CN115419067A - Collapse hole disposal device and method for cast-in-situ bored pile - Google Patents
Collapse hole disposal device and method for cast-in-situ bored pile Download PDFInfo
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- CN115419067A CN115419067A CN202211192016.8A CN202211192016A CN115419067A CN 115419067 A CN115419067 A CN 115419067A CN 202211192016 A CN202211192016 A CN 202211192016A CN 115419067 A CN115419067 A CN 115419067A
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- drill rod
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- 238000011065 in-situ storage Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000005553 drilling Methods 0.000 claims description 34
- 239000002893 slag Substances 0.000 claims description 17
- 230000002441 reversible effect Effects 0.000 claims description 16
- 239000002002 slurry Substances 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 9
- 230000003014 reinforcing effect Effects 0.000 claims description 7
- 230000002787 reinforcement Effects 0.000 abstract description 20
- 238000010276 construction Methods 0.000 abstract description 7
- 239000010410 layer Substances 0.000 description 21
- 238000005096 rolling process Methods 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 239000004576 sand Substances 0.000 description 6
- 230000000670 limiting effect Effects 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 239000013049 sediment Substances 0.000 description 3
- 239000004927 clay Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009527 percussion Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D13/00—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers
- E02D13/08—Removing obstacles
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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
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/42—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits
- E21B10/43—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits characterised by the arrangement of teeth or other cutting elements
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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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a device and a method for treating collapsed holes of a cast-in-situ bored pile, which comprise a first drill rod and a plurality of second drill rods which are sequentially connected from bottom to top, wherein the first drill rod and each second drill rod are hollow pipes with two through ends, the outer side wall of the lower end of the first drill rod is connected with a hob head, and the hob head is connected with a plurality of hob heads; and a plurality of tough brush strips are uniformly distributed on the outer side wall of the first drill rod along the circumferential direction and the height direction. When the hole collapse is processed, the method can ensure the pile forming quality and the reinforcement cage not to be damaged, simultaneously reduces the process of repeatedly installing and lowering the reinforcement cage, and improves the construction efficiency.
Description
Technical Field
The invention belongs to the technical field of collapse disposal construction of cast-in-situ bored piles, and particularly relates to a collapse disposal device and method for cast-in-situ bored piles.
Background
As a common bridge foundation form, the cast-in-situ bored pile has the advantages that along with the increase of the diameter and the length and the depth of the pile, the time for placing a reinforcement cage after forming a pile hole can be prolonged, and the phenomenon of hole collapse can often occur in the waiting time period from the formation of the pile hole to the before-pouring, and particularly when geological soil layers are a sand layer, a clay layer and a gravel layer, the deeper the pile length is, the more the hole collapse is easy to occur.
When the general hole collapse amount is small, the burial depth of the reinforcement cage is not large, the reinforcement cage can be pulled out by adopting hoisting equipment, the pile holes are cleaned after the pile holes are disassembled in a layered mode, and the reinforcement cage is lowered again to fill the pile. When the steel reinforcement cage is buried deeply too deeply and can not be pulled out, the steel reinforcement cage is often punched by a percussion drill by filling stones into the hole, and the broken steel reinforcement cage is fished out by using a magnet, so that the cost is high, the construction period is long, and the construction period of the whole project is delayed due to the fact that the project is tight in construction period and is greatly influenced by the flood season in a river channel, and the collapse of a pile foundation.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a collapsed hole disposal device and method for a cast-in-situ bored pile.
In order to solve the technical problems, the invention is realized by the following technical scheme:
a hole collapse disposal device for a bored pile comprises a first drill rod and a plurality of second drill rods which are sequentially connected from bottom to top, wherein the first drill rod and each second drill rod are hollow pipes with two through ends, the outer side wall of the lower end of the first drill rod is connected with a hob head, and the hob head is connected with a plurality of hob heads; and a plurality of tough brush strips are uniformly distributed on the outer side wall of the first drill rod along the circumferential direction and the height direction.
Further, the length of the tough brush strips on the outer side wall of the first drill rod is gradually increased from bottom to top, and the lengths of the tough brush strips on the same height are the same.
