Upper-closed low-position vacuum preloading system and construction method: Fid-Bau Portal

Upper-closed low-position vacuum preloading system and construction method

ZHENG SHAOHE

The invention discloses an upper-closed low-position vacuum preloading system and a construction method. The system comprises a vertical drainage subsystem, a horizontal drainage subsystem and a vacuumizing subsystem. According to the thickness of an upper water-permeable and air-permeable layer and a soft soil layer to be reinforced, the length of a vertical drainage pipe and a drainage plate is determined, the vertical drainage pipe is clamped into a bayonet of a traction steel plate in a casing pipe from the bottom of the casing pipe of the plate inserting machine after being connected through a vertical pipe-plate adapter, and the vertical drainage pipe is driven into the soil layer along with the casing pipe after being lifted to the designed height. And the conversion joint is positioned in a range of not more than 500mm below the soil layer interface. The vertical drainage pipe exposed out of the earth surface is connected with an earth surface drainage system and connected with a vacuum pump through a gas-liquid separation device for vacuum preloading. According to the invention, the vacuum degree is ensured not to be lost, the vacuum degree is directly transmitted to a lower soft soil layer, and the vacuum preloading effect is improved; construction procedures are greatly reduced, the laying period is shortened by more than half, and cost is saved by more than 30%.

本发明公开了一种上部封闭式低位真空预压系统及施工方法，该系统包括竖向排水子系统、水平排水子系统和抽真空子系统；根据上部透水透气层和拟加固的软土层厚度，确定竖向排水管和排水板的长度，通过竖向管‑板转换接头连接后，将竖向排水管从插板机套管底部卡入套管内的牵引钢板的卡口内，提升至设计高度后，然后随套管一起打入土层中，使转换接头的位于土层交界面以下不大于500mm范围内。将出露地表的竖向排水管连接地表排水系统，通过气液分离装置与真空泵相连，进行真空预压。本发明保证了真空度不受损失，使真空度直接传递到下部软土层中，提高了真空预压的效果；大幅减少施工工序，缩短铺设工期一半以上，节约成本30％以上。

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