EP2909444B1 - Method and device for transporting overburden away during tunnelling - Google Patents

Description

The invention relates to a method for removing overburden in tunneling.

A method for removing overburden in tunneling is over DE 197 00 297 C2 known. In the previously known method for conveying away overburden in tunneling, a conveying device is known which has a screw conveyor unit arranged in a casing. A first opening formed in a conveyor screw casing tube 20 and an outlet remote from the excavation are introduced into the casing. The opening and the outlet can be opened or closed by means of selectively actuatable closures. Furthermore, there is a device for discharging spoil to be conveyed away, which is designed to maintain a counterpressure in the casing. In the case of propulsion with liquid pumping, the first opening on the mining space side is open, the outlet remote from the mining space is closed and the discharge device is out of operation. In the case of excavation supported by earth pressure, the first opening on the excavation side and the outlet remote from the excavation are closed while the discharge device is in operation. In the case of an open advance, the first opening on the excavation side is closed, the outlet remote from the excavation is open and the discharge device is out of operation.

Out JP H11 22387 A a device for conveying away overburden in tunneling is known. This known device has two screw conveyors, each screw conveyor being surrounded by a casing. A first opening is formed in the casing of the worm conveyor on the mining area, which can be closed with an optionally actuatable first closure. Furthermore, there is a second opening remote from the excavation space, which is formed in a casing and can be closed with an optionally actuatable second closure which penetrates through the casing for fluid-mechanical separation of a first section and a second section of the arrangement of screw conveyors. In the device designed for liquid-assisted propulsion, the closable second opening serves to temporarily separate the conveyor screw away from the mining area, which rotates at a different speed from the mining area-side conveyor screw, for emptying purposes.

The invention is based on the object of specifying a method for conveying overburden in tunnel driving alternating between earth pressure-supported or open driving and liquid-supported driving, which is characterized by a less failure-prone and low-wear operation.

This object is achieved in a method for removing overburden in tunnel driving with the features of claim 1.

Because, according to the invention, in the method in a pressureless open drive or in a pressure-supported drive from a first opening in the discharge direction, overburden is discharged and a second opening formed in the cross section of a conveyor screw casing tube is deactivated for fluid mechanical deactivation of the first opening in the discharge direction A relatively less failure-prone and low-wear operation, since this wear-prone overburden is discharged early.

Further useful refinements of the invention are the subject of the subclaims.

Further useful refinements and advantages of the invention are the subject of the following description of exemplary embodiments with reference to the figures of the drawing.

Fig. 1

in einer anschaulichen Seitenansicht ein Ausführungsbeispiel einer Vorrichtung mit einer Tunnelvortriebsmaschine im erddruckgestützten Vortrieb,

Fig. 2

in einer Schnittansicht entlang der Linie II-II das Ausführungsbeispiel gemäß Fig. 1,

Fig. 3

in einer anschaulichen Seitenansicht das Ausführungsbeispiel gemäß Fig. 1 in einem flüssigkeitsgestützten Vortrieb,

Fig. 4

in einer Schnittansicht entlang der Linie IV-IV das Ausführungsbeispiel gemäß Fig. 3,

Fig. 5

in einer anschaulichen Seitenansicht eine Variante des Ausführungsbeispiels gemäß Fig. 1,

Fig. 6

in einer Schnittansicht entlang der Linie VI-VI das Ausführungsbeispiel gemäß Fig. 5,

Fig. 7

in einer anschaulichen Seitenansicht das Ausführungsbeispiel gemäß Fig. 5 bei einem flüssigkeitsgestützten Vortrieb,

Fig. 8

in einer anschaulichen Seitenansicht das Ausführungsbeispiel gemäß Fig. 5 bei einem diskontinuierlichem Ausschleusbetrieb in einem ersten Betriebszustand und

Fig. 9

in einer anschaulichen Seitenansicht das Ausführungsbeispiel gemäß Fig. 5 bei dem diskontinuierlichem Ausschleusbetrieb in einem zweiten Betriebszustand.

Show it:

Fig. 1

an illustrative side view of an embodiment of a device with a tunnel boring machine in earth pressure supported propulsion,

Fig. 2

in a sectional view along the line II-II the embodiment according to Fig. 1 ,

Fig. 3

in an illustrative side view, the embodiment according to Fig. 1 in a fluid-supported propulsion,

Fig. 4

in a sectional view along the line IV-IV the embodiment according to Fig. 3 ,

Fig. 5

in an illustrative side view, a variant of the embodiment according to Fig. 1 ,

Fig. 6

in a sectional view along the line VI-VI the embodiment according to Fig. 5 ,

Fig. 7

in an illustrative side view, the embodiment according to Fig. 5 with a fluid-assisted propulsion,

Fig. 8

in an illustrative side view, the embodiment according to Fig. 5 in a discontinuous discharge operation in a first operating state and

Fig. 9

in an illustrative side view, the embodiment according to Fig. 5 in the discontinuous discharge operation in a second operating state.

