An electrical power storage underground chamber lining structure

Abstract

The utility model discloses a kind of electric power storage underground chamber lining structure, including flexible sealing layer, combined lining and initial support being sequentially arranged from inside to outside along chamber radial direction, combined lining includes rigid section and flexible section being alternately connected, rigid section is formed by ordinary concrete pouring, flexible section is formed by ECC concrete pouring, steel bar is connected and arranged between adjacent rigid section and flexible section, buffer is arranged between flexible section and initial support, initial support is arranged in surrounding rock, surrounding rock, initial support and combined lining are connected by anchor rod. The electric power storage underground chamber lining structure adopts combined lining, can realize large deformation, limit the maximum crack width of lining, not only can prevent flexible sealing layer from being damaged by falling into the crack of lining, but also can transmit chamber pressure to surrounding rock through the deformation of lining, meet the energy storage needs of electric power storage underground chamber under poor surrounding rock conditions, widen the application range of electric power storage underground chamber.

Description

Technical Field

[0001] This utility model relates to the field of compressed air energy storage (i.e., compressed air energy storage), specifically to a lining structure for an underground power storage chamber. Background Technology

[0002] Compressed air underground chambers, as a type of underground power storage chamber, utilize surplus electricity (especially wind and solar power) to store electrical energy in compressed air during off-peak periods and release it to generate electricity during peak periods, thus achieving large-scale time shifting of electrical energy, effectively shaving peaks and filling valleys, and smoothing load fluctuations.

[0003] The existing compressed air underground chamber structure consists of, from the inside out, a sealing layer (steel plate or rubber), a lining (ordinary reinforced concrete), and initial support (plain concrete). The sealing layer ensures the chamber's airtightness; the lining transfers the internal air pressure of the sealing layer to the surrounding rock, thereby utilizing the bearing capacity of the surrounding rock; the initial support is externally connected to the inner wall of the surrounding rock and internally connected to the lining via evenly distributed anchor bolts.

[0004] The existing problems with compressed air underground chambers are as follows: 1) When the surrounding rock conditions are poor, the structure deforms significantly in order to transfer the internal pressure to the surrounding rock. When steel plates are used as the sealing layer of the chamber, thicker steel plates are usually required to meet the requirements, which is not economical. 2) When flexible materials such as rubber are used as the sealing layer of the chamber, they have good deformation capacity and the internal pressure transfer requirement can be met with a very thin sealing layer. However, due to the large deformation, large cracks will appear in the concrete lining, and the steel bars will yield, so the structural safety and durability of the chamber cannot be guaranteed. 3) When the crack width is too large, the sealing layer will sink into the cracks in the lining under the action of internal pressure and be destroyed, so the sealing performance of the chamber cannot be guaranteed. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a lining structure for an underground power storage chamber that addresses the shortcomings of the existing technology. This structure not only prevents the flexible sealing layer from sinking into cracks in the lining and causing damage, but also transfers the chamber pressure to the surrounding rock through the deformation of the lining, thus meeting the energy storage needs of the underground power storage chamber when the surrounding rock conditions are poor.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a lining structure for an underground power storage chamber, comprising a flexible sealing layer, a combined lining, and an initial support arranged sequentially from the inside to the outside along the radial direction of the chamber. The combined lining comprises alternating rigid sections and flexible sections. The rigid sections are cast from ordinary concrete, and the flexible sections are cast from ECC concrete. Reinforcing bars are provided between adjacent rigid sections and flexible sections. A buffer is provided between the flexible sections and the initial support. The initial support is located within the surrounding rock. The surrounding rock, the initial support, and the combined lining are connected by anchor bolts.

[0007] This utility model's chamber structure uses a composite lining instead of the traditional monolithic reinforced concrete lining. This composite lining comprises alternating rigid and flexible sections, with the flexible sections constructed of ECC concrete. Because ECC concrete has strong deformation capacity and only produces fine, dense cracks (≤100μm) under tension, it can achieve large deformation while limiting the maximum crack width of the lining. This not only prevents the flexible sealing layer from sinking into the lining cracks and causing damage, but also allows the chamber pressure to be transferred to the surrounding rock through lining deformation, meeting the energy storage needs of underground power storage chambers in areas with poor surrounding rock conditions. Furthermore, the buffer material ensures that the flexible section deforms circumferentially and prevents radial depression, further ensuring the effectiveness of the flexible section.

