CN110685603A - Offshore large-diameter steel pipe rock-socketed pile construction platform and construction method - Google Patents
Offshore large-diameter steel pipe rock-socketed pile construction platform and construction method Download PDFInfo
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- CN110685603A CN110685603A CN201910875856.6A CN201910875856A CN110685603A CN 110685603 A CN110685603 A CN 110685603A CN 201910875856 A CN201910875856 A CN 201910875856A CN 110685603 A CN110685603 A CN 110685603A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 90
- 239000010959 steel Substances 0.000 title claims abstract description 90
- 238000010276 construction Methods 0.000 title claims abstract description 72
- 238000005553 drilling Methods 0.000 claims abstract description 82
- 239000011435 rock Substances 0.000 claims description 64
- 239000002689 soil Substances 0.000 claims description 36
- 238000000034 method Methods 0.000 claims description 25
- 238000007599 discharging Methods 0.000 claims description 19
- 230000008569 process Effects 0.000 claims description 19
- 230000007246 mechanism Effects 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000005086 pumping Methods 0.000 claims description 8
- 230000009471 action Effects 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 6
- 238000007865 diluting Methods 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 239000002893 slag Substances 0.000 claims description 6
- 238000005096 rolling process Methods 0.000 claims description 4
- 238000007667 floating Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 9
- 239000000126 substance Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
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- 238000005265 energy consumption Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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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
- E21B7/12—Underwater drilling
- E21B7/136—Underwater drilling from non-buoyant support
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
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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
- E02D5/385—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with removal of the outer mould-pipes
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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
- E21B1/00—Percussion drilling
-
- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
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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
- E21B31/00—Fishing for or freeing objects in boreholes or wells
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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
- E21B7/002—Drilling with diversely driven shafts extending into the borehole
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B2017/0056—Platforms with supporting legs
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0023—Cast, i.e. in situ or in a mold or other formwork
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- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
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Abstract
The invention discloses an offshore large-diameter steel pipe socketed pile construction platform and a construction method thereof.A four positioning piles of the construction platform are fixed at four corners of the bottom surface of a fixed platform, a rotary platform is movably connected to the fixed platform to enable the rotary platform to rotate for a certain angle and be locked relative to the fixed platform, pile casings are arranged in central through holes of the fixed platform and the rotary platform, a plurality of pile driving frames are fixed on the top surface of the rotary platform at intervals along the circumferential direction, the top ends of guide pipes are fixed at the bottom side of a guide pipe mounting plate extending from the top ends of the pile driving frames towards the center of the rotary platform, and down-the-hole hammers are; during construction, the down-the-hole hammer is started to form a plurality of rock-socketed round holes after the guide pipe and the down-the-hole hammer are kept in a vertically downward-placed state, then the down-the-hole hammer is started again to form a plurality of rock-socketed round holes by rotating the rotary platform for a certain angle, and finally an annular drilling hole is formed by adopting a mode of drilling one hole at a time; the construction platform and the construction method are convenient to operate, are not influenced by wind and waves, can greatly increase the operation time, and improve the construction efficiency and the construction precision.
Description
Technical Field
The invention relates to the technical field of underground operation of oil and gas fields, in particular to an offshore large-diameter steel pipe socketed pile construction platform and a construction method.
Background
In a pile foundation structure, the rock-socketed pile has the advantages of high bearing capacity and small settlement, the rock-socketed pile is widely applied to the fields of highways, bridges, ports, wind power and the like and gradually develops to a large-diameter rock-socketed pile, and for hard rock drilling, the down-the-hole hammer is effective drilling equipment, is rapidly developed in recent years, and the application field is continuously widened. The existing rock-socketed pile construction needs to carry out full-section crushing on a drilled hole, for the large-diameter hard rock drilling, the crushed rock area is increased along with the square value of the hole diameter, and the full-section drilling inevitably increases the crushed rock energy of a down-the-hole hammer, so that the power equipment is huge, the power consumption is high, the drilling cost is increased, the annular section drilling can greatly reduce the crushed rock area, the energy consumption is saved, and the efficiency is improved.
The applicant applies for a construction method and equipment (application number: 201810988442.X) of an annular drilling socketed pile in 2018, 8, 28.A construction method comprises the steps of sequentially driving a steel casing, drilling a plurality of annular down-the-hole hammers which are continuously distributed along the circumferential direction to form a drilling hole with an annular section, driving a steel pipe pile along the inner wall of the steel casing, pouring concrete layers into inner and outer side gaps between the steel pipe pile and the drilling hole with the annular section, and pulling out the steel casing in the pouring process; the equipment comprises a steel truss, an annular chassis, a plurality of drill rods and a plurality of down-the-hole hammers, wherein the steel truss, the annular chassis, the drill rods are vertically arranged below the annular chassis along the circumferential direction, and the down-the-hole hammers are arranged at the bottom ends of the drill rods in a one-to-one correspondence manner; the adjacent down-the-hole hammers are arranged up and down in a staggered way, and the projection parts of the drill bits on the same horizontal plane are overlapped; the construction method and the corresponding equipment adopt the down-the-hole hammer to drill the hole to form the annular section of the implantable rock-socketed pile, reduce the construction cost of the large-diameter rock-socketed pile, have high drilling efficiency and good hole forming quality, and particularly improve the drilling efficiency of hard rock strata.
