CN114856434B - Construction method for entering inclined rock of ultra-large diameter rotary-excavated bored pile - Google Patents
Construction method for entering inclined rock of ultra-large diameter rotary-excavated bored pile Download PDFInfo
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- CN114856434B CN114856434B CN202210525938.XA CN202210525938A CN114856434B CN 114856434 B CN114856434 B CN 114856434B CN 202210525938 A CN202210525938 A CN 202210525938A CN 114856434 B CN114856434 B CN 114856434B
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- 239000011435 rock Substances 0.000 title claims abstract description 60
- 238000010276 construction Methods 0.000 title claims abstract description 48
- 238000005553 drilling Methods 0.000 claims abstract description 211
- 239000002689 soil Substances 0.000 claims abstract description 65
- 230000005484 gravity Effects 0.000 claims abstract description 10
- 230000002787 reinforcement Effects 0.000 claims abstract description 5
- 238000007789 sealing Methods 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000009991 scouring Methods 0.000 abstract description 5
- 238000003466 welding Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000006378 damage Effects 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 239000004579 marble Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
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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
-
- 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
- E21B12/00—Accessories for drilling tools
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/138—Plastering the borehole wall; Injecting into the formation
-
- 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/28—Enlarging drilled holes, e.g. by counterboring
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/23—Dune restoration or creation; Cliff stabilisation
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- Mining & Mineral Resources (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Geochemistry & Mineralogy (AREA)
- Structural Engineering (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a construction method for entering inclined rock of a super-large-diameter rotary drilling bored pile, which comprises the following steps: 1. drilling a soil layer; 2. drilling a first extended borehole; 3. drilling a second extension borehole; 4. drilling a third extension borehole; 5. and (5) placing a reinforcement cage in the ultra-large diameter rotary drilling hole for construction of the cast-in-place pile. According to the invention, the inclined rock surface is reamed and drilled from inside to outside by utilizing the guide barrel drill with the small size from small to large, the problem that the perpendicularity of drilling is difficult to control due to the fact that the drilling hole is formed by directly drilling and drilling the ultra-large diameter rotary drilling hole is avoided, each guide barrel drill ensures that the center of gravity of the barrel drill body is arranged at the top of the barrel drill body under the condition that the barrel drill body is arranged, the height of the barrel drill is increased, the guidance property of the barrel drill is improved, the guide closing barrel is arranged at the upper part of the guide barrel, the scouring disturbance to the hole wall can be effectively avoided after the height of the barrel body is increased, and the perpendicularity of the barrel drill is easy to control.
Description
Technical Field
The invention belongs to the technical field of construction of super-large diameter rotary drilling bored concrete piles into inclined rocks, and particularly relates to a construction method of super-large diameter rotary drilling bored concrete piles into inclined rocks.
Background
The construction of the pile in the core area of the super high-rise tower mostly adopts the super large-diameter embedded rock pile with the diameter exceeding phi 2.5m, because the pile position in the core area of the super high-rise tower is already determined and can not be changed, the position of each pile is unique, the primary qualification of the pile is ensured, the soil layer in a karst area is relatively stable, the minimum compressive strength of a breeze marble layer is 45.62MPa, the maximum compressive strength is 94.26MPa, the average compressive strength is 66.91MPa, the rock hardness is high, the inclined rock surface height difference is large, the traditional engineering pile adopts the rotary drilling slurry retaining wall pore-forming construction technology, when the rotary drilling rock is carried out on the inclined rock surface, the drill bit can deviate towards the direction with low strength due to the fact that the strength of the rock strength is large, the perpendicularity of the pore is not up to standard, the steel bar cage can not be placed, the inclined rock surface drilling is backfilled for secondary pore-forming, and the construction period influence and the economic loss are large. The traditional rock-entering barrel drill can not completely meet the requirement of hole forming verticality when drilling construction is carried out on breeze marble with rock strength lower than 40MPa and inclined rock surface height difference lower than 3.5m, and the traditional rock-entering construction mode can not meet the requirements of primary qualification and construction period of the construction quality requirement of large-diameter embedded rock piles for areas with the average inclined rock surface height difference higher than 6m and the average compressive strength of the breeze marble of 66.91 MPa.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a construction method for entering inclined rock by using a guide barrel drill with small size to large size to drill holes on the inclined rock surface from inside to outside, so that the problem that the verticality of the drilling holes is difficult to control due to direct drilling of the oversized diameter rotary drilling holes is avoided, each guide barrel drill ensures that the center of gravity of the barrel drill body is provided with a guide barrel at the top of the barrel drill body under the condition that the barrel drill body is internally provided with the guide barrel, the height of the barrel drill is increased, the guidance property of the barrel drill is improved, and a guide closing barrel is arranged at the upper part of the guide barrel, so that the scouring disturbance to the hole wall can be effectively avoided after the height of the barrel body is increased, the verticality of the barrel drill is easy to control, and the popularization and the use are convenient.
