CN111945773A - Pile box barrel composite foundation for offshore wind power and construction method thereof - Google Patents
Pile box barrel composite foundation for offshore wind power and construction method thereof Download PDFInfo
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- CN111945773A CN111945773A CN202010879369.XA CN202010879369A CN111945773A CN 111945773 A CN111945773 A CN 111945773A CN 202010879369 A CN202010879369 A CN 202010879369A CN 111945773 A CN111945773 A CN 111945773A
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- 238000010276 construction Methods 0.000 title claims abstract description 37
- 239000002131 composite material Substances 0.000 title claims abstract description 32
- 239000002689 soil Substances 0.000 claims abstract description 24
- 238000005192 partition Methods 0.000 claims abstract description 15
- 238000007789 sealing Methods 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 48
- 238000005086 pumping Methods 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 12
- 239000011440 grout Substances 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 5
- 239000002344 surface layer Substances 0.000 claims description 5
- 239000011083 cement mortar Substances 0.000 claims description 4
- 239000004567 concrete Substances 0.000 claims description 4
- 239000004570 mortar (masonry) Substances 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 238000009991 scouring Methods 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims 1
- 239000002893 slag Substances 0.000 claims 1
- 238000009933 burial Methods 0.000 abstract description 5
- 239000010410 layer Substances 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 239000004927 clay Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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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
- E02D27/42—Foundations for poles, masts or chimneys
- E02D27/425—Foundations for poles, masts or chimneys specially adapted for wind motors masts
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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
- E02D27/10—Deep foundations
- E02D27/20—Caisson foundations combined with pile foundations
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Abstract
The invention discloses a pile-box-barrel composite foundation for offshore wind power, which comprises a single pile and a barrel body; the barrel body comprises an inner barrel body, an outer barrel body, a negative pressure barrel top plate and a plurality of negative pressure barrel partition plates, the inner barrel body is coaxially arranged in the inner cavity of the outer barrel body and sleeved on the single pile, and the inner barrel body and the single pile are connected into a whole through grouting; the negative pressure barrel top plate is covered between the upper parts of the inner barrel body and the outer barrel body in a sealing manner, so that a negative pressure barrel is formed at the lower part of the negative pressure barrel top plate, an open box barrel is reserved above the negative pressure barrel top plate, and the inside of the open box barrel is divided into a plurality of weight areas through a plurality of rib plates; the negative pressure barrel partition plates are radially and uniformly connected in the negative pressure barrel to divide the negative pressure barrel into a plurality of negative pressure cabins; after the barrel body is penetrated with seabed soil and the top plate of the negative pressure barrel reaches the designed elevation, riprap ballast weights are filled in each ballast area of the open box barrel to form a box-shaped foundation. The invention also discloses a construction method of the pile box barrel composite foundation of offshore wind power. The invention can improve the anti-overturning bearing capacity and reduce the single pile burial depth.
Description
Technical Field
The invention relates to a pile box barrel composite foundation for offshore wind power and a construction method thereof.
Background
The population and the industry of developed coastal areas are centralized, and the offshore wind power development conforms to the sustainable development concept of energy resource local utilization. The manufacturing cost of the foundation part of the offshore wind power can reach 15% -25% of the total manufacturing cost, and for the offshore wind power within 35m of water depth, the large-diameter steel pipe pile is considered to be one of the most suitable offshore wind power foundation types.
