CN114837178A - Installation method of wind power foundation pile - Google Patents
Installation method of wind power foundation pile Download PDFInfo
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- CN114837178A CN114837178A CN202210649513.XA CN202210649513A CN114837178A CN 114837178 A CN114837178 A CN 114837178A CN 202210649513 A CN202210649513 A CN 202210649513A CN 114837178 A CN114837178 A CN 114837178A
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Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D13/00—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D13/00—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers
- E02D13/04—Guide devices; Guide frames
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D13/00—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers
- E02D13/08—Removing obstacles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/44—Foundations for machines, engines or ordnance
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/52—Submerged foundations, i.e. submerged in open water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
- E02D7/02—Placing by driving
- E02D7/06—Power-driven drivers
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
- E02D7/18—Placing by vibrating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/727—Offshore wind turbines
Abstract
The invention discloses an installation method of a wind power foundation pile, which comprises the following steps: acquiring a pile position of a wind power foundation pile; based on the pile position, positioning a floating crane, a transport ship and a pile gripper; fixing the pile gripper, and putting the wind power foundation pile into the pile gripper; putting the wind power foundation pile into mud for positioning; fixing a main machine of a drilling machine on a wind power foundation pile, and enabling a drill bit of the drilling machine to penetrate through the wind power foundation pile downwards; filling slurry into the wind power foundation pile; drilling by a drilling machine in multiple times and correspondingly sinking the piles until the drilling reaches the final preset depth and the pile sinking is in place; and pumping out the slurry in the wind power foundation pile, discharging slag and pouring concrete into the wind power foundation pile. The method effectively solves the technical problems that the wind power foundation pile installation construction is time-consuming and labor-consuming and high in cost because a pile casing and a drilling machine installation device are specially arranged in the wind power foundation pile installation method in the prior art, reduces construction links, reduces construction cost and greatly reduces safety risks.
Description
Technical Field
The invention relates to the technical field of wind turbine foundation construction, in particular to a method for installing a wind power foundation pile.
Background
The offshore wind power station has the advantages of large wind speed, long effective power generation time, no land occupation, close distance from a load center and the like, and has good development prospect. The wind power foundation pile is used for installing a fan and mainly bears horizontal load effects of wind, waves, current, ice and the like, the offshore environment is complex and changeable, and the stability of the wind power foundation pile is of great importance.
Patent CN 103924585B discloses an installation method of a wind power foundation pile, which includes the following steps: (1) pile position measurement lofting; (2) embedding a pile casing; (3) forming holes by rotary digging; (4) treating the slurry; (5) cleaning holes; (6) hoisting the steel piles; (7) pouring underwater concrete; (8) filling sand; (9) and pulling out the steel sheath.
In the installation method, the protective cylinder is embedded to play a role in retaining water and positioning so as to provide a drilling environment for the drill bit, the protective cylinder needs to be embedded in advance and dismantled afterwards, time and labor are wasted, and the construction cost is also increased. In addition, the drilling machine also needs to be additionally provided with a mounting device (a supporting platform, which is generally a pile embracing frame), and also needs to be built in advance and dismantled afterwards, so that time and labor are wasted, and the construction cost is increased.
Therefore, the prior art has at least the following technical problems: the method for installing the wind power foundation pile in the prior art needs to specially arrange the pile casing and the drilling machine installation device, so that the installation and construction of the wind power foundation pile are time-consuming and labor-consuming and high in cost.
Disclosure of Invention
The embodiment of the application provides an installation method of a wind power foundation pile, and solves the technical problems that in the installation method of the wind power foundation pile in the prior art, a pile casing and a drilling machine installation device need to be specially arranged, so that the installation and construction of the wind power foundation pile are time-consuming and labor-consuming and high in cost.
The embodiment of the application provides an installation method of a wind power foundation pile, which comprises the following steps:
step S10, pile positions of the wind power foundation piles are obtained;
step S20, based on the pile position, positioning the floating crane, the transport ship and the pile gripper;
step S30, fixing the pile gripper, and putting the wind power foundation pile into the pile gripper;
step S40, the wind power foundation pile is placed into mud for positioning;
step S50, fixing a main machine of a drilling machine on the wind power foundation pile, and enabling a drill bit of the drilling machine to downwards penetrate through the wind power foundation pile;
step S60, slurry is filled into the wind power foundation pile;
step S70, the drilling machine drills holes in several times and correspondingly sinks piles until the drilling reaches the final preset depth and the sinking piles are in place;
and step S80, pumping out mud and slag in the wind power foundation pile, and pouring concrete into the wind power foundation pile.
