An internal anti-corrosion system for shield tunnel segments lined with pvc sheets

Abstract

The invention discloses a PVC sheet shield tunnel segment inner corrosion prevention system with linings. The system comprises a plurality of lining segments and the corrosion prevention linings embedded in the inner walls of the lining segments. The lining segments and the corrosion prevention linings are spliced together and constructed into the tubular shape in a lining mode. Joints are formed between the lining segments. The corrosion prevention linings are connected into a whole in a lap joint mode through hot melting and embedded in the inner walls of the lining segments. The corrosion resistance of the segment structure is greatly enhanced. After the lining segments are spliced, hot melting and lap joint processing is conducted on local parts without corrosion prevention linings such as the seams between the corrosion prevention linings and holes in the corrosion prevention linings, and it is ensured that the shield tunnel has the reliable overall leakproofness. Materials of the segment structure are convenient to take, the construction process is mature, and the construction cost is not high; for a water drainage pipeline formed by the lining segments under the sewage environment, corrosion of corrosive substances to the segment structure is isolated, the defect that the shield tunnel is prone to leakage at the seams of the segments is eliminated, and good application prospects are achieved.

Description

technical field [0001] The invention relates to the technical field of shield tunnel structures, in particular to a shield tunnel segment structure with an anti-corrosion lining. Background technique [0002] At present, shield tunnels are mainly composed of prefabricated reinforced concrete segments spliced ​​and stacked by connecting bolts. After the prefabricated reinforced concrete segments are assembled and stacked, there are a large number of longitudinal joints and circumferential joints. When shield tunneling is applied to When deep-burying large-section drainage pipeline projects, because the sewage contains inorganic salts such as sulfate, sulfuric acid, magnesium salt, and ammonium salt, it has a strong corrosive effect on concrete, which will damage the concrete material and cause expensive Subsequent maintenance costs. [0003] The existing conventional practice is to directly smear the anti-corrosion material on the inner wall of the segment to achieve anti-co...

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Problems solved by technology

[0002] At present, shield tunnels are mainly composed of prefabricated reinforced concrete segments spliced ​​and stacked by connecting bolts. After the prefabricated reinforced concrete segments are assembled and stacked, there are a large number of longitudinal joints and circumferential joints. When shield tunneling is applied to When deep-burying large-section drainage pipeline projects, because the sewage contains inorganic salts such as sulfate, sulfuric acid, magnesium salt, and ammonium salt, it has a strong corrosive effect on concrete, which will damage the concrete material and cause expensive Subsequent maintenance costs

[0003] The existing conventional practice is to directly smear the anti-corrosion material on the inner wall of the segment to achieve anti-corrosion after the assembly and stacking of the reinforced concrete segment is completed. However, this treatment method has a short service life, is difficult to repair and replace, and has poor durability. It cannot meet the long-term use needs of municipal drainage tunnels

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