CN112012658B - Ultra-deep large-diameter bored pile hole forming method - Google Patents
Ultra-deep large-diameter bored pile hole forming method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000005553 drilling Methods 0.000 claims abstract description 81
- 239000002002 slurry Substances 0.000 claims abstract description 29
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 24
- 239000010959 steel Substances 0.000 claims abstract description 24
- 238000001514 detection method Methods 0.000 claims abstract description 8
- 238000010009 beating Methods 0.000 claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- 238000010276 construction Methods 0.000 claims description 16
- 238000005086 pumping Methods 0.000 claims description 15
- 229910000278 bentonite Inorganic materials 0.000 claims description 9
- 239000000440 bentonite Substances 0.000 claims description 9
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 9
- 238000004062 sedimentation Methods 0.000 claims description 7
- 230000001681 protective effect Effects 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 3
- 239000000084 colloidal system Substances 0.000 claims description 3
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims description 3
- 238000009775 high-speed stirring Methods 0.000 claims description 3
- 230000007062 hydrolysis Effects 0.000 claims description 3
- 238000006460 hydrolysis reaction Methods 0.000 claims description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 3
- 239000011707 mineral Substances 0.000 claims description 3
- 229910052901 montmorillonite Inorganic materials 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 230000003301 hydrolyzing effect Effects 0.000 claims 1
- 239000011148 porous material Substances 0.000 abstract description 2
- 238000011065 in-situ storage Methods 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 238000010079 rubber tapping Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/12—Underwater drilling
- E21B7/136—Underwater drilling from non-buoyant support
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/06—Arrangements for treating drilling fluids outside the borehole
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/16—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using gaseous fluids
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/043—Directional drilling for underwater installations
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/28—Enlarging drilled holes, e.g. by counterboring
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Geophysics (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to a hole forming method for an ultra-deep large-diameter bored pile, which is characterized by comprising the following steps of: firstly, manufacturing a guide frame of a pile casing; secondly, positioning a guide frame of the pile casing; thirdly, inserting and beating a steel casing; fourthly, placing a hole drilling machine in place; fifthly, arranging a slurry circulating system and preparing slurry; sixthly, opening holes; seventhly, performing primary hole expansion; eighthly, secondary hole expanding; ninthly, carrying out three-stage hole expansion; and step ten, pore-forming detection. The invention can complete the pore-forming of the large-diameter ultra-deep bored pile without a special drilling machine for the ultra-deep large-diameter bored pile, has high pore-forming precision and short pore period, can ensure safety and reduce cost.
Description
Technical Field
The invention relates to bridge engineering, in particular to a hole forming method for an ultra-deep large-diameter bored pile.
Background
The design and construction level of the large-diameter cast-in-situ bored pile of the bridge in China are in the front international level. For large bridge engineering, cast-in-situ bored piles are generally used as a preferred foundation form. At present, the recorded maximum diameter of the cast-in-situ bored pile in China is a Wuhan Tianxing Zhou bridge, the length of the pile is 76m, the diameter of the pile reaches 3.4m, and the pile is a rock-socketed pile. The maximum pile length of a single pile is the North navigation bridge of the Hangzhou Bay sea-crossing bridge, the pile length of the single pile exceeds 125m, the pile diameter is 2.8m, and the single pile is a friction pile. At present, only a KTY-3000 gas lift reverse circulation drilling machine of the medium and high speed railway bridge office can drill in place at one time in China, and the conventional single drilling equipment and construction method can not meet the pile hole forming construction requirement at all. Therefore, the hole forming construction task of the ultra-deep large-diameter bored pile can be efficiently and safely finished by selecting reasonable equipment and a reasonable construction method.
CN 104047543A discloses "a construction method of major diameter bored pile pore-forming in high strength rock stratum", through adopting the method of coring many times, use the drill bit of different diameters, core many times to high strength rock stratum, the construction of finally accomplishing bored pile embedding rock part drilling, the effectual prior art low in construction efficiency that has solved, the big problem of vibrations interference has improved the pore-forming quality simultaneously, has reduced construction risk etc. has that the construction speed is fast, environmental impact is little, characteristics that economic benefits is high. This is a useful attempt in the art.
Disclosure of Invention
The invention aims to provide a method for forming a hole in an ultra-deep large-diameter bored pile, which can complete the hole forming of the large-diameter ultra-deep bored pile without a special drilling machine for the ultra-deep large-diameter bored pile, has high hole forming precision and short hole forming period, can ensure safety and reduce cost.
