Contractors World

The construction industries leading e-magazine -
Contractors World
a free online digital publication for
construction, demolition, mining and quarrying industries

Contractors World 2012 Volume 3 Issue 2
Forward: Print Page Register (free) Bookmark Page

cw cw cw cw cw Buyers Guide cw cw cw
Tweet this page


• back issues
• brochures
• videos

cwmags blog

previous page   PAGE 18    next page

Cost-effective realisation of arched tunnel for safe animal crossing - page 2 of 2

Mechanical solution – easy handling

Due to the low number of uses of the formwork carriage, it was decided not to use hydraulic components for shuttering and striking or moving procedures. The main focus during the planning of the mechanical solution was on the ease of use.

Shuttering and striking of the internal formwork is carried out easily and problem-free by means of spindles; subsequently, the formwork carriage is moved to the next casting segment using two winches. The external formwork is moved by crane.

For shuttering and striking, the construction team utilises simple spindles. In order to pivot the side elements inwards, only the lowest spindle has to be used.

By releasing the heavy-duty wedges under the HDT girders, the entire formwork unit is lowered by around 8 cm. In the subsequent casting segments, the formwork carriage is pulled by means of two winches with the flat and straight course of the tunnel simplifying this process.

Hydraulic jacks bring the formwork carriage into concreting position after moving, the side elements are then spindled upwards. Extensive prefabrication of the reinforcement sections directly next to the tube accelerates their installation. Finally, a mobile crane moves the external formwork into position which consists of only two elements per side. For placing the concrete, 12 concreting windows are used whilst compaction is carried out through internal vibrators.

Through the simple mechanical operations of the formwork carriage, the construction team was able to achieve a four-day cycle per concreting section after a very short familiarization Period.

A completely safe solution

Apart from the easy usability of the formwork carriage, the safety of site personnel has the highest priority. Among other things, the carriage has generously-sized working levels that are pre-assembled on the external formwork. SRU steel walers and GT 24 lattice girders form the sub-structure of the platforms.

The mechanically operated formwork carriage is 10 m long; the construction team requires four days for each concreting section.

The construction site team is guaranteed secure working conditions through the 1.10 m high PROKIT side mesh barrier which is fitted to all open edges.

Click here for more information >>> Peri Variokit




Contractors World - Eco Friendly publishing
By reading this page on line you are helping to save trees.
Trees saved up to February 2012 >461

previous page   PAGE 18   next page

red divide
CW Contractors World - the digital publication for construction industry

Contractors World Magazines are published by VVV Limited
©VVV Ltd 2012 All Rights Reserved

Publisher: Roger Lindley
Content compiled and edited by:
Roger Lindley MCIM

Page updated: February 2012



Contractors World - UK & Ireland
Contractors World - UK & Ireland Edition
up-to-date information on news, plant and equipment in the UK & Ireland.

Contractros World - Australia
Australia News
Online Buyers Guide of Construction, Quarrying & Mining Suppliers

Contractors World Magazines are proud supporters of the Lighthouse Club

Contractors World Magazines are proud supporter of the Lighthouse Club

CML House
7 Bell Mead
Herts CM21 9ES
Tel: +44 1279 600598

Contractors World is many magazines in one - construction news for latest information (read our daily news pages) and a site equipment magazine featuring site reports from around the world and reviews of construction plant and equipment as it is introduced.

Written specifically for earthmovers, quarry management, plant hire executives, and others with an interest in the construction and related industries.

Registered Office: 54 Sun Street, Waltham Abbey, Essex EN9 1EJ, UK
Registered as a company in England and Wales, number 3892263

Contractors World, CP&E - Contractors Plant & Equipment and the Contractors World - UK & Ireland Edition are independent publications published through CWMags.

The mention of companies and/or products within the editorial pages or in advertisements does not infer any endorsement by the publisher or editors. All editorial is freely given, without conditions and at the sole discretion of the editor. Opinions expressed by contributors are not necessarily those of the publishers. Other than saving and distributing in complete page formats, copying, reproduction, decoding or disassembly of content or computer code by any means of any part of the publication is prohibited unless prior approval is provided by VVV Ltd in writing and confirmation received of agreement with any terms and conditions applicable. PDF version may be downloaded for personal use but no content may be used for promotional purposes or copied to web sites. All images and video content are subject to copyrights.