CN112832231A - Construction method of cast-in-situ bored pile in karst cave area - Google Patents
Construction method of cast-in-situ bored pile in karst cave area Download PDFInfo
- Publication number
- CN112832231A CN112832231A CN202110007649.6A CN202110007649A CN112832231A CN 112832231 A CN112832231 A CN 112832231A CN 202110007649 A CN202110007649 A CN 202110007649A CN 112832231 A CN112832231 A CN 112832231A
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- Prior art keywords
- karst cave
- rotary
- soil
- drill bit
- drill
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- 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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
-
- 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
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
-
- 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
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
- E02D5/385—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with removal of the outer mould-pipes
Abstract
The invention discloses a construction method for treating a karst cave, which belongs to the field of building construction, and comprises a rotary drilling bit for treating the karst cave, and the construction method further comprises the following steps: surveying the construction site, and embedding a steel pile casing; carrying a common drill bit to drill and fetch soil to a karst cave position; backfilling soil taken out by the rotary digging machine; the rotary excavator replaces a common drill bit with a rotary drill bit for processing the karst cave, and the rotary drill bit downwards extrudes soil in the pile hole; a drill rod of the rotary drilling machine drives a rotary drilling bit for processing the karst cave to continuously compact soil in the karst cave from top to bottom; backfilling to the top of the karst cave, and compacting the soil body in the karst cave again; after the karst cave is treated, a reinforcement cage is put down and concrete is poured; and after the concrete is poured, pulling out the steel casing by using a pulling machine. The construction method for treating the karst cave disclosed by the invention has the advantages that the hole screwing process is added, the soil of the karst cave is densely filled, and the subsequent drilling and pouring process is ensured.
Description
Technical Field
The invention relates to the field of building construction, in particular to a construction method of a cast-in-situ bored pile in a karst cave area.
Background
Aiming at the construction of the cast-in-situ bored pile in the karst cave area, in the construction aspect of the karst cave area in the prior art, a steel casing is mainly adopted for isolation or backfill soil is adopted for plugging, and in the subsequent drilling process, the backfill soil for filling the karst cave needs a certain time to solidify, so that the drilling cost is increased, and the drilling of the rotary excavation hole is influenced.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to solve the technical problem of providing a construction method of a cast-in-situ bored pile in a karst cave area.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a construction method of a cast-in-situ bored pile in a karst cave area, which comprises a rotary drilling bit for processing the karst cave, and further comprises the following steps:
step 1: surveying the construction site, checking an engineering survey report, and knowing the depth and size of the karst cave;
step 2: measuring and positioning after the field is leveled, and conveying the drilling machine to a specified position after the field is qualified;
and step 3: embedding a steel protective cylinder by a drawing machine;
and 4, step 4: adopting a rotary excavator to carry a common drill bit to drill and take soil to a karst cave position;
and 5: backfilling the soil taken out by the rotary excavating machine by adopting an excavator until the soil is 2m above the top of the karst cave;
step 6: the rotary excavator replaces a common drill bit with a rotary drill bit for processing the karst cave, and the rotary drill bit downwards extrudes soil in the pile hole;
and 7: repeating the step 5 and the step 6 at least once, and then continuously compacting soil in the karst cave from top to bottom by driving a rotary drilling bit for processing the karst cave by a drill rod of the rotary drilling machine;
and 8: taking the drill bit after the drill bit is compacted to the bottom of the karst cave and backfilling the drill bit again to the top of the karst cave, and then driving a rotary drilling bit for processing the karst cave to compact the soil body in the karst cave by the drill rod of the rotary drilling machine again;
and step 9: after the karst cave is processed, the rotary excavator changes the earth-taking drill bit to normally drill until the elevation of the pile top is reached, and a reinforcement cage is lowered and concrete is poured;
step 10: when concrete is poured to a position 2m above the top of the karst cave, the middle part of the karst cave is reserved at the conduit opening for pouring, the depth of the buried pipe is kept to be 6m, and the backfill soil of the karst cave is further compacted through the lateral pressure of the concrete;
step 11: after the concrete is poured, the steel casing is pulled out by a pulling machine, the elevation condition of the orifice concrete is closely poured, and if the steel casing sinks, the steel casing is timely supplemented to ensure the integrity of the pile body concrete.
