CN111456638A - Cutting drill bit for double-layer foundation rotary-expanding circular truncated cone pile construction and construction method - Google Patents
Cutting drill bit for double-layer foundation rotary-expanding circular truncated cone pile construction and construction method Download PDFInfo
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- CN111456638A CN111456638A CN202010345651.XA CN202010345651A CN111456638A CN 111456638 A CN111456638 A CN 111456638A CN 202010345651 A CN202010345651 A CN 202010345651A CN 111456638 A CN111456638 A CN 111456638A
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- cutting
- drill bit
- truncated cone
- rotary
- circular truncated
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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
- E21B10/00—Drill bits
- E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
- E21B10/32—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
- E21B10/322—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools cutter shifted by fluid pressure
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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
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
- E02D5/44—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with enlarged footing or enlargements at the bottom of the pile
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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
- 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 DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/60—Drill bits characterised by conduits or nozzles for drilling fluids
- E21B10/602—Drill bits characterised by conduits or nozzles for drilling fluids the bit being a rotary drag type bit with blades
Abstract
A cutting drill bit for double-layer foundation rotary-expanding circular truncated cone pile construction and a construction method thereof comprise an outer sleeve, a hydraulic cylinder, a sliding shaft, a cutting blade, a driving rod and a fixing shaft; the left side and the right side of the outer sleeve are provided with first strip holes; the upper parts of the front side surface and the rear side surface of the outer sleeve are provided with second strip holes; the lower parts of the front side surface and the rear side surface of the outer sleeve are provided with connecting holes; the hydraulic cylinder is arranged at the upper end inside the outer sleeve; the bottom of the hydraulic cylinder is connected with a telescopic connecting rod; the sliding shaft is longitudinally connected to the bottom of the telescopic connecting rod; the front end and the rear end of the sliding shaft are respectively inserted into the second strip-shaped holes; two cutting blades are hinged with the sliding shaft; the front end and the rear end of the fixed shaft are inserted into the connecting holes; two driving rods are arranged between the two cutting blades and the fixed shaft; the upper end of the driving rod is hinged with the cutting blade, and the lower end of the driving rod is hinged with the fixed shaft. The invention solves the technical problems of soil squeezing effect, easy hole collapse, diameter reduction and low construction efficiency in the traditional construction method.
Description
Technical Field
The invention belongs to the technical field of foundation engineering construction, and particularly relates to a cutting drill bit for double-layer foundation rotary-expanding circular truncated cone pile construction and a construction method.
Background
Aiming at the characteristics of multilayer foundation soil, a bearing disc is arranged on a pile body or a pile end is expanded to improve the stress performance of an engineering pile in engineering. Compared with the common cast-in-place concrete pile, on the premise of meeting the same design bearing capacity, the bearing disc is additionally arranged or the pile end is enlarged, so that the stressed cross section of the pile body can be increased, the compressive and uplift resistance of the pile body is improved, the settlement of the pile body can be reduced, and the drilling workload and the cast-in-place concrete amount can be greatly reduced. Therefore, the construction method of additionally arranging the bearing disc or expanding the pile end achieves the purposes of improving the working efficiency, reducing the use of raw materials, reducing the cost, saving energy and improving the efficiency, and has high engineering application value. At present, a bearing disc is arranged on a pile body or a pile end is expanded, a common construction method is mechanical extrusion expansion or manual excavation expansion, a certain soil extrusion effect or safety risk exists in the construction of the method, hole collapse and hole shrinkage are easy to cause, the disc forming process needs to be repeatedly lifted and rotated to extrude and expand equipment, the construction efficiency is low, and the construction requirement of the process cannot be well met.
Disclosure of Invention
The invention aims to provide a cutting drill bit for double-layer foundation rotary-expanding circular truncated cone pile construction and a construction method, and aims to solve the technical problems of soil squeezing effect, easiness in hole collapse and hole shrinkage and low construction efficiency of the traditional construction method.