The design of a large-diameter single pile foundation of offshore wind power needs to meet the requirements of deformation and frequency, so that the pile foundation is required to have a certain burial depth. For the stratum with shallow buried depth of the rock stratum, the depth of the rock embedding section of the pile foundation is large. The pile foundation rock-socketed construction process is complex, a drilling-drilling process is possibly adopted, and great inconvenience is brought to offshore construction with a short window period. In addition, pile bottom stress has the turn-up risk for 2 times of the pile driving stress that spreads into, also has because the phenomenon that actual soil layer and reconnaissance difference arouse the pile foundation superheight. At present, after a construction party generally finds that a single pile cannot be driven to an elevation, a special processing scheme is customized, so that the efficiency is low, and the construction period is seriously influenced. Therefore, it is necessary to develop a composite foundation form on the basis of a single-pile foundation structure, and when a single pile cannot reach a designed elevation, the change processing can be performed in time, so that the efficiency is improved, and the cost is reduced. Although negative pressure barrel foundation structures exist at present, the penetration depth of the negative pressure barrel foundation is still limited by geological conditions. When a hard soil layer exists at the lower part of the seabed or the mud surface has large fluctuation, the negative pressure barrel foundation may not reach the designed elevation.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a pile-box-barrel composite foundation for offshore wind power and a construction method thereof, which can improve the anti-overturning bearing capacity of the foundation, reduce the single-pile burial depth and improve the construction efficiency.
One technical scheme for achieving the purpose of the invention is as follows: a pile-box-barrel composite foundation for offshore wind power comprises a single pile and a barrel body; the barrel body comprises an inner barrel body, an outer barrel body, a negative pressure barrel top plate and a plurality of negative pressure barrel partition plates, wherein the inner barrel body is coaxially arranged in the inner cavity of the outer barrel body and sleeved on the single pile; wherein the content of the first and second substances,
the negative pressure barrel top plate is covered between the upper part of the inner barrel body and the upper part of the outer barrel body in a sealing manner, so that the negative pressure barrel is formed at the lower part of the negative pressure barrel top plate, an open box barrel is reserved above the negative pressure barrel top plate, a plurality of rib plates are radially and uniformly connected between the inner barrel body and the outer barrel body in the open box barrel, and the open box barrel is divided into a plurality of weight pressing areas;
the height of the negative pressure barrel partition plates is the same as that of the negative pressure barrel, the negative pressure barrel partition plates are radially and uniformly connected between the inner barrel body and the outer barrel body in the negative pressure barrel, the top surfaces of the negative pressure barrel partition plates are fixed on the bottom surface of the negative pressure barrel top plate, and the negative pressure barrel is divided into a plurality of negative pressure chambers;
after the barrel body is penetrated with seabed soil and the top plate of the negative pressure barrel reaches a designed elevation, filling riprap ballast in each ballast area of the open box barrel to form a box-shaped foundation;
the inner diameter of the inner barrel body is larger than the outer diameter of the single pile, grouting is conducted in a gap between the inner barrel body and the single pile, the barrel body and the single pile are connected into a whole, and a sealing top plate is installed between the top of the inner barrel body and the single pile after grouting is completed.
According to the pile box barrel composite foundation for offshore wind power, the inner wall of the inner barrel body is uniformly provided with the guide pulleys in rows.
In the pile box barrel composite foundation for offshore wind power, a water pumping hole, a grouting hole and a grout overflowing hole are arranged on the top plate of the negative pressure barrel corresponding to each negative pressure cabin; and a hydraulic valve is arranged on the water pumping hole.
