A spare fastening structure arranged on the gate slot of a high-pressure gate valve type gate

Abstract

The present invention discloses a spare fastening structure provided on the gate slot of a high-pressure gate valve type gate. A sealing cover plate is provided at the top of the gate slot, and a gate slot connection flange is provided on the gate slot. The gate slot connection flange and the sealing cover plate are fixed by a plurality of connection bolts; the spare fastening structure includes a plurality of connection components, and each connection component includes a U-shaped block and a tightening bolt; the U-shaped block includes an upper limb of the U-shaped block, a vertical limb body of the U-shaped block, and a lower limb of the U-shaped block. An internally threaded through hole is provided on the upper limb of the U-shaped block, and the tightening bolt is threadedly engaged with the internally threaded through hole and abuts against the sealing cover plate; a convex platform is provided on the upper surface of the lower limb of the U-shaped block, and the convex platform extends towards the lower surface of the upper limb of the U-shaped block. The edges of the gate slot connection flange and the sealing cover plate are arranged between the convex platform and the upper limb of the U-shaped block, and the upper surface of the convex platform is parallel to and abuts against the lower surface of the gate slot connection flange. When the connection bolts fail, this spare fastening structure can replace the connection function of the failed bolts and warn of the occurrence of an accident.

Description

Technical Field

[0001] The present invention belongs to the technical field of water conservancy and hydropower engineering, and particularly relates to a spare fastening structure arranged on the gate slot of a high-pressure gate valve type gate. Background Art

[0002] In hydropower projects, high-pressure gate valve type gates are often arranged in flood discharge and water diversion channels. Especially in the tailrace gate chambers of pumped storage power stations, high-pressure gate valve type emergency gates are provided. Generally, sealing covers are provided at the top of these gate slots. The sealing covers are often made of steel structures and are connected to the connecting flange of the gate slot through pre-tightening with nuts and bolts. Sealing rings are arranged therebetween to prevent high-pressure water leakage, and the connecting bolts often adopt high-strength bolts. During operation, the connecting bolts always bear relatively high tensile stress. Due to bolt quality problems or delayed fracture of high-strength bolts, etc., there is a possibility of bolt fracture. The bolt fracture causes the connection between the sealing cover and the gate slot to fail, resulting in the high-pressure water in the flow channel flushing open the cover plate, and a large amount of high-pressure water will quickly flood the powerhouse or machine room, causing serious accidents of casualties and equipment damage.

[0003] Currently, in order to prevent the flood of the powerhouse or machine room caused by the failure of the connecting bolts of the sealing cover, the method of increasing the safety factor of the bolts is often adopted. This method cannot prevent the accidents of flooding the powerhouse or machine room caused by bolt fracture due to quality problems or delayed fracture during use. Another proposed solution is to add an emergency gate that can be closed under flowing water on the water inlet side of the sealing cover. For the sealing cover of the emergency gate slot in the tailrace gate chamber of a pumped storage power station, that is, an emergency gate that can be closed under flowing water is arranged at the tailrace outlet, and the time for emergency gate closing is minimized to prevent the expansion of accidents caused by the failure of the connecting bolts of the sealing cover. This solution is restricted by the time for emergency gate closing. When the high-pressure water in the flow channel flushes open the cover plate, a large amount of high-pressure water quickly floods the powerhouse or machine room, and this solution cannot prevent the accident of flooding the powerhouse or machine room.

[0004] In view of the above situation, considering that the current bolt quality is generally not high, in case of the fracture of the connecting bolts, safety measures should be available to avoid major secondary disasters. Summary of the Invention

[0005] The present invention aims to provide a spare fastening structure arranged on the gate slot of a high-pressure gate valve type gate, which is used for the emergency gate in the tailrace gate chamber of a pumped storage power station. When the connecting bolts on the sealing cover at the top of the gate slot fail, this spare fastening structure can replace the connection function of the failed bolts and give an early warning of the accident.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A spare fastening structure arranged on the gate slot of a high-pressure gate valve type gate. A sealing cover plate is provided at the top of the gate slot, and a gate slot connecting flange is provided on the gate slot. The gate slot connecting flange and the sealing cover plate are fixed by a plurality of connecting bolts; its structural characteristics are: the spare fastening structure includes a plurality of connecting components, and the connecting components include U-shaped blocks and tightening bolts; the U-shaped block includes an upper limb of the U-shaped block, a vertical limb of the U-shaped block, and a lower limb of the U-shaped block. An internally threaded through hole is provided on the upper limb of the U-shaped block, and the tightening bolt is threadedly engaged with the internally threaded through hole and abuts against the upper surface of the sealing cover plate; a convex platform is provided on the upper surface of the lower limb of the U-shaped block, and the convex platform extends towards the lower surface of the upper limb of the U-shaped block. The edges of the gate slot connecting flange and the sealing cover plate are arranged between the convex platform and the upper limb of the U-shaped block. The upper surface of the convex platform is parallel to and abuts against the lower surface of the gate slot connecting flange; the center line of the force-bearing position on the upper surface of the convex platform coincides with the center line of the tightening bolt, and the center lines of the tightening bolt and the adjacent connecting bolt are respectively at equal vertical distances from the edge of the sealing cover plate; when the connecting bolt is in a normal state, the external thread of the tightening bolt contacts the internal thread of the upper limb of the U-shaped block, but neither of them is deformed.

