EP0307779A1 - Box girder for double girder bridge cranes - Google Patents

Box girder for double girder bridge cranes Download PDF

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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
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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
Application number
EP88114595A
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German (de)
French (fr)
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EP0307779B1 (en
Inventor
Gerhard Dr.-Ing. Wagner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
*KCI KONECRANES PLCKONEENKATU 8, FIN-05830 HYVINKAEAE
Konecranes PLC
Original Assignee
MAN GHH Krantechnik GmbH
MAN GHH Logistics GmbH
Priority date (The priority date 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 date listed.)
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Publication date
Application filed by MAN GHH Krantechnik GmbH, MAN GHH Logistics GmbH filed Critical MAN GHH Krantechnik GmbH
Priority to AT88114595T priority Critical patent/ATE69212T1/en
Publication of EP0307779A1 publication Critical patent/EP0307779A1/en
Application granted granted Critical
Publication of EP0307779B1 publication Critical patent/EP0307779B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

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.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bridges Or Land Bridges (AREA)
  • Leg Units, Guards, And Driving Tracks Of Cranes (AREA)

Abstract

Box girders for double-girder bridge cranes are subjected to high compressive loading under the trolley wheel. This especially applies to the welds which connect the top chord (3) to the web plates (1). To relieve these welds, the top chord is formed from a rigid section, for example a T-shaped rolled section. To increase the torsional rigidity, the side plates can be at an angle so that a trapezoidal cross-section of the hollow-box section results. <IMAGE>

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 claim 2 in that the profile with high bending stiffness is a T-shaped rolled profile.

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 claim 3, characterized in that the two web plates extend obliquely so that they form a trapezoidal shape with the upper and lower flange.

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 subclaims 4 to 6.

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 Seitenkraft
  • Figur 3 einen Kastenträger mit T-förmigem Obergurt und schrägen Stegblechen mit Führungsschiene auf dem Obergurt
  • Figur 4 einen trapezförmigen Kastenträger mit an einem Untergurt angeschlossenen Bühnenanbau.
Embodiments of the box girder are shown in drawings. Show it:
  • 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 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.

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 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. After the deformation, 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 α 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.

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 rail 8 can be welded onto the upper flange 3 (FIG. 3).

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 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.

Claims (6)

1. Kastenträger für Zweiträger-Brückenkrane, bestehend aus zwei Stegblechen, welche mit einem Ober- und Untergurt durch Schweißnähte zu einem Hohlkastenprofil verbunden sind, dadurch gekennzeichnet, daß der Obergurt (3) aus einem Profil hoher Biegesteifigkeit besteht.1. box girder for double-girder overhead traveling cranes, consisting of two web plates, which are connected to an upper and lower chord by welds to form a hollow box section, characterized in that the upper chord (3) consists of a profile with high bending rigidity. 2. Kastenträger nach Anspruch 1, dadurch gekennzeichnet, daß das Profil hoher Biegesteifigkeit ein T-förmiges Walzprofil ist.2. Box girder according to claim 1, characterized in that the profile of high bending rigidity is a T-shaped rolled profile. 3. Kastenträger nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß die beiden Stegbleche (1) schräg verlaufen, so daß sie mit dem Ober- und Untergurt (3 und 2) eine Trapezform bilden.3. box girder according to claims 1 and 2, characterized in that the two web plates (1) run obliquely so that they form a trapezoidal shape with the upper and lower flange (3 and 2). 4. Kastenträger nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß die beiden Stegbleche (1) parallel verlaufen.4. box girder according to claims 1 and 2, characterized in that the two web plates (1) run parallel. 5. Kastenträger nach den Ansprüchen 1 bis 4, dadurch gekennzeichnet, daß der Obergurt (3) Laufbahn für ein Katzrad (5) ist und zugleich der Seitenführung durch Rollen (6) dient.5. box girder according to claims 1 to 4, characterized in that the upper flange (3) is a track for a trolley wheel (5) and at the same time serves the lateral guidance by rollers (6). 6. Kastenträger nach den Ansprüchen 1 bis 5, dadurch gekennzeichnet, daß am Kastenträger Bühnenanbauten (9) oder dergleichen mit einem Querriegel (10) durch kurze Schweißnähte (11 und 12) unmittelbar unter den Schweißnähten (13) der Stegbleche (1) an den Untergurt (2) angeschlossen werden.6. box girder according to claims 1 to 5, characterized in that on the box girder stage extensions (9) or the like with a cross bar (10) by short welds (11 and 12) directly below the welds (13) of the web plates (1) to the Lower flange (2) can be connected.
EP88114595A 1987-09-17 1988-09-07 Box girder for double girder bridge cranes Expired - Lifetime EP0307779B1 (en)

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

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EP88114595A Expired - Lifetime EP0307779B1 (en) 1987-09-17 1988-09-07 Box girder for double girder bridge cranes

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EP (1) EP0307779B1 (en)
AT (1) ATE69212T1 (en)
DE (1) DE3731245C2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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)

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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)

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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

Patent Citations (3)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, *

Cited By (3)

* Cited by examiner, † Cited by third party
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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