Partial dismounting method of regulator insulation layer keel

Abstract

The present application belongs to the technical field of nuclear power heat preservation, and discloses a local dismounting method for a heat preservation layer keel frame of a stabilizer, comprising the following steps: S1, partially dismounting one of the longitudinal keels in the longitudinal keels in the heat preservation layer keel frame, so that the welding seam at the position of the longitudinal keel is exposed; S2, inspecting the welding seam at the position of the longitudinal keel, and then reversely mounting the longitudinal keel; and S3, repeating S1-S2 to dismount the remaining longitudinal keels until all the longitudinal keels are dismounted at least once. The above method is used for the inspection, in which only one longitudinal keel is partially dismounted each time, so that the shearing force borne by each part of the heat preservation layer keel frame is kept within the design range, the operation safety is ensured, the dismounting of the whole heat preservation layer keel frame is avoided, the cost of the inspection is greatly reduced, the input of manpower and material resources is reduced, the efficiency of the inspection operation is improved, and the influence on the production capacity of the nuclear power station is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nuclear power heat preservation, and in particular to a method for locally disassembling a keel of a heat preservation layer of a pressurizer. BACKGROUND

[0002] With the development of the times, people's dependence on natural energy is becoming greater and greater, and with it comes the worry about the overuse of non-renewable natural resources. Therefore, people turn their attention to the field of nuclear power, which can generate a large amount of energy, by controlling the nuclear fission of metal uranium, so as to generate a large amount of energy in the nuclear fission process, so as to alleviate the energy crisis of the contemporary era.

[0003] In addition to the reactor, the pressurizer is also an important equipment in the nuclear power plant, which can maintain the pressure in the nuclear power loop and ensure the safety of the nuclear power loop. The temperature change around the pressurizer can easily affect the working capacity of the pressurizer, so a heat preservation layer is usually provided around the pressurizer to control the temperature around the pressurizer within a stable range.

[0004] As a special equipment, in order to ensure the safe operation of the equipment, the welds on the surface of the pressurizer are usually subjected to periodical inspection. However, the heat preservation layer is provided around the pressurizer, and the welds need to be exposed during the inspection, so the heat preservation layer needs to be disassembled. The heat preservation layer includes a heat preservation layer keel frame and a plurality of heat preservation blocks, the heat preservation layer keel frame is suspended and supported by the top of the pressurizer, and the heat preservation blocks are laid on the surface of the heat preservation layer keel frame. During the inspection, the welds arranged along the surface of the pressurizer are usually disassembled, and then the heat preservation layer keel frame is disassembled layer by layer from the bottom until the heat preservation layer keel frame is completely disassembled, so that the circumferential welds are exposed. However, the inspection period is tight, and the disassembly and reassembly of the heat preservation layer consume a large amount of manpower, resulting in a significant increase in the cost and number of personnel for the inspection, and slowing down the construction efficiency and affecting the production capacity of the nuclear power plant. SUMMARY

[0005] The present application aims to provide a method for locally disassembling a heat preservation layer keel frame of a pressurizer, to solve the technical problem that the heat preservation layer and the heat preservation layer keel frame can only be disassembled as a whole when the welds on the surface of the pressurizer are inspected, which is time-consuming and labor-intensive and slows down the construction efficiency.

[0006] To achieve this purpose, the present application adopts the following technical solutions:

[0007] The application discloses a partial dismounting method for a heat insulation layer keel frame of a voltage stabilizer, and is used for role inspection of a circumferential weld on a surface of the voltage stabilizer. The heat insulation layer keel frame comprises a plurality of longitudinal keels, a plurality of first circumferential keels and a plurality of second circumferential keels. Each of the plurality of longitudinal keels is in abutment with the surface of the voltage stabilizer. A first circumferential keel and a second circumferential keel are arranged between every two longitudinal keels. The first circumferential keel is located above the weld, and the second circumferential keel is located below the weld. The method comprises the following steps.

[0008] S1, a part of one of the plurality of longitudinal keels in the heat insulation layer keel frame is dismounted, so that the weld at the position of the longitudinal keel is exposed;

[0009] S2, the weld at the position of the longitudinal keel is overhauled, and then the longitudinal keel is mounted in reverse order;

[0010] S3, S1-S2 is repeated, and the remaining longitudinal keels are dismounted until all the longitudinal keels are dismounted at least once.

[0011] As preferred, the bottom end of part of the longitudinal keels is connected with a first connecting keel. The longitudinal keel comprises a long keel. S1 comprises the following steps.

[0012] The nut at the connecting position of the long keel and the first circumferential keel is dismounted;

[0013] Two first circumferential keels are respectively rotated around the end thereof far away from the long keel until the first circumferential keel is far away from the long keel;

[0014] The nuts at the two ends of the second circumferential keels on the two sides of the long keel are dismounted, and the two second circumferential keels are dismounted;

[0015] The nut at the bottom end of the first connecting keel is dismounted;

[0016] The bottom end of the long keel drives the first connecting keel to rotate upwards around the top end of the long keel until the first connecting keel is far away from the surface of the voltage stabilizer.

