CN108035341A - Extruding and removing soil complex superposition is nested drilling tool, the back taper stepped ramp type stake of CFG reducings and method - Google Patents
Extruding and removing soil complex superposition is nested drilling tool, the back taper stepped ramp type stake of CFG reducings and method Download PDFInfo
- Publication number
- CN108035341A CN108035341A CN201810069522.5A CN201810069522A CN108035341A CN 108035341 A CN108035341 A CN 108035341A CN 201810069522 A CN201810069522 A CN 201810069522A CN 108035341 A CN108035341 A CN 108035341A
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- drilling tool
- linkage
- tool
- soil
- soil compaction
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Classifications
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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
- E02D5/36—Concrete or concrete-like piles cast in position ; Apparatus for making same making without use of mouldpipes or other moulds
-
- 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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 DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
Abstract
The present invention relates to technical field of buildings, it is nested drilling tool, the back taper stepped ramp type stake of CFG reducings and method more particularly, to a kind of extruding and removing soil complex superposition.The drilling tool includes：Outer sleeve drilling tool, intermediate sleeve drilling tool and the center drilling tool being sequentially coaxially arranged, each drilling tool are respectively provided with crowded, casting complex function；Each linkage of the drilling tool for superposition phase shell type, by being engaged with ancillary equipment hoisting mechanism, can finally be formed a kind of extruding and removing soil complex superposition be nested drilling tool preparation CFG reducing back taper stepped ramp type stakes.Therefore the optimization of pile-type, the improvement of drilling tool function, the comprehensive three high features for embodying engineering method：High quality, high speed, high benefit.Energy saving, emission reduction green construction engineering method makes enterprise be benefited, and owner is benefited, and society is benefited.
Description
Technical field
The present invention relates to technical field of buildings, fallen more particularly, to a kind of be nested drilling tool, CFG reducings of extruding and removing soil complex superposition
Bore stepped ramp type stake and method.
Background technology
Existing pile-type defect：In the tide of reform and opening-up, construction industry has rapid development, and architectural engineering is to foundation
Design, construction requirement it is higher and higher, concrete stake and reinforced concrete pile basis and composite foundation in works such as skyscraper, bridge, harbours
It is used widely in journey, in order to make concrete stake and reinforced concrete pile meets bending resistance, anti-shearing, improves bearing capacity and shockproof requirements etc. and set
Meter requires, and people are constantly improved the shape of concrete stake and reinforced concrete pile.To further meet design requirement, former material is saved
Expect dosage, improve construction quality and shorten construction speed.The traditional pile-type built with existing equipment and technique, its vertical and horizontal section lead to
It is often circle or barrette that be not long with stake and changing, its bearing capacity is mainly by the frictional resistance of stake side and the end resistance group at stake end
Into.
Existing engineering method defect：, it is necessary to carry out the ground of disposal field soil in building structure or railway, highway soft foundation processing
Soil from shallow to deep according to mean shear wave velocity value changing rule can generally be divided into Soft site soil, in soft Site Soil, in hard field
Ground soil, hard ground soil.It is (weak that soil compaction area can simply be divided into foundation soil according to the soft or hard degree of Site Soil and soil depth
Site Soil, in soft Site Soil, wherein water content is higher or saturation cohesive soil except)；Casting area (Moderate stiff soil sites soil, hard ground
Outside earth removal).
To improve the bearing capacity of foundation soil and improving the compression modulus of ground, generally take based on pile body displacement foundation soil
Long screw auger pressure deposited pile-CFG pile work methods.A kind of new engineering method-screw rod pile is developed again in recent years, which is to pass through improvement
Equipment, increase dead weight, increase actuating unit kinetic energy, are allowed to drilling tool moment of torsion and become larger.Using synchronous skill when drilling tool pore-forming, the pile
Art, during pore-forming based on soil compaction, creeps into and soil compaction is to after projected depth, reversal synchronization technology carry brill at the same time pressure concrete injecting pile to setting
Absolute altitude is counted, therefore amount of being unearthed is seldom, has encrypted soil around pile.
The above two engineering method bearing capacity for adding foundation soil all different degrees of in suitable stratum.But for complexity
Foundation soil, drilling tool function used in two kinds of engineering methods is more single, shallow-layer can soil compaction area, CFG pile work methods can only letter
Soil singly is replaced, causes the reduction of soil around pile side friction；In the harder casting area of deep layer, the further high torque of screw rod pile work method
Go squeezed, cause drilling difficult, influence work efficiency, such as to closely knit sandy soil, attempt it is squeezed it, its structural strength can be destroyed, very
Swollen to cutting, side friction and end resistance reduce on the contrary.The single-function of two kinds of engineering methods, it is impossible to adaptation to local conditions Ground Treatment
Soil, causes certain cost and wastes, and have impact on bearing capacity of single pile and plays effect.
The content of the invention
It is compound folded it is an object of the invention to provide a kind of CFG reducings back taper stepped ramp type stake and preparation method and extruding and removing soil
Add the drilling tool that is nested, the disadvantage of bad adaptability single to solve the engineering method of existing equipment, to solve cost waste, bearing capacity of single pile
Not high technical problem.
In order to solve the above technical problems, the drilling tool in a first aspect, a kind of extruding and removing soil complex superposition of present invention offer is nested, it is wrapped
Include：Outer sleeve drilling tool, intermediate sleeve drilling tool and the center drilling tool being sequentially coaxially arranged；
Wherein, at least one has crowded, casting by one among the outer sleeve drilling tool, intermediate sleeve drilling tool and center drilling tool
The tool body of complex function is formed；The outside diameter of the core pipe of the tool body gradually increases from bottom to top, and according to predetermined
Soil compaction ratio be changed；The soil compaction ratio is defined as core pipe overall diameter and tool body diameter ratio；The drilling tool master
The width of the helical blade of body is gradually reduced from bottom to top, so that the outer contour of all helical blades is distributed in equal diameter；
The center drilling tool is provided with the first linkage；The intermediate sleeve drilling tool is provided with the second linkage；Institute
State outer sleeve drilling tool and be provided with the 3rd linkage；When the outer sleeve drilling tool is moving upward, the 3rd linkage
It can be arranged and be locked on second linkage, second linkage can be arranged and be locked in described first
On dynamic device.
