CN108797591A - Casing convolution balanced type pile pulling device and its pile extracting method - Google Patents
Casing convolution balanced type pile pulling device and its pile extracting method Download PDFInfo
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- CN108797591A CN108797591A CN201810611288.4A CN201810611288A CN108797591A CN 108797591 A CN108797591 A CN 108797591A CN 201810611288 A CN201810611288 A CN 201810611288A CN 108797591 A CN108797591 A CN 108797591A
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- casing
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- flange
- pile
- fastener head
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D9/00—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof
- E02D9/02—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof by withdrawing
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
Abstract
The invention discloses a kind of casing convolution balanced type pile pulling device and its pile extracting methods, the device includes convolution drilling machine, it is fixedly connected with power sub on the transmission shaft of convolution drilling machine, the lower end of power sub is fixedly connected with crossover sub, the lower end of crossover sub is fixedly connected with long joining section, and the lower end of long joining section is fixedly connected with working end；This approach includes the following steps：Step a, working end is sent to drilled pile using convolution drilling machine and blocks position；Step b, oil cylinder drives fastener head rotation, fastener head to abolish the concrete cover of part drilled pile by frictional force；Step c, drilled pile is twisted off by the torsion that drilling machine provides that circles round；Step d, drilled piles more than failure mechanics is removed by hoisting machinery；Step e, filler is injected into long joining section；Step f, working end is moved to by ground by the drilling machine that circles round；The present invention can improve the efficiency of pile pulling, and can lower the requirement to power-equipment, while can expand the scope of application of equipment.
Description
Technical field
The invention belongs to useless stakes to remove equipment technical field, be related to a kind of casing convolution balanced type pile pulling device and its pile pulling
Method.
Background technology
With the development of national economic development and the rise of rail traffic, it is often necessary to which the useless pile foundation for remaining in underground is clear
It removes.There are three types of current pile pulling devices common on the market, the first is full-sleeve rotary-cutting type equipment, which at work, is
It is carried out in such a way that drilled pile is completely cut through；Second of equipment is set after bored pile with small-sized by casing
For what drilled pile was little by little cut；The third equipment is outside the drilled pile after setting casing, by casing and drilled pile it
Between leverage be broken；Above-mentioned three kinds of equipment haves the shortcomings that pile pulling efficiency is low, and the scope of application in pile pulling
There is larger limitation.
Invention content
To solve the above-mentioned problems, the present invention devises a kind of casing convolution balanced type pile pulling device and its pile extracting method,
It can improve the efficiency of pile pulling, and can lower the requirement to power-equipment, while can compared with traditional pile pulling device
Expand the scope of application of equipment.
The object of the present invention is achieved like this：
A kind of casing convolution balanced type pile pulling device, including the drilling machine that circles round, are fixedly connected on the transmission shaft for the drilling machine that circles round
The lower end of power sub, power sub is fixedly connected with crossover sub, and the lower end of crossover sub is fixedly connected with long joining section, spreading
The lower end of section is fixedly connected with working end, and working end includes first sleeve, and the upper end of first sleeve is fixed with first flange, and first
The lower end of casing is fixed with drill bit flange, is fixed with several alloy bits on the lower face of drill bit flange, first sleeve it is outer
The circumferential uniformly fixed supporting rack for inner face being provided with opening and be internally provided with cavity on peripheral wall, each supporting rack
Lower part is connected to first sleeve, and the inside of each supporting rack is mounted on the clamp system for clamping drilled pile, each to clamp
Mechanism includes fastener head, connecting rod and the oil cylinder being fixed on the inner top of supporting rack, and the middle part of fastener head passes through shaft and branch
The both sides inner wall of support is hinged, and hinged seat is fixed on the piston rod of oil cylinder, and one end of connecting rod and hinged seat are hinged, the other end with
The outer end of fastener head is hinged.
A kind of casing convolution balanced type pile pulling device, wherein fixed on the madial wall of the supporting rack on the outside of fastener head limited
Position block, the both ends of limited block are fixed with the both sides inner wall of supporting rack；By the setting of limited block, oil cylinder can be avoided because of stroke
The phenomenon that excessive and appearance damages working end.
