CN110144924A - A conical cylindrical offshore wind turbine foundation structure and its construction method - Google Patents

Abstract

The invention belongs to hydraulic structure fields, a kind of taper barrel marine wind turbine generator system base structure is specifically disclosed, taper barrel concrete heavy mail including basis and placement on it, the taper barrel concrete heavy mail includes Upper cylindrical end and lower cone end, the upper end diameter at the lower cone end is consistent with the diameter of upper end cylindrical end, and what the inside at the lower cone end was successively layered from bottom to up is filled with underwater self-compaction concrete and Cast-in-situ Piles in Sand-filling.The taper barrel concrete heavy mail structure can be integral prefabricated by land, transportation by driving fills underwater self-compaction concrete and Cast-in-situ Piles in Sand-filling rear stability is good, structure is simple and construction vertical precision is high to live energy Fast Installation, reduce the offshore construction activity duration, peripheral region environment is influenced small.

Description

A conical cylindrical offshore wind turbine foundation structure and its construction method

technical field

The invention belongs to the field of hydraulic structures, and in particular relates to a gravity foundation of a prefabricated concrete component of a conical cylindrical offshore wind power generating set and a construction method thereof.

Background technique

In the prior art, at present, there are many types of foundations for offshore wind turbines, but they can be summarized into the following three types: floating foundations, pile foundations, and gravity foundations. For the above three types of pile foundations, the following are detailed descriptions:

The first type, the floating foundation, is suitable for sea areas with extremely large water depths. The offshore wind turbine is installed on the foundation of the cavity structure and floats in the water. The buoyancy supports the weight of the entire foundation and the offshore wind turbine. Due to the swaying of the foundation due to the action of wind and waves, compared with other fixed foundations, the floating foundation is more unstable, which is not conducive to the operation of offshore wind turbines. The relevant technical conditions are not yet mature, and it is still in the prototype test stage.

The second type, pile foundation can be divided into single pile foundation, multi-pile cap foundation, jacket foundation and so on. The pile foundation relies on the piles driven into the soil to provide bearing capacity to support the weight of the offshore wind turbine and the stability during operation. It is suitable for construction sites with thicker soil cover and better soil quality. However, my country's coastal geological bedrock is developed, and the bedrock surface is buried shallow in many places, so it is not suitable for driven pile foundations. At present, rock-socketed pile foundations are generally used, which has a long construction period, high construction risks, and high cost.

The third type, the gravity foundation, is suitable for good geological conditions, especially suitable for wind farms with shallow bedrock surface burial depth, but wind power generation units have high requirements on the verticality of the tower tube, which is not more than three thousandths. Because the conventional gravity foundation installation method cannot meet the verticality requirements of the foundation, and there may be uneven settlement after completion, the gravity foundation has not been widely used in the field of offshore wind power.

Therefore, it is imminent to develop a conical cylindrical offshore wind turbine foundation and its construction method that can be prefabricated on land, reduce offshore construction time, quickly install on site, have little impact on the surrounding environment, have a simple structure, and have high vertical construction accuracy.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art, and specifically disclose the foundation structure of the conical cylindrical offshore wind power generation unit. The main structure of the foundation can be prefabricated on land to reduce the construction time at sea, and can be quickly installed on site, which has no impact on the environment of the surrounding area. Small, good stability after filling with underwater self-compacting concrete and backfilling sand, simple structure and high vertical precision of construction.

In order to achieve the above-mentioned technical purpose, the present invention is realized according to the following technical solutions:

The basic structure of the conical cylindrical offshore wind power generating set according to the present invention includes a foundation and a conical cylindrical concrete heavy part placed thereon, the conical cylindrical concrete heavy part includes an upper cylindrical end and a lower conical end, the The diameter of the upper end of the lower conical end is consistent with the diameter of the upper cylindrical end, and the interior of the lower conical end is filled with underwater self-compacting concrete and backfill sand in layers from bottom to top. The diameter of the upper cylindrical end is determined according to the diameter of the flange of the offshore wind turbine tower, the elevation of the upper cylindrical end is determined according to the high water level of the site and the wave height, so as to ensure that the top is not affected by waves, and the diameter of the lower conical end is determined according to the bearing capacity of the foundation It is determined that the larger the diameter, the smaller the stress on the foundation, and the height of the lower conical end is determined by the weight requirements of the foundation of the offshore wind turbine. The greater the weight requirement, the higher the lower conical end.

