A method and structure for improving the surge resistance of radial gates

Abstract

The present invention discloses a method and structure for improving the surge resistance of an arc gate. The present invention first transforms the gate into an exposed arc working gate with a water retaining breast wall upstream, and prevents surging water from flowing through the gate top through the water retaining breast wall; at the same time, two top water seals are arranged on the top of the arc gate to prevent surging flow from entering the gate top; two main and auxiliary upstream vent pipes are arranged on the lintel between the two top water seals to communicate with the air on the downstream surface of the breast wall top, and main and auxiliary side vent pipes are arranged on the gate wall below the two top water seals to communicate with the air on the top surface of the gate wall, and the air bag pressure formed by the surging flow is released through the vent pipe to reduce the damage of the surging flow to the top water seal; at the same time, inverted tooth-shaped anti-wave ribs are arranged on the lintel and the top of the arc gate to reduce the damage of the surging flow to the arc gate. The present invention effectively improves the safety and reliability of the gate. It can prevent the gate from being instantly unstable and damaged when a surge occurs, causing major engineering losses.

Description

Technical Field

[0001] The invention relates to a method and a structure for improving the surge resistance of a radial gate, belonging to the technical field of metal structures of water conservancy and hydropower engineering. Background Art

[0002] For high-panel dam or high-core dam hydropower projects with landslide surges, the arc-shaped working gates of the spillway or spillway tunnel are designed according to the normal water retaining height. Because the gate is an exposed-top structure, the surging water generated by the landslide surge will impact the gate and will generate negative pressure from the gate top, causing damage to the gate body. Since the height of the landslide surge is usually much higher than the normal water retaining height, some are more than 10m. If it is designed according to the water retaining height, the overall height of the arc-shaped working gate will be too high, some projects are close to 40m, the scale is too large, the technical difficulty is too much beyond the existing level, and the investment is also large; if the breast wall is set on the upstream side of the arc-shaped working gate of the spillway or spillway tunnel, the hinge position layout According to the traditional submerged arc gate body design, the bottom sill of the arc working gate of the spillway or spillway tunnel is the overflow surface, and the contact part between the outer edge of the arc gate and the overflow surface is approximately tangent. Under long-term flow conditions, if the bottom sill is damaged by the scouring of water flow, it may cause the arc working gate to rotate and be damaged under the action of its own weight; in addition, this type of arc gate is an exposed top type at ordinary times, and a submerged hole type when surge occurs. During the transition process of this working condition, a large amount of gas will be compressed, which will produce impact loads such as air bag explosion on the arc gate, which may cause the arc gate to become unstable and damaged instantly, causing major engineering losses. Therefore, the existing technology is still not perfect and needs to be further improved. Summary of the invention

[0003] The purpose of the present invention is to provide a method and structure for improving the surge resistance of arc-shaped gates, so as to improve the surge resistance of arc-shaped working gates, prevent the gates from instantaneously becoming unstable and damaging and causing major engineering losses, improve the safety and reliability of the gates, and thus overcome the shortcomings of the prior art.

[0004] To achieve the above object, the present invention adopts the following technical solution:

[0005] The present invention provides a method for improving the surge impact resistance of a curved gate. The method first transforms the gate into an exposed-top curved working gate with an upstream water retaining breast wall, and prevents surging water from flowing through the gate top through the water retaining breast wall; at the same time, two top water seals are arranged on the top of the curved gate to prevent surging flow from entering from the gate top; main and auxiliary two rows of upstream vent pipes are arranged on the lintel between the two top water seals to communicate with the air on the downstream surface of the breast wall top, and main and auxiliary side vent pipes are arranged on the gate wall below the two top water seals to communicate with the air on the top surface of the gate wall, and the air bag pressure formed by the surging flow is released through the vent pipe, thereby reducing the damage of the surging flow to the top water seal; at the same time, inverted tooth-shaped anti-wave ribs are arranged on the lintel and the top of the curved gate to reduce the damage of the surging flow to the curved gate.

[0006] In the aforementioned method for improving the surge resistance of the arc gate, the two top water seals at the top of the arc gate are both arranged at the top of the arc gate or the upper water seal is arranged on the lintel, and the lower water seal is arranged at the top of the arc gate.

