CN115319326A - Crack repair method - Google Patents
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- CN115319326A CN115319326A CN202211111936.2A CN202211111936A CN115319326A CN 115319326 A CN115319326 A CN 115319326A CN 202211111936 A CN202211111936 A CN 202211111936A CN 115319326 A CN115319326 A CN 115319326A
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- 238000003466 welding Methods 0.000 claims abstract description 50
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/12—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to investigating the properties, e.g. the weldability, of materials
- B23K31/125—Weld quality monitoring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
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Abstract
The application relates to the technical field of welding maintenance of ship sectional hoisting equipment, in particular to a crack repairing method, which comprises the following steps: the method comprises the following steps that firstly, target rib plates are dismantled, the number of the target rib plates is multiple, the target rib plates are arranged between a rotating disc and an upper box body of hoisting equipment, and the target rib plates are connected with the rotating disc and the upper box body; step two, preprocessing the disassembly position; step three, mounting prefabricated parts, and respectively connecting the prefabricated parts with the rotating disc and the upper box body; the number of the prefabricated parts is multiple, and all target rib plates are replaced by the plurality of prefabricated parts. The crack repairing method can repair cracks appearing at the connecting position between the upper box body and the rotating disc of the equipment, has good repairing quality, and has reference function for overhauling and maintaining related hoisting equipment; a large amount of funds are saved for enterprises, the cost is saved, and the benefit is increased; the potential safety hazard of crane equipment is eliminated, and major safety accidents in the hoisting process are avoided.
Description
Technical Field
The application relates to the technical field of welding maintenance of ship sectional hoisting equipment, in particular to a crack repairing method.
Background
The crane is named as a crane, and the operation of the crane is mainly to finish large segmentation or material movement in the vertical and horizontal directions, so that the material carrying quality is improved in the industrial production and construction processes, the working conditions are improved, and the important role is played in obviously improving the labor productivity. Crane machines are generally of a bulky construction and relatively complex construction, and are capable of performing one lifting movement, one or several horizontal movements. Due to the structural complexity, whether the equipment structure is maintained perfectly or not is very important, and the safe operation of the equipment is determined; in routine maintenance of an equipment crane, cracks are found in a connection area of a gear turntable of the crane and an upper box body, and the fillet weld part of a rib plate connected with the toggle plate and the upper box body has cracks, so that if the cracks are not processed, great potential safety hazards are brought to normal operation of the crane.
Disclosure of Invention
The application aims to provide a crack repairing method, which solves the technical problem of few repairing processes for cracks in the connection area of a gear turntable and an upper box body of a crane in the prior art to a certain extent.
The application provides a crack repairing method, which is used for repairing cracks in a connecting area between a rotating disc and an upper box body of hoisting equipment, and comprises the following steps:
the method comprises the following steps that firstly, target rib plates are dismantled, the number of the target rib plates is multiple, the target rib plates are arranged between a rotating disc of hoisting equipment and an upper box body, and the target rib plates are connected with the rotating disc and the upper box body;
step two, preprocessing the disassembly position;
thirdly, mounting prefabricated parts, and respectively connecting the prefabricated parts with the rotating disc and the upper box body; the number of the prefabricated parts is multiple, and all the target rib plates are replaced by the plurality of the prefabricated parts.
In the above technical solution, further, in the first step, the target rib plates are annularly arranged, and when the target rib plates are disassembled, the same number of target rib plates are disassembled each time according to a symmetrical disassembling manner.
In any of the above technical solutions, further, the following steps are further included between the second step and the third step:
and performing base material inspection on the upper box body and the rotating disc, and installing a plurality of prefabricated parts under the condition that the upper box body and the rotating disc are not damaged.
In any of the above technical solutions, further, the crack repairing method further includes the following steps:
and inspecting the upper box body and/or the rotating disc to have damage defects, and repairing the damaged upper box body and/or the rotating disc.
In any of the above technical solutions, further, after the third step, the method further includes:
and step four, welding quality inspection, wherein flaw detection inspection is carried out on the welding position between the prefabricated part and the upper box body as well as between the prefabricated part and the rotating disc.
In any of the above technical solutions, further, the prefabricated part has a flat plate structure, the prefabricated part is used for being fixed to the bottom of the upper box body, and two ends of the prefabricated part extend towards the edge of the upper box body.
In any of the above technical solutions, further, a first chamfer is formed at one end of the prefabricated component, a second chamfer is formed at the other end of the prefabricated component, and the first chamfer and the second chamfer are located between the prefabricated component and the bottom plate surface of the upper box body in a state that the prefabricated component is located at the bottom of the upper box body.
