CN102235003A - Expanded steel pile tip for prefabricated concrete tubular pile and pile sinking construction method - Google Patents
Expanded steel pile tip for prefabricated concrete tubular pile and pile sinking construction method Download PDFInfo
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- CN102235003A CN102235003A CN 201010166041 CN201010166041A CN102235003A CN 102235003 A CN102235003 A CN 102235003A CN 201010166041 CN201010166041 CN 201010166041 CN 201010166041 A CN201010166041 A CN 201010166041A CN 102235003 A CN102235003 A CN 102235003A
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Abstract
The invention discloses an expanded steel pile tip for a prefabricated concrete tubular pile. The expanded steel pile tip comprises an annular end plate, at least two outwards moving supporting leg steel plates, an annular partition plate and an expander, wherein a section of steel tube with closed bottom is connected below the annular end plate; one end of one supporting leg steel plate and one end of the other supporting leg steel plate are movably connected to the left and right sides of the upper end face of the annular end plate through bolts; the annular partition plate is connected to the upper end faces of the supporting leg steel plates through bolts; the at least two outwards moving supporting leg steel plates are movably connected to the two sides of the upper end face of the annular partition plate through bolts; the expander is arranged in the steel tube with closed bottom, and the outside diameter of the bottom of the expander is smaller than those of central through holes of the annular end plate and the annular partition plate; and the expander is connected with a steel cable. Before the expanded steel pile tip is sunken into the prefabricated concrete tubular pile, the steel pile tip is connected with the tubular pile, and the steel cable passes through the gaps among the annular end plate, the annular partition plate and the supporting leg steel plates and the inner hole of the tubular pile and is led to the top of the tubular pile; and after the expanded steel pile tip is sunken into the tubular pile to the required depth, the steel cable is lifted, and the steel cable drives the expander to upwards jack the supporting leg steel plates, so that the supporting leg steel plates are expanded to the outer side of the tubular pile and inserted into the soil layer of the outer side.
Description
Technical field
The present invention relates to geotechnical engineering, relate in particular to prefabricated concrete pipe pile expanding piling bar point and piling construction method.
Background technology
Usually use prefabricated concrete pipe pile in the soft foundation, improve the soil layer supporting capacity.As China Patent No. CN200610052169.71 disclosed " after-grouting self-guiding hole PHC tubular pole tip anti-rust cap construction equipment and construction technology thereof ", it relates to a kind of after-grouting self-guiding hole PHC tubular pole tip anti-rust cap construction equipment, and the static(al) hydraulic pressure pile press that draws the hole with the band bath qi of chong channel ascending adversely of being made up of water tank, centrifugal multistage pump multiple centrifugal pump, high pressure water transport pipe, pile chuck, Pile feeder, PHC cavity pile tube, high pressure gas pipeline and air compressor links; High-pressure injection pump is connected with high pressure water transport pipe with tee piece by the high-pressure slip-casting pipe, between tee piece and centrifugal multistage pump multiple centrifugal pump and tee piece and high-pressure injection pump one-way cock is housed.A kind of after-grouting self-guiding hole PHC tubular pole tip anti-rust cap construction technology: when PHC cavity pile tube is delivered to bearing stratum by static pressure, stop to wash by water after the qi of chong channel ascending adversely, start high-pressure injection pump, by high-pressure slip-casting pipe, tee piece and high pressure water transport pipe to a certain amount of cement paste of stake point pumping, steel stake point inside and outside is filled up, the surface of stake point forms the anti-rust cap by the cement paste parcel, a stake point and a soil layer isolation, reaches the effect of antirust and consolidated subsoil, raising bearing capacity of pile foundation.
Also just like China Patent No. CN200410040718.X, relate to a kind of high intension hollow synergy pile toe, it is characterized in that whole stake point has a through hole along central longitudinal axis, and be the hollow symmetry shape, the big up and small down pyramidal structure of outside section, the sharp top of stake is a horizontal end plate, is evenly distributed with main muscle anchor hole on it, the most advanced and sophisticated annular steel cutting edge of main muscle anchor hole and awl that main muscle passes on the end plate links to each other, between each main muscle by spiral stirrup Luo Xuan Chan around joining.The shape of cross section on the sharp top of stake is square, rectangle, hexagon, octagon, circle, polygon or random geometry; The through hole shape of cross section at stake point middle part is regular polygon or circle; The most advanced and sophisticated annular steel cutting edge of awl is a closed form high strength steel cutting edge; Stake point middle part is evenly distributed with several main muscle, and with spiral stirrup Luo Xuan Chan around continuous; End plate and annular steel cutting edge intercentrum shape steel plate inboard are welded with several cross one another reinforcing ribs.
