Composite waterproof layer for underground engineering and its preparation and construction method

Abstract

The invention provides a composite waterproof layer for underground construction and a manufacturing and construction method of the composite waterproof layer. The method comprises the steps that an under layer of an underground construction building or a primary lining of a tunnel structure is constructed, macromolecule waterproof sheets are paved on the surface of the under layer, and lap-joint treatment is carried out at the positions between the adjacent macromolecule waterproof sheets through welding or gluing or lap joint; quick-setting rubber asphalt waterproof coatings are sprayed on the surfaces of the macromolecule waterproof sheets, a composite waterproof layer of the under layer is formed by bonding the quick-setting rubber asphalt waterproof coatings and the macromolecule waterproof sheets, and the quick-setting rubber asphalt waterproof coatings are quick-setting macromolecule emulsion waterproof coatings formed by emulsion crosslinking of emulsified asphalt, macromolecule rubber modifying agents and additional agents; reinforcing steel bars are bounded on the composite waterproof layer, and a concrete structural layer is casted.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a method for preparing and constructing a composite waterproof layer for underground engineering, and a composite waterproof layer for underground engineering. Background technique [0002] At present, in underground engineering, such as tunnel waterproofing of subways, highways or railways, two methods are generally adopted as follows. [0003] One is a composite lining tunnel, which is generally fixed on the concrete surface by a polymer waterproof board (roll material), and combined with the concrete to play a waterproof role, but it has many performance defects, mainly in: [0004] 1. The material of the waterproof membrane itself cannot be closely attached to the shotcrete primary lining (cushion layer). If an impact or protrusion on the concrete surface occurs during installation, the waterproof board will easily be punctured, resulting in water leakage. [0005] 2. The ...

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Problems solved by technology

[0004] 1. The material of the waterproof membrane itself cannot be closely attached to the shotcrete primary lining (cushion layer). The impact during installation or the protrusion on the concrete surface will easily puncture the waterproof board, resulting in water leakage.

[0005] 2. The joint between the board and the board is the weak link of the tunnel. If there is a slight crack inadvertently, the entire waterproof system will fail

[0006] 3. Concave-convex parts or even large cavities are prone to appear on the concrete wall surface. The extrusion and peripheral deformation of the secondary lining will cause the waterproof board to stretch, especially the joint part is prone to fracture and damage

[0007] The other is an ordinary spray-coated waterproof tunnel. The reason for the leakage of this underground engineering waterproof system is that it is difficult to ensure the uniformity of the spray-coated quick-setting rubber asphalt waterproof membrane. Although the coating film has good ductility, but The tensile strength is low. If a large external force occurs, the structure will be deformed and displaced, which will easily lead to the rupture of the waterproof membrane and the failure of the entire waterproof system. In addition, this construction method requires high precision in the spraying construction process, but the general engineering is very difficult. Difficult to achieve. Although there is self-waterproof concrete, the working surface of the underground project is narrow, and the density and solidity of concrete vibration are difficult to meet the design anti-seepage requirements. In addition, the deformation joints of construction sutures are also the weak link of this waterproof measure.

[0008] Technologists are trying various efforts to improve the above shortcomings of existing waterproof materials, but there is still no suitable countermeasure so far. Therefore, the technical field is in urgent need of a new technology that can overcome the above problems or partially solve the above problems

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