CN114439033A - Reinforced concrete self-sinking umbrella-shaped mudflat wind power foundation and installation method thereof - Google Patents
Reinforced concrete self-sinking umbrella-shaped mudflat wind power foundation and installation method thereof Download PDFInfo
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- CN114439033A CN114439033A CN202210226853.1A CN202210226853A CN114439033A CN 114439033 A CN114439033 A CN 114439033A CN 202210226853 A CN202210226853 A CN 202210226853A CN 114439033 A CN114439033 A CN 114439033A
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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
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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
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
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Abstract
The invention discloses a reinforced concrete self-sinking umbrella-shaped beach wind power foundation and a construction method thereof, wherein the reinforced concrete self-sinking umbrella-shaped beach wind power foundation comprises a main body structure and a top plate, the main body structure is a hollow cone foundation made of reinforced concrete, and the main body structure is inversely arranged on the surface of a foundation during installation; a connecting cylinder connected with the tower is arranged in the main body structure, and sinks into the foundation under the action of the self weight of the upper tower and the fan; the top plate is a circular reinforced concrete plate and is laid on the surface of the foundation after the main body structure is self-sunk and stabilized; and the gap between the top plate and the tower is filled by grouting. The invention also provides a construction method of the reinforced concrete self-sinking umbrella type beach wind power foundation. The invention is a novel foundation form suitable for soft soil areas on mudflats, has the advantages of convenient construction, low manufacturing cost, high bearing capacity and the like compared with the traditional gravity type foundation, and greatly promotes the industrial upgrading of the mudflat wind power.
Description
Technical Field
The invention relates to a coastal beach wind power foundation, in particular to a reinforced concrete self-sinking umbrella-shaped beach wind power foundation and a construction method thereof.
Background
Nowadays, with the increasing energy consumption, the output of traditional fossil energy such as coal, oil and natural gas can not supply the production and living demands of people gradually. It is therefore becoming a global consensus to develop clean, renewable energy sources. Wind energy is regarded as one of the most economic and potential new energy sources, and is widely popularized in recent years. China is vast in breadth and long in coastline, wherein wind power resources in coastal beach intertidal zone areas are rich, and compared with offshore wind power, the offshore wind power generation method has the advantages of low construction cost, easiness in construction and maintenance and the like, and is regarded as the primary choice for site selection of a wind power plant.
At present, common wind power foundation structures include gravity foundations, single-pile foundations, pile group foundations and the like. Aiming at the soft soil geological characteristics of the coastal beach area, the foundation structure is designed according to the geological conditions, the construction technology, the bearing capacity, the economy and the like.
The traditional gravity type foundation reinforced concrete has large using amount which is at least 250m3And before installation, the foundation pit needs to be excavated and leveled, so that the construction amount and labor cost are greatly increased. The single-pile foundation is relatively long in pile body and relatively poor in self rigidity, is easy to break under the action of horizontal load during service, and for a 6MW fan to be developed in the future, the diameter of the single-pile foundation pile reaches 8-10m, so that the single-pile foundation has no pile foundation construction capacity of 8-10m at present in China. The pile group foundation has high bearing capacity, is suitable for any soil quality, is a reliable foundation form, has high cost and complex construction technology, and is not suitable for large-scale development and use of wind power plants. In addition, when the gravity type foundation or the pile foundation is buried in a coastal tidal flat intertidal zone area, overlying soil is continuously lost under the action of tidal water scouring, and further the bearing capacity of the foundation is greatly reduced. Aiming at the problems of the traditional foundation, a novel foundation form suitable for coastal beach areas needs to be developed urgently, and the foundation can promote the rapid development of the wind power industry.
The related research reports in the prior art mainly include:
the invention patent with the Chinese patent publication number of CN 201410654756.8 discloses a reinforced concrete hollow cone mountain wind power flexible foundation, wherein a waste tire rubber particle layer is laid on the foundation along an inverted cone foundation pit; and laying a plain concrete cushion layer, pouring reinforced concrete on the plain concrete cushion layer to form a hollow circular truncated cone foundation with a bottom plate and side walls, backfilling muck dug out from the foundation pit into the circular truncated cone foundation, leveling the filled soil surface, and pouring reinforced concrete to form a foundation top plate. However, most of coastal beach areas are soft soil foundations, the shearing strength of the foundations is poor, external loads cannot be borne by the foundations sufficiently, in addition, inverted cone-shaped foundation pits need to be excavated during construction of the foundations, the process is complex, and the construction amount and the labor cost are greatly increased.