In order to achieve the purpose, the invention adopts the following technical scheme.
A cutting drill bit for double-layer foundation rotary-expanding circular truncated cone pile construction is arranged at the bottom of a drill rod of a rotary drilling rig; the cutting drill comprises an outer sleeve, a hydraulic cylinder, a telescopic connecting rod, a sliding shaft, a cutting blade, a driving rod and a fixed shaft; the left side and the right side of the outer sleeve are respectively provided with a vertical first strip hole, and the cutting blade is outwards expanded and inwards recovered through the first strip holes; the upper parts of the front side surface and the rear side surface of the outer sleeve are correspondingly provided with vertical second long-strip holes, the sliding shaft is positioned in the second long-strip holes, and the sliding shaft slides up and down in the second long-strip holes under the action of the hydraulic cylinder; the hydraulic cylinder is positioned at the upper end of the inner side of the outer sleeve, and the lower part of the hydraulic cylinder is fixedly connected with the telescopic connecting rod; the central shaft of the sliding shaft is hinged with the bottom of the telescopic connecting rod and moves up and down under the driving of the hydraulic cylinder and the telescopic connecting rod; the two driving rods are respectively arranged between the two cutting blade sheets and the fixed shaft; the lower parts of the front side surface and the rear side surface of the outer sleeve are correspondingly provided with connecting holes, the fixed shaft is positioned in the connecting holes and is hinged with the driving rod connected with the cutting blade; the upper end of the cutting blade is hinged with the sliding shaft, and the lower end of the cutting blade is connected with the driving rod, so that the two driving rods and the two cutting blades form a parallelogram; the hydraulic cylinder drives the telescopic connecting rod to extend, and the sliding shaft moves downwards to drive the two cutting blades to respectively extend out of the outer sides of the second strip holes; the hydraulic cylinder drives the telescopic connecting rod to contract, and the sliding shaft moves upwards to drive the two cutting blades to contract into the outer sleeve.
Preferably, the top of the outer sleeve is provided with an inserting end, and the inserting end is connected with the drill rod in a socket joint mode.
Preferably, the length of the first elongated hole is 1.6-1.7 m.
Preferably, the length of the second elongated hole is 0.6-0.7 m.
Preferably, the length of the cutting blade is 1.6-1.7 m, and the width of the cutting blade is 0.5-0.55 m.
Preferably, the bottom of the outer sleeve is provided with a sealing plate and a slurry outlet; a pointed end is arranged in the middle of the bottom surface of the sealing plate.
A construction method of a cutting drill bit for double-layer foundation rotary-expanding circular truncated cone pile construction comprises the following steps.
The method comprises the steps of firstly, carrying out site pile position positioning according to the pile foundation engineering condition, determining stratum information of a pile hole position by combining site geological exploration conditions, drilling the pile hole by using a rotary drilling rig, and stopping drilling after drilling to a designed bearing stratum.
And step two, after the straight hole section of the pile hole is formed, replacing a drill bit of the rotary drilling rig with a cutting drill bit, connecting the cutting drill bit with a drill rod and a hydraulic system of the rotary drilling rig, and after the rotary drilling rig and the cutting drill bit are checked and debugged to normally work, centering and lowering the cutting drill bit until the cutting drill bit is lowered to the interface position of the sandy soil and the cohesive soil of the pile end foundation.
Starting a hydraulic system of the rotary drilling rig to enable a hydraulic cylinder to do telescopic motion, pushing a hydraulic driving rod to drive a cutting blade to stretch outwards, and cutting the cohesive soil on the upper layer of the hole wall; meanwhile, the drill rod drives the cutting drill to rotate around the central line, and along with the increase of the rotary expansion radius, the angle between the cutting blade and the vertical shaft of the outer sleeve is increased, so that the bottom of the pile hole is spirally expanded into a circular truncated cone disc cavity.
