CN106400782A - Construction method for construction of foundation pit support bored secant pile walls with rotary drilling rig - Google Patents
Construction method for construction of foundation pit support bored secant pile walls with rotary drilling rig Download PDFInfo
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- CN106400782A CN106400782A CN201610483010.4A CN201610483010A CN106400782A CN 106400782 A CN106400782 A CN 106400782A CN 201610483010 A CN201610483010 A CN 201610483010A CN 106400782 A CN106400782 A CN 106400782A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/06—Placing concrete under water
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
-
- 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
- E02D5/18—Bulkheads or similar walls made solely of concrete in situ
-
- 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
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
A construction method for construction of foundation pit support bored secant pile walls with a rotary drilling rig comprises the steps of preparation for construction, pile casing embedment, the drilling rig in position, mechanical bore forming, wall brushing, bore cleaning, reinforcement cage machining and hoisting, and concrete pouring. According to the construction method for construction of foundation pit support bored secant pile walls with a rotary drilling rig, all casing drill hole forming is adopted for the bored secant pile walls, and because advanced steel sleeves are used for wall protection all along in the construction process, no slurry is needed for wall protection, the cost of slurry making, using and waste slurry processing is saved, soil which is taken out is natural soil, and civilized construction on a construction site can be done well; and with the method, the construction cost can be reduced, the construction speed can be increased, and the quality of a supporting structure is guaranteed actually.
Description
Technical field
The present invention relates to a kind of construction method going along with sb. to guard him hole-drilling interlocking pile using rotary drilling rig construction foundation pit.
Background technology
Nanchang City Hong Gu tunnel east bank ring road next-door neighbour Jiangxi east embankment, embankment is Gravity Retaining Wall, and barricade bottom is jackstone stratum.Former foundation pit enclosure structure is SMW engineering method stake, and being affected mixing pile by barricade bottom jackstone cannot construct to rock stratum, and H profile steel cannot be inserted into designed elevation, and foundation pit enclosure structure cannot meet sealing and stress problem.
Content of the invention
The purpose of the present invention is to provide a kind of construction method going along with sb. to guard him hole-drilling interlocking pile using rotary drilling rig construction foundation pit for prior art is not enough with being actually needed.
Construction method technical scheme of the present invention is:
Ring road foundation pit enclosure φ 850@600mmSMW engineering method stake is improved to the hole-drilling interlocking pile of diameter 1000mm, it is A type stake and two sequence stake Type B stakes that described hole-drilling interlocking pile is divided into a sequence stake, and a sequence stake and two sequence stake elevation of bottoms are with SMW engineering method stake elevation of bottom;The concrete of two sequence stakes merges in embedded interlocking pattern and forms continuous, an overall piling structure;One sequence stake is A type stake pile spacing 1500mm, makees plain stake using underwater casting plastic concrete;Two sequence stakes are Type B stake is the deposited reinforced concrete pile of C30P8 boring under water, is engaged 250mm, pile spacing 1500mm with a sequence stake, steel reinforcement cage elevation of bottom is with SMW engineering method stake H profile steel elevation of bottom.
Described construction method step is:
（1）Preparation of construction
According to stake bit plan and live datum mark, measuring stake position squeeze into visible marking it is ensured that stake position unwrapping wire is accurate at the construction field (site), and datum mark is protected;
（2）Embedded casing
Casing internal diameter 0.2m bigger than bore diameter, excavates stake holes to casing bottom, according to stake holes centralized positioning casing, 1.5m below the bottom water level located underground of casing, casing rises out level of ground water 1.5m～2.0m, and casing memory storage mud exceeds more than level of ground water 0.5m;
（3）Rig is in place
When rotary drilling rig is in place, held stationary, not run-off the straight displacement, for accurate keyhole depth, in frame or on machine pipe, make the scale of control, to be observed in construction, to record.