As a kind of further technical solution, the center drilling tool includes：Hollow drill, retractable drill bit and first
Helical blade；First helical blade is axially set on the outer wall of the hollow drill along the hollow drill, described
Drill bit is connected to the lower end of the hollow drill, and first linkage is coaxially disposed in the upper end of the hollow drill,
First flange disk is provided with first linkage；
Wherein, centered on the top of the hollow drill drilling tool soil compaction drilling tool, centered on the lower part of the hollow drill
The casting drilling tool of drilling tool；The soil compaction of the soil compaction drilling tool than number range in 0.6-1.0, the soil compaction ratio of the soil compaction drilling tool
Gradually ascending gradual change from the bottom to top；
Wherein, the soil compaction of the casting drilling tool than number range be less than 0.6；Wherein, the soil compaction ratio of the casting drilling tool
Gradual ascending gradual change from the bottom to top is certain value.
As a kind of further technical solution, the intermediate sleeve drilling tool includes：First sleeve drilling tool and second spiral
Blade, second helical blade are axially set on the outer wall of the first sleeve drilling tool along the first sleeve drilling tool,
Second linkage is coaxially disposed in the upper end of the first sleeve drilling tool, is set in the upper end of second linkage
There is second flange disk, wherein, the first sleeve drilling tool uses soil compaction ratio to be not less than 0.6 and the drilling tool master based on soil compaction
Body.
As a kind of further technical solution, the outer sleeve drilling tool includes：Second sleeve drilling tool, the 3rd helical blade
And casing, the outer wall that is axially set in the second sleeve drilling tool of the 3rd helical blade along the second sleeve drilling tool
On, the 3rd linkage is arranged at the upper end of the second sleeve drilling tool, and the casing is arranged at the outer sleeve drilling tool
Upper end, and the spring assembly for being connected with hoisting mechanism steel wire rope is provided with the casing, in the described 3rd linkage dress
The upper end put is provided with the 3rd ring flange.Wherein, the second sleeve drilling tool use soil compaction ratio not less than 0.6 and using soil compaction as
Main tool body.
As a kind of further technical solution, first linkage includes the first cubic cylinder, and the described 1st
It is circular first sets of holes that square body, which is coaxially arranged with section, and first sets of holes are used to be fixed on the center drilling tool
End；
Second linkage includes the second cubic cylinder, and it is square that the described second cubic cylinder, which is coaxially arranged with section,
The second sets of holes, second sets of holes be used for be inserted in first linkage；
3rd linkage includes cylinder, and it is the 3rd square sets of holes that the cylinder, which is coaxially arranged with section,
3rd sets of holes are used to be inserted in second linkage.
In order to solve the above technical problems, second aspect, the present invention provides a kind of extruding and removing soil complex superposition and is nested drilling tool
The CFG reducing back taper stepped ramp type stakes of preparation, it is characterised in that including main body pile body, at least two are provided with the main body pile body
A back taper stepped ramp type body, the main body pile body can be inserted with steel reinforcement cage according in design requirement pile body.
As a kind of further technical solution, the cross section of the back taper stepped ramp type body is circle, and vertical section is terraced to fall
Type；The inverted cone disk inclined-plane extended line and the angle angular range of main body pile body central axis of the back taper stepped ramp type body be：300
~450。
In order to solve the above technical problems, the third aspect, the present invention provides a kind of extruding and removing soil complex superposition and is nested brill
Has the method to prepare CFG reducing back taper stepped ramp type stakes, it is characterised in that include the following steps：
Center drilling tool clockwise/counterclockwise is rotated by power set, is moved down at the same time；
First linkage of center drilling tool close to intermediate sleeve drilling tool the second linkage when, lifted by ancillary equipment
Mechanism lifts outer sleeve drilling tool and intermediate sleeve drilling tool, make them be contacted with each drilling tool linkage, each linkage leads to
Center drilling tool rotation, the default stress automatic lifting action of hoisting mechanism are crossed, realizes and is superimposed the locking that is nested automatically, so that each
Dynamic device locks mutually；
Making each drilling tool by power set, clockwise/counterclockwise rotates at the same time, and moves down；
When each drilling tool is drilled into respective projected depth, stop operating, drilling machine master winch lifting center drilling tool, by center drilling tool
Lower end drill bit open, start concrete pump, start pressure concrete injecting, lifting center drilling tool, lifts intermediate sleeve successively afterwards in pressure concrete injecting
Cylinder drilling tool, outer sleeve drilling tool, until outer sleeve drilling tool is mentioned into aperture absolute altitude, while concrete also presses and fills pile to designed elevation.
Include as a kind of further technical solution, during the ancillary equipment lift mechanism lifts outer sleeve drilling tool as follows
Step：
One casing is installed on outer sleeve drilling tool, spring assembly is provided with casing, ancillary equipment hoisting mechanism leads to
Cross steel wire rope, spring assembly and casing to connect, preset the action of stress automatic lifting using hoisting mechanism, drilling tool is rotated and matched somebody with somebody at center
Under conjunction, make the first linkage of the 3rd linkage of outer sleeve drilling tool, the second linkage of intermediate sleeve drilling tool, center drilling tool
Device is superimposed the locking that is nested automatically；And realize that hoisting mechanism presets stress by preset function on hoisting mechanism, pass through steel
Cord, spring assembly realize that each linkage is superimposed the automatic work for the locking that is nested automatically.
Using above-mentioned technical proposal, the present invention has the advantages that：
It is nested drilling tool the present invention provides a kind of extruding and removing soil complex superposition, each linkage on the drilling tool is superposition phase
Shell type, is engaged with ancillary equipment hoisting mechanism, so as to form multiple back taper stepped ramp type drillings, lifts drilling tool at the same time successively
Pressure concrete injecting is achieved a kind of CFG reducings back taper stepped ramp type stake.