And fourthly, after the circular truncated cone disc cavity is formed by rotary expansion, the driving rod drives the cutting blade 5 to retract and restore into the outer sleeve, and the cutting blade is lifted out of the pile hole through the drill rod.
And step five, replacing the cutting drill bit with a drilling and excavating drill bit, cleaning the hole for the first time, and performing the next construction after the detection is qualified.
Step six, putting the pile body reinforcement cage into the hole according to the design requirement, putting a pouring concrete guide pipe, replacing and cleaning slurry by using the concrete guide pipe to carry out secondary hole cleaning, and pouring underwater concrete after the thickness of sediments after hole cleaning meets the design requirement so that the circular truncated cone disc cavity is filled with the rib material; and finishing the construction.
Preferably, in the second step, the centering state of the drill rod and the cutting bit is ensured in the process of centering and descending the equipment.
Preferably, when the cutting blade of the cutting drill bit is extruded or recovered in the process of the rotary expansion into the circular truncated cone disc cavity in the third step, the hydraulic numerical value, the descending height of the orifice mud and the starting and stopping time are observed, comparison and judgment are carried out in time, the rotary drilling rig is turned off in time when abnormality occurs until the situation is found out, and the rotary drilling rig is turned on after correct treatment; and recording the disc forming time and the pressure of a hydraulic system of the rotary drilling rig in detail in the process of forming the circular truncated cone disc cavity by rotary expansion.
Preferably, in the fourth step, after the drill bit is lifted away from the pile hole, the slurry is supplemented in time, and the water head pressure is kept.
Compared with the prior art, the invention has the following characteristics and beneficial effects.
1. Compared with the common straight-section cast-in-place pile, the pile hole constructed by the method has the advantages that the vertical bearing capacity of the rotary-expansion circular truncated cone pile is 2-5 times that of the corresponding straight-hole pile, the settlement of a pile body can be reduced under the condition that the requirement of the bearing capacity is met, the pile length can be shortened, the pile diameter can be reduced, or the number of piles can be reduced, so that the effects of saving investment and shortening the construction period can be achieved.
2. When the rotary-expanding circular truncated cone pile is constructed, the rotary-expanding circular truncated cone pile is only required to be arranged at the bottom of a drill rod and connected with a hydraulic system, and a circular truncated cone disc cavity is cut at the bottom of a pile hole in a rotary mode, so that the process is simple; meanwhile, the cutting drill bit has the characteristics of high mechanical strength, strong cutting and expanding capacity, safe work, reliable forming, flexible operation, convenient maintenance and the like.
3. The rotary drilling rig, the drill rod, the pile body material and the like used in the construction are easy to obtain, only the cutting drill bit is a special device, the construction process is mature and easy to operate, the construction process can adapt to the field condition to the maximum extent, and the construction quality is ensured; under the condition of equivalent bearing capacity, compared with the common slurry retaining wall straight hole pile, the discharge amount of slurry for forming the hole of the rotary-expanding circular truncated cone pile is remarkably reduced, and the environment is protected.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic view of the construction of the cutting bit of the present invention.
FIG. 2 is a schematic structural view of a circular truncated cone cavity at the bottom of a pile hole in the invention.
Fig. 3 is a schematic view of the structure of the present invention installed at the bottom of a drill rod.
Fig. 4 is a partial vertical cross-sectional view of the outer sleeve of the present invention.
FIG. 5 is a flow chart of the construction method of the present invention.
Reference numerals: 1-rotary drilling rig, 1.1-drill rod, 2-outer sleeve, 3-hydraulic cylinder, 4-sliding shaft, 5-cutting blade, 6-driving rod, 7-fixed shaft, 8-first strip hole, 9-second strip hole, 10-connecting hole, 11-inserting end, 12-sealing plate, 13-pointed end, 14-pile hole, 14.1-circular truncated cone disc cavity, 15-cohesive soil, 16-sandy soil, 17-telescopic connecting rod and 18-grout outlet.