The invention relates to a hole forming method for an ultra-deep large-diameter bored pile, which is characterized by comprising the following steps of:
firstly, manufacturing a guide frame of a pile casing;
the pile casing guide frame adopts a double-layer frame type structure, and a connecting system, an upright post and a guide support of the pile casing guide frame are respectively made of double-spliced 20a, 25a and 40a channel steel;
secondly, positioning a guide frame of the pile casing;
the protective cylinder guide frame is hoisted to a drilling platform by using a 60t gantry crane for positioning;
thirdly, inserting and beating a steel casing;
firstly, rolling a 16mm steel plate field into a section of steel casing with the thickness of 8m, then conveying the steel casing to a drilling platform by using a flat car for positioning, then hoisting a hydraulic vibration hammer with the brand name of Yong' an YZ-300 to the upper part of a casing guide frame by using a 60t gantry crane, and inserting and beating the steel casing until the steel casing is inserted into a riverbed;
fourthly, placing a hole drilling machine in place;
the tapping drill selects a pumping reverse circulation drill with the brand number of ZSD3000, a 60t gantry crane is used for moving the parallel hydraulic vibration hammer away, and the pumping reverse circulation drill is hoisted to the upper part of the protective cylinder guide frame by the 60t gantry crane;
fifthly, arranging a slurry circulating system and preparing slurry;
the mud circulating system comprises a mud pool and a sedimentation pool communicated with the mud pool, the mud pool is communicated with a mud inlet of the pumping reverse circulation drilling machine, and a mud outlet of the pumping reverse circulation drilling machine is communicated with the sedimentation pool; and two slurries were prepared: one is a base pulp without PHP, and the other is a new pulp containing PHP; the base slurry adopts bentonite taking montmorillonite as a main mineral substance as a raw material for preparing the slurry, and construction water is taken from Huaihe river according to the following ratio: bentonite: NA2CO3= 300: 18.2: 1 (mass ratio). Bentonite and water can not be mixed into slurry in a natural state, and slurry colloid can be formed only by high-speed stirring through a high-speed stirrer; the new pulp is prepared by taking non-instant hydrolysis type PAM with the molecular weight of 1200 ten thousand as a raw material according to the formula of PAM: NAOH: H2O = 10: 1.0: 612 (mass ratio) to form PHP solution; adding 0.6kg of PHP solution into each cubic meter of base slurry to prepare PHP fresh slurry;
sixthly, drilling holes
The hole is opened by using a three-wing conical drill bit with the diameter of 1.0m, and the three-wing conical drill bit is arranged on a pump-pumping reverse circulation drilling machine; measuring and positioning the drilling machine, adjusting the horizontal position of the drilling machine and the centering of the drill bit, and rechecking the position deviation of the plane of the drill bit; drilling at a low speed at a drilling speed of 3m/h after the drill bit is started, accelerating to a drilling speed of 6-15 m/h after the drill bit completely enters a river bed, drilling at a high speed, and stopping after the drill bit is drilled to a hole depth of 90 m;
seventhly, performing primary hole expansion;
a gas lift reverse circulation drilling machine is selected for primary reaming, and a four-wing conical drill bit with the diameter of 1.8m is selected as a drill bit; moving the pump suction reverse circulation drilling machine to another hole site, then moving the gas lift reverse circulation drilling machine to the hole site needing hole expansion, adjusting the drilling machine to be horizontal, centering the drill bit, performing primary hole expansion operation, and stopping drilling until the hole depth reaches 121 m;
eighthly, secondary hole expansion;
the secondary reaming is carried out by a gas-lift reverse circulation drilling machine, and a four-wing conical drill bit with the diameter of 2.2m is selected as a secondary reaming drill bit; firstly, lifting a four-wing conical drill bit with the diameter of 1.8m, then replacing the four-wing conical drill bit with a secondary hole expanding drill bit with the diameter of 2.2m to perform secondary hole expanding operation, and stopping drilling until the hole depth reaches 121 m;
ninthly, carrying out three-stage hole expansion;
the third-stage hole expanding is realized by a gas-lift reverse circulation drilling machine, and a four-wing conical drill bit with the diameter of 2.5m is selected as a third-stage hole expanding drill bit; lifting a secondary hole expanding drill bit with the diameter of 2.2m, replacing the secondary hole expanding drill bit with a tertiary hole expanding drill bit with the diameter of 2.5m to perform tertiary hole expanding operation, and stopping drilling until the hole depth reaches 121 m;
tenth, detecting the formed holes;
after the three-stage reaming operation is finished, performing pore-forming detection; the pore-forming detection adopts a measuring rope ruler and an aperture tester with the model number of RSM-HGT (B) to detect the central position, the depth, the aperture and the inclination of the pore-forming.
