Method and structure for leakage seepage prevention construction for two-walls-in-one structure of deep-underground engineering

Abstract

The invention discloses a method and a structure for leakage seepage prevention construction for a two-walls-in-one structure of a deep-underground engineering. The construction method comprises the following steps: processing and manufacturing a capillary drainage strip; foundation pit excavation, vertically chiselling a flat joint for allowing the capillary drainage strip to be accommodated in along a joint seam of an underground diaphragm wall; seizing a steel reinforced base plate (at the bottom of a lining wall) at the bottom of the foundation pit, horizontally arranging a plurality of water collecting pipes in the steel reinforced base plate along the underground diaphragm wall, and forming a slot opening in the position at the top of the water collecting pipe and corresponding to the end part of the capillary drainage strip; inserting the lower end of the capillary drainage strip in the slot opening, and sealing the joint between the capillary drainage strip and the water collecting pipe through spreading silicone glue onto the smooth surface of the capillary drainage strip; and laying the capillary drainage strip in the flat joint from the bottom to the top along the joint seam of the underground diaphragm wall, and allowing the grooving surface of the capillary drainage strip to face towards the underground diaphragm wall. The capillary drainage strip is used for cutting off water source for drainage redirection and dredge, so as to guide the water seepage between the underground diaphragm wall and the lining wall to enter the water collecting pipes for diversion.

Description

technical field [0001] The invention relates to an anti-seepage and anti-leakage used for the two-wall-in-one structure of deep underground engineering, in particular to an anti-seepage construction method and structure for the two-wall-in-one structure of deep underground engineering. Background technique [0002] At present, deep underground projects mostly adopt the "two-wall-in-one" structure of underground diaphragm wall and inner lining wall. The structural self-waterproofing system is based on structural self-waterproofing, focusing on joint waterproofing such as deformation joints and construction joints, supplemented by a waterproof layer outside the structure for enhanced waterproofing. [0003] After the completion of the structure, groundwater seepage occurred mainly in the lining wall, gradually covering the entire wall and extending to the bottom and roof, and its distribution was mainly in the horizontal construction joints, deformation joints, vertical and in...

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Problems solved by technology

2. The horizontal displacement of the underground diaphragm wall continues to increase with the increase of the excavation depth, resulting in the joints of the underground diaphragm wall being affected by the tension joints, which has an adverse effect on the anti-seepage measures in the early stage

3. During the sequential construction of the main structure, with the removal and unloading of the steel support, the enclosure structure was disturbed many times, especially due to the influence of the shield construction, the construction of the hidden section of the multi-layer structural slab was postponed, and the balance between the newly established underground diaphragm wall The state is constantly changing and continues to move horizontally into the pit, which has a negative impact on the joint sealing measures carried out in the early stage

4. During the pouring process of the lining wall, the groundwater is affected by the high pressure of the groundwater outside the pit, and it is necessary to find a breakthrough in the weak point in the wall concrete that has not yet finalized, resulting in through cracks and leakage channels, reducing the compactness and density of the wall concrete. Impermeability

[0004] Long-term groundwater leakage will have adverse effects on the environment, underground engineering maintenance, especially the operation of internal electromechanical systems. At the same time, repeated and large-scale use of polyurethane and other plugging materials will also have adverse effects on the environment. There is an urgent need for a long-term and effective solution to groundwater. Approaches to Leakage Problems

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