CN111255399A - Hard rock small drill array core drilling method for large-diameter rotary-digging cast-in-place pile - Google Patents
Hard rock small drill array core drilling method for large-diameter rotary-digging cast-in-place pile Download PDFInfo
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- CN111255399A CN111255399A CN202010040904.2A CN202010040904A CN111255399A CN 111255399 A CN111255399 A CN 111255399A CN 202010040904 A CN202010040904 A CN 202010040904A CN 111255399 A CN111255399 A CN 111255399A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/28—Enlarging drilled holes, e.g. by counterboring
Abstract
The invention discloses a hard rock small-drill array core drilling method for a large-diameter rotary-excavating cast-in-place pile, which belongs to a hard rock rotary-excavating construction method, wherein a large drill cylinder and a small drill cylinder with different diameters are adopted, the designed pile diameter of the cast-in-place pile is a millimeter, the diameter of the large drill cylinder is a millimeter, and the diameter of the small drill cylinder is between 0.3a and 0.55a millimeter; the construction steps of the drilling method comprise: s1, positioning the hard rock drilling rotary drilling rig; s2, preparing for drilling a small array hole of the rotary drilling rig; s3, sequentially drilling at least two core taking holes by using a small drill cylinder within the range of the designed pile diameter and fishing slag; s4, utilizing a large drill barrel to drill a core integrally and fishing slag within the range of the designed pile diameter; the problem of hierarchical reaming technology need be equipped with the rock drilling section of thick bamboo and the sediment of dragging for with a digging soon of multiple different diameters and bore the bucket, need frequently to change the drill bit among the drilling and the scarfing cinder process, increased the number of times of digging the brill of the rig soon, simultaneously, along with the increase of extension drill bit diameter, its moment of torsion in hard rock will also increase, creeps into inefficiency is solved.
Description
Technical Field
The invention relates to a hard rock rotary excavating construction method, in particular to a hard rock small-drill array core drilling method for a large-diameter rotary excavating cast-in-place pile.
Background
At present, for a large-diameter rotary-digging bored concrete pile with a diameter of 1500mm or more, a step-by-step reaming drilling process is usually adopted for drilling hard rock, namely, core taking and slag removing are adopted from a small diameter, the drilling diameter is gradually expanded in steps until the designed pile diameter is reached, as shown in fig. 1, the bored concrete pile with the diameter of 2800mm is rotary-dug into the hard rock, and step-by-step reaming construction is generally expanded from a small hole.
The grading reaming process needs to be provided with a plurality of rotary drilling barrels and slag salvaging drilling buckets with different diameters, drill bits need to be frequently replaced in the drilling and slag removing processes, the drilling times of the rotary drilling machine are increased, the drilling efficiency is directly influenced, meanwhile, along with the increase of the diameters of the drill bits of the extension machines, the torque of the extension machines in hard rock is increased, the drilling speed is low, and the drilling efficiency is low, so that the existing drilling machine process needs to be improved.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a hard rock small drill array core drilling method for a large-diameter rotary excavating cast-in-place pile, and aims to solve the technical problem.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a large-diameter rotary excavating bored concrete pile hard rock small drill array core drilling method adopts a large drill cylinder and a small drill cylinder with different diameters, the designed pile diameter of the bored concrete pile is a millimeter, the diameter of the large drill cylinder is a millimeter, and the diameter of the small drill cylinder is between 0.3a and 0.55a millimeter; the construction steps of the drilling method comprise: s1, positioning the hard rock drilling rotary drilling rig; s2, preparing for drilling a small array hole of the rotary drilling rig; s3, sequentially drilling at least two core taking holes by using a small drill cylinder within the range of the designed pile diameter and fishing slag; and S4, utilizing the large drill barrel to drill the core integrally and fishing the slag within the range of the designed pile diameter.
Preferably, in step S3, the coring holes are distributed in a circumferential array at the center of the pile diameter.
