CN101818644A - Well digging process of mining vertical shaft by adopting one-drilling well completion and well drilling method - Google Patents
Well digging process of mining vertical shaft by adopting one-drilling well completion and well drilling method Download PDFInfo
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- CN101818644A CN101818644A CN 201010172177 CN201010172177A CN101818644A CN 101818644 A CN101818644 A CN 101818644A CN 201010172177 CN201010172177 CN 201010172177 CN 201010172177 A CN201010172177 A CN 201010172177A CN 101818644 A CN101818644 A CN 101818644A
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- 238000005553 drilling Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000005065 mining Methods 0.000 title claims abstract description 6
- 239000002002 slurry Substances 0.000 claims abstract description 8
- 238000005516 engineering process Methods 0.000 claims description 16
- 239000011435 rock Substances 0.000 claims description 11
- 238000010276 construction Methods 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 239000004568 cement Substances 0.000 claims description 7
- 238000013461 design Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000003245 coal Substances 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 4
- 102000016938 Catalase Human genes 0.000 claims description 3
- 108010053835 Catalase Proteins 0.000 claims description 3
- 230000001914 calming effect Effects 0.000 claims description 3
- 238000012937 correction Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000001556 precipitation Methods 0.000 claims description 3
- 238000011160 research Methods 0.000 claims description 3
- 230000000452 restraining effect Effects 0.000 claims description 3
- 238000003892 spreading Methods 0.000 claims description 3
- 235000010829 Prunus spinosa Nutrition 0.000 abstract 1
- 241001527975 Reynosia uncinata Species 0.000 abstract 1
- 230000007613 environmental effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 2
- 238000004537 pulping Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 238000007569 slipcasting Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 241000425571 Trepanes Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 229910000162 sodium phosphate Inorganic materials 0.000 description 1
- 239000001488 sodium phosphate Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000013638 trimer Substances 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 1
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Abstract
The invention relates to a well digging process of a mining vertical shaft by adopting a one-drilling well completion and well drilling method. The well digging process is mainly used for solving the problems of large equipment occupation rate, high engineering cost, low working efficiency and sloe well completion speed in the existing well completion process of the mining vertical shaft. The well digging process mainly comprises the following steps: 1) drilling the shaft; 2) prefabricating the well wall; 3) sinking the well wall; and 4) carrying out wall back filling; the well is completed by only adopting the way of a primary pilot hole and a primary core drilling hole in the 1) shaft drilling process, the process can greatly improve the well completion speed of well digging by the well drilling method by about 20%; furthermore, as the process only adopts the primary pilot hole for drilling, the process can reduce the equipment occupation rate, reduce the discharge amount of slurry by about 20% and reduce the environmental protection; due to the adoption of a high-power drilling machine, a special drilling tool and reasonable technical parameters, the skew ratio of the well completion is less than 0.04%.
Description
Technical field:
The present invention relates to adopt the construction technology of sinking by boring in the mine working construction, a kind of specifically vertical shaft for mine pit shaft one that is used for is drilled to well sinking by boring technology.
Background technology:
Sinking by boring is a kind of Fully-mechanized comprehensive sinking shaft technology, and the staff realizes digging a well and do not go into the well in ground handling.1. construction technology comprises the stratum broken rock and soil, carries, carries and separate; 2. expand well step by step; 3. well group temporary lining; 4. permanent support comprises the borehole wall manufacture, suspend sinking, support with backfilling, slip casting etc.Utilization drives drilling rod at the major diameter Rotary table for drilling machine of ground configuration, and drilling rod drives the drill bit rotation, and the hobboing cutter on the drill bit is realized rotation and revolution, and the stratum is produced impact, extruding, scraping comprehensive function, and layer is broken on the spot; After boring reaches the degree of depth, creep into and revise well and reach hole deviation partially through repeatedly expanding well again, when reaching intended diameter again with the steel concrete borehole wall prefabricated on the ground or steel plate concrete composite shaft lining, connect by joint with the steel flange dish, in mud-filled wellhole, suspension sinks down into the shaft bottom and makes permanent support.At last in borehole wall periphery with cement paste or other material, the filling well cementation of mud is replaced in segmentation according to formation condition.Existing sinking by boring technology is crept into link owing to comprise repeatedly reaming, though repeatedly reaming can relatively effectively utilize drill capacity, also has many problems: a plurality of reaming bits of needs, and the hold facility amount is big, the engineering cost height; Service working time is long, work efficiency is low, becomes well speed slow, can not satisfy quick shaft building needs.
