CN113026728A - Rock-socketed pile construction method of XG360 rotary drilling rig for deep-buried hard rock stratum - Google Patents
Rock-socketed pile construction method of XG360 rotary drilling rig for deep-buried hard rock stratum Download PDFInfo
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- 238000010276 construction Methods 0.000 title claims abstract description 71
- 239000011435 rock Substances 0.000 title claims abstract description 68
- 238000005553 drilling Methods 0.000 title claims abstract description 39
- 238000013461 design Methods 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 19
- 238000005516 engineering process Methods 0.000 claims abstract description 11
- 230000008859 change Effects 0.000 claims abstract description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 48
- 239000010959 steel Substances 0.000 claims description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 230000002787 reinforcement Effects 0.000 claims description 20
- 239000002002 slurry Substances 0.000 claims description 18
- 239000002689 soil Substances 0.000 claims description 14
- 238000004140 cleaning Methods 0.000 claims description 12
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 8
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 8
- 239000003513 alkali Substances 0.000 claims description 8
- 239000000440 bentonite Substances 0.000 claims description 8
- 229910000278 bentonite Inorganic materials 0.000 claims description 8
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 8
- 239000001913 cellulose Substances 0.000 claims description 8
- 229920002678 cellulose Polymers 0.000 claims description 8
- 229920005610 lignin Polymers 0.000 claims description 8
- 239000002893 slag Substances 0.000 claims description 8
- 229910052708 sodium Inorganic materials 0.000 claims description 8
- 239000011734 sodium Substances 0.000 claims description 8
- 238000012360 testing method Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 6
- 230000009286 beneficial effect Effects 0.000 claims description 5
- 238000011161 development Methods 0.000 claims description 5
- 208000010392 Bone Fractures Diseases 0.000 claims description 4
- 206010017076 Fracture Diseases 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- JPNWDVUTVSTKMV-UHFFFAOYSA-N cobalt tungsten Chemical compound [Co].[W] JPNWDVUTVSTKMV-UHFFFAOYSA-N 0.000 claims description 4
- 238000005056 compaction Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 4
- 238000007667 floating Methods 0.000 claims description 4
- 230000036541 health Effects 0.000 claims description 4
- 238000007689 inspection Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 239000011148 porous material Substances 0.000 claims description 4
- 239000013049 sediment Substances 0.000 claims description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 4
- 235000017550 sodium carbonate Nutrition 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- 230000008901 benefit Effects 0.000 abstract description 16
- 238000003912 environmental pollution Methods 0.000 description 6
- 230000005611 electricity Effects 0.000 description 2
- 238000003973 irrigation Methods 0.000 description 2
- 238000009527 percussion Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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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
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B3/00—Rotary drilling
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0037—Clays
- E02D2300/004—Bentonite or bentonite-like
- E02D2300/0043—Bentonite or bentonite-like with other ingredients
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/20—Miscellaneous comprising details of connection between elements
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Paleontology (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a rock-socketed pile construction method of a XG360 rotary drilling rig for deeply burying a hard rock stratum, which comprises the following steps: the method comprises the following steps: designing and intersecting bottoms by a design unit before engineering construction, and when the construction unit finds that a construction drawing has errors, providing a design change requirement to the design unit in time; step two: technical responsible personnel should lead the engineering technical personnel to compile deeply buried hard rock stratum rock-socketed pile special construction scheme according to the design drawing, and carry out the technology to technical personnel and team leaders, study the engineering geology and hydrology condition before the construction, carefully analyze the geological survey report provided by the design, carry out the comprehensive analysis to the engineering geology; step three: the construction site is reasonably arranged according to the designed pile position, and the four-way pipe is flat. The rock-socketed pile construction method of the XG360 rotary drilling rig for the deep-buried hard rock stratum saves resources, reduces cost of construction from head exploration, is simple to operate, can accurately position, can shorten construction time, and has obvious economic benefit.
Description
Technical Field
The invention belongs to the technical field of civil engineering, and particularly relates to a construction method of a rock-socketed pile of a XG360 rotary drilling rig for deeply burying a hard rock stratum.