[0017] As preferred, one side of the long keel is provided with a supporting disc and a supporting bolt. The supporting disc and the supporting bolt are in threaded connection with the long keel. The supporting disc and the supporting bolt can abut against the voltage stabilizer. After the two second circumferential keels are dismounted, the method comprises the following steps.

[0018] The nuts at the two ends of the first connecting keel are loosened;

[0019] The supporting bolt is tightened so that the supporting disc can rotate;

[0020] The supporting disc is rotated so that the supporting disc is far away from the voltage stabilizer until the supporting disc is not in contact with the voltage stabilizer after the supporting bolt is loosened. The number of rotation circles of the supporting disc is recorded;

[0021] Loosen the support bolt to make the long keel fall to the stabilizer support long keel.

[0022] As preferably, the long keel is loosened after the support bolt to make the long keel fall to the stabilizer support long keel, including:

[0023] Record the position of the long keel on the stabilizer surface at this time.

[0024] As preferably, the S2 includes:

[0025] Make the long keel fall to the recorded position on the stabilizer surface;

[0026] Adjust the position of the long keel relative to the stabilizer;

[0027] Install the nut at the bottom end of the first connecting keel;

[0028] Reinstall the two second ring keels and install the nuts at the two ends of the second ring keels on both sides of the long keel;

[0029] Turn the two first ring keels around their ends away from the long keel, until the free ends of the first ring keels can be connected with the long keel;

[0030] Install the nuts at the connection between the first ring keel and the long keel.

[0031] As preferably, the adjustment of the position of the long keel relative to the stabilizer includes:

[0032] Tighten the support bolt to make the long keel rise to the support disc with enough rotation space;

[0033] Reverse rotation of the support disc according to the recorded number of rotation turns;

[0034] Loosen the support bolt to make the long keel fall to the support disc and the stabilizer abutting and supporting the long keel.

[0035] As preferably, the long keel is loosened after the support bolt to make the long keel fall to the stabilizer support long keel, including:

[0036] Set a positioning member between the top end of the long keel and the stabilizer, so that the relative position between the long keel and the stabilizer is fixed.

[0037] As preferably, the heat preservation layer keel frame further includes a manhole belt keel and a third ring keel, the manhole belt keel is connected with the bottom end of the long keel, the manhole belt keel includes an upper half and a lower half, the upper end of the upper half is connected with the long keel, the lower end is connected with the upper end of the lower half, the lower end of the lower half is connected with the third ring keel through the second connecting keel, and the S1 includes:

[0038] Remove the nuts at the connection between the long keel and the first ring keel;

[0039] Turning the two first ring keels around their ends away from the long keel until the first ring keels are away from the long keel;

[0040] Removing the nuts at the ends of the second ring keels on both sides of the long keel and removing the two second ring keels;

[0041] Removing the bolts at the connection between the upper half and the lower half or the nuts at the connection between the lower half and the second connecting keel;

[0042] Turning the upper half of the manhole keel or the whole manhole keel around the top end of the long keel until it is away from the surface of the stabilizer.

[0043] As preferably, the method further comprises, before removing the bolts at the connection between the upper half and the lower half or the nuts at the connection between the lower half and the second connecting keel:

[0044] Connecting the lifting device with the third ring keel below the manhole keel;

[0045] Lifting the third ring keel upwards by the lifting device until the shear force on the manhole keel is eliminated.

[0046] As preferably, the longitudinal keel further comprises a short keel, and the S1 comprises:

[0047] Removing the nuts connecting the short keel and the first ring keel;

[0048] Turning the first ring keels on both sides of the short keel around their ends away from the short keel until the first ring keels are away from the short keel;

[0049] Removing the nuts at the ends of the second ring keels on both sides of the short keel and removing the two second ring keels;

[0050] Removing the nuts at the bottom end of the first connecting keel and removing the short keel and the first connecting keel.

[0051] Beneficial effects: the present application provides a partial disassembly method of the heat preservation layer keel frame of the stabilizer, which only partially disassembles one of the plurality of longitudinal keels at a time, inspects the weld at the position, reassembles the partially disassembled longitudinal keel at the position after the inspection, inspects the weld at the position of the next longitudinal keel which has not been inspected, and completes the inspection of all longitudinal keels at least once, thereby completing the inspection of all positions of the weld on the surface of the stabilizer. By the above-mentioned method of partially disassembling one longitudinal keel at a time, the shear force borne by the bolts on the keel during disassembly is still within the design range, thereby ensuring the safety of the operation and avoiding the disassembly of the entire heat preservation layer keel frame, and the disassembly of only a part of the heat preservation layer keel frame can greatly reduce the cost of the inspection, reduce the investment of manpower and material resources, speed up the efficiency of the inspection operation, and reduce the impact on the production capacity of the nuclear power plant. BRIEF DESCRIPTION OF DRAWINGS