Summary of the invention:
In order to reduce construction cost, reduce drilling time, accelerate into well speed, the invention provides a kind of vertical shaft for mine pit shaft " is drilled to well " sinking by boring technology.The method that the once leading hole drill of this process using advances improves the one-tenth well speed of sinking by boring greatly, safety, reliable, construction cost is low.
Technical scheme of the present invention is: 1, a kind of vertical shaft for mine pit shaft one is drilled to well sinking by boring technology, mainly comprises the following steps:
1. pit shaft creep into, 2. prefabricated, the 3. 4. support with backfilling of the borehole wall that sinks of the borehole wall.
1. pit shaft creeps into: boring adopts once whole hole, leading hole to become the form of well; It is AD130-1000 type rig that rig adopts the model of Luoyang mining machinery design and research institute and the co-design manufacturing of the special sinking shaft of middle coal company, and hobboing cutter or scraper can be selected insert cutter or middle tooth cutter by geological conditions; Drive kelly and common drilling rod by unit head, drive the drill bit rotation; Insert cutter or middle tooth cutter are housed on the drill bit, the broken rock of rotation under certain pressure, making catalase is landwaste, send into compressed air by the airduct in the drilling rod then, rise the mud that the liquid method will contain landwaste with calming the anger and drain into ground at a high speed, the mud that contains landwaste returns in the well after through ground precipitation purified treatment; The rig rotating speed is 0-18r/min during this time, drill pressure less than drill bit in mud weight 60%, when each stratum handing-over band and weathered zone crept into, the pressure of the drill suitably reduced 5-10T again on original basis.
Be the verticality of monitoring boring,, adopt the ultrasonic wave logging instrument, deviational survey is carried out in boring, can continue construction after meeting standard when creeping into certain depth or boring when finishing, otherwise, adopt correction to handle;
2. the borehole wall is prefabricated: when creeping into, and prefabricated lining on the ground, the borehole wall is the steel concrete borehole wall or steel plate composite shaft lining, does by restraining on the basis after the levelling on the ground;
3. the borehole wall sinks: utilize mud that the buoyancy of the borehole wall is added ballast water then in well, the borehole wall is slowly sunk, and control its hoverheight in mud, and during borehole wall spreading behind centering, weld, the borehole wall is set upright after sinking to the end, qualified after with suitable for reading fixing;
4. support with backfilling: be the annular space filling and injecting slurry between the borehole wall and rock group, from bottom to top branch plurality of sections height carries out, and adopts cement paste and rubble to replace filling, and the first filling section adopts the backfilling cement slurries, rock filling is inserted equably by well head, is consolidated into well then.
Beneficial effect of the present invention is mainly reflected in: owing to adopt above-mentioned technology, will hole and the classification reaming changes into and once holes into well, repeatedly reaming became well speed 25～30m/ month originally, changed the back and became well speed can reach 30～40m/ month, became well speed raising about 20%; Owing to shortened drilling time, it is about 20% that the mud emission amount reduces, and reduces a large amount of mud storage space areas, reduces the pollution to environment; Owing to adopted high-power rig and special drilling tool and rational technical data, make the useful area in the whole hole of drilling well satisfy the installation requirement that borehole wall suspension is sunk, become the deviating rate less than 0.04%.
Description of drawings
Fig. 1 is a leading hole schematic diagram;
Fig. 2 is the schematic diagram of drilling construction.
1-master cylinder among the figure, 2-drilling cramp, 3-balladeur train, 4-unit head, 5-hydraulic pressure, electrical system, 6-drilling machine platform, 7-seals flatcar, 8-drilling rod, 9-drill bit, 11-discharge trough, 13-discharge pipe, 15-ground mud pit, 16-mud groove, 17-mud, 18-wellhole, 19-fore shaft.
