CN112064664A - Improved structure and improved method for fan foundation - Google Patents
Improved structure and improved method for fan foundation Download PDFInfo
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- CN112064664A CN112064664A CN202010980784.4A CN202010980784A CN112064664A CN 112064664 A CN112064664 A CN 112064664A CN 202010980784 A CN202010980784 A CN 202010980784A CN 112064664 A CN112064664 A CN 112064664A
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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
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
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Abstract
The invention provides a fan foundation transformation structure and a transformation method, wherein the fan foundation transformation structure comprises an original fan foundation which is arranged in a round table shape, a concrete reinforcing layer is additionally arranged on the inclined plane of the original fan foundation, and the reinforcing layer is connected with the original fan foundation and a rock foundation through a plurality of first anchor cables; and determining the position of the new foundation ring by positioning and leveling, then later pouring a layer of concrete layer on the top surface of the original fan foundation, and after the concrete strength reaches a design value, connecting the new foundation ring and the original fan foundation by anchoring through a second anchor cable and applying prestress. Therefore, all parts can be connected into an integral structure form, so that the safety of a new foundation ring and an upper structure is ensured, the integral anti-overturning capacity of the fan is also improved, and the improved fan foundation can adapt to a new fan unit.
Description
Technical Field
The invention relates to the technical field of wind power generation foundations, in particular to a fan foundation reconstruction structure and a reconstruction method.
Background
In the last 20 years, the wind power generation in China is very rapid, particularly, the wind power generation in China has rapidly developed since 2010, and the generated power is larger and larger along with the development of the technology. The design life of the fan is 20 years, but the land acquisition and civil engineering design life is 50 years, and the fan is built in a good wind field in the early stage. In order to reduce the damage to the land and the construction waste, the benefit of fully utilizing the original foundation to construct the new fan after the fan is retired is considerable. However, for some wind turbines and wind power plants which need to be eliminated and updated, how the existing wind turbine foundation should be processed, no specific method is given in the prior art; in addition, because the generally updated and modified wind turbine generator is inconsistent with the original wind turbine generator in terms of specification, weight and the like, the capacity and the height of the new wind turbine generator are generally higher, and the original wind turbine base cannot meet the structural safety requirements of the new wind turbine generator, the newly modified wind turbine generator generally cannot be directly installed on the left wind turbine base, and the prior art does not provide a corresponding technical scheme for the newly modified wind turbine generator.
Disclosure of Invention
In view of the above, the invention provides a fan foundation reconstruction structure and a reconstruction method, and aims to achieve the reconstruction on the premise of fully utilizing the original fan foundation so as to install a fan unit with a larger specification.
The technical scheme of the invention is realized as follows:
on one hand, the invention provides a fan foundation reconstruction structure which comprises an original fan foundation, wherein the original fan foundation is arranged in a round platform shape, a reinforcing layer is additionally arranged on the inclined surface of the original fan foundation, the reinforcing layer, the original fan foundation and a rock foundation are connected through a plurality of first anchor cables, a new foundation ring is arranged above the top surface of the original fan foundation, a pouring layer surrounding the old foundation ring is additionally arranged between the new foundation ring and the top surface of the original fan foundation, and the new foundation ring, the pouring layer and the original fan foundation are connected through a plurality of second anchor cables.
On above-mentioned technical scheme's basis, it is preferred, the back up coat is many reinforced concrete roof beams, many reinforced concrete roof beam is radioactive evenly distributed on the inclined plane of original fan basis around original fan basis central axis, and follows the radial extension on original fan basis.
On the basis of the technical scheme, preferably, the pouring layer is made of reinforced concrete arranged in an annular shape, and the top surface of the pouring layer is flush with the highest end of the reinforcing layer.