[0052] Figure 1 is a front view of the heat preservation layer keel frame and the stabilizer provided by the embodiment of the present application;

[0053] Figure 2 is a flow chart of the partial disassembly of the heat preservation layer keel frame of the stabilizer provided by the embodiment of the present application;

[0054] Figure 3 is a schematic view of the first ring keel away from the long keel provided by the embodiment of the present application;

[0055] Figure 4 is a schematic view of the disassembly of two second ring keels provided by the embodiment of the present application;

[0056] Figure 5 is a schematic view of the abutment of the support disc, the support bolt and the surface of the stabilizer provided by the embodiment of the present application;

[0057] Figure 6 is a schematic view of the rotation of the bottom end of the long keel to drive the first connecting keel around the top end of the long keel to be away from the surface of the stabilizer provided by the embodiment of the present application;

[0058] Figure 7 is a schematic view of the rotation of the upper half of the manhole keel around the top end of the long keel to be away from the surface of the stabilizer provided by the embodiment of the present application;

[0059] Figure 8 is a schematic view of the rotation of the entire manhole keel around the top end of the long keel to be away from the surface of the stabilizer provided by the embodiment of the present application;

[0060] Figure 9 is a schematic view of the disassembly of the short keel provided by the embodiment of the present application.

[0061] In the drawings:

[0062] 100, voltage stabilizer; 101, weld;

[0063] 1, longitudinal keel; 11, long keel; 111, support disc; 112, support bolt; 12, short keel;

[0064] 2, first ring keel;

[0065] 3, second ring keel;

[0066] 4, third ring keel;

[0067] 5, first connecting keel;

[0068] 6, second connecting keel;

[0069] 7, manhole with keel; 71, upper half; 72, lower half. DETAILED DESCRIPTION

[0070] The application will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the application, and not to limit the application. In addition, it should be noted that, for the convenience of description, only the parts related to the application are shown in the drawings, not all the structures.

[0071] In the description of the application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0072] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include the direct contact of the first and second features, or the indirect contact of the first and second features through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include the vertical and oblique above of the first feature to the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include the vertical and oblique below of the first feature to the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0073] In the description of the present embodiment, the terms "upper", "lower", "right", "left", and the like, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0074] Reference Figure 1 The voltage stabilizer 100 is a special equipment, and in order to ensure the safe operation of the equipment, the weld 101 on the surface of the voltage stabilizer 100 is usually subjected to periodic in-service inspection. However, the temperature retaining layer is provided on the side of the voltage stabilizer 100, and when the weld 101 is subjected to in-service inspection, the weld 101 needs to be exposed, so the temperature retaining layer needs to be disassembled. The temperature retaining layer includes a temperature retaining layer skeleton and a plurality of temperature retaining blocks, the temperature retaining layer skeleton is suspended and supported by the top of the voltage stabilizer 100, and the temperature retaining blocks are laid on the surface of the temperature retaining layer skeleton. In the in-service inspection operation, for the weld 101 arranged circumferentially along the surface of the voltage stabilizer 100, the temperature retaining blocks need to be completely disassembled, and then the temperature retaining layer skeleton is disassembled layer by layer from the bottom until the temperature retaining layer skeleton is completely disassembled, so that the circumferential weld 101 is exposed. However, the in-service inspection period is tight, and the complete disassembly and reassembly of the temperature retaining layer consume a large amount of manpower, greatly increase the in-service inspection cost and the number of personnel, and slow down the construction efficiency, affecting the production capacity of the nuclear power plant.

[0075] The temperature retaining layer skeleton cover is arranged on the outer circumferential side of the voltage stabilizer 100, and a plurality of metal reflective type temperature retaining blocks are arranged on the temperature retaining layer skeleton. The metal reflective type temperature retaining blocks and the temperature retaining layer skeleton together form a metal reflective type temperature retaining layer on the outer side of the voltage stabilizer 100, which can keep the temperature around the voltage stabilizer 100 within a relatively stable range, so that the voltage stabilizer 100 can operate safely. The temperature retaining layer skeleton includes a plurality of longitudinal girders 1, a plurality of first circumferential girders 2, and a plurality of second circumferential girders 3. The plurality of longitudinal girders 1 are all in abutment with the surface of the voltage stabilizer 100. One first circumferential girder 2 and one second circumferential girder 3 are arranged between every two longitudinal girders 1. The first circumferential girder 2 is located above the weld 101, and the second circumferential girder 3 is located below the weld 101. Since the longitudinal girders 1 span the horizontal position where the weld 101 is located, the weld 101 at the position of the longitudinal girders 1 cannot be inspected during the in-service inspection operation, and therefore the longitudinal girders 1 need to be partially disassembled for the in-service inspection of the weld 101.