Disclosure of Invention
The invention aims to provide a construction platform for a marine large-diameter steel pipe rock-socketed pile, which solves the problems that the construction efficiency of the marine large-diameter steel pipe rock-socketed pile is low, the ship-machine configuration requirement is high and the like at present.
The invention also aims to provide a construction method realized by adopting the offshore large-diameter steel pipe socketed pile construction platform.
Therefore, the technical scheme of the invention is as follows:
a construction platform for an offshore large-diameter steel pipe socketed pile comprises four positioning piles, a fixed platform, a rotary platform, a plurality of pile driving frames, a pile casing, a plurality of guide pipes and a plurality of down-the-hole hammers, wherein the four positioning piles, the fixed platform, the rotary platform and the plurality of pile driving frames are sequentially arranged from bottom to top; the top ends of the four positioning piles are respectively fixed at four top corners of the bottom surface of the fixed platform; the rotating platform is arranged on the fixed platform and is movably connected with the fixed platform, so that the rotating platform can rotate for a certain angle relative to the fixed platform and is fixed at the rotated position through a locking mechanism; axial through holes are formed in the centers of the fixed platform and the rotating platform, so that the pile casing is arranged in the axial through holes of the fixed platform; a plurality of pile driving frames are fixed on the top surface of the rotating platform at intervals along the circumferential direction, the top end of each pile driving frame extends towards the center of the rotating platform to form a guide pipe mounting plate, and the number of the guide pipes and the number of the down-the-hole hammers are the same as that of the pile driving frames; the guide pipes are vertically arranged, and the top ends of the guide pipes are respectively fixed on the bottom surface of the guide pipe mounting plate of each pile driving frame one by one; the down-the-hole hammers are respectively fixed at the bottom end of each guide pipe one by one.
Furthermore, the fixed platform is movably connected with the rotating platform through a turntable bearing; the turntable bearing comprises an outer ring fixed on the top surface of the fixed platform and an inner ring fixed on the bottom surface of the rotary platform, and a rolling element group is arranged in an annular space between the inner ring and the outer ring, so that the rotary platform can freely rotate relative to the fixed platform.
Furthermore, the locking mechanism comprises a plurality of locking pin shafts, the locking pin shafts are arranged on the rotating platform along the circumferential direction through movable chains, a plurality of pin holes close to the edges are respectively arranged on the fixed platform and the rotating platform correspondingly one by one along the circumferential direction, after the rotating platform rotates for a certain angle relative to the fixed platform, the locking pin shafts are respectively inserted into two through holes, and the relative position change of the fixed platform and the rotating platform is realized.
A construction method for realizing an offshore large-diameter steel pipe socketed pile construction platform comprises the following steps:
s1, driving four positioning piles in a construction area, and fixing a fixed platform at the top ends of the four positioning piles;
s2, hoisting the pile casing above the fixed platform by using hoisting equipment, penetrating the pile casing through a central through hole of the fixed platform, and then driving the pile casing to the bottom of the pile casing to reach the top surface of the rock stratum by using a hoisting pile hammer;
s3, discharging the soil layer in the pile casing by adopting a grab bucket or a rotary drilling rig, or discharging soil by using a mud pump after diluting the soil layer in the pile casing by adopting a high-pressure water filling method until the soil in the soil layer above the rock stratum is completely discharged;
s4, mounting a rotating platform on the fixed platform and fixing the rotating platform relative to the fixed platform through a locking device; uniformly distributing a plurality of pile driving frames on the rotary platform along the circumferential direction, respectively fixing down-the-hole hammers at the bottom ends of each guide pipe to be connected, and fixing the top ends of the guide pipes on a guide pipe mounting plate of the pile driving frames;
s5, placing down-the-hole hammer along the inner wall of the pile casing, keeping the guide pipe and the down-the-hole hammer in a vertically placed state, and starting the down-the-hole hammer to drill the rock stratum to the designed elevation of the pile bottom to form a plurality of rock-socketed round holes;
s6, fixing the rotary platform at the position through a locking device after rotating for a certain angle, starting a down-the-hole hammer to drill the rock stratum to the designed elevation of the pile bottom, and forming a plurality of rock-socketed round holes again; the down-the-hole hammer adopts a mode of drilling at intervals in the drilling process, namely, a plurality of rock-socketed round holes formed in a rock stratum by each time of drilling and a plurality of rock-socketed round holes formed in the rock stratum by the previous time of drilling are not overlapped with each other; meanwhile, hole cleaning and slag discharging are carried out simultaneously in each drilling process;
s7, repeating the step S6 until all rock-socketed round holes formed by the rock stratum through multiple times of impact drilling are communicated with each other to form an annular drilling hole;
s8, after all down-the-hole hammers, the guide pipe and the pile driving frame are lifted away, the large-diameter steel pipe pile is lowered to the designed elevation along the inner wall of the pile casing, and the steel pipe pile is embedded into the annular drill hole;
s9, pouring concrete into an inner annular space and an outer annular space formed after the large-diameter steel pipe pile is inserted into the annular drill hole of the rock stratum until the top surface of the concrete is flush with the rock stratum, and pouring concrete into the annular space formed between the large-diameter steel pipe pile and the pile casing until the top surface of the concrete is flush with the top surface of the soil layer, so that the large-diameter steel pipe pile is organically combined with the hole bottom and the hole wall;
and S10, in the process of the step S8, the pile casing is pulled out before the initial setting of the concrete or when the concrete is poured, the pile casing is pulled out, and the construction of the large-diameter steel pipe rock-socketed pile is completed.
