JPS6228275B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention includes a compartment that separates the excavation chamber from a rear shielded space, and the excavation chamber is used to pressurize the mountain liquid present in the excavation chamber. communicated via a conduit with a pressure storage chamber containing mountain liquid present under adjustable pressure, and in which the excavated earth and sand are transported hydraulically from the excavation chamber. This invention relates to a shield excavation device that performs work while retaining a face.

German Patent Application No. 2 22 7 083 discloses a shield of this type for tunnel excavation by retaining the face with liquid. In this shield, the accumulated liquid is loaded with air pressure in a double chamber within the shield according to the principle of a communicating tube. This double chamber therefore consists of an excavation chamber which is open in the direction of the face and a pneumatic chamber located behind it and which communicates with the excavation chamber in the bottom region. In order to provide these two chambers, there are two chambers within the shield that actually extend over the entire shield cross-section.
Two partition walls are provided one after the other at intervals. In this case, the shaft of the excavator, which is designed as a full-section excavator, must be passed through both bulkheads through the gap. The shear is transferred from the excavation chamber in front to a pneumatic chamber located behind it, and from this pneumatic chamber a conveyor device, for example a drag conveyor, is transferred to an intermediate conveyor in a pneumatic cushion and a partition gate installed at the rear of this intermediate conveyor. It will be carried out via Since the pneumatic cushion must be maintained in the upper region of the pneumatic chamber, the pneumatic chamber must be constructed in a gas-tight manner. Overall, the known shield drilling equipment requires a considerable construction outlay. At the same time, the area of the face of the shield is increased by that amount due to the double chamber and the device arranged inside this double chamber.

The object of the present invention is to provide a shield excavation device of the type mentioned at the beginning, in which the expansion of the shield space is no longer absolutely necessary, and the operational reliability of the system for retaining the face with liquid is increased, and The aim is to construct the structure in such a way that overall construction costs are reduced.

The above-mentioned problem is solved by the present invention, in which the pressure reservoir is formed by a series of pressure reservoirs that does not rely on a shield of pressure reservoirs and has a common flexible supply conduit for the accumulated liquid. The invention is solved by the fact that each of the vessels of the series of pressure storage vessels can be connected and disconnected individually.

The expression "independent of shielding" mentioned above means the following. This means that the pressure reservoir is not formed by a partition wall or the like fixedly built into the shield, but can be installed in a tunnel or the like at any position within the shield or advantageously at any position behind the shield. means consisting of a separate container provided within.

The invention significantly simplifies the system required for liquid mounding of the face and the entire shield excavation equipment associated therewith. Only one partition needs to be provided in the shield, which separates the cutting chamber on the face side from the shield chamber at the rear. The pressure reservoir can be provided at any location within the shield or behind the shield where it does not interfere with excavation operations within the mine shaft.

Since the drilling shear is constantly removed from the drilling chamber together with a portion of the heap liquid, the heap liquid must then be continuously replenished so that the heap is guaranteed in the liquid column over its entire height of the face. . It is advantageous to provide a separate supply device for supplying fresh liquid. In this case, the pressure storage container balances out the pressure of the pressure liquid column inside the excavation chamber in the event that a fluctuation occurs in the pressure liquid column.

Furthermore, it is advantageous to connect a number of pressure reservoirs to the excavation chamber in the bottom area via conduits that communicate with the excavation chamber.

The pressure storage container is designed to be airtight even when the gas pressure is high, so that no sealing problem occurs.

In accordance with the present invention, all pressure reservoirs in a bank are connected to the shield's excavation chamber via a common flexible pressure conduit, such that each pressure reservoir is connected via its own conduit. Not only is the construction cost significantly reduced compared to an arrangement connected to the excavation chamber, but also, in particular, a single conduit with a relatively large cross section requires significantly less flow than multiple conduits with a smaller cross section. Enable loss. Moreover,
Flow losses in the supply of heap fluid into the drilling chamber signify the rate of pressure equalization. In the event of a sudden drop in pressure in the drilling chamber, fresh mountain fluid is introduced into the drilling chamber from the pressure reservoir via a common flexible pressure conduit so that pressure equilibrium is quickly achieved again. is important.