Preferably, the diameter of the small drill cylinder is between 0.45a millimeter and 0.55a millimeter when the compression strength of the hard rock is less than or equal to 40 Mpa.
Preferably, when the designed pile diameter of the cast-in-place pile is between 1500mm and 2800mm, the diameter of the small drill cylinder is between 800mm and 1400mm, and the larger the designed pile diameter of the cast-in-place pile, the larger the diameter of the selected small drill cylinder.
Preferably, when the designed pile diameter of the cast-in-place pile is 1500mm, 1800mm, 2200mm, 2500mm or 2800mm, the diameter of the corresponding small drill pipe is 800mm, 900mm, 1000mm, 1200mm or 1400mm in sequence.
Preferably, when the design pile diameter of the cast-in-place pile is 1800mm or more, at least three coring holes are sequentially drilled by the small drill in step S3.
Preferably, when the compression strength of the hard rock is more than 40MPa, the diameter of the small drill cylinder is between 0.35a millimeter and 0.55a millimeter.
Preferably, the diameter of the small drill cylinder is between 800mm and 1000mm when the designed pile diameter of the cast-in-place pile is between 1500mm and 2800 mm.
Preferably, when the designed pile diameter of the cast-in-place pile is 1500mm, 1800mm, 2200mm, 2500mm or 2800mm, the diameter of the corresponding small drill pipe is 800mm, 900mm, 1000mm, 800mm or 900mm in sequence.
Preferably, when the design pile diameter of the cast-in-place pile is 2400 mm to 3000 mm, at step S3, the small drill barrels drill at least seven coring holes in sequence.
The invention has the beneficial effects that:
1. the drilling torque of the hard rock is small, the torque is gradually increased in the later stage of the generally adopted grading reaming hard rock rotary drilling (namely the construction process mentioned in the background technology), the drilling speed is low, and the drilling efficiency is low, while the process of 'small drill array coring and large drill integral leveling' is adopted in the invention, the small-diameter small drill barrel is used for drilling and coring, the drilling is always in a small-torque state, the drilling speed of the hard rock is high, and the drilling efficiency is high;
2. the site management is optimized, the hard rock grading reaming drilling is adopted, various cutting teeth and slag salvaging drill bits with different diameters are required to be prepared, the using amount of the drill bits is very large, the hard rock drilling can be realized only by using two types of large and small drill bits by adopting the invention, the types and the number of the drill bits are greatly reduced, and the management of a construction site is optimized;
3. the pile forming cost is reduced, the pile forming progress is accelerated by adopting the drilling construction process, the investment of machines is reduced, and the construction cost is effectively reduced.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic representation of the steps of a prior art staged reaming construction method;
fig. 2 is a schematic view of the construction steps in embodiment 6 of the present invention.
Detailed Description
The conception, the specific structure, and the technical effects produced by the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the features, and the effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention. In addition, all the connection/connection relations referred to in the patent do not mean that the components are directly connected, but mean that a better connection structure can be formed by adding or reducing connection auxiliary components according to specific implementation conditions.
A large-diameter rotary-digging cast-in-place pile hard rock small-drill array core drilling method adopts a large drill cylinder and a small drill cylinder with different diameters, if the designed pile diameter required by the cast-in-place pile is set to be a millimeter, the diameter of the large drill cylinder is selected to be a millimeter, namely the diameter of the large drill cylinder is the same as the designed pile diameter.
The diameter of the small drill barrel is different according to the compression strength of hard rock and the designed pile diameter, and the diameter ranges from 0.3a to 0.55a millimeters.
The concrete construction steps comprise:
s1, positioning the hard rock drilling rotary drilling rig;
s2, preparing for drilling a small array hole of the rotary drilling rig;
s3, sequentially drilling at least two coring holes by using a small drill barrel within the range of the designed pile diameter and fishing slag, wherein the coring holes are distributed in a circle center circumferential array of the designed pile diameter;
and S4, utilizing the large drill barrel to drill the core integrally and fishing the slag within the range of the designed pile diameter.
