Tension and compression complementary type anchor cable structure adopting external anchoring and locking and construction method thereof

Abstract

The invention discloses a tension and compression complementary type anchor cable structure adopting external anchoring and locking and a construction method thereof. The anchor cable structure comprises an anchor cable hole and an anchoring system, wherein the anchoring system comprises an anchor cable body, an outer anchor head and an inner anchor head; the anchor cable body comprises tensile type steel strands, pressure type steel strands, casing pipes, a corrugated pipe, an expansion ring, a shroud ring, a primary grouting pipe, a secondary grouting pipe and an exhaust pipe; the tensile type steel strands and the pressure type steel strands which are positioned at the middle of the anchor cable bundle are sleeved with the casing pipes and a free section is formed by grouting the anchor cable hole through the primary grouting pipe; the upper part of the anchor cable bundle is sleeved with the corrugated pipe, and secondary grouting is performed on the corrugated pipe after the anchor cables are tensioned; the hole wall between the corrugated pipe and the anchor cable hole is filled with gravels and grouted through the primary grouting pipe to form a cement-aggregate cementation body, namely the external anchoring section; the pressure type steel strands at the lower part of the anchor cable bundle are sleeved with the corresponding casing pipes while the tensile type steel strands at the lower part of the anchor cable bundle are not sleeved with the casing pipes and an internal anchoring section is formed by grouting the anchor cable hole through the primary grouting pipe. According to the tension and compression complementary type anchor cable structure adopting external anchoring and locking and the construction method thereof, the internal anchoring section and the external anchoring section have a combined action, so that the framed girder counter force is reduced; besides, the outer anchor head and the external anchoring section have a combined action, the risks that the outer anchor head is out of work or the stressing loss occurs are reduced.

Description

technical field [0001] The invention belongs to the slope reinforcement technology of geotechnical engineering, and particularly relates to a tension-compression complementary external anchor locking anchor cable structure, and also relates to a construction method of the tension-compression complementary external anchor locking anchor cable structure, which is especially suitable for engineering geological conditions Poor unfavorable geological slope or special rock and soil slope. Background technique [0002] Unfavorable geological slopes or special rock and soil slopes, especially structurally modified rock masses, generally undergo metamorphism and alteration, forming a large number of minerals with poor water stability. Joint fillings, weathering products of the rock mass itself, or special rocks and soils are easily softened when exposed to water, and the shear strength of the rock mass will be sharply reduced during the rainfall process, and landslides are easily for...

AI Technical Summary

Problems solved by technology

[0004] In addition, after the conventional anchor cable system is stretched, the outer anchor head is used to lock. However, because the bearing capacity of the rock and soil on the slope surface is reduced after being exposed to water, it is difficult to guarantee the reaction force of the frame beam, which may easily cause the failure or failure of the outer anchor head lock. Prestress loss

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