JPS5925996Y2 - Conveyance device for shield tunneling machine - Google Patents

Description

[Detailed description of the invention] This invention relates to a transport device for earth removal that is installed in a shield excavator for tunnel construction, and is particularly suitable for a shield excavator for excavating strata with high permeability such as gravel layers. The present invention relates to a conveyance device configured as follows.

In conventional shield excavators, there are two methods for removing earth: one is fluid transport using muddy water, and the other is a screw conveyor with a face water pressure balancing function. There are many problems with earthen methods as well.

That is, in a muddy shield excavator that removes soil by transporting fluid, as shown in FIG. A muddy water circulation cycle configuration is adopted in which muddy water is introduced into the cutter chamber 2 through a muddy water return pipe 7 and then returned to the cutter chamber 2 by a pump 6.

In such a mud water circulation cycle, the pipe diameter of the debris pipe 4 is set to several times the estimated maximum gravel diameter contained in the mud water, and the mud water flow rate within the debris pipe 4 is set to be equal to the gravel settling rate. Since the speed must be higher than the required speed due to the relationship between

For this reason, a large amount of muddy water always flows inside the cutter chamber 2, and the flowing water causes a scouring phenomenon of the face, forcing the collapse of the face ground.

Particularly in areas with multiple gravel layers, the gravel separator 5 becomes full of debris in a short period of time, so the machine must be stopped many times during shield excavation to take out the gravel from the gravel separator 5. However, it took a considerable amount of time and effort to remove it, resulting in delays in tunnel excavation work.

In addition, the debris pipe 4 was sometimes clogged with gravel.

On the other hand, in a shield excavator that removes earth using a screw conveyor, as shown in Fig.
By applying water pressure at the face inside the screw casing 9 and sending pressurized air through the air supply pipe 10 into the screw casing 9 of the screw conveyor 8 whose inlet is communicated with the lower part of the inside of the cutter chamber 2, the water pressure at the face can be applied to the inside of the screw casing 9. The screw conveyor 8 is balanced in the middle and the transfer end side of the screw conveyor 8 extends diagonally above the balance surface VL.

For this reason, the screw conveyor 8 must be installed diagonally, and due to the above-mentioned major restrictions, the screw conveyor's cross-sectional area is also limited, resulting in a decrease in soil removal capacity. was also forced.

Furthermore, although the screw conveyor 8 tilted in this manner can transport large debris such as gravel and clods, the fine debris contained therein is separated during conveyance and is transferred to the lower end of the sloping screw casing 9. It becomes impossible to carry out as it settles.

For this reason, it is necessary to connect the sludge removal pipe 11 to the inclined lower part of the screw casing 9 of the screw conveyor 8 for fluidly transporting fine sludge using muddy water, and the auxiliary equipment of the screw conveyor 8 is large-scale. It became.

This idea was devised to solve the above-mentioned problems, and its purpose was to prevent the waste removal system from becoming clogged with gravel, etc., and to avoid having to stop the machine many times during shield-excavation. Even if there is a large amount of waste, it can be transported smoothly, reliably, and efficiently at all times using automatic mechanical means, and installation is not restricted by the location or cross-sectional area of the screw casing, and it can be carried out on the face ground. It is an object of the present invention to provide a conveyance device for a shield excavator having a structure capable of preventing collapse due to a scouring phenomenon.

An embodiment of this invention will be described below with reference to FIGS. 3 to 5.

In FIG. 3, a pedestal 13 disposed near the opening side of the tip of the skin plate 12 connects the cutter 1 through a bearing 14.
5 is held rotatably.

The cutter 15 has a cutter chamber 18 whose rear end opening is opened by a partition wall 17 through a seal 16, and the inner and outer circumferences of the cutter chamber 18 form a plurality of packets with partition plates 18'. It is designed to be rotationally driven by a motor 19.

