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

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5.3 General requirements Companies with which orders for directional drilling operations are placed must have the requisite qualifications. This is considered to be the case if the company holds a DVGW certificate under DVGW Arbeitsblatt GW 301 [ . ] or GW 302 [ .7] as the case may be, in the appropriate class GN 2. As well as this, a specialist supervisor who is qualified under DVGW Arbeitsblatt GW 329 [ .8} has to be appointed within the company. 5.3.1 Pipes and joints The pipes and joints must be suitable for the stresses which the technique produces. The permitted tractive forces, radiuses of bends and angular deflections are specified in Appendix A to Arbeitsblatt GW 321 for the usual pipe materials, namely steel, cross linked polyethylene (PE-X), PE 100 and ductile cast iron (see also Table 2.2 in section 2). Depending on the material, the pipes may have to be given suitable outside protection which will protect them against damage such for example as scoring. 5.3.2 Ductile cast iron pipes General requirements Ductile cast iron pipes to DIN EN (for drinking water) or DIN EN 98 (for sewage) are particularly suitable for trenchless installation by the directional drilling technique. A first feature which can be mentioned as being of significance in this connection is the actual material of the pipes. Ductile cast iron has the ability to survive extreme loads unscathed. Hence there is also virtually no chance of the wall of the pipe suffering damage from objects lurking unseen within the ground. Another excellent feature is the outside protection. Ductile cast iron pipes for the directional drilling technique are provided with a five millimetre thick coating of plasticmodified cement mortar (ZMU) to DIN EN 1 2 [ .9]. This effectively prevents any damage to the body of the pipe and is suitable for soils of whatever aggressiveness (under DIN 30 7 -2 [ .10]). The third prerequisite for the use of ductile cast iron pipes for the HDD technique is the BLS ® restrained joint. The BLS ® restrained joint, which is a longitudinal forcefit joint and a positive locking joint combines functionality and easy, quick and secure assembly. Without any great effort, it can be assembled in a matter of minutes even under the most adverse conditions, such as ice and snow. In this way it cuts the amounts 9
The horizontal directional drilling technique of time that are lost during the pulling-in process when single pipes or part-strings are being fitted together to an almost irreducible minimum. At the same time it has, under DVGW Arbeitsblatt GW 312, the highest permitted tractive forces of all the usual pipe materials which are used for installing pipelines. These permitted tractive forces can be used without being reduced in any way the moment the joint has been assembled. Cooling times or reductions in the tractive forces due to high pipe-wall temperatures or ambient temperatures or due to protracted pulling-in times are unknown when ductile cast iron pipes are being installed. The permitted tractive forces, operating pressures and angular deflections are given in Table 2.1 in section 2. For the maximum permitted tractive forces given in the table, the use of an (additional) high-pressure lock is laid down for nominal sizes from DN 80 to DN 2 0. The operating pressures and tractive forces shown are based on a wall thickness class of K9. Higher figures, both for operating pressure and also for tractive force, are possible by, for example, increasing the wall thickness class. If the angular deflections are ≤ 0.5° per joint, the figures quoted can be raised by a further 0 kN. Because of the angular deflections of up to ° which are possible at each joint, a very small radius of curvature of only 9 metres can be achieved. With regard to protection for the joints, the following options are available: • a sleeve of heat-shrink material to DIN 3072 • a sleeve of heat-shrink material to DIN 3072 plus a sheet-steel cone • a cement mortar protecting sleeve plus a sheet-steel cone. The crucial factor in deciding on the protection for the socket is the installation technique which has been selected. There are basically two variant procedures that can be followed in pulling in ductile cast iron pipes: 1. pulling-in of a string or part strings of pipes 2. pulling-in of individual pipes. A point in favour of the first variant, the pulling-in of a string of pipes, is that the string of pipes is first assembled from individual pipes and is then filled with water and pressure tested before being pulled into the bore which has now been completed. For a long time, this variant was even laid down by insurers because it was considered safest. During the pulling-in there is only a brief interruption in the traction to allow the traction rod to be removed at the machine end. The time this takes has to be kept as short as possible to stop the thixotropic effect from taking place in the drilling mud. This effect causes it to solidify. 0
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Buderus Ma
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Buderus Ma
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1. Introduction Introduction When t
Page 8 and 9:
Buderus Ma
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 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 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
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
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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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