In order to solve the technical problems, the invention adopts the following technical scheme: the construction method for entering inclined rock of ultra-large diameter rotary drilling bored concrete pile is characterized by comprising the following steps:
step one, drilling holes in soil layers: vertically drilling in a soil layer by using a rotary drilling rig which meets the requirement of the drilling design size, obtaining a soil layer drilling hole with an oversized diameter, wherein the diameter of the soil layer drilling hole is larger than 2.5 meters, and the hole bottom plane of the soil layer drilling hole is contacted with the inclined rock surface of the rock stratum;
Step two, drilling a first extension drilling hole: a small guide barrel drill is arranged at the bottom of a drill rod of a rotary drilling rig, drilling is started from the center of the bottom of a hole of a soil layer drill hole by using the small guide barrel drill, the soil layer at the bottom of the soil layer drill hole enters an inclined rock surface until drilling is in place, and a first extension drill hole is obtained, wherein the diameter of the first extension drill hole is 0.5D, and D is the diameter of the soil layer drill hole;
The first extension drilling holes and the soil layer drilling holes are coaxially arranged up and down;
step three, drilling a second extension drilling hole: after the first extension drilling hole is drilled in place, lifting the drill by the rotary drilling machine, removing the small guide barrel drill, installing a medium guide barrel drill at the bottom of a drill rod of the rotary drilling machine, starting drilling from the center of the bottom of a hole of the soil layer drilling hole by using the medium guide barrel drill, entering an inclined rock surface through the soil layer at the bottom of the soil layer drilling hole until the drilling is in place, and obtaining a second extension drilling hole, wherein the diameter of the second extension drilling hole is 0.6-0.85D, and the second extension drilling hole is an equal-height widened reaming hole of the first extension drilling hole;
The second extension drilling holes and the soil layer drilling holes are coaxially arranged up and down;
Drilling a third extension drilling hole: after the second extension drilling hole is drilled in place, the rotary drilling machine lifts the drill, the middle-sized guide barrel drill is removed, the large-sized guide barrel drill is installed at the bottom of a drill rod of the rotary drilling machine, the large-sized guide barrel drill is used for drilling from the center of the bottom of a hole of the soil layer drilling hole, the soil layer at the bottom of the soil layer drilling hole enters an inclined rock surface until the drilling hole is drilled in place, a third extension drilling hole is obtained, the diameter of the third extension drilling hole is equal to the diameter of the soil layer drilling hole, and the third extension drilling hole is an equal-height widening reaming hole of the second extension drilling hole;
The third extension drilling holes and the soil layer drilling holes are coaxially and vertically arranged in a penetrating mode, and the third extension drilling holes and the soil layer drilling holes are formed into oversized-diameter rotary drilling holes after being communicated;
The small-sized guide barrel drill, the medium-sized guide barrel drill and the large-sized guide barrel drill have the same structure, the size of the large-sized guide barrel drill is larger than that of the medium-sized guide barrel drill, and the size of the medium-sized guide barrel drill is larger than that of the small-sized guide barrel drill;
the small-sized guide barrel drill, the medium-sized guide barrel drill and the large-sized guide barrel drill comprise barrel drill bodies, drill bits arranged at the bottoms of the barrel drill bodies and guide barrels welded at the tops of the barrel drill bodies, the guide barrels and the barrel drill bodies are coaxially arranged, the guide barrels are consistent with the inner diameter and the outer diameter of the barrel drill bodies, guide closing-in barrels are integrally welded at the tops of the guide barrels, the upper opening size of the guide closing-in barrels is smaller than the lower opening size of the guide closing-in barrels, a plurality of back rib supporting plates are uniformly arranged on the inner walls of the guide barrels in the circumferential direction, a plurality of pulp overflow holes are uniformly arranged at the bottoms of the guide barrels in the circumferential direction, and the edge positions of the bottoms of barrel drill clamping grooves in the central positions of the tops of the barrel drill bodies are connected with the guide barrels and the barrel drill bodies through a plurality of concave-convex connecting pieces;
The ratio of the height of the guide barrel to the height of the barrel drill body is 1:3;
When the small-sized guide barrel drill, the medium-sized guide barrel drill and the large-sized guide barrel drill are used, a drill rod of the rotary drilling rig is connected with a barrel drill clamping groove, and when the barrel drill body drills by using a drill bit, the barrel drill body and the guide barrel are abutted against the wall of a drilling hole, so that the gravity center of the barrel drill body is ensured to be increased in the barrel drill body, the guidance property of the barrel drill is improved, and the verticality of the ultra-large diameter rotary drilling hole is ensured;
Fifthly, placing a reinforcement cage in the ultra-large diameter rotary drilling hole for construction of the cast-in-place pile.