The other technical scheme for realizing the purpose of the invention is as follows: a construction process of a pile box barrel composite foundation of offshore wind power comprises the following steps:
firstly, pile driving equipment is put in place, and a prefabricated single pile is driven into seabed soil to a preset height;
hoisting the barrel body to a position where the elevation of the bottom of the barrel body exceeds the elevation of the pile top of the single pile through hoisting equipment, adjusting the plane position of the barrel body to enable the axis of the barrel body to be basically superposed with the axis of the single pile, slowly lowering the barrel body through the hoisting equipment, and enabling the barrel body to be sleeved on the single pile through a guide pulley on the inner barrel body;
thirdly, slowly lowering the barrel body by adjusting the tension of the hoisting equipment to enable the barrel body to be filled with water, opening a hydraulic valve on a water pumping hole to drain water, wherein the water pumping hole is also used as a water drainage hole until the bottom of the barrel body contacts with the mud surface of the seabed, the barrel body penetrates through the surface layer of the foundation by means of the gravity of the barrel body, and at the moment, a closed space is formed in the negative pressure barrel;
step four, closing a hydraulic valve, connecting all water pumping holes with a water pumping pipeline with a water pump, pumping gas and water in each negative pressure chamber from the water pumping holes through the water pump, and further penetrating the barrel body into the soil by utilizing the pressure difference between the inside and the outside of the negative pressure barrel until the barrel body sinks to the designed elevation;
after the barrel body is sunk in place, grouting in the barrel is firstly carried out between the negative pressure barrel top plate and the soil body in each negative pressure chamber, and then grouting between piles and barrels is carried out in a gap between the inner barrel body and a single pile;
and step six, filling the weight of the riprap in each weight area of the open box barrel on the upper part of the top plate of the negative pressure barrel by using a riprap boat.
According to the construction process of the pile-box-barrel composite foundation of offshore wind power, during the second step, underwater scanning operation is performed on the sea bed surface around the single pile in advance, if scouring pits or gravel residues exist around the single pile, corresponding treatment is performed, and the sea bed surface in the barrel construction influence area range is at least ensured to be flat.
The construction process of the pile box bucket composite foundation of the offshore wind power comprises the step four, the inclination of the top plate of the negative pressure bucket is continuously monitored by the aid of the positioning and monitoring system, air suction sinking amount of each negative pressure cabin in the negative pressure bucket is adjusted, and levelness of the top plate of the negative pressure bucket is guaranteed until the bucket body sinks to reach a designed elevation.
The construction process of the pile box barrel composite foundation of offshore wind power comprises the following steps of (1) opening a grouting hole in a negative pressure barrel top plate when barrel grouting filling and filling are carried out in the step five, injecting cement mortar from the grouting hole through a grouting pipe, and judging the grouting completion condition through a grout overflow hole; when grouting between pile barrels, firstly, cleaning soil in a gap between a single pile and an inner barrel body within a set range below the top of the barrel body by using a high-pressure water gun, and sucking mud by using an air compressor and the high-pressure water gun; then inserting a rigid grouting pipe into a gap between the single pile and the inner barrel body from the top of the barrel body, and then injecting fine aggregate concrete mortar; the height of the grouting surface needs to reach the top of the barrel body, and the installation of the top sealing plate is immediately carried out after grouting is finished.
The pile box barrel composite foundation of offshore wind power and the construction method thereof have the following characteristics: the upper part of the barrel body is divided into a negative pressure barrel at the lower part and an open box barrel at the upper part through a negative pressure barrel top plate, and after the barrel body sinks to seabed soil, a riprap ballast is arranged in the open box barrel to enable the barrel body to form a box-barrel composite foundation, the barrel body is connected with a single pile into a whole through grouting between the inner barrel body and the single pile, so that a pile-box-barrel composite foundation is further formed, the anti-overturning bearing capacity of the gravity type foundation is fully utilized, the lateral rigidity of the single pile can be improved, the burial depth of the single pile can be reduced, the construction of the barrel body can be finished within 1-2 days for a foundation with clay and other soft soil layers on the surface layer of a seabed, the subsequent ballast laying period is short, the operation window period is short, the marine construction with expensive equipment renting cost is obvious in. The pile-box bucket composite foundation also provides a treatment scheme for the working condition that the construction of a single-pile rock-socketed section is difficult, and also provides a selection scheme of a novel offshore wind power foundation structure.