Further, preferably, a plurality of anchoring holes for embedding the first anchor cable are vertically arranged on the inclined plane of the original fan foundation at equal intervals along the length direction of the reinforced concrete beam, the bottom end of the first anchor cable is anchored with the original fan foundation, the top end of the first anchor cable penetrates through the reinforced concrete beam and is locked through an anchorage device, and the bottom of the first anchor cable is expanded to be anchored with foundation rocks.
Further, preferably, a plurality of anchoring holes for embedding a second anchor cable are annularly formed in the top surface of the original fan foundation, the bottom end of the second anchor cable is anchored with the original fan foundation, and the top end of the second anchor cable penetrates through the pouring layer and the new foundation ring and is locked through an anchorage device.
Further, preferably, a flange plate is horizontally arranged at the bottom of the new foundation ring, an inner ring of the flange plate is located on the inner side of the new foundation ring, an outer ring of the flange plate is located on the outer side of the new foundation ring, and threaded holes connected with the second anchor cable are respectively formed in the flange plate on the outer side and the flange plate on the inner side of the new foundation ring.
On the other hand, the invention provides a method for transforming a wind turbine foundation, which comprises the following steps:
(1) determining the position of a newly added fixed layer on the original fan foundation inclined plane, and the number and the positions of first anchor cables corresponding to the fixed layer;
(2) vertically drilling a straight hole downwards on the inclined plane of the original fan foundation, penetrating the straight hole into the rock foundation, then reaming the bottom of the straight hole to form an anchoring hole, implanting a first anchor cable into the anchoring hole, enabling an anchor head on the first anchor cable to be matched with the reaming hole to form mechanical self-locking, and injecting grouting material into the anchoring hole;
(3) adding a plurality of uniformly radially distributed reinforced concrete beams on the original fan foundation inclined plane corresponding to the first anchor cable, and applying prestress to the first anchor cable for locking through an anchorage device after the reinforcing layer is solidified;
(4) determining the installation position of the new foundation ring above the original fan foundation, and determining the number and the position of the second anchor cables on the original fan foundation according to the number of the threaded holes of the new foundation ring;
(5) vertically drilling a straight hole downwards on the top surface of the original fan foundation, then reaming to form an anchoring hole, implanting a second anchor cable into the anchoring hole, enabling an anchor head on the second anchor cable to be matched with the reaming hole, and injecting grouting material into the anchoring hole;
(6) implanting at least three common anchor rods on the top surface of the original fan foundation to support the new foundation ring, positioning and leveling the new foundation ring, and simultaneously inserting a second anchor cable into the threaded hole of the new foundation ring to leave a gap between the bottom of the new foundation ring and the top surface of the original fan foundation;
(7) newly adding a pouring layer, and filling the pouring layer into a gap between the bottom of the new foundation ring and the top surface of the original fan foundation;
(8) and after the poured layer is solidified, applying prestress on the second anchor cable through the anchorage device for locking.
Compared with the prior art, the invention has the following beneficial effects:
according to the improved structure of the fan foundation, the plurality of reinforced concrete beams are arranged on the inclined plane of the original fan foundation, so that the structural strength of the original fan foundation in the radial direction is improved, the lateral constraint force of the original fan foundation is increased, and the annular reinforced concrete is additionally arranged on the top surface of the original fan foundation, so that the requirement of leveling, positioning and installing of a new foundation ring is met, and meanwhile, the bearing capacity of the whole fan foundation is improved. Carry out the prestressing force with back up coat and original fan foundation and rock foundation through first anchor rope and be connected, the second anchor rope carries out the prestressing force with new foundation ring, pours layer and original fan foundation and connects for above-mentioned each part is connected as overall structure form, with the security of guaranteeing new foundation ring and superstructure, has increased the whole antidumping ability of fan, thereby realizes that the fan foundation after the transformation can adapt to large-scale fan unit.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic side view of a wind turbine infrastructure retrofit configuration disclosed herein;
FIG. 2 is a top view of a wind turbine infrastructure disclosed herein;
fig. 3 is a partially enlarged view of a portion a in fig. 1.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1, with reference to fig. 2 and 3, an embodiment of the present invention discloses a fan foundation modification structure, which includes an original fan foundation 1, wherein the original fan foundation 1 is arranged in a circular truncated cone shape, a reinforcement layer 2 is newly added on an inclined surface of the original fan foundation 1, the reinforcement layer 2 is connected with the original fan foundation 1 and a rock foundation through a plurality of first anchor cables 3, a new foundation ring 200 is arranged above a top surface of the original fan foundation 1, a pouring layer 4 surrounding the old foundation ring 100 is newly added between the new foundation ring 200 and the top surface of the original fan foundation, and the new foundation ring 200, the pouring layer 4 and the original fan foundation 1 are connected through a plurality of second anchor cables 5.
