A chamber reinforcing structure and a chamber reinforcing method

Abstract

The application provides a chamber reinforcing structure and a chamber reinforcing method. The chamber reinforcing structure comprises a chamber body, a first anchor rod, a second anchor rod and a reinforcing rib. The first end of the first anchor rod is inserted into the upper surrounding rock of the chamber body. The first end of the second anchor rod is inserted into the lower surrounding rock of the chamber body. The two ends of the reinforcing rib are connected with the second end of the first anchor rod and the second end of the second anchor rod respectively. According to the above technical scheme, the upper surrounding rock and the lower surrounding rock of the chamber body are connected by the anchor rods and the reinforcing rib, so that the stability of the upper surrounding rock is ensured during, for example, the compressed air energy storage process, and accidents such as fracture and roof collapse of the upper surrounding rock are effectively avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of chamber reinforcement, and more particularly to a chamber reinforcement structure and a chamber reinforcement method. BACKGROUND

[0002] In the mining process of a mine, a horizontal chamber is formed in a goaf. The horizontal chamber has a shallow burial depth and well-cemented rock, but the overlying rock has a shallow burial depth. In the pressure storage process (i.e., the air pressure in the chamber can reach several megapascals), the stability of the overlying rock cannot be guaranteed, which can cause the rock to break and fracture, and safety accidents are prone to occur, thereby bringing a series of problems to the use of the chamber.

[0003] Therefore, there is an urgent need for a new technical solution to solve the above technical problems. SUMMARY

[0004] A series of simplified concepts are introduced in the summary section, which will be further described in detail in the specific embodiment section. The summary section of the present application does not mean to attempt to limit the key features and necessary technical features of the claimed technical solution, nor to attempt to determine the protection scope of the claimed technical solution.

[0005] In a first aspect, the present application provides a chamber reinforcement structure, comprising: a chamber body, a first anchor rod, a second anchor rod, and a reinforcing rib.

[0006] The first end of the first anchor rod is inserted into the upper surrounding rock of the chamber body.

[0007] The first end of the second anchor rod is inserted into the lower surrounding rock of the chamber body.

[0008] The two ends of the reinforcing rib are connected to the second end of the first anchor rod and the second end of the second anchor rod, respectively.

[0009] Optionally, the reinforcing ribs are arranged in pairs, and each pair of reinforcing ribs is symmetrically distributed about a midplane of the width direction of the chamber body.

[0010] Optionally, the insertion angles of the first anchor rod and the second anchor rod connected to each pair of reinforcing ribs on the chamber body are equal.

[0011] Optionally, the number of reinforcing ribs is proportional to the insertion angle.

[0012] Optionally, in the case of storing compressed air inside the chamber body, the safety critical condition of the upper surrounding rock of the chamber body is: wherein σ represents the ground stress of the upper surrounding rock, τ represents the shear strength of the sidewall of the chamber body, L represents the effective area of the sidewall, F represents the bearing capacity of the reinforcing rib, and a irepresents the angle of the first anchor rod and the second anchor rod connected by the i-th pair of reinforcing bars in the chamber body, n represents the number of reinforcing bars, P represents the pressure of compressed air, and S represents the area of the upper surrounding rock.

[0013] Optionally, the reinforcing bars are uniformly distributed in the chamber body, and the distance between each pair of reinforcing bars is equal to the unit footage distance divided by the number of reinforcing bars in the unit footage distance.

[0014] Optionally, the reinforcing bars are coated with an anticorrosive material on the surface.

[0015] Optionally, the two ends of the reinforcing bars are bolted to the second end of the first anchor rod and the second end of the second anchor rod, respectively.

[0016] In a second aspect, a chamber reinforcing method is also provided for laying the chamber reinforcing structure as described above, the method comprising:

[0017] inserting the first anchor rod into the upper surrounding rock of the chamber body;

[0018] inserting the second anchor rod into the lower surrounding rock of the chamber body;

[0019] connecting the reinforcing bars between the first anchor rod and the second anchor rod.

