阅读说明：本技术 高水头电站进水口事故快速闸门大型油缸现场拆装方法 (Method for rapidly disassembling large oil cylinder of gate in water inlet accident of high-water-head power station on site ) 是由 包唐伟 刘文忠 董万里 刘文亮 代飞 毛延翩 席前伟 侯春尧 于 2021-06-24 设计创作，主要内容包括：一种高水头电站进水口事故快速闸门大型油缸现场拆装方法,将油缸从闸门孔口吊出,在坝面实现翻身放平,采用安全、高效、节约性的完成事故快速闸门大型油缸的拆装工艺,克服高水头电站拆装大型油缸检修工期长、工作量大、操作难度和安全风险高,其有益效果主要体现在：将油缸缸旁的有杆腔供油油管更换为带球阀的高压软管,方便后续对油缸活塞杆的控制及油缸吊装穿越油缸支撑架中心孔；在起吊前后,吊头退轴和固定,确保油缸安全起吊,在起吊过程中油缸活塞杆不会由于自重下滑,提高安全性；采用翻身工装与油缸上端面和吊耳连接,配合门机和汽吊实现翻身；采用将闸门快闭至全关位,在油缸有杆腔内的油液最少时,更换油管。(The utility model provides a large-scale hydro-cylinder on-spot dismouting method of high water head power station water inlet accident quick gate, hangs out the hydro-cylinder from the gate drill way, realizes standing up at the dam face and puts level, adopts safe, high-efficient, the dismouting technology of the large-scale hydro-cylinder of completion accident quick gate of economical, overcomes the large-scale hydro-cylinder of high water head power station dismouting and overhauls that the time limit is long, work load is big, the operation degree of difficulty and safe risk are high, its beneficial effect mainly appears: a rod cavity oil supply pipe beside the oil cylinder is replaced by a high-pressure hose with a ball valve, so that the subsequent control on an oil cylinder piston rod and the subsequent oil cylinder hoisting pass through a central hole of an oil cylinder support frame; before and after hoisting, the hoisting head is retreated from the shaft and fixed, so that the safety hoisting of the oil cylinder is ensured, the piston rod of the oil cylinder cannot slide down due to dead weight in the hoisting process, and the safety is improved; a turnover tool is connected with the upper end surface of the oil cylinder and the lifting lug and matched with a gantry crane and a steam crane to realize turnover; the gate is quickly closed to a fully closed position, and when oil in a rod cavity of the oil cylinder is minimum, the oil pipe is replaced.)

1. A method for quickly disassembling and assembling large oil cylinders of a gate in case of water inlet accidents in a high-water-head power station is characterized by comprising the following steps:

step 1, installing protection, namely building a safety isolation fence at the position of a pump room orifice of a hoist and at the position of an accident rapid gate orifice; installing a guardrail and anti-falling equipment at a manhole opening passing up and down in the door slot;

step 2, erecting a platform, namely erecting a full-lap maintenance platform (7) on a maintenance platform (7) at the head hanging part of the oil cylinder (6);

step 3, cleaning the channel, and removing an orifice bearing cover plate of a pump room, a canopy at an orifice part in the pump room and a gate orifice cover plate (5) in the pump room of a water inlet dam surface in the lifting channel of the oil cylinder (6);

step 4, replacing the oil pipe, replacing a rod cavity oil supply pipe beside the cylinder of the oil cylinder (6), wherein the replaced oil supply pipe is a high-pressure hose with a ball valve;

step 5, withdrawing the hanging head, namely withdrawing the connecting shaft of the hanging head (64) of the piston rod of the oil cylinder and the pull rod (9) of the gate, so that the oil cylinder (6) and the connected emergency gate (10) are effectively separated;

step 6, fixing the hanging head, fixing the retracted hanging head at a fully retracted position, and additionally adding a hard fixing part to reinforce and lock the hanging head;

step 7, dismantling the pipelines, and dismantling all the pipelines connecting the oil cylinder (6) and the hydraulic system;