In step S3, the coring holes are distributed in a circular array at the center of the pile diameter.
According to the situation during actual construction, the compression strength of hard rock is divided into two intervals of less than or equal to 40MPa and more than 40MPa, and small drill barrels with different diameters are used.
When the compressive strength of the hard rock is less than or equal to 40Mpa, the diameter of the small drill cylinder is between 0.45a millimeter and 0.55a millimeter, specifically, when the designed pile diameter of the cast-in-place pile is between 1500 millimeters and 2800 millimeters, the diameter of the small drill cylinder is between 800 millimeters and 1400 millimeters, and the larger the designed pile diameter of the cast-in-place pile is, the larger the diameter of the selected small drill cylinder is; when the designed pile diameter of the cast-in-place pile is larger than or equal to 1800mm, in step S3, the small drill barrels drill at least three coring holes in sequence.
When the compression strength of the hard rock is more than 40MPa, the diameter of the small drill cylinder is between 0.35a millimeter and 0.55a millimeter, and specifically, when the designed pile diameter of the cast-in-place pile is between 1500 millimeters and 2800 millimeters, the diameter of the small drill cylinder is between 800 millimeters and 1000 millimeters; when the designed pile diameter of the cast-in-place pile is 2400 mm to 3000 mm, in step S3, the small drill barrels drill at least seven coring holes in sequence.
The principle of the invention is as follows:
1. fast drilling with small torque drill bit
When the rotary drilling rig drills into hard rock, the larger the diameter of a drill bit is, the larger the resistance of the drill bit for overcoming the inner footage of the hard rock is, and the larger the required drilling torque is, the invention discloses a method for performing core drilling by adopting a small-diameter array, and the drilling rig per se is used for performing small-section drilling at a large torque, so that the drilling resistance in the hard rock is effectively overcome, and the drilling efficiency can be greatly accelerated;
2. crushing of face
When the step S3 is carried out, after the first coring hole is drilled by using the small drill barrel, when the second coring hole is drilled, the circle where the second coring hole is located and the circle where the first coring hole is located are overlapped, so that the second coring hole is easier to drill, a plurality of coring holes are drilled in an array mode, the rock entering difficulty of adjacent drill holes is reduced, and the drilling efficiency of subsequent coring holes is improved.
In the following, a plurality of embodiments will be listed according to different hard rock compressive strengths and design pile diameters respectively.
Example 1
In this embodiment, the diameter of the designed pile diameter is 1500mm, the compressive strength of the rock is less than or equal to 40MPa, the diameter of the selected large drill cylinder is 1500mm, and the diameter of the selected small drill cylinder is 800mm, in step S3, two coring holes are drilled and slag is removed by using the small drill cylinders in a circumferential array at the center of the circle where the designed pile diameter is located, and the circle where the two coring holes are located is tangent to the circle where the designed pile diameter is located.
Example 2
In this embodiment, the diameter of the designed pile diameter is 1800mm, the compressive strength of the rock is less than or equal to 40MPa, the diameter of the selected large drill cylinder is 1800mm, and the diameter of the selected small drill cylinder is 900mm, in step S3, three coring holes are drilled and slag is removed by using the small drill cylinders in a circumferential array at the center of the circle where the designed pile diameter is located, and the circle where the three coring holes are located is tangent to the circle where the designed pile diameter is located.
Example 3
In this embodiment, the diameter of the designed pile diameter is 2200mm, the compressive strength of the rock is less than or equal to 40MPa, the diameter of the selected large drill cylinder is 2200mm, and the diameter of the selected small drill cylinder is 1000mm, in step S3, three coring holes are drilled in a circumferential array at the center of the circle where the designed pile diameter is located by using the small drill cylinders, and slag is removed, and the circle where the three coring holes are located is tangent to the circle where the designed pile diameter is located.