[0076] The technical solutions of the present application will be further described below in conjunction with the drawings and through specific embodiments.

[0077] Reference Figure 2The application provides a partial dismounting method for a heat preservation layer keel frame of a stabilizer, which is used for performing an in-service inspection on a circumferential weld 101 on a surface of the stabilizer 100, and comprises the following steps of:

[0078] S1, one of the plurality of longitudinal keels 1 in the heat preservation layer keel frame is partially dismounted, so that the weld 101 at the position of the longitudinal keel 1 is exposed;

[0079] S2, the weld 101 at the position of the longitudinal keel 1 is inspected and maintained, and then the longitudinal keel 1 is mounted in reverse order;

[0080] S3, the steps of S1-S2 are repeated, and the remaining longitudinal keels 1 are dismounted and mounted until all the longitudinal keels 1 are dismounted and mounted at least once.

[0081] By means of the in-service inspection of partially dismounting one of the longitudinal keels 1 each time, the shearing force borne by the bolts on the longitudinal keel 1 is still within the design range during the dismounting process, the operation safety is ensured, the dismounting of the whole heat preservation layer keel frame is avoided, the cost of the in-service inspection is greatly reduced, the input of manpower and material resources is reduced, the efficiency of the in-service inspection operation is improved, and the influence on the production capacity of the nuclear power plant is reduced.

[0082] Referring to Figure 3 and Figure 4 , the bottom end of the longitudinal keel 1 is connected with a first connecting keel 5, and the longitudinal keel 1 comprises a long keel 11, and the above S1 comprises the following steps of:

[0083] The nut at the connecting position of the long keel 11 and the first circumferential keel 2 is dismounted;

[0084] Two first circumferential keels 2 are respectively rotated away from the end of the long keel 11, until the first circumferential keel 2 is away from the long keel 11;

[0085] The nuts at the two ends of the second circumferential keel 3 on the two sides of the long keel 11 are dismounted, and the two second circumferential keels 3 are dismounted;

[0086] The nut at the bottom end of the first connecting keel 5 is dismounted;

[0087] The bottom end of the long keel 11 drives the first connecting keel 5 to rotate upwards around the top end of the long keel 11 to be away from the surface of the stabilizer 100.

[0088] Specifically, the top ends of the plurality of long girders 11 are connected to each other to form a whole. When one long girder 11 needs to be removed, the other ring girders connected to the long girder 11 near the position of the weld 101 also need to be removed or partially removed to enable the construction personnel to perform relevant inspection on the weld 101 at the position. First, the nuts at the connection between the first ring girder 2 and the long girder 11 are removed, and one end of the first ring girder 2 becomes a free end. Since the upper section of the long girder 11 is bent toward the center of the stabilizer 100, a certain rotation space can be provided for the first ring girder 2. Therefore, to further reduce the disassembly process, the nuts at the other end of the first ring girder 2 are not removed, but the first ring girder 2 is disengaged from the bolts at one end and is rotated around the other end by a lifting device to move the first ring girder 2 away from the long girder 11.

[0089] Similarly, the second ring girder 3 also needs to be removed, but the part of the long girder 11 connected to the second ring girder 3 is vertical and does not bend toward the center of the stabilizer 100, so it cannot provide sufficient rotation space for the second ring girder 3. Therefore, the second ring girder 3 can only be removed, and the nuts on both sides of the second ring girder 3 are removed first, and then the second ring girder 3 is removed.

[0090] The bottom end of the long girder 11 is also connected to the first connecting girder 5. To further expand the construction space for inspection, the nuts at the bottom end of the first connecting girder 5 are removed first, and then the first connecting girder 5 is rotated upward around the top end of the long girder 11 to move away from the surface of the stabilizer 100.

[0091] Specifically, since the long girder 11 is relatively long, when it is rotated around the top end, the bottom end of the long girder 11 will travel a relatively large distance, but the top end of the long girder 11 will not travel a relatively large distance. Therefore, no special treatment is needed for the top end of the long girder 11.

[0092] Reference Figure 5 The side of the long girder 11 close to the stabilizer 100 is provided with a support disc 111 and a support bolt 112, both of which are screwed with the long girder 11 and can abut against the stabilizer 100. The long girder 11 is supported on the surface of the stabilizer 100 by the support disc 111. After the two second ring girders 3 are removed, in order to rotate the bottom end of the long girder 11 with the first connecting girder 5 around the top end of the long girder 11 to move away from the surface of the stabilizer 100, the shear force acting on the bolt of the long girder 11 should be eliminated first. In order to eliminate the force on the long girder 11 as much as possible, the force on the long girder 11 should be dispersed to the support disc 111 on the other long girders 11.

[0093] Specifically, the support disc 111 comprises a support part and a connecting part, the support part and the surface of the stabilizer 100 abut, the connecting part and the long keel 11 are screwed, one end of the support bolt 112 is screwed with the long keel 11, and the other end can abut with the surface of the stabilizer 100. Therefore, the support bolt 112 and the support disc 111 can change the relative position between the long keel 11 and the stabilizer 100 by rotating themselves.

