Reliable STT293 - Counter-Jib Ballast; Introduction

STT293 CONCISE TOWER CRANE MANUAL
-38- EURC1.0ENG
1.4. COUNTER-JIB BALLAST
1.4.1. INTRODUCTION
The counter-jib ballast consists of various reinforced concrete blocks A, B or
C. The counter-jib ballast is governed by the length of the jib. These blocks are
suspended one by one at the rear of the counter-jib.
The ballast is to be supplied by the client in accordance with Fig. 1.4.2-1.
During installation, care must be taken to ensure that they cannot be chipped or
become loose while operating the crane.
Composition and structural dimensions are dealt with in .1.4.2
The admissible tolerance is
50
0

kg per block. To allow for concrete density
changes, alter dimension X to bring the blocks within the indicated tolerance.
We recommend weighing the concrete blocks and marking their weight with
paint on a visible side of the block.
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