CN111561262A - Hole forming method of rotary drilling rig for large-size pile hole in karst area - Google Patents
Hole forming method of rotary drilling rig for large-size pile hole in karst area Download PDFInfo
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- CN111561262A CN111561262A CN202010478022.4A CN202010478022A CN111561262A CN 111561262 A CN111561262 A CN 111561262A CN 202010478022 A CN202010478022 A CN 202010478022A CN 111561262 A CN111561262 A CN 111561262A
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- pile hole
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- hole
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- 238000005553 drilling Methods 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000010276 construction Methods 0.000 claims abstract description 36
- 230000005641 tunneling Effects 0.000 claims abstract description 36
- 239000011435 rock Substances 0.000 claims abstract description 8
- 230000002787 reinforcement Effects 0.000 claims description 20
- 230000001681 protective effect Effects 0.000 claims description 5
- 239000002689 soil Substances 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 3
- 235000019994 cava Nutrition 0.000 abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 5
- 239000002002 slurry Substances 0.000 abstract description 4
- 239000004927 clay Substances 0.000 abstract description 3
- 230000003628 erosive effect Effects 0.000 abstract description 3
- 230000003014 reinforcing effect Effects 0.000 abstract description 3
- 230000000903 blocking effect Effects 0.000 abstract 1
- 235000019738 Limestone Nutrition 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Classifications
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- 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
- E21B3/00—Rotary drilling
- E21B3/02—Surface drives for rotary drilling
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/06—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against corrosion by soil or water
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Geology (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to a pore-forming method of a rotary drilling rig for large-size pile holes in a karst area, which comprises the following steps: providing a rotary drilling rig and a tunneling drill bit, and enabling the tunneling drill bit to be larger than the diameter of a pile hole; starting a rotary drilling rig, drilling by using a tunneling drill bit, stopping drilling by using the tunneling drill bit when encountering an underground karst cave, backfilling and blocking the underground karst cave by using concrete, and then continuously drilling by using the tunneling drill bit until the preset depth of a preset pile hole is reached; by adopting the technical scheme of the invention, the once backfilling and reinforcing treatment is carried out on all karst caves encountered in the construction, the phenomena of slurry leakage, hole collapse and the like are effectively avoided, the semi-rock semi-flowing soft plastic red clay is prevented from flowing into the incompletely formed pile hole, the construction period is greatly shortened, the pile hole forming efficiency is improved, in addition, the rotary drilling rig and the forming drill bit are matched to construct on the inner wall of the pile hole to form the retaining wall, the erosion action of underground water on the pile foundation is effectively blocked, the bearing capacity of the pile foundation structure is ensured, and the durability of the pile foundation is enhanced.
Description
Technical Field
The invention belongs to the field of building construction, and particularly relates to a hole forming method of a rotary drilling rig for large-size pile holes in a karst area.
Background
The karst areas in China are widely distributed, many karsts exist in many areas, and the karst caves mainly have the phenomenon that limestone is gradually eroded under the action of water, acidic substances, microorganisms and the like to form cavities, so that the karst caves are basically arranged in places with the limestone. The pile foundation construction in the karst area is always a difficult problem which puzzles the engineering world, especially for a single-column single pile, the single pile bearing capacity is large, the phenomena of slurry leakage and hole collapse are frequently generated, sometimes even large-area ground collapse is generated, and the safety of constructors and mechanical equipment is endangered.
Disclosure of Invention
In order to solve the technical problem, the invention provides a hole forming method of a rotary drilling rig for large-size pile holes in a karst area.
The invention is realized by the following technical scheme.
The invention provides a pore-forming method of a rotary drilling rig for large-size pile holes in a karst area, which mainly comprises the following steps:
the method comprises the following steps: providing a rotary drilling rig, wherein a tunneling drill bit is arranged on the rotary drilling rig, and the outer diameter of the tunneling drill bit is larger than the diameter of a pile hole on a construction drawing which is drawn in advance;
step two: starting the rotary drilling rig, drilling to the ground through the tunneling drill bit in the first step, stopping the rotary drilling rig and taking out the tunneling drill bit when the pile hole is intersected with the underground karst cave in the process of enabling the tunneling drill bit to tunnel out rock and soil to form the pile hole, pouring concrete into the pile hole, and standing for 2 to 3 days after the concrete is solidified;
step three: and repeating the second step, and stopping the rotary drilling rig and taking out the tunneling drill bit when the drilling depth of the tunneling drill bit is consistent with the depth of the pile hole on the construction drawing which is drawn in advance.