Further, the length of the toughness brush strip on the outer side wall of the first drill rod at the highest position is not more than equal to the distance between the outer wall of the first drill rod and the inner wall of the hole to be treated.
Further, each flexible brush strip is detachably connected to the outer side wall of the first drill rod.
Furthermore, the connecting end of each flexible brush strip is provided with a thread, a nut is arranged on the outer side wall of the first drill rod corresponding to the connecting position of the flexible brush strips, and the thread of the connecting end of each flexible brush strip is connected with the corresponding nut on the outer side wall of the first drill rod.
Furthermore, flange plates are arranged at the upper end of the first drill rod and the lower end of the second drill rod connected with the first drill rod, and the upper end of the first drill rod and the lower end of the second drill rod connected with the first drill rod are connected through the flange plates.
Further, the adjacent two second drill rods are detachably connected.
Furthermore, one end of each second drill rod is provided with an external thread, the other end of each second drill rod is provided with an internal thread, and every two adjacent second drill rods are connected in a matched mode through the external thread and the internal thread.
Furthermore, a reinforcing sleeve is fixedly sleeved on the outer side wall of the lower end of the first drill rod, and the hob head is connected to the reinforcing sleeve.
A collapse hole disposal method for a cast-in-situ bored pile is applied to a collapse hole disposal device and comprises the following steps:
mounting the upper end of the second drill pipe on a reverse circulation drilling machine;
putting the hole collapse disposal device into a collapsed hole of the bored pile to be disposed, and putting the hob head on the first drill rod to a position needing to be cleaned;
and starting the reverse circulation drilling machine, driving the second drill rod and the first drill rod to rotate together, further driving the rolling cutter frame to rotate together, enabling the rolling cutter head on the rolling cutter frame to drill downwards, enabling the tough brush strips on the outer side wall of the first drill rod to stir and suspend drilling slag in the collapsed hole in slurry, starting the reverse circulation drilling machine slag discharge pump, and discharging the slurry from the first drill rod and the second drill rod.
Compared with the prior art, the invention has at least the following beneficial effects:
according to the device for treating the collapsed hole of the cast-in-situ bored pile, the outer side wall of the lower end of a first drill rod is connected with a rolling cutter frame, a plurality of rolling cutter heads are connected onto the rolling cutter frame, broken and drilled objects in the collapsed hole are broken and drilled by the rolling cutter heads in the drilling process, a plurality of toughness brush strips are uniformly distributed and connected onto the outer side wall of the first drill rod along the circumferential direction and the height direction of the outer side wall of the first drill rod, broken drilling slag is stirred by the toughness brush strips, the drilling slag can be suspended in slurry, the toughness brush strips can prevent a steel reinforcement cage in the pile hole from interfering the rotation of the steel reinforcement cage, and the drilling slag can be effectively stirred in the slurry. When the device is used, the upper end of the second drill rod is installed on a reverse circulation drilling machine, a collapse hole disposal device is placed in a collapse hole of a bored pile to be disposed, a hob head on the first drill rod is placed to a position needing to be cleaned, the reverse circulation drilling machine is started, the second drill rod and the first drill rod are driven to rotate together, the hob head is driven to rotate together, a hob head on the hob head drills downwards, meanwhile, the tough brush strips on the outer side wall of the first drill rod stir and suspend drilling slag in the collapse hole in mud, a reverse circulation drilling machine slag discharge pump is started, and the mud is discharged from the first drill rod and the second drill rod. In conclusion, the collapse hole disposal device for the cast-in-situ bored pile is used for the collapse hole during the cast-in-situ bored pile construction and the collapse hole disposal when the reinforcement cage is buried, so that the pile forming quality can be ensured, the reinforcement cage is not damaged, the repeated installation and reinforcement cage lowering process is reduced, and the construction efficiency is improved.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a side view of the overall structure of a collapse hole disposal device for a cast-in-situ bored pile according to the present invention;
FIG. 2 is a front view of a first drill rod and related structures arranged thereon in the cast-in-situ bored pile hole collapse disposal device according to the present invention;
FIG. 3 is a schematic view of a second drill rod in the collapse hole disposal device for the cast-in-situ bored pile according to the present invention;
fig. 4 is a top view of a first drill rod and related structures arranged thereon in the cast-in-situ bored pile hole collapse disposal device.
