Construction method of high-protection flexible vertical anti-seepage system

Abstract

The invention discloses a construction method of a high-protection flexible vertical anti-seepage system, which ensures the construction rapidness and the construction quality, breaks through the technical barrier that various existing flexible vertical anti-seepage walls cannot realize large-depth construction and reliable connection, can realize axial cross connection, and can safely and rapidly perform large-depth construction. Specifically, the depth of the bentonite slurry diaphragm wall can be adjusted, the bottleneck problem that the depth of a lower membrane of a current domestic HDPE geomembrane diaphragm wall cannot exceed 30 m is substantially solved, and a choice which is high in safety, convenient to construct and high in reliability is provided for the field of HDPE geomembrane diaphragm walls.

Description

technical field [0001] The invention relates to technical fields such as solid waste landfill, petrochemical industry, water conservancy engineering, and urban underground engineering, and in particular relates to a construction method for a high-protection flexible vertical anti-seepage system used in related fields. Background technique [0002] Existing vertical anti-seepage systems generally use concrete anti-seepage walls, clay-bentonite mud anti-seepage walls, and HDPE geomembrane anti-seepage walls. Among them, HDPE geomembrane anti-seepage walls can easily achieve low permeability although the process is complicated. In addition, its integrity, corrosion resistance, and durability are relatively good, and it has gradually become the future development direction of vertical anti-seepage technology. [0003] For example, the Chinese patents whose publication numbers are CN102444145B and CN207143911U, at present, the HOPE geomembrane anti-seepage wall generally consists...

AI Technical Summary

Problems solved by technology

In the actual installation process of the above-mentioned existing vertical flexible barrier system, it is generally necessary to place one of the membrane groups in the process tank first, and the subsequent membrane groups are inserted and installed in sequence. It is assumed that the membrane group first placed in the process tank is the first The first membrane group is affected by factors such as the tension of the HDPE membrane itself, the buoyancy of the protective mud on the process tank wall to the HDPE membrane, and the fact that the connecting lock on the first module cannot be fixed well with the HDPE membrane. It will cause the end of the lock bar of the first membrane group to bend, twist, and swim freely. During the subsequent installation process of the membrane group through the connection lock, the overall verticality of the connection lock cannot be guaranteed, which greatly increases the difficulty of installation. , it may even lead to difficulty in installing the expansion waterstop or the inability to install it vertically and evenly. During the installation process, the expansion waterstop will be twisted due to the pulling of external forces, which is fatal and will directly affect the overall construction quality and anti-seepage coefficient

[0004]Due to the existence of the above problems, in order to ensure the construction quality as much as possible, the existing vertical anti-seepage system often cannot reach the preset depth. At present, the maximum laying depth in foreign countries is 25 meters , the theoretical maximum laying depth currently achievable in China is 30 meters, but in the actual construction process, it is often lower, unable to meet higher use requirements, and the effect is not good

Once the maximum laying depth is exceeded, there will be a series of problems as above, and these problems are continuous. Since each module is continuously spliced ​​and installed, the same problems will appear in the installation between adjacent modules, resulting in The installation process is irreversible, and ultimately the integrity of the entire vertical anti-seepage system cannot be guaranteed

Images