The specific embodiment:
The invention will be further described below in conjunction with accompanying drawing:
To shown in Figure 2, this vertical shaft for mine pit shaft one is drilled to well sinking by boring technology, mainly comprises the following steps: by Fig. 1
1. pit shaft creep into, 2. prefabricated, the 3. 4. support with backfilling of the borehole wall that sinks of the borehole wall;
At first 1., pit shaft creeps into: boring adopts once whole hole, leading hole to become the form of well, and as shown in Figure 1,2 is drilling cramp among the figure, and 17 is mud, and 9 is the whole drill in leading hole; The vertical trepan that boring adopts power unit type hydraulic cylinder to promote is made by Luoyang mining machinery design and research institute and the special sinking shaft of middle coal company co-design, and model is an AD130-1000 type rig; Drilling tool can be selected insert cutter or middle tooth cutter according to geological conditions, and topsoil is generally used middle tooth cutter, and rock section is generally used insert cutter; Creep into as shown in Figure 2, drilling machine platform 6 is installed on the ground fore shaft 19, and install and seals flatcar 7 at the female end place of fore shaft 19, and drilling machine platform 6 is equipped with hydraulic pressure, electrical system 5; Process is as follows: master cylinder 1 is by drilling cramp 2 guiding, propulsion power head 4 moves down along balladeur train 3, drive common drilling rod and kelly 8 in the process that moves down, drive drill bit 9 rotations, insert cutter or middle tooth cutter are housed on the drill bit 9, the broken rock of rotation under certain pressure, form wellhole 18 when making catalase be landwaste, send into compressed air by the airduct in the drilling rod 8 then, rise the mud 17 that liquid will contain landwaste with calming the anger and drain into ground mud pit 15 by drilling rod 8 and discharge pipe 13 at a high speed through discharge trough 11, the mud that contains landwaste returns in the well by mud groove 16 after through ground precipitation purified treatment.Technical data is during this time: rig moment of torsion 600kNm, unit head rotating speed 0-18r/min; Drill pressure less than drill bit in mud weight 60%, when each stratum handing-over band and weathered zone crept into, the pressure of the drill suitably reduced 5-10T again on original basis.
Be the verticality of monitoring boring,, adopt the ultrasonic wave logging instrument, deviational survey is carried out in boring, can continue construction after meeting standard when creeping into certain depth or boring when finishing, otherwise, adopt correction to handle;
2. the borehole wall is prefabricated: when creeping into, and prefabricated lining on the ground, the borehole wall is the steel concrete borehole wall and steel plate composite shaft lining, does by restraining on the basis after the levelling on the ground;
3. the borehole wall sinks: be to utilize mud that the buoyancy of the borehole wall is added ballast water then in well, the borehole wall is slowly sunk, and control its hoverheight in mud, and behind centering, weld during borehole wall spreading, what aligning method generally adopted is to fasten a meter word line at borehole wall center, fastens a vertical line and a rice word line central point centering then; The borehole wall is set upright after sinking to the end, and the setting upright of pit shaft just generally adopted two 20-30T jack tops, notes needing to guarantee the synchronism of jack, will suitable for readingly fix after qualified;
4. support with backfilling: be the annular space filling and injecting slurry between the borehole wall and rock group, from bottom to top branch plurality of sections height carries out, adopt cement paste and rubble to replace filling, pipe slip casting method in the first filling section adopts, the backfilling cement slurries, both arranged 5 interior grouting pipelines in pit shaft, wherein 4 are used for first section high filling, and remaining one is used for checking secondary after-teeming slurry behind the wall; Rock filling is inserted equably by well head, is consolidated into well then.
When implementing vertical shaft for mine pit shaft " expands into well " sinking by boring technology, the main technique technical requirements is as follows:
(1) control of pit shaft deflection: drill bit all guarantees to aim at drill center under its free state before creeping into, and its Deviation Control is in 5mm; The employed the pressure of the drill of borings at different levels all less than drill bit in mud weight 60%; When each stratum handing-over band and weathered zone crept into, the pressure of the drill suitably reduced 5-10T again on original basis; Adopting SKD-1 type ultrasonic wave logging instrument, the verticality and the hole diameter of borings at different levels are measured timely, so that in time take satisfactory after correcting, generally is will carry creeping into capable cleaning bottom of hole, reaches requirement up to deviation proportion and hole diameter.
(2) well group is stable: strict control drilling parameter; the pressure of the drill less than drill bit in mud weight 60%; the leading general rotating speed 5r/min in hole; moment of torsion is the 40%-60% of rig peak torque; the general 3r/min of reaming; moment of torsion is 80% of a rig maximum capacity; and take all factors into consideration the mud property parameter; 1. suppress pulping: adopt the high molecular polymer chemical agent, utilize its special construction preferentially to occupy the adsorbable zone on landwaste surface, form topping on its surface; stop effectively with mud in the contacting of Free water; suppress the aquation of slime water, broken landwaste is kept intact substantially, thereby suppress the complete pulping of soil block in creeping into drilling cuttings.2. reduce sand factor: utilize sedimentation basin to lean on the bigger landwaste of action of gravity sedimentation diameter; Discharge less landwaste with cyclone again; And then with more tiny landwaste of sodium phosphate trimer flocculating setting and flour sand.3. reduce fluid loss: if mud viscosity surpasses 24s, first thin up (fluid loss may raise, but the mud skin forms, can not cause too big harm) to 24s adds CMC again, and fluid loss is lowered.4. mud parameter is controlled principle: to control fluid loss, to relax density value is means, and to form the head of liquid of the inboard head of liquid of hole wall greater than the hole wall outside, the assurance well is helped stable.