Background
With the development of urban construction, especially the acceleration of old city transformation, pipeline burying projects of various pipe diameters are continuously increased, and a deep foundation (see a figure) consisting of piles and pile bearing platforms (bearing platforms for short) connected with pile tops or a single-pile foundation (pile foundation for short) connected with pile foundations through piles is provided. If the pile body is completely buried in the soil and the bottom surface of the bearing platform is contacted with the soil body, the pile body is called a low bearing platform pile foundation; when the upper part of the pile body is exposed out of the ground and the bottom of the pile cap is positioned above the ground, the pile body is called a high pile cap pile foundation. The building pile foundation is generally a low-bearing platform pile foundation, and the pile foundation is widely applied in high-rise buildings. The rock-socketed pile construction method of the existing XG360 rotary drilling rig for the deep-buried hard rock stratum has the advantages of complex operation, inaccurate positioning, unobvious economic benefit, and incapability of reducing construction cost and environmental pollution.
Disclosure of Invention
The invention aims to provide a rock-socketed pile construction method of a XG360 rotary drilling rig for a deep-buried hard rock stratum, and aims to solve the problems that the existing rock-socketed pile construction method of the XG360 rotary drilling rig for the deep-buried hard rock stratum, which is proposed in the background art, is complex to operate, cannot accurately position, cannot shorten the construction time, is not obvious in economic benefit, cannot reduce the construction cost and reduce the environmental pollution.
In order to achieve the purpose, the invention provides the following technical scheme: the construction method of the rock-socketed pile of the XG360 rotary drilling rig for deeply burying the hard rock stratum comprises the following specific steps:
the method comprises the following steps: designing and intersecting bottoms by a design unit before engineering construction, and when the construction unit finds that a construction drawing has errors, providing a design change requirement to the design unit in time;
step two: technical responsible personnel should lead the engineering technical personnel to compile deeply buried hard rock stratum rock-socketed pile special construction scheme according to the design drawing, and carry out the technology to technical personnel and team leaders, study the engineering geology and hydrology condition before the construction, carefully analyze the geological survey report provided by the design, carry out the comprehensive analysis to the engineering geology;
step three: reasonably arranging a construction site according to the designed pile position, leveling a compaction cross joint, arranging a pile machine chassis on a solid foundation, and for a soft foundation, replacing soft soil and ramming to be compact;
step four: the pile foundation steel casing adopts a pit digging method, the steel casing is embedded and lofted through a positioned control pile, so that the center of the steel casing is coincided with the center of a drilled hole, meanwhile, a horizontal ruler or a vertical ball is used for checking, so that the plane position and the verticality of the steel casing are accurate, and the height of the steel casing is 1.5m-2.0 m;
step five: preparing a slurry pool, installing a slurry pump, and preparing slurry by adopting water, bentonite, CNC (sodium cellulose) and lignin family decomposer alkali (Na2CO 3);
step six: before pore-forming, drilling by adopting a small-diameter rock-embedded cylinder drill, loosening the circumference of a rock core in a pore, and increasing the free surface of a rock stratum so as to reduce the stress level of the rock stratum, thereby being beneficial to the one-step drilling of the large-diameter cylinder drill and improving the working efficiency of the large-diameter cylinder drill;
step seven: then, a short spiral drill bit is used for crushing a rock core to create a crushing free surface, a 1.5m non-coring rock embedding cylinder type is used for drilling a one-step loose rock surface, and finally a 2.0m rock embedding rotary drill bit is used for drilling and slag removal to achieve the purpose of efficient rock entering;
step eight: when the final hole depth is reached, cleaning sediment at the bottom of the hole by using a bottom cleaning drill bit, stopping for 20-30min to precipitate suspended matters in the slurry, fishing out by using the drill bit to finish the first hole cleaning, and measuring the hole forming depth by using a measuring rope;
step nine: after having gone down the steel reinforcement cage, carry out the clear hole of secondary, the concrete under water of pouring, pile foundation concrete placement accomplishes the back, in time clears up pile bolsters, and whether inspection pile foundation sounding pipe is unobstructed, treats that pile foundation concrete reaches the health preserving period after, carries out ultrasonic detection.
