Flywheel energy storage device composite foundation for sand and gravel ground

Abstract

The utility model belongs to the field of building construction technology, concretely relates to a flywheel energy storage device composite foundation for sand and stone land, including CFG pile, composite vibration isolation layer, first raft foundation, underground wall, support beam, second raft foundation, CFG pile is vertically set in the bottom of the wiring cavity that opens in construction site, first raft foundation sets up in the bottom of wiring cavity, and first raft foundation is located the upper of CFG pile, underground wall sets up in the both sides of wiring cavity, support beam sets up in the top of underground wall, and with underground wall vertical setting, second raft foundation, composite vibration isolation layer all set up in the construction site except wiring cavity, and second raft foundation is located the upper of composite vibration isolation layer, composite vibration isolation layer includes sand and stone cushion layer, geogrid layer, vibration isolation material layer from below to above in proper order. The utility model through the composite structure of rigid bearing platform and composite vibration isolation layer, realizes dynamic and static load collaborative control, protects the stability of upper flywheel energy storage equipment.

Description

Technical Field

[0001] This utility model belongs to the field of building construction technology, specifically relating to a composite foundation for a flywheel energy storage device for sandy and gravelly soil. Background Technology

[0002] Currently, the treatment of loose foundations such as sand and gravel mainly involves vibration or impact drilling to force crushed stone and sand into the weak soil layer, forming dense piles to significantly improve the bearing capacity of the foundation and reduce settlement. Because flywheel energy storage systems have high requirements for resisting dynamic loads, when installing above-ground flywheel energy storage devices in sandy and gravelly areas, foundation treatment must consider core requirements such as bearing capacity improvement, dynamic load absorption, and vibration isolation. Current mainstream foundation treatment methods mostly adopt composite foundation structures, effectively improving the bearing capacity of the foundation by setting crushed stone piles and concrete raft slabs, which can be used for general power equipment. However, directly applying this to flywheel energy storage devices has the following shortcomings: first, the effect on suppressing high-frequency micro-vibrations generated during flywheel operation is limited; second, the matching problem between the flywheel operating frequency and the natural frequency of the foundation is not fully considered, posing a resonance risk; and third, the torsional design redundancy is insufficient for the huge torque generated during flywheel failure. Summary of the Invention

[0003] The purpose of this invention is to address the aforementioned problems in the existing technology by providing a composite foundation for flywheel energy storage devices on sandy and gravelly soil, which achieves coordinated control of dynamic and static loads through a composite structure of a rigid support and a composite vibration isolation layer.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] A composite foundation for a flywheel energy storage device on gravelly soil includes CFG piles, a composite vibration isolation layer, a first raft foundation, an underground wall, a support beam, and a second raft foundation. The CFG piles are vertically driven into the bottom of a wiring cavity opened on the construction site. The first raft foundation is located at the bottom of the wiring cavity and above the CFG piles. The underground wall is located on both sides of the wiring cavity. The support beam is located on top of the underground wall and is perpendicular to the underground wall. The second raft foundation and the composite vibration isolation layer are both located on the construction site excluding the wiring cavity, and the second raft foundation is located above the composite vibration isolation layer. The composite vibration isolation layer, from bottom to top, includes a gravel cushion layer, a geogrid layer, and a vibration isolation material layer. The vibration isolation material is a high-damping rubber pad or cork.

[0006] Preferably, the CFG pile is formed by casting a mixture of crushed stone, fly ash and cement.

[0007] Preferably, the gravel particle size in the CFG pile is 20-30mm.

[0008] Preferably, the number of CFG piles is at least 6 and they are arranged in a figure-eight pattern below the flywheel energy storage device.

[0009] Preferably, the sand and gravel cushion layer is made of sand and gravel with a graded particle size of 5-50mm and a mud content of ≤3%.

[0010] Preferably, the thickness of the sand and gravel cushion layer is 200-350mm.

[0011] Preferably, the thickness of the vibration isolation material layer is 2-3 mm.