（4）Mechanical hole building
Proportion and the sand factor of slurry coat method is controlled during rotary drilling rig pore-forming, prevent undergauge or collapse hole during drilling, the dregs of rotary drilling rig pore-forming is transported to interim spoir hole using short car of refuting, occlusion pile driving construction is constructed using jumping stake method, every 9 piles are a construction circulation, first construction A type stake is plastic concrete element stake, and constructing when A type stake was through initial set in 7～9 hours, to close on Type B stake be reinforced concrete pile again;
（5）Brush wall, borehole cleaning
Cut a sequence stake plastic concrete during rotary drilling rig construction two sequence stake, cause seam percolating water to prevent mud skin to be attached to cutting face, carry out brush wall using crane suspention drilled pile brush wall device, after the completion of brush wall, carry out borehole cleaning;
After getting into desired depth, change slurry using sand suction pump borehole cleaning, control 1.15 about away from the mud balance at bottom hole 0.5m, for the sandy soils that soil property is poor, after borehole cleaning, the proportion of hole bottom slurry is 1.15～1.20, bottom hole sediment thickness after borehole cleaning is not more than 50mm, repetition measurement sediment thickness before pouring underwater concrete, and sediment exceedes during regulation borehole cleaning again;
（6）Steel reinforcement cage processing and lifting
Steel reinforcement cage machine qualified by inspection after, using whole of crane or segmental hoisting steel reinforcement cage to stake holes;
（7）Concreting
Concreting adopts tremie method concrete placed under water, timely measured hole inner concrete face height, carries out lifting and the dismounting of conduit, the buried depth controlling conduit is in 2～6m.
A）Plastic concrete pours
Plastic concrete before use, checks whether its slump and impression quality meet the requirements, and per car concrete all takes one group of test specimen, monitors its Slow setting time and slump-loss situation, till the B stake of this both sides is fully completed;
B）Normal concrete pours
Concrete surface close to steel reinforcement cage bottom when rate of flooding suitably slow down, after concrete enters steel reinforcement cage bottom 2～3m, conduit lifting is slow, steadily, it is to avoid excessive or hook strip steel reinforcement cage is impacted in discharging, in case rising of steel cage.
Beneficial effects of the present invention:Hole-drilling interlocking pile adopts all casing drill pore-forming, in work progress, has advanced steel thimble retaining wall all the time, so without mud off, thus having saved the expense that mud making, use and useless slurry are processed, the soil of taking-up is original soil, is conducive to doing well the civilized construction in building site;The method can reduce construction costs, improves speed of application, conscientiously ensures supporting construction quality.
Brief description:
Fig. 1 is the step schematic diagram of construction method of the present invention;
In figure:A is plastic concrete element stake for A type stake;B is reinforced concrete pile for Type B stake.
Specific embodiment
According to Fig. 1, it is engaged pile driving construction using jumping the construction of stake method, every 9 piles are a construction circulation, A type stake of first constructing（Plastic concrete element stake）, when A type stake initial set（About 7～9 hours）Construct again and close on Type B stake（Reinforced concrete pile）, sequence of construction：A1→A3→A5→A2→A4→B1→B2→B3→B4.
Construction method step of the present invention is:
（1）Preparation of construction
According to stake bit plan and live datum mark, measuring stake position squeeze into visible marking it is ensured that stake position unwrapping wire is accurate at the construction field (site), and datum mark is protected;
（2）Embedded casing
Casing internal diameter 0.2m bigger than bore diameter, excavates stake holes to casing bottom, according to stake holes centralized positioning casing, 1.5m below the bottom water level located underground of casing, casing rises out level of ground water 1.5m～2.0m, and casing memory storage mud exceeds more than level of ground water 0.5m;
（3）Rig is in place
When rotary drilling rig is in place, held stationary, not run-off the straight displacement, for accurate keyhole depth, in frame or on machine pipe, make the scale of control, to be observed in construction, to record.
（4）Mechanical hole building
Proportion and the sand factor of slurry coat method is controlled during rotary drilling rig pore-forming, prevent undergauge or collapse hole during drilling, the dregs of rotary drilling rig pore-forming is transported to interim spoir hole using short car of refuting, occlusion pile driving construction is constructed using jumping stake method, every 9 piles are a construction circulation, first construction A type stake is plastic concrete element stake, and constructing when A type stake was through initial set in 7～9 hours, to close on Type B stake be reinforced concrete pile again;
（5）Brush wall, borehole cleaning
Cut a sequence stake plastic concrete during rotary drilling rig construction two sequence stake, cause seam percolating water to prevent mud skin to be attached to cutting face, carry out brush wall using crane suspention drilled pile brush wall device, after the completion of brush wall, carry out borehole cleaning;
After getting into desired depth, change slurry using sand suction pump borehole cleaning, control 1.15 about away from the mud balance at bottom hole 0.5m, for the sandy soils that soil property is poor, after borehole cleaning, the proportion of hole bottom slurry is 1.15～1.20, bottom hole sediment thickness after borehole cleaning is not more than 50mm, repetition measurement sediment thickness before pouring underwater concrete, and sediment exceedes during regulation borehole cleaning again;
（6）Steel reinforcement cage processing and lifting
Steel reinforcement cage machine qualified by inspection after, using whole of crane or segmental hoisting steel reinforcement cage to stake holes;
（7）Concreting
Concreting adopts tremie method concrete placed under water, timely measured hole inner concrete face height, carries out lifting and the dismounting of conduit, the buried depth controlling conduit is in 2～6m.