[0020] Optionally, the method further comprises:

[0021] obtaining the maximum gas pressure that the chamber body bears when storing compressed air;

[0022] determining the number of reinforcing bars and the angle of insertion of the first anchor rod and the second anchor rod into the chamber body based on the maximum gas pressure and the internal structure of the chamber body.

[0023] According to the above technical solution, the upper surrounding rock and the lower surrounding rock of the chamber body are connected by anchor rods and reinforcing bars, thereby ensuring the stability of the upper surrounding rock during, for example, compressed air storage, and effectively avoiding accidents such as rupture of the upper surrounding rock and roof collapse.

[0024] The chamber reinforcing structure of the present application, other advantages, objects and features of the present application will be embodied in part by the following description, and part will be understood by those skilled in the art through research and practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0025] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of preferred embodiments and are not meant to limit the present application. Furthermore, the same reference numerals are used throughout the several views to denote the same or similar parts. In the drawings:

[0026] Figure 1A schematic diagram of a chamber reinforcing structure according to one embodiment of the present application is shown;

[0027] Figure 2 A schematic diagram of a chamber reinforcing structure according to another embodiment of the present application is shown;

[0028] Figure 3 A schematic diagram of the stress of the upper surrounding rock of a chamber body according to one embodiment of the present application is shown; and

[0029] Figure 4 A schematic flow chart of a chamber reinforcing method according to one embodiment of the present application is shown. DETAILED DESCRIPTION

[0030] The terms "first", "second", "third", "fourth" and the like in the description and in the claims of the present application, if any, are used for distinguishing between similar objects and not necessarily for describing a specific sequential or chronological order. It is to be understood that the use of these terms herein is to be construed to cover a non-sequential process unless expressly indicated otherwise. Further, the terms "comprising", "having", "including" and "containing" and any variations thereof in the present specification are intended to cover a non-exclusive inclusion, such that a process, method, system, product or apparatus that comprises, has, includes or contains a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, system, product or apparatus. The following description of the embodiments of the present application is provided as an enabling teaching of the application and is not intended to be limiting of the application.

[0031] As mentioned above, the horizontal chamber has a shallow depth, the rock is well cemented, and the sealing can meet the compressed air storage requirements, and can be used to store compressed air. However, the gas pressure required in the compressed air storage process is generally 7-10 MPa, at which the pressure has exceeded the ground stress (less than 7 MPa) of the overlying rock of the chamber, which can cause the rock to break and fracture, and more likely to cause the compressed air to break through the overlying rock, resulting in gas leakage and causing engineering accidents. Therefore, in order to solve the above technical problems, the present application proposes a chamber reinforcing structure, which maximizes the stability of the chamber. For the convenience of description and understanding, the depth of the horizontal chamber is taken as 300 meters, the cross-sectional size is taken as 10 meters*10 meters, and the length is taken as 100 meters for the following description.

[0032] According to a first aspect of the present application, the present application proposes a chamber reinforcing structure. Figure 1 A schematic diagram of a chamber reinforcing structure 100 according to one embodiment of the present application is shown.

[0033] AsFigure 1 As shown, the chamber reinforcement structure 100 may include a chamber body 110, a first anchor rod 120, a second anchor rod 130, and a reinforcing rib 140.

[0034] The first end of the first anchor bolt 120 is inserted into the upper surrounding rock of the chamber body 110. The first end of the second anchor bolt 130 is inserted into the lower surrounding rock of the chamber body 110.

