CN104084704A - Arch degree control method for large-size solid web superposed beam - Google Patents
Arch degree control method for large-size solid web superposed beam Download PDFInfo
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- CN104084704A CN104084704A CN201410197498.5A CN201410197498A CN104084704A CN 104084704 A CN104084704 A CN 104084704A CN 201410197498 A CN201410197498 A CN 201410197498A CN 104084704 A CN104084704 A CN 104084704A
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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
- B23K31/12—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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- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention belongs to the technical field of arch degree adjustment, and in particular relates to an arch degree control method for a large-size solid web superposed beam. The method comprises the following steps: 1, confirming the arch degree; 2, splicing and welding weld joints of webs; 3, lofting the webs secondarily according to the confirmed arch degree data; 4, respectively pairing two pieces of H-shaped steel of the superposed beam, and welding the weld joints of main corners after the pairing is completed; 5, arranging weld joints of a plurality of reinforcing plates on the beam through welding; 6, overlapping two single beams into one, and partially adjusting the arch degree. Multiple welding processes are adopted, and the arch degree is partially adjusted, so that the arch degree of the beam is maintained in a preset arch degree value, and moreover the arch degree is not changed because of factors such as self-weight, welding and creep deformation.
Description
Technical field
The invention belongs to the camber adjustment technology field of beam, relate in particular to the camber control method of the stacked beam of a kind of Large Real abdomen.
Background technology
Camber at beam is adjusted field, traditional arch camber method has following two kinds: the first, utilize weld seam shrinkage stress manufacture arch, the general shrinkage stress that adopts the method that increases or increase the weld seam of beam lower edge and adjust the welding sequence of upper and lower flange plate and four longitudinal angle weld seams of web to increase lower edge weld seam obtains arch.The second, flame correction method is produced arch, longitudinally bakes a heating tape with flame at the lower flange of girder listrium back side along web, or at the stiffener position, web lower edge district of beam, with roasting several triangular heat districts of flame, heats the bottom wing listrium of corresponding site simultaneously.It is to utilize metal to heat under the condition of restraining, and cooling generation shrinkage stress makes beam obtain camber.
These two kinds of methods, in the former making that compares little large plate-girder arch, it is extensively application, but utilize arch that shrinkage stress produces along with timeliness effect internal stress fades away, arch also disappears and then produces downwarp thereupon, has to adopt various Scheme of Strengthening to recover arch.Flame correction method make beam produce arch uniformity poor, and with heating region size, the thermal treatment zone number relevant, more difficult control.So these two kinds of processes are all undesirable.
Summary of the invention
The object of the invention is to provide for the deficiencies in the prior art the camber control method of the stacked beam of a kind of Large Real abdomen.
For achieving the above object, the present invention adopts following technical scheme: the camber control method of the stacked beam of a kind of Large Real abdomen, and it adopts following steps:
The first step, first calculates lower line of deflection inverse value, the welding deformation value of load and Gravitative Loads underbeam, the camber value of acceptance requirement, then determines camber value;
Second step, web splicing welding joint, according to the layout of web weld seam, first welds the weld seam that amount of contraction is larger, and the less weld seam of rear weldering amount of contraction first welds constraint (restraint) degree compared with weld seam large and can not free shrink, and rear weldering constraint (restraint) degree is compared with weld seam little and can free shrink;
The 3rd step, marks prefabricated Convex curve on web, along cutting out continuous smooth camber curve at the upper lower edge of web;
The 4th step, it is right that two H shaped steel of stoplog are organized respectively, and upper lower edge obtains the beam with arch with the web of camber with upper and lower flange plate assembly welding;
The 5th step by welding, is arranged the weld seam of numerous stiffeners on beam, guarantees that the pre-arch value that the first step is determined is greater than actual arch value;
The 6th step, measures arch after Main Girder Welding, and adjusts in time, and especially using stiffener place as measurement point, two single-beams are stacked to a stacked large plate-girder with camber.
In the first step, the prefabricated arch method of web is all prefabricated arches of lower edge on web, and web is not contour.
In the 4th step, every weld seam first welds leading role's weld seam of lower wing plate and web, and every layer of welding bead welds according to same welding direction, after being soldered, strike slag hand hammer with round end immediately or electronic fullering tool evenly knocks weld metal, make it produce plastic elongation distortion, and offset the local tension that weld seam bears after cooling.
In the 5th step, according to the deformation of beam, adjust length, width and the welding sequence of stiffener, with the distortion of straightening beam to greatest extent.
In the 6th step, if beam has local deformation, use flame straightening, heating-up temperature is 650 ~ 700 DEG C.
Beneficial effect of the present invention: the present invention adopts multiple welding procedure to determine arch, then aspect part employing flame, adjusting camber, make the camber of beam remain on predetermined camber value, and can not cause camber to change because of the factor of welding, because be just to have adopted flame correction method in part, than the region that is easier to control heating.
Detailed description of the invention
A camber control method for the stacked beam of Large Real abdomen, it adopts following steps:
The first step, first calculates lower line of deflection inverse value, the welding deformation value of load and Gravitative Loads underbeam, the camber value of acceptance requirement, then determines camber value;
Second step, web splicing welding joint, according to the layout of web weld seam, first welds the weld seam that amount of contraction is larger, and the less weld seam of rear weldering amount of contraction first welds constraint (restraint) degree compared with weld seam large and can not free shrink, and rear weldering constraint (restraint) degree is compared with weld seam little and can free shrink;
The 3rd step, marks prefabricated Convex curve on web, along cutting out continuous smooth camber curve at the upper lower edge of web;
The 4th step, it is right that two H shaped steel of stoplog are organized respectively, and upper lower edge obtains the beam with arch with the web of camber with upper and lower flange plate assembly welding;
The 5th step by welding, is arranged the weld seam of numerous stiffeners on beam, guarantees that the pre-arch value that the first step is determined is greater than actual arch value;
The 6th step, measures arch after Main Girder Welding, and adjusts in time, and especially using stiffener place as measurement point, two single-beams are stacked to a stacked large plate-girder with camber.
