On-site disassembly and assembly construction method for side water seal of embedded overflow flood discharge radial gate of hydropower station

Abstract

The invention discloses a site disassembly and assembly construction method for a side water seal of an embedded overflow flood discharge radial gate of a hydropower station. The site disassembly and assembly construction method is carried out around disassembly and assembly of the side water seal of the embedded overflow flood discharge radial gate of the hydropower station. Before construction, relevant flood discharge facilities are stopped, an overhaul area is isolated, a suspended platform is built, a safety anti-falling system and an auxiliary lifting point are installed, and safety measures are strictly accepted and accepted; in construction, after a side water seal pressing plate and an old water seal are dismantled in a segmented mode and a base is cleaned, a new water seal is drilled and hoisted, the state of the new water seal is adjusted, the pressing plate is reinstalled, and it is ensured that bolts are evenly fastened; after installation is completed, the size and performance of the side water seal are checked, a light-transmitting test and switch debugging are conducted, and it is ensured that the gate runs stably; after construction is finished, the auxiliary lifting point, the anti-falling system and the suspended platform are sequentially dismantled, and the working face is cleaned; according to the method, safe and efficient disassembly and assembly of the side water seal are guaranteed by standardizing the process and safety protection measures, and normal operation of the radial gate is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of maintenance of flood discharge facilities of a hydropower station, in particular to an on-site disassembly and assembly construction method of a side water seal of an embedded overflow and flood discharge arc gate of a hydropower station. Background Art

[0002] In the flood discharge facilities of hydropower station dams, various flood discharge and water retaining facilities are layered on the dam body, mainly used to discharge flood water and retain water for energy storage. During the flood season, when the upstream water flow is large, they are used to discharge excess river water. During the dry season, when the upstream water flow is small, they are used to retain water for energy storage, thereby controlling the water level upstream of the reservoir at a reasonable and safe height to ensure the safe operation of the hydropower station project. In particular, the effective sealing of the seals of the radial gate-type flood discharge facilities of hydropower stations is related to the safe operation of the flood discharge facilities.

[0003] At present, conventional rubber water seals are generally used to seal and stop water between flood discharge facilities and hydraulic structures. For rubber products, there is a limit on the service life. In addition, long-term immersion in water will accelerate aging and lose its sealing performance. Therefore, regular replacement of seals of flood discharge facilities is very important. The replacement of water seals of the dam's embedded overflow flood discharge arc gate is even more difficult for maintenance personnel. The arc gate is blocked by hydraulic structures directly above, and the water seal replacement work cannot be carried out by direct external lifting, and personnel cannot reach it safely. Carrying out on-site disassembly and assembly of water seals in this complex environment is a problem that our maintenance personnel urgently need to solve.

[0004] Therefore, based on the actual operating conditions on site, research on how to efficiently, safely and economically complete the on-site disassembly and assembly process of the embedded overflow and flood discharge arc gate water seal of the hydropower station has a good reference role and great economic value for the on-site disassembly and assembly of the water seal of the flood discharge facilities of the same type of hydropower station. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a method for on-site disassembly and assembly of the side water seal of the embedded overflow and flood discharge arc gate of a hydropower station, which can shorten the construction period, reduce the workload of equipment disassembly and assembly and the difficulty of construction operation, reduce the safety risk of operation, and improve the quality of maintenance.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is: a method for on-site disassembly and assembly of the side water seal of the embedded overflow and flood discharge radial gate of a hydropower station, comprising the following steps: Step 1) The flood discharge facilities are shut down; Step 2) Isolate the safety inspection area; Step 3) Installation of suspended platform: A manned suspended platform is set up at the water seals on both sides of the dam overflow spillway to facilitate the passage of personnel for replacing the side water seals and for maintenance needs, ensuring the safety of maintenance personnel; Step 4) Installation of safety anti-fall system: Use independent suspended platform anti-fall device and operator anti-fall device to achieve dual protection for the suspended platform and passers-by, ensuring the safety of the suspended platform device and personnel during the passage; Step 5) Auxiliary lifting point installation: Since the radial gate water seal is in an arc shape and is inside the dam body, large lifting equipment cannot effectively reach the maintenance point. Therefore, corresponding auxiliary lifting point devices are installed on the top of the water seals on both sides of the dam to provide lifting assistance for the subsequent disassembly and installation of the water seal pressure plate and the new and old water seals; Step 6) Acceptance of safety measures; Step 7) Remove the side water seal pressure plate: Since the overflow spillway side water seal is long, the pressure plate is fixed with a segmented structure. The removal process adopts the method of removing the sections one by one from top to bottom on both sides simultaneously. During the removal process, an auxiliary lifting point device is used to cooperate with the lifting out of the tank; Step 8) Removal of the old side water seal: Remove the old water seal on the radial gate side water seal base, lift it to a certain height through the auxiliary lifting point device, cut it off and disassemble it at the appropriate position, and then lift it to the top of the dam to facilitate subsequent transportation; Step 9) Cleaning the side water seal base: clean the scale and rust on the water seal base to ensure that the water seal base is clean and does not affect the safe operation of the subsequent water seal due to debris; clean the base bolt holes to ensure that the subsequent pressure plate fastening bolts are well connected; Step 10) Drill holes for the new side water seal: drill holes in the installation direction of the side water seal pressure plate in the open area of the dam top to prepare for subsequent installation; Step 11) Hoisting of the new side water seal: Use the auxiliary lifting point device to hoist the new side water seal with the holes drilled into the radial gate water seal base, and tie it to the radial gate base intermittently to ensure that it will not fall off when the pressure plate is installed later; Step 12) Adjust the new side water seal: perform local tightening adjustment on the side water seal to prevent the side water seal from stretching too long due to its own weight, resulting in inconsistent compression after subsequent water seal installation; Step 13) Reinstall the side water seal pressure plate: Use the auxiliary lifting point device to lift the side water seal pressure plate to the installation location, connect it to the side water seal base with bolts, and tighten it several times with a torque wrench to ensure that the bolts are evenly stressed. Step 14), side water seal acceptance; Step 15), side water seal debugging; Step 16), remove the auxiliary lifting point device; Step 17) Remove the safety fall prevention system; Step 18) Dismantling of suspended platform: dismantle the suspended platform on the upstream side of the dam and clear the upstream working surface of the dam.

