Dry-connection grouting-free prefabricated foundation

Abstract

The utility model provides a dry connection grouting-free prefabricated assembly type foundation, which comprises a cushion layer and a plurality of groups of prefabricated parts which are annularly arranged, the prefabricated parts are arranged on the cushion layer, the plurality of groups of prefabricated parts are spliced to form a circular foundation, anchor bolt components which are connected with a tower tube switching section are arranged on the prefabricated parts, reinforcing ribs are arranged on the prefabricated parts, and the reinforcing ribs are arranged on the cushion layer. A plurality of groups of steel plates which are annularly arranged are further included, a plurality of groups of steel nails are arranged on the sides, facing the prefabricated parts, of the steel plates, an abutted seam is formed between every two adjacent prefabricated parts, the steel plates are arranged at the abutted seams, and the multiple groups of steel nails are arranged on the two adjacent prefabricated parts in a penetrating mode respectively. According to the fabricated foundation, through the arrangement of the steel plates and the steel nails, the multiple sets of prefabricated parts form a whole and bear the load of a draught fan together, the construction efficiency of the fabricated foundation is greatly improved, good universality is achieved, later maintenance is simpler, and the structural safety of the foundation is higher.

Description

Technical Field

[0001] This utility model relates to the field of wind turbine foundation technology, specifically to a dry-connected, grout-free prefabricated assembled foundation. Background Technology

[0002] Wind energy is a clean and pollution-free renewable energy source, and my country is currently vigorously developing its wind resources. The wind turbine foundation, as the fixed end of the wind turbine generator, together with the tower, erects the turbine at a height of over 100 meters and is a crucial component ensuring normal power generation. The wind turbine foundation accounts for approximately 5.8% of the total cost of wind farm construction, second only to the wind turbine generator, tower, and substation.

[0003] Secondly, almost all onshore wind turbine foundations today use traditional cast-in-place foundations, especially gravity spread foundations. However, the construction and maintenance cycles for this type of cast-in-place foundation are relatively long, usually requiring more than a month, and construction is difficult in winter. To some extent, this restricts the large-scale, intensive, and high-quality development of wind power generation.

[0004] Furthermore, current precast foundations, both domestically and internationally, are mainly connected using methods such as semi-cast-in-place / semi-precast construction and prestressed reinforcement. These precast foundations may have drawbacks such as difficulties in later maintenance, limited improvement in construction efficiency, and relatively weak structural safety. Therefore, this paper proposes a dry-connection, grout-free precast foundation to address the aforementioned technical problems. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model proposes a dry-connection, grout-free precast assembled foundation. This addresses the technical problems mentioned in the background section, where existing precast assembled foundations are mainly connected through semi-cast-in-place, semi-precast, or prestressed reinforcement methods. These precast assembled foundations suffer from difficulties in later maintenance, minimal improvement in construction efficiency, and weak structural safety.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a dry-connected, grout-free prefabricated assembled foundation, comprising:

[0007] Subbase;

[0008] Precast components, arranged in multiple sets circumferentially, are placed on the cushion layer, and the multiple sets of precast components are spliced ​​to form a circular foundation. Each precast component is equipped with an anchor bolt assembly for connection to the tower transition section, and reinforcing ribs are provided on the precast component.

[0009] The steel plate is arranged in multiple groups around the perimeter. Multiple groups of steel nails are provided on the side of the steel plate facing the precast component. There is a joint between each pair of adjacent precast components. The steel plate is placed at the joint, and the multiple groups of steel nails are respectively inserted into the adjacent pairs of precast components.

[0010] In a preferred embodiment, multiple sets of steel plates are arranged circumferentially and spliced ​​to form an inner cylinder and an outer cylinder, with the inner cylinder fitting against the inner side of the circular foundation and the outer cylinder fitting against the outer side of the circular foundation.

[0011] In a preferred embodiment, each pair of adjacent steel plates is fixed by welding.

[0012] In a preferred embodiment, the steel nail is fixed to the steel plate by welding.

[0013] In a preferred embodiment, a layer of fine sand is laid between the bottom of the circular foundation and the padding layer.

[0014] In a preferred embodiment, the prefabricated component is provided with a enclosure, and the enclosures in two adjacent sets of prefabricated components cooperate with the two sets of reinforcing ribs to form a receiving cavity.

