A kind of construction technology of the embedding rock single pile of offshore wind power foundation embedded type
Technical field
The present invention relates to a kind of construction technologies of the embedding rock single pile of offshore wind power foundation embedded type.
Background technique
Wind power plant basic engineering field at sea, according to different earth formation and characteristic, and according to each rock-soil layer origin cause of formation
Type and engineering characteristic carry out comprehensive division, and the single-pile foundation generallyd use includes non-embedding rock single pile, embedding rock single pile and embedded type
Embedding rock single pile.The construction of pile foundation is the leading engineering of offshore wind farm project, and for separate land and the depth of water is up to 16m~19m's
Off-lying sea carries out the construction of offshore wind farm without shielding region, due to the constraint by natural conditions such as meteorology, trend, waves, and is in
Take place frequently region and Fan Equipment of tropical storm has very high requirement to the carrying on basis, withdrawal resistance, deformation, it is therefore desirable to
Pile foundation diameter is big, embedded depth is deep, so that blower foundation can bear huge blower tilting moment and bear wave, water flow lotus
Load effect, there are also be exactly construction speed duration control it is particularly critical.
Summary of the invention
A kind of embedding rock list of offshore wind power foundation embedded type is provided it is an object of the invention to overcome the deficiencies of existing technologies
The construction technology of stake, it can be improved construction efficiency, effectively improves the horizontal resistivity and anti-group of ability of embedded rock pile, meets work
The requirement of journey structure design and construction.
The object of the present invention is achieved like this:Involved by a kind of construction technology of the embedding rock single pile of offshore wind power foundation embedded type
And single pile using diameter 6.7m, 60~80mm of wall thickness steel-pipe pile, squeeze into cataclastic shape strong weathered granite, total embedded depth
For 22.9~27.6m, height of pile top 15m, stake bottom about -43~-46m of absolute altitude;
Construction technology of the invention includes following below scheme:Steel-pipe pile and steel pile casting production, steady stake putting up platform, steel pile casting are inserted
Dress, steel pile casting vibration set, drill, the implantation of borehole cleaning, steel-pipe pile, back cover concrete placings, the rockfill grouting of stake outer wall and recycle steel pile casting;Its
In,
The steel-pipe pile and steel pile casting production process include tube coupling blanking, tube coupling retaining wall on slope, tube coupling roll-forming, pile body
Top flange assembly, pile body splicing and corrosion-inhibiting coating coating step;
The steady stake putting up platform process includes the following steps:
1. steady stake platform includes upper and lower platform, four auxiliary process stakes, two positioning process stakes and a set of positioning system;
Lower platform and four auxiliary process stakes are positioned by steel-pipe pile relative position at the Longkou of locating platform ship and lower platform, then
The inserting piling of four auxiliary process stakes is carried out, then leads to auxiliary process stake and the auxiliary process pipe casing upper and lower part on lower platform
Cross steel plate strip firm welding;
2. first removing locating platform ship, then two positioning process stakes of inserting piling, then will be in positioning process stake and lower platform
Positioning process pipe casing upper and lower part passes through steel plate strip firm welding;
3. installing upper mounting plate after steel pile casting inserting process;
The steel pile casting inserting process includes the following steps:
1. the lower platform of steady stake platform is processed into guiding body panel, the center for being oriented to body panel is in steel-pipe pile
The heart;
2. lifting lug is arranged at 2m below steel pile casting top surface, hangs ship using auxiliary and lift by crane steel pile casting;Steel pile casting is hung by auxiliary
Ship is lifted to guiding body panel and slowly falls into, and stops sinking when lower platform of the steel pile casting by guiding body panel, using two
Platform horizontal ruler measures the verticality of steel pile casting, after verticality meets the requirements, passes through hydraulic jack in the bottom of guiding body panel
It holds tightly, then slowly sinks;
