EP0759117B2 - Device for driving a tunnel or drain pipe - Google Patents

Description

The invention relates to an arrangement for propulsion a tunnel or sewage pipe in the preamble of claim 1 specified version.

Arrangements of the above kind, according to the pipe pressing process (pipe jacking), Are known (DE 34 03 890 C1). They are often used to make microtunnels and Small tunnels up to about 3 m in diameter and lengths up to used about 800 m. This is a driven head through the press slide with constant addition of additional pipe sections through the ground pressed. So far, the accumulated overburden is either via conveyor belts, lorries or by rinsing (flushing conveyor) promoted to the outside. Here is the tape discharge relatively complex if you take into account that the tapes when pushing the pipe pieces need to be extended continuously. Add to that the relatively large space requirement of a belt conveyor system. The Discharge via wagons and rails is easy, but quite time-consuming, because the head only then can work when the lorry is on site. With gritty-grainy Soil, but also with hard rock, will promote flushing applied. The flows Carrier liquid or suspension at high speed through the cutting space of the head and carries about 15% of the circulating volume with overburden. The carrier liquid becomes above ground via cyclones and filters etc. separated from the overburden and flows into the cycle back to. This method is time-consuming bulky and not suitable for all floors. at very soft, fine-grained, for example loam or clayey soils has the attitude of earth pressure proven problematic. So there are so-called Earth pressure shields are used, where it points arrives that the feed and the removal of the material being conveyed is exactly balanced, so that neither an uplift of the ground nor a subsidence can occur. However, this condition can only be observed if the overburden is opposite the discharge screw still has so much friction, that the earth pressure can be maintained. this applies for rigid plastic and plastic floors, not however for floors with soft plastic or liquid Consistency that is not enough about the discharge screw Can build up friction.

With a tunnel head of a tunnel boring machine, the one equipped with a screw conveyor Has transport tube for the removal of the overburden, it is known per se (DE-A 3330635) to which a screening device at the outlet end of the transport pipe to join the a material lock is connected downstream. Water falls out of the sieve and fine material in an underlying container, which can be emptied via an outlet.

The invention has for its object a Arrangement of the type specified above to improve that even on floors with soft plastic and liquid consistency Avoidance of overburden breakthrough and earth pressure the head can be kept constant.

To solve this problem is the claim 1 specified combination of features proposed. Advantageous configurations and Further developments of the invention result from the dependent claims.

The solution according to the invention is based on the Thoughts out on the exit side of the with the Cutting area of the transport pipe connected to the head to build up a back pressure that also with soft plastic overburden adapted to the advance First pressure maintenance enabled. To achieve this, It is proposed according to the invention that the outlet-side end of the transport pipe one behind the other a pressure-tight lockable stone trap and the suction side of a slurry pump can be closed in a pressure-tight manner can be connected and that the thick matter pump pressure side with a successively extendable delivery line is connected for the overburden, the thick matter pump as a hydraulically operated piston pump is designed with one or two delivery cylinders, whose delivery cylinder can be closed in a pressure-tight manner Material feed container opens or ends in which one connected to the delivery line, alternately connectable to the delivery cylinder or cylinders Pipe slide engages. The pressure-tight training the overburden transport route to the suction side of the Thick matter pump enables the given propulsion Adaptation of the counter pressure to earth pressure, and regardless of the consistency of the overburden. The Thick matter pump can have an additional overpressure for the removal of the overburden through the conveyor line provide. The stone trap according to the invention in front of the suction side of the thick matter pump, which also Hermetically sealed, it ensures that it is along the delivery line to no blockers that only would be difficult to find.

The thick matter pump is expedient in that against the head of the pipe mounted. The thick matter pump and its preferably hydraulic drive units on one Interface separable and in two neighboring Pipe pieces can be assembled. To with the jacking head to be able to drive through curves, it is advisable the transport tube of the jacking head an elastic or articulated bendable compensator to connect with the thick matter pump. expedient the stone trap is rigid at the exit end of the transport pipe flanged while the compensator between the stone trap and the suction side of the Thick matter pump is arranged.