[0007] In the aforementioned method for improving the surge resistance of arc gates, the arc gate adopts a four-main-beam straight-arm frame structure to improve the overall stiffness and stability of the arc gate; the four-main-beam straight-arm frame includes an upper main beam, a middle-upper main beam, a middle-lower main beam and a lower main beam arranged in a fan shape; one end of the four main beams is hinged to the support hinge, and the other end of the upper main beam is connected to the downstream surface of the arc gate top water seal to enhance the stiffness of the top of the arc gate and improve the arc gate's ability to resist surges and airbag impact loads; the other end of the middle-lower main beam is connected to the downstream surface of the arc gate at the position of the water pressure action line of the arc gate under normal water retaining conditions, and the center line of the middle-lower main beam is perpendicular to the support hinge bottom plate surface; the other end of the middle-upper main beam is supported at the middle position of the downstream surface of the arc gate between the upper main beam and the middle-lower main beam to play an overall strengthening role; the other end of the lower main beam is connected to the downstream surface of the bottom water seal of the arc gate to prevent the bottom water seal from deforming and leaking.

[0008] In the aforementioned method for improving the surge resistance of a radial gate, the strength design of the four-main-beam straight-arm frame is designed using a polar coordinate or rectangular coordinate model.

[0009] In the aforementioned method for improving the surge resistance of arc-shaped gates, the polar coordinate model uses the origin of the polar coordinates to represent the fulcrum of the support hinge, and draws a group of rays starting from the origin as continuous arms according to the length and angle relationship of the upper main beam, the middle upper main beam, the middle lower main beam and the lower main beam, and then draws an arc line with an arc length corresponding to the arc length of the arc gate water retaining surface to represent the arc gate as a continuous beam, and the intersection of the arc line and the divergent end of each ray corresponds to the fulcrum position of the upper main beam, the middle upper main beam, the middle lower main beam and the lower main beam and the arc gate, and finally draws a gradient line with the origin as the center as the pressure line acting on the arc gate, thus completing the establishment of the polar coordinate model, and the shape of the polar coordinate model is a plane sector.

[0010] In the aforementioned method for improving the surge resistance of arc gates, the rectangular coordinate model is: the horizontal coordinate represents the arc length of the arc gate, and the vertical coordinate represents the water pressure; when establishing the rectangular coordinate model, first mark the arc length S1 between the top of the arc gate and the upper main beam support, the arc lengths S2, S3, S4 between the adjacent support positions of the middle upper main beam, the middle lower main beam and the lower main beam, and the arc length S5 between the support point of the lower main beam and the bottom of the arc gate on the horizontal coordinate, and then mark the values ​​of the water pressure borne by the top of the arc gate, each support point and the bottom of the arc gate on the rectangular coordinate, and then connect the values ​​of the water pressure borne by the top of the arc gate, each support point and the bottom of the arc gate, so as to complete the establishment of the rectangular coordinate model; the shape of the rectangular coordinate model is a right triangle or a right trapezoid.

[0011] The structure for improving the surge resistance of a radial gate according to the method for improving the surge resistance of a radial gate of the present invention comprises an arc gate; a water retaining breast wall is provided on the upstream side of the top of the arc gate, and a lintel is provided on the bottom of the downstream side of the water retaining breast wall; an upper water seal and a lower water seal are provided at the contact surface between the top of the arc gate and the lintel, and a group of water seal exhaust main pipes and a group of water seal exhaust auxiliary pipes are provided in the water retaining breast wall; the water seal exhaust main pipe is provided with two air inlets, one of which is located on the downstream side of the lintel at the bottom of the lower water seal, and the other is located on the lower side of the lintel. The bottom surface of the lintel; the air inlet of the water seal exhaust auxiliary pipe is located on the upper inclined surface of the lintel between the upper water seal and the lower water seal; the exhaust outlets of the water seal exhaust main pipe and the water seal exhaust auxiliary pipe are both located on the back water surface of the upper part of the breast wall; side exhaust main pipes and side exhaust auxiliary pipes are provided in the gate walls on both sides of the arc gate; the air inlet of the side exhaust main pipe is located on the end face of the gate wall below the lower water seal close to the arc gate; the air inlet of the side exhaust auxiliary pipe is located on the end face of the gate wall between the upper water seal and the lower water seal close to the arc gate; the exhaust outlets of the side exhaust main pipe and the side exhaust auxiliary pipe are both located on the top surface of the gate wall.

[0012] In the aforementioned structure for improving the surge resistance of the arc gate, the top of the arc gate adopts a rounded inverted V-shaped closed structure; a group of inverted tooth-shaped wave-resistant ribs are provided on the upstream side of the top of the arc gate and the downstream side of the lintel.

