An adaptive prestressed anchor composite soil nail wall and its construction method

Abstract

The invention provides a self-adaptive prestressed anchor rod combined soil nailing wall and a construction method, and belongs to the field of supporting and retaining engineering. The self-adaptiveprestressed anchor rod combined soil nailing wall comprises self-contraction soil nails, soil retaining plates, a fabricated framework and prestressed anchor rods. The construction method comprises the steps that the two ends of the wing edge of H-shaped steel of the fabricated framework are connected with cross-shaped connecting pieces through bolts; the prestressed anchor rods pass through reserved anchor holes of the cross-shaped connecting pieces, are driven into a soil body and are anchored to the cross-shaped connecting pieces through anchor ing tools; and the self-contraction soil nailspass through circular holes in the centers of the soil retaining plates and stretch into the soil body to be stuck in the soil retaining plates, the soil retaining plates are fixed to the wing edge of the side, close to the soil body, of the H-shaped steel through bolts, and therefore the self-adaptive prestressed anchor rod combined soil nailing wall is formed. The self-adaptive prestressed anchor rod combined soil nailing wall is simple in structure and high in assembling degree, the construction method is simple, convenient to use and practicable, and the defect that soil nails and prestressed anchor rods in an existing prestressed anchor rod combined soil nailing wall cannot work cooperatively is overcome.

Description

technical field [0001] The invention relates to slope soil engineering reinforcement technology and belongs to the field of retaining engineering. Background technique [0002] Composite soil nail wall is a new type of support structure developed on the basis of soil nail wall. It combines soil nail walls, deep mixing piles, rotary grouting piles, various micro piles, steel pipe soil nails and prestressed anchors, etc., and combines them according to specific engineering conditions to form a composite support structure. It expands the application range of soil nail walls. The existing prestressed anchor composite soil nail wall is generally composed of soil nails and prestressed anchor rods. For example, the patent application number CN200810089046.X discloses a composite soil nail wall structure. hole grouting type steel pipe soil nails to increase the anchoring force; the patent application number is CN200820040553. Enhance slope stability. However, the above two struc...

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Problems solved by technology

However, the above two structures obviously did not consider the cooperative work of soil nails and prestressed anchors, but it is very necessary to use the cooperative work of soil nails and prestressed anchors, because the prestressed anchors are prestressed, The displacement needed to fully develop its design pull-out force is very small, but the soil nail has no free section and does not need to be prestressed. It requires a large displacement to generate the design pull-out force, which may cause the bolt to fully exert its pull-out force. The soil nailing has not yet functioned, and the anchor may have been damaged when the soil nailing functioned

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