The construction method for entering inclined rock of ultra-large diameter rotary drilling bored concrete pile is characterized by comprising the following steps of: the back edge support plate is a right-angle triangular back edge support plate, one right-angle side of the right-angle triangular back edge support plate is abutted to the top surface of the barrel drill body, and the other right-angle side of the right-angle triangular back edge support plate is welded to the inner wall of the guide barrel.
The construction method for entering inclined rock of ultra-large diameter rotary drilling bored concrete pile is characterized by comprising the following steps of: the concave-convex connecting piece comprises a convex connecting piece welded at the bottom of the inner wall of the guide barrel and a concave connecting piece welded on the top surface of the barrel drill body and matched with the convex connecting piece.
The construction method for entering inclined rock of ultra-large diameter rotary drilling bored concrete pile is characterized by comprising the following steps of: the male connecting piece is L-shaped, the bottom of the horizontal part of the L-shaped male connecting piece is abutted on the top surface of the barrel drill body, and the outer side of the vertical part of the L-shaped male connecting piece is welded on the inner wall of the guide barrel.
The construction method for entering inclined rock of ultra-large diameter rotary drilling bored concrete pile is characterized by comprising the following steps of: the concave connecting piece is including mutual parallel arrangement's first curb plate and second curb plate, and the one side end of first curb plate and second curb plate is passed through the shrouding and is connected, and the roof is passed through the roof and is connected at the top of first curb plate and second curb plate, and the bottom welding of first curb plate and second curb plate is on barrel bore body top surface, first curb plate, second curb plate, shrouding and roof form the opening downwards and with the horizontal part complex recess of the convex connecting piece of L shape, be provided with a plurality of screw holes on the horizontal part of the convex connecting piece of L shape, offered a plurality of through-holes on the roof, the quantity of through-hole with the equal and one-to-one of quantity of screw hole, roof and barrel bore draw-in groove bottom edge position welding, connecting bolt stretch into through the through-hole to be connected concave connecting piece and convex connecting piece.
The construction method for entering inclined rock of ultra-large diameter rotary drilling bored concrete pile is characterized by comprising the following steps of: the ratio of the height of the guiding closing-in barrel to the height of the guiding barrel is 1:6, and the inclination angle of the side wall of the guiding closing-in barrel to the inner side direction of the barrel drill is 20-30 degrees.
The construction method for entering inclined rock of ultra-large diameter rotary drilling bored concrete pile is characterized by comprising the following steps of: the medium-sized guide barrel drill comprises a first medium-sized guide barrel drill and a second medium-sized guide barrel drill, the sizes of the first medium-sized guide barrel drill and the second medium-sized guide barrel drill are sequentially increased, reaming construction is conducted on the first medium-sized guide barrel drill and the second medium-sized guide barrel drill respectively, the outer diameter of a barrel drill body of the first medium-sized guide barrel drill is 0.6D-0.7D, and the outer diameter of a barrel drill body of the second medium-sized guide barrel drill is 0.7D-0.85D.
Compared with the prior art, the invention has the following advantages:
1. According to the invention, the guide barrel drill with the small size is utilized to drill the inclined rock surface from inside to outside, so that the problem that the perpendicularity of the drill hole is difficult to control due to the fact that the ultra-large diameter rotary drilling hole is directly drilled is avoided, and the popularization and the use are facilitated.
2. According to the invention, the gravity center of the barrel drill body is ensured to be provided with the guide barrel at the top under the condition that the gravity center of the barrel drill body is in the barrel drill body, the height of the barrel drill body is increased, the guidance property of the barrel drill is improved, and the guide closing barrel is arranged at the upper part of the guide barrel, so that the scouring disturbance to the hole wall can be effectively avoided after the height of the barrel drill body is increased, and the perpendicularity control of the barrel drill is easy; through evenly being provided with a plurality of back of body stupefied backup pads at direction bucket inner wall circumference, can effectively consolidate the hardness of upper portion direction bucket, avoid the barrel to bore the deformation that produces in boring the stratum, need not bore the welding with the bottom barrel, to barrel bore the destruction little, reliable stable, direction bucket bottom circumference evenly is provided with a plurality of thick liquid holes that overflow, reduces barrel and bores the interference that outside mud was bored for the barrel in-process, excellent in use effect.
3. The method has simple steps, the edge of the bottom of the barrel drill clamping groove at the center of the top of the barrel drill body is connected with the guide barrel and the barrel drill body through a plurality of concave-convex connecting pieces, so that the on-site operation and the timely replacement are convenient, the damage to the barrel drill body is small, and the manufacturing cost is low; the construction of rock entering and drilling of the inclined rock surface can ensure the whole process flow of pile forming, save time, improve construction efficiency and facilitate popularization and use.