Detailed Description
As shown in fig. 1-4, a cutting drill bit for double-layer foundation rotary-expanding circular truncated cone pile construction is installed at the bottom of a drill rod 1.1 of a rotary drilling rig 1; the cutting drill comprises an outer sleeve 2, a hydraulic cylinder 3, a telescopic connecting rod 17, a sliding shaft 4, a cutting blade 5, a driving rod 6 and a fixed shaft 7; the left side and the right side of the outer sleeve 2 are respectively provided with a vertical first strip hole 8, and the cutting blade 5 is outwards opened and inwards recovered through the first strip holes 8; vertical second long holes 9 are correspondingly formed in the upper portions of the front side face and the rear side face of the outer sleeve 2, the sliding shaft 4 is located in the second long holes 9, and the sliding shaft 4 slides up and down in the second long holes 9 under the action of the hydraulic cylinder 3; the hydraulic cylinder 3 is positioned at the upper end of the inner side of the outer sleeve 2, and the lower part of the hydraulic cylinder 3 is fixedly connected with a telescopic connecting rod 17; the central shaft of the sliding shaft 4 is hinged with the bottom of the telescopic connecting rod 17 and moves up and down under the driving of the hydraulic cylinder 3 and the telescopic connecting rod 17; two driving rods 6 are arranged between the two cutting blades 5 and the fixed shaft 7 respectively; connecting holes 10 are correspondingly formed in the lower portions of the front side face and the rear side face of the outer sleeve 2, the fixing shaft 7 is located in the connecting holes 10, and the fixing shaft 7 is hinged to the driving rod 6 connected with the cutting blade 5; the number of the cutting blades 5 is two, the upper ends of the cutting blades 5 are hinged with the sliding shaft 4, and the lower ends of the cutting blades 5 are connected with the driving rods 6, so that the two driving rods 6 and the two cutting blades 5 form a parallelogram; the hydraulic cylinder 3 drives the telescopic connecting rod 17 to extend, and the sliding shaft 4 moves downwards to drive the two cutting blades 5 to respectively extend out of the outer sides of the second strip holes 9; the hydraulic cylinder 3 drives the telescopic connecting rod 17 to contract, and the sliding shaft 4 moves upwards to drive the two cutting blades 5 to contract into the outer sleeve 2.
In this embodiment, the top of the outer sleeve 2 is provided with an insertion end 11, and the insertion end 11 is in socket connection with the drill rod 1.1.
In this embodiment, the length of the first elongated hole 8 is 1.6 to 1.7 m.
In this embodiment, the length of the second elongated hole 9 is 0.6 to 0.7 m.
In the embodiment, the length of the cutting blade 5 is 1.6-1.7 m, and the width of the cutting blade 5 is 0.5-0.55 m.
In this embodiment, the bottom of the outer sleeve 2 is provided with a sealing plate 12 and a grout outlet 18; a tip 13 is provided in the middle of the bottom surface of the closing plate 12.
In the embodiment, the cutting blade 5 is cut into a circular truncated cone disk cavity 14.1 at the bottom of the pile hole 14; the double-layer foundation soil is in the range of a circular truncated cone disc cavity 14.1 at the end part of the pile hole 14, the upper layer soil in the range of the circular truncated cone disc cavity 14.1 is cohesive soil 15, and the upper layer soil in the range of the bearing layer is sandy soil 16.
As shown in FIG. 5, the construction method of the cutting drill for the double-layer foundation rotary-expanding circular truncated cone pile comprises the following steps.
Firstly, positioning a site pile position according to the condition of pile foundation engineering, determining stratum information of the position of a pile hole 14 by combining the condition of site geological exploration, drilling the pile hole 14 by using a rotary drilling rig 1 in a mud retaining wall mode, and stopping drilling after drilling to a designed bearing stratum; the position and thickness variation of each layer of foundation soil are carefully identified and recorded during drilling.
