Supporting process of portal frame type anchor pipe soil nail spraying net and modified reinforcing cement mortar employed by same
A gantry type, cement slurry technology, which is applied in basic structure engineering, sheet pile wall, excavation and other directions, can solve the problems of prolonging the construction period, reducing the speed of earthwork excavation, and prolonging the exposure time of the foundation pit, so as to save the construction period and improve the Early strength, adaptable effects
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Embodiment 1
[0050] Soil samples were taken from a construction site in downtown Wenzhou, and one soil sample at a buried depth of 2.6m (silty clay) and 5.0m (silt) was taken for chemical composition analysis. According to the analysis of chemical composition, triethanolamine, brine, Seven kinds of chemical admixtures such as water glass are used as composite additives, which are compounded with cement, raw gypsum powder and fly ash. Since there is no testing machine specially suitable for the indoor compressive strength test of cement and soil, this test uses the mortar test model (7.07cm×7.07cm×7.07cm) and the small pressure mortar testing machine in the building materials laboratory. The dried soil sample is crushed on a mill, and after sieving, the above-mentioned materials and tap water that have been weighed in proportion in advance are put into the mixing pot in a certain order, mixed manually with a mixing shovel, and then put into the test mold twice. Vibrate 50 times with a steel...
Embodiment 2
[0071] Such as figure 2 Shown is the layout of the surrounding environment of a certain foundation pit in Wenzhou. The foundation pit is 123 meters long and 82 meters wide. The south side of the foundation pit is close to the main road (10 meters away from the side of the repaired road surface), and there are water pipes passing through the roadside; there are commercial houses 12 meters away from the north side, 2 private houses 10 meters away from the east side, and the west side is close to the road (with the repaired road side). The distance between the sides of the road is 10 meters); the depth of the foundation pit is 4.9 meters. Based on the above circumstances, the foundation pit in Wenzhou cannot be supported by conventional soil nailing spray nets, but should be supported by "bored piles + internal supports". In the case of conventional soil nail spray net support, the cost is about 2,300 yuan / long meter; while the "bored pile + inner support" support, the cost is ...
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