[0012] Preferably, both the first raft foundation and the second raft foundation are constructed using concrete of strength grade C35 or higher.

[0013] Preferably, both the first and second raft foundations are constructed using double-layer bidirectional steel reinforcement mesh. The thickness of the double-layer bidirectional steel reinforcement mesh in the first raft foundation is 30-50cm, and the thickness of the double-layer bidirectional steel reinforcement mesh in the second raft foundation is 10-20cm. The diameter of the steel bars in the double-layer bidirectional steel reinforcement mesh is not less than 16mm, and the spacing between the steel bars is 150-200mm.

[0014] Preferably, the support beam has embedded parts, which are anchor bolts or anchor plates.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] The composite foundation for the flywheel energy storage device described in this utility model provides vertical bearing capacity through a rigid bearing platform, which includes a first raft foundation, support beams, underground walls, a second raft foundation, and CFG piles. Furthermore, a composite vibration isolation layer composed of graded crushed stone, grid, and rubber granules is laid before the concrete pouring of the second raft foundation. This layer absorbs vibration energy through shear deformation, avoiding resonance caused by rigid contact, thereby achieving coordinated control of dynamic and static loads. This protects the stability of the upper flywheel energy storage device and ultimately significantly improves the operational stability, safety, and service life of the flywheel energy storage device. Attached Figure Description

[0017] Figure 1 This is an elevation plan view of the composite foundation mentioned in this utility model.

[0018] Figure 2 for Figure 1 Sectional view from direction 1-1.

[0019] Figure 3 for Figure 1 CC-direction cross-section.

[0020] In the diagram above, the components are: 1. Wiring cavity; 2. CFG pile; 3. Composite vibration isolation layer; 4. First raft foundation; 5. Underground wall; 6. Support beam; 7. Second raft foundation. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0022] See Figures 1 to 3 A composite foundation for a flywheel energy storage device on gravelly soil includes CFG piles 2, a composite vibration isolation layer 3, a first raft foundation 4, an underground wall 5, a support beam 6, and a second raft foundation 7. The CFG piles 2 are vertically driven into the bottom of a wiring cavity 1 opened on the construction site. The first raft foundation 4 is located at the bottom of the wiring cavity 1 and is above the CFG piles 2. The underground wall 5 is located on both sides of the wiring cavity 1. The support beam 6 is located on the top of the underground wall 5 and is perpendicular to the underground wall 5. The second raft foundation 7 and the composite vibration isolation layer 3 are both located on the construction site other than the wiring cavity 1, and the second raft foundation 7 is located above the composite vibration isolation layer 3. The composite vibration isolation layer 3 includes, from bottom to top, a gravel cushion layer, a geogrid layer, and a vibration isolation material layer. The vibration isolation material is a high-damping rubber pad or cork.

[0023] The aforementioned flywheel energy storage device composite foundation provides vertical bearing capacity through a rigid cap formed by a first raft foundation, support beams, underground walls, a second raft foundation, and CFG piles. Before pouring the concrete for the second raft foundation, a composite vibration isolation layer composed of graded crushed stone, geogrid, and rubber granules is laid. This layer absorbs vibration energy through shear deformation, preventing resonance caused by rigid contact, thus achieving coordinated control of dynamic and static loads. The flywheel energy storage device composite foundation can be obtained according to the following construction steps:

[0024] Step 1: Use a vibratory roller to initially compact the construction site to level it; and excavate a wiring cavity 1 on the construction site.

[0025] Step 2: First, use a dynamic compaction machine to perform spot compaction at preset intervals on the construction site using a skip compaction method, and then perform full compaction, with the hammer marks overlapping each other, to compact the surface soil of the construction site.