[0015] In a preferred embodiment, epoxy resin is injected into the joint.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] This prefabricated assembly foundation is a beam-slab type foundation, assembled from several prefabricated components, steel plate-steel nail assemblies, and other components. Steel nails are pre-embedded into the prefabricated component columns through binding, while steel plates are located at the joints. The arrangement of steel plates and steel nails allows multiple prefabricated components to form a unified whole, jointly bearing the wind turbine load. The foundation joints use a dry connection method, where the shear force at the joints is mainly borne by the steel plates located at the joints, fitting against the inner and outer sides of the columns, and the steel nails pre-embedded in the columns. This eliminates the need for on-site reinforcement binding and pouring, greatly improving the construction efficiency of the prefabricated foundation, offering good versatility, simplifying later maintenance, and enhancing the structural safety of the foundation.

[0018] No grouting is required between the foundation slab and the bedding layer. The gap between the foundation slab and the bedding layer is paved with a layer of fine sand to ensure the tightness between the foundation and the bedding layer. Furthermore, there is no need to tie steel bars or pour concrete on site at the joints. Only epoxy resin needs to be injected evenly to ensure that each prefabricated component is tightly bonded. Epoxy resin has good low-temperature performance and the material has a short winter curing time, which ensures that the prefabricated foundation can be constructed in winter, thus improving the construction efficiency of wind power projects. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of this utility model, the accompanying drawings used in the specific embodiments will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to scale.

[0020] Figure 1 A cross-sectional view of a dry-connected, grout-free prefabricated assembled foundation provided by this utility model;

[0021] Figure 2 This is a top view of a dry-connected, grout-free prefabricated assembly foundation according to the present invention.

[0022] Figure 3 This is a schematic diagram of the prefabricated components in a dry-connected, grout-free prefabricated assembled foundation according to this utility model.

[0023] Figure 4 This is a side view of a prefabricated component in the first embodiment of a dry-connected, grout-free prefabricated assembled foundation according to the present invention.

[0024] Figure 5 This is a side view of a prefabricated component in the second embodiment of a dry-connected, grout-free prefabricated assembly foundation according to the present invention.

[0025] Figure label:

[0026] 1. Steel plate; 2. Steel nails; 3. Anchor bolt assembly; 4. Fine sand layer; 5. Joint; 6. Precast component; 7. Reinforcing rib; 8. Fence; 9. Subbase. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention. Those skilled in the art can make some non-essential improvements and adjustments to the present invention based on the above application content.

[0028] Example:

[0029] like Figures 1 to 4 As shown, this utility model provides a dry-connection, grout-free prefabricated assembly foundation. The connection structure of this assembly foundation is suitable for steel tower foundations and also for mixed tower foundations. It includes a cushion layer 9 and multiple sets of circumferentially arranged prefabricated components 6. The prefabricated components 6 are placed on the cushion layer 9 and are equipped with anchor bolt assemblies 3 that connect to the tower transition section. The prefabricated components 6 also have reinforcing ribs 7. Furthermore, it includes multiple sets of circumferentially arranged steel plates 1. Multiple sets of steel nails 2 are provided on the side of the steel plates 1 facing the prefabricated components 6. There is a joint 5 between each pair of adjacent prefabricated components 6. The steel plates 1 are located at the joint 5, and the multiple sets of steel nails 2 are respectively inserted into the adjacent pairs of prefabricated components 6.

[0030] Multiple sets of prefabricated components 6 are spliced ​​together to form a circular foundation, and multiple sets of steel plates 1 are arranged at the joints 5 of adjacent sets of prefabricated components 6. Multiple sets of steel nails 2 on each set of steel plates 1 are inserted into the prefabricated components 6, so that multiple sets of prefabricated components 6 form a whole. There is no need to tie steel bars and pour concrete, which greatly saves construction time and cost.

[0031] like Figure 1 , 2 As shown, in this embodiment, multiple sets of steel plates 1 are arranged circumferentially and spliced ​​to form an inner cylinder and an outer cylinder. The inner cylinder is fitted to the inner side of the circular foundation, and the outer cylinder is fitted to the outer side of the circular foundation. By arranging the inner and outer cylinders, the strength between the multiple sets of prefabricated components 6 can be enhanced. Furthermore, steel nails 2 are fixed to the steel plates 1 by welding. Each pair of adjacent sets of steel plates 1 is fixed by welding, making the inner and outer cylinders form a whole, further increasing the structural strength and improving the load-bearing capacity. Epoxy resin is injected into the joints 5. This material has good low-temperature resistance and a fast strength-building rate, allowing the multiple sets of prefabricated components 6 to quickly form a whole.