In another embodiment of the present application, a box cylinder is further provided below each of the spuds, and the bottom end of the spud is fixed at the center of the box cylinder below the spud.
The construction method for realizing the offshore large-diameter steel pipe socketed pile construction platform comprises the following steps:
s1, respectively fixing four positioning piles at the centers of the top surfaces of the four box cylinders, fixing the four positioning piles at the top ends of the four positioning piles to form a combined platform structure, keeping the platform structure in a floating state in water in a lifting or slide launching mode, and dragging the platform structure to a construction area by using a tugboat;
s2, connecting the air pumping holes of the four box barrels with an air pump through air delivery pipes respectively, and synchronously pumping air in the box barrels at the same speed to enable the platform structure to sink into the mud surface under the action of self weight and then sink below the mud surface under the action of negative pressure until the platform structure is in a stable state;
s3, hoisting the pile casing above the fixed platform by using hoisting equipment, penetrating the pile casing through a central through hole of the fixed platform, and then driving the pile casing to the bottom of the pile casing to reach the top surface of the rock stratum by using a hoisting pile hammer;
s4, discharging the soil layer in the pile casing by adopting a grab bucket or a rotary drilling rig, or discharging soil by using a mud pump after diluting the soil layer in the pile casing by adopting a high-pressure water filling method until the soil in the soil layer above the rock stratum is completely discharged;
s5, mounting a rotating platform on the fixed platform and fixing the rotating platform relative to the fixed platform through a locking device; uniformly distributing a plurality of pile driving frames on the rotary platform along the circumferential direction, respectively fixing down-the-hole hammers at the bottom ends of each guide pipe to be connected, and fixing the top ends of the guide pipes on a guide pipe mounting plate of the pile driving frames;
s6, placing down-the-hole hammer along the inner wall of the pile casing, keeping the guide pipe and the down-the-hole hammer in a vertically placed state, and starting the down-the-hole hammer to drill the rock stratum to the designed elevation of the pile bottom to form a plurality of rock-socketed round holes;
s7, fixing the rotary platform at the position through a locking device after rotating for a certain angle, starting a down-the-hole hammer to drill the rock stratum to the designed elevation of the pile bottom, and forming a plurality of rock-socketed round holes again; the down-the-hole hammer adopts a mode of drilling at intervals in the drilling process, namely, a plurality of rock-socketed round holes formed in a rock stratum by each time of drilling and a plurality of rock-socketed round holes formed in the rock stratum by the previous time of drilling are not overlapped with each other; meanwhile, hole cleaning and slag discharging are carried out simultaneously in each drilling process;
s8, repeating the step S6 until all rock-socketed round holes formed by the rock stratum through multiple times of impact drilling are communicated with each other to form an annular drilling hole;
s9, after all down-the-hole hammers, the guide pipe and the pile driving frame are lifted away, the large-diameter steel pipe pile is lowered to the designed elevation along the inner wall of the pile casing, and the steel pipe pile is embedded into the annular drill hole;
s10, pouring concrete into an inner annular space and an outer annular space formed after the large-diameter steel pipe pile is inserted into the annular drill hole of the rock stratum until the top surface of the concrete is flush with the rock stratum, and pouring concrete into the annular space formed between the large-diameter steel pipe pile and the pile casing until the top surface of the concrete is flush with the top surface of the soil layer, so that the large-diameter steel pipe pile is organically combined with the hole bottom and the hole wall;
and S11, in the process of the step S8, the pile casing is pulled out before the initial setting of the concrete or when the concrete is poured, the pile casing is pulled out, and the construction of the large-diameter steel pipe rock-socketed pile is completed.
Further, after the large-diameter steel pipe pile is inserted into the annular drilling hole of the rock stratum, the distance between the annular space formed between the outer wall of the large-diameter steel pipe pile and the annular drilling hole is not smaller than 20mm, and the distance between the annular space formed between the inner wall of the large-diameter steel pipe pile and the annular drilling hole is not smaller than 20 mm.
Compared with the prior art, this marine major diameter steel pipe socketed pile construction platform simple structure, corresponding construction method convenient operation, construction operation is not influenced by the stormy waves on the platform, can greatly increase the activity duration, improves the efficiency of construction, through installing a plurality of drilling machines on the platform after having under construction a plurality of socketed round hole, can construct a plurality of socketed round hole on next step with a rotary platform rotation angle, has reduced the equipment demand, has improved the installation accuracy.
