Casing drilling tool and rotary drilling rig
A tubular drill and drilling tool technology, which is applied in the field of tubular drill and rotary drilling rig, can solve the problems of poor consistency of the diameter of cast-in-situ piles, over-square, inability to achieve divided soil fetching, and cycle operations, etc., to improve Effects of construction quality and construction efficiency, reduction of frictional resistance, and reduction of engineering super square phenomenon
Pending Publication Date: 2020-09-25
BEIJING SANY INTELLIGENT MFG TECH CO LTD
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Problems solved by technology
During the construction of the long casing, due to the difference in diameter between the upper casing and the drilling tool, the diameter of the cast-in-situ pile is poorly consistent, and there are often over-square phenomena in the project, and it is impossible to achieve divided soil and cycle operations
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[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.
[0028] Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art wi...
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The embodiment of the invention provides a casing drilling tool and a rotary drilling rig, and relates to the technical field of rotary drilling rigs. The casing drilling tool comprises a drilling tool body, a main shaft, a first rotary cutting plate and a second rotary cutting plate, wherein the main shaft is arranged on the drilling tool body and used for installing a drill bit, the first rotarycutting plate and the second rotary cutting plate are centrosymmetric with respect to the main shaft, the first rotary cutting plate and the second rotary cutting plate rotate in the first directionso as to enable the first rotary cutting plate and the second rotary cutting plate to be exposed to the outer side of a pile casing, and the first rotary cutting plate and the second rotary cutting plate rotate in the second direction so as to enable the first rotary cutting plate and the second rotary cutting plate to retract to the inner side of the pile casing. The casing drilling tool can achieve reaming drilling, reduce the frictional resistance in the lowering process of the pile casing, reduce the phenomenon of square exceeding of a project, and achieve graded soil sampling and circulating operation.
Description
technical field [0001] The invention relates to the technical field of rotary drilling rigs, in particular to a tubular drilling tool and a rotary drilling rig. Background technique [0002] Rotary drilling rigs need to use different drilling tools and construction methods for different geological conditions. In the silty clay that is easy to shrink the neck and the loose mixed fill stratum and sand stratum that are easy to collapse holes and the seriously permeable stratum, a long casing or a full casing must be used to protect the wall. During the construction of the long casing, due to the different hole diameters of the upper casing and the drilling tool, the diameter of the cast-in-place piles is not consistent from top to bottom, and there are often oversquare phenomena in the project, and it is impossible to achieve soil fetching and cycle operations. Contents of the invention [0003] The purpose of the present invention includes, for example, to provide a follow-...
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IPC IPC(8): E21B10/43E21B12/04E21B10/32
CPCE21B10/43E21B12/04E21B10/32
Inventor 余超马宁刘一柱
Owner BEIJING SANY INTELLIGENT MFG TECH CO LTD