In any of the above technical solutions, further, the first chamfer and the second chamfer both have an arc-shaped groove structure, and a radius of the arc-shaped groove is 20-28mm.
In any of the above technical solutions, further, the prefabricated part is formed with a slope, the length of the slope extends along the length direction of the prefabricated part, a groove is formed between the slope and the upper box body in a state where the prefabricated part is disposed below the upper box body, the angle of the groove is 45 °, and the depth of the groove is one half of the thickness of the prefabricated part.
In any of the above technical solutions, further, the rotating disc is provided with a fixed member, the upper box body is fixed with the rotating disc through the fixed member, and the prefabricated member is simultaneously connected with the fixed member and the bottom wall surface of the upper box body;
the fixed component is provided with a toggle plate, and part of the prefabricated components are connected with the toggle plate.
Compared with the prior art, the beneficial effect of this application is:
the crack repairing method provided by the application comprises the following steps:
the method comprises the following steps that firstly, target rib plates are dismantled, the number of the target rib plates is multiple, the target rib plates are arranged between a rotating disc and an upper box body of hoisting equipment, and the target rib plates are connected with the rotating disc and the upper box body;
step two, preprocessing the disassembly position;
step three, mounting prefabricated parts, and respectively connecting the prefabricated parts with the rotating disc and the upper box body; the number of the prefabricated parts is multiple, and all target rib plates are replaced by the plurality of prefabricated parts.
The crack repairing method provided by the application can be used for repairing the crack at the connecting position between the upper box body of the equipment and the rotating disc, has good repairing quality, and has reference function for overhauling and maintenance of related hoisting equipment; a large amount of capital is saved for enterprises, the cost is saved, and the benefit is increased; the potential safety hazard of crane equipment is eliminated, and major safety accidents in the hoisting process are avoided.
Drawings
In order to more clearly illustrate the detailed description of the present application or the technical solutions in the prior art, the drawings used in the detailed description or the prior art description will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural diagram of a prefabricated part in a crack repairing method according to an embodiment of the present disclosure;
FIG. 2 is a schematic structural diagram of a prefabricated part in the crack repairing method according to the embodiment of the present application;
FIG. 3 is a schematic diagram illustrating a target component removal or a schematic diagram illustrating a prefabricated component installation in a crack repairing method according to an embodiment of the present application;
fig. 4 is another structural schematic diagram of a prefabricated part in the crack repairing method provided by the embodiment of the application.
Reference numerals: 100-prefabricated part, 1001-first chamfer, 1002-second chamfer, 1003-slope, 1004-back weld and 200-target rib plate.
Detailed Description
The technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present application, but not all embodiments.
The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application.
All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and operate, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present application, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
A crack repairing method according to an embodiment of the present application is described below with reference to fig. 1 to 4.
Referring to fig. 1 to 4, embodiments of the present application provide a crack repairing method, which is particularly used for repairing a weld joint in a connection area between a rotating disc and an upper box of a hoisting device (such as a crane). The crack repairing method comprises the following steps:
s1, dismantling a plurality of target rib plates 200, wherein the target rib plates 200 are arranged between a rotating disc of a hoisting device and an upper box body, and the target rib plates 200 are connected with the rotating disc and the upper box body.
Specifically, a fixing member is arranged on the rotating disk, and the upper box body is fixed on the fixing member, so that the upper box body can rotate synchronously with the rotating disk, the target rib plate 200 and the prefabricated member 100 in this embodiment both play a role in enhancing the connection strength between the upper box body and the rotating disk (fixing member), the upper box body is specifically a control room of a hoisting device, the rotating disk is specifically a gear turntable of the hoisting device, and the specific implementation process of the upper box body being connected with the fixing member so that the upper box body rotates synchronously with the rotating disk is a mature technology in the prior art and is not a key protection content required by this application, which is not described herein in detail.
In step S1, a plurality of target rib plates 200 are distributed in a ring shape, preferably, a plurality of target rib plates 200 are distributed corresponding to the ring structure of the rotating disk, the upper end surface of each target rib plate 200 is connected with the outer plate surface of the bottom wall plate of the upper box body, and when a crack occurs at the connection position between the target rib plate 200 and the bottom wall plate of the upper box body, the stability of the upper box body may be affected, especially during the rotation of the upper box body, and therefore, the weld needs to be repaired.
