CN112854288A - Fan cylindrical foundation consisting of underground continuous walls and construction method - Google Patents
Fan cylindrical foundation consisting of underground continuous walls and construction method Download PDFInfo
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- CN112854288A CN112854288A CN202110262846.2A CN202110262846A CN112854288A CN 112854288 A CN112854288 A CN 112854288A CN 202110262846 A CN202110262846 A CN 202110262846A CN 112854288 A CN112854288 A CN 112854288A
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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
- E02D5/18—Bulkheads or similar walls made solely of concrete in situ
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- General Engineering & Computer Science (AREA)
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Abstract
The invention relates to a fan cylindrical foundation consisting of underground continuous walls and a construction method, wherein the fan cylindrical foundation comprises a reinforced concrete bearing platform and the underground continuous walls, the reinforced concrete bearing platform is connected with a fan tower barrel, the underground continuous walls are embedded into the bottom surface of the reinforced concrete bearing platform and are connected into a whole, the underground continuous walls are polygonal cylindrical, reinforced concrete guide walls which play a role in guiding and fixing during construction are arranged on the inner side and the outer side of the underground continuous walls, and the underground continuous walls comprise a plurality of unit wall sections which are uniformly arranged along the circumference and are connected with a closed loop end to end. Compared with the prior art, the method can avoid the problem of damaging undisturbed soil during large excavation or open caisson construction, and has short construction period and good economical efficiency compared with the conventional pile foundation.
Description
Technical Field
The invention relates to the technical field of wind power generation, in particular to a cylindrical foundation of a fan consisting of underground continuous walls and a construction method.
Background
Wind power generation is one of the most mature and most extensive development conditions and commercial development prospects in various renewable energy fields, and available wind energy is widely distributed and has huge reserves in the global scope. Meanwhile, with the continuous maturity of wind power related technologies and the continuous upgrading of equipment, the global wind power generation industry develops at a high speed.
According to the characteristics of geological conditions, onshore wind power foundations can be divided into gravity type extended foundations, beam slab extended foundations, rock anchor rod foundations, pile foundations and cylindrical foundations, wherein the cylindrical foundations have the characteristics of direct stress, full utilization of soil passive soil pressure to resist upper overturning load, high structural efficiency and the like.
The cylindrical foundation is usually constructed by a large excavation method and an open caisson construction method. For example, the construction equipment special for the muck pile invented by Sprahlung and the like adopts a large excavation construction method, and the assembled square-tube-shaped multi-layer concrete underground garage invented by Wangzhiling and the like adopts a sinking well construction method. The large excavation construction method has large excavation and backfilling engineering quantity, damages undisturbed soil and is difficult to excavate when the depth is large; the open caisson construction method is characterized in that a prefabricated cylindrical inner soil body is excavated, the barrel is controlled to sink uniformly, and the inner part of the barrel is backfilled.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a cylindrical fan foundation consisting of underground continuous walls and a construction method, which not only avoid the problem that undisturbed soil is damaged during large excavation or open caisson construction adopted by the conventional cylindrical foundation, but also have short construction period and good economy compared with the conventional pile foundation.
The purpose of the invention can be realized by the following technical scheme:
a fan cylindrical foundation consisting of underground continuous walls comprises a reinforced concrete bearing platform and the underground continuous walls, wherein the reinforced concrete bearing platform is connected with a fan tower barrel, the underground continuous walls are embedded into the bottom surface of the reinforced concrete bearing platform and are connected into a whole, the underground continuous walls are polygonal cylindrical, reinforced concrete guide walls which play a role in guiding and fixing during construction are arranged on the inner side and the outer side of the underground continuous walls, and the underground continuous walls comprise a plurality of unit wall sections which are uniformly arranged along the circumference and are connected with a closed loop end to end.
Furthermore, each unit wall section include horizontal reinforcing bar, horizontal reinforcing bar both ends are provided with the perk section of withstanding adjacent unit wall section.
Furthermore, the tilting section comprises an inclined section and a horizontal section which are integrally formed.
Further, the reinforced concrete guide wall is positioned at the end part, close to the ground, of the underground continuous wall.
Furthermore, a plain concrete cushion layer is arranged between the reinforced concrete bearing platform and the underground continuous wall.
Furthermore, the reinforced concrete bearing platform is connected with the fan tower barrel through the embedded prestressed anchor bolt assembly.
Further, the prestressed anchor bolt assembly is provided with a plurality of prestressed anchor bolt assemblies.