A kind of casing convolution balanced type pile pulling device, wherein the both sides outer wall ecto-entad of fastener head inner end is gradually received
Contracting forms wedge shape structure；After by using this structure, the concrete that fastener head can more easily be cut into drilled pile is protected
In sheath.
A kind of casing convolution balanced type pile pulling device, wherein solid between supporting rack both sides and the lateral wall of first sleeve
There are three pieces of circumferential directions to put more energy into block surely, it is in the 5th circumferentially distributed reinforcement block that several are fixed between first flange and first sleeve,
It is in the 6th circumferentially distributed reinforcement block that several are fixed between drill bit flange and first sleeve；Pass through setting for circumferential block of putting more energy into
It sets, the structural strength between supporting rack and first sleeve can be improved.
A kind of casing convolution balanced type pile pulling device, wherein fixed between supporting rack and the lateral wall of first sleeve useful
In the sealing plate of the circumferential block of putting more energy into of closing.
A kind of casing convolution balanced type pile pulling device, wherein power sub includes the second casing of cone-shaped, the second casing
Both ends be respectively fixed with for the first upper flange for being fixedly connected of transmission shaft of convolution drilling machine and for crossover sub
Fixed first lower flange in upper end is fixed with several pieces in circumferential equal between the first upper flange, the first lower flange and the second casing
First reinforcement block of even distribution；First reinforcement block is used to increase the knot between the first upper flange, the first lower flange and the second casing
Structure intensity.
A kind of casing convolution balanced type pile pulling device, wherein crossover sub includes third casing and Quadruplet pipe, third set
Pipe is connected with Quadruplet pipe by transition disc, and the upper end of third casing is fixed with to be fixedly connected for the lower end with power sub
Second upper flange, the lower end of Quadruplet pipe are fixed with the second lower flange being fixedly connected for the upper end with long joining section, on second
Several pieces are fixed between flange, third casing and transition disc in circumferential equally distributed second reinforcement block, Quadruplet pipe it is outer
Four are fixed on side wall in circumferential equally distributed first channel steel, the first channel steel extends along the axial direction of Quadruplet pipe, the
Between one channel steel and Quadruplet pipe formed for oil cylinder hydraulic oil pipe by channel, between the second lower flange and Quadruplet pipe
It is in circumferentially distributed third reinforcement block to be fixed with several；By the setting of the first channel steel, between the first channel steel and Quadruplet pipe
The channel of formation passes through for hydraulic oil pipe, and hydraulic oil pipe can be avoided to lead to liquid because generating friction between the inner wall of drilling
There is damaged phenomenon in pressuring oil pipe.
A kind of casing convolution balanced type pile pulling device, wherein long joining section includes at least the 5th casing, the 5th casing
Both ends are respectively and fixedly provided with second flange, and it is in circumferential equally distributed second channel steel that four are fixed on the lateral wall of the 5th casing, the
Two channel steels extend along the axial direction of the 5th casing, are formed between the second channel steel and the 5th casing logical for the hydraulic oil pipe of oil cylinder
The channel crossed, it is in the 4th circumferentially distributed reinforcement block that several are fixed between second flange and the 5th casing；Pass through the second slot
The setting of steel, the channel formed between the second channel steel and the 5th casing pass through for hydraulic oil pipe, can avoid hydraulic oil pipe because
Friction is generated between the inner wall of drilling and hydraulic oil pipe is caused damaged phenomenon occur.
A kind of pile extracting method of casing convolution balanced type pile pulling device, includes the following steps：
When step a, constructing, working end is sent to drilled pile using convolution drilling machine and blocks position；
Step b, the piston rod of the piston rod stretching, extension of drive cylinder, oil cylinder drives fastener head rotation, fastener head by connecting rod
The concrete cover that part drilled pile is abolished by frictional force makes the contact area between fastener head and drilled pile increase, and
Pass through the effect of oil cylinder so that have enough frictional resistances between fastener head and drilled pile；
Step c, drilled pile is twisted off by the torque that drilling machine provides that circles round, i.e., when the drilling machine that circles round provides torque, fastening
Head to drilled pile apply side friction, and drilled pile lower end bury part wedge action under, be located at fastener head at drilling
Stake is twisted off；
Step d, the connection between crossover sub and long joining section is released, and by hoisting machinery by drilling more than failure mechanics
Stake removes；
Step e, filler is injected into long joining section；
Step f, crossover sub is connect with the upper end of long joining section again, and working end is moved to ground by the drilling machine that circles round
Face.
