JP2528025B2 - Tunnel excavation Sediment transportation method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for transporting earth and sand excavated by tunnel construction to the outside of a mine, and more particularly to a method for conveying earth and sand excavated by a shield method.

(Prior Art) As a shield construction method, there are various construction methods conventionally.
For example, the muddy water shield method, muddy water semi-shield method, earth pressure method and the like are well known. Then, in these shield construction methods, the transportation of excavated sediment to the outside of the mine is different in each of the construction methods described above, for example, in the mud shield or mud semi-shield construction method, a method of transporting excavated sediment with mud through a mud pipe is used. In the pressure method, each method was used in which the material was once discharged on a screw conveyor and then transported using trolleys.

(Problems to be solved by the invention) By the way, in urban areas, underground extension of buildings and multipurpose use of tunnels are being actively promoted from the viewpoint of effective use of land, and along with this, the tunnels themselves However, there is a tendency to increase the depth and the diameter.

However, when a tunnel construction with a large depth and a large diameter is targeted in this way, according to the sediment transport method in the conventional shield construction method, the transport capacity is, for example, exclusively in the mud shield or mud semi shield construction method. Since it depends on the capacity of the mud pump and the number of trolleys installed in the earth pressure method, it is necessary to install a large number of large mud pumps and trolleys, resulting in a significant increase in equipment costs and operating costs. There was an unavoidable problem. In addition, especially in the shield method, segments are added every time a predetermined distance is dug, but the installation of a large number of large sludge pumps and trucks causes the working space in the mine to be narrowed, which also reduces the efficiency of construction. there were.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a tunnel excavation sediment transport method capable of increasing the sediment transport capacity without particularly increasing the size of equipment. .

(Means for Solving the Problems) In order to solve the above problems, the present invention supplies the air taken in from the upper part of the mine into the sludge pipe connecting the mine and the mine,
It is characterized in that the excavated earth and sand are transported to the outside of the mine by utilizing the propulsive force of the air.

As a method for transporting earth and sand by using the propulsive force of fluid, a method using an air ejector or an air lift has been conventionally used (for example, Corona Company "Air Machine" Chapter 9 P228, Japan Work Vessel Association "Work Vessel" No. 104, March 1976, P15, etc.) or a method of mixing air into a water jet (see, for example, JP-A-52-18206). The present invention was made by focusing on the propulsive force of air,
It is characterized by positively utilizing the mine air. In the present invention, the method of supplying air to the sludge pipe is arbitrary, for example, it may be supplied as a jet stream like an air ejector, or as compressed air like an air lift, or described in the above publication. May be mixed with the water jet and supplied.

(Operation) In the method of transporting tunnel excavation sediment constituted as described above, the relatively high temperature air in the upper part of the mine supplied to the mud pipe greatly contributes to the promotion of sediment, and the excavation sediment transport capacity is enhanced. It

(Example) Hereinafter, an example of the present invention is described based on an accompanying drawing. The present embodiment shows an example applied to the muddy water shield method.

In FIG. 1, reference numeral 1 is a shield machine, which is a cylindrical main body 2 and a cutter 3 rotatably held on the front portion of the main body 2.
And a hydraulic motor 4 for rotating the cutter 3 provided in the main body 2 and a propulsion jack 5 fixed to the main body 2. Into this shield machine 1, one end of a mud pipe 6 and a mud pipe 7 extending in the already excavated side shaft (tunnel) A and shaft B is introduced, while the mud pipe 6 and the mud pipe are introduced. The other end of 7 is connected to a muddy water treatment device 8 installed on the ground. A mud pump 9 is installed in the mud pipe 6 and a plurality of mud pumps 10 are installed in the mud pipe 7. By operating these pumps 9 and 10, the mud treatment device 8 and the shield machine 1 are connected. Muddy water is transported between. The muddy water treatment device 8 has a function of separating sediment from mud containing excavated sediment, which will be described later, transported through the mud discharge pipe 7 and adjusting the specific gravity of the remaining mud. It will be pressure-fed to the shield machine 1 through the pipe 6. In addition, 11 is a segment made of reinforced concrete which is lined inside the wall of the horizontal shaft A.

In the above system configuration, the cutter 3 is rotated by the operation of the hydraulic motor 4, and the existing segment
When the jack 5 is extended with the 11 as a scaffold and the main body 1 is moved forward, the natural ground is excavated by the cutter bits 3a in front of the cutter 3. At this time, muddy water of a predetermined specific gravity is supplied to the front surface of the shield machine 1 from the muddy water treatment device 8 through the mud pipe 6, whereby an appropriate muddy water pressure is applied to the face and the ground is kept stable. . On the other hand, the earth and sand excavated by the cutter 3 are transported to the muddy water treatment device 8 through the mud discharge pipe 7 together with the muddy water. And shield machine 1
After digging a predetermined distance, the jack 5 is contracted and a new segment (divided segment) is assembled between the existing segment 11 and the existing segment 11. Next, the new segment is used as a scaffold to dig in the same manner as described above. If it repeats, the tunnel will be extended sequentially.

Therefore, in this embodiment, as shown in FIG. 2, the compressor 15 is installed in the horizontal shaft A, and the suction pipe 16 connected to the suction port of the compressor 15 is installed in the upper part of the horizontal shaft A. Prolong, meanwhile,
A discharge pipe 17 connected to the discharge port of the compressor 15 is inserted into the sludge discharge pipe 7. The tip end of the discharge pipe 17 extending into the mud discharge pipe 7 is bent in the mud flow direction a, and the tip thereof is narrowed so as to form a nozzle portion 18.

With the installation of such compressor 15, the shield machine 1 is now available.
When this compressor 15 is operated at the same time as the operation of, the hot air in the upper part of the shaft A is taken into the compressor 15 through the suction pipe 16, while the compressed air is discharged from the nozzle portion 18 of the discharge pipe 17. It is discharged into mud water containing excavated earth and sand in the mud discharge pipe 7. The air discharged to the mud discharge pipe 7 plays a role of propelling mud water, whereby the transport capacity of excavated soil is enhanced.

(Effects of the Invention) As described above in detail, according to the method for transporting tunnel excavation sediment according to the present invention, it is possible to enhance the transport capability of excavated sediment by utilizing relatively high temperature air in the upper part of the mine. Since it is possible to achieve this, there is no need for large-scale equipment for transporting sediment, and a significant reduction in transport costs can be achieved.
The effect of reducing the work space in the shield construction method and preventing a decrease in construction efficiency can be obtained. In addition, by positively taking in pollutants such as dust that easily accumulates in the upper part of the mine and discharging them to the outside of the mine, not only the temperature rise in the well is suppressed but also active ventilation becomes possible, improving the working environment. In addition, since no special ventilation equipment is required, it is possible to obtain an effect suitable for excavation of a tunnel having a large depth and a large diameter.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view schematically showing an embodiment of a method of transporting sediment according to the present invention applied to a muddy water shield method, and FIG. 2 is an enlarged view of a part thereof. FIG. 1 ... Shield machine 3 ... Cutter 6 ... Mud pipe 7 ... Mud pipe 8 ... Mud treatment device 9,10 ... Pump 15 ... Compressor 16 ... Suction pipe 17 ... Discharge pipe

Claims (1)

(57) [Claims] 1. Tunnel excavation characterized by supplying air taken in from the upper part of the mine into a sludge pipe connecting the mine and the mine, and using the propulsive force of the air to transport the excavated soil to the outside of the mine. How to transport sediment.