But above-mentioned technology all can't apply to the structure of precast concrete pile connected node.
Summary of the invention
The object of the present invention is to provide a kind of prefabricated concrete pipe pile expanding piling bar point and piling construction method, the Expandable piling bar point of prefabricated concrete pipe pile improves holds the supporting effect of power soil layer to the stake point.
For achieving the above object, technical scheme of the present invention is,
Prefabricated concrete pipe pile expanding piling bar point, it comprises, annular endplate, the corresponding central through hole in its lower surface place connects the steel pipe of one section bottom sealing; At least two can be outwards movable supporting leg steel plate, be movably connected on the left and right sides of the upper surface of described annular endplate respectively by bolt; Toroidal membrane is connected in above-mentioned supporting leg steel plate upper surface by 4 bolts; At least two can be outwards movable supporting leg steel plate, be movably connected on the left and right sides of above-mentioned toroidal membrane upper surface respectively by bolt; Expander, bullet is arranged in the steel pipe of the bottom sealing under the annular endplate, and its bottom external diameter is less than the central through hole of annular endplate, toroidal membrane; Connect a steel cable on the expander.
Further, another prefabricated concrete pipe pile of the present invention expanding piling bar point, it comprises, annular endplate, the corresponding central through hole in its lower surface place connects the steel pipe of one section bottom sealing; At least two blocks of supporting leg steel plates that can outwards rotate, the one end is movably connected on the left and right sides of the upper surface of described annular endplate respectively by bolt; Toroidal membrane is connected in above-mentioned supporting leg steel plate upper surface by 4 bolts; At least two blocks of supporting leg steel plates that can outwards rotate, the one end is connected to the left and right sides of above-mentioned toroidal membrane upper surface respectively by the bolt activity; Expander, bullet is arranged in the steel pipe of the bottom sealing under the annular endplate, and its bottom external diameter is greater than the central through hole of annular endplate, toroidal membrane; Connect a steel cable on the expander.
Again, the inside and outside contour of the inside and outside contour size of described annular endplate, toroidal membrane and prefabricated concrete pipe pile steel end plate is measure-alike, and its profile is a donut, or the annular of square-outside and round-inside.
Further, it is identical with the outer profile size of prefabricated concrete pipe pile steel end plate to be positioned at the outer profile size of each supporting leg steel plate before expanding outwardly of toroidal membrane one side.
Described supporting leg steel plate inserts soil layer when expansion is rotated in the pile tube outside a lateral edges is an acute angle shape.
The height of described expander is greater than its diameter.
Another prefabricated concrete pipe pile of the present invention expanding piling bar point, it comprises, annular endplate, the corresponding central through hole in its lower surface place connects one section steel pipe; On the annular endplate in twos symmetry, be crosswise and distribute and to have 4 through holes and corresponding bolts; At least two blocks of outside supporting leg steel plates of translation, rectangular, respectively offer one in its central axis and can pass slotted eye for bolt as the location pin key of its outside translation of constraint perpendicular to long limit; Toroidal membrane, on have the through hole of 4 corresponding annular endplate through holes, be connected in above-mentioned supporting leg steel plate upper surface by above-mentioned bolt; At least two blocks of outside supporting leg steel plates of translation, rectangular, respectively offer one in its central axis and can pass slotted eye for bolt as the location pin key of its outside translation of constraint perpendicular to long limit; Be connected in the left and right sides of above-mentioned toroidal membrane upper surface respectively by above-mentioned bolt and corresponding nut; Expander, bullet is arranged in the steel pipe of the bottom sealing under the annular endplate, and its bottom external diameter is greater than the central through hole of annular endplate, toroidal membrane; Connect a steel cable on the expander.
The inside and outside contour of the inside and outside contour size of described annular endplate, toroidal membrane and prefabricated concrete pipe pile steel end plate is measure-alike.
The outer profile size of each supporting leg steel plate before expanding outwardly that is positioned at toroidal membrane one side is identical with the outer profile size of prefabricated concrete pipe pile steel end plate.