Further, the step S20 includes:
step S21: determining the placement positions of the floating crane, the transport ship and the pile gripper on the transport ship based on the pile positions;
step S22: the floating crane, the transport ship and the pile gripper are positioned at respective placing positions.
Further, the step S30 specifically includes:
step S31, fixing the pile gripper;
step S32, preprocessing the wind power foundation pile: the lower half part of the wind power foundation pile is provided with a plurality of radial through hole rings at intervals along the axial direction of the wind power foundation pile, each radial through hole ring comprises a plurality of radial through holes arranged at intervals along the circumferential direction of the wind power foundation pile, and the radial through holes are communicated along the radial direction of the wind power foundation pile; at least two strain sensing optical cables are symmetrically distributed on the inner surface of the wind power foundation pile, and the strain sensing optical cables are used for measuring the stress value of the pile body;
and step S33, placing the wind power foundation pile into the pile embracing device and positioning.
Further, in step S31, the fixing pile clip is fixed by: driving the small piles on the pile gripper into the sludge by using a vibration hammer, so that the pile gripper is fixed on the seabed;
in the step S33, the wind power foundation pile is placed in the pile gripper in the following manner: the first floating crane and the second floating crane are used in a matched mode to place the wind power foundation pile into the pile gripper, wherein the first floating crane is used for lifting the wind power foundation pile to lift the upper end of the wind power foundation pile, and the second floating crane serves as a tail sliding crane to lift the lower end of the wind power foundation pile.
Further, the step S40 specifically includes: the wind power foundation pile automatically sinks into the mud due to dead weight, and the wind power foundation pile is driven into the seabed to the preset depth by using the pile driving hammer after the wind power foundation pile is not moved.
Further, in step S50, the main machine of the drilling machine is fixed on the wind power foundation pile by: be equipped with the pneumatic cylinder that is used for fixing a plurality of symmetry setting on wind-powered electricity generation foundation pile with the host computer on the host computer base, the pneumatic cylinder setting is around wind-powered electricity generation foundation pile to set up along the circumference interval of wind-powered electricity generation foundation pile, the piston rod of pneumatic cylinder can be followed wind-powered electricity generation foundation pile and radially stretched out and drawn back, when the piston rod all extends to the outer wall of supporting tight wind-powered electricity generation foundation pile to wind-powered electricity generation foundation pile in the middle, the host computer centering and locking are on wind-powered electricity generation foundation pile, thereby firmly fix the rig on wind-powered electricity generation foundation pile.
Further, the step S60 includes:
step S61, preparing mud;
and step S62, the wind power foundation pile is pumped out, and slurry is filled into the wind power foundation pile to the working surface of the drilling machine so as to submerge the drill bit.
Further, the step S70 specifically includes:
s71, starting a drilling machine, starting a drill bit to drill downwards, and simultaneously continuously filling slurry into the wind power foundation pile 6 while discharging slag by pumping the slurry with slag in the wind power foundation pile;
s72, filtering the pumped slurry, adding the filtered slurry into the wind power foundation pile again for cyclic utilization, periodically checking the viscosity and density of the filtered slurry, directly adding the filtered slurry into the wind power foundation pile again if the viscosity and density of the filtered slurry meet the requirements, and otherwise, adding the filtered slurry into the wind power foundation pile after adjustment;
s73: when the drill bit drills to the corresponding single preset depth, whether the drill bit drills to the single preset depth is determined through checking slag discharge, if the drill bit does not drill to the corresponding single preset depth, the steps S71-S73 are repeated until the drill bit drills to the single preset depth;
s74: the drill bit is drilled to a single preset depth, the drill bit is lifted, the drill is loosened, the drill is moved away from the wind power foundation pile through the floating crane, the wind power foundation pile is driven into the drill hole through the pile driving hammer, and pile sinking is in place.
Further, the step S80 specifically includes:
step S81, pumping out mud and slag in the wind power foundation pile by a mud pump;
step S82, placing a grouting guide pipe in the wind power foundation pile, wherein the opening end of the grouting guide pipe extends to the top end of the wind power foundation pile, the outlet end of the grouting guide pipe extends to the bottom end of the wind power foundation pile, and a plurality of grout outlets are distributed in the grouting guide pipe along the length direction;
step S83, pouring concrete into the wind power foundation pile until the wind power foundation pile is filled with the concrete;
step S84, after concrete pouring is finished, using clear water to open the plug, so that the grouting guide pipe is smooth;
and step S85, cement slurry is injected into the grouting guide pipe, and flows into gaps among hardened concrete from the slurry outlet, so that a high-strength wind power foundation pile is formed, and a fan is convenient to install.
