CN111377355A - Three-web crane beam structure - Google Patents
Three-web crane beam structure Download PDFInfo
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- CN111377355A CN111377355A CN201811624847.1A CN201811624847A CN111377355A CN 111377355 A CN111377355 A CN 111377355A CN 201811624847 A CN201811624847 A CN 201811624847A CN 111377355 A CN111377355 A CN 111377355A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C6/00—Girders, or track-supporting structures, specially adapted for cranes
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Abstract
A crane beam structure with three web plates comprises an I-shaped beam formed by welding an upper flange, a lower flange and a middle web plate and right-angle type abrupt change supports at two ends of the I-shaped beam; the right-angle type mutation support comprises an upper end plate and a lower end plate which are positioned on the end surface of the I-shaped beam; three end webs are arranged between the upper flange and the lower flange at the two ends of the crane beam, the middle parts of the three end webs corresponding to the mutation support seat are arc-shaped, and the upper part of the lower end plate is arc-shaped; a first web connecting plate is welded at the inner side end of the three end webs, two second web connecting plates are symmetrically welded at two sides of the first web connecting plate, and one end of each of the two second web connecting plates is connected to the first web connecting plate; the other ends of the two second web connecting plates are connected with two side surfaces of a middle web of the crane beam; three end reinforcing rib plates are arranged on the outer side surface of the upper end plate, and the upper ends of the three end reinforcing rib plates are respectively connected with the upper flange and the lower end plate. The three-web crane beam structure can greatly prolong the fatigue life and achieve the aim of long-term use, thereby creating conditions for safe production.
Description
Technical Field
The invention relates to a building structure, in particular to a three-web crane beam structure.
Background
A450-ton crane of a certain steel mill has a power-jump fault, and a girder of a factory building for supporting a travelling crane is found to be seriously torn and sunk. When an accident occurs, two 450-ton cranes with full ladles on a raw material span line suspend in half, and one crane is stopped on an accident crane beam which can be deteriorated at any time. Once the crane beam continues to tear, it is likely to cause the 450 tons of crane to derail and slide the raw material span, thereby causing a serious secondary accident of overturning the full-load ladle.
For the 450t service rail beam fracture detection report, it shows: the fracture of the web plate originates from the web plate end part of the boundary of the inserting plate, the crack origin part can be seen as a fatigue crack propagation step, and a tearing dimple and a brittle cleavage crack exist on the fracture. Judging and concluding the fracture property of the web: the fracture property of the web is originated from fatigue, and the web undergoes a fatigue process and finally tears and breaks once.
The variable cross-section stress concentration area and the failure form of the insertion plate type crane beam are different from those of an arc-shaped crane beam, and fatigue cracks originate from the junction of the sealing plate and the insertion plate. Fatigue fracture belongs to brittle failure of materials, the initial failure sign is not obvious, cracks are difficult to find in time by the existing point inspection method, and the difficulty of finding the cracks is increased due to the narrow construction space and the influence of dust deposition on the plane of the inserting plate.
The end part of the arc structure designed originally is cracked, so that when the crane beam is replaced and transformed, the crane beam is limited by the elevation of the shoulder beam of the plant pillar, and the transformed heavy-load large-span crane beam adopts a plug board type variable cross-section form. Under the action of long-term high-cycle reciprocating heavy load, fatigue cracking of the crane beam is caused by stress concentration at the variable cross section. Although the fatigue resistance of the insertion plate type crane beam is improved to a certain extent compared with the arc type crane beam, the variable cross section still has higher stress concentration and smaller stress concentration distribution range, and the existing design specifications do not clearly specify the fatigue calculation of the structural details.
The crane beams in the two forms are rapidly expanded after the service life of the crane beams is subjected to fatigue failure, are difficult to safely control, and cause serious influence on the safe production of steel making.
Disclosure of Invention
The invention aims to design a three-web crane beam structure, which can greatly prolong the fatigue life and achieve the aim of long-term use, thereby creating conditions for safe production.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a crane beam structure with three web plates comprises an I-shaped beam formed by welding an upper flange, a lower flange and a middle web plate and right-angle type abrupt change supports at two ends of the I-shaped beam; the right-angle type mutation support comprises an upper end plate and a lower end plate which are positioned on the end surface of the I-shaped beam; three end webs are arranged between the upper flange and the lower flange at the two ends of the crane beam, the middle parts of the three end webs corresponding to the sudden change support are arc-shaped, and the upper parts of the lower end plates are arc-shaped correspondingly; a first web connecting plate is welded at the inner side end of the three end webs, two second web connecting plates are symmetrically welded at two sides of the first web connecting plate, one end of each of the two second web connecting plates is connected to the first web connecting plate and corresponds to the end webs positioned at two sides of the three end webs; the other ends of the two second web connecting plates are connected with two side surfaces of a middle web of the crane beam to form a closed structure; the outer side face of the upper end plate is provided with three end reinforcing rib plates which respectively correspond to the end webs, and the upper ends of the three end reinforcing rib plates are respectively connected with the upper flange and the lower end plate.
