New mixed tower foundation utilizing old and original mixed tower foundation

Abstract

The utility model provides a new mixed tower foundation utilizing an old and original mixed tower foundation, which comprises an original small mixed tower foundation and a new foundation, the new foundation is formed by pouring on the outer surface of the original small mixed tower foundation through a restrictive section expansion method, and a pre-stressed anchor cable stress steering device is arranged in the new foundation. The device is used for conducting direction transfer on the pre-stressed anchor cable tensioning force. The new foundation is poured on the outer side of the original foundation, the new foundation and the old foundation are connected through embedded steel bars, the pre-stressed anchor cable stress steering device is arranged in the foundation, the tension force of the pre-stressed anchor cable can be transferred in the direction through the cavity of the original foundation and the anchor cable hole channel in the original foundation, and the original anchor cable pre-stressed hole channel is effectively applied.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of wind power foundation reconstruction technology, especially to a new mixed tower foundation for old mixed tower foundation. BACKGROUND

[0002] In the field of wind power construction, some small units of wind power adopt mixed tower structure (i.e. the wind power tower barrel wall adopts reinforced concrete structure), and the foundation is set as a mixed tower foundation. The mixed tower foundation is different from the conventional foundation in that a cavity is arranged in the middle of the foundation to facilitate maintenance personnel to enter the cavity to maintain the prestressed anchor cable of the mixed tower. With the demand for upgrading and reconstruction of small units, the original small unit mixed tower will be upgraded and reconstructed to improve the wind power hour utilization number and power generation and improve the economic benefits of the wind farm. Considering that these small units have used mixed tower structure, and the mixed tower structure has advantages in large units, the wind farm will still use mixed tower structure with high probability during upgrading and reconstruction.

[0003] According to the prior art, the mixed tower structure of the original small unit and the mixed tower foundation thereunder will be completely removed to newly build a new mixed tower foundation. The existing construction measures have the disadvantages of poor environmental protection, poor resource utilization, high engineering construction cost, long construction period and the like due to the removal of the original infrastructure. Therefore, it is necessary to develop a new mixed tower foundation for old mixed tower foundation and a construction method to solve the problems of mispositioning of the new mixed tower body external prestressed anchor cable and the original foundation prestressed anchor cable hole, insufficient bearing capacity of the original foundation and the like during the upgrading and reconstruction process, which has good application prospect. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing a new mixed tower foundation for old mixed tower foundation, which effectively solves the problems of mispositioning of the new mixed tower body external prestressed anchor cable and the original foundation prestressed anchor cable hole and insufficient bearing capacity of the original foundation.

[0005] According to the utility model, a new mixed tower foundation for old mixed tower foundation is provided, which comprises an original small mixed tower foundation and a newly built foundation. The newly built foundation is formed by pouring on the outer surface of the original small mixed tower foundation through a restrictive expansion section method. A prestressed anchor cable stress redirection device is arranged in the newly built foundation to redirect the prestressed anchor cable tension.

[0006] Further, the original small mixed tower foundation is integrally formed by a bottom cylinder, a middle circular frustum body and a top hollow cylinder.

[0007] Further, the newly built foundation comprises a new middle circular frustum body and a new top hollow cylinder, and the connection between the new foundation and the old foundation is enhanced by planting a reinforcing bar and using an interface agent.

[0008] Further, the top hollow cylinder of the original small tower foundation is removed in a height range and the original steel bars are reserved, and the original application is utilized in the new top hollow cylinder of the newly established foundation.

[0009] Further, the outer surface of the original small tower foundation is surface-anchored with steel bars with a diameter of 12 mm and a longitudinal and transverse interval of 300 mm, and the anchoring depth is not less than 250 mm.

[0010] Further, the joint surface of the original small tower foundation and the newly established foundation is chiseled and brushed with an interface agent before pouring to enhance the connection strength.

[0011] Further, the newly established foundation is designed by a limit value expansion section method, and the original small tower foundation is expanded in width; the limit principle of the limit value expansion section method is that the steel bars of the original small tower foundation remain unchanged and are connected with the steel bars in the newly established foundation.

[0012] Further, the prestressed anchor cable stress diversion device comprises an upper steel pipe, a middle steel pipe, a lower steel pipe and a diversion wheel; the upper steel pipe is embedded in the newly established foundation, the lower steel pipe is nested in the prestressed anchor cable channel of the original small tower foundation, the middle steel pipe is welded to connect the upper steel pipe and the lower steel pipe, and the diversion wheel comprises a fixed shaft and a movable wheel, the movable wheel rotates around the fixed shaft to realize the direction transfer of the prestressed anchor cable tension.