By adopting the technical scheme, the plurality of reinforced concrete beams are arranged on the inclined plane of the original fan foundation 1, the structural strength of the original fan foundation 1 in the radial direction is increased, the lateral constraint force of the original fan foundation 1 is increased, and the bearing capacity of the whole fan foundation is improved while the leveling, positioning and installation of the new foundation ring 200 are met by adding the annular reinforced concrete on the top surface of the original fan foundation 1. Carry out the prestressing force through first anchor rope 3 with back up coat 2 and original fan foundation 1 and rock foundation and be connected, second anchor rope 5 carries out the prestressing force with new foundation ring 200, pour layer 4 and original fan foundation 1 and connects for above-mentioned each part is connected to overall structure form, with the security of guaranteeing new foundation ring 200 and superstructure, has increased the whole antidumping ability of fan simultaneously, thereby realizes that the fan foundation after the transformation can adapt to large-scale fan unit.
In this embodiment, back up coat 2 is many reinforced concrete roof beams, and many reinforced concrete roof beams are the radial evenly distributed on the inclined plane of original fan basis 1 around original fan basis 1 the central axis, and follow the radial extension of original fan basis 1. From this, consolidate the inclined plane of original fan basis 1 in vertical direction, increased the structural strength of original fan basis 1 on the one hand, on the other hand has increaseed the side direction restraint of original fan basis 1. In addition, a plurality of reinforced concrete are arranged in a radioactive mode, the laying area of the inclined plane of the original fan foundation 1 can be increased as much as possible, the total pouring amount of the foundation concrete is greatly reduced, and the low-carbon environment-friendly requirement is met.
In the embodiment, the pouring layer 4 is made of reinforced concrete arranged in an annular shape, the pouring layer 4 is post-pouring construction, the purpose is for positioning and leveling a new foundation ring, the new foundation ring cannot be directly installed on the top surface of the original fan foundation in the installation process, and leveling is needed, so a certain height needs to be reserved between the new foundation ring and the top surface of the original fan foundation ring, and after the new foundation ring is positioned and leveled on the top surface of the original fan foundation, a layer of reinforced concrete layer is poured behind the top surface of the original fan foundation. The height of the reinforced concrete layer is at least level with the top surface of the old foundation ring, and simultaneously, the top surface of the pouring layer 4 is level with the highest end of the reinforcing layer 2. From this, make concrete structure's pouring layer 4 surround old foundation ring 100, simultaneously, the outer periphery of pouring layer 4 is connected with back up coat 2, thereby make back up coat 2, pour layer 4, original fan basis 1 and old foundation ring 100 connect to be the overall structure form, original fan basis 1's structural strength has been increased, the anchor degree of depth of new foundation ring 200 on original fan basis 1 has been increased simultaneously, improve the withdrawal resistance of vertical direction, thereby after changing large-scale fan unit, make the external load that the fan basis after the transformation can undertake completely, avoid large-scale fan unit to load too big, lead to original fan basis 1 to overturn.
