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Tünkers

Crane Shock Absorbers

Pressurized hollow rubber spring absorbs vibrations from piledriving and extraction.
Pressurized hollow rubber spring absorbs vibrations from piledriving and extraction.

Unlike our Vibratory Hammers, Tünkers’ own piling equipment does not have integrated elastomers. Therefore, they have developed a series of rubber crane shock absorbers for their own vibratory equipment. Combining these with Dieseko Group’s advanced vibration technology results in a highly effective damping mechanism. This combined damping has great effect when starting and stopping a Normal Frequency Vibratory Hammer and when pulling profiles. The latter for both Normal Frequency Vibratory Hammers and Vibratory Hammers with Variable Moment. This product is a prime addition to Dieseko Group’s assortment because it fits perfectly into one of the pillars in Dieseko Group’s philosophy: Limited Vibrations.

With growing tractive force the angles a are reduced, decreasing by that way the pressure stress of the hollow rubber spring proportionally to the tractive force.
From the practical perspective it is possible to introduce high tractive forces (high prestressing forces with heavy tractive work) into the pile-driving and extracting equipment without overloading the hollow rubber spring. Simultaneously with the stretching and retracting work of the hollow rubber spring, a swinging movement of the lateral pressure plates around the upper flexible joints is ensured, due to the geometrically arranged cable lines. Even with maximal tractive stress, the vertical swinging introduced by the pile-driving and extracting equipment is absorbed and not transmitted into the tractive cable of the carrier unit.

0%

reduction

In start-stop vibrations during operation with a Normal Frequency (NF) Vibratory Hammer.

0%

reduction

In peak-frequency vibrations during extraction, effective on both Normal Frequency (NF) and Variable Moment (VM) Vibratory Hammers.

0

different

types of Crane Shock Absorbers.

5 reasons to choose Tünkers Crane Shock Absorbers

  • Advanced Vibro-Insulation: Pressurized hollow rubber spring absorbs vibrations from pile-driving and extraction.
  • Adaptive Force Distribution: Adjusts to tractive forces, reducing pressure stress and enabling heavy-duty use without damage.
  • Crane Protection: Minimizes dynamic forces from vibratory hammers, safeguarding carrier equipment.
  • Heat-Resistant Design: Durable rubber spring and articulated structure effectively insulate against high-frequency vibrations.
  • Structural Stability: Flexible lateral plates prevent vertical vibrations from reaching the carrier's tractive cable, even under peak stress.
Download the Shock Absorber leaflet.

Product range

Type
Extracting Force (kN)
Height (mm)
Width (mm)
Depth (mm)
Weight (kg)
SD-20
120
1070
670
320
155
SD-30
160
1090
730
380
200
SD-70
250
1550
840
480
325
SD-130
500
2100
1060
600
750
SD-185
800
2370
1170
1250
1600
SD-1200
1200
3170
1550
1000
2500

Crane Shock Absorber Test

The shock absorbers were rigorously tested at the yard of Pilequip, our Australian subsidiary, using a 75-ton capacity crawler crane. To ensure precise evaluation, VMS Australia, a specialist in vibration monitoring, was engaged to measure vibration levels. VMS installed four measuring points on the crane: above the hook, at the top of the jib, midway along the boom, and in the operator’s cab.

The tests were conducted with two types of vibratory hammers: the ICE 32NF Normal Frequency Vibratory Hammer and the PVE 28VM Variable Moment Vibratory Hammer. Unlike normal frequency hammers, variable moment hammers do not produce start-and-stop shock, as their vibrations begin only after reaching higher frequencies. However, as soon as the vibrator is subjected to pulling force, the peak frequency vibrations are transmitted through the crane, regardless of whether a variable moment or normal frequency hammer is used.

The results demonstrated that Tünkers rubber shock absorbers effectively reduced vibrations by up to 93%. This significant reduction not only minimizes the transmission of vibrations but also helps to protect the crane from wear and tear, extending its operational lifespan and reducing maintenance requirements.

Location vibration sensors

Vibrations measured at 4 locations

  • Jib
  • Mid Jib
  • Hook
  • Cabin
Read the independent test report

Want our expertise? Connect with us!

David Hopkins

Area Manager

+31 6 11 62 65 91

Email me