CN113404433B - Impact hammer drill bit for resisting inclined hard rock stratum - Google Patents
Impact hammer drill bit for resisting inclined hard rock stratum Download PDFInfo
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- CN113404433B CN113404433B CN202110736425.9A CN202110736425A CN113404433B CN 113404433 B CN113404433 B CN 113404433B CN 202110736425 A CN202110736425 A CN 202110736425A CN 113404433 B CN113404433 B CN 113404433B
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- 239000011435 rock Substances 0.000 title claims abstract description 43
- 239000000956 alloy Substances 0.000 claims abstract description 135
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 135
- 238000010276 construction Methods 0.000 abstract description 6
- 238000005553 drilling Methods 0.000 abstract description 3
- 230000015572 biosynthetic process Effects 0.000 description 9
- 238000005755 formation reaction Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/36—Percussion drill bits
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention belongs to the technical field of bored piles, and discloses a hammer drill bit for resisting an inclined hard rock stratum, which aims to solve the problems of long construction period and high construction cost caused by repeated impact drilling and repeated backfill of rubble when the conventional hammer drill bit impacts the inclined hard rock stratum. The impact hammer comprises an impact hammer body, wherein the impact hammer body is provided with an impact hammer bottom surface with a cross-shaped edge, and the impact hammer is characterized in that at least one alloy block layer is arranged on the impact hammer bottom surface, each alloy block layer comprises 4 alloy blocks, the 4 alloy blocks are distributed along the direction of the cross-shaped edge, an included angle formed by the corner of the lower end surface of each alloy block on the alloy block layer, which faces the outer edge side of the impact hammer bottom surface, and the outer edge of the impact hammer bottom surface is the same as the inclination angle of an inclined hard rock stratum in a stratum, and the length of each alloy block in each alloy block is smaller than the radius of the impact hammer bottom surface.
Description
Technical Field
The invention belongs to the technical field of bored piles, and particularly relates to a hammer drill bit for resisting an inclined hard rock stratum.
Background
Although the bored concrete pile has extensive applicability in various stratum, heavy drill bit (heavy drill bit is provided with a drill blade, also called a hammer) of the impact drilling machine for forming holes is easy to punch along an inclined plane when entering into a rock and meets a hard inclined stratum, pile position deviation occurs at the bottom of the hole, so that the quality of a pile body is unqualified, and the bearing capacity of a pile foundation is also influenced.
Although common treatment measures are: the backfill rubble is re-punched, but the effect is very small, the backfill rubble is still easy to deviate when being punched to the inclined hard rock stratum again, and the backfill rubble re-punching measure is required to be repeated frequently and repeatedly, so that the material and the construction period are greatly influenced.
Disclosure of Invention
The invention provides a hammer drill bit for resisting an inclined hard rock stratum, which aims to solve the problems of long construction period and high construction cost caused by repeated backfill of rubble and repeated impact drilling when the conventional hammer drill bit impacts the inclined hard rock stratum.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a ram drill bit for resisting oblique hard rock, includes the ram body, the ram body has the ram bottom surface that is "cross" sword, its characterized in that, install at least one alloy piece layer on the ram bottom surface, each alloy piece layer all includes 4 alloy pieces, 4 alloy pieces are arranged along the direction of "cross" sword, the corner that the lower terminal surface of alloy piece on each alloy piece layer orientation ram bottom surface outward flange side and the inclination of the oblique hard rock in the stratum that the outer flange of ram bottom surface formed are the same, the length of each alloy piece in each alloy piece is less than the radius of ram bottom surface.
In some embodiments, the width of the alloy pieces in the layer of alloy pieces is equal to or less than the width of the narrowest of the cross-shaped edges.
In some embodiments, when at least two layers of the alloy block are mounted on the ram bottom surface, each layer of the alloy block is arranged in sequence from top to bottom along the ram bottom surface; and the length of each alloy lump in the upper alloy lump layer is greater than the length of each alloy lump in the lower alloy lump layer.
In some embodiments, when the inclination angle of the inclined hard formation in the formation is α <10 °, and the ram floor radius r >270mm, the ram floor is fitted with a layer of laminated block.
In some embodiments, when the inclination angle of the inclined hard rock layer in the formation is 10 ° < α <20 °, and the ram bottom surface radius r >270mm, two layers of the alloy lump layer are installed from top to bottom on the ram bottom surface.
In some embodiments, when the dip angle of the inclined hard formation in the formation is 20 ° < α <30 °, and the ram floor radius r >260mm, three layers of alloy lump layers are installed from top to bottom on the ram floor.