[0035] Understandably, an anchor bolt, as a tension member extending deep into the ground, has one end connected to the engineering structure and the other end penetrating into the ground. The entire anchor bolt can be divided into a free section and an anchored section. The free section refers to the area where the tension at the anchor head is transmitted to the anchor body; its function is to apply prestress to the anchor bolt. The anchored section refers to the area where cement grout bonds the prestressing tendons to the soil layer; its function is to increase the bonding friction between the anchor body and the soil layer, increasing the bearing capacity of the anchor body and transmitting the tension from the free section to the depths of the soil. For the first anchor bolt 120, the location of its first end is the anchored section, used to bond with the upper surrounding rock layer of the chamber body 110 to increase the bearing capacity of the anchor body. Similarly, for the second anchor bolt 130, the location of its first end is the anchored section, used to bond with the lower surrounding rock layer of the chamber body 110 to increase the bearing capacity of the anchor body. After the first anchor rod 120 and the second anchor rod 130 are respectively inserted into the upper and lower surrounding rock of the chamber body, a reinforcing rib 140 is connected between the first anchor rod 120 and the second anchor rod 130. Specifically, both ends of the reinforcing rib 140 are connected to the second ends of the first anchor rod 120 and the second anchor rod 130, respectively. That is, the reinforcing rib 140 connects the free sections of the first anchor rod 120 and the second anchor rod 130, respectively. It is understood that the reinforcing rib 140 can be a support component made of any reasonable material, such as steel bars. Optionally, both ends of the reinforcing rib 140 can be bolted to the second ends of the first anchor rod 120 and the second anchor rod 130, respectively. Thus, the bolted structure can be removed, facilitating subsequent maintenance. Alternatively, both ends of the reinforcing rib 140 can also be fixedly connected to the second ends of the first anchor rod 120 and the second anchor rod 130, respectively, for example, by welding. This ensures the stability of the connection.

[0036] Specifically, a hole can be drilled in the surrounding rock above the chamber body 110, with the hole location forming a certain angle with the centerline of the chamber, for example, α degrees. See again. Figure 1 The dotted line in the diagram represents the centerline of the chamber. After drilling, the first anchor bolt 120 is installed and grouting is performed. Similarly, a hole can be drilled in the lower surrounding rock of the chamber body 110, with the hole position also at an angle α to the centerline of the chamber. After drilling, the second anchor bolt 130 is installed and grouting is performed. Optionally, multiple pairs of the first anchor bolt 120 and the second anchor bolt 130 can be installed, and a reinforcing rib 140 is connected between each pair of anchor bolts.

[0037] According to the above technical solution, the upper and lower surrounding rocks of the chamber body are connected by anchor bolts and reinforcing bars, thereby ensuring the stability of the upper surrounding rock during processes such as compressed air energy storage and effectively avoiding accidents such as upper surrounding rock fracture and top collision.

[0038] Optionally, the reinforcing ribs 140 are arranged in pairs, and each pair of reinforcing ribs is symmetrically distributed about the mid-plane of the chamber body 110 in the width direction. Figure 2 A schematic diagram of a chamber reinforcement structure 100 according to another embodiment of the present invention is shown. It can be understood that... Figure 1 and Figure 2 These are two images symmetrical about the centerline of the chamber. Specifically, they can be symmetrical about the centerline of the chamber. Figure 1 In the illustrated embodiment, holes are drilled symmetrically to the upper surrounding rock borehole of the chamber body 110, with the borehole positions also forming an angle α with the centerline of the chamber. Then, the first anchor bolt 120 is installed and grouting is performed. Similarly, based on the centerline of the chamber, and... Figure 1 In the illustrated embodiment, holes are drilled symmetrically at the lower surrounding rock borehole of the chamber body 110, with the borehole positions also forming an angle α with the centerline of the chamber. Then, the second anchor bolt 130 is installed and grouting is performed. After the installation of the anchor bolts as shown... Figure 2 Following the first anchor bolt 120 and the second anchor bolt 130 shown, reinforcing ribs 140 can be installed between the first anchor bolt 120 and the second anchor bolt 130. The two reinforcing ribs installed according to the above scheme are referred to as a pair of reinforcing ribs. These two reinforcing ribs are symmetrically distributed about the mid-plane of the chamber body 110 in the width direction. It can be understood that one or more pairs of reinforcing ribs can be installed using the above scheme for each certain distance extended longitudinally inward / outward along the chamber cross-section. The above installation work is repeated until the number of reinforcing ribs meets the requirements.

[0039] Therefore, the lateral stress can be effectively offset by symmetrically arranging reinforcing ribs, while the longitudinal stress can be enhanced to the maximum extent, thereby improving the stability of the chamber.