After the present invention is by using above structure, compared with traditional pile pulling device, the efficiency of pile pulling can be improved, and
The requirement to power-equipment can be lowered, while the scope of application of equipment can be expanded.
Description of the drawings
Fig. 1 is the dimensional structure diagram of the present invention；
Fig. 2 is the main structure diagram of working end；
Fig. 3 is schematic cross-sectional views of the Fig. 2 along line A-A；
Fig. 4 is the part-structure schematic diagram of working end；
Fig. 5 is the part-structure schematic diagram of working end；
Fig. 6 is the structural schematic diagram after fastener head is partially embedded into the concrete cover of drilled pile.
Specific implementation mode
The specific embodiment of the invention is described in further detail below in conjunction with the accompanying drawings.
A kind of casing circles round balanced type pile pulling device, including convolution drilling machine 1, is fixedly connected on the transmission shaft for the drilling machine 1 that circles round
The lower end of dynamic connector 2, power sub 2 is fixedly connected with crossover sub 3, and the lower end of crossover sub 3 is fixedly connected with spreading
The lower end of section 4, long joining section 4 is fixedly connected with working end 5, and working end 5 includes first sleeve 51, and the upper end of first sleeve 51 is fixed
There are first flange 52, the lower end of first sleeve 51 to be fixed with drill bit flange 53, be fixed on the lower face of drill bit flange 53 several
A alloy bit 54, circumferential on the periphery wall of first sleeve 51 uniformly fixed there are four inner faces to be provided with opening and internal setting
There are the supporting rack 55 of cavity, the lower part of each supporting rack 55 to be connected to first sleeve 51, the inside of each supporting rack 55 is respectively mounted
It is useful for clamping the clamp system of drilled pile, each clamp system including fastener head 61, connecting rod 62 and is fixed on supporting rack 55
Inner top on oil cylinder 63, the middle part of fastener head 61 is hinged by the both sides inner wall of shaft 64 and supporting rack 55, oil cylinder 63
Hinged seat 65 is fixed on piston rod, one end of connecting rod 62 and hinged seat 65 are hinged, and the outer end of the other end and fastener head 61 is cut with scissors
It connects；In said structure, it is identical to be formed by angle for two neighboring fastener head and the line in the axle center of first sleeve, works as drilled pile
Diameter when being less than 1.5 meters, clamp system and supporting rack, which are arranged 4, to be advisable, and for 1.5 meters or more of drilled pile, can set
Set 6 clamp systems and supporting rack；The outer diameter of drill bit flange in the present apparatus is more than crossover sub, long joining section and first sleeve
Outer diameter.
Be fixed with limited block 66 on the madial wall of the supporting rack 55 in the outside of fastener head 61, the both ends of limited block 66 with support
The both sides inner wall of frame 55 is fixed；By the setting of limited block, oil cylinder can be avoided to occur damaging working end because stroke is excessive
Phenomenon.
The both sides outer wall ecto-entad of 61 inner end of fastener head gradually tapers up to form wedge shape structure；By using this knot
After structure, fastener head can be more easily cut into the concrete cover of drilled pile.
It is respectively and fixedly provided with three pieces of circumferential directions between 55 both sides of supporting rack and the lateral wall of first sleeve 51 to put more energy into block 56, first flange
It is in the 5th circumferentially distributed reinforcement block 58, drill bit flange 53 and first sleeve 51 that several are fixed between 52 and first sleeve 51
Between be fixed with several be in the 6th circumferentially distributed reinforcement block 59；By the setting of circumferential block of putting more energy into, supporting rack can be improved
Structural strength between first sleeve.
