Construction method of plastic geogrid
Construction method of plastic geogrid Process flow: test, clean up the sub-bearing layer → artificial laying of geogrid → lap, tying, fixing → paving the upper layer of roadbed soil → rolling → test
Construction method of plastic geogrid
Process flow: test, clean up the sub-bearing layer → artificial laying of geogrid → lap, tying, fixing → paving the upper layer of roadbed soil → rolling → test
Geogrid construction points:
1ã€Construction site: compacted and levelled, horizontal, and remove spikes and protrusions.
2, grating laying: in the site of levelling and compaction, installation of paving grating its main direction of force (longitudinal) should be perpendicular to the direction of the embankment axis, paving should be flat, no wrinkles, as far as possible tension. Fixed with nails and soil and stone weight, the main stress direction of the grating is preferably through the length of no joints, the connection between the width and width can be artificially tied lap, lap width of not less than 10cm. such as the setting of the grating in more than two layers, the layer should be staggered between the layers. After laying a large area, adjust its straightness as a whole. When filling and covering a layer of soil, not before rolling, should be again with artificial or mechanical tension grating, strength should be uniform, so that the grating in the soil for taut force state.
3, filler selection: filler should be selected according to the design requirements. Practice has proved that, in addition to frozen soil, swamp soil, domestic waste, chalk, diatomaceous earth can be used as filler. But gravel soil and sandy soil mechanical properties are stable, affected by the water content is very small, should be preferred. Filler particle size shall not be greater than 15cm, and pay attention to the control of filler grading to ensure compaction weight.
4, filler paving and compaction: when the grating paving position, should be filled in time to cover, bare time shall not exceed 48 small is, can also take the side of paving backfill flow operation method. First in the two ends of the paving filler, the grille fixed, and then to the middle of the advance. The order of crushing is the first two sides after the middle. Rolling when the pressure wheel can not directly contact with the tendon material, uncompacted reinforced body generally do not allow vehicles to drive on it, so as to avoid tendon material dislocation. Layered compaction is 20-30cm. compaction must meet the design requirements, which is also the key to the success or failure of the reinforced soil project.
Geogrid construction method:
1, get in touch with us paving surface should be relatively flat, paving layer after acceptance, in order to prevent longitudinal skewing phenomenon, first according to the width of the paving layer in the white line or hanging line, you can start paving, and then use nails to fix the end of the grating (8 nails per metre wide, even distance fixed).
2, after fixing the end of the grille, use the paving machine to slowly pull the grille forward to pave, every paving 10 metres long to manually tighten and straighten once, until a volume of grille paving, and then pave the next volume, the same operation as before.
3ã€After paving a volume with 6T-10T road roller from the starting point to the forward direction can be crushed once (such as paving in the middle of the level and find the plane, with a steel roller roller is appropriate. If the grating is directly laid on the concrete road surface, it is appropriate to use rubber roller roller).
4, paving: the volume length as a unit of paving section length, should be paved grating section length after paving, now the whole check the quality of paving a paving, and then paving the next section, the next section paving, grating and grating can be used with a 10-15cm lap length, and fixed with nails or wedges to continue to the forward direction of the paving of the second section. And so on, the operation requirements are the same as before.
Geogrid construction process (detailed examples):
Process: testing, clean up the lower bearing layer → artificial laying geogrid → lap, tie, fixed → paving the upper layer of roadbed soil → rolling → testing.
Geogrid is laid on the levelled lower bearing layer according to the width required by the design, and its upper and lower layers of filler are free from debris that punctures the geogrid, and when laying geogrid, the direction of high strength is arranged perpendicular to the direction of the embankment axis. Geogrid horizontal laying. Laying taut, pulling quite, to avoid wrinkles, twisting or potholes. Geogrid along the longitudinal splicing using lap method, lap width of not less than 20cm.
After paving the geogrid, manually lay the upper layer of filler, complete the crushing in time to avoid long-term exposure to the sun. Then use machinery to transport materials, levelling, rolling. Mechanical paving and rolling advance from both sides to the middle, and rolling is carried out from both sides to the middle, and its compaction is maintained to meet the specification requirements.
Eliminate all construction vehicles and construction machinery travelling or parked on the paved geogrid, check the quality of geogrid at any time during the construction, and repair or replace depending on the degree of damage such as breakage, puncture and tear.
Sand bedding layer Sand bedding layer adopts medium (coarse) sand, the mud content and other impurities should be less than 5%.
2. Machinery:
Choose 25T plate vibratory roller and 50T plate drag vibratory roller each one, 140 bulldozer one, workers 7-8 people with the construction.
3ã€Construction method
(1) first accurately put out the roadbed slope line, in order to ensure the width of the roadbed, each side of the widening of 0.5m, the drying of good subsoil levelling with 25T vibratory roller static pressure two times, and then with 50T vibration pressure four times, uneven places with artificial levelling.
(2) Paving 0.3m thick medium (coarse) sand, artificial with mechanical levelling, 25T vibration roller static pressure twice.
(3) Laying geogrid. Geogrid paving should be flat, dense, generally should be laid flat, straight, no overlap, no curling, kinking, adjacent to the two geogrids need to lap 0.2m, and along the roadbed transverse to the geogrid lap part of the interspersed connection every 1m with the No. 8 wire, and in the paving of the grating, every 1.5-2m with a U-type nails fixed to the ground.
(4) After the first layer of geogrid is laid, start to fill the second layer of 0.2m thick medium (coarse) sand, its method: the car carries sand to the site unloaded on the side of the roadbed, and then use the bulldozer to rush forward to push the first 2 metres on both sides of the roadbed within the scope of filling 0.1m after the first layer of geogrid folded over up to fill 0.1m again in the middle of the sand, prohibit the two sides of the middle of the filling and advancing, and prohibit all kinds of machinery in the middle of the sand that has not been filled (coarse). Prohibit all kinds of machinery to pass on the geogrid without filling medium (coarse) sand, so as to ensure that the geogrid is smooth, not bulging, not wrinkled, to be the second layer of medium (coarse) sand levelling, to carry out horizontal measurements, to prevent uneven thickness of filling, to be the levelling of the 25T vibratory roller static pressure two times.
(5) The second layer of geogrid construction method with the first layer of the same method, and finally fill 0.3m of medium (coarse) sand, filling method with the same first layer, with 25T roller static pressure two times, so that the roadbed base reinforcement is completed.
(6) in the third layer of medium (coarse) sand crushing is good, along the line of road longitudinal slope on both sides of the laying of geogrid two, lap 0.16m, and with the same method of connecting the good, and then start the earth construction operations. Laying geogrid for slope protection, must be measured out of each layer of laying side line, each side to ensure that the slope rectification after geogrid buried in the slope 0.10m.
(7) slope geogrid every fill two layers of soil, that is, the thickness of 0.8m on both sides of the need to lay a layer of geogrid, and so on, until the shoulder surface soil under the pavement.
(8) After the roadbed is filled, the slope will be repaired in time, and the dry masonry schist protection will be carried out at the foot of the slope, and the roadbed of this section will be widened by 0.3m on each side, and 1.5% of the sinking volume will be reserved.
