Functional gradient shield pipe sheet and producing method thereof

Abstract

The present invention relates to a reinforced concrete segment for shield-driven tunnel and its preparation method. It is a functional gradient segment, and is characterized by that it is formed from segment exterior protecting layer, reinforced concrete structure layer and fireproofing explosion-resisting layer. The described segment exterior protecting layer is composed of high-compact water-proofing layer, high-impervious protecting layer and reinforced concrete protecting layer.

Description

technical field [0001] The invention relates to a reinforced concrete segment for a shield tunnel and a preparation method thereof. Background technique [0002] After entering the 21st century, with the strengthening of the country's comprehensive strength and the needs of transportation infrastructure construction, the construction of China's transportation tunnels has entered a period of rapid development, especially major transportation tunnels such as long tunnels, urban subways, underwater tunnels, and subsea tunnels. The construction of the project will enter an unprecedented peak period. Due to its unique advantages, the shield method will surely become the main construction method for building cross-river and sea-crossing tunnels and urban subways. [0003] In a shield tunnel, the segment is the skeleton of the tunnel structure and the main body of waterproofing, as well as the most important and critical lining structural component. It is not only required to have...

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Problems solved by technology

[0005] ①Waterproof, impermeability, and corrosion resistance are not high, which affects durability

[0007] ②Large shrinkage and deformation, easy to crack, affecting volume stability and durability

[0008] Reinforced concrete segment strength requirements are relatively high, the amount of cementitious materials is relatively high, especially the amount of cement is large, and some segmental concrete does not even mix mineral admixtures, such as Guangzhou and Shanghai Metro C50 segmental concrete generally do not mix Or only a small amount of fly ash is added, which makes the concrete shrink and deform greatly, and shrinkage micro-cracks are prone to appear on the surface of the segment, resulting in poor crack resistance of the segment, which not only affects the appearance quality of the segment, but also affects the volume stability and durability of the segment sex

[0009] ③ fire resistance performance is not considered, there are hidden dangers

[0011] It is difficult for the shield segment designed and prepared by the existing single-layer technology at home and abroad to have high waterproof, high impermeability, high corrosion resistance, high crack resistance and high fire resistance at the same time, and it is difficult to meet the requirements of shield tunnels under high pressure and rich conditions. Water conditions, requirements for high impermeability and long service life of segments in harsh environments, and the resistance of shield tunnels to various accidental factors such as fire and explosion are not conducive to improving the service life of shield tunnels

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