Inorganic high-performance shield tunnel segment

Abstract

The invention relates to the technical field of concrete, in particular to an inorganic high-performance shield tunnel segment. The inorganic high-performance shield tunnel segment is formed by pouring the following raw materials: a cementing material, a mineral admixture, a filling material, water, a dispersing agent and fibers; the mass ratio of the cementing material to the mineral admixture to the filling material to the water to the dispersing agent to the fibers is 1:(0.3-0.5):(1.2-1.5):(0.10-0.18):(0.03-0.05):(0.25-0.5). The shield tunnel segment provided by the invention has the characteristics of being high in impermeability, high in crack resistance, fire resistance, explosion resistance and impact resistance, good in durability, acid and alkali salt corrosion-resistant, light in structure weight, and the like, and can greatly reduce the shield construction excavation area, improve the tunnel fire rating and the anti-seismic performance and reduce the overall construction cost.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to an inorganic high-performance shield tunnel segment. Background technique [0002] In recent years, my country has started large-scale construction of underground railways in several large cities. Since the shield tunnel construction technology can minimize the impact on other facilities in the city, it is gradually becoming the mainstream technology for subway tunnel construction. Shield tunnel construction is a fully mechanized construction method, which is to push the shield machine in the ground, support the surrounding rocks through the shield shell and segments to prevent collapse, and at the same time use cutting devices in front of the excavation face. The excavation of the body is carried out of the hole by excavation machinery, and the jack is pressed in the rear to push in, and the precast concrete segments are assembled to form a shield tunnel. In a shield tunnel, ...

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Problems solved by technology

Although this utility model has made certain anti-corrosion treatment to the steel pipe sheet, the steel material cannot guarantee that the steel pipe sheet will not be corroded after long-term use in the complicated underground environment. , but it cannot satisfy the ever-growing tunnel engineering construction

For concrete materials, the C50 concrete category is mainly used at this stage, and the following problems exist in the use process: 1. The design thickness of the general concrete segment is 1 / 20 of the diameter of the ring. With the development of tunnel engineering, the diameter of the ring continues to increase. As the size of the segment increases, the structural size of the segment becomes thicker and the weight becomes larger, which causes great inconvenience to the construction and installation. At the same time, the outer diameter of the excavation continues to expand, and the construction cost increases seriously; 2. The concrete material is non- For homogeneous materials, internal micro-cracks in the segment itself lead to insufficient impermeability, resulting in water seepage after installation and use. Therefore, most projects perform secondary lining or surface waterproof treatment on the external grouting of the segment. In order to increase the anti-seepage performance; 3. In the process of segment production, surface cracking and cracking in the construction and installation process occur, and the performance of resisting corrosive media such as underground saline and alkali is insufficient, and special surface treatment is required; 4. The fire resistance of the material itself is poor, and the material itself belongs to Brittle material, local explosion resistance and impact resistance are poor, prone to collapse and damage

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