CN206753495U - The back taper stepped ramp type stake of CFG reducings and drilling tool - Google Patents
The back taper stepped ramp type stake of CFG reducings and drilling tool Download PDFInfo
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- CN206753495U CN206753495U CN201720537813.3U CN201720537813U CN206753495U CN 206753495 U CN206753495 U CN 206753495U CN 201720537813 U CN201720537813 U CN 201720537813U CN 206753495 U CN206753495 U CN 206753495U
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Abstract
Technical field of buildings is the utility model is related to, more particularly, to a kind of CFG reducings back taper stepped ramp type stake and drilling tool.The drilling tool includes：Outer sleeve drilling tool, intermediate sleeve drilling tool and the center drilling tool being sequentially coaxially arranged；The center drilling tool is provided with the first linkage；The intermediate sleeve drilling tool is provided with the second linkage；The outer sleeve drilling tool is provided with the 3rd linkage；Each linkage on the drilling tool is superposition phase shell type, by being engaged with auxiliary equipment hoist engine, can finally form a kind of CFG reducings back taper stepped ramp type stake.The CFG reducing back taper stepped ramp type pile bearing capacitys not only have 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, the vertical power vertically downwards in part can be decomposed into the tangential force and normal force of the conical surface, soil around pile forms passive compression chord state and squeezed state, pile peripheral friction force increases, the comprehensive bearing capacity for improving single pile, reduces settling amount.
Description
Technical field
Technical field of buildings is the utility model is related to, more particularly, to a kind of CFG reducings back taper stepped ramp type stake and drilling tool.
Background technology
In the tide of reform and opening-up, construction industry has a rapid development, and design of the architectural engineering to ground, construction requirement are got over
Come higher, concrete stake and reinforced concrete pile are used widely in the engineerings such as skyscraper, bridge, harbour, in order that concrete stake and steel
Muscle concrete stake meets bending resistance, anti-shearing, improves the design requirement such as bearing capacity and shockproof requirements, the shape of concrete stake and reinforced concrete pile is entered
Row changes.Design requirement can not only be met, save material dosage, moreover it is possible to improve construction quality and shorten construction speed.
The traditional pile-type built with existing equipment, its vertical and horizontal section are typically not long with stake and change circular or square
Stake, its bearing capacity are mainly made up of the frictional resistance of stake side and the bottom bearing at stake end.
Utility model content
The purpose of this utility model is to provide a kind of CFG reducings back taper stepped ramp type stake and drilling tool, to solve existing set
Single, the not high technical problem of bearing capacity for the traditional pile-type structure type built.
In order to solve the above technical problems, in a first aspect, the utility model provides a kind of drilling tool, it includes：Sequentially coaxially cover
If outer sleeve drilling tool, intermediate sleeve drilling tool and center drilling tool；The center drilling tool is provided with the first linkage；The centre
Sleeve drilling tool is provided with the second linkage；The outer sleeve drilling tool is provided with the 3rd linkage；In the outer sleeve drilling tool
When being moving upward, the 3rd linkage can be arranged and be locked on second linkage, second linkage
Device can be arranged and be locked on first linkage.
Further, the center drilling tool includes：Hollow drill, retractable drill bit and the first helical blade；Described
One helical blade is axially set on the outer wall of the hollow drill along the hollow drill, and the drill bit is connected to the sky
The lower end of heart drilling rod, first linkage are coaxially disposed in the upper end of the hollow drill, in first linkage
On be provided with first flange disk.
Further, the intermediate sleeve drilling tool includes：First sleeve drilling tool and the second helical blade, second spiral
Blade is axially set on the outer wall of the first sleeve drilling tool along the first sleeve drilling tool, on the first sleeve drilling tool
Multiple earth discharging holes are provided with, second linkage is coaxially disposed in the upper end of the first sleeve drilling tool, described second
The upper end of linkage is provided with second flange disk.
Further, the outer sleeve drilling tool includes：Second sleeve drilling tool, the 3rd helical blade and casing, the described 3rd
Helical blade is axially set on the outer wall of the second sleeve drilling tool along the second sleeve drilling tool, and the second sleeve is bored
Multiple earth discharging holes are provided with tool, the 3rd linkage is arranged at the upper end of the second sleeve drilling tool, and the casing is set
The outer sleeve drilling tool upper end is placed in, and the spring assembly for being connected with steel wire rope of windlass is provided with the casing,
Stopping means is set on the spring assembly, the upper end of the 3rd linkage is provided with the 3rd ring flange.
