CN111119226A - Wind power tower pile foundation for self-weight collapsible loess field and construction method - Google Patents
Wind power tower pile foundation for self-weight collapsible loess field and construction method Download PDFInfo
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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
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
- E02D27/14—Pile framings, i.e. piles assembled to form the substructure
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
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Abstract
The invention belongs to the technical field of foundation foundations, and particularly relates to a wind power tower pile foundation of a self-weight collapsible loess field and a construction method. The foundation pile is arranged below a foundation pit with a step-shaped side slope, a generator tower foundation bearing platform is arranged on the upper surface of the bottom of the foundation pit, and a first layer of backfill soil, dark scattered water, a second layer of backfill soil and a ground cover soil layer are sequentially arranged around the wind generator tower foundation bearing platform from bottom to top. The invention carries out multi-channel waterproof protection on the foundation in a larger range, reduces the possibility of foundation soaking, reduces the resource consumption and reduces the foundation investment of the wind power tower foundation. The invention eliminates the wet trap factor through multiple waterproof, and is safe and economical. The invention recovers the earth surface and protects the environment. The invention uses local materials, fully utilizes materials and saves resources.
Description
Technical Field
The invention belongs to the technical field of foundation foundations, and particularly relates to a wind power tower pile foundation of a self-weight collapsible loess field and a construction method.
Background
Collapsible loess is soaked with water under a certain pressure, the structure of the soil is rapidly destroyed, and significant and uneven additional subsidence is generated. Loess which collapses when immersed in water under the pressure of the soil's own weight is called self-weight collapsible loess. China collapsible loess is mainly distributed in most areas such as Shanxi, Shaanxi and Gansu, the west of Henan and parts of Ningxia, Qinghai and Hebei, and local areas of provinces and autonomous regions such as Xinjiang, inner Mongolia, Shandong, Liaoning and Heilongjiang. The wind resources in the areas are rich, and the ecological environment is fragile. Wind power generation is an important component of the emerging new energy industry. The tower of the wind generating set constructed in the collapsible loess area is a problem which is difficult to solve by carrying out foundation treatment, adopting a proper foundation form and waterproof measures and considering ecological environment protection according to the principles of safety, applicability, economy, reasonability, environment protection and resource saving.
The wind power tower foundation generally adopts reinforced concrete extended foundation or pile foundation according to the quality of geological conditions. A wind power plant is built on the self-weight collapsible loess field, and initial construction experience is obtained. But foundation treatment and foundation structures of wind power towers are not yet mature. In collapsible loess place, especially when dead weight collapsible soil layer is thicker, generally adopt the pile foundation to pierce through collapsible loess layer. The foundation pile not only needs to bear the load of the upper wind power tower, but also needs to consider the lower pulling force caused by the negative frictional resistance of loess which is likely to be collapsed due to self weight, the pile length is longer, the building material consumption is high, the economic effect is poor, and the resources are not fully utilized. Meanwhile, in order to prevent adverse effects of gravity subsidence of the loess foundation caused by rainwater on the ground surface on foundation piles, scattered water made of materials such as concrete or geotextile is arranged in a certain range on the ground surface around the wind power tower, so that plants cannot grow in a certain range around the wind power tower, and ecological environment is affected.
Disclosure of Invention
The invention provides a wind power tower pile foundation of a self-weight collapsible loess field and a construction method, and aims to provide a wind power tower pile foundation which can reduce the possibility of foundation soaking through a plurality of effective waterproof measures in a large range, improve the bearing capacity of a foundation pile, reduce the resource consumption and reduce the investment of the wind power tower foundation; the second purpose lies in providing one kind can be waterproof in the underground, recovers the earth's surface after basic construction accomplishes, reduces the wind-powered electricity generation pylon pile foundation of wind-powered electricity generation pylon construction to the local fragile ecological environment's influence.
