CN220434692U - Circular cutting coring structure suitable for drilling hard rock stratum of large-diameter rotary-digging bored pile - Google Patents
Circular cutting coring structure suitable for drilling hard rock stratum of large-diameter rotary-digging bored pile Download PDFInfo
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- CN220434692U CN220434692U CN202322195228.8U CN202322195228U CN220434692U CN 220434692 U CN220434692 U CN 220434692U CN 202322195228 U CN202322195228 U CN 202322195228U CN 220434692 U CN220434692 U CN 220434692U
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- 239000011435 rock Substances 0.000 title claims abstract description 75
- 238000005553 drilling Methods 0.000 title claims abstract description 61
- 230000002093 peripheral effect Effects 0.000 claims description 8
- 230000015572 biosynthetic process Effects 0.000 claims description 7
- 238000009412 basement excavation Methods 0.000 claims description 3
- 238000005755 formation reaction Methods 0.000 claims 2
- 238000000034 method Methods 0.000 abstract description 11
- 238000010276 construction Methods 0.000 description 8
- 230000008901 benefit Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
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Abstract
The utility model relates to the technical field of large-diameter rotary-digging bored piles, and discloses a circular cutting coring structure suitable for drilling a hard rock layer of a large-diameter rotary-digging bored pile, which comprises a circular groove formed in the hard rock layer at the lower part of a bored pile hole, wherein the circular groove is circumferentially arranged along the circumferential direction of the bored pile hole, the hard rock layer is provided with a circular cutting section surrounded by the circular groove, and the circular cutting section is circumferentially separated from the hard rock layer through the circular groove; the annular section is provided with a plurality of coring holes drilled by the coring barrel, the plurality of coring holes are arranged along the Zhou Xiangyi sequence of the annular section, and adjacent coring holes are mutually meshed. In the process of forming holes of the large-diameter rotary-digging bored concrete pile, the annular groove is formed through the drilling tool, so that the complete rock surface at the middle and lower parts of the holes is changed into a free rock surface, a plurality of coring holes are drilled through the drilling tool conveniently, the drilling efficiency is improved, meanwhile, the side wall of the drilling tool can be abutted to a hard rock stratum through the annular groove in the drilling process of the coring holes, lateral support and guide are provided, the holes are effectively kept from deflecting, and the drilling quality is ensured.
Description
Technical Field
The utility model relates to the technical field of large-diameter rotary-digging bored concrete piles, in particular to a circular cutting coring structure suitable for drilling a hard rock layer of a large-diameter rotary-digging bored concrete pile.
Background
The large-diameter rotary-digging cast-in-place pile is an advanced pile foundation technology, is widely applied to the fields of construction, bridges, roads and the like, improves the bearing capacity, the construction efficiency, the economic benefit and the safety of engineering, and provides powerful support for the construction of modern engineering.
In the prior art, when a large-diameter rotary-digging cast-in-place pile drills in hard rock, a grading reaming drilling process is generally adopted. The technology takes the center of a pile hole as a base point, drills and cores by using a small-diameter drill bit to a designed elevation, and then gradually reams by replacing a bit with a slightly larger diameter drill bit until the pile hole is drilled to the designed pile diameter.
In the hard rock grading reaming, each stage of drilling uses a pile center point for reaming, and each stage of drill bit always uses complete hard rock as an object during drilling, so that the torque required by the hard rock drilling is increased along with the increase of the diameter of the grading drill bit, and the drilling efficiency is low; meanwhile, the drilling process needs to frequently replace the drill bit, and construction efficiency is affected. In addition, when the hard rock stratum has inclined rock surface or development cracks and broken zones, the small-diameter drill bit is not laterally supported in the hole in the process of entering the stratum by adopting the graded reamer, so that deflection is easy to occur, and the drilling quality is difficult to ensure.
Disclosure of Invention
The utility model aims to provide an annular cutting coring structure suitable for drilling hard rock stratum of a large-diameter rotary-excavation filling pile, and aims to solve the problem that in the prior art, the efficiency of drilling and coring of the hard rock stratum is low in the construction process of the large-diameter rotary-excavation filling pile.