Furthermore, in the second step, for engineering geology with geological hardness less than 5Mpa, soil indexes such as hydrogeological structure parameters and the like can be known during analysis; for lithology, the cause and type of rock, the size and shape of rock particles, rock structure and fracture development, the nature of cementation and the form of cementation are known.
Further, in the fifth step, the mixture ratio of water, bentonite, CNC (sodium cellulose) and lignin group decomposer alkali (Na2CO3) is as follows: 100:6:0.8:3.
And furthermore, the bucket teeth of the seventh medium-short spiral drill bit adopt bullet heads with tungsten-cobalt hard alloy inlaid at the heads, and the bucket teeth adopt tooth teeth to drill and take slag.
Furthermore, the underwater concrete pouring in the ninth step adopts a vertical lift conduit method, the conduit is pre-spliced and subjected to a water filling test before use, and the pressure during the water filling test is not less than 1.5 times of the maximum pressure possibly borne by the conduit wall during the concrete pouring.
Furthermore, the steel reinforcement cage is lengthened by adopting a straight thread sleeve to connect, the steel reinforcement cage is sunk after being lengthened section by section, and the steel reinforcement cage is fixed by welding steel lugs on the inner wall of the steel casing after being sunk to the designed elevation, so that the steel reinforcement cage is prevented from deviating or floating in the concrete pouring process.
Compared with the prior art, the invention has the beneficial effects that:
(1) compared with the traditional percussion drilling hole forming and high-power rotary drilling machine hole forming, the technology greatly shortens the construction time, has obvious economic benefit, and has very high verticality precision of a hole forming part, thereby greatly reducing the construction allowance reserved for ensuring the net size in a pile hole, reducing the waste, ensuring the integrity of the pile by adopting long pile casing construction, reducing the over-irrigation amount and having good quality benefit.
(2) The technology replaces the water medium pore-forming and soil-taking technology in the process, and the requirement and the discharge of slurry are greatly reduced. The soil is taken out and transported along with the soil, so that the field is saved, other operation and construction are facilitated, meanwhile, the transportation cost, the water cost and the electricity cost are saved, the construction cost is reduced, and the environmental pollution is reduced; the most important advantages are low noise, small vibration and little influence on surrounding residents.
(3) The rock-socketed pile construction method of the XG360 rotary drilling rig for the deep-buried hard rock stratum has the advantages that resources are saved, the cost of construction from the beginning is reduced, the operation is simple, the positioning can be accurately carried out, the construction time can be shortened, the economic benefit is obvious, the construction cost can be reduced, the environmental pollution is reduced, and the social benefit is also obvious.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Example 1
The construction method of the rock-socketed pile of the XG360 rotary drilling rig for deeply burying the hard rock stratum comprises the following specific steps:
the method comprises the following steps: designing and intersecting bottoms by a design unit before engineering construction, and when the construction unit finds that a construction drawing has errors, providing a design change requirement to the design unit in time;
step two: technical responsible personnel should lead the engineering technical personnel to compile deeply buried hard rock stratum rock-socketed pile special construction scheme according to the design drawing, and carry out the technology to technical personnel and team leaders, study the engineering geology and hydrology condition before the construction, carefully analyze the geological survey report provided by the design, carry out the comprehensive analysis to the engineering geology;
step three: reasonably arranging a construction site according to the designed pile position, leveling a compaction cross joint, arranging a pile machine chassis on a solid foundation, and for a soft foundation, replacing soft soil and ramming to be compact;
step four: the pile foundation steel casing adopts a pit digging method, the steel casing is embedded and lofted through a positioned control pile, so that the center of the steel casing is coincided with the center of a drilled hole, meanwhile, a horizontal ruler or a vertical ball is used for checking, so that the plane position and the verticality of the steel casing are accurate, and the height of the steel casing is 1.5m-2.0 m;
step five: preparing a slurry pool, installing a slurry pump, and preparing slurry by adopting water, bentonite, CNC (sodium cellulose) and lignin family decomposer alkali (Na2CO 3);
step six: before pore-forming, drilling by adopting a small-diameter rock-embedded cylinder drill, loosening the circumference of a rock core in a pore, and increasing the free surface of a rock stratum so as to reduce the stress level of the rock stratum, thereby being beneficial to the one-step drilling of the large-diameter cylinder drill and improving the working efficiency of the large-diameter cylinder drill;
step seven: then, a short spiral drill bit is used for crushing a rock core to create a crushing free surface, a 1.5m non-coring rock embedding cylinder type is used for drilling a one-step loose rock surface, and finally a 2.0m rock embedding rotary drill bit is used for drilling and slag removal to achieve the purpose of efficient rock entering;
step eight: when the final hole depth is reached, cleaning sediment at the bottom of the hole by using a bottom cleaning drill bit, stopping for 20-30min to precipitate suspended matters in the slurry, fishing out by using the drill bit to finish the first hole cleaning, and measuring the hole forming depth by using a measuring rope;
step nine: after having gone down the steel reinforcement cage, carry out the clear hole of secondary, the concrete under water of pouring, pile foundation concrete placement accomplishes the back, in time clears up pile bolsters, and whether inspection pile foundation sounding pipe is unobstructed, treats that pile foundation concrete reaches the health preserving period after, carries out ultrasonic detection.