In summary, the invention uses the guide barrel drill with small size from small to large to drill the inclined rock surface from inside to outside, thereby avoiding the problem that the drill perpendicularity is difficult to control caused by directly drilling the oversized-diameter rotary drilling hole, each guide barrel drill ensures that the guide barrel is arranged at the top of the barrel drill body under the condition that the gravity center of the barrel drill body is in the barrel drill body, increases the barrel height, improves the guidance quality of the barrel drill, and sets the guide closing barrel at the upper part of the guide barrel, thereby ensuring that the scouring disturbance to the hole wall can be effectively avoided after the height of the barrel body is increased, facilitating the control of the barrel drill perpendicularity and facilitating popularization and use.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
FIG. 1 is a diagram showing the construction effect of soil layer drilling.
Fig. 2 is a construction state diagram of inclined rock surface drilling by a small guide barrel drilling machine.
Fig. 3 is a construction state diagram of the small guide barrel drilling in place according to the present invention.
Fig. 4 is a construction state diagram of inclined rock surface drilling by using the middle-sized guide barrel drilling machine.
Fig. 5 is a construction state diagram of the middle-sized guide barrel according to the present invention.
Fig. 6 is a construction state diagram of the large-sized pilot barrel drill of the present invention.
Fig. 7 is a schematic structural view of the pilot barrel drill of the present invention.
Fig. 8 is a side view of the pilot barrel drill of the present invention.
FIG. 9 is a schematic view of the female connector of the present invention.
Fig. 10 is a flow chart of the method of the present invention.
Reference numerals illustrate:
1-barrel drill body; 2-a drill bit; 3-a guide barrel;
4, guiding a closing-in barrel; 5-a back ridge supporting plate; 6, a slurry overflow hole;
7, a barrel drill clamping groove; 8-male coupling; 9-female connector;
9-1-a first side plate; 9-2-a second side plate; 9-3, sealing plates;
9-4-top plate; 9-5-through holes; 10-connecting bolts;
11-soil layer; 12-rock formation; 13-inclined rock face;
14-drilling holes in soil layers; 15-small-sized guide barrel drill; 16-a first extended bore;
17-medium-sized guide barrel drill; 18-a second extension borehole; 19-large-scale guide barrel drill.
Detailed Description
As shown in fig. 1 to 10, the construction method for inserting the ultra-large diameter rotary drilling bored concrete pile into the inclined rock comprises the following steps:
Step one, drilling holes in soil layers: vertically drilling in the soil layer 11 by using a rotary drilling rig which meets the requirement of the drilling design size, obtaining a soil layer drilling hole 14 with an oversized diameter, wherein the diameter of the soil layer drilling hole 14 is more than 2.5 meters, and the hole bottom plane of the soil layer drilling hole 14 is contacted with the inclined rock surface 13 of the rock stratum 12;
Step two, drilling a first extension drilling hole: a small guide barrel drill 15 is arranged at the bottom of a drill rod of a rotary drilling rig, the small guide barrel drill 15 is utilized to drill from the center of the bottom of a hole of a soil layer drill hole 14, a soil layer at the bottom of the soil layer drill hole 14 enters an inclined rock surface 13 until drilling is in place, a first extension drill hole 16 is obtained, the diameter of the first extension drill hole 16 is 0.5D, and D is the diameter of the soil layer drill hole 14;
The first extension drilling hole 16 and the soil layer drilling hole 14 are coaxially arranged up and down;
Step three, drilling a second extension drilling hole: after the first extension drilling hole 16 is drilled in place, lifting the drill by the rotary drilling machine, removing the small guide barrel drill 15, installing a medium guide barrel drill 17 at the bottom of a drill rod of the rotary drilling machine, starting drilling from the center of the bottom of a hole of the soil layer drilling hole 14 by using the medium guide barrel drill 17, entering the inclined rock face 13 through the soil layer at the bottom of the soil layer drilling hole 14 until the drilling is in place, and obtaining a second extension drilling hole 18, wherein the diameter of the second extension drilling hole 18 is 0.6-0.85D, and the second extension drilling hole 18 is the equal-height widening reaming of the first extension drilling hole 16;
the second extension drilling hole 18 and the soil layer drilling hole 14 are coaxially arranged up and down;
drilling a third extension drilling hole: after the second extension drilling hole 18 is drilled in place, lifting the drill by the rotary drilling machine, removing the middle-sized guide barrel drill 17, installing a large-sized guide barrel drill 19 at the bottom of a drill rod of the rotary drilling machine, starting drilling from the center of the bottom of a hole of the soil layer drilling hole 14 by utilizing the large-sized guide barrel drill 19, entering the inclined rock surface 13 through the soil layer at the bottom of the soil layer drilling hole 14 until the drilling is in place, and obtaining a third extension drilling hole, wherein the diameter of the third extension drilling hole is equal to that of the soil layer drilling hole 14, and the third extension drilling hole is an equal-height widening reaming hole of the second extension drilling hole 18;
