A sub-block type supporting structure of compressed air energy storage underground cavern and a construction method thereof

Abstract

The present application relates to the field of underground cavern supporting structure. More particularly, the present application relates to a block type supporting structure and construction method of compressed air energy storage underground cavern. The present application provides a block type supporting structure and construction method of compressed air energy storage underground cavern, which is suitable for the structure design of compressed air energy storage underground cavern, and can also be widely applied to the structure design of high pressure underground cavern.

Description

Technical Field

[0001] The present invention relates to the field of underground cavern support structures. More specifically, the present invention relates to a block-type support structure and construction method for a compressed air energy storage underground cavern. Background Art

[0002] As compressed air energy storage technology matures, the design of gas storage facilities has become crucial for the construction of compressed air energy storage power plants. Above-ground gas storage facilities often use metal pressure vessels or other material gas storage silos as gas storage devices. However, these pressure vessels are expensive, occupy a large area, and have limited storage capacity. Underground artificial caverns are gaining increasing attention among researchers and designers due to their advantages, such as large storage capacity, flexible site selection, and minimal impact on the surrounding environment.

[0003] Underground caverns in the transportation and water conservancy industries often use monolithic reinforced concrete as their lining structure, giving full play to the role of the surrounding rock to bear external loads. However, for compressed air energy storage caverns, they not only need to withstand the external surrounding rock pressure and water pressure during the construction and operation periods, but also need to consider the high-pressure gas load acting on the interior of the cavern due to cyclic filling and discharging during the operation phase. Therefore, the force mechanism is different from that of conventional underground caverns. When steel plates are used as support structures for bearing, thicker steel plates are often required to meet the bearing capacity requirements, which is not acceptable for investment economics. If monolithic reinforced concrete lining is used for bearing, due to the weak tensile properties of concrete, although steel bars can improve the tensile strength of concrete to a certain extent, tensile failure will inevitably occur under the action of high internal pressure, resulting in a reduction in the bearing capacity of the concrete or even failure, resulting in unnecessary waste.

[0004] In summary, under such high gas storage pressure, the above lining structure has the following problems:

[0005] 1. The full ring steel plate lining is high in cost and poor in economy;

[0006] 2. Under the action of internal high-pressure gas, the integral concrete lining has poor tensile and deformation resistance and is prone to cracks, resulting in reduced bearing capacity or even failure. Summary of the Invention

[0007] The purpose of the present invention is to provide a block support structure and construction method for a compressed air energy storage underground cavern, which is suitable for the structural design of compressed air energy storage underground caverns and can also be widely used in the structural design of high-pressure underground caverns.

[0008] In order to achieve these objects and other advantages according to the present invention, a sealing structure is provided for connecting two adjacent linings on a segmented lining, comprising:

[0009] The first connector has a first connecting groove and a second connecting groove at both ends.

[0010] a second connector, one end of which extends into the second connecting groove and is slidably connected thereto, and the other end of which is provided with a third connecting groove;

[0011] an elastic pre-tightening mechanism, which is disposed in the second connecting groove and is connected to the first connector and the second connector respectively;

[0012] The ends of two adjacent linings extend into the first connecting groove and the third connecting groove respectively and are fixedly connected thereto.

[0013] Furthermore, the sealing structure further comprises:

[0014] The guide mechanism is arranged between the first joint and the second joint.

[0015] Furthermore, in the sealing structure, the guide mechanism includes:

[0016] Two sleeves are pre-buried at the ends of two adjacent linings, and the first joint and the second joint are both provided with through holes corresponding to the sleeves;

[0017] The two ends of the connecting rod respectively pass through the two through holes and are slidably extended into the two sleeves.

[0018] Furthermore, in the sealing structure, the elastic pre-tightening mechanism is a high-pressure spring, which is sleeved on the connecting rod, and its two ends respectively contact the bottom wall of the second connecting groove and one end of the second joint.

[0019] Furthermore, in the sealing structure, one end of the second joint is provided with a protrusion corresponding to the second connecting groove, and the protrusion can be slidably extended into the second connecting groove.