[0007] Preferably, in step 1), the flood discharge facilities that need to replace the water seal are taken out of operation, and the overflow flood discharge radial gates are lifted to the fully open position to facilitate the guidance to the water-facing surface of the overflow flood discharge radial gates during the subsequent erection of the suspended platform.

[0008] Preferably, the specific process of setting up a manned suspended platform at the water seal positions on both sides of the dam overflow spillway in step 3) is as follows: Step 3.1) Move the dam gantry crane to the location where the first suspended platform needs to be installed; Step 3.1.1) Install the first suspended platform base: Install the load-bearing beam of the suspended platform on the track, cantilever it to the overflow and spillway, and clamp it to the track with fixing parts; Step 3.1.2) Install the counterweight of the first suspended platform: Install the counterweight frame at the tail end of the load-bearing beam, and then use the dam gantry crane to hoist the counterweight block onto the counterweight frame to ensure that the platform base is safe and firm. Step 3.1.3) Install the first suspended platform access ladder: Lift the radial gate to its upper limit. Use the dam gantry crane to hoist the access ladder to the gap between the radial gate and the dam. Then, use the upstream arc surface of the radial gate to pull the access ladder downward until it is close to the load-bearing beam. Then, guide the access ladder onto the load-bearing beam and secure it. Step 3.2) Move the dam gantry crane to the location where the second suspended platform needs to be installed; Step 3.2.1) Install the second suspended platform base: Install the load-bearing beam of the suspended platform on the track, cantilever it to the overflow and spillway, and clamp it to the track with fixing parts; Step 3.2.2) Install the counterweight of the second suspended platform: Install the counterweight frame at the tail end of the load-bearing beam, and then use the dam gantry crane to lift the counterweight block onto the counterweight frame to ensure that the platform base is safe and firm. Step 3.2.3) Installation of the second suspended platform access ladder: lift the radial gate to the upper limit position, and use the dam gantry crane to lift the access ladder to the gap between the radial gate and the dam. Then, use the upstream arc surface of the radial gate to pull the access ladder down to a position close to the load-bearing beam, guide the access ladder onto the load-bearing beam, and then fix it.

[0009] Preferably, the specific process of using independent suspended platform anti-falling devices and operator anti-falling devices in step 4) to respectively achieve dual protection of the suspended platform and passers-by is as follows: Installation of anti-fall device for suspended platform: Use rail clamps and steel wire ropes to strengthen and fix the suspended platform. Fix the rail clamps on the track, connect one end of the steel wire rope to the rail clamp, and the other end to the bottom of the suspended platform to achieve effective protection of the suspended platform. Installation of anti-fall device for workers: anti-fall device for workers passing up and down is installed along the channel ladder frame of the suspended platform. The anti-fall device for workers includes anti-fall guide rails and brake sliders. The anti-fall guide rails are arranged along the channel ladder frame, and the brake slider is connected to the safety equipment of the climbers. This device can ensure the safety of personnel passing through the channel ladder frame and prevent the risk of personnel falling during the climbing process.

[0010] Preferably, the auxiliary lifting point device in step 5) includes a base, a counterweight system and a drive system are provided on the base, the base is rotatably connected to the bottom of the rotating arm, the rotating arm is provided with a guide wheel cooperating with the wire rope, one end of the wire rope is connected to the drive system, and the other end is connected to the lifting hook.