In the cutter 15, pressurized mud water is fed into the cutter chamber 18 through a mud water pipe 20 opened toward the upper side of the partition wall 17, and the pumped pressurized mud water is used to prevent underground water from entering the cutter chamber 18. It's meant to be balanced.

Further, in the cutter chamber 18, the transfer start end side of the waste removal conveyance device 21 faces approximately at the center, and its configuration will be explained below.

That is, the conveying device 21 has a screw conveyor configuration as shown in FIG. The offshore part is partitioned off from the discharge part 24 by an inclined partition wall 25.

Therefore, the inside of the casing 22 is divided into an inlet side transfer path 26 and an unloading side transfer path 27 by the inclined partition wall 25, and the peripheral wall of the casing 22 near the boundary between the two sections includes:
A downward opening 28 communicating with the carry-in side transfer path 26 and an upward opening 29 communicating with the carry-out side transfer path 27 are provided at symmetrical positions.

In such a casing 22, an annular packet 30 is rotatably fitted through a sealing element 31 into an outer peripheral wall having a downward opening 28 and an upward opening 29 at symmetrical positions.

As shown in FIG. 5, the annular bucket 30 has its interior divided by partition plates 32 at regular intervals along the circumferential direction, so that the inner side in the radial direction is open and a plurality of adjacent packet chambers 3 are formed.
A guide roller 33.0a to 30f is attached to the outer peripheral surface of the guide roller 33.
As shown in FIGS. 3 and 4, a coaxial driven gear 36 mounted on one side wall is meshed with the output gear 35 of the motor 34.
4, each of the packet chambers 301 to 30f opens into a downward opening 28 and an upward opening 29.
It is arranged to communicate with each of them in turn.

At the axial center of the casing 22 equipped with such an annular packet 30, there is a screw shaft 37 that closely penetrates the inclined partition wall 25.
is rotatably attached, and this screw shaft 37 has an inlet side screw blade 37a and an unloading side screw shaft 37b.
It has an integral part and is rotationally driven by a motor 38.

Further, a waste discharge device 39 is connected to the discharge portion 24 of the casing 22, and a belt conveyor 40 for carrying out waste is arranged at the lower part thereof as shown in FIG.

An air supply pipe 42 is connected to the terminal end of the discharge side transfer path 27.

Next, the operation of the above embodiment will be explained.

First, mud water is supplied into the cutter chamber 18 through the mud water pipe 20 to fill the chamber with water corresponding to the face water pressure, and
By feeding air with a pressure equivalent to the face water pressure into the transport path 27 on the transport side of the casing 22 through the air supply pipe 42, the sewage flowing from the cutter chamber 18 into the transport path 26 on the transport side of the casing 22 is separated from the wastewater on the transport side. A downward opening 28 that communicates the pressurized air in the transfer path 27 to the carry-in side transfer path 26.
The balance is made on the VL plane in FIG. 5, which is approximately in the middle of the upward opening 29 communicating with the discharge-side transfer path 27.

In this state, the cutter 15 is rotated by the motor 19 and simultaneously propelled by a propulsion jack (not shown), so that the cutter 15 starts excavating a tunnel.

At this time, by starting the motor 38 of the screw shaft 37 and the motor 34 of the annular bucket 30, the cutter chamber 18 is excavated by the cutter 15.
The waste introduced into the cutter chamber 18 is dropped into the introduction port 23 of the casing 22 by the packet inside the cutter chamber 18.

The waste that has flowed into the carry-in side transfer path 26 is transported to near the inclined partition wall 25 by the carry-in side screw blades 37 a, and then is transferred from the downward opening 28 to the rotating annular bucket) 3
0 packet chambers 303 to 30f.

The debris that fell into the packet chambers 30a to 30f sequentially is
When those packet chambers 30 a to 30 f are displaced by approximately 180 degrees from the communication position with the downward opening 28 of the muddy water by the rotational operation of the annular packet 30, passing through the balance surface VL of the muddy water and the pressure air. Since it communicates with the upward opening 29 under pressure, it falls from this upward opening 29 into the discharge-side transfer path 27 .