Disclosure of Invention
In order to improve the bearing capacity of the foundation in the coastal beach soft soil foundation, reduce the construction cost and prevent the overlying soil of the foundation from being washed by tidal water and continuously lost, thereby greatly reducing the bearing capacity of the foundation. The invention provides a reinforced concrete self-sinking umbrella-shaped beach wind power foundation.
In order to achieve the purpose, the invention adopts the technical scheme that:
a reinforced concrete self-sinking umbrella-shaped beach wind power foundation comprises a main structure (3) and a top plate (2), wherein the main structure (3) is a hollow cone foundation made of reinforced concrete and is inversely arranged on the surface of the foundation during installation; the top of the main body structure (3) is provided with a connecting cylinder (4) connected with the tower (1), and the connecting cylinder sinks into the foundation under the action of the tower (1) at the upper part and the self weight of the fan; the top plate (2) is a circular reinforced concrete plate, and is laid on the surface of the foundation after the main body structure (3) is self-sunk to be stable; and the gap between the top plate (2) and the tower (1) is filled by grouting.
Preferably, the thickness t of the side wall of the main body structure (3) is 0.5m, the diameter-height ratio D/h is in positive correlation with the upper weight, the diameter D is 8-15m, and the height h is 5-10 m. The vertical bearing capacity of the main body structure (3) is verified through a Terzaghi foundation limit bearing capacity formula, and the specific formula is shown as follows:
pu＝0.3γDNr+qNq+1.2cNc
in the formula puIs the vertical ultimate bearing capacity, r is the soil body weight, D is the foundation diameter, q is the load of the two sides of the foundation, c is the cohesive force, N is the cohesive forcer、NqAnd NcAll are bearing capacity coefficients which can be communicatedObtained through the foundation basic design specification (GB 2011-500007).
Preferably, the connecting cylinder (4) is provided with 8 round holes which are uniformly distributed around the connecting cylinder (4), and the lower end of the connecting cylinder is inserted into the main body structure (3).
Preferably, the top plate (2) is manufactured in situ and has a diameter D1In the range of 15-25m, height h1Is 0.5 m.
More preferably, when the main structure (3) is prefabricated, a layer of concrete with the thickness of 0.3m is poured into a mold, a reinforcing mesh is laid on the concrete, the concrete is poured into the main structure (3), and after 28 days of maintenance, the template is removed to form the main structure (3).
Preferably, when the top plate (2) is manufactured, the reinforcing mesh is laid in the formwork, then concrete is poured, and the formwork is removed after 28 days of maintenance to form the top plate (2).
The invention also aims to provide a reinforced concrete self-sinking umbrella-shaped mudflat wind power foundation construction method, which comprises the following steps:
the first step is as follows: before construction, the foundation is treated by a grouting or powder spraying method, so that the mud flat soft soil foundation reaches the expected shear strength.
And secondly, prefabricating the main body structure (3) according to design requirements, hoisting to a specified installation position, and inversely arranging on the surface of the foundation.
And thirdly, hoisting the tower barrel (1) to the upper part of the main body structure (3), wherein the round holes at the bottom of the tower barrel (1) correspond to 8 round holes in the connecting barrel (4) respectively, and are connected with each other through bolts (5), and the main body structure (3) is sunk into the foundation under the action of the upper weight. The surrounding soft soil reflows to the inside of the foundation in the self-sinking process to become a part of the main structure (3).
Fourthly, after the main body structure (3) is settled to be stable, backfilling surrounding soft soil to a foundation pit, laying a layer of reinforced concrete top plate (2) on the ground surface, filling a gap between the tower barrel (1) and the top plate (2) through grouting in order to enable the tower barrel and the top plate to be integrated, and removing the template after the top plate (2) is maintained, so that the construction of the reinforced concrete self-settling umbrella-type beach wind power foundation is finished.