Drawings
FIG. 1 is a schematic structural diagram of a pile-box-bucket composite foundation for offshore wind power of the present invention;
FIG. 2 is a view taken along line A-A of FIG. 1;
FIG. 3 is a view from the B-B direction in FIG. 1;
FIG. 4 is a flow chart of the construction method of the pile-box-bucket composite foundation of offshore wind power of the present invention;
FIG. 5 is a schematic structural diagram of the construction method of the present invention in step one;
FIG. 6 is a schematic structural view of the construction method of the present invention in the case of performing step two;
FIG. 7 is a schematic structural view of the construction method of the present invention in the case of performing step three;
FIG. 8 is a schematic structural view of the construction method of the present invention in the case of performing step four;
FIG. 9 is a schematic structural view of the construction method of the present invention in the case of performing step five;
FIG. 10 is a schematic view of the construction method of the present invention in a sixth step.
Detailed Description
The invention will be further explained with reference to the drawings.
Referring to fig. 1 to 3, the pile-box-barrel composite foundation for offshore wind power of the present invention includes a single pile 1 and a barrel body 2; wherein the content of the first and second substances,
the single pile 1 is driven into seabed soil and has the capability of resisting vertical load;
the barrel body 2 comprises an inner barrel body 21, an outer barrel body 22, eight negative pressure barrel partition plates 23 and a negative pressure barrel top plate 24;
the inner diameter of the inner barrel body 21 is larger than the outer diameter of the single pile 1; the inner barrel body 21 is coaxially arranged in the inner cavity of the outer barrel body 22; the barrel body 2 is sleeved on the single pile 1 through the inner barrel body 21; the inner wall of the inner barrel body 21 is also uniformly provided with a plurality of rows of guide pulleys 3, the inner diameter formed by the rims of the plurality of rows of guide pulleys 3 is matched with the outer diameter of the single pile 1, the guide pulleys are used for guiding the coaxiality when the barrel body 2 is sleeved on the single pile 1, and the influence of the installation process of the barrel body 2 on the single pile 1 after pile sinking construction can be reduced; grouting 4 in a gap between the inner barrel body 21 and the single pile 1 to enable the barrel body 2 and the single pile 1 to be connected into a whole, and installing an annular top sealing plate 5 with the width matched with the gap between the inner barrel body 21 and the single pile 1 between the top of the inner barrel body 21 and the single pile 1 after grouting 4;
the negative pressure barrel top plate 24 is sealed between the upper part of the inner barrel body 21 and the upper part of the outer barrel body 22, so that the negative pressure barrel 2A is formed at the lower part of the negative pressure barrel top plate 24, and an open box barrel 2B is reserved above the negative pressure barrel top plate 24; four rib plates 26 are radially and uniformly connected between the inner barrel body 21 and the outer barrel body 22 in the open box barrel 2B, so that the open box barrel 2B is divided into four weight areas;
the eight negative pressure barrel partition plates 23 are as high as the negative pressure barrel 2A, the eight negative pressure barrel partition plates 23 are radially and uniformly connected between the inner barrel body 21 and the outer barrel body 22 in the negative pressure barrel 2A, and the top surfaces of the eight negative pressure barrel partition plates are fixed on the bottom surface of the top plate of the negative pressure barrel, so that the inside of the negative pressure barrel 2A is divided into eight negative pressure chambers;
the eight negative pressure barrel partition plates 23 and the four rib plates 26 can effectively enhance the connection stability of the inner barrel body 21 and the outer barrel body 22 and can also enhance the connection stability of the barrel body 2 and the single pile 1;
a water pumping hole capable of forming negative pressure in each negative pressure cabin is arranged on the top plate 24 of the negative pressure barrel corresponding to each negative pressure cabin, and a hydraulic valve is arranged on each water pumping hole and is also used as a water drainage hole; the top plate 24 of the negative pressure barrel is also provided with a grouting hole and a grout overflow hole corresponding to each negative pressure cabin;
after the barrel body 2 is penetrated with seabed soil and the top plate 24 of the negative pressure barrel reaches the designed elevation, the four ballast areas of the open box barrel 2B are filled with the riprap 20 for ballast to form a box-shaped foundation, so that the capability of the foundation for bearing the overturning bending moment can be improved.
