JPH0366898A - Earth and sand removal method and soil improvement device in shield construction method - Google Patents

Abstract

PURPOSE:To enhance the efficiency of transporting soil and sand by conveying the excavated soil and sand to a soil quality modifying device via a soil exhaust device. and carrying out the soil and sand to outside the pit while they are being modified. CONSTITUTION:Though a ribbon screw 2 the excavated soil and sand are together with gigantic stones cast into a ribbon screw type mixer 9 of a soil quality modifying device 3, and sent to the exhaust hole 9d by another ribbon screw 9b. Upon receiving a signal from a soil amount sensor 10, a pouring pump control device 14 decides the pouring amount of the modifying agent and controls a pouring pump 12, and the soil quality modifying agent in a soil modifying agent storage tank 11 is poured into a soil/sand receptacle hopper 18 via a pouring pipe 13. Thus the soil quality is modified. Thereby the soil and sand are changed from hedro form into plastic state, which should enhance the efficiency of conveyance.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for transporting earth and sand in the shield method and a soil improvement device.

(Conventional technology) When attempting to improve the soil quality of muddy excavated soil using the slurry shield method, the soil quality has traditionally been improved outside the mine using paddles or screw conveyors, or heavy construction equipment such as backhoes. No soil improvement was carried out at the face.

(Problems to be Solved by the Invention) Conventionally, soil improvement equipment mixes soil improvement agents into excavated soil by rotating stirring blades or augers, so as in the ribbon screw type slurry shield method,
It was not possible to mix excavated soil containing boulders with particle sizes of 300 to 400 n+m.

In addition, since such a 7-combination device is installed outside the mine or inside the shaft, the excavated soil must be poured underground in the form of mud, and when transported by trolley, there is a risk of overflow. In order to prevent this, it is necessary to reduce the amount of transport per vehicle, and i! l! Transport efficiency Furnace efficiency.

The present invention has been proposed in view of the problems of the prior art, and its purpose is to improve the soil quality immediately after the excavated soil is removed by a shield excavator, and to improve the soil transport and remaining soil. The object of the present invention is to provide a method for transporting earth and sand in the shield method and a soil improvement device that can improve the efficiency of disposal.

(Means for Solving the Problems) In order to achieve the above object, in the earth and sand removal method in the shield construction method according to the present invention, a soil improvement device is connected to the earth removal device of the shield excavator, and the soil improvement device is connected to the earth removal device of the shield excavator. The excavated soil is sent to the soil improvement device via the earth removal device, and is transported out of the tunnel while the soil quality of the excavated soil is improved by the device.

In addition, the soil improvement device for the shield construction method according to the present invention includes a ribbon screw type mixing section equipped with a soil receiving hopper at the front end, each installed on an underground truck, a soil improvement agent storage tank, and a soil improvement agent storage tank connected to the tank. an injection pump connected to the pump and supplying the soil conditioner to the hopper, a soil amount detection sensor disposed between the trolley and the ribbon screw type mixing section, and a detection signal of the sensor. and an injection pump control device that controls the amount of soil conditioner to be injected into the hopper in response to the received soil conditioner.

(Function) According to the method of the present invention, immediately after the soil excavated at the face by the shield excavator is discharged by the soil removal device, the soil quality is improved by the soil improvement device connected to the soil removal device, and the soil changes from sludge-like to plastic. It is transformed into sand and earth, transported through the mine, and then taken out of the mine.

According to the apparatus of the present invention, the weight of the ribbon screw-type mixing section installed on the underground truck is reduced as excavated soil containing boulders is fed into the mixing section via the sand receiving hopper. The change is detected by the soil amount detection sensor, and the injection pump is controlled by the injection pump control device that receives the detection signal from the sensor, and the pump pumps a predetermined amount of the soil conditioner from the soil conditioner storage tank. The excavated soil is supplied to a hopper, and the soil quality of the excavated soil is improved from sludge-like to plastic-like soil, and the excavated soil is conveyed inside the mine and carried out outside the mine.

(Example) The present invention will be described below with reference to the illustrated embodiments.

In Fig. 1, (1) is a shield excavator, and (2) is a ribbon screw that constitutes a device for removing excavated earth and sand from the face.
A soil improvement device (3), which will be described later, is installed immediately after the soil discharge port of the ribbon screw (2).

Immediately after the soil improvement device (3), a belt conveyor (4) constituting the earth and sand loading device is installed.
The earth and sand discharged from the soil improvement device (3) via the trolley (4) that runs inside the shield tunnel (5)
6).

Figures 3 to 6 show an embodiment of the soil improvement device (3), in which a soil receiving hopper (8) is mounted on an underground truck (7).
A ribbon screw type mixing section (9) having a
0) is provided.

The ribbon screw type mixing part (9) has a ribbon screw (9b) without a central axis disposed in an outer cylinder (9a),
It is configured to be driven and rotated by a drive motor (9c) mounted on an outer cylinder (9a). In the figure (9d)
is the improved soil outlet. The ribbon screw (9b)
The surface of the
As shown in the figure, small protrusions (9e) are provided so as to increase the mixing effect of the soil conditioner and the excavated soil.

The trolley (7) is equipped with a soil conditioner storage tank (11) and a soil conditioner injection pump 02) connected to the tank (It), and the pump 02) is equipped with the hopper (
An injection pipe 03) for supplying a soil conditioner is connected to 8).

