Drill rod pilot device

Abstract

The invention relates to a drill rod pilot device. The device comprises a pilot steel ring, wherein the diameter of the pilot steel ring is slightly smaller than the diameter of a drill bit, fixed joints are coaxially arranged above and below the pilot steel ring, and the fixed joints are used for being coaxially fixed on a drill rod; a plurality of hinge lugs I which are uniformly distributed arearranged on the outer periphery of each fixed joint, an upper group of hinge lugs II and a lower group of hinge lugs II are arranged on the inner periphery of the pilot steel ring, and the number ofeach group of hinge lugs II and the number of hinge lugs I on each fixed joint are equal; and the device further comprises a plurality of connecting steel plates, wherein the first ends of the connecting steel plates are hinged to the hinge lugs I, the second ends of the connecting steel plates are hinged to the hinge lugs II, and the hinge structures are hinged modes which are convenient to disassemble and assemble. When in use, the pilot steel ring is coaxial with the drill bit, the pilot device is driven into a hole along with the drill rod, a certain distance is provided between the pilotsteel ring and the drill bit, when the drill bit drives the drill rod to deflect, the pilot steel ring makes contact with the hole wall, the deflection of the drill rod is forced to be controlled, andthus the purpose of pilot is achieved, the defect that an active pilot device occupies the space of the hole mouth platform is overcome, the structure is simple, and the disassembly and assembly areconvenient.

Description

technical field [0001] The invention relates to the technical field of bored pile engineering, in particular to a drill pipe guiding device. Background technique [0002] Bored cast-in-situ pile refers to a pile formed by mechanically drilling a pile hole in the foundation soil at the engineering site, placing a steel cage in it, and pouring concrete into it. It is a pile defined according to the pile-forming method. pile type. [0003] Bored cast-in-place piles first appeared in the United States in the early 1940s with the successful development of high-power drilling tools. The application of bored piles in my country began in the early 1960s and was first used in bridge and port construction. Today, with the rapid development of science and technology, bored piles are widely used in high-rise, super high-rise buildings and heavy structures, and their design and construction levels have been greatly developed. [0004] Bored piles have the advantages of little harm to th...

AI Technical Summary

Problems solved by technology

[0005] The construction of bored piles has two types of mud retaining method and full casing construction method due to the different formation of the selected retaining wall. Rotary drilling rig and submersible drilling rig are two commonly used construction equipment for mud retaining bored piles. Rotary drilling rig or When the submersible drilling rig is drilling, it mainly relies on the drill bit to guide and control the verticality deviation of the pile hole. However, due to the limited steering ability of the drill bit, the pile hole is prone to deflection. When the deflection is large, the reinforcement cage cannot be placed in place. , in severe cases, even the catheter cannot be lowered, resulting in quality problems or quality accidents

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