Further, the step S83 specifically includes:
pouring concrete into the wind power foundation pile by adopting a guide pipe, pouring the concrete into the wind power foundation pile by the guide pipe, wherein the distance between a bottom opening of the guide pipe and the bottom of a hole is 30-50 cm, and when the burial depth of the bottom end of the guide pipe in the concrete reaches 5-10 m, lifting the guide pipe upwards until the burial depth is not less than 1m, and then continuously pouring the concrete through the guide pipe;
when the distance between the poured concrete and the pile top of the wind power foundation pile is 5m, pouring while vibrating, wherein the pouring height is not more than 1.5m each time;
after the perfusion is finished, the mixture is vibrated for about 10min by a vibrating rod to prevent bubbles from generating.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
through fixing the rig on wind-powered electricity generation foundation pile, need not additionally to set up and embrace the pile frame, in addition, the drill bit penetrates in the wind-powered electricity generation foundation pile downwards, and pass wind-powered electricity generation foundation pile along the axial, wind-powered electricity generation foundation pile has acted as the pile casing of drill bit, need not to set up in addition and protect a section of thick bamboo, thereby reduced the construction procedure, the work efficiency is improved, effectively solved wind-powered electricity generation foundation pile installation method among the prior art and need set up pile casing and rig installation device specially, lead to wind-powered electricity generation foundation pile installation construction waste time and energy and with high costs technical problem, the construction link has been reduced, construction cost is reduced, the safety risk has greatly been reduced, can adapt to the construction of the wind-powered electricity generation rock-socketed pile in the stratum seabed.
Drawings
Fig. 1 is a schematic flow chart of an installation method of a wind power foundation pile according to an embodiment of the present application;
fig. 2 is a front view of a part of a structure of a transport ship used in an installation method of a wind power foundation pile according to an embodiment of the present application;
fig. 3 is a top view of a part of a transport ship structure used in an installation method of a wind power foundation pile according to an embodiment of the present application;
fig. 4 is a schematic flow chart of the positioning of the floating crane, the transport ship and the pile gripper based on the pile position according to the embodiment of the present application;
fig. 5 is a schematic flow chart illustrating a process of fixing a pile gripper, placing a wind power foundation pile into the pile gripper, and positioning the wind power foundation pile according to an embodiment of the present application;
FIG. 6 is a schematic structural diagram of a drilling machine matched with a wind power foundation pile according to an embodiment of the application;
fig. 7 is a schematic flow chart of adding mud into a wind power foundation pile according to an embodiment of the present application.
Detailed Description
The embodiment of the application provides an installation method of a wind power foundation pile, and solves the technical problems that in the installation method of the wind power foundation pile in the prior art, a pile casing and a drilling machine installation device need to be specially arranged, so that the installation and construction of the wind power foundation pile are time-consuming and labor-consuming and high in cost.
In order to solve the technical problems, the technical scheme provided by the application has the following general idea: through fixing the rig on wind-powered electricity generation foundation pile, need not additionally to set up and embrace the pile frame, in addition, the drill bit penetrates in the wind-powered electricity generation foundation pile downwards, and pass wind-powered electricity generation foundation pile along the axial, wind-powered electricity generation foundation pile has acted as the pile casing of drill bit, need not to set up the pile casing in addition again, thereby construction procedures have been reduced, and work efficiency is improved, effectively solved wind-powered electricity generation foundation pile installation method among the prior art and need set up pile casing and rig installation device specially, lead to wind-powered electricity generation foundation pile installation and construction to waste time and energy and with high costs's technical problem, the construction link has been reduced, construction cost is reduced, safety risk has greatly been reduced, can adapt to the construction of the wind-powered electricity generation embedded rock pile in the stratum seabed.
The technical solutions of the present application are described in detail below with reference to the drawings and specific embodiments, and it should be understood that the specific features in the embodiments and examples of the present application are detailed descriptions of the technical solutions of the present application, and are not limitations of the technical solutions of the present application, and the technical features in the embodiments and examples of the present application may be combined with each other without conflict.
Fig. 1 is an installation method of a wind power foundation pile in an embodiment of the present application, and as shown in fig. 1, the installation method includes the following steps:
step S10: and acquiring the pile position of the wind power foundation pile 6.
Specifically, wind-powered electricity generation foundation pile 6's pile position indicates wind-powered electricity generation foundation pile 6 is at the mounted position of offshore wind farm, and this application embodiment obtains wind-powered electricity generation foundation pile 6's pile position through pile driving positioning system, wherein, pile driving positioning system utilizes GPS high accuracy location, can accurately find wind-powered electricity generation foundation pile 6 predesigned pile position, but pile driving positioning system belongs to prior art, and does not belong to the scope that this application embodiment required protection, no longer gives unnecessary details here.
Step S20: based on the pile position, the floating crane, the transport vessel 2 and the pile gripper 1 are put in place.
