A high-efficiency rotary drilling bit device for large cross-section caissons combined with drilling and stirring
A technology of large cross-section and drill bit, which is applied to the drilling driving device, drilling equipment, drill pipe and other directions in the wellbore, can solve the problems of low mud suction efficiency, difficulty in discharging the mud of drilling slag, low drilling efficiency and safety, etc. , to achieve the effect of enhancing the stirring effect, speeding up the mixing and formation, and improving the efficiency of mud discharge
Active Publication Date: 2020-12-01
ZHEJIANG UNIV
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[0029] During the drilling process, the main drill bit 1 first penetrates into the soil, and the four cutting edges 3 continue to cut the underwater silt and soft soil after the main drill bit 1 penetrates into the soil. The hollow main drill rod 14 drives the driving gear 11 to rotate, The transmission between the gears is used to provide power for the four auxiliary drill bits 4, so that the main drill bit 1 and the auxiliary drill bit 4 can cut the silt at the same time without increasing the power source, which greatly increases the forming range of one drilling and doubles The drilling efficiency is greatly improved; at the same time, the relative rotation between the cutting edge of the main drill bit 1 and the cutting edge of the auxiliary drill bit 4 can greatly enhance the stirring effect on the mud, so that the mud and water generated by drilling can be more fully mixed to form mud. Through the negative pressure in the mud suction port 5 and the hollow main drill pipe...
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Disclosed is an efficient rotary drilling drill bit device with combined drilling and stirring for a large-section open caisson. The rotary drilling drill bit device comprises a gear transmission box (10), a driving gear (11), driven gears (9), a hollow primary drill rod (14), secondary drill rods (6), a primary drill bit (1), and secondary drill bits (4), wherein four secondary drill bits (4) are uniformly arranged above the primary drill bit (1) in the circumferential direction; a positioning plate (13) which is fixedly connected to the hollow primary drill rod (14) is respectively mounted on and under a box body such that the gear transmission box (10) can move synchronously with the increase in the drilling depth; the shape of the gear transmission box (10) is composed of a square and circles, the vertexes of the square acting as the center of the circles; the gear transmission box (10) is internally provided with the driving gear (11) and the driven gears (9), the driving gear (11) is fixedly connected to the hollow primary drill rod (14) via a key (15) and synchronously rotates along with the primary drill bit (1) during the drilling process; and each of the four driven gears (9) meshes with the driving gear (11) and respectively drives, by means of the key (15), one of the secondary drill bits (4) to rotate. By means of the device, the drilling efficiency and the mud discharging efficiency are improved, and a mud suction pipe being blocked and drill bit silting and even breaking caused by unsmooth mud discharging during the drilling process are prevented.
Description
technical field [0001] The invention is a large-scale hydraulic reverse circulation drilling rig used in the field of bridge construction, and in particular relates to a high-efficiency rotary drilling drill bit device for large cross-section caissons combined with drilling and stirring. Background technique [0002] The bored pile construction method is widely used in the construction of bridges and wharfs. The current drilling rig equipment can be divided into positive circulation drilling rigs, reverse circulation drilling rigs, submersible drilling rigs, rotary drilling rigs, impact drilling rigs, etc. according to the hole forming process. Reverse circulation drilling rigs have the advantages of fast drilling speed, high construction efficiency, and smooth discharge of drilling slag when drilling into mudstone formations, so they are widely used. [0003] During the construction of bridge mid-tower caissons, the common main soil layers are silt and silty clay, whose mai...
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IPC IPC(8): E21B4/16E21B17/00E21B10/43E21B12/00
CPCE21B4/16E21B10/43E21B12/00E21B17/00
Inventor 伊国栋张绍举晋哲楠张树有
Owner ZHEJIANG UNIV