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

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Table .1 provides an overview of the possible ways of protecting the joint with the different variant procedures: Table .1: Possible ways of protecting the joint General requirements Variant Outside protection Joint protection Pulling-in of single pipes ZMU Cement mortar protecting sleeve plus sheet-metal cone Pulling-in of pipe strings or part-strings ZMU Cement mortar protecting sleeve or shrink-on sleeve plus sheet-metal cone 1) 1) Information on this subject can be found in our product catalogues. Shrink-on sleeves of tape material should be avoided on directionally drilled pipelines if at all possible. The two installation procedures mentioned above, namely the pulling-in of single pipes and the pulling-in of pre-assembled pipe strings or part-strings, are used as dictated by the amount of space available on site. In built-up inner city areas, it is, for the most part, the pulling-in of single pipes which has to be considered. A launch pit about seven to eight metres in length is required for this. Assembly and the protecting of the sockets take place in the pit. Interference with the surface of the street can be even smaller if the pipes are joined together on a mobile ramp. Depending on the governing conditions, such as nominal diameter, supporting ground and the preparation of the sliding surface of the pipe string, lengths of some hundreds of metres can be pulled in. Example: DN 200 ductile cast iron pipes with cement mortar coating, BLS ® joints and highpressure locks, wall thickness class K9 • permitted tractive force F zul : 3 0 kN (PFA bar) • weight of pipe G pipe : 271,5 kg = 45,25 kg/m ≈ 0,46 kN/m • coefficient of friction µ = 1,0 What is thus obtained for the permitted length of the pipe string, from the formula L perm = F perm / (G pipe * µ) = 350 kN / (0,46 kN/m * 1,0) ≥ 7 0 m In many cases, the coefficient of friction µ that will occur will be appreciably less than 1.0, thus enabling substantially longer lengths to be installed. In this way, coefficients of friction of between 0. and 1.0 were found in a series of measurements of tractive force made on DN 00 pipes and the average was µ = 0.78 [ .11] 3
The horizontal directional drilling technique 5.4 To sum up In their current form, <strong>Buderus</strong> Giesserei Wetzlar GmbH‘s ductile cast iron pipes with coatings of plastic-modified cement mortar and BLS ® restrained joints are not only suitable for laying in open trenches but are also a useful alternative when modern trenchless installation techniques, such as steerable horizontal direction drilling, are being used. They combine a very simple joint system which can be assembled quickly and under almost any conditions but is still able to carry high loads with a coating which is equal to the demands made on it. What is more, the pipes will withstand virtually all the external stresses that occur in directional drilling and their material has what is by far the longest technical operating life of all pipe materials under DVGW Hinweis W 01 [ .12]. Ductile cast iron pipes are the right choice when it is a matter of making a lastingly worthwhile capital investment. Word has spread that this is the case, and proof of this can be seen in the many pipelines that have been installed in recent years and decades using the horizontal directional drilling technique. The list of reference installations given in Table .2 can only show a small number of the most interesting of these directional drilling projects.
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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
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 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 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
Page 80 and 81: Buderus Giesserei
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 96 and 97: 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
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Retrospective application of weldin
Page 116 and 117:
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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