In order to achieve the purpose, the invention adopts the technical scheme that:
a wind power tower pile foundation of a self-weight collapsible loess field at least comprises a foundation pit, a wind power unit tower foundation bearing platform, a second layer of backfill soil, dark scattered water, a first layer of backfill soil and a foundation pile; the foundation pit side slope of the foundation pit is in a step shape; the foundation pile is arranged at the lower part of the bottom of the foundation pit, and the top of the foundation pile is flush with the bottom surface of the foundation pit; the wind turbine generator tower foundation is connected to the bottom of the foundation pit; the first layer of backfill soil, the hidden scattered water and the second layer of backfill soil are sequentially arranged around the wind turbine tower foundation bearing platform from bottom to top; the upper surface of the bearing platform at the bottom of the wind turbine tower foundation bearing platform is provided with an outward downward slope.
The wind turbine tower foundation bearing platform is a reinforced concrete integrated structure which is sequentially composed of a low cylinder, a frustum and a small cylinder from bottom to top; the upper surface of the dark scattered water is flush with the bottom edge of the frustum, and a gap is arranged between the dark scattered water and the wind turbine tower foundation bearing platform.
The foundation pit bottom is circular and the slope ratio of the foundation pit side slope is 1: 0.5.
The first layer of backfill soil is lime soil or cement soil, and the compaction coefficient is not less than 0.95; the second layer of backfill soil has a compaction coefficient not less than 0.95 and a dry density not less than 18kN/m3The plain soil of (1).
The foundation pit side slope of the foundation pit adopts two-stage steps, a platform is arranged between the two-stage foundation pit side slopes, and the hidden scattered water is arranged on the platform.
The dark water is poured by C10 plain concrete, the thickness of the dark water is 90-200 mm, and the width of the dark water is 2-4 m; expansion joints are arranged at intervals along the circumferential direction of the hidden scattered water, and the upper surface of the hidden scattered water has a slope of 4-7% downwards from outside.
The upper surfaces of the first layer of backfill soil and the second layer of backfill soil are provided with slopes of 4-7% towards the outer side of the foundation.
The distance between the edge of the foundation pit bottom and the bottom edge of the foundation bearing platform of the wind turbine generator tower is 0.6-1 m.
The soil-covering layer is also included; the earth surface covering soil layer is arranged on the second layer of backfill soil, and the thickness of the earth surface covering soil layer is 0.8-1.0 m; the upper surface of the earth surface covering soil layer is provided with a slope towards a lower part.
A construction method of a wind power tower pile foundation of a self-weight collapsible loess field comprises the following steps
The method comprises the following steps: construction of foundation piles
Constructing a foundation pile, and enabling the pile top of the foundation pile to be located at a preset position under the ground;
step two: excavation foundation pit
Excavating a foundation pit with a circular foundation pit bottom, wherein the foundation pit side slope is in two steps, the slope ratio of the two steps is 1:0.5, and foundation pit side slope platform connection is arranged between the two steps; preserving the surface soil layer;
step three: construction of wind turbine generator tower foundation bearing platform
After the second step is finished, constructing a wind turbine generator tower foundation bearing platform on the bottom of the foundation pit, and enabling the outer edge of the lower part of the wind turbine generator tower foundation bearing platform to be 0.6-1 m away from the bottom edge of the foundation pit;
step four: first backfilling
After the third step is finished, performing first tamping backfilling on the periphery of the foundation bearing platform of the wind turbine tower by using a first layer of backfill soil of lime soil or cement soil with a compaction coefficient not less than 0.95, and backfilling the first layer of backfill soil to the height of the foundation pit side slope platform; the upper surface of the first layer of backfill soil has a slope towards the outer side of the foundation;
step five: construction of hidden scattered water
Pouring construction dark scattered water on the first layer of backfill soil and the upper surface of the foundation pit slope platform after the step four is finished; the upper surface of the hidden scattered water is flush with the bottom edge of a frustum of a wind turbine tower foundation bearing platform, and the upper surface of the hidden scattered water has an outward downward slope; a gap is arranged between the hidden scattered water and a foundation bearing platform of the wind turbine tower, and expansion joints are arranged at intervals along the circumferential direction of the hidden scattered water; filling gaps and expansion joints with gap filling agents;
step six: second backfilling
After the fifth step is finished, tamping the hidden scattered water to a position 0.8-1.0 m away from the top of the foundation pit by a second layer of backfill soil in a layering manner, wherein the top surface of the second layer of backfill soil has a slope towards the outside of the foundation;
step seven: backfilling of surface soil
And after the sixth step is finished, backfilling surface soil preserved when the foundation pit is excavated in the second step above the tamped second layer of backfilled soil, restoring the natural earth surface and performing vegetation reconstruction.