Described supporting leg steel plate inserts soil layer when expansion is rotated in the pile tube outside a lateral edges is an acute angle shape.
The height of described expander is greater than its diameter.
Have again, the prefabricated concrete pipe pile of the present invention piling construction method of expanding piling bar point, it comprises the steps:
3) before sinking to prefabricated concrete pipe pile, 4 bolts of piling bar point are connected with the corresponding internal thread of steel end plate of pile tube lowermost end, expander is placed in the steel pipe under the annular endplate, the steel cable of company of system expander passes the slit between annular endplate, toroidal membrane and each the supporting leg steel plate, and the pile tube endoporus causes the pile tube top;
4) after requiring the degree of depth, promote steel cable sinking to prefabricated concrete pipe pile, steel cable affects expander each the supporting leg steel plate in the pushing tow piling bar point that makes progress, also with the outside pushing tow of each supporting leg steel plate, make each supporting leg steel plate in expansion of the pile tube outside and insertion outside soil layer simultaneously.
Beneficial effect of the present invention
1) cone expander, hawser and lifting appliance simple structure promote the combination of hawser and cone expander pushing tow supporting leg steel plate after sinking to prefabricated concrete pipe pile, make it in expansion of the pile tube outside and insertion outside soil layer.
2) the expanding piling bar point of prefabricated concrete pipe pile can significantly improve the supporting effect of soil layer to stake, reaches the purpose of saving piling, reducing cost.
3) can be applied to prefabricated concrete pipe pile and prefabricated steel pipe concrete pipe pile at present commonly used, only need to connect expanding piling bar point of the present invention with bolt at the steel end plate place of the lowermost end of stake.
4) can utilize prefabricated concrete pipe pile pile sinking facility and technology commonly used at present to carry out piling construction.
Description of drawings
Fig. 1 is the structural representation of prefabricated concrete pipe pile of the present invention with expanding piling bar point first embodiment;
Fig. 2 is the STRUCTURE DECOMPOSITION schematic diagram of prefabricated concrete pipe pile of the present invention with expanding piling bar point first embodiment;
Fig. 3 is the expansion preceding schematic diagram of prefabricated concrete pipe pile of the present invention with expanding piling bar point first embodiment;
Fig. 4 is prefabricated concrete pipe pile of the present invention schematic diagram after with the expansion of expanding piling bar point first embodiment;
The schematic diagram that Fig. 5 is connected with pile tube with expanding piling bar point first embodiment for prefabricated concrete pipe pile of the present invention;
Fig. 6 is the structural representation of prefabricated concrete pipe pile of the present invention with expanding piling bar point second embodiment;
Fig. 7 is the STRUCTURE DECOMPOSITION schematic diagram of prefabricated concrete pipe pile of the present invention with expanding piling bar point second embodiment;
Fig. 8 is the expansion preceding schematic diagram of prefabricated concrete pipe pile of the present invention with expanding piling bar point second embodiment;
Fig. 9 is prefabricated concrete pipe pile of the present invention schematic diagram after with the expansion of expanding piling bar point second embodiment;
Figure 10 is the sectional drawing of prefabricated concrete pipe pile before the expansion of second embodiment of the invention piling bar point;
Figure 11 is the sectional drawing of second embodiment of the invention piling bar point expansion back prefabricated concrete pipe pile.
The specific embodiment
Referring to Fig. 1～Fig. 5, prefabricated concrete pipe pile of the present invention expanding piling bar point first embodiment, it comprises, annular endplate 1, the corresponding central through hole in its lower surface 101 places connect the steel pipe 2 of one section bottom sealing; 2 blocks of supporting leg steel plates 3 that can outwards rotate, one end are respectively by 2 bolts 4 ", 4 " ' be movably connected on left and right sides of the upper surface of described annular endplate 1; Toroidal membrane 5, by 4 bolts 4,4 ', 4 ", 4 " ' be connected in above-mentioned supporting leg steel plate 3 upper surfaces; 2 blocks of supporting leg steel plates 6 that can outwards rotate are movably connected on the left and right sides of above-mentioned toroidal membrane 5 upper surfaces respectively by 2 bolts 4,4 '; Expander 7, bullet is arranged in the steel pipe 2 of the bottom sealing under the annular endplate 1, and its bottom external diameter is less than the central through hole of annular endplate 1, toroidal membrane 5; Connect a steel cable 8 on the expander 7.