Preferably, the rotary drilling bit for treating the karst cave comprises a cylinder body, and a drill rod rotates to drive the cylinder body to rotate; the drill point is arranged at the bottom of the barrel, and the axis of the drill point is superposed with the axis of the barrel; the wedge strip, the quantity of wedge strip is four at least, and is a plurality of the wedge strip uses the barrel axis is the axle, circumference set up in the barrel bottom.
Preferably, the wedge strip is fixed to the bottom of the cylinder by welding.
Preferably, the distance between the side surface of the wedge strip away from the cylinder and the side surface of the wedge strip attached to the cylinder is 4-6 cm; the longitudinal length of the wedge strip is 25-35 cm.
Preferably, the top of the cylinder is connected with the drill rod through a locking device.
Preferably, wing plates are arranged between the top surface of the barrel and the top of the locking device, and the number of the wing plates is at least two; the wing plates are arranged in the circumferential direction of the cylinder by taking the axis of the cylinder as an axis.
The invention has the beneficial effects that:
the wedge strip is arranged on the outer side of the rotary drill bit barrel, the wedge strip rotates along with the barrel in the rotating process of the barrel, soil in the drilling process is thrown to the karst cave, the soil filling the karst cave is filled, the backfill soil filling the karst cave needs to be solidified for a certain time, the cost of drilling is increased, the drilling of the rotary excavation hole is influenced, the dense process of filling the soil in the karst cave is increased in the traditional cast-in-situ bored pile construction method, and the smooth construction of the follow-up cast-in-situ bored pile is guaranteed.
Drawings
FIG. 1 is a front view of a rotary drilling bit for treating a karst cave according to an embodiment of the present invention;
FIG. 2 is a top view of a rotary drilling bit for treating a karst cave according to an embodiment of the present invention;
fig. 3 is a construction schematic diagram of a construction method of a cast-in-situ bored pile in a karst cave area according to an embodiment of the present invention.
In the figure:
1. a locking device; 2. a wing plate; 3. a barrel; 4. wedge strips; 5. and (4) drilling a tip.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
As shown in fig. 1 and fig. 2, the construction method for a bored pile in a karst cave area provided in this embodiment includes a rotary drill bit for processing the karst cave, and further includes the following steps:
step 1: the method comprises the steps of surveying a construction site, checking an engineering survey report, knowing the depth and the size of the karst cave, wherein an instrument for detecting the karst cave belongs to the prior art, and can be used for detecting the data of the depth and the size of the karst cave;
step 2: measuring and positioning after the field is leveled, and conveying the drilling machine to a specified position after the field is qualified;
and step 3: embedding a steel protecting cylinder through a pulling machine, wherein the steel protecting cylinder is used for protecting a hole wall and isolating surface layer groundwater, and the steel protecting cylinder is arranged to ensure the operation mode in the subsequent step, so that the isolation of the surface layer groundwater is required;
and 4, step 4: drilling and taking soil to a karst cave position by using a rotary excavating machine and carrying a common drill bit in a dry operation mode;
and 5: backfilling soil (mainly viscous soil) taken out by the rotary excavating machine by using an excavator until the soil is 2m above the top of the karst cave;
step 6: the rotary excavator replaces a common drill bit with a rotary drill bit for processing the karst cave, and the rotary drill bit downwards extrudes soil in the pile hole;
and 7: repeating the step 5 and the step 6 at least once, and then continuously compacting soil in the karst cave from top to bottom by driving a rotary drilling bit for processing the karst cave by a drill rod of the rotary drilling machine;
and 8: taking the drill bit after the drill bit is compacted to the bottom of the karst cave and backfilling the drill bit again to the top of the karst cave, and then driving a rotary drilling bit for processing the karst cave to compact the soil body in the karst cave by the drill rod of the rotary drilling machine again;
and step 9: after the karst cave is processed, the rotary excavator changes the earth-taking drill bit to normally drill until the elevation of the pile top is reached, and a reinforcement cage is lowered and concrete is poured;
step 10: when concrete is poured to a position 2m above the top of the karst cave, the middle part of the karst cave is reserved at the conduit opening for pouring, the depth of the buried pipe is kept to be 6m, and the backfill soil of the karst cave is further compacted through the lateral pressure of the concrete;
step 11: after the concrete is poured, the steel casing is pulled out by a pulling machine, the elevation condition of the orifice concrete is closely poured, and if the steel casing sinks, the steel casing is timely supplemented to ensure the integrity of the pile body concrete.
