Vacuum-heating combined foundation drainage tester

Abstract

The invention discloses a vacuum-heating combined foundation drainage tester, which comprises a soil sample chamber outer-wall, an upper cover plate, a lower pedestal and a weighing device. The soil sample chamber outer-wall is a steel cylinder with two ends opened. A lower port of the soil sample chamber outer-wall is arranged in an annular groove of the lower pedestal, and an upper port of the soil sample chamber outer-wall is arranged in an annular groove of the upper cover plate. The soil sample chamber outer-wall, the upper cover plate and the lower pedestal form a space which is a soil sample chamber. At least a heating rod is arranged inside the soil sample chamber. The bottom of the heating rod is vertically and fixedly installed on the lower pedestal. The heating rod is electrically connected to a heating controller outside the soil sample chamber. At least one vacuum-pumping tube which is communicated with a vacuum pump outside the soil sample chamber is arranged inside the soil sample chamber. A temperature sensor used for detecting temperature of a soil sample is arranged inside the soil sample chamber. A pressure sensor used for detecting absolute pressure is arrangedinside the vacuum-pumping tube. The lower pedestal is placed on the weighing device. By the use of the weighing device, water mass loss of a soil sample inside the soil sample chamber is measured.

Description

technical field [0001] The invention belongs to the technical field of construction engineering test instruments, in particular to a vacuum combined heating foundation drainage test instrument. Background technique [0002] The prominent feature of the newly dredged supersoft soil is that the surface strength is extremely low, and its foundation treatment is a recognized problem at home and abroad. This kind of foundation is generally reinforced by drainage consolidation method. In my country, surcharge preloading method, vacuum preloading method or vacuum combined surcharge preloading method are mainly used. However, the conventional drainage consolidation method is used to reinforce the newly dredged and filled mud and floating mud. After 3 to 5 months of preloading and reinforcement, the settlement of the foundation is relatively significant, often exceeding the theoretical calculation by a lot, but the strength after reinforcement The increased value is small and cannot...

AI Technical Summary

Problems solved by technology

However, the conventional drainage consolidation method is used to strengthen the newly dredged and filled mud and floating mud. After 3 to 5 months of preloading and reinforcement, the settlement of the foundation is relatively significant, often exceeding the theoretical calculation by a lot, but the strength after reinforcement The increased value is small and cannot meet the use requirements of the foundation

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