[0013] In the aforementioned structure for improving the surge resistance of the arc gate, the back water surface of the arc gate is provided with a four-main beam straight arm frame consisting of an upper main beam, a middle upper main beam, a middle lower main beam and a lower main beam arranged in a fan shape and hinged with a support hinge.

[0014] In the aforementioned structure for improving the surge resistance of the arc gate, the upper main beam, the middle upper main beam, the middle lower main beam and one end of the lower main beam are all connected to the support hinge; the other end of the upper main beam is connected to the downstream surface of the upper and lower water seals of the arc gate, the other end of the middle lower main beam is connected to the downstream surface of the arc gate at the water pressure action line of the arc gate under normal water retaining conditions, and the center line of the middle lower main beam is perpendicular to the bottom plate of the support hinge, the other end of the middle upper main beam is connected to the downstream surface of the arc gate in the middle position between the upper main beam and the middle lower main beam, and the other end of the lower main beam is connected to the downstream surface of the bottom water seal of the arc gate.

[0015] Due to the adoption of the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0016] 1. A breast wall with a top elevation greater than the highest gushing water level is set in front of the arc gate. The hinge arrangement is in accordance with the principle of exposed top arc working gate in the "Design Specifications for Steel Gates of Hydropower Projects" (NB 35055). When operating at normal water level, the gate is the same as the traditional exposed top arc working gate. When landslide surge occurs, the breast wall is used to block water to ensure that the gushing water cannot flow through the gate top.

[0017] 2. The arc gate adopts two water seals set up in the front and back upper and lower parts on the top of the gate or one water seal is set up on the lintel and the top of the gate to prevent the gushing water from jetting from the top of the gate. A set of water seal air pipes are set up on the lintel between the two water seals to lead to the downstream end face of the top of the breast wall to communicate with the air. A set of side air pipes are symmetrically set up on the gate walls on both sides at the corresponding position between the two water seals to lead to the top end face of the gate wall to communicate with the air. The top of the gate adopts an inverted V-shaped closed structure with rounded upper part, and the lintel and the top of the gate are provided with inverted tooth-shaped anti-wave ribs, so that the air bag pressure formed by the huge gushing water can be released through the water seal air pipe and the side air pipe, reducing the damage to the top of the gate and its top water seal.

[0018] 3. The arc gate adopts a four-main beam straight arm frame structure. An upper main beam is set at the top water seal of the gate to enhance the top stiffness of the gate leaf, effectively improving the ability of the gate top to resist water gushing and airbag impact loads. A middle and lower main beam is set at the position of the water pressure action line of the gate under normal water retaining conditions. The center line of the middle and lower main beam is perpendicular to the hinge bottom plate. A middle and upper main beam is set in the middle position between the upper main beam and the middle and lower main beam, and a lower main beam is set at the bottom water seal position of the lower part of the gate. The overall stiffness and stability of the gate are improved through the multi-main beam arm structure.

[0019] 4. Calculation model for load distribution of each frame of the arc gate: Under normal working conditions, the load is considered according to the water pressure from the junction of the lower water seal support plate and the arc gate panel to the bottom sill of the arc gate, and the main beam is regarded as a continuous support, forming four continuous supports from top to bottom, namely upper, middle-upper, middle-lower and lower. The entire door leaf is regarded as a continuous beam. The calculation model for load distribution of each frame of the arc gate under normal working conditions is a double-cantilever four-support continuous beam under the action of triangular linear load; under landslide and water gushing conditions, the load under normal working conditions + (the highest water level of landslide water gushing to the junction of the top water seal support plate and the arc gate panel) water pressure difference uniformly distributed load is considered. The calculation model for load distribution of each frame of the arc gate under landslide and water gushing conditions is a double-cantilever four-support continuous beam under the action of trapezoidal linear load. Through the above method, the complex spatial frame structural mechanical shape of the four main beams and straight arms is converted into a plane mechanical shape, which simplifies the design procedure and effectively improves the design efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention;

[0021] Figure 2 yes Figure 1 Partial enlarged view of the water seal and exhaust pipes;

[0022] Figure 3 yes Figure 2 A three-dimensional schematic diagram of

[0023] Figure 4 This is a schematic diagram of the water seal being installed on the door lintel.