In this embodiment, a plurality of anchor holes 11 for embedding the first anchor cable 3 are vertically arranged on the inclined plane of the original fan foundation 1 at equal intervals along the length direction of the reinforced concrete beam, the bottom end of the first anchor cable 3 is anchored with the original fan foundation 1 and the rock foundation, and the top end of the first anchor cable 3 penetrates through the reinforced concrete beam and is locked through an anchorage device. Specifically, the anchoring hole 11 includes a straight hole which is vertically downward along the inclined plane of the original fan foundation 1, the straight hole penetrates into the rock foundation, and then a large enlarged hole is drilled at the bottom of the straight hole in the rock foundation, wherein the enlarged hole can be in a vertical cone shape or an inverted cone shape. The first anchor cable 3 is inserted into the straight hole, the inner anchor head at the bottom end of the first anchor cable 3 is opened to enable the inner anchor head to be attached to the enlarged hole to form mechanical self-locking, then grouting material is injected into the anchoring hole 11, pouring of the reinforcing layer 2 on the inclined plane of the original fan foundation 1 is completed after the grouting material is solidified, after the reinforcing layer 2 is solidified, prestress is applied to the first anchor cable 3 by using the anchorage device 6, and therefore the first anchor cable 3, the reinforcing layer 2, the original fan foundation and the rock foundation are connected in a prestress mode, the connection of the parts is of an integral structure, and the structural strength and the anti-overturning capacity of the whole fan foundation are improved.
In this embodiment, a plurality of anchor holes 11 for embedding the second anchor cable 5 are annularly formed in the top surface of the original fan foundation 1, the bottom end of the second anchor cable 5 is anchored to the original fan foundation 1, and the top end of the second anchor cable 5 penetrates through the pouring layer 4 and the new foundation ring 200 and is locked through the anchor 6. Specifically, the shape and structure of the anchoring hole 11 and the construction process are similar to those of the anchoring hole 11 on the inclined plane of the fan foundation, after the second anchor cable 5 is anchored in the anchoring hole 11, at least three common anchor rods for supporting the new foundation ring 200 are implanted into the top surface of the original fan foundation 1, so that the new foundation ring 200 is at a certain height from the top surface of the original fan foundation 1, meanwhile, the top end of the second anchor cable 5 penetrates through the new foundation ring 200, and after the pouring layer 4 is poured and cured, the second anchor cable 5 is prestressed by using the anchor 6, so that the second anchor cable 5, the pouring layer 4 and the original fan foundation are prestressed to be connected, the parts are connected into an integral structure, and under the action of the reinforcing layer 2, the structural strength and the anti-overturning capability of the whole fan foundation are improved.
In this embodiment, the bottom of the new basic ring 200 is horizontally provided with a flange 210, the inner ring of the flange 210 is located inside the new basic ring 200, the outer ring of the flange 210 is located outside the new basic ring 200, and the flange 210 outside and inside the new basic ring 200 are respectively provided with a threaded hole connected to the second anchor cable 5. Thus, when installing the new foundation ring 200, the outer anchor head of the second anchor cable 5, which is anchored, is inserted into the threaded hole, so that the second anchor cable 5 is prestressed and locked by the anchor 6.
