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

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A consideration of the economics of trenchless techniques form of the series of documents numbered GW 321 et seq. which ensure exactly that. The parameters of current trenchless installation and renovation techniques which are relevant to quality are described and laid down, together with limit values and directions for measuring them. DVGW Hinweis W 09 stresses the paramount influence which the pipe system selected has on the choice of the installation or renovation technique. The principal considerations affecting the choice of the pipe system are stated to be the following: 1. Bedding conditions and conditions of use (e.g. diffusion characteristics, reserves of performance) 2. Functionality of the corrosion protection systems and the connecting technology 3. Whether experience has been good with the given system . Reasonable availability (delivery times, stocks held, continuity of systems). In what follows, the system consisting of ductile cast iron pipes with BLS joints and cement mortar coatings will be looked at more closely to see how well these four principal requirements are met. Requirement 1: Experience shows that ductile cast iron pipes are the pipes least sensitive to faults in the bedding. The disadvantage which trenchless techniques have that the bedding for the pipes cannot be checked is of least significance with pipes of this type, a fact which is proved not least by the excellent results shown by the DVGW‘s damage statistics for the water industry [9. ]. The non-diffusiveness of ductile cast iron pipes makes them preferable to plastic pipes in contaminated soils [9.7]. Because of their high energy of deformation, ductile cast iron pipes have the greatest reserves of performance, both in respect of static and dynamic loads from the internal pressure or the covering earth and in respect of the permitted tractive forces (see section 2). Requirement 2: Given that the bedding and supporting conditions are unknown and uncheckable with trenchless installation techniques, it is ductile cast iron pipes with, usually, a cement mortar coating to DIN EN 1 2 that are used for these techniques. An at least five millimetre thick layer of plastic-modified cement mortar is applied in this case to a zinc covering of a weight of 200 g/m 2 . This coating is able to withstand extreme mechanical loads and is resistant to scoring by pointed fragments with the burst lining technique or by stones with the directional drilling technique. In the unlikely event of damage being done to this coating, the zinc covering is still available to provide active protection and its effect operates for a distance of up to 20 millimetres. 9
A consideration of the economics of trenchless techniques, Reference documents The advantage of ductile cast iron pipes whose effect is most far-reaching is the connecting technology using the longitudinal force-fit BLS ® restrained joint. This is due in the first place to the tractive force permitted for the material of the pipes, which is the highest for any of the materials used in the water supply industry (section 2, Fig. 2.19). When part-strings are required, this has a beneficial effect on their lengths. In the second place however, the most important prerequisite for economy is the short assembly time for the BLS ® joint. The fact that single pipes can be assembled means that short installation pits and point sites are possible and that the speed of installation is determined by the time taken to change over the drilling and traction linkages at the machine end. The full permitted tractive forces can be applied the moment the short process of assembling the joint has been completed; there is no cooling time and no need for temperature-related reductions. These facts are the key to economic success when using ductile cast iron pipes for trenchless installation and renovation techniques. Requirement 3: Cast iron is the oldest material used for industrially manufactured water pipes. Approximately half of the existing water supply network consists of pipes made of materials falling within this group. The resistance of ductile cast iron pipes and their long life is the basis for the excellent experience that has been had with them in practice, experience which has once again been corroborated in very recent times [9.7 and 9.8] Requirement 4: <strong>Buderus</strong> Giesserei Wetzlar GmbH is an important manufacturer in the German cast iron pipe industry and it is precisely in very recent times that, with its technical developments for trenchless installation techniques, it has shown itself to be a pioneer, though without of course losing sight of the ties it has with the traditional techniques. For <strong>Buderus</strong> Giesserei Wetzlar GmbH reliable supply and continuity of its systems have always been the supreme commands in a customer-oriented business strategy which will continue to contribute to the success of the group in the future. 9.1 Reference documents [9.1] Steinhauser, P.: Wirtschaftlichkeitsbetrachtungen, Betrachtungen bei der grabenlosen Erneuerung. [Economic considerations, considerations relating to trenchless renovation]. Script of a talk given at the NO DIG Seminar on trenchless renovation of old, damaged pipes. Hanover Technical Academy, 18.01.2007 9
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Buderus Ma
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Buderus Ma
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1. Introduction Introduction When t
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Buderus Ma
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At x 100 magnification, these graph
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10 3 kp cm Fig. 2.7 Steel Ductile G
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Fig. 2.11 How the pipes are produce
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2.3 Development in the joint-making
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joints is DVGW Arbeitsblatt GW 3 8
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Longitudinal force-fit joints and t
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Longitudinal force-fit joints and t
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2.3.2 Making the BLS ® joint Makin
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Fig. 2.21 Left lock Catch Right loc
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2.4 Inside and outside protection I
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Inside and outside protection the c
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Reference documents [2.8] Gaebelein
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General What is said above is true
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Other pluses that the two technique
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Fig. 3.5 Hydraulic unit The press-p
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3.2 The auxiliary pipe technique Th
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In the final stage of the operation
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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
Page 78 and 79: 7. 2 A description of the technique
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Page 82 and 83: Fig. 7.8 Pushing in a pipe A descri
Page 84 and 85: 7.5 Reference installations No. Loc
Page 86 and 87: [7. ] Rink, W.: Langrohrrelining mi
Page 88 and 89: In the second step, the pilot is up
Page 90 and 91: 8.3 Outside protection Outside prot
Page 92 and 93: 8.6 Reference documents [8.1] Richt
Page 94 and 95: A consideration of the economics of
Page 98 and 99: [9.2] DVGW-Hinweis W 09: Auswirkung
Page 100 and 101: BLS ® restrained joint DN 80 to DN
Page 102 and 103: Technical data sheets 101
Page 104 and 105: General Pipes must not be: • drop
Page 106 and 107: Filling in the pipe pit DN 80 - DN
Page 108 and 109: DN 80 - DN 00 BLS ® joints There m
Page 110 and 111: Use of clamping ring joints DN 80 -
Page 112 and 113: Notice on assembly DN 80 - DN 00 BL
Page 114 and 115: Retrospective application of weldin
Page 116 and 117: 11.2 Installation instructions for
Page 118 and 119: Inserting the locking segments DN 0
Page 120 and 121: Angular deflection DN 00 - DN 1000
Page 122 and 123: Disconnecting BLS ® joint disconne
Page 124 and 125: Shrink-on devices and protective ta
Page 126 and 127: ZMU Before a pipe is cut, the ZMU s
Page 128 and 129: ZMU 127
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