Further, the truck (7) is equipped with the soil amount detection sensor 00).
An injection pump control device 0 is provided which receives the detection signal and controls the amount of soil conditioner injected by the pump 02).

Since the illustrated embodiment is configured as described above, the soil excavated by the shield excavator (1) is transferred together with the gravel through the ribbon screw (2) to the ribbon screw type mixing section (3) in the soil improvement device (3). 9) through the earth and sand receiving hopper (8) at its front end, and is sent to the discharge port (9d) by the ribbon screw (9b).

During this time, the polymeric or cement-based soil conditioner in the soil conditioner storage tank (11) is injected into the soil receiving hopper 0 through the injection pipe 03) by the injection pump 02), and the soil conditioner is mixed with the excavated soil. Sent while being mixed and stirred,
The soil quality of the excavated soil will be improved.

At this time, in response to the detection signal of the soil volume in the ribbon screw type mixer (9) from the soil volume detection sensor Go), the injection pump control device 0 determines the injection amount of the soil conditioner,
Control the infusion pump 02). When the input and discharge of excavated soil into and out of the mixer (9) reaches a steady state, the amount of soil per unit time is calculated from the number of rotations of the ribbon screw (9b), and the soil conditioner is added.

In addition, since the mixer (9) is equipped with a ribbon screw (9b) without a central shaft, even if one gravel is contained in the excavated soil, it can be mixed and stirred with the soil conditioner without any problem. .

In this way, the sand discharged from the shield excavator (1) whose soil quality has been improved by the soil quality improvement bag J (3) is changed from sludge-like to plastic-like earth and sand, and is transferred to the trolley (6) via the belt conveyor (4). It was loaded into the mine and placed on a seamount outside the mine.

The embodiment shown in Fig. 1 shows a case where the tunnel diameter is relatively large, and the ribbon screw (2) of the shield excavator (1)
A soil improvement device is installed immediately after the soil discharge port of the shield excavator (1), but if the tunnel diameter is small, the soil improvement device (3) and the soil discharge port of the shield excavator (1) are installed as shown in Figure 2. A heald conveyor (4) is installed in the middle of the conveyor belt.

(Effects of the Invention) According to the present invention, as described above, a soil improvement device is connected to the earth removal device of the shield excavator, and the soil excavated by the shield excavator is transferred to the soil improvement device through the earth removal device. The equipment will improve the excavated soil inside the mine and efficiently transport it outside the mine. The soil improved in this way becomes soil that can be compacted as is, and has the potential to be effectively used as fill soil in the future.

The invention according to claim 2 provides a ribbon screw-type mixing unit equipped with an earth and sand receiving hopper at the front end, which is installed on an underground truck, to transport the soil excavated by the shield excavator rearward while stirring it, and The soil conditioner is injected from the soil conditioner storage tank mounted on the same truck through the injection pipe using the injection pump installed above, and is stirred and mixed with the excavated soil to improve the soil quality of the excavated soil. By improving the soil and changing it from sludge-like to plastic-like soil, it is possible to significantly improve underground transportation efficiency and residual soil disposal efficiency.

Furthermore, as described above, by using a ribbon screw type mixer without a central shaft, it is possible to continuously improve the soil quality of excavated soil containing one gravel, and it is also easy to separate the soil and gravel.

Furthermore, an injection pump for injecting a soil conditioner into the ribbon screw type mixer is interposed between the trolley and the ribbon screw type mixer, and an injection pump for detecting the amount of soil in the mixer. Since it is controlled by an injection pump control device that operates in response to a detection signal from a detection sensor, an appropriate amount of soil conditioner is always injected, and the soil condition of the excavated soil is effectively improved.

[Brief explanation of drawings]

1 and 2 are vertical side views showing the implementation status of each embodiment of the earth and sand transport method in the shield construction method according to the present invention, and FIG. 3 is a vertical side view showing an example of the soil improvement device, and FIG. FIG. 4 is a perspective view of the ribbon screw, FIG. 5 is a perspective view showing the peak portion thereof, and FIGS. 6 and 7 are partial perspective views of the ribbon screw. (1)...Shield excavator, (2)...Ribbon screw, (3)...Soil improvement device, (5)...
・Shield tunnel, (7)...Underground truck,
(8)... Sediment receiving hopper (9)... Ribbon screw type mixing section, 00)... Soil amount detection sensor (11)... Soil conditioner storage tank, q... Injection pump, 0 turbidity...injection tube, 0(1)...injection pump control device.

Claims (1)

[Claims] 1. A soil improvement device is connected to the earth removal device of the shield excavator, and the soil excavated by the shield excavator is delivered to the soil improvement device via the earth removal device, and A method for transporting earth and sand in a shield construction method, characterized in that the earth and sand is transported outside a tunnel while improving the soil quality of the excavated earth. 2. A ribbon screw type mixing section equipped with a soil receiving hopper at the front end, each installed on an underground truck, a soil conditioner storage tank, and an injection pump connected to the tank;
An injection pipe that is connected to the pump and supplies the soil conditioner to the hopper, and a soil amount detection sensor that is disposed between the trolley and the ribbon screw type mixing section; 1. A soil improvement device for a shield construction method, comprising an injection pump control device for controlling the amount of soil improvement agent injected into the soil.