The sealing plate 57 for closing circumferential block 56 of putting more energy into is fixed between supporting rack 55 and the lateral wall of first sleeve 51.
Power sub 2 includes the second casing 21 of cone-shaped, the both ends of the second casing 21 be respectively fixed with for convolution
The first upper flange 22 that the transmission shaft of drilling machine 1 is fixedly connected and for fixed first lower flange 23 in the upper end of crossover sub 3,
Several pieces are fixed between first upper flange 22, the first lower flange 23 and the second casing 21 in circumferential equally distributed first to reinforce
Block 24；First reinforcement block is used to increase the structural strength between the first upper flange, the first lower flange and the second casing.
Crossover sub 3 includes third casing 31 and Quadruplet pipe 32, and third casing 31 and Quadruplet pipe 32 pass through transition disc
33 connections, the upper end of third casing 31 are fixed with the second upper flange 34 for being fixedly connected with the lower end of power sub 2, and the 4th
The lower end of casing 32 is fixed with the second lower flange 35 for being fixedly connected with the upper end of long joining section 4, the second upper flange 34, third
Several pieces are fixed between casing 31 and transition disc 33 in circumferential equally distributed second reinforcement block 36, the outside of Quadruplet pipe 32
Four are fixed on wall in circumferential equally distributed first channel steel 37, the first channel steel 37 prolongs along the axial direction of Quadruplet pipe 32
Stretch, between the first channel steel 37 and Quadruplet pipe 32 formed for oil cylinder 63 hydraulic oil pipe by channel, the second lower flange 35
It is in circumferentially distributed third reinforcement block 38 that several are fixed between Quadruplet pipe 32；By the setting of the first channel steel, first
The channel formed between channel steel and Quadruplet pipe passes through for hydraulic oil pipe, can avoid hydraulic oil pipe because the inner wall with drilling it
Between generate friction and hydraulic oil pipe caused damaged phenomenon occur.
Long joining section 4 includes at least the 5th casing 41, and the both ends of the 5th casing 41 are respectively and fixedly provided with second flange 42, and the 5th
Four are fixed on the lateral wall of casing 41 in circumferential equally distributed second channel steel 43, the second channel steel 43 is along the 5th casing 41
Axial direction extends, formed between the second channel steel 43 and the 5th casing 41 hydraulic oil pipe for oil cylinder 63 by channel, the
It is in the 4th circumferentially distributed reinforcement block 44 that several are fixed between two flanges 42 and the 5th casing 41；Pass through setting for the second channel steel
Set, the channel formed between the second channel steel and the 5th casing passes through for hydraulic oil pipe, can avoid hydraulic oil pipe because with drilling
Inner wall between generate friction and hydraulic oil pipe caused damaged phenomenon occur.
A kind of pile extracting method of casing convolution balanced type pile pulling device, includes the following steps：
When step a, constructing, working end is sent to drilled pile using convolution drilling machine and blocks position；
Step b, the piston rod of the piston rod stretching, extension of drive cylinder, oil cylinder drives fastener head rotation, fastener head by connecting rod
The concrete cover that part drilled pile is abolished by frictional force makes the contact area between fastener head and drilled pile increase, and
Pass through the effect of oil cylinder so that have enough frictional resistances between fastener head and drilled pile；
Step c, drilled pile is twisted off by the torque that drilling machine provides that circles round, i.e., when the drilling machine that circles round provides torque, fastening
Head to drilled pile apply side friction, and drilled pile lower end bury part wedge action under, be located at fastener head at drilling
Stake is twisted off；
Step d, the connection between crossover sub and long joining section is released, and by hoisting machinery by drilling more than failure mechanics
Stake removes；
Step e, filler is injected into long joining section；
Step f, crossover sub is connect with the upper end of long joining section again, and working end is moved to ground by the drilling machine that circles round
Face.
As shown in fig. 6, fastener head, under the driving of the piston rod of oil cylinder, fastener head rotation, head has been abolished part and has been bored
The concrete cover of hole stake, and be embedded in drilled pile.