Has the advantages that:
1. the method takes the tamped plain soil below the surface soil as a first waterproof drainage measure, takes the outward and downward slope of the frustum in the tower foundation bearing platform of the wind turbine generator set in combination with the hidden scattered water as a second waterproof drainage measure, takes the backfilled grey soil or cement soil around the tower foundation bearing platform of the wind turbine generator set as a third waterproof measure, and carries out waterproof protection on the pile foundation in a larger range, thereby reducing the possibility of foundation soaking, improving the bearing capacity of the foundation pile, reducing the resource consumption and reducing the foundation investment of the wind turbine tower foundation.
2. The invention recovers the earth surface and protects the environment. The invention adopts a waterproof mode of combining the frustum in the foundation bearing platform of the wind turbine generator system tower and the dark scattered water, changes the mode of carrying out waterproofing on the ground surface in the prior art, restores the ground surface by using the preserved ground surface soil after the foundation construction is finished, adapts to the growth of plants, and reduces the influence of the construction of the wind turbine tower on the fragile ecological environment.
3. The invention can use local materials and save resources. The invention utilizes the existing foundation as the tamping soil of the counterweight arrangement to have certain waterproofness, takes the excavation soil of the foundation pit as the source of the plain soil, the lime soil or the cement soil tamping soil waterproof material, and also utilizes the earth surface soil preserved during excavation as the material for restoring the earth surface, thereby being beneficial to the vegetation reconstruction.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to clearly understand the technical solutions of the present invention and to implement the technical solutions according to the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural diagram of the present invention.
In the figure: 1-a wind turbine tower pile foundation bearing platform; 2-covering a soil layer on the ground surface; 3-second layer of backfill soil; 4-foundation pit side slope; 5-dark water dispersion; 6-caulking the asphalt mastic; 7-first layer of backfill soil; 8-basal pit bottom; 9-foundation piles; 10-natural surface.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in 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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
according to the self-weight collapsible loess field wind power tower pile foundation shown in the figure 1, the foundation at least comprises a foundation pit, a wind power unit tower foundation bearing platform 1, a second layer of backfill soil 3, dark scattered water 5, a first layer of backfill soil 7 and a foundation pile 9; the foundation pit side slope 4 of the foundation pit is in a step shape; the foundation pile 9 is arranged at the lower part of the foundation pit bottom 8 of the foundation pit, and the top of the foundation pile 9 is flush with the surface of the foundation pit bottom 8; the wind turbine tower foundation bearing platform 1 is connected to the foundation pit bottom 8; the first layer of backfill soil 7, the hidden scattered water 5 and the second layer of backfill soil 3 are sequentially arranged around the wind turbine tower foundation bearing platform 1 from bottom to top; the upper surface of the bearing platform at the bottom of the wind turbine tower foundation bearing platform 1 is provided with an outward downward slope.