Wherein, in the second step, for engineering geology with geological hardness less than 5Mpa, the soil indexes such as hydrogeological structure parameters and the like can be known during analysis; for lithology, the cause and type of rock, the size and shape of rock particles, rock structure and fracture development, the nature of cementation and the form of cementation are known.
In the fifth step, the mixture ratio of water, bentonite, CNC (sodium cellulose) and lignin decomposer alkali (Na2CO3) is as follows: 100:6:0.8:3.
And seventhly, adopting a bullet head with a tungsten-cobalt hard alloy embedded at the head part of a bucket tooth of the middle-short spiral drill bit, and adopting tooth teeth to drill and take slag.
And C, pouring the underwater concrete in the step nine by adopting a vertical lifting guide pipe method, pre-splicing and water filling tests are carried out on the guide pipe before the guide pipe is used, and the pressure during the water filling test is not less than 1.5 times of the maximum pressure possibly borne by the guide pipe wall during pouring the concrete.
And C, in the ninth step, the steel reinforcement cage is lengthened by adopting a straight thread sleeve to be connected, the steel reinforcement cage sinks after being lengthened section by section, and the steel reinforcement cage is fixed by welding steel oxcles on the inner wall of the steel casing after being sunk to the designed elevation, so that the steel reinforcement cage is prevented from deviating or floating in the concrete pouring process.
Example 2
The construction method of the rock-socketed pile of the XG360 rotary drilling rig for deeply burying the hard rock stratum comprises the following specific steps:
the method comprises the following steps: designing and intersecting bottoms by a design unit before engineering construction, and when the construction unit finds that a construction drawing has errors, providing a design change requirement to the design unit in time;
step two: technical responsible personnel should lead the engineering technical personnel to compile deeply buried hard rock stratum rock-socketed pile special construction scheme according to the design drawing, and carry out the technology to technical personnel and team leaders, study the engineering geology and hydrology condition before the construction, carefully analyze the geological survey report provided by the design, carry out the comprehensive analysis to the engineering geology;
step three: reasonably arranging a construction site according to the designed pile position, leveling a compaction cross joint, arranging a pile machine chassis on a solid foundation, and for a soft foundation, replacing soft soil and ramming to be compact;
step four: the pile foundation steel casing adopts a pit digging method, the steel casing is embedded and lofted through a positioned control pile, so that the center of the steel casing is coincided with the center of a drilled hole, meanwhile, a horizontal ruler or a vertical ball is used for checking, so that the plane position and the verticality of the steel casing are accurate, and the height of the steel casing is 1.5m-2.0 m;
step five: preparing a slurry pool, installing a slurry pump, and preparing slurry by adopting water, bentonite, CNC (sodium cellulose) and lignin family decomposer alkali (Na2CO 3);
step six: before pore-forming, drilling by adopting a small-diameter rock-embedded cylinder drill, loosening the circumference of a rock core in a pore, and increasing the free surface of a rock stratum so as to reduce the stress level of the rock stratum, thereby being beneficial to the one-step drilling of the large-diameter cylinder drill and improving the working efficiency of the large-diameter cylinder drill;
step seven: then, a short spiral drill bit is used for crushing a rock core to create a crushing free surface, a 1.5m non-coring rock embedding cylinder type is used for drilling a one-step loose rock surface, and finally a 2.0m rock embedding rotary drill bit is used for drilling and slag removal to achieve the purpose of efficient rock entering;
step eight: when the final hole depth is reached, cleaning sediment at the bottom of the hole by using a bottom cleaning drill bit, stopping for 20-30min to precipitate suspended matters in the slurry, fishing out by using the drill bit to finish the first hole cleaning, and measuring the hole forming depth by using a measuring rope;
step nine: after having gone down the steel reinforcement cage, carry out the clear hole of secondary, the concrete under water of pouring, pile foundation concrete placement accomplishes the back, in time clears up pile bolsters, and whether inspection pile foundation sounding pipe is unobstructed, treats that pile foundation concrete reaches the health preserving period after, carries out ultrasonic detection.