It is nested brill the present invention provides a kind of CFG reducings back taper stepped ramp type stake and preparation method and extruding and removing soil complex superposition
Tool, its bearing capacity not only include the pile side friction and stake end bottom bearing of traditional pile body, and the back taper circle of back taper stepped ramp type body
Disk inclined-plane, can be decomposed into the vertical power vertically downwards in part the tangential force and normal force of the conical surface, and soil around pile forms passive compression
Stress state and squeezed state, add pile perimeter resistance, improve the bearing capacity of single pile, can reduce settling amount.This frustum
The shallow water oil field formula of part bearing capacity Ke Yong Tai Shaji (Terzaghi) calculates.The present invention is bored to solve tradition at the same time
Tool single-function caused by harmful effect and propose, and it is an object of the present invention to provide it is a kind of for compound foundation pile squeeze, casting it is multiple
Bench drill has.Be nested combination construction by combination drill tool superposition, soil compaction, casting at the same time all into, and can disposably complete pore-forming and
Concrete pressure fills pile, realizes the raising of work efficiency, bearing capacity of single pile further improves, while reduces cost, shortens work
Phase.
The present invention provides a kind of preparation method, this method is by the way that extruding and removing soil complex superposition is nested drilling tool and ancillary equipment
Hoisting mechanism is combined, so as to form the CFG reducing back taper stepped ramp type stakes with said structure sum.
Brief description of the drawings
, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution of the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, in describing below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
Put, other attached drawings can also be obtained according to these attached drawings.
Fig. 1 a, Fig. 1 b are the structure diagram that two types drilling tool of the present invention is in original state；
Fig. 2 a, Fig. 2 b are the structure diagram that two types drilling tool of the present invention is in lifting state；
Fig. 3 a, Fig. 3 b are the structure diagram of two types center of the present invention drilling tool；
Fig. 4 is the structure diagram of the first linkage of the invention；
Fig. 5 a, Fig. 5 b are the structure diagram of two types intermediate sleeve drilling tool of the present invention；
Fig. 6 is the structure diagram of the second linkage of the invention；
Fig. 7 a, Fig. 7 b are the structure diagram of two types outer sleeve drilling tool of the present invention；
Fig. 8 is the structure diagram of the 3rd linkage of the invention；
Fig. 9 a, Fig. 9 b are the structure diagram of two types CFG reducings back taper stepped ramp type stake of the present invention；
Figure 10 a to Figure 10 g and Figure 11 a to Figure 11 h are the construction procedure schematic diagram of two kinds of difference in functionality drilling tools of the invention.
In figure, 1 is hoisting mechanism, and 2 be steel wire rope, and drilling tool centered on 3,31 be first flange disk, and 32 fill for the first linkage
Put, 33 be hollow drill, and 34 be the first helical blade, and 35 be drill bit, and 4 be intermediate sleeve drilling tool, and 41 be second flange disk, 42
It is the first sleeve drilling tool for the second linkage, 43,44 be the second helical blade, and 45 be earth discharging hole, and 46 is bore tooth, and 5 be outer
Sleeve drilling tool, 51 be the 3rd ring flange, and 52 be the 3rd linkage, and 53 be second sleeve drilling tool, and 54 be the 3rd helical blade, 55
For earth discharging hole, 56 is bore tooth, and 57 be casing, and 71 be main body pile body, and 72 be back taper stepped ramp type body；8 pump for concrete.
Embodiment
Technical scheme is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's all other embodiments obtained without making creative work, belong to the scope of protection of the invention.
The embodiment of the present invention is described in detail below in conjunction with attached drawing.It should be appreciated that this place is retouched
The embodiment stated is merely to illustrate and explain the present invention, and is not intended to limit the invention.
Embodiment one
With reference to shown in Fig. 1 a, Fig. 1 b to Fig. 2 a, Fig. 2 b, the present embodiment provides two kinds of extruding and removing soil complex superposition to be nested
Drilling tool, Fig. 1 a, Fig. 2 a squeeze auxiliary drilling tool for row is main；Fig. 1 b, Fig. 2 b are to squeeze the main auxiliary drilling tool of row.The extruding and removing soil complex superposition is nested drilling tool
It includes：Outer sleeve drilling tool 5, intermediate sleeve drilling tool 4 and the center drilling tool 3 being sequentially coaxially arranged；The center drilling tool 3 is provided with
First linkage 32；The intermediate sleeve drilling tool 4 is provided with the second linkage 42；The outer sleeve drilling tool 5 is provided with
Three linkages 52；When the outer sleeve drilling tool 5 is moving upward, the 3rd linkage 52 can be arranged and be locked in
On second linkage 42, second linkage 42 can be arranged and be locked on first linkage 32；
Wherein, the outer sleeve drilling tool 5, intermediate sleeve drilling tool 4 and center drilling tool 3 at least one of by one have squeeze, casting it is compound
The tool body of function is formed, it is preferred that the outer sleeve drilling tool 5, intermediate sleeve drilling tool 4,3 three of center drilling tool be respectively provided with it is crowded,
Casting complex function, can also outer sleeve drilling tool 5, intermediate sleeve drilling tool 4 have squeeze, casting complex function etc..It is each described
The outside diameter of the core pipe of tool body gradually increases from bottom to top, and is changed according to predetermined soil compaction ratio, the soil compaction ratio
It is defined as core pipe overall diameter and tool body diameter ratio；The width of the helical blade of the tool body from bottom to top by
It is decrescence small, so that the outer contour of all helical blades is in equal diameter distribution (outer profile size its be tool body diameter).It is worth
Illustrate, for the design for the tool body helical blade, those skilled in the art can according to be actually needed into
Row is flexibly set.Wherein, should be interpreted broadly herein.Such as：Squeezed when outer sleeve drilling tool 5, intermediate sleeve drilling tool 4 have, casting
During complex function, the helical blade of corresponding tool body the lowermost frustum structure need not then meet that outer contour is distributed in equal diameter
Rule because this frustum structure can approximation serve as " drill bit " effect use, those are arranged at the spiral shell on " drill bit "
Vane piece according to outer contour in the requirement that equal diameter is distributed without setting.Certainly, frustum structure can meet spiral shell with upper bit
Vane piece outer contour is in the rule of equal diameter distribution.As it can be seen that extruding and removing soil complex superposition is nested each of drilling tool in the present embodiment
Dynamic device is to be superimposed phase shell type, and each linkage on the drilling tool can be engaged with ancillary equipment hoisting mechanism 1, so as to
Multiple back taper stepped ramp type drillings are enough formed, lifting drilling tool successively, pressure concrete injecting is achieved a kind of CFG reducings back taper stepped ramp type at the same time
Stake.