As a further improvement of the above technology, the upper cylindrical end and the lower conical end are provided with prestressed anchor holes, and the anchor cable passes through the outer wall of the upper cylindrical end and the outer wall of the lower conical end in sequence from the upper anchoring end of the upper cylindrical end to reach the bottom At the anchoring end, the anchor cable is anchored to the upper anchoring end and the bottom anchoring end after applying a certain pretension, and the anchor hole is filled with cement slurry by high-pressure pouring, so that the anchor cable and the anchor hole wall are tightly bonded.

As a further improvement of the above technology, the top of the upper cylindrical end is installed with a flange for connecting the tower of the offshore wind turbine, and an external expansion platform for installing the tower and operating and maintaining the operation. The top of the upper cylindrical end is set The inner wall thickness is expanded inward at the appropriate position to form the upper anchor end for pre-embedded flange anchor bolts and prestressed anchor cables. The diameter of the upper cylindrical end is the same as the flange diameter of the offshore wind turbine tower. adapt.

As a further improvement of the above technology, a rubber fender for berthing is installed on the outside of the upper cylindrical end, and a pedestrian ladder for operators to go up and down is installed above the rubber fender for berthing, and the ladder passes through the outer expansion platform. The location sets the platform manhole. Personnel can go through the manhole of the outer expansion platform and climb to the outer expansion platform for operation.

As a further improvement of the above-mentioned technology, the inside of the lower conical end is provided with a compartment floor, which divides the interior of the lower conical end into an upper cabin and a lower cabin, and the lower cabin is provided with a uniform radiating from the center of the circle. A plurality of lower compartment longitudinal partitions, or/and setting concentric cylindrical inner partitions to divide the lower compartment into several lower compartments, the interior of the lower compartment is filled with underwater self-compacting concrete; the upper compartment is composed of several strips uniformly radiating from the center of the circle. The upper compartment longitudinal partition is divided into several upper compartments, and the upper compartments are filled with backfill sand.

Among them: the purpose of subdividing the lower cabin is to make it easier for the underwater self-compacting concrete to fill the entire lower cabin; second, to ensure the verticality of the conical cylindrical concrete heavy parts during the pouring process of the lower cabin, each lower compartment can be adjusted as required The sequence of filling the tank with underwater self-compacting concrete. The purpose of subdividing the upper cabin is to avoid instability caused by the ballast water in the cabin toppling to the same side during transportation; It is necessary to adjust the filling sequence of backfilling sand in each compartment.

As a further improvement of the above technology, the inner side walls of the upper cylindrical end and the lower conical end are installed with grouting pipes penetrating from top to bottom, and a number of reserved holes are evenly arranged on the bottom plate of the compartment, and the above grouting pipes pass through The reserved hole is at a position 30-50 cm above the base surface of the block stone.

The number of the reserved holes is related to the performance of the underwater self-compacting concrete, subject to ensuring that the underwater self-compacting concrete can fill the entire compartment, the fewer the reserved holes, the simpler the construction, but the underwater self-compacting concrete The entire lower compartment needs to be filled, and the performance requirements are higher.

As a further improvement of the above technology, the height of the backfill sand in the upper cabin is determined according to the weight requirements of the wind turbine for the conical cylindrical concrete foundation, and the height of the lower cabin is determined by the bearing capacity of the foundation. The height of the lower cabin is 1-2m.

As a further improvement of the above-mentioned technology, several pull rings are pre-embedded on the outer surface of the conical cylindrical heavy concrete part; It is determined according to the draft of the conical cylindrical concrete heavy part when it is floated and positioned.

As a further improvement of the above-mentioned technology, the outer wall of the conical cylindrical concrete heavy part and the bottom of the lower cabin longitudinal diaphragm are provided with anti-slip rubber, which are fixed by pre-embedded bolts. Leakage of self-compacting concrete.

As a further improvement of the above-mentioned technology, a number of leveling jacks are evenly arranged along the circumference outside the outer wall of the bottom of the conical cylindrical heavy concrete, and the oil cylinder ends of the leveling jacks are fixed on the outer side of the bottom outer wall by pre-embedded bolts. An anti-sinking steel plate is connected to the end of the telescopic rod of the leveling jack, and the anti-sinking steel plate is supported on the top surface of the block stone foundation. The area and thickness of the anti-sinking steel plate are determined by the bearing capacity of the top surface of the block stone foundation and the load transmitted by the jack.