In actual use, firstly, constructing the foundation pile 9, and enabling the pile top of the foundation pile 9 to be located at a preset position under the ground; then excavating a foundation pit with a circular foundation pit bottom 8, and enabling the foundation pit side slopes 4 to be in a step shape, wherein the slope ratio of the foundation pit side slopes 4 is 1:0.5, and foundation pit side slope platform connection is arranged between the step-shaped foundation pit side slopes 4; then, constructing a wind turbine generator tower foundation bearing platform 1 on the foundation pit bottom 8, and enabling the outer edge of the lower part of the wind turbine generator tower foundation bearing platform 1 to be 0.6-1 m away from the edge of the foundation pit bottom 8; after the wind turbine generator tower foundation bearing platform 1 is built, tamping and backfilling for the first time at the periphery of the wind turbine generator tower foundation bearing platform 1 by using a first layer of backfill soil 7 of lime soil or cement soil with a compaction coefficient not less than 0.95, and backfilling the first layer of backfill soil 7 to the height of a foundation pit side slope platform; the upper surface of the first backfilling 7 has a slope towards the outer side of the foundation; then, pouring construction dark water 5 on the first layer of backfill soil 7 and the upper surface of the foundation pit slope platform; the upper surface of the hidden scattered water 5 is flush with the bottom edge of a frustum of the wind turbine tower foundation bearing platform 1, and the upper surface of the hidden scattered water 5 has an outward downward slope; a gap is arranged between the hidden scattered water 5 and the wind turbine tower foundation bearing platform 1, and expansion joints are arranged at intervals along the circumferential direction of the hidden scattered water 5; filling gaps and expansion joints with gap filling agents; after the construction along the hidden scattered water 5, a second layer of backfill 3 is tamped layer by layer at the position 0.8-1.0 m away from the top of the foundation pit from the top of the hidden scattered water 5, and the top surface of the second layer of backfill 3 has a slope towards the outside of the foundation.
The method takes the tamped plain soil below the surface soil as a first waterproof drainage measure, takes the outward and downward slope of the frustum in the tower foundation bearing platform of the wind turbine generator and the dark scattered water as a second waterproof drainage measure, takes the first layer of backfill soil 7 backfilled at the periphery of the tower foundation bearing platform of the wind turbine generator as a third waterproof measure, and carries out waterproof protection on the pile foundation in a larger range, thereby reducing the possibility of foundation soaking, improving the bearing capacity of the foundation pile, reducing the resource consumption and reducing the foundation investment of the wind turbine tower foundation.
Example two:
according to the wind-powered electricity generation tower stake basis in self weight collapsible loess place that figure 1 shows, with the embodiment one difference lie in: the wind turbine tower foundation bearing platform 1 is a reinforced concrete integrated structure sequentially consisting of a low cylinder, a frustum and a small cylinder from bottom to top; the upper surface of the dark water 5 is flush with the bottom edge of the frustum, and a gap is arranged between the dark water 5 and the wind turbine tower foundation bearing platform 1.
When in actual use, the wind turbine generator tower foundation bearing platform 1 adopts the technical scheme, so that the top surface of the wind turbine generator tower foundation bearing platform 1 can be well drained. The frustum edge of the wind turbine tower foundation bearing platform 1 is flush with the upper surface of the dark scattered water 5, so that water in the wind turbine tower foundation bearing platform 1 is discharged to the far end of the wind turbine tower foundation bearing platform 1, and the possibility of foundation soaking is effectively reduced.
When the method is applied specifically, the gaps between the hidden scattered water 5 and the wind turbine tower foundation bearing platform 1 are 10mm wide and are embedded by asphalt mastic.
When the method is used specifically, the frustum of the wind turbine generator tower foundation bearing platform 1 can be set to have a gradient of 4-7%, and the gradient value can be set specifically according to needs so as to facilitate drainage.
Example three:
according to the kind of dead weight collapsible loess place wind power tower stake basis that figure 1 shows, with the embodiment one difference lie in: the foundation pit bottom is circular, and the slope ratio of 4 of the foundation pit side slope is 1: 0.5.
When in actual use, the foundation pit adopts this technical scheme for electric foundation pit is more stable and better assurance the even effect of ground drainage.
