CN103395690A

CN103395690A - Light-weight solid-web I-shaped steel crane girder

Info

Publication number: CN103395690A
Application number: CN2013103613135A
Authority: CN
Inventors: 谢合清
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-08-19
Filing date: 2013-08-19
Publication date: 2013-11-20

Abstract

The invention discloses a light-weight solid-web I-shaped steel crane girder. A track is welded to the upper flange of the solid-web I-shaped steel crane girder, the distance between stiffening ribs is reduced to a range of 0.5 to 0.8 m, thus effective bearing is provided to the composite beam welded on the upper flange by neighbor stiffening ribs, so three-direction complicated stresses of horizontal tension and compression positive stress, vertical shearing force, and wheel pressure partial pressure stress are turned into a two-direction simple stress state without a wheel pressure partial pressure stress, thus the steel using amount in web is reduced; at the same time because the track is welded with the upper flange, the track has a certain upper flange function, and thus the amount of steel used in the upper flange can be correspondingly reduced.

Description

The real abdomen formula of lightweight I-steel crane girder

Technical field

The invention belongs to the crane girder field of steel structure, relate to a kind of real abdomen formula I-shape welded rails steel crane beam.

Background technology

Traditional steel crane beam generally has the real fu jie structure of I-shape (seeing national building standard design atlas 05G514) and truss structure.The crane girder of little tonnage, little span is generally without stop platform or truss, and large-tonnage, large span crane girder need arrange stop platform or stop truss in order to resist the crane horizontal force.

Traditional real abdomen formula I-steel crane girder generally forms I-shaped cross-section by top flange plate, bottom wing listrium and web, on web at a certain distance, being generally 1.5 meters is arranged to vertical ribbed stiffener is kept to not unstability of web, crane girder two ends welding bearing end plate, at the top flange plate middle part, rail is installed, rail is fixed on top flange plate by the fastening rail pressing plate of Gay bolt or welding pressing plate, track vertically only bears the wheel load that crane cart wheel transmits, track passes to the crane girder web after wheel load is disperseed again, finally by the whole crane vertical load of real abdomen H-girder carrying.Real abdomen formula Crane Beam With I span is generally 6 meters, 9 meters, 12 meters or longer, is generally the multiple of 3 meters, and because foundation settlement is inhomogeneous, less employing continous way crane girder, be generally simple beam structure.The crane girder neutral axis is generally compression effort with the upper part cross section, and the following partial cross section of neutral axis is generally tensile stress, and web also will bear shearing and the crane wheel transmits the compression effort of coming.

The web of traditional real abdomen formula I-steel crane girder passes three kinds of stress of local compression effort of coming owing to will bearing moment of flexure normal stress, shearing and wheel load, three kinds of stress stack trailing webs are stressed very complicated, therefore web materials under three kinds of effect of stress are thicker, the 8mm of book, thick reach 20mm more than, the steel using amount of general web accounts for 35% ~ 60% of whole crane girder steel using amount, and web has been a kind of tectonic action in whole crane girder structure, and so high steel using amount is uneconomic.

Rail on traditional real abdomen formula I-steel crane girder only bears and transmits wheel load, to the whole crane beam structural strength without any contribution, cause top flange plate owing to bearing crane vertical load moment of flexure and crane horizontal loading moment of flexure, therefore steel plate used is generally thick than lower flange, also wide than lower flange, materials are also more members.

Summary of the invention

In order to overcome traditional real abdomen formula I-steel crane girder web and the large deficiency of top flange steel using amount, the invention provides a kind of technical scheme that reduces web and top flange steel using amount, is thickness and the width that reduces web thickness and top flange plate under the prerequisite that steel crane beam bulk strength, rigidity, stability and fatigue and component partial strength and stability all meet meeting.

the present invention solve the technical problem the technical scheme that adopts: the ribbed stiffener spacing on real abdomen formula I-steel crane girder web is decreased to 0.5 ~ 0.8m by 1.5 meters, make ribbed stiffener not only have restriction web unstability function, also has rail support point function, be after ribbed stiffener and web combination, to become the supporting-point of track, the sleeper that is equivalent to railway, and ribbed stiffener is become on the web both sides by general paired setting to staggered single face arranges long ribbed stiffener and reverse side arranges short stiffener, make the crane girder web no longer directly bear the local compression effort that wheel load is transmitted, wheel load passes to one group or two groups of ribbed stiffeners by track and top flange composite beam, by ribbed stiffener, reach whole web plate section again, by the welding of track and top flange plate, make rail become one of important primary structure member of steel crane beam, track not only bears wheel load and transmits wheel load, and as a part of Bending positive pressure of H-section top flange.