With reference to shown in Fig. 3 a, Fig. 3 b to Fig. 4, Fig. 3 a are casting center drilling tool；Fig. 3 b are to squeeze the auxiliary center drilling tool of main row.This
Center drilling tool described in embodiment 3 includes：Hollow drill 33, retractable 35 and first helical blade 34 of drill bit；Described first
Helical blade 34 is axially set on the outer wall of the hollow drill 33 along the hollow drill 33, and the drill bit 35 connects
In the lower end of the hollow drill 33, first linkage 32 is coaxially disposed in the upper end of the hollow drill 33, in institute
State be provided with the first linkage 32 first flange disk 31 (or first flange disk take suitable size be arranged at linkage with
Drilling tool junction).Wherein, centered on the top of the hollow drill 33 drilling tool soil compaction drilling tool, the lower part of the hollow drill
Centered on drilling tool casting drilling tool；Core pipe overall diameter in the soil compaction drilling tool and tool body diameter ratio from the bottom to top by
Gradual change is big, wherein, define the soil compaction ratio that the ratio is the soil compaction drilling tool, the soil compaction of the soil compaction drilling tool than number range exist
0.6-1.0, the soil compaction of the soil compaction drilling tool is than gradually ascending gradual change from the bottom to top；Outside core pipe in the casting drilling tool
Diameter becomes larger from the bottom to top with tool body diameter ratio, and defines the soil compaction ratio that the ratio is the casting drilling tool, institute
State the soil compaction of casting drilling tool than number range be less than 0.6；Wherein, the casting drilling tool soil compaction than from the bottom to top gradually by
It is small to big gradual change or be certain value (the soil compaction ratio of the casting drilling tool is certain value).
Preferably, specifically, extruding and removing soil combination drill tool main body is made of core pipe, helical blade, drill bit.The drilling tool
The outside diameter of the core pipe of main body gradually increases from bottom to top, and the width of the helical blade of the tool body gradually subtracts from bottom to top
It is small, so that the outer contour of all helical blades is distributed in equal diameter.Drilling tool from bottom to top divides two parts according to function, and lower part is row
Earth boring auger has, and casting drilling tool lower end is equipped with drill bit, and drill bit is responsible for breaking ground, is crept into, and drill bit can be open during pressure concrete injecting；Casting drilling tool is born
Duty：Toward top rotation casting；Casting drilling tool soil compaction ratio is less than 0.6.(soil compaction ratio：Drilling tool core pipe overall diameter and drilling tool diameter it
Than, soil compaction ratio less than 0.6 for casting drilling tool, be soil compaction drilling tool not less than 0.6).Top is soil compaction drilling tool, is responsible for：Rotation
Soil in exclusion pressure, squeezed casting drilling tool rotary row.The gradually ascending gradual change from the bottom to top of soil compaction drilling tool soil compaction ratio, is up to
1.0 (being light bar segment), its prolonged action soil compaction drilling tool, supported hole side wall, prevents hole wall from relaxation effect occur.Helical blade is thick
Degree, intensity, geometry, and spiral shell footpath is than meeting crowded, casting combination drill tool functional requirement.
It is two kinds to select the soil compaction score of extruding and removing soil combination drill tool according to the soft or hard degree of Site Soil：The first, Site Soil with
Based on Moderate stiff soil sites soil, engineering method is used based on casting, the principle supplemented by soil compaction.Combination drill tool matching is based on casting drilling tool
Lead, soil compaction drilling tool coordinates.
For the length of casting drilling tool to handle Moderate stiff soil sites soil thickness, soil compaction ratio preferably selects certain value.The length of soil compaction drilling tool
Degree or soil compaction ratio intensity of variation, depending on to handle it is weak, in soft place soil compactness and drilling machine actuating unit output torque size
Depending on.Drilling tool soil compaction than being light bar segment for 1.0, light bar segment and soil compaction drilling tool have helical blade length itself and should be greater than handling
It is weak, in soft place soil thickness.
Pore-forming is taken to be crept into substitute mode, and casting drilling tool is bored at soil compaction area (Soft site soil, in soft Site Soil) in advance
Into pore-forming, a part of row of piles soil drains into aperture by the rotation of casting drilling tool helical blade, but as soil compaction drilling tool follows up, soil discharge quantity is progressively
Become as low as aperture to be sealed, casting drilling tool helical blade continues toward hole top soil compaction area rotation row soil in Moderate stiff soil sites soil hole at this time.
Soil during soil compaction area rotation row with soil compaction drilling tool helical blade from large to small, SMIC drilling rod overall diameter by it is thin it is thicker during,
By targetedly appropriate extruding, squeezed consumption in (Soft site soil, in soft Site Soil) hole wall, make hole wall side rub uniformly and again
Resistance strengthens.After soil compaction drilling tool, casting drilling tool all reach projected depth, then stop to bore, while the pressure concrete injecting into core pipe, one
Side lifting power machine structure drives combination drill tool Synchronous lifting, until pressure concrete injecting pile to designed elevation.
Crowded, casting combination drill tool is in drilling process, and a part of revolve of stake spoir is invested in drilling rod helical blade after pore-forming, and one
Part rotation row is in aperture side, and a part is extruded, squeezed consumption is in soil compaction area hole wall.
Second, Site Soil with Soft site soil, in based on soft Site Soil, for engineering method all using soil compaction, casting is also crowded
The principle of soil service.Combination drill tool matching is that soil compaction drilling tool is leading, and casting drilling tool coordinates.