[0013] Further, the prestressed anchor cable stress diversion device further comprises a sealing cover, the sealing cover is used for preventing damage to the diversion wheel during concrete pouring and providing corrosion resistance and environmental erosion resistance; the sealing cover is made of high-strength composite material or corrosion-resistant metal.

[0014] Further, the prestressed anchor cable channel of the original small tower foundation is reserved and utilized; the prestressed anchor cable in the new tower foundation passes through the original anchor cable channel through the diversion device and realizes effective direction transfer.

[0015] The technical scheme of the utility model pours the newly established foundation outside the original foundation, anchors the new and old foundations, sets the prestressed anchor cable stress diversion device in the foundation, utilizes the original foundation cavity and the anchor cable channel in the original foundation, and can transfer the tension of the prestressed anchor cable. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0017] Figure 1 It is the plane plan view of the original small mixing tower foundation of the embodiment of the present application.

[0018] Figure 2 It is the section view of the original small mixing tower foundation of the embodiment of the present application.

[0019] Figure 3 It is the plane plan view of the large mixing tower foundation after transformation of the embodiment of the present application.

[0020] Figure 4 It is the section view of the large mixing tower foundation after transformation of the embodiment of the present application.

[0021] Figure 5 It is the section view of the steering device of the embodiment of the present application.

[0022] Figure 6 It is the plane plan view of the steering device of the embodiment of the present application.

[0023] In the figure: 1, original small mixing tower foundation; 101, original bottom cylinder; 102, original middle circular truncated cone body; 103, original top hollow cylinder;

[0024] 2, newly established foundation; 201, new middle circular truncated cone body; 202, new top hollow cylinder;

[0025] 3, original small mixing tower wall; 4, foundation; 5, new mixing tower wall; 6, new mixing tower body prestressed anchor cable; 7, original small mixing tower body prestressed anchor cable; 8, original prestressed anchor cable hole;

[0026] 9, prestressed anchor cable stress steering device; 901, upper steel pipe; 902, middle steel pipe; 903, lower steel pipe; 904, steering wheel; 905, sealing cover; 9041, fixed shaft; 9042, movable wheel. DETAILED DESCRIPTION

[0027] The technical solutions of the present application will be described clearly and completely in combination with the embodiments. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0028] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like is the orientation or positional relationship shown based on the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0029] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise explicitly specified. In addition, the terms "mounting", "connection", "connection" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0030] Embodiment 1

[0031] As shown in Figures 1-6 ,

[0032] A new mixed tower foundation of the old mixed tower foundation, comprising an original small mixed tower foundation 1 and a newly set foundation 2, wherein:

[0033] The original small mixed tower wall 3 is fixed on the original small mixed tower foundation 1, and the original small mixed tower foundation 1 comprises an original bottom cylinder 101, an original middle circular truncated cone body 102 and an original top hollow cylinder 103, the original bottom cylinder 101, the original middle circular truncated cone body 102 and the original top hollow cylinder 103 are integrally formed from bottom to top, and the original bottom cylinder 101 is fixed on the foundation 4.

[0034] The new mixed tower wall 5 is fixed on the newly set foundation 2, and the newly set foundation 2 comprises a new middle circular truncated cone body 201 poured outside the original middle circular truncated cone body 102 and a new top hollow cylinder 202 poured at the position of the original top hollow cylinder 103.

[0035] Specifically, when pouring the new foundation 2, the original top hollow cylinder 103 of the original small tower foundation 1 is removed in the height H1 range, and the original steel is retained and integrated with the new top hollow cylinder 202 of the new foundation 2 for pouring and old application.

[0036] Specifically, when pouring the new foundation 2, the original small tower foundation 1 is treated with surface planting of steel with a diameter of 12mm on the outer surface in a longitudinal and transverse direction at intervals of 300mm, and the length of the steel in the new and old foundations is not less than 250mm. After the surface planting of the original small tower foundation 1, chiseling and cleaning are performed.