As a further improvement of the above technology, the conical cylindrical concrete weight is placed on the block stone foundation, the thickness of the block stone foundation is generally 1-3m, and the block stone foundation is arranged in the foundation trench of the seabed, and the foundation trench is in the A rounded frustum-shaped groove formed by excavating the seabed. The surrounding of the foundation groove is the slope of the undisturbed soil. The angle of the slope is related to the nature of the soil. The depth is related to the bottom stress of the block foundation and the bearing capacity of the undisturbed soil.

As a further improvement of the above technology, a circle of fence boards is placed at the skirting outside the conical cylindrical concrete weight to prevent the water flow from scouring and hollowing out the block stone foundation.

The present invention also discloses a construction method for the foundation structure of the above-mentioned conical cylindrical offshore wind power generation unit, the specific steps of which are as follows:

(1) Prefabrication of conical cylindrical concrete heavy parts: the longitudinal partition of the lower cabin and the outer wall of the lower cabin, the bottom plate, the longitudinal partition of the upper cabin and the outer wall of the upper cabin, the outer wall of the upper cylindrical end, the anchoring end, External expansion platform, preferably climbing formwork process, from bottom to top to bind steel bars layer by layer, pour concrete, and lift formwork, repeating the cycle, and finally complete the entire conical cylindrical concrete heavy part;

(2) Prestressed tension construction: insert the anchor cables into each anchor hole in turn, use the anchor jack to tension each strand of the anchor cables in each anchor hole in turn, apply a certain prestress and maintain it, and use the anchor Anchor the tensioned anchor cable at the anchor end, remove the anchor jack, and pour cement slurry into the anchor hole under high pressure;

(3) Outfitting of conical cylindrical concrete heavy parts: install leveling jacks, pull rings, rubber fenders for berthing, pedestrian ladders, flanges and other auxiliary facilities;

(4) Excavation of foundation trench: Excavate the weak foundation soil on the surface of the backfill block stone foundation position, preferably using a grab dredger for excavation;

(5) Stone riprap and leveling of block foundation: block stone is thrown from the water surface into the foundation groove of the seabed, and the bottom barge is preferably used for throwing and filling. After throwing and filling to the corresponding elevation, the top surface of the block foundation needs to be leveled. An underwater screed is preferred;

(6) Floating of conical cylindrical concrete heavy parts: After a batch of conical cylindrical concrete heavy parts are prefabricated to meet the age, the dock is filled with water, and the conical cylindrical concrete heavy parts are separated from the dock floor under the action of buoyancy and are in a floating state. In order to meet the requirements of floating stability, it may be necessary to inject a certain amount of ballast water into the upper tank, and the volume of ballast water is determined by calculation of floating stability;

(7) Transportation of conical cylindrical heavy concrete parts: open the dock door, tie the tugboat’s tow cable to the pull ring of the conical cylindrical heavy concrete parts, and the conical cylindrical concrete heavy parts leave the prefabricated dock under the pull of the tugboat and go to the installation Location, in order to ensure reliable operability during the transportation of conical cylindrical heavy concrete, two tugboats are preferred, one main tugboat in the front and one tail tugboat in the back;

(8) Positioning and sinking of conical cylindrical concrete heavy parts: After transporting conical cylindrical concrete heavy parts to the designated place, add a tugboat, tie the towline to the positioning ring, and the three tugboats are evenly opened in turn, and the conical cylindrical concrete The heavy part is accurately positioned at the designated coordinate position under the action of three tugboats; water is poured into the upper cabin, and the conical cylindrical concrete heavy part gradually sinks until it is located on the block stone foundation, and the conical cylindrical concrete is monitored simultaneously during the sinking process The position coordinates of heavy parts, if there is any deviation, it will be adjusted immediately;

(9) Leveling of conical cylindrical concrete heavy parts: measure the levelness of the flange, if the requirements are not met, start the four leveling jacks at the bottom, and adjust the verticality of the conical cylindrical concrete heavy parts through the expansion and contraction of the leveling jacks , and then adjust the levelness of the flange until the levelness of the flange meets the requirements;

(10) Filling the lower cabin with underwater self-compacting concrete: connect the pumped underwater self-compacting concrete output pipeline with the grouting pipeline in turn, turn on the equipment, pour underwater self-compacting concrete into the lower cabin compartment, and monitor the lower compartment compartment in real time The pouring elevation of the inner concrete should be replaced with another compartment after it is filled. Generally, it should be poured symmetrically in sequence. During the pouring process, the levelness of the flange should be monitored in real time. If there is any deviation, the pouring sequence of the compartments should be adjusted until all compartments are poured. Finish;

