Deformation coordination device suitable for compressed air energy storage soft rock gas storage chamber

Abstract

The utility model relates to a deformation coordination device suitable for a compressed air energy storage soft rock gas storage chamber, which relates to the technical field of compressed air energy storage in a novel energy storage mode and comprises an embedded connecting piece, a spring and a steel casing. The pre-embedded connecting pieces have preset bending radian and supporting force, and the number of the pre-embedded connecting pieces is multiple; the two ends of the spring are connected with the embedded connecting pieces, and the spring has the preset operation length and deformation force and is used for communicating the multiple embedded connecting pieces. The steel casing has a preset operation size, is hollow and is of a multi-petal structure, two ends of the steel casing are open, and the steel casing is sleeved outside the spring and can carry out corresponding protection and supporting operation. The deformation relation between the sealing and lining structure and the surrounding rock can be coordinated, the surrounding rock stress is fully utilized, the lining crack width is effectively reduced, the air tightness of the flexible sealing layer is guaranteed, the operation safety of the gas storage is improved, and meanwhile construction feasibility and economical efficiency are achieved. Therefore, the purpose of using the soft surrounding rock gypsum ore as the compressed air energy storage and gas storage can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of compressed air energy storage for new energy storage methods, and particularly relates to a deformation coordination device applicable to a soft rock gas storage chamber for compressed air energy storage. Background Technique

[0002] In recent years, with the successive breakthroughs in the key technologies of surface equipment, the compressed air energy storage technology has developed rapidly. However, the construction and transformation technology of underground gas storage chambers is the main factor restricting the development of this technology. There are many relevant studies on the construction and transformation of salt caverns and hard rock gas storage chambers with good congenital conditions, and demonstration projects that have been put into production and application already exist. Due to the limitation of the regional distribution of salt caverns and hard rock chambers, there are no conditions for building gas storage facilities in many areas. Therefore, in areas with abundant soft surrounding rock gypsum mine goaf chambers, how to make full use of the soft surrounding rock gypsum mine gas storage chambers has good application prospects. There are few studies on soft surrounding rock gypsum mine gas storage chambers. Under the action of high internal pressure cyclic load of compressed air, soft surrounding rock gypsum mines have technical problems such as large deformation and easy damage compared with hard rock chambers. At the same time, the stiffness of the reinforced concrete structure is large and the deformation is small. If the form of thickening the reinforced concrete lining structure is adopted, the cost is relatively high. Therefore, under the condition of making full use of the stress of soft surrounding rock, to complete the chamber structure in soft surrounding rock, the main problem to be solved is the coordinated deformation problem between the reinforced concrete lining structure and the soft surrounding rock. Content of the Utility Model

[0003] Purpose of the utility model: To provide a deformation coordination device applicable to a soft rock gas storage chamber for compressed air energy storage to solve the above problems existing in the prior art.

[0004] Technical solution: A deformation coordination device applicable to a soft rock gas storage chamber for compressed air energy storage includes three components: embedded connectors, springs, and steel cylinders. The embedded connectors have a predetermined bending arc and supporting force, and there are multiple of them, which can perform corresponding connection and limiting operations; both ends of the spring are connected to the embedded connectors, and have a predetermined working length and deformation force, and can perform stretching operations within a predetermined range for the mutual connection between multiple embedded connectors; the steel cylinder has a predetermined working size, is hollow and has a multi-petal structure, is open at both ends, and is sleeved outside the spring to perform corresponding protection and support operations.

[0005] In a further embodiment, the steel cylinder includes a left steel cylinder segment and a right steel cylinder segment; both the left steel cylinder segment and the right steel cylinder segment have a predetermined bending arc, and are provided with corresponding clamping grooves and positioning convex handles; and the working position of the clamping groove provided on the left steel cylinder segment corresponds to the working position of the positioning convex handle provided on the right steel cylinder, and the working position of the clamping groove provided on the right steel cylinder segment corresponds to the working position of the positioning convex handle provided on the left steel cylinder.

[0006] In a further embodiment, the spring is a tension spring having a predetermined working length and deformation force; a plurality of the embedded connectors are symmetrically distributed and are all connected to the spring.

[0007] In a further embodiment, the embedded connector is in a concave shape and is provided with a corresponding extended clamping end having a predetermined supporting force for performing corresponding connection and limiting operations.