According to the pile-box-barrel composite foundation for offshore wind power, the upper part of the barrel body is divided into the negative pressure barrel at the lower part and the open box barrel at the upper part through the negative pressure barrel top plate, and after the barrel body is penetrated into seabed soil, a riprap ballast is placed in the open box barrel, so that the barrel body forms the box-barrel composite foundation; the barrel body is connected with the single pile through grouting to form a whole through the inner barrel body, a pile box barrel composite foundation is further formed, the anti-overturning bearing capacity of the gravity type foundation is fully utilized, the lateral rigidity of the single pile can be improved, the burial depth of the single pile can be reduced, clay and other soft soil layer foundations exist on the surface layer of a seabed, barrel body construction can be completed within 1-2 days, the follow-up weight-pressing stone throwing period is short, the operation window period is short, equipment renting cost is high, benefits are remarkable, and construction efficiency is high.
Referring to fig. 4 to 10, the construction process of the pile-box-bucket composite foundation of offshore wind power of the present invention includes the following steps:
firstly, pile driving equipment is put in place, and a prefabricated single pile 1 is driven into seabed soil to a preset height;
firstly, performing underwater scanning operation on the sea bed surface around the single pile, and if scouring pits or gravel residues exist around the single pile, performing corresponding treatment to at least ensure that the sea bed surface is flat within the range of the construction influence area of the barrel body, preferably ensure that the sea bed surface is flat within the range of 50m around the single pile, ensure that the barrel body 2 can form initial sealing after self weight penetrates into the soil body, and prevent the outer barrel body 22 wall from leaking water and being incapable of forming negative pressure after initial pumping; hoisting the barrel body 2 by using hoisting equipment until the elevation of the bottom of the barrel body exceeds the elevation of the pile top of the single pile 1, adjusting the plane position of the barrel body 2 to ensure that the axis of the barrel body 2 is basically superposed with the axis of the single pile 1, and slowly lowering the barrel body 2 by using the hoisting equipment to ensure that the barrel body 2 is sleeved on the single pile 1 through the guide pulley 3 on the inner barrel body 21;
thirdly, slowly lowering the barrel body 2 by adjusting the tension of the hoisting equipment to enable the barrel body 2 to enter water, opening a hydraulic valve on a water pumping hole to drain water, wherein the water pumping hole is also used as a drain hole until the bottom of the barrel body 2 contacts the seabed mud surface, the barrel body 2 penetrates through the surface layer of the foundation by virtue of self gravity, and at the moment, a closed space is formed in the negative pressure barrel 2A;
step four, closing a hydraulic valve, connecting all water pumping holes with a water pumping pipeline with a water pump, pumping gas and water in each negative pressure chamber from the water pumping holes through the water pump, and further penetrating the barrel body 2 into the soil by utilizing the pressure difference between the inside and the outside of the negative pressure barrel 2A until the barrel body 2 sinks to the designed elevation; in the sinking process of the barrel body 2, the inclination of the top plate 24 of the negative pressure barrel is continuously monitored by a positioning monitoring system, the pumping (gas) sinking amount of each negative pressure cabin in the negative pressure barrel 2A is adjusted, and the levelness of the top plate 24 of the negative pressure barrel is ensured;
after the barrel body 2 is sunk in place, grouting and filling in the barrel are firstly carried out between the negative pressure barrel top plate 24 and soil bodies pressed into each negative pressure chamber from the bottom of the barrel body 2, and then pile-barrel grouting is carried out in a gap between the inner barrel body 21 and the single pile 1;
when the barrel is filled with grouting, the grouting hole in the top plate 24 of the negative pressure barrel is opened, cement mortar is injected from the grouting hole through the grouting pipe, and the grouting completion condition is judged through the grout overflow hole; observing the material state of the slurry overflow hole, stopping grouting when seawater and muddy water are sequentially overflowed and finally forming stable slurry to be overflowed, and sealing the slurry overflow hole;
when grouting between piles and barrels, firstly, removing soil in a gap between a single pile 1 and an inner barrel body 21 in a set range below the top of the barrel body 2 by using a high-pressure water gun, and sucking mud by using an air compressor and the high-pressure water gun; then inserting a rigid grouting pipe into a gap between the single pile 1 and the inner barrel body 21 from the top of the barrel body 2, and then injecting fine aggregate concrete mortar; the height of the grouting surface needs to reach the top of the barrel body 2, and the installation of the top sealing plate 5 is immediately carried out after grouting is finished.