For the length of casting drilling tool to handle Moderate stiff soil sites soil thickness, soil compaction ratio preferably selects gradual change value.The length of soil compaction drilling tool
Degree or soil compaction ratio intensity of variation, depending on to handle it is weak, in soft place soil compactness and drilling machine actuating unit output torque size
Depending on.Drilling tool soil compaction than being light bar segment for 1.0, light bar segment and soil compaction drilling tool have helical blade length itself and should be greater than handling
It is weak, in soft place soil thickness.
Pore-forming drilling takes large torque, slowly lower brill mode, drilling tool in advance soil compaction area (Soft site soil, in soft place
Soil) drilling is screwed, drill bit is introduced into before Moderate stiff soil sites soil, and drilling tool rotary is squeezed in soil, and drilling tool periphery soil is extruded, is squeezed, is bored
Have light bar segment access aperture in it is some after, aperture is sealed, aperture cannot be unearthed.Drilling tool rotating speed accelerates at this time, and drill bit breaks ground drilling,
Casting drilling tool rotary casting, while rotation casting is carried out rotation and squeezed by soil compaction drilling tool.After drill bit enters Moderate stiff soil sites soil, casting drilling tool
It is straight to nothing, SMIC drilling rod from large to small with helical blade during rotation is arranged soil in Moderate stiff soil sites soil hole toward hole top rotation row
Footpath by it is thin it is thicker during, rotation casting by uniformly and again targetedly appropriate extruding, squeezed consumption in (Soft site soil, in it is soft
Site Soil) in hole wall, strengthen hole wall side friction.After soil compaction drilling tool, casting drilling tool all reach projected depth, Ran Houting
Bore, while the pressure concrete injecting into core pipe, one side lifting power machine structure drives combination drill tool Synchronous lifting, until pressure concrete injecting pile extremely
Designed elevation.
Crowded, casting combination drill tool is in drilling process, and a part of revolve of stake spoir is invested in drilling rod helical blade after pore-forming, greatly
Part is extruded, squeezed consumption is in hole wall.
With reference to shown in Fig. 5 a, Fig. 5 b to Fig. 6, Fig. 5 a are to squeeze the auxiliary intermediate sleeve drilling tool of main row, its centre drill with casting
Tool combination；Fig. 5 b are to squeeze the auxiliary intermediate sleeve drilling tool of main row, it is with squeezing the main auxiliary center drill assembly of row.In described in the present embodiment
Between sleeve drilling tool 4 include：First sleeve drilling tool 43 and the second helical blade 44, second helical blade 44 is along the first set
Being axially set on the outer wall of the first sleeve drilling tool 43 for cylinder drilling tool 43, is provided with multiple on the first sleeve drilling tool 43
Earth discharging hole 45, (when center drilling tool soil compaction ratio is using soil compaction to be main, does not set earth discharging hole.) second linkage 42 be coaxially disposed in
The upper end of the first sleeve drilling tool 43, second flange disk 41 (or second is provided with the upper end of second linkage 42
Ring flange takes suitable size to be arranged at linkage and sleeve drilling tool junction), wherein, the first sleeve drilling tool is using crowded
Native ratio is not less than 0.6 and the tool body based on soil compaction, it is preferred that the lower end of the first sleeve drilling tool 43 is provided with brill
Tooth 46.
Formed what deserves to be explained is intermediate sleeve drilling tool 4 can be nested according to design requirement by multiple superpositions.Intermediate sleeve bores
When tool 4 is nested by multiple superpositions, in addition to sleeve diameter and length are different, structure all same.
With reference to shown in Fig. 7 a, Fig. 7 b to Fig. 8, Fig. 7 a are to squeeze the auxiliary outer sleeve drilling tool of main row, it and casting center drill set
Close；Fig. 7 b are to squeeze the auxiliary outer sleeve drilling tool of main row, it is with squeezing the main auxiliary center drill assembly of row.Outer sleeve described in the present embodiment bores
Tool 5 includes：Second sleeve drilling tool 53, the 3rd helical blade 54 and casing 57, the 3rd helical blade 54 is along described second set
Being axially set on the outer wall of the second sleeve drilling tool 53 for cylinder drilling tool 53, is provided with multiple on the second sleeve drilling tool 53
Earth discharging hole 55, (center drilling tool soil compaction ratio with squeeze for it is main when, do not set earth discharging hole.) the 3rd linkage 52 is arranged at described
On the inside of the upper end of two sleeve drilling tools 53, the casing 57 is arranged on the outside of the upper end of the second sleeve drilling tool 53, and described
The spring assembly for being connected with 1 steel wire rope 2 of hoisting mechanism is provided with casing 57, passes through preset function reality on hoisting mechanism 1
Existing hoisting mechanism presets stress, realizes that each linkage is superimposed the automatic of locking that be nested automatically by steel wire rope 2, spring assembly
Work.
The 3rd ring flange 51 is provided with the upper end of the 3rd linkage 52, and (or the 3rd ring flange takes suitable size
It is arranged at linkage and sleeve drilling tool junction), outer sleeve drilling tool uses soil compaction ratio crowded based on soil compaction not less than 0.6
Casting combination drill tool.Preferably, it is provided with the lower end of the second sleeve drilling tool 53 and bores tooth 56.
What deserves to be explained is the first helical blade 34, the second helical blade 44 and the 3rd helical blade 54 both can be just
Spirally, or backpitch formula, no longer limits to herein.
The geometry of linkage in the present embodiment can also flexibly be set according to being actually needed, with following a kind of excellent
Mode is selected to illustrate：
First linkage 32 includes the first cubic cylinder, and the described first cubic cylinder is coaxially arranged with section as circle
First sets of holes of shape, first sets of holes are used for the upper end for being fixed on the hollow drill 33；Second linkage 42 wraps
The second cubic cylinder is included, it is the second square sets of holes that the described second cubic cylinder, which is coaxially arranged with section, and second sets of holes are used
In being inserted in first linkage 32；3rd linkage 52 includes cylinder, and the cylinder, which is coaxially arranged with, to be cut
Face is the 3rd square sets of holes, and the 3rd sets of holes are used to be inserted in second linkage 42.