The invention has the beneficial effects that:
the invention adopts a ZSD3000 type pump-pumping reverse circulation drilling machine and a GF-300 gas-lift reverse circulation drilling machine to drill and enlarge holes in a graded manner, successfully realizes the hole forming of the large-diameter ultra-deep drilling pile with the diameter of 2.5m, the pile length of 96m and the hole depth of about 121m under the condition of no special drilling machine for the ultra-deep large-diameter drilling pile, the hole forming gradient of all the drilling piles is less than 1 percent, the hole site deviation is less than 100mm, the whole hole forming period is finished 15 days earlier than the original fixed period, and the cost is saved by 180 ten thousand yuan compared with the rented KTY-3000 gas-lift reverse circulation drilling machine. By adopting the construction method, on the premise of ensuring the construction quality safety, a large amount of materials and manpower are saved, the cost is reduced, the safety guarantee is provided for the construction of the bridge substructure, and good social benefits are obtained.
Drawings
FIG. 1 is a schematic structural view of a guide frame of the pile casing;
FIG. 2 is a schematic view of the positioning of the guide frame of the casing;
FIG. 3 is a schematic illustration of a plunge steel casing;
FIG. 4 is a schematic illustration of a mud circulation system in connection with a pumped reverse circulation rig;
FIG. 5 is a schematic illustration of a drill opening using a pumping reverse circulation drill;
FIG. 6 is a schematic illustration of a primary reaming operation using a gas lift reverse circulation drill;
FIG. 7 is a schematic illustration of a two stage reaming process using a gas lift reverse circulation drill;
FIG. 8 is a schematic illustration of three stage reaming with a gas lift reverse circulation drill;
FIG. 9 is a schematic view of pore formation detection.
In the figure: the method comprises the following steps of 1-protecting cylinder guide frame, 2-60 t gantry crane, 3-drilling platform, 4-steel protecting cylinder, 5-hydraulic vibration hammer, 6-mud pit, 7-sedimentation pit, 8-pump suction reverse circulation drilling machine, 9-three-wing conical drill bit, 10-gas lift reverse circulation drilling machine, 11-four-wing conical drill bit, 12-second-stage expanding drill bit, 13-third-stage expanding drill bit, 14-rope measuring ruler and 15-aperture tester.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
Referring to fig. 1 to 9, the method for forming a hole in an ultra-deep large-diameter bored pile is characterized by comprising the following steps:
firstly, manufacturing a guide frame of a pile casing;
the pile casing guide frame 1 adopts a double-layer frame type structure, and a connecting system, an upright post and a guide support of the pile casing guide frame 1 are respectively made of double-spliced 20a, 25a and 40a channel steel;
secondly, positioning a guide frame of the pile casing;
the protective cylinder guide frame 1 is hoisted to a drilling platform 3 by a 60t gantry crane 2 for positioning;
thirdly, inserting and beating a steel casing;
firstly, rolling a 16mm steel plate field into a section of steel casing with the thickness of 8m, then transporting the steel casing 4 to a drilling platform 3 by using a flat car for positioning, then hoisting a hydraulic vibration hammer 5 with the brand name of Yongan YZ-300 to the upper part of a casing guide frame 1 by using a 60t gantry crane 2, and inserting and beating the steel casing 4 until the steel casing is inserted into a riverbed;
fourthly, placing a hole drilling machine in place;
the tapping drill selects a pumping reverse circulation drill 8 with the brand number of ZSD3000, firstly a 60t gantry crane 2 is used for moving away a hydraulic vibration hammer 5, and then the 60t gantry crane 2 is used for hoisting the pumping reverse circulation drill 8 to the upper part of the protective cylinder guide frame 1;
fifthly, arranging a slurry circulating system and preparing slurry;
the mud circulating system comprises a mud pool 6 and a sedimentation pool 7 communicated with the mud pool, the mud pool 6 is communicated with a mud inlet of a pumping reverse circulation drilling machine 8, and a mud outlet of the pumping reverse circulation drilling machine 8 is communicated with the sedimentation pool (7); preparing slurry;
sixthly, opening holes;