As shown in fig. 4, the step S20 specifically includes:
step S21: determining the placement positions of the floating crane, the transport ship 2 and the pile gripper 1 on the transport ship 2 based on the pile positions;
step S22: the floating crane, the transport vessel 2 and the pile gripper 1 are brought into their respective installation positions.
Specifically, the wind power foundation pile 6 is a steel pipe pile and penetrates through the steel pipe pile in the axial direction. The floating crane, also called a crane ship, is used for lifting the wind power foundation pile 6. The transport ship 2 is used for transporting the wind power foundation piles 6 from the wharf to the pile positions. Pile gripper 1 sets up on the bow of transport ship 2, and pile gripper 1 includes the hydraulic system that arm and control arm held tightly, and the assigned position of pile gripper 1 is hung into wind-powered electricity generation foundation pile 6 to the floating crane, thereby control hydraulic system tightens up arm and makes wind-powered electricity generation foundation pile location carry out the installation operation. The floating crane, the transport ship 2 and the pile gripper 1 are in place, that is, the floating crane and the transport ship 2 are respectively positioned around the pile position, and the pile gripper 1 is positioned above the pile position and aligned with the pile position.
In addition, the construction ship (floating crane and transport ship 2) should be selected to carry out construction operation in a proper climatic environment, and the floating crane should be operated by operators with abundant experience in offshore operation.
Step S30: fixing the pile gripper 1, and placing the wind power foundation pile 6 into the pile gripper 1 for positioning;
as shown in fig. 5, the step S30 specifically includes the following steps:
step S31: fixing the pile gripper 1;
specifically, as shown in fig. 2 and 3, four corners of the pile gripper 1 are respectively provided with a fixing small pile 3, and 4 small piles 3 on the pile gripper 1 are driven into sludge by using a vibration hammer on a transport ship 2, so that the pile gripper 1 is fixed on the seabed.
Step S32: preprocessing the wind power foundation pile 6;
the method comprises the following specific steps: a plurality of radial through hole rings are arranged on the lower half portion of the wind power foundation pile 6 at intervals along the axial direction of the wind power foundation pile 6, each radial through hole ring comprises a plurality of radial through holes which are arranged at intervals along the circumferential direction of the wind power foundation pile 6 and enclose a circle, and the radial through holes are communicated along the radial direction of the wind power foundation pile 6; and at least two strain sensing optical cables are symmetrically distributed on the inner surface of the wind power foundation pile 6 and used for measuring the stress value of the pile body.
The strain sensing optical cables (NZS-DSS-C07) are fixedly adhered to the inner surface of the wind power foundation pile 6, the first end of each strain sensing optical cable (NZS-DSS-C07) is reserved outside the wind power foundation pile 6, the second end of each strain sensing optical cable (NZS-DSS-C07) penetrates into the bottom end of the wind power foundation pile 6 in the axial direction of the wind power foundation pile 6, penetrates out of the top opening of the wind power foundation pile 6 in the axial direction of the wind power foundation pile 6 after being turned, and is closed with the second end; the strain sensing optical cable (NZS-DSS-C07) is used for being connected with an external controller, the strain sensing optical cable acquires a strain value and transmits the strain value to the controller, the controller acquires a pile body stress value according to the strain value, and a calculation method for acquiring the pile body stress value according to the strain value belongs to the prior art, does not belong to the protection scope of the embodiment of the application, and is not repeated herein. Finally, a channel steel shell is arranged outside the first end and the second end for protection, so that vibration separation and soil rock damage which can be generated in the piling process are prevented.
Step S33: and placing the wind power foundation pile 6 into the pile embracing device 1 for positioning.
Specifically, 2000t floating crane and 500t floating crane are used in a matched mode to place the wind power foundation pile 6 into the pile embracing device 1, wherein the 2000t floating crane is used for lifting the wind power foundation pile 6 to lift the upper end of the wind power foundation pile 6, the 500t floating crane serves as a tail sliding crane to lift the lower end of the wind power foundation pile 6, and damage caused by friction between the lower end of the wind power foundation pile 6 and a ship body is avoided. The wind power foundation pile 6 is straightened and placed into the pile gripper 1 by the 2000t floating crane and the 500t floating crane, and the arm is tightened so that the wind power foundation pile is positioned.
Step S40: and (5) putting the wind power foundation pile 6 into mud for positioning.
Specifically, the pile gripper 1 is controlled, the wind power foundation pile 6 automatically sinks into the mud due to self weight, and after the pile gripper is not moved, the wind power foundation pile 6 is driven into the seabed to a preset depth by using the pile hammer.
Step S50: and fixing a drilling machine on the wind power foundation pile 6, and enabling a drill bit 7 of the drilling machine to downwards penetrate through the wind power foundation pile 6.