step 8, tool installation, namely installing a temporary hoisting and turning tool on the upper end surface of the oil cylinder (6); the turnover tool structure comprises two lug plates arranged at the upper part of a flange plate, and a pin shaft penetrates through the lug plates to be connected with a lifting lug (2);

step 9, hoisting the oil cylinder (6) by adopting a water inlet dam surface gantry crane (1), connecting the hoisting lug (2) of the gantry crane (1) through an installed turning tool, keeping the hoisting lug (2) of the gantry crane (1) and the oil cylinder (6) in a vertical state, hoisting the hoisting lug out of a gate orifice and placing the hoisting lug in a slewing radius of a truck crane;

step 10, turning over and leveling, namely, turning over and leveling an oil cylinder (6) by adopting a truck crane matched with a gantry crane (1), leveling the oil cylinder, placing the oil cylinder at a non-hole position, padding battens below the oil cylinder during placement, adjusting the position of the oil cylinder (6) with a rod cavity oil through hole to enable the oil cylinder to be positioned right below the oil cylinder, preparing for subsequent oil discharge, and simultaneously making measures for preventing the oil cylinder (6) from rolling;

step 11, discharging oil from the oil cylinder, emptying oil in a rod cavity of the oil cylinder (6) through a control ball valve of an externally-connected high-pressure hose, removing the externally-connected high-pressure hose after emptying, installing a zero-hour blocking plate, and performing sealing measures;

step 12, loading and returning to a factory, after hydraulic oil in the oil cylinder (6) is emptied, hoisting the hydraulic oil to a transported trailer by using the cooperation of the gantry crane (1) and the truck crane, and firmly binding the hydraulic oil to a truck body;

step 13, the oil cylinder is installed again, and after the oil cylinder (6) is transported back to the site, the oil cylinder (6) is hoisted to a working position according to the reverse sequence of the step 4 to the step 11 and is connected with a corresponding pipeline;

step 14, performing joint adjustment of the oil cylinders, and performing a full-stroke exhaust test and a system pressure test on the oil cylinders (6) after the oil cylinders (6) are installed;

and step 15, dismantling the protection, and after all the work is finished, dismantling the safety protection set up in the early stage and recovering to the state before the work.

2. The method for on-site dismounting and mounting the large-scale oil cylinder of the high-head power station water inlet accident rapid gate according to claim 1, is characterized in that:

in the step 4, the gate is quickly closed to a full-closed position, and at the moment, a piston (61) in the oil cylinder (6) is attached to an oil cylinder lower end cover (62); and (3) closing an oil valve of an oil cylinder rod cavity oil supply pipe (43) in the pump room, loosening the rod cavity oil supply pipe and an oil cylinder connecting flange beside the oil cylinder, discharging oil in the pipeline, loosening an oil pipe clamp beside the cylinder, removing the rod cavity oil supply pipe (43) beside the cylinder, and connecting the rod cavity oil supply pipe and an oil cylinder lower cavity oil supply hole in the pump room by using a high-pressure hose with a valve.

3. The method for on-site dismounting and mounting the large-scale oil cylinder of the high-head power station water inlet accident rapid gate according to claim 1, is characterized in that:

in the step 5, the connecting shaft of the oil cylinder piston rod hanging head (64) and the gate pull rod (9) retreats, and the specific method is that the replaced high-pressure oil pipe is connected with a hydraulic system, so that the oil cylinder piston rod (63) is controlled, the gate pull rod (9) is lifted to the EL.589m platform (7) to be locked, then the connecting shaft of the oil cylinder piston rod hanging head (64) and the gate pull rod (9) is detached, and the oil cylinder (6) and the field accident gate (10) are ensured to be separated.

4. The method for on-site dismounting and mounting the large-scale oil cylinder of the high-head power station water inlet accident rapid gate according to claim 1, is characterized in that:

in the step 6, the oil cylinder piston rod (63) is controlled through the communicated high-pressure hose system, the oil cylinder piston rod (63) is retracted to zero stroke, a ball valve externally connected with a high-pressure hose is closed, and an oil cylinder piston rod hanging head (64) is fixed through a steel wire rope or a hanging strip.