The invention also discloses a method for reconstructing the fan foundation, which comprises the following steps:
(1) determining the position of the newly added reinforcing layer 2 on the inclined plane of the original fan foundation 1, and the quantity and the position of the corresponding first anchor cables 3 on the reinforcing layer 2;
(2) vertically drilling a straight hole downwards on the inclined plane of the original fan foundation 1, extending the straight hole into the rock foundation, then expanding a hole at the bottom of the straight hole to form an anchoring hole 11, implanting a first anchor cable 3 into the anchoring hole 11, enabling an anchor head on the first anchor cable 3 to be matched with the expanded hole to form mechanical self-locking, and injecting grouting material into the anchoring hole 11;
(3) a plurality of reinforced concrete beams which are uniformly distributed in a radioactive mode are additionally arranged on the inclined plane of the original fan foundation 1 corresponding to the first anchor cable 3, and after the reinforcing layer 2 is solidified, prestress is applied to the first anchor cable 3 through an anchorage device 6 for locking;
(4) determining the installation position of the new foundation ring 200 above the original fan foundation 1, and simultaneously determining the number and the position of the second anchor cables 5 on the original fan foundation 1 according to the number of the threaded holes of the new foundation ring 200;
(5) vertically drilling a straight hole downwards on the top surface of the original fan foundation 1, then reaming to form an anchoring hole 11, implanting a second anchor cable 5 into the anchoring hole 11, enabling an anchor head on the second anchor cable 5 to be matched with the reaming, and injecting grouting material into the anchoring hole 11;
(6) implanting at least three common anchor rods on the top surface of the original fan foundation 1 to support the new foundation ring 200, positioning and leveling the new foundation ring through anchor rod nuts, and simultaneously inserting second anchor cables 5 into threaded holes of the new foundation ring 200 to leave a gap between the bottom of the new foundation ring 200 and the top surface of the original fan foundation 1;
(7) newly adding a pouring layer 4, and filling the pouring layer 4 into a gap between the bottom of the new foundation ring 200 and the top surface of the original fan foundation 1;
(8) and after the pouring layer 4 is solidified, applying prestress on the second anchor cable 5 through an anchorage device 6 for locking.
In the step (1), the reinforcing layer 2 on the inclined plane of the original fan foundation 1 is formed by a plurality of reinforced concrete beams which are uniformly distributed in a radioactive mode, a plurality of first anchor cables 3 are arranged on each reinforced concrete beam at equal intervals along the length direction of each reinforced concrete beam, and the interval between every two adjacent first anchor cables 3 is 15cm-30 cm.
In the step (2), the reaming is performed by using the enlarged head drill rod, and the reaming can be performed by using a vertical cone or an inverted cone.
In the step (3), steel bars are implanted in the vertical direction above the inclined plane of the original fan foundation 1, then the vertical steel bars are bound with the radial steel bars, a template is erected outside a steel bar framework formed by the vertical steel bars and the radial steel bars, and concrete is poured into the template to form the reinforced concrete beam.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The utility model provides a fan basis reforms transform structure, it includes original fan basis (1), original fan basis (1) is the setting of round platform type, its characterized in that: newly-increased back up coat (2) on the inclined plane of original fan basis (1), be connected through many first anchor ropes (3) between back up coat (2) and original fan basis (1) and the rock foundation the top surface top of original fan basis (1) is provided with new foundation ring (200), newly-increased layer (4) of pouring that surrounds old foundation ring (100) between new foundation ring (200) and the original fan basis top surface, connect through many second anchor ropes (5) between new foundation ring (200), pouring layer (4) and original fan basis (1).
2. The wind turbine infrastructure of claim 1, wherein: the back up coat (2) are many reinforced concrete roof beams, many reinforced concrete roof beam is the radioactivity evenly distributed around original fan basis (1) the central axis on the inclined plane of original fan basis (1), and follows the radial extension of original fan basis (1).
3. The wind turbine infrastructure transformation structure of claim 2, wherein: the pouring layer (4) is made of reinforced concrete arranged in an annular shape, and the top surface of the pouring layer (4) is flush with the highest end of the reinforcing layer (2).
4. The wind turbine infrastructure transformation structure of claim 2, wherein: the wind turbine generator is characterized in that a plurality of anchor holes (11) used for burying a first anchor cable (3) are vertically arranged at equal intervals along the length direction of a reinforced concrete beam on the inclined plane of the original wind turbine generator foundation (1), the bottom end of the first anchor cable (3) is anchored with the original wind turbine generator foundation (1), the top end of the first anchor cable (3) penetrates through the reinforced concrete beam and is locked through an anchorage device (6), and the bottom of the first anchor cable (3) is expanded and anchored with foundation rocks.