[0094] However, when the support disc 111 also supports the long keel 11, the support disc 111 bears a large force, so that the support disc 111 has a large friction force with the surface of the stabilizer 100, which causes the support disc 111 to be unable to rotate directly when supporting the long keel 11. To solve the above problem, the present application provides a support bolt 112 on the long keel 11, which supports the long keel 11 before rotating the support disc 111, so as to facilitate the subsequent rotation of the support disc 111. Specifically, the support bolt 112 on the long keel 11 is continuously tightened first, so that one end of the support bolt 112 abuts with the surface of the stabilizer 100, and then the support bolt 112 is continuously tightened, so that the support bolt 112 continuously shares the force borne by the support disc 111. With the tightening of the support bolt 112, the support bolt 112 continuously supports until the support disc 111 can rotate. The support disc 111 is rotated away from the surface of the stabilizer 100, and the number of rotations of the support disc 111 is recorded, which facilitates the subsequent reinstallation to ensure that the relative position of the long keel 11 before partial removal remains consistent.

[0095] The number of rotations of the support disc 111 is not limited here. In the present embodiment, the support disc 111 is rotated five times, and in other embodiments, the specific size of the thermal insulation layer keel frame should be determined according to the standard that even if the support bolt 112 is completely loosened, the support disc 111 still cannot bear the gravity of the long keel. After the support disc 111 is rotated in place, the support bolt 112 is continuously loosened, and the long keel 11 falls and gradually approaches the surface of the stabilizer 100 with the loosening of the support nut 14. At this time, the support disc 111 is not stressed, and the shear force of the long keel 11 and the bolts on the long keel 11 is also eliminated.

[0096] After removing two second ring keels 3, the method comprises:

[0097] Loosen the nuts at both ends of the first connecting keel 5;

[0098] Tighten the support bolt 112 to enable the support disc 111 to rotate;

[0099] Rotate the support disc 111 away from the stabilizer 100, so that the support disc 111 does not contact the stabilizer 100 after the support bolt 112 is loosened, and the number of rotations of the support disc 111 is recorded;

[0100] Loosen the support bolt 112 to make the long joist 11 fall to the stabilizer 100 supporting the long joist 11.

[0101] Further, after loosening the support nut 14 to make the long joist 11 fall to the stabilizer 100 supporting the long joist 11, it includes:

[0102] Record the position of the long joist 11 on the surface of the stabilizer 100 at this time.

[0103] During the partial demolition process, the long joist 11 may sway, which will cause the relative position of the long joist 11 before and after disassembly to change relative to the surface of the stabilizer 100. By recording on the surface of the stabilizer 100, it is ensured that the relative position of the long joist 11 before and after disassembly is consistent with the surface of the stabilizer 100, thereby ensuring the safety of the stabilizer 100 joist layer.

[0104] Reference Figure 6 After the above work is completed, the bottom end of the long joist 11 drives the first connecting joist 5 to rotate upward around the top end of the long joist 11 to be away from the surface of the stabilizer 100. Since the long joist 11 has a large mass, a lifting device is usually used to rotate the long joist 11 in actual operation.

[0105] Further, after the bottom end of the long joist 11 drives the first connecting joist 5 to rotate upward around the top end of the long joist 11 to be away from the surface of the stabilizer 100, it includes:

[0106] A positioning member is arranged between the top end of the long joist 11 and the stabilizer 100 to fix the relative position between the long joist 11 and the stabilizer 100, thereby facilitating the inspection of the weld 101 by the construction personnel.

[0107] The type of the positioning member is not limited here and can be a wooden wedge or an iron plate. In the present embodiment, a wooden wedge is used, which has a small mass and can facilitate the operation of the construction personnel and also has a certain buffering effect to avoid damage to the stabilizer 100 or the long joist 11 due to knocking.

[0108] After the weld 101 is inspected by the worker, the long joist 11 needs to be reassembled to restore the long joist 11 to the state of being supported by the support disc 111 on the surface of the stabilizer 100.

[0109] Therefore, the above S2 includes:

[0110] Make the long joist 11 fall to the position recorded on the surface of the stabilizer 100;

[0111] Install the nut at the bottom end of the first connecting joist 5;

[0112] Reassemble the two second ring joists 3 and install the nuts at the two ends of the second ring joists 3 on both sides of the long joist 11.

[0113] Turning the two first ring keels 2 around the end away from the long keel 11, until the free end of the first ring keel 2 can be connected with the long keel 11;

[0114] Installing the nut at the connection between the first ring keel 2 and the long keel 11.

[0115] In order to make the support disc 111 rotate smoothly to the original position according to the previously recorded number of rotation, and avoid the repeated friction between the support disc 111 and the surface of the stabilizer 100, it is necessary to tighten the support bolt 112, and lift the long keel 11 and the support disc 111 to a sufficient rotation space of the support disc 111.