The waste in the delivery-side transfer path 27 is then transferred to the discharge section 24 by the delivery-side screw blade 37b, and then transported to a predetermined collection section by the belt conveyor 40 via the waste delivery device 39.

In the above embodiment, the cutter 15 and the annular packet 30 are driven separately by individual motors 19 and 34, but the cutter 15 is integrated with the annular packet 30 as shown in FIG. circular packet 3
0 motors 34 may be used to drive the rotation at the same time.

Further, the conveyance device 21 may have a plurality of screw shafts 37, and the conveyance device 21 is not necessarily limited to a screw conveyor configuration.

As explained above, this device mechanically transfers the waste introduced into the carry-in transfer path to the carry-out transfer path, which is separated from the carry-in transfer path, using a rotating annular packet. Because of this structure, even if employees are engaged in debris removal work associated with shield excavation in a multi-gravel area, the debris transport system will not be clogged with debris, as in the case of conventional debris removal using fluid transfer. , Shield - Gravel-containing waste can be carried out smoothly, continuously and efficiently at all times without having to stop the machine many times during excavation.

In addition, according to the conveyance device of this invention, water pressure of about 7 to balance the face water pressure can be applied to the cutter chamber of the shield excavator unlike in the case of removing waste by fluid transfer, so the amount of water used can be reduced. Moreover, it is possible to prevent collapse due to the scouring phenomenon of the rock face.

Furthermore, in this invention, as mentioned above, the waste that was transferred laterally in the transfer path on the carry-in side is transferred vertically in an annular packet, and then transferred laterally again in the transfer path on the discharge side, so that the rear end of the conventional screw conveyor is Installations that must be installed diagonally, such as screw conveyors that are installed on pressurized shield tunneling machines, are not subject to the above restrictions, and can be installed either in an inclined or horizontal position. In addition, the cross-sectional area of the casing is not limited by the balance position of supply pressure and water pressure.

Coupled with the above, the conveyance device of this invention uses a rotating annular packet to drain the waste during transport, making it possible to reliably transport not only gravel and clods but also fine waste. The effect is most noticeable when the shield is installed in different locations.

[Brief explanation of drawings]

Figures 1 and 2 are explanatory diagrams showing different conventional earth removal devices for shield tunneling machines, and Figure 3 shows a state in which a conveyance device according to an embodiment of this invention is incorporated into a shield tunneling machine. 4 is an enlarged sectional view of the conveying device, FIG. 5 is a sectional view taken along the line v--V in FIG. 4, and FIG. 6 is an explanatory view of a modification of this invention. In the figure, 21 is a conveyance device, 22 is a casing, 23 is an inlet, 24 is a discharge part, 26 is a carry-in side transfer path, 27 is a carry-out side transfer path, 28 is a downward opening, 29 is an upward opening, 30 is an annular packet, 30a to 30f are packet chambers, 34 is a motor as an annular packet rotation driving means, and 37 is a conveyor.

Claims (1)

[Scope of utility model registration request] The interior is divided into an inlet-side transfer path and an unload-side transfer path, with an inlet for conveyed objects on the transfer start side and a discharge port on the transfer end side, and a carry-in side transfer path on the peripheral wall near the division boundary. The casing has a downward opening communicating with the transport path and an upward opening communicating with the discharge transfer path, and a plurality of compartments adjacent to each other along the circumferential direction and each having an opening on the inside in the radial direction. and is rotatably attached to cover an upward opening and a downward opening on the outer periphery of the casing, so that the compartment chambers are successively and individually communicated with these upward openings and downward openings. 1. A conveyance device for a shield excavator, comprising an annular packet, a means for rotationally driving the annular packet, and a screw conveyor provided on the same axis as the carry-in side transfer path and the carry-out side transfer path.