[0008] Preferably, adjacent rigid and flexible sections are connected by a mortise and tenon structure to prevent the lining section at the junction of the rigid and flexible sections from being damaged by radial relative displacement under shear force.

[0009] Preferably, the flexible section is cast from ECC concrete incorporating polyethylene fibers to achieve better deformation capacity.

[0010] Preferably, the circumferential width of the outer radial side of the flexible section is greater than the circumferential width of its inner radial side. This ensures that large deformations and cracks in the overall lining structure are concentrated in the flexible section, reducing the deformation of the rigid section, thereby preventing cracks in the rigid section and avoiding steel bar yielding.

[0011] Preferably, the reinforcing bars include bottom bars and top bars, with the top bars spaced apart on the radially outer side of the bottom bars. The bottom bars and the top bars are connected to adjacent rigid and flexible sections by anchoring end bars, respectively, to achieve a semi-closed connection of each component of the composite lining. This ensures that each component of the composite lining can be tightly connected while also giving full play to the high ductility of the flexible sections.

[0012] Preferably, the buffer is a rubber block, which is embedded on the radially outer side of the flexible segment.

[0013] Preferably, the flexible sealing layer is a flexible sealing layer made of a polymer material, such as butyl rubber, natural rubber, or EPDM rubber.

[0014] Preferably, the initial support is made of sprayed concrete, which helps to reinforce the surrounding rock, allowing the initial support to work together with the surrounding rock and improve the stability of the surrounding rock.

[0015] Preferably, the anchor bolts are distributed near the junction of the rigid section and the flexible section. This non-uniform arrangement of the anchor bolts can not only support and reinforce the surrounding rock, but also further prevent the rigid section and the flexible section from shifting, thereby avoiding damage to the flexible sealing layer.

[0016] Compared with existing technologies, this utility model has the following advantages: The lining structure of the underground power storage chamber of this utility model adopts a composite lining, and its flexible section is made of ECC concrete. Because ECC concrete has strong deformation capacity and only produces fine and dense cracks (≤100μm) under tension, it can achieve large deformation while limiting the maximum crack width of the lining. This not only prevents the flexible sealing layer from sinking into the cracks of the lining and causing damage, but also allows the chamber pressure to be transferred to the surrounding rock through the deformation of the lining, meeting the energy storage needs of underground power storage chambers in areas with poor surrounding rock conditions and broadening the application range of underground power storage chambers. Furthermore, the buffer material ensures that the flexible section deforms along the circumferential direction and prevents the flexible section from sinking radially, further ensuring the effectiveness of the flexible section. Attached Figure Description

[0017] Figure 1 This is a schematic cross-sectional view of the chamber structure in the embodiment;

[0018] Figure 2 This is a schematic cross-sectional view of the combined lining in the embodiment;

[0019] Figure 3 This is a schematic diagram of the reinforcing bars on the cross-section of the chamber structure in the embodiment;

[0020] The specific reference numerals in the figure are as follows:

[0021] 1-Flexible sealing layer, 2-Combined lining, 21-Rigid section, 22-Flexible section, 3-Initial support, 4-Reinforcing steel, 41-Bottom reinforcement, 42-Top reinforcement, 43-Anchoring end reinforcement, 5-Buffer material, 6-Anchor rod. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0023] The embodiment of the underground power storage chamber lining structure, such as Figures 1-3As shown, the structure includes a flexible sealing layer 1, a composite lining 2, and an initial support 3 arranged radially from the inside to the outside of the chamber. The composite lining 2 includes alternating rigid sections 21 and flexible sections 22. The rigid sections 21 are made of ordinary concrete, and the flexible sections 22 are made of ECC concrete mixed with polyethylene fibers. The circumferential width of the outer radial side of the flexible section 22 is greater than the circumferential width of its inner radial side. Adjacent rigid sections 21 and flexible sections 22 are connected by mortise and tenon joints, and steel bars 4 are connected between adjacent rigid sections 21 and flexible sections 22. A buffer 5 is provided between the flexible section 22 and the initial support 3. The initial support 3 is located in the surrounding rock (not shown in the figure) and is made of sprayed concrete. The surrounding rock, the initial support 3, and the composite lining 2 are connected by anchor bolts 6, which are distributed near the junction of the rigid sections 21 and the flexible sections 22.

