CN106948762B - CFG reducing back taper stepped pile, preparation method and drilling tool - Google Patents
CFG reducing back taper stepped pile, preparation method and drilling tool Download PDFInfo
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- CN106948762B CN106948762B CN201710333352.2A CN201710333352A CN106948762B CN 106948762 B CN106948762 B CN 106948762B CN 201710333352 A CN201710333352 A CN 201710333352A CN 106948762 B CN106948762 B CN 106948762B
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- 238000005553 drilling Methods 0.000 title claims abstract description 197
- 238000002360 preparation method Methods 0.000 title abstract description 6
- 239000002689 soil Substances 0.000 claims abstract description 11
- 230000001681 protective effect Effects 0.000 claims description 20
- 239000004567 concrete Substances 0.000 claims description 19
- 230000000670 limiting effect Effects 0.000 claims description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 5
- 238000013459 approach Methods 0.000 claims description 3
- 230000006835 compression Effects 0.000 abstract description 3
- 238000007906 compression Methods 0.000 abstract description 3
- 238000010276 construction Methods 0.000 description 5
- 239000011150 reinforced concrete Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- E21B7/28—Enlarging drilled holes, e.g. by counterboring
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/48—Piles varying in construction along their length, i.e. along the body between head and shoe, e.g. made of different materials along their length
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/22—Rods or pipes with helical structure
-
- 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
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
-
- 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
- E21B3/00—Rotary drilling
-
- 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
- E21B3/00—Rotary drilling
- E21B3/02—Surface drives for rotary drilling
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
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- General Engineering & Computer Science (AREA)
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Abstract
The invention relates to the technical field of buildings, in particular to a CFG reducing back taper stepped pile, a preparation method and a drilling tool. The drilling tool comprises: an outer sleeve drilling tool, a middle sleeve drilling tool and a center drilling tool which are coaxially sleeved in sequence; the central drilling tool is provided with a first linkage device; the middle sleeve drilling tool is provided with a second linkage device; the outer sleeve drilling tool is provided with a third linkage device; each linkage device on the drilling tool is overlapped and sleeved, and the linkage device is matched with an auxiliary equipment winch to finally form the CFG reducing inverted cone stepped pile. The CFG reducing back taper stepped pile bearing capacity not only has pile side friction and pile end bearing capacity of the traditional pile body, but also can decompose partial vertical downward force into tangential force and normal force of a conical surface by the back taper disk inclined surface of the back taper stepped body, the pile surrounding soil forms a passive compression stress state and a squeezing and expanding state, the pile surrounding friction is increased, the bearing capacity of a single pile is comprehensively improved, and the settlement is reduced.
Description
Technical Field
The invention relates to the technical field of buildings, in particular to a CFG reducing back taper stepped pile, a preparation method and a drilling tool.
Background
In the wave tide of reform opening, the construction industry has been rapidly developed, the design and construction requirements of the construction engineering on the foundation are higher and higher, the concrete pile and the reinforced concrete pile are widely applied in the engineering of high-rise buildings, bridges, ports and the like, and the shapes of the concrete pile and the reinforced concrete pile are changed in order to enable the concrete pile and the reinforced concrete pile to meet the design requirements of bending resistance, shearing resistance, bearing capacity improvement, earthquake resistance requirement and the like. Not only can meet the design requirement and save the consumption of raw materials, but also can improve the engineering quality and shorten the construction progress.
The vertical and horizontal section of the traditional pile built by the existing equipment is a round or square pile which does not change along with the length of the pile, and the bearing capacity of the pile is mainly composed of friction resistance on the pile side and end bearing capacity of the pile end.
Disclosure of Invention
The invention aims to provide a CFG reducing back taper stepped pile, a preparation method and a drilling tool, and aims to solve the technical problems that a traditional pile type constructed by existing equipment is single in structural form and low in bearing capacity.