(11) Backfilling sand in the upper cabin: when the underwater self-compacting concrete in the lower cabin reaches the age, start to backfill the sand in the upper cabin. It is preferable to use belt feeding to drop the sand material into the upper cabin compartment through the cylindrical end. When backfilling the sand, keep each The top surface of the sand in the compartment is basically the same, and the levelness of the flange is monitored in real time. If there is a deviation, the elevation of the top surface of the backfilled sand in each compartment should be adjusted until the elevation of the top surface of the backfilled sand meets the requirements;

(12) Remove the leveling jack: reconfirm that the levelness of the flange meets the requirements, and remove the leveling jack;

(13) Underwater installation of fence boards: install fence boards around the periphery of the conical heavy concrete skirting, preferably on a crane.

Compared with prior art, the beneficial effect of the present invention is:

1. The basic structure of the conical cylindrical offshore wind power generating set according to the present invention can be prefabricated on land to reduce the construction time at sea, and can be quickly installed on site, which is convenient for construction and easy to realize;

2. In the basic structure of the conical cylindrical offshore wind power generating set according to the present invention, since the conical cylindrical concrete heavy part is set as the upper cylindrical end and the lower conical end, the diameter of the upper cylindrical end is according to the flange plate of the offshore wind generating set tower. The top elevation of the upper cylindrical end is determined according to the high water level of the site and the wave height, which can better ensure that the top is not affected by waves. In addition, the diameter of the lower conical end is determined according to the bearing capacity of the foundation. The larger the diameter, the greater the impact on the foundation. The smaller the stress is, and the height of the lower conical end is determined by the weight requirements of the foundation of the offshore wind turbine, the greater the weight requirement, the higher the lower conical end, which can be customized according to the needs of the surrounding area environment, and its impact on the surrounding area environment is small, and the structure is simple ;

3. The basic structure of the conical cylindrical offshore wind power generating set according to the present invention is provided with an upper cabin and a lower cabin at the lower conical end, and the upper and lower cabins are correspondingly divided into several compartments, the upper cabin is filled with sand, and the lower cabin Poured underwater self-compacting concrete, which greatly improves the stability and verticality of the conical cylindrical heavy concrete foundation structure;

4. In the basic structure of the conical cylindrical offshore wind power generating set according to the present invention, a number of leveling jacks are evenly arranged along the circumference outside the outer wall of the conical cylindrical heavy concrete bottom, and the oil cylinder ends of the leveling jacks are fixed on the On the outer side of the bottom outer wall, the verticality of the conical cylindrical concrete weight can be precisely adjusted through the expansion and contraction of the leveling jack, and then the levelness of the flange can be adjusted, which greatly improves the installation accuracy of the conical cylindrical concrete heavy piece;

5. In the basic structure of the conical cylindrical offshore wind power generating set according to the present invention, anti-slip rubber is installed on the outer wall of the conical cylindrical heavy concrete part and the bottom of the longitudinal partition of the lower cabin, which can prevent leakage when the lower cabin is poured with underwater self-compacting concrete. pulp.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment the present invention is described in detail:

Fig. 1 is a schematic diagram of the conical offshore wind power infrastructure described in Embodiment 1;

Fig. 2 is the structural representation of the conical cylindrical concrete heavy part described in embodiment one;

Fig. 3 is A-A sectional view among above-mentioned Fig. 2;

Fig. 4 is B-B sectional view among above-mentioned Fig. 2;

Fig. 5 is the installation diagram of the anti-slip rubber of embodiment one;

Fig. 6 is a schematic diagram of the installation of the leveling jack in Embodiment 1;

Fig. 7 is a flow chart of the construction method of the conical cylindrical offshore wind power infrastructure of the present invention;

Fig. 8 is the structural representation of the conical cylindrical concrete heavy part described in embodiment two;

Fig. 9 is a sectional view of C-C in Fig. 8 above.

Detailed ways

Embodiment one

As shown in Fig. 1 and Fig. 2, the basic structure of the conical cylindrical offshore wind power generating set according to the present invention includes a block stone foundation 10 and a conical cylindrical concrete weight 20 placed thereon, the conical cylindrical concrete The weight 20 includes an upper cylindrical end 21 and a lower conical end 22, the diameter of the upper end of the lower conical end 22 is consistent with the diameter of the upper cylindrical end 21, and the diameter of the upper cylindrical end 21 is according to the diameter of the offshore wind turbine tower flange. The diameter of the upper cylindrical end 21 is determined according to the high water level of the site and the wave height to ensure that the top is not affected by waves. The diameter of the lower conical end 22 is determined according to the bearing capacity of the foundation. The larger the diameter, the greater the impact on the foundation. The smaller the stress is, and the height of the lower conical end 22 is determined by the basis weight requirements of the offshore wind turbine, the higher the weight requirement, the higher the lower conical end 22 .