The third extension drilling hole and the soil layer drilling hole 14 are coaxially and vertically arranged in a penetrating way, and the third extension drilling hole and the soil layer drilling hole 14 are communicated to form an oversized-diameter rotary drilling hole;
The small-sized guide barrel drill 15, the medium-sized guide barrel drill 17 and the large-sized guide barrel drill 19 have the same structure, the size of the large-sized guide barrel drill 19 is larger than that of the medium-sized guide barrel drill 17, and the size of the medium-sized guide barrel drill 17 is larger than that of the small-sized guide barrel drill 15;
The small-sized guide barrel drill 15, the medium-sized guide barrel drill 17 and the large-sized guide barrel drill 19 comprise a barrel drill body 1, a drill bit 2 arranged at the bottom of the barrel drill body 1 and a guide barrel 3 welded at the top of the barrel drill body 1, the guide barrel 3 and the barrel drill body 1 are coaxially arranged, the guide barrel 3 is consistent with the inner diameter and the outer diameter of the barrel drill body 1, the guide closing barrel 4 is integrally welded at the top of the guide barrel 3, the upper opening size of the guide closing barrel 4 is smaller than the lower opening size of the guide closing barrel 4, a plurality of back edge supporting plates 5 are uniformly arranged on the inner wall of the guide barrel 3 in the circumferential direction, a plurality of pulp overflow holes 6 are uniformly arranged at the bottom of the guide barrel 3 in the circumferential direction, and the edge of the bottom of a barrel drill clamping groove 7 at the center of the top of the barrel drill body 1 is connected with the guide barrel 3 and the barrel drill body 1 through a plurality of concave-convex connecting pieces;
the ratio of the height of the guide barrel 3 to the height of the barrel drill body 1 is 1:3;
When the small-sized guide barrel drill 15, the medium-sized guide barrel drill 17 and the large-sized guide barrel drill 19 are used, a drill rod of the rotary drilling rig is connected with the barrel drill clamping groove 7, when the barrel drill body 1 drills by using the drill bit 2, the barrel drill body 1 and the guide barrel 3 are abutted against the wall of a drill hole, so that the gravity center of the barrel drill body 1 is ensured to increase the height of the barrel under the condition that the barrel drill body is internally provided, the guide performance of the barrel drill is improved, and the verticality of the ultra-large diameter rotary drilling hole is ensured;
Fifthly, placing a reinforcement cage in the ultra-large diameter rotary drilling hole for construction of the cast-in-place pile.
The guide barrel drill with the size from small to large is used for reaming and drilling the inclined rock surface from inside to outside, so that the problem that the perpendicularity of drilling is difficult to control due to direct drilling of the ultra-large diameter rotary drilling is avoided; the gravity center of the barrel drill body is guaranteed to be provided with the guide barrel at the top under the condition that the gravity center of the barrel drill body is in the barrel drill body, the height of the barrel drill body is increased, the guidance property of the barrel drill is improved, the guide closing barrel is arranged at the upper part of the guide barrel, the barrel drill body is guaranteed to be increased in height, scouring disturbance to the hole wall can be effectively avoided, and the perpendicularity control of the barrel drill is easy; the plurality of back ridge supporting plates are uniformly arranged on the circumference of the inner wall of the guide barrel, so that the hardness of the guide barrel at the upper part can be effectively reinforced, deformation of the barrel drill in a drilling stratum is avoided, welding with a bottom barrel drill is not needed, damage to the barrel drill is small, reliability and stability are realized, a plurality of slurry overflow holes are uniformly arranged on the circumference of the bottom of the guide barrel, and interference of external slurry to the barrel drill in the barrel drilling process is reduced; the method has simple steps, the edge of the bottom of the barrel drill clamping groove at the center of the top of the barrel drill body is connected with the guide barrel and the barrel drill body through a plurality of concave-convex connecting pieces, so that the on-site operation and the timely replacement are convenient, the damage to the barrel drill body is small, and the manufacturing cost is low; the construction of rock entering and drilling of the inclined rock surface can ensure the whole process flow of pile forming, save time and improve construction efficiency.
In this embodiment, the back edge support plate 5 is a right-angle triangular back edge support plate, one right-angle side of the right-angle triangular back edge support plate is abutted to the top surface of the barrel drill body 1, and the other right-angle side of the right-angle triangular back edge support plate is welded to the inner wall of the guide barrel 3.