[0026] Step 3: Cast CFG pile 2 at the bottom of wiring cavity 1, with steel bars pre-installed at the top of CFG pile 2;

[0027] Step 4: Lay the composite vibration isolation layer 3 on the construction site, excluding the wiring cavity 1;

[0028] Step 5: First, pour the first raft foundation 4 at the bottom of the wiring cavity 1. The first raft foundation 4 is connected to the CFG pile 2 by the reserved steel bars. Then, pour the underground wall 5 on both sides of the wiring cavity 1. Pour the support beam 6 on the top of the underground wall 5. The underground wall 5 and the support beam 6 are poured in one go. Then, pour the second raft foundation 7 on the construction site other than the wiring cavity 1. After pouring, cure until the settlement is stable.

[0029] Step Six: After curing, ensure the top surface flatness of the composite foundation meets the installation requirements of the flywheel energy storage device. The general installation requirements for flywheel energy storage devices are as follows: 1. The concrete strength of the foundation for outdoor flywheel energy storage equipment should not be less than 30MPa to ensure the foundation's vibration resistance. Insufficient foundation strength may cause vibration to be transmitted to the structure during equipment operation, affecting stability. 2. The horizontal flatness of the flywheel energy storage device's foundation should be less than 3mm, and the tilt angle should not exceed 3°. This standard ensures that the equipment avoids stress concentration or increased vibration in the mechanical structure due to horizontal deviation during operation. 3. The lifting tilt angle should not exceed 3°, the hook should be aligned with the center of the equipment, and the angle between the sling and the plumb line should not exceed 30°. If these requirements are not met, a special crossbeam should be used for lifting. 4. Other construction and installation requirements should meet the "Construction and Acceptance Specification for Flywheel Energy Storage Power Stations" T / LPEA 001-2025 and "Selection and Installation of Flywheel Energy Storage Systems" 22CD202-6.

[0030] In another embodiment, the CFG pile 2 is formed by first drilling a hole using a vibratory pipe-driving method, then filling the hole with a mixture of crushed stone, fly ash, and cement in layers, and finally compacting each layer to a preset elevation using a vibratory compactor before casting. Compared to ordinary crushed stone piles, the CFG pile 2 is harder, which can better improve the bearing capacity and stiffness of the foundation, and provides a drainage path through the pores inside the CFG pile 2, thus having better drainage capacity.

[0031] In another embodiment, at least six CFG piles 2 are arranged in a figure-eight pattern below the flywheel energy storage device. The CFG piles 2 have a diameter of 500mm and a spacing of 2.0m. The presence of at least six CFG piles 2 assists in bearing capacity, thus improving foundation stability. Preferably, at least three CFG piles 2 on one side and at least three CFG piles 2 on the other side (i.e.,...) Figure 1 The distance between section line AA and section line BB is 215cm.

[0032] In another embodiment, the particle size of the crushed stone in the mixture of crushed stone, fly ash and cement is 20-30 mm.

[0033] In another embodiment, the sand and gravel cushion layer is made of sand and gravel with a graded particle size of 5-50mm and a mud content of ≤3%. The sand and gravel cushion layer serves to diffuse stress and level the ground; then, 1-2 layers of geogrid are laid on the sand and gravel cushion layer to enhance the integrity of the foundation.

[0034] In another embodiment, the thickness of the sand and gravel cushion layer is 200-350mm.

[0035] In another embodiment, the thickness of the vibration isolation material layer is 2-3 mm to ensure the suppression effect on the high-frequency micro-vibrations generated during the operation of the flywheel energy storage device.

[0036] In another embodiment, both the first raft foundation 4 and the second raft foundation 7 are constructed using concrete of strength grade C35 or higher to ensure the quality of the concrete pouring.

[0037] In another embodiment, both the first raft foundation 4 and the second raft foundation 7 are constructed based on a double-layer bidirectional steel mesh. The double-layer bidirectional steel mesh refers to two layers of steel bars (upper and lower) arranged along two orthogonal directions (usually the X and Y directions), forming a two-layer, bidirectional steel mesh that shares the load, enhancing the torsional and shear resistance of the raft foundation. Preferably, the thickness of the double-layer bidirectional steel mesh in the first raft foundation 4 is 30-50 cm, and the thickness of the double-layer bidirectional steel mesh in the second raft foundation 7 is 10-20 cm. The diameter of the steel bars in the double-layer bidirectional steel mesh is not less than 16 mm, and the spacing between the steel bars is 150-200 mm.