Fig. 1 shows an illustrative side view of a tunnel boring machine, which is equipped with an embodiment of a device for removing spoil and operated according to the method according to the invention. The tunnel boring machine according to Fig. 1 has a cutting wheel 2 equipped with excavation tools 1, which can be driven to rotate with a cutting wheel drive 3. In a mining space 4 located at the rear of the cutting wheel 2 in the advancing direction, the in Fig. 1 earth pressure-supported propulsion shown, also called EPB operation, filled with overburden to be removed and with shield washing liquid supplied as required via a shield washing liquid supply line 5 when the excavation chamber slide 6 is open.

An overcurrent line 7, which is also connected to a buffer space 8 enclosed by the cutting wheel drive 3, also opens into the excavation space 4. The connection between the excavation space 4 and the buffer space 8 via the overflow line 7 can be closed with an overflow line slide 9 or, if necessary, opened in order to maintain pressure conditions in the excavation space 4 adapted for EPB operation.

At the rear of the excavation space 4 in the advancing direction there is an annular space 10 into which a branch 11 of the shield flushing liquid supply line 5 opens, the branch 11 being closable by an annular space slide 12.

Furthermore, the tunnel boring machine has according to Fig. 1 Via propulsion cylinder 13, with which the cutting wheel 2 and a shield 14 with segments 15 as an abutment can be displaced in the propulsion direction. The segments 15, in turn, can be installed via a segment feed unit 16 and a segment positioning unit 17 for lining a tunnel wall.

The tunnel boring machine according to Fig. 1 is equipped with a conveying device 18 as a device for conveying away overburden, which in the in Fig. 1 illustrated embodiment has a main screw conveyor 19 formed with a core, which is surrounded by a main screw conveyor casing tube 20 and extends encapsulated from an open end protruding into the excavation space 4 through the annular space 10 against the advance direction away from the cutting wheel 2. The main screw conveyor 19 can be driven to rotate in two directions of rotation by a main screw conveyor drive 21, with any overburden present in the excavation space 4 in one direction of rotation, in particular with the shield cleaning fluid supplied through the shield cleaning fluid supply line 5 and possibly with further supplements from the excavation space 4 against the advance direction.

At an end of the main screw conveyor casing tube 20 facing away from the mining space 4, a main screw conveyor outlet 22 is provided as a first opening on the mining space side in the main screw screw casing tube 20, which can be optionally closed via a main screw conveyor outlet slide valve 23 as a first closure. In the ejection direction of the main screw conveyor outlet 22, a transverse conveyor belt 24 is arranged, with which material exiting the main screw conveyor outlet 22 and containing material to be removed can be transported away transversely to the advance direction and transferred to a back-up conveyor belt 25 conveying against the advance direction, which in turn can be moved together with a back-up conveyor 26 in the advance direction.

Furthermore, according to the representation Fig. 1 It can be seen that the main screw conveyor casing tube 20 in the discharge direction behind the main screw conveyor outlet 22 is closed with a transition opening passage shutter 27 as a second closure, with which a transition opening passage 28 formed by the cross section of the main conveyor screw casing tube 20 can be closed as a second opening, so that a screw casing is closed in the discharge direction of the main screw conveyor 20 subsequent screw conveyor casing tube 29 with a post-conveyor screw 31 which is rotatably arranged therein via a post-conveyor screw drive 30 and which is also part of the discharge device 18, is deactivated by fluid mechanics.

The post-conveyor screw casing tube 29 opens with its end facing away from the main conveyor screw casing tube 20 via a post-screw screw outlet 32 in the washing chamber 34 of a removal unit, which is enclosed by a cistern 33 and into which cistern washing liquid supply lines 35, which can still be exposed to washing liquid, open. In the cistern 33 there is arranged a tong breaker 36 with which, as explained in more detail below, coarse components conveyed into the cistern 33 can be crushed. In a bottom area of the cistern 33, a delivery line suction nozzle 37 of the removal unit opens, which is connected to a delivery pump 38 of the removal unit, with which, in turn, relatively thin fluid and only relatively small-grained material that is fed into the cistern 33 can be sucked out of the cistern 33. With the feed pump 38, which can be driven via a feed pump drive 39, the relatively low-viscosity material present in the washing chamber 34 can be introduced into a discharge line arrangement 40 of the discharge unit.

Fig. 2 shows in a sectional view along the line II-II the embodiment according to Fig. 1 with a view in the direction of advance. Out Fig. 2 It can be seen that due to the transverse arrangement of the transverse conveyor belt 24 with respect to the advance direction or the discharge direction, a free space is created below the main conveyor screw casing tube 20.