A）Plastic concrete pours
Plastic concrete before use, checks whether its slump and impression quality meet the requirements, and per car concrete all takes one group of test specimen, monitors its Slow setting time and slump-loss situation, till the B stake of this both sides is fully completed;
B）Normal concrete pours
Concrete surface close to steel reinforcement cage bottom when rate of flooding suitably slow down, after concrete enters steel reinforcement cage bottom 2～3m, conduit lifting is slow, steadily, it is to avoid excessive or hook strip steel reinforcement cage is impacted in discharging, in case rising of steel cage.
Claims (1)
1. a kind of construction method being gone along with sb. to guard him hole-drilling interlocking pile using rotary drilling rig construction foundation pit, be is characterized in that:
Ring road foundation pit enclosure φ 850@600mmSMW engineering method stake is improved to the hole-drilling interlocking pile of diameter 1000mm, it is A type stake and two sequence stake Type B stakes that described hole-drilling interlocking pile is divided into a sequence stake, and a sequence stake and two sequence stake elevation of bottoms are with SMW engineering method stake elevation of bottom;The concrete of two sequence stakes merges in embedded interlocking pattern and forms continuous, an overall piling structure;One sequence stake is A type stake pile spacing 1500mm, makees plain stake using underwater casting plastic concrete;Two sequence stakes are Type B stake is the deposited reinforced concrete pile of C30P8 boring under water, is engaged 250mm, pile spacing 1500mm with a sequence stake, steel reinforcement cage elevation of bottom is with SMW engineering method stake H profile steel elevation of bottom;
Described construction method step is:
（1）Preparation of construction
According to stake bit plan and live datum mark, measuring stake position squeeze into visible marking at the construction field (site), make stake position unwrapping wire accurately, and datum mark is protected;
（2）Embedded casing
Casing internal diameter 0.2m bigger than bore diameter, excavates stake holes to casing bottom, according to stake holes centralized positioning casing, 1.5m below the bottom water level located underground of casing, casing rises out level of ground water 1.5m～2.0m, and casing memory storage mud exceeds more than level of ground water 0.5m;
（3）Rig is in place
When rotary drilling rig is in place, held stationary, not run-off the straight displacement, for accurate keyhole depth, in frame or on machine pipe, make the scale of control, to be observed in construction, to record;
（4）Mechanical hole building
Proportion and the sand factor of slurry coat method is controlled during rotary drilling rig pore-forming, prevent undergauge or collapse hole during drilling, the dregs of rotary drilling rig pore-forming is transported to interim spoir hole using short car of refuting, occlusion pile driving construction is constructed using jumping stake method, every 9 piles are a construction circulation, first construction A type stake is plastic concrete element stake, and constructing when A type stake was through initial set in 7～9 hours, to close on Type B stake be reinforced concrete pile again;
（5）Brush wall, borehole cleaning
Cut a sequence stake plastic concrete during rotary drilling rig construction two sequence stake, cause seam percolating water to prevent mud skin to be attached to cutting face, carry out brush wall using crane suspention drilled pile brush wall device, after the completion of brush wall, carry out borehole cleaning;
After getting into desired depth, change slurry using sand suction pump borehole cleaning, control 1.15 about away from the mud balance at bottom hole 0.5m, for the sandy soils that soil property is poor, after borehole cleaning, the proportion of hole bottom slurry is 1.15～1.20, bottom hole sediment thickness after borehole cleaning is not more than 50mm, repetition measurement sediment thickness before pouring underwater concrete, and sediment exceedes during regulation borehole cleaning again;
