CN115948647B - Heat treatment equipment for on-site butt welding seam of U rib of top plate of steel box girder - Google Patents
Heat treatment equipment for on-site butt welding seam of U rib of top plate of steel box girder Download PDFInfo
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- CN115948647B CN115948647B CN202310097411.6A CN202310097411A CN115948647B CN 115948647 B CN115948647 B CN 115948647B CN 202310097411 A CN202310097411 A CN 202310097411A CN 115948647 B CN115948647 B CN 115948647B
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Abstract
The utility model discloses heat treatment equipment for a U-rib on-site butt weld of a top plate of a steel box girder, which comprises a U-rib heating heat insulation structure which is positioned at the bottom of the U-rib and can play a heat insulation effect when carrying out heat treatment on the on-site butt weld of the U-rib, wherein the U-rib heating heat insulation structure comprises a metal shell, electromagnets and metal connecting plates, the front side and the rear side of the bottom of the metal shell are respectively connected with the metal connecting plates for fixing the bottom of the U-rib by spot welding, and electromagnets which can temporarily fix the metal shell at the bottom of a panel above the U-rib are respectively arranged at the left side and the right side above the metal shell. According to the utility model, through the U-rib heating heat-insulating structure and the electric heating sheet and the metal shell, the outer side surface of the electric heating sheet is completely attached to the outer side of the U-rib and the welding corners on the left side and the right side above the U-rib by the flattest and uniform force, so that annealing heat treatment is uniformly performed on the butt welding seam of the U-rib, and the stress is more uniformly eliminated.
Description
Technical Field
The utility model relates to the technical field of heat treatment of steel box girder spliced welds, in particular to heat treatment equipment for a U-rib on-site butt weld of a top plate of a steel box girder.
Background
The orthotropic steel bridge deck structure has become the bridge deck main structural style of the large-span steel bridge because of the dead weight is light, the rigidity is large, there is a large number of welding seams in the traditional orthotropic bridge deck structure, weld deformation is easy to produce, and produce and weld the residual stress in welding seam and heat affected zone, form the weak part of material metallographic structure and mechanics, cause deformation, early fracture, stress corrosion, fatigue fracture and brittle fracture, etc. disease that the steel bridge deck produces while being in service, influence the service life of the structure directly, in order to solve this problem, the technological technology of eliminating the residual stress of orthotropic steel bridge deck through implementing the whole annealing process after welding appears in China, this technology through annealing treatment, reduce the residual stress produced when the board unit is assembled and welded, can reach and reduce the fatigue crack caused by welding the residual stress, lengthen the effect of the fatigue life of orthotropic steel bridge deck;
in the production and processing process of the orthotropic steel bridge deck, the structure is generally divided into sections with a certain length, U rib complementary blocks with a certain length are reserved between adjacent sections and are respectively connected with U ribs of the adjacent sections to realize assembly, and the U rib butt welding seam still has residual stress for eliminating welding;
particularly for the on-site welding seam of the U rib of the top plate, the overhead welding is mostly adopted during on-site welding, and the welding quality is difficult to ensure due to the influence of on-site welding rod parts, and fatigue cracks which are initiated by the welding seam of the bottom plate of the longitudinal rib and extend to the web plate of the longitudinal rib often appear during the service period of the steel bridge, so that the joint welding seam of the longitudinal rib is one of important focusing details of fatigue resistance design and evaluation in actual engineering;
the on-site post-welding heat treatment mechanism for the thermal power plant header connecting pipe fillet weld is disclosed by the authority number CN207176027U, and covers the preset axial length of the alloy steel header cylinder and the area of the outer surface of the alloy steel header cylinder beyond the area of the bottom of the conical fillet weld to be treated within the length range; the second flexible ceramic heater is used for covering the preset axial length of the alloy steel small pipe and the area of the outer surface of the alloy steel small pipe within the length range and the whole conical outer surface of the conical fillet to be treated; the alloy steel collecting box cylinder temperature thermocouple, the conical fillet temperature thermocouple and the alloy steel small pipe temperature thermocouple are respectively arranged on the outer surfaces of the alloy steel collecting box cylinder, the conical fillet to be treated and the alloy steel small pipe; the heat treatment mechanism can obtain the true and accurate temperatures of different parts, effectively heat treat the welding seam and prevent the tube from being over-burned;
