A trough reinforcement structure of ultra-deep underground diaphragm wall in coastal reclamation area and its construction method

Abstract

An ultra-deep underground diaphragm wall trough reinforcement structure in a coastal reclamation area and its construction method, the structure includes an upper reinforcement structure within a range of 30m and a lower reinforcement structure below the range of 30m, and the upper reinforcement structure is reinforced with triaxial stirring piles. Good, it has better reinforcement and water-stop effect; in the range below 30m, due to the high water and soil pressure in the reclamation area near the sea, the reinforcement effect cannot be guaranteed by using a single groove wall reinforcement method, so the high-pressure rotary jet pile is used for reinforcement first, and then the sleeve valve is used for reinforcement. The grouting makes up for the possible defects of the high-pressure rotary jetting pile. The invention combines the advantages of the three-axis stirring pile, the high-pressure rotary jet pile and the grouting of the sleeve valve pipe, and can achieve a better reinforcement effect of the groove wall during the construction of the underground continuous wall, and is especially suitable for the ultra-deep underground continuous wall in the coastal reclamation area. Reinforcing the wall into a groove is a safe, effective, economical and reasonable method for reinforcing the groove wall.

Description

technical field [0001] The invention belongs to the field of groove wall reinforcement, in particular to a groove-forming reinforcement of an ultra-deep underground diaphragm wall in a sea-front reclamation area and a construction method thereof. Background technique [0002] With the continuous development of construction projects in my country, various deep and large foundation pits, such as foundation pits with a depth of 20 to 30 meters, have emerged in large numbers. For deep and large foundation pits, the underground diaphragm wall has become a very important form of support. Due to the lack of the "circular arch effect" similar to supporting piles during the construction of the underground diaphragm wall, the stability of the groove is relatively poor. Therefore, when the geological conditions are poor, the groove wall is often reinforced before the construction of the diaphragm wall. Slot construction. [0003] According to the current construction experience of un...

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Problems solved by technology

[0004] The purpose of the present invention is to provide an ultra-deep underground diaphragm wall trough reinforcement structure and construction method in the seaside push-fill area, to solve the problem that the underground diaphragm wall groove wall is prone to collapse due to the high groundwater level and unstable soil in the sea-side push-fill area It is also necessary to solve the technical problems of the underground diaphragm wall in the coastal reclamation area when the reinforcement depth of the underground diaphragm wall exceeds 30m. Due to the high water and soil pressure, the reinforcement effect of the existing single reinforcement method is poor and the groove wall is more likely to collapse, especially there are still groove walls. Stable, difficult to form the reinforced body, difficult to meet the technical problems of the reinforcement effect

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