Grouting materials adopted by the two grouting filling positions have the characteristics of high hardness, early strength and segregation prevention; the cement mortar used for injecting and filling the slurry in the barrel is M15 or above; the fine stone concrete mortar adopted for grouting among the pile barrels is C40 or above.
And step six, filling the four ballast areas of the open box barrel 2B at the upper part of the negative pressure barrel top plate 24 with the ballast throwing boat to complete construction operation.
The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and therefore all equivalent technical solutions should also fall within the scope of the present invention, and should be defined by the claims.
Claims (7)
1. A pile-box-barrel composite foundation for offshore wind power comprises a single pile and a barrel body; the barrel body comprises an inner barrel body, an outer barrel body, a negative pressure barrel top plate and a plurality of negative pressure barrel partition plates, wherein the inner barrel body is coaxially arranged in the inner cavity of the outer barrel body and sleeved on the single pile; it is characterized in that the preparation method is characterized in that,
the negative pressure barrel top plate is covered between the upper part of the inner barrel body and the upper part of the outer barrel body in a sealing manner, so that the negative pressure barrel is formed at the lower part of the negative pressure barrel top plate, an open box barrel is reserved above the negative pressure barrel top plate, a plurality of rib plates are radially and uniformly connected between the inner barrel body and the outer barrel body in the open box barrel, and the open box barrel is divided into a plurality of weight pressing areas;
the height of the negative pressure barrel partition plates is the same as that of the negative pressure barrel, the negative pressure barrel partition plates are radially and uniformly connected between the inner barrel body and the outer barrel body in the negative pressure barrel, the top surfaces of the negative pressure barrel partition plates are fixed on the bottom surface of the negative pressure barrel top plate, and the negative pressure barrel is divided into a plurality of negative pressure chambers;
after the barrel body is penetrated with seabed soil and the top plate of the negative pressure barrel reaches a designed elevation, filling riprap ballast in each ballast area of the open box barrel to form a box-shaped foundation;
the inner diameter of the inner barrel body is larger than the outer diameter of the single pile, grouting is conducted in a gap between the inner barrel body and the single pile, the barrel body and the single pile are connected into a whole, and a sealing top plate is installed between the top of the inner barrel body and the single pile after grouting is completed.
2. The pile-box-bucket composite foundation of offshore wind power of claim 1, wherein a plurality of rows of guide pulleys are uniformly distributed and mounted on the inner wall of the inner bucket body.
3. The pile-box-bucket composite foundation of offshore wind power of claim 1, wherein a water pumping hole, a grouting hole and a grout overflowing hole are arranged on the top plate of the negative pressure bucket corresponding to each negative pressure cabin; and a hydraulic valve is arranged on the water pumping hole.