In the structural design of the three-web crane beam, the following components are adopted:
the results of finite element analysis of different dimensions according to the thickness of the lower end plate in the case of the right-angled abrupt support 5 are shown in table 1 below. .
TABLE 1
2) Calculating the variable cross-section arc crane beam:
a28-meter variable-section arc crane beam is selected for finite element analysis and comparison, and the result is shown in Table 2.
Meter 228 m arc type sudden change support crane beam end finite element stress amplitude meter
Note: in the table, S1 is the 1 st main tensile stress, and S2 is the 2 nd main tensile stress.
Finite element stress amplitudes of the end of the 20-meter, 28-meter and 30-meter three-web arc type abrupt change support crane beam are obtained through finite element analysis and calculation, and are shown in table 3.
Finite element stress amplitude of end of crane beam with three webs in table 320, 28 and 30 m and arc type abrupt change support
3) Three web variable cross section right angle formula sudden change crane girders and variable cross section circular arc formula sudden change crane girders compare:
through calculation and analysis of a 28-meter crane beam, the fatigue stress amplitude of the three-web arc and right-angle type mutation support is reduced by about 45% compared with that of a single web, the fatigue stress amplitude of the arc shell plate type mutation support is reduced by about 25% compared with that of the single web, and the stress amplitude is obviously reduced, so that the scheme of the end three-web is mainly compared.
The end condition of the right-angle abrupt change support beam and three webs of the end plate are selected from the finite element analysis results, the thickness of the middle web is 50mm, the thicknesses of the webs on two sides are 32mm, the thickness of the lower end plate is a straight plate and is 70mm, and the stress amplitude is shown in table 4.
Meter 428 m crane beam stress amplitude
| Maximum stress amplitude (N/mm)2) | 0.8 maximum/allowable stress amplitude | 0.9 maximum/allowable stress amplitude |
| 117 | 0.65 | 0.73 |
Under the condition of the end head of the arc-shaped sudden-change support crane beam, the end part has three webs, the middle web of the end part is 50mm, the webs on the two sides are 28mm, and the stress amplitude is shown in table 5.
Stress amplitude of crane beam with 528 meters
The end condition of the arc-shaped abrupt change support crane beam and the shell plates at the ends, the middle web plate of the end is 50mm, the web plates (shell plates) at the ends at two sides are 28mm, and the stress amplitude is shown in table 6.
Table 628 m crane beam stress amplitude
The comprehensive comparison of the right-angle variable cross section, the arc variable cross section and the arc variable cross section shell plate type crane beam is shown in table 7.
TABLE 7 comprehensive comparison table of right-angle and arc variable cross-section
The following results are obtained by comparing the finite element analysis:
(1) the three-web variable-section right-angle crane beam is high in maximum stress amplitude, poor in connection classification according to class 2, obvious stress concentration is caused due to the fact that transverse welding seams (front welding seams) cannot be avoided between the end plates and the inserting plates, practice proves that the three-web variable-section right-angle crane beam is a main cause of fatigue failure, the influence of the three-web variable-section right-angle crane beam on the fatigue resistance of a component cannot be obtained through calculation and analysis, and therefore hidden danger exists if the scheme is selected.
(2) The maximum stress amplitude of the shell plate type crane beam with the variable cross section is highest, and the shell plate type crane beam is not suitable for use.
(3) The three-web variable-section arc crane beam has the lowest maximum stress amplitude. The single-web arc variable-section crane beam designed by Japanese generally has cracks only after being used for about 10 years, and the cracks appear at the web first, so that the cracks are easy to find. According to the invention, the three end webs are adopted to reduce the fatigue stress of the middle main web, the outer webs are supposed to be damaged before the middle webs, and the fatigue service life is theoretically longer than that of a single web. Through strengthening the observation, can in time discover the crackle to in time carrying out the change of crane beam, can guarantee the safety in production.
The invention has the beneficial effects that:
the fatigue stress amplitude of the three-web arc and right-angle type abrupt change support is reduced by about 45 percent compared with that of a single web, and the predicted fatigue life is improved in the same amplitude.
Drawings
FIG. 1 is a front view of an embodiment of the present invention.
Fig. 2 is a sectional view taken along line a-a of fig. 1.
Fig. 3 is a sectional view taken along line B-B of fig. 1.
Fig. 4 is a cross-sectional view taken along line C-C of fig. 1.
Fig. 5 is a cross-sectional view taken along line D-D of fig. 1.
Fig. 6 is a cross-sectional view taken along line E-E of fig. 1.
