EP2197778B1 - Method for setting up respectively dismounting a mobile crane - Google Patents

Description

The invention relates to a method for upgrading or disassembling a mobile crane, comprising a jib arranged at the head of the main boom of the mobile crane, and an auxiliary device for setting up the lower and upper rocking supports connected to the adjustable jib.

• Zunächst wird die untere Wippstütze durch einen Zusatzkran angehoben und auf einer Stange abgestellt. Der Kranbediener muß dann auf dieser angehobenen Wippstütze entlang laufen, um die Anschlagmittel des Zusatzkranes auszuhängen. Diese Tätigkeit ist nicht ungefährlich, weil die Wippstütze in der angehobenen Position sich bis zu 6 m über dem Erdboden befinden kann. Nach diesem Aushängen der Anschlagmittel des Zusatzkranes kann der eigentliche Aufrüstvorgang, den der aufzurichtende Kran ausführt, fortgesetzt werden.

Jibs currently have to be erected by using an additional crane. Looking at the upgrade process, it works as follows:

• First, the lower luffing support is lifted by an additional crane and parked on a pole. The crane operator must then walk along this raised rocker support to unhook the lifting gear of the auxiliary crane. This operation is not without risk, because the rocking support in the raised position can be up to 6 m above the ground. After this detachment of the lifting gear of the auxiliary crane, the actual upgrade process, which is carried out by the crane to be erected, can be continued.

The disassembly must be carried out in the reverse manner, d. H. the lower luffing support is placed on a pole by the crane to be equipped, the crane operator hangs the lifting lugs of the additional crane after hitting the lower luffing support and raises the lower luffing support briefly so that the rod is free. The bar is then guided parallel to the lowering of the lower luffing support by a rope by hand, so that it is deposited together with the lower luffing support back into transport position.

This work therefore requires, on the one hand, an additional crane and, on the other hand, non-hazardous working of the crane operator on the luffing support.

The document US 4,383,616 discloses a method according to the preamble of claim 1.

The object of the invention is therefore to provide a way with which a faster and safe assembly and disassembly of adjustable jibs can be achieved.

This object is achieved according to the invention with the features of claim 1.

Preferably embodiments emerge from the subclaims.

The inventive method will be explained below with reference to the drawings.

In each case, the crane vehicle is shown only schematically in the figures and it will be described below only the parts that are important for understanding the invention.

1. 1 Unterwagen
2. 2 Oberwagen
3. 3 Hauptausleger
4. 4 Adapter für verstellbaren Hilfsausleger (Kopfanschlußstück)
5. 5 verstellbarer Hilfsausleger
6. 6 Aufstellbock
7. 7 Hubseil 1 vom Haupthubwerk
8. 8 untere Wippstütze
9. 9 obere Wippstütze
10. 10 Haupthubwerk
11. 11 Zugkraftgliedstrang
12. 12 Verbindungsstangenstrang

• Figur 1
  Der verstellbare Hilfsausleger 5 wird über einen Adapter 4 an den Kopf des Hauptauslegers 3 angebaut (der Adapter ist für die Erfüllung der Aufgabe nicht zwingend nötig). Der Anbau erfolgt durch geeignetes Hilfsmittel, z. B. Hilfskran oder Stapler. Die beiden Wippstützen 8 und 9 liegen dabei aus Transportgründen flach auf dem Hilfsausleger 5. Das Hubseil 7 wird vom Haupthubwerk 10 des Mobilkranes abgewickelt und mit dem mehrgliedrigen Verbindungsstangenstrang 12 verbunden. Dieser Strang ist dauerhaft mit der unteren Wippstütze 8 verbunden. Beide Wippstützen sind untereinander durch einen Zugkraftgliedstrang 11 verbunden.
• Figur 2
  Durch Aufwickeln des Hubseiles 7 auf das Hubwerk 10 beginnt sich der Aufstellbock 6 selbst aufzurichten, der Verbindungsstangenstrang 12 beginnt sich zunächst rechts vom Aufstellbock 6, dann auch links vom Aufstellbock 6 zu spannen, bis auch die untere Wippstütze 8 angehoben wird.
• Figur 3
  Das Haupthubwerk 10 wickelt weiter auf, der Zugkraftgliedstrang 11 zwischen den Wippstützen 8 und 9 beginnt sich zu spannen. Der Aufstellbock 6 wird in seiner Lage nach hinten durch die Anschlagschrauben am Zurückfallen gehindert.
• Figur 4
  Der Verbindungsstangenstrang 12 ist in seiner Endlage vor dem Haupthubwerk 10 angelangt, die Wippstützen 8 und 9 stehen in Endstellung, der Arbeitsgang ist beendet.
  Das Abrüsten erfolgt in umgekehrter Reihenfolge.
• Figur 5
  Diese Figur zeigt ein Ausführungsbeispiel für den Aufstellbock 6, und zwar besteht dieser aus einer Schweißkonstruktion, die drehbar (schwenkbar) auf der unteren Wippstütze gelagert ist. An den Lagerfüßen sind Anschlagmittel vorgesehen, die ein Umschlagen des Aufstellbockes verhindern. Am oberen Ende des Aufstellbockes befindet sich eine Gabel, in der der vorher beschriebene Verbindungsstangenstrang 12 - wie aus den Figuren 1 bis 4 ersichtlich - abgelegt werden kann.