[0038] In another embodiment, embedded parts, such as anchor bolts or anchor plates, are pre-embedded in the support beams 6. Preferably, the two outermost support beams 6 (i.e. Figure 1 The distance between section line 1-1 and section line 2-2 is 420cm. After curing, the position of the embedded parts needs to be checked to ensure that they meet the installation requirements of the flywheel energy storage device. After the composite foundation construction is completed, the flywheel energy storage device is hoisted, precisely leveled and aligned, and then the flywheel energy storage device is tightened to the anchor bolts embedded in the support beam 6 or welded to the anchor plate.

Claims

1. A composite foundation for a flywheel energy storage device in sandy or gravelly soil, characterized in that: The composite foundation of the flywheel energy storage device includes CFG piles (2), a composite vibration isolation layer (3), a first raft foundation (4), an underground wall (5), a support beam (6), and a second raft foundation (7). The CFG piles (2) are vertically driven into the bottom of the wiring cavity (1) opened on the construction site. The first raft foundation (4) is set at the bottom of the wiring cavity (1) and is located above the CFG piles (2). The underground wall (5) is set on both sides of the wiring cavity (1). The support beam (6) is set at the top of the underground wall (5) and is set perpendicular to the underground wall (5). The second raft foundation (7) and the composite vibration isolation layer (3) are both set on the construction site other than the wiring cavity (1). The second raft foundation (7) is located above the composite vibration isolation layer (3). The composite vibration isolation layer (3) includes a sand and gravel cushion layer, a geogrid layer, and a vibration isolation material layer from bottom to top. The vibration isolation material is a high-damping rubber pad or cork.

2. The composite foundation for a flywheel energy storage device in gravelly soil according to claim 1, characterized in that: The CFG pile (2) is formed by casting a mixture of crushed stone, fly ash and cement.

3. The composite foundation for a flywheel energy storage device in gravelly soil according to claim 2, characterized in that: The crushed stone in the CFG pile (2) has a particle size of 20-30mm.

4. A composite foundation for a flywheel energy storage device in gravelly soil as described in claim 2 or 3, characterized in that: The number of CFG piles (2) is at least 6 and they are arranged in a figure-eight shape below the flywheel energy storage device.

5. A composite foundation for a flywheel energy storage device in gravelly soil according to any one of claims 1-3, characterized in that: The sand and gravel cushion layer is made of sand and gravel with a graded particle size of 5-50mm and a mud content of ≤3%.

6. A composite foundation for a flywheel energy storage device in gravelly soil according to any one of claims 1-3, characterized in that: The thickness of the sand and gravel cushion layer is 200-350mm.

7. A composite foundation for a flywheel energy storage device in gravelly soil according to any one of claims 1-3, characterized in that: The thickness of the vibration isolation material layer is 2-3 mm.

8. A composite foundation for a flywheel energy storage device in gravelly soil according to any one of claims 1-3, characterized in that: Both the first raft foundation (4) and the second raft foundation (7) are constructed using concrete of strength grade C35 or higher.

9. A composite foundation for a flywheel energy storage device in gravelly soil according to any one of claims 1-3, characterized in that: The first raft foundation (4) and the second raft foundation (7) are both based on the casting of double-layer bidirectional steel mesh. The thickness of the double-layer bidirectional steel mesh in the first raft foundation (4) is 30-50cm, and the thickness of the double-layer bidirectional steel mesh in the second raft foundation (7) is 10-20cm. The diameter of the steel bars in the double-layer bidirectional steel mesh is not less than 16mm, and the spacing between the steel bars is 150-200mm.

10. A composite foundation for a flywheel energy storage device in gravelly soil according to any one of claims 1-3, characterized in that: The support beam (6) has embedded parts, which are anchor bolts or anchor plates.

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