3. when steel pile casting is drowned into mud face intersection, the verticality of measurement review steel pile casting meets the requirements and is further continued for down
It is sink to stabilization, then is covered using hydraulic four-axle linkage vibration hammer at the top of steel pile casting, lifts by crane hydraulic four-axle linkage vibration hammer with the auxiliary ship that hangs,
It carries out vibration dip to steel pile casting to set, the used in-degree to steel pile casting, which reaches, stops hammer standard, stops the verticality of hammer review steel pile casting, meets
Design requirement reinforces steel pile casting and the connection for being oriented to body panel again;
The drilling process includes drilling machine in place, installation drilling rod, slurrying and drilling and forming hole step;
When carrying out drilling machine step in place, hydraulic four-axle linkage vibration hammer is first hung, then set up drilling machine, is bored using hobboing cutter is configured with
The gas lift reverse circulation hydraulic power drilling machine of head is locked drilling machine and steel pile casting by pile gripper;
When carrying out installation drilling rod step, drill bit, drilling rod are installed to drilling machine after assembly well on the main deck for hanging ship again
On;
Carry out slurrying step when, slurry coat method using do not disperse, low solid phase, highly viscous PHP high performance slurry, first
Bentonite slurry is stirred using slurry mixer in mud pit, is then pumped in steel pile casting using slush pump, works as steel pile casting
Aperture is crept into after interior mud property index meets construction requirement;
Carry out drilling and forming hole step when, drilling machine starting drilling when, bore diameter is ascending, top loosely soil layer when bore
Aperture, bore diameter should be 200mm or more smaller than the internal diameter of steel-pipe pile, and bore diameter should be expanded by encountering the hard lithosphere in lower part,
Bore diameter is 100mm~200mm bigger than the internal diameter of steel-pipe pile;
When carrying out the borehole cleaning process, by drilling tool lifting extremely from 30~50cm of bottom hole, slow rotary tools, and supplement high-quality
Mud carries out reacting cycle borehole cleaning, while head in retaining hole, prevents collapse hole;
When carrying out steel-pipe pile implantation process, drilling machine is first removed, ship is hung using main and auxiliary hangs by the way of ship cooperates and lift
Steel-pipe pile is refuted into upper lifting and soldier piles from pile transport, and ship is hung by master, steel-pipe pile is put into steel pile casting, then passes through positioning system
System positions steel-pipe pile to the pile center position of steel pile casting, then holds steel-pipe pile tightly using the jack on lower platform, confirms steel pipe
The centre deviation of stake in error, and the verticality for checking steel-pipe pile meet the requirements after hang ship using main and slowly transfer steel-pipe pile,
Until steel-pipe pile stops sinking, hydraulic pile hammer is then set at the top of steel-pipe pile, it is hydraulic to beat after steel-pipe pile is sink to certainly and stablizes
The small energy of pile monkey slowly hammers stake top tooling flange, and the hit energy of hydraulic pile hammer is ascending, until steel-pipe pile arrival is set
Count bottom absolute altitude;
When carrying out the back cover concrete placings process, back cover height is 1.5m, using C40 non-dispersible underwater concrete, and is adopted
Three point perfusions, including conduit installation, secondary pile hole cleaning, underwater concreting and strike-on step are carried out with vertical conduit method;
When carrying out the stake outer wall rockfill grouting process, i.e., it is in the milk between the bottom outer wall of steel-pipe pile and ground;
When carrying out the recycling steel pile casting process, steel pile casting is extracted by hydraulic four-axle linkage vibration hammer.
The construction technology of the embedding rock single pile of above-mentioned offshore wind power foundation embedded type, wherein complete the brill of the drilling process
Into before pore formation step, in order to prevent collapse hole, advanced horizontal high voltage jet grouting pile construction;Construction of High Pressure Jet Grouting Pile includes drilling, lower injection
Pipe, injection, pile process;Drill internal diameter Φ 600mm, and the inner wall 300mm along internal diameter Φ 750mm steel pile casting is circumferentially disposed, adjacent
Hole overlaps 100mm;When whirl spraying, injection pressure is 0.6~0.8MPa, and injection flow is 0.8~1.2m3/min;Injection pipe is promoted
Speed is 10~15cm/min, and injection pipe revolving speed is 10~15r/min.
