Block type supporting structure of compressed air energy storage underground cavern and construction method

Abstract

The invention relates to the field of underground cavern supporting structures. The invention relates to an underground cavern, in particular to a partitioned supporting structure of a compressed air energy storage underground cavern and a construction method. The invention provides a partitioned supporting structure of a compressed air energy storage underground cavern and a construction method, which are suitable for the structural design of the compressed air energy storage underground cavern and can also be widely applied to the structural design of a high-pressure underground cavern.

Description

Technical Field

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

[0002] As compressed air energy storage technology continues to mature, the design of gas storage has become the key to the construction of compressed air energy storage power stations. Ground gas storage often uses metal pressure vessels or other material gas storage bins as gas storage devices, but pressure vessels are expensive, occupy a large area, and have limited storage capacity. Underground artificial caverns have the advantages of large storage scale, flexible site selection, and little impact on the surrounding environment, and are increasingly attracting the attention of researchers and designers.

[0003] In the underground caverns of the transportation and water conservancy industries, monolithic reinforced concrete is often used as the lining structure to give full play to the role of the surrounding rock to bear the external load. For compressed gas energy storage caverns, it is not only necessary to withstand the external surrounding rock pressure and water pressure during the construction and operation periods, but also necessary to consider the high-pressure gas load inside the cavern due to the cyclic filling and degassing during the operation stage. 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 allowed for the economic efficiency of the investment. If monolithic reinforced concrete lining is used for bearing, due to the weak tensile properties of concrete, although the steel bars can improve the tensile capacity of concrete to a certain extent, under the action of high internal pressure, tensile damage will inevitably occur, 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 purposes 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 joint has a first connecting groove and a second connecting groove at both ends thereof,

[0010] A second joint, one end of which extends into the second connection groove and is slidably connected thereto, and the other end of which is provided with a third connection 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 comprises:

[0016] Two sleeves are respectively embedded in 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, a protrusion corresponding to the second connecting groove is provided at one end of the second joint, 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, wherein 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 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, and the portion 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 shotcrete layer and a block lining, a waterproof layer is provided between the shotcrete layer and the block lining, and 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 of a compressed air energy storage underground cavern, comprising the following steps:

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

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

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

[0028] S4. Two adjacent linings are connected via 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 both 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 support structure of the compressed air energy storage underground cavern also includes:

[0030] S5. Install a sealing plate at the connection between the first joint and the second joint, wherein 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.

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

[0032] The present invention provides a block-type support structure and construction method for an underground artificial cavern suitable for compressed gas energy storage, divides the whole ring lining into blocks, and uses "H+U" prefabricated steel structure as a joint component between the blocks, and uses "Ω" type sealing gaskets as sealing structures at the ports, solving the problems of poor deformation capacity and high cost of the support structure in the prior art. The present invention significantly improves the durability and surrounding rock utilization efficiency of the underground high-pressure cavern for compressed gas energy storage, reduces the project cost, and provides a more reliable and efficient solution for related engineering applications.

[0033] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part 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 It is a structural schematic diagram of the present invention;

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

[0036] Wherein, the reference numerals represent:

[0037] 1-surrounding rock; 2-full ring anchor rod; 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 in conjunction with 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 "lateral", "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 on 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 block-type lining, comprising:

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

[0042] A second joint, one end of which extends into the second connection groove and is slidably connected thereto, and the other end of which is provided with a third connection groove; the second joint adopts a "U"-shaped channel steel joint, and its opening forms the third connection 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 parts matching the first connection groove and the third connection groove are processed at both ends of the lining, one end of the lining is inserted into the first connection groove and fixedly connected to the first joint, and the other end is inserted into the third connection groove and fixedly connected to the second joint. When connecting two adjacent linings, the elastic preload mechanism is placed in the second connection groove, and then one end of the second joint is inserted into the second connection groove and slidably connected thereto. The two ends of the elastic preload mechanism are respectively connected to the first joint and the second joint, and the first joint and the second joint form an "H+U" prefabricated steel structure. The block lining is a prefabricated reinforced concrete lining, and 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 two adjacent linings are respectively fixed with an "H" steel joint and a "U" channel steel joint, so that the "H" steel joint and the "U" channel steel joint can slide relative to each other under the action of internal air pressure.

[0046] During the operation stage, the adaptive structure of block lining + deformable joint is set to avoid the overall damage of the lining. The specific working principle is as follows: When the cavern is inflated during the operation stage, the internal pressure of the cavern gradually increases. When the internal air pressure is greater than the resistance of the surrounding rock, the cavern will tend to expand outward, and the lining will deform toward the surrounding rock. At this time, the elastic preload mechanism set between the block linings will be stretched by the tension of the block linings on both sides, and the "H" steel joint and the "U" channel steel joint will slide towards each other, so that each lining can be deformed to a certain extent under the action of the internal air pressure without transmitting shear force and tension to each other. When the cavern is deflated, the internal pressure gradually decreases, the cavern tends to shrink inward, and the lining deforms toward the air side. At this time, the elastic preload mechanism set in the embedded sleeve of the block lining is compressed by the extrusion force of the block linings on both sides, and the "H" steel joint and the "U" channel steel joint slide towards each other, so that each lining is close again.