The original target rib plate 200 is firstly required to be dismantled, the dismantling mode is preferably a cutting or carbon planing mode, then the prefabricated part 100 is replaced, the prefabricated part 100 replaces the original target rib plate 200, and in order to ensure the stability of the center of gravity of the upper box body during rotation, all the target rib plates 200 are dismantled in each repairing process.
The step S1 further comprises the following steps:
and S101, the plurality of target rib plates 200 are annularly arranged, and when the plurality of target rib plates 200 are disassembled, the same number of target rib plates 200 are disassembled each time according to a symmetrical disassembling mode.
Specifically, a plurality of target rib plates 200 are distributed annularly, after one or more target rib plates 200 are dismantled, the target rib plates 200 which are distributed annularly and are symmetrical or opposite to the dismantled position are dismantled first, preferably, the number of the target rib plates 200 dismantled each time is two, then the other two target rib plates 200 in the symmetrical positions are dismantled until the whole replacement and dismantling is completed, preferably, when the prefabricated part 100 is welded, the symmetrical welding mode is also adopted, the dismantling of the target rib plates 200 and the welding sequence of the prefabricated part 100 are symmetrically carried out along the annular (anticlockwise or clockwise), the target rib plates 200 are dismantled each time, the prefabricated part 100 is welded, two blocks of the prefabricated part 100 are welded until the replacement is completed, the stability of the upper box body in the process of dismantling the target rib plates 200 and welding the prefabricated part 100 can be ensured, and the deformation of the box body can be avoided.
S2, preprocessing the disassembly position.
After the target rib plate 200 is removed, an uneven base surface is formed on the bottom wall surface of the upper box body, and the base surface needs to be ground after the target rib plate 200 is removed, and then the prefabricated part 100 is welded to ensure the welding quality.
It should be noted that after two adjacent target rib plates 200 are removed, the base surface is pretreated, and then the target rib plates 200 at the symmetrical positions are removed, so that the probability of omission in the base surface pretreatment is avoided.
S201, base material inspection is carried out on the upper box body and the rotating disc, and the plurality of prefabricated parts 100 are installed under the condition that the upper box body and the rotating disc are not damaged.
Specifically, after the target rib plate 200 is removed, the remaining weld root (base surface) is polished clean, then whether the base metal plate of the upper box bottom plate or the toggle plate connected with the target rib plate 200 before removal has cracks or other defects is checked, and the subsequent operation is executed after whether the upper box or the toggle plate in the current state meets the welding requirements or not is judged.
S202, detecting that the upper box body and/or the rotating disc have damage defects, and repairing the damaged upper box body and/or the damaged rotating disc.
Specifically, after the parent metal of the upper box or the plate of the toggle plate is inspected, if the parent metal is intact, the prefabricated part 100 can be installed, if there is a crack or other defect, the parent metal needs to be repaired, and after the repair is completed, the prefabricated part 100 is installed.
Specifically, the base material repair process comprises the following steps:
(1) Because the upper box body is of a closed structure, a process hole is formed at the minimum stress position of the upper box body for inspection during the repair of the tear of the base material of the bottom wall plate of the upper box body.
(2) The inspection of the tear must be done after the paint is sanded clean.
(3) When the crack area in the box body cannot be found by naked eyes, MT (magnetic particle testing) is required to detect and determine the specific part of the crack.
(4) Before repairing the crack, drilling crack-stopping holes at two ends of the crack, and then repairing the crack.
(5) Crack removal is carried out on the overhead welding position of the bottom wall plate of the upper box body by adopting a carbon arc air gouging, when the depth of the crack is penetrated, the carbon gouging is polished to be 2/3t thick, and then welding is carried out by adopting manual arc welding.
(6) And for the penetrated crack, after the welding at the overhead welding position is finished, performing carbon gouging back chipping at the crack in the box body, and then welding.
(7) After welding was completed for 24 hours, UT (ultrasonic flaw detection) inspection was performed until welding was completed with all cracks removed.
S3, mounting the prefabricated part 100, and respectively connecting the prefabricated part 100 with the rotating disc and the upper box body; the number of the prefabricated parts 100 is plural, and the target rib plates 200 are all replaced by using the plurality of prefabricated parts 100.
After the inspection, in the case that the bottom wall plate (or the toggle plate described below) of the upper case meets the quality requirement, the plurality of prefabricated parts 100 are welded to the bottom wall plate (or the toggle plate described below) of the upper case according to a predetermined rule.
Preferably, the welding mode is manual arc welding, and the welding rod is a basic welding rod, such as the welding rod with the mark of E5015 (J507), which is a low-hydrogen sodium type welding rod and can be used for welding steel structures with larger stress or dynamic load.