[0037] Specifically, the new foundation 2 is arranged on the outer surface of the original small tower foundation 1, the interface agent is brushed in advance before pouring the new foundation 2 at the joint surface of the new foundation 2 and the original small tower foundation 1, the dimensions of the new foundation 2, including the width B of the outer expansion of the original small tower foundation 1, the height H4 of the new middle circular cone body, the height H3 of the new top hollow cylinder, and the steel in the new foundation 2 are determined by finite element calculation, and the principle for determination is that the internal steel of the original small tower foundation remains unchanged.

[0038] Specifically,

[0039] Because the diameter of the new tower wall 5 is larger than that of the original small tower wall 3, the new tower wall 5 is located outside the original small tower wall 3 which has been removed, and the width B2 of the new top hollow cylinder of the new foundation 2 is greater than the width B1 of the original top hollow cylinder of the original small tower foundation 1.

[0040] The new tower body prestressed anchor cable 6 is also located outside the original small tower body prestressed anchor cable 7 which has been removed. The original prestressed anchor cable hole 8 and the new tower body prestressed anchor cable 6 are not on the same vertical line, and the new tower body prestressed anchor cable 6 will produce an angle when tensioned, which is extremely unfavorable for the tensioning work of the prestressed anchor cable and is easy to cause damage and data distortion of the new tower body prestressed anchor cable 6.

[0041] The prestressed anchor cable stress conversion is performed in the foundation, and the prestressed anchor cable stress redirection device 9 is arranged in the new foundation 2. The prestressed anchor cable stress redirection device 9 can easily change the direction of the tensioning force of the prestressed anchor cable through the movable wheel 9042 arranged inside, and the original prestressed anchor cable hole 8 is effectively applied.

[0042] Specifically, the prestressed anchor cable stress redirection device 9 includes five parts, namely, an upper steel pipe 901, a middle steel pipe 902, a lower steel pipe 903, a redirection wheel 904, and a sealing cover 905, wherein:

[0043] The steering wheel 904 comprises a fixed shaft 9041 and a movable wheel 9042, the fixed shaft 9041 is fixedly welded at the bottom of the upper steel pipe 901 and the top of the lower steel pipe 903, and the movable wheel 9042 is wrapped on the fixed shaft 9041 and can rotate and roll around the fixed shaft 9041 under the condition of extremely small friction.

[0044] The upper steel pipe 901 is arranged directly below the new-mixed-tower-body prestressed anchor cable 6 and is embedded in the newly-established foundation 2, and the length of the upper steel pipe 901 in the newly-established foundation 2 is not less than 250 mm. The lower end of the lower steel pipe 903 is nested in the original prestressed anchor cable channel 8 of the original small-mixed-tower foundation, and the upper end is arranged in the newly-established foundation 2, and the length of the lower steel pipe 903 in the new and old foundations is not less than 250 mm. The middle steel pipe 902 is welded and connected with the upper steel pipe 901 and the lower steel pipe 3-2 and is used for protecting the new-mixed-tower-body prestressed anchor cable 6 in the middle steel pipe 902.

[0045] The utility model discloses a construction method of a new-mixed-tower foundation of an old original mixed tower foundation, which comprises the following steps:

[0046] 1. The wind tower foundation of the wind power equipment is generally divided into three parts, i.e., a bottom cylinder, a middle circular table body and a top circular table body. For the mixed tower foundation, the mixed tower wall is provided with a prestressed anchor cable outside the body, and the prestressed anchor cable has tensioning and maintenance requirements. In order to meet the requirements, the wind tower foundation is generally provided with a cavity inside, so that personnel can enter the inside of the foundation to perform tensioning and maintenance work on the prestressed anchor cable. The wind tower foundation provided with the cavity forms a special mixed tower foundation.

[0047] Because the new mixed tower wall 5 has a larger diameter than the original small mixed tower wall 3, the new mixed tower wall 5 is located outside the original small mixed tower wall 3 which has been removed, and the width B2 of the hollow cylinder of the top of the new large unit mixed tower is greater than the width B1 of the hollow cylinder of the top of the original small unit mixed tower, so that the prestressed anchor cable stress device 3 can be conveniently installed.

[0048] The first step of the utility model is to remove the original top hollow cylinder of the existing small mixed tower foundation within the height H1 range, and the original steel bars are retained in the new mixed tower foundation for recycling.