Further, first linkage includes the first cubic cylinder, and the first cubic cylinder is coaxially arranged with
Section is the first circular sets of holes, and 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 it is square that the 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 utility model also provides a kind of CFG prepared according to the drilling tool
Reducing back taper stepped ramp type stake, it includes main body pile body, and at least two back taper stepped ramp type bodies are provided with the main body pile body.
Further, the cross section of the back taper stepped ramp type body is circle, and vertical section is inverted ladder type.
Further, the angle of the inverted cone disk inclined-plane extended line of the back taper stepped ramp type body and main body pile body central axis
Angular range is preferably：30 °~45 °.
Using above-mentioned technical proposal, the utility model has the advantages that：
The utility model provides a kind of drilling tool, and each linkage on the drilling tool is superposition phase shell type, is set with auxiliary
Standby hoist engine is engaged, and so as to form multiple back taper stepped ramp type drillings, lifting drilling tool successively, pressure concrete injecting is achieved simultaneously
A kind of CFG reducings back taper stepped ramp type stake.
The utility model provides a kind of CFG reducings back taper stepped ramp type stake, and its bearing capacity not only has the stake side of traditional pile body
Frictional resistance and stake end bottom bearing, and the back taper disk inclined-plane of back taper stepped ramp type body, can be the vertical power vertically downwards in part point
The tangential force and normal force for the conical surface are solved, soil around pile forms passive compression chord state and squeezed state, and pile peripheral friction force increases,
The comprehensive bearing capacity for improving single pile, reduces settling amount.Structural change function, the bearing capacity Ke Yong Tai Shaji of this
(Terzaghi) bearing capacity formulas calculates.
Brief description of the drawings
, below will be right in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
The required accompanying drawing used is briefly described in embodiment or description of the prior art, it should be apparent that, describe below
In accompanying drawing be some embodiments of the present utility model, for those of ordinary skill in the art, do not paying creativeness
On the premise of work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation that the utility model drilling tool is in original state；
Fig. 2 is the structural representation that the utility model drilling tool is in lifting state；
Fig. 3 is the structural representation of the utility model center drilling tool；
Fig. 4 is the structural representation of the linkage of the utility model first；
Fig. 5 is the structural representation of the utility model intermediate sleeve drilling tool；
Fig. 6 is the structural representation of the linkage of the utility model second；
Fig. 7 is the structural representation of the utility model outer sleeve drilling tool；
Fig. 8 is the structural representation of the linkage of the utility model the 3rd；
Fig. 9 is the structural representation of the utility model CFG reducing back taper stepped ramp type stakes；
Figure 10 to Figure 16 is the construction procedure schematic diagram of the utility model drilling tool.
In figure, 1 is hoist engine, and 2 be steel wire rope, and drilling tool centered on 3,31 be first flange disk, and 32 be the first linkage,
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, and 42 be
Two linkages, 43 be the first sleeve drilling tool, and 44 be the second helical blade, and 45 is bore earth discharging hole, and 5 be outer sleeve drilling tool, and 51 are
3rd ring flange, 52 be the 3rd linkage, and 53 be second sleeve drilling tool, and 54 be the 3rd helical blade, and 55 be to bore earth discharging hole, 56
It is main body pile body for casing, 71,72 be back taper stepped ramp type body；8 be concrete pump.
Embodiment
The technical solution of the utility model is clearly and completely described below in conjunction with accompanying drawing, it is clear that described
Embodiment is the utility model part of the embodiment, rather than whole embodiments.Based on the embodiment in the utility model, sheet
The every other embodiment that field those of ordinary skill is obtained under the premise of creative work is not made, belongs to this practicality
Novel protected scope.
Specific embodiment of the present utility model is described in detail below in conjunction with accompanying drawing.It should be appreciated that herein
Described embodiment is merely to illustrate and explained the utility model, is not limited to the utility model.
Embodiment one
With reference to shown in Fig. 1 to Fig. 2, the present embodiment provides a kind of drilling tool, and it includes：The outer sleeve drilling tool being sequentially coaxially arranged
5th, intermediate sleeve drilling tool 4 and center drilling tool 3；The center drilling tool 3 is provided with the first linkage 32；The intermediate sleeve drilling tool
4 are provided with the second linkage 42；The outer sleeve drilling tool 5 is provided with the 3rd linkage 52；In the quilt of outer sleeve drilling tool 5
When being lifted up, the 3rd linkage 52 can be arranged and be locked on second linkage 42, and described second
Dynamic device 42 can be arranged and be locked on first linkage 32.
