JPH0312199B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a pressure shield propulsion method.

``Prior art'' Conventionally, a propulsion pipe is provided with a bulkhead facing the face, an excavation chamber is formed between the face and the bulkhead, muddy water is forced into the excavation chamber, the face surface is held by the pressure of the muddy water, and the face surface is held. A method of excavating the face using a rotating blade in the excavation chamber was developed, but if there was a layer of coarse gravel underground, it would be difficult to remove the coarse gravel from the bulkhead.
Tunnel excavation within the coarse gravel layer was difficult. Therefore, a double bulkhead was installed in the propulsion pipe, and the top and bottom of the double bulkhead were separated by a horizontal wall, and a manhole with a cover was installed on the side wall. A person enters the work chamber through the manhole, carries out the coarse gravel to the air lock chamber, closes the manhole cover, and carries out the coarse gravel from the air lock chamber to the rear of the propulsion pipe, thereby cleaning the work chamber and face surface. A construction method was developed to maintain earth pressure and prevent collapse of the face (Special Publication No. 53-37653).

However, since the above-mentioned construction method uses a submerged box construction method, the equipment is complicated and the diameter of the propulsion tube is large.Therefore, there are problems in that the work efficiency is low and it is difficult to use the shield propulsion method with a relatively small diameter.

``Problems to be Solved by the Invention'' An object of the present invention is to provide a pressure shield propulsion method that can efficiently propel a coarse gravel layer with a simple device even in a relatively small-diameter shield propulsion method.

"Means for Solving the Problems" In order to achieve the above object, the present invention supports the propulsion pipe 3 at the tip of the tunnel 2, which has a pneumatic lock chamber 17 provided at the rear of the pneumatic working chamber 16, and While sending highly concentrated muddy water into the excavation chamber 8 formed between the partition wall 5 and the face 7 provided at the tip of the face, excavated earth and sand from the face are mixed with the muddy water, and the propulsion pipe 3 is propelled by the hydraulic jack 32 for propulsion. The mixed mud 37 of excavated earth and sand at the face and the muddy water is pumped into the pressurized air work chamber 16 from the opening of the mud removal pipe 13 provided upward or diagonally upward from the lower part of the partition wall 5. A pressurized air shield propulsion method characterized by an action of discharging the mud into the working chamber 16, and supporting the face through the muddy water in the excavation chamber 8 from the opening of the mud removal pipe 13 by the pressurized air in the working chamber 16. Consisting of:

"Function" Therefore, the electric motor 30 is operated to rotate the face cutter 6, and the propulsion hydraulic jack 32 pushes the propulsion pipe 3 forward to excavate the face 7 and also to remove the mud from the mud feeding pipe 12 to the excavation chamber 8. Highly concentrated muddy water is pumped into the tank.
In this way, the inside of the excavation chamber 8 is filled with a mixed mud 37 of excavated earth and sand and the muddy water, and the mud is discharged from the mud drainage pipe 13 into the pressurized air work chamber 16, and the gravel 38 is carried out. By means of the car 21, the sludge 37 is conveyed out of the mine via a discharge pipe 26 by a suitable conveyance device. In this state, the pressure inside the working chamber 16 applies earth pressure from the opening of the mud removal pipe 13 to the surface of the soft face 7 through the mud 37, thereby supporting the face 7. It is. By adjusting the pressure of the pressurized air in the working chamber 16 or the propulsion speed of the propulsion pipe 3, the discharge amount of the highly concentrated mud water is maintained at an appropriate level. The mud 3 stored in the mud storage tank 15
Between the ground and the ground after the propulsion pipe 3 has propelled a part of 7.
The sludge 37 in the tank 15 may be discharged by the pressurized air in the working chamber 16 or the differential pressure provided by the vacuum container.