5. The method for on-site dismounting and mounting the large-scale oil cylinder of the high-head power station water inlet accident rapid gate according to claim 1, is characterized in that:

in step 7, completely closing an oil cylinder rodless cavity oil supply ball valve, a rod cavity oil supply ball valve and an oil cylinder rodless cavity oil supplement ball valve in the pump room, removing a rodless cavity oil supply pipe (41) and an oil supplement pipe (42) which are connected with the oil cylinder in the pump room, removing the connection between the hose and an oil supply pipeline of the rod cavity in the pump room, hanging the high-pressure hose on a lower end cover of the oil cylinder through a steel wire rope, and taking the hose out of a gate orifice when the oil cylinder is hoisted in the later period.

6. The method for on-site dismounting and mounting the large-scale oil cylinder of the high-head power station water inlet accident rapid gate according to claim 1, is characterized in that:

in step 8, the method is to dismantle the oil cylinder openness instrument (44), and install a lifting appliance through the center hole of the openness instrument to dismantle the upper end cover of the oil cylinder; and connecting the flange of the turnover tool with the upper end part of the oil cylinder.

7. The method for on-site dismounting and mounting the large-scale oil cylinder of the high-head power station water inlet accident rapid gate according to claim 1, is characterized in that:

in the step 9, the oil cylinder is hoisted by using a portal crane at the water inlet dam surface, the portal crane is connected with a portal crane lifting lug (2) through a flange plate of the installed turnover tool, the portal crane lifting lug (2) and the oil cylinder (6) are kept in a vertical state, the portal crane lifting lug and the oil cylinder are hoisted out of the opening of the pump room, the lowest point of the bottom of the oil cylinder is higher than the dam surface by about 0.5 meter or more, and then the portal crane is stably moved to an open position and is positioned in the turning radius of the truck crane.

8. The method for on-site dismounting and mounting the large-scale oil cylinder of the high-head power station water inlet accident rapid gate according to claim 1, is characterized in that:

in step 11, a zero-time transfer pool required by oil discharge is set before oil discharge, oil in the oil cylinder is controlled by an external high-pressure hose to control a ball valve of the oil cylinder to prevent the oil from being emptied into the transfer pool, and then the oil cylinder is pumped into a special oil drum through an oil pumping trolley and then is subjected to centralized processing.

9. The method for on-site dismounting and mounting the large-scale oil cylinder of the high-head power station water inlet accident rapid gate according to claim 1, is characterized in that:

in step 14, after the oil cylinder is installed, performing a three-time full-stroke exhaust test on the oil cylinder, specifically, in the door opening process, externally connecting a pressure measuring hose at the top of an oil cylinder opening instrument for discharging air in a rodless cavity of the oil cylinder, and discharging gas in a rod cavity of the oil cylinder out of the oil tank after flowing back to the oil tank along with hydraulic oil through a door to realize effective exhaust of the interior of the oil cylinder; the system pressure test and setting mainly debugs various pressure relays of a hydraulic system and an oil cylinder, ensures that the pressure relays transmit correct signals, realizes effective protection of the hydraulic system, and ensures that the oil cylinder runs stably without vibration and the hydraulic system runs normally.

Technical Field

The invention belongs to the technical field of hydropower station gate dismounting and mounting, and relates to a method for quickly dismounting and mounting a large oil cylinder of a gate in a high-water-head power station water inlet accident on site.

Background

The high-water-head power station is provided with a water inlet accident rapid gate at a water intake of a water diversion power generation system, when a hydroelectric generating set generates an runaway accident and a diversion pipe rupture accident, the water flow is rapidly closed and cut off, and a power station set or a diversion steel pipe is protected, so that the safe operation of power station plants and equipment is guaranteed; in order to ensure that the emergency quick gate can be closed quickly in a short time, a hydraulic hoist structure is generally adopted for controlling the opening and the closing, so that the safe and stable operation of the emergency quick gate is directly related to the safety and the benefit of a power plant and a power station.