5. The wind turbine infrastructure of claim 3, wherein: the top surface annular of original fan basis (1) is provided with a plurality of anchor holes (11) that are used for burying putting second anchor rope (5), the bottom and original fan basis (1) of second anchor rope (5) anchor, and the top of second anchor rope (5) is passed and is pour layer (4) and new basis ring (200) and lock through ground tackle (6).
6. The wind turbine infrastructure of claim 1, wherein: the novel foundation ring is characterized in that a flange plate (210) is horizontally arranged at the bottom of the novel foundation ring (200), the inner ring of the flange plate is positioned on the inner side of the novel foundation ring (200), the outer ring of the flange plate is positioned on the outer side of the novel foundation ring (200), and threaded holes connected with the second anchor cable (5) are respectively formed in the outer side of the novel foundation ring (200) and the flange plate (210) on the inner side of the novel foundation ring (200).
7. A method for transforming a wind turbine foundation is characterized by comprising the following steps:
(1) determining the position of the newly added reinforcing layer (2) on the inclined plane of the original fan foundation (1), and the number and the positions of corresponding first anchor cables (3) on the reinforcing layer (2);
(2) vertically drilling a straight hole downwards on the inclined plane of the original fan foundation (1) and penetrating into the rock foundation, then reaming the bottom of the straight hole to form an anchoring hole, implanting a first anchor cable (3) into the anchoring hole, enabling an anchor head on the first anchor cable (3) to be matched with the reaming hole to form mechanical self-locking, and injecting grouting material into the anchoring hole;
(3) a plurality of reinforced concrete beams which are uniformly distributed in a radioactive mode are additionally arranged on the inclined plane of the original fan foundation (1) corresponding to the first anchor cable (3), and after the reinforcing layer (2) is solidified, prestress is applied to the first anchor cable (3) through an anchorage device for locking;
(4) determining the mounting position of the new foundation ring (200) above the original fan foundation (1), and simultaneously determining the number and the position of the second anchor cables (5) on the original fan foundation (1) according to the number of the threaded holes of the new foundation ring (200);
(5) vertically drilling a straight hole downwards on the top surface of the original fan foundation (1), then reaming to form an anchoring hole, implanting a second anchor cable (5) into the anchoring hole, enabling an anchor head on the second anchor cable (5) to be matched with the reaming hole, and injecting grouting material into the anchoring hole;
(6) implanting at least three common anchor rods on the top surface of the original fan foundation (1) to support the new foundation ring (200), positioning and leveling the new foundation ring (200), and simultaneously inserting a second anchor cable (5) into a threaded hole of the new foundation ring (200) to leave a gap between the bottom of the new foundation ring (200) and the top surface of the original fan foundation (1);
(7) newly adding a pouring layer (4), and filling the pouring layer (4) into a gap between the bottom of the new foundation ring (200) and the top surface of the original fan foundation (1);
(8) and after the layer (4) to be poured is solidified, applying prestress on the second anchor cable (5) through an anchorage device for locking.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113338365A (en) * | 2021-06-25 | 2021-09-03 | 中国华能集团清洁能源技术研究院有限公司 | Reinforced structure of onshore fan expanded foundation pipe pile and construction method |
| CN113756361A (en) * | 2021-08-10 | 2021-12-07 | 山东电力工程咨询院有限公司 | Foundation ring type fan foundation reinforcing structure and method |
| CN113833008A (en) * | 2021-08-23 | 2021-12-24 | 山东电力工程咨询院有限公司 | Method and structure for transforming existing foundation ring type fan foundation |
| CN114775676A (en) * | 2022-04-05 | 2022-07-22 | 中国电建集团华东勘测设计研究院有限公司 | Reconstruction method and application suitable for built old wind power plant fan foundation |
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| CN212358366U (en) * | 2020-09-17 | 2021-01-15 | 武大巨成结构股份有限公司 | Fan foundation transformation structure |
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