[0011] Preferably, the specific process of step 7) is as follows: work can only be carried out after the measures are accepted, the side water seal pressure plates are numbered before disassembly, and the gap between the pressure plates is measured, and then the pressure plates are removed; when the side water seal pressure plates are removed, two people cooperate with each other on the water seals on both sides of the radial gate, one person stands on the suspended platform, and the other person stands on the reserved platform part of the flow channel. The two people cooperate to operate the bolts and nuts before and after the radial gate leaves, and the water seal pressure plates are removed simultaneously on both sides, and the gates are lifted dynamically to cooperate with the removal of the side water seals.

[0012] Preferably, the disassembly principle of the water seal pressure plate and bolts should be followed from top to bottom. After the pressure plate bolts are unscrewed, anti-falling measures should be taken for the pressure plate, and the old water seal should be intermittently fixed on the radial gate with wire to prevent the side water seal from slipping. During disassembly, an auxiliary lifting point device should be used to cooperate with the lifting, and it should be placed in sequence on the dam top platform.

[0013] Preferably, the specific process of step 10) is as follows: Place the new side water seal flat on the dam in an open area on the top of the dam, place the pressure plates on the water seal in the order of installation direction, and control the on-site placement amount according to the pressure plate gap measured before to ensure that the water seal and the pressure plate effectively fit in the free state, and reserve a compression margin of about 3mm for positioning. Mark the installation holes of the pressure plate on the side water seal, and then use a hollow drill bit with a hole diameter 1.0mm smaller than the bolt to drill holes in preparation for subsequent installation.

[0014] Preferably, the specific process of step 13) is: lift the radial gate to the fully open position, and the overall installation principle is to install from bottom to top. Lift the side water seal pressure plate to the installation position through the auxiliary lifting point device. If the gap is small, you should first use a jack to push the radial gate out of the gap required for the installation of the new side water seal on one side, install and fix the first pressure plate at the bottom of the new side water seal on the radial gate panel, and adjust the water seal compression according to the technical specifications. Connect it to the side water seal base with bolts and tighten it several times with a torque wrench to ensure that the bolts are evenly stressed; then use the same method to install the first pressure plate on the other side of the bottom, and perform the door drop operation after the installation is completed. Subsequently, construction is carried out alternately on both sides, and the installation is gradually completed until the radial gate is closed to a position 1.5m from the ground sill, and then stop closing the door.

[0015] Preferably, the specific process of step 18) is: use the dam top gantry crane to lift and dismantle the suspended platforms erected on the upstream side of the dam one by one, and during the lifting and dismantling process, open the radial gate to cooperate with the dismantling work, ensure that the recessed channel ladder can be slowly raised out of the overflow and flood discharge hole under the guidance of the radial gate, and then remove the load-bearing beams, counterweight frames and counterweight block components of the dam top suspended platform, and then clean the upstream working surface of the dam.

[0016] Beneficial effects of the present invention: (1) The present invention has developed a method for on-site disassembly and assembly of the side water seal of the embedded overflow and flood discharge arc gate of a hydropower station. The method has a simple and convenient operation process, improves labor efficiency, and is low-cost; (2) The present invention has high practical performance and has great promotion and reference significance in the on-site disassembly and assembly of the side water seal of the overflow and flood discharge arc gate of the same type of power station, and has the value of being widely promoted in the hydropower industry.

[0017] (3) The present invention can shorten the construction period, reduce the workload of equipment disassembly and assembly and the difficulty of construction operations, reduce operational safety risks, and improve maintenance quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of the suspended platform installed on the dam; Figure 2 Schematic diagram of the structure installed for the suspended platform and safety fall prevention system; Figure 3 It is a structural diagram of the auxiliary lifting point device; Figure 4 This is a cross-sectional view of the overflow and flood discharge radial gate dam; Figure 5 for Figure 1 Cross-sectional view of the radial gate dam with overflow and flood discharge in area A; Figure 6 for Figure 1 An enlarged structural diagram of the area where the middle arc gate is located. DETAILED DESCRIPTION

