Pile hammer

Abstract

A pile hammer includes a cylinder, a piston displaceably guided in the cylinder, a striker displaceably guided in the cylinder and disposed underneath the piston in the operating position of the pile hammer, a combustion chamber delimited axially by a face surface of the striker that lies in the interior of the cylinder and by a face surface of the piston, as well as a disengagement apparatus by way of which the piston can be moved in the cylinder, into an upper position, wherein the disengagement apparatus includes a carriage, which is connected with at least one cable, by way of which the carriage is guided to be displaceable on the outside, along the cylinder, wherein a stop that projects outward is disposed on the cylinder and a buffer part is disposed on the carriage, with which part the carriage lies against the stop in an upper end position.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]Applicant claims priority under 35 U.S.C. §119 of European Application No. 14184318.5 filed Sep. 10, 2014, the disclosure of which is incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The invention relates to a pile hammer comprising a cylinder, a piston displaceably guided in the cylinder, a striker displaceably guided in the cylinder, which striker is disposed below the piston in the operating position of the pile hammer, a combustion chamber that is delimited axially by a face surface of the striker that lies in the interior of the cylinder and a face surface of the piston, as well as a disengagement apparatus by way of which the piston can be moved in the cylinder, into an upper position.[0004]2. Description of the Related Art[0005]Such pile hammers, such as diesel hammers, which are also called diesel pile drivers, are particularly used in foundation work in the construction industry. The pile ...

AI Technical Summary

Benefits of technology

The invention is a pile hammer that prevents damage when raised by a crane cable, and allows for single-cable handling on the crane side, even in offshore applications. The hammer has a carriage that is guided by a cable and a stop on the cylinder, which prevents the hammer from being raised too far. The hammer can also be placed horizontally using a roller body, making it easier to set up. Overall, this invention improves the lifting process of the pile hammer and reduces the risk of damage.

Problems solved by technology

It is a disadvantage of the previously known pile hammer that when the pile hammer is set up from a horizontal position by way of the crane cable, it can occur that the outer holding cables come to lie around the guide rails of the disengagement apparatus, which rails can be damaged when these cables are pulled.

Furthermore, it can occur that in the case of disadvantageous positioning of the cables, the main weight of the pile hammer lies on the center cable connected with the disengagement apparatus, thereby resulting in damage to the disengagement apparatus.

Furthermore, damage to the center cable, which is not designed for such stresses, can occur.

Last but not least, the center cable arrangement proves to be problematic in the case of the previously known single-cable handling on the crane side, because a pendulum movement of the pile hammer is caused by the tensile force applied to the disengagement apparatus by way of the center cable.

This movement can have a negative effect on the beginning of the pile-driving process.

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