the three-wing conical drill bit 9 with the diameter of 1.0m is adopted for opening the hole, and the three-wing conical drill bit 9 is firstly arranged on a pump suction reverse circulation drilling machine 8; measuring and positioning the drilling machine, adjusting the horizontal position of the drilling machine and centering the drill bit, and rechecking the plane position deviation of the drill bit by using a pile protection (using a reference pile arranged by measurement for rapidly rechecking the pile position); drilling at a low speed after the drill is started, accelerating after the drill bit completely enters a riverbed, and stopping drilling until the hole depth reaches 90 m;
seventhly, performing primary hole expansion;
a gas lift reverse circulation drilling machine 10 is selected for primary reaming, and a four-wing conical drill bit 11 with the diameter of 1.8m is selected as a drill bit; moving the pump pumping reverse circulation drilling machine 8 to another hole site for hole opening, then moving the gas lift reverse circulation drilling machine 10 to a hole site needing hole expansion, adjusting the drilling machine to be horizontal, centering a drill bit, performing primary hole expansion operation, and drilling until the hole depth reaches 121 m;
eighthly, secondary hole expanding;
the secondary reaming is carried out by a gas-lift reverse circulation drilling machine 10, and a four-wing conical drill bit with the diameter of 2.2m is selected as a secondary reaming drill bit 12; firstly, lifting a four-wing conical drill bit 11 with the diameter of 1.8m, then replacing the four-wing conical drill bit with a secondary hole expanding drill bit 12 with the diameter of 2.2m to perform secondary hole expanding operation, and stopping drilling until the hole depth reaches 121 m;
ninthly, carrying out three-stage hole expansion;
the third-stage hole expanding is carried out by a gas-lift reverse circulation drilling machine 10, and a four-wing conical drill bit with the diameter of 2.5m is selected as a third-stage hole expanding drill bit 13; lifting a secondary hole expanding drill bit 12 with the diameter of 2.2m, replacing the secondary hole expanding drill bit with a tertiary hole expanding drill bit 13 with the diameter of 2.5m to perform tertiary hole expanding operation, and stopping drilling until the hole depth reaches 121 m;
tenth, detecting the formed holes;
after the three-stage reaming operation is finished, performing pore-forming detection; the hole forming detection adopts a measuring rope ruler 14 and an aperture tester 15 with the mark of RSM-HGT (B) to detect the center position, the depth, the aperture and the gradient of the formed hole.
In the fifth step, two slurries are prepared: one is a base pulp without PHP, and the other is a new pulp containing PHP; the base slurry adopts bentonite taking montmorillonite as a main mineral substance as a raw material for preparing the slurry, and construction water is taken from Huaihe river according to the following ratio: bentonite: NA2CO3= 300: 18.2: 1 (mass ratio); bentonite and water can not be mixed into slurry in a natural state, and slurry colloid can be formed only by high-speed stirring through a high-speed stirrer; the new pulp is prepared by taking non-instant hydrolysis type PAM with the molecular weight of 1200 ten thousand as a raw material according to the formula of PAM: NAOH: H2O = 10: 1.0: 612 (mass ratio) to form PHP solution; adding 0.6kg of PHP solution into each cubic meter of base pulp to prepare PHP fresh mud.
Claims (2)
1. A hole forming method for an ultra-deep large-diameter bored pile is characterized by comprising the following steps:
firstly, manufacturing a guide frame of a pile casing;
the pile casing guide frame (1) adopts a double-layer frame type structure, and a connecting system, an upright post and a guide support of the pile casing guide frame (1) are respectively made of double-spliced 20a, 25a and 40a channel steel;
secondly, positioning a guide frame of the pile casing;
the protective cylinder guide frame (1) is hoisted to the drilling platform (3) by using a 60t gantry crane (2) for positioning;
thirdly, inserting and beating a steel casing;
firstly, rolling a 16mm steel plate field into a section of steel casing with the thickness of 8m, then transporting the steel casing (4) to a drilling platform (3) by using a flat car for positioning, then hoisting a hydraulic vibration hammer (5) to the upper part of a casing guide frame (1) by using a 60t gantry crane (2), and inserting and beating the steel casing (4) until the steel casing is inserted into a riverbed;
fourthly, positioning a hole drilling machine;
a pump suction reverse circulation drilling machine (8) is selected as the hole drilling machine, a 60t gantry crane (2) is used for moving the parallel hydraulic vibration hammer (5) away, and the pump suction reverse circulation drilling machine (8) is hung above the protective cylinder guide frame (1) by the 60t gantry crane (2);
fifthly, arranging a slurry circulating system and preparing slurry;