In the figure: 1-a first drill rod; 2-a second drill pipe; 3-hob head; 4-a hob head; 5-flexible brush strip; 6-a flange plate; 7-external threads; 8-internal thread; 9-reinforcing sleeve; 10-a limit ring.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As a specific embodiment of the present invention, referring to fig. 1 to 4, a device for handling a hole collapse of a cast-in-situ bored pile includes a first drill rod 1 and a plurality of second drill rods 2 sequentially connected from bottom to top, where the first drill rod 1 and each of the second drill rods 2 are hollow tubes with two through ends, a hob head 3 is connected to an outer side wall of a lower end of the first drill rod 1, and the hob head 3 is connected to a plurality of hob heads 4; a plurality of tough brush strips 5 are uniformly distributed and connected on the outer side wall of the first drill rod 1 along the circumferential direction and the height direction.
When in use, the upper end of the second drill rod 2 is arranged on a reverse circulation drilling machine; putting a collapse hole disposal device into a collapse hole of the bored pile to be disposed, and putting the hob head 3 on the first drill rod 1 to a position needing to be cleaned; and starting a reverse circulation drilling machine, driving the second drill rod 2 and the first drill rod 1 to rotate together, further driving the hob head 3 to rotate together, enabling the hob head 4 on the hob head 3 to drill downwards, enabling the tough brush strips 5 on the outer side wall of the first drill rod 1 to stir and suspend the drilling slag in the collapsed hole in the slurry, and starting a deslagging pump of the reverse circulation drilling machine to discharge the slurry from the first drill rod 1 and the second drill rod 2.
In addition to the above embodiments, as a more preferred embodiment, as shown in fig. 1 and 2, the length of the flexible brush strip 5 on the outer side wall of the first drill rod 1 gradually increases from bottom to top, and as shown in fig. 4, the length of the flexible brush strip 5 at the same height is the same. Such design for toughness brush strip 5 is progressive to the stirring of boring the sediment, and stirring effect is better, and then makes the sediment of boring discharge through the drilling rod that mud is more smooth and easy.
Preferably, the length of the toughness brush strip 5 positioned at the highest position on the outer side wall of the first drill rod 1 is not more than the distance between the outer wall of the first drill rod 1 and the inner wall of the collapsed hole to be treated, so that the toughness brush strip 5 can brush and sweep the hole of the bored pile without changing the aperture size.
In this embodiment, each tough brush strip 5 is detachably connected to the outer side wall of the first drill rod 1, so that the tough brush strips 5 can be replaced conveniently. Specifically, as shown in fig. 1, 2 and 4, the connecting end of each flexible brush bar 5 is provided with a thread, a nut is provided on the outer side wall of the first drill rod 1 at a position corresponding to the connecting end of the flexible brush bar 5, and the thread of the connecting end of each flexible brush bar 5 is connected with the nut on the outer side wall of the corresponding first drill rod 1.
In addition to the above embodiments, as a more preferable embodiment, as shown in fig. 1 and fig. 2, the flange 6 is provided at both the upper end of the first drill rod 1 and the lower end of the second drill rod 2 connected thereto, and the upper end of the first drill rod 1 and the lower end of the second drill rod 2 connected thereto are connected by the flange 6, and here, the flange 6 is used for connection, so that the reliability of connection is ensured. Can dismantle the connection between two adjacent second drilling rods 2, specifically speaking, as shown in combination of fig. 1 and fig. 3, the one end of second drilling rod 2 is provided with external screw thread 7, and the other end is provided with internal thread 8, connects through external screw thread 7 and internal thread 8 cooperation between two adjacent second drilling rods 2, and this connected mode is convenient for install and dismantles, can change length according to the hole depth is nimble.
Preferably, a reinforcing sleeve 9 is fixedly sleeved on the outer side wall of the lower end of the first drill rod 1, and the hob head 3 is connected to the reinforcing sleeve 9, so that the reliability of the connection structure at the position during the drilling process is ensured.