In the first step, the prefabricated arch method of web is all prefabricated arches of lower edge on web, and web is not contour.
In the 4th step, every weld seam first welds leading role's weld seam of lower wing plate and web, and every layer of welding bead welds according to same welding direction, after being soldered, strike slag hand hammer with round end immediately or electronic fullering tool evenly knocks weld metal, make it produce plastic elongation distortion, and offset the local tension that weld seam bears after cooling.
In the 5th step, according to the deformation of beam, adjust length, width and the welding sequence of stiffener, with the distortion of straightening beam to greatest extent.
In the 6th step, if beam has local deformation, use flame straightening, heating-up temperature is 650 ~ 700 DEG C.
The announcement of book and instruction according to the above description, those skilled in the art in the invention can also change and revise above-mentioned embodiment.Therefore, the present invention is not limited to above-mentioned detailed description of the invention, and any apparent improvement, replacement or modification that every those skilled in the art have done on basis of the present invention all belong to protection scope of the present invention.In addition,, although used some specific terms in this description, these terms just for convenience of description, do not form any restriction to the present invention.
Claims (5)
1. a camber control method for the stacked beam of Large Real abdomen, it adopts following steps:
The first step, first calculates lower line of deflection inverse value, the welding deformation value of load and Gravitative Loads underbeam, the camber value of acceptance requirement, then determines camber value;
Second step, web splicing welding joint, according to the layout of web weld seam, first welds the weld seam that amount of contraction is larger, and the less weld seam of rear weldering amount of contraction first welds constraint (restraint) degree compared with weld seam large and can not free shrink, and rear weldering constraint (restraint) degree is compared with weld seam little and can free shrink;
The 3rd step, marks prefabricated Convex curve on web, along cutting out continuous smooth camber curve at the upper lower edge of web;
The 4th step, it is right that two H shaped steel of stoplog are organized respectively, and upper lower edge obtains the beam with arch with the web of camber with upper and lower flange plate assembly welding;
The 5th step by welding, is arranged the weld seam of numerous stiffeners on beam, guarantees that the pre-arch value that the first step is determined is greater than actual arch value;
The 6th step, measures arch after Main Girder Welding, and adjusts in time, and especially using stiffener place as measurement point, two single-beams are stacked to a stacked large plate-girder with camber.
2. the camber control method of the stacked beam of Large Real abdomen according to claim 1, is characterized in that: in the first step, the prefabricated arch method of web is all prefabricated arches of lower edge on web, and web is not contour.
3. the camber control method of the stacked beam of Large Real abdomen according to claim 1, it is characterized in that: in the 4th step, every weld seam first welds leading role's weld seam of lower wing plate and web, and every layer of welding bead welds according to same welding direction, after being soldered, strike slag hand hammer with round end immediately or electronic fullering tool evenly knocks weld metal, make it produce plastic elongation distortion, and offset the local tension that weld seam bears after cooling.
4. the camber control method of the stacked beam of Large Real abdomen according to claim 1, is characterized in that: in the 5th step, according to the deformation of beam, adjust length, width and the welding sequence of stiffener, with the distortion of straightening beam to greatest extent.
5. the camber control method of the stacked beam of Large Real abdomen according to claim 1, is characterized in that: in the 6th step, if beam has local deformation, use flame straightening, heating-up temperature is 650 ~ 700 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410197498.5A CN104084704A (en) | 2014-05-12 | 2014-05-12 | Arch degree control method for large-size solid web superposed beam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410197498.5A CN104084704A (en) | 2014-05-12 | 2014-05-12 | Arch degree control method for large-size solid web superposed beam |
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| CN104084704A true CN104084704A (en) | 2014-10-08 |
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| CN201410197498.5A Pending CN104084704A (en) | 2014-05-12 | 2014-05-12 | Arch degree control method for large-size solid web superposed beam |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109457969A (en) * | 2018-12-19 | 2019-03-12 | 北京首钢建设集团有限公司 | A kind of steel roof joist utilizes the construction method of flame arch camber |
| CN114654173A (en) * | 2022-04-07 | 2022-06-24 | 山东莱钢磁浮列车轨道工程有限公司 | Side-lying assembling method for main beam of movable formwork of bridge girder erection machine |
-
2014
- 2014-05-12 CN CN201410197498.5A patent/CN104084704A/en active Pending
Non-Patent Citations (4)
| Title |
|---|
| 刘文斌: "1 000 MW锅炉钢结构大板梁制作探讨", 《钢结构》 * |
| 周敬松: "叠式大板梁制作技术控制重点", 《钢结构》 * |
| 张强松等: "1000MW机组叠梁的拱度控制与焊接", 《焊接技术》 * |
| 谢忠: "嘉兴电厂2×1 000 MW超临界机组叠梁制作技术", 《钢结构》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109457969A (en) * | 2018-12-19 | 2019-03-12 | 北京首钢建设集团有限公司 | A kind of steel roof joist utilizes the construction method of flame arch camber |
| CN114654173A (en) * | 2022-04-07 | 2022-06-24 | 山东莱钢磁浮列车轨道工程有限公司 | Side-lying assembling method for main beam of movable formwork of bridge girder erection machine |
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Application publication date: 20141008 |
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