Pressure monitoring can be carried out along the Overburden transport route at least two intervening in this Pressure sensors are arranged. Earth pressure monitoring takes place advantageously by a pressure sensor engaging in the cutting area. Two additional pressure sensors can be used immediately be placed in front of and behind the stone trap. at Exceeding a predetermined pressure drop along the stone trap can indicate the presence of a Stopfers are closed, making an interruption of tunneling for the purpose of cleaning the stone trap makes necessary.

An advantageous embodiment of the invention stipulates that the stone trap with a pressure-tight a removable cover that can be closed on the entry side to the delivery pipe and on the outlet side to the suction side the pot connected to the thick matter pump arranged screen grid, the solid, such Stones or root pieces of a certain size, which could lead to a blockage of the delivery line, restrains. To clean the sieve grid is at stopped driving the covers. alternative the stone trap can also be used as a cross slide trained, in passage opening tapering and / or containing a screen Have passage channel for the overburden channel. In case of cleaning the cross slide is moved so that the passage channel from the outside for cleaning purposes is accessible.

To leave a space between for maintenance purposes Keeping the slurry pump and pipe wall clear especially with small diameter tunnel tubes the thick matter pump and / or its drive units one-sided to the vertical plane of symmetry of the tunnel tubes staggered. To prevent the head from rolling to avoid the longitudinal axis according to an advantageous embodiment of the invention a counterweight on the free side of the pipe section arranged for mass balance.

Because with fluctuating overburden consistency too the friction in the delivery line varies and partly can be very high, it is advantageous to be close to the Pressure output of the thick matter pump a lubricant injection to be provided in the delivery line. There can be a special lubricant, or just water, continuously injected into the delivery line and a sliding film between Conveyed material and inner pipe wall built become.

Fig. 1

eine nach dem Rohrpreßverfahren arbeitende Tunnelvortriebsmaschine in schaubildlicher Darstellung;

Fig. 2

eine Seitenansicht der Vortriebsmaschine nach Fig. 1;

Fig. 3a bis d

Schnitte entlang den Schnittlinien A-A, B-B, C-C und D-D der Fig. 2;

Fig. 4

eine vergrößerte Darstellung der Fig. 3d,

Fig. 5a und b

einen Längsschnitt durch die Steinfalle nach Fig. 2 und einen Schnitt entlang der Schnittlinie 5-5 der Fig. 5a.

The invention is explained in more detail below with reference to an exemplary embodiment shown schematically in the drawing. Show it:

Fig. 1

a tunnel boring machine working according to the pipe pressing method in a diagram;

Fig. 2

a side view of the tunneling machine of FIG. 1;

3a to d

Sections along the section lines AA, BB, CC and DD of Fig. 2;

Fig. 4

3 shows an enlarged illustration of FIG. 3d,

5a and b

a longitudinal section through the stone trap of FIG. 2 and a section along the section line 5-5 of FIG. 5a.

The tunnel boring machine shown in the drawing is for the production of micro tunnels and small tunnels determines which tunnel or Wastewater pipes using the pipe compression process (pipe Jacking) from a starting shaft 10 with the help of a hydraulically actuated press slide 12 in a tunneling section 14 are introduced.

The head 16 essentially consists from a cylindrical shield jacket 18, one of the Shield jacket delimiting on the face, motorized driven, equipped with cutting teeth 20 Scraper disc 22 and one with a motor driven Conveyor screw 24 equipped on the entry side engaging in the cutting space 26 of the head 16, through the partition 28 of the cutting space rearward reaching transport pipe 30 for the spoil 32 accumulating in the cutting space 26. Am exit end of the transport tube 30 is a can be closed in a pressure-tight manner by means of a cover 34 Flanged stone trap 36, the outlet port 38 via a flexible compensator 40 with the in a material feed container 42 located suction space a two-cylinder thick matter pump 44 connected is. The material feed container 42 is by means of a Lid 46 can be closed pressure-tight. The conveyor cylinders 48 of the thick matter pump 44 open into the front Material feed container 42. Your pistons are in the Hydraulic push-pull with the help of hydraulic cylinders 50 displaceable. Inside the material feed bin 42 is an S-shaped curved pipe switch 52, the inlet-side opening alternately in front of the Cylinder openings of the feed cylinder 48 pivoted is and its exit end 54 via a Pipe rotary connection to a delivery line leading to the outside 56 is connected. The control of the Thick matter pump 44 takes place via a hydraulic unit 58 and an electrical control unit 60.