It can be seen that each linkage of drilling tool is to be superimposed phase shell type in the present embodiment, each linkage on the drilling tool
It can be engaged with auxiliary equipment hoist engine 1, so as to form multiple back taper stepped ramp type drillings, lift drilling tool successively and press simultaneously
Fill concrete and be achieved a kind of CFG reducings back taper stepped ramp type stake.
With reference to shown in Fig. 3 to Fig. 4, center drilling tool described in the present embodiment 3 includes：Hollow drill 33, retractable drill bit
35 and first helical blade 34；First helical blade 34 is axially set in the hollow drill along the hollow drill 33
On 33 outer wall, the drill bit 35 is connected to the lower end of the hollow drill 33, first linkage 32 be coaxially disposed in
The upper end of the hollow drill 33, first flange disk 31 is provided with first linkage 32.
With reference to shown in Fig. 5 to Fig. 6, intermediate sleeve drilling tool described in the present embodiment 4 includes：First sleeve drilling tool 43 and second
Helical blade 44, second helical blade 44 are axially set in the first sleeve drilling tool along the first sleeve drilling tool 43
On 43 outer wall, multiple earth discharging holes 45 are provided with the first sleeve drilling tool 43, second linkage 42 is coaxially disposed
In the upper end of the first sleeve drilling tool 43, the upper end of second linkage 42 is provided with second flange disk 41.
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 to Fig. 8, outer sleeve drilling tool described in the present embodiment 5 includes：Second sleeve drilling tool 53, the 3rd spiral shell
Vane piece 54 and casing 56, the 3rd helical blade 54 are axially set in described second set along the second sleeve drilling tool 53
On the outer wall of cylinder drilling tool 53, multiple earth discharging holes 55 are provided with the second sleeve drilling tool 53, the 3rd linkage 52 is set
It is placed on the inside of the upper end of the second sleeve drilling tool 53, the casing 56 is arranged at outside the upper end of the second sleeve drilling tool 53
Side, and the spring assembly for being connected with the steel wire rope 2 of hoist engine 1 is provided with the casing 56, set on the spring assembly
Stopping means is put, spring assembly, which stretches or contracts to stopping means to a certain degree, makes its auxiliary equipment hoist engine 1 be stopped, limit
Position device, which is realized, is automatically stopped action.The upper end of 3rd linkage 52 is provided with the 3rd ring flange 51.
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 limit to herein.
The geometry of linkage in the present embodiment can also be according to flexible setting be actually needed, with following a kind of excellent
Mode is selected to illustrate：
First linkage 32 includes the first cubic cylinder, and the 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 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
Its function of disk：Promote corresponding linkage interlocking in place；The vertical pressure of center drilling tool 3 is passed into other sleeve drilling tools.
To sum up, the drilling tool in the present embodiment can coordinate auxiliary equipment to use, auxiliary equipment by hoist engine 1, steel wire rope 2,
Casing 56 forms.This kind of drilling tool connection is mainly realized with combining by the linkage that can be unlocked on drilling tool.Specifically, in rig
Unit head lower end sets hoist engine 1, and hoist engine 1 connects the casing 56 slided up and down by steel wire rope 2.The auxiliary equipment is linkage
Device interactive provides service.Auxiliary equipment, linkage cause more sleeve drilling tool pore-formings for the drilling of multiple back taper stepped ramp types, successively
Pressure concrete injecting is achieved a kind of CFG reducings back taper stepped ramp type stake to lifting drilling tool simultaneously.
Embodiment two
With reference to shown in Fig. 9, the present embodiment two also provides one kind brill according to embodiment one on the basis of embodiment one
Have the CFG reducing back taper stepped ramp type stakes prepared, it includes main body pile body 71, and being provided with least two on the main body pile body 71 falls
Bore stepped ramp type body 72.Preferably, each section of cross section on main body pile body 71 constantly changes from top to bottom.
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, the vertical power vertically downwards in part can be decomposed into the tangential force and normal force of the conical surface.