And step two, after the hole forming of the straight hole section of the pile hole 14 is finished, replacing the drill bit of the rotary drilling rig 1 with the cutting drill bit in the embodiment, connecting the drill bit with the drill rod 1.1 and a hydraulic system, and after the rotary drilling rig 1 and the cutting drill bit are checked and debugged to normally work, centering and lowering the cutting drill bit, wherein the centering state of the drill rod 1.1 and the cutting drill bit is ensured in the centering and lowering process of the equipment until the cutting drill bit is lowered to the interface position of the pile end foundation sandy soil 16.
Thirdly, starting a hydraulic system of the rotary drilling rig 1 to enable the hydraulic cylinder 3 to do telescopic motion, pushing the hydraulic driving rod 6 to drive the cutting blade 5 to stretch outwards, and cutting the cohesive soil 15 on the upper layer of the hole wall; meanwhile, the drill rod 1.1 drives the cutting drill to rotate around the central line, and along with the increase of the rotary expansion radius, the angle between the cutting blade 5 and the vertical shaft of the outer sleeve 2 is increased, so that the bottom of the pile hole 14 is spirally expanded into a circular truncated cone disc cavity 14.1.
And fourthly, after the circular truncated cone disc cavity 14.1 is formed by rotary expansion, the driving rod 6 drives the cutting blade 5 to retract and restore to the original position in the outer sleeve 2, and the cutting blade is lifted away from the pile hole 14 through the drill rod 1.1.
And step five, replacing the cutting drill bit with a drilling and excavating drill bit, cleaning the hole for the first time, and performing the next construction after the detection is qualified.
And sixthly, putting the pile body reinforcement cage into the hole according to the design requirement, putting a pouring concrete guide pipe, replacing and cleaning the grout by using the concrete guide pipe to perform secondary hole cleaning, pouring underwater concrete after the thickness of sediments after hole cleaning meets the design requirement, filling the circular truncated cone disc cavity 14.1 with a reinforcement material, and bearing the vertical bearing capacity together with the soil body around the pile body.
In the embodiment, when the circular truncated cone disc cavity 14.1 is formed by rotary expansion in the third step, the hydraulic numerical value, the descending height of the orifice mud and the starting and stopping time are observed in the extrusion or recovery process of the cutting blade 5 of the cutting drill bit, comparison and judgment are carried out in time, the rotary drilling rig 1 is closed in time when abnormality occurs until the situation is found out, and the rotary drilling rig 1 is started after correct treatment; during the process of rotationally expanding the circular truncated cone disk cavity 14.1, the disk forming time, the pressure of a hydraulic system of the rotary drilling rig 1 and the occurrence and treatment measures of some special conditions need to be recorded in detail.
In this embodiment, in the fourth step, after the drill bit is lifted away from the pile hole 14, the slurry is supplemented in time to maintain the water head pressure.
The above embodiments are not intended to be exhaustive or to limit the invention to other embodiments, and the above embodiments are intended to illustrate the invention and not to limit the scope of the invention, and all applications that can be modified from the invention are within the scope of the invention.