[0024] Figure 5 This is a schematic diagram of the water pressure load distribution of the arc gate at normal water level;

[0025] Figure 6 This is a simplified diagram for calculating the hydraulic load of the arc gate at normal water level in a plane system;

[0026] Figure 7 It is a schematic diagram of the arc gate water pressure load distribution in the landslide water gushing condition;

[0027] Figure 8 It is a simplified diagram for calculating the water pressure load of the arc gate under the condition of landslide water inrush in the plane system;

[0028] The markings in the figure are as follows: 1-arc gate, 2-water retaining breast wall, 3-door lintel, 4-upper water seal, 5-lower water seal, 6-water seal exhaust main pipe, 7-water seal exhaust auxiliary pipe, 8-gate wall, 9-side exhaust main pipe, 10-side exhaust auxiliary pipe, 11-inverted tooth-shaped anti-wave rib, 12-rounded, 13-upper main beam, 14-middle upper main beam, 15-middle lower main beam, 16-lower main beam, 17-hinge, 18-bottom water seal, 19-lower water seal support plate, 20-bottom sill. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0030] A method for improving the surge resistance of a radial gate according to the present invention is as follows: Figures 1 to 8 As shown, all the following arc-shaped working gates are referred to as arc gates for short. This method first transforms the gate into an exposed-top arc-shaped working gate with a water-retaining breast wall upstream, and prevents the gushing water from flowing through the gate top through the water-retaining breast wall; at the same time, two top water seals are set on the top of the arc gate to prevent the gushing flow from entering the gate top; two rows of main and auxiliary upstream vent pipes are set on the lintel between the two top water seals to connect with the air on the downstream surface of the breast wall top, and main and auxiliary side vent pipes are set on the gate wall below the two top water seals to connect with the air on the top surface of the gate wall, and the air bag pressure formed by the gushing flow is released through the vent pipe to reduce the damage of the gushing flow to the top water seal; at the same time, inverted tooth-shaped anti-wave ribs are set on the lintel and the top of the arc gate to reduce the damage of the gushing flow to the arc gate. The two top water seals on the top of the arc gate are both set on the top of the arc gate, or the upper water seal is set on the lintel, and the lower water seal is set on the top of the arc gate.

[0031] like Figure 1As shown, the arc gate adopts a four-main-beam straight-arm frame structure to improve the overall rigidity and stability of the arc gate; the four-main-beam straight-arm frame includes an upper main beam, a middle-upper main beam, a middle-lower main beam and a lower main beam arranged in a fan shape; one end of the four main beams is hinged with the support hinge, and the other end of the upper main beam is connected to the downstream surface of the top water seal of the arc gate to enhance the rigidity of the top of the arc gate and improve the arc gate's ability to resist surges and airbag impact loads; the other end of the middle-lower main beam is connected to the downstream surface of the arc gate at the position of the water pressure action line of the arc gate under normal water retaining conditions, and the center line of the middle-lower main beam is perpendicular to the support hinge bottom plate surface; the other end of the middle-upper main beam is supported at the middle position of the downstream surface of the arc gate between the upper main beam and the middle-lower main beam to play an overall strengthening role; the other end of the lower main beam is connected to the downstream surface of the bottom water seal of the arc gate to prevent the bottom water seal from deforming and leaking.

[0032] like Figures 5 to 8 As shown in the figure, the strength design of the four-main beam straight arm frame is designed using a polar coordinate or rectangular coordinate model. The polar coordinate model uses the origin of the polar coordinate to represent the fulcrum of the support hinge. According to the length and angle relationship of the upper main beam, the middle upper main beam, the middle lower main beam and the lower main beam, a group of rays starting from the origin are drawn as continuous arms. Then an arc with an arc length corresponding to the arc length of the arc gate retaining surface is drawn to represent the arc gate as a continuous beam. The intersection of the arc and the divergent end of each ray corresponds to the fulcrum position of the upper main beam, the middle upper main beam, the middle lower main beam and the lower main beam and the arc gate. Finally, a gradient line is drawn with the origin as the center as the pressure line acting on the arc gate, and the polar coordinate model is established. The shape of the polar coordinate model is a plane sector. The rectangular coordinate model is: the horizontal coordinate represents the arc length of the arc gate, and the vertical coordinate represents the water pressure; when establishing the rectangular coordinate model, first mark the arc length S1 between the top of the arc gate and the upper main beam support, the arc lengths S2, S3, S4 between the adjacent support positions of the middle upper main beam, the middle lower main beam and the lower main beam, and the arc length S5 between the support point of the lower main beam and the bottom of the arc gate on the horizontal coordinate, and then mark the values ​​of the water pressure borne by the top of the arc gate, each support point and the bottom of the arc gate on the rectangular coordinate, and then connect the values ​​of the water pressure borne by the top of the arc gate, each support point and the bottom of the arc gate to complete the establishment of the rectangular coordinate model; the shape of the rectangular coordinate model is a right triangle or a right trapezoid.