For example, the quick gate for water inlet accidents of the Xiluodi power station takes over from 2013 to the present, the quick gate operates for 8 years, partial metal structures and accessories reach the overhaul period of equipment, in addition, an oil cylinder of a hydraulic hoist is soaked in water all the year round, partial anticorrosive coatings possibly fall off, and meanwhile, the service life of rubber sealing elements of the oil cylinder and the accessories is generally not more than 8 years; therefore, the problem that power station maintenance personnel need to solve urgently is to integrally overhaul the oil cylinder of the hydraulic hoist of the rapid water inlet accident gate.

Because the oil cylinder of the hydraulic hoist at the water inlet belongs to a large oil cylinder, the external dimension thereof is phi 0.99m multiplied by 15.9m, and the weight of the empty cylinder is 54.8t (the total weight of oil is 59.8 t); the oil cylinder is vertically arranged at the height of 606 meters, and is supported by a spherical surface at the tail part, so that the adverse effect of the manufacturing and mounting errors of a hoist and a gate on the operation of the oil cylinder is eliminated. Surplus strokes are left in a rod cavity and a rodless cavity of the hydraulic cylinder so as to adapt to civil engineering and possible errors in manufacturing and installation of a gate lifting lug and ensure that the gate can be closed tightly; the piston rod hanging head at the lower end of the oil cylinder is connected with the pull rod. The hydraulic hoist oil cylinder does not have on-site disassembly and maintenance conditions, the oil cylinder must be hoisted to the 610-meter height of the water inlet dam crest from the existing station and then maintained or returned to a factory for maintenance, the construction period is long, the workload is large, and the operation difficulty and the safety risk are high.

Disclosure of Invention

The invention aims to solve the technical problem of providing a method for quickly disassembling and assembling a large oil cylinder of a gate in a high-water-head power station water inlet accident on site, which can shorten the construction period, reduce the workload of disassembling and assembling equipment and the difficulty of construction operation and reduce the safety risk of operation.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a method for assembling and disassembling a large oil cylinder of a rapid gate of a water inlet accident of a high-water head power station on site comprises the following steps:

step 1, installing protection, namely building a safety isolation fence at the position of a pump room orifice of a hoist and at the position of an accident rapid gate orifice; installing a guardrail and anti-falling equipment at a manhole opening passing up and down in the door slot;

step 2, erecting a platform, namely erecting a full-erection overhaul platform on an overhaul platform at the position of the oil cylinder hanging head;

step 3, cleaning the channel, and removing an orifice bearing cover plate of a pump room of a water inlet dam surface in the oil cylinder hoisting channel, a canopy at an orifice part in the pump room and an orifice cover plate of a gate in the pump room;

step 4, replacing the oil pipe, replacing the oil supply pipe with a rod cavity beside the oil cylinder, wherein the replaced oil supply pipe is a high-pressure hose with a ball valve;

step 5, withdrawing the hanging head, namely withdrawing the connecting shaft of the hanging head of the piston rod of the oil cylinder and the pull rod of the gate so as to effectively separate the oil cylinder and the connected emergency gate;

step 6, fixing the hanging head, fixing the retracted hanging head at a fully retracted position, and additionally adding a hard fixing part to reinforce and lock the hanging head;

step 7, dismantling the pipelines, and dismantling all the pipelines connecting the oil cylinder and the hydraulic system;

step 8, tool installation, namely installing a temporary hoisting and turning tool on the upper end surface of the oil cylinder; the turnover tool structure comprises two lug plates arranged at the upper part of a flange plate, and a pin shaft penetrates through the lug plates to be connected with a lifting lug;

step 9, hoisting the oil cylinder by adopting a water inlet dam surface gantry crane, connecting the oil cylinder with a lifting lug of the gantry crane through an installed turnover tool, keeping the lifting lug of the gantry crane and the oil cylinder in a vertical state, hoisting the lifting lug out of a gate orifice and placing the lifting lug in a turning radius of a truck crane;

step 10, turning over and leveling, namely, turning over and leveling an oil cylinder by using a truck crane and a portal crane, leveling the oil cylinder, placing the oil cylinder at a non-hole position, padding battens below the oil cylinder during placement, adjusting the position of an oil through hole of a rod cavity of the oil cylinder to be positioned right below the oil cylinder, preparing for subsequent oil discharge, and simultaneously making measures for preventing the oil cylinder from rolling;