In some embodiments, when three alloy block layers are installed from top to bottom on the bottom surface of the hammer, the width of each alloy block in the uppermost alloy block layer is greater than the width of each alloy block in the alloy block layer of the intermediate layer, and the width of each alloy block in the alloy block layer of the intermediate layer is greater than or equal to the width of each alloy block in the alloy block layer of the lowermost layer.
Compared with the prior art, the invention has the following beneficial effects:
the impact hammer drill bit for resisting the inclined hard rock stratum can increase the rock entering capacity of the cross blade, the alloy blocks enable the drill bit to be more sharp, the impact strength is high under the same impact kinetic energy, and the rock stratum can be broken and opened in advance; when the inclined lithology interface is met, the concentrated stress part can be increased, so that the concentrated stress point is close to the center of the axis of the drill bit, and the deflection of the drill bit and the reduction of energy efficiency caused by uneven stress are reduced; when the rock is punched in, the alloy block is wear-resistant, and can bear most of the collision effect, so that the cross blade can be effectively protected. Therefore, the invention can solve the problem that the inclined hard rock stratum is easy to generate offset holes, and has the capability of rapid, efficient and economic rock breaking.
Drawings
Fig. 1 is a schematic structural view of an embodiment of the present invention, in which an alloy layer is disposed on a bottom surface of a hammer, wherein fig. 1 includes fig. 1A and fig. 1B, fig. 1A is a schematic structural view from below, and fig. 1B is a schematic structural view of a cross-sectional view of the bottom surface of the hammer; in the diagram, r represents the radius of the bottom surface of the hammer, α represents the inclination angle of the inclined hard rock layer in the stratum, a represents the length of each alloy block in the first alloy layer, d represents the thickness of each alloy layer in the alloy layer, and e represents the shortened distance of each layer (when only the first alloy block layer is present, e is the distance from the edge of the alloy block to the outer edge of the bottom surface of the hammer).
Fig. 2 is a schematic structural view of an embodiment of the present invention, in which a bottom surface of a hammer is provided with two alloy layers, wherein fig. 2 includes fig. 2A and fig. 2B, fig. 2A is a schematic structural view from below, and fig. 2B is a schematic structural view of a cross-sectional view of the bottom surface of the hammer; in the schematic diagram, r expresses the radius of the bottom surface of the hammer, alpha expresses the inclination angle of an inclined hard rock layer in a stratum, a expresses the length of each alloy block in a first alloy layer, b expresses the length of each alloy block in a second alloy layer, d expresses the thickness of each alloy layer in the alloy layers, and e expresses the shortened distance of each layer.
Fig. 3 is a schematic structural view of an embodiment of the present invention, in which a bottom surface of a hammer is provided with three alloy layers, wherein fig. 3 includes fig. 3A and fig. 3B, fig. 3A is a schematic structural view from below, and fig. 3B is a schematic structural view of a cross-sectional view of the bottom surface of the hammer; in the schematic diagram, r expresses the radius of the bottom surface of the hammer, alpha expresses the inclination angle of the inclined hard rock layer in the stratum, a expresses the length of each alloy block in the first alloy layer, b expresses the length of each alloy block in the second alloy layer, c expresses the length of each alloy block in the third alloy layer, d expresses the thickness of each alloy layer in the alloy layer, and e expresses the shortened distance of each layer.
Fig. 4 is a schematic view of a hammer drill during hole forming by impact, wherein fig. 4 includes fig. 4A and 4B, wherein fig. 4A is a schematic view of the hammer drill during hole forming by impact according to the present invention, fig. 4B is a schematic view of the hammer drill during hole forming by impact according to the prior art, and fig. 4A and 4B are rectangular dotted line boxes to show stress areas during impact, and comparison of fig. 4A and 4B can intuitively show that the stress areas are larger when an alloy block is mounted; wherein the stress area is: when the hammer bit impacts the hole, the contact area of the hammer bit and the bottom 5 of the pile hole 4.
The marks in the figure: 1. the bottom surface of the impact hammer, 2 alloy blocks, 3 an impact hammer body, 4 pile holes, 5 hole bottoms, 6 inclined hard rock layers, 7 stressed areas; 01. a first alloy block layer, 02, a second alloy block layer, 03 and a third alloy block layer.
Detailed Description
The present invention is further described below in conjunction with embodiments, which are merely some, but not all embodiments of the present invention. Based on the embodiments of the present invention, other embodiments that may be used by those of ordinary skill in the art without making any inventive effort are within the scope of the present invention.