Again, the inside and outside contour of the inside and outside contour size of described annular endplate 1, toroidal membrane 5 and prefabricated concrete pipe pile 9 steel end plates 10 is measure-alike, and its profile is a donut, or the annular of square-outside and round-inside.
Further, be positioned at each supporting leg steel plate 3 of annular endplate 1 one sides and to be positioned at the overall outer profile size of each supporting leg steel plate 6 before expanding outwardly of toroidal membrane 5 one sides identical with the outer profile size of prefabricated concrete pipe pile 9 steel end plates 10.
Described supporting leg steel plate 3 and supporting leg steel plate 6 insert soil layer when expansion is rotated in pile tube 9 outsides a lateral edges is an acute angle shape.
The height of described expander 7 is greater than its diameter.
Referring to Fig. 1～Fig. 4, the prefabricated concrete pipe pile of the present invention piling construction method of expanding piling bar point, it comprises the steps:
1. before sinking to prefabricated concrete pipe pile 9, by 4 bolts 4,4 ', 4 ", the 4 " ' piling bar point is connected with the steel end plate 10 corresponding internal threads of pile tube 9 lowermost ends, expander 7 is placed in the steel pipe 2 under the annular endplate 1,
2. be that the steel cable 8 that connects expander 7 passes the slit between annular endplate 1, toroidal membrane 5 and each the supporting leg steel plate 3,6,13, and pile tube 9 endoporus cause pile tube 9 tops;
3. after requiring the degree of depth, promote steel cable 8 sinking to prefabricated concrete pipe pile 9, steel cable 8 affects upwards each supporting leg steel plate 3,6 in the pushing tow piling bar point of expander 7, also with each supporting leg steel plate 3,6 outside pushing tow, make each supporting leg steel plate 3,6 in expansion and insertion outside soil layer are rotated in pile tube 9 outsides simultaneously.
Referring to Fig. 6～Figure 11, prefabricated concrete pipe pile of the present invention second embodiment of expanding piling bar point, it comprises, annular endplate 14, the corresponding central through hole in its lower surface 1401 places connect one section steel pipe 15; On the annular endplate 14 in twos symmetry, be crosswise distribute have 4 through holes 1402 and corresponding 4 bolts 16,16 ', 16 ", 16 " '; 2 can be outwards movable supporting leg steel plate 17, rectangular, respectively offer one its flat shape in the central axis of minor face and can pass slotted eye 1701 for bolt 16,16 ' as the location pin key of its outside translation of constraint; Toroidal membrane 18, on have the through hole 1801 of 4 corresponding annular endplate 14 through holes 1402, by above-mentioned bolt 16,16 ', 16 ", 16 " ' be connected in above-mentioned supporting leg steel plate 17 upper surfaces; 2 blocks of supporting leg steel plates 19 that can outwards rotate, rectangular, respectively offer a slotted eye 1901 that can pass the location pin key of its outside translation of conduct constraint its flat shape in the central axis of minor face for bolt; Respectively by above-mentioned bolt 16 ", 16 " ' the be connected in both sides of above-mentioned toroidal membrane 18 upper surfaces; Expander 20, bullet is arranged in the steel pipe 15 of the bottom sealing under the annular endplate 14, and its bottom external diameter is less than the central through hole of annular endplate 14, toroidal membrane 18; Connect a steel cable 21 on the expander 20.
The inside and outside contour of the inside and outside contour size of described annular endplate 14, toroidal membrane 18 and prefabricated concrete pipe pile 9 steel end plates 10 is measure-alike.
The overall outer profile size of each supporting leg steel plate 17,19 before expanding outwardly that is positioned at toroidal membrane 18 1 sides is identical with the outer profile size of prefabricated concrete pipe pile 9 steel end plates 10.
Described supporting leg steel plate 17,19 inserts soil layer when pile tube 9 outside translations are expanded a lateral edges is an acute angle shape.
The height of described expander 20 is greater than its diameter.