After the present invention is by using above structure, compared with traditional pile pulling device, the efficiency of pile pulling can be improved, and
The requirement to power-equipment can be lowered, while the scope of application of equipment can be expanded；Efficient pile pulling is because of fastener head
Part concrete cover is abolished, then use twists off method and directly abolishes pile crown；The requirement that can lower to power-equipment is main
It is embodied in：Using after the present apparatus, pulling out for 1.2 meters of diameter and following drilled pile can be completed using the torque of 40 tons of rice；
Drilling efficiency height is mainly reflected in：The outer diameter of drill bit flange in the present apparatus is more than crossover sub, long joining section and first sleeve
Outer diameter so can reduce the friction of crossover sub, long joining section and first sleeve and the soil body, reduce the loss of torque；
It is applied widely to be embodied in：When abolishing useless stake, requiring nothing more than failure mechanics useless stake below, there are 5 meters of build-in regions, break
Stake position can then be determined according to requirement of engineering.
It should be noted that in the embodiment above, as long as reconcilable technical solution can carry out permutation and combination, this
Field technology personnel can be possible to according to the mathematical knowledge limit of permutation and combination, and therefore, the present invention is no longer to permutation and combination
Technical solution afterwards is illustrated one by one, but it is understood that presently disclosed for the technical solution after permutation and combination.
It should be noted that listed above is only a kind of specific embodiment of the present invention.It is clear that the invention is not restricted to
Upper embodiment, acceptable there are many deformations.
In short, all changes that those skilled in the art directly can export or associate from present disclosure
Shape is considered as protection scope of the present invention.
Claims (9)
- The balanced type pile pulling device 1. a kind of casing circles round, including convolution drilling machine (1), it is characterised in that：The convolution drilling machine (1) Power sub (2) is fixedly connected on transmission shaft, the lower end of the power sub (2) is fixedly connected with crossover sub (3), described The lower end of crossover sub (3) is fixedly connected with long joining section (4), and the lower end of the long joining section (4) is fixedly connected with working end (5), The working end (5) includes first sleeve (51), and the upper end of the first sleeve (51) is fixed with first flange (52), and described The lower end of sleeve (51) is fixed with drill bit flange (53), several alloys are fixed on the lower face of the drill bit flange (53) Drill bit (54), it is circumferential on the periphery wall of the first sleeve (51) uniformly fixed inner face to be provided with opening and inside is set It is equipped with the supporting rack (55) of cavity, the lower part of each supporting rack (55) is connected to first sleeve (51), each supporting rack (55) Inside is mounted on the clamp system for clamping drilled pile, each clamp system include fastener head (61), connecting rod (62) and The middle part of the oil cylinder (63) being fixed on the inner top of supporting rack (55), the fastener head (61) passes through shaft (64) and supporting rack (55) both sides inner wall is hinged, and hinged seat (65), one end of the connecting rod (62) are fixed on the piston rod of the oil cylinder (63) Hinged with hinged seat (65), the outer end of the other end and fastener head (61) is hinged.
- The balanced type pile pulling device 2. casing according to claim 1 circles round, which is characterized in that on the outside of the fastener head (61) Supporting rack (55) madial wall on be fixed with limited block (66), the both ends of the limited block (66) with supporting rack (55) two Side inner wall is fixed.
- The balanced type pile pulling device 3. casing according to claim 1 or 2 circles round, which is characterized in that the fastener head (61) The both sides outer wall ecto-entad of inner end gradually tapers up to form wedge shape structure.
- The balanced type pile pulling device 4. casing according to claim 1 circles round, which is characterized in that support frame as described above (55) both sides Three pieces of circumferential directions are respectively and fixedly provided between the lateral wall of first sleeve (51) to put more energy into block (56), the first flange (52) and first set It is in the 5th circumferentially distributed reinforcement block (58), the drill bit flange (53) and first sleeve that several are fixed between pipe (51) (51) it is in the 6th circumferentially distributed reinforcement block (59) that several are fixed between.
- The balanced type pile pulling device 5. casing according to claim 4 circles round, which is characterized in that support frame as described above (55) and the It is fixed between the lateral wall of sleeve (51) and puts more energy into the sealing plates (57) of block (56) for closing circumferential direction.