Preferably, as shown in fig. 1 and 2, a limiting ring 10 is arranged on the outer side wall of the first drill rod 1 near the upper end, and the limiting ring 10 is used for limiting placement during the lowering process of the first drill rod 1.
Preferably, the hob head 4 is a ball hob.
In this embodiment, the outer side wall of the first drill rod 1 is provided with 7 layers of flexible brush strips 5 along the height direction, and each layer includes 8 flexible brush strips 5. Specifically, the length of the first drill rod 1 is 2650mm, a layer of nuts is arranged every 200mm along the height direction of the first drill rod 1, and 8 nuts in each layer are uniformly distributed around the first drill rod 1. The lengths of the 7 layers of flexible brush strips 5 are 290mm, 392mm, 494mm, 596mm, 698mm, 800mm and 902mm respectively from bottom to top. Each flexible brush strip 5 adopts
The wire rope processing of, 5 one ends of every toughness brush strip set up fixed screw pole, and the other end cutting parallel and level of every toughness brush strip 5 adopts staple bolt locking three at a distance of cutting end 50mm department. The length of each second drill rod 2 is 2000mm, and the pipe diameter material of each second drill rod 2 is the same as the drill rod commonly used by the reverse circulation drilling machine.
After the collapse hole of the bored pile is treated, the geological soil layer mainly comprises a sand layer, a clay layer and a gravel layer, the steel reinforcement cage is installed and lowered, the sand layer and the pebble layer at the periphery of the pile hole collapse to bury the steel reinforcement cage in the hole, and the collapse hole cannot be taken out; putting a collapse hole disposal device into a collapse hole of the bored pile to be disposed, and putting the hob head 3 on the first drill rod 1 to a position needing to be cleaned; the reverse circulation drilling machine is started, the second drill rod 2 and the first drill rod 1 are driven to rotate together, the hob head 3 is driven to rotate together, the hob head 4 on the hob head 3 drills downwards, meanwhile, the tough brush strips 5 on the outer side wall of the first drill rod 1 enable drilling slag in a collapsed hole to be stirred and suspended in slurry, the reverse circulation drilling machine slag discharging pump is started, the drilling slag (sediment mixture) enters a pipeline from a slag inlet at the lower end of the first drill rod 1, and the drilling slag is discharged into a slag discharging pool along the inner walls of the first drill rod 1 and the second drill rod 2.
Along with the drilling of the rolling head 4 on the first drill rod 1, the sand in the 780mm range of the center of the pile is preliminarily stirred by the layer of toughness brush strips 5 at the lowest end on the outer side wall of the first drill rod 1, the sand in the 780mm-980mm range of the center of the pile is stirred by the layer of toughness brush strips 5 at the second layer, the stirring radius of the sand in the pile can be increased by 200mm by each layer of toughness brush strips 5 in sequence until the stirring radius of the layer of toughness brush strips 5 at the highest end is changed into 2000mm, and the stirring range is the diameter of the pile foundation to be treated. Because the reinforcement cage has been buried in waiting to deal with the stake hole, can receive the reinforcement cage influence when the hole is swept to the top layer toughness brush 5, toughness brush 5 can bending deformation when receiving the resistance this moment, and the straight after the reinforcing bar returns, after brushing many times repeatedly, reinforcement cage outside protective layer scope silt also can be stirred and suspended and in the mud. When the hole collapse disposal device for the cast-in-situ bored pile is in a working state, slurry in a pile hole to be disposed forms a new slurry retaining wall, along with the discharge of silt in the pile hole to be disposed, the rolling tool bit 4 on the first drill rod 1 is further screwed, the drilling speed and the drill rod rotation speed are adjusted according to the slag discharge condition until the pile bottom, the discharge of the silt of the pile foundation of the hole collapse is completed, and the hole is cleaned.
