisor for signature before the construction of the next process.

6 quality precautions

6.1 during the laying of Geogrid reinforcement for roads, the direction with high strength shall be placed perpendicular to the axis of embankment.

6.2 the surface of the soil layer where Geogrid reinforcement for roads materials are laid shall be flat, and there shall be no hard protrusions such as debris and block stones on the surface. After paving, it shall

When filling, the filler shall be filled to avoid direct exposure to the sun for a long time. Generally, the interval shall not exceed 48h.

6.3 all vehicles and construction machinery are only allowed to travel along the axis of the embankment after the geogrid is paved with fill.

6.4 the geogrid shall not be damaged during construction to ensure the project quality.

6.5 during paving, it shall be straightened and smooth without distortion and fold.

6.6 when laying between plastic gratings, the direction with high strength shall be placed perpendicular to the embankment axis.

6.7 the connection between plastic gratings shall be firm. The strength of the joint in the stress direction shall not be lower than the design tensile strength of the material, and

The overlapping strength shall not be less than 15cm.

6.8 the plastic grating shall be laid without wrinkles and shall be tensioned manually. If necessary, the plastic grating can be fixed by inserting nails and other measures

Fill surface.

6.9 the surface of the soil layer on which the plastic grid is laid shall be flat, and there shall be no convex objects such as debris and block stones on the surface; At a distance of 8 cm from the plastic grid layer

The maximum particle size of Embankment Filler in shall not be greater than 6 cm.

6.10 the filler shall be paved and rolled in layers, and the selected filler and its compactness shall meet the requirements specified in the design.

6.11 the first layer of fill on the plastic grid should be paved by light bulldozer or front loader, and all vehicles and construction machinery should be used only

It is allowed to drive along the axis of the embankment.

6.12 it is forbidden to directly roll all mechanical equipment on the grid surface.

The construction of Expressway is not only an inevitable development trend, but also a national task that must be completed. Under such a premise, how can we build expressways quickly and stably? Naturally, it has become a problem that every construction team needs to pay attention to. Any material or method that can provide help for the construction of expressway will also be popularized. HDPE Geocell gradually appears on the road construction sites of major expressways under this background.
https://idgeomembrane.com/honeycomb-geocell-for-gravel-driveway/

geocell for gravel driveway

In the traditional road construction, people have been used to laying cement and gravel materials on the ground, and then paving asphalt and other materials after being flattened by roller.
The road paved by this method does not have enough durability. Once a car exceeding the load-bearing capacity of the road passes by, the road is bound to be crushed, and the road surface may also have some problems.

geocell roadAdvantages of geocell for gravel driveway:

1. Honeycomb geocell can be stretched and folded freely during transportation. During construction, it can be stretched into a network and filled with loose materials such as soil, gravel and concrete to form a structure with strong lateral strength and high stiffness.
2. Light material, wear resistance, stable chemical properties, light and oxygen resistance, acid and alkali resistance, suitable for different soil and desert conditions.
3. It has good lateral performance, skid resistance and deformation resistance, and can enhance the bearing capacity of the subgrade and disperse the load.
4. Changing geometric dimensions such as geocell and welding distance can meet different engineering needs.
5. Flexible expansion, small transportation volume, convenient connection and fast construction speed

geocell road construction

Moreover, although geocell is now often used in relatively flat pavement sections, it also has excellent performance even in some anti-skid and erosion control projects, which can effectively enhance the foundation bearing capacity of subgrade. geocell for gravel driveway is also required for railway subgrade? The scientists conducted relevant experiments, and the final experimental results proved that the stability provided by the geocell is enough to support the operation of the railway and prolong the service life of the project.

Notice:

When paving the pavement with reinforced geocell, it is necessary to ensure that the pavement is flat and thoroughly clean the paved pavement. The main reason for this step is to ensure that the force dispersion is complete and uniform.
Assuming that there is a bulge or depression in the layer laid in the geocell, the geocell will be subjected to uneven stress. Originally, the scattered force of each supporting surface will eventually be concentrated in a separate geocell, which will inevitably cause a chain reaction. Like dominoes, the whole road structure began to collapse gradually.
In addition, when using geocell, we should try our best to ensure the integrity of our own geocell. One or two gaps may not have much impact, and geocells in other locations can share the force that this part of the missing geocell needs to bear. If the construction area of the grid is large, the construction team must use the new grid to build the road.

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