In the description of the present application, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on the drawings, are merely for convenience of description of the present application and to simplify the description, and do not indicate or imply that the apparatus or elements to be referred to must have a specific direction, be configured and operated in the specific direction, and thus should not be construed as limiting the present application; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; may be a mechanical connection; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
The invention relates to a hammer drill bit for resisting inclined hard rock layers, which comprises a hammer body 3, wherein the hammer body 3 is provided with a hammer bottom surface 1 with a cross-shaped blade, and is characterized in that at least one alloy block layer is arranged on the hammer bottom surface 1, each alloy block layer comprises 4 alloy blocks 2,4 alloy blocks 2 which are arranged along the direction of the cross-shaped blade, and the included angle formed by the corner of the lower end surface of each alloy block 2 facing the outer edge side of the hammer bottom surface 1 and the outer edge of the hammer bottom surface 1 is the same as the inclined angle of the inclined hard rock layer 6 in the stratum, and the length of each alloy block 2 in each alloy block is smaller than the radius of the hammer bottom surface 1.
In some embodiments, the width of the alloy pieces 2 in the alloy piece layer is equal to or less than the width at which the cross edge is narrowest.
In some embodiments, when at least two alloy lump layers are mounted on the ram bottom surface 1, each alloy lump layer is arranged in order from top to bottom along the ram bottom surface 1, and the length of each alloy lump 2 in the upper alloy lump layer is greater than the length of each alloy lump 2 in the lower alloy lump layer.
In some embodiments, with reference to fig. 1, when the dip angle of the inclined hard formation in the formation is α <10 °, and the ram floor radius r >270mm, a layer of alloy nuggets is mounted to the ram floor.
In some embodiments, when the inclination angle of the inclined hard rock layer in the formation is 10 ° < α <20 °, and the ram bottom surface radius r >270mm, two laminated block layers are installed from top to bottom.
Referring to fig. 3, when the inclination angle of the inclined hard rock layer in the strata is 20 ° < α <30 °, and the radius r of the bottom surface of the ram is >260mm, three layers of alloy lump layers are installed from top to bottom.
In some embodiments, when three alloy lump layers are mounted on the hammer bottom surface 1 from top to bottom, the width of each alloy lump 2 in the uppermost alloy lump layer (i.e., the third alloy lump layer 03 in fig. 3B) is larger than the width of each alloy lump 2 in the intermediate alloy lump layer (i.e., the second alloy lump layer 02 in fig. 3B), and the width of each alloy lump 2 in the intermediate alloy lump layer is larger than or equal to the width of each alloy lump in the lowermost alloy lump layer (i.e., the first alloy lump layer 01 in fig. 3B).
The impact hammer drill bit for resisting the inclined hard rock stratum can increase the rock entering capacity of the cross blade, the alloy blocks enable the drill bit to be more sharp, the impact strength is high under the same impact kinetic energy, and the rock stratum can be broken and opened in advance; when the inclined lithology interface is met, a concentrated stress area (when the alloy block layer is arranged on the bottom surface of the impact hammer of the invention in comparison with the attached drawing 4A and the attached drawing 4B), the area of the stress area 7 is larger than that of the stress area 7 in the prior art, so that the concentrated stress point is close to the center of the axis of the drill bit, and the deflection of the drill bit and the reduction of energy efficiency caused by uneven stress are reduced; when the rock is punched in, the alloy block is wear-resistant, and can bear most of the collision effect, so that the cross blade can be effectively protected. Therefore, the invention can solve the problem that the inclined hard rock stratum is easy to generate offset holes, and has the capability of rapid, efficient and economic rock breaking.
Of these, the fixed length of each alloy lump 2 of the first alloy lump 01 of the present invention is most reasonable to be 100mm, and when the inclination α of the inclined hard rock layer and the thickness d of the alloy lump 2 are determined, the shortening distance e=d/tan α, the length b=a+e of each alloy lump 2 in the second alloy lump layer 02, and the length c=b+e of each alloy lump 2 in the third alloy lump layer 03 are shortened.
When the alloy block is welded on the bottom surface of the impact hammer in the traditional technology, the welding position of the alloy block is not calculated, only the capability of rapidly entering rock is achieved, only the rock stratum with a slight inclination (10 degrees) is effective, and the materials and effects are not maximized. However, in the actual site construction process, the rock stratum inclination angle is generally 5-30 degrees, and is respectively more than 30 degrees, so that a plurality of layers of alloy blocks are reasonably selected according to the inclination angle of an inclined hard rock stratum and the stress condition of the drill bit bottom, and the welding position of the alloy blocks is scientifically calculated. Thereby fully playing the role of the alloy block.
The drill bit of the present invention is not suitable for extremely inclined (> 30 °) formations. According to the principle requirement, when the inclination angle alpha of the inclined hard rock layer is larger than 30 degrees, the number of layers or thickness of the alloy block layer is required to be increased, and the welding stability and bending resistance of the whole alloy block layer are reduced along with the increase of the number of layers or thickness. The maximum thickening layer design should be controlled within three layers and the total thickness should not exceed 120mm.
