DE19634570C1 - Device for raising and lowering multi-field components, particularly bridge superstructures - Google Patents

Abstract

A rotation quantity distributor (1) is provided for the oil currents flowing during raising and lowering for distribution in a ratio corresponding to the number of cylinders (4). The distributor incorporates a number of segments (2) corresponding to the number of cylinder groups and is connected between the cylinders and the pump unit. The rotation quantity distributor comprises rotating blade wheel components (3), all of the same diameter, but of widths matching the different throughflow quantities. All the blade wheel components are fixed on a common shaft (10) and always have the same rotary speed.

Description

The invention relates to a method and a device for lifting and lowering of components, e.g. B. Bridge superstructures spanning several fields continuous, static multi-field structures, using a new type of synchronous (synchronous) control.

It is often necessary to build bridges over traffic routes increased to manufacture during the construction of these superstructures To maintain traffic underneath without restrictions. This Excessively manufactured components must then be on the final Height can be lowered. It is also often necessary existing superstructures to be renovated and after completion the renovation.

If the component to be raised or lowered is a construction that runs through several supports, that is, statically a multi-field beam is present, the component must be moved precisely and evenly, otherwise over the supports uncontrollable bending moments arise, which in extreme cases Destruction of the component can result.

The lifting and lowering of components is usually under Using hydraulic cylinders.

Lowering processes are known, in which one over the other individual supports each by a small distance (1-2 cm) is lowered. The component deforms so far that the enlarged bending moment can just be absorbed.

This procedure requires a lot of smaller ones Lowering sections and is very time consuming.

There is no synchronization control. A Central control is usually not used.  

To economically, technically correct components via traffic routes and in the closures that are only possible for a short time via traffic routes raising and lowering times requires a process that meets the following criteria:

• - Lower or raise in large steps up to approx. 1.2 m.
• Control of the cylinders or cylinder groups depending on the path, ie independent of the load,
  → Oil pressure, that is, quantity control of the differently sized oil flows.
• - Absolute synchronization even with more than two support points.

Constant flow dividers are known which have an oil flow in one divide or unite given ratio (publication of Bucher).

Only 2 oil flows are possible.

Because of the additive tolerances of these dividers, it is not possible to connect several of these dividers in series and to achieve sufficient synchronization accuracy.

The invention is based, multi-field components in the task large steps evenly, regardless of the individual to lower or raise existing loads and at the same time to prevent that if a line breaks or of a cylinder the component sinks in an uncontrolled manner.

This object is achieved by the features specified in claims 1 and 5 solved.

In the drawing below, a control scheme for a Multi-field lowering system shown.

It shows:

Fig. 1 position a control scheme for a Mehrfeldabsenkan,

Fig. 2 shows a section along the line A / B in Fig. 1 and

Fig. 3 shows a detail of Fig. 1, which particularly illustrates the pump unit and the directional control valve of Fig. 1.

This is achieved by means of a rotary quantity divider ( 1 ). An essential element of this divider ( 1 ) are rotating paddle wheel elements ( 3 ), for example with a turbine or a gear pump.

Each cylinder group is assigned a segment ( 2 ) of the rotation quantity divider ( 1 ). All segments ( 2 ) have the same inside diameter. The width of the paddle wheel elements ( 3 ) differs in relation to the required oil quantity of the individual, differently sized oil flows to the individual cylinder groups ( 4 ).

The individual rotating paddle wheel elements ( 3 ) of the rotary flow divider ( 1 ) are fixed on a common shaft ( 10 ), so they always rotate at the same speed.

Due to the paddle wheel elements ( 3 ), which have the same diameter but rotate at the same speed but are of different width, an oil flow is always divided or combined with great accuracy in the design ratio.

The rotary flow divider ( 1 ) works in both directions when lifting and lowering structures.

When lifting, the rotary flow divider ( 1 ) is set in rotation by the pump unit ( 5 ) with the directional valve ( 6 ), which is known from the design, via the line (P), and then divides the oil flow through the individual segments ( 2 ) into oil flows which have a constructively predetermined quantity ratio to each other with great partial accuracy.

When lowering, the load to be lowered loads the cylinder groups ( 4 ), which creates an oil pressure in the cylinders.

By actuating the directional valve ( 6 ) on the pump unit ( 5 ), the oil flows through the rotary flow divider ( 1 ) back into the tank of the pump unit ( 5 ).

The oil flows are combined in the specified ratio by the paddle wheel elements ( 3 ).

The load drops evenly with high accuracy.

The control by means of a rotary flow divider ( 1 ) also acts as a hose rupture protection. In the event that a break occurs on a cylinder group ( 4 ) or on a line ( 7 ), that is, oil escapes, the directional control valve ( 6 ) on the pump unit ( 5 ) automatically controls into a position after the control lever on the directional control valve ( 6 ) is released , the line (P) and return (R) to and from the pump unit ( 5 ) closes.

The rotary flow divider ( 1 ) no longer rotates, all oil flows to the cylinder groups ( 4 ) via the lines ( 7 ) are blocked. The entire system is in a safe position.

If the above description is based on a "process" was given, this applies all the more to the relevant Contraption.

Claims (10)

1. Method for the uniform lifting and lowering of multi-field components , in particular bridge superstructures, characterized in that the different loads occurring on the individual support axles are counteracted by a group of cylinders of different sizes, and the oil flows flowing in when lifting or lowering a ratio corresponding to the number of cylinders can be divided or combined. 2. The method according to claim 1, characterized in that the between cylinders and the associated pump set with a Rotational flow divider consisting of one of the number of cylin the number of elements corresponding to the groups is driven. 3. The method according to claim 2, characterized in that for the rotation quantity divider paddle wheel elements with the same Diameters are used, the required different flow rates different widths of the Paddle wheel elements are assigned. 4. The method according to claim 3, characterized in that all Paddle wheel elements firmly seated on the common shaft are always driven at the same speed. 5. A device for lifting and lowering multi-field components, in particular bridge superstructures, characterized in that groups with different numbers of cylinders ( 4 ) are provided for uniformity in this lifting and lowering, and a Rotations tion divider ( 1 ) for the flowing oil flows during lifting and lowering is provided for division in a ratio corresponding to the number of cylinders ( 4 ). 6. The device according to claim 5, characterized in that the flow divider is a rotary flow divider ( 1 ) consisting of one of the number of cylinder groups ( 4 ) corresponding number of these respectively assigned segments ( 2 ) between the Zylin countries ( 4 ) and the Pump unit ( 5 ) is interposed. 7. The device according to claim 6, characterized in that the rotary flow divider ( 1 ) consists of rotating paddle wheel elements ( 3 ), all of the same diameter, but of the widths adjusted under different flow rates. 8. Apparatus according to claim 6 or 7, characterized in that all paddle wheel elements ( 3 ) sit firmly on a common shaft ( 10 ) and always have the same rotational speed. 9. Device according to one of claims 5 to 8, characterized by control of the rotary flow divider ( 1 ) from the pump unit ( 5 ) with directional valve ( 6 ) via a line (P) for dividing the oil flow through the individual segments ( 2 ) in part currents when lifting the multi-field components. 10. The device according to one of claims 5 to 9, characterized by the design of the reusable valve ( 6 ) as a hose rupture fuse with a position of the automatic closing of the flow (P) to and return (R) from the pump unit ( 5 ) and thereby stopping the Rotational flow divider ( 1 ) in the event of oil leakage, for example due to a line break.