[0033] According to the above method for improving the surge resistance of the radial gate, a structure for improving the surge resistance of the radial gate of the present invention is formed, such as Figure 1 to Figure 4As shown, it includes an arc door 1; a water retaining breast wall 2 is provided on the upstream side of the top of the arc door 1, and a door lintel 3 is provided on the bottom of the downstream side of the water retaining breast wall 2; an upper water seal 4 and a lower water seal 5 are provided at the contact surface between the top of the arc door 1 and the door lintel 3, and a group of water seal exhaust main pipes 6 and a group of water seal exhaust auxiliary pipes 7 are provided in the water retaining breast wall 2; the water seal exhaust main pipe 6 is provided with two air inlets, one of which is located on the downstream side of the door lintel 3 at the bottom of the lower water seal 5, and the other air inlet is located on the bottom surface of the door lintel 3; the air inlet of the water seal exhaust auxiliary pipe 7 is located between the upper water seal 4 and the lower water seal 5. The upper inclined surface of the lintel 3 between the upper water seal 4 and the lower water seal 5; the exhaust ports of the water seal exhaust main pipe 6 and the water seal exhaust auxiliary pipe 7 are both located on the back surface of the upper part of the water retaining breast wall 2; the side exhaust main pipe 9 and the side exhaust auxiliary pipe 10 are both provided in the gate walls 8 on both sides of the arc gate 1; the air inlet of the side exhaust main pipe 9 is located on the end face of the gate wall 8 on the side close to the arc gate 1 below the lower water seal 5; the air inlet of the side exhaust auxiliary pipe 10 is located on the end face of the gate wall 8 on the side close to the arc gate 1 between the upper water seal 4 and the lower water seal 5; the exhaust ports of the side exhaust main pipe 9 and the side exhaust auxiliary pipe 10 are both located on the top surface of the gate wall 8. The top of the arc gate 1 adopts an inverted V-shaped closed structure with a chamfer 12; a group of inverted tooth-shaped anti-wave ribs 11 are provided on the upstream side of the top of the arc gate 1 and the downstream side of the lintel 3. The back surface of the arc gate 1 is provided with a four-main beam straight arm frame composed of an upper main beam 13, a middle upper main beam 14, a middle lower main beam 15 and a lower main beam 16 arranged in a fan shape, and is hinged to a support hinge 17. One end of the upper main beam 13, the middle upper main beam 14, the middle lower main beam 15 and the lower main beam 16 are all connected to the support hinge 17; the other end of the upper main beam 13 is connected to the downstream surface of the upper and lower water seals of the arc gate 1, the other end of the middle lower main beam 15 is connected to the downstream surface of the arc gate 1 at the water pressure action line of the arc gate 1 under normal water retaining working conditions, and the center line of the middle lower main beam 15 is perpendicular to the bottom plate of the support hinge 17, the other end of the middle upper main beam 14 is connected to the downstream surface of the arc gate 1 at the middle position between the upper main beam 13 and the middle lower main beam 15, and the other end of the lower main beam 16 is connected to the downstream surface of the bottom water seal 18 of the arc gate 1. Example