To solve the above technical problem, in a first aspect, the present invention provides a drilling tool, which includes: an outer sleeve drilling tool, a middle sleeve drilling tool and a center drilling tool which are coaxially sleeved in sequence; the central drilling tool is provided with a first linkage device; the middle sleeve drilling tool is provided with a second linkage device; the outer sleeve drilling tool is provided with a third linkage device; when the outer sleeve drilling tool is lifted upwards, the third linkage device can be sleeved and locked on the second linkage device, and the second linkage device can be sleeved and locked on the first linkage device.
Further, the center drilling tool includes: the drill comprises a hollow drill rod, an openable drill bit and a first helical blade; the first helical blade is arranged on the outer wall of the hollow drill rod along the axial direction of the hollow drill rod, the drill bit is connected to the lower end of the hollow drill rod, the first linkage device is coaxially arranged at the upper end of the hollow drill rod, and a first flange plate is arranged on the first linkage device.
Further, the intermediate sleeve drilling tool comprises: the device comprises a first sleeve drilling tool and a second helical blade, wherein the second helical blade is arranged on the outer wall of the first sleeve drilling tool along the axial direction of the first sleeve drilling tool, a plurality of soil discharging holes are formed in the first sleeve drilling tool, the second linkage device is coaxially arranged at the upper end of the first sleeve drilling tool, and a second flange plate is arranged at the upper end of the second linkage device.
Further, the outer sleeve drilling tool comprises: the device comprises a second sleeve drilling tool, a third helical blade and a protective barrel, wherein the third helical blade is arranged on the outer wall of the second sleeve drilling tool along the axial direction of the second sleeve drilling tool, a plurality of soil discharging holes are formed in the second sleeve drilling tool, a third linkage device is arranged at the upper end of the second sleeve drilling tool, the protective barrel is arranged at the upper end of the outer sleeve drilling tool, a spring device used for being connected with a winch steel wire rope is arranged on the protective barrel, a limiting device is arranged on the spring device, and a third flange plate is arranged at the upper end of the third linkage device.
Further, the first linkage device comprises a first square cylinder, wherein the first square cylinder is coaxially provided with a first sleeve hole with a circular cross section, and the first sleeve hole is used for being fixed at the upper end of the central drilling tool;
the second linkage device comprises a second square cylinder, and a second sleeve hole with a square cross section is coaxially arranged on the second square cylinder and is used for being sleeved into the first linkage device;
the third linkage device comprises a cylinder, and a third sleeve hole with a square cross section is coaxially arranged on the cylinder and is used for being sleeved into the second linkage device.
In order to solve the technical problem, in a second aspect, the invention further provides a CFG reducing back taper stepped pile prepared according to the drilling tool, which comprises a main pile body, wherein at least two back taper stepped bodies are arranged on the main pile body.
Further, the cross section of the inverted cone step-shaped body is round, and the longitudinal section of the inverted cone step-shaped body is inverted trapezoid.
Further, the angle range of the inclined plane extension line of the inverted conical disk of the inverted conical step-shaped body and the central axis of the pile body of the main body is preferably: 30-45 degrees.
In order to solve the technical problem, in a third aspect, the present invention also provides a method for preparing a CFG reducing back taper stepped pile according to the drilling tool, which comprises the following steps:
the central drilling tool is rotated clockwise/anticlockwise by a power device and simultaneously moves downwards;
when the first linkage device of the central drilling tool approaches to the second linkage device of the middle sleeve drilling tool, the outer sleeve drilling tool is lifted by an auxiliary equipment winch, the third linkage device of the outer sleeve drilling tool is sleeved and locked on the second linkage device of the middle sleeve drilling tool, then the middle sleeve drilling tool is driven to synchronously lift, and the second linkage device of the middle sleeve drilling tool is finally sleeved and locked on the first linkage device of the central drilling tool, and at the moment, all the linkage devices are mutually locked;
each drilling tool is rotated clockwise/anticlockwise simultaneously by a power device and moves downwards;
when each drilling tool drills to the designed depth, stopping rotating, lifting the central drilling tool by the main winch of the drilling machine, opening the drill bit at the lower end of the central drilling tool, starting a concrete pump, starting to press and fill concrete, lifting the central drilling tool while pressing and filling the concrete, and then sequentially lifting the middle sleeve drilling tool and the outer sleeve drilling tool until the outer sleeve drilling tool lifts the hole elevation, and simultaneously pressing and filling the concrete to the designed elevation.