Both the upper cylindrical end 21 and the lower conical end 22 are provided with prestressed anchor holes, and the anchor cable passes through the outer wall of the upper cylindrical end 21 and the outer wall of the lower conical end 22 successively from the upper anchoring end 211 of the upper cylindrical end 21 Reaching the bottom anchoring end 227, the anchor cable is anchored on the upper anchoring end 211 and the bottom anchoring end 227 after applying a certain pretension, and the anchor hole is filled with cement slurry by high-pressure pouring, so that the anchor cable and the anchor hole wall are tightly bonded.

The top of the upper cylindrical end 21 is installed with a flange 30 for connecting the tower of the offshore wind turbine, and an external expansion platform 40 for installing the tower and operation and maintenance operations. The top of the upper cylindrical end 21 is provided with an inner wall thickness The upper anchor end 211 is expanded inwardly at an appropriate position and is used for pre-embedding the anchor bolts of the flange 30 and installing the prestressed anchor cable. The diameter of the upper cylindrical end 21 is the same as that of the flange 30 of the offshore wind turbine tower. suitable for the diameter.

The outer side of the upper cylindrical end 21 is equipped with a rubber fender 50 for berthing, and above the rubber fender 50 for berthing is installed a pedestrian ladder 60 for operators to go up and down. Platform manhole 70, personnel can climb to the outer expansion platform 40 through the outer expansion platform manhole 70 for operation.

As shown in Figures 1, 3 and 4, the interior of the lower conical end 22 is provided with a compartment floor 221, and the compartment floor 221 divides the interior of the lower conical end 22 into an upper cabin 222 and a lower cabin 223, The lower cabin 223 is provided with several lower cabin longitudinal partitions 225 uniformly radiating from the center of the circle to divide the lower cabin 223 into several lower compartments 2231, and the interior of the lower compartments 2231 is filled with underwater self-compacting concrete 80; The compartment 222 is divided into several upper compartments 2221 by several upper compartment longitudinal partitions 224 uniformly radiating from the center of the circle, and the upper compartments 2221 are filled with backfill sand 90 .

in,

The purpose of subdividing the lower cabin 223: first, to make the underwater self-compacting concrete 80 more easily fill the entire lower cabin 223; The sequence of pouring the underwater self-compacting concrete 80 into each lower compartment 2231 needs to be adjusted.

The purpose of subdividing the upper cabin 222 is: first, to prevent the ballast water in the cabin from overturning to the same side during transportation and causing instability; The filling sequence of backfilling sand 90 in each upper compartment 2221 can be adjusted as required.

As shown in Figure 2, the inner side walls of the upper cylindrical end 21 and the lower conical end 22 are installed with grouting pipes 100 penetrating from top to bottom, and a number of reserved holes 2211 are uniformly arranged on the compartment floor 221. The grouting pipe 100 passes through the reserved hole 2211 to a position 30-50 cm above the base surface.

The number of the reserved holes 2211 is related to the performance of the underwater self-compacting concrete 80, to ensure that the underwater self-compacting concrete 80 can fill the entire lower compartment 2231, the less the number of reserved holes 2211 is, the simpler the construction will be. However, the underwater self-compacting concrete 80 needs to fill the entire lower compartment 2231, and the performance requirements are higher.

The height of the backfill sand 90 in the upper cabin 222 is determined according to the weight requirement of the fan for the conical concrete foundation, and the height of the lower cabin 223 is determined by the bearing capacity of the foundation, and the height of the lower cabin 223 is 1-2m.

Several pull rings 110 are pre-embedded on the outer surface of the conical cylindrical concrete heavy part 20; the pull rings 110 are used for mooring cables when the conical cylindrical concrete heavy part 20 is floated, installed and positioned. The draft is determined when the shaped concrete weight 20 is floated and positioned.

As shown in Fig. 1 and Fig. 5, the outer wall 2232 of the conical cylindrical concrete heavy part 20 and the bottom of the lower cabin longitudinal partition 225 are provided with anti-slip rubber 120, which are fixed by pre-embedded bolts 130. The effect of the anti-screw rubber 120 is It is to prevent grout leakage when the lower cabin 223 is perfused with underwater self-compacting concrete 80 .

