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

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joints is DVGW Arbeitsblatt GW 3 8 of June 2002 [2. ]. The current designs are shown in section in this document together with the associated performance data. A distinction is made between joints which are locked by friction and joints which are positively locked. With its BRS ® frictionlocking joint and its BLS ® positive-locking joint, <strong>Buderus</strong> offers two innovative solutions in this case. In the BRS ® frictionlocking joint (Fig. 2.17), sharp, hardened stainless steel teeth bite into the surface of the inserting end and this produces the frictional connection. There are also friction-locking designs for bolted-gland socket joints. In the BLS ® positive-locking joint, a bead of weld metal is applied to the surface of the inserting end either in the factory or on site and appropriate force-transmitting members are supported against this bead and thus transmit the longitudinal force from one pipe to the next (Fig.2.18). Fig. 2.17 Fig. 2.18 Entwicklung der Verbindungstechnik The development of these socket joints, which are locked against longitudinal forces but at the same time able to hinge, to their present-day standard of maturity was essential to the development of modern-day trenchless techniques for installing pressure pipelines. In almost all of the trenchless installation and renovation techniques which are described in the present manual, it is a hinged string of pipes locked against longitudinal forces which is pulled into the final route of the pipeline. Whereas in the series of standards which applied previously, namely DIN 28 00 et seq., it was just the pipes and fittings which were exactly described, in the European standards which now apply, namely DIN EN for water pipes and DIN EN 9 for sewage conduits and pipes, there is a new aspect which is considered, namely the functional requirements they have to meet. With their exact descriptive specifications, the earlier national standards provided what was needed for technical delivery conditions. The additional aspect dealt with by the European standards, namely the functional requirements which the 17
Properties of ductile cast iron pipes pipe system and its joints have to meet, specifies what the performance of the pipe system and its joints has to be. In the type tests which are laid down for this purpose, the components and their joints are tested for the following: • Sealing of the components against internal water pressure • Sealing of joints against positive internal pressure when subject to loads at the crown resp. angular deflection • Sealing of joints against negative internal pressure when subject to loads at the crown resp. angular deflection • Sealing of joints against positive external pressure when subject to loads at the crown. The longitudinal force-fit joints also have to pass a dynamic test in which the internal pressure alternates between PMA and PMA- for 2 ,000 load cycles. The functional requirements described and the related type tests have been included in the technical rules of the DVGW (the German Technical and Scientific Association on Gas and Water) which are given in Arbeitsblatt GW 3 8. In view of the importance that highquality longitudinal force-fit restrained joints will have in the future for trenchless pipe installation, the supplementary requirement of an externally monitored type test was introduced when the above document was revised in 2002. As well as this, all designs have to be listed by the following characteristic performance parameters: • allowable component operating pressure (PFA) • allowable angular deflection. With these particulars plus an indication of the externally monitored type test, there being sets of particulars which are representative of respective ones of four groups of nominal sizes, the planning engineer has the right tool for selecting the design giving safety against tractive forces that is best suited to a specific task. 18
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 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 28 and 29: 2.4 Inside and outside protection I
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
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Fig. 6.2 Traction vehicle Fig. 6.3
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6.4 Joints The longitudinal force-f
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Areas of application, advantages an
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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
Page 96 and 97:
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
Page 114 and 115:
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
Page 126 and 127:
ZMU Before a pipe is cut, the ZMU s
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ZMU 127
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129
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131
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Buderus Manual on Trenchless Installation of Ductile Cast ... - Duktus

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