[0024] In this embodiment, the reinforcing bar 4 includes a bottom bar 41 and a top bar 42. The top bars 42 are spaced apart on the radial outer side of the bottom bar 41. The bottom bar 41 and the top bars 42 are connected to adjacent rigid sections 21 and flexible sections 22 by anchoring end reinforcing bars 43, respectively.

[0025] In this embodiment, the buffer 5 is a rubber block, which is embedded on the radial outer side of the flexible segment 22.

[0026] In this embodiment, the flexible sealing layer 1 is a flexible sealing layer 1 made of butyl rubber.

[0027] After the aforementioned underground power storage chamber lining structure is put into use, the flexible sealing layer 1 transfers the internal pressure of the chamber to the composite lining 2. The flexible section 22 in the composite lining 2 undergoes large deformation, thereby transferring the chamber pressure to the surrounding rock. Simultaneously, the large deformation of the flexible section 22 limits the maximum crack width of the lining, preventing the flexible sealing layer 1 from sinking into cracks and causing damage, and avoiding shear failure of the flexible sealing layer 1. The buffer 5 ensures that the flexible section 22 deforms circumferentially and prevents radial indentation, further ensuring the effectiveness of the flexible section 22. The bottom reinforcement 41 and the top reinforcement 42 ensure a tight connection between the components of the composite lining 2 while also leveraging the high ductility of the flexible section 22. The non-uniformly arranged anchor bolts 6 not only support and reinforce the surrounding rock but also further prevent misalignment between the rigid section 21 and the flexible section 22, thus avoiding damage to the flexible sealing layer 1.

Claims

1. A lining structure for an underground power storage chamber, characterized in that, The structure includes a flexible sealing layer, a composite lining, and an initial support arranged radially from the inside to the outside of the chamber. The composite lining includes alternating rigid and flexible sections. The rigid sections are made of ordinary concrete, and the flexible sections are made of ECC concrete. Reinforcing bars are installed between adjacent rigid and flexible sections. A buffer is installed between the flexible sections and the initial support. The initial support is located within the surrounding rock. The surrounding rock, the initial support, and the composite lining are connected by anchor bolts.

2. The lining structure for an underground power storage chamber according to claim 1, characterized in that, Adjacent rigid and flexible sections are connected by mortise and tenon joints.

3. The lining structure for an underground power storage chamber according to claim 1, characterized in that, The flexible section is made of ECC concrete mixed with polyethylene fibers.

4. The lining structure for an underground power storage chamber according to claim 1, characterized in that, The circumferential width of the outer radial side of the flexible segment is greater than the circumferential width of its inner radial side.

5. The lining structure for an underground power storage chamber according to claim 1, characterized in that, The reinforcing bars include bottom bars and top bars. The top bars are spaced apart on the radial outer side of the bottom bars. The bottom bars and the top bars are connected to adjacent rigid and flexible sections by anchoring end bars, respectively.

6. The lining structure of an underground power storage chamber according to claim 1, characterized in that, The buffer is a rubber block, which is embedded on the radial outer side of the flexible segment.

7. The lining structure for an underground power storage chamber according to claim 1, characterized in that, The flexible sealing layer is made of polymer material.

8. The lining structure of an underground power storage chamber according to claim 1, characterized in that, The initial support was formed by spraying concrete.

9. The lining structure of an underground power storage chamber according to claim 1, characterized in that, The anchor bolts are distributed near the junction of the rigid section and the flexible section.

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