More preferably, the bottoming weld joint is welded by a welding rod with the diameter of 3.2mm, and the subsequent weld joint can be welded by a welding rod with the diameter of 3.2mm or 4.0 mm.
And S4, welding quality inspection, wherein flaw detection inspection is carried out on the welding position between the prefabricated part 100 and the upper box body and the rotating disc.
Specifically, after welding is finished for 24 hours, magnetic powder inspection and ultrasonic inspection are carried out on the welding seam or flaw detection is carried out on the welding seam in other modes, the welding seam is ensured not to have slag inclusion, air holes and crack defects, the technical requirements are met, and if the welding seam does not meet the technical requirements, the welding seam needs to be repaired.
It should be emphasized that in this embodiment, compared with the original target rib plate 200, the structural improvement is performed to obtain the prefabricated part 100, so that the connection strength between the prefabricated part 100 and the bottom wall plate of the upper box body or the rib plate described below is stronger, and the welding quality is higher.
In one embodiment of the present application, preferably, the prefabricated part 100 has a flat plate structure, the prefabricated part 100 is used to be fixed to the bottom of the upper case, and both ends of the prefabricated part 100 extend toward the edges of the upper case.
Preferably, one end of the prefabricated part 100 is formed with a first chamfer 1001, the other end of the prefabricated part 100 is formed with a second chamfer 1002, and the first chamfer 1001 and the second chamfer 1002 are located between the prefabricated part 100 and the bottom plate surface of the upper box in a state that the prefabricated part 100 is located at the bottom of the upper box.
In this embodiment, the first chamfer 1001 and the second chamfer 1002 are arc-shaped groove structures formed on the plate structure of the prefabricated part 100, and the first chamfer 1001 and the second chamfer 1002 are used as weld beads when the prefabricated part 100 is welded with the upper box body (and/or the toggle plate), so that the welding area between the prefabricated part 100 and the upper box body (and/or the toggle plate) is increased, and the welding quality is ensured.
Further, since the welding area is narrow and difficult to weld, the prefabricated part 100 and the bottom wall plate of the upper box body need to be fillet welded to ensure the welding strength, the fillet weld formed by fillet welding is specifically formed in the first cut angle 1001 and the second cut angle 1002, preferably, two back-end welds 1004 are formed on the wall surface of the prefabricated part 100 for being attached to the upper box body, namely the upper wall surface of the prefabricated part 100, the back-end welds 1004 are recessed relative to the upper wall surface of the prefabricated part 100, the two back-end welds 1004 are respectively arranged near the first cut angle 1001 and the second cut angle 1002 and are respectively communicated with the first cut angle 1001 and the second cut angle 1002, the back-end welds 1004 are the welds for mainly welding the prefabricated part 100 and the upper box body, and more preferably, the depth of the back-end welds 1004 is greater than 100mm.
In one embodiment of the present application, the first chamfer 1001 and the second chamfer 1002 each preferably have an arcuate slot configuration, the radius of the arcuate slot being 20-28mm.
In this embodiment, the radius R of the arc-shaped groove is preferably 25mm, so that the weld bead has sufficient depth and volume to have sufficient capacity and support capacity to bear the formation of a fillet after the melting of the welding rod, and the depth of the fillet can be ensured to ensure the degree of denseness of the welding position to ensure the welding quality.
In an embodiment of the present application, preferably, the prefabricated part 100 is formed with a slope 1003, a length of the slope 1003 extends along a length direction of the prefabricated part 100, and in a state where the prefabricated part 100 is disposed below the upper box, a bevel is formed between the slope 1003 and the upper box, an angle of the bevel is 45 °, and a depth of the bevel is one half of a thickness of the prefabricated part 100.
In this embodiment, the first chamfer 1001 and the second chamfer 1002 are respectively disposed at two ends of the flat plate structure of the prefabricated component 100 and extend along the width direction of the flat plate structure, the slope 1003 is disposed at a vertex angle of one side of the flat plate structure of the prefabricated component 100, and the vertex angle extending along the length direction of the prefabricated component 100 is cut off, i.e. the prefabricated component 100 is formed with the slope 1003 extending along the length direction thereof, after the prefabricated component 100 is disposed below the upper box body, an included angle is formed between the slope 1003 and the bottom wall plate of the upper box body, i.e. a bevel, preferably, the bevel has an angle of 45 °, i.e. the included angle between the slope 1003 and the bottom wall surface of the upper box body is 45 °, and the opening of the bevel is disposed outward, so as to facilitate welding, preferably, in a state shown in fig. 2 ("T" in fig. 2 represents a plate structure thickness of the prefabricated component 100), the width of a projection of the slope 1003 falling on the bottom wall plate of the upper box body in a direction from bottom to top is half of the width of the prefabricated component 100, such a structure, weakening the plate thickness of the weld seam between the prefabricated component 100 and the slope 1003, and the difficulty of forming the subsequent weld seam 1003 can be reduced, and the risk of the occurrence of the subsequent welding can also be ensured.