The utility model is realized in such a way that the annular cutting coring structure is suitable for drilling the hard rock stratum of the large-diameter rotary-digging bored pile, and comprises an annular groove formed in the hard rock stratum at the lower part of the bored pile hole, wherein the annular groove is circumferentially arranged along the circumferential direction of the bored pile hole, the hard rock stratum is provided with an annular cutting section surrounded by the annular groove, and the annular cutting section is circumferentially separated from the hard rock stratum through the annular groove;
the annular section is provided with a plurality of coring holes drilled by the coring barrel, the plurality of coring holes are arranged along the Zhou Xiangyi sequence of the annular section, and adjacent coring holes are mutually meshed.
Optionally, the outer diameter of the ring groove is consistent with the diameter of the bored concrete pile hole.
Optionally, a plurality of the coring holes are arranged in a closed loop engagement along the circumference of the annular segment.
Optionally, the inner side of the coring hole is disposed toward the center of the annular segment, and the outer side of the coring hole penetrates the outer side of the annular segment to form an outer side opening.
Optionally, the bottom of the coring hole is arranged flush with the bottom of the ring groove.
Optionally, the annular segment has a plurality of outer Zhou Yanzhu, a plurality of the peripheral rock studs being spaced apart along the circumference of the annular segment and the peripheral rock studs being formed between adjacent outer openings.
Optionally, the inner sides of a plurality of the coring holes pass through the center of the annular segment.
Optionally, the inner side wall of the coring hole is biased outwards to the center of the annular section, a central rock column is formed at the center of the annular section, and a plurality of coring holes encircle the periphery of the central rock column.
Optionally, the depth of the ring groove is not less than 1.2m.
Optionally, a plurality of the coring holes are uniformly snap-fit arranged along the circumference of the ring segment.
Compared with the prior art ， The annular cutting coring structure suitable for drilling the hard rock layer of the large-diameter rotary-digging bored pile provided by the utility model has the advantages that in the process of forming the hole of the large-diameter rotary-digging bored pile, the annular groove is formed by the drilling tool, so that the complete rock surface at the middle and lower part of the hole is changed into a free rock surface, and the subsequent drilling by the drilling tool is facilitatedThe core holes are drilled, the drilling efficiency is improved, the side wall of the drilling tool can be abutted on the hard rock stratum through the annular groove in the process of drilling the core holes, lateral support and guide are provided, the holes are effectively kept from deflection, the drilling quality is ensured, and meanwhile, the core holes are drilled due to the hole distribution design of the core holes and the annular groove
Drawings
FIG. 1 is a schematic front view of a circular cutting coring structure suitable for large diameter rotary drilling bored concrete pile hard rock stratum drilling provided by the utility model;
FIG. 2 is a schematic front view of a circular cutting coring structure for large diameter rotary bored pile hard rock drilling provided by the utility model;
FIG. 3 is a schematic front view of a circular cutting coring structure for large diameter rotary bored pile hard rock drilling provided by the utility model;
fig. 4 is a construction schematic diagram of the ring groove construction provided by the utility model;
fig. 5 is a schematic view of the coring hole according to the present utility model.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
The implementation of the present utility model will be described in detail below with reference to specific embodiments.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present utility model, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc., based on the azimuth or positional relationship shown in the drawings, it is only for convenience of describing the present utility model and simplifying the description, but it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus terms describing the positional relationship in the drawings are merely illustrative and should not be construed as limitations of the present patent, and specific meanings of the terms described above may be understood by those skilled in the art according to specific circumstances.
Referring to fig. 1-5, a preferred embodiment of the present utility model is provided.
The circular cutting coring structure suitable for drilling the hard rock stratum of the large-diameter rotary-digging bored pile comprises a circular groove 110 formed in the hard rock stratum 100 at the lower part of a bored pile hole, wherein the circular groove 110 is circumferentially arranged along the circumferential direction of the bored pile hole, the hard rock stratum 100 is provided with a circular cutting section surrounded by the circular groove 110, and the circular cutting section is circumferentially separated from the hard rock stratum 100 through the circular groove 110;
the annular segment is provided with a plurality of coring holes 200 drilled and coring by the core barrel, the plurality of coring holes 200 are arranged along the Zhou Xiangyi sequence of the annular segment, and adjacent coring holes 200 are mutually meshed.