Wherein, in the second step, for engineering geology with geological hardness less than 5Mpa, the soil indexes such as hydrogeological structure parameters and the like can be known during analysis; for lithology, the cause and type of rock, the size and shape of rock particles, rock structure and fracture development, the nature of cementation and the form of cementation are known.
In the fifth step, the mixture ratio of water, bentonite, CNC (sodium cellulose) and lignin decomposer alkali (Na2CO3) is as follows: 100:15:0.8:3.
And seventhly, adopting a bullet head with a tungsten-cobalt hard alloy embedded at the head part of a bucket tooth of the middle-short spiral drill bit, and adopting tooth teeth to drill and take slag.
And C, pouring the underwater concrete in the step nine by adopting a vertical lifting guide pipe method, pre-splicing and water filling tests are carried out on the guide pipe before the guide pipe is used, and the pressure during the water filling test is not less than 1.5 times of the maximum pressure possibly borne by the guide pipe wall during pouring the concrete.
And C, in the ninth step, the steel reinforcement cage is lengthened by adopting a straight thread sleeve to be connected, the steel reinforcement cage sinks after being lengthened section by section, and the steel reinforcement cage is fixed by welding steel oxcles on the inner wall of the steel casing after being sunk to the designed elevation, so that the steel reinforcement cage is prevented from deviating or floating in the concrete pouring process.
When the invention works: compared with the traditional percussion drilling hole forming and high-power rotary drilling machine hole forming, the technology greatly shortens the construction time, has obvious economic benefit, and has very high verticality precision of a hole forming part, thereby greatly reducing the construction allowance reserved for ensuring the net size in a pile hole, reducing the waste, ensuring the integrity of the pile by adopting long pile casing construction, reducing the over-irrigation amount and having good quality benefit. The technology replaces the water medium pore-forming and soil-taking technology in the process, and the requirement and the discharge of slurry are greatly reduced. The soil is taken out and transported along with the soil, so that the field is saved, other operation and construction are facilitated, meanwhile, the transportation cost, the water cost and the electricity cost are saved, the construction cost is reduced, and the environmental pollution is reduced; the most important advantages are low noise, small vibration and little influence on surrounding residents. The rock-socketed pile construction method of the XG360 rotary drilling rig for the deep-buried hard rock stratum has the advantages that resources are saved, the cost of construction from the beginning is reduced, the operation is simple, the positioning can be accurately carried out, the construction time can be shortened, the economic benefit is obvious, the construction cost can be reduced, the environmental pollution is reduced, and the social benefit is also obvious.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The construction method of the rock-socketed pile of the XG360 rotary drilling rig for deeply burying the hard rock stratum is characterized by comprising the following steps:
the method comprises the following steps: designing and intersecting bottoms by a design unit before engineering construction, and when the construction unit finds that a construction drawing has errors, providing a design change requirement to the design unit in time;
step two: technical responsible personnel should lead the engineering technical personnel to compile deeply buried hard rock stratum rock-socketed pile special construction scheme according to the design drawing, and carry out the technology to technical personnel and team leaders, study the engineering geology and hydrology condition before the construction, carefully analyze the geological survey report provided by the design, carry out the comprehensive analysis to the engineering geology;
step three: reasonably arranging a construction site according to the designed pile position, leveling a compaction cross joint, arranging a pile machine chassis on a solid foundation, and for a soft foundation, replacing soft soil and ramming to be compact;