The construction technology of the embedding rock single pile of above-mentioned offshore wind power foundation embedded type, wherein carrying out the steel-pipe pile implantation
When process, stake top tooling flange should be installed at the top of steel-pipe pile, stake top tooling flange is L tee section structure, by coupling spiral shell
Bolt is fitted closely with stake top flange and is connect.
The construction technology of the embedding rock single pile of above-mentioned offshore wind power foundation embedded type, wherein the back cover concrete placings process
When conduit installation steps, job platform first is set up at the top of the steel-pipe pile, three internal diameters are installed on the job platform is
The conduit of 300mm and the grouting hopper being connect with three with the top of three conduits;Three conduits are in their line of centres
The mode of equilateral triangle is arranged in stake holes, and the long flow radius 2.5 for being equal to concrete of each edge of equilateral triangle~
4.0m, the bottom end of every conduit are 30~50cm apart from stake holes bottom;When carrying out secondary pile hole cleaning step, first by air hose tripping in conduit
Interior, air hose top is connected by special joint with the tracheae of air compressor machine, and special joint is connect with conduit;Then conduit is mentioned
Certain altitude is played, which determined according to the precipitating thickness at stake holes bottom, and air compressor machine gas supply is then turned on, and gas lift reverse circulation is normal
Afterwards, conduit is slowly transferred in circulation, until conduit is transferred to stake holes bottom, sand content is met the requirements in mud to be discharged, i.e.,
Stake holes bottom sediment is removed clean;When carrying out underwater concreting step, it is pumped in conduit after live mixing concrete, from hole
Bottom up pours;When carrying out strike-on step, steel-pipe pile is struck to designed elevation before concrete initial set using hydraulic pile hammer.
The construction technology of the embedding rock single pile of above-mentioned offshore wind power foundation embedded type, wherein carry out the stake outer wall backfill and fill
When starching process, four sets of grouting systems are set, and every set grouting system includes four Grouting Pipes and four return pipes;When slip casting first
Slip casting is carried out to stake end grouting system, blocks return pipe when return pipe pulp, slip casting is continued to Grouting Pipe, until reaching volume
Grouting pressure is determined, after flow rate of grouting is less than 2L/min and maintains 0.5h under specified grouting pressure, or during slip casting suddenly
When there is the case where flow rate of grouting increases, grouting pressure is die-offed, stops slip casting and block grouting port.
The construction technology of the embedding rock single pile of offshore wind power foundation embedded type of the invention is adopted using steady stake platform auxiliary positioning
Carry out embedding rock construction with steel pile casting, using it is main hang ship and it is auxiliary hang ship cooperation steel-pipe pile lift by crane to and is inserted into steel pile casting, can be efficient complete
At piling construction, it is also equipped with adaptable hammering equipment and drilling device, the posture of monitored over time and adjustment steel-pipe pile, to guarantee
Single pile is smooth and is vertically driven into marine rock layer, while taking specific aim measure, and hole wall is kept to stablize, pre- preventing sticking,
The appearance of the unusual conditions such as burying not only ensure that the bearing capacity of embedding rock single pile and the stability of pile body, also effectively increase and apply
Work efficiency rate, and the horizontal resistivity and anti-group of ability of embedded rock pile are effectively improved, meet Structural Design and construction
It is required that.
Detailed description of the invention
Fig. 1 is the flow chart of the construction technology of the embedding rock single pile of offshore wind power foundation embedded type of the invention;
Fig. 2 a is the master for the steady stake platform that the construction technology of the embedding rock single pile of offshore wind power foundation embedded type of the invention uses
View;
Fig. 2 b is the floor map of the upper platform in the lower platform of steady stake platform of the invention;
Fig. 2 c is the floor map of lower layer's platform in the lower platform of steady stake platform of the invention;
Fig. 3 is that the construction technology of the embedding rock single pile of offshore wind power foundation embedded type of the invention is carrying out steel-pipe pile implantation process
When state diagram;
Fig. 4 is that the construction technology of the embedding rock single pile of offshore wind power foundation embedded type of the invention is carrying out back cover concrete placings process
The structural schematic diagram of the grouting system of Shi Caiyong;
Fig. 5 is that the construction technology of the embedding rock single pile of offshore wind power foundation embedded type of the invention is carrying out back cover concrete placings process
When conduit layout drawing;
Fig. 6 is that the construction technology of the embedding rock single pile of offshore wind power foundation embedded type of the invention is carrying out the rockfill grouting of stake outer wall
The schematic diagram at grouting position when process.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings.
