Positive and negative pressure combined vacuum preloading soft foundation reinforcing system and method

A positive and negative pressure and vacuum technology, which is used in the field of vacuum preloading and reinforcement of soft foundations, can solve the problems of vacuum attenuation along the depth, difficult to stabilize the settlement rate, and slow consolidation rate of deep soil.

Pending Publication Date: 2020-06-12
CCCC FOURTH HARBOR ENG INST +2
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  • Claims
  • Application Information

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Problems solved by technology

However, the vacuum preloading method also has the following limitations: first, the drainage consolidation time is relatively long, the settlement rate is difficult to stabilize, and it is difficult to estimate the post-construction settlement of deep soft soil; The reinforcement effect of deep soft soil foundation is not ideal, and the treatment dep

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  • Positive and negative pressure combined vacuum preloading soft foundation reinforcing system and method
  • Positive and negative pressure combined vacuum preloading soft foundation reinforcing system and method
  • Positive and negative pressure combined vacuum preloading soft foundation reinforcing system and method

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Embodiment Construction

[0034] The present invention is implemented according to the following steps:

[0035] (1) Clean up the debris on the construction site and level the site, and adjust the arch by 1%-2%;

[0036] (2) After laying a 30cm fine slag layer 2 on the surface of the soft foundation 1, lay the plastic drainage boards 3 in an equilateral triangle lattice arrangement until the design depth, the distance between the centers of the drainage boards 3 is 1.0m, and the plastic drainage boards 3 are 20-30cm exposed on both sides of the fine slag layer;

[0037] (3) Check the 3-board position, verticality, drilling depth, exposed length, etc. of the drainage board, and make construction records;

[0038] (4) Lay the main pipe 4 and the branch pipe 5 in the laid fine slag layer 2. The branch pipe 5 is provided with a plurality of round holes with a diameter of 20mm and a hole spacing of 2m. The row spacing of the branch pipes 5 is 1.5-2.0m. Two adjacent drainage boards are used for 3 rooms T...

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Abstract

The invention discloses a positive and negative pressure combined vacuum preloading soft foundation reinforcing system and method. The system comprises a vacuum water-gas separation device, a vacuum pump, a water suction pump and an air compressor, and further comprises vertical drainage plates, a main pipe and branch pipes, wherein the branch pipes communicate and gather the multiple vertical drainage plates together; the multiple branch pipes are gathered and communicate with the main pipe; the vertical drainage plates, the branch pipes and the main pipe communicate to form a pipe assembly;the pipe assembly is provided with a joint detachably connected with downstream equipment; when the detachably connected joint of the pipe assembly is connected to a water inlet of the vacuum water-gas separation device, the vacuum pump provides vacuumizing to form the negative pressure vacuum preloading soft foundation reinforcing system; and when the detachably connected joint of the pipe assembly is connected to the air compressor, the air compressor provides high-pressure gas to the pipe assembly to form a positive pressure pressurizing system. The system accelerates the soft soil foundation settlement speed, shortens the treatment period, increases the soft foundation treatment effective depth, effectively controls post-construction settlement, and achieves the excellent engineering application prospect.

Description

technical field [0001] The invention relates to the technical field of soft soil foundation treatment methods, in particular to a method for strengthening soft foundations by vacuum preloading combined with positive and negative pressures. Background technique [0002] Vacuum preloading method is an economical and effective soft soil foundation treatment technology. The method was first proposed in 1952 by Professor W. Kjellman of the Royal Swedish Institute of Geology. Due to the constraints of key technologies such as vacuum equipment, sealing materials, and vertical drainage bodies in the early stage, this method has not been well applied for a period of time. After the 1970s, with the breakthrough of the above key technical problems, the vacuum preloading method began to be widely used in soft foundation reinforcement projects, and achieved good economic and social benefits. Engineering practice shows that the vacuum preloading method has the advantages of low cost, ea...

Claims

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Application Information

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IPC IPC(8): E02D3/10
CPCE02D3/10
Inventor 董志良王婧
Owner CCCC FOURTH HARBOR ENG INST
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