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

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Fig. 3.5 Hydraulic unit The press-pull technique Via the adjusting adapter, the tractive forces from the traction linkage are applied to the end of the old pipeline as axial thrust forces. Hence the only traction-generated forces which act on the new run of pipe that is being pulled in are those generated by its own weight and the friction against its outer circumference. Arbeitsblatt GW 322-1 requires these forces to be continuously measured and recorded so that the new pipeline will not be stressed by tractive forces higher than those permitted. The measurement of the tractive forces is proof that the permitted load has not been exceeded during the replacement operation (for quality assurance). The socket acts in a similar way to a bore-widening device, which means that it is generally only at the socket that forces are generated by friction against its outer circumference. The -metre long main body of the pipe on the other hand, which is smaller in diameter, plays no part in generating any such frictional forces. Points of intended fracture, audio warnings of overloads, and similar provisions are not good enough as a guarantee of safety. The hydraulic press-pull unit is supported against the rear wall of the arrival pit via a steel abutment plate (Fig. 3. ). This plate is sized to suit the reaction forces and the nominal size of the pipes and there is only a small gap between it and the pipe so that, as far as possible, no earth will be forced into the pit. Launch pit 1st intermediate pit intermediate pit Machine pit/ arrival pit pull-in step with press-pull unit New pipeline Traction head Fig 3.7 The technique takes place in three steps Breaker cone Old pipeline Traction linkage Abutment plate 37
Trenchless replacement of gas and water pipelines The hydraulic traction cylinders of the press-pull unit allow the old pipes to be pressed out without percussion or jerks. In the intermediate pits (Figs. 3.7 and 3.8), the old pipe is slid over a breaker cone or is smashed into pieces by an automatic pipe smasher (Fig. 3.9). The fragments are conveyed to the surface in bins. In the final pull-in step, the old pipe, as it is pulled into the arrival pit, is generally broken as the traction cylinders made their backward stroke (Fig. 3.10). Fig. 3.8 Next step of the operation: Changing over the breaker cone in the intermediate pits Fig. 3.10 Final step: Changing the breaker cone over to the destination pit 38 2 nd pull-in step New pipeline Traction head Breaker cone New pipeline Traction head Old pipeline Traction linkage 3 rd pull-in step Old pipeline Abutment plate Fig. 3.9 The hydraulic pipe smasher Abutment plate Breaker cone Traction linkage
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 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 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
Page 98 and 99:
[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
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
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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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