PFF integral composite reversed filtering layer and construction method thereof

Abstract

The invention discloses a PFF integral composite reversed filtering layer and a construction method of the PFF integral composite reversed filtering layer. The shape of the PFF integral composite reversed filtering layer is of a plate-shaped structure, the PFF integral composite reversed filtering layer is composed of a water-resisting layer, a reversed filtering water permeable layer and a reversed filtering water discharging layer. The reversed filtering water permeable layer is arranged between the water-resisting layer and the reversed filtering water discharging layer, and an integral structure is formed in a bonding mode. The PFF integral composite reversed filtering layer is placed at back of a slope face of a slope behind a stopping wall, has certain rigidity, can play the role of an inner formwork when the stopping wall is constructed, eliminates the working procedure for disassembling the inner formwork after construction of the stopping wall is finished, and therefore simplifies the construction process of the stopping wall. The construction quality of the PFF integral composite reversed filtering layer can be easily guaranteed.

Description

technical field [0001] The invention relates to the technical field of civil engineering, and specifically refers to a novel PFF integral composite reverse filter layer with the function of a formwork and a construction method thereof. Background technique [0002] The anti-filter layer installed on the back of the retaining wall mainly plays the role of filter layer, seepage and drainage, isolation and buffering. The loss of fine soil particles avoids the loss of soil behind the wall; its drainage function is to avoid or reduce the adverse effect and influence of water pressure on the wall by eliminating seepage or accumulated water behind the retaining wall; the isolation function refers to the reverse filter layer Placed between the rock and soil and the retaining wall, on the one hand, it can separate the rock and soil with different particle sizes and properties behind the wall from the retaining wall structure, so as to avoid the loss of soil particles (from the drain ...

AI Technical Summary

Problems solved by technology

Because the bulk aggregate filter layer has the characteristics of heavy weight, poor overall continuity, and poor formability, it has the following disadvantages: ①Inner formwork needs to be set up during the construction of the retaining wall, and many procedures for vertical molding and form removal are required. It is difficult to remove the formwork; ②The filter layer behind the wall is constructed after the overall pouring of the retaining wall. Due to the narrow construction space, the filter layer is not easy to form and be compacted, which is easy to cause quality and safety hazards; ③The bulk aggregate filter layer, the overall It is relatively loose, and not only is it easy to be eroded by running water to form holes during construction, but it is also easy to cause silting of the filter layer due to the mixing of fine particles of cohesive soil, and it is difficult to guarantee long-term use characteristics; ④ If the retaining wall is behind The construction quality of the reverse filter layer cannot be guaranteed (such as insufficient compaction or voids), which will directly affect the normal stress of the retaining wall project and the stability and safety of the high slope

The use of sandless concrete block filter layer has the following disadvantages: one, the excavation slope at the back of the wall is required to be quite smooth, otherwise there will be relatively large gaps between the sandless concrete block filter layer and the soil body, which is difficult to handle, which is difficult for the project. Quality and safety leave hidden dangers; in addition, due to the narrow construction space behind the wall, the construction is difficult, and it is easy to form gaps between blocks, which cannot guarantee the construction quality of the filter layer; thirdly, the filter layer of sand-free concrete blocks cannot also be used as a retaining wall formwork, and It is very difficult to set up the formwork behind the wall and remove the formwork

However, when the retaining wall is constructed behind the wall, it needs to bear a large earth pressure or a sliding force structure, and a drainage space of a certain thickness is required. Obvious deficiencies or quality problems are exposed in blocking drainage channels, etc., and cannot be directly applied to the reverse filter layer behind the wall of the retaining project;

[0007] In addition, the current filter layer of geotechnical materials cannot also be used as the formwork behind the wall, and there are still problems in the construction of concrete retaining walls such as formwork, formwork removal, and filter layer installation.

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