[0049] 2. Because the stress of the original small mixed tower foundation generally cannot meet the requirements of the new large mixed tower foundation, the diameter of the large mixed tower foundation is generally greater than that of the original small mixed tower foundation. In order to meet the stress requirements of the new large mixed tower foundation, the small mixed tower foundation needs to be recycled by using the expansion section method when the wind power small mixed tower is upgraded to a large mixed tower. The wind tower foundation is subjected to wind load for a long time, and the fatigue effect is obvious. In order to solve the problem of the combination of the new and old foundations during the in-situ reconstruction of the wind tower foundation, the combination surface of the new and old foundations needs to be treated.

[0050] The utility model discloses second step: the surface of the original small mixed tower foundation 1 is handled with the surface planting of the reinforcing steel bar of 12mm diameter in longitudinal and transverse interval 300mm, and the length of the reinforcing steel bar in the new and old foundation is not less than 250mm, and after the surface planting of the reinforcing steel bar of the original small mixed tower foundation, the chiseling and cleaning are carried out again.

[0051] 3. In order to solve the problem of insufficient stress of the original foundation during the process of in-situ reconstruction of the new large mixed tower foundation, it is necessary to set a new foundation on the surface of the old foundation by expanding the cross section or other methods.

[0052] The utility model discloses third step: set up new foundation 2 on the outer surface of the original small mixed tower foundation 1, the interface agent is brushed in advance before the pouring of new foundation 2, the size of the new extension width B of the original small mixed tower foundation 1, the new middle part circular truncated cone body H4, the height H3 of the new top hollow cylinder and the reinforcing steel bar in new foundation 2 are determined by finite element calculation, and the principle is that the reinforcing steel bar in the original small mixed tower foundation remains unchanged.

[0053] 4. Because the diameter of the new mixed tower wall 5 is larger than that of the original small mixed tower wall 3, the position of the new mixed tower wall 5 will be outside the original small mixed tower wall 3 that has been removed, and the new mixed tower body prestressed anchor cable 6 will also be outside the original small mixed tower body prestressed anchor cable 7 that has been removed. The original prestressed anchor cable hole 8 and the new mixed tower body prestressed anchor cable 6 will not be on the same vertical line, and when the new mixed tower body prestressed anchor cable 6 is prestressed and tensioned, an angle will be generated, which will be extremely unfavorable for the tensioning work of the prestressed anchor cable and will easily cause damage to the new mixed tower body prestressed anchor cable 6 and data distortion.

[0054] The utility model discloses fourth step: prestressed anchor cable stress conversion is carried out in the foundation, and prestressed anchor cable stress redirection device 9 is arranged in new foundation 2, and the tensioning force of the prestressed anchor cable can be easily diverted in direction through the movable wheel 9042 arranged in the prestressed anchor cable stress redirection device 9, and the original anchor cable prestressed hole 4 is effectively applied.

[0055] Specifically, the prestressed anchor cable stress redirection device 9 includes five parts, which are an upper steel pipe 901, a middle steel pipe 902, a lower steel pipe 903, a redirection wheel 904 and a sealing cover 905.

[0056] The redirection wheel 904 includes a fixed shaft 9041 and a movable wheel 9042, the fixed shaft 9041 is fixedly welded at the bottom of the upper steel pipe 901 and the top of the lower steel pipe 903, and the movable wheel 9042 is wrapped on the fixed shaft 9041 and can rotate and roll around the fixed shaft 9041 under very small friction.

[0057] The upper steel pipe 901 is positioned directly below the prestressed anchor cable 6 of the new concrete tower body and embedded within the newly constructed foundation 2. The upper steel pipe 901 has a length of at least 250mm both inside and outside the newly constructed foundation 2. The lower steel pipe 903 has its lower end nested within the original prestressed anchor cable duct 8 of the original small concrete tower foundation, and its upper end positioned within the newly constructed foundation 2. The length of the lower steel pipe 903 within both the old and new foundations is at least 250mm. The middle steel pipe 902 is welded to the upper steel pipe 901 and the lower steel pipe 902 to protect the prestressed anchor cable 6 of the new concrete tower body within it.

[0058] With the above setup, the newly constructed foundation 2 is poured to form the new large concrete tower foundation of this utility model embodiment.

[0059] This invention maintains the original reinforcement configuration of the original foundation slab, while a new foundation is poured outside the original foundation, with reinforcement bars connecting the old and new foundations. This invention also incorporates a prestressed anchor cable force redirection device within the foundation, utilizing the existing foundation cavity and anchor cable ducts to redirect the tension force of the prestressed anchor cables, effectively utilizing the existing prestressed anchor cable ducts. Compared to existing technologies, this invention can fully utilize existing mixed-structure foundations in upgrade and renovation projects, effectively reducing project costs and construction time.