Example 4
In this embodiment, the diameter of the designed pile diameter is 2500mm, the compressive strength of the rock is less than or equal to 40MPa, the diameter of the selected large drill cylinder is 2500mm, and the diameter of the selected small drill cylinder is 1200mm, in step S3, three coring holes are drilled and slag is removed by using the small drill cylinders in a circumferential array at the center of the circle where the designed pile diameter is located, and the circle where the three coring holes are located is tangent to the circle where the designed pile diameter is located.
Example 5
In this embodiment, the diameter of the designed pile diameter is 2800mm, the compressive strength of the rock is less than or equal to 40MPa, the diameter of the selected large drill cylinder is 2800mm, and the diameter of the selected small drill cylinder is 1400mm, in step S3, two coring holes are drilled and slag is removed in a circumferential array at the center of the circle where the designed pile diameter is located by using the small drill cylinders, and the circle where the two coring holes are located is tangent to the circle where the designed pile diameter is located.
Example 6
As shown in fig. 2, in this embodiment, the diameter of the designed pile diameter is 1500mm, the compressive strength of the rock is greater than 40MPa, the diameter of the selected large drill cylinder is 1500mm, and the diameter of the selected small drill cylinder is 800mm, in step S3, three coring holes are drilled and slag is removed in a circumferential array at the center of the circle where the designed pile diameter is located by using the small drill cylinders, and the circle where the three coring holes are located is tangent to the circle where the designed pile diameter is located.
The numbers in fig. 2 represent a preferred sequence for drilling the coring holes.
Example 7
In this embodiment, the diameter of the designed pile diameter is 1800mm, the compressive strength of the rock is greater than 40MPa, the diameter of the selected large drill cylinder is 1800mm, and the diameter of the selected small drill cylinder is 900mm, in step S3, the small drill cylinders are used to drill four coring holes in a circle center circumferential array of the circle where the designed pile diameter is located, and drag slag, and the circle where the four coring holes are located is tangent to the circle where the designed pile diameter is located.
Example 8
In this embodiment, the diameter of the designed pile diameter is 2200mm, the compressive strength of the rock is greater than 40MPa, the diameter of the selected large drill cylinder is 2200mm, and the diameter of the selected small drill cylinder is 1000mm, in step S3, four coring holes are drilled in the circular array of the center of the circle where the designed pile diameter is located by using the small drill cylinders, and slag is removed, and the circle where the four coring holes are located is tangent to the circle where the designed pile diameter is located.
Example 9
In this embodiment, the diameter of the designed pile diameter is 2500mm, the compressive strength of the rock is greater than 40MPa, the diameter of the selected large drill cylinder is 2500mm, and the diameter of the small drill cylinder is 800mm, in step S3, seven coring holes are drilled and slag is fished out by using the small drill cylinders in a circumferential array at the center of the circle where the designed pile diameter is located, wherein the circle where six coring holes are located is tangent to the circle where the designed pile diameter is located, and the center of the circle where the remaining coring hole is located coincides with the center of the circle where the designed pile diameter is located.
Example 10
In this embodiment, the diameter of the designed pile diameter is 2800mm, the compressive strength of the rock is greater than 40MPa, the diameter of the selected large drill cylinder is 2800mm, and the diameter of the selected small drill cylinder is 900mm, in step S3, seven coring holes are drilled and slag is fished out by using the small drill cylinders in a circumferential array at the center of the circle where the designed pile diameter is located, wherein the circle where six coring holes are located is tangent to the circle where the designed pile diameter is located, and the center of the circle where the remaining coring hole is located coincides with the center of the circle where the designed pile diameter is located.
The above 10 embodiments are data provided for 5 different designed pile diameters and 2 different rock compressive strength ranges, respectively, and the data includes selecting small drill cylinders with different diameters for different situations, and the number of coring holes drilled by the small drill cylinders in step S3 for different situations, and the data are combined to form a table as follows.