4. The construction process of the pile box barrel composite foundation of offshore wind power is characterized by comprising the following steps:
firstly, pile driving equipment is put in place, and a prefabricated single pile is driven into seabed soil to a preset height;
hoisting the barrel body to a position where the elevation of the bottom of the barrel body exceeds the elevation of the pile top of the single pile through hoisting equipment, adjusting the plane position of the barrel body to enable the axis of the barrel body to be basically superposed with the axis of the single pile, slowly lowering the barrel body through the hoisting equipment, and enabling the barrel body to be sleeved on the single pile through a guide pulley on the inner barrel body;
thirdly, slowly lowering the barrel body by adjusting the tension of the hoisting equipment to enable the barrel body to be filled with water, opening a hydraulic valve on a water pumping hole to drain water, wherein the water pumping hole is also used as a water drainage hole until the bottom of the barrel body contacts with the mud surface of the seabed, the barrel body penetrates through the surface layer of the foundation by means of the gravity of the barrel body, and at the moment, a closed space is formed in the negative pressure barrel;
step four, closing a hydraulic valve, connecting all water pumping holes with a water pumping pipeline with a water pump, pumping gas and water in each negative pressure chamber from the water pumping holes through the water pump, and further penetrating the barrel body into the soil by utilizing the pressure difference between the inside and the outside of the negative pressure barrel until the barrel body sinks to the designed elevation;
after the barrel body is sunk in place, grouting in the barrel is firstly carried out between the negative pressure barrel top plate and the soil body in each negative pressure chamber, and then grouting between piles and barrels is carried out in a gap between the inner barrel body and a single pile;
and step six, filling the weight of the riprap in each weight area of the open box barrel on the upper part of the top plate of the negative pressure barrel by using a riprap boat.
5. The construction process of the pile-box-bucket composite foundation of offshore wind power as claimed in claim 4, wherein in the second step, underwater scanning operation is performed on the sea bed surface around the single pile in advance, and if scouring pits or gravel slag exist around the single pile, corresponding treatment is performed, so that the sea bed surface in the range of the construction affected area of the bucket body is at least ensured to be flat.
6. The construction process of the pile-box-bucket composite foundation of offshore wind power as claimed in claim 4, wherein in the fourth step, the inclination of the top plate of the negative pressure bucket is continuously monitored by means of a positioning monitoring system, the air suction sinking amount of each negative pressure cabin in the negative pressure bucket is adjusted, and the levelness of the top plate of the negative pressure bucket is ensured until the bucket body sinks to the designed elevation.
7. The construction process of the pile box barrel composite foundation of offshore wind power as claimed in claim 4, wherein when filling of grouting into the barrel in the fifth step, a grouting hole on the top plate of the negative pressure barrel is opened, cement mortar is injected from the grouting hole through a grouting pipe, and the completion condition of grouting is judged through a grout overflow hole; when grouting between pile barrels, firstly, cleaning soil in a gap between a single pile and an inner barrel body within a set range below the top of the barrel body by using a high-pressure water gun, and sucking mud by using an air compressor and the high-pressure water gun; then inserting a rigid grouting pipe into a gap between the single pile and the inner barrel body from the top of the barrel body, and then injecting fine aggregate concrete mortar; the height of the grouting surface needs to reach the top of the barrel body, and the installation of the top sealing plate is immediately carried out after grouting is finished.
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| CN112523247A (en) * | 2020-12-10 | 2021-03-19 | 浙江大学 | Method for improving horizontal bearing capacity of pile foundation by using pile periphery steel-crushed gravel barrel structure |
| CN112627225A (en) * | 2020-12-25 | 2021-04-09 | 中国长江三峡集团有限公司 | Composite foundation structure of offshore wind power single pile, supporting disc and small suction bucket and construction method thereof |
| CN113089573A (en) * | 2021-04-16 | 2021-07-09 | 浙江省海洋科学院(浙江省海洋技术服务中心) | Sea-surrounding dam construction method |
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| CN113774896A (en) * | 2021-10-11 | 2021-12-10 | 水利部交通运输部国家能源局南京水利科学研究院 | Top precession type grouting anti-scouring device and method for offshore wind power barrel type foundation |
| CN113774896B (en) * | 2021-10-11 | 2022-04-19 | 水利部交通运输部国家能源局南京水利科学研究院 | Top precession type grouting anti-scouring device and method for offshore wind power barrel type foundation |
| CN114164854A (en) * | 2022-02-14 | 2022-03-11 | 中国长江三峡集团有限公司 | Composite cylinder structure |
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