（6）Steel reinforcement cage processing and lifting
Steel reinforcement cage machine qualified by inspection after, using whole of crane or segmental hoisting steel reinforcement cage to stake holes;
（7）Concreting
Concreting adopts tremie method concrete placed under water, timely measured hole inner concrete face height, carries out lifting and the dismounting of conduit, the buried depth controlling conduit is in 2～6m;
A）Plastic concrete pours
Plastic concrete before use, checks whether its slump and impression quality meet the requirements, and per car concrete all takes one group of test specimen, monitors its Slow setting time and slump-loss situation, till the B stake of this both sides is fully completed;
B）Normal concrete pours
Concrete surface close to steel reinforcement cage bottom when rate of flooding suitably slow down, after concrete enters steel reinforcement cage bottom 2～3m, conduit lifting is slow, steadily, it is to avoid excessive or hook strip steel reinforcement cage is impacted in discharging, in case rising of steel cage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610483010.4A CN106400782B (en) | 2016-06-28 | 2016-06-28 | A kind of construction method for going along with sb. to guard him hole-drilling interlocking pile using rotary drilling rig construction foundation pit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610483010.4A CN106400782B (en) | 2016-06-28 | 2016-06-28 | A kind of construction method for going along with sb. to guard him hole-drilling interlocking pile using rotary drilling rig construction foundation pit |
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| CN106400782A true CN106400782A (en) | 2017-02-15 |
| CN106400782B CN106400782B (en) | 2019-01-04 |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107975027A (en) * | 2017-11-25 | 2018-05-01 | 北京建材地质工程有限公司 | The construction method that shield launching is reinforced with reaching end soil body |
| CN107989032A (en) * | 2017-11-28 | 2018-05-04 | 深圳市工勘岩土技术有限公司 | A kind of construction method of punching interlocking pile |
| CN108018849A (en) * | 2017-11-25 | 2018-05-11 | 北京建材地质工程有限公司 | A kind of shield launching and the construction method for reaching end soil body reinforcing |
| CN108625369A (en) * | 2018-06-22 | 2018-10-09 | 中铁二局第工程有限公司 | The hard patterning method construction method of interlocking pile in karst area |
| CN108797641A (en) * | 2018-07-20 | 2018-11-13 | 中铁十八局集团有限公司 | A kind of structure and its construction method of Underground Subway Station construction period full station sealing |
| CN109083178A (en) * | 2018-07-24 | 2018-12-25 | 中交航局第三工程有限公司 | It is a kind of element interlocking pile at cut-pff wall water-stop curtain construction method |
| CN109610524A (en) * | 2018-11-29 | 2019-04-12 | 北京地矿工程建设有限责任公司 | The detection of OPT interlocking pile and course control method for use |
| CN109948285A (en) * | 2019-03-29 | 2019-06-28 | 贵州正业工程技术投资有限公司 | A kind of large size Karst depression ball crown type mechanism central excavation localization method |
| CN110093934A (en) * | 2019-05-20 | 2019-08-06 | 中铁七局集团有限公司 | The nothing for going along with sb. to guard him pile driving construction suitable for subway leads wall construction method of interlocking pile |
| CN110306561A (en) * | 2019-07-05 | 2019-10-08 | 广州穗岩土木科技股份有限公司 | A kind of foundation pit hardness construction method of interlocking pile |
| CN110512597A (en) * | 2019-07-26 | 2019-11-29 | 广东厚普建设工程有限公司 | A kind of rotary digging cast-in-place pile construction method |
| CN111305229A (en) * | 2020-03-26 | 2020-06-19 | 中铁隧道集团二处有限公司 | Construction method for constructing sectionwise deep rock drilling secant pile |
| CN113866277A (en) * | 2021-09-22 | 2021-12-31 | 合诚工程咨询集团股份有限公司 | Nondestructive testing method for pile forming quality of large-diameter secant pile |
| CN114482861A (en) * | 2022-01-13 | 2022-05-13 | 中勘资源勘探科技股份有限公司 | Automatic deviation rectifying method for drill hole in deep hole drilling of coal field drilling |