The prefabricated concrete pipe pile of the present invention piling construction method of expanding piling bar point, it comprises the steps:
1. before sinking to prefabricated concrete pipe pile 9, by 4 bolts 16,16 ', 16 ", the 16 " ' piling bar point is connected with the steel end plate 10 corresponding internal threads of pile tube 9 lowermost ends, expander 20 is placed in the steel pipe 15 that the bottom under the annular endplate 14 seals,
2. be that the steel cable 21 that connects expander 20 passes the slit between annular endplate 14, toroidal membrane 18 and each the supporting leg steel plate 17,19, and pile tube 9 endoporus cause pile tube 9 tops;
3. after requiring the degree of depth, promote steel cable 21 sinking to prefabricated concrete pipe pile 9, steel cable 21 affects upwards each supporting leg steel plate 17,19 in the pushing tow piling bar point of expander 20, also with each supporting leg steel plate 17,19 outside pushing tow, make each supporting leg steel plate 17,19 in pile tube 9 outside translation expansions and insertion outside soil layer simultaneously.
Claims (12)
1. prefabricated concrete pipe pile is characterized in that with expanding piling bar point, comprise,
Annular endplate, the corresponding central through hole in its lower surface place connects the steel pipe of one section bottom sealing;
At least two can be outwards movable supporting leg steel plate, the one end is movably connected on the left and right sides of the upper surface of described annular endplate respectively by bolt;
Toroidal membrane is connected in above-mentioned supporting leg steel plate upper surface by above-mentioned bolt;
At least two can be outwards movable supporting leg steel plate, be movably connected on the both sides of above-mentioned toroidal membrane upper surface respectively by above-mentioned bolt;
Expander, bullet is arranged in the steel pipe of the bottom sealing under the annular endplate, and its bottom external diameter is less than the central through hole of annular endplate, toroidal membrane; Connect a steel cable on the expander.
2. prefabricated concrete pipe pile is characterized in that with expanding piling bar point, comprise,
Annular endplate, the corresponding central through hole in its lower surface place connects one section steel pipe;
At least two blocks of supporting leg steel plates that can outwards rotate, the one end is movably connected on the left and right sides of the upper surface of described annular endplate respectively by bolt;
Toroidal membrane is connected in above-mentioned supporting leg steel plate upper surface by above-mentioned bolt;
At least two blocks of supporting leg steel plates that can outwards rotate are movably connected on the both sides of above-mentioned toroidal membrane upper surface respectively by above-mentioned bolt;
Expander, bullet is arranged in the steel pipe of the bottom sealing under the annular endplate, and its bottom external diameter is less than the central through hole of annular endplate, toroidal membrane; Connect a steel cable on the expander.
3. prefabricated concrete pipe pile as claimed in claim 2 expanding piling bar point, it is characterized in that, the inside and outside contour of the inside and outside contour size of described annular endplate, toroidal membrane and prefabricated concrete pipe pile steel end plate is measure-alike, and its profile is a donut, or the annular of square-outside and round-inside.
4. prefabricated concrete pipe pile as claimed in claim 2 is characterized in that with expanding piling bar point the overall outer profile size of each supporting leg steel plate before expanding outwardly that is positioned at toroidal membrane one side is identical with the outer profile size of prefabricated concrete pipe pile steel end plate.
5. prefabricated concrete pipe pile as claimed in claim 2 is characterized in that with expanding piling bar point described supporting leg steel plate inserts soil layer when expansion is rotated in the pile tube outside a lateral edges is an acute angle shape.
6. prefabricated concrete pipe pile as claimed in claim 2 is characterized in that with expanding piling bar point the height of described expander is greater than its diameter.
7. prefabricated concrete pipe pile is characterized in that with expanding piling bar point, comprise,
Annular endplate, the corresponding central through hole in its lower surface place connects one section steel pipe; On the annular endplate in twos symmetry, be crosswise and distribute and to have 4 through holes and corresponding bolts;
At least two blocks of outside supporting leg steel plates of translation respectively offer one in its central axis perpendicular to long limit and can pass slotted eye as the location pin key of its outside translation of constraint for bolt;
Toroidal membrane, on have the through hole of 4 corresponding annular endplate through holes, be connected in above-mentioned supporting leg steel plate upper surface by above-mentioned bolt;
At least two blocks of outside supporting leg steel plates of translation respectively offer one in its central axis perpendicular to long limit and can pass slotted eye as the location pin key of its outside translation of constraint for bolt; Be connected in the left and right sides of above-mentioned toroidal membrane upper surface respectively by above-mentioned bolt and respective nut;
Expander, bullet is arranged in the steel pipe under the annular endplate, and its bottom external diameter is greater than the central through hole of annular endplate, toroidal membrane; Connect a steel cable on the expander.