Watch-array hole distribution mode
Wherein the numbers in the hole arrangement represent the preferred drilling sequence.
The requirements for the "return footage control" are as follows.
According to the diameter of an array hole (core taking hole), the compressive strength of the hard rock and the form (cutting tooth or cone) of the rotary drilling barrel drill bit used in the hard rock drilling, the drilling footage of a general array small drill is controlled to be 1.0-1.4 m, and the drilling footage of a large-section whole drill is controlled to be 1.0 m.
Compared with the existing grading reaming hard rock rotary drilling construction method, the hard rock small drill array core drilling method for the large-diameter rotary drilling cast-in-place pile has the following advantages:
1. the drilling torque of the hard rock is small
The hierarchical reaming hard rock that usually takes is dug soon and is bored later stage moment of torsion and increase gradually, and the drilling speed is slow, is crept into inefficiency, and the "little brill array coring that this patent adopted is bored whole shakeout" technology greatly, and the use is that the core is bored to the minor diameter pick section of thick bamboo, and it is in little moment of torsion state all the time to bore, and hard rock drilling speed is fast, it is efficient to bore.
2. Optimizes the field management
Adopt the hard rock to step the reaming and creep into, need prepare the pick of various different diameters and drag for the sediment drill bit, the use amount to the drill bit is very big, and adopt this patent technique then only need big, little two kinds of drill bits just can solve the hard rock and creep into, the kind and the quantity of the drill bit that has significantly reduced has optimized the management of job site.
3. Reduce the pile forming cost
By adopting the drilling construction process, the pile forming progress is accelerated, the machine investment is reduced, and the construction cost is effectively reduced.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A large-diameter rotary excavating bored concrete pile hard rock small drill array core drilling method adopts a large drill cylinder and a small drill cylinder with different diameters, and the designed pile diameter of the bored concrete pile is a millimeter, and is characterized in that the diameter of the large drill cylinder is a millimeter, and the diameter of the small drill cylinder is between 0.3a millimeter and 0.55a millimeter;
the construction steps of the drilling method comprise:
s1, positioning the hard rock drilling rotary drilling rig;
s2, preparing for drilling a small array hole of the rotary drilling rig;
s3, sequentially drilling at least two core taking holes by using a small drill cylinder within the range of the designed pile diameter and fishing slag;
and S4, utilizing the large drill barrel to drill the core integrally and fishing the slag within the range of the designed pile diameter.
2. The hard rock small drill array core drilling method for the large-diameter rotary excavating cast-in-place pile as claimed in claim 1, wherein in the step S3, the core holes are distributed in a circular array at the center of a circle of the designed pile diameter.
3. The hard rock small drill array coring drilling method of the large-diameter rotary excavating cast-in-place pile as claimed in claim 1, wherein when the compressive strength of the hard rock is less than or equal to 40Mpa, the diameter of the small drill cylinder is between 0.45a mm and 0.55a mm.
4. The hard rock small drill array coring drilling method for the large-diameter rotary excavating cast-in-place pile as claimed in claim 3, wherein when the designed pile diameter of the cast-in-place pile is 1500mm to 2800mm, the diameter of the small drill cylinder is 800mm to 1400mm, and the larger the designed pile diameter of the cast-in-place pile is, the larger the diameter of the selected small drill cylinder is.
5. The hard rock small drill array core drilling method for the large-diameter rotary excavating cast-in-place pile according to claim 4, wherein when the designed pile diameter of the cast-in-place pile is 1500mm, 1800mm, 2200mm, 2500mm or 2800mm, the diameters of the corresponding small drill cylinders are 800mm, 900mm, 1000mm, 1200mm or 1400mm in sequence.
6. The hard rock small drill array core drilling method for the large-diameter rotary excavating cast-in-place pile as claimed in claim 3, wherein when the designed pile diameter of the cast-in-place pile is larger than or equal to 1800mm, in step S3, the small drill barrels drill at least three core holes in sequence.