[0034] In this example, all arc-shaped working gates are referred to as arc gates. Figure 1 As shown, a water retaining breast wall 2 with a top elevation greater than the highest water level is set in front of the arc gate 1. A lintel 3 is set at the bottom of the downstream side of the water retaining breast wall 2; Figure 2 and Figure 3 As shown, an upper water seal 4 and a lower water seal 5 are provided on the upstream side of the top arc door panel of the arc door 1; the upper water seal 4 and the lower water seal 5 can be all provided on the top arc door panel of the arc door 1, or can be provided as shown in FIG. Figure 4 As shown, the upper water seal 4 is arranged on the door lintel 3. Both the upper and lower water seals are P-type water seals; when both upper and lower water seals are arranged on the top arc door panel of the arc door 1, as shown in FIG. Figure 2 and Figure 3 As shown in FIG. 1 , the P heads of the two P-type water seals are both facing downward, and the protruding surfaces of the P heads of the two P-type water seals are arranged inclined toward the upstream direction; the upper water seal 4 is located above and in front of the lower water seal 5. When the upper water seal 4 is arranged on the door lintel 3, as shown in FIG. Figure 4 As shown, the P-head protruding surface of the upper water seal 4 is arranged to be inclined upward toward the downstream direction. At the same time, the top of the arc gate 1 adopts an inverted V-shaped closed structure with an upper rounded 12; the upstream side of the top of the arc gate 1 and the downstream side of the lintel 3 are both provided with inverted tooth-shaped anti-wave ribs 11; the inverted tooth-shaped anti-wave ribs 11 and the upper and lower water seals strengthen the top of the arc gate and prevent surges from entering from the top of the gate.

[0035] like Figure 1 to Figure 4 As shown, a group of water seal exhaust main pipes 6 and a group of water seal exhaust auxiliary pipes 7 are arranged in the water retaining breast wall 2; the water seal exhaust main pipe 6 is provided with two air inlets, one of which is located at the downstream end face of the door lintel 3 at the bottom of the lower water seal 5, and the other air inlet is located downward at the bottom face of the door lintel 3; the air inlet of the water seal exhaust auxiliary pipe 7 is located at the upper inclined face of the door lintel 3 between the upper water seal 4 and the lower water seal 5; the exhaust ports of the water seal exhaust main pipe 6 and the water seal exhaust auxiliary pipe 7 are both located at the back surface of the upper part of the breast wall 2. Side exhaust main pipes 9 and side exhaust auxiliary pipes 10 are arranged in the gate walls 8 on both sides of the arc gate; the air inlet of the side exhaust main pipe 9 is located at the end face of the gate wall 8 on the side close to the arc gate 1 below the lower water seal 5; the air inlet of the side exhaust auxiliary pipe 10 is located at the end face of the gate wall 8 on the side close to the arc gate 1 between the upper water seal 4 and the lower water seal 5; the exhaust ports of the side exhaust main pipe 9 and the side exhaust auxiliary pipe 10 are both located at the top face of the gate wall 8. When a surge occurs, the air bag explosion generated below the upper and lower water seals is led to the downstream end surface of the top of the water retaining breast wall 2 through the water seal exhaust main pipe 6 and the water seal exhaust auxiliary pipe 7 for release. At the same time, the air bag explosion generated between the upper and lower water seals is led to the top surface of the gate wall 8 for release through the side exhaust main pipe 9 and the side exhaust auxiliary pipe 10 to prevent the surge from damaging the upper and lower water seals.

[0036] The back surface of the arc gate 1 is provided with a four-main beam straight arm frame consisting of an upper main beam 13, a middle upper main beam 14, a middle lower main beam 15 and a lower main beam 16 arranged in a fan shape and hinged with a support hinge 17 to improve the overall rigidity and stability of the arc gate. The support hinge 17 is arranged according to the principle of the top-exposed arc working gate in the "Design Code for Steel Gates of Hydropower Engineering" (NB 35055). One end of the upper main beam 13, the middle upper main beam 14, the middle lower main beam 15 and the lower main beam 16 are all hinged to the support hinge 17, and the other end of the upper main beam 13 is connected to the downstream surface of the upper and lower seals of the arc gate 1 to enhance the stiffness of the top of the arc gate and improve the ability of the top of the arc gate 1 to resist surges and airbag impact loads; the other end of the middle lower main beam 15 is connected to the downstream surface of the arc gate 1 at the position of the water pressure action line of the arc gate 1 under normal water retaining conditions, and the center line of the middle lower main beam 15 is perpendicular to the bottom plate surface of the support hinge 17; the other end of the middle upper main beam 14 is supported at the middle position of the downstream surface of the arc gate 1 between the upper main beam 13 and the middle lower main beam 15, playing an overall strengthening role; the other end of the lower main beam 16 is connected to the downstream surface of the bottom water seal 18 of the arc gate 1 to prevent the bottom water seal 18 from deforming and leaking.

