Rotary cut-expanded branch pile machine and construction method of cut-expanded branch pile

Abstract

The invention discloses a rotary cut-expanded branch pile machine and a construction method of a cut-expanded branch pile. The cut-expanded branch pile comprises a drill rod, and a rotary cut-expanding assembly is fixed to the drill rod. The rotary cut-expanding assembly comprises a first force transferring barrel, and a plurality of soil cutting steel plates are hinged to the lower end of the first force transferring barrel. First sliding grooves are formed in the inner walls of the soil cutting steel plates. The lower end of a second force transferring barrel stretches inwards to form a pressing block, and a buckle seat is fixed to a connecting barrel. A spring is mounted on the side wall of the buckle seat, the lower end of the spring and the lower end of a mounting groove are fixed, and the upper end of the spring seat and a buckle are fixedly connected. One end of each connecting rod is fixed into the corresponding first sliding groove, and the other ends of the connecting rods are mounted on the buckle. When the drill bit reaches a target position, the soil cutting steel plates work under the action of a hydraulic component, the rotary speed and angles of the soil cutting steel plates achieve stepless speed change, and finally a tree-shaped branch plate cavity is formed in the same position. Compared with a common branch pile, the formed tree-shaped branch pile has the advantages that the size is larger, and the vertical and transverse axial bearing capacity of a pile foundation is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of forming poured branch piles, and in particular relates to a rotary cutting and expanding branch pile machine and a construction method of cutting and expanding branch piles. Background technique [0002] Support disc pile is a new type of pile foundation technology. By squeezing and expanding in a suitable soil layer, a cast-in-place pile with a support disc is formed, which greatly improves the bearing capacity of a single pile, reduces the pile diameter and pile length, saves costs, and shortens the construction period. , has been widely used in many cities. [0003] Disc piles are ordinary friction piles or friction end-bearing piles in relatively weak soil layers, which can increase the bearing capacity of pile ends by setting bearing plates or bearing branches within a limited range of pile body soil layers, and make full use of all areas within the pile body. The bearing capacity of the pile end of...

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Problems solved by technology

[0004] At present, there are the following disadvantages in the actual use of ordinary support disc piles: 1) only one disc is formed at the same position, and its lateral area increment is small, which cannot well improve the lateral and axial bearing capacity of the pile foundation; 2) the construction quality is not easy to control, It is more difficult to construct in hard soil layers; 3) The construction efficiency is low and the construction time is relatively long

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