Specifically, as shown in fig. 6, the drilling machine includes a main machine 4 and a drill bit 7, and the drilling machine is hoisted to the pile top of the wind power foundation pile 6 by using a floating crane, wherein the main machine 4 is fixed on the pile top of the wind power foundation pile 6, and the drill bit 7 penetrates downwards into the wind power foundation pile 6 and penetrates through the wind power foundation pile 6 along the axial direction. Be equipped with the pneumatic cylinder 5 that is used for fixing a plurality of symmetry setting on wind-powered electricity generation foundation pile 6 with host computer 4 on the 4 bases of host computer, pneumatic cylinder 5 sets up around wind-powered electricity generation foundation pile 6, and set up along the circumference interval of wind-powered electricity generation foundation pile 6, the radial flexible of wind-powered electricity generation foundation pile 6 can be followed to the piston rod of pneumatic cylinder 5, when the piston rod all extends to the outer wall of supporting tight wind-powered electricity generation foundation pile 6 to wind-powered electricity generation foundation pile 6 in the middle, 4 centering of host computer are locked on wind-powered electricity generation foundation pile 6, thereby firmly fix the rig on wind-powered electricity generation foundation pile 6.
Because this application embodiment is through fixing the rig on wind-powered electricity generation foundation pile 6, need not additionally to set up and embrace the pile frame, reduced the construction procedure, improved work efficiency. In addition, the drill bit 7 penetrates into the wind power foundation pile 6 downwards and penetrates through the wind power foundation pile 6 along the axial direction, the wind power foundation pile 6 serves as a pile casing of the drill bit, the pile casing does not need to be additionally arranged, construction procedures are reduced, and working efficiency is improved.
Step S60: filling slurry into the wind power foundation pile 6;
as shown in fig. 7, the step S60 specifically includes:
step S61: preparing slurry;
specifically, bentonite and water are added into the steel box according to the proportion guided by the brand of the bentonite, and air is compressed by an air compressor and stirred into slurry.
Step S62: and (4) evacuating the wind power foundation pile 6, and filling slurry into the wind power foundation pile 6.
The seawater in the wind power foundation pile 6 is pumped out by a mud pump, and then the mud is injected into the wind power foundation pile 6 to the working face of the drilling machine so as to submerge the drill bit 7. Specifically, the slurry has a certain viscosity, on one hand, the slurry has the functions of lubricating, cooling and protecting the drill bit 7; secondly, the mud can wrap drilled broken stones, gravels and the like and is pumped out of the wind power foundation pile 6 by a mud pump; in the third aspect, the slurry fills the gaps in the inner wall of the drilled hole, bonds the sand in the inner wall of the hole, and plays a role in protecting the wall, thereby preventing the wall of the hole from collapsing.
Step S70: and the drilling machine drills and sinks the pile in multiple times until the drilling machine drills to the final preset depth and sinks the pile in place.
The step S70 specifically includes:
s71: starting a drilling machine, starting a drill bit 7 to drill downwards, and simultaneously continuously filling slurry into the wind power foundation pile 6 while discharging slag by pumping the slurry with slag in the wind power foundation pile 6;
specifically, the discharged slag discharge amount is periodically checked, the discharged slag is sampled and checked, and once abnormity occurs, the drilling machine is immediately stopped and lifted (namely, the drilling machine is stopped, and the drilling machine is moved away from the wind power foundation pile 6 by adopting a floating crane) so as to prevent hole collapse and drill burying. The normal condition of slag discharge and slag discharge is judged by combining core data (provided by geological research institutions before construction) of a pile position, for example, when a strongly weathered rock stratum is drilled under a pile, special attention needs to be paid to the conditions of slag sampling, discharge and the like, the core data of the pile position is analyzed, the strongly weathered limestone is light gray, a rock body is broken, the shape of gravel is taken as a main part, the rock block is easily broken by hand, and if the difference between the slag discharge sampling and the discharge sampling is large, the rock block is broken to be abnormal. In addition, slurry with slag in the wind power foundation pile 6 is pumped out through a slurry pump.
It should be noted that, a cutter of phi 5.8m is used to drill holes in the pile to the designed depth as far as possible, rock strata with high strength are cut to the maximum extent, if drilling sticking, drilling jumping and the like occur, the cutter with the smallest diameter (phi 4.4m) is replaced to perform tentative drilling, and the diameter of the cutter is increased step by step until the pile bottom can be drilled smoothly.
