EP0307779A1 - Box girder for double girder bridge cranes - Google Patents
Box girder for double girder bridge cranes Download PDFInfo
- Publication number
- EP0307779A1 EP0307779A1 EP88114595A EP88114595A EP0307779A1 EP 0307779 A1 EP0307779 A1 EP 0307779A1 EP 88114595 A EP88114595 A EP 88114595A EP 88114595 A EP88114595 A EP 88114595A EP 0307779 A1 EP0307779 A1 EP 0307779A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- box girder
- web plates
- box
- welds
- profile
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- 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
Definitions
- the invention relates to a box girder for double-girder overhead traveling cranes, consisting of two web plates, which are connected to an upper and lower flange by welds to form a hollow box section.
- girders for bridge cranes It is generally known to design girders for bridge cranes as a hollow box section with a rectangular but also trapezoidal cross section. Top, bottom and web plates are connected by welds. In order to prevent buckling of the web plates under the punctiform load of a running trolley wheel, bulkhead plates are welded into the hollow load profile for stiffening at certain intervals. While the weld seams for connecting the web plates to the upper and lower flange can be carried out mechanically, the bulkhead plate must be welded in by hand. This is a tedious, time-consuming and ultimately ultimately costly activity.
- the invention is therefore based on the object of avoiding bulkhead plates for stiffening hollow box profiles.
- the upper chord consists of a profile with high bending stiffness.
- the weld seam must absorb the entire punctiform load under the trolley wheel, so that the weld seam design is not determined by the shear stress resulting from the bending moment, but solely by the pressure load of the trolley wheel. Due to the rigid profile according to the invention, the point load is converted into a line load, so that the compressive stress is considerably reduced.
- the T-shaped rolled profile is customary and therefore particularly inexpensive, especially when it is an open profile. Closed profiles such as pipes, rectangular pipes and the like are known to be considerably more expensive.
- Another feature of the invention is characterized according to claim 3, characterized in that the two web plates extend obliquely so that they form a trapezoidal shape with the upper and lower flange.
- the trapezoidal box girder profile When loaded from the side, the trapezoidal box girder profile is considerably more torsionally stiff than profiles with parallel web plates, since the top chord must actively participate in the twisting.
- Figure 1 shows a box girder in hollow box construction.
- the box girder consists of the two sloping web plates 1, a lower flange 2 and an upper flange 3 parallel to the lower flange 2.
- the upper flange 3 is designed as a T-shaped commercially available rolled profile. This open rolled profile combines the advantages of high bending stiffness with a low purchase price.
- the upper flange 3 is connected to the web plates 1 by weld seams 4. Due to the high bending stiffness of the top chord 3, the load of a trolley wheel 5 is distributed over a larger area, so that the punctiform loading of the weld seam 4 under the trolley wheel 5 is avoided.
- the lateral guidance can be carried out by rollers 6 which, like the trolley wheel 5, run directly on the upper belt 3.
- the sloping web plates 1 have the advantage that the upper flange 3 according to FIG. 2 participates in the deformation in the event of lateral forces and thus counteracts the deformation with a reaction force.
- the trapezoidal shape assumes the shape shown in broken lines in FIG. It can be seen that the upper flange 3 rotates by the angle ⁇ relative to the undeformed region of the upper flange 3. This results in a Reaction torque of the upper chord 3, which counteracts a deformation by the side force 7 shown with an arrow.
- the trapezoidal shape results in a shape that is particularly rigid against twisting due to lateral forces.
- the box girder according to the invention can also be designed with parallel web plates, which was not explicitly shown.
- a rail 8 can be welded onto the upper flange 3 (FIG. 3).
- Stage attachments 9 or the like are usually to be attached to the box girder. It is advantageous according to FIG. 4 to fasten it to the lower flange 2 by means of a continuous cross bar 10 through first and second weld seams 11 and 12, the weld seams being provided directly under the longitudinal weld seams 13 which connect the lower flange to the web plates 1.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bridges Or Land Bridges (AREA)
- Leg Units, Guards, And Driving Tracks Of Cranes (AREA)
Abstract
Description
Die Erfindung bezieht sich auf einen Kastenträger für Zweiträger-Brückenkrane, bestehend aus zwei Stegblechen, welche mit einem Ober- und Untergurt durch Schweißnähte zu einem Hohlkastenprofil verbunden sind.The invention relates to a box girder for double-girder overhead traveling cranes, consisting of two web plates, which are connected to an upper and lower flange by welds to form a hollow box section.