(3) processing of balled bit: take various several measures, as reducing the mud viscosity, control fluid loss, strict control drilling parameter is offered side draught and is closed up, and strengthens the mud uptake.
This technology becomes well speed to improve about 20% owing to adopt once leading hole to become the technology of well; It is about 20% that the mud emission amount reduces, and reduces the pollution to environment; Owing to adopted high-power rig and special drilling tool and rational technical data, made into the deviating rate less than 0.04%.This technology is not only used coal industry, also can use in other similar underground mine engineering.
Claims (1)
1. a vertical shaft for mine pit shaft one is drilled to well sinking by boring technology, mainly comprises the following steps:
1. pit shaft creep into, 2. prefabricated, the 3. 4. support with backfilling of the borehole wall that sinks of the borehole wall,
1. pit shaft creeps into: whole hole, leading hole is adopted in boring, it is AD130-1000 type rig that rig adopts the model of Luoyang mining machinery design and research institute and the co-design manufacturing of the special sinking shaft of middle coal company, hobboing cutter or scraper can be selected insert cutter or middle tooth cutter by geological conditions, drive kelly and common drilling rod by unit head, drive the drill bit rotation; Insert cutter or middle tooth cutter are housed on the drill bit, the broken rock of rotation under certain pressure, making catalase is landwaste, send into compressed air by the airduct in the drilling rod then, rise the mud that the liquid method will contain landwaste with calming the anger and drain into ground at a high speed, the mud that contains landwaste returns in the well after through ground precipitation purified treatment; The rig rotating speed is 0-18r/min during this time, drill pressure less than drill bit in mud weight 60%, when each stratum handing-over band and weathered zone crept into, the pressure of the drill suitably reduced 5-10T again on original basis.
Be the verticality of monitoring boring,, adopt the ultrasonic wave logging instrument, deviational survey is carried out in boring, can continue construction after meeting standard when creeping into certain depth or boring when finishing, otherwise, adopt correction to handle;
2. the borehole wall is prefabricated: when creeping into, and prefabricated lining on the ground, the borehole wall is the steel concrete borehole wall or steel plate composite shaft lining, does by restraining on the basis after the levelling on the ground;
3. the borehole wall sinks: utilize mud that the buoyancy of the borehole wall is added ballast water then in well, the borehole wall is slowly sunk, and control its hoverheight in mud, and during borehole wall spreading behind centering, weld, the borehole wall is set upright after sinking to the end, qualified after with suitable for reading fixing;
4. support with backfilling: be the annular space filling and injecting slurry between the borehole wall and rock group, from bottom to top branch plurality of sections height carries out, and adopts cement paste and rubble to replace filling, and the first filling section adopts the backfilling cement slurries, rock filling is inserted equably by well head, is consolidated into well then.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010172177 CN101818644B (en) | 2010-05-14 | 2010-05-14 | Well digging process of mining vertical shaft by adopting one-drilling well completion and well drilling method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010172177 CN101818644B (en) | 2010-05-14 | 2010-05-14 | Well digging process of mining vertical shaft by adopting one-drilling well completion and well drilling method |
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| CN101818644A true CN101818644A (en) | 2010-09-01 |
| CN101818644B CN101818644B (en) | 2011-11-30 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102425370A (en) * | 2011-12-21 | 2012-04-25 | 中冶交通工程技术有限公司 | Construction method and device of hole bottom oil pressure motor lithotriptor combined power drilling tool |
| CN102493809A (en) * | 2011-12-12 | 2012-06-13 | 北京中煤矿山工程有限公司 | Comprehensive shaft sinking method of positive and raising boring for vertical shaft |
| CN103046869A (en) * | 2013-01-21 | 2013-04-17 | 葛洲坝集团第二工程有限公司 | The Construction Method of Controlling the Drilling Azimuth Through the Guiding Rock Formation |