Drawings
FIG. 1 is a schematic structural diagram of an offshore large-diameter steel pipe socketed pile construction platform;
FIG. 2 is a disassembly schematic view of the offshore large-diameter steel pipe socketed pile construction platform;
FIG. 3 is a top view of the offshore large-diameter steel pipe socketed pile construction platform of the invention;
FIG. 4(a) is a schematic diagram of the offshore large-diameter steel pipe socketed pile construction platform after the platform is subjected to primary rotary drilling;
FIG. 4(b) is a schematic diagram of the offshore large-diameter steel pipe socketed pile construction platform after the second rotary drilling;
FIG. 5(a) is a schematic diagram of an offshore large-diameter steel pipe socketed pile construction platform in the initial drilling stage;
FIG. 5(b) is a schematic diagram of the completion of the circular drilling of the stroke by the drilling of the offshore large-diameter steel pipe socketed pile construction platform
FIG. 5(c) is a schematic diagram of pile sinking by using the offshore large-diameter steel pipe socketed pile construction platform of the invention
FIG. 6 is a schematic diagram of the offshore large-diameter steel pipe socketed pile construction platform for drilling holes;
FIG. 7 is a schematic diagram of the construction platform for the offshore large-diameter steel pipe socketed pile for pile forming;
FIG. 8 is a schematic structural diagram of the offshore large-diameter steel pipe socketed pile construction platform provided with the box barrel.
In the figure: 1. positioning the pile; 2. a fixed platform; 3. rotating the platform; 4. a pile driving frame; 5. protecting the cylinder; 6. a conduit; 7. a down-the-hole hammer; 8. a rock-socketed round hole; 9. annular drilling; 10. large-diameter steel pipe piles; 11. concrete; 12. a case; 13. and a tank air exhaust hole.
Detailed Description
The invention will be further described with reference to the following figures and specific examples, which are not intended to limit the invention in any way.
Example 1
As shown in fig. 1-2, the offshore large-diameter steel pipe socketed pile construction platform comprises four positioning piles 1, a fixed platform 2, a rotary platform 3, four pile driving frames 4, a pile casing 5, four guide pipes 6 and four down-the-hole hammers 7, wherein the four positioning piles 1, the fixed platform 2, the rotary platform 3 and the four pile driving frames 4 are sequentially arranged from bottom to top; wherein the content of the first and second substances,
the top ends of the four positioning piles 1 are respectively fixed at four top corners of the bottom surface of the fixed platform 2;
the fixed platform 2 and the rotating platform 3 are movably connected through a turntable bearing; the turntable bearing comprises an outer ring fixed on the top surface of the fixed platform 2 and an inner ring fixed on the bottom surface of the rotary platform 3, and a rolling element group is arranged in an annular space between the inner ring and the outer ring, so that the rotary platform 3 can freely rotate relative to the fixed platform 2;
the locking mechanism comprises 5 locking pin shafts, the locking pin shafts are arranged on the rotary platform 3 along the circumferential direction through movable chains, 18 pin holes close to the edges are correspondingly arranged on the fixed platform 2 and the rotary platform 3 along the circumferential direction respectively in a one-to-one correspondence mode, so that the rotary platform 3 rotates for a certain angle relative to the fixed platform 2, after 20 degrees, the locking pin shafts are respectively inserted into two vertically through hole pairs, and the rotary platform 3 can rotate for a certain angle around the circular shape of the fixed platform 2 and is fixed at the rotated position through the locking mechanism;
axial through holes are formed in the centers of the fixed platform 2 and the rotating platform 3, so that the pile casing 5 is arranged in the axial through holes of the fixed platform 2; the four pile driving frames 4 are fixed on the top surface of the rotating platform 3 at intervals along the circumferential direction, the top end of each pile driving frame 4 extends towards the center of the rotating platform 3 to form a guide pipe mounting plate 401, so that the four guide pipes 6 are vertically arranged, and the top ends of the four guide pipes are respectively fixed on the bottom surface of the guide pipe mounting plate 401 of each pile driving frame 4 one by one; the four down-the-hole hammers 7 are respectively fixed at the bottom end of each guide pipe 6 one by one.
