CN209820955U - Block bar storage and maintenance rack for pressure-resistant shell hydrostatic test - Google Patents
Block bar storage and maintenance rack for pressure-resistant shell hydrostatic test Download PDFInfo
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- CN209820955U CN209820955U CN201920419281.2U CN201920419281U CN209820955U CN 209820955 U CN209820955 U CN 209820955U CN 201920419281 U CN201920419281 U CN 201920419281U CN 209820955 U CN209820955 U CN 209820955U
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Abstract
The utility model belongs to the technical field of nuclear power station maintenance, in particular to a plugging rod storage and maintenance rack for a pressure-resistant shell hydrostatic test; the device comprises two plugging rod storage cylinders, an upper-layer maintenance platform, steps, supporting legs and transverse reinforcing beams, wherein the upper-layer maintenance platform, the steps, the supporting legs and the transverse reinforcing beams are welded into a maintenance rack with a stepped structure; the utility model discloses ensured staff's safety, improved stifled excellent maintenance efficiency.
Description
Technical Field
The utility model belongs to the technical field of the nuclear power station overhauls, concretely relates to withstand voltage shell hydrostatic test deposits and maintains rack with stifled stick.
Background
The pressure hull for the first stage of engineering in a nuclear power plant is a flanged sleeve made of stainless steel 08X18H10T (Russian standard) and used for installing the inner part and the outer part of a control rod driving mechanism. The lower flange of the pressure-resistant shell is connected with a control rod driving mechanism connecting pipe on the top cover of the reactor, and the upper part of the pressure-resistant shell forms a closed pressure-resistant shell through an end plug. When the power station is disassembled and overhauled, all the pressure-resistant shells are reinstalled and leveled, and then a hydraulic test of 24.5MPa is carried out by using a hydraulic test special tool.
The special tool for the hydrostatic test of the pressure shell (shown in figure 1) consists of three parts, namely a plug, a blocking rod and a pressing pipeline. Wherein, the sealing principle between the plugging rod (the head structure is shown in figure 2) and the connecting pipe of the driving mechanism is as follows: the special spanner fastens the compression nut 6, the sleeve 7 is pressed downwards, and the rubber ring 10 expands and clings to the inner wall of the connecting pipe of the driving mechanism under the extrusion action of the sleeve and the upper detachable part 9, so that sealing is realized.
Before each pressure shell hydrostatic test, the integrity of the rubber ring on the blocking rod needs to be checked, if the rubber ring is damaged, the rubber ring needs to be replaced, and each rubber ring is allowed to be used twice at most. Therefore, the rubber ring on the stopper rod needs to be replaced frequently during the whole hydraulic test of the pressure shell. A platform for overhauling and maintaining the plugging rod is not designed in the overhauling process, the plugging rod is bound and fixed on a steel structure upright on site, and a worker climbs to the position near the head of the plugging rod to execute the work of replacing the rubber ring, lubricating the outer surface of the plugging rod and the like. The parts detached in the rubber ring replacement process need to be matched and transferred below by another worker. Because sleeve 7 is heavier, there is great mechanical injury risk in dismouting, transmission process.
In addition, there are also equipment damage and personnel injury risks caused by the toppling of the blocking rod in the prior art. Considering above-mentioned risk and drawback, combining equipment structure and on-the-spot actual conditions, need design a withstand voltage shell hydrostatic test and deposit and maintain the rack with stifled stick for solve above-mentioned technical problem.
SUMMERY OF THE UTILITY MODEL
The utility model aims at: according to the structure of the blocking rod for the pressure-resistant shell hydrostatic test, the blocking rod storage and maintenance rack for the pressure-resistant shell hydrostatic test is developed, a suitable and safe platform is provided for storage and maintenance of the blocking rod, safety of workers is guaranteed, and blocking rod maintenance efficiency is improved.
The technical scheme of the utility model is that:
the utility model provides a withstand voltage shell hydrostatic test is with stifled stick storage maintenance rack, includes two stifled stick storage tube, upper maintenance platform, step, supporting leg and horizontal reinforcing beam, and wherein upper maintenance platform, step, supporting leg and horizontal reinforcing beam weld into the ladder structure and maintain the rack, two stifled stick storage tube are arranged on maintaining the rack according to on-the-spot different operating mode.
And a guide head is arranged at the upper end of the blocking rod storage cylinder.
The inner wall of the guide head is designed into an inverted cone shape.
The bottom of the blocking rod storage cylinder is provided with a drain hole.
An inclined reinforcing beam is welded on the maintenance rack to reinforce the whole maintenance rack.
The reinforcing beam is welded with the bottoms of the two blocking rod storage cylinders to stabilize the bottom of the storage cylinder.
Four lifting lugs are designed on the maintenance rack and used for lifting the rack, and the position of the rack in the upper component inspection well can be adjusted.