As mentioned above, the reinforced concrete self-sinking umbrella type beach wind power foundation (umbrella foundation for short) of the invention directly brings beneficial technical effects that:
(1) compared with the traditional gravity type foundation, the umbrella-shaped foundation does not need to excavate a foundation pit and level, and the main body structure (3) can be sunk into the mud flat soft soil foundation only under the action of the weight of the upper part, so that the construction amount is greatly reduced, and the labor cost is reduced.
(2) The surrounding soft soil flows back to the interior of the structure in the self-sinking process of the main body structure (3) and becomes a part of the self weight of the main body structure (3), so that the consumption of concrete is greatly reduced, and the construction cost is reduced.
(3) The main structure (3) is designed into a hollow cone, can sink into a deep foundation under the action of the weight of the upper part, and can move more soil bodies compared with the traditional gravity type foundation when the horizontal and bending moment loads act, so that the umbrella-shaped foundation can resist larger horizontal power loads.
(4) A layer of reinforced concrete top plate (2) is laid on the surface of the foundation, and horizontal and bending moment loads are resisted together through the top plate (2) and the main structure (3), so that the bearing capacity of the umbrella-shaped foundation is further improved.
(5) The top plate (2) has a certain limiting effect on soil around the earth surface, so that the erosion of the overlying soil by the tidal water is prevented, and the bearing capacity of the umbrella-shaped foundation is not lost during service.
Drawings
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a general schematic diagram of a reinforced concrete self-sinking umbrella type beach wind power foundation of the invention.
FIG. 2 is a sectional view of a reinforced concrete self-sinking umbrella type beach wind power foundation of the invention.
Fig. 3 is a detail view of the connector barrel of the present invention.
In the figure: 1. the tower, 2, the roof, 3, the major structure, 4, the connecting cylinder, 5, the bolt.
Detailed Description
The following describes embodiments of the present invention with reference to specific embodiments in conjunction with a construction method and drawings.
Referring to fig. 1, 2 and 3, the reinforced concrete self-sinking umbrella type mudflat wind power foundation comprises a tower frame 1, a tower frame 2, a top plate 3, a main body structure 4, a connecting cylinder 5 and a bolt.
A2 MW wind power foundation needs to be established in a certain coastal beach area, the diameter of the tower (1) is 3m, and the maximum vertical load borne by the foundation is 2800 kN. The main structure (3) with the diameter D of 10m and the height h of 10m can meet the requirement of vertical bearing capacity through calculation of a Terzaghi foundation ultimate bearing capacity formula.
The first step is as follows: when the main structure (3) is prefabricated, a layer of concrete with the thickness of 0.3m is poured into the mold, the reinforcing mesh is laid on the concrete, then the concrete is poured into the foundation, and the template is removed after 28 days of maintenance to form the main structure (3).
The second step is that: the foundation is pretreated by a grouting or powder spraying method, so that the mudflat soft soil foundation reaches the designed expected shear strength.
The third step: and hoisting the main body structure (3) to a specified installation position, and then inversely placing the main body structure on the surface of the foundation.
The fourth step: hoist tower section of thick bamboo (1) to major structure (3) upper portion, correspond 8 round holes respectively on tower section of thick bamboo (1) bottom round hole and connecting cylinder (4), link to each other both through bolt (5), major structure (3) sink into the ground in the effect of upper portion weight. The soft soil around the self-sinking process flows back to the inside of the foundation to become a part of the self-weight of the main structure (3).
The fifth step: and after the main body structure (3) is settled to be stable, backfilling surrounding soft soil to the foundation pit, laying a layer of reinforced concrete top plate (2) on the ground surface, laying a reinforcing mesh in the template when the top plate (2) is manufactured, then pouring concrete, and removing the template after curing for 28 days to form the top plate (2).
And a sixth step: and filling a gap between the tower tube (1) and the top plate (2) by grouting, and finishing the construction of the reinforced concrete self-sinking umbrella-shaped mudflat wind power foundation to form the combined foundation structure shown in the figure 1.
The parts which are not described in the invention can be realized by taking the prior art as reference.