Further, when the auxiliary equipment winch lifts the outer sleeve drilling tool, the auxiliary equipment winch comprises the following steps:
a protective cylinder is arranged on the outer sleeve drilling tool, a spring device is arranged on the protective cylinder, an auxiliary equipment winch is connected with the protective cylinder through a steel wire rope and the spring device, and the elasticity of the spring device is utilized to enable a third linkage device of the outer sleeve drilling tool to automatically pass through and be sleeved on a second linkage device of the middle sleeve drilling tool; the second linkage device of the middle sleeve drilling tool can be automatically sleeved on the first linkage device of the center drilling tool by utilizing the elasticity of the spring device in the same way, and a limiting device is arranged on the spring device and used for controlling auxiliary equipment windlass to stop working when the deformation of the spring device reaches the preset length.
By adopting the technical scheme, the invention has the following beneficial effects:
the invention provides a drilling tool, wherein each linkage device on the drilling tool is overlapped and sleeved and matched with an auxiliary equipment winch, so that a plurality of back taper step-shaped drilling holes can be formed, the drilling tool is sequentially lifted, and meanwhile, concrete is pressed and poured, so that a CFG reducing back taper step-shaped pile is realized.
The invention provides a CFG variable-diameter back taper stepped pile, which has the bearing capacity of not only having pile side friction and pile end bearing capacity of a traditional pile body, but also decomposing partial vertical downward force into tangential force and normal force of a conical surface by a back taper disk inclined surface of the back taper stepped body, wherein the pile periphery soil forms a passive compression stress state and a squeezing and expanding state, the pile periphery friction is increased, the bearing capacity of a single pile is comprehensively improved, and the settlement is reduced. The structure changes function and the bearing capacity of the pile can be calculated by using a foundation bearing capacity formula of a Taisha foundation (Terzagh i).
The invention provides a preparation method, which combines a drilling tool with an auxiliary equipment winch to form the CFG reducing back taper stepped pile with the structure and the function.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will briefly explain the drawings needed in the embodiments or the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of the drilling tool of the present invention in an initial state;
FIG. 2 is a schematic view of the drilling tool of the present invention in a lifted state;
FIG. 3 is a schematic view of the center drilling tool of the present invention;
FIG. 4 is a schematic view of a first linkage of the present invention;
FIG. 5 is a schematic view of the middle sleeve drilling tool of the present invention;
FIG. 6 is a schematic structural view of a second linkage of the present invention;
FIG. 7 is a schematic view of the outer sleeve drilling tool of the present invention;
FIG. 8 is a schematic structural view of a third linkage device according to the present invention;
FIG. 9 is a schematic structural view of a CFG reducing back taper stepped pile of the present invention;
fig. 10 to 16 are schematic views showing construction steps of the drilling tool of the present invention.