[0008] A boss is provided on the upper surface of the lower limb of the U-shaped block. Only the surface of the boss needs to be finely processed, which not only makes the surface of the boss contact evenly with the lower surface of the connecting flange of the gate slot, but also makes the force contact position accurate. After the connecting component is installed in place, rotate the tightening bolt to make it contact with the sealing cover plate without damaging the anti-corrosion coating of the sealing cover plate. Under normal operating conditions, the connecting bolts are in a pre-tightened stress state, while the connecting component is under less stress and is in a standby state, which can play a safety backup role. When one or more connecting bolts fail, the sealing cover plate at the failed connecting bolt will undergo an opening deformation under the water pressure. The opening deformation causes the tightening bolt to be subjected to a compressive stress, and the load is transmitted through the thread to the U-shaped block. Through the force transmission of the U-shaped block, the U-shaped block, the sealing cover plate, and the connecting flange plate of the gate slot form a force balance. The connecting component undertakes the role of the original failed connecting bolt, which can prevent the high-pressure water flow from flushing open the sealing cover plate due to the successive failure of the connecting bolts one by one, and only a small amount of water leakage occurs at the connection of the sealing cover plate, which can warn of the occurrence of an accident. The connecting component of the present invention changes the tensile stress of the original connecting bolt to the compressive stress of the tightening bolt, optimizing the stress state of the tightening bolt. The installation position of the connecting component should be set according to the layout of the connecting bolts. Both the U-shaped block and the tightening bolt must be designed and calculated. The calculation should be based on the load that needs to be borne by the number of connecting bolts that may be replaced due to failure and the above force transmission process, and calculate the compressive stress of the tightening bolt, the stresses of each item of the thread of the tightening bolt, the shear stress and bending stress of the upper and lower limbs of the U-shaped block, and the tensile stress of the vertical limb of the U-shaped block. Each stress should meet the requirements of relevant regulations and specifications. The connecting component of the present invention is convenient to install and use and has a low cost, and can be widely applied to high-pressure sealed steel structures connected by bolts. For existing equipment, it can also be installed and applied without changing the original design layout, and has significant social and economic benefits.

[0009] According to the embodiments of the present invention, the present invention can be further optimized. The following are the technical solutions formed after optimization:

[0010] Specifically, a plurality of the connecting bolts are evenly arranged on the sealing cover plate, and the connecting component is provided between adjacent two connecting bolts.

[0011] Specifically, the tightening bolt is a full-thread bolt, and the specification and material of the tightening bolt are the same as those of the connecting bolt.

[0012] Due to structural design reasons (such as the bottom of the connecting flange of the gate slot is provided with reinforcing ribs and the connecting component cannot be set), when a connecting component cannot be set between certain two connecting bolts, preferably, a plurality of the connecting bolts are divided into a plurality of connecting bolt groups, and every two or three adjacent connecting bolts are used as a connecting bolt group, and the connecting component is provided between adjacent two connecting bolt groups. At this time, the specifications of the tightening bolt and the U-shaped block should be increased, and the material should be strengthened to ensure that one connecting component can replace two or three failed connecting bolts.