It is further to be understood that the specific embodiments described herein are merely illustrative of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the scope of the invention as defined in the appending claims.
Claims (7)
1. A reinforced concrete self-sinking umbrella-shaped beach wind power foundation is characterized by comprising a main body structure (3) and a top plate (2).
The main structure (3) is a hollow conical foundation made of reinforced concrete and is inversely arranged on the surface of the foundation during installation;
a connecting cylinder (4) connected with the tower (1) is arranged in the main body structure (3) and sinks into the foundation under the action of the self weight of the upper tower (1) and the fan;
the top plate (2) is a circular reinforced concrete plate, and is laid on the surface of the foundation after the main body structure (3) is self-sunk to be stable;
and the gap between the top plate (2) and the tower (1) is filled by grouting.
2. The reinforced concrete self-sinking umbrella type beach wind power foundation according to claim 1, wherein the thickness t of the side wall of the main structure (3) is 0.5m, the diameter-height ratio D/h is in positive correlation with the weight of the upper part, the diameter D is 8-15m, and the height h is 5-10 m. The vertical bearing capacity of the main body structure (3) is verified through a Terzaghi foundation limit bearing capacity formula, and the specific formula is shown as follows:
pu＝0.3γDNr+qNq+1.2cNc
in the formula puIs the vertical ultimate bearing capacity, r is the soil body weight, D is the foundation diameter, q is the load of the two sides of the foundation, c is the cohesive force, N is the cohesive forcer、NqAnd NcAll the parameters are bearing capacity coefficients, and the parameters can be obtained through foundation basic design specifications (GB 2011-500007).
3. The reinforced concrete self-sinking umbrella type beach wind power foundation according to claim 1, wherein the main structure (3) is prefabricated by firstly pouring a layer of concrete with the thickness of 0.3m into a mold, laying a reinforcing mesh on the concrete, then pouring the concrete into the main structure (3), and removing the template after 28 days of maintenance to form the main structure (3).
4. The reinforced concrete self-sinking umbrella type beach wind power foundation according to claim 1, wherein the connecting cylinder (4) is provided with 8 round holes which are uniformly distributed along the circumference of the connecting cylinder (4), and the lower end of the connecting cylinder is inserted into the main body structure (3).
5. The reinforced concrete self-sinking umbrella type beach wind power foundation according to claim 1, wherein the top plate (2) is manufactured on site and has a diameter D1In the range of 15-25m, height h1Is 0.5 m.
6. The reinforced concrete self-sinking umbrella type beach wind power foundation according to claim 1, wherein the top plate (2) is manufactured by laying a reinforcing mesh in a formwork, then pouring concrete, and removing the formwork after 28-day maintenance to form the top plate (2).
7. The reinforced concrete self-sinking umbrella type mudflat wind power foundation construction method based on the claims 1 to 6 is characterized by comprising the following steps:
the first step is as follows: the foundation is pretreated by a grouting or powder spraying method before construction, so that the mudflat soft soil foundation reaches the designed expected shear strength.
And secondly, prefabricating the main body structure (3) according to design requirements, hoisting the main body structure to a specified installation position, and inversely placing the main body structure on the surface of the foundation.
And thirdly, hoisting the tower (1) to the upper part of the main body structure (3), wherein the round holes at the bottom of the tower (1) correspond to 8 round holes in the connecting cylinder (4) respectively, and are connected through bolts (5), and the main body structure (3) sinks into the foundation through the self-weight action of the upper tower (1) and the fan. The surrounding soft soil reflows to the inside of the foundation in the self-sinking process to become a part of the main structure (3).
Fourthly, after the main structure (3) is settled to be stable, backfilling surrounding soft soil to a foundation pit, laying a layer of reinforced concrete top plate (2) on the ground surface, filling a gap between the tower (1) and the top plate (2) through grouting in order to enable the tower and the top plate to form a whole, and dismantling the template after the top plate (2) is maintained, so that the construction of the reinforced concrete self-settling umbrella-type beach wind power foundation is finished.
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| CN202210226853.1A CN114439033A (en) | 2022-03-08 | 2022-03-08 | Reinforced concrete self-sinking umbrella-shaped mudflat wind power foundation and installation method thereof |
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