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| CN104929136A (en) * | 2015-07-14 | 2015-09-23 | 上海市水利工程集团有限公司 | Urban complex underground obstacle working condition occlusive pile enclosure construction method |
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| JP2000001849A (en) * | 1998-06-12 | 2000-01-07 | Geotop Corp | Cast-in-place knot pile |
| CN101328712A (en) * | 2008-07-29 | 2008-12-24 | 上海市第二建筑有限公司 | Construction method of interlocking pile for soft soil and soil layer with obstacle |
| CN103388333A (en) * | 2013-07-25 | 2013-11-13 | 中铁十六局集团有限公司 | Construction process for carrying out construction on interlocking pile by adopting rotary drilling rig and mud protection wall method |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107975027A (en) * | 2017-11-25 | 2018-05-01 | 北京建材地质工程有限公司 | The construction method that shield launching is reinforced with reaching end soil body |
| CN108018849A (en) * | 2017-11-25 | 2018-05-11 | 北京建材地质工程有限公司 | A kind of shield launching and the construction method for reaching end soil body reinforcing |
| CN107989032A (en) * | 2017-11-28 | 2018-05-04 | 深圳市工勘岩土技术有限公司 | A kind of construction method of punching interlocking pile |
| CN108625369A (en) * | 2018-06-22 | 2018-10-09 | 中铁二局第工程有限公司 | The hard patterning method construction method of interlocking pile in karst area |
| CN108797641A (en) * | 2018-07-20 | 2018-11-13 | 中铁十八局集团有限公司 | A kind of structure and its construction method of Underground Subway Station construction period full station sealing |
| CN109083178A (en) * | 2018-07-24 | 2018-12-25 | 中交航局第三工程有限公司 | It is a kind of element interlocking pile at cut-pff wall water-stop curtain construction method |
| CN109610524A (en) * | 2018-11-29 | 2019-04-12 | 北京地矿工程建设有限责任公司 | The detection of OPT interlocking pile and course control method for use |
| CN109948285A (en) * | 2019-03-29 | 2019-06-28 | 贵州正业工程技术投资有限公司 | A kind of large size Karst depression ball crown type mechanism central excavation localization method |
| CN110093934A (en) * | 2019-05-20 | 2019-08-06 | 中铁七局集团有限公司 | The nothing for going along with sb. to guard him pile driving construction suitable for subway leads wall construction method of interlocking pile |
| CN110306561A (en) * | 2019-07-05 | 2019-10-08 | 广州穗岩土木科技股份有限公司 | A kind of foundation pit hardness construction method of interlocking pile |
| CN110512597A (en) * | 2019-07-26 | 2019-11-29 | 广东厚普建设工程有限公司 | A kind of rotary digging cast-in-place pile construction method |
| CN111305229A (en) * | 2020-03-26 | 2020-06-19 | 中铁隧道集团二处有限公司 | Construction method for constructing sectionwise deep rock drilling secant pile |
| CN113866277A (en) * | 2021-09-22 | 2021-12-31 | 合诚工程咨询集团股份有限公司 | Nondestructive testing method for pile forming quality of large-diameter secant pile |
| CN114482861A (en) * | 2022-01-13 | 2022-05-13 | 中勘资源勘探科技股份有限公司 | Automatic deviation rectifying method for drill hole in deep hole drilling of coal field drilling |
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Inventor after: Li Zhijun Inventor after: Cao Guangyun Inventor after: Kong Xiangyuan Inventor after: Yang Hongyan Inventor after: Luo Cangning Inventor after: Yi Dingda Inventor after: Xing Yonghui Inventor after: Zhang Wei Inventor after: Sun Chao Inventor after: Song Benle Inventor after: Peng Yanfeng Inventor after: Guo Xiaolong Inventor after: Ye Liang Inventor after: Wang Qiulin Inventor after: Dong Xiaolong Inventor after: Dong Jun Inventor after: Zhang Ronghua Inventor after: Lei Mingxing Inventor after: Duan Jiewen Inventor after: Yao Yuan Inventor before: Guo Xiaolong Inventor before: Gao Kun Inventor before: Shi Yong Inventor before: Cui Hailong Inventor before: Wu Kongyong Inventor before: Pi Zhongqiang Inventor before: Cai Xiao Inventor before: Peng Yanfeng Inventor before: Ye Liang Inventor before: Li Chengjiao Inventor before: Kong Xiangyuan Inventor before: Li Zhijun Inventor before: Luo Cangning Inventor before: Xing Yonghui Inventor before: Zhang Wei Inventor before: Sun Chao Inventor before: Liu Wei Inventor before: Yao Yiwen Inventor before: Shao Yang Inventor before: Dong Jun |
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