[0019] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0020] like Figure 1-6 As shown, a method for disassembling and assembling the side water seal of an embedded overflow and flood discharge radial gate of a hydropower station on site includes the following steps: Step 1: Take flood discharge facilities out of operation: Take flood discharge facilities that require water seal replacement out of operation to ensure that they can be repaired; Step 2: Isolate the safety maintenance area: Set up safety isolation fences at the dam crest gantry crane platform and the radial gate entrance opening, and build temporary isolation fences at the open opening and adjacent areas to effectively protect the working areas within the maintenance area and ensure effective isolation between the maintenance area and the operating area. Set up signs and warning signs at the corresponding work sites; Step 3, installation of suspended platform 2: erect a manned suspended platform 2 at the water seals on both sides of the dam overflow spillway to facilitate the passage of personnel for replacing the side water seals and for maintenance needs, ensuring the safety of maintenance personnel; Step 4: Installation of safety anti-fall system: Use independent suspended platform anti-fall device 51 and operator anti-fall device 52 to achieve dual protection for suspended platform 2 and passers-by, ensuring the safety of suspended platform 2 device and personnel during the passage process; Step 5: Auxiliary lifting point installation: Since the radial gate water seal is in an arc shape and is inside the dam body, large lifting equipment cannot effectively reach the maintenance point. Therefore, corresponding auxiliary lifting point devices 3 are installed on the top of the water seals on both sides of the dam to provide lifting assistance for the subsequent disassembly and installation of the water seal pressure plate and the new and old water seals; Step 6: Safety measures acceptance: The above-mentioned personnel and equipment safety protection devices shall be inspected and accepted. They can be put into use only after passing the inspection; Step 7, side water seal pressure plate removal: Due to the long side water seal of the overflow spillway, the pressure plate is fixed with a segmented structure. The removal process adopts the method of removing the plates one by one from top to bottom on both sides simultaneously. During the removal process, the auxiliary lifting point device 3 is used to cooperate with the lifting out of the tank; Step 8, dismantling the old side water seal: remove the old water seal on the radial gate side water seal base, lift it to a certain height through the auxiliary lifting point device 3, cut it off and disassemble it at the appropriate position, and then hoist it to the top of the dam to facilitate subsequent transportation; Step 9. Clean the side water seal base: clean the scale and rust on the water seal base to ensure that the water seal base is clean and does not affect the safe operation of the subsequent water seal due to debris; clean the base bolt holes to ensure that the subsequent pressure plate fastening bolts are well connected; Step 10: Drill holes for the new side water seal: Drill holes in the installation direction of the side water seal pressure plate in the open area of the dam top to prepare for subsequent installation; Step 11: Hoisting the new side water seal: Use the auxiliary lifting point device 3 to hoist the new side water seal with the holes drilled into the radial gate water seal base, and tie it to the radial gate base intermittently to ensure that it will not fall off when the pressure plate is installed later; Step 12: Adjust the new side water seal: perform local tightening adjustment on the side water seal to prevent excessive stretching due to the side water seal's own weight, which may lead to inconsistent compression after subsequent water seal installation. Step 13: Reinstall the side water seal pressure plate: Use the auxiliary lifting point device 3 to lift the side water seal pressure plate to the installation location, connect it to the side water seal base with bolts, and tighten it several times with a torque wrench to ensure that the bolts are evenly stressed. Step 14, side water seal acceptance: Check the installation size and performance of the side water seal after installation. After the size and performance inspection are qualified, close the working radial gate and conduct a light transmission test on the side water seal. It can be put into use only after passing the test; Step 15, side water seal debugging: debug the side water seal to see if the compression of the water seals on both sides and the side rails are consistent during the full opening and closing of the radial gate, to ensure that the radial gate runs smoothly and at normal speed during the opening and closing process; Step 16, dismantling the auxiliary lifting point device 3: dismantling the auxiliary lifting point device 3 installed on the dam and placing it in the material placement position specified on the dam; Step 17: Removal of the safety anti-fall system: Remove the suspended platform anti-fall device 51 installed on the suspended platform 2 to ensure that the device is effectively separated from the suspended platform 2 to facilitate subsequent removal of the suspended platform 2; Step 18, dismantling the suspended platform 2: dismantle the suspended platform 2 built on the upstream side of the dam and clean up the upstream working surface of the dam.

[0021] In step 1, the flood discharge facility that needs to replace the water seal is shut down, and the overflow flood discharge arc gate 4 is lifted to the fully open position to facilitate the guidance to the water-facing surface of the overflow flood discharge arc gate 4 during the subsequent erection of the suspended platform 2.

[0022] In the step 2 of isolating the safety inspection area: a safety isolation fence is set up at the entrance of the dam EL.612m dam top gantry crane platform and the radial gate, and a temporary isolation fence is set up at the open opening and the edge to achieve effective protection of the working area in the inspection area, ensure effective isolation of the inspection area and the operating area, and set up signs and warning signs at the work site at the corresponding position.

[0023] In the step 3 of installing the suspended platform: a suspended platform 2 is set up at the water seals on both sides of the overflow and flood discharge radial gate at the platform position EL.612m of the dam to facilitate the passage of personnel replacing and repairing the side water seal 40, ensuring the safety of maintenance personnel. The specific setting method is as follows: Step 3.1, move the dam gantry crane 1 to the location where the first suspended platform 2 needs to be installed; Step 3.1.1. Install the base of the first suspended platform 2: Install the load-bearing beam 21 of the suspended platform 2 on the track 03, cantilever it to the overflow spillway 01, and clamp it to the track 03 with fixing parts; Step 3.1.2, counterweight installation of the first suspended platform 2: Install the counterweight frame 22 at the tail end of the load-bearing beam 21, and then use the reloading crane 10 of the dam gantry crane 1 to hoist the counterweight block 23 onto the counterweight frame 22 to ensure that the platform base is safe and firm; Step 3.1.3, installation of the channel ladder frame on the first suspended platform 2: lift the radial gate 3 to the upper limit position, and use the reloading crane 10 of the dam gantry crane 1 to lift the channel ladder frame 24 to the gap between the radial gate 4 and the dam 0, and then use the upstream arc surface of the radial gate 3 to pull the channel ladder frame 24 down to a position close to the load-bearing beam 21, and then guide the channel ladder frame 24 onto the load-bearing beam 21 and then fix it; in this embodiment, the channel ladder frame 24 is an internal hollow arc column frame structure, and its curvature is consistent with the curvature of the water-facing surface of the radial gate 4, which can ensure that the radial gate 4 does not interfere with it during the moving process.