In the figure, 1 is a winch, 2 is a steel wire rope, 3 is a central drilling tool, 31 is a first flange plate, 32 is a first linkage device, 33 is a hollow drilling rod, 34 is a first helical blade, 35 is a drilling bit, 4 is an intermediate sleeve drilling tool, 41 is a second flange plate, 42 is a second linkage device, 43 is a first sleeve drilling tool, 44 is a second helical blade, 45 is a soil drilling and discharging hole, 5 is an outer sleeve drilling tool, 51 is a third flange plate, 52 is a third linkage device, 53 is a second sleeve drilling tool, 54 is a third helical blade, 55 is a soil drilling and discharging hole, 56 is a pile casing, 71 is a main pile body, and 72 is a back taper step type body; and 8 is a concrete pump.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The following describes specific embodiments of the present invention in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
Example 1
As shown in fig. 1 to 2, the present embodiment provides a drilling tool, which includes: an outer sleeve drilling tool 5, a middle sleeve drilling tool 4 and a center drilling tool 3 which are coaxially sleeved in sequence; the center drilling tool 3 is provided with a first linkage 32; the intermediate sleeve drilling tool 4 is provided with a second linkage 42; the outer sleeve drilling tool 5 is provided with a third linkage device 52; the third linkage 52 can be sleeved and locked on the second linkage 42 when the outer sleeve drilling tool 5 is lifted upwards, and the second linkage 42 can be sleeved and locked on the first linkage 32.
Therefore, in this embodiment, each linkage device of the drilling tool is overlapped, and each linkage device on the drilling tool can be matched with the auxiliary equipment winch 1, so that a plurality of back taper stepped drilled holes can be formed, and the drilling tool is sequentially lifted and simultaneously pressed and poured with concrete, so that a CFG reducing back taper stepped pile can be realized.
As shown in fig. 3 to 4, the center drilling tool 3 in this embodiment includes: a hollow drill stem 33, a retractable drill bit 35 and a first helical blade 34; the first helical blade 34 is disposed on the outer wall of the hollow drill rod 33 along the axial direction of the hollow drill rod 33, the drill bit 35 is connected to the lower end of the hollow drill rod 33, the first linkage 32 is coaxially disposed on the upper end of the hollow drill rod 33, and the first flange 31 is disposed on the first linkage 32.
As shown in fig. 5 to 6, the intermediate sleeve drilling tool 4 in this embodiment includes: the first sleeve drilling tool 43 and the second helical blade 44, the second helical blade 44 along the axial direction of the first sleeve drilling tool 43 set up on the outer wall of the first sleeve drilling tool 43, be provided with a plurality of soil discharging holes 45 on the first sleeve drilling tool 43, the second aggregate unit 42 coaxial set up in the upper end of the first sleeve drilling tool 43 be provided with the second ring flange 41 in the upper end of the second aggregate unit 42.
It should be noted that the intermediate sleeve drilling tool 4 may be composed of a plurality of stacked sleeves according to design requirements. When the middle sleeve drilling tool 4 is sleeved by a plurality of overlapped sleeves, the structures are the same except that the diameters and the lengths of the sleeves are different.
Referring to fig. 7 to 8, the outer sleeve drilling tool 5 of the present embodiment includes: the second sleeve drilling tool 53, the third helical blade 54 and the protective cylinder 56, the third helical blade 54 is arranged on the outer wall of the second sleeve drilling tool 53 along the axial direction of the second sleeve drilling tool 53, a plurality of soil discharging holes 55 are formed in the second sleeve drilling tool 53, the third linkage device 52 is arranged on the inner side of the upper end of the second sleeve drilling tool 53, the protective cylinder 56 is arranged on the outer side of the upper end of the second sleeve drilling tool 53, a spring device used for being connected with a steel wire rope 2 of the winch 1 is arranged on the protective cylinder 56, a limiting device is arranged on the spring device, and the elastic device stretches or compresses to a certain extent to enable auxiliary equipment winch 1 to stop working, and the limiting device achieves automatic stop action. A third flange 51 is provided at the upper end of the third linkage 52.
It should be noted that the first helical blade 34, the second helical blade 44, and the third helical blade 54 may be either a positive helical or a negative helical type, and are not limited herein.
The geometry of the linkage device in the embodiment can be flexibly set according to actual needs, and the following preferred mode is exemplified:
the first linkage device 32 comprises a first square cylinder, and the first square cylinder is coaxially provided with a first sleeve hole with a circular cross section, and the first sleeve hole is used for being fixed at the upper end of the hollow drill rod 33; the second linkage 42 comprises a second square cylinder coaxially provided with a second sleeve hole with a square cross section for sleeving the first linkage 32; the third linkage 52 comprises a cylinder coaxially provided with a third set of bores of square cross-section for nesting the second linkage 42.