The invention also provides a construction method of the fan cylindrical foundation consisting of the underground continuous walls, which comprises the following steps:
1) excavating and constructing a reinforced concrete guide wall, wherein one end of the reinforced concrete guide wall is buried underground, and the other end of the reinforced concrete guide wall is higher than the ground;
2) constructing each unit wall section of the underground continuous wall at intervals in sections;
3) excavating a foundation pit of the reinforced concrete bearing platform, and removing a reinforced concrete guide wall within the depth range of the foundation pit;
4) and pouring a plain concrete cushion layer, installing the prestressed anchor bolt assembly, and constructing a construction reinforced concrete bearing platform connected with the fan tower.
Further, in the step 1), the reinforced concrete guide wall is at least 200mm higher than the ground.
Further, the step 2) is specifically as follows:
two adjacent unit wall sections are respectively called wall A section and wall B section, the wall A section is excavated firstly, two ends of the wall A section are plugged by joint pipes, the joint pipes are pulled out after the reinforced concrete construction in the wall A section is completed, the wall B section is excavated and constructed, and the tilting sections at two ends of the horizontal steel bars exposed out of the wall B section prop against the wall A section.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention adopts the underground diaphragm wall to form the cylindrical foundation, avoids the large excavation or open caisson construction adopted by the conventional cylindrical foundation, avoids the damage to undisturbed soil, and has small construction difficulty and small operation surface.
2. The reinforced concrete guide wall is arranged below the bottom surface of the bearing platform and on the inner side and the outer side of the underground continuous wall, plays a role in restraining the cylinder body formed by the continuous wall, and improves the bearing capacity of soil bodies inside and outside the cylinder body.
3. The underground continuous wall is connected with the reinforced concrete bearing platform to form a cylindrical foundation with good integrity, and is very suitable for bearing loads which are transmitted by an upper fan and mainly take bending moment.
4. The adjacent wall sections of the invention are supported by the bent horizontal steel bars, thus improving the combination of the adjacent wall sections.
5. For soft soil foundations with high underground water levels, the cylindrical foundation consisting of underground continuous walls is short in construction period and good in economical efficiency compared with the conventional pile foundation.
Drawings
FIG. 1 is a cross-sectional view of a fan barrel foundation made of underground diaphragm walls according to the present invention;
FIG. 2 shows a top view of a fan barrel foundation made up of underground diaphragm walls;
FIG. 3 is a cross-sectional view of a diaphragm wall;
FIG. 4 shows a top view of a diaphragm wall;
FIG. 5 is a front view of a horizontal reinforcement bar;
description of reference numerals: 1. the reinforced concrete bearing platform comprises a reinforced concrete bearing platform, 2, an underground continuous wall, 3, a reinforced concrete guide wall, 4, a plain concrete cushion layer, 5, a prestressed anchor bolt assembly, 6, a wall section A, 7, a joint pipe, 8, a wall section B, 9, horizontal steel bars, 10 and a tilting section.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
The embodiment provides a fan cylindrical foundation consisting of underground continuous walls, and the fan cylindrical foundation is shown in figure 1 and comprises a reinforced concrete bearing platform 1 and the underground continuous walls 2, wherein the underground continuous walls are embedded into the bottom surface of the reinforced concrete bearing platform and are connected into a whole, the underground continuous walls 2 are polygonal cylindrical, and reinforced concrete guide walls 3 which play a role in guiding and fixing during construction are arranged on the inner side and the outer side of the underground continuous walls. The prestressed anchor bolt assembly 5 is buried in the reinforced concrete bearing platform 1 and is connected with the fan tower barrel. Preferably, the reinforced concrete guide wall 3 is located at the end of the underground continuous wall 2 near the ground.
As shown in fig. 2, in the present embodiment, the underground continuous wall 2 is a polygonal cylinder shape in which a plurality of unit wall segments are connected end to end and are uniformly arranged along the circumference. Referring to fig. 4 and 5, each unit wall segment includes horizontal reinforcing bars 9, and both ends of each horizontal reinforcing bar 9 are provided with tilting sections 10 against the adjacent unit wall segments, so as to facilitate the segmental construction of each unit wall segment. The tilting section 10 includes an inclined section and a horizontal section which are integrally formed.
In some embodiments, the reinforced concrete cap 1 is cast-in-place reinforced concrete, and a plain concrete cushion layer 4 is arranged between the reinforced concrete cap and the underground continuous wall 2. In this embodiment, the reinforced concrete bearing platform 1 includes a pier and a cantilever plate, and is connected with the wind turbine tower through the prestressed anchor bolt assembly 5.