[0024] Step 3.2, move the dam gantry crane 1 to the location where the second suspended platform 2 needs to be installed; Step 3.2.1, Install the base of the second suspended platform 2: Install the load-bearing beam 21 of the suspended platform 2 on the track 03, cantilever it to the overflow spillway 01, and clamp it to the track 03 with fixing parts; Step 3.2.2, counterweight installation of the second suspended platform 2: Install the counterweight frame 22 at the tail end of the load-bearing beam 21, and then use the reloading crane 10 of the dam gantry crane 1 to hoist the counterweight block 23 onto the counterweight frame 22 to ensure that the platform base is safe and firm; Step 3.2.3, installation of the channel ladder frame of the second suspended platform 2: lift the radial gate 3 to the upper limit position, and use the reinstallation crane 10 of the dam gantry crane 1 to lift the channel ladder frame 24 to the gap between the radial gate 4 and the dam 0, and then use the upstream arc surface of the radial gate 3 to pull the channel ladder frame 24 downward to a position close to the load-bearing beam 21, guide the channel ladder frame 24 onto the load-bearing beam 21, and then fix it.

[0025] In step 4, independent suspended platform anti-falling devices 51 and operator anti-falling devices 52 are used to achieve dual protection for the suspended platform 2 and the passers-by, ensuring the safety of the suspended platform device and the passers-by during the process. The specific method is as follows: Installation of the suspended platform anti-fall device 51: Use a rail clamp 511 and a steel wire rope 512 to strengthen and fix the suspended platform 2. Fix the rail clamp 511 on the track 03. One end of the steel wire rope 512 is connected to the rail clamp 511, and the other end is connected to the bottom of the suspended platform 2 to achieve effective protection of the suspended platform 2. Installation of the worker anti-fall device 52: An anti-fall device 52 for workers to go up and down is arranged along the channel ladder frame 24 of the suspended platform 2. The worker anti-fall device 52 includes an anti-fall guide rail 521 and a brake slider. The anti-fall guide rail 521 is arranged along the channel ladder frame 24, and the brake slider is connected to the climbing worker safety equipment. The device can ensure the safety of workers passing through the channel ladder frame 24 and prevent the risk of workers falling into the air during the climbing process.

[0026] In step 5, since the side water seal 40 of the radial gate 4 is in an arc shape and is inside the overflow and flood discharge hole 01 of the dam body, large-scale lifting equipment cannot effectively reach the maintenance point. It is necessary to set corresponding auxiliary lifting point devices 3 at the top positions of the two side water seals 40 to provide lifting assistance for the subsequent disassembly and assembly of the side water seal pressure plates and the new and old water seals; the auxiliary lifting point device 3 includes a base 31, on which a counterweight system 32 and a drive system 33 are provided. The base 31 is rotatably connected to the bottom of the rotating arm 34, and the rotating arm 34 is provided with a guide wheel that cooperates with the wire rope 35. One end of the wire rope 35 is connected to the drive system 33, and the other end is connected to the lifting hook. The entire device is fixedly installed on the concrete dam. The rotating arm 34 can lift the materials inside the orifice out of the orifice position and then rotate them to be placed on the top of the dam, which is convenient for maintenance personnel to safely transport them.

[0027] In the safety measures acceptance step 6, the main acceptance steps (1), (2), (3), (4), and (5) are to check whether the status of the measures specified in the steps meet the requirements, whether the safety measures set up meet the standards and specifications, and whether the above measures need to be stopped for acceptance. Only after the acceptance is qualified can the subsequent work be carried out.

[0028] The specific process of step 7 is as follows: work can only be carried out after the measures are accepted. Before disassembling, the side water seal pressure plates 40-1 are numbered and the gaps between the pressure plates are measured before the pressure plates are removed. When removing the side water seal pressure plates 40-1, two people on each side of the radial gate 4 cooperate with each other. One person stands on the suspended platform 2, and the other stands on the reserved platform of the flow channel. The two people, one in front and one behind, cooperate to operate the bolts 40-2 and nuts 40-3 on the front and rear doors of the radial gate 4. The water seal pressure plates on both sides are removed simultaneously, and the gates are lifted dynamically to cooperate with the removal of the side water seals. The principle of disassembly of the water seal pressure plate and bolts should be carried out from top to bottom. After the pressure plate bolts are unscrewed, measures should be taken to prevent the pressure plate from falling, and the old water seal should be intermittently fixed on the radial gate with wire to prevent the side water seal from slipping. During disassembly, the auxiliary lifting point device 3 should be used for lifting, and it should be placed on the dam top platform in sequence.