The utility model has the advantages that:
1. during disassembly and overhaul of a certain nuclear power station, a blocking rod storage and maintenance rack for a pressure shell hydrostatic test is placed at a specified position of an upper component inspection well in advance, and hoisting and other overhaul work of an upper component are not influenced completely;
2. during the withstand voltage shell hydrostatic test, stifled stick is directly deposited on the rack, eliminates stifled stick risk of toppling over. Workers can climb on the maintenance platform of the rack by means of the steps of the rack, and can finish rubber ring replacement and outer surface lubrication operation of the blocking rod on the platform by only one worker;
3. parts disassembled from the blocking rod can be stored on the platform in the process, so that the industrial safety risk of personnel is eliminated;
4. the use of the rack greatly reduces the operation time of the maintenance work of the blocking rod, thereby shortening the time of major repair of the key path.
Drawings
FIG. 1 is a schematic diagram of a hydrostatic test of a pressure housing;
FIG. 2 is a schematic view of a stopper rod head;
FIG. 3 is a sectional view of a plugging rod storage and maintenance rack for a hydrostatic test of a pressure-resistant shell according to the present invention;
FIG. 4 is a structural diagram of a plugging rod storage and maintenance rack for a hydrostatic test of a pressure-resistant shell according to the present invention;
FIG. 5 is a bottom view of a plugging rod storage barrel of the plugging rod storage maintenance rack for the pressure-resistant shell hydrostatic test designed by the present invention;
fig. 6 is a schematic view of the reinforcing beam for storing the maintenance bench for the blocking rod of the pressure-resistant shell hydrostatic test.
Wherein: 1-pressure shell, 2-plug, 3-plug rod, 4-top component top cover, 5-drive mechanism connecting pipe, 6-gland nut, 7-sleeve, 8-key, 9-upper detachable part, 10-rubber ring, 11-lower supporting part and 12-plug rod storage barrel; 13-a guide head; 14-hydrophobic pores; 15-upper maintenance platform; 16-step; 17-supporting legs; 18-transverse reinforcing beams; 19-oblique reinforcing beam; 20, lifting eyes.
Detailed Description
The invention will be further described with reference to the accompanying drawings:
the utility model provides a withstand voltage shell hydrostatic test is with stifled stick storage maintenance rack, includes two stifled stick storage barrel 12, upper maintenance platform 15, step 16, supporting leg 17 and horizontal reinforcing beam 18, wherein upper maintenance platform 15, step 16, supporting leg 17 and horizontal reinforcing beam 18 weld into the ladder structure and maintain the rack, two stifled stick storage barrel 12 are arranged on maintaining the rack according to on-the-spot different operating mode.
The upper end of the blocking rod storage barrel 12 is provided with a guide head 13.
The inner wall of the guide head 13 is designed to be of an inverted cone shape.
The bottom of the blocking rod storage barrel 12 is provided with a water drainage hole 14.
An inclined reinforcing beam 19 is welded on the maintenance rack to reinforce the whole maintenance rack.
The reinforcing beam 19 is welded with the bottoms of the two blocking rod storage cylinders to stabilize the bottom of the storage cylinder.
Four lifting lugs are designed on the maintenance rack and used for lifting the rack, and the position of the rack in the upper component inspection well can be adjusted.
Examples
The main steel structure of the storage and maintenance rack (see figure 3) for the blocking rod for the pressure-resistant shell hydrostatic test is formed by splicing and welding angle steels, and the storage and maintenance bearing requirements are completely met through a load test on the structural strength. Steel plates are laid and welded on the surface of the steel structure to form steps 16 for workers to go up and down and an upper maintenance platform 15. The upper maintenance platform provides the operation space for the staff, can deposit required instrument, consumptive material and follow the spare part of dismantling on the stifled stick in the rubber circle replacement process temporarily simultaneously. Two plugging rod storage cylinders 12 are arranged on the rack according to the requirements of site operation positions, and two plugging rods can be stored or maintained at the same time. The guide head 13 is welded at the head of the blocking rod storage barrel, the inner wall of the guide head is designed into an inverted cone shape, so that the blocking rod is conveniently hung into the storage barrel, and the blocking rod is prevented from being damaged due to collision and friction. The bottom of the blocking rod storage cylinder is provided with a drainage hole 14 for discharging residual water attached to the blocking rod and preventing water from accumulating in the blocking rod storage cylinder. The rack design has slant reinforcing beam 19, consolidates whole main part steel construction, simultaneously, deposits bobbin base portion with two stifled stick storage tube bottom welding, stabilizes. The rack design has four lugs for hoisting the rack and can adjust the position of the rack in the upper assembly inspection well.