[0020] Furthermore, the sealing structure further comprises:

[0021] A sealing plate is arranged on the inner side of the lining, with both ends of the sealing plate respectively connected to the inner side of the first joint and the inner side of the second joint, and a protrusion is provided between the two ends. A groove is provided on the inner side of the second joint, and the protrusion is located in the groove. The part of the sealing plate located between the first joint and the protrusion is slidably fitted with the inner side of the second joint.

[0022] Furthermore, in the sealing structure, the groove is an arc-shaped groove, and the protrusion is an arc-shaped protrusion.

[0023] The present invention also provides a block support structure for a compressed air energy storage underground cavern, comprising a full-ring anchor, a sprayed concrete layer and a block lining. A waterproof layer is provided between the sprayed concrete layer and the block lining, and the two adjacent linings on the block lining are connected by a sealing structure described in any one of the above items.

[0024] The present invention also provides a construction method of a block-type support structure for a compressed air energy storage underground cavern, comprising the following steps:

[0025] S1. Excavate the surrounding rock to form a circular excavation chamber, then install full-circle anchor bolts and apply shotcrete.

[0026] S2. Apply waterproof layer on the shotcrete and level it;

[0027] S3. Connect a first joint and a second joint at both ends of the lining: one end of the lining extends into the first connecting groove of the first joint and is fixedly connected thereto, and the other end of the lining extends into the third connecting groove of the second joint and is fixedly connected thereto;

[0028] S4. Two adjacent linings are connected through the first joint and the second joint: the elastic pre-tightening mechanism is placed in the second connecting groove of the first joint, one end of the second joint extends into the second connecting groove and is slidably connected thereto, and the two ends of the elastic pre-tightening mechanism are respectively connected to the first joint and the second joint.

[0029] Furthermore, the construction method of the block-type support structure of the compressed air energy storage underground cavern further includes:

[0030] S5. Install a sealing plate at the connection between the first joint and the second joint, with both ends of the sealing plate connected to the inner side of the first joint and the inner side of the second joint respectively.

[0031] The beneficial effects of the present invention are:

[0032] This invention provides a segmented support structure and construction method for underground artificial caverns used for compressed gas energy storage. By dividing the entire ring lining into segments, prefabricated "H+U" steel structures are used as joints between the segments. Furthermore, "Ω"-shaped gaskets are used at the ports as sealing structures. This solves the problems of poor deformation capacity and high construction costs associated with existing support structures. This invention significantly improves the durability and surrounding rock utilization efficiency of underground high-pressure caverns for compressed gas energy storage, reduces project costs, and provides a more reliable and efficient solution for related engineering applications.

[0033] Other advantages, objectives and features of the present invention will be reflected in part from the following description and will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic structural diagram of the present invention;

[0035] Figure 2 This is a schematic structural diagram of the block-type support structure described in the present invention.

[0036] Wherein, the reference numerals represent:

[0037] 1-surrounding rock; 2-full ring anchor; 3-sprayed concrete; 4-waterproof layer; 5-block lining; 6-sleeve; 7-connecting rod; 8-first joint; 9-second joint; 10-sealing plate; 11-high-strength spring. DETAILED DESCRIPTION

[0038] The present invention is further described in detail below with reference to the embodiments so that those skilled in the art can implement the invention with reference to the description.

[0039] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the terms "horizontal", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0040] like Figure 1 As shown, an embodiment of the present invention provides a sealing structure for connecting two adjacent linings on a segmented lining, comprising:

[0041] The first joint has a first connecting groove and a second connecting groove at both ends thereof, and the first joint adopts an "H"-shaped steel joint, and the first connecting groove and the second connecting groove are formed at both ends of the "H"-shaped steel joint;

[0042] A second joint, one end of which extends into the second connecting groove and is slidably connected thereto, and the other end of which is provided with a third connecting groove; the second joint is a "U"-shaped channel steel joint, the opening of which forms the third connecting groove;

[0043] an elastic pre-tightening mechanism, which is disposed in the second connecting groove and is connected to the first connector and the second connector respectively;

[0044] The ends of two adjacent linings extend into the first connecting groove and the third connecting groove respectively and are fixedly connected thereto.