The invention has the beneficial effects as follows, under the span condition identical with the hoisting crane load, the web of real abdomen formula I-steel crane girder can subtract book to 6 ~ 12mm, can reduce the top flange plate steel using amount by 50% ~ 75% of orbital weight, therefore can significantly reduce steel crane beam weight, reduce the cost of investment of factory building; On the other hand, track and crane girder welding can reduce the rail pressing plate connecting element, also can avoid track in use loosening, reduce the maintenance work amount.

The present invention can be widely used in the medium-and-large-sized hoisting crane crane girder of the industries such as boats and ships, petrochemical industry, mining machinery, electric power, water conservancy, traffic.

The accompanying drawing explanation

Fig. 1 is the real abdomen formula of lightweight I-steel crane girder front view

Fig. 2 is the real abdomen formula of lightweight I-steel crane girder A-A section-drawing

Fig. 3 is the real abdomen formula of lightweight I-steel crane girder B-B section-drawing

Fig. 4 is the real abdomen formula of lightweight I-steel crane girder C-C section-drawing

1. tracks in figure, 2. top flange, 3. web, 4. lower flange, 5. long ribbed stiffener, 6. short stiffener, 7. bearing ribbed stiffener

The specific embodiment

The present invention is described in further detail below in conjunction with drawings and Examples.

Referring to Fig. 1 to Fig. 4, the real abdomen formula of lightweight I-steel crane girder, comprise track 1, top flange 2, web 3, lower flange 4, long ribbed stiffener 5, short stiffener 6, bearing ribbed stiffener 7.it is characterized in that track 1 and top flange 2 weld togethers, the upper limb of web 3 and top flange 2 polish a tight welding, the upper end of long ribbed stiffener 5 and short stiffener 6 polishes and holds out against and top flange 2 welding, lower end is cut and is tiltedly avoided abrupt change of cross-section generation stress to concentrate, favourable prolongation crane girder fatigue life, 50 ~ 100mm is left in long ribbed stiffener 5 lower ends and lower flange 4, the ribbed stiffener spacing is in 0.5 ~ 0.8m, long ribbed stiffener 5 is interspersed in the web both sides with short ribbing 6, the short stiffener 6 of every long ribbed stiffener 5 and reverse side plays the effect of rail support point, be equivalent to the effect of railroad tie, bearing ribbed stiffener 7 is positioned at the crane girder two ends, with top flange 2, web 3 and lower flange 4 welding, on it, be drilled with the bolt hole that crane girder in twos is connected, be illustrated as bead formula seat structure.

because ribbed stiffener spacing on the real abdomen formula of lightweight I-steel crane girder web is less, track 1 and top flange 2 Welding Composite Beam are played to effective supporting, make web 3 by level to tension and compression normal stress, the three-dimensional complicated applied force state reduction of vertical friction stress and local compression effort is that horizontal tension and compression normal stress and vertical friction stress two are to stress, therefore can subtract the book web thickness, simultaneously, due to track 1 and top flange 2 weld togethers, make track 1 become one of crane girder main stress member, with the common Bending pressure in top flange 2, therefore can reduce 2 cross sections, top flange, thereby reduce steel using amount.

After track 1 and top flange 2 welding, reduced rail pressing plate and fixed orifice and avoided drilling fixed orifice and reduced the cross section, top flange.

Above content is in conjunction with concrete preferred implementation further description made for the present invention; can not assert that the specific embodiment of the present invention only limits to this; for the general technical staff of the technical field of the invention; without departing from the inventive concept of the premise; track welding can also be applied on the jib cranes beam; thereby the upper web member welding that is about to track and jib cranes beam makes track become the main stress parts of crane girder, should be considered as belonging to the scope of patent protection that the present invention is determined by claims of submitting to.

Claims

1. the real abdomen formula of lightweight I-steel crane girder, it is characterized in that: track is one of main stress parts of crane girder, ribbed stiffener is the supporting-point of track.

2. the real abdomen formula of lightweight according to claim 1 I-steel crane girder, is characterized in that the top flange welding of track and real abdomen formula I-steel crane girder, saves the auxiliary equipments such as track fixation clip.

3. the real abdomen formula of lightweight according to claim 1 I-steel crane girder, is characterized in that the ribbed stiffener spacing is less, is generally 0.5 ~ 0.8m.

4. the real abdomen formula of lightweight according to claim 1 I-steel crane girder, is characterized in that one group of ribbed stiffener is comprised of long ribbed stiffener and short stiffener, and long ribbed stiffener and short stiffener are interspersed on the web both sides.

5. the real abdomen formula of lightweight according to claim 1 I-steel crane girder, is characterized in that the lower end of long ribbed stiffener and short stiffener is cut oblique.

6. the real abdomen formula of lightweight according to claim 1 I-steel crane girder, is characterized in that web upper limb and top flange polish to hold out against welding, needn't full penetration, reduce welding deformation and welding stress.