Wherein, be provided with the ring flange that the diameter is greater than square column type cross section diagonal its function on the aggregate unit upper end of each drilling tool: causing the corresponding linkages to interlock in place; the vertical pressure of the central drilling tool 3 is transferred to the other sleeve drilling tools.
In summary, the drilling tool in this embodiment may be used in combination with auxiliary equipment, which is composed of a hoist 1, a wire rope 2, and a casing 56. The connection and combination of the drilling tool are mainly realized by an unlocking linkage device on the drilling tool. Specifically, a hoist 1 is provided at the lower end of the drill power head, and the hoist 1 is connected to a vertically sliding casing 56 via a wire rope 2. The auxiliary device provides services for linkage interaction. Auxiliary equipment and a linkage device enable the multi-sleeve drilling tool to form a hole into a plurality of back taper step type drilling holes, and the drilling tools are sequentially lifted to simultaneously press and fill concrete, so that the CFG reducing back taper step type pile is realized.
Example two
Referring to fig. 9, the second embodiment further provides a CFG variable diameter back taper stepped pile prepared by the drilling tool according to the first embodiment, which includes a main pile body 71, and at least two back taper stepped bodies 72 are disposed on the main pile body 71. Preferably, the cross-section of each segment on body pile 71 varies continuously from top to bottom.
Further, the cross section of the inverted cone step-shaped body 72 is circular, and the longitudinal section is inverted trapezoid. The inverted conical disk slope of the inverted conical stepped profile 72 breaks down a portion of the vertical, vertical downward force into tangential and normal forces of the conical surface.
Wherein, the included angle between the side surface of the main pile body 71 and the horizontal plane is slightly smaller than or equal to 90 degrees.
Preferably, the angle range between the inclined plane extension line of the inverted conical disk of the inverted conical stepped profile 72 and the central axis of the pile body of the main body is preferably: 30-45 degrees.
Preferably, the pile body 71 can be inserted with a reinforcement cage according to design requirements.
In summary, the CFG reducing back taper stepped pile provided in this embodiment includes a main pile body 71, at least two back taper stepped bodies 72 are provided on the main pile body 71, the bearing capacity of the pile body not only has pile side friction force and pile end bearing capacity of the traditional pile body, but also the back taper circular disc inclined surface of the back taper stepped bodies 72 can decompose partial vertical downward force into tangential force and normal force of the conical surface, the pile surrounding soil forms passive compression stress state and extrusion expansion state, the pile surrounding friction force is increased, the bearing capacity of a single pile is comprehensively improved, and the settlement is reduced.
Example III
As shown in fig. 10 to 16, the third embodiment also provides a method for preparing a CFG reducing back taper stepped pile by using the drilling tool according to the first embodiment, which includes the following steps:
the center drilling tool 3 is rotated clockwise/counterclockwise by a power means (e.g., a power motor) while being moved downward;
when the first linkage device 32 of the central drilling tool 3 approaches the second linkage device 42 of the middle sleeve drilling tool 4, the auxiliary equipment winch 1 lifts the outer sleeve drilling tool 5 (specifically, the winch 1 lifts the protective sleeve 56 through the steel wire rope 2, the protective sleeve 56 drives the outer sleeve drilling tool 5 to lift), the third linkage device 52 of the outer sleeve drilling tool 5 is sleeved and locked on the second linkage device 42 of the middle sleeve drilling tool 4, and then drives the middle sleeve drilling tool 4 to synchronously lift, and the second linkage device 42 of the middle sleeve drilling tool 4 is finally sleeved and locked on the first linkage device 32 of the central drilling tool 3, wherein the linkage devices are mutually locked (the interlocking in the middle can be at least understood as radial limiting, and the corresponding limiting effect is realized under the action of the winch 1 in the axial direction of course);
each drilling tool is simultaneously rotated clockwise/anticlockwise and moved downwards by a power device (such as a power motor);
when each drilling tool drills to the designed depth, stopping rotating, lifting the central drilling tool 3 by the main winch of the drilling machine, opening a drill bit 35 at the lower end of the central drilling tool 3 (exposing a discharge hole), starting a concrete pump 8, starting to press and fill concrete, lifting the central drilling tool 3 while pressing and filling the concrete, and then sequentially lifting the middle sleeve drilling tool 4 and the outer sleeve drilling tool 5 (wherein the transverse cross section size of the drill bit 35 is slightly larger than the lower opening size of the middle sleeve drilling tool 4, the last layer of helical blade at the lower end of the equal-diameter helical blade of the middle sleeve drilling tool 4 is omitted, the transverse cross section size is slightly larger than the sleeve opening inner diameter of the outer sleeve drilling tool 5) until the outer sleeve drilling tool 5 lifts the hole elevation, and simultaneously pressing and filling the concrete to the designed elevation.