[0045] In this embodiment, mounting portions matching the first and third connecting grooves are machined at both ends of the lining. One end of the lining is inserted into the first connecting groove and fixedly connected to the first joint, while the other end is inserted into the third connecting groove and fixedly connected to the second joint. When connecting two adjacent linings, an elastic preload mechanism is placed in the second connecting groove, and one end of the second joint is inserted into the second connecting groove and slidably connected thereto. The two ends of the elastic preload mechanism are respectively connected to the first and second joints, forming an "H+U" prefabricated steel structure between the first and second joints. The block lining is a prefabricated reinforced concrete lining. The size and number of blocks of the block lining can be determined according to the size of the cavern, surrounding rock conditions, etc. The contact end faces of the adjacent two linings are respectively fixed with an "H"-shaped steel joint and a "U"-shaped channel steel joint, allowing the "H"-shaped steel joint and the "U"-shaped channel steel joint to slide relative to each other under the action of internal air pressure.

[0046] During the operational phase, an adaptive structure combining segmented linings and deformable joints is implemented to prevent overall lining failure. The specific operating principle is as follows: During operation, as the cavern is inflated, internal pressure gradually increases. When the internal pressure exceeds the resistance of the surrounding rock, the cavern tends to expand outward, causing the lining to deform toward the surrounding rock. At this point, the elastic preload mechanism between the segmented linings is stretched by the tensile forces of the segmented linings on either side. The H-shaped steel joints and U-shaped channel steel joints slide toward each other, allowing each lining segment to deform to a certain extent under the internal pressure without transmitting shear and tension forces to each other. When the cavern is deflated, the internal pressure gradually decreases, causing the cavern to contract inward, causing the lining to deform toward the open space. At this point, the elastic preload mechanism within the embedded sleeve of the segmented lining is compressed by the compressive forces of the segmented linings on either side. The H-shaped steel joints and U-shaped channel steel joints slide toward each other, restoring the individual lining segments to a tight fit.

[0047] Preferably, as another embodiment of the present invention, it further includes:

[0048] A guide mechanism is provided between the first and second joints. The guide mechanism comprises: two sleeves, respectively embedded in the ends of two adjacent linings; the first and second joints are each provided with a through hole corresponding to the sleeves; and a connecting rod, the ends of which pass through the two through holes and are slidably inserted into the two sleeves.

[0049] In this embodiment, the sleeve is pre-buried at the end of the lining, and the two ends of the connecting rod can slide into the two sleeves. When the first joint and the second joint slide relative to each other, the sliding of the two is limited, playing a guiding role.

[0050] Preferably, as another embodiment of the present invention, the elastic pre-tightening mechanism is a high-pressure spring, which is sleeved on the connecting rod, and its two ends respectively contact the bottom wall of the second connecting groove and one end of the second joint.

[0051] In this embodiment, when the chamber is inflated or deflated, the first joint and the second joint slide relative to each other, and the elastic deformation of the high-pressure spring is always within the elastic range. No plastic deformation or cracking due to the internal pressure occurs, which is conducive to the role of transmitting the internal air pressure.

[0052] Preferably, as another embodiment of the present invention, a protrusion corresponding to the second connecting groove is provided at one end of the second connector, and the protrusion can be slidably extended into the second connecting groove.

[0053] Preferably, as another embodiment of the present invention, it further includes:

[0054] A sealing plate is provided inside the lining. Its ends are connected to the inside of the first joint and the inside of the second joint, respectively. A raised portion is provided between its ends. A groove is provided inside the second joint, and the raised portion is located within the groove. The portion of the sealing plate located between the first joint and the raised portion slides and fits against the inside of the second joint. The groove is an arc-shaped groove, and the raised portion is an arc-shaped protrusion.