Example four:
according to the wind-powered electricity generation tower stake basis in self weight collapsible loess place that figure 1 shows, with the embodiment one difference lie in: the first layer of backfill soil 7 is lime soil or cement soil, and the compaction coefficient is not less than 0.95; the second layer of backfill soil 3 has a compaction coefficient not less than 0.95 and a dry density not less than 18kN/m3The plain soil of (1).
When in actual use, the first layer of backfill soil 7 and the second layer of backfill soil 3 adopt the technical scheme, and the waterproofness of the backfill soil is effectively guaranteed. The sources of the rammed earth materials in the first layer of backfill soil 7 and the second layer of backfill soil 3 are taken from the earth materials excavated in the foundation pit, the local materials are taken, the resources are saved, and the foundation investment of the wind power tower foundation is reduced.
Example five:
according to the wind-powered electricity generation tower stake basis in self weight collapsible loess place that figure 1 shows, with the embodiment one difference lie in: the foundation pit side slopes 4 of the foundation pit adopt two-stage steps, a platform is arranged between the two-stage foundation pit side slopes 4, and the hidden scattered water 5 is arranged on the platform.
During actual use, the foundation pit adopts two-stage ladder, and the setting of dark scattered water 5 is in on the platform for hydroenergy on wind turbine generator system pylon basis cushion cap 1 can effectual row to the distal end of ground, has reduced ground soaking possibility, improves foundation pile 9 bearing capacity.
Example six:
according to the wind-powered electricity generation tower pile foundation in self-weight collapsible loess place that fig. 1 shows, five differences with the embodiment lie in: the dark water 5 is formed by pouring C10 plain concrete, and the thickness of the dark water 5 is 90-200 mm, and the width of the dark water 5 is 2-4 m; expansion joints are arranged at intervals along the circumferential direction of the hidden scattered water 5, and the upper surface of the hidden scattered water 5 has a gradient of 4-7% downwards.
When in actual use, the width of the expansion joint is 10mm, and the expansion joint is caulked by asphalt mastic. The technical scheme is adopted for the dark water 5, so that the safety of the invention in different temperature environments is ensured.
The upper surface of the hidden scattered water 5 is provided with an outward downward slope, so that the effect of draining water to the far end of the foundation is better. The thickness of the dark water 5 and the outward downward slope of the upper surface of the dark water 5 can also be set according to actual needs.
Example seven:
according to the wind-powered electricity generation tower stake basis in self weight collapsible loess place that figure 1 shows, with the embodiment one difference lie in: the upper surfaces of the first layer of backfill soil 7 and the second layer of backfill soil 3 are provided with slopes of 4-7% towards the outer side of the foundation.
During the in-service use, when in-service use, this technical scheme is adopted to first layer backfill 7 and second floor backfill 3 for water on wind turbine generator system pylon basis cushion cap 1 can effectively arrange to wind turbine generator system pylon basis cushion cap 1 distal end, has effectively reduced the ground soaking possibility.
The slopes of the upper surfaces of the first layer of backfill soil 7 and the second layer of backfill soil 3 towards the outer side of the foundation can also be set according to actual needs.
Example eight:
according to the wind-powered electricity generation tower stake basis in self weight collapsible loess place that figure 1 shows, with the embodiment one difference lie in: the distance between the edge of the foundation pit bottom 8 and the bottom edge of the wind turbine tower foundation bearing platform 1 is 0.6-1 m.
When in actual use, the foundation pit bottom 8 adopts the technical scheme, so that the construction is convenient, and the water dispersing area is enlarged.
Example nine:
according to the wind-powered electricity generation tower stake basis in self weight collapsible loess place that figure 1 shows, with the embodiment one difference lie in: the soil-covering layer 2 is also included; the earth surface covering soil layer 2 is arranged on the second layer of backfill soil 3, and the thickness of the earth surface covering soil layer 2 is 0.8-1.0 m; the upper surface of the earth surface covering soil layer 2 is provided with a slope towards the lower part.