Wherein, the angle angle of the side of main body pile body 71 and horizontal plane is slightly less than or equal to 90 °.
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：30 °~45 °.
Preferably, the main body pile body 71 can be inserted with steel reinforcement cage according in design requirement pile body.
To sum up, the CFG reducing back taper stepped ramp types stake that the present embodiment provides 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.
Embodiment three
With reference to shown in Figure 10 to Figure 16, the present embodiment three also provides a kind of drilling tool according to described in embodiment one to prepare
The method of CFG reducing back taper stepped ramp type stakes, it comprises the following steps：
By power set (such as：Power motor) clockwise/counterclockwise of center drilling tool 3 is rotated, move down simultaneously；
First linkage 32 of center drilling tool 3 close to intermediate sleeve drilling tool 4 the second linkage 42 when, set by auxiliary
Standby hoist engine 1 lifts outer sleeve drilling tool 5, and (specifically, hoist engine 1 lifts casing 56 by steel wire rope 2, and casing 56 drives lifting 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 42, the Synchronous lifting of intermediate sleeve drilling tool 4 is then driven, the second linkage 42 of intermediate sleeve drilling tool 4 is finally arranged and locked
Due on the first linkage 32 of center drilling tool 3, now each linkage locks mutually that (interlocking here at least can be with
It is interpreted as radially spacing, also there is corresponding position-limiting action in the presence of hoist engine 1 on axial direction certainly)；
By power set (such as：Power motor) making each drilling tool, clockwise/counterclockwise rotates simultaneously, and to moving down
It is dynamic；
When each drilling tool is drilled into respective projected depth, stop operating, rig master winch lifting center drilling tool 3, center drilling tool 3
Lower end drill bit 35 open and (expose discharging opening), concrete pump 8 starts, start pressure concrete injecting, the lifting center drilling tool 3 in pressure concrete injecting, it
Lift intermediate sleeve drilling tool 4 successively afterwards, (wherein, 35 horizontal interface dimensions of drill bit are slightly larger than intermediate sleeve drilling tool 4 to outer sleeve drilling tool 5
Bottom size, last helical layer blade of the isometrical helical blade lower end of intermediate sleeve drilling tool 4, gradual change helical blade is free of, transversal
Face size is slightly larger than the sleeve-port internal diameter of outer sleeve drilling tool 5), until outer sleeve drilling tool 5 proposes aperture absolute altitude, while concrete also presses filling extremely
Designed elevation.
Further, comprise the following steps when the auxiliary equipment hoist engine 1 lifts outer sleeve drilling tool 5：Bored in outer sleeve
One casing 56 is installed on tool 5, spring assembly is provided with casing 56, auxiliary equipment hoist engine 1 passes through steel wire rope 2, spring
Device is connected with casing 56, and the automatic insertion of the 3rd linkage 52 of outer sleeve drilling tool 5 is enable using the elasticity of spring assembly
On the second linkage 42 of intermediate sleeve drilling tool 4；Similarly make the second of intermediate sleeve drilling tool using the elasticity of spring assembly
Linkage can automatic insertion on the first linkage of center drilling tool.And limited location is set to fill on spring assembly
Put, when the deformation quantity of spring assembly reaches preset length, stopping means control auxiliary equipment hoist engine 1 is stopped.
The principle of back taper stepped ramp type body 72 is set：Pile foundation or basement process scope internal upper part are in the presence of (more than level of ground water)
Two or more back taper stepped ramp type bodies can be set when Rotating fields stabilization, the stratum that compressibility is smaller, bearing capacity is higher, thickness is larger
72。
Note：During rig master winch lifting drilling tool, auxiliary equipment hoist engine 1 accordingly coordinates.Intermediate sleeve drilling tool 4 is more
During number, such a linkage is stackable to be nested interlocking in place, forms inverted ladder type multi-step back taper stepped ramp type stake.
Finally it should be noted that：Various embodiments above is only to illustrate the technical solution of the utility model, rather than it is limited
System；Although the utility model is described in detail with reference to foregoing embodiments, one of ordinary skill in the art should
Understand：It can still modify to the technical scheme described in foregoing embodiments, either to which part or whole
Technical characteristic carries out equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from this practicality newly
The scope of each embodiment technical scheme of type.