It should be noted that, the stupefied backup pad of right angle triangle back plays effectively to the reinforcement support of guide cylinder 3, and the vertical right angle avris welding of stupefied backup pad of right angle triangle back is on the inner wall of guide cylinder 3, and when guide cylinder 3 inwards inclines, the level of stupefied backup pad of right angle triangle back is to right angle avris butt at barrel drill body 1 top surface, and guide cylinder 3 does not have the clearance of slope, and a right angle avris butt of stupefied backup pad of right angle triangle back is not with barrel drill body 1 top surface welding on barrel drill body 1 top surface, guarantees that later stage change is swift, and is little to barrel drill body influence.
In this embodiment, the male and female connectors include male connectors 8 welded to the bottom of the inner wall of the guide barrel 3 and female connectors 9 welded to the top surface of the barrel drill body 1 and engaged with the male connectors 8.
In this embodiment, the male connector 8 is an L-shaped male connector, the bottom of the horizontal portion of the L-shaped male connector abuts against the top surface of the barrel drill body 1, and the outer side of the vertical portion of the L-shaped male connector is welded on the inner wall of the guide barrel 3.
It should be noted that, the vertical part outside welding of the convex connecting piece of L shape is on the inner wall of direction bucket 3, effectively realizes the effective connection with direction bucket 3 when strengthening support to direction bucket 3 bottom, and the horizontal part bottom butt of the convex connecting piece of L shape is not with barrel drill body 1 top surface welding on barrel drill body 1 top surface, guarantees that later replacement is swift, and is little to barrel drill body influence.
In this embodiment, the female connecting member 9 includes a first side plate 9-1 and a second side plate 9-2 that are disposed parallel to each other, one side ends of the first side plate 9-1 and the second side plate 9-2 are connected by a sealing plate 9-3, tops of the first side plate 9-1 and the second side plate 9-2 are connected by a top plate 9-4, bottoms of the first side plate 9-1 and the second side plate 9-2 are welded on a top surface of the barrel drill body 1, the first side plate 9-1, the second side plate 9-2, the sealing plate 9-3 and the top plate 9-4 form a groove that is opened downward and is matched with a horizontal portion of the L-shaped male connecting member, a plurality of threaded holes are formed in the horizontal portion of the L-shaped male connecting member, a plurality of through holes 9-5 are formed in the top plate 9-4, the number of through holes 9-5 is equal to and corresponds to that of the threaded holes one by one, the top plate 9-4 is welded to a bottom edge position of the barrel drill clamping groove 7, and the connecting bolt 10 extends into the female connecting member 9 and the male connecting member 8 through the through holes 9-5.
It should be noted that, the concave connecting piece 9 is effectively connected with the barrel drill clamping groove 7, the first side plate 9-1, the second side plate 9-2, the sealing plate 9-3 and the top plate 9-4 form a groove with a downward opening, and the groove is matched with the horizontal part of the L-shaped convex connecting piece, so that reliable and stable connection of the guide barrel 3, the barrel drill clamping groove 7 and the barrel drill body 1 is ensured, the bottoms of the first side plate 9-1 and the second side plate 9-2 of the concave connecting piece 9 are welded on the top surface of the barrel drill body 1, and the influence on the barrel drill body is reduced.
In this embodiment, the ratio of the height of the guiding and closing barrel 4 to the height of the guiding barrel 3 is 1:6, and the inclination angle of the side wall of the guiding and closing barrel 4 to the inner side direction of the barrel drill is 20 ° to 30 °.