The stone trap 36 shown in FIGS. 5a and b consists essentially of a cylindrical pot 82 with an inlet-side flange connection 84 for the transport pipe 30 and a laterally outgoing outlet outlet 38, and a screen 86, which is closed on the back by the cover 34 and is rigidly connected to it and at the end funnel-like towards the flange-side inlet opening 88 is open. This arrangement ensures that only such overburden that fits through the screen grid 86 to the thick matter pump 44 for removal is forwarded. With the overburden 32 arriving larger pieces collect in the sieve grid 86 and by removing the cover 34 together with the screen grid 86 from the stone trap 36 be removed.

At the start of the tunnel work, the starting shaft is opened 10 manufactured in the lowering process and the Press slide 12 in position within the starting shaft brought. Then the head 16 with With the help of the press slide 12 a little way into the tunneling section shifted in and the accruing Overburden removed from the starting shaft. step by step then the pipe pieces 62 in the starting shaft 10 lowered and with the press slide into the tunneling section 14 pressed. In the first pipe section 62 behind the Propulsion head 16, the thick matter pump 44 is mounted, the connected to the transport pipe 30 via the stone trap 36 becomes. The pressure side on the thick matter pump 44 outgoing conveyor line 56 is a two-armed Articulated tube 64 and the vertical line piece 66 led to the outside via the starting shaft 10. With each pipe section 62 becomes a further line section 68 introduced into the starting shaft 10 and into the delivery line 56 engaged. The machine feed then takes place gradually over the press slide 12 one tube length each. During the advance is by suitably positioned sensors 70, 72, 74 the pressure in the cutting space 26 of the head 16, at the entrance to the stone trap 36 and inside the suction chamber 42 measured and monitored. About constipation within the thick matter pump 44 and the delivery line 56 to avoid oversized stones and roots and other contaminants that are in the ground could be intercepted with the help of the stone trap 36. By continuous measurement of earth pressure over the Pressure sensors 72, 74 in front of and behind the stone trap 36 ensured that a tamper immediately discovered and can then be eliminated. The stone trap can be easily opened on its cover 34 for this purpose and be cleaned. This can be done automatically or done manually.

Because with fluctuating soil consistency too the frictional resistance in the delivery line 56 fluctuate and can sometimes be very high, is at the entrance of the Delivery line 56 an injection ring nozzle 76 is provided, via which a lubricant or water enters the delivery line can be injected.

Since both the thick matter pump 44 and that Hydraulic unit 58 accessible for repair purposes must be, they are left with a free space 78 arranged on one side to the tunnel vertical axis. By additionally attached in the relevant pipe section 62 Counterweights 80 become a mass balance caused to prevent the head 16 from rolling.

In summary, the following can be stated: The invention relates to an arrangement for Driving along a tunnel or sewage pipe one from a starting shaft 10 to a target shaft leading heading section 14. The arrangement is in front especially for the production of micro tunnels or small tunnels determined where step by step pipe pieces 62 in the tunneling section against one arranged at the front Propulsion head 16 are pressed. To the Removal of the overburden 32 is one in the cutting area 26 of the feed head engaging screw conveyor provided at the outlet end a stone trap that can be closed in a pressure-tight manner 36 and the pressure side closable suction side 42 a thick matter pump 44 can be connected while the thick matter pump 44 on the pressure side with a successive extensible conveyor line 56 connected for the overburden is.