Please refer to Fig. 1 to Fig. 6, list involved in the construction technology of the embedding rock single pile of offshore wind power foundation embedded type of the invention
Stake is squeezed into cataclastic shape strong weathered granite, total embedded depth is 22.9 using the steel-pipe pile of diameter 6.7m, 60~80mm of wall thickness
~27.6m, height of pile top 15m, stake bottom about -43~-46m of absolute altitude.
The construction technology of the embedding rock single pile of offshore wind power foundation embedded type of the invention includes following below scheme:Steel-pipe pile and steel shield
Cylinder production, the inserting of steady stake putting up platform, steel pile casting, steel pile casting vibration sets, drills, borehole cleaning, steel-pipe pile are implanted into, back cover concrete placings, stake
Outer wall rockfill grouting and recycling steel pile casting.
Steel-pipe pile and steel pile casting production process include tube coupling blanking, tube coupling retaining wall on slope, tube coupling roll-forming, pile body top
Flange assembly, pile body splicing and corrosion-inhibiting coating coating step.
Steady stake platform 10 includes upper mounting plate 12, the auxiliary process stake 13, two of lower platform 11, four positioning process stake 14, outer
Longkou beam 15 and a set of positioning system being made of 12 100T jack 20;Lower platform 11 is by upper platform 111 and lower layer
Platform 112 is constituted, and arranges seven jack 20 around Longkou on upper platform 111, lower layer's platform 112 is around Longkou and and upper layer
Seven jack 20 on platform 111 arrange five jack 20 with being staggered;Outer Longkou beam 15 is pacified after steel-pipe pile 100 enters Longkou
Mounted in the Longkou of upper platform 111 (see Fig. 2 a to Fig. 2 c).
Steady stake putting up platform process includes the following steps:
1. steady stake platform includes upper and lower platform, four auxiliary process stakes, two positioning process stakes and a set of by 12 100T
The positioning system of jack composition;Lower platform and four auxiliary process stakes pass through steel pipe at the Longkou of locating platform ship and lower platform
Stake relative position is positioned, then carries out the inserting piling of four auxiliary process stakes, then by auxiliary process stake with it is auxiliary on lower platform
Assistant engineer skill pipe casing upper and lower part passes through steel plate strip firm welding;
2. first removing locating platform ship, then two positioning process stakes of inserting piling, then will be in positioning process stake and lower platform
Positioning process pipe casing upper and lower part passes through steel plate strip firm welding;
3. upper mounting plate is installed after steel pile casting inserting process, to carry out embedding rock construction.
Steel pile casting inserting process includes the following steps:
1. the lower platform of steady stake platform is processed into guiding body panel, the center for being oriented to body panel is in steel-pipe pile
The heart;
2. lifting lug is arranged at 2m below steel pile casting top surface, hangs ship using auxiliary and lift by crane steel pile casting;Steel pile casting is hung by auxiliary
Ship is lifted to guiding body panel and slowly falls into, and stops sinking when lower platform of the steel pile casting by guiding body panel, using two
Platform horizontal ruler measures the verticality of steel pile casting, after verticality meets the requirements, passes through hydraulic jack in the bottom of guiding body panel
It holds tightly, then slowly sinks;
3. when steel pile casting is drowned into mud face intersection, the verticality of measurement review steel pile casting meets the requirements and is further continued for down
It is sink to stabilization, then is covered using hydraulic four-axle linkage vibration hammer at the top of steel pile casting, lifts by crane hydraulic four-axle linkage vibration hammer with the auxiliary ship that hangs,
It carries out vibration dip to steel pile casting to set, the used in-degree to steel pile casting, which reaches, stops hammer standard, stops the verticality of hammer review steel pile casting, meets
Design requirement reinforces steel pile casting and the connection for being oriented to body panel again.