The construction method realized by adopting the offshore large-diameter steel pipe socketed pile construction platform comprises the following steps:
s1, driving four positioning piles in a construction area, and fixing a fixed platform at the top ends of the four positioning piles;
s2, hoisting the pile casing above the fixed platform by using hoisting equipment, penetrating the pile casing through a central through hole of the fixed platform, and then driving the pile casing to the bottom of the pile casing to reach the top surface of the rock stratum by using a hoisting pile hammer;
s3, discharging the soil layer in the pile casing by adopting a grab bucket or a rotary drilling rig, or discharging soil by using a mud pump after diluting the soil layer in the pile casing by adopting a high-pressure water filling method until the soil in the soil layer above the rock stratum is completely discharged;
s4, mounting a rotating platform on the fixed platform and fixing the rotating platform relative to the fixed platform through a locking device; uniformly distributing a plurality of pile driving frames on the rotary platform along the circumferential direction, respectively fixing down-the-hole hammers at the bottom ends of each guide pipe to be connected, and fixing the top ends of the guide pipes on a guide pipe mounting plate of the pile driving frames;
s5, as shown in figure 6, placing a down-the-hole hammer down along the inner wall of the casing, keeping the guide pipe and the down-the-hole hammer in a vertically placed state, starting the down-the-hole hammer to drill the rock stratum to the designed elevation of the pile bottom, and forming a plurality of rock-socketed round holes as shown in figure 4 (a);
s6, fixing the rotary platform at the position through a locking device after rotating for a certain angle, starting a down-the-hole hammer to drill the rock stratum to the designed elevation of the pile bottom, and forming a plurality of rock-socketed round holes again; wherein, the drilling process of the down-the-hole hammer adopts a mode of drilling at intervals, namely, as shown in figure 4(b), a plurality of rock-socketed round holes formed by drilling the rock stratum at each time are not overlapped with a plurality of rock-socketed round holes formed by drilling the rock stratum at the previous time; meanwhile, hole cleaning and slag discharging are carried out simultaneously in each drilling process;
s7, repeating the step S6 until all the rock-socketed round holes formed by the rock stratum through multiple times of impact drilling penetrate through each other to form an annular drilling hole, as shown in the figure 5(a) and the figure 5 (b);
s8, after all down-the-hole hammers, the guide pipe and the pile driving frame are lifted away, the large-diameter steel pipe pile is lowered to the designed elevation along the inner wall of the pile casing, and the steel pipe pile is embedded into the annular drill hole;
after the large-diameter steel pipe pile is inserted into an annular drilling hole of a rock stratum, the distance between an annular space formed between the outer wall of the large-diameter steel pipe pile and the annular drilling hole is 20mm, and the distance between an annular space formed between the inner wall of the large-diameter steel pipe pile and the annular drilling hole is 20 mm;
s9, as shown in figure 7, pouring concrete into an inner annular space and an outer annular space formed after the large-diameter steel pipe pile is inserted into the annular drill hole of the rock stratum until the top surface of the concrete is flush with the rock stratum, and pouring concrete into an annular space formed between the large-diameter steel pipe pile and the casing until the top surface of the concrete is flush with the top surface of the soil layer, so that the large-diameter steel pipe pile is organically combined with the hole bottom and the hole wall;
s10, in the process of the step S9, the pile casing is pulled out before the initial setting of the concrete or when the concrete is poured, the pile casing is pulled out, then the pile casing is moved away, the temporary platform is dismantled to the next pile position, and the construction of the large-diameter steel pipe rock-socketed pile is completed.
Example 2
As shown in fig. 8, the offshore large-diameter steel pipe socketed pile construction platform comprises four box barrels 12, four positioning piles 1, a fixed platform 2, a rotary platform 3 and a plurality of pile driving frames 4 which are arranged from bottom to top in sequence, a pile casing 5, four guide pipes 6 arranged on the inner side of the pile casing 5 and four down-the-hole hammers 7; wherein the content of the first and second substances,
the top ends of the four positioning piles 1 are respectively fixed at four top corners of the bottom surface of the fixed platform 2, and the top ends of the four positioning piles 1 are respectively fixed at the centers of the top surfaces of the four box cylinders 12; each box barrel 12 is provided with the same air pumping hole 13 which is connected with an air pump through an air transmission pipeline and used for pumping air and discharging air through the air pump;
the rotating platform 3 is arranged on the fixed platform 2 and is movably connected with the fixed platform 2, so that the rotating platform 3 can rotate for a certain angle around the circle of the fixed platform 2 and is fixed at the rotated position through a locking mechanism; axial through holes are formed in the centers of the fixed platform 2 and the rotating platform 3, so that the pile casing 5 is arranged in the axial through holes of the fixed platform 2; four pile driving frames 4 are fixed on the top surface of the rotating platform 3 at intervals along the circumferential direction, and the top end of each pile driving frame 4 extends towards the center of the rotating platform 3 to form a conduit mounting plate 401; the four guide pipes 6 are vertically arranged, and the top ends of the four guide pipes are respectively fixed on the bottom surface of the guide pipe mounting plate 401 of each pile driving frame 4 one by one; the four down-the-hole hammers 7 are respectively fixed at the bottom end of each guide pipe 6 one by one.
The fixed platform 2 and the rotating platform 3 are movably connected through a turntable bearing; the turntable bearing comprises an outer ring fixed on the top surface of the fixed platform 2 and an inner ring fixed on the bottom surface of the rotary platform 3, and a rolling element group is arranged in an annular space between the inner ring and the outer ring, so that the rotary platform 3 can freely rotate relative to the fixed platform 2.