Claims (10)
1. A cutting drill bit for double-layer foundation rotary-expanding circular truncated cone pile construction is arranged at the bottom of a drill rod (1.1) of a rotary drilling rig (1); the method is characterized in that: the cutting drill comprises an outer sleeve (2), a hydraulic cylinder (3), a telescopic connecting rod (17), a sliding shaft (4), a cutting blade (5), a driving rod (6) and a fixed shaft (7); the left side and the right side of the outer sleeve (2) are respectively provided with a vertical first strip hole (8), and the cutting blade (5) is outwards opened and inwards recycled through the first strip holes (8); vertical second long holes (9) are correspondingly formed in the upper portions of the front side face and the rear side face of the outer sleeve (2), the sliding shaft (4) is located in the second long holes (9), and the sliding shaft (4) slides up and down in the second long holes (9) under the action of the hydraulic cylinder (3); the hydraulic cylinder (3) is positioned at the upper end of the inner side of the outer sleeve (2), and the lower part of the hydraulic cylinder (3) is fixedly connected with the telescopic connecting rod (17); the central shaft of the sliding shaft (4) is hinged with the bottom of the telescopic connecting rod (17) and moves up and down under the driving of the hydraulic cylinder (3) and the telescopic connecting rod (17); the two driving rods (6) are respectively arranged between the two cutting blade pieces (5) and the fixed shaft (7); connecting holes (10) are correspondingly formed in the lower parts of the front side surface and the rear side surface of the outer sleeve (2), the fixed shaft (7) is positioned in the connecting holes (10), and the fixed shaft (7) is hinged with a driving rod (6) connected with the cutting blade (5); the number of the cutting blade pieces (5) is two, the upper ends of the cutting blade pieces (5) are hinged with the sliding shaft (4), and the lower ends of the cutting blade pieces (5) are connected with the driving rods (6), so that the two driving rods (6) and the two cutting blade pieces (5) form a parallelogram; the hydraulic cylinder (3) drives the telescopic connecting rod (17) to extend, and the sliding shaft (4) moves downwards to drive the two cutting blades (5) to respectively extend out of the outer sides of the second strip-shaped holes (9); the hydraulic cylinder (3) drives the telescopic connecting rod (17) to contract, and the sliding shaft (4) moves upwards to drive the two cutting blades (5) to contract into the outer sleeve (2).
2. The cutting drill bit for double-layer foundation rotary-expanding circular truncated cone pile construction according to claim 1, characterized in that: the top of the outer sleeve (2) is provided with an inserting end (11), and the inserting end (11) is connected with the drill rod (1.1) in a socket joint mode.
3. The cutting drill bit for double-layer foundation rotary-expanding circular truncated cone pile construction according to claim 1, characterized in that: the length of the first long-strip hole (8) is 1.6-1.7 m.
4. The cutting drill bit for double-layer foundation rotary-expanding circular truncated cone pile construction according to claim 1, characterized in that: the length of the second long-strip hole (9) is 0.6-0.7 m.
5. The cutting drill bit for double-layer foundation rotary-expanding circular truncated cone pile construction according to claim 1, characterized in that: the length of the cutting blade (5) is 1.6-1.7 m, and the width of the cutting blade (5) is 0.5-0.55 m.
6. The cutting drill bit for double-layer foundation rotary-expanding circular truncated cone pile construction according to claim 1, characterized in that: the bottom of the outer sleeve (2) is provided with a sealing plate (12) and a slurry outlet (18); a sharp head (13) is arranged in the middle of the bottom surface of the sealing plate (12).
7. The construction method of the cutting drill bit for the double-layer foundation rotary-expanding circular truncated cone pile construction according to any one of claims 1 to 6, is characterized by comprising the following steps:
firstly, positioning a site pile position according to the pile foundation engineering condition, determining stratum information of a pile hole (14) position by combining the site geological exploration condition, drilling the pile hole (14) by using a rotary drilling rig (1), and stopping drilling after drilling to a designed bearing stratum;
step two, after the hole forming of the straight hole section of the pile hole (14) is finished, replacing a drill bit of the rotary drilling rig (1) with a cutting drill bit, connecting the cutting drill bit with a drill rod (1.1) and a hydraulic system of the rotary drilling rig (1), and after checking and debugging that the rotary drilling rig (1) and the cutting drill bit normally work, centrally lowering the cutting drill bit until the cutting drill bit is lowered to the interface position of the pile end foundation sandy soil (16) and the cohesive soil (15);
thirdly, starting a hydraulic system of the rotary drilling rig (1), enabling the hydraulic cylinder (3) to do telescopic motion, pushing a hydraulic driving rod (6) to drive the cutting blade (5) to stretch outwards, and cutting the cohesive soil (15) on the upper layer of the hole wall; meanwhile, the drill rod (1.1) drives the cutting drill to rotate around the central line, and along with the increase of the rotary expansion radius, the angle between the cutting blade (5) and the vertical shaft of the outer sleeve (2) is increased, so that the bottom of the pile hole (14) is spirally expanded into a circular truncated cone disc cavity (14.1);
fourthly, after the circular truncated cone disc cavity (14.1) is formed through rotary expansion, the driving rod (6) drives the cutting blade (5) to retract, and the cutting blade is recovered into the outer sleeve (2) and lifted out of the pile hole (14) through the drill rod (1.1);
replacing the cutting drill bit with a drilling and excavating drill bit, cleaning the hole for the first time, and performing the next construction after the detection is qualified;
step six, putting the pile body reinforcement cage into the hole according to the design requirement, putting a pouring concrete guide pipe, performing replacement and grout cleaning by using the concrete guide pipe to perform secondary hole cleaning, and pouring underwater concrete after the thickness of sediments after hole cleaning meets the design requirement so that the circular truncated cone disc cavity (14.1) is filled with a reinforcement material; and finishing the construction.