S72: filtering the pumped slurry, then adding the filtered slurry into the wind power foundation pile 6 again for cyclic utilization, periodically checking the viscosity and density of the filtered slurry, directly adding the filtered slurry into the wind power foundation pile 6 again if the viscosity and density of the filtered slurry meet the requirements, and otherwise, adding the filtered slurry into the wind power foundation pile 6 after adjustment;
specifically, the extracted slurry is filtered and discharged, and then is recycled, so that the construction cost can be reduced. The filtered slurry is periodically tested for consistency and density to ensure that the slurry is effective, and bentonite is added for adjustment if the viscosity and density of the slurry deviate from a predetermined value, for example, if the viscosity or density is low.
The requirements of the viscosity and the density of the slurry used in the drilling and pore-forming process of the drilling machine are enhanced: the relative density of the stratum is 1.06-1.21, the viscosity is 16-20 s; the relative density of the easily collapsed stratum is 1.21-1.46, and the viscosity is 19-30 s; the relative density of the rock stratum is 1.11-1.16, and the viscosity is 21-36 s; the sand content is less than 8.1 percent, and the colloid content is more than or equal to 97 percent.
The viscosity and density requirements of the slurry used in the drilling and pore-forming process of the percussion drill are as follows: the relative density of the stratum is 1.11-1.21, the viscosity is 18.2 s; the relative density of the easily collapsed stratum is 1.21-1.42, and the viscosity is 23-31 s; the relative density of the rock stratum is 1.11-1.21, and the viscosity is 26-36 s; the sand content is less than 4.1 percent, and the colloid content is more than or equal to 96 percent.
S73: when the drill bit 7 drills to the corresponding single predetermined depth, whether the drill bit drills to the single predetermined depth is determined by checking the slag discharge, and if the drill bit 7 does not drill to the corresponding single predetermined depth, the steps S71-S73 are repeated until the drill bit drills to the single predetermined depth.
S74: the drill bit has been drilled to a single predetermined depth, the drill bit is raised, the drill is loosened and removed from the wind power foundation pile 6 with the floating crane, the wind power foundation pile 6 is driven into the drill hole with the pile driving hammer and the pile is sunk in place.
Specifically, before construction, the number of times of drilling in each time and the preset depth (which may be the same or different each time) in each time are planned according to specific geological conditions. In order to prevent the rock-socketed drilling machine from colliding with the wind power foundation pile 6 in the hoisting process, the whole-process video recording is carried out in the drilling process. In addition, a heavy hammer is required to be tapped during pile sinking, so that the stress monitoring of the pile body is enhanced, and the pile bottom is prevented from curling and deforming.
In addition, the bottom section of wind power foundation pile 6 is welded on the outer surface, and the joint formed by welding is located on the outer surface of the bottom section of wind power foundation pile 6, so that the pile sinking process has a soil breaking effect, the pile tip penetration depth can be effectively increased under the same hammering energy and penetration standard, and the anti-curling effect is achieved as much as possible.
After rock-socketed hole forming, the drill is required to be evacuated as fast as possible, and the re-driving and concrete pouring time is shortened so as to avoid collapse caused by instability due to overlong soaking time of a strong weathering layer at the bottom opening of the wind power foundation pile 6.
Pile sinking in place means that the wind power foundation pile 6 is driven into the bottom of the hole until the pile can not sink any more.
Step S80: and (4) evacuating the slurry in the wind power foundation pile 6, discharging slag, and pouring concrete into the wind power foundation pile 6.
The step S80 specifically includes:
step S81: pumping out the mud in the wind power foundation pile 6 and discharging slag by using a mud pump;
step S82: placing a grouting guide pipe in the wind power foundation pile 6, wherein the opening end of the grouting guide pipe extends to the top end of the wind power foundation pile and is provided with a one-way grouting valve, the outlet end extends to the bottom end of the wind power foundation pile, and a plurality of grout outlets are distributed in the grouting guide pipe along the length direction;
step S83: pouring concrete into the wind power foundation pile until the wind power foundation pile 6 is filled with the concrete;
specifically, in order to prevent the concrete from generating bubbles during pouring, the guide pipe with good sealing performance is adopted for pouring, the water leakage phenomenon is not easy to occur, the inner diameter of the guide pipe is 250mm, the guide pipe is formed by connecting guide pipe units in a sealing and splicing mode, the guide pipe units are formed by rolling steel plates with the thickness of 5mm, and the total length of the guide pipe is determined according to the actual hole depth before the concrete is poured.