in the above-mentioned comparison document, the alloy steel header barrel, the conical fillet and the alloy steel tubule are locally measured by the existing thermocouple, so that the true and accurate temperature of different components in the heat treatment is improved, when the heat treatment is carried out on the outer sides of the alloy steel header barrel, the conical fillet and the alloy steel tubule, the flexible ceramic heater is coated on the outer sides of the alloy steel header barrel, the conical fillet and the alloy steel tubule mainly in a winding way by iron wires, thereby completing the heat treatment of the alloy steel header barrel, the conical fillet and the alloy steel tubule, and two problems exist in the scheme: according to the scheme, the flexible ceramic heater is only coated on the outer surfaces of the alloy steel box cylinder body, the conical fillet and the alloy steel small pipe fitting through the iron wires, after the flexible ceramic heater is wrapped, the heat dissipation speed of the flexible ceramic heater is too high, so that when the heat rising treatment is carried out on the outer sides of the alloy steel box cylinder body, the conical fillet and the alloy steel small pipe, the efficiency is too low, meanwhile, the outer sides of the alloy steel box cylinder body, the conical fillet and the alloy steel small pipe cannot reach the preset high temperature for carrying out the heat treatment, on the other hand, if the flexible ceramic heater is wrapped through the iron wires, the flexible ceramic heater is caused to be attached to the outer surfaces of the alloy steel box cylinder body, the conical fillet and the alloy steel small pipe, so that the uniformity of the heat treatment of each part is difficult to be improved.
Disclosure of Invention
The utility model aims to provide heat treatment equipment for a U-rib on-site butt weld of a top plate of a steel box girder, so as to solve the problem that in the prior art, the stability of local heat treatment operation for a longer on-site splicing weld of the steel box girder is poor.
In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a heat treatment facility to on-spot butt welding of steel case roof U rib, includes that it can play the U rib heating insulation structure of heat preservation effect to its on-spot butt welding department thermal treatment to lie in U rib bottom, U rib heating insulation structure includes metal casing, electro-magnet and metal connecting plate, both sides all are connected with the metal connecting plate that is used for fixing its spot welding U rib bottom around the metal casing bottom, the electro-magnet that can fix the metal casing in U rib top panel bottom temporarily is all installed to metal casing top left and right sides, U rib heating insulation structure left side is connected with the temperature control case that can play the control by temperature change operation to it.
In a further embodiment, the U rib heating insulation structure further comprises electric heating plates attached to the outer surface of the U rib and welding corners on the left side and the right side of the upper portion, thermocouples used for measuring temperature of the outer surface of the U rib during heat treatment are distributed on the inner side face array of the electric heating plates, an insulation layer is coated on the outer side of each electric heating plate, and the insulation layer is located on the inner side face of the metal shell.
In a further embodiment, the electrical heating sheet has the same cross-sectional shape as the U-ribs and the metal housing.
In a further embodiment, the upper part of the electromagnet and the panel at the top of the U-shaped rib are arranged in a suction way.
In a further embodiment, the metal connection plate fixes the metal shell with the U-rib by spot welding.
In a further embodiment, the temperature control box is connected to the U-rib heating insulation structure by wires.
Compared with the prior art, the utility model has the beneficial effects that:
1. according to the utility model, the U-rib heating heat-insulating structure is arranged, and the outer side surface of the electric heating sheet is completely attached to the welding corners on the outer side and the left and right sides above the U-rib by the flattest and uniform force through the electric heating sheet and the metal shell;
2. the utility model is provided with the heat insulation layer and the connecting plate, the electric heating plate and the U rib which are heated up can be placed with the heat insulation layer to emit temperature in the heat treatment process, the effect of heat insulation and temperature locking is achieved, the problem that the electromagnet is difficult to fix the U rib heating heat insulation structure outside the U rib due to the fact that the magnetism is invalid due to the fact that the temperature is increased and the magnetism is reduced in the annealing process is avoided by the temporary fixing mode of spot welding of the connecting plate and the bottom of the U rib, the reliable stability of the equipment in the use process is achieved, meanwhile, the effect of convenient disassembly of operators after the heat treatment of the U rib at the position is finished is achieved, and compared with the prior art, the equipment can achieve the local annealing treatment of the U rib on-site butt welding seam of the steel box girder bridge more conveniently, and the overall stability and convenience are improved.