These parts are labeled with:

1. 1 undercarriage
2. 2 superstructures
3. 3 main boom
4. 4 adapters for adjustable jib (head fitting)
5. 5 adjustable jib
6. 6 stand
7. 7 hoist rope 1 from the main hoist
8. 8 lower rocker support
9. 9 upper rocker support
10. 10 main lift
11. 11 tensile member strand
12. 12 connecting rod strand

• FIG. 1
  The adjustable jib 5 is attached via an adapter 4 to the head of the main boom 3 (the adapter is not absolutely necessary for the fulfillment of the task). The cultivation takes place by suitable aids, z. B. auxiliary crane or forklift. The two rocker supports 8 and 9 are flat for reasons of transport on the jib 5. The hoist rope 7 is unwound from the main hitch 10 of the mobile crane and connected to the multi-link connecting rod strand 12. This strand is permanent with the lower one Wippstütze 8 connected. Both rocker supports are interconnected by a tensile member strand 11.
• FIG. 2
  By winding the hoist rope 7 on the hoist 10, the jack 6 begins to erect itself, the connecting rod 12 begins to stretch to the right of the jack 6, then to the left of the jack 6 until the lower rocker 8 is raised.
• FIG. 3
  The main hitch 10 continues to wind, the tension member strand 11 between the rocker supports 8 and 9 begins to tension. The jack 6 is prevented in its position to the rear by the stop screws on falling back.
• FIG. 4
  The connecting rod strand 12 has arrived in its final position in front of the Haupthubwerk 10, the rocker supports 8 and 9 are in the end position, the operation is completed.
  The disarming takes place in reverse order.
• FIG. 5
  This figure shows an embodiment of the jack 6, and that consists of a welded construction which is rotatably mounted (pivotable) on the lower rocker support. At the bearing feet stop means are provided which prevent a turning of the jack. At the upper end of the jack is a fork, in which the previously described connecting rod strand 12 - as from the FIGS. 1 to 4 visible - can be stored.

The stop screws are used during disassembly also at the same time that the jack 6 is fixed in its position such that the connecting rod strand 12 is taken over the fork shape of the jack 6 again.

This connecting rod strand 12 pulls the Aufstellbock 6 when upgrading the tiltable jib with high until it comes to rest on the stop means. Accordingly, when dismantling the stand 6 by the discharge of the connecting rod strand 12 taken with and in its transport position ( FIG. 1 ) brought.

Claims (8)

1. Method for mounting or demounting a mobile crane, comprising an auxiliary boom (5) arranged on the head of the main boom (3) of the mobile crane, and an auxiliary device for setting up the lower and upper luffing support connected to the adjustable auxiliary boom, wherein

   - a setting-up frame (6) is connected as the auxiliary device to the lower luffing support (8),

   - a connecting rod strand (12) can be connected to the lifting cable (7) of the main lifting gear (10) on the one hand and

   - is articulated on the tip of the lower luffing support (8) on the other hand, and

   - a tensile member strand (11) is provided between the lower luffing support (8) and the upper luffing support (9),

   characterized in that:

   a) during mounting

   - the lifting cable (7) is unwound from the main lifting gear (10) of the mobile crane and connected to the multi-member connecting rod strand (12),

   - by winding the lifting cable (7) onto the lifting gear (10), the setting-up frame (6) begins to draw up automatically, and the connecting rod strand (12) begins to tauten first to the right of the setting-up frame (6), then also to the left of the setting-up frame (6) until the lower luffing support (8) is also raised,

   - the main lifting gear (10) winds up further, and the tensile member strand (11) between the luffing supports (8 and 9) begins to tauten, specifically to a point until

   - the connecting rod strand (12) has reached its end position in front of the main lifting gear (10) and the luffing supports (8 and 9) are in the end position,

   b) during demounting, the preceding steps are performed in the reverse order.
2. Method according to Claim 1, characterized in that the connecting rod strand (12) consists of a plurality of interconnected members.
3. Method according to one of the preceding claims, characterized in that the auxiliary boom (5) is connected to the head of the main boom (3) via an adapter.
4. Method according to one of the preceding claims, characterized in that the lower and the upper luffing supports (8, 9) are laid down flat on the auxiliary boom (5)
5. Method according to one of the preceding claims, characterized in that the multi-member connecting rod strand (12) is permanently connected to the lower luffing support (8).
6. Method according to one of the preceding claims, characterized in that the two luffing supports (8, 9) are permanently connected by the tensile member strand (11).
7. Method according to one of the preceding claims, characterized in that the setting-up frame (6) is permanently connected to the lower luffing support (8).
8. Method according to one of the preceding claims, characterized in that the setting-up frame (6) is pivotably mounted on the lower luffing support (8).

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