[0013] When it is not possible to arrange a connection component between any two connecting bolts, preferably, the connection component further includes a first cylinder body and a second cylinder body. Both the first cylinder body and the second cylinder body are cylinder structures with one end closed, the other end open and an inner cavity provided inside. The top of the connecting bolt is arranged in the inner cavity of the first cylinder body, and the open end of the first cylinder body abuts against the sealing cover plate. The bottom of the connecting bolt is arranged in the inner cavity of the second cylinder body, and the open end of the second cylinder body abuts against the gate groove connection flange. The edges of the gate groove connection flange and the sealing cover plate, as well as the first cylinder body and the second cylinder body, are all arranged between the convex platform and the upper limbs of the U-shaped block. The tightening bolt abuts against the closed end of the first cylinder body, and the upper surface of the convex platform is parallel to and abuts against the closed end of the second cylinder body. The first cylinder body and the second cylinder body need to have a certain wall thickness. By setting the first cylinder body and the second cylinder body, an installation space is provided for the U-shaped block. The U-shaped block, the tightening bolt, the first cylinder body and the second cylinder body all need to be designed and calculated. The calculation should be based on the load received by the connecting bolt and the relevant force transmission process, and calculate the compressive stress of the tightening bolt, the stresses of each item of the threads of the tightening bolt, the compressive stresses of the first cylinder body and the second cylinder body, the shear stresses of the upper and lower limbs of the U-shaped block, the bending stress and the tensile stress of the vertical limb of the U-shaped block, etc. Each stress should meet the requirements of relevant regulations and specifications.

[0014] Specifically, each of the connecting bolts is provided with the connection component, and the specification and material of the tightening bolt are the same as those of the connecting bolt.

[0015] Specifically, the U-shaped block is made of forged steel material.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. A spare fastening structure provided on the gate groove of a high-pressure gate valve type gate in the present invention can preferably prevent major malignant accidents such as flooding of the powerhouse or machine room caused by the failure of the connecting bolts of the sealing cover plate at the top of the gate groove of the high-pressure gate valve type gate in the hydropower project when the connecting bolt failure warning accident occurs.

[0018] 2. A spare fastening structure provided on the gate groove of a high-pressure gate valve type gate in the present invention is convenient for installation and use and has a low cost. It can be widely applied to high-pressure sealed steel structures connected by bolts. For existing equipment, it can also be installed and applied without changing the original design layout, with remarkable social and economic benefits.

[0019] 3. A spare fastening structure provided on the gate groove of a high-pressure gate valve type gate in the present invention changes the tensile stress received by the original connecting bolt into the compressive stress of the tightening bolt through the arranged connection component, optimizing the stress state of the tightening bolt. Description of the Drawings

[0020] Figure 1Schematic diagram of an embodiment of a spare fastening structure provided on the gate slot of a high-pressure gate valve type gate;

[0021] Figure 2 is Figure 1 Schematic diagram of the sectional structure at A-A in;

[0022] Figure 3 is Figure 2 Schematic diagram of the partial enlarged structure where the U-shaped block is provided in;

[0023] Figure 4 is Figure 1 Schematic diagram of the structure of the U-shaped block in;

[0024] Figure 5 is Figure 3 Schematic diagram of the force between the U-shaped block, the tightening bolt, the sealing cover plate and the gate slot connecting flange in;

[0025] Figure 6 Schematic diagram of another embodiment of a spare fastening structure provided on the gate slot of a high-pressure gate valve type gate according to the present invention;

[0026] Figure 7 is Figure 6 Schematic diagram of the sectional structure at B-B in;

[0027] Figure 8 is Figure 7 Schematic diagram of the partial enlarged structure where the U-shaped block is provided in.

[0028] In the figure: 1 - connecting bolt; 2 - gate slot connecting flange; 3 - sealing cover plate; 4 - tightening bolt; 5 - U-shaped block; 51 - upper limb of U-shaped block; 52 - vertical limb of U-shaped block; 53 - lower limb of U-shaped block; 54 - convex platform; 6 - first cylinder; 7 - second cylinder. Detailed implementation manners

[0029] The present invention will be described in detail below with reference to the drawings and in combination with embodiments. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. For the sake of convenience of description, words such as "upper", "lower", "left", and "right" hereinafter only represent the same directions as the upper, lower, left, and right directions of the drawings themselves, and do not limit the structure.

[0030] Embodiment 1:

[0031] As Figure 1 and Figure 2As shown, a spare fastening structure is provided on the gate slot of a high-pressure gate valve type gate. A sealing cover plate 3 is provided at the top of the gate slot. A gate slot connection flange 2 is provided on the gate slot. The gate slot connection flange 2 and the sealing cover plate 3 are fixed by a plurality of connecting bolts 1. The spare fastening structure includes a plurality of connecting components. The plurality of connecting bolts 1 are evenly arranged on the sealing cover plate 3, and the connecting components are provided between adjacent two connecting bolts 1. Figure 1 Only one connecting component is schematically shown on the long side and the short side of the sealing cover plate respectively. As Figure 3 and Figure 4 shown, the connecting component includes a U-shaped block 5 and a tightening bolt 4. The U-shaped block 5 includes a U-shaped block upper limb 51, a U-shaped block vertical limb body 52 and a U-shaped block lower limb 53. An internal thread through hole is provided on the U-shaped block upper limb 51. The tightening bolt 4 is threadedly engaged with the internal thread through hole and abuts against the upper surface of the sealing cover plate 3. A boss 54 is provided on the upper surface of the U-shaped block lower limb 53. The boss 54 extends towards the lower surface of the U-shaped block upper limb 51. The edges of the gate slot connection flange 2 and the sealing cover plate 3 are arranged between the boss 54 and the U-shaped block upper limb 51. The upper surface of the boss 54 is parallel to and abuts against the lower surface of the gate slot connection flange 2. The tightening bolt 4 is a full-thread bolt. The specification and material of the tightening bolt 4 are the same as those of the connecting bolt 1. The U-shaped block 5 is a square forged steel part.

[0032] By providing the boss 54 on the upper surface of the U-shaped block lower limb 53, only the surface of the boss 54 needs to be finely processed. This not only makes the contact between the surface of the boss 54 and the lower surface of the gate slot connection flange 2 uniform, but also makes the force-bearing contact position accurate. After the connecting component is installed in place, rotate the tightening bolt 4 to make it contact with the sealing cover plate 3 without damaging the anti-corrosion coating of the sealing cover plate 3. When the connecting component is stressed, the center line of the force-bearing position on the upper surface of the boss 54 coincides with the center line of the tightening bolt 4. The center lines of the tightening bolt 4 and the adjacent connecting bolt 1 are respectively at equal vertical distances from the edge of the sealing cover plate 3. Under normal operating conditions, the connecting bolt 1 is in a pre-tightened stressed state, while the connecting component is less stressed and in a standby state, which can play a safety backup role. When one or more connecting bolts 1 fail, the sealing cover plate 3 at the position of the failed connecting bolt 1 will undergo an opening deformation under the water pressure. The opening deformation causes the tightening bolt 4 to be subjected to a compressive stress, and the load is transmitted to the U-shaped block 5 through the thread, as Figure 5As shown in the figure, through the force transmission of the U-shaped block 5, the U-shaped block 5, the sealing cover plate 3, and the door groove connecting flange 2 form a force balance. The connecting component undertakes the role of the original failed connecting bolt 1, which can prevent the high-pressure water flow from flushing open the sealing cover plate 3 due to the successive failure of the connecting bolts 1 one by one, and only a small amount of water leakage occurs at the connection of the sealing cover plate 3, which can warn of the occurrence of an accident. The connecting component of the present invention changes the tensile stress of the original connecting bolt 1 into the compressive stress of the tightening bolt 4, optimizing the stress state of the tightening bolt 4. Both the U-shaped block 5 and the tightening bolt 4 must be designed and calculated. The calculation should be based on the load that needs to be borne by the number of connecting bolts 1 that may fail to be replaced and the above force transmission process, and calculate the compressive stress of the tightening bolt 4, the stresses of each thread of the tightening bolt 4, the shear stress, bending stress of the upper limb 51 and the lower limb 53 of the U-shaped block, and the tensile stress of the vertical limb 52 of the U-shaped block, etc. Each stress should meet the requirements of relevant regulations and specifications. The connecting component of the present invention is convenient to install and use and has a low cost, and can be widely applied to high-pressure sealed steel structures with bolt connections. For existing equipment, it can also be installed and applied without changing the original design layout, with significant social and economic benefits.

[0033] Embodiment 2:

[0034] When it is impossible to arrange a U-shaped block 5 between two adjacent connecting bolts 1 in Embodiment 1, as Figure 6 , Figure 7 and Figure 8 shown, the connecting component further includes a first cylinder 6 and a second cylinder 7. Both the first cylinder 6 and the second cylinder 7 are cylinder structures with one end closed and the other end open and having an inner cavity. The top of the connecting bolt 1 is arranged in the inner cavity of the first cylinder 6, and the open end of the first cylinder 6 abuts against the sealing cover plate 3. The bottom of the connecting bolt 1 is arranged in the inner cavity of the second cylinder 7, and the open end of the second cylinder 7 abuts against the door groove connecting flange 2. The edges of the door groove connecting flange 2 and the sealing cover plate 3, the first cylinder 6 and the second cylinder 7 are all arranged between the boss 54 and the upper limb 51 of the U-shaped block. The tightening bolt 4 abuts against the closed end of the first cylinder 6, and the upper surface of the boss 54 is parallel to and abuts against the closed end of the second cylinder 7. Each connecting bolt 1 is provided with the connecting component, and the specifications and materials of the tightening bolt 4 are the same as those of the connecting bolt 1. Figure 5 Only one connecting component is schematically shown on the long side and the short side of the sealing cover plate respectively in

[0035] The content illustrated in the above embodiments should be understood that these embodiments are only used to more clearly illustrate the present invention, rather than to limit the scope of the present invention. After reading the present invention, various equivalent forms of modification of these embodiments by those skilled in the art all fall within the scope defined by the appended claims of the present invention.