Es ist allgemein bekannt, Träger für Brückenkrane als Hohlkastenprofil mit rechteckigem aber auch trapezförmigem Querschnitt auszuführen. Ober-, Untergurt und Stegbleche werden durch Schweißnähte verbunden. Um ein Beulen der Stegbleche unter der punktförmigen Last eines laufenden Katzrades zu verhindern, werden in bestimmten Abständen in das Hohlastenprofil Schottblech zur Aussteifung eingeschweißt. Während die Schweißnähte zur Verbindung der Stegbleche mit dem Ober- und Untergurt maschinell ausgeführt werden können, müssen die Schottblech durch Handschweißung eingeschweißt werden. Dies stellt eine mühselige, zeitraubende und damit letztlich kostenträchtige Tätigkeit dar.It is generally known to design girders for bridge cranes as a hollow box section with a rectangular but also trapezoidal cross section. Top, bottom and web plates are connected by welds. In order to prevent buckling of the web plates under the punctiform load of a running trolley wheel, bulkhead plates are welded into the hollow load profile for stiffening at certain intervals. While the weld seams for connecting the web plates to the upper and lower flange can be carried out mechanically, the bulkhead plate must be welded in by hand. This is a tedious, time-consuming and ultimately ultimately costly activity.
Der Erfindung liegt daher die Aufgabe zugrunde, Schottblech zum Aussteifen von Hohlkastenprofilen zu vermeiden.The invention is therefore based on the object of avoiding bulkhead plates for stiffening hollow box profiles.
Gelöst wird diese Aufgabe erfindungsgemäß dadurch, daß der Obergurt aus einem Profil hoher Biegesteifigkeit besteht.This object is achieved according to the invention in that the upper chord consists of a profile with high bending stiffness.
Durch das Profil hoher Biegesteifigkeit verteilt sich die durch ein Katzrad in den Obergurt nahezu punktförmig eingeleitete Last über einen größeren Bereich als Streckenlast, so daß das unter dem Obergurt liegende Stegblech nicht ausgebeult und sich somit Schottblech und Aussteifung erübrigen. Als weiterer Vorteil ist die Entlastung der Schweißnaht zwischen Obergurt und Stegblech zu sehen. Da bei der Fertigung in der Regel zwischen Obergurt und Stegblech ein Spalt vorhanden ist, muß die Schweißnaht die gesamte punktförmige Last unter dem Katzrad aufnehmen, so daß die Auslegung der Schweißnaht nicht durch die aus dem Biegemoment resultierende Schubspannung bestimmt wird, sondern allein durch die Druckbelastung des Katzrades. Durch das erfindungsgemäße, biegesteife Profil wird die Punktlast in eine Streckenlast umgewandelt, so daß die Druckspannung erheblich gemindert wird.Due to the profile of high bending stiffness, the one introduced into the upper chord by a trolley wheel is distributed almost at a point Load over a larger area than line load, so that the web plate underneath the top chord does not bulge and therefore bulkhead plate and stiffening are unnecessary. Another advantage is the relief of the weld between the top flange and the web plate. Since there is usually a gap between the top flange and the web plate during manufacture, the weld seam must absorb the entire punctiform load under the trolley wheel, so that the weld seam design is not determined by the shear stress resulting from the bending moment, but solely by the pressure load of the trolley wheel. Due to the rigid profile according to the invention, the point load is converted into a line load, so that the compressive stress is considerably reduced.
Eine vorteilhafte Ausgestaltung der Erfindung ist nach Anspruch 2 darin zu sehen, daß Profil hoher Biegesteifigkeit ein T-förmiges Walzprofil ist.An advantageous embodiment of the invention can be seen in
Das T-förmige Walzprofil ist handelsüblich und somit besonders preiswert, dies im besonderen, als es sich um ein offenes Profil handelt. Geschlossene Profile wie Rohre, Rechteckrohre und dergleichen sind bekanntlich wesentlich teuerer.The T-shaped rolled profile is customary and therefore particularly inexpensive, especially when it is an open profile. Closed profiles such as pipes, rectangular pipes and the like are known to be considerably more expensive.
Ein weiteres Merkmal der Erfindung zeichnet sind nach Anspruch 3 dadurch aus, daß die beiden Stegbleche schräg verlaufen, so daß sie mit dem Ober- und Untergurt eine Trapezform bilden.Another feature of the invention is characterized according to
Bei seitlicher Belastung ist das trapezförmige Hohlkastenprofil erheblich torsionssteifer als Profile mit parallelen Stegblechen, da der Obergurt an der Verwindung aktiv teilnehmen muß.When loaded from the side, the trapezoidal box girder profile is considerably more torsionally stiff than profiles with parallel web plates, since the top chord must actively participate in the twisting.