step 11, discharging oil from the oil cylinder, emptying oil in a rod cavity of the oil cylinder through a control ball valve of an externally connected high-pressure hose, removing the externally connected high-pressure hose after emptying, installing a zero-hour blocking plate, and performing sealing measures;

step 12, loading and returning to a factory, after hydraulic oil in the oil cylinder is emptied, hoisting the oil cylinder to a transport trailer by using the cooperation of a gantry crane and a truck crane, and firmly binding the oil cylinder to a vehicle body;

step 13, the oil cylinder is installed again, and after the oil cylinder is transported to the site, the oil cylinder is hoisted to a working position according to the reverse sequence of the step 4 to the step 11 and is connected with a corresponding pipeline;

step 14, adjusting the oil cylinders in a joint mode, and after the oil cylinders are installed, performing a full-stroke exhaust test and a system pressure test on the oil cylinders;

and step 15, dismantling the protection, and after all the work is finished, dismantling the safety protection set up in the early stage and recovering to the state before the work.

In step 4, the gate is quickly closed to a full-closed position, and at the moment, a piston in the oil cylinder is attached to the lower end cover of the oil cylinder; and (3) closing an oil through valve of an oil supply pipe with a rod cavity of the oil cylinder in the pump room, loosening the oil supply pipe with the rod cavity and an oil cylinder connecting flange beside the oil cylinder, discharging oil in a pipeline, loosening an oil pipe clamp beside the cylinder, removing the oil supply pipe with the rod cavity beside the cylinder, and connecting the oil supply pipe with the rod cavity and an oil supply hole in a lower cavity of the oil cylinder by using a high-pressure hose with a valve.

In step 5, the connecting shaft of the piston rod of the oil cylinder and the connecting shaft of the gate pull rod retreats, and the specific method is that the replaced high-pressure oil pipe is connected with a hydraulic system, so that the piston rod of the oil cylinder is controlled, the gate pull rod is lifted to an EL.589m platform to be locked, then the connecting shaft of the piston rod of the oil cylinder and the connecting shaft of the gate pull rod is detached, and the oil cylinder and the field accident gate are ensured to be separated.

In step 6, the oil cylinder piston rod is controlled through the communicated high-pressure hose system, the oil cylinder piston rod is recovered to zero stroke, a ball valve externally connected with the high-pressure hose is closed, and the oil cylinder piston rod hanging head is fixed through a steel wire rope or a hanging strip.

In step 7, completely closing an oil cylinder rodless cavity oil supply ball valve, a rod cavity oil supply ball valve and an oil cylinder rodless cavity oil supplement ball valve in the pump room, removing a rodless cavity oil supply pipe and an oil supplement pipe which are connected with the oil cylinder in the pump room, removing the connection between the hose and the rod cavity oil supply pipeline in the pump room, hanging the high-pressure hose on the lower end cover of the oil cylinder through a steel wire rope, and taking the hose out of the orifice of the gate when the oil cylinder is hoisted in the later period.

In step 8, the method is to dismantle the oil cylinder openness instrument, and install a lifting appliance through the center hole of the openness instrument to dismantle the upper end cover of the oil cylinder; and connecting the flange of the turnover tool with the upper end part of the oil cylinder.

In step 9, the oil cylinder is lifted by a gantry crane at the dam surface of the water inlet, the gantry crane is connected with a lifting lug of the gantry crane through a flange of an installed turnover tool, the lifting lug of the gantry crane and the oil cylinder are kept in a vertical state, the lifting lug of the gantry crane is lifted out of an orifice of a pump house, the lowest point of the bottom of the oil cylinder is higher than the dam surface by about 0.5 meter or more, and then the lifting lug of the gantry crane is stably moved to an open position and is positioned within the turning radius of the truck crane.

In step 11, a zero-time transfer pool required by oil discharge is set before oil discharge, oil in the oil cylinder is controlled by an external high-pressure hose to control a ball valve of the oil cylinder to prevent the oil from being emptied into the transfer pool, and then the oil cylinder is pumped into a special oil drum through an oil pumping trolley and then is subjected to centralized processing.