[0008] In a further embodiment, the left steel casing segment and the right steel casing segment are provided with arc-shaped grooves, and the working dimensions of the provided arc-shaped grooves are adapted to form an open bearing cavity having a predetermined working dimension, and the spring is wrapped in the bearing cavity formed by the left steel casing segment and the right steel casing segment.

[0009] Beneficial effects: The present utility model relates to a deformation coordination device applicable to a compressed air energy storage soft rock gas storage chamber, belonging to the technical field of compressed air energy storage technology of a new energy storage method, and comprising three components: an embedded connector, a spring, and a steel casing. The embedded connector has a predetermined bending curvature and supporting force, and is multiple in number for performing corresponding connection and limiting operations; both ends of the spring are connected to the embedded connector, having a predetermined working length and deformation force for performing stretching operations within a predetermined range for interconnecting a plurality of the embedded connectors; the steel casing has a predetermined working dimension, is hollow and has a multi-petal structure with both ends open, and is sleeved outside the spring for performing corresponding protection and support operations. This application can coordinate the deformation relationship between the sealing, lining structure and surrounding rock, make full use of the surrounding rock stress, effectively reduce the width of the lining crack to ensure the airtightness of the flexible sealing layer, improve the operation safety of the gas storage, and at the same time have construction feasibility and economy. Furthermore, the purpose of using soft surrounding rock gypsum ore as a compressed air energy storage gas storage can be achieved. Description of the Drawings

[0010] Figure 1 It is a schematic structural diagram of a compressed air energy storage gas storage in soft surrounding rock gypsum ore.

[0011] Figure 2 It is a schematic structural diagram of a deformation coordination device applicable to a compressed air energy storage soft rock gas storage chamber.

[0012] Figure 3 It is a schematic structural diagram of an outer steel casing of a pre-tensioned spring.

[0013] Each reference numeral in the figure is: deformation coordination device 1, high-strength spring 1-1, steel casing 1-2, left steel casing segment 1-2-1, right steel casing segment 1-2-2, embedded connector 1-3, ductile filling concrete 1-4, reinforced concrete lining sheet 2, sliding layer 3, shotcrete leveling layer 4, gypsum ore soft surrounding rock 5, sealing layer 6. Detailed implementation mode

[0014] In the following description, a large number of specific details are given to provide a more thorough understanding of the present utility model. However, it is obvious to those skilled in the art that the present utility model can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present utility model, some technical features well known in the art are not described.

[0015] The deformation coordination device 1 applicable to the soft rock gas storage chamber for compressed air energy storage proposed in this embodiment includes three components: an embedded connecting piece 1-3, a spring, and a steel casing 1-2. The embedded connecting piece 1-3 has a predetermined bending arc and supporting force, and there are multiple of them, which can perform corresponding connection and limiting operations; both ends of the spring are connected to the embedded connecting piece 1-3, having a predetermined working length and deformation force, and can perform stretching operations within a predetermined range, for connecting multiple embedded connecting pieces 1-3 to each other; the steel casing 1-2 has a predetermined working size, is hollow and of a multi-piece structure, with both ends open, and is sleeved outside the spring, and can perform corresponding protection and support operations. The steel casing 1-2 includes a left steel casing segment 1-2-1 and a right steel casing segment 1-2-2; both the left steel casing segment 1-2-1 and the right steel casing segment 1-2-2 have a predetermined bending arc, and are provided with corresponding clamping grooves and positioning convex handles; and the working position of the clamping groove provided on the left steel casing segment 1-2-1 corresponds to the working position of the positioning convex handle provided on the right steel casing 1-2, and the working position of the clamping groove provided on the right steel casing segment 1-2-2 corresponds to the working position of the positioning convex handle provided on the left steel casing 1-2. The spring is a tension spring, having a predetermined working length and deformation force; multiple embedded connecting pieces 1-3 are symmetrically distributed and are all connected to the spring. The embedded connecting piece 1-3 is in a concave shape and is provided with a corresponding extended clamping end, having a predetermined supporting force, and can perform corresponding connection and limiting operations. The left steel casing segment 1-2-1 and the right steel casing segment 1-2-2 are provided with arc-shaped grooves, and the working sizes of the arc-shaped grooves provided are adapted to each other, and can form an open bearing cavity with a predetermined working size, and the spring is wrapped in the bearing cavity formed by the left steel casing segment 1-2-1 and the right steel casing segment 1-2-2.