The locking mechanism comprises 5 locking pin shafts, the locking pin shafts are arranged on the rotary platform 3 along the circumferential direction through movable chains, 18 pin holes close to the edges are correspondingly arranged on the fixed platform 2 and the rotary platform 3 along the circumferential direction respectively in a one-to-one correspondence mode, after the rotary platform 3 rotates for a certain angle (20 degrees and multiples of 20 degrees) relative to the fixed platform 2, the locking pin shafts are respectively inserted into two through hole stators which are communicated up and down, so that the rotary platform 3 can rotate for a certain angle around the circle of the fixed platform 2 and is fixed at the rotated position through the locking mechanism;
the construction method realized by adopting the offshore large-diameter steel pipe socketed pile construction platform comprises the following steps:
s1, respectively fixing four positioning piles at the centers of the top surfaces of the four box cylinders, fixing the four positioning piles at the top ends of the four positioning piles to form a combined platform structure, keeping the platform structure in a floating state in water in a lifting or slide launching mode, and dragging the platform structure to a construction area by using a tugboat;
s2, connecting the air pumping holes of the four box barrels with an air pump through air delivery pipes respectively, and synchronously pumping air in the box barrels at the same speed to enable the platform structure to sink into the mud surface under the action of self weight and then sink below the mud surface under the action of negative pressure until the platform structure is in a stable state;
s3, hoisting the pile casing above the fixed platform by using hoisting equipment, penetrating the pile casing through a central through hole of the fixed platform, and then driving the pile casing to the bottom of the pile casing to reach the top surface of the rock stratum by using a hoisting pile hammer;
s4, discharging the soil layer in the pile casing by adopting a grab bucket or a rotary drilling rig, or discharging soil by using a mud pump after diluting the soil layer in the pile casing by adopting a high-pressure water filling method until the soil in the soil layer above the rock stratum is completely discharged;
s5, mounting a rotating platform on the fixed platform and fixing the rotating platform relative to the fixed platform through a locking device; uniformly distributing a plurality of pile driving frames on the rotary platform along the circumferential direction, respectively fixing down-the-hole hammers at the bottom ends of each guide pipe to be connected, and fixing the top ends of the guide pipes on a guide pipe mounting plate of the pile driving frames;
s6, placing down-the-hole hammer along the inner wall of the pile casing, keeping the guide pipe and the down-the-hole hammer in a vertically placed state, and starting the down-the-hole hammer to drill the rock stratum to the designed elevation of the pile bottom to form a plurality of rock-socketed round holes;
s7, fixing the rotary platform at the position through a locking device after rotating for a certain angle, starting a down-the-hole hammer to drill the rock stratum to the designed elevation of the pile bottom, and forming a plurality of rock-socketed round holes again; the down-the-hole hammer adopts a mode of drilling at intervals in the drilling process, namely, a plurality of rock-socketed round holes formed in a rock stratum by each time of drilling and a plurality of rock-socketed round holes formed in the rock stratum by the previous time of drilling are not overlapped with each other; meanwhile, hole cleaning and slag discharging are carried out simultaneously in each drilling process;
s8, repeating the step S6 until all rock-socketed round holes formed by the rock stratum through multiple times of impact drilling are communicated with each other to form an annular drilling hole;
s9, after all down-the-hole hammers, the guide pipe and the pile driving frame are lifted away, the large-diameter steel pipe pile is lowered to the designed elevation along the inner wall of the pile casing, and the steel pipe pile is embedded into the annular drill hole;
after the large-diameter steel pipe pile is inserted into an annular drilling hole of a rock stratum, the distance between an annular space formed between the outer wall of the large-diameter steel pipe pile and the annular drilling hole is 25mm, and the distance between an annular space formed between the inner wall of the large-diameter steel pipe pile and the annular drilling hole is 25 mm;
s10, pouring concrete into an inner annular space and an outer annular space formed after the large-diameter steel pipe pile is inserted into the annular drill hole of the rock stratum until the top surface of the concrete is flush with the rock stratum, and pouring concrete into the annular space formed between the large-diameter steel pipe pile and the pile casing until the top surface of the concrete is flush with the top surface of the soil layer, so that the large-diameter steel pipe pile is organically combined with the hole bottom and the hole wall;
s11, in the process of the step S10, the pile casing is pulled out before the initial setting of the concrete or when the concrete is poured at the same time; and then, inflating the air pump into the box cylinder to enable the platform structure to float upwards under the action of buoyancy until the platform structure reaches a stable state, and dragging the platform structure to the next pile position by adopting a dragging wheel to complete the construction of one large-diameter steel pipe rock-socketed pile and the construction of one large-diameter steel pipe rock-socketed pile.
Claims (7)
1. A construction platform for an offshore large-diameter steel pipe socketed pile is characterized by comprising four positioning piles (1), a fixed platform (2), a rotary platform (3), a plurality of pile driving frames (4), a pile casing (5), a plurality of guide pipes (6) and a plurality of down-the-hole hammers (7), wherein the positioning piles, the fixed platform (2), the rotary platform and the pile driving frames are sequentially arranged from bottom to top; the top ends of the four positioning piles (1) are respectively fixed at four top corners of the bottom surface of the fixed platform (2); the rotating platform (3) is arranged on the fixed platform (2) and is movably connected with the fixed platform (2), so that the rotating platform (3) can rotate for a certain angle relative to the fixed platform (2) and is fixed at the rotated position through a locking mechanism; axial through holes are formed in the centers of the fixed platform (2) and the rotating platform (3), so that the pile casing (5) is arranged in the axial through holes of the fixed platform (2); a plurality of pile driving frames (4) are fixed on the top surface of the rotating platform (3) at intervals along the circumferential direction, and the top end of each pile driving frame (4) extends towards the center of the rotating platform (3) to form a conduit mounting plate (401); the number of the guide pipes (6) and the number of the down-the-hole hammers (7) are the same as that of the pile driving frames (4); the guide pipes (6) are vertically arranged, and the top ends of the guide pipes are respectively fixed on the bottom surface of the guide pipe mounting plate (401) of each pile driving frame (4) one by one; the down-the-hole hammers (7) are respectively fixed at the bottom end of each guide pipe (6).