Fig. 3 shows in an illustrative side view the arrangement according to Fig. 1 in a liquid-assisted advance in which, on the one hand, the excavation chamber slide 6, the overflow line slide 9 and the annular chamber slide 12 are opened in order to maintain the liquid supply required for the liquid-assisted propulsion and the corresponding pressure conditions in the excavation space 4 and in the buffer space 8. In the liquid-assisted advance, on the other hand, the main screw conveyor outlet gate valve 23 is closed and the transition opening passage gate valve 27 is open, so that the transition opening passage 28 located between the main screw conveyor casing tube 20 and the post-screw screw casing tube 29 is now open and the waste pipe to be conveyed up by the main screw screw conveyor 29 is now open can be fed in and with the post-conveyor screw 31, which now rotates in a conveying direction, via the post-conveyor screw outlet 32 into the washing chamber 34 enclosed by the cistern 33. In the case of the liquid-assisted propulsion, as in FIG Fig. 3 shown schematically by arrows, via the cistern flushing liquid supply lines 35, washing liquid can be introduced into the washing space 34 in order to achieve a consistency of the material to be conveyed which is adapted to the operating parameters of the feed pump 38.

Fig. 4 shows in a sectional view along the line IV-IV the arrangement according to Fig. 3 . Out Fig. 4 The design of the tong crusher 36 with crusher jaws 42 that can be actuated via pressure cylinders 41 can be seen particularly well, with which the material present in the washing chamber 34, including relatively large-volume components, can be crushed until a sieve 43 upstream of the delivery line suction nozzle 37 can be passed.

Fig. 5 shows a modification of the based on an illustrative side view FIGS. 1 to 4 illustrated embodiment, wherein in the embodiment according to FIGS. 1 to 4 and the modification according to Fig. 5 corresponding elements are provided with the same reference numerals and are in part not explained again in more detail below to avoid repetition. With the modification according to Fig. 5 For EPB operation, the cross conveyor belt 24 and the back-up conveyor belt 25 are positioned in the area of a back-up screw outlet shutter 44, which is arranged at the back-up screw outlet 32 and which is open in this operating mode FIGS. 1 to 4 the cistern 33 and the feed pump 38 have been removed. Furthermore, according to the modification Fig. 5 A drip pan 45 is provided in the area of the post-screw casing tube 29 and the post-screw 31, which rests on the follower 26.

Fig. 6 shows in a sectional view along the line VI-VI the modification according to Fig. 5 with a view in the direction of advance. Out Fig. 6 it can be seen that as in the embodiment according to Fig. 2 Material emerging from the post-screw conveyor outlet 32 via the drip pan 45 is transported away via the cross conveyor belt 24 and the follow-up conveyor belt 25.

Fig. 7 shows in a clear side view the already based Fig. 5 and Fig. 6 explained modification, for the in Fig. 7 A roller crusher 46 is arranged at the post-conveyor screw outlet 32, with which material conveyed via the main conveyor screw 19 and the post-conveyor screw 31 can be crushed before it enters a discharge line 47 and a discharge pump 48.

Fig. 8 shows the arrangement according to Fig. 5 in the case of a discontinuous discharge operation in a first operating state, in which proceeding from an earth pressure-supported drive or an open drive to drive through a relatively short area with, for example, a high or high water pressure Pressure in the advance of the transition opening passage shutter 27 is opened and the post-screw outlet 32 is closed, so that the post-screw casing tube 29 is filled in the advance.

Fig. 9 shows the arrangement according to Fig. 5 in the discontinuous discharge operation in a second operating state, in which the transition opening passage shutter 27 is closed and the post-conveyor screw outlet 32 is opened without propulsion in order to convey the contents of the post-conveyor screw casing tube 29 via the cross conveyor belt 24 and the rear conveyor belt 25. Then it is again in the first operating state of the discontinuous discharge operation according to Fig. 8 returned and the change between the operating states in the discontinuous discharge operation continued until the critical area has been passed through discontinuously.

Claims (3)

1. Method for transporting away excavated material during tunnelling wherein, in open tunnelling or earth pressure-supported tunnelling, a first aperture (22) of a discharging apparatus (18) formed in the discharging direction in a screw conveyor cladding tube (20) is opened and a second aperture (28) formed in a cross section of the screw conveyor cladding tube (20) arranged downstream of the first aperture (22) in the discharging direction is closed, and in slurry-supported tunnelling the first aperture (22) is closed and the second aperture (28) is opened.
2. Method according to claim 1, characterised in that material is transported out of a flushing chamber (34) when the first aperture (22) is closed and the second aperture (28) is opened.
3. Method according to claim 2, characterised in that, in changing over from open tunnelling or earth pressure-supported tunnelling to slurry-supported tunnelling, flushing liquid is introduced into the flushing chamber (34) after closing the first aperture (22) and after opening the second aperture (28).

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