7. The hard rock small drill array coring drilling method of the large-diameter rotary excavating cast-in-place pile as claimed in claim 1, wherein when the compressive strength of the hard rock is greater than 40Mpa, the diameter of the small drill cylinder is between 0.35a mm and 0.55a mm.
8. The hard rock small drill array core drilling method for the large-diameter rotary excavating cast-in-place pile as claimed in claim 7, wherein when the designed pile diameter of the cast-in-place pile is between 1500mm and 2800mm, the diameter of the small drill cylinder is between 800mm and 1000 mm.
9. The hard rock small drill array core drilling method for the large-diameter rotary excavating cast-in-place pile according to claim 8, wherein when the designed pile diameter of the cast-in-place pile is 1500mm, 1800mm, 2200mm, 2500mm or 2800mm, the diameter of the corresponding small drill cylinders is 800mm, 900mm, 1000mm, 800mm or 900mm in sequence.
10. The hard rock small drill array core drilling method for the large-diameter rotary excavating cast-in-place pile as claimed in claim 7, wherein when the designed pile diameter of the cast-in-place pile is 2400 mm to 3000 mm, at step S3, the small drill barrels drill at least seven core holes in sequence.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010040904.2A CN111255399A (en) | 2020-01-15 | 2020-01-15 | Hard rock small drill array core drilling method for large-diameter rotary-digging cast-in-place pile |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010040904.2A CN111255399A (en) | 2020-01-15 | 2020-01-15 | Hard rock small drill array core drilling method for large-diameter rotary-digging cast-in-place pile |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112942378A (en) * | 2021-02-01 | 2021-06-11 | 何正勇 | Construction method for rotary drilling of superhard rock stratum |
| CN114837166A (en) * | 2022-05-18 | 2022-08-02 | 中铁六局集团有限公司 | Construction method of pile foundation for complex terrain geology in mountainous area |
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| JPH05163726A (en) * | 1991-12-17 | 1993-06-29 | Kawasaki Steel Corp | Erection of rotary penetration steel pipe pile |
| CN104264689A (en) * | 2014-09-03 | 2015-01-07 | 广东省基础工程公司 | Construction method for forming grooves and holes and replacing large-diameter piles with small-diameter piles |
| CN106759282A (en) * | 2016-12-30 | 2017-05-31 | 安徽省建筑科学研究设计院 | A kind of mechanical hole building method of super-large diameter hard rock bored concrete pile half |
| CN110344400A (en) * | 2019-07-17 | 2019-10-18 | 北京建材地质工程有限公司 | The hard rock pore-forming construction technology of churning driven opportunity |
-
2020
- 2020-01-15 CN CN202010040904.2A patent/CN111255399A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05163726A (en) * | 1991-12-17 | 1993-06-29 | Kawasaki Steel Corp | Erection of rotary penetration steel pipe pile |
| CN104264689A (en) * | 2014-09-03 | 2015-01-07 | 广东省基础工程公司 | Construction method for forming grooves and holes and replacing large-diameter piles with small-diameter piles |
| CN106759282A (en) * | 2016-12-30 | 2017-05-31 | 安徽省建筑科学研究设计院 | A kind of mechanical hole building method of super-large diameter hard rock bored concrete pile half |
| CN110344400A (en) * | 2019-07-17 | 2019-10-18 | 北京建材地质工程有限公司 | The hard rock pore-forming construction technology of churning driven opportunity |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112942378A (en) * | 2021-02-01 | 2021-06-11 | 何正勇 | Construction method for rotary drilling of superhard rock stratum |
| CN114837166A (en) * | 2022-05-18 | 2022-08-02 | 中铁六局集团有限公司 | Construction method of pile foundation for complex terrain geology in mountainous area |
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Application publication date: 20200609 |