Water-rich stratum open cut underground structure composite waterproof structure and construction method

Abstract

The invention discloses a water-rich stratum open cut underground structure composite waterproof structure and a construction method. The composite waterproof structure comprises a bottom plate composite waterproof structure, a side wall composite waterproof structure and a top plate composite waterproof structure which are used for integrally arranging a main body structure in the middle in a surrounding mode, the bottom plate composite waterproof structure sequentially comprises a soil layer, a cement mixing pile, a concrete cushion layer, a first HDPE waterproof sheet and a first rapid hardening waterproof coating from bottom to top, the side wall composite waterproof structure sequentially comprises a high-pressure jet grouting pile, an enclosure structure, a base plane leveling layer, a second HDPE waterproof sheet and a second rapid hardening waterproof coating from outside to inside, and the top plate composite waterproof structure sequentially comprises a backfill soil layer, a concrete protection layer and a third rapid hardening waterproof coating from top to bottom. According to the composite waterproof structure, the advantages of several common waterproof methods are integrated, the disadvantages of the common waterproof methods are made up, the waterproof reliability can be greatly improved on the premise that the waterproof engineering operation cost is slightly improved, and the repair and maintenance cost in the operation period is greatly reduced.

Description

technical field [0001] The invention relates to the field of underground engineering, and more specifically, relates to a composite waterproof structure and a construction method of an open-cut underground structure in a water-rich stratum. Background technique [0002] The leakage problem of a large number of underground projects, especially the leakage problem during operation, is difficult to be properly solved, especially in the water-rich formations near rivers, lakes or coastal areas, the problem is more serious. First of all, groundwater directly reacts with concrete, which will cause corrosion of steel bars and directly reduce the durability of the structure; second, water leakage will cause mildew damage to the interior decoration of the structure, and even cause safety accidents on power supply lines, bringing huge hidden dangers to operations . Due to the characteristics of underground engineering, once a problem occurs, the cost of repairing is extremely high an...

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Problems solved by technology

[0004] 1. Water-stop around the structure, that is, a continuous water-stop body used to prevent or reduce groundwater from flowing into the foundation pit is applied on the periphery of the main body of the project, such as continuous mixing piles, rotary jetting piles, etc. This method can greatly strengthen the foundation pit and effectively reduce water and soil pressure , but it is difficult to completely prevent groundwater infiltration

[0005] 2. The structure is self-waterproof, that is, relying on the impermeability of the concrete itself to achieve the waterproof effect. This method is easy to operate, but the tensile strength of the waterproof concrete is low, and cracks are prone to occur, resulting in the overall loss of impermeability of the structure.

[0006] 3. Waterproof board, that is, a waterproof board is installed between the enclosure structure and the main structure to achieve a water-proof effect, but the material of the waterproof board is generally brittle, and the combination of the waterproof board and the rough-surfaced enclosure structure is poor. Once the waterproof board Partial damage occurs, and the waterproof performance of the entire structure will easily fail due to water channeling

[0007] 4. Waterproof coating, that is, after the construction of the enclosure structure, the waterproof coating is sprayed before the construction of the main structure. This method can form a waterproof membrane with a certain deformation ability and no seams, but the waterproof membrane is generally low in strength and rough on the surface. The enclosure structure is easily damaged

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