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

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<strong>Buderus</strong> Giesserei Wetzlar GmbH is able to make traction heads available to the companies doing the work on hire against a hire charge. At least two pits are always required for renovation by the relining technique. The size of the pits depends on the traction equipment that is used. The pipes are six metres in length and because of this the assembly pit should be at least eight metres long. The width of the assembly pit depends in the nominal size of pipe which is going to be installed (Fig. 7. ). 7.2.2 Pushing-in Fig. 7.6 View of an assembly pit For pushing-in, ductile cast iron pipes having TYTON ® restrained joints which are not of the longitudinal force-fit type are pushed into the old pipeline. When this is done, the axial thrust is transmitted to the end-wall of the TYTON ® socket from the endface of the inserting end. Because the inserting ends of the pipes are bevelled, it is not the entire cross-section of the pipe-wall that is available to transmit the axial thrust (Fig. 7.7). Also, allowance must be made under DIN EN for the smallest outside diameter that is possible for the pipes. The compressive strength of ductile cast iron is σ D = 0 N/mm². Leaving aside any safety factor, a pressing force of P = σ D x A wall is thus possible, where A wall is the cross-sectional area of the wall of the cast iron which transmits the force. Fig. 7.7 Transmission of force in pushing-in P = σ D x A Wall A description of the technique, pulling-in 79
The pipe relining technique However, the figures obtained by adopting this theoretical approach cannot under any circumstances be taken as permitted pushing-in forces. In view of the incidental conditions which may apply in the given case, such as possible angular deflections of the joints, the roughness of the wall of the pipe which is to be renovated, the annular gap which is left, and so on, it may be necessary to allow a considerable safety factor. Table 7.1 Calculation of theoretical pushing-in forces 80 DN d 1 [mm] Wall thickness class s min [mm] Perm.σ = [N/mm 2 ] F perm [kN] 80 98 K 10 .7 0 2 100 118 K 10 .7 0 32 12 1 K 9 .7 0 00 1 0 170 K 9 .7 0 77 200 222 K 9 .8 0 2 0 27 K 9 .2 0 1010 300 32 K 9 . 0 1 2 3 0 378 K 9 0 1913 00 29 K 9 . 0 2 00 32 K 9 7.2 0 3787 00 3 K 9 8 0 21 700 738 K 9 8.8 0 3 99 800 8 2 K 9 9. 0 1 1 900 9 K 9 10. 0 70 0 1000 10 8 K 9 11.2 0 92 2 The pushing-in forces which are shown do not include a safety factor. This must be suited to the local conditions and must be agreed with the Applications Engineering Division of <strong>Buderus</strong> Giesserei Wetzlar GmbH. Example: DN 900, wall thickness K 9, A wall = 12.83 mm² Pressing force with no safety factor allowed for P = σ D • A wall = 0 N/mm² x 12.83 mm² = 70 0 kN With an assumed length for the pipe string of 200 m, DN 900 and wall thickness K 9, the weight of the pipe string would be ,000 kg ( t). With a coefficient of friction µ = 1.0 a pressing force of 0 kN would be required. The theoretical maximum permitted pressing force F perm on the other hand is 70 0 kN (see Table 7.1).
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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
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
Page 78 and 79: 7. 2 A description of the technique
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
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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Buderus Manual on Trenchless Installation of Ductile Cast ... - Duktus

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