[0116] Specifically, before installing the nut at the bottom end of the first connecting keel 5, it includes:

[0117] Tightening the support bolt 112 to lift the long keel 11 to a sufficient rotation space of the support disc 111;

[0118] According to the recorded number of rotation, reverse rotation of the support disc 111;

[0119] Loosen the support bolt 112 to make the long keel 11 fall to the support disc 111 and the stabilizer 100 abutting and supporting the long keel 11.

[0120] Reference Figure 7 And Figure 8 The manhole keel 7 is set for the daily maintenance of the stabilizer 100, and forms a passageway for the construction personnel to enter and exit, and is fixedly connected with the long keel 11, so when the long keel 11 connected with the manhole keel 7 is partially removed, the manhole keel 7 also needs to be removed.

[0121] The manhole keel 7 includes an upper half 71 and a lower half 72, and the upper half 71 and the lower half 72 are connected by a nut. When the manhole keel 7 is constructed, the upper half 71 of the manhole keel 7 can be removed or the entire manhole keel 7 can be removed according to the construction unit, construction environment, etc. Generally, the difficulty of removing only the upper half 71 of the manhole keel 7 is less than that of removing the entire manhole keel 7.

[0122] Specifically, the stabilizer 100 heat preservation layer keel frame further includes a manhole keel 7 and a third ring keel 4, the manhole keel 7 is connected with the bottom end of the long keel 11, the manhole keel 7 includes an upper half 71 and a lower half 72, the upper end of the upper half 71 is connected with the long keel 11, the lower end is connected with the upper end of the lower half 72, the lower end of the lower half 72 is connected with the third ring keel 4 through the second connecting keel 6, and S1 includes:

[0123] Remove the nut at the joint of the long keel 11 and the first ring keel 2;

[0124] Turn the two first ring keels 2 around their ends away from the long keel 11 respectively to the position that the first ring keel 2 is away from the long keel 11;

[0125] Remove the nut at the joint of the long keel 11 and the first ring keel 2;

[0126] Remove the bolt at the joint of the upper half 71 and the lower half 72 or the nut at the joint of the lower half 72 and the second connecting keel 6;

[0127] Turn the upper half 71 of the manhole keel 7 or the whole of the manhole keel 7 around the top end of the long keel 11 to the position that it is away from the surface of the stabilizer 100.

[0128] Therefore, when the long keel 11 is selected to turn the upper half 71 of the manhole keel 7 around the top end of the long keel 11 to the position that it is away from the surface of the stabilizer 100, the nut at the joint of the upper half 71 of the manhole keel 7 and the lower half 72 of the manhole keel 7 needs to be removed.

[0129] At this time, the upper half 71 of the manhole keel 7 can be separated from the lower half 72 of the manhole keel 7, and the upper half 71 of the manhole keel can move with the long keel 11, and the long keel 11 can turn the upper half 71 of the manhole keel 7 around the top end of the long keel 11 to the position that it is away from the surface of the stabilizer 100.

[0130] When the long keel 11 is selected to turn the whole of the manhole keel 7 around the top end of the long keel 11 to the position that it is away from the surface of the stabilizer 100, the nut at the joint of the bottom end of the manhole keel 7 and the second connecting keel 6 needs to be removed.

[0131] At this time, the whole of the manhole keel 7 can be separated from the second connecting keel 6, and the whole of the manhole keel can move with the long keel 11, and the long keel 11 can turn the whole of the manhole keel 7 around the top end of the long keel 11 to the position that it is away from the surface of the stabilizer 100.

[0132] Specifically, before removing the bolt at the joint of the upper half 71 and the lower half 72 or the nut at the joint of the lower half 72 and the second connecting keel 6, the method comprises:

[0133] Connecting the lifting device with the third ring keel 4 below the manhole keel 7;

[0134] Lifting the third ring keel 4 upward by the lifting device to offset the shear force on the manhole keel 7.

[0135] When the manhole keel 7 is removed, the force acting on the manhole keel 7 also needs to be counteracted, otherwise the threads of the connecting bolts can be damaged or even the bolts can be directly damaged during the removal, thereby causing a chain damage. When the shear force of the bolts on the manhole keel 7 is counteracted, the lifting device needs to be connected to the third ring keel 4 below the manhole, and the third ring keel 4 is lifted upward by the lifting device. When the upward force provided by the lifting device on the third ring keel 4 is equal to the downward force borne by the manhole keel 7, the force of the third ring keel 4 acting on the bolts of the manhole keel 7 can be counteracted to eliminate the shear force on the manhole keel 7. At this time, the removal of the upper half 71 or the whole of the manhole keel 7 can be carried out.