The difference between the outer diameter of the tunneling drill bit and the diameter of the pile hole on the construction drawing which is drawn in advance is at least 300 mm.
And in the second step, the technological parameters for pouring concrete into the pile hole are as follows: and enabling the distance between the upper surface of the concrete poured in the pile hole and the upper edge of the underground karst cave entrance intersected with the pile hole to be larger than 300 mm.
The method for forming the hole by the rotary drilling rig for the large-size pile hole in the karst area further comprises the following steps:
after the third step is completed, preparing a reinforcement cage, wherein the outer diameter of the reinforcement cage is between the diameter of a pile hole on a pre-drawn construction drawing and the outer diameter of the tunneling drill bit, placing the reinforcement cage into the pile hole, pouring concrete along the inner wall of the pile hole until the pile hole is flush with the orifice of the pile hole, standing for 5 days after the concrete is solidified, installing a forming drill bit on the rotary drilling rig in the first step, wherein the outer diameter of the forming drill bit is consistent with the diameter of the pile hole on the pre-drawn construction drawing, starting the rotary drilling rig, drilling towards the ground through the forming drill bit, and stopping the rotary drilling rig and taking out the forming drill bit when the drilling depth of the forming drill bit is consistent with the depth of the pile hole on the pre-drawn construction drawing, so that the reinforcement cage and the poured concrete are.
The difference between the outer diameter of the steel reinforcement cage and the diameter of the pile hole on the construction drawing which is drawn in advance is at least 150 mm.
The method for forming the hole by the rotary drilling rig for the large-size pile hole in the karst area further comprises the following steps:
and after the reinforcement cage and the poured concrete are condensed together to form a retaining wall, manually removing all impurities in the pile hole.
The method for forming the hole by the rotary drilling rig for the large-size pile hole in the karst area further comprises the following steps:
and after the reinforcement cage and the poured concrete are condensed together to form a retaining wall, manually digging the wall of the pile hole and the bottom wall to enable the shape of the pile hole to be consistent with the shape of a pile hole pattern on a pre-drawn construction drawing.
The time interval between the formation time of the protective wall and the time interval between the stop of the rotary drilling rig and the taking out of the formed drill bit is at least 14 days.
And in the second step, the strength grade of the concrete is not lower than C15.
The invention has the beneficial effects that: by adopting the technical scheme of the invention, the underground rock soil is excavated by using the rotary drilling rig provided with the tunneling drill bit, the pile hole forming construction efficiency is greatly improved, the construction period is shortened, the tunneling drill bit is larger than the diameter of the pile hole, so that the once backfilling and reinforcing treatment can be conveniently carried out on all karst caves encountered in the construction, the phenomena of slurry leakage, hole collapse and the like are effectively avoided, meanwhile, the construction period is greatly shortened under the condition that half-rock semi-flow soft plastic red clay is prevented from flowing into incompletely formed hole piles, the pile hole forming efficiency is improved, and finally, the rotary drilling rig and the forming drill bit are matched to construct on the inner wall of the pile hole to form a protective wall, so that the erosion effect of underground water on the pile foundation is effectively blocked, the bearing capacity of the pile foundation structure is ensured, and the durability of the pile foundation is enhanced.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a flow chart of the construction process of the present invention.
In the figure: 1-pile hole, 2-underground karst cave and 3-protective wall.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.
As shown in fig. 1 and 2, the invention provides a method for forming a hole in a large-size pile hole rotary drilling rig in a karst region, which comprises the following steps:
the method comprises the following steps: providing a rotary drilling rig, wherein a tunneling drill bit is arranged on the rotary drilling rig, and the outer diameter of the tunneling drill bit is larger than the diameter of a pile hole 1 on a construction drawing which is drawn in advance; preferably, the difference between the outer diameter of the tunneling drill and the diameter of the pile hole 1 on the construction drawing which is drawn in advance is at least 300 mm.
Step two: starting the rotary drilling rig, drilling to the ground through the tunneling drill bit in the step one, stopping the rotary drilling rig and taking out the tunneling drill bit when the pile hole 1 is intersected with the underground karst cave 2 in the process that the tunneling drill bit is enabled to tunnel out rock and soil to form the pile hole 1, pouring concrete into the pile hole 1, and standing until the concrete is solidified for 2 to 3 days; further, the technological parameters of pouring concrete into the pile hole 1 in the step two are as follows: the distance between the upper surface of the concrete poured in the pile hole 1 and the upper edge of the opening of the underground cavern 2 intersected with the pile hole 1 is larger than 300 mm. Preferably, the strength grade of the concrete in the second step is not lower than C15.