Concrete is poured into the wind power foundation pile as follows:
the distance between the bottom opening of the guide pipe and the hole bottom is 30-50 cm, concrete is poured into the wind power foundation pile through the guide pipe, when the burial depth of the bottom end of the guide pipe in the concrete reaches 5m, the guide pipe is lifted upwards until the burial depth is not less than 1m, and then the concrete is continuously poured through the guide pipe; when the distance between the poured concrete and the pile top of the wind power foundation pile is 5m, pouring while vibrating, wherein the pouring height is not more than 1.5m each time; after confirming that the quality of the concrete at the pile top of the wind power foundation pile meets the requirement, lifting the last section of guide pipe; after the perfusion is finished, the mixture is vibrated for about 10min by a vibrating rod to prevent bubbles from generating.
Step S84: within 12-24 h after the concrete pouring is finished, opening the plug by using clear water to ensure that the grouting guide pipe is smooth, and the water pressure for opening the plug is not more than 8 MPa;
step S85: and injecting cement slurry into the grouting guide pipe, wherein the grouting pressure is preferably 1-4 Mpa, the grouting flow is 30-75L/min, the cement slurry flows into a gap between hardened concrete from a slurry outlet, and flows into a gap between the wind power foundation pile 6 and a seabed around the pile from a radial through hole of the wind power foundation pile 6, so that the high-strength wind power foundation pile 6 is formed, and a fan is convenient to install.
Specifically, concrete and the wind power foundation pile 6 are integrated, and cement paste is pressed into a gap in the concrete through a high-pressure grouting pump and a gap between the wind power foundation pile 6 and the seabed around the pile, so that the self strength and the installation strength of the wind power foundation pile 6 are further improved, and the bearing capacity of the wind power foundation pile 6 is improved. In addition, P.O42.5-grade ordinary portland cement is adopted, the water-cement ratio is 0.5-0.6, the stirring time is not less than 2min, and the slurry is filtered by a filter screen with the mesh size of 3mm multiplied by 3mm, so that the slurry is ensured to have good fluidity, and is not segregated or precipitated; the slurry adopts pure cement slurry to prevent impurities from blocking the grouting guide pipe.
It should be understood that the terms of orientation of up, down, left, right, front, back, top, bottom, etc., referred to or may be referred to in this specification, are defined relative to the configuration shown in the drawings, and are relative terms, and thus may be changed accordingly depending on the position and the use state of the device. Therefore, these and other directional terms should not be construed as limiting terms.
While the foregoing is directed to the preferred embodiment of the present application, and not to any one of the essential limitations or embodiments thereof, it is noted that various modifications and additions may be made by those skilled in the art without departing from the scope and spirit of the present application, which shall be deemed to fall within the broad scope and ambit of the invention as defined in the appended claims. Those skilled in the art can make various changes, modifications and equivalent arrangements to those skilled in the art without departing from the spirit and scope of the present application; moreover, any equivalent alterations, modifications and variations of the above-described embodiments according to the spirit and techniques of this application are intended to be within the scope of the claims of this application.
Claims (10)
1. A method for installing a wind power foundation pile is characterized by comprising the following steps:
step S10, pile positions of the wind power foundation piles are obtained;
step S20, based on the pile position, positioning the floating crane, the transport ship and the pile gripper;
step S30, fixing the pile gripper, and putting the wind power foundation pile into the pile gripper;
step S40, putting the wind power foundation pile into mud for positioning;
s50, fixing a main machine of a drilling machine on the wind power foundation pile, and enabling a drill bit of the drilling machine to penetrate through the wind power foundation pile downwards;
step S60, slurry is filled into the wind power foundation pile;
step S70, the drilling machine drills holes in several times and correspondingly sinks piles until the drilling reaches the final preset depth and the sinking piles are in place;
and step S80, pumping out mud and slag in the wind power foundation pile, and pouring concrete into the wind power foundation pile.
2. The method for installing a wind power foundation pile as claimed in claim 1, wherein the step S20 comprises:
step S21, determining the placement positions of the floating crane, the transport ship and the pile gripper on the transport ship based on the pile position;
and step S22, the floating crane, the transport ship and the pile gripper are located at the respective placement positions.
3. The method for installing the wind power foundation pile according to claim 3, wherein the step S30 specifically includes:
step S31, fixing the pile gripper;
step S32, preprocessing the wind power foundation pile: the lower half part of the wind power foundation pile is provided with a plurality of radial through hole rings at intervals along the axial direction of the wind power foundation pile, each radial through hole ring comprises a plurality of radial through holes arranged at intervals along the circumferential direction of the wind power foundation pile, and the radial through holes are communicated along the radial direction of the wind power foundation pile; at least two strain sensing optical cables are symmetrically distributed on the inner surface of the wind power foundation pile, and the strain sensing optical cables are used for measuring the stress value of the pile body;
and step S33, placing the wind power foundation pile into a pile embracing device and positioning.