Further, the rotary drilling bit for processing the karst cave comprises a cylinder 3, and the cylinder 3 is driven to rotate by the rotation of the drill rod; the drill point 5 is arranged at the bottom of the barrel 3, and the axis of the drill point 5 is superposed with the axis of the barrel 3; the wedge strip 4, the quantity of wedge strip 4 is four at least, and a plurality of wedge strips 4 use the barrel 3 axis as the axle, and circumference sets up in the barrel 3 bottom.
Further, the distance between the side surface of the wedge strip 4 far away from the cylinder 3 and the side surface of the wedge strip 4 attached to the cylinder 3 is 4-6cm, which is 5cm in the embodiment; the longitudinal length of the wedge strip 4 is 25-35cm, in this embodiment, 30cm is taken, the too short width of the wedge strip 4 cannot play a role in throwing soil into the karst cave, and the too long width causes the overweight of the bottom of the barrel 3, so that the barrel 3 generates larger deviation in the rotating process.
Further, the top of the cylinder 3 is connected with the drill rod through the locking device 1, and the locking device 1 is fixed with the cylinder 3.
Furthermore, wing plates 2 are arranged between the top surface of the barrel 3 and the top of the locking device 1, and the number of the wing plates 2 is at least two; the plurality of vanes 2 are provided in the circumferential direction of the cylinder 3.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention. The present invention is not to be limited by the specific embodiments disclosed herein, and other embodiments that fall within the scope of the claims of the present application are intended to be within the scope of the present invention.
Claims (5)
1. A construction method of a cast-in-situ bored pile in a karst cave area comprises a rotary drilling bit for processing the karst cave, and is characterized by comprising the following steps:
step 1: surveying the construction site, checking an engineering survey report, and knowing the depth and size of the karst cave;
step 2: measuring and positioning after the field is leveled, and conveying the drilling machine to a specified position after the field is qualified;
and step 3: embedding a steel protective cylinder by a drawing machine;
and 4, step 4: adopting a rotary excavator to carry a common drill bit to drill and take soil to a karst cave position;
and 5: backfilling the soil taken out by the rotary excavating machine by adopting an excavator until the soil is 2m above the top of the karst cave;
step 6: the rotary excavator replaces a common drill bit with a rotary drill bit for processing the karst cave, and the rotary drill bit downwards extrudes soil in the pile hole;
and 7: repeating the step 5 and the step 6 at least once, and then continuously compacting soil in the karst cave from top to bottom by driving a rotary drilling bit for processing the karst cave by a drill rod of the rotary drilling machine;
and 8: taking the drill bit after the drill bit is compacted to the bottom of the karst cave and backfilling the drill bit again to the top of the karst cave, and then driving a rotary drilling bit for processing the karst cave to compact the soil body in the karst cave by the drill rod of the rotary drilling machine again;
and step 9: after the karst cave is processed, the rotary excavator changes the earth-taking drill bit to normally drill until the elevation of the pile top is reached, and a reinforcement cage is lowered and concrete is poured;
step 10: when concrete is poured to a position 2m above the top of the karst cave, the middle part of the karst cave is reserved at the conduit opening for pouring, the depth of the buried pipe is kept to be 6m, and the backfill soil of the karst cave is further compacted through the lateral pressure of the concrete;
step 11: after the concrete is poured, the steel casing is pulled out by a pulling machine, the elevation condition of the orifice concrete is closely poured, and if the steel casing sinks, the steel casing is timely supplemented to ensure the integrity of the pile body concrete.