Claims (1)
1. The hammer bit for resisting the inclined hard rock stratum comprises a hammer body, wherein the hammer body is provided with a hammer bottom surface with a cross-shaped blade, and is characterized in that at least two alloy block layers are arranged on the hammer bottom surface, and each alloy block layer is sequentially arranged from top to bottom along the hammer bottom surface; and the length of each alloy block in the upper alloy block layer is greater than the length of each alloy block in the lower alloy block layer; each alloy block layer comprises 4 alloy blocks, the 4 alloy blocks are distributed along the direction of the cross-shaped edge, and the width of the alloy block in the alloy block layer is smaller than or equal to the width of the narrowest part of the cross-shaped edge; the included angle formed by the corner of the lower end face of the alloy block on each alloy block layer, which faces to the outer edge side of the bottom face of the impact hammer, and the outer edge of the bottom face of the impact hammer is the same as the inclined angle of the inclined hard rock stratum in the stratum, and the length of each alloy block in each alloy block is smaller than the radius of the bottom face of the impact hammer; when the inclination angle of the inclined hard rock stratum in the stratum is 10 degrees < alpha <20 degrees and the radius r of the bottom surface of the impact hammer is more than 270mm, two laminated block layers are arranged on the bottom surface of the impact hammer from top to bottom; when the inclination angle of the inclined hard rock stratum in the stratum is 20 degrees < alpha <30 degrees and the radius r of the bottom surface of the impact hammer is more than 260mm, three layers of laminated block layers are arranged on the bottom surface of the impact hammer from top to bottom; when three alloy block layers are arranged on the bottom surface of the impact hammer from top to bottom, the width of each alloy block in the alloy block layer on the uppermost layer is larger than that of each alloy block in the alloy block layer on the middle layer, and the width of each alloy block in the alloy block layer on the middle layer is larger than or equal to that of each alloy block in the alloy block layer on the lowest layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110736425.9A CN113404433B (en) | 2021-06-30 | 2021-06-30 | Impact hammer drill bit for resisting inclined hard rock stratum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110736425.9A CN113404433B (en) | 2021-06-30 | 2021-06-30 | Impact hammer drill bit for resisting inclined hard rock stratum |
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| Publication Number | Publication Date |
|---|---|
| CN113404433A CN113404433A (en) | 2021-09-17 |
| CN113404433B true CN113404433B (en) | 2024-01-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110736425.9A Active CN113404433B (en) | 2021-06-30 | 2021-06-30 | Impact hammer drill bit for resisting inclined hard rock stratum |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB397144A (en) * | 1932-01-14 | 1933-08-14 | Joseph Robbins Curtis | Improvements in or relating to rock-drills |
| US6904984B1 (en) * | 2003-06-20 | 2005-06-14 | Rock Bit L.P. | Stepped polycrystalline diamond compact insert |
| CN204261738U (en) * | 2014-11-20 | 2015-04-15 | 吴中区光福金怡五金配件厂 | A kind of catalase hammer |
| CN104675325A (en) * | 2015-02-10 | 2015-06-03 | 陶德明 | Full-hydraulic down-hole rotating impact combined drill bit for piling rock and soil layer |
| CN213450269U (en) * | 2020-11-19 | 2021-06-15 | 中铁科学研究院有限公司 | Rectangular slide-resistant pile mechanical construction device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6672406B2 (en) * | 1997-09-08 | 2004-01-06 | Baker Hughes Incorporated | Multi-aggressiveness cuttting face on PDC cutters and method of drilling subterranean formations |
| CN103437341B (en) * | 2013-07-29 | 2015-08-26 | 中铁十六局集团北京轨道交通工程建设有限公司 | On cover effective forming construction method thereof of diaphragm wall in the micro-famp of sand |
-
2021
- 2021-06-30 CN CN202110736425.9A patent/CN113404433B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB397144A (en) * | 1932-01-14 | 1933-08-14 | Joseph Robbins Curtis | Improvements in or relating to rock-drills |
| US6904984B1 (en) * | 2003-06-20 | 2005-06-14 | Rock Bit L.P. | Stepped polycrystalline diamond compact insert |
| CN204261738U (en) * | 2014-11-20 | 2015-04-15 | 吴中区光福金怡五金配件厂 | A kind of catalase hammer |
| CN104675325A (en) * | 2015-02-10 | 2015-06-03 | 陶德明 | Full-hydraulic down-hole rotating impact combined drill bit for piling rock and soil layer |
| CN213450269U (en) * | 2020-11-19 | 2021-06-15 | 中铁科学研究院有限公司 | Rectangular slide-resistant pile mechanical construction device |
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| Publication number | Publication date |
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| CN113404433A (en) | 2021-09-17 |
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