In one embodiment of the present application, preferably, the rotating disk is provided with a fixing member, the upper case is fixed with the rotating disk by the fixing member, and the prefabricated part 100 is connected with the fixing member and the bottom wall surface of the upper case at the same time;
the toggle plate is arranged on the fixed member, and a part of the prefabricated members 100 in the plurality of prefabricated members 100 are simultaneously connected with the fixed member and the toggle plate.
In this embodiment, the number of the toggle plates may be one, two or more, and the welding manner of the prefabricated component 100 and the toggle plates and the welding manner of the prefabricated component 100 and the bottom wall plate of the upper box body are fully understood by those skilled in the art and will not be described in detail.
In summary, the crack repairing method provided by the application can repair the crack occurring at the connecting position between the upper box body and the rotating disk of the equipment, has good repairing quality, and has reference function for the overhaul and maintenance of related hoisting equipment; a large amount of funds are saved for enterprises, the cost is saved, and the benefit is increased; the potential safety hazard of crane equipment is eliminated, and major safety accidents in the hoisting process are avoided.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. The crack repairing method is characterized by being used for repairing cracks in a connecting area between a rotating disc and an upper box body of hoisting equipment, and comprises the following steps:
step one, target rib plates are dismantled, wherein the number of the target rib plates is multiple, the multiple target rib plates are arranged between a rotating disc of hoisting equipment and the upper box body, and the target rib plates are connected with the rotating disc and the upper box body;
step two, preprocessing the disassembly position;
thirdly, mounting prefabricated parts, and respectively connecting the prefabricated parts with the rotating disc and the upper box body; the number of the prefabricated parts is multiple, and all the target rib plates are replaced by the plurality of the prefabricated parts.
2. The crack repairing method according to claim 1, wherein in the first step, a plurality of target rib plates are annularly arranged, and when the target rib plates are disassembled, the same number of target rib plates are disassembled each time according to a symmetrical disassembling mode.
3. The crack repair method of claim 1, further comprising, between the second step and the third step, the steps of:
and performing base material inspection on the upper box body and the rotating disc, and installing a plurality of prefabricated parts under the condition that the upper box body and the rotating disc are not damaged.
4. The crack repair method of claim 3, further comprising the steps of:
and inspecting the upper box body and/or the rotating disc to have damage defects, and repairing the damaged upper box body and/or the rotating disc.
5. The crack repair method of claim 1, further comprising, after the third step:
and step four, welding quality inspection, wherein flaw detection inspection is performed on the welding position between the prefabricated part and the upper box body as well as the rotating disc.
6. The crack repairing method according to any one of claims 1 to 5, wherein the prefabricated member has a flat plate structure, the prefabricated member being for fixing to a bottom of the upper case, both ends of the prefabricated member extending toward an edge of the upper case.
7. The crack repairing method according to claim 6, wherein a first chamfer is formed at one end of the prefabricated member, a second chamfer is formed at the other end of the prefabricated member, and the first chamfer and the second chamfer are located between the prefabricated member and a bottom plate surface of the upper case in a state where the prefabricated member is located at the bottom of the upper case.
8. The crack repair method of claim 7, wherein the first chamfer and the second chamfer each have an arcuate slot configuration, the arcuate slot having a radius of 20-28mm.
9. The crack repairing method according to claim 7, wherein the precast member is formed with a slope surface, a length of the slope surface extends in a longitudinal direction of the precast member, and a groove is formed between the slope surface and the upper box body in a state where the precast member is disposed below the upper box body, an angle of the groove is 45 °, and a depth of the groove is one half of a thickness of the precast member.
10. The crack repairing method according to any one of claims 1 to 5, wherein the rotating disk is provided with a fixing member, the upper case is fixed to the rotating disk by the fixing member, and the prefabricated member is connected to both the fixing member and a bottom wall surface of the upper case;
the fixed component is provided with a toggle plate, and part of the prefabricated components are connected with the toggle plate.
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