And after hole cleaning is finished, removing the reverse circulation drilling machine, detecting the aperture by using a pore-forming detector, and after the hole depth meets the design requirement, re-correcting the steel reinforcement cage by using hoisting equipment, accurately positioning, and then putting down the guide pipe to pour into the pile foundation.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. The device for treating hole collapse of the cast-in-situ bored pile is characterized by comprising a first drill rod (1) and a plurality of second drill rods (2) which are sequentially connected from bottom to top, wherein the first drill rod (1) and each second drill rod (2) are hollow pipes with two through ends, the outer side wall of the lower end of the first drill rod (1) is connected with a hob head (3), and the hob head (3) is connected with a plurality of hob heads (4); a plurality of tough brush strips (5) are uniformly distributed and connected on the outer side wall of the first drill rod (1) along the circumferential direction and the height direction.
2. A bored pile hole collapse disposal device according to claim 1, wherein the length of the flexible brush strip (5) on the outer side wall of the first drill rod (1) is gradually increased from bottom to top, and the lengths of the flexible brush strips (5) at the same height are the same.
3. A bored pile hole collapse disposal device according to claim 2, wherein the length of the flexible brush strip (5) on the outer side wall of the first drill rod (1) at the highest position is not more than equal to the distance between the outer wall of the first drill rod (1) and the inner wall of the hole collapse to be disposed.
4. A cast-in-situ bored pile hole collapse disposal device according to claim 1, wherein each of the flexible brush bars (5) is detachably attached to an outer side wall of the first drill rod (1).
5. A cast-in-situ bored pile hole collapse disposal device according to claim 4, wherein a connecting end of each flexible brush bar (5) is provided with a thread, a nut is arranged on the outer side wall of the first drill rod (1) at a position corresponding to the connection position of the flexible brush bar (5), and the thread of the connecting end of each flexible brush bar (5) is connected with the nut on the outer side wall of the corresponding first drill rod (1).
6. A cast-in-situ bored pile hole collapse disposal device according to claim 1, wherein a flange (6) is provided at each of the upper end of the first drill rod (1) and the lower end of the second drill rod (2) connected thereto, and the upper end of the first drill rod (1) and the lower end of the second drill rod (2) connected thereto are connected by the flange (6).
7. A cast-in-situ bored pile hole collapse disposal device according to claim 1, wherein adjacent two of the second drill rods (2) are detachably connected.
8. The cast-in-situ bored pile hole collapse disposal device according to claim 7, wherein one end of each second drill rod (2) is provided with an external thread (7), the other end of each second drill rod is provided with an internal thread (8), and two adjacent second drill rods (2) are connected in a matched mode through the external thread (7) and the internal thread (8).
9. A cast-in-situ bored pile hole collapse disposal device according to claim 1, wherein a reinforcing sleeve (9) is fixedly sleeved on the outer side wall of the lower end of the first drill rod (1), and the hob head (3) is connected to the reinforcing sleeve (9).
10. A collapse hole disposal method for a cast-in-situ bored pile, characterized in that the collapse hole disposal device according to any one of claims 1 to 9 is applied, and includes:
mounting the upper end of the second drill rod (2) on a reverse circulation drilling machine;
putting the hole collapse disposal device into a collapsed hole of the bored pile to be disposed, and putting the hob head (3) on the first drill rod (1) to a position needing to be cleaned;
the reverse circulation drilling machine is started, the second drill rod (2) and the first drill rod (1) are driven to rotate together, the hob head (3) is driven to rotate together, the hob head (4) on the hob head (3) drills downwards, meanwhile, the tough brush strips (5) on the outer side wall of the first drill rod (1) stir and suspend drilling slag in a collapsed hole in slurry, the reverse circulation drilling machine slag discharge pump is started, and the slurry is discharged from the first drill rod (1) and the second drill rod (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211192016.8A CN115419067A (en) | 2022-09-28 | 2022-09-28 | Collapse hole disposal device and method for cast-in-situ bored pile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211192016.8A CN115419067A (en) | 2022-09-28 | 2022-09-28 | Collapse hole disposal device and method for cast-in-situ bored pile |
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| CN202211192016.8A Pending CN115419067A (en) | 2022-09-28 | 2022-09-28 | Collapse hole disposal device and method for cast-in-situ bored pile |
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