In this embodiment, the middle-sized guiding barrel drill 17 includes a first middle-sized guiding barrel drill and a second middle-sized guiding barrel drill with sequentially increased sizes, the first middle-sized guiding barrel drill and the second middle-sized guiding barrel drill respectively perform a reaming operation, the outer diameter of the barrel drill body 1 of the first middle-sized guiding barrel drill is 0.6D-0.7D, and the outer diameter of the barrel drill body 1 of the second middle-sized guiding barrel drill is 0.7D-0.85D.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any simple modification, variation and equivalent structural changes made to the above embodiment according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (7)
1. The construction method for entering inclined rock of ultra-large diameter rotary drilling bored concrete pile is characterized by comprising the following steps:
step one, drilling holes in soil layers: vertically drilling in a soil layer (11) by using a rotary drilling rig which meets the requirement of the drilling design size, obtaining a soil layer drilling hole (14) with an oversized diameter, wherein the diameter of the soil layer drilling hole (14) is more than 2.5 meters, and the hole bottom plane of the soil layer drilling hole (14) is contacted with an inclined rock surface (13) of a rock stratum (12);
Step two, drilling a first extension drilling hole: a small guide barrel drill (15) is arranged at the bottom of a drill rod of a rotary drilling rig, the small guide barrel drill (15) is used for drilling from the center of the bottom of a hole of a soil layer drill hole (14), a soil layer passing through the bottom of the soil layer drill hole (14) enters an inclined rock surface (13) until drilling is in place, a first extension drill hole (16) is obtained, and the diameter of the first extension drill hole (16) is 0.5D, wherein D is the diameter of the soil layer drill hole (14);
The first extension drilling holes (16) and the soil layer drilling holes (14) are coaxially arranged up and down;
step three, drilling a second extension drilling hole: after a first extension drilling hole (16) is drilled in place, lifting the drilling by a rotary drilling machine, removing a small guide barrel drilling hole (15), installing a medium guide barrel drilling hole (17) at the bottom of a drill rod of the rotary drilling machine, starting drilling from the center of the bottom of a hole of a soil layer drilling hole (14) by using the medium guide barrel drilling hole (17), entering an inclined rock surface (13) through the soil layer at the bottom of the soil layer drilling hole (14) until the drilling is in place, and obtaining a second extension drilling hole (18), wherein the diameter of the second extension drilling hole (18) is 0.6-0.85D, and the second extension drilling hole (18) is the equal-height and wide reaming of the first extension drilling hole (16);
the second extension drilling holes (18) and the soil layer drilling holes (14) are coaxially arranged up and down;
Drilling a third extension drilling hole: after the second extension drilling hole (18) is drilled in place, lifting the drill by the rotary drilling machine, removing the middle-sized guide barrel drill (17), installing a large-sized guide barrel drill (19) at the bottom of a drill rod of the rotary drilling machine, starting drilling from the center of the bottom of a hole of the soil layer drilling hole (14) by utilizing the large-sized guide barrel drill (19), entering an inclined rock surface (13) through the soil layer at the bottom of the soil layer drilling hole (14) until the drilling is in place, and obtaining a third extension drilling hole, wherein the diameter of the third extension drilling hole is equal to the diameter of the soil layer drilling hole (14), and the third extension drilling hole is an equal-height and wide reaming of the second extension drilling hole (18);
The third extension drilling hole and the soil layer drilling hole (14) are coaxially and vertically arranged in a penetrating mode, and an oversized-diameter rotary drilling hole is formed after the third extension drilling hole and the soil layer drilling hole (14) are communicated;
The small-sized guide barrel drill (15), the medium-sized guide barrel drill (17) and the large-sized guide barrel drill (19) are identical in structure, the size of the large-sized guide barrel drill (19) is larger than that of the medium-sized guide barrel drill (17), and the size of the medium-sized guide barrel drill (17) is larger than that of the small-sized guide barrel drill (15);
The small-sized guide barrel drill (15), the medium-sized guide barrel drill (17) and the large-sized guide barrel drill (19) comprise a barrel drill body (1), a drill bit (2) arranged at the bottom of the barrel drill body (1) and a guide barrel (3) welded at the top of the barrel drill body (1), the guide barrel (3) and the barrel drill body (1) are coaxially arranged, the guide barrel (3) is consistent with the inner diameter and the outer diameter of the barrel drill body (1), the guide closing barrel (4) is integrally welded at the top of the guide barrel (3), the upper opening size of the guide closing barrel (4) is smaller than the lower opening size of the guide closing barrel, a plurality of back edge supporting plates (5) are uniformly arranged on the inner wall of the guide barrel (3) in the circumferential direction, a plurality of pulp overflow holes (6) are uniformly arranged on the bottom of the guide barrel (3), and the edge position of the bottom of a barrel drill clamping groove (7) in the center of the top of the barrel drill body (1) is connected with the guide barrel (3) and the barrel drill body (1) through a plurality of concave-convex connectors;
The ratio of the height of the guide barrel (3) to the height of the barrel drill body (1) is 1:3;
When the small-sized guide barrel drill (15), the medium-sized guide barrel drill (17) and the large-sized guide barrel drill (19) are used, a drill rod of the rotary drilling rig is connected with the barrel drill clamping groove (7), when the barrel drill body (1) drills by using the drill bit (2), the barrel drill body (1) and the guide barrel (3) are abutted against the wall of a drill hole, so that the height of the barrel body is increased under the condition that the gravity center of the barrel drill body (1) is in the barrel drill body, the guidance quality of the barrel drill is improved, and the perpendicularity of the ultra-large diameter rotary drilling hole is ensured;
Fifthly, placing a reinforcement cage in the ultra-large diameter rotary drilling hole for construction of the cast-in-place pile.