Step three: and repeating the second step, and stopping the rotary drilling rig and taking out the tunneling drill bit when the drilling depth of the tunneling drill bit is consistent with the depth of the pile hole 1 on the construction drawing which is drawn in advance.
In addition, the method for forming the hole by the rotary drilling rig for the large-size pile hole in the karst region further comprises the following steps:
after the third step is completed, preparing a reinforcement cage, wherein the outer diameter of the reinforcement cage is between the diameter of the pile hole 1 on the construction drawing which is drawn in advance and the outer diameter of the tunneling drill bit, placing the reinforcement cage into the pile hole 1, pouring concrete along the inner wall of the pile hole 1 until the hole of the pile hole 1 is flush, after the concrete is solidified for 5 days, even if the solidification strength of the concrete reaches more than 50% of the strength when the concrete is completely solidified, installing a forming drill bit on the rotary drilling rig in the first step, wherein the outer diameter of the forming drill bit is consistent with the diameter of the pile hole 1 on the construction drawing which is drawn in advance, starting the rotary drilling rig, drilling towards the ground through the forming drill bit, stopping the rotary drilling rig and taking out the forming drill bit when the drilling depth of the forming drill bit is consistent with the depth of the pile hole 1 on the construction drawing which is drawn in advance. Preferably, the interval between the formation time of the retaining wall 3 and the time for stopping the rotary drilling rig and taking out the formed drill bit is at least 14 days. Even if the concrete has a setting strength of 75% or more of the strength at the time of complete setting.
Further, the difference between the outer diameter of the reinforcement cage and the diameter of the pile hole 1 on the construction drawing which is drawn in advance is preferably at least 150 mm.
In addition, the method for forming the hole by the rotary drilling rig for the large-size pile hole in the karst region further comprises the following steps:
after the reinforcement cage and the poured concrete are condensed together to form the retaining wall 3, all impurities in the pile hole 1 are manually removed.
Further, the method for forming the hole by the rotary drilling rig for the large-size pile hole in the karst region further comprises the following steps:
after the reinforcement cage and the poured concrete are condensed together to form a retaining wall 3, the wall and the bottom wall of the pile hole 1 are manually dug, so that the shape of the pile hole 1 is consistent with the shape of the pattern of the pile hole 1 on the construction drawing which is drawn in advance. The manual excavation may use tools such as pneumatic drills, wind drafts, and water mill drills to excavate various shapes that have been previously designed.
By adopting the technical scheme of the invention, the underground rock soil is excavated by using the rotary drilling rig provided with the tunneling drill bit, the pile hole forming construction efficiency is greatly improved, the construction period is shortened, the tunneling drill bit is larger than the diameter of the pile hole, so that the once backfilling and reinforcing treatment can be conveniently carried out on all karst caves encountered in the construction, the phenomena of slurry leakage, hole collapse and the like are effectively avoided, meanwhile, the construction period is greatly shortened under the condition that half-rock semi-flow soft plastic red clay is prevented from flowing into incompletely formed hole piles, the pile hole forming efficiency is improved, and finally, the rotary drilling rig and the forming drill bit are matched to construct on the inner wall of the pile hole to form a protective wall, so that the erosion effect of underground water on the pile foundation is effectively blocked, the bearing capacity of the pile foundation structure is ensured, and the durability of the pile foundation is enhanced.
Claims (9)
1. A pore-forming method of a rotary drilling rig for large-size pile holes in karst areas is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: providing a rotary drilling rig, wherein a tunneling drill bit is arranged on the rotary drilling rig, and the outer diameter of the tunneling drill bit is larger than the aperture of a pile hole (1) on a construction drawing which is drawn in advance;
step two: starting the rotary drilling rig, drilling to the ground through the tunneling drill bit in the first step, stopping the rotary drilling rig and taking out the tunneling drill bit when the pile hole (1) is intersected with the underground karst cave (2) in the process that the tunneling drill bit tunnels out of rock and soil to form the pile hole (1), pouring concrete into the pile hole (1), and standing for 2 to 3 days after the concrete is solidified;
step three: and repeating the second step, and stopping the rotary drilling rig and taking out the tunneling drill bit when the drilling depth of the tunneling drill bit is consistent with the depth of the pile hole (1) on the construction drawing which is drawn in advance.