Drilling process includes drilling machine in place, installation drilling rod, slurrying and drilling and forming hole step;
When carrying out drilling machine step in place, hydraulic four-axle linkage vibration hammer is first hung, then set up drilling machine, is bored using hobboing cutter is configured with
The gas lift reverse circulation hydraulic power drilling machine of head is locked drilling machine and steel pile casting by pile gripper, and guarantee drill bit of drilling machine center and
On same plumb line, deviation is not greater than 10cm at the center of steel pile casting;
When carrying out installation drilling rod step, when rough drill, drill bit is made of heavy balancer and stem;Drill bit, drilling rod are equal
It is installed on drilling machine again after assembly is good on the main deck for hanging ship, in drilling process, the second section drilling rod and subsequent drilling rod are direct
It is installed on the main platform for hanging ship;
Carry out slurrying step when, slurry coat method using do not disperse, low solid phase, highly viscous PHP high performance slurry, first
Bentonite slurry is stirred using slurry mixer in mud pit, is then pumped in steel pile casting using slush pump, works as steel pile casting
Aperture is crept into after interior mud property index meets construction requirement;
Carry out drilling and forming hole step when, using mud off, at the same should the moisturizing into steel pile casting in time, keep steel pile casting in
Outer head difference;Drilling machine starting drilling when, bore diameter is ascending, top loosely soil layer when bore aperture, bore diameter should compare
The small 200mm or more of the internal diameter of steel-pipe pile, to guarantee the vertical bearing capacity of steel pile casting, encountering the hard lithosphere in lower part should expand
Bore diameter, bore diameter are 100mm~200mm bigger than the internal diameter of steel-pipe pile;
Before carrying out drilling and forming hole step, in order to prevent collapse hole, advanced horizontal high voltage jet grouting pile construction, Construction of High Pressure Jet Grouting Pile
Including drilling, lower injection pipe, injection, pile process;Drill internal diameter Φ 600mm, along the inner wall of internal diameter Φ 750mm steel pile casting
300mm is circumferentially disposed, and adjacent holes overlap 100mm;When whirl spraying, injection pressure be 0.6~0.8MPa, injection flow be 0.8~
1.2m3/min;It is 10~15cm/min that injection pipe, which promotes speed, and injection pipe revolving speed is 10~15r/min.
When carrying out borehole cleaning process, by drilling tool lifting extremely from 30~50cm of bottom hole, slow rotary tools, and high-quality mud is supplemented
Slurry carries out reacting cycle borehole cleaning, while head in retaining hole, prevents collapse hole;
When carrying out steel-pipe pile implantation process, steel pile casting internal drilling and borehole cleaning to designed elevation, and after the completion of whole hole is checked and accepted
Shut down in time and remove drilling rod, first remove drilling machine, it is main hang ship and it is auxiliary hang that ship is in place, hang ship and the auxiliary side hanging ship cooperation and lifting using main
Steel-pipe pile is refuted upper lifting and soldier piles from pile transport by formula, and master hangs ship and connect with the main lifting lug on steel-pipe pile top, auxiliary to hang ship and steel-pipe pile
The turn lifting lug of lower part connects, and hangs ship by master and steel-pipe pile is put into steel pile casting, then positions steel-pipe pile 100 to steel and protects
The pile center position of cylinder 300, then steel-pipe pile is held tightly using the jack on lower platform, confirm the centre deviation of steel-pipe pile in error
It is interior, and the verticality for checking steel-pipe pile meet the requirements after hang ship using main and slowly transfer steel-pipe pile, until steel-pipe pile stops sinking,
Then hydraulic pile hammer is set at the top of steel-pipe pile, after steel-pipe pile is sink to certainly and stablizes, the small energy of hydraulic pile hammer is slowly hammered
Stake top tooling flange, stake top tooling flange are L tee section structure, are fitted closely and are connect with stake top flange by attachment bolt, made
Hydraulic pile hammer hammers on stake top tooling flange, to protect stake top flange to be damaged when beating;Hydraulic pile hammer is hit