In some embodiments, the prestressed anchor bolt assembly 5 may be provided in plurality, so as to improve the stability of the reinforced concrete bearing platform 1 and the wind turbine tower. In this embodiment, the pre-stressed anchor bolt assembly 5 includes an upper anchor plate, an anti-corrosion anchor bolt and a lower anchor plate, which are connected in sequence.
The construction method corresponding to the fan cylindrical foundation consisting of the underground continuous walls provided by the embodiment comprises the following steps:
1) and (3) leveling the site, excavating and constructing the reinforced concrete guide wall 3, wherein the plane position of the foundation is determined by site lofting according to the coordinate value of the central point of the fan foundation, one end of the reinforced concrete guide wall 3 is buried underground, and the other end of the reinforced concrete guide wall is not less than 200mm higher than the ground. In this embodiment, the reinforced concrete guide wall 3 is 300mm higher than the ground, as shown in fig. 3.
2) Referring to fig. 4, the unit wall segments of the underground diaphragm wall are constructed at intervals in sections. Two adjacent unit wall segments are respectively called a wall segment A6 and a wall segment B8. And (4) performing grooving construction on the wall section A6, after the groove is checked, adding the joint pipe 7, and after the steel reinforcement framework is installed, pouring concrete on the wall section A6. And (4) pulling out the joint pipe 7, excavating a groove on the wall section B8, removing laitance at the end of the wall section A6 by using a wall brushing machine, and installing a steel reinforcement framework of the wall section B8, wherein two ends of the horizontal steel bar 9 are upwards tilted. As shown in fig. 5, the raised section 10 is placed against the a-wall section 6 and concrete is poured.
3) And excavating a foundation pit of the reinforced concrete bearing platform 1, removing the reinforced concrete guide wall 3 within the depth range of the foundation pit, and reserving the reinforced concrete guide wall 3 below the reinforced concrete bearing platform 1.
4) And pouring a plain concrete cushion layer 4, installing a pre-stressed anchor bolt assembly 5, and constructing the reinforced concrete bearing platform 1.
The points to be finally explained are: first, in the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounted," "connected," and "connected" should be understood broadly, and may be a mechanical connection or an electrical connection, or a communication between two elements, and may be a direct connection, and "upper," "lower," "left," and "right" are only used to indicate a relative positional relationship, and when the absolute position of the object to be described is changed, the relative positional relationship may be changed;
secondly, the method comprises the following steps: in the drawings of the disclosed embodiments of the invention, only the structures related to the disclosed embodiments are referred to, other structures can refer to common designs, and the same embodiment and different embodiments of the invention can be combined with each other without conflict;
and finally: 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 are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.
Claims (10)
1. The fan cylindrical foundation is characterized by comprising a reinforced concrete bearing platform (1) and an underground continuous wall (2), wherein the reinforced concrete bearing platform (1) is connected with a fan tower cylinder, the underground continuous wall (2) is embedded into the bottom surface of the reinforced concrete bearing platform (1) and is integrally connected, the underground continuous wall (2) is in a polygonal cylindrical shape, reinforced concrete guide walls (3) which play a role in guiding and fixing during construction are arranged on the inner side and the outer side of the underground continuous wall, and the underground continuous wall (2) comprises a plurality of unit wall sections which are uniformly arranged along the circumference and are connected with a closed loop end to end.
2. The draught fan cylindrical foundation consisting of underground continuous walls as claimed in claim 1, wherein each unit wall section comprises horizontal steel bars (9), and both ends of each horizontal steel bar (9) are provided with tilting sections (10) which are propped against the adjacent unit wall sections.
3. A fan barrel foundation consisting of an underground diaphragm wall according to claim 2, wherein the raised section (10) comprises an integrally formed inclined section and a horizontal section.
4. A draught fan cylindrical foundation consisting of an underground diaphragm wall according to claim 1, wherein the reinforced concrete guide wall (3) is located at the end of the underground diaphragm wall (2) close to the ground.
5. A wind turbine cylindrical foundation consisting of an underground diaphragm wall according to claim 1, characterized in that a plain concrete cushion (4) is provided between the reinforced concrete bearing platform (1) and the underground diaphragm wall (2).
6. A wind turbine foundation consisting of underground diaphragm walls, according to claim 1, characterized in that the reinforced concrete bearing platform (1) is connected to the wind turbine tower by means of embedded prestressed anchor bolt assemblies (5).