The annular cutting coring structure suitable for drilling the hard rock layer of the large-diameter rotary drilling bored concrete pile provided by the above is characterized in that in the process of forming the hole of the large-diameter rotary drilling bored concrete pile, the annular groove 110 is formed by the drilling tool, so that the complete rock surface at the middle and lower part of the hole is changed into a free rock surface, a plurality of coring holes 200 are conveniently drilled by the drilling tool, the drilling efficiency is improved, meanwhile, the side wall of the drilling tool can be abutted on the hard rock layer 100 through the annular groove 110 in the drilling process of the coring holes 200, lateral support and guide are provided, the hole forming is effectively kept not to deviate, and the drilling quality is ensured.
For ease of description, reference is made to fig. 4 and 5 for a schematic construction of a circular cut coring structure suitable for use in drilling a hard rock formation 100 of a large diameter rotary bored pile.
The outer diameter of the ring groove 110 corresponds to the diameter of the bored concrete pile hole. In this way, the ring groove 110 which has the same diameter as the bored concrete pile hole is firstly dug by the drilling tool, so that the rock stratum 100 part corresponding to the bored concrete pile hole is changed into a free rock surface, and the subsequent coring by the drilling tool is greatly improved to form the coring hole 200.
Specifically, the ring groove 110 is formed by rotary drilling with a roller cone drill 300 having a diameter identical to that of the bored concrete pile, and the coring hole 200 is formed by coring with a core drill 400 having a diameter smaller than that of the bored concrete pile.
The plurality of coring holes 200 are arranged in a closed loop engagement along the circumference of the ring segment. Thus, since the annular segment is annular, a plurality of round coring holes 200 are circumferentially disposed therein, such that the remaining portions of the plurality of rock columns are relatively similar and regular and sized for ease of calculation and control for ease of removal by a particular drilling tool.
The inside of the coring aperture 200 is disposed toward the center of the ring segment, and the outside of the coring aperture 200 extends through the outside of the ring segment, forming an outside opening. Thus, during formation of the coring aperture 200, a portion of the sidewall of the drill is positioned within the annular groove 110, and during rotary drilling of the drill, the sidewall thereof abuts the hard rock formation 100 through the annular groove 110, providing effective lateral support.
The bottom of the coring aperture 200 is disposed flush with the bottom of the ring groove 110. Thus, the rock surface of the hole bottom is smooth, and the subsequent process is convenient to continue digging or pouring concrete to form piles.
The annular segment has a plurality of peripheral rock studs 120, the plurality of peripheral rock studs 120 being spaced apart along the circumference of the annular segment, and the peripheral rock studs 120 being formed between adjacent outer side openings. Thus, after the coring holes 200 are formed by multiple drilling coring operations along the ring groove 110, the outer openings effectively divide the remaining ring segments into a plurality of regular and similarly sized outer segments Zhou Yanzhu for subsequent removal of the plurality of peripheral rock legs 120 by a single drill.
In this embodiment, referring to FIG. 3, the inner sides of the plurality of coring holes 200 pass through the center of the ring cut. Thus, the hole pattern is designed according to the strength of the rock formation 100, the set hole diameter and the drill diameter, and when the hole diameter is equal to or smaller than twice the drill diameter, as shown in the following figures, the middle part is completely cored out to be hollowed-out, so that only a plurality of rock columns arranged in the outer ring region are formed in the circular cut section.
In this embodiment, referring to FIG. 1, the inner side wall of the coring holes 200 is offset outwardly from the center of the annular segment, the center of which defines the central rock leg 130, and a plurality of coring holes 200 are circumferentially enclosed around the outer periphery of the central rock leg 130. Thus, the hole arrangement form is designed according to the strength of the rock formation 100, the set aperture and the diameter of the drilling tool, when the aperture is larger than twice the diameter of the drilling tool, as shown in the following, the middle part is completely cored out to be hollowed-out, so that only a plurality of rock columns arranged in the outer ring area are formed in the circular cutting section.