[0055] In this embodiment, the sealing plate adopts an "Ω"-shaped rigid sealing gasket, and an "Ω"-shaped rigid sealing gasket is provided at the connecting end of the "H"-shaped steel joint and the "U"-shaped channel steel joint. The "Ω"-shaped rigid sealing gasket and the "H"-shaped steel joint are fixed by welding. There are two contact surfaces between the "Ω"-shaped rigid sealing gasket and the "U"-shaped channel steel joint, one side away from the "H"-shaped steel joint is fixed by welding, and the other side can slide relatively. The above structural form can allow the "H"-shaped steel joint and the "U"-shaped channel steel joint to slide relative to each other under the action of internal air pressure. By providing an "Ω"-shaped rigid sealing gasket at the connecting end of the "H"-shaped steel joint and the "U"-shaped channel steel joint, a sealing effect can be achieved. The specific working principle is as follows: During inflation during the operational phase, the high-strength spring stretches, causing the segmented lining to deform toward the surrounding rock, causing the "H"-shaped steel joints and "U"-shaped channel steel joints to slide toward each other, and the "Ω"-shaped rigid sealing gasket expands to accommodate deformation under the action of internal air pressure. During deflation during the operational phase, the high-strength spring compresses, causing the segmented lining to deform toward the airside, causing the "H"-shaped steel joints and "U"-shaped channel steel joints to slide toward each other, and the "Ω"-shaped rigid sealing gasket subsequently returns to its original shape. During the above process, the "Ω"-shaped rigid sealing gasket always adheres tightly to the "H"-shaped steel joints and "U"-shaped channel steel joints, ensuring the structure remains airtight.

[0056] like Figure 2As shown, the present invention also provides a block support structure for a compressed air energy storage underground cavern, comprising a full-ring anchor rod, a sprayed concrete layer and a block lining, wherein a waterproof layer is provided between the sprayed concrete layer and the block lining, and the two adjacent linings on the block lining are connected by a sealing structure described in any one of the above items.

[0057] In this embodiment, the full ring of anchor bolts forms a bearing arch for the surrounding rock, stabilizing the surrounding rock during cavern excavation, while shotcrete levelizes the surrounding rock's free surface. Furthermore, both can transfer loads during the gas storage and release phases and serve as the primary load-bearing mechanism during maintenance. The specific implementation methods for constructing the above-mentioned block-type support structure are as follows:

[0058] S1, excavate the surrounding rock to form a circular excavation chamber, then install full-ring anchor bolts and apply shotcrete 3.

[0059] S2, apply waterproof layer on the shotcrete and level it.

[0060] S3: Insert the connecting steel bars into the embedded sleeves in the segmented lining, install the segmented linings in sequence, and connect adjacent segmented linings with "H" steel joints and "U" channel steel joints. S3 specifically includes:

[0061] S31, the segmented lining is prefabricated in the factory and is designed to be divided into eight equal parts;

[0062] S32, the embedded sleeve is made of high-strength nylon modified material and is cast as a whole together with the block lining;

[0063] S33, inserting the connecting steel bars into the embedded sleeves in the segmented lining;

[0064] S34, putting the high-strength spring on the connecting steel bar;

[0065] S35, "H"-shaped steel joints and "U"-shaped channel steel joints are both prefabricated structural organizations, which are fixed on the block lining after welding, and then spliced ​​to form the joint part of the block support structure. The two can slide between each other, so the joint can expand and contract freely.

[0066] S4, install "Ω" type sealing gasket between "H" type steel joint and "U" type channel steel joint.

[0067] S4 specifically includes:

[0068] S41, install the "Ω"-shaped sealing gasket at the joint of the "H"-shaped steel joint and the "U"-shaped channel steel joint, with one end fixed on the "H"-shaped steel joint and the other end fixed on the "U"-shaped steel joint.

[0069] The present invention also provides a construction method of a block-type support structure for a compressed air energy storage underground cavern, comprising the following steps:

[0070] S1. Excavate the surrounding rock to form a circular excavation chamber, then install full-circle anchor bolts and apply shotcrete.