[0037] When designing the arc door 1, polar coordinates or rectangular coordinates can be used for design: Under normal working conditions, the water pressure between the intersection of the water seal support plate 19 and the arc door 1 panel and the arc door bottom sill 20 is considered. The upper main beam 13, the middle upper main beam 14, the middle lower main beam 15 and the lower main beam 16 are regarded as follows: Figure 5 The continuous support shown, the entire arc gate 1 is regarded as a continuous beam. The fulcrums A, B, C, D of the four continuous supports divide the continuous beam into S1, S2, S3, S4 and S5. S1 is the cantilever section between the junction of the lower water seal support plate 19 and the arc gate 1 panel to the top of the arc gate 1; S2, S3 and S4 correspond to the arc gate section between the upper main beam 13 and the middle upper main beam 14; the arc gate section between the middle upper main beam 14 and the middle lower main beam 15; the arc gate section between the middle lower main beam 15 and the lower main beam 16; S5 corresponds to the cantilever section between the lower main beam 16 and the arc gate sill 20.

[0038] The load distribution of the S1, S2, S3, S4 and S5 sections of the radial gate 1 under normal working conditions can be simplified as follows: Figure 6 The rectangular coordinate load model shown in the figure. The horizontal axis represents the arc length of each segment, and the vertical axis represents the load of each segment of the arc gate 1 under normal working conditions; the oblique line in the rectangular coordinate represents that the water pressure increases linearly with the increase of water depth.

[0039] When landslide water inrush occurs, Figure 7 As shown in the figure, the water inrush load on the arc gate = normal load on the arc gate + water inrush load on the arc gate. The water inrush load on the arc gate is considered as a uniform load with the water pressure difference between the water seal support plate 19 and the highest water level of the water inrush climbing, which can be equivalent to the following: Figure 8 The rectangular coordinate load model is shown in FIG. Through the above method, the complex mechanical shape of the space frame structure with four main beams and straight arms is transformed into a plane mechanical shape, which simplifies the design procedure and effectively improves the design efficiency.

Claims

1. A method for improving the surge resistance of a radial gate, characterized by: The method first transforms the gate into an exposed-top arc-shaped working gate with a water-retaining breast wall upstream. A lintel is provided at the bottom of the downstream side of the water-retaining breast wall to prevent gushing water from flowing through the gate top; at the same time, two top water seals, an upper water seal and a lower water seal, are provided at the contact surface between the top of the arc gate and the lintel to prevent gushing water from entering from the gate top; a water seal exhaust auxiliary pipe is provided on the lintel between the two top water seals to communicate with the air on the downstream surface of the top of the breast wall, and a water seal exhaust is provided on the lintel below the lower water seal. The main pipe is connected to the air on the downstream surface of the top of the breast wall. A side exhaust main pipe is arranged on the gate wall below the lower water seal to connect it to the air on the top surface of the gate wall. A side exhaust auxiliary pipe is arranged on the gate wall between the two top water seals to connect it to the air on the top surface of the gate wall. The air bag pressure formed by the surge flow is released through the vent pipe to reduce the damage of the surge flow to the top water seal. At the same time, inverted tooth-shaped anti-wave ribs are arranged on the lintel and the top of the arc gate. The inverted tooth-shaped anti-wave ribs are located on the upper side of the two top water seals to reduce the damage of the surge flow to the arc gate.

2. The method for improving the surge resistance of a radial gate according to claim 1, characterized in that: The two top water seals at the top of the arc door are both arranged at the top of the arc door, or the upper water seal is arranged on the door lintel, and the lower water seal is arranged at the top of the arc door.

3. The method for improving the surge resistance of a radial gate according to claim 1, characterized in that: The arc gate adopts a four-main-beam straight-arm frame structure to improve the overall rigidity and stability of the arc gate; the four-main-beam straight-arm frame includes an upper main beam, a middle-upper main beam, a middle-lower main beam and a lower main beam arranged in a fan shape; one end of the four main beams is hinged to the support hinge, and the other end of the upper main beam is connected to the downstream surface of the top water seal of the arc gate to enhance the rigidity of the top of the arc gate and improve the arc gate's ability to resist surges and airbag impact loads; the other end of the middle-lower main beam is connected to the downstream surface of the arc gate at the position of the water pressure action line of the arc gate under normal water retaining conditions, and the center line of the middle-lower main beam is perpendicular to the support hinge bottom plate surface; the other end of the middle-upper main beam is connected to the downstream surface of the arc gate at the middle position between the upper main beam and the middle-lower main beam to play an overall strengthening role; the other end of the lower main beam is connected to the downstream surface of the bottom water seal of the arc gate to prevent the bottom water seal from deforming and leaking.