When in actual use, the second layer of backfill soil 3 is paved with the earth surface covering soil layer 2, the earth surface covering soil layer 2 is derived from earth surface soil stored in the process of digging a foundation pit, and the natural earth surface 10 enables local plants to adapt to and grow rapidly so as to be beneficial to vegetation reconstruction and effectively reduce the influence of wind power tower construction on the fragile ecological environment.
The upper surface of the earth surface covering soil layer 2 is provided with a slope towards the lower part, so that the downward infiltration of water is reduced.
Example ten:
a construction method of a wind power tower pile foundation of a self-weight collapsible loess field comprises the following steps
The method comprises the following steps: foundation pile 9 construction
Constructing a foundation pile 9, and enabling the pile top of the foundation pile 9 to be located at a preset position under the ground; step two: excavation foundation pit
Excavating a foundation pit with a circular foundation pit bottom 8, and enabling a foundation pit side slope 4 to be in two-stage steps, wherein the slope ratio of the two-stage steps is 1:0.5, and foundation pit side slope platform connection is arranged between the two-stage steps; preserving the surface soil layer;
step three: construction of wind turbine generator tower foundation bearing platform 1
After the second step is finished, constructing the wind turbine generator tower foundation bearing platform 1 on the foundation pit bottom 8, and enabling the outer edge of the lower part of the wind turbine generator tower foundation bearing platform 1 to be 0.6-1 m away from the edge of the foundation pit bottom 8;
step four: first backfilling
After the third step is finished, performing first tamping backfilling on the periphery of the wind turbine tower foundation bearing platform 1 by using a first layer of backfill soil 7 of lime soil or cement soil with the compaction coefficient not less than 0.95, and backfilling the first layer of backfill soil 7 to the height of a foundation pit side slope platform; the upper surface of the first backfilling 7 has a slope towards the outer side of the foundation;
step five: construction of the hidden scattered Water 5
After the fourth step is finished, pouring construction dark water 5 on the first layer of backfill soil 7 and the upper surface of the foundation pit slope platform; the upper surface of the hidden scattered water 5 is flush with the bottom edge of a frustum of the wind turbine tower foundation bearing platform 1, and the upper surface of the hidden scattered water 5 has an outward downward slope; a gap is arranged between the hidden scattered water 5 and the wind turbine tower foundation bearing platform 1, and expansion joints are arranged at intervals along the circumferential direction of the hidden scattered water 5; filling gaps and expansion joints with gap filling agents;
step six: second backfilling
After the fifth step is finished, tamping the hidden scattered water 5 to a position 0.8-1.0 m away from the top of the foundation pit in a layered mode by using a second layer of backfill 3, wherein the top surface of the second layer of backfill 3 is inclined towards the outside of the foundation;
step seven: backfilling of surface soil
And after the sixth step is finished, backfilling the surface soil preserved when the foundation pit is excavated in the second step by adopting the surface soil above the tamped second layer backfilled soil 3, restoring the natural earth surface and performing vegetation reconstruction.