``Example'' At the tip of a tunnel 2 whose inner wall 1 is formed of a segment, a fume pipe, an iron pipe, etc., the rear end of the propulsion tube 3 is slidably fitted to the outer periphery of the inner wall 1, and tail packing is performed. Seal by 4. A partition wall 5 is provided at the tip of this propulsion tube 3, and the partition wall 5
Cross-shaped or 2 to 8 airfoil face cutters 6 at the front of the
will be established. The face cutter 6 is in contact with the face 7, and an excavation chamber 8 can be held between the face 7 and the partition wall 5. That is, the rotating ring 10 is fitted between the outer circumference of the partition wall 5 and the inner circumference of the propulsion tube 3 via the seal 9,
By providing the face cutter 6 at the tip of the arm 11 provided on the ring 10, a distance is maintained between the face 7 in contact with the blade surface of the cutter 6 and the partition wall 5,
This space is used as an excavation chamber 8. Partition wall 5
A mud feeding pipe 12 is installed in the center of the partition wall 5 and extends from the rear of the partition wall 5 into the excavation chamber 8 and opens into the excavation chamber 8. A mud storage tank 15 is provided in the working chamber 16 below the upper end opening of the pipe 13 with a screen 14 interposed therebetween. The working chamber 16 is a pressurized air chamber provided between the air lock chamber 17 and the partition wall 5 at the rear thereof, and is connected to the air pipe 1.
8 and its control valve 19 to increase the indoor air pressure to form a pressurized air work chamber 16. In the figure, 20 indicates a gravel conveyor, 21 indicates an earth truck, and 22 indicates a working room 16 and a pneumatic lock chamber 1.
7 is a pressure air wall, 23 is a pressure air door, 24 is a pressure air door with outside air, 25 is a backfill injection material, 26 is a rail, 27 is a discharge pipe connected to the mud storage tank 15, 27' is a control valve, 2
8 is an internal gear provided inside the rotation ring 10, 29 is a drive pinion that meshes with the internal gear 28, 30 is an electric motor for rotating the pinion 29, 31 is a bearing, 3
3 is a vacuum container, 34 is a vacuum pump, 35 is an air suction pipe, and 36 is an earth pressure gauge.

"Effects of the Invention" Since the present invention is based on the above-mentioned construction method, the mud 37 in the excavation chamber 8 necessary for stabilizing the face surface is
The pressure is obtained by the atmospheric pressure in the working chamber 16,
Since the balance can be maintained, there is no need to provide any control mechanism for the mud removal pipe 13, and since the mud material 37 in the excavation chamber 8 is liquid, it is not necessary to propel the propulsion pipe 3 or to reduce the atmospheric pressure in the working chamber 16. By lowering the mud a little, it can be easily discharged through the mud removal pipe 13, and since this muddy material 37 has a high specific gravity, the gravel 38
Since the sludge is in a floating state, it can be easily discharged from the sludge pipe 13 along with the sludge 37. Therefore, there is no need to provide any transport mechanism (screw conveyor, etc.) to the mud removal pipe 13, and coarse gravel 38 of a size up to the inner diameter of the mud removal pipe 13 can be discharged, which was previously considered difficult. This enables tunnel excavation through coarse gravel layers to be carried out easily and economically at low cost.

[Brief explanation of the drawing]

Figure 1 is a side view showing the pressure shield propulsion method of the present invention, Figure 2 is a front view taken along line A-A in Figure 1,
FIG. 3 is a front view taken along line BB in FIG. 1, and FIG. 4 is an overall view. 2... Tunnel, 3... Propulsion tube, 5... Bulkhead,
7... Face, 8... Excavation room, 13... Sludge removal pipe, 1
6... Pressurized air work chamber, 17... Air lock chamber, 32... Hydraulic jack for propulsion, 37... Mixed mud.

Claims (1)

[Claims] 1. A propulsion pipe 3 is supported at the tip of a tunnel 2 in which an air lock chamber 17 is provided at the rear of a pressurized air working chamber 16, and a partition wall 5 and a face 7 provided at the tip of the tube 3 are provided. While sending highly concentrated muddy water into the excavation chamber 8 formed during the process, the excavated face soil is mixed with the muddy water, the propulsion pipe 3 is propelled by the propulsion hydraulic jack 32, and the excavated face soil and the muddy water are mixed. The mixed mud 37 is transferred to the partition wall 5
The pressurized air working chamber 16 is discharged from the opening of the mud removal pipe 13 provided upwardly or diagonally upwardly from the lower part of the
A pressurized air shield propulsion method characterized by an action of discharging the mud into the working chamber 16, and supporting the face through the muddy water in the excavation chamber 8 from the opening of the mud removal pipe 13 by the pressurized air in the working chamber 16. . 2. The pressure shield propulsion method according to claim 1, wherein the mixture of earth, sand, and muddy water in the excavation chamber 8 is in a plastic state. 3. The pressure air shield propulsion method according to claim 1, wherein the earth, sand and muddy water mixture in the excavation chamber 8 is in a liquid state.