Buderus Manual on Trenchless Installation of Ductile Cast ... - Duktus

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2.4 Inside and outside protection Inside and outside protection Hand in hand with the introduction of ductile cast iron, there was also a rapid development in systems for inside and outside protection. Nowadays, pipes, fittings and accessories of ductile cast iron are all supplied complete with linings and coatings of a wide variety of types as an integral part of the product. The nature of the protection is governed by the conditions of installation and operation. 2.4.1 Outside protection The grey cast iron pipes of the period from the end of the 19th century to the mid- 20th century were endowed with their legendary long life by dipping them in liquid tar or asphalt, but the use of tar was discontinued at the end of the 1970‘s, roughly at the same time as ductile cast iron was introduced. As from the 1970‘s, dip-coating with tar was superseded by coating with bituminous paints. This was supplemented, or its field of application extended, by zinc coating (introduced later, as from the early 1970‘s) and by coatings of plastic-modified cement mortar (from 1978 on). More recently, the place of bituminous paints has also been taken by epoxy resin coatings. Because of the enormous importance it has for the use of ductile cast iron pipes in trenchless installation techniques, the cement mortar coating will be looked at in detail at this point. The cement mortar coating was initially developed chiefly as an outside protection for ductile cast iron pipes when they were going to be installed in stony ground, where it would have been expensive to get hold of sand or non-stony soil to bed the pipes in. The characteristic features of a coating of this kind are its high mechanical strength and resistance to chemicals, high impact resistance and high strength of adhesion. These requirements were decided on in consultation with the users and have been combined with the requisite methods of testing in DIN 30 7 -2 [2.10]. To implement the European construction product directive, a European standard, DIN EN 1 2 [2.11] has been laid down for cement mortar coatings for ductile cast iron pipes. In this connection, it will be recalled that the technical rules for conventional pipelaying give detailed requirements that the nature of the pipeline zone has to meet in order to safeguard the pipeline components against damage and deformation. In the first place, the bedding layers have to be produced from non-stony soil in such a way that the pipes rest down evenly over their entire length. The wedge-shaped space between the pipes and the bedding layers has to be evenly packed with non-stony soil, and any changes in the position of the pipe have to be avoided when this is done. 27
Properties of ductile cast iron pipes The trench then has to be infilled layer by layer with non-stony soil at the sides, next to the pipe, and this has to be compacted as directed by the stress analyst, before finally, after 30 centimetres of non-stony soil has been dumped in and compacted over the crown of the pipe, the requirements become rather less stringent (Fig. 2.2 ). Main infill Direct cover zone Lateral infill Upper bedding layer Lower bedding layer Fig. 2.25 DVGW Arbeitsblatt W 00-2 [2.12] provides an overview of the grain-sizes of filling and bedding materials for be used for various pipe materials. Under it, ductile cast iron pipes can be bedded in materials with a maximum grain size of 100 millimetres. The aim and intention of all the requirements is to ensure that the pipes will produce a pipeline of exactly circular cross-section in which there are no unacceptably high stresses in the walls of the pipes. This is the only way in which the long operating life that is desired can be achieved. Let us now consider the bedding conditions for a pipe which is installed by a trenchless technique: it is true that the customer will have a general knowledge of the ground he has, but he will certainly not be able to rule out the possibility of stones or other sharp objects being present along the run, against which the pipe will rub while it is being pulled in. With the burst lining technique for example, the new pipe is pulled through 28 Surface Walls of trench Height of cover OD Bedding Depth of trench Pipeline zone
Page 1 and 2: Buderus Ma
Page 6 and 7: 1. Introduction Introduction When t
Page 10 and 11: At x 100 magnification, these graph
Page 12 and 13: 10 3 kp cm Fig. 2.7 Steel Ductile G
Page 14 and 15: Fig. 2.11 How the pipes are produce
Page 16 and 17: 2.3 Development in the joint-making
Page 18 and 19: joints is DVGW Arbeitsblatt GW 3 8
Page 20 and 21: Longitudinal force-fit joints and t
Page 22 and 23: Longitudinal force-fit joints and t
Page 24 and 25: 2.3.2 Making the BLS ® joint Makin
Page 26 and 27: Fig. 2.21 Left lock Catch Right loc
Page 30 and 31: Inside and outside protection the c
Page 32 and 33: Reference documents [2.8] Gaebelein
Page 34 and 35: General What is said above is true
Page 36 and 37: Other pluses that the two technique
Page 38 and 39: Fig. 3.5 Hydraulic unit The press-p
Page 40 and 41: 3.2 The auxiliary pipe technique Th
Page 42 and 43: In the final stage of the operation
Page 44 and 45: 3.4 Requirements for the site Requi
Page 46 and 47: Reference documents
Page 48 and 49: Both the variants of the burst lini
Page 50 and 51: During the pulling process, the tra
Page 52 and 53: 4.3.2 Joints As in virtually all tr
Page 54 and 55: Reference documents 3
Page 56 and 57: Fig. 5.3 Assembly of the string of
Page 58 and 59: the outlet nozzles. In rocky soils,
Page 60 and 61: 5.3 General requirements Companies
Page 62 and 63: A prerequisite for this procedure i
Page 64 and 65: Table .1 provides an overview of th
Page 66 and 67: Installations Nominal size DN lengt
Page 68 and 69: Reference documents [ . ] DVGW Arbe
Page 70 and 71: Fig. 6.2 Traction vehicle Fig. 6.3
Page 72 and 73: 6.4 Joints The longitudinal force-f
Page 74 and 75: Areas of application, advantages an
Page 76 and 77: Reference documents 7
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7. 2 A description of the technique
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Buderus Giesserei
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Fig. 7.8 Pushing in a pipe A descri
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7.5 Reference installations No. Loc
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[7. ] Rink, W.: Langrohrrelining mi
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In the second step, the pilot is up
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8.3 Outside protection Outside prot
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8.6 Reference documents [8.1] Richt
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A consideration of the economics of
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A consideration of the economics of
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[9.2] DVGW-Hinweis W 09: Auswirkung
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BLS ® restrained joint DN 80 to DN
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Technical data sheets 101
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General Pipes must not be: • drop
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Filling in the pipe pit DN 80 - DN
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DN 80 - DN 00 BLS ® joints There m
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Use of clamping ring joints DN 80 -
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Notice on assembly DN 80 - DN 00 BL
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Retrospective application of weldin
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11.2 Installation instructions for
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Inserting the locking segments DN 0
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Angular deflection DN 00 - DN 1000
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Disconnecting BLS ® joint disconne
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Shrink-on devices and protective ta
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ZMU Before a pipe is cut, the ZMU s
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ZMU 127
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129
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Buderus Manual on Trenchless Installation of Ductile Cast ... - Duktus

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