Grouting-free soil nailing device suitable for temporary support of side slope and construction method of grouting-free soil nailing device

Abstract

The invention discloses a construction method of a grouting-free soil nail device suitable for temporary support of a side slope. The construction method comprises the following steps that (1) a plurality of reinforced rod piece cones, a plurality of twisted steel bars and a plurality of rubber limiting clamps are manufactured; (2) each twisted steel bar is sleeved with a plurality of rubber limiting clamps and fixed, and then the reinforced rod piece cone and the twisted steel bars are welded to form the grouting-free soil nail device; (3) a temporary side slope or a foundation pit slope surface is excavated; (4) a plurality of grouting-free soil nail devices are pressed into the side slope, and the hook structures are exposed; 5) binding a slope surface reinforcing mesh on the surface of the slope, and fixing the slope surface reinforcing mesh with the hook structure; (6) concrete is sprayed to the side slope; (7) after the concrete strength reaches the standard, the next layer of side slope is excavated; and (8) the steps (4)-(7) are repeated, and supporting of the whole slope is completed. The anti-pulling performance of the soil nail is guaranteed, and the complex procedure of grouting type soil nails is omitted.

Description

technical field [0001] The invention relates to the field of side slope temporary support, in particular to a grouting-free soil nailing device suitable for side slope temporary support and a construction method thereof. Background technique [0002] The soil nail wall is based on the principle of the new Austrian method, and the reinforced rod cone is set close to the horizontal in the slope body of the natural slope, the artificial slope or the excavated slope of the foundation pit; a steel mesh is laid on the surface of the slope, And spray a layer of concrete surface layer; the reinforced rod cone in the slope body is firmly bonded with the surrounding soil to form a complex, relying on the soil nail group to produce a reinforcement effect, and a similar gravity retaining wall formed with the surface layer The supporting structure; the in-situ reinforcement technology that improves the mechanical properties of the overall geotechnical system and thus improves the stabili...

AI Technical Summary

Problems solved by technology

The grouting type soil nailing refers to that the cone of the reinforced rod is directly driven into the soil, and the cement slurry is pressed to form a soil nail. It has the advantage of directly driving the nail and has a high pull-out resistance, and is suitable for holes that are difficult to form. Temporary slope engineering in soft soil layers such as silt and muddy soil, but the cost is higher than that of direct driving soil nails

[0004] However, at present, in temporary slope, foundation pit support and other projects, the drilling and grouting type and the grouting type soil nails are mostly used, and the direct driving type soil nails are seldom used, mainly because the direct driving type The diameter of the soil nail is small, and the frictional resistance between the soil nail and the surrounding soil is low, so the bearing capacity of the direct driving soil nail is low, and it is easy to cause relative sliding to cause failure; however, compared with the direct driving soil nail, the drilling injection The process of grouting and grouting soil nailing is more complicated and the cost is higher. It is used in temporary slope and foundation pit support, which is not convenient for improving construction speed and saving engineering cost.

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