Detailed Description
Referring to fig. 1 to 6, the crane beam structure with three webs of the present invention includes an i-beam formed by welding upper and lower flanges 11, 12 and a middle web 13, and right angle type abrupt change supports 2, 2' at two ends of the i-beam; the right-angle type abrupt change support 2 (taking the right-angle type abrupt change support 2 as an example, the same below) comprises an upper end plate 21 and a lower end plate 22 which are positioned on the end surface of the I-shaped beam; three end webs 3, 3 ' and 3 ' are arranged between the upper flange 11 and the lower flange 12 at the two ends of the crane beam 1, the middle parts of the three end webs 3, 3 ' and 3 ' corresponding to the mutation supports 2 and 2 ' are arc-shaped, and the upper part of the lower end plate 22 is arc-shaped correspondingly; a first web connecting plate 4 is welded at the inner side end of the three end webs 3, 3 ', two second web connecting plates 5, 5 ' are symmetrically welded at the two sides of the first web connecting plate 4, one ends of the two second web connecting plates 5, 5 ' are connected to the first web connecting plate 4 and are correspondingly positioned at the end webs 3, 3 ' at the two sides in the three end webs 3, 3 '; the other ends of the two second web connecting plates 5 and 5' are connected with two side surfaces of a middle web 13 of the crane beam; the outer side surface of the upper end plate 21 is provided with three end reinforcing rib plates 6, 6 'and 6' which respectively correspond to the end webs 3, 3 'and 3', and the upper ends of the three end reinforcing rib plates 6, 6 'and 6' are respectively connected with the upper flange 11 and the lower end plate 22.
Claims (1)
1. A crane beam structure with three web plates comprises an I-shaped beam formed by welding an upper flange, a lower flange and a middle web plate and right-angle type abrupt change supports at two ends of the I-shaped beam; the right-angle type mutation support comprises an upper end plate and a lower end plate which are positioned on the end surface of the I-shaped beam; the crane beam is characterized in that three end webs are arranged between the upper flange and the lower flange at two ends of the crane beam, the middle parts of the three end webs corresponding to the mutation support are arc-shaped, and the upper parts of the lower end plates are arc-shaped correspondingly; a first web connecting plate is welded at the inner side end of the three end webs, two second web connecting plates are symmetrically welded at two sides of the first web connecting plate, one end of each of the two second web connecting plates is connected to the first web connecting plate and corresponds to the end webs positioned at two sides of the three end webs; the other ends of the two second web connecting plates are connected with two side surfaces of a middle web of the crane beam; the outer side face of the upper end plate is provided with three end reinforcing rib plates which respectively correspond to the end webs, and the upper ends of the three end reinforcing rib plates are respectively connected with the upper flange and the lower end plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811624847.1A CN111377355A (en) | 2018-12-28 | 2018-12-28 | Three-web crane beam structure |
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| CN201811624847.1A CN111377355A (en) | 2018-12-28 | 2018-12-28 | Three-web crane beam structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112320579A (en) * | 2020-10-21 | 2021-02-05 | 中冶建筑研究总院有限公司 | Reinforcement construction method for novel crane beam with right-angle type abrupt change support |
Citations (6)
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| CN203065023U (en) * | 2013-01-23 | 2013-07-17 | 河南江河重工集团有限公司 | Crane, and girder and bridge metal structure thereof |
| CN204823746U (en) * | 2015-08-14 | 2015-12-02 | 中冶赛迪工程技术股份有限公司 | Crane girder tip structure |
| CN106516975A (en) * | 2016-11-10 | 2017-03-22 | 大连理工大学 | Novel bridge crane main beam |
| CN107458963A (en) * | 2017-08-04 | 2017-12-12 | 长春市兴泰起重机械有限公司 | A kind of integrated main girder construction for single girder crane gear |
| CN207061653U (en) * | 2017-04-26 | 2018-03-02 | 北京起重运输机械设计研究院 | A kind of Main Box Beam in Bridge Crane |
| CN207226840U (en) * | 2017-08-04 | 2018-04-13 | 长春市兴泰起重机械有限公司 | A kind of combined type list main beam structure |
-
2018
- 2018-12-28 CN CN201811624847.1A patent/CN111377355A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203065023U (en) * | 2013-01-23 | 2013-07-17 | 河南江河重工集团有限公司 | Crane, and girder and bridge metal structure thereof |
| CN204823746U (en) * | 2015-08-14 | 2015-12-02 | 中冶赛迪工程技术股份有限公司 | Crane girder tip structure |
| CN106516975A (en) * | 2016-11-10 | 2017-03-22 | 大连理工大学 | Novel bridge crane main beam |
| CN207061653U (en) * | 2017-04-26 | 2018-03-02 | 北京起重运输机械设计研究院 | A kind of Main Box Beam in Bridge Crane |
| CN107458963A (en) * | 2017-08-04 | 2017-12-12 | 长春市兴泰起重机械有限公司 | A kind of integrated main girder construction for single girder crane gear |
| CN207226840U (en) * | 2017-08-04 | 2018-04-13 | 长春市兴泰起重机械有限公司 | A kind of combined type list main beam structure |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112320579A (en) * | 2020-10-21 | 2021-02-05 | 中冶建筑研究总院有限公司 | Reinforcement construction method for novel crane beam with right-angle type abrupt change support |
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