Wherein, the flange that diameter is more than square column type cross section diagonal is provided with the linkage upper end of each drilling tool
Disk.Wherein, or each linkage and (sleeve) drilling tool junction are provided with diameter and are equal to the square column type cross section length of side
Its function of ring flange：Promote corresponding linkage interlocking in place；Drilling tool 3 vertical pressure in center is passed to other sleeves to bore
Tool.Setting the ring flange of each linkage and (sleeve) drilling tool junction also has connection, fixes linkage and (sleeve)
The effect of drilling tool, it is overall to make one.Drilling tool 3 vertical pressure in center is passed into other sleeve drilling tools.
To sum up, the drilling tool in the present embodiment can coordinate ancillary equipment to use, and ancillary equipment is by hoisting mechanism 1, steel wire rope
2nd, casing 57 forms.This kind of drilling tool connection is mainly realized with combining by the linkage that can be unlocked on drilling tool.Specifically, boring
Mechanomotive force head lower end sets hoisting mechanism 1, and hoisting mechanism 1 connects the casing 57 slided up and down by steel wire rope 2.The ancillary equipment
Service is provided for linkage interaction.Ancillary equipment, linkage make it that more sleeve extruding and removing soil complex superpositions are nested drilling tool pore-forming
For the drilling of multiple back taper stepped ramp types, lifting drilling tool successively, pressure concrete injecting is achieved a kind of CFG reducings back taper stepped ramp type stake at the same time.
Embodiment two
With reference to shown in Fig. 9 a, Fig. 9 b, Fig. 9 a pile-type foundation soils based on Moderate stiff soil sites soil, the row of taking is main squeeze auxiliary drilling tool into
Hole；Fig. 9 b pile-type foundation soils with it is weak and in based on soft Site Soil, take the auxiliary drilling tool pore-forming of crowded main row.The present embodiment two is being implemented
The CFG reducing back tapers that a kind of extruding and removing soil complex superposition according to embodiment one is nested drilling tool preparation are also provided on the basis of example one
Stepped ramp type stake, it includes main body pile body 71, and at least two back taper stepped ramp type bodies 72 are provided with the main body pile body 71.
Further, the cross section of the back taper stepped ramp type body 72 is circle, and vertical section is inverted ladder type.Back taper stepped ramp type body
72 inverted cone disk inclined-plane, can be decomposed into the vertical power vertically downwards in part the tangential force and normal force of the conical surface.
Wherein, the angle of 71 side of main body pile body and horizontal plane is 900。
Preferably, the angle of the inverted cone disk inclined-plane extended line of the back taper stepped ramp type body 72 and main body pile body central axis
Angular range is preferably：300~450。
Preferably, the main body pile body 71 can be inserted with steel reinforcement cage according in design requirement pile body.
To sum up, CFG reducings back taper stepped ramp type stake provided in this embodiment includes main body pile body 71, on the main body pile body 71
At least two back taper stepped ramp type bodies 72 are provided with, its bearing capacity not only has the pile side friction and stake end bottom bearing of traditional pile body,
And the back taper disk inclined-plane of back taper stepped ramp type body 72, the vertical power vertically downwards in part can be decomposed into the conical surface tangential force and
Normal force, soil around pile form passive compression chord state and squeezed state, pile peripheral friction force increase, and synthesis improves holding for single pile
Power is carried, reduces settling amount.Be nested combination construction by extruding and removing soil combination drill tool superposition at the same time, soil compaction, casting at the same time all into,
And pore-forming and concrete pressure filling pile can be disposably completed, the raising of work efficiency is realized, bearing capacity of single pile further improves, at the same time
Cost is reduced, shortens the duration.
As it can be seen that the CFG reducing back taper stepped ramp type pile bearing capacitys not only have the pile side friction of traditional pile body and stake end end to hold
Power, and the back taper disk inclined-plane of back taper stepped ramp type body, can be decomposed into the vertical power vertically downwards in part the tangential force of the conical surface
And normal force, soil around pile form passive compression chord state and squeezed state, pile peripheral friction force increase；Again since each drilling tool is equal
With squeeze, casting complex function, extruding and removing soil combination drill tool superposition is nested combination construction, and soil compaction, casting are at the same time all into and can one
Secondary property completes pore-forming and concrete pressure fills pile, realizes the raising of work efficiency, bearing capacity of single pile further improves, and reduces sedimentation
Amount, while cost is reduced, shorten the duration.Therefore the optimization of pile-type, the improvement of drilling tool function, synthesis embody the three of engineering method
High feature：High quality, high speed, high benefit.Energy saving, emission reduction green construction engineering method makes enterprise be benefited, and owner is benefited, society by
Benefit.
Embodiment three
With reference to shown in Figure 10 a to Figure 10 g and Figure 11 a to Figure 11 h, the present embodiment three also provides one kind according to the institute of embodiment one
The extruding and removing soil complex superposition stated is nested drilling tool to prepare the method for CFG reducing back taper stepped ramp type stakes, it includes the following steps：
By power set (such as：Power motor) 3 clockwise/counterclockwise of center drilling tool is rotated, move down at the same time；
First linkage 32 of center drilling tool 3 close to intermediate sleeve drilling tool 4 the second linkage 42 when, set by auxiliary
Standby hoisting mechanism 1 lifts outer sleeve drilling tool 5, and (specifically, hoisting mechanism 1 lifts casing 57 by steel wire rope 2, and casing 57 drives and carries
Rise outer sleeve drilling tool 5), the 3rd linkage 52 of outer sleeve drilling tool 5 is arranged and is locked in the second linkage of intermediate sleeve drilling tool 4
On device 42,4 Synchronous lifting of intermediate sleeve drilling tool is then driven, the second linkage 42 of intermediate sleeve drilling tool 4 is finally arranged
And be locked on the first linkage 32 of center drilling tool 3, each linkage locks mutually that (interlocking here is at least at this time
It is spacing to can be understood as radial direction, also there is corresponding position-limiting action under the action of hoisting mechanism 1 in axial direction certainly)；
By power set (such as：Power motor) making each drilling tool, clockwise/counterclockwise rotates at the same time, and to moving down
It is dynamic；
When each drilling tool is drilled into respective projected depth, stop operating, drilling machine master winch lifting center drilling tool 3, center drilling tool 3
Lower end drill bit 35 open and (expose discharge port), concrete pump 8 start, start pressure concrete injecting, the lifting center drilling tool 3 in pressure concrete injecting, it
Lift intermediate sleeve drilling tool 4, outer sleeve drilling tool 5 successively afterwards.(two kinds of interactive Lifting schemes of center drilling tool and intermediate sleeve drilling tool：
First, 35 horizontal interface dimensions of drill bit are slightly larger than 4 bottom size of intermediate sleeve drilling tool；Second, power set lower end and intermediate sleeve
The 4 spacing control of upper end steel wire rope of drilling tool, locating dimension are：Drilling tool 3 length in center cuts 4 length of intermediate sleeve drilling tool.Center
3 bottom of drilling tool, 4 bottom Synchronous lifting of intermediate sleeve drilling tool to 5 bottom of outer sleeve drilling tool, during flat mouth, ancillary equipment hoisting mechanism 1
The spacing height of outer sleeve drilling tool 5 is controlled by steel wire rope, three kinds of drilling tools are synchronously carried to outside aperture by master winch at this time), until outer
Sleeve drilling tool 5 proposes aperture absolute altitude, while concrete also presses and fills pile to designed elevation.