[0136] The specific type of the lifting device is not limited here. In the present embodiment, the lifting device is a hand-operated hoist, which can provide more accurate control and is also convenient for the construction personnel to adjust the force of the hand-operated hoist at any time. In other embodiments, the lifting device can also be an electric hoist or a crane, etc.

[0137] Reference Figure 9 The top of the stabilizer 100 is provided with a plurality of pipes for the entry and exit of the medium inside the stabilizer 100 to keep the pressure inside the stabilizer 100 constant. Therefore, when the longitudinal keel is arranged, the pipes need to be avoided. The top end of the short keel 12 is not connected to the top end of the other long keel 11, but is directly connected to the first ring keel 2 to leave a certain space to avoid the pipes at the top end of the stabilizer 100. Since the top end of the short keel 12 is not connected to the top end of the other long keel 11, the force borne by the short keel 12 is small. Only the first ring keel 2 needs to be rotated and the second ring keel 3 needs to be removed, and finally the nut at the connection between the first connecting keel 5 and the short keel 12 needs to be removed, so that the short keel 12 can be removed.

[0138] The longitudinal keel 1 also includes a short keel 12, and S1 includes:

[0139] The nut connecting the short keel 12 and the first ring keel 2 is removed;

[0140] The first ring keel 2 on both sides of the short keel 12 is rotated around the end away from the short keel 12 until the first ring keel 2 is away from the short keel 12;

[0141] The nuts at both ends of the second ring keel 3 on both sides of the short keel 12 are removed, and the two second ring keels 3 are removed;

[0142] The nut at the bottom end of the first connecting keel 5 is removed, and the short keel 3 and the first connecting keel 5 are removed.

[0143] The application provides a partial dismounting method for a heat preservation layer keel frame of a voltage stabilizer, which only partially dismounts one of a plurality of longitudinal keels 1 at a time, inspects the weld 101 at the position, reassembles the longitudinal keel 1 after the inspection, and then inspects the weld 101 at the position of the next longitudinal keel 1, until all the longitudinal keels 1 are dismounted and assembled at least once, and the weld 101 at all positions on the surface of the voltage stabilizer 100 is inspected. The above-mentioned method of partially dismounting one longitudinal keel 1 at a time ensures that the shearing force borne by the bolts on the keel remains within the design range during the dismounting process, guarantees the safety of the operation, avoids the dismounting of the whole heat preservation layer keel frame, and only dismounts part of the heat preservation layer keel frame, which can greatly reduce the cost of the inspection, reduce the investment of manpower and material resources, speed up the efficiency of the inspection operation, and reduce the influence on the capacity of the nuclear power plant.

[0144] Obviously, the above-mentioned embodiments of the application are only examples for clearly illustrating the application, and are not intended to limit the implementation modes of the application. Those skilled in the art can make various obvious changes, readjustments and substitutions without departing from the protection scope of the application. It is unnecessary and impossible to enumerate all the implementation modes. Any modification, equivalent substitution and improvement within the spirit and principle of the application should be included in the protection scope of the claims of the application.

Claims

1. A method for partially disassembling a heat insulation layer keel frame of a voltage stabilizer, which is used for performing an in-service inspection on a circumferential weld (101) on the surface of a voltage stabilizer (100), the heat insulation layer keel frame comprising a plurality of longitudinal keels (1), a plurality of first circumferential keels (2), and a plurality of second circumferential keels (3), each of the plurality of longitudinal keels (1) is in abutment with the surface of the voltage stabilizer (100), the first circumferential keel (2) and the second circumferential keel (3) are arranged between every two longitudinal keels (1), the first circumferential keel (2) is located above the weld (101), and the second circumferential keel (3) is located below the weld (101), characterized in that, The application relates to a method for disassembling and assembling longitudinal keels in a heat preservation layer longitudinal keel frame. S1, partially disassembling one of the longitudinal keels (1) in the longitudinal keel frame of the heat preservation layer, so that the welding seam (101) at the position of the longitudinal keel (1) is exposed; S2, inspecting the welding seam (101) at the position of the longitudinal keel (1), and then reversely assembling the longitudinal keel (1); S3, repeating S1-S2, and disassembling and assembling the remaining longitudinal keels (1) until all the longitudinal keels (1) are disassembled and assembled at least once. The bottom end of part of the longitudinal keels (1) is connected with a first connecting keel (5), the longitudinal keels (1) comprise a long keel (11), and S1 comprises the following steps: disassembling nuts at the connecting position of the long keel (11) and the first ring keel (2); rotating two first ring keels (2) away from the long keel (11) at the end far away from the long keel (11) until the first ring keel (2) is away from the long keel (11); disassembling nuts at the two ends of the second ring keel (3) on the two sides of the long keel (11), and disassembling the two second ring keels (3); disassembling nuts at the bottom end of the first connecting keel (5); rotating the bottom end of the long keel (11) and the first connecting keel (5) upwards around the top end of the long keel (11) until the first connecting keel (5) is away from the surface of the stabilizer (100).