[0040] Preferably, the first anchor rod 120 and the second anchor rod 130 connected to each pair of reinforcing ribs 140 are inserted at equal angles on the chamber body 110. For example, the insertion angle is α degrees as described above, specifically, α can be 45 degrees. Thus, with equal insertion angles, the calculation process for the number of reinforcing ribs 140 is greatly simplified, while effectively improving construction efficiency.

[0041] Optionally, the number of reinforcing ribs 140 is proportional to the insertion angle. See also... Figure 1 or Figure 2It can be seen that by performing stress analysis and force decomposition on the reinforcing rib 140, the supporting effect of the reinforcing rib 140 is directly proportional to the cosine value of the angle, while the cosine value is inversely proportional to the size of the angle. Therefore, the smaller the insertion angle, the better the supporting effect of the reinforcing rib 140, and correspondingly, fewer reinforcing ribs 140 can be installed. Conversely, the larger the insertion angle, the worse the supporting effect of the reinforcing rib 140, and correspondingly, more reinforcing ribs 140 are needed to improve the supporting effect and ensure the stability of the chamber.

[0042] Optionally, when compressed air is stored inside the chamber body, the critical safety condition for the surrounding rock above the chamber body is: Where σ represents the in-situ stress of the upper surrounding rock, τ represents the shear strength of the sidewall of the chamber body, L represents the effective area of ​​the sidewall, F represents the bearing capacity of the reinforcing ribs, and α i Let α represent the insertion angle of the first and second anchor rods connected to the i-th pair of reinforcing ribs on the chamber body, n represent the number of reinforcing ribs, P represent the pressure of compressed air, and S represent the area of ​​the upper surrounding rock. It can be understood that in α... i When the angle is fixed, the above formula can be simplified to: Figure 3 A schematic diagram of the forces acting on the upper surrounding rock of a chamber body according to an embodiment of the present invention is shown.

[0043] In one specific embodiment, assuming the calculation is performed on a unit chamber length, take P = 10 MPa, α = 45°, σ = 6.3 MPa, τ = 3.5 MPa, and L = 10 m. 2 S = 10m 2 The tensile strength of the reinforcing rib 140 is designed to be 330 MPa. Taking a nominal diameter of 32 mm, the interface area is 804.2 mm². 2 F = σs, where s is the cross-sectional area of ​​the 140 stiffener. Substituting these data into the above formula, we can calculate n ≥ 1.06. When obtaining a decimal, we can round up (the integer should be a multiple of 2, because the stiffeners are symmetrical and should appear in pairs), which is equivalent to symmetrically placing two 140 stiffeners per meter of advance in the chamber.

[0044] This not only effectively ensures the stability of the chamber, but also takes into account the range of gas pressure changes and leaves sufficient safety redundancy, further ensuring the stability of the chamber when storing compressed air.

[0045] Optionally, the reinforcing ribs 140 are evenly distributed within the chamber body, and the distance between each pair of reinforcing ribs 140 is equal to the unit advance distance divided by the number of reinforcing ribs 140 per unit advance distance. Specifically, it can be considered that for a 1m advance, the distance between each pair of reinforcing ribs 140 is equal to 1m divided by the number of reinforcing ribs 140 at that distance. This effectively ensures the rationality of the number of reinforcing ribs 140, thereby ensuring the stability of the chamber.

[0046] Alternatively, the spacing between the stiffeners 140 can also be calculated using the following formula. Where d represents the spacing between two adjacent pairs of reinforcing ribs 140, and D represents the length of the chamber.

[0047] Optionally, the surface of the reinforcing rib 140 is coated with an anti-corrosion material.

[0048] It is understandable that when a chamber is used to store compressed air, the air contains a large amount of moisture, and the reinforcing rib 140 is easily corroded due to long-term exposure to the air. Over time, the degree of corrosion gradually worsens, thus affecting the supporting effect of the reinforcing rib 140. Therefore, an anti-corrosion material can be coated on the surface of the reinforcing rib 140 to protect it, ensure its supporting effect, and thus guarantee the stability of the chamber. It should be noted that any existing or future material that can achieve anti-corrosion function can be used to coat the surface of the reinforcing rib 140 to protect it; no limitation is placed on the anti-corrosion material here.