2. The construction method of the cast-in-situ bored pile in the karst cave area according to claim 1, wherein the rotary drill bit for processing the karst cave comprises:
the drill rod rotates to drive the cylinder (3) to rotate;
the drill point (5) is arranged at the bottom of the barrel (3), and the axis of the drill point (5) is superposed with the axis of the barrel (3);
the wedge strip (4), the quantity of wedge strip (4) is four at least, and is a plurality of wedge strip (4) use barrel (3) axis is the axle, circumference set up in barrel (3) bottom.
3. The construction method of the cast-in-situ bored pile in the karst cave area according to claim 2, wherein:
the distance between the side surface of the wedge strip (4) far away from the cylinder body (3) and the side surface of the wedge strip (4) attached to the cylinder body (3) is 4-6 cm;
the longitudinal length of the wedge strip (4) is 25-35 cm.
4. The construction method of the cast-in-situ bored pile in the karst cave area according to claim 2, wherein:
the top of the cylinder body (3) is connected with the drill rod through the locking device (1).
5. The construction method of the cast-in-situ bored pile in the karst cave area according to claim 2, wherein:
wing plates (2) are arranged between the top surface of the barrel (3) and the top of the locking device (1), and the number of the wing plates (2) is at least two;
the wing plates (2) are arranged in the circumferential direction of the axis of the cylinder (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110007649.6A CN112832231A (en) | 2021-01-05 | 2021-01-05 | Construction method of cast-in-situ bored pile in karst cave area |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110007649.6A CN112832231A (en) | 2021-01-05 | 2021-01-05 | Construction method of cast-in-situ bored pile in karst cave area |
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| CN112832231A true CN112832231A (en) | 2021-05-25 |
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| CN202110007649.6A Pending CN112832231A (en) | 2021-01-05 | 2021-01-05 | Construction method of cast-in-situ bored pile in karst cave area |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115045295A (en) * | 2022-07-12 | 2022-09-13 | 广东工业大学 | Novel equipment for supporting inside of karst cave |
Citations (5)
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| JP2009091808A (en) * | 2007-10-09 | 2009-04-30 | Kurimoto Ltd | Leading end member of rotary penetration pile |
| CN106481278A (en) * | 2015-09-02 | 2017-03-08 | 宜昌朝阳建设工程有限责任公司 | A kind of rotary digging drill bit |
| CN110230309A (en) * | 2019-01-24 | 2019-09-13 | 中建新疆建工土木工程有限公司 | Karst region bridge solution cavity pile base construction method |
| CN111852326A (en) * | 2020-07-06 | 2020-10-30 | 深圳市工勘岩土集团有限公司 | Karst development area rotary excavating mine type extrusion drill bit karst cave treatment method |
| CN111962507A (en) * | 2020-08-20 | 2020-11-20 | 中交一公局集团有限公司 | Pile foundation hole forming method |
-
2021
- 2021-01-05 CN CN202110007649.6A patent/CN112832231A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2009091808A (en) * | 2007-10-09 | 2009-04-30 | Kurimoto Ltd | Leading end member of rotary penetration pile |
| CN106481278A (en) * | 2015-09-02 | 2017-03-08 | 宜昌朝阳建设工程有限责任公司 | A kind of rotary digging drill bit |
| CN110230309A (en) * | 2019-01-24 | 2019-09-13 | 中建新疆建工土木工程有限公司 | Karst region bridge solution cavity pile base construction method |
| CN111852326A (en) * | 2020-07-06 | 2020-10-30 | 深圳市工勘岩土集团有限公司 | Karst development area rotary excavating mine type extrusion drill bit karst cave treatment method |
| CN111962507A (en) * | 2020-08-20 | 2020-11-20 | 中交一公局集团有限公司 | Pile foundation hole forming method |
Non-Patent Citations (1)
| Title |
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| 王东生: "《岩溶高原湖盆区城市快速路施工新技术——哨关路工程施工实践》", 30 April 2018, 西南交通大学出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115045295A (en) * | 2022-07-12 | 2022-09-13 | 广东工业大学 | Novel equipment for supporting inside of karst cave |
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Application publication date: 20210525 |
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