7. A draught fan cylindrical foundation consisting of an underground diaphragm wall according to claim 6, wherein the pre-stressed anchor bolt assembly (5) is provided in plurality.
8. A method of constructing a cylindrical foundation for a wind turbine consisting of underground diaphragm walls according to any one of claims 1 to 7, comprising the steps of:
1) excavating and constructing a reinforced concrete guide wall (3), wherein one end of the reinforced concrete guide wall (3) is buried underground, and the other end of the reinforced concrete guide wall is higher than the ground;
2) constructing each unit wall section of the underground continuous wall (2) at intervals in sections;
3) excavating a foundation pit of the reinforced concrete bearing platform (1), and removing a reinforced concrete guide wall (3) within the depth range of the foundation pit;
4) pouring a plain concrete cushion layer (4), installing a pre-stressed anchor bolt assembly (5), and constructing a construction reinforced concrete bearing platform (1) connected with the fan tower barrel.
9. The method for constructing a cylindrical foundation for a wind turbine consisting of underground continuous walls according to claim 8, wherein the reinforced concrete guide wall (3) is at least 200mm higher than the ground in the step 1).
10. The construction method of the fan cylindrical foundation consisting of the underground continuous wall according to claim 8, wherein the step 2) is specifically as follows:
two adjacent unit wall sections are respectively called an A wall section (6) and a B wall section (8), the A wall section (6) is firstly excavated, two ends of the A wall section (6) are plugged by joint pipes (7), the joint pipes (7) are pulled out after the construction of the reinforced concrete in the A wall section (6) is completed, the B wall section (8) is excavated and constructed, and the A wall section (6) is propped by the tilting sections (10) at two ends of the exposed horizontal steel bars (9) of the B wall section (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110262846.2A CN112854288A (en) | 2021-03-11 | 2021-03-11 | Fan cylindrical foundation consisting of underground continuous walls and construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110262846.2A CN112854288A (en) | 2021-03-11 | 2021-03-11 | Fan cylindrical foundation consisting of underground continuous walls and construction method |
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| CN112854288A true CN112854288A (en) | 2021-05-28 |
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| CN202110262846.2A Pending CN112854288A (en) | 2021-03-11 | 2021-03-11 | Fan cylindrical foundation consisting of underground continuous walls and construction method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113931166A (en) * | 2021-11-26 | 2022-01-14 | 华能清能通榆电力有限公司 | Barrel-shaped fan foundation of prefabricated sheet pile assembly type connecting structure and construction method thereof |
| CN114108600A (en) * | 2021-11-26 | 2022-03-01 | 华能清能通榆电力有限公司 | Fan foundation of prefabricated sheet pile assembly type connecting structure and construction method thereof |
| CN114150695A (en) * | 2021-12-03 | 2022-03-08 | 华能清能通榆电力有限公司 | Steel sheet pile and diaphragm wall combined cylindrical foundation structure and construction method |
| CN114837210A (en) * | 2022-01-26 | 2022-08-02 | 华能清能通榆电力有限公司 | Fan foundation with honeycomb type underground continuous wall and construction method thereof |
-
2021
- 2021-03-11 CN CN202110262846.2A patent/CN112854288A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113931166A (en) * | 2021-11-26 | 2022-01-14 | 华能清能通榆电力有限公司 | Barrel-shaped fan foundation of prefabricated sheet pile assembly type connecting structure and construction method thereof |
| CN114108600A (en) * | 2021-11-26 | 2022-03-01 | 华能清能通榆电力有限公司 | Fan foundation of prefabricated sheet pile assembly type connecting structure and construction method thereof |
| CN114108600B (en) * | 2021-11-26 | 2024-03-29 | 华能清能通榆电力有限公司 | Fan foundation with prefabricated sheet pile assembly type connecting structure and construction method thereof |
| CN114150695A (en) * | 2021-12-03 | 2022-03-08 | 华能清能通榆电力有限公司 | Steel sheet pile and diaphragm wall combined cylindrical foundation structure and construction method |
| CN114837210A (en) * | 2022-01-26 | 2022-08-02 | 华能清能通榆电力有限公司 | Fan foundation with honeycomb type underground continuous wall and construction method thereof |
| WO2023143148A1 (en) * | 2022-01-26 | 2023-08-03 | 中国华能集团清洁能源技术研究院有限公司 | Wind turbine foundation having honeycomb type underground diaphragm wall and construction method of wind turbine foundation |
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