the mud circulating system comprises a mud pool (6) and a sedimentation pool (7) communicated with the mud pool, the mud pool (6) is communicated with a mud inlet of the pumping reverse circulation drilling machine (8), and a mud outlet of the pumping reverse circulation drilling machine (8) is communicated with the sedimentation pool (7); preparing slurry;
sixthly, opening holes;
the three-wing conical drill bit (9) with the diameter of 1.0m is adopted for opening the hole, and the three-wing conical drill bit (9) is firstly arranged on a pump-pumping reverse circulation drilling machine (8); measuring and positioning the drilling machine, adjusting the horizontal position of the drilling machine and the centering of the drill bit, and rechecking the position deviation of the plane of the drill bit; drilling at a low speed at a drilling speed of 3m/h after the drill bit is started, accelerating to a drilling speed of 6-15 m/h after the drill bit completely enters a river bed, drilling at a high speed, and stopping after the drill bit is drilled to a hole depth of 90 m;
seventhly, performing primary hole expansion;
a gas lift reverse circulation drilling machine (10) is selected for primary reaming, and a four-wing conical drill bit (11) with the diameter of 1.8m is selected for the drill bit; moving the pump suction reverse circulation drilling machine (8) to another hole site, then moving the gas lift reverse circulation drilling machine (10) to the hole site needing hole expansion, adjusting the drilling machine to be horizontal, centering the drill bit, performing first-stage hole expansion operation, and stopping drilling until the depth of the hole reaches 121 m;
eighthly, secondary hole expanding;
the secondary reaming is carried out by a gas-lift reverse circulation drilling machine (10), and a four-wing conical drill bit with the diameter of 2.2m is selected as a secondary reaming drill bit (12); lifting a four-wing conical drill bit (11) with the diameter of 1.8m, then replacing the four-wing conical drill bit with a secondary hole expanding drill bit (12) with the diameter of 2.2m to perform secondary hole expanding operation, and stopping drilling until the hole depth reaches 121 m;
ninthly, carrying out three-stage hole expansion;
the third-stage hole expanding is carried out by a gas-lift reverse circulation drilling machine (10), and a four-wing conical drill bit with the diameter of 2.5m is selected as a third-stage hole expanding drill bit (13); firstly, lifting a secondary hole expanding drill bit (12) with the diameter of 2.2m, then replacing the secondary hole expanding drill bit with a tertiary hole expanding drill bit (13) with the diameter of 2.5m to carry out tertiary hole expanding operation, and stopping drilling until the hole depth reaches 121 m;
tenth, detecting the formed holes;
after the three-stage reaming operation is finished, performing pore-forming detection; the pore-forming detection adopts a rope measuring ruler (14) and an aperture tester (15) to detect the central position, the depth, the aperture and the gradient of pore-forming.
2. The method for forming a hole in an ultra-deep large-diameter bored pile according to claim 1, wherein: two kinds of slurry need to be prepared in the slurry of the slurry circulating system: one is a base pulp without PHP, and the other is a new pulp containing PHP; the base slurry adopts bentonite taking montmorillonite as a main mineral substance as a raw material for preparing the slurry, and construction water is taken from Huaihe river according to the following ratio: bentonite: the mass ratio of NA2CO3 is 300: 18.2: 1, preparing; bentonite and water can not be mixed into slurry in a natural state, and slurry colloid can be formed only by high-speed stirring through a high-speed stirrer; the new pulp is prepared by taking non-instant hydrolysis type PAM with the molecular weight of 1200 ten thousand as a raw material according to the formula of PAM: NAOH: the mass ratio of H2O is 10: 1.0: 612 hydrolyzing to PHP solution; adding 0.6kg of PHP solution into each cubic meter of base pulp to prepare PHP fresh mud.
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| AU553268B2 (en) * | 1982-02-22 | 1986-07-10 | Turkmensky Nauchno-Issledovatelsky Geologorazvedochny Institut | Drilling fluid circulation |
| CN100572683C (en) * | 2008-03-04 | 2009-12-23 | 中国建筑第六工程局有限公司 | The large-diameter ultra-deep rock borehole bottom-expanding filling pile job practices |
| CN104295239A (en) * | 2014-09-29 | 2015-01-21 | 中铁建设投资集团有限公司 | Method for using rotary drilling rig to drill into hard rock stratum |
| CN108060894A (en) * | 2017-12-12 | 2018-05-22 | 中交公局第二工程有限公司 | A kind of boring method under complex geological condition |
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