2. An offshore large-diameter steel pipe socketed pile construction platform as claimed in claim 1, characterized in that a box cylinder (12) is further arranged below each spud (1), and the bottom end of the spud (1) is fixed at the center of the box cylinder (12) below the spud.
3. The offshore large-diameter steel pipe socketed pile construction platform of claim 1, characterized in that the fixed platform (2) and the rotating platform (3) are movably connected through a turntable bearing; the turntable bearing comprises an outer ring fixed on the top surface of the fixed platform (2) and an inner ring fixed on the bottom surface of the rotary platform (3), and a rolling element group is arranged in an annular space between the inner ring and the outer ring, so that the rotary platform (3) can freely rotate relative to the fixed platform (2).
4. The offshore large-diameter steel pipe socketed pile construction platform of claim 1, wherein the locking mechanism comprises a plurality of locking pins, the locking pins are arranged on the rotating platform (3) along a circumferential direction through a movable chain, a plurality of pin holes adjacent to the edges are respectively arranged on the fixed platform (2) and the rotating platform (3) along the circumferential direction in a one-to-one correspondence manner, and after the rotating platform (3) rotates a certain angle relative to the fixed platform (2), the locking pins are respectively inserted into two through-hole retainers which are vertically communicated, so that the relative position of the fixed platform (2) and the rotating platform (3) can be changed.
5. A construction method based on the offshore large-diameter steel pipe socketed pile construction platform as claimed in claim 1, characterized by comprising the following steps:
s1, driving four positioning piles in a construction area, and fixing a fixed platform at the top ends of the four positioning piles;
s2, hoisting the pile casing above the fixed platform by using hoisting equipment, penetrating the pile casing through a central through hole of the fixed platform, and then driving the pile casing to the bottom of the pile casing to reach the top surface of the rock stratum by using a hoisting pile hammer;
s3, discharging the soil layer in the pile casing by adopting a grab bucket or a rotary drilling rig, or discharging soil by using a mud pump after diluting the soil layer in the pile casing by adopting a high-pressure water filling method until the soil in the soil layer above the rock stratum is completely discharged;
s4, mounting a rotating platform on the fixed platform and fixing the rotating platform relative to the fixed platform through a locking device; uniformly distributing a plurality of pile driving frames on the rotary platform along the circumferential direction, respectively fixing down-the-hole hammers at the bottom ends of each guide pipe to be connected, and fixing the top ends of the guide pipes on a guide pipe mounting plate of the pile driving frames;
s5, placing down-the-hole hammer along the inner wall of the pile casing, keeping the guide pipe and the down-the-hole hammer in a vertically placed state, and starting the down-the-hole hammer to drill the rock stratum to the designed elevation of the pile bottom to form a plurality of rock-socketed round holes;
s6, fixing the rotary platform at the position through a locking device after rotating for a certain angle, starting a down-the-hole hammer to drill the rock stratum to the designed elevation of the pile bottom, and forming a plurality of rock-socketed round holes again; the down-the-hole hammer adopts a mode of drilling at intervals in the drilling process, namely, a plurality of rock-socketed round holes formed in a rock stratum by each time of drilling and a plurality of rock-socketed round holes formed in the rock stratum by the previous time of drilling are not overlapped with each other; meanwhile, hole cleaning and slag discharging are carried out simultaneously in each drilling process;
s7, repeating the step S6 until all rock-socketed round holes formed by the rock stratum through multiple times of impact drilling are communicated with each other to form an annular drilling hole;
s8, after all down-the-hole hammers, the guide pipe and the pile driving frame are lifted away, the large-diameter steel pipe pile is lowered to the designed elevation along the inner wall of the pile casing, and the steel pipe pile is embedded into the annular drill hole;
s9, pouring concrete into an inner annular space and an outer annular space formed after the large-diameter steel pipe pile is inserted into the annular drill hole of the rock stratum until the top surface of the concrete is flush with the rock stratum, and pouring concrete into the annular space formed between the large-diameter steel pipe pile and the pile casing until the top surface of the concrete is flush with the top surface of the soil layer, so that the large-diameter steel pipe pile is organically combined with the hole bottom and the hole wall;
and S10, in the process of the step S8, the pile casing is pulled out before the initial setting of the concrete or when the concrete is poured, the pile casing is pulled out, and the construction of the large-diameter steel pipe rock-socketed pile is completed.