[0016] On the basis of the above embodiment, the present application is further described in conjunction with the accompanying drawings:

[0017] The soft surrounding rock mined-out chambers formed after gypsum mining are reconstructed into compressed air energy storage reservoirs. Under the compressed air charging and discharging cycle of 1-15MPa, the soft surrounding rock mined-out chambers or mined-out tunnels must be structurally reinforced. At present, the structure of the compressed air energy storage reservoir first expands or fills the abandoned gypsum mine chambers in a circular shape, then levels them with shotcrete, hangs the mesh to install the asphalt sliding layer 3, installs the lining layer, and finally applies the sealing layer 6 inside the lining layer. Among them, the surrounding rock and lining layer bear the load of the high internal pressure gas, while the sealing layer 6 does not bear it, and the elastic strain of the sealing layer 6 is greater than that of the lining layer, and it deforms with the deformation of the lining layer.

[0018] Under the action of 1-15MPa high internal pressure cyclic load, the soft surrounding rock 5 of the gypsum mine undergoes plastic failure and has a large deformation. The rigidity of the reinforced concrete lining layer is relatively large. If it is not segmented and the deformation coordination device 1 is not designed, the reinforced concrete cannot achieve coordinated deformation with the soft surrounding rock. That is, the surrounding rock resistance cannot be fully utilized. The above problem can only be solved by increasing the thickness of the reinforced concrete lining layer, resulting in a large increase in cost.

[0019] In view of the above problems, a deformation coordination device 1 for connecting reinforced concrete lining segments 2 is designed. The reinforced concrete lining segments 2 are prefabricated in a factory in a similar way to subway segments, and according to the structural design check, the internal reinforcement and embedded connectors 1-3 of the reinforced concrete lining segments 2 are designed, that is, the embedded connectors 1-3 are connected to the steel bars in the reinforced concrete lining segments 2, and have strong connectivity while bearing tensile force, effectively avoiding the occurrence of fracture phenomena. After the reinforced concrete lining segments 2 are installed at the designed construction position, springs are installed. In a further preferred embodiment, the springs are high-strength springs. Between adjacent reinforced concrete lining segments 2, the springs are pre-tensioned by a hydraulic jack according to the designed tensile length. After the reinforced concrete lining segments 2 are stretched and installed at the designed position, there is a tensile force in the springs that pulls the adjacent two segments together at this time. After the reinforced concrete lining segments 2 and the springs are both installed at the designed positions, a left steel casing segment 1-2-1 and a right steel casing segment 1-2-2 are installed outside the springs. At this time, the steel casing 1-2 forms a support between adjacent reinforced concrete lining segments 2 under the action of the pre-tension of the springs, and then the support of the hydraulic jack is removed. After lubrication treatment and film wrapping outside the steel casing 1-2, ductile filling concrete 1-4 is poured into the space between adjacent reinforced concrete lining segments 2. The deformation modulus of the ductile filling concrete 1-4 after design preparation is greater than the maximum deformation amount of the springs. After the ductile filling concrete 1-4 has finally set and played its role, the sealing layer 6 is constructed, thus completing the construction and transformation project of the compressed air energy storage gas storage chamber in the soft surrounding rock 5 of the gypsum mine. In a further preferred embodiment, the lubrication treatment outside the steel casing 1-2 can adopt any lubricant or lubricating layer with lubricating effect in the prior art. The ductile filling concrete 1-4 is high-ductility concrete or composite concrete in the prior art.

[0020] After the project is completed, high internal pressure cyclic loading is carried out inside the gas storage chamber. The pressure is transmitted to the lining layer (including the deformation coordination device 1 and the reinforced concrete lining segments 2) through the sealing layer 6. The lining layer is the main pressure-bearing layer. The pressure is transmitted to the soft surrounding rock through a part of the reinforced concrete lining segments 2, causes elastic deformation to a part of the reinforced concrete lining segments 2, and causes elastic deformation to the deformation coordination device 1. Among them, the working principle during the deformation process of the deformation coordination device 1 is that under the action of pressure, first the pre-tension force during installation offsets the pressure. After the offset, the spring is elastically stretched under the action of the pressure. The steel casing 1-2 does not have a limiting effect on it. At this time, the ductile filling concrete 1-4 and the spring undergo coordinated deformation, and the ductile filling concrete 1-4 does not have a limiting effect on the steel casing 1-2, ensuring that the lining layer does not crack, bulge, sink and other phenomena, thus realizing the protection of the sealing layer 6. When deflating, under the tensile force of the spring, a tensile force is generated on the adjacent reinforced concrete lining segments 2 of the lining layer, ensuring the structural stability of the chamber to a certain extent after pressure relief.