In step 14, after the oil cylinder is installed, performing a three-time full-stroke exhaust test on the oil cylinder, specifically, in the door opening process, externally connecting a pressure measuring hose at the top of an oil cylinder opening instrument for discharging air in a rodless cavity of the oil cylinder, and discharging gas in a rod cavity of the oil cylinder out of the oil tank after flowing back to the oil tank along with hydraulic oil through a door to realize effective exhaust of the interior of the oil cylinder; the system pressure test and setting mainly debugs various pressure relays of a hydraulic system and an oil cylinder, ensures that the pressure relays transmit correct signals, realizes effective protection of the hydraulic system, and ensures that the oil cylinder runs stably without vibration and the hydraulic system runs normally.

The invention has the following beneficial effects:

a rod cavity oil supply pipe beside the oil cylinder is replaced by a high-pressure hose with a ball valve, so that the subsequent control on an oil cylinder piston rod and the subsequent oil cylinder hoisting pass through a central hole of an oil cylinder support frame;

before and after hoisting, the hoisting head is retreated from the shaft and fixed, so that the safety hoisting of the oil cylinder is ensured, the piston rod of the oil cylinder cannot slide down due to dead weight in the hoisting process, and the safety is improved;

a turnover tool is connected with the upper end surface of the oil cylinder and the lifting lug and matched with a gantry crane and a steam crane to realize turnover;

the gate is quickly closed to a fully closed position, and when oil in a rod cavity of the oil cylinder is minimum, the oil pipe is replaced.

Drawings

The invention is further illustrated by the following examples in conjunction with the accompanying drawings:

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a plan layout view of the hydraulic pump station of the present invention.

Fig. 3 is a schematic sectional view at a-a of fig. 2.

Fig. 4 is a schematic structural diagram of the gantry crane of the present invention.

FIG. 5 is a schematic view of the cylinder being hoisted out of the pump room orifice in accordance with the present invention.

FIG. 6 is a schematic diagram of the present invention showing the turning over of the cylinder in situ.

Fig. 7 is a schematic structural diagram of the turning tool of the invention.

Fig. 8 is a top view of fig. 7.

Fig. 9 is a schematic structural diagram of the oil cylinder of the present invention.

In the figure: the system comprises a gantry crane 1, a lifting lug 2, a pump room orifice cover plate 3, a hydraulic pump station 4, a rodless cavity oil supply pipe 41, an oil supply pipe 42, a rod cavity oil supply pipe 43, an oil cylinder opening instrument 44, a gate orifice cover plate 5, an oil cylinder 6, a piston 61, an oil cylinder lower end cover 62, an oil cylinder piston rod 63, an oil cylinder piston rod hanging head 64, a platform 7, a cantilever platform 8, a gate pull rod 9 and an accident gate 10.

Detailed Description

As shown in fig. 1 to 9, a method for assembling and disassembling a large-scale oil cylinder of a high-head power station water inlet accident quick gate on site comprises the following steps:

step 1, installing protection, namely building a safety isolation fence at the position of a pump room orifice of a hoist and at the position of an accident rapid gate orifice; installing a guardrail and anti-falling equipment at a manhole opening passing up and down in the door slot; the method aims to realize effective protection of the adjacent edge area in the overhaul area.

Preferably, in step 1, special protective isolation fences are erected at the opening of the pump room of the hoist of the EL.610 platform and the opening of the gate and the opening of the personnel passage in the EL.606 pump room.

Step 2, erecting a platform, and erecting a full-erection overhaul platform 7 on an overhaul platform 7 at the head hanging part of the oil cylinder 6; the purpose is to ensure the safety of the overhaul region.

Preferably, an operation platform for the operation of maintainers is erected on the EL.577 overhanging platform 8 in the gate orifice, and the platform can effectively cover the hollow part of the gate orifice.

Step 3, cleaning the channel, and removing the oil cylinder 6 to lift an orifice bearing cover plate of a pump room at the dam surface of the water inlet in the channel, a canopy at the orifice part in the pump room and a gate orifice cover plate 5 in the pump room; the device aims to remove the interference equipment in the lifting channel through the lifting lugs 2 on the gantry crane 1.