[0029] In the step 8 of removing the old side water seal: remove the old water seal on the side water seal base of the radial gate 4. Pay attention to the risk of the whole body slipping during the removal process. After lifting to a certain height through the auxiliary lifting point 3, add a lifting point at the appropriate position of the water seal to ensure that the side water seal is hoisted as a whole to the top of the dam to facilitate subsequent transportation.

[0030] The specific process of step 10 is as follows: Place the new side water seal 40 flat on the dam in an open area on the top of the dam, place the pressure plates on the water seal in the order of installation direction, and control the on-site placement amount according to the pressure plate gap measured before, to ensure that the water seal and the pressure plate effectively fit together in a free state, and reserve a compression margin of about 3mm for positioning, mark the installation holes of the pressure plate on the side water seal, and then use a hollow drill bit with a hole diameter 1.0mm smaller than the bolt to drill holes in preparation for subsequent installation.

[0031] The specific process of step 13 is as follows: lift the radial gate to the fully open position. The overall installation principle is to install from bottom to top. Lift the side water seal pressure plate 40-1 to the installation position through the auxiliary lifting point device 3. If the gap is small, you should first use a jack to push the radial gate 4 out of the gap required for the installation of the new side water seal 40 on one side, and fix the first pressure plate at the bottom of the new side water seal 40 on the radial gate 4 panel, and adjust the water seal compression amount according to the technical specifications. Connect it to the side water seal base with bolts and tighten it several times with a torque wrench to ensure that the bolts are evenly stressed; then use the same method to install the first pressure plate on the other side of the bottom, and perform the door drop operation after the installation is completed. Subsequently, the two sides are alternately constructed and gradually installed until the radial gate 4 is closed to a position 1.5m from the ground sill, and then stop closing the door.

[0032] In the step 14 of side water seal acceptance, the installation dimensions and performance of the side water seal after installation are checked (see Table 1 for details). After the dimensions and performance are qualified, the working radial gate is fully closed and the side water seal is subjected to a light transmission test. The side water seal can be put into use only after the test is qualified.

[0033] Table 1 Radial gate side water seal installation performance quality standards

[0034] In the step 16 of removing the auxiliary lifting point device, the two auxiliary lifting point devices 3 installed on the dam are removed and placed at the material placement position specified on the dam.

[0035] In the step 17 of removing the safety anti-fall system, the safety anti-fall devices (suspended platform anti-fall device 51 and operator anti-fall device 52) installed on the suspended platform 2 are removed to ensure that the devices are effectively separated from the suspended platform to facilitate subsequent removal of the suspended platform.

[0036] The specific process of step 18 is as follows: using the dam top gantry crane 1 to lift and remove the suspended platforms 2 built on the upstream side of the dam one by one. During the lifting and removal process, the radial gates 4 are opened to facilitate the removal work. The recessed access ladder 24 is ensured to be slowly lifted out of the overflow spillway 01 under the guidance of the radial gates 4. The load-bearing crossbeam 21, counterweight frame 22, and counterweight block 23 components of the suspended platforms 2 on the dam top are then removed, and the upstream working surface of the dam is then cleared. In the figure, 02 is the overflow spillway.

[0037] The above embodiments are merely preferred technical solutions of the present invention and should not be construed as limiting the present invention. The scope of protection of the present invention shall be the technical solutions set forth in the claims, including equivalent alternatives to the technical features of the technical solutions set forth in the claims. In other words, equivalent alternatives and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A method for on-site disassembly and assembly of the side water seal of an embedded overflow and flood discharge radial gate of a hydropower station, characterized by: The following steps are involved: Step 1) The flood discharge facilities are shut down; Step 2) Isolate the safety inspection area; Step 3) Installation of suspended platform (2): A manned suspended platform (2) is set up at the water seals on both sides of the dam overflow spillway to facilitate the passage of personnel for replacing the side water seals and for maintenance needs, ensuring the safety of maintenance personnel; Step 4) Installation of safety anti-fall system: using independent suspended platform anti-fall device (51) and operator anti-fall device (52) to achieve dual protection of suspended platform (2) and passers-by, ensuring the safety of suspended platform (2) device and personnel during the passage process; Step 5) Installation of auxiliary lifting points: Since the radial gate water seal is in an arc shape and is located inside the dam body, large lifting equipment cannot effectively reach the maintenance point. Therefore, corresponding auxiliary lifting point devices (3) are installed on the top of the water seals on both sides of the dam to provide lifting assistance for the subsequent disassembly and assembly of the water seal pressure plate and the new and old water seals; Step 6) Acceptance of safety measures; Step 7) Removal of the side water seal pressure plate: Since the overflow spillway side water seal is long, the pressure plate is fixed with a segmented structure. The removal process adopts the method of removing the plates one by one from top to bottom on both sides simultaneously. During the removal process, the auxiliary lifting point device (3) is used to assist in lifting the plates out of the tank. Step 8) Removal of the old side water seal: Remove the old water seal on the radial gate side water seal base, lift it to a certain height through the auxiliary lifting point device (3), cut it off and disassemble it at a suitable position, and then lift it to the top of the dam to facilitate subsequent transportation; Step 9) Cleaning the side water seal base: clean the scale and rust on the water seal base to ensure that the water seal base is clean and does not affect the safe operation of the subsequent water seal due to debris; clean the base bolt holes to ensure that the subsequent pressure plate fastening bolts are well connected; Step 10) Drill holes for the new side water seal: drill holes in the installation direction of the side water seal pressure plate in the open area of the dam top to prepare for subsequent installation; Step 11), hoisting of the new side water seal: hoist the new side water seal with the holes drilled into the radial gate water seal base using the auxiliary hoisting point device (3), and tie it to the radial gate base intermittently to ensure that it will not fall off when the pressure plate is installed later; Step 12) Adjust the new side water seal: perform local tightening adjustment on the side water seal to prevent the side water seal from stretching too long due to its own weight, resulting in inconsistent compression after subsequent water seal installation; Step 13), reinstall the side water seal pressure plate: lift the side water seal pressure plate to the installation location through the auxiliary lifting point device (3), connect it to the side water seal base through bolts, and tighten it several times with a torque wrench to ensure that the bolts are evenly stressed; Step 14), side water seal acceptance; Step 15), side water seal debugging; Step 16), the auxiliary lifting point device (3) is removed; Step 17) Remove the safety fall prevention system; Step 18), dismantling of the suspended platform (2): dismantling the suspended platform (2) built on the upstream side of the dam and clearing the upstream working surface of the dam.

