Device and method for enhancing stability of steel casing during pore-forming construction

Abstract

The invention discloses a device and method for enhancing the stability of a steel casing during pore-forming construction. The device comprises the steel casing. A plurality of grouting guide pipes used for filling cement slurry to a soil mass are welded to the outer sidewall of the steel casing. Each grouting guide pipe is provided with a plurality of slurry delivery holes at different heights.The device further comprises a plurality of slurry delivery branch pipes used for communicating with upper ports of the grouting guide pipes. Each grouting guide pipe is provided with a pressure sensor used for measuring the stress of the bottom of the grouting guide pipe. The device further comprises a plurality of pay-off length adjustable rope sheaves in one-to-one correspondence with the grouting guide pipes. A steel wire rope is led out from each rope sheave, and the tail end of the steel wire rope is provided with an end cap used for falling into the corresponding grouting guide pipe tocontrol the grouting height of the grouting guide pipe. The key of the method is to set the pay-off lengths of the rope sheaves in a compensatory mode according to reading numbers of the pressure sensors of the grouting guide pipes to obtain different reinforcement height. Through the device and method for enhancing the stability of the steel casing during pore-forming construction, the steel casing can be protected against transverse and vertical displacement.

Description

technical field [0001] The invention relates to the technical field of pile foundation hole-forming construction, in particular to a device and method for strengthening the stability of a steel casing during hole-forming construction. Background technique [0002] With the development of my country's economy, the number of large-scale municipal public projects such as large-scale bridges, large-scale wind power, and large-scale cross-river and sea-crossing tunnels is increasing. The above-mentioned projects will all involve the hole-forming construction of engineering pile foundations. During the hole-forming construction of engineering pile foundations, it is often necessary to preset steel casings, that is, the main body of the steel casings is placed into the soil by a static pile machine or a vibratory hammer. The top of the steel casing is about 30cm above the ground to position the center of the pile foundation, protect the wall to prevent the hole from collapsing, sta...

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Problems solved by technology

[0003] However, the steel casing retaining wall in the prior art hole-forming construction has the following defects: because the steel casing is self-heavy, the stability of the steel casing is very dependent on the bearing soil mass at its bottom, and the soil body inevitably has non-uniformity , that is, the strength and bearing capacity of the soil at different circumferential positions of the steel casing are different, and the vibration is more severe when the drill bit is drilling. When the bottom of the cylinder is opened, there is strong erosion and disturbance to the soil around the bottom; the above factors will cause the steel casing to move horizontally and vertically at the same time, making the pile position of the drilling rig out of alignment, and the drill bit and the steel casing to occur. The interference caused damage to both, and it was even impossible to continue drilling, or even if the bottom of the steel casing had been drilled, the drill bit could not be pulled out due to the horizontal and vertical displacement of the steel casing

Once the above accident occurs, a lot of manpower, material and financial resources will be wasted to deal with it.

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