| CN103046931A (en) * | 2012-12-03 | 2013-04-17 | 云南建工水利水电建设有限公司 | Method for forming holes of vertical shaft/pilot shaft through impact type drilling machine in impacting mode |
| CN103133004A (en) * | 2013-01-25 | 2013-06-05 | 北京中煤矿山工程有限公司 | Technological process of ground prefabrication and installation of inner shaft wall of freezing shaft |
| CN109025908A (en) * | 2018-08-08 | 2018-12-18 | 中国恩菲工程技术有限公司 | Anti-corrosion drilling shaft lining for salt mine |
| CN109519174A (en) * | 2019-01-09 | 2019-03-26 | 东北大学 | A kind of shaft wall supporting construction |
| CN110344767A (en) * | 2019-08-05 | 2019-10-18 | 鲁维彬 | It is a kind of to be attached using centrifugal force and stable vertical shaft excavating equipment |
| CN110486018A (en) * | 2019-08-14 | 2019-11-22 | 西安科技大学 | Lattice compound shaft structure and construction method |
| CN113374481A (en) * | 2021-06-09 | 2021-09-10 | 中交第二公路勘察设计研究院有限公司 | Well drilling method well sinking process with drilling before and after |
| CN113574243A (en) * | 2019-04-03 | 2021-10-29 | 包尔机械有限公司 | Method for producing a hole in the ground and drilling tool therefor |
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| CN1025799C (en) * | 1990-12-18 | 1994-08-31 | 鹤壁矿务局 | Replacement grouting method for construction of overflowing sand layer of vertical shaft |
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| CN1081266C (en) * | 1997-06-06 | 2002-03-20 | 中国京冶建设工程承包公司 | Hole forming process by wall sliding of large diameter pile |
| WO2003071086A2 (en) * | 2002-02-15 | 2003-08-28 | Enventure Global Technology | Mono-diameter wellbore casing |
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| CN1025799C (en) * | 1990-12-18 | 1994-08-31 | 鹤壁矿务局 | Replacement grouting method for construction of overflowing sand layer of vertical shaft |
| CN1187575A (en) * | 1997-01-08 | 1998-07-15 | 中国京冶建设工程承包公司 | Large diameter pile slip wall holing technique |
| CN1081266C (en) * | 1997-06-06 | 2002-03-20 | 中国京冶建设工程承包公司 | Hole forming process by wall sliding of large diameter pile |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102493809A (en) * | 2011-12-12 | 2012-06-13 | 北京中煤矿山工程有限公司 | Comprehensive shaft sinking method of positive and raising boring for vertical shaft |
| CN102425370A (en) * | 2011-12-21 | 2012-04-25 | 中冶交通工程技术有限公司 | Construction method and device of hole bottom oil pressure motor lithotriptor combined power drilling tool |
| CN102425370B (en) * | 2011-12-21 | 2014-03-26 | 中冶交通工程技术有限公司 | Hole bottom oil pressure motor lithoclast combined power drilling tool construction method and device |
| CN103046931A (en) * | 2012-12-03 | 2013-04-17 | 云南建工水利水电建设有限公司 | Method for forming holes of vertical shaft/pilot shaft through impact type drilling machine in impacting mode |
| CN103046869A (en) * | 2013-01-21 | 2013-04-17 | 葛洲坝集团第二工程有限公司 | The Construction Method of Controlling the Drilling Azimuth Through the Guiding Rock Formation |
| CN103046869B (en) * | 2013-01-21 | 2015-10-14 | 中国葛洲坝集团第二工程有限公司 | Construction method for controlling drilling direction by penetrating through guide rock stratum |
| CN103133004A (en) * | 2013-01-25 | 2013-06-05 | 北京中煤矿山工程有限公司 | Technological process of ground prefabrication and installation of inner shaft wall of freezing shaft |
| CN103133004B (en) * | 2013-01-25 | 2015-03-04 | 北京中煤矿山工程有限公司 | Technological process of ground prefabrication and installation of inner shaft wall of freezing shaft |
| CN109025908A (en) * | 2018-08-08 | 2018-12-18 | 中国恩菲工程技术有限公司 | Anti-corrosion drilling shaft lining for salt mine |
| CN109519174A (en) * | 2019-01-09 | 2019-03-26 | 东北大学 | A kind of shaft wall supporting construction |
| CN113574243A (en) * | 2019-04-03 | 2021-10-29 | 包尔机械有限公司 | Method for producing a hole in the ground and drilling tool therefor |
| CN113574243B (en) * | 2019-04-03 | 2024-05-03 | 包尔机械有限公司 | Method for producing a hole in the ground and drilling tool therefor |
| CN110344767A (en) * | 2019-08-05 | 2019-10-18 | 鲁维彬 | It is a kind of to be attached using centrifugal force and stable vertical shaft excavating equipment |
| CN110486018A (en) * | 2019-08-14 | 2019-11-22 | 西安科技大学 | Lattice compound shaft structure and construction method |
| CN110486018B (en) * | 2019-08-14 | 2020-07-31 | 西安科技大学 | Lattice type composite shaft structure and construction method |
| CN113374481A (en) * | 2021-06-09 | 2021-09-10 | 中交第二公路勘察设计研究院有限公司 | Well drilling method well sinking process with drilling before and after |
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|---|---|
| CN101818644B (en) | 2011-11-30 |
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