4. The method for installing the wind power foundation pile according to claim 3, wherein in the step S31, the fixing pile clip is fixed by: driving the small piles on the pile gripper into the sludge by using a vibration hammer, so that the pile gripper is fixed on the seabed;
in the step S33, the wind power foundation pile is placed in the pile gripper in the following manner: the first floating crane and the second floating crane are used in a matched mode to place the wind power foundation pile into the pile gripper, wherein the first floating crane is used for lifting the wind power foundation pile to lift the upper end of the wind power foundation pile, and the second floating crane serves as a tail sliding crane to lift the lower end of the wind power foundation pile.
5. The method for installing the wind power foundation pile according to claim 4, wherein the step S40 specifically comprises: the wind power foundation pile automatically sinks into the mud due to dead weight, and the wind power foundation pile is driven into the seabed to the preset depth by using the pile driving hammer after the wind power foundation pile is not moved.
6. The method for installing the wind power foundation pile according to claim 5, wherein in the step S50, the main machine of the drilling machine is fixed on the wind power foundation pile by the following means: be equipped with the pneumatic cylinder that is used for fixing a plurality of symmetry setting on wind-powered electricity generation foundation pile with the host computer on the host computer base, the pneumatic cylinder setting is around wind-powered electricity generation foundation pile to set up along the circumference interval of wind-powered electricity generation foundation pile, the piston rod of pneumatic cylinder can be followed wind-powered electricity generation foundation pile and radially stretched out and drawn back, when the piston rod all extends to the outer wall of supporting tight wind-powered electricity generation foundation pile to wind-powered electricity generation foundation pile in the middle, the host computer centering and locking are on wind-powered electricity generation foundation pile, thereby firmly fix the rig on wind-powered electricity generation foundation pile.
7. The method for installing the wind power foundation pile according to claim 6, wherein the step S60 comprises:
step S61: preparing slurry;
step S62: and evacuating the wind power foundation pile, and filling slurry into the wind power foundation pile to the working surface of the drilling machine so as to submerge the drill bit.
8. The method for installing the wind power foundation pile according to claim 7, wherein the step S70 specifically includes:
s71: starting a drilling machine, starting a drill bit to drill downwards, and simultaneously continuously filling slurry into the wind power foundation pile while discharging slag by pumping the slurry with slag in the wind power foundation pile;
s72: filtering the pumped slurry, then adding the filtered slurry into the wind power foundation pile again for cyclic utilization, periodically checking the viscosity and density of the filtered slurry, directly adding the filtered slurry into the wind power foundation pile again if the viscosity and density of the filtered slurry meet the requirements, and otherwise, adding the filtered slurry into the wind power foundation pile after adjustment;
s73: when the drill bit drills to the corresponding single preset depth, whether the drill bit drills to the single preset depth is determined through checking slag discharge, if the drill bit does not drill to the corresponding single preset depth, the steps S71-S73 are repeated until the drill bit drills to the single preset depth;
s74: the drill bit is drilled to a single preset depth, the drill bit is lifted, the drill is loosened, the drill is moved away from the wind power foundation pile through the floating crane, the wind power foundation pile is driven into the drill hole through the pile driving hammer, and pile sinking is in place.
9. The method for installing the wind power foundation pile according to claim 8, wherein the step S80 specifically includes:
step S81, pumping out mud in the wind power foundation pile and discharging slag;
step S82, placing a grouting guide pipe in the wind power foundation pile, wherein the opening end of the grouting guide pipe extends to the top end of the wind power foundation pile, the outlet end of the grouting guide pipe extends to the bottom end of the wind power foundation pile, and a plurality of grout outlets are distributed in the grouting guide pipe along the length direction;
step S83, pouring concrete into the wind power foundation pile until the wind power foundation pile is filled with the concrete;
step S84, after concrete pouring is finished, using clear water to open the plug, so that the grouting guide pipe is smooth;
and step S85, cement slurry is injected into the grouting guide pipe, and flows into gaps among hardened concrete from the slurry outlet, so that a high-strength wind power foundation pile is formed, and a fan is convenient to install.
10. The method for installing the wind power foundation pile according to claim 9, wherein the step S83 specifically includes:
pouring concrete into the wind power foundation pile by adopting a guide pipe, pouring the concrete into the wind power foundation pile by the guide pipe, wherein the distance between a bottom opening of the guide pipe and the bottom of a hole is 30-50 cm, and when the burial depth of the bottom end of the guide pipe in the concrete reaches 5-10 m, lifting the guide pipe upwards until the burial depth is not less than 1m, and then continuously pouring the concrete through the guide pipe;
when the distance between the poured concrete and the pile top of the wind power foundation pile is 5m, pouring while vibrating, wherein the pouring height is not more than 1.5m each time;
after the perfusion is finished, the mixture is vibrated for about 10min to prevent bubbles.
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