Further, include the following steps when the ancillary equipment hoisting mechanism 1 lifts outer sleeve drilling tool 5：In outer sleeve
One casing 57 is installed on drilling tool 5, is provided with spring assembly on casing 57, ancillary equipment hoisting mechanism 1 by steel wire rope 2,
Spring assembly is connected with casing 57, and the action of stress automatic lifting is preset using hoisting mechanism 1, in the case where center drilling tool 3 is rotatably assorted,
Make the 3rd linkage 52 of outer sleeve drilling tool 5, the second linkage 42 of intermediate sleeve drilling tool 4, the first of center drilling tool 3
Dynamic device 32 is superimposed the locking that is nested automatically；And realize that hoisting mechanism presets stress by preset function on hoisting mechanism 1, lead to
Cross steel wire rope, spring assembly realizes automatic work.
The 3rd linkage 52 of outer sleeve drilling tool 5 is enable certainly by steel wire rope 2, spring assembly using hoisting mechanism 1
It is dynamic to be set on the second linkage 42 of intermediate sleeve drilling tool 4；Similarly the second linkage of intermediate sleeve drilling tool can be certainly
It is dynamic to be set on the first linkage of center drilling tool.
The principle of setting back taper stepped ramp type body 72 and the drilling tool that is nested using different types of extruding and removing soil complex superposition：
There is earth formation stabilization (more than level of ground water) in pile foundation or basement process scope internal upper part, compressibility is smaller, holds
Two or more back taper stepped ramp type bodies 72 can be set when carrying the stratum that power is higher, thickness is larger.
Extruding and removing soil drilling tool based on squeezing be suitable for that water content is higher or saturation cohesive soil except with weakness, soft place
Ground base based on soil.
Note：During drilling machine master winch lifting drilling tool, ancillary equipment hoisting mechanism 1 accordingly coordinates.Intermediate sleeve drilling tool 4 is
When most, such a linkage is stackable to be nested interlocking in place, forms inverted ladder type multi-step back taper stepped ramp type stake.
To sum up, which not only has the pile side friction of traditional pile body and stake end end to hold
Power, and the back taper disk inclined-plane of back taper stepped ramp type body, can be decomposed into the vertical power vertically downwards in part the tangential force of the conical surface
And normal force, soil around pile form passive compression chord state and squeezed state, pile peripheral friction force increase；Again since each drilling tool is equal
With squeeze, casting complex function, extruding and removing soil combination drill tool superposition is nested combination construction, and soil compaction, casting are at the same time all into and can one
Secondary property completes pore-forming and concrete pressure fills pile, realizes the raising of work efficiency, bearing capacity of single pile further improves, and reduces sedimentation
Amount, while cost is reduced, shorten the duration.Therefore the optimization of pile-type, the improvement of drilling tool function, synthesis embody the three of engineering method
High feature：High quality, high speed, high benefit.Energy saving, emission reduction green construction engineering method makes enterprise be benefited, and owner is benefited, society by
Benefit.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe is described in detail the present invention with reference to foregoing embodiments, it will be understood by those of ordinary skill in the art that：Its according to
Can so modify to the technical solution described in foregoing embodiments, either to which part or all technical characteristic into
Row equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the present invention technology
The scope of scheme.
Claims (9)
- The drilling tool 1. a kind of extruding and removing soil complex superposition is nested, it is characterised in that including：The outer sleeve drilling tool that is sequentially coaxially arranged, in Between sleeve drilling tool and center drilling tool；Wherein, among the outer sleeve drilling tool, intermediate sleeve drilling tool and center drilling tool at least one by one have squeeze, casting it is compound The tool body of function is formed；The outside diameter of the core pipe of the tool body gradually increases from bottom to top, and is squeezed according to predetermined Native ratio is changed；The soil compaction ratio is defined as core pipe overall diameter and tool body diameter ratio；The tool body The width of helical blade is gradually reduced from bottom to top, so that the outer contour of all helical blades is distributed in equal diameter；The center drilling tool is provided with the first linkage；The intermediate sleeve drilling tool is provided with the second linkage；It is described outer Sleeve drilling tool is provided with the 3rd linkage；When the outer sleeve drilling tool is moving upward, the 3rd linkage can It is arranged and is locked on second linkage, second linkage can be arranged and be locked in the first linkage dress Put.
- 2. drilling tool according to claim 1, it is characterised in thatThe center drilling tool includes：Hollow drill, retractable drill bit and the first helical blade；First helical blade is along institute Being axially set on the outer wall of the hollow drill for hollow drill is stated, the drill bit is connected to the lower end of the hollow drill, First linkage is coaxially disposed in the upper end of the hollow drill, and the first method is provided with first linkage Blue disk；Wherein, centered on the top of the hollow drill drilling tool soil compaction drilling tool, drilling tool centered on the lower part of the hollow drill Casting drilling tool；The soil compaction of the soil compaction drilling tool than number range in 0.6-1.0, the soil compaction ratio of the soil compaction drilling tool by down toward Upper gradually ascending gradual change；Wherein, the soil compaction of the casting drilling tool than number range be less than 0.6；Wherein, the soil compaction ratio of the casting drilling tool is under Supreme gradually ascending gradual change is certain value.