Drawings
FIG. 1 is a schematic view of a heat treatment apparatus for a steel box girder roof U-rib field butt weld according to a preferred embodiment of the present utility model;
FIG. 2 is a schematic view of the mounting structure of the electromagnet and the metal housing shown in FIG. 1;
fig. 3 is a schematic view of the installation structure of the insulating layer and the electric heating sheet shown in fig. 1.
In the figure: 1. u-rib heating insulation structure; 11. an electric heating plate; 12. a thermocouple; 13. a heat preservation layer; 14. a metal housing; 15. an electromagnet; 16. a metal connecting plate; 2. a temperature control box; 21. and (5) conducting wires.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1-3, an embodiment of the present utility model is provided: the utility model provides a heat treatment facility to on-spot butt welding of steel case roof U rib, including U rib heating insulation structure 1, the electrical heating plate 11, thermocouple 12, heat preservation 13, metal casing 14, electro-magnet 15, metal connecting plate 16, temperature control box 2 and wire 21, U rib heating insulation structure 1 that is located U rib bottom and plays the heat preservation effect when can carrying out on-spot butt welding department thermal treatment, U rib heating insulation structure 1 includes metal casing 14, electro-magnet 15 and metal connecting plate 16, both sides all are connected with the metal connecting plate 16 that is used for fixing U rib bottom with its spot welding around the metal casing 14 bottom, the electro-magnet 15 that can temporarily fix U rib top panel bottom to metal casing 14 is all installed to metal casing 14 top left and right sides, U rib heating insulation structure 1 left side is connected with the temperature control box 2 that can play the control operation to it.
Examples
Referring to fig. 1-3, the U-rib heating insulation structure 1 further comprises an electric heating sheet 11 attached to the outer surface of the U-rib and welding corners on the left and right sides above the outer surface of the U-rib, thermocouples 12 for measuring temperature of the outer surface of the U-rib during heat treatment are distributed on the inner side surface array of the electric heating sheet 11, an insulation layer 13 is coated on the outer side of the electric heating sheet 11, the insulation layer 13 is positioned on the inner side surface of the metal shell 14, the section of the electric heating sheet 11 is identical to the section of the U-rib and the section of the metal shell 14, the upper side of the electromagnet 15 is in suction arrangement with a panel on the top of the U-rib, the metal connecting plate 16 fixes the metal shell 14 and the U-rib through spot welding, the temperature control box 2 is connected with the U-rib heating insulation structure 1 through a wire 21, first heat treatment equipment with corresponding dimensions is selected for the U-rib heating insulation structure 1 and the metal shell 14 are installed on the outer side below the U-rib, then the upper part of the electromagnet 15 and the panel above the U-shaped rib are attracted to be temporarily fixed under the condition that magnetism is generated by electrifying through the electromagnet 15, as the U-shaped rib heating insulation structure 1 is mainly assembled by the electric heating sheet 11, the thermocouple 12, the insulation layer 13, the metal shell 14, the electromagnet 15 and the metal connecting plate 16, the insulation layer 13 is arranged at the inner side of the metal shell 14, the electric heating sheet 11 is connected at the outer side of the insulation layer 13, the thermocouples 12 are distributed on the outer side of the electric heating sheet 11 in an array manner, the electric heating sheet 11 is attached to the outer side of the U-shaped rib and the welding corners at the left side and the right side of the upper part, in addition, the upper ends of the two sides of the metal connecting plate 16 at the front side and the rear side of the bottom of the metal shell 14 are fixedly connected with the bottom of the U-shaped rib in a spot welding manner, then the electric heating sheet 11 is heated to a preset temperature by the temperature control box 2 matched with the lead 21, the heated temperature is insulated by the insulation layer 13, the setting of the structure is tracked and monitored through thermocouple 12, compare in the contrast file among the background art, can be through the outer side of electrical heating plate 11 with the most smooth and even power laminate completely in U rib outside and the welding angle of top left and right sides, thereby reached evenly carry out annealing heat treatment to U rib butt welding seam, thereby the stress has been more even eliminated, in addition, can also play the effect of heat preservation lock temperature to the electrical heating plate 11 and the U rib that heat up through heat preservation 13, the local annealing treatment to steel box girder bridge U rib spot butt welding seam of realization that this equipment can be convenient simultaneously, through the temporary fixation mode of connecting plate and U rib bottom spot welding, the shortcoming that magnet 15 is because of the ferromagnetism decline of rising in the annealing in-process, the magnetic failure is led to has been compensatied to the electro-magnet 15, the reliable fixation of device in the use has been realized.