2. The construction method for entering inclined rock of ultra-large diameter rotary drilling bored concrete pile according to claim 1, wherein the construction method comprises the following steps: the back edge support plate (5) is a right-angle triangular back edge support plate, one right-angle side of the right-angle triangular back edge support plate is abutted to the top surface of the barrel drill body (1), and the other right-angle side of the right-angle triangular back edge support plate is welded to the inner wall of the guide barrel (3).
3. The construction method for entering inclined rock of ultra-large diameter rotary drilling bored concrete pile according to claim 1, wherein the construction method comprises the following steps: the concave-convex connecting piece comprises a convex connecting piece (8) welded at the bottom of the inner wall of the guide barrel (3) and a concave connecting piece (9) welded on the top surface of the barrel drill body (1) and matched with the convex connecting piece (8).
4. A construction method for entering inclined rock of ultra-large diameter rotary drilling bored concrete pile according to claim 3, which is characterized by comprising the following steps: the male connecting piece (8) is an L-shaped male connecting piece, the bottom of the horizontal part of the L-shaped male connecting piece is abutted on the top surface of the barrel drill body (1), and the outer side of the vertical part of the L-shaped male connecting piece is welded on the inner wall of the guide barrel (3).
5. The construction method for entering inclined rock of ultra-large diameter rotary drilling bored concrete pile according to claim 4, which is characterized by comprising the following steps: the female connecting piece (9) comprises a first side plate (9-1) and a second side plate (9-2) which are arranged in parallel, one side ends of the first side plate (9-1) and the second side plate (9-2) are connected through a sealing plate (9-3), the tops of the first side plate (9-1) and the second side plate (9-2) are connected through a top plate (9-4), the bottoms of the first side plate (9-1) and the second side plate (9-2) are welded on the top surface of the barrel drilling body (1), the first side plate (9-1), the second side plate (9-2), the sealing plate (9-3) and the top plate (9-4) form grooves which are downward in opening and matched with the horizontal parts of the L-shaped male connecting piece, a plurality of threaded holes are formed in the horizontal parts of the L-shaped male connecting piece, the top plate (9-4) are provided with a plurality of through holes (9-5), the number of the through holes is equal to and corresponds to the number of the threaded holes, the top plate (9-4) and the bottom clamping groove (7) are welded on the top plate (9-4) and the bottom clamping groove (7) are connected into the female connecting piece (9-8) through the threaded holes.
6. The construction method for entering inclined rock of ultra-large diameter rotary drilling bored concrete pile according to claim 1, wherein the construction method comprises the following steps: the ratio of the height of the guiding closing-in barrel (4) to the height of the guiding barrel (3) is 1:6, and the inclination angle of the side wall of the guiding closing-in barrel (4) to the inner side direction of the barrel drill is 20-30 degrees.
7. The construction method for entering inclined rock of ultra-large diameter rotary drilling bored concrete pile according to claim 1, wherein the construction method comprises the following steps: the medium-sized guide barrel drill (17) comprises a first medium-sized guide barrel drill and a second medium-sized guide barrel drill which are sequentially increased in size, the first medium-sized guide barrel drill and the second medium-sized guide barrel drill are respectively subjected to primary reaming construction, the outer diameter of a barrel drill body (1) of the first medium-sized guide barrel drill is 0.6D-0.7D, and the outer diameter of a barrel drill body (1) of the second medium-sized guide barrel drill is 0.7D-0.85D.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101270577A (en) * | 2008-03-04 | 2008-09-24 | 中国建筑第六工程局有限公司 | Construction method for large-diameter ultra-deep rock borehole bottom-expanding filling pile |
| CN104295239A (en) * | 2014-09-29 | 2015-01-21 | 中铁建设投资集团有限公司 | Method for using rotary drilling rig to drill into hard rock stratum |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101139466B1 (en) * | 2011-09-08 | 2012-04-30 | 주식회사 한국종합기술 | Construction method of foundation of bridge |
| CN104831708A (en) * | 2015-03-20 | 2015-08-12 | 深圳市工勘岩土集团有限公司 | Foundation excavation retaining and protecting cast-in-situ bored pile construction method and equipment thereof |
| CN112962581B (en) * | 2021-03-08 | 2023-01-20 | 中国建筑一局(集团)有限公司 | Construction method of ultra-deep underground continuous wall structure in sea-filling inclined rock area |
| CN113738266B (en) * | 2021-08-27 | 2023-07-21 | 中交第二航务工程局有限公司 | Multi-stage drill bit fractional drilling pore-forming method of combined rotary drilling rig |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101270577A (en) * | 2008-03-04 | 2008-09-24 | 中国建筑第六工程局有限公司 | Construction method for large-diameter ultra-deep rock borehole bottom-expanding filling pile |
| CN104295239A (en) * | 2014-09-29 | 2015-01-21 | 中铁建设投资集团有限公司 | Method for using rotary drilling rig to drill into hard rock stratum |
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