As shown in Fig. 2, Fig. 3 and Fig. 6, several bosses 226 that are vertical on one side are evenly arranged on the outside of the outer wall at the bottom of the conical cylindrical concrete weight 20, and each boss 226 is equipped with a leveling jack 140, The oil cylinder end 141 of the leveling jack 140 is fixed on the outer boss 226 of the outer wall at the bottom by embedded bolts 143, and the end of the telescopic rod 142 of the leveling jack 140 is connected with an anti-sinking steel plate 150, and the anti-sinking steel plate 150 Supported on the top surface of the block foundation 10 , the area and thickness of the anti-settling steel plate 150 are determined by the bearing capacity of the top surface of the block foundation 10 and the load transmitted by the leveling jack 140 .

As shown in Figure 1, the conical cylindrical concrete weight 20 is placed on the block stone foundation 10, the thickness of the block stone foundation 10 is generally 1-3m, and the block stone foundation 10 is arranged in the seabed foundation groove 101, the described The seabed foundation trench 101 is a rounded truncated groove formed by excavation on the seabed. The periphery of the foundation trench 101 is an undisturbed soil slope 102. The angle of the slope 102 is related to the nature of the soil. The rock foundation 10 is supported on On the undisturbed soil of the seabed, the excavation depth of the foundation trench 101 is related to the bottom stress of the rock foundation 10 and the bearing capacity of the undisturbed soil.

Place a circle of fence boards 160 at the skirting of the outside of the conical cylindrical concrete weight 20 to effectively prevent the erosion of the water flow from hollowing out the stone foundation 10 .

As shown in Fig. 7, the present invention also discloses the construction method of the above-mentioned conical offshore wind turbine foundation structure, and its specific steps are:

(1) Prefabrication of the conical cylindrical concrete heavy part 20: the lower cabin longitudinal partition 225 and the outer wall of the lower cabin 223, the bottom plate 221, the upper cabin longitudinal partition 224 and the upper cabin 222 outer wall, and the upper cylindrical end are sequentially constructed in the onshore factory dock 21’s outer wall, anchoring end, and external expansion platform 40, the climbing formwork process is preferably used to bind steel bars layer by layer, pour concrete, and lift formwork from bottom to top, and repeat the cycle to finally complete the entire conical cylindrical concrete heavy part 20;

(2) Prestressed tension construction: insert the anchor cables into each anchor hole in turn, use the anchor jack to tension each strand of the anchor cables in each anchor hole in turn, apply a certain prestress and maintain it, and use the anchor The tool anchors the tensioned anchor cable on the upper anchor end 221 and the bottom anchor end 227, removes the anchor jack, and pours cement slurry into the anchor hole under high pressure;

(3) Outfitting of conical cylindrical concrete heavy parts 20: install leveling jack 140, pull ring 110, ship rubber fender 50, pedestrian ladder 60, flange plate 30 and other auxiliary facilities;

(4) Foundation trench excavation: Excavate the weak foundation soil on the surface of the backfill block foundation 10, preferably using a grab dredger;

(5) Stone foundation 10 riprap and leveling: The stone is thrown from the water surface into the foundation groove of the seabed, and the bottom barge is preferably used for throwing and filling. After filling to the corresponding elevation, the top surface of the stone foundation 10 needs to be adjusted. Leveling, preferably using an underwater leveling machine;

(6) Floating of the conical cylindrical concrete heavy parts 20: after a batch of conical cylindrical concrete heavy parts 20 are prefabricated to meet the age, the dock is filled with water, and the conical cylindrical concrete heavy parts 20 are detached from the dock floor under the action of buoyancy and placed in the dock. In the floating state, in order to meet the requirements of floating stability, it may be necessary to inject a certain amount of ballast water into the upper tank 222, and the volume of ballast water is determined by calculation of floating stability;

(7) Transportation of the conical cylindrical concrete heavy part 20: open the dock door, tie the tow cable of the tugboat to the pull ring 110 of the conical cylindrical concrete heavy part 20, and the conical cylindrical concrete heavy part 20 leaves the prefabricated concrete under the tugboat pulling force Dock, go to the installation site, for the reliable operability in the transportation process of the conical cylindrical concrete heavy part 20, two tugboats are preferably towed, a main tugboat in the front, and a tail tugboat in the back;