Working principle: as shown in fig. 1-3, the heat treatment equipment with corresponding size is selected for different types of U ribs, then the U rib heating and heat insulation structure 1 and the metal shell 14 are installed on the outer side below the U ribs, then the upper part of the electromagnet 15 and the panel above the U ribs are temporarily fixed under the condition that magnetism is generated by electrifying through the electromagnet 15, because the U rib heating and heat insulation structure 1 is mainly assembled by the electric heating plate 11, the thermocouple 12, the heat insulation layer 13, the metal shell 14, the electromagnet 15 and the metal connecting plate 16, the heat insulation layer 13 is arranged on the inner side of the metal shell 14, the electric heating plate 11 is connected on the outer side of the heat insulation layer 13, thermocouples 12 are distributed on the outer side of the electric heating plate 11 in an array manner, the electric heating plate 11 is attached to the outer side of the U ribs and welded corners on the left side and the right side of the upper part of the metal connecting plate 16 on the front side and the rear side of the bottom of the metal shell 14 and the bottom of the U ribs are fixedly connected in a spot welding mode, the electric heating plate 11 is heated to a preset temperature by the temperature control box 2 matched with the lead 21, the heated temperature is insulated by the heat preservation layer 13, the annealing temperature is tracked and monitored by the thermocouple 12, compared with the comparison document in the background art, the arrangement of the structure can be completely attached to the outer side of the U rib and the welding corners on the left and right sides above the U rib by the flattest and uniform force on the outer side of the electric heating plate 11, thereby achieving uniform annealing heat treatment on the U rib butt welding seam, further eliminating the stress more uniformly, and in addition, the device can also achieve the effect of heat preservation and temperature locking on the heated electric heating plate 11 and the U rib by the heat preservation layer 13, meanwhile, the device can conveniently realize the local annealing treatment on the U rib spot butt welding seam of the steel box girder bridge, and the temporary fixing mode of spot welding of the connecting plate and the U rib bottom is adopted, the defect that the electromagnet 15 is magnetic failure due to the fact that the temperature rises and the ferromagnetism falls in the annealing process is overcome, the reliable fixing of the device in the using process is achieved, and therefore a series of work is completed.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (2)
1. The heat treatment equipment for the U-rib on-site butt welding seam of the steel box girder top plate comprises a U-rib heating heat preservation structure (1) which is positioned at the bottom of the U-rib and can play a heat preservation effect when performing heat treatment on the on-site butt welding seam, wherein the U-rib heating heat preservation structure (1) comprises a metal shell (14), electromagnets (15) and metal connecting plates (16), the front side and the rear side of the bottom of the metal shell (14) are respectively connected with the metal connecting plates (16) for fixing the bottom of the U-rib by spot welding, electromagnets (15) which can temporarily fix the metal shell (14) at the bottom of a panel above the U-rib are respectively arranged at the left side and the right side of the top of the metal shell (14), and a temperature control box (2) which can play a role in temperature control operation is connected to the left side of the U-rib heating heat preservation structure (1);
the U-rib heating heat-insulating structure (1) further comprises electric heating plates (11) attached to the outer surface of the U-rib and welding corners on the left side and the right side above the U-rib, thermocouples (12) which are used for measuring temperature of the outer surface of the U-rib during heat treatment are distributed on the inner side surface of the electric heating plates (11), a heat-insulating layer (13) is coated on the outer side of the electric heating plates (11), and the heat-insulating layer (13) is located on the inner side surface of the metal shell (14);
the upper part of the electromagnet (15) is in suction arrangement with a panel at the top of the U-shaped rib, and the metal connecting plate (16) fixes the metal shell (14) and the U-shaped rib through spot welding;
the electric heating plate (11) has the same cross-sectional shape as the U-ribs and the metal shell (14).
2. A heat treatment apparatus for steel box girder top plate U-rib field butt welds according to claim 1, characterized in that: the temperature control box (2) is connected with the U-rib heating and heat-preserving structure (1) through a lead (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310097411.6A CN115948647B (en) | 2023-02-10 | 2023-02-10 | Heat treatment equipment for on-site butt welding seam of U rib of top plate of steel box girder |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310097411.6A CN115948647B (en) | 2023-02-10 | 2023-02-10 | Heat treatment equipment for on-site butt welding seam of U rib of top plate of steel box girder |
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| CN115948647A CN115948647A (en) | 2023-04-11 |
| CN115948647B true CN115948647B (en) | 2023-07-18 |
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