Step 4, replacing the oil pipe, replacing the oil supply pipe with a rod cavity beside the cylinder of the oil cylinder 6, wherein the replaced oil supply pipe is a high-pressure hose with a ball valve; the oil supply pipe beside the cylinder needs to be detached and replaced by a high-pressure hose with a ball valve, so that the subsequent control of the piston rod of the oil cylinder and the oil cylinder hoisting can be facilitated to pass through the center hole of the oil cylinder support frame.

Step 5, withdrawing the hanging head, namely withdrawing the connecting shaft of the hanging head 64 of the piston rod of the oil cylinder and the pull rod 9 of the gate, so that the oil cylinder 6 and the connected emergency gate 10 are effectively separated; the purpose is to ensure the safe lifting of the oil cylinder.

Step 6, fixing the hanging head, fixing the retracted hanging head at a fully retracted position, and additionally adding a hard fixing part to reinforce and lock the hanging head; the lifting device aims to ensure that the piston rod of the oil cylinder cannot slide down due to dead weight in the lifting process of the oil cylinder.

Step 7, dismantling the pipelines, and dismantling all the pipelines connecting the oil cylinder 6 and the hydraulic system; the purpose is to ensure that no traction object exists in the lifting process of the oil cylinder.

Step 8, tool installation, namely installing a temporary hoisting and turning tool on the upper end surface of the oil cylinder 6; the turnover tool structure comprises two lug plates arranged at the upper part of a flange plate, and a pin shaft penetrates through the lug plates to be connected with the lifting lug 2; the quick door oil cylinder and the rack are supported in a suspension mode through spherical end flanges, so that a gap between the outer wall of the oil cylinder and the rack is very small, and a lifting point required by lifting can not be installed on the outer wall of the oil cylinder, so that the lifting and turning-over work of the oil cylinder in the later period can be met.

Step 9, hoisting the oil cylinder 6 by adopting a water inlet dam face gantry crane 1, connecting the oil cylinder with a lifting lug 2 of the gantry crane 1 through an installed turning tool, keeping the lifting lug 2 of the gantry crane 1 and the oil cylinder 6 in a vertical state, hoisting the oil cylinder out of a gate orifice and placing the oil cylinder in a slewing radius of a truck crane;

step 10, turning over and leveling, namely, turning over and leveling the oil cylinder 6 by adopting a truck crane and a portal crane 1, leveling the oil cylinder, placing the oil cylinder at a non-hole position, padding battens below the oil cylinder during placement, adjusting the position of an oil through hole of a rod cavity of the oil cylinder 6 to be right below the oil cylinder, preparing for subsequent oil discharge, and simultaneously making measures for preventing the oil cylinder 6 from rolling;

step 11, discharging oil from the oil cylinder, emptying oil in a rod cavity of the oil cylinder 6 through a control ball valve of an external high-pressure hose, removing the external high-pressure hose after emptying, installing a zero-hour blocking plate, and performing sealing measures; its aim at prevents inside air and the rainwater entering hydro-cylinder.

Step 12, loading and returning to a factory, after hydraulic oil in the oil cylinder 6 is emptied, hoisting the hydraulic oil to a transport trailer by using the cooperation of the gantry crane 1 and a truck crane, and firmly binding the hydraulic oil to a vehicle body; its purpose is to prevent side tumbling and sliding.

Step 13, the oil cylinder is installed again, and after the oil cylinder 6 is transported to the site, the oil cylinder 6 is hoisted to a working position according to the reverse sequence of the steps 4 to 11 and is connected with a corresponding pipeline;

step 14, performing joint adjustment of the oil cylinders, and performing a full-stroke exhaust test and a system pressure test on the oil cylinders 6 after the oil cylinders 6 are installed; the method aims to ensure that the oil cylinder runs stably without vibration, each alarm value of the system is correctly set, and the pressure value of the system is normal.

And step 15, dismantling the protection, and after all the work is finished, dismantling the safety protection set up in the early stage and recovering to the state before the work.

