Ventilation anchor rod capable of achieving automatic wind collection and exhaust and construction method

Abstract

A ventilation anchor rod capable of achieving automatic wind collection and exhaust and a construction method are suitable for frozen earth slope supporting. The automatic wind capturing ventilation anchor rod structurally comprises an anchor pipe, a ventilation pipe, a wind collection system and an anchor tool. The anchor rod is divided into a free segment and an anchoring segment by taking a baffle as the boundary, and the outer portion of the free segment is sleeved with the ventilation pipe. The wind collection system comprises a wind inlet pipe, a wind outlet pipe, an unpowered wind cap,a wind direction plate and a transition connecting part. Slurry is injected to the anchoring segment of the anchor pipe, so that the anchoring segment and surrounding soil are bonded, the outer portion of the anchor pipe is sleeved with the ventilation pipe, the anchor pipe and the ventilation pipe are anchored to the surface of a slope through the anchor tool, and the anchor pipe and the ventilation pipe are exposed out of the surface of the slope; and a first bent pipe C and a second bent pipe D in the wind collection system are connected with the exposed ventilation pipe and the exposed anchor pipe through hoops. According to the ventilation anchor rod, the natural ventilation principle and the anchoring principle are combined, and a frozen earth slope anchoring structure capable of automatically collecting wind at a wind inlet, naturally extracting wind at a wind outlet, utilizing natural wind energy to the largest extent and therefore reducing the temperature of a slope body in anaccelerated manner is provided.

Description

technical field [0001] The invention relates to an anchor rod construction technology in the field of slope support, and is suitable for engineering reinforcement of permafrost slopes in cold regions. Background technique [0002] Permafrost is a variety of rocks and soils with a temperature at or below 0°C and containing ice. my country is the third largest permafrost country in the world after Russia and Canada in terms of permafrost area. The permafrost area accounts for about 75% of the total land area, mainly distributed in the northwest and northeast regions. With the implementation of my country's western development strategy and the gradual shift of the focus of economic construction strategy to the central and western regions, the infrastructure construction in permafrost regions has continued to develop, and a large number of slope projects in cold regions have been produced. The stability of slopes in cold regions has become an important research topics. [0003]...

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Problems solved by technology

[0003] Under the influence of global warming, more and more permafrost slopes are experiencing freeze-thaw landslides. At present, the main measures to prevent freeze-thaw landslides include reducing the groundwater level and water content of the slope to reduce soil mass. Harm caused by frost heaving and thawing settlement; using engineering structures or ecological protection measures to enhance the anti-sliding ability of the slope; using non-frost heaving coarse aggregate instead of frost heaving soil to ensure the stability of the slope, but these measures are Passive control technology cannot fundamentally solve the problem of thermal thawing and slumping of permafrost slopes. From the perspective of protecting permafrost, active cooling has become the current mainstream permafrost slope protection concept

The patent with the application number 201610044592.6 proposes an accelerated convection ventilation cooling anchor pipe and construction method. This invention comprehensively utilizes the chimney effect principle, freezing technology, shape memory polymer and anchoring technology to "actively" protect frozen soil and carry out anchoring The patent with the application number 201710143649.2 has been improved on the basis of the above patents, and a power-free accelerated convection bolt and construction method are proposed. The flow speed of the hot gas in the ventilation anchor pipe can be increased through the power-free accelerator, thereby accelerating the ventilation anchor pipe. The convective heat transfer of the above two inventions is that both of them can only accelerate the gas exchange at the air outlet pipe, and there is a problem that the use of natural wind energy is limited, the effect of ventilation and cooling is not significant enough, and the natural wind direction cannot be actively selected. Therefore, it is urgent Need to find a ventilation anchor that can maximize the use of natural wind energy

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