Claims (10)
- A kind of 1. drilling tool, it is characterised in that including：Outer sleeve drilling tool, intermediate sleeve drilling tool and the centre drill being sequentially coaxially arranged Tool；The center drilling tool is provided with the first linkage；The intermediate sleeve drilling tool is provided with the second linkage；The overcoat Cylinder drilling tool is provided with the 3rd linkage；When the outer sleeve drilling tool is moving upward, the 3rd linkage can cover And if be locked on second linkage, second linkage can be arranged and be locked in first linkage On.
- 2. drilling tool according to claim 1, it is characterised in that the center drilling tool includes：Hollow drill, retractable brill Head and the first helical blade；The outer wall that is axially set in the hollow drill of first helical blade along the hollow drill On, the drill bit is connected to the lower end of the hollow drill, and first linkage is coaxially disposed in the hollow drill Upper end, first flange disk is provided with first linkage.
- 3. drilling tool according to claim 2, it is characterised in that the intermediate sleeve drilling tool includes：First sleeve drilling tool and Second helical blade, the be axially set in first sleeve drilling tool of second helical blade along the first sleeve drilling tool On outer wall, multiple earth discharging holes are provided with the first sleeve drilling tool, second linkage is coaxially disposed in described first The upper end of sleeve drilling tool.
- 4. drilling tool according to claim 3, it is characterised in that the upper end of second linkage is provided with the second method Blue disk.
- 5. drilling tool according to claim 3, it is characterised in that the outer sleeve drilling tool includes：Second sleeve drilling tool, the 3rd Helical blade and casing, the 3rd helical blade are axially set in the second sleeve drilling tool along the second sleeve drilling tool Outer wall on, multiple earth discharging holes are provided with the second sleeve drilling tool, the 3rd linkage is arranged at described second set The upper end of cylinder drilling tool, the casing is arranged at the outer sleeve drilling tool upper end, and is provided with the casing and to be used for and elevator The connected spring assembly of machine steel wire rope, stopping means is set on the spring assembly, set in the upper end of the 3rd linkage It is equipped with the 3rd ring flange.
- 6. drilling tool according to claim 2, it is characterised in thatFirst linkage includes the first cubic cylinder, and the 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 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.
- 7. the CFG reducing back taper stepped ramp type stakes that in a kind of 1-6 according to claim prepared by drilling tool described in any one, its feature exist In being provided with least two back taper stepped ramp type bodies on, including main body pile body, the main body pile body.
- 8. CFG reducings back taper stepped ramp type stake according to claim 7, 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.
- 9. CFG reducings back taper stepped ramp type stake according to claim 7, it is characterised in that the back taper stepped ramp type body falls The angle angular range of Cone Disc inclined-plane extended line and main body pile body central axis is：30 °~45 °.
- 10. CFG reducings back taper stepped ramp type stake according to claim 7, it is characterised in that be inserted with the main body pile body Steel reinforcement cage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720537813.3U CN206753495U (en) | 2017-05-12 | 2017-05-12 | The back taper stepped ramp type stake of CFG reducings and drilling tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720537813.3U CN206753495U (en) | 2017-05-12 | 2017-05-12 | The back taper stepped ramp type stake of CFG reducings and drilling tool |
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| Publication Number | Publication Date |
|---|---|
| CN206753495U true CN206753495U (en) | 2017-12-15 |
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ID=60618305
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720537813.3U Active CN206753495U (en) | 2017-05-12 | 2017-05-12 | The back taper stepped ramp type stake of CFG reducings and drilling tool |
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| CN (1) | CN206753495U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106948762A (en) * | 2017-05-12 | 2017-07-14 | 李广信 | The stake of CFG reducing back tapers stepped ramp type and preparation method and drilling tool |
-
2017
- 2017-05-12 CN CN201720537813.3U patent/CN206753495U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106948762A (en) * | 2017-05-12 | 2017-07-14 | 李广信 | The stake of CFG reducing back tapers stepped ramp type and preparation method and drilling tool |
| CN106948762B (en) * | 2017-05-12 | 2023-12-08 | 李广信 | CFG reducing back taper stepped pile, preparation method and drilling tool |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Hebei cone base civil engineering Co., Ltd. Assignor: Li Guangxin Contract record no.: 2018990000103 Denomination of utility model: Stepped ramp type stake of CFG reducing back taper and drilling tool Granted publication date: 20171215 License type: Exclusive License Record date: 20180419 |
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| EE01 | Entry into force of recordation of patent licensing contract |