[0071] S2. Apply waterproof layer on the shotcrete and level it;

[0072] S3. Connect a first joint and a second joint at both ends of the lining: one end of the lining extends into the first connecting groove of the first joint and is fixedly connected thereto, and the other end of the lining extends into the third connecting groove of the second joint and is fixedly connected thereto;

[0073] S4. Two adjacent linings are connected through the first joint and the second joint: the elastic pre-tightening mechanism is placed in the second connecting groove of the first joint, one end of the second joint extends into the second connecting groove and is slidably connected thereto, and the two ends of the elastic pre-tightening mechanism are respectively connected to the first joint and the second joint.

[0074] S5. Install a sealing plate at the connection between the first joint and the second joint, with both ends of the sealing plate connected to the inner side of the first joint and the inner side of the second joint respectively.

[0075] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and embodiments shown and described herein.

Claims

1. A sealing structure for a compressed air energy storage underground cavern, used to connect two adjacent linings on a block lining, characterized in that: include: The first joint is an H-shaped steel joint, and a first connecting groove and a second connecting groove are respectively provided at both ends thereof; The second joint is a U-shaped channel steel joint, one end of which extends into the second connecting groove and is slidably connected thereto, and the other end of which is provided with a third connecting groove; an elastic pre-tightening mechanism, which is disposed in the second connecting groove and is connected to the first connector and the second connector respectively; The ends of two adjacent linings extend into the first connecting groove and the third connecting groove respectively and are fixedly connected thereto; Wherein, one end of the second joint is provided with a first protrusion corresponding to the second connecting groove, and the first protrusion can be slidably extended into the second connecting groove; A sealing plate is arranged on the inner side of the lining. The sealing plate is an "Ω"-shaped rigid sealing gasket. The two ends of the sealing plate are respectively connected to the inner side of the first joint and the inner side of the second joint, and a second protrusion is provided between the two ends. A groove is provided on the inner side of the second joint, and the second protrusion is located in the groove. The part of the sealing plate located between the first joint and the second protrusion slides and fits with the inner side of the second joint.

2. A sealing structure for a compressed air energy storage underground cavern according to claim 1, characterized in that: Also includes: The guide mechanism is arranged between the first joint and the second joint.

3. A sealing structure for a compressed air energy storage underground cavern according to claim 2, characterized in that: The guiding mechanism comprises: Two sleeves are pre-buried at the ends of two adjacent linings, and the first joint and the second joint are both provided with through holes corresponding to the sleeves; The two ends of the connecting rod respectively pass through the two through holes and are slidably extended into the two sleeves.

4. A sealing structure for a compressed air energy storage underground cavern according to claim 3, characterized in that: The elastic pre-tightening mechanism is a high-pressure spring, which is sleeved on the connecting rod, and its two ends respectively contact the bottom wall of the second connecting groove and one end of the second joint.

5. The sealing structure for a compressed air energy storage underground cavern according to claim 1, characterized in that: The groove is an arc-shaped groove, and the second protrusion is an arc-shaped protrusion.

6. A block support structure for a compressed air energy storage underground cavern, comprising a full ring anchor, a sprayed concrete layer and a block lining, wherein a waterproof layer is provided between the sprayed concrete layer and the block lining, characterized in that: The two adjacent linings of the block lining are connected by the sealing structure according to any one of claims 1 to 5.

7. A construction method for a block-type support structure for a compressed air energy storage underground cavern according to claim 6, characterized in that: The following steps are involved: S1. Excavate the surrounding rock to form a circular excavation chamber, then drive in full-ring anchor bolts and apply a shotcrete layer; S2. Apply waterproof layer on the shotcrete layer and level it; S3. Connect a first joint and a second joint at both ends of the lining: one end of the lining extends into the first connecting groove of the first joint and is fixedly connected thereto, and the other end of the lining extends into the third connecting groove of the second joint and is fixedly connected thereto; S4. Connecting two adjacent linings via the first joint and the second joint: placing an elastic pre-tightening mechanism in the second connecting groove of the first joint, extending one end of the second joint into the second connecting groove and slidingly connected thereto, and connecting both ends of the elastic pre-tightening mechanism to the first joint and the second joint, respectively; S5. Install a sealing plate at the connection between the first joint and the second joint, with both ends of the sealing plate connected to the inner side of the first joint and the inner side of the second joint respectively.

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