Molding device and molding method for long spiral extruding rock-entering cast-in-place pile

Abstract

The invention discloses a molding device and a molding method for a long spiral extruding rock-entering cast-in-place pile. The molding device comprises a drilling device formed by assembling a drill stem and a drill arranged at the bottom of the drill stem coaxially, a lowering / lifting system, an electric rotating driving mechanism for driving the drilling device to rotate continuously, a slip casting device for grouting casting slip into molded drill holes continuously to form bored piles when the lowering / lifting system lifts the drill stem, a drilling depth / lifting height detecting unit, a pumping flow detecting unit, a controller and a parameter input unit connected with the controller. The molding method includes: 1 setting initial parameters; 2 drilling; 3 further processing after drilling is in place; and 4 lifting the drill and slip-casting simultaneously. The molding device and the molding method are reasonable in design, easy to use and operate, high in automation, easy in molding process, easy in controlling of pile quality, wide in application range and capable of solving a plurality of problems in the existing molding devices and molding methods for the long spiral extruding rock-entering cast-in-place pile.

Description

technical field [0001] The invention belongs to the technical field of foundation construction, and in particular relates to a forming device and a forming method for a long spiral extruded cast-in-place pile. Background technique [0002] At present, in foundation projects such as construction, water conservancy, and highways, long spiral hole-forming cast-in-situ piles are widely used due to their advantages of high speed, low noise, no need for mud retaining walls, and low construction costs. However, in the actual construction process, the existing common long spiral hole-forming cast-in-situ piles have the following defects and deficiencies: first, the scope of application is limited, and it can only be applied in soil layers such as cohesive soil, silt, and filling soil. When sand pebble stratum or large-diameter pebble layer, then drilling is difficult or can't be drilled into; Thereby, the soil layer adaptability of existing long spiral hole-forming cast-in-situ pile...

AI Technical Summary

Problems solved by technology

However, in the actual construction process, the existing common long spiral hole-forming cast-in-situ piles have the following defects and deficiencies: first, the scope of application is limited, and it can only be applied in soil layers such as cohesive soil, silt, and filling soil. When sand pebble stratum or large-diameter pebble layer, then drilling is difficult or can't be drilled into; Thereby, the soil layer adaptability of existing long spiral hole-forming cast-in-situ pile is insufficient, and some areas cannot adopt; Second, existing long spiral hole forming The filling pile cannot enter the rock, so the pile end cannot be placed in the soil layer with high bearing capacity after the pile is formed, resulting in practical problems such as the low bearing capacity of the single pile; third, after the existing long spiral hole-forming cast-in-place pile is formed, the pile end After the soil is disturbed, it is easy to form virtual soil at the bottom of the hole, which reduces the resistance of the pile tip, thereby affecting the bearing capacity of the single pile; fourth, the quality of the pile body is difficult to guarantee: after the existing long spiral hole-forming cast-in-place pile is holed, the drill pipe is lifted while pouring When lifting, the lifting speed should be compatible with the pumping speed, and there should be more than 0.1 cubic meters of stock in the drill pipe to ensure that the drill pipe discharge port is continuously discharged under pressure, otherwise it is easy to break the pile, shrink the diameter, and get mud Fifth, the quality of pouring is difficult to guarantee: in the construction process of the existing long spiral hole-forming cast-in-situ pile, most of them rely on manual observation of the shrinkage and expansion of the concrete delivery pipe and the discharge of the drill pipe vent hole. According to the observation results, the lifting speed is controlled to match the pumping speed. There are sensory differences and experience differences in manual observation, which cannot effectively ensure the perfusion quality.

Images