Prestressing anchor body assembly type frame hoop slope protection device and construction method

Abstract

The invention discloses a prestressing anchor body assembly type frame hoop slope protection device and a construction method. The prestressing anchor body assembly type frame hoop slope protection device comprises a frame hoop used for restraining a slope surface and an anchor structure used for tightly pressing the frame hoop. An integrated anchor body (6) is formed by concrete bamboo joint blocks (2), connecting discs (3) and a screw (1), wherein the concrete bamboo joint blocks (2) and the connecting discs (3) are arranged and distributed alternately. An anchor hole (7) is formed in the slope surface of a soil body. The anchor body (6) is placed in the anchor hole (7), and the gap between the anchor body (6) and the anchor hole (7) is filled with concrete mortar. The construction method comprises the key steps that the integrated anchor body (6) is formed by all the concrete bamboo joint blocks (2), all the connecting discs (3) and the screw (1); and the anchor body (6) is placed in the anchor hole (7), and the concrete motor is poured into the gap between the anchor hole (7) and the anchor body (6). By the adoption of the structure and method, the construction speed can be increased, the construction period can be shortened, field construction is convenient and fast, the anti-drawing strength and the shearing strength are both ideal, the restraining effect on the soil body is good, the tightness degree can be adjusted along with the expansion and contraction of the soil body conveniently, and the slope protection area of the frame loop can be changed freely.

Description

technical field [0001] The invention relates to the field of reinforcement of expansive soil slopes, in particular to a pre-stressed anchor assembly type frame hoop slope protection device and a construction method for preventing the slope of expansive soil from shallow slides and collapses. Background technique [0002] Swelling soil and other soils have significant expansion and contraction, fissures and over-consolidation, and the slope after excavation of the above soil will undergo repeated water absorption and water loss shrinkage under the action of atmospheric force. Expansion and contraction deformation, that is, the formation of the expansion and contraction active layer; and the release of the over-consolidation stress will cause the soil to unload and relax and deform, that is, the unloading release layer is formed. As a result, the structure of the surface expansive soil is loose, cracks develop in the dry season, and the intensity is very low in the rainy seaso...

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Problems solved by technology

[0004] The slope protection device of the prior art and its construction method have the following disadvantages: 1. After the anchor rod and the anchor cable are put into the anchor hole, the cement mortar needs to be filled, the pouring amount on site is large, the construction speed is slow, and it is necessary to wait for the cement to dry hard. The construction period is extended; 2. The bond strength and frictional resistance between the anchor rod or anchor cable and the cement mortar are not ideal, which leads to the unsatisfactory pullout strength of the anchorage system, which is not conducive to restraining the deformation of the soil; 3. The soil changes with the seasons. After expansion and contraction, there will inevitably be a gap between the pressure plate or the frame hoop, and it is difficult to adjust the tightness of the anchorage in the prior art, let alone apply pre-stress to the anchor rod and anchor cable; The constrained area is insufficient, and the frame hoop of the concrete structure needs to be poured on site. The pouring volume is large, and there are also problems such as slow construction speed, waiting for the cement to dry hard, and long construction period.

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