Further, the auxiliary equipment winch 1 lifts the outer sleeve drilling tool 5, comprising the following steps: a protective cylinder 56 is arranged on the outer sleeve drilling tool 5, a spring device is arranged on the protective cylinder 56, the auxiliary equipment winch 1 is connected with the protective cylinder 56 through a steel wire rope 2 and the spring device, and the third linkage device 52 of the outer sleeve drilling tool 5 can automatically penetrate through the second linkage device 42 of the middle sleeve drilling tool 4 by utilizing the elasticity of the spring device; the second linkage device of the middle sleeve drilling tool can automatically pass through the first linkage device of the center drilling tool by using the elasticity of the spring device. And a limiting device is arranged on the spring device, and when the deformation amount of the spring device reaches a preset length, the limiting device controls the auxiliary equipment winch 1 to stop working.
Principle of setting the back taper step profile 72: two or more inverted cone step shapes 72 may be provided when a formation having a stable structure, a small compressibility, a high bearing capacity, and a large layer thickness is present at the upper portion (above the ground water level) within the pile foundation or foundation treatment range.
Note that: in the process of lifting the drilling tool by the main winch of the drilling machine, the auxiliary equipment winch 1 is correspondingly matched. When the number of the middle sleeve drilling tools 4 is large, the linkage devices can be overlapped and interlocked in place, so that the inverted ladder-shaped multi-step inverted cone stepped pile is formed.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (4)
1. A drilling tool, comprising: an outer sleeve drilling tool, a middle sleeve drilling tool and a center drilling tool which are coaxially sleeved in sequence; the central drilling tool is provided with a first linkage device; the middle sleeve drilling tool is provided with a second linkage device; the outer sleeve drilling tool is provided with a third linkage device; when the outer sleeve drilling tool is lifted upwards, the third linkage device can be sleeved and locked on the second linkage device, and the second linkage device can be sleeved and locked on the first linkage device;
the center drilling tool includes: the drill comprises a hollow drill rod, an openable drill bit and a first helical blade; the first helical blade is arranged on the outer wall of the hollow drill rod along the axial direction of the hollow drill rod, the drill bit is connected to the lower end of the hollow drill rod, the first linkage device is coaxially arranged at the upper end of the hollow drill rod, and a first flange plate is arranged on the first linkage device;
the intermediate sleeve drilling tool comprises: the first sleeve drilling tool is provided with a plurality of soil discharging holes, the second linkage device is coaxially arranged at the upper end of the first sleeve drilling tool, and the upper end of the second linkage device is provided with a second flange plate;
the outer sleeve drilling tool comprises: the device comprises a second sleeve drilling tool, a third helical blade and a protective barrel, wherein the third helical blade is arranged on the outer wall of the second sleeve drilling tool along the axial direction of the second sleeve drilling tool, a plurality of soil discharging holes are formed in the second sleeve drilling tool, a third linkage device is arranged at the upper end of the second sleeve drilling tool, the protective barrel is arranged at the upper end of the outer sleeve drilling tool, a spring device used for being connected with a winch steel wire rope is arranged on the protective barrel, a limiting device is arranged on the spring device, and a third flange plate is arranged at the upper end of the third linkage device.