[0021] As shown in the Figure 1 accompanying drawings, the structure of the compressed air energy storage gas storage in soft surrounding rock gypsum ore from the inside to the outside is as follows: a sealing layer 6, a lining layer (including a reinforced concrete lining sheet 2 and a deformation coordination device 1 connecting the reinforced concrete lining sheets 2), a sliding layer 3, an anchor shotcrete leveling layer 4, and soft surrounding rock 5 of gypsum ore.

[0022] Note: The function of the

[0023] externally provided sliding layer 3 is to set the sliding layer 3 on the inner surface of the anchor shotcrete layer. The sliding thickness should not be too thick, and it is preferably 0.5 - 1 cm. The sliding layer 3 includes an asphalt layer, a felt layer, and an asphalt mastic layer arranged in sequence from the inside to the outside. An asphalt layer is smeared on the inner surface of the outer concrete lining layer, a felt layer is laid on the smeared asphalt layer, and an asphalt mastic layer is smeared outside the felt layer to form the sliding layer 3. The sliding layer 3 has a small friction coefficient, and its function is to separate the anchor shotcrete lining layer from the inner concrete lining layer and reduce the restraint of the inner concrete lining layer, which is beneficial to the free deformation of the inner concrete lining layer.

[0024] This device absorbs the stress acting on the cross-section of the lining layer through a pre-tensioned spring. When the device is installed without internal pressure, the pre-tensioned spring is protected by a detachable steel casing 1-2 and the support between the segments. The intermediate gap is filled with ductile concrete to meet the deformation requirements and protect the internal sealing layer 6. This energy absorption device absorbs the internal pressure by applying prestress to the high-strength spring 1-1, so as to reduce the thickness of the lining structure and achieve the deformation coordination of the lining layer and the surrounding rock.

[0025] As described above, although the present utility model has been shown and described with reference to specific preferred embodiments, it should not be construed as a limitation of the present utility model itself. Various changes can be made in its form and details without departing from the spirit and scope of the present utility model defined by the appended claims.

Claims

1. A deformation coordination device suitable for compressed air energy storage soft rock gas storage chamber, characterized in that include: The embedded connector has a predetermined bending arc and supporting force, and there are multiple of them, which can perform corresponding connection and limit operations; A spring, both ends of which are connected to the embedded connector, has a predetermined operating length and deformation force, can perform a stretching operation within a predetermined range, and is used for interconnection between a plurality of the embedded connectors; The steel casing has a predetermined operating size, is hollow and has a multi-petal structure, is open at both ends, and is sleeved outside the spring to perform corresponding protection and support operations.

2. A deformation coordination device suitable for compressed air energy storage soft rock gas storage chamber according to claim 1, characterized in that: The steel casing includes a left steel casing segment and a right steel casing segment; the left steel casing segment and the right steel casing segment both have a predetermined bending arc, and are provided with corresponding positioning grooves and positioning protrusions; and the operating position of the positioning groove of the left steel casing segment corresponds to the operating position of the positioning protrusion set for the right steel casing, and the operating position of the positioning groove of the right steel casing segment corresponds to the operating position of the positioning protrusion set for the left steel casing.

3. A deformation coordination device suitable for compressed air energy storage soft rock gas storage chamber according to claim 2, characterized in that: The spring is a tension spring having a predetermined operating length and deformation force; The plurality of embedded connecting parts are symmetrically distributed and are all connected to the spring.

4. A deformation coordination device suitable for compressed air energy storage soft rock gas storage chamber according to claim 2, characterized in that: The embedded connecting piece is concave-shaped and is provided with a corresponding extended locking end, has a predetermined supporting force, and can perform corresponding connection and limiting operations.

5. A deformation coordination device suitable for compressed air energy storage soft rock gas storage chamber according to claim 4, characterized in that: The left steel casing segment and the right steel casing segment are provided with arc-shaped grooves, and the operating dimensions of the arc-shaped grooves are adapted to form an open load-bearing cavity with a predetermined operating dimension, and the spring is wrapped in the load-bearing cavity formed by the left steel casing segment and the right steel casing segment.

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