8. The construction method of the cutting drill bit for the double-layer foundation rotary-expanding circular truncated cone pile construction according to claim 7, wherein the construction method comprises the following steps: and in the second step, the centering state of the drill rod (1.1) and the cutting bit is ensured in the centering and lowering process of the equipment.
9. The construction method of the cutting drill bit for the double-layer foundation rotary-expanding circular truncated cone pile construction according to claim 7, wherein the construction method comprises the following steps: when the circular truncated cone disc cavity (14.1) is formed by rotary expansion in the third step, the hydraulic numerical value, the descending height and the starting and stopping time of the orifice mud are observed in the extrusion or recovery process of the cutting blade (5) of the cutting drill bit, the comparison and judgment are carried out in time, the rotary drilling rig (1) is closed in time when abnormality occurs until the situation is found out, and the rotary drilling rig (1) is started after correct treatment; and recording the disc forming time and the pressure of a hydraulic system of the rotary drilling rig (1) in detail in the process of rotationally expanding the circular truncated cone disc cavity (14.1).
10. The construction method of the cutting drill bit for the double-layer foundation rotary-expanding circular truncated cone pile construction according to claim 7, wherein the construction method comprises the following steps: in the fourth step, after the drill bit is lifted away from the pile hole (14), the slurry is supplemented in time, and the water head pressure is kept.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010345651.XA CN111456638A (en) | 2020-04-27 | 2020-04-27 | Cutting drill bit for double-layer foundation rotary-expanding circular truncated cone pile construction and construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010345651.XA CN111456638A (en) | 2020-04-27 | 2020-04-27 | Cutting drill bit for double-layer foundation rotary-expanding circular truncated cone pile construction and construction method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111456638A true CN111456638A (en) | 2020-07-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010345651.XA Pending CN111456638A (en) | 2020-04-27 | 2020-04-27 | Cutting drill bit for double-layer foundation rotary-expanding circular truncated cone pile construction and construction method |
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| CN (1) | CN111456638A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115596360A (en) * | 2022-12-14 | 2023-01-13 | 陕西晖煌建筑劳务有限公司（Cn） | Bridge underwater pile foundation drilling device |
| WO2023197398A1 (en) * | 2022-04-11 | 2023-10-19 | 中铁四局集团第五工程有限公司 | Multifunctional device for branch pile construction and construction method for branch pile |
-
2020
- 2020-04-27 CN CN202010345651.XA patent/CN111456638A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023197398A1 (en) * | 2022-04-11 | 2023-10-19 | 中铁四局集团第五工程有限公司 | Multifunctional device for branch pile construction and construction method for branch pile |
| CN115596360A (en) * | 2022-12-14 | 2023-01-13 | 陕西晖煌建筑劳务有限公司（Cn） | Bridge underwater pile foundation drilling device |
| CN115596360B (en) * | 2022-12-14 | 2023-02-28 | 陕西晖煌建筑劳务有限公司 | Bridge underwater pile foundation drilling device |
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