2. The method for forming the hole of the rotary drilling rig for the large-size pile hole in the karst region according to claim 1, wherein the method comprises the following steps: the difference between the outer diameter of the tunneling drill bit and the diameter of the pile hole (1) on the construction drawing which is drawn in advance is at least 300 mm.
3. The method for forming the hole of the rotary drilling rig for the large-size pile hole in the karst region according to claim 1, wherein the method comprises the following steps: in the second step, the technological parameters for pouring concrete into the pile hole (1) are as follows: and enabling the distance between the upper surface of the concrete poured in the pile hole (1) and the upper edge of the opening of the underground karst cave (2) intersected with the pile hole (1) to be larger than 300 mm.
4. The method for forming the hole of the rotary drilling rig for the large-size pile hole in the karst region according to claim 1, wherein the method comprises the following steps: the method for forming the hole by the rotary drilling rig for the large-size pile hole in the karst area further comprises the following steps:
after the third step is finished, preparing a reinforcement cage, wherein the outer diameter of the reinforcement cage is between the aperture of the pile hole (1) on the construction drawing which is drawn in advance and the outer diameter of the tunneling drill bit, placing the reinforcement cage into the pile hole (1), pouring concrete along the inner wall of the pile hole (1) until the aperture of the pile hole (1) is flush, after the concrete is solidified for 5 days, mounting a forming drill bit on the rotary drilling rig in the first step, wherein the outer diameter of the forming drill bit is consistent with the aperture of the pile hole (1) on the construction drawing which is drawn in advance, starting the rotary drilling rig, drilling towards the ground through the forming drill bit, stopping the rotary drilling rig and taking out the forming drill bit when the drilling depth of the forming drill bit is consistent with the depth of the pile hole (1) on the construction drawing which is drawn in advance, and enabling the reinforcement cage and the poured concrete to be condensed together to form.
5. The method for forming the hole of the rotary drilling rig for the large-size pile hole in the karst region according to claim 4, wherein the method comprises the following steps: the difference between the outer diameter of the reinforcement cage and the diameter of the pile hole (1) on the construction drawing which is drawn in advance is at least 150 mm.
6. The method for forming the hole of the rotary drilling rig for the large-size pile hole in the karst region according to claim 4, wherein the method comprises the following steps: the method for forming the hole by the rotary drilling rig for the large-size pile hole in the karst area further comprises the following steps:
and after the reinforcement cage and the poured concrete are condensed together to form a protective wall (3), manually removing all impurities in the pile hole (1).
7. The method for forming the hole of the rotary drilling rig for the large-size pile hole in the karst region according to claim 4, wherein the method comprises the following steps: the method for forming the hole by the rotary drilling rig for the large-size pile hole in the karst area further comprises the following steps:
and after the reinforcement cage and the poured concrete are condensed together to form a retaining wall (3), manually cutting the wall and the bottom wall of the pile hole (1) to enable the shape of the pile hole (1) to be consistent with the pattern shape of the pile hole (1) on a construction drawing which is drawn in advance.
8. The method for forming the hole of the rotary drilling rig for the large-size pile hole in the karst region according to claim 4, wherein the method comprises the following steps: the forming time of the protective wall (3) and the time interval of stopping the rotary drilling rig and taking out the formed drill bit are at least 14 days.
9. The method for forming the hole of the rotary drilling rig for the large-size pile hole in the karst region according to claim 1 or 4, wherein the method comprises the following steps: and in the second step, the strength grade of the concrete is not lower than C15.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010478022.4A CN111561262A (en) | 2020-05-29 | 2020-05-29 | Hole forming method of rotary drilling rig for large-size pile hole in karst area |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010478022.4A CN111561262A (en) | 2020-05-29 | 2020-05-29 | Hole forming method of rotary drilling rig for large-size pile hole in karst area |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113445498A (en) * | 2021-02-05 | 2021-09-28 | 中铁八局集团有限公司 | Construction process of karst hole pile foundation in complex geology |
| CN115679971A (en) * | 2022-10-17 | 2023-02-03 | 山东大学 | Karst area bored pile hole forming and concrete pouring method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113445498A (en) * | 2021-02-05 | 2021-09-28 | 中铁八局集团有限公司 | Construction process of karst hole pile foundation in complex geology |
| CN115679971A (en) * | 2022-10-17 | 2023-02-03 | 山东大学 | Karst area bored pile hole forming and concrete pouring method |
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Application publication date: 20200821 |