(8) Positioning and sinking of the conical cylindrical concrete heavy part 20: after the conical cylindrical concrete heavy part 20 is transported to the designated place, add 1 tugboat, tie the towline to the pull ring 110, and the three tugboats are evenly opened in turn, The conical cylindrical concrete heavy part 20 is accurately positioned at the designated coordinate position under the action of three tugboats; water is poured into the upper cabin 222, and the conical cylindrical concrete heavy part 20 gradually sinks until it is seated on the block stone foundation 10 and sinks. Synchronously monitor the position coordinates of the conical cylindrical concrete weight 20 during the process, and adjust immediately if there is any deviation;

(9) Leveling of the conical cylindrical concrete weight 20: measure the levelness of the flange 30, if the requirements are not met, start 4 leveling jacks 140 at the bottom, and adjust the conical cylindrical concrete weight through the expansion and contraction of the leveling jack 140 The verticality of the component 20, and then adjust the levelness of the flange 30 until the levelness of the flange 30 meets the requirements;

(10) Filling the lower cabin 223 with underwater self-compacting concrete 80: connect the pumped underwater self-compacting concrete output pipeline with the grouting pipeline 100 in turn, open the equipment, pour the underwater self-compacting concrete 80 into the lower cabin 223 compartment, and real-time Monitor the pouring elevation of the concrete in the compartment 223 of the lower compartment, and replace it with another compartment after it is filled. Generally, it is poured symmetrically in sequence. During the pouring process, the level of the flange 30 should be monitored in real time. If there is a deviation, the pouring of the compartment should be adjusted sequence until all compartments are filled;

(11) Backfill sand 90 in the upper cabin 222: the underwater self-compacting concrete 80 in the lower cabin 223 reaches the age, start to backfill the sand 90 in the upper cabin 222, and preferably use belt feeding to drop the sand material into the upper cabin 222 compartment through the cylindrical end , when backfilling sand 90, the top surface of the sand in each compartment should be basically consistent, and the levelness of the flange 30 should be monitored in real time. If there is a deviation, the elevation of the top surface of the backfill sand 90 in each compartment should be adjusted until the top surface of the backfill sand 90 The elevation meets the requirements;

(12) Remove the leveling jack 140: reconfirm that the levelness of the flange plate 30 meets the requirements, and remove the leveling jack 140;

(13) Install the fence board 160 underwater: install the fence board 160 around the periphery of the skirting of the conical tubular concrete weight 20, preferably on a crane ship.

Embodiment two:

This embodiment is basically the same as Embodiment 1, the difference is that: as shown in Fig. 8 and Fig. 9, in addition to a number of lower compartment longitudinal partitions 225 uniformly radiating from the center of the circle, the lower compartment 223 is also provided with The lower compartment 223 is divided into lower compartments 2231 by a cylindrical inner partition 228 concentric with the compartment floor 221. In this embodiment, there are sixteen lower compartments 2231, and the interior of the lower compartments 223 is filled with underwater self-compacting concrete 80 .

The foundation structure of the conical cylindrical offshore wind power generating set described in the present invention, the main body structure of the foundation can be prefabricated on land to reduce the construction time at sea, can be quickly installed on site, has little impact on the environment of the surrounding area, and is filled with underwater self-compacting concrete and After backfilling sand, it has good stability, simple structure and high vertical precision of construction, can achieve uniform settlement, and is safe and reliable to use.

The present invention is not limited to the above-mentioned embodiments, and any changes or modifications to the present invention do not depart from the spirit and scope of the present invention. If these changes and modifications belong to the claims and equivalent technical scope of the present invention, then the present invention also Such modifications and variations are implied.

Claims (10)

1. The utility model provides a circular cone cylindric offshore wind generating set foundation structure which characterized in that: the self-compacting concrete pile comprises a foundation and a conical cylindrical concrete heavy piece arranged on the foundation, wherein the conical cylindrical concrete heavy piece comprises an upper cylindrical end and a lower conical end, the diameter of the upper end of the lower conical end is consistent with that of the upper cylindrical end, and underwater self-compacting concrete and backfill sand are sequentially filled in the lower conical end in a layered mode from bottom to top.

2. The conical tubular offshore wind turbine foundation structure of claim 1, wherein: the anchor cable sequentially penetrates through an upper cylindrical end outer wall and a lower conical end outer wall from the upper anchoring end of the upper cylindrical end to reach a bottom anchoring end, a certain pre-tension is applied to the anchor cable, the anchor cable is anchored at the upper anchoring end and the bottom anchoring end, and cement slurry is filled in the anchor hole through a high-pressure pouring method, so that the anchor cable is tightly jointed with the wall of the anchor hole.