2. The on-site disassembly and assembly method for the side water seal of the embedded overflow and flood discharge radial gate of a hydropower station according to claim 1 is characterized by: In the step 1), the flood discharge facility that needs to replace the water seal is shut down, and the overflow flood discharge arc gate (4) is lifted to the fully open position to facilitate the subsequent guidance of the suspended platform (2) during the erection process to the water-facing surface of the overflow flood discharge arc gate (4).

3. The on-site disassembly and assembly method for the side water seal of the embedded overflow and flood discharge radial gate of a hydropower station according to claim 1 is characterized by: The specific process of setting up a manned suspended platform (2) at the water seal positions on both sides of the dam overflow spillway in step 3) is as follows: Step 3.1), move the dam gantry crane (1) to the location where the first suspended platform (2) needs to be installed; Step 3.1.1) Installation of the base of the first suspended platform (2): Install the load-bearing beam (21) of the suspended platform (2) on the track (03), cantilever it to the overflow spillway (01), and clamp it to the track (03) through the fixing parts; Step 3.1.2) Installation of the counterweight of the first suspended platform (2): Install the counterweight frame (22) at the tail end of the load-bearing beam (21), and then hoist the counterweight block (23) onto the counterweight frame (22) through the reloading crane (10) of the dam gantry crane (1), ensuring that the platform base is safe and firm; Step 3.1.3), installation of the channel ladder frame of the first suspended platform (2): lift the radial gate (3) to the upper limit position, and hoist the channel ladder frame (24) to the gap between the radial gate (4) and the dam (0) through the reloading crane (10) of the dam gantry crane (1), and then pull the channel ladder frame (24) through the upstream arc surface of the radial gate (3) to slide it downward to a position close to the load-bearing beam (21), and then guide the channel ladder frame (24) onto the load-bearing beam (21) and fix it; Step 3.2), move the dam gantry crane (1) to the location where the second suspended platform (2) needs to be installed; Step 3.2.1) Installation of the base of the second suspended platform (2): Install the load-bearing beam (21) of the suspended platform (2) on the track (03), cantilever it to the overflow spillway (01), and clamp it to the track (03) through the fixing parts; Step 3.2.2) Installation of counterweight for the second suspended platform (2): Install the counterweight frame (22) at the tail end of the load-bearing beam (21), and then hoist the counterweight block (23) onto the counterweight frame (22) through the reloading crane (10) of the dam gantry crane (1), ensuring that the platform base is safe and firm; Step 3.2.3), installation of the second suspended platform (2) channel ladder: lift the radial gate (3) to the upper limit position, and hoist the channel ladder (24) to the gap between the radial gate (4) and the dam (0) through the reloading crane (10) of the dam gantry crane (1), and then pull the channel ladder (24) through the upstream arc surface of the radial gate (3) to slide it downward to a position close to the load-bearing beam (21), guide the channel ladder (24) onto the load-bearing beam (21), and then fix it.