8. prefabricated concrete pipe pile as claimed in claim 7 is characterized in that with expanding piling bar point the inside and outside contour of the inside and outside contour size of described annular endplate, toroidal membrane and prefabricated concrete pipe pile steel end plate is measure-alike.
9. prefabricated concrete pipe pile as claimed in claim 7 is characterized in that with expanding piling bar point the overall outer profile size of each supporting leg steel plate before expanding outwardly that is positioned at toroidal membrane one side is identical with the outer profile size of prefabricated concrete pipe pile steel end plate.
10. prefabricated concrete pipe pile as claimed in claim 7 is characterized in that with expanding piling bar point described supporting leg steel plate inserts soil layer when expansion is rotated in the pile tube outside a lateral edges is an acute angle shape.
11. prefabricated concrete pipe pile as claimed in claim 7 is characterized in that with expanding piling bar point the height of described expander is greater than its diameter.
12. as the piling construction method of claim 1 or 2 or 7 described prefabricated concrete pipe piles usefulness expanding piling bar points, it comprises the steps:
1) before sinking to prefabricated concrete pipe pile, the piling bar point is connected with the steel end plate of pile tube lowermost end, expander is placed in the steel pipe of the bottom sealing under the annular endplate, the steel cable of company of system expander passes the slit between annular endplate, toroidal membrane and each the supporting leg steel plate, and the pile tube endoporus causes the pile tube top;
2) after requiring the degree of depth, promote steel cable sinking to prefabricated concrete pipe pile, steel cable affects expander each the supporting leg steel plate in the pushing tow piling bar point that makes progress, also with the outside pushing tow of each supporting leg steel plate, make each supporting leg steel plate in expansion of the pile tube outside and insertion outside soil layer simultaneously.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010166041 CN102235003B (en) | 2010-04-29 | 2010-04-29 | Expanded steel pile tip for prefabricated concrete tubular pile and pile sinking construction method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010166041 CN102235003B (en) | 2010-04-29 | 2010-04-29 | Expanded steel pile tip for prefabricated concrete tubular pile and pile sinking construction method |
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| CN102235003A true CN102235003A (en) | 2011-11-09 |
| CN102235003B CN102235003B (en) | 2013-04-24 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104652429A (en) * | 2014-12-30 | 2015-05-27 | 河南省建筑设计研究院有限公司 | Connection device for concrete hollow pile and steel pile head |
| CN105134288A (en) * | 2015-09-25 | 2015-12-09 | 中国矿业大学 | Hole dredging device and method for isolated grouting drill hole in mining overburden rock |
| CN111042128A (en) * | 2019-12-31 | 2020-04-21 | 常熟浦发第二热电能源有限公司 | Manufacturing method of anchor rod, anchor rod and application of anchor rod |
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| JP3575005B2 (en) * | 2001-01-17 | 2004-10-06 | 兼松日産農林株式会社 | Construction method of expanded steel pipe and expanded steel pipe pile |
| CN101649613A (en) * | 2009-09-03 | 2010-02-17 | 周治国 | Enlarged head prestress tubular pile and construction method thereof |
| CN201713813U (en) * | 2010-04-29 | 2011-01-19 | 宝山钢铁股份有限公司 | Expansion section steel pile tip for precast concrete pipe pile |
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| JPS63184614A (en) * | 1987-01-28 | 1988-07-30 | Giken Seisakusho:Kk | Method and apparatus for penetration of steel tubular pile |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104652429A (en) * | 2014-12-30 | 2015-05-27 | 河南省建筑设计研究院有限公司 | Connection device for concrete hollow pile and steel pile head |
| CN105134288A (en) * | 2015-09-25 | 2015-12-09 | 中国矿业大学 | Hole dredging device and method for isolated grouting drill hole in mining overburden rock |
| CN111042128A (en) * | 2019-12-31 | 2020-04-21 | 常熟浦发第二热电能源有限公司 | Manufacturing method of anchor rod, anchor rod and application of anchor rod |
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| CN102235003B (en) | 2013-04-24 |
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