step four: the pile foundation steel casing adopts a pit digging method, the steel casing is embedded and lofted through a positioned control pile, so that the center of the steel casing is coincided with the center of a drilled hole, meanwhile, a horizontal ruler or a vertical ball is used for checking, so that the plane position and the verticality of the steel casing are accurate, and the height of the steel casing is 1.5m-2.0 m;
step five: preparing a slurry pool, installing a slurry pump, and preparing slurry by adopting water, bentonite, CNC (sodium cellulose) and lignin family decomposer alkali (Na2CO 3);
step six: before pore-forming, drilling by adopting a small-diameter rock-embedded cylinder drill, loosening the circumference of a rock core in a pore, and increasing the free surface of a rock stratum so as to reduce the stress level of the rock stratum, thereby being beneficial to the one-step drilling of the large-diameter cylinder drill and improving the working efficiency of the large-diameter cylinder drill;
step seven: then, a short spiral drill bit is used for crushing a rock core to create a crushing free surface, a 1.5m non-coring rock embedding cylinder type is used for drilling a one-step loose rock surface, and finally a 2.0m rock embedding rotary drill bit is used for drilling and slag removal to achieve the purpose of efficient rock entering;
step eight: when the final hole depth is reached, cleaning sediment at the bottom of the hole by using a bottom cleaning drill bit, stopping for 20-30min to precipitate suspended matters in the slurry, fishing out by using the drill bit to finish the first hole cleaning, and measuring the hole forming depth by using a measuring rope;
step nine: after having gone down the steel reinforcement cage, carry out the clear hole of secondary, the concrete under water of pouring, pile foundation concrete placement accomplishes the back, in time clears up pile bolsters, and whether inspection pile foundation sounding pipe is unobstructed, treats that pile foundation concrete reaches the health preserving period after, carries out ultrasonic detection.
2. The rock-socketed pile construction method of the deep-buried hard rock stratum XG360 rotary drilling rig according to claim 1, characterized in that: in the second step, for engineering geology with geological hardness less than 5Mpa, soil indexes such as hydrogeological structure parameters and the like are acquired during analysis; for lithology, the cause and type of rock, the size and shape of rock particles, rock structure and fracture development, the nature of cementation and the form of cementation are known.
3. The rock-socketed pile construction method of the deep-buried hard rock stratum XG360 rotary drilling rig according to claim 1, characterized in that: in the fifth step, the mixture ratio of water, bentonite, CNC (sodium cellulose) and lignin group decomposer alkali (Na2CO3) is as follows: 100:6:0.8:3.
4. The rock-socketed pile construction method of the deep-buried hard rock stratum XG360 rotary drilling rig according to claim 1, characterized in that: and the bucket teeth of the seven-medium-short spiral drill bit in the step adopt bullet heads with tungsten-cobalt hard alloy inlaid at the heads, and the bucket teeth adopt tooth teeth to drill and take slag.
5. The rock-socketed pile construction method of the deep-buried hard rock stratum XG360 rotary drilling rig according to claim 1, characterized in that: and step nine, pouring the underwater concrete by adopting a vertical lifting guide pipe method, performing pre-assembly and water filling tests on the guide pipe before the guide pipe is used, wherein the pressure during the water filling test is not less than 1.5 times of the maximum pressure possibly borne by the guide pipe wall during pouring the concrete.
6. The rock-socketed pile construction method of the deep-buried hard rock stratum XG360 rotary drilling rig according to claim 1, characterized in that: and step nine, the steel reinforcement cage is lengthened by adopting a straight thread sleeve to be connected, the steel reinforcement cage sinks after being lengthened section by section, and the steel reinforcement cage is fixed by welding steel oxcles on the inner wall of the steel casing after being sunk to the designed elevation, so that the steel reinforcement cage is prevented from deviating or floating in the concrete pouring process.
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| CN106245626A (en) * | 2016-08-15 | 2016-12-21 | 中建三局基础设施工程有限公司 | A kind of hard formation churning driven enters method |
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Application publication date: 20210625 |