[0060] Example: A 2.5MW wind turbine is being upgraded to a 7.25MW unit. The original foundation was a 15-meter diameter frustum-shaped gravity foundation. The original foundation used approximately 400m³ of reinforced concrete. 3 If the traditional techniques of demolition, reduction, or enlargement of the cross-section are adopted, the wind load bending moment after upgrading the 2.5MW unit to a 7.25MW unit will be approximately three times the original bending moment. The diameter of the new foundation will be approximately 20 meters, and the amount of reinforced concrete used will be approximately 800 cubic meters. 3 By adopting the technical solution of this utility model, the newly designed foundation fully utilizes the existing small concrete tower foundation, and the amount of reinforced concrete used for the new foundation is approximately 500m³. 3 It saves 300m³ of reinforced concrete compared to conventional technology. 3 This saves approximately 37.5% of the workload, demonstrating a significant effect.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A new tower foundation for an old tower foundation, characterized in that The original small mixed tower foundation and a newly established foundation are included, the newly established foundation is formed by pouring through a limited expansion section method on the outer surface of the original small mixed tower foundation, and a prestressed anchor cable stress steering device is arranged in the newly established foundation to steer the tension of the prestressed anchor cable.

2. The new cast-in-place pile foundation of the old cast-in-place pile foundation according to claim 1, characterized in that, The original small mixed tower foundation is integrally formed by a bottom cylinder, a middle circular truncated cone and a top hollow cylinder; the newly established foundation includes a new middle circular truncated cone and a new top hollow cylinder, and the connection between the new and old foundations is enhanced by planting steel bars and interface agents.

3. The new cast-in-place pile foundation of the old pile foundation according to claim 2, characterized in that, The top hollow cylinder of the original small mixed tower foundation is removed in a height range while retaining the original steel bars, and the top hollow cylinder is applied by recycling in the new top hollow cylinder of the newly established foundation.

4. The new cast-in-place pile foundation of the old cast-in-place pile foundation according to claim 1, characterized in that, The outer surface of the original small mixed tower foundation is planted with steel bars with a diameter of 12 mm at an interval of 300 mm in the longitudinal and transverse directions, and the planting depth is not less than 250 mm.

5. The new cast-in-place pile foundation of the old cast-in-place pile foundation according to claim 1, wherein, The joint surface between the original small mixed tower foundation and the newly established foundation is chiseled and treated, and an interface agent is brushed before pouring to enhance the connection strength.

6. The new cast-in-place pile foundation of the old cast-in-place pile foundation according to claim 1, characterized in that, The newly established foundation is designed by the expansion section method and is expanded in width outside the original small mixed tower foundation.

7. The new cast-in-place pile foundation of the old cast-in-place pile foundation according to claim 1, characterized in that; The newly established foundation is designed by the limited expansion section method and is expanded in width outside the original small mixed tower foundation. The limitation principle of the limited expansion section method is that the steel bars of the original small mixed tower foundation remain in the original configuration and are connected with the steel bars in the newly established foundation.

8. The new cast-in-place pile foundation of the old cast-in-place pile foundation according to claim 1, characterized in that, The prestressed anchor cable stress steering device includes an upper steel pipe, a middle steel pipe, a lower steel pipe and a steering wheel; the upper steel pipe is embedded in the newly established foundation, the lower steel pipe is nested in the prestressed anchor cable channel of the original small mixed tower foundation, the middle steel pipe is welded to connect the upper steel pipe and the lower steel pipe, and the steering wheel includes a fixed shaft and a movable wheel, the movable wheel rotates around the fixed shaft to realize the direction transfer of the prestressed anchor cable tension.

9. The new cast-in-place pile foundation according to claim 8, wherein The prestressed anchor cable stress steering device further includes a sealing cover, which is used to prevent damage to the steering wheel during concrete pouring and provide protection against corrosion and environmental erosion; the sealing cover is made of high-strength composite material or corrosion-resistant metal.

10. The new cast-in-place pile foundation of the old cast-in-place pile foundation according to claim 1, characterized in that, The prestressed anchor cable channel of the original small mixed tower foundation is retained and recycled; the prestressed anchor cable in the new mixed tower foundation passes through the original anchor cable channel through the steering device and realizes effective direction transfer.

Images