[0049] According to a second aspect of the invention, a method for reinforcing a chamber is also provided for laying the chamber reinforcement structure as described above. Figure 4 A schematic flowchart of a chamber reinforcement method 400 according to an embodiment of the present invention is shown. Figure 4 As shown, method 400 may include the following steps.

[0050] Step S410: Insert the first anchor rod into the upper surrounding rock of the chamber body.

[0051] Step S420: Insert the second anchor rod into the lower surrounding rock of the chamber body.

[0052] Step S430: Connect reinforcing ribs between the first anchor rod and the second anchor rod.

[0053] Optionally, the method may also include:

[0054] Step S440: Obtain the maximum gas pressure that the chamber body withstands when storing compressed air;

[0055] Step S450: Based on the maximum gas pressure and the internal structure of the chamber body, determine the number of reinforcing ribs and the insertion angle of the first anchor rod and the second anchor rod into the chamber body.

[0056] Those skilled in the art can understand the specific details and beneficial effects of the chamber reinforcement method by reading the above description of the relevant chamber reinforcement structure, and will not be repeated here for the sake of brevity.

[0057] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A method for reinforcing a chamber, characterized in that, Used for laying the reinforced structure of the chamber, the reinforced structure of the chamber includes the chamber body, the first anchor rod, the second anchor rod, and the reinforcing rib; The first end of the first anchor rod is inserted into the upper surrounding rock of the chamber body; The first end of the second anchor rod is inserted into the lower surrounding rock of the chamber body; The two ends of the reinforcing rib are respectively connected to the second end of the first anchor rod and the second end of the second anchor rod; Holes are drilled in the lower surrounding rock and the upper surrounding rock of the chamber body, respectively, and the angle between the position of the drill hole and the centerline of the chamber is the insertion angle. The number of reinforcing ribs is proportional to the insertion angle; When compressed air is stored inside the chamber body, the critical safety condition of the surrounding rock above the chamber body is: ,in, This indicates the geostress of the upper surrounding rock. This indicates the shear strength of the sidewall of the chamber body. This represents the effective area of ​​the sidewall. This indicates the load-bearing capacity of the reinforcing rib. Indicates the first The insertion angle of the first and second anchor rods connected to the reinforcing ribs on the main body of the chamber. Indicates the number of the reinforcing ribs. This indicates the pressure of the compressed air. This represents the area of ​​the upper surrounding rock; The method includes: The first anchor rod is inserted into the upper surrounding rock of the chamber body; The second anchor rod is inserted into the lower surrounding rock of the chamber body; The reinforcing rib is connected between the first anchor rod and the second anchor rod; Also includes: Obtain the maximum gas pressure that the chamber body withstands when storing compressed air; Based on the maximum gas pressure and the internal structure of the chamber body, the number of reinforcing ribs and the insertion angle of the first anchor rod and the second anchor rod into the chamber body are determined.

2. The chamber reinforcement method as described in claim 1, characterized in that, The reinforcing ribs are arranged in pairs, and each pair of reinforcing ribs is symmetrically distributed about the mid-plane of the width direction of the chamber body.

3. The chamber reinforcement method as described in claim 2, characterized in that, The first and second anchor rods connected to each pair of reinforcing ribs are inserted at equal angles on the main body of the chamber.

4. The chamber reinforcement method according to any one of claims 1 to 3, characterized in that, The reinforcing ribs are evenly distributed in the chamber body, and the distance between each pair of reinforcing ribs is equal to the unit advance distance divided by the number of reinforcing ribs in the unit advance distance.

5. The chamber reinforcement method according to any one of claims 1 to 3, characterized in that, The surface of the reinforcing rib is coated with an anti-corrosion material.

6. The chamber reinforcement method according to any one of claims 1 to 3, characterized in that, The two ends of the reinforcing rib are respectively bolted to the second end of the first anchor rod and the second end of the second anchor rod.

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