The method takes the tamped plain soil below the surface soil as a first waterproof drainage measure, takes the outward and downward slope of the frustum in the tower foundation bearing platform of the wind turbine generator set in combination with the hidden scattered water as a second waterproof drainage measure, takes the backfilled grey soil or cement soil around the tower foundation bearing platform of the wind turbine generator set as a third waterproof measure, and carries out waterproof protection on the pile foundation in a larger range, thereby reducing the possibility of foundation soaking, improving the bearing capacity of the foundation pile, reducing the resource consumption and reducing the foundation investment of the wind turbine tower foundation. The invention recovers the earth surface and protects the environment. The invention adopts a waterproof mode of combining the frustum in the foundation bearing platform of the wind turbine generator system tower and the dark scattered water, changes the mode of carrying out waterproofing on the ground surface in the prior art, restores the ground surface by using the preserved ground surface soil after the foundation construction is finished, adapts to the growth of plants, and reduces the influence of the construction of the wind turbine tower on the fragile ecological environment. The invention can use local materials and save resources. The invention utilizes the existing foundation as the tamping soil of the counterweight arrangement to have certain waterproofness, takes the excavation soil of the foundation pit as the source of the plain soil, the lime soil or the cement soil tamping soil waterproof material, and also utilizes the earth surface soil preserved during excavation as the material for restoring the earth surface, thereby being beneficial to the vegetation reconstruction.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
In the case of no conflict, a person skilled in the art may combine the related technical features in the above examples according to actual situations to achieve corresponding technical effects, and details of various combining situations are not described herein.
The foregoing is illustrative of the preferred embodiments of the present invention, and the present invention is not to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. Any simple modification, equivalent change and modification of the above embodiments according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.
Claims (10)
1. The utility model provides a wind power tower pile foundation in self weight collapsible loess place, includes the foundation ditch at least, its characterized in that: the wind turbine tower foundation pile foundation structure further comprises a wind turbine tower foundation bearing platform (1), a second layer of backfill (3), dark water dispersion (5), a first layer of backfill (7) and foundation piles (9); the foundation pit side slope (4) of the foundation pit is in a step shape; the foundation pile (9) is arranged at the lower part of the foundation pit bottom (8) of the foundation pit, and the top of the foundation pile (9) is flush with the surface of the foundation pit bottom (8); the wind turbine tower foundation (1) is connected to the foundation pit bottom (8); the first layer of backfill soil (7), the hidden scattered water (5) and the second layer of backfill soil (3) are sequentially arranged around the wind turbine tower foundation bearing platform (1) from bottom to top; the upper surface of the bearing platform at the bottom of the wind turbine tower foundation bearing platform (1) is provided with an outward downward slope.
2. The wind power tower pile foundation of the self-weight collapsible loess site as claimed in claim 1, wherein: the wind turbine tower foundation bearing platform (1) is a reinforced concrete integrated structure sequentially consisting of a low cylinder, a frustum and a small cylinder from bottom to top; the upper surface of the hidden water scattering (5) is flush with the bottom edge of the frustum, and a gap is arranged between the hidden water scattering (5) and the wind turbine tower foundation bearing platform (1).
3. The wind power tower pile foundation of the self-weight collapsible loess site as claimed in claim 1, wherein: the foundation pit bottom is circular, and the slope ratio of the foundation pit side slope (4) is 1: 0.5.
4. The wind power tower pile foundation of the self-weight collapsible loess site as claimed in claim 1, wherein: the first layer of backfill soil (7) is lime soil or cement soil, and the compaction coefficient is not less than 0.95; the second layer of backfill soil (3) has a compaction coefficient not less than 0.95 and a dry density not less than 18kN/m3The plain soil of (1).
5. The wind power tower pile foundation of the self-weight collapsible loess site as claimed in claim 1, wherein: the foundation pit side slopes (4) of the foundation pit are of two-stage steps, a platform is arranged between the two-stage foundation pit side slopes (4), and the hidden scattered water (5) is arranged on the platform.
6. The wind power tower pile foundation of the self-weight collapsible loess site as claimed in claim 1 or 5, wherein: the dark water dispersion (5) is formed by pouring C10 plain concrete, the thickness of the dark water dispersion (5) is 90-200 mm, and the width of the dark water dispersion (5) is 2-4 m; expansion joints are arranged at intervals along the circumferential direction of the hidden scattered water (5), and the upper surface of the hidden scattered water (5) is provided with a slope of 4-7% downwards from outside.
7. The wind power tower pile foundation of the self-weight collapsible loess site as claimed in claim 1, wherein: the upper surfaces of the first layer of backfill soil (7) and the second layer of backfill soil (3) are provided with slopes of 4-7% towards the outer side of the foundation.
