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

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3.2 The auxiliary pipe technique The auxiliary pipe technique In the auxiliary pipe technique, the replacement process is divided into a number of steps. As in the press-pull technique which was described in section 3.3, in this case too a machine pit and a launch/assembly pit are required, together with the intermediate pits at house connections or branch pipes. The distances between the individual pits are similar. In the first step, the installing and intermediate pits are dug, the connecting pipes to houses are sealed off and the pipes to provide an emergency supply are connected up (Fig. 3.11). Machinery pit with pipe replacing unit Hydraulics intermediate pit intermediate pit Pipe assembly/launch pit Auxiliary pipe Old pipe Old pipe Old pipe Fig. 3.11 Making the assembly/launch pit and cutting the old pipes in the intermediate pits Missing pieces of the old pipe, resulting from the removal of house connections or similar are replaced by transition pieces. Then, by means of auxiliary steel pipes connected by longitudinal force-fit restrained joints, the pressing unit presses the old pipes into the assembly/launch pit until they have all been removed (Fig. 3.12) Machinery pit with pipe replacing unit Hydraulics intermediate pit intermediate pit Launch/assembly pit Auxiliary pipe Old pipe Transition piece Old pipe Transition piece Old pipe Fig. 3.12 Pressing out the first, second and third sections of the old pipe by means of an auxiliary pipe 39
Trenchless replacement of gas and water pipelines It may be helpful in this case for individual sections to be detached by means of hydraulic jacks before the entire run of old pipe is pushed through into the launch/assembly pit. Because sections measuring up to metres in length can be removed from this pit, the technique is also an obvious one to use for the replacement of old steel pipes, because these cannot be burst over a breaker cone (Fig. 3.13). Fig. 3.13 Full-length old pipes The whole of the last old pipe having been removed, the run is filled by the re-usable auxiliary pipes (Fig. 3.1 ). These now carry the loads from the top cover and the traffic load and thus safeguard the bore for the pipeline. Machinery pit with pipe replacing unit Hydraulics intermediate pit intermediate pit Fig. 3.14 Auxiliary pipes occupying the whole of the run 0 Auxiliary pipe Pipe assembly/launch pit
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 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 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 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
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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
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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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131
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Buderus Manual on Trenchless Installation of Ductile Cast ... - Duktus

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