2. The drilling tool of claim 1, wherein the drill tool comprises a drill bit,
the first linkage device comprises a first square cylinder, a first sleeve hole with a circular cross section is coaxially arranged in the first square cylinder, and the first sleeve hole is used for being fixed at the upper end of the central drilling tool;
the second linkage device comprises a second square cylinder, and a second sleeve hole with a square cross section is coaxially arranged on the second square cylinder and is used for being sleeved into the first linkage device;
the third linkage device comprises a cylinder, and a third sleeve hole with a square cross section is coaxially arranged on the cylinder and is used for being sleeved into the second linkage device.
3. A method of preparing a CFG reducing back taper stepped pile with a drilling tool according to claim 1 or 2, comprising the steps of:
the central drilling tool is rotated clockwise/anticlockwise by a power device and simultaneously moves downwards;
when the first linkage device of the central drilling tool approaches to the second linkage device of the middle sleeve drilling tool, the outer sleeve drilling tool is lifted by an auxiliary equipment winch, the third linkage device of the outer sleeve drilling tool is sleeved and locked on the second linkage device of the middle sleeve drilling tool, then the middle sleeve drilling tool is driven to synchronously lift, and the second linkage device of the middle sleeve drilling tool is finally sleeved and locked on the first linkage device of the central drilling tool, and at the moment, all the linkage devices are mutually locked;
each drilling tool is rotated clockwise/anticlockwise simultaneously by a power device and moves downwards;
when each drilling tool drills to the designed depth, stopping rotating, lifting the central drilling tool by the main winch of the drilling machine, opening the drill bit at the lower end of the central drilling tool, starting a concrete pump, starting to press and fill concrete, lifting the central drilling tool while pressing and filling the concrete, and then sequentially lifting the middle sleeve drilling tool and the outer sleeve drilling tool until the outer sleeve drilling tool lifts the hole elevation, and simultaneously pressing and filling the concrete to the designed elevation.
4. A method of preparing a CFG reducing back taper stepped pile according to claim 3, wherein the auxiliary equipment hoist lifts the outer sleeve drilling tool, comprising the steps of:
a protective cylinder is arranged on the outer sleeve drilling tool, a spring device is arranged on the protective cylinder, an auxiliary equipment winch is connected with the protective cylinder through a steel wire rope and the spring device, and the elasticity of the spring device is utilized to enable a third linkage device of the outer sleeve drilling tool to automatically pass through and be sleeved on a second linkage device of the middle sleeve drilling tool; the second linkage device of the middle sleeve drilling tool can be automatically sleeved on the first linkage device of the center drilling tool by utilizing the elasticity of the spring device in the same way, and a limiting device is arranged on the spring device and used for controlling auxiliary equipment windlass to stop working when the deformation of the spring device reaches the preset length.
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| CN108035341A (en) * | 2018-01-24 | 2018-05-15 | 李广信 | Extruding and removing soil complex superposition is nested drilling tool, the back taper stepped ramp type stake of CFG reducings and method |
| CN109098655B (en) * | 2018-10-11 | 2024-02-06 | 李广信 | Multi-power composite drilling tool, preparation method and pile |
| CN109025809B (en) * | 2018-10-11 | 2024-02-06 | 李广信 | Multi-power guide linkage composite drilling tool, preparation method and pile type |
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Application publication date: 20170714 Assignee: Hebei cone base civil engineering Co.,Ltd. Assignor: Li Guangxin Contract record no.: 2018990000103 Denomination of invention: CFG variable diameter inverted cone step type pile, preparation method and drilling tool License type: Exclusive License Record date: 20180419 |
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