Claims (14)

1. An arrangement for driving a tunnel or drain pipe along a driving stretch (14) leading from a starting shaft (10) to a target shaft, comprising a driving head (16), which has a cylindrical shell (18) and a drilling disk (22), which can be rotated on the front side about a center axis of the shell and can be driven by a motor, a number of pipe pieces (62), which can be introduced one after the other through the starting shaft (10) into the driving stretch (14), a first pipe piece (62) of the pipe pieces rests axially against the shell (18) of the driving head (16), a pressing carriage (12), which can be supported on an abutment within the starting shaft (10), and presses the pipe pieces (62) axially in the direction of the driving stretch (14), a cutting chamber (26), which can be loaded with ground spoil (32) through openings in the drilling disk, a transporting pipe (30) for the removal of the spoil (32) out of the cutting chamber (26), which transporting pipe is preferably equipped with a conveyor worm (24) or a pair of conveyor-worms, a spoil transporting stretch having means on its outlet side to be connected to the transporting pipe, and a thick matter pump (44) having a vacuum side which can be closed off pressure-tight, wherein the thick matter pump (44) is connected on its pressure side to a successively extendable conveyor line (56, 68, 66) for the spoil (32), the thick matter pump (44) being designed as a hydraulically operable piston pump with one or two conveyor cylinders (48), characterized in that the spoil transporting stretch comprises a stone trap (36), which can be closed off pressure-tight, in that the stone trap (36) and the vacuum side (42) of the thick matter pump (44) can be connected one after the other to the outlet end of the transporting pipe (30), and in that the conveyor cylinder or cylinders (48) end or ends in a material-feed container, which can be closed off pressure-tight, and into which extends a pipe switch (52) connected to the conveyor line (56) and alternately connectable to one conveyor cylinder or the conveyor cylinders (48).
2. The arrangement according to Claim 1, characterized in that the thick matter pump (44) is mounted into the first pipe piece (62) resting against the driving head (16)
3. The arrangement according to Claims 1 or 2, characterized in that the thick matter pump (44) and its preferably hydraulic driving aggregates (58) are separatable at a cutting point and is mounted into two adjacent pipe pieces (62).
4. The arrangement according to one of the Claims 1 to 3, characterized by at least two pressure sensors (72, 74) arranged along the spoil transporting stretch and extending into said stretch.
5. The arrangement according to Claim 4, characterized in that one pressure sensor (72, 74) is arranged directly in front of or behind the stone trap (36).
6. The arrangement according to one of the Claims 1 to 5, characterized by a pressure sensor (70) extending into the cutting chamber (26).
7. The arrangement according to one of the Claims 1 to 6, characterized by at least one pressure sensor extending into the conveyor line (56).
8. The arrangement according to one of the Claims 1 to 7, characterized in that the stone trap (36) has a screen grid arranged in a pot, which can be closed off pressure-tight with a removable lid (34), and is connected on the inlet side to the transporting pipe (30) and on the outlet side to the vacuum side (42) of the thick matter pump (44).
9. The arrangement according to one of the Claims 1 to 7, characterized in that the stone trap (36) has a passage channel for the spoil (32), which passage channel is designed as a cross slide, tapers in passage direction and/or contains a screen grid.
10. The arrangement according to one of the Claims 1 to 9, characterized in that the thick matter pump (44) and/or its driving aggregates (58) are mounted laterally offset, leaving an open space (78) with respect to the vertical axis of the respective pipe piece (62), and that a counterweight (80) is arranged on the open-space side of the pipe piece (62).
11. The arrangement according to one of the Claims 1 to 10, characterized in that the transporting pipe (30) of the driving head is connected to the thick matter pump (44) by means of an elastically or hingedly flexible compensator (40).
12. The arrangement according to one of the Claims 1 to 11, characterized in that between the stone trap (36) and the vacuum side (42) of the thick matter pump (44) there is arranged an elastically flexible compensator (40).
13. The arrangement according to one of the Claims 1 to 12, characterized in that a lubricant injector (76), preferably designed as a slide ring nozzle, is arranged in the conveyor line (56).
14. The arrangement according to one of the Claims 1 to 13, characterized in that the pressing carriage (12) carries an articulated pipe (64) connectable to the conveyor line (56).

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