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

[0048] The guide mechanism is arranged between the first joint and the second joint. The guide mechanism comprises: two sleeves, which are respectively embedded in the ends of two adjacent linings, and the first joint and the second joint are both provided with through holes corresponding to the sleeves; and a connecting rod, both ends of which pass through the two through holes respectively and are respectively slidable 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 be slidably extended into the two sleeves. When the first joint and the second joint slide relative to each other, the sliding of the two is limited to play 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 transmission of 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 joint, and the protrusion can be slidably extended into the second connecting groove.

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

[0054] The sealing plate is arranged inside the lining, and 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 convex part is arranged between the two ends, and a groove is arranged inside the second joint, and the convex part is arranged inside the groove, and the part of the sealing plate located between the first joint and the convex part is slidably fitted with the inner side of the second joint. The groove is an arc-shaped groove, and the convex part is an arc-shaped convexity.

[0055] In this embodiment, the sealing plate adopts an "Ω"-shaped rigid sealing gasket, and an "Ω"-shaped rigid sealing gasket is arranged 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 arranging 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 the operation stage, when inflated, the high-strength spring stretches, the block lining deforms toward the surrounding rock side, the "H" steel joint and the "U" channel steel joint slide toward each other, and the "Ω" rigid sealing gasket opens to adapt to the deformation under the action of internal air pressure; during the operation stage, when deflated, the high-strength spring compresses, the block lining deforms toward the air side, the "H" steel joint and the "U" channel steel joint slide toward each other, and the "Ω" rigid sealing gasket returns to its original state. During the above process, the "Ω" rigid sealing gasket is always in close contact with the "H" steel joint and the "U" channel steel joint, and the structure can maintain air tightness.

[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, a shotcrete layer and a block lining, a waterproof layer is provided between the shotcrete layer and the block lining, and 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 anchor rod forms an anchor rod surrounding rock bearing arch to stabilize the surrounding rock during cave excavation, and the shotcrete can level the surrounding rock surface. In addition, the two can transfer loads during the gas storage and release stage and serve as the main body of load bearing during maintenance. When constructing the above-mentioned block support structure, the specific implementation method is as follows:

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

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

[0060] S3, insert the connecting steel bar into the embedded sleeve in the block lining, install the block lining in sequence, and connect the adjacent block linings with "H" steel joints and "U" channel steel joints. S3 specifically includes:

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

[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 bar into the embedded sleeve 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 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 them, 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" type sealing gasket at the joint port of the "H" type steel joint and the "U" type channel steel joint, with one end fixed on the "H" type steel joint and the other end fixed on the "U" type steel joint.

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

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

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

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

[0073] S4. Two adjacent linings are connected via 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 both 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, wherein 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.

[0075] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes. 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 the embodiments shown and described herein.

Claims

1. A sealing structure for connecting two adjacent linings on a block lining, characterized in that: include: The first joint has a first connecting groove and a second connecting groove at both ends thereof, A second joint, one end of which extends into the second connection groove and is slidably connected thereto, and the other end of which is provided with a third connection 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.

2. A sealing structure 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 according to claim 2, characterized in that: The guiding mechanism comprises: Two sleeves are respectively embedded in 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 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 the two ends of the elastic pre-tightening mechanism are respectively in contact with the bottom wall of the second connecting groove and one end of the second joint.

5. A sealing structure according to claim 1, characterized in that: A protrusion corresponding to the second connecting groove is provided at one end of the second joint, and the protrusion can be slidably extended into the second connecting groove.

6. A sealing structure according to claim 5, characterized in that: Also includes: A sealing plate is arranged on the inner side of the lining, wherein 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 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, and the portion of the sealing plate located between the first joint and the protrusion is slidably fitted with the inner side of the second joint.

7. A sealing structure according to claim 6, characterized in that: The groove is an arc-shaped groove, and the protrusion is an arc-shaped protrusion.

8. A block support structure for a compressed air energy storage underground cavern, comprising a full ring anchor, a shotcrete layer and a block lining, wherein a waterproof layer is provided between the shotcrete layer and the block lining, characterized in that: The two adjacent linings of the block lining are connected by the sealing structure described in any one of claims 1-7.

9. A construction method of a block support structure for a compressed air energy storage underground cavern, 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 shotcrete; S2. Apply waterproof layer on the shotcrete and level it; S3, connecting the first joint and the second joint at both ends of the lining respectively: one end of the lining extends into the first connection groove of the first joint and is fixedly connected thereto, and the other end of the lining extends into the third connection groove of the second joint and is fixedly connected thereto; S4. Two adjacent linings are connected via 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 both ends of the elastic pre-tightening mechanism are respectively connected to the first joint and the second joint.

10. The construction method of a block-type support structure for a compressed air energy storage underground cavern according to claim 9, characterized in that: Also includes: S5. Install a sealing plate at the connection between the first joint and the second joint, wherein 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.

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