Vacuum supercharge combined prepressing experiment device

Abstract

The invention discloses a vacuum supercharge combined prepressing experiment device which comprises a cylinder body, a piston, sealing parts and a pressure measurement pipe, wherein a top cover of the cylinder body is provided with guide openings communicated with the inside of the cylinder body; the piston comprises piston heads and a vacuum pressurizing bin, the vacuum pressurizing bin is provided with an external port connected with an external vacuumizing device and an opening penetrating through the piston heads to be communicated with the inside of the cylinder body; the piston is movably arranged in the cylinder body, the piston heads of the piston are arranged in the cylinder body, the vacuum pressurizing bin extends out of the cylinder body from the guide openings of the top cover of the cylinder body, the piston can descend or ascend in the cylinder body; the sealing parts are arranged on a contact part of the vacuum pressurizing bin and the guide openings of the top cover of the cylinder body, a closed supercharge pressurizing bin is formed among the piston heads, the inner wall of the cylinder body, the top cover and the outer wall of the vacuum pressurizing bin, a pneumatic joint connected with an external pneumatic device is arranged on the top cover of the cylinder cover, corresponding to the supercharge pressurizing bin; and the pressure measurement pipe is communicated with the inside of the cylinder body below the piston heads of the piston. According to the vacuum supercharge combined prepressing experiment device, the overlapped supercharge under a vacuum load can be realized.

Description

technical field [0001] The invention belongs to the field of experimental devices, in particular to a vacuum surcharge combined preloading experimental device. Background technique [0002] Soft soil is widely distributed along the coast and in some inland areas of our country. With the rapid development of the economy, a large number of buildings or structures are built on soft soil foundations. However, the bearing capacity of soft soil foundations is weak and often requires foundation reinforcement. , in order to meet the needs of engineering construction. At present, the vacuum-surcharge combined preloading method is a main method for strengthening soft soil foundations. The vacuum-surcharge combined preloading method treats the foundation. First, a sand cushion layer of a certain thickness (usually 40-50 cm) is laid on the surface of the original foundation. Then drive bagged sand wells or plastic drainage boards into the soil as vertical drainage bodies. The air-tigh...

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Problems solved by technology

However, the theoretical research of this new construction method is far behind the engineering practice.

Due to the lack of theoretical research, indoor experimental research is necessary to solve engineering practical application problems. At present, when conducting experimental research, only vacuum preloading research or surcharge preloading research can be carried out alone, and it is impossible to realize the vacuum preloading research. Under the condition of superimposed load, vacuum-heap load joint preloading experiment is carried out

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