3. The conical tubular offshore wind turbine foundation structure of claim 1, wherein: the top of the upper cylindrical end is provided with an inner wall thickness which is inwards enlarged at a proper position to form an upper anchoring end for embedding a flange plate anchoring bolt and installing a prestressed anchoring cable for fixing, and the diameter of the upper cylindrical end is matched with the diameter of the flange plate of the offshore wind turbine tower.

4. The conical tubular offshore wind turbine foundation structure of claim 1, wherein: a ship-leaning rubber fender is installed on the outer side of the upper cylindrical end, a pedestrian ladder for operators to go up and down is installed above the ship-leaning rubber fender, and a platform manhole is arranged at the position where the pedestrian ladder penetrates through the outward expansion platform.

5. The conical tubular offshore wind turbine foundation structure of claim 1, wherein: a bulkhead bottom plate is arranged inside the lower conical end, the bulkhead bottom plate divides the inside of the lower conical end into an upper cabin and a lower cabin, a plurality of lower cabin longitudinal partition plates which are uniformly radiated from the circle center are arranged in the lower cabin, or/and concentric cylindrical inner partition plates are arranged to divide the lower cabin into a plurality of lower bays, and underwater self-compacting concrete is filled in the lower cabin; the upper cabin is divided into a plurality of upper compartments by a plurality of upper cabin longitudinal partition plates which are uniformly radiated from the circle center, and backfill sand is filled in the upper cabin.

6. The conical tubular offshore wind turbine foundation structure of claim 1, wherein: the grouting pipeline is installed on the inner side walls of the upper cylindrical end and the lower conical end and penetrates through the bulkhead bottom plate from top to bottom, a plurality of preformed holes are evenly formed in the bulkhead bottom plate, and the grouting pipeline penetrates through the preformed holes to the position 30-50 cm above the stone foundation surface.

7. The conical tubular offshore wind turbine foundation structure of claim 1, wherein: a plurality of pull rings are embedded in the outer surface of the conical cylindrical concrete heavy piece; and the outer wall of the conical cylindrical concrete heavy piece and the bottom of the lower cabin longitudinal partition plate are both provided with grout stopping rubber and are fixed through embedded bolts.

8. The conical tubular offshore wind turbine foundation structure of claim 1, wherein: the adjusting jack comprises a conical cylinder-shaped concrete heavy piece bottom outer wall, wherein a plurality of adjusting jacks are uniformly arranged on the outer side of the conical cylinder-shaped concrete heavy piece bottom outer wall along the circumference, oil cylinder ends of the adjusting jacks are fixed on the outer side of the bottom outer wall through embedded bolts, the tail ends of telescopic rods of the adjusting jacks are connected with an anti-sinking steel plate, and the anti-sinking steel plate is supported on the top surface of a block stone foundation.

9. The conical tubular offshore wind turbine foundation structure of claim 1, wherein: the height of the lower cabin is 1-2 m, the conical cylindrical concrete heavy piece is placed on a block stone foundation, the thickness of the block stone foundation is 1-3 m, the block stone foundation is arranged in a seabed foundation trench, the foundation trench is an inverted frustum-shaped groove formed by excavation on the seabed, and the periphery of the foundation trench is an undisturbed soil slope; and a circle of fence plate is arranged at the skirting position outside the conical cylindrical concrete heavy piece.

10. A construction method of a foundation structure of a conical tubular offshore wind turbine unit according to any one of claims 1 to 9, comprising the following specific steps:

(1) prefabricating a conical cylindrical concrete heavy part;

(2) pre-stress tension construction;

(3) fitting-out of the conical cylindrical concrete heavy part: installing accessory facilities such as leveling jacks, pull rings, ship-leaning rubber fenders, pedestrian ladders, flange plates and the like;

(4) excavating a foundation trench: excavating soft foundation soil on the surface of the backfilled block stone foundation position;

(5) stone throwing and leveling of the block stone foundation: the rock block is thrown into the seabed foundation trench from the water surface, and after the rock block is thrown and filled to a corresponding elevation, the top surface of the rock block foundation needs to be leveled;

(6) floating the conical cylindrical concrete heavy piece;

(7) transporting the conical cylindrical concrete heavy part;

(8) positioning and sinking the conical cylindrical concrete heavy piece;

(9) leveling a conical cylindrical concrete heavy part:

(10) pouring underwater self-compacting concrete into the lower cabin;

(11) back filling sand into the upper cabin;

(12) dismantling the leveling jack;

(13) and installing the fence plate underwater.