Claims

1. A spare fastening structure arranged on the gate slot of a high-pressure gate valve type gate. A sealing cover plate (3) is provided at the top of the gate slot, and a gate slot connecting flange (2) is provided on the gate slot. The gate slot connecting flange (2) and the sealing cover plate (3) are fixed by a plurality of connecting bolts (1); characterized in that: The spare fastening structure includes a plurality of connection components, and each connection component includes a U-shaped block (5) and a tightening bolt (4). The U-shaped block (5) includes an upper limb (51) of the U-shaped block, a vertical limb (52) of the U-shaped block, and a lower limb (53) of the U-shaped block. An internally threaded through hole is provided on the upper limb (51) of the U-shaped block. The tightening bolt (4) is connected to the internally threaded through hole by thread fit and abuts against the upper surface of the sealing cover plate (3). A boss (54) is provided on the upper surface of the lower limb (53) of the U-shaped block. The boss (54) extends towards the lower surface of the upper limb (51) of the U-shaped block. The edges of the door groove connecting flange (2) and the sealing cover plate (3) are arranged between the boss (54) and the upper limb (51) of the U-shaped block. The upper surface of the boss (54) is parallel to and abuts against the lower surface of the door groove connecting flange (2). The center line of the force-bearing position on the upper surface of the boss (54) coincides with the center line of the tightening bolt (4). The center lines of the tightening bolt (4) and the adjacent connecting bolt (1) are respectively at equal vertical distances from the edge of the sealing cover plate (3). When the connecting bolt (1) is in a normal state, the external thread of the tightening bolt (4) is in contact with the internal thread of the upper limb (51) of the U-shaped block, but neither of them is deformed.

2. The spare fastening structure arranged on the gate slot of the high-pressure gate valve type gate according to claim 1, characterized in that: A plurality of the connecting bolts (1) are evenly arranged on the sealing cover plate (3), and a connection component is provided between every two adjacent connecting bolts (1).

3. The spare fastening structure arranged on the gate slot of the high-pressure gate valve type gate according to claim 2, characterized in that: The tightening bolt (4) is a full-thread bolt, and the specification and material of the tightening bolt (4) are the same as those of the connecting bolt (1).

4. The spare fastening structure arranged on the gate slot of the high-pressure gate valve type gate according to claim 1, characterized in that: The plurality of connecting bolts (1) are divided into a plurality of connecting bolt groups. Every two or three adjacent connecting bolts (1) form a connecting bolt group, and the connection component is arranged between two adjacent connecting bolt groups.

5. The spare fastening structure arranged on the gate slot of the high-pressure gate valve type gate according to claim 1, characterized in that: The connection component further includes a first cylinder body (6) and a second cylinder body (7). Both the first cylinder body (6) and the second cylinder body (7) are cylinder structures with one end closed, the other end open and an inner cavity provided inside. The top of the connecting bolt (1) is arranged in the inner cavity of the first cylinder body (6), and the open end of the first cylinder body (6) abuts against the sealing cover plate (3). The bottom of the connecting bolt (1) is arranged in the inner cavity of the second cylinder body (7), and the open end of the second cylinder body (7) abuts against the door groove connecting flange (2). The edges of the door groove connecting flange (2) and the sealing cover plate (3), the first cylinder body (6) and the second cylinder body (7) are all arranged between the boss (54) and the upper limb (51) of the U-shaped block. The tightening bolt (4) abuts against the closed end of the first cylinder body (6), and the upper surface of the boss (54) is parallel to and abuts against the closed end of the second cylinder body (7).

6. The spare fastening structure arranged on the gate slot of the high-pressure gate valve type gate according to claim 5, characterized in that: Each connecting bolt (1) is provided with the connection component, and the specification and material of the tightening bolt (4) are the same as those of the connecting bolt (1).

7. The spare fastening structure provided on the gate slot of the high-pressure gate valve type gate according to any one of claims 1 to 6, characterized in that: The U-shaped block (5) is made of forged steel material.

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