4. The method for improving the surge resistance of a radial gate according to claim 3, characterized in that: The strength design of the four-main-beam straight-arm frame is carried out using a polar coordinate or rectangular coordinate model.

5. The method for improving the surge resistance of a radial gate according to claim 4, characterized in that: The polar coordinate model uses the origin of the polar coordinates to represent the fulcrum of the support hinge, and draws a group of rays starting from the origin as continuous arms according to the length and angle relationship of the upper main beam, the middle upper main beam, the middle lower main beam and the lower main beam, and then draws an arc line with an arc length corresponding to the arc length of the arc gate water retaining surface to represent the arc gate as a continuous beam, and the intersection of the arc line and the divergent end of each ray corresponds to the fulcrum position of the upper main beam, the middle upper main beam, the middle lower main beam and the lower main beam and the arc gate, and finally draws a gradient line with the origin as the center as the pressure line acting on the arc gate, thus completing the establishment of the polar coordinate model, and the shape of the polar coordinate model is a plane sector.

6. A structure for improving the surge resistance of a radial gate, which is formed according to any one of the methods for improving the surge resistance of a radial gate according to claims 1 to 5, comprising a radial gate (1); characterized in that: A water retaining breast wall (2) is provided on the upstream side of the top of the arc door (1), and a door lintel (3) is provided at the bottom of the downstream side of the water retaining breast wall (2); a group of water seal exhaust main pipes (6) and a group of water seal exhaust auxiliary pipes (7) are provided in the water retaining breast wall (2); the water seal exhaust main pipe (6) is provided with two air inlets, one of which is located on the downstream side of the door lintel (3) at the bottom of the lower water seal (5), and the other is located on the bottom surface of the door lintel (3); the air inlet of the water seal exhaust auxiliary pipe (7) is located on the upper inclined surface of the door lintel (3) between the upper water seal (4) and the lower water seal (5); the water seal exhaust main pipe (6) is provided with a plurality of ...). The exhaust ports of the water seal exhaust auxiliary pipe (7) are both located on the back surface of the upper part of the water retaining breast wall (2); side exhaust main pipes (9) and side exhaust auxiliary pipes (10) are both provided in the gate walls (8) on both sides of the arc gate (1); the air inlet of the side exhaust main pipe (9) is located on the end face of the gate wall (8) below the lower water seal (5) on the side close to the arc gate (1); the air inlet of the side exhaust auxiliary pipe (10) is located on the end face of the gate wall (8) between the upper water seal (4) and the lower water seal (5) on the side close to the arc gate (1); the exhaust ports of the side exhaust main pipe (9) and the side exhaust auxiliary pipe (10) are both located on the top surface of the gate wall (8).

7. The structure for improving the surge resistance of radial gates according to claim 6 is characterized in that: The top of the arc gate (1) adopts an inverted V-shaped closed structure with a chamfer (12); a group of inverted tooth-shaped wave-resistant ribs (11) are provided on the upstream side of the top of the arc gate (1) and the downstream side of the lintel (3).

8. The structure for improving the surge resistance of radial gates according to claim 6 is characterized in that: The back surface of the arc gate (1) is provided with a four-main crossbeam straight arm frame consisting of an upper main crossbeam (13), a middle upper main crossbeam (14), a middle lower main crossbeam (15) and a lower main crossbeam (16) arranged in a fan shape and hinged with a support hinge (17).

9. The structure for improving the surge resistance of radial gates according to claim 8, characterized in that: One end of the upper main crossbeam (13), the middle upper main crossbeam (14), the middle lower main crossbeam (15) and the lower main crossbeam (16) are all connected to the support hinge (17); the other end of the upper main crossbeam (13) is connected to the downstream surface of the upper and lower water seals of the arc gate (1); the other end of the middle lower main crossbeam (15) is connected to the downstream surface of the arc gate (1) at the water pressure action line of the arc gate (1) under normal water retaining working conditions; the center line of the middle lower main crossbeam (15) is perpendicular to the bottom plate of the support hinge (17); the other end of the middle upper main crossbeam (14) is connected to the downstream surface of the arc gate (1) at the middle position between the upper main crossbeam (13) and the middle lower main crossbeam (15); and the other end of the lower main crossbeam (16) is connected to the downstream surface of the bottom water seal (18) of the arc gate (1).

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