4. The on-site disassembly and assembly method for the side water seal of the embedded overflow and flood discharge radial gate of a hydropower station according to claim 1 is characterized by: The specific process of using the independent suspended platform anti-falling device (51) and the operator anti-falling device (52) in step 4) to respectively realize the dual protection of the suspended platform (2) and the passers-by is as follows: Installation of the suspended platform anti-fall device (51): The suspended platform (2) is reinforced and fixed by using a rail clamp (511) and a steel wire rope (512), the rail clamp (511) is fixed on the track (03), one end of the steel wire rope (512) is connected to the rail clamp (511), and the other end is connected to the bottom of the suspended platform (2), thereby achieving effective protection of the suspended platform (2); Installation of the worker anti-fall device (52): The worker anti-fall device (52) is arranged along the passage ladder frame (24) of the suspended platform (2) for workers to go up and down. The worker anti-fall device (52) includes an anti-fall guide rail (521) and a brake slider. The anti-fall guide rail (521) is arranged along the passage ladder frame (24). The brake slider is connected to the climbing worker safety equipment. The device can ensure the safety of workers passing through the passage ladder frame (24) and prevent the risk of workers stepping on air and falling during the climbing process.

5. The on-site disassembly and assembly method for the side water seal of the embedded overflow and flood discharge radial gate of a hydropower station according to claim 1 is characterized by: The auxiliary lifting point device (3) in step 5) includes a base (31), a counterweight system (32) and a drive system (33) are provided on the base (31), the base (31) is rotatably connected to the bottom of a rotating arm (34), the rotating arm (34) is provided with a guide wheel that cooperates with a wire rope (35), one end of the wire rope (35) is connected to the drive system (33), and the other end is connected to a lifting hook.

6. The on-site disassembly and assembly method for the side water seal of the embedded overflow and flood discharge radial gate of a hydropower station according to claim 1 is characterized by: The specific process of step 7) is as follows: the work can be carried out only after the measures are accepted. Before the side water seal pressure plates (40-1) are disassembled, they are numbered and the gaps between the pressure plates are measured, and then the pressure plates are removed. When the side water seal pressure plates (40-1) are removed, two people on each side of the radial gate (4) cooperate with each other, one standing on the suspended platform (2) and the other standing on the reserved platform of the flow channel. The two people cooperate with each other to operate the bolts (40-2) and nuts (40-3) on the front and rear of the door leaf of the radial gate (4), and the water seal pressure plates are removed simultaneously on both sides, and the door is lifted dynamically to cooperate with the removal of the side water seal.

7. The on-site disassembly and assembly method for the side water seal of the embedded overflow and flood discharge radial gate of a hydropower station according to claim 6 is characterized by: The principle of disassembling the water seal pressure plate and bolts is to proceed from top to bottom. After the pressure plate bolts are unscrewed, measures should be taken to prevent the pressure plate from falling, and the old water seal should be fixed to the radial gate intermittently with wire to prevent the side water seal from sliding. During disassembly, the auxiliary lifting point device (3) should be used to assist in lifting, and the water seals should be placed on the dam top platform in order.

8. The on-site disassembly and assembly method for the side water seal of the embedded overflow and flood discharge radial gate of a hydropower station according to claim 1 is characterized by: The specific process of step 10) is as follows: Place the new side water seal (40) flat on the dam in an open area on the dam top, place the pressure plate on the water seal in the order of the installation direction, and control the on-site placement amount according to the previously measured pressure plate gap to ensure that the water seal and the pressure plate are effectively fitted in a free state, and reserve a compression margin of about 3mm for positioning. Mark the installation hole of the pressure plate on the side water seal, and then use a hollow drill bit with a hole diameter 1.0mm smaller than the bolt to drill holes in preparation for subsequent installation.

9. The on-site disassembly and assembly method for the side water seal of the embedded overflow and flood discharge radial gate of a hydropower station according to claim 1 is characterized by: The specific process of step 13) is as follows: lift the radial gate to the fully open position. The overall installation principle is to install from bottom to top. Lift the side water seal pressure plate (40-1) to the installation position through the auxiliary lifting point device (3). If the gap is small, the jack should be used first to push the radial gate (4) out of the gap required for the installation of the new side water seal (40) on one side. The first pressure plate at the bottom of the new side water seal (40) is fixed on the radial gate (4) panel, and the water seal compression is adjusted according to the technical specifications. Connect it to the side water seal base through bolts and tighten it several times with a torque wrench to ensure that the bolts are evenly stressed. Then use the same method to install the first pressure plate on the other side of the bottom. After the installation is completed, the door is lowered. The subsequent construction is carried out alternately on both sides. After the radial gate (4) is closed to a position of 1.5m from the ground sill, the door is stopped.

10. The on-site disassembly and assembly method for the side water seal of the embedded overflow and flood discharge radial gate of a hydropower station according to claim 1, characterized in that: The specific process of step 18) is as follows: using the dam top gantry crane (1) to lift and remove the suspended platforms (2) built on the upstream surface of the dam one by one, and during the lifting and removal process, the radial gate (4) is opened to cooperate with the removal work, ensuring that the recessed channel ladder (24) can be slowly raised out of the overflow and flood discharge hole (01) under the guidance of the radial gate (4), and then removing the load-bearing beams (21), counterweight frames (22) and counterweight blocks (23) of the dam top suspended platform (2), and then cleaning the upstream working surface of the dam.

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