Weitere vorteilhafte Ausbildungen des Anspruches 1 können den Unteransprüchen 4 bis 6 entnommen werden.Further advantageous embodiments of claim 1 can be found in the
Ausführungsbeispiele des Kastenträgers sind in Zeichnungen dargestellt. Es zeigen:
- Figur 1 einen Kastenträger mit T-förmigem Obergurt und schrägen Stegblechen, mit Obergurt als Führungsschienen,
Figur 2 ein Kastenträger bei Deformation durch SeitenkraftFigur 3 einen Kastenträger mit T-förmigem Obergurt und schrägen Stegblechen mit Führungsschiene auf dem ObergurtFigur 4 einen trapezförmigen Kastenträger mit an einem Untergurt angeschlossenen Bühnenanbau.
- FIG. 1 shows a box girder with a T-shaped upper chord and sloping web plates, with an upper chord as guide rails,
- Figure 2 shows a box girder when deformed by lateral force
- Figure 3 shows a box girder with a T-shaped top flange and sloping web plates with a guide rail on the top flange
- Figure 4 shows a trapezoidal box girder with stage attachment connected to a lower flange.
Einen Kastenträger in Hohlkastenbauweise stellt Figur 1 dar. Der Kastenträger besteht aus den beiden schräg stehenden Stegblechen 1, einem Untergurt 2 und einen zum Untergurt 2 parallelen Obergurt 3. Der Obergurt 3 ist als T-förmiges handelsübliches Walzprofil ausgebildet. Dieses offene Walzprofil vereinigt die Vorteile hoher Biegesteifigkeit mit niedrigem Kaufpreis. Der Obergurt 3 ist durch Schweißnähte 4 an die Stegbleche 1 angeschlossen. Durch die hohe Biegesteifigkeit des Obergurtes 3 wird die Last eines Katzrades 5 über einen größeren Bereich verteilt, so daß die punktförmige Belastung der Schweißnaht 4 unter dem Katzrad 5 vermieden wird. Die seitliche Führung kann durch Rollen 6 erfolgen, die ebenso wie das Katzrad 5 unmittelbar auf dem Obergurt 3 laufen.Figure 1 shows a box girder in hollow box construction. The box girder consists of the two sloping web plates 1, a
Die schräg stehenden Stegbleche 1 haben den Vorteil, daß bei seitlichen Kräften der Obergurt 3 nach Figur 2 an der Deformation teilnimmt und damit der Deformation eine Reaktionskraft entgegensetzt. Nach der Deformation nimmt die Trapezform die in Figur 2 gestrichelt gezeichnete Form ein. Man erkennt, daß sich der Obergurt 3 um den Winkel α gegenüber dem nicht deformierten Bereich des Obergurtes 3 verdreht. Daraus resultiert ein Reaktionsdrehmoment des Obergurtes 3,das einer Verformung durch die mit Pfeil gezeichneten Seitenkraft 7 entgegenwirkt. Die Trapezform ergibt eine besonders gegen Verwindung durch Seitenkräfte steife Form.The sloping web plates 1 have the advantage that the
Bei geringen Seitenkräften kann der erfindungsgemäße Kastenträger auch mit parallelen Stegblechen ausgeführt werden, was nicht explizit dargestellt wurde.With low lateral forces, the box girder according to the invention can also be designed with parallel web plates, which was not explicitly shown.