In step 4, the gate is quickly closed to a fully closed position, and at the moment, a piston 61 in the oil cylinder 6 is attached to an oil cylinder lower end cover 62; and (3) closing an oil valve of an oil cylinder rod cavity oil supply pipe 43 in the pump room, loosening the oil supply pipe with the rod cavity and an oil cylinder connecting flange beside the oil cylinder, discharging oil in a pipeline, loosening an oil pipe clamp beside the cylinder, removing the oil supply pipe 43 with the rod cavity beside the cylinder, and connecting the oil supply pipe with the rod cavity and an oil supply hole in an oil cylinder lower cavity in the pump room by using a high-pressure hose with a valve.

In step 5, the oil cylinder piston rod hanging head 64 and the gate pull rod 9 are connected with the shaft and are retreated, the specific method is that the replaced high-pressure oil pipe is connected with a hydraulic system, so that the oil cylinder piston rod 63 is controlled, the gate pull rod 9 is lifted to the EL.589m platform 7 to be locked, then the oil cylinder piston rod hanging head 64 and the gate pull rod 9 connecting shaft are detached, and the oil cylinder 6 and the field accident gate 10 are ensured to be separated.

In step 6, the oil cylinder piston rod 63 is controlled by the connected high-pressure hose system, the oil cylinder piston rod 63 is retracted to zero stroke, a ball valve externally connected with a high-pressure hose is closed, and an oil cylinder piston rod hanging head 64 is fixed through a steel wire rope or a hanging strip.

In step 7, completely closing an oil cylinder rodless cavity oil supply ball valve, a rod cavity oil supply ball valve and an oil cylinder rodless cavity oil supplement ball valve in the pump room, removing a rodless cavity oil supply pipe 41 and an oil supplement pipe 42 which are connected with the oil cylinder in the pump room, removing the connection between the hose and the rod cavity oil supply pipeline in the pump room, hanging the high-pressure hose on the lower end cover of the oil cylinder through a steel wire rope, and taking the hose out of the orifice of the gate together when the oil cylinder is hoisted in the later period.

In step 8, the method is to dismantle the oil cylinder opening instrument 44, and install a lifting appliance through a central hole of the opening instrument to dismantle the upper end cover of the oil cylinder; and connecting the flange of the turnover tool with the upper end part of the oil cylinder.

In step 9, the gantry crane at the water inlet dam surface is used for hoisting the oil cylinder, the gantry crane lifting lug 2 is connected with the gantry crane lifting lug 2 through a flange plate of the installed turnover tool, the gantry crane lifting lug 2 and the oil cylinder 6 are kept in a vertical state, the gantry crane lifting lug is lifted out of the opening of the pump house, the lowest point of the bottom of the oil cylinder is higher than the dam surface by about 0.5 meter or more, and then the gantry crane is stably moved to an open position and is located within the turning radius of the truck crane.

In step 11, a zero-time transfer pool required by oil discharge is set before oil discharge, oil in the oil cylinder is controlled by an external high-pressure hose to control a ball valve of the oil cylinder to prevent the oil from being emptied into the transfer pool, and then the oil cylinder is pumped into a special oil drum through an oil pumping trolley and then is subjected to centralized processing.

In step 14, after the oil cylinder is installed, performing a three-time full-stroke exhaust test on the oil cylinder, specifically, in the door opening process, externally connecting a pressure measuring hose at the top of an oil cylinder opening instrument for discharging air in a rodless cavity of the oil cylinder, and discharging gas in a rod cavity of the oil cylinder out of the oil tank after flowing back to the oil tank along with hydraulic oil through a door to realize effective exhaust of the interior of the oil cylinder; the system pressure test and setting mainly debugs various pressure relays of a hydraulic system and an oil cylinder, ensures that the pressure relays transmit correct signals, realizes effective protection of the hydraulic system, and ensures that the oil cylinder runs stably without vibration and the hydraulic system runs normally.

The above-described embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and features in the embodiments and examples in the present application may be arbitrarily combined with each other without conflict. The protection scope of the present invention is defined by the claims, and includes equivalents of technical features of the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the invention.