The depth of the ring groove 110 is not less than 1.2m. Thus, the core is easily broken when the drill is used for coring.
The plurality of coring holes 200 are uniformly snap-fit arranged along the circumference of the ring segment. In this way, it is ensured that after the coring holes 200 are formed, the rock column formed in the ring cut can be removed by a drill.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
Claims (10)
1. The circular cutting coring structure is suitable for drilling a hard rock layer of a large-diameter rotary-digging bored pile and is characterized by comprising a circular groove formed in the hard rock layer at the lower part of a bored pile hole, wherein the circular groove is circumferentially arranged along the circumferential direction of the bored pile hole, the hard rock layer is provided with a circular cutting section surrounded by the circular groove, and the circular cutting section is circumferentially separated from the hard rock layer through the circular groove;
the annular section is provided with a plurality of coring holes drilled by the coring barrel, the plurality of coring holes are arranged along the Zhou Xiangyi sequence of the annular section, and adjacent coring holes are mutually meshed.
2. The circular cutting coring structure for drilling hard rock of large-diameter rotary-digging bored pile according to claim 1, wherein the outer diameter of the circular groove is identical to the diameter of the bored pile hole.
3. A circular cutting coring structure adapted for use in the drilling of hard rock formations of large diameter rotary bored concrete piles as set forth in claim 1, wherein a plurality of said coring holes are arranged in a closed loop engagement along the circumference of the circular cutting section.
4. A circular cutting coring structure for large diameter rotary bored pile hard rock drilling as set forth in claim 1, wherein the inner side of the coring hole is disposed toward the center of the circular cutting section, and the outer side of the coring hole penetrates the outer side of the circular cutting section to form an outer side opening.
5. The circular cutting coring structure for drilling hard rock of large-diameter rotary-excavation bored pile according to claim 1, wherein the bottom of the coring hole is arranged flush with the bottom of the ring groove.
6. The cut-to-core structure for large diameter rotary bored concrete pile hard rock drilling of claim 4, wherein said cut-to-cut segment has a plurality of outer sides Zhou Yanzhu, a plurality of said peripheral rock columns being circumferentially spaced along the cut-to-cut segment and said peripheral rock columns being formed between adjacent outer side openings.
7. A circular cutting coring structure adapted for use in large diameter rotary bored pile hard rock drilling as set forth in claim 1, wherein the inner sides of a plurality of said coring holes pass through the center of the circular cutting section.
8. A circular cutting coring structure for large diameter rotary bored concrete pile hard rock drilling as set forth in claim 1, wherein said coring hole has an inner side wall outwardly offset from a center of a circular cutting section, said circular cutting section having a center rock pillar formed at a center thereof, a plurality of said coring holes surrounding an outer periphery of the center rock pillar.
9. A circular cutting coring structure adapted for use in the drilling of a hard rock layer of a large diameter rotary bored concrete pile according to any one of claims 1 to 8, wherein the depth of said circular groove is not less than 1.2m.
10. A circular cutting coring structure adapted for use in the drilling of hard rock formations of large diameter rotary bored concrete piles according to any one of claims 1 to 8, wherein a plurality of said coring holes are uniformly engaged in a circumferential direction of the circular cutting section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322195228.8U CN220434692U (en) | 2023-08-14 | 2023-08-14 | Circular cutting coring structure suitable for drilling hard rock stratum of large-diameter rotary-digging bored pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322195228.8U CN220434692U (en) | 2023-08-14 | 2023-08-14 | Circular cutting coring structure suitable for drilling hard rock stratum of large-diameter rotary-digging bored pile |
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| Publication Number | Publication Date |
|---|---|
| CN220434692U true CN220434692U (en) | 2024-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322195228.8U Active CN220434692U (en) | 2023-08-14 | 2023-08-14 | Circular cutting coring structure suitable for drilling hard rock stratum of large-diameter rotary-digging bored pile |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220434692U (en) |
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2023
- 2023-08-14 CN CN202322195228.8U patent/CN220434692U/en active Active
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