Wenn es die Umstände erfordern, kann auf dem Obergurt 3 eine Schiene 8 aufgeschweißt werden (Figur 3).If the circumstances so require, a
Am Kastenträger sind meist Bühnenanbauten 9 oder dergleichen, zu befestigen. Es ist nach Figur 4 vorteilhaft, diese am Untergurt 2 mittels eines durchgehenden Querriegels 10 durch erste und zweite Schweißnähte 11 und 12 zu befestigen, wobei die Schweißnähte unmittelbar unter den Längsschweißnähten 13 vorgesehen sind, welche den Untergurt mit den Stegblechen 1 verbinden.Stage attachments 9 or the like are usually to be attached to the box girder. It is advantageous according to FIG. 4 to fasten it to the
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT88114595T ATE69212T1 (en) | 1987-09-17 | 1988-09-07 | BOX CARRIER FOR DOUBLE GIRDER GOVERNOR CRANES. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3731245A DE3731245C2 (en) | 1987-09-17 | 1987-09-17 | Box girder for a double-girder overhead crane |
DE3731245 | 1987-09-17 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0307779A1 true EP0307779A1 (en) | 1989-03-22 |
EP0307779B1 EP0307779B1 (en) | 1991-11-06 |
Family
ID=6336236
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP88114595A Expired - Lifetime EP0307779B1 (en) | 1987-09-17 | 1988-09-07 | Box girder for double girder bridge cranes |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0307779B1 (en) |
AT (1) | ATE69212T1 (en) |
DE (1) | DE3731245C2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3907116A1 (en) * | 1989-03-06 | 1990-09-13 | Man Ghh Krantechnik | CRANE CHASSIS |
CN102515021A (en) * | 2011-12-06 | 2012-06-27 | 王松江 | Main girder of single-girder crane |
US10479654B2 (en) | 2014-05-26 | 2019-11-19 | Hans Künz GmbH | Crane girder for a crane |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2278814C1 (en) * | 2004-11-22 | 2006-06-27 | Общество с ограниченной ответственностью "Производственная компания "Интека-Кран" | Span beam of bridge and gantry cranes |
DE102012109588A1 (en) | 2012-10-09 | 2014-04-10 | Demag Cranes & Components Gmbh | Crane, in particular overhead crane or gantry crane, with at least one crane girder |
DE102012109586A1 (en) | 2012-10-09 | 2014-04-10 | Demag Cranes & Components Gmbh | Crane, in particular overhead crane or gantry crane, with at least two crane girders |
EP2942317A1 (en) | 2014-05-08 | 2015-11-11 | Helmut Quirxtner | Crane |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1826787U (en) * | 1960-12-19 | 1961-02-16 | Donges Stahlbau G M B H | CRANE BRIDGE CARRIER. |
DE2455968B2 (en) * | 1974-11-27 | 1980-06-26 | Maschinenfabrik Augsburg-Nuernberg Ag, 8500 Nuernberg | Upper chord part under the crane rail of a crane bridge girder or crane runway girder |
DE3016721A1 (en) * | 1979-05-07 | 1980-11-13 | Wiener Brueckenbau | Crane gantry main girder - is of trapezoidal section in two compartments one above another (OE 15.8.80) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1113544B (en) * | 1957-11-25 | 1961-09-07 | Deutschland Ag Maschf | Hollow body support for crane bridges |
DE1107379B (en) * | 1958-08-08 | 1961-05-25 | Demag Ag | Crane girders |
US3241285A (en) * | 1964-05-27 | 1966-03-22 | Int Nickel Co | Structural member for supporting loads |
GB1008983A (en) * | 1964-10-03 | 1965-11-03 | John Barnsley & Sons Ltd | Girders constituting or supporting rails |
DE2508404C2 (en) * | 1975-02-27 | 1982-06-16 | M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8500 Nürnberg | Spatial edge of a fully-walled, welded box girder |
GB1568681A (en) * | 1976-01-13 | 1980-06-04 | Carruthers & Co Ltd J & H | Overhead cranes |
-
1987
- 1987-09-17 DE DE3731245A patent/DE3731245C2/en not_active Expired - Lifetime
-
1988
- 1988-09-07 EP EP88114595A patent/EP0307779B1/en not_active Expired - Lifetime
- 1988-09-07 AT AT88114595T patent/ATE69212T1/en not_active IP Right Cessation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1826787U (en) * | 1960-12-19 | 1961-02-16 | Donges Stahlbau G M B H | CRANE BRIDGE CARRIER. |
DE2455968B2 (en) * | 1974-11-27 | 1980-06-26 | Maschinenfabrik Augsburg-Nuernberg Ag, 8500 Nuernberg | Upper chord part under the crane rail of a crane bridge girder or crane runway girder |
DE3016721A1 (en) * | 1979-05-07 | 1980-11-13 | Wiener Brueckenbau | Crane gantry main girder - is of trapezoidal section in two compartments one above another (OE 15.8.80) |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN, * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3907116A1 (en) * | 1989-03-06 | 1990-09-13 | Man Ghh Krantechnik | CRANE CHASSIS |
CN102515021A (en) * | 2011-12-06 | 2012-06-27 | 王松江 | Main girder of single-girder crane |
US10479654B2 (en) | 2014-05-26 | 2019-11-19 | Hans Künz GmbH | Crane girder for a crane |
Also Published As
Publication number | Publication date |
---|---|
DE3731245C2 (en) | 1994-07-28 |
DE3731245A1 (en) | 1989-03-30 |
EP0307779B1 (en) | 1991-11-06 |
ATE69212T1 (en) | 1991-11-15 |
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