Being able to connect and disconnect a series of connected pressure storage vessels each time makes it possible, for example, to perform excavation in a ground with significant underground permeability.
Adaptation of the pressure storage containers of the container rows to the respective requirements of the container rows, which change completely during the course of the shield excavation, if the work is subsequently carried out in a ground with only a slight underground permeability or outside the underground permeability zone. is allowed. Furthermore, with the above configuration, each container in the row can be
For example, it can be temporarily shut off for maintenance.

The invention will be explained in more detail below with reference to embodiments illustrated in the accompanying drawings.

The illustrated shield excavation device is the excavation shield 10.
It is equipped with The end face of this excavation shield facing the face 11 is formed as a blade 12 as is known in the art. The shield is propelled in the excavation direction V onto the erected shoring, for example by means of a hydraulic jack 13, which is supported on the tubing shoring 14.

The interior of the shield 10 is separated by a partition wall 15. The space between the face and this bulkhead 15 forms an excavation chamber 16 in which an excavator 17 configured as a full-section excavator is accommodated. This excavator is adjustable with respect to the direction of the face 11 by means of an excavation cylinder 18.

The excavation chamber 16 is separated from a rear shield chamber by a partition wall 15. To support the face 11, the excavation chamber 16 is filled with heap liquid. The water used as the heaping liquid has fillers, such as bentonite, added to it to increase its heaping action. The supply of this residual liquid takes place via a conduit 23. This conduit passes through the bulkhead 15 and into the excavation chamber 16.
It is open in the lower range of the inside. A suction conduit 19 for discharging shear is located at the rear of the excavation chamber 16.
For example, it is connected to a pump (not shown).

The liquid column present in the excavation chamber 16 is under pressure of pressurized gas contained in the pressure reservoir 20 . The pressure storage container 20 forms a prestorage container for the liquid (water) 21, which is maintained under the desired pressure by a pressure cushion present in the top space 22 of the container. The pressure storage chamber 20 is connected on its underside to the excavation chamber 16 in the bottom region via a pipe or hose line 23 passing through the partition wall 15 . The excavation chamber 16 and the pressure reservoir 20 are therefore always in communication according to the pipe principle.

The shear excavated during the excavation operation is pumped out of the excavation chamber 16 as mud or otherwise removed. The amount of water carried out at this time is the supply conduit 2.
Compensated through 3. If a fluctuation occurs in the pressure liquid column inside the excavation chamber 16, this means that the liquid present in the pressure storage container 20 will be pumped into the excavation chamber 16 via the conduit 23 under the action of gas pressure. Balanced by

Particularly in the case of large diameter shields, a number of pressure reservoir vessels - designated 20' - are combined into a series of vessels and each connected to a common conduit 23. Advantageously, the row of pressure reservoirs is provided on a slide or a carriage which can be moved in the digging direction V along with the shield 10. Furthermore, an array of pressure reservoirs can be provided in the shaft at any suitable location within the shield or behind the shield.

An overpressure can be created in the filling section of the drilling chamber over the gas pressure in the multiple pressure reservoirs.
A sludge consisting of water and a bulking agent, especially bentonite, can also be used as the liquid.

[Brief explanation of the drawing]

The drawing shows one embodiment of the excavation device according to the present invention. The symbols in the figure are 16...excavation chamber, 20...pressure storage container, 23...conduit.

Claims (1)

[Claims] 1. The excavation chamber is provided with a compartment separated from the shielded space at the rear of the excavation chamber, and the excavation chamber has an adjustable air pressure for pressurizing the mountain liquid present in the excavation chamber. It communicates via a conduit with a pressure reservoir containing the underlying mountain liquid, and the excavated earth and sand are hydraulically conveyed from the excavation chamber. In a shield excavation device that performs work while retaining liquid, the pressure reservoir chamber is formed by one row of pressure reservoir containers independent of the shield, consisting of pressure reservoir containers 20, and a common flexible structure for retaining liquid in the mountain. A shield excavation device, characterized in that it is connected to the excavation chamber 16 via a supply conduit 23, and that each of the containers of the pressure reservoir row can be individually connected and disconnected. 2. Shield excavation device according to claim 1, wherein the conduits 23 connecting the plurality of pressure reservoirs 20 with the excavation chamber 16 open into the excavation chamber in the bottom region.