8. The wind power tower pile foundation of the self-weight collapsible loess site as claimed in claim 1, wherein: the distance between the edge of the foundation pit bottom (8) and the bottom edge of the wind turbine generator tower foundation bearing platform (1) is 0.6-1 m.
9. The wind power tower pile foundation of the self-weight collapsible loess site as claimed in claim 1, wherein: the soil-covering layer (2) is also included; the earth surface covering soil layer (2) is arranged on the second layer of backfill soil (3), and the thickness of the earth surface covering soil layer (2) is 0.8-1.0 m; the upper surface of the earth surface covering soil layer (2) is provided with a slope towards the lower part.
10. The construction method of the wind power tower pile foundation in the self-weight collapsible loess field is characterized by comprising the following steps
The method comprises the following steps: construction of foundation pile (9)
Constructing the foundation pile (9), and enabling the pile top of the foundation pile (9) to be located at a preset position under the ground;
step two: excavation foundation pit
Excavating a foundation pit with a circular foundation pit bottom (8), and enabling a foundation pit side slope (4) to be in two-stage steps, wherein the slope ratio of the two-stage steps is 1:0.5, and foundation pit side slope platform connection is arranged between the two-stage steps; preserving the surface soil layer;
step three: construction of wind turbine generator tower foundation bearing platform (1)
After the second step is finished, constructing the wind turbine generator tower foundation bearing platform (1) on the foundation pit bottom (8), and enabling the outer edge of the lower part of the wind turbine generator tower foundation bearing platform (1) to be 0.6-1 m away from the edge of the foundation pit bottom (8);
step four: first backfilling
After the third step is finished, performing first tamping backfilling on the periphery of the wind turbine tower foundation bearing platform (1) by using a first layer of backfill soil (7) of lime soil or cement soil with the compaction coefficient not less than 0.95, and backfilling the first layer of backfill soil (7) to the height of a foundation pit side slope platform; the upper surface of the first backfilling (7) has a slope towards the outer side of the foundation;
step five: construction of hidden scattered water (5)
After the fourth step is finished, pouring construction dark water (5) on the first layer of backfill (7) and the upper surface of the foundation pit slope platform; the upper surface of the hidden scattered water (5) is flush with the bottom edge of a frustum of a wind turbine tower foundation (1), and the upper surface of the hidden scattered water (5) has an outward downward slope; a gap is arranged between the hidden scattered water (5) and the wind turbine tower foundation bearing platform (1), and expansion joints are arranged at intervals along the circumferential direction of the hidden scattered water (5); filling gaps and expansion joints with gap filling agents;
step six: second backfilling
After the fifth step is finished, tamping the hidden scattered water (5) to a position 0.8-1.0 m away from the top of the foundation pit in a layered manner by using a second layer of backfill soil (3), wherein the top surface of the second layer of backfill soil (3) has a slope towards the outside of the foundation;
step seven: backfilling of surface soil
And after the sixth step is finished, backfilling surface soil preserved when the foundation pit is excavated in the second step above the tamped second layer of backfilled soil (3), restoring the natural earth surface and performing vegetation reconstruction.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010095874.5A CN111119226A (en) | 2020-02-17 | 2020-02-17 | Wind power tower pile foundation for self-weight collapsible loess field and construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114045859A (en) * | 2021-11-10 | 2022-02-15 | 国网新疆电力有限公司建设分公司 | Power transmission pole tower foundation waterproof system for loess foundation and construction method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114045859A (en) * | 2021-11-10 | 2022-02-15 | 国网新疆电力有限公司建设分公司 | Power transmission pole tower foundation waterproof system for loess foundation and construction method thereof |
| CN114045859B (en) * | 2021-11-10 | 2023-08-11 | 国网新疆电力有限公司建设分公司 | Transmission tower foundation waterproof system for loess foundation and construction method thereof |
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