- 3. drilling tool according to claim 2, it is characterised in thatThe intermediate sleeve drilling tool includes：First sleeve drilling tool and the second helical blade, second helical blade is along described One sleeve drilling tool is axially set on the outer wall of the first sleeve drilling tool, and second linkage is coaxially disposed in described The upper end of first sleeve drilling tool, second flange disk is provided with the upper end of second linkage, wherein, first sleeve Drilling tool uses soil compaction than the tool body not less than 0.6 and based on soil compaction.
- 4. drilling tool according to claim 3, it is characterised in thatThe outer sleeve drilling tool includes：Second sleeve drilling tool, the 3rd helical blade and casing, the 3rd helical blade is described in Second sleeve drilling tool is axially set on the outer wall of the second sleeve drilling tool, and the 3rd linkage is arranged at described The upper end of two sleeve drilling tools, the casing are arranged at the outer sleeve drilling tool upper end, and be provided with the casing for The spring assembly that hoisting mechanism steel wire rope is connected, the 3rd ring flange is provided with the upper end of the 3rd linkage.Wherein, institute State second sleeve drilling tool and use soil compaction than the tool body not less than 0.6 and based on soil compaction.
- 5. drilling tool according to claim 2, it is characterised in thatFirst linkage includes the first cubic cylinder, and the described first cubic cylinder is coaxially arranged with section as circular the One sets of holes, first sets of holes are used for the upper end for being fixed on the center drilling tool；Second linkage includes the second cubic cylinder, and the described second cubic cylinder is coaxially arranged with section as square the Two sets of holes, second sets of holes are used to be inserted in first linkage；3rd linkage includes cylinder, and it is the 3rd square sets of holes that the cylinder, which is coaxially arranged with section, described 3rd sets of holes are used to be inserted in second linkage.
- 6. in a kind of 1-5 according to claim extruding and removing soil complex superposition described in any one be nested drilling tool preparation CFG reducings fall Bore stepped ramp type stake, it is characterised in that including main body pile body, at least two back taper stepped ramp type bodies are provided with the main body pile body, The main body pile body can be inserted with steel reinforcement cage according in design requirement pile body.
- 7. CFG reducings back taper stepped ramp type stake according to claim 6, it is characterised in that the horizontal stroke of the back taper stepped ramp type body Section is circle, and vertical section is inverted ladder type；The inverted cone disk inclined-plane extended line of the back taper stepped ramp type body and main body pile body center The angle angular range of axis is：30 °~45 °.
- 8. the extruding and removing soil complex superposition in a kind of 1-5 according to claim described in any one is nested drilling tool to prepare CFG reducings The method of back taper stepped ramp type stake, it is characterised in that include the following steps：Center drilling tool clockwise/counterclockwise is rotated by power set, is moved down at the same time；First linkage of center drilling tool close to intermediate sleeve drilling tool the second linkage when, by ancillary equipment hoisting mechanism Outer sleeve drilling tool and intermediate sleeve drilling tool are lifted, them is contacted with each drilling tool linkage, each linkage is in Heart drilling tool rotates, the action of the default stress automatic lifting of hoisting mechanism, realizes and is superimposed the locking that is nested automatically, so that each linkage dress Put mutual locking；Making each drilling tool by power set, clockwise/counterclockwise rotates at the same time, and moves down；When each drilling tool is drilled into respective projected depth, stop operating, drilling machine master winch lifting center drilling tool, by under the drilling tool of center Hold drill bit to open, start concrete pump, start pressure concrete injecting, the lifting center drilling tool in pressure concrete injecting, lifts intermediate sleeve and bore successively afterwards Tool, outer sleeve drilling tool, until outer sleeve drilling tool is mentioned into aperture absolute altitude, while concrete also presses and fills pile to designed elevation.
- 9. the sides of CFG reducing back taper stepped ramp type stakes is prepared according to the drilling tool that is nested of the extruding and removing soil complex superposition described in claim 8 Method, it is characterised in that include the following steps during the ancillary equipment lift mechanism lifts outer sleeve drilling tool：One casing is installed on outer sleeve drilling tool, spring assembly is provided with casing, ancillary equipment hoisting mechanism passes through steel Cord, spring assembly and casing connect, and preset the action of stress automatic lifting using hoisting mechanism, drilling tool is rotatably assorted at center Under, fill the first linkage of the 3rd linkage of outer sleeve drilling tool, the second linkage of intermediate sleeve drilling tool, center drilling tool Put and be superimposed the locking that is nested automatically；And realize that hoisting mechanism presets stress by preset function on hoisting mechanism, pass through steel wire Rope, spring assembly realize that each linkage is superimposed the automatic work for the locking that is nested automatically.
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| CN201810069522.5A CN108035341A (en) | 2018-01-24 | 2018-01-24 | Extruding and removing soil complex superposition is nested drilling tool, the back taper stepped ramp type stake of CFG reducings and method |
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| CN201810069522.5A CN108035341A (en) | 2018-01-24 | 2018-01-24 | Extruding and removing soil complex superposition is nested drilling tool, the back taper stepped ramp type stake of CFG reducings and method |
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| CN109025808A (en) * | 2018-10-11 | 2018-12-18 | 李广信 | More power guide position linkage combination drill tools, preparation method and pile-type |
| CN109098655A (en) * | 2018-10-11 | 2018-12-28 | 李广信 | More Power compound drilling tools, preparation method and type stake |
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Application publication date: 20180515 Assignee: Hebei cone base civil engineering Co., Ltd. Assignor: Li Guangxin Contract record no.: 2018990000277 Denomination of invention: Soil extruding and discharging composite stacking sleeving drill tool, CFG reducing inverted-cone stepped pile and method License type: Exclusive License Record date: 20181022 |
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