- The balanced type pile pulling device 6. casing according to claim 1 circles round, which is characterized in that power sub (2) packet The second casing (21) of cone-shaped is included, the both ends of second casing (21) are respectively fixed with for the biography with convolution drilling machine (1) The first upper flange (22) and be used for fixed first lower flange (23) in upper end with crossover sub (3), institute that moving axis is fixedly connected It states and is fixed with several pieces between the first upper flange (22), the first lower flange (23) and the second casing (21) in circumferential equally distributed First reinforcement block (24).
- The balanced type pile pulling device 7. casing according to claim 1 circles round, which is characterized in that crossover sub (3) packet Third casing (31) and Quadruplet pipe (32) are included, the third casing (31) and Quadruplet pipe (32) are connected by transition disc (33) It connects, the upper end of the third casing (31) is fixed with the second upper flange for being fixedly connected with the lower end of power sub (2) (34), the lower end of the Quadruplet pipe (32) is fixed with the second lower flange for being fixedly connected with the upper end of long joining section (4) (35), several pieces are fixed between second upper flange (34), third casing (31) and transition disc (33) in circumferential uniformly to divide The second reinforcement block (36) of cloth is fixed with four on the lateral wall of the Quadruplet pipe (32) in circumferential equally distributed first slot Steel (37), first channel steel (37) along Quadruplet pipe (32) axial direction extend, first channel steel (37) with the 4th set Manage formed between (32) hydraulic oil pipe for oil cylinder (63) by channel, second lower flange (35) and Quadruplet pipe (32) it is in circumferentially distributed third reinforcement block (38) that several are fixed between.
- The balanced type pile pulling device 8. casing according to claim 1 circles round, which is characterized in that the long joining section (4) includes The both ends of at least the 5th casing (41), the 5th casing (41) are respectively and fixedly provided with second flange (42), the 5th casing (41) four are fixed on lateral wall in circumferential equally distributed second channel steel (43), second channel steel (43) is along the 5th set The axial direction for managing (41) extends, and the hydraulic pressure for oil cylinder (63) is formed between second channel steel (43) and the 5th casing (41) Oil pipe by channel, be fixed between the second flange (42) and the 5th casing (41) several be in the circumferentially distributed the 4th Reinforcement block (44).
- 9. a kind of pile extracting method of casing convolution balanced type pile pulling device according to claim 1, which is characterized in that including following Step：When step a, constructing, working end is sent to drilled pile using convolution drilling machine and blocks position；Step b, the piston rod of the piston rod stretching, extension of drive cylinder, oil cylinder drives fastener head rotation, fastener head to pass through by connecting rod Frictional force abolishes the concrete cover of part drilled pile, so that the contact area between fastener head and drilled pile is increased, and pass through The effect of oil cylinder so that have enough frictional resistances between fastener head and drilled pile；Step c, drilled pile is twisted off by the torque that drilling machine provides that circles round, i.e., when the drilling machine that circles round provides torque, fastener head pair Drilled pile apply side friction, and drilled pile lower end bury part wedge action under, be located at fastener head at drilled pile quilt It twists off；Step d, the connection between crossover sub and long joining section is released, and is moved drilled piles more than failure mechanics by hoisting machinery Go out；Step e, filler is injected into long joining section；Step f, crossover sub is connect with the upper end of long joining section again, and working end is moved to by ground by the drilling machine that circles round.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810611288.4A CN108797591B (en) | 2018-06-14 | 2018-06-14 | Sleeve rotary balance type pile pulling device and pile pulling method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810611288.4A CN108797591B (en) | 2018-06-14 | 2018-06-14 | Sleeve rotary balance type pile pulling device and pile pulling method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108797591A true CN108797591A (en) | 2018-11-13 |
| CN108797591B CN108797591B (en) | 2023-09-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810611288.4A Active CN108797591B (en) | 2018-06-14 | 2018-06-14 | Sleeve rotary balance type pile pulling device and pile pulling method thereof |
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| CN (1) | CN108797591B (en) |
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|---|---|
| CN108797591B (en) | 2023-09-12 |
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