Application and benefit of blocking rod storage and maintenance rack for pressure-resistant shell hydrostatic test
During the disassembly and overhaul of the unit, the blocking rod storage and maintenance rack for the pressure shell hydrostatic test is placed at the designated position of the upper component inspection well in advance. During the hydrostatic test of the pressure shell, the blocking rod is stored in the blocking rod storage barrel. The staff arrives the bench upper maintenance platform through the step and carries out work such as rubber circle change, stifled excellent surface inspection, restoration, lubrication. Consumables, equipment parts and the like used in the period can be temporarily placed on the platform without the cooperation of extra personnel. The drain hole below of stifled stick storage cylinder bottom is laid waste water and is collected the bag and collect adnexed residual water on the stifled stick, prevents that radioactive wastewater from diffusing to cause the place to pollute or damage near equipment. The blocking rod storage and maintenance rack for the pressure shell hydrostatic test is successfully applied in two times of disassembly and overhaul.
The application of the rack obtains good economic benefit and social benefit:
(1) shortening construction period of pressure-resistant shell hydrostatic test
The application of the rack saves the time for binding and fixing the blocking rod and the time for transferring parts up and down by personnel, reduces the time for replacing the rubber ring of the blocking rod, and shortens the construction period of the pressure shell hydrostatic test. According to statistics, compared with the original method, the maintenance time of the blocking rod during the whole pressure shell hydrostatic test is shortened from 8h to 4h on average, the major repair time critical path time occupied by the pressure shell hydrostatic test is directly shortened, and good economic benefits are indirectly created.
(2) Reducing the exposure dose of the staff
Due to the application of the rack, the maintenance time of the blocking rod is shortened, the number of workers is reduced, and the irradiated dose of the workers is reduced. The environmental dose of the plug rod maintenance site is about 0.05mSv/h, and the application of the bench reduces the collective dose of workers to about 0.05 × 4+0.05 × 8-0.6 man.
(3) Eliminating personnel industrial safety risks and radiation safety risks
The application of rack makes the staff need not climb the steel construction in the inspection shaft from top to bottom, does not need to transmit heavier equipment spare part from top to bottom, eliminates the industrial safety risk in the stifled excellent maintenance process. The rack makes things convenient for the collection that the radioactive wastewater was remained to stifled stick in structural design, prevents that radioactive wastewater from gathering, diffusing, eliminates radiation safety risk.
The utility model relates to a stifled stick is deposited and maintenance rack can be promoted to depositing and maintaining work of other similar equipment in power station for the withstand voltage shell hydrostatic test of preparation.
The utility model discloses also have good reference meaning to depositing and maintaining work with other similar equipment of trade.
Claims (7)
1. The utility model provides a withstand voltage shell hydrostatic test deposits with stifled stick and maintains rack which characterized in that: the method comprises the following steps: the device comprises two blocking rod storage cylinders (12), an upper-layer maintenance platform (15), steps (16), supporting legs (17) and transverse reinforcing beams (18), wherein the upper-layer maintenance platform (15), the steps (16), the supporting legs (17) and the transverse reinforcing beams (18) are welded into a ladder-structure maintenance rack, and the two blocking rod storage cylinders (12) are arranged on the maintenance rack according to different working conditions on site.
2. The storage and maintenance rack for the blocking rod of the hydraulic test of the pressure shell according to claim 1, characterized in that: the upper end of the blocking rod storage cylinder (12) is provided with a guide head (13).
3. The storage and maintenance rack for the blocking rod of the hydraulic test of the pressure shell, according to claim 2, is characterized in that: the inner wall of the guide head (13) is designed to be of an inverted cone shape.
4. The storage and maintenance rack for the blocking rod of the hydraulic test of the pressure shell according to claim 1, characterized in that: the bottom of the blocking rod storage cylinder (12) is provided with a water drainage hole (14).
5. The storage and maintenance rack for the blocking rod of the hydraulic test of the pressure shell according to claim 1, characterized in that: an inclined reinforcing beam (19) is further welded on the maintenance rack to reinforce the whole maintenance rack.
6. The storage and maintenance rack for the blocking rod of the hydraulic test of the pressure shell, according to claim 5, is characterized in that: the reinforcing beam (19) is welded with the bottoms of the two blocking rod storage cylinders to stabilize the bottoms of the storage cylinders.
7. The storage and maintenance rack for the blocking rod of the hydraulic test of the pressure shell according to claim 1, characterized in that: four lifting lugs are designed on the maintenance rack and used for lifting the rack, and the position of the rack in the upper component inspection well can be adjusted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920419281.2U CN209820955U (en) | 2019-03-29 | 2019-03-29 | Block bar storage and maintenance rack for pressure-resistant shell hydrostatic test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920419281.2U CN209820955U (en) | 2019-03-29 | 2019-03-29 | Block bar storage and maintenance rack for pressure-resistant shell hydrostatic test |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209820955U true CN209820955U (en) | 2019-12-20 |
Family
ID=68877850
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920419281.2U Active CN209820955U (en) | 2019-03-29 | 2019-03-29 | Block bar storage and maintenance rack for pressure-resistant shell hydrostatic test |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209820955U (en) |
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2019
- 2019-03-29 CN CN201920419281.2U patent/CN209820955U/en active Active
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