2. The method according to claim 1, wherein One side of the long keel (11) is provided with a supporting disc (111) and a supporting bolt (112), the supporting disc (111) and the supporting bolt (112) are screwed with the long keel (11), the supporting disc (111) and the supporting bolt (112) can abut against the stabilizer (100), and after the two second ring keels (3) are disassembled, the following steps are included: loosening nuts at the two ends of the first connecting keel (5); tightening the supporting bolt (112) to enable the supporting disc (111) to rotate; rotating the supporting disc (111) to make the supporting disc (111) away from the stabilizer (100) until the supporting disc (111) is not in contact with the stabilizer (100) after the supporting bolt (112) is loosened, and the rotating number of the supporting disc (111) is recorded; loosening the supporting bolt (112) to make the long keel (11) fall to the stabilizer (100) to support the long keel (11).

3. The method according to claim 2, wherein After the long keel (11) falls to the stabilizer (100) to support the long keel (11) after the supporting bolt (112) is loosened, the following steps are included: recording the position of the long keel (11) on the surface of the stabilizer (100) at this time.

4. The partial disassembly method of the regulator thermal protection layer keel frame according to claim 3, characterized in that, The S2 comprises the following steps: making the long keel (11) fall to the position recorded on the surface of the stabilizer (100); adjusting the position of the long keel (11) relative to the stabilizer (100); installing nuts at the bottom end of the first connecting keel (5); assembling the two second ring keels (3) and installing nuts at the two ends of the second ring keel (3) on the two sides of the long keel (11); rotating the two first ring keels (2) away from the long keel (11) at the end far away from the long keel (11) until the free end of the first ring keel (2) can be connected with the long keel (11); installing nuts at the connecting position of the first ring keel (2) and the long keel (11).

5. The method according to claim 4, wherein The adjusting of the position of the long keel (11) relative to the stabilizer (100) comprises the following steps: Tighten the support bolts (112) to raise the long keel (11) to a position where the support disc (111) has enough room to rotate; Rotate the support disk (111) in the reverse direction according to the recorded number of rotations; Loosen the support bolt (112) to allow the long keel (11) to fall to the support disc (111) and abut against the voltage regulator (100) and support the long keel (11).

6. The method according to claim 1, wherein The process of causing the bottom end of the long keel (11) to drive the first connecting keel (5) to rotate upward around the top end of the long keel (11) until it is away from the surface of the voltage regulator (100) includes: A positioning element is provided between the top of the long keel (11) and the voltage regulator (100) to fix the relative position between the long keel (11) and the voltage regulator (100).

7. The method according to claim 1, wherein The insulation layer frame also includes a manhole strip (7) and a third circumferential strip (4). The manhole strip (7) is connected to the bottom end of the long strip (11). The manhole strip (7) includes an upper part (71) and a lower part (72). The upper end of the upper part (71) is connected to the long strip (11), and the lower end is connected to the upper end of the lower part (72). The lower end of the lower part (72) is connected to the third circumferential strip (4) through a second connecting strip (6). S1 includes: Remove the nuts at the connection between the long keel (11) and the first circumferential keel (2); Rotate the two first ring keels (2) around the end of the first ring keel (11) away from the long keel (11) until the first ring keel (2) is away from the long keel (11); Remove the nuts at both ends of the second circumferential keel (3) on both sides of the long keel (11), and remove the two second circumferential keels (3); Remove the bolts connecting the upper half (71) and the lower half (72) or the nuts connecting the lower half (72) and the second connecting keel (6); When the bolts connecting the upper half (71) and the lower half (72) are removed, the long keel (11) causes the upper half (71) of the manhole keel (7) to rotate upward around the top of the long keel (11) and away from the surface of the voltage regulator (100). When the nuts connecting the lower half (72) and the second connecting keel (6) are removed, the long keel (11) causes the entire manhole keel (7) to rotate upward around the top of the long keel (11) and away from the surface of the voltage regulator (100).

8. The partial disassembly method of the regulator thermal protection layer keel frame according to claim 7, characterized in that, Before removing the bolts connecting the upper half (71) and the lower half (72) or the nuts connecting the lower half (72) and the second connecting keel (6), the following steps are included: Connect the lifting device to the third circumferential keel (4) below the manhole belt keel (7); The third circumferential keel (4) is lifted upward by the lifting device to eliminate the shear force on the manhole belt keel (7).

9. The method according to claim 1, wherein, The longitudinal keel (1) further includes a short keel (12), and S1 includes: Remove the nuts connecting the short keel (12) and the first circumferential keel (2); Rotate the first ring keel (2) on both sides of the short keel (12) around the end away from the short keel (12) until the first ring keel (2) is away from the short keel (12); Remove the nuts at both ends of the second circumferential keel (3) on both sides of the short keel (12), and remove the two second circumferential keels (3); Remove the nut at the bottom end of the first connecting keel (5) and remove the short keel (12) and the first connecting keel (5).

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