Vacuum preloading device with sandbag cushion layer, and construction method thereof

Abstract

Disclosed are a vacuum preloading device with a sandbag cushion layer, and a construction method thereof. The vacuum preloading device comprises a vacuum pump, a vertical sandbag layer, a horizontal sandbag layer, geotextile, a clay sealing layer, a polyethylene sealing film and a split water sealing layer. The vertical sandbag layer, the horizontal sandbag layer, the geotextile, the clay sealinglayer, the polyethylene sealing film and the split water sealing layer are sequentially laid on the soil surface from bottom to top. A plurality of vacuum tubes communicated with the vacuum pump are embedded in sandbag gaps of the longitudinal sandbag layer, and a plurality of plastic drainage plates are fixedly inserted into the bottoms of sandbags of the vertical sandbag layer; the polyethylenesealing film is hermetically laid on the upper surfaces of the clay sealing layer and a film pressing groove; the split water sealing layer is arranged on the upper surface of the polyethylene sealingfilm. The vacuum preloading device and the construction method thereof have the advantages that the arrangement mode of conventional horizontal drainage bodies is changed, the flexible water-permeable and sand-permeable sandbags position the vacuum tubes and the plastic drainage plates and apply a certain downward pressure on the soil surface, and the plastic drainage plates, the sandbags and thevacuum tubes are assembled integrally; the vacuum preloading device has the advantages of stable shape, capability of not being affected by sedimentation and convenience in construction.

Description

technical field [0001] The invention relates to the technical field of soft soil reinforcement, in particular to a vacuum preloading device with a sandbag cushion and a construction method thereof. Background technique [0002] At present, since the vacuum preloading technology was introduced into our country, the vacuum preloading method has received a lot of theoretical research and engineering practice and promotion by researchers. The vacuum preloading method belongs to the green soft soil reinforcement technology. Compared with the high-pressure jet grouting method, it has the advantage of reducing water and soil pollution; it is cleaner and easier to control than the surcharge preloading method. Although vacuum preloading has obvious technical advantages, as the area of ​​reinforced soft soil increases, the disadvantages or contradictions of vacuum preloading technology are also exposed. The contradiction between the increase in sand consumption and the shortage of san...

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Problems solved by technology

Although vacuum preloading has obvious technical advantages, as the area of ​​reinforced soft soil increases, the disadvantages or contradictions of vacuum preloading technology are also exposed. The contradiction between the increase in sand consumption and the shortage of sand resources is becoming more and more obvious; As the reinforcement area increases, the problems of sand layer fracture and vacuum tube failure caused by uneven settlement are particularly prominent; the strict requirements of paving machinery and plugging machines on the construction work surface are more reflected

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