It is ascending to beat energy, until steel-pipe pile reaches design bottom absolute altitude;Pile body verticality is paid close attention in pile driving process, it is ensured that steel pipe
The verticality of stake is within 3 ‰ (see Fig. 3);
When carrying out back cover concrete placings process, back cover height is 1.5m, using C40 non-dispersible underwater concrete, and using vertical
Straight catheter method carries out three point perfusions, including conduit installation, secondary pile hole cleaning, underwater concreting and strike-on step;
When conduit installation steps, job platform is first set up at the top of steel-pipe pile, is installed in three on the job platform
Diameter be 300mm conduit 30 and with three and the sequentially connected grouting interior hopper 31 in the top of three conduits 30 and outer hopper 32
(see Fig. 4 and Fig. 5);Three conduits 30 are arranged in stake holes in their line of centres mode in equilateral triangle, and equilateral three
Long 2.5~the 4.0m of flow radius for being equal to concrete of angular each edge, the bottom end of every conduit 30 apart from stake holes bottom be 30~
50cm;
When carrying out secondary pile hole cleaning step, first by air hose tripping in conduit, air hose top passes through special joint and air compressor machine
Tracheae connects, and special joint is connect with conduit;Then conduit is lifted into certain altitude, which is according to the heavy of stake holes bottom
Shallow lake thickness determines, is then turned on air compressor machine gas supply, after gas lift reverse circulation is normal, conduit is slowly transferred in circulation, until conduit
Decentralization is to stake holes bottom, and sand content is met the requirements in mud to be discharged, i.e., stake holes bottom sediment is removed clean;
When carrying out underwater concreting step, it is pumped in conduit after live mixing concrete, is up poured from bottom hole;
When carrying out strike-on step, steel-pipe pile is struck to designed elevation before concrete initial set using vibration hammer.
When carrying out stake outer wall rockfill grouting process, i.e., be in the milk between the bottom outer wall and ground of steel-pipe pile 100 (see
Fig. 6);Four sets of grouting systems are set, and every set grouting system includes four Grouting Pipes and four return pipes;First to stake when slip casting
The grouting system of end carries out slip casting, blocks return pipe when return pipe pulp, continues slip casting to Grouting Pipe, until reaching specified
Grouting pressure, flow rate of grouting goes out suddenly less than 2L/min and after maintaining 0.5h, or during slip casting under specified grouting pressure
When the case where existing flow rate of grouting increases, grouting pressure is die-offed, stops slip casting and block grouting port.
The construction technology of offshore wind power foundation embedded type embedded rock pile of the invention is used using steady stake platform auxiliary positioning
Steel pile casting carries out embedding rock construction, using it is main hang ship and it is auxiliary hang ship cooperation steel-pipe pile lifted by crane to and is inserted into steel pile casting, can efficiently complete
Piling construction is also equipped with adaptable hammering equipment and drilling device, the posture of monitored over time and adjustment steel-pipe pile, to guarantee list
Stake is smooth and is vertically driven into marine rock layer, while taking specific aim measure, and hole wall is kept to stablize, and pre- preventing sticking buries
The appearance of the unusual conditions such as brill, not only ensure that the bearing capacity of non-embedding rock single pile and the stability of pile body, also effectively increases and apply
Work efficiency rate, and the horizontal resistivity and anti-group of ability of embedded rock pile are effectively improved, meet Structural Design and construction
It is required that.
Above embodiments are used for illustrative purposes only, rather than limitation of the present invention, the technology people in relation to technical field
Member, without departing from the spirit and scope of the present invention, can also make various transformation or modification, therefore all equivalent
Technical solution also should belong to scope of the invention, should be limited by each claim.