[0032] like Figure 1 As shown, in this embodiment, a fine sand layer 4 is laid between the bottom of the circular foundation and the pad 9, so that no grouting is required between the foundation base plate and the pad 9. The gap between the foundation base plate and the pad 9 is filled with fine sand to ensure the tightness between the foundation and the pad 9, saving the grouting material of the base plate and improving the construction efficiency.

[0033] like Figure 1 , 5 As shown, in this embodiment, a retaining wall 8 is provided on the precast component 6, and the retaining walls 8 in two adjacent sets of precast components 6, together with two sets of reinforcing ribs 7, form a receiving cavity. In a preferred embodiment, the inner and outer sides of the reinforcing ribs 7 are at the same height, thereby maximizing the capacity of the receiving cavity, allowing backfill soil to be filled into the cavity. The retaining wall 8 and the foundation pit soil form a structure similar to a retaining wall. There is friction and earth pressure between the retaining wall 8 and the foundation pit soil, which can improve the overturning resistance of the foundation, thereby reducing the foundation diameter and the land acquisition area.

[0034] The specific usage and beneficial effects of this utility model are as follows:

[0035] This prefabricated assembly foundation is a beam-slab type foundation, assembled from several prefabricated components 6, steel plates 1, and steel nails 2. The steel nails 2 are pre-embedded into the columns of the prefabricated components 6 through binding. The steel plates 1 are located at the joint 5. The arrangement of the steel plates 1 and steel nails 2 allows multiple sets of prefabricated components 6 to form a whole, jointly bearing the wind turbine load. The joint 5 of the foundation uses a dry connection method. The shear force at the joint 5 is mainly borne by the steel plates 1 located at the joint 5, attached to the inner and outer sides of the column, and the steel nails 2 pre-embedded in the column. This eliminates the need for on-site reinforcement binding and pouring, greatly improving the construction efficiency of the prefabricated foundation, and it has good versatility, simpler maintenance, and stronger structural safety.

[0036] No grouting is required between the foundation slab and the bedding layer 9. The gap between the foundation slab and the bedding layer 9 is paved with a layer of fine sand 4 to ensure the tightness between the foundation and the bedding layer 9. Furthermore, no on-site reinforcement binding or concrete pouring is required at the joints 5. Only epoxy resin needs to be injected evenly to ensure that all prefabricated components 6 are tightly bonded. Epoxy resin has good low-temperature performance and a short winter curing time, thus ensuring that the prefabricated foundation can be constructed in winter and improving the construction efficiency of wind power projects.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above. Modifications or improvements can be made to this utility model, which is obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of this utility model fall within the scope of protection claimed by this utility model.

Claims

1. A dry-connected, grout-free prefabricated assembled foundation, characterized in that, Including: Subbase (9); Precast components (6) are arranged in multiple sets around the circumference and are placed on the cushion layer (9). The multiple sets of precast components (6) are spliced ​​to form a circular foundation. Anchor bolt assemblies (3) connected to the tower transition section are provided on the precast components (6). Reinforcing ribs (7) are provided on the precast components (6). A steel plate (1) is arranged in multiple sets around the perimeter. Multiple sets of steel nails (2) are provided on the side of the steel plate (1) facing the precast component (6). There is a joint (5) between each two adjacent sets of the precast components (6). The steel plate (1) is located at the joint (5), and the multiple sets of steel nails (2) are respectively inserted on the two adjacent sets of the precast components (6).

2. The prefabricated assembled foundation with dry connection and no grouting as described in claim 1, characterized in that: Multiple sets of steel plates (1) are arranged in a circumferential direction and spliced ​​to form an inner cylinder and an outer cylinder. The inner cylinder is attached to the inner side of the circular foundation, and the outer cylinder is attached to the outer side of the circular foundation.

3. The prefabricated assembled foundation with dry connection and no grouting as described in claim 2, characterized in that: Each pair of adjacent steel plates (1) are fixed by welding.

4. The prefabricated assembled foundation with dry connection and no grouting as described in claim 1, characterized in that: The steel nail (2) is fixed to the steel plate (1) by welding.

5. A dry-connected, grout-free prefabricated assembled foundation according to claim 1, characterized in that: A layer of fine sand (4) is laid between the bottom of the circular foundation and the padding layer (9).

6. A prefabricated assembled foundation with dry connection and no grouting as described in claim 1, characterized in that: The prefabricated component (6) is provided with a enclosure (8), and the enclosures (8) in two adjacent sets of prefabricated components (6) cooperate with two sets of reinforcing ribs (7) to form a receiving cavity.

7. A dry-connection, grout-free prefabricated assembled foundation according to claim 1, characterized in that: Epoxy resin is injected into the seam (5).

Images