6. A construction method based on the offshore large-diameter steel pipe socketed pile construction platform as claimed in claim 2, characterized by comprising the following steps:
s1, respectively fixing four positioning piles at the centers of the top surfaces of the four box cylinders, fixing the four positioning piles at the top ends of the four positioning piles to form a combined platform structure, keeping the platform structure in a floating state in water in a lifting or slide launching mode, and dragging the platform structure to a construction area by using a tugboat;
s2, connecting the air pumping holes of the four box barrels with an air pump through air delivery pipes respectively, and synchronously pumping air in the box barrels at the same speed to enable the platform structure to sink into the mud surface under the action of self weight and then sink below the mud surface under the action of negative pressure until the platform structure is in a stable state;
s3, hoisting the pile casing above the fixed platform by using hoisting equipment, penetrating the pile casing through a central through hole of the fixed platform, and then driving the pile casing to the bottom of the pile casing to reach the top surface of the rock stratum by using a hoisting pile hammer;
s4, discharging the soil layer in the pile casing by adopting a grab bucket or a rotary drilling rig, or discharging soil by using a mud pump after diluting the soil layer in the pile casing by adopting a high-pressure water filling method until the soil in the soil layer above the rock stratum is completely discharged;
s5, mounting a rotating platform on the fixed platform and fixing the rotating platform relative to the fixed platform through a locking device; uniformly distributing a plurality of pile driving frames on the rotary platform along the circumferential direction, respectively fixing down-the-hole hammers at the bottom ends of each guide pipe to be connected, and fixing the top ends of the guide pipes on a guide pipe mounting plate of the pile driving frames;
s6, placing down-the-hole hammer along the inner wall of the pile casing, keeping the guide pipe and the down-the-hole hammer in a vertically placed state, and starting the down-the-hole hammer to drill the rock stratum to the designed elevation of the pile bottom to form a plurality of rock-socketed round holes;
s7, fixing the rotary platform at the position through a locking device after rotating for a certain angle, starting a down-the-hole hammer to drill the rock stratum to the designed elevation of the pile bottom, and forming a plurality of rock-socketed round holes again; the down-the-hole hammer adopts a mode of drilling at intervals in the drilling process, namely, a plurality of rock-socketed round holes formed in a rock stratum by each time of drilling and a plurality of rock-socketed round holes formed in the rock stratum by the previous time of drilling are not overlapped with each other; meanwhile, hole cleaning and slag discharging are carried out simultaneously in each drilling process;
s8, repeating the step S6 until all rock-socketed round holes formed by the rock stratum through multiple times of impact drilling are communicated with each other to form an annular drilling hole;
s9, after all down-the-hole hammers, the guide pipe and the pile driving frame are lifted away, the large-diameter steel pipe pile is lowered to the designed elevation along the inner wall of the pile casing, and the steel pipe pile is embedded into the annular drill hole;
s10, pouring concrete into an inner annular space and an outer annular space formed after the large-diameter steel pipe pile is inserted into the annular drill hole of the rock stratum until the top surface of the concrete is flush with the rock stratum, and pouring concrete into the annular space formed between the large-diameter steel pipe pile and the pile casing until the top surface of the concrete is flush with the top surface of the soil layer, so that the large-diameter steel pipe pile is organically combined with the hole bottom and the hole wall;
and S11, in the process of the step S8, the pile casing is pulled out before the initial setting of the concrete or when the concrete is poured, the pile casing is pulled out, and the construction of the large-diameter steel pipe rock-socketed pile is completed.
7. The offshore large-diameter steel pipe socketed pile construction platform of claim 5 or 6, wherein the annular bore hole has a size that satisfies: after the large-diameter steel pipe pile is inserted into the annular drilling hole of the rock stratum, the distance between the annular space formed between the outer wall of the large-diameter steel pipe pile and the annular drilling hole is not less than 20mm, and the distance between the annular space formed between the inner wall of the large-diameter steel pipe pile and the annular drilling hole is not less than 20 mm.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111707151A (en) * | 2020-06-11 | 2020-09-25 | 武汉大学 | One-time blasting excavation forming method for offshore rock-socketed pile foundation |
| CN112411529A (en) * | 2020-11-16 | 2021-02-26 | 山西机械化建设集团有限公司 | Rock-entering pore-forming method of hard bedrock socketed pile small-diameter down-the-hole hammer auxiliary rotary drilling rig |
| CN113431488A (en) * | 2021-08-09 | 2021-09-24 | 中地君豪高科股份有限公司 | Equipment for constructing square hole in hard stratum |
| CN114319988A (en) * | 2022-02-10 | 2022-04-12 | 上海市城市建设设计研究总院（集团）有限公司 | Rotating type traffic sign portal frame and construction method |
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2019
- 2019-09-17 CN CN201910875856.6A patent/CN110685603A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111707151A (en) * | 2020-06-11 | 2020-09-25 | 武汉大学 | One-time blasting excavation forming method for offshore rock-socketed pile foundation |
| CN112411529A (en) * | 2020-11-16 | 2021-02-26 | 山西机械化建设集团有限公司 | Rock-entering pore-forming method of hard bedrock socketed pile small-diameter down-the-hole hammer auxiliary rotary drilling rig |
| CN113431488A (en) * | 2021-08-09 | 2021-09-24 | 中地君豪高科股份有限公司 | Equipment for constructing square hole in hard stratum |
| CN113431488B (en) * | 2021-08-09 | 2024-05-10 | 广州君豪岩土工程有限公司 | Equipment for constructing square holes in hard stratum |
| CN114319988A (en) * | 2022-02-10 | 2022-04-12 | 上海市城市建设设计研究总院（集团）有限公司 | Rotating type traffic sign portal frame and construction method |
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