JPH08303187A - Shield machine - Google Patents

Abstract

PURPOSE: To maintain the accuracy of detection of pressure in a facing while smoothly discharging soil and sand in the facing by removing soil particles adhering on the front of a bulkhead parting the facing and an underground section. CONSTITUTION: A shield machine has a bulkhead 2 parting a facing and an underground section in a section immediately after a cutter head 12 in a front section. A sludge discharge opening 8 for discharging soil and sand in the facing and a pressure introducing hole for a pressure sensor are formed to the bulkhead 2 while a stop gate 3 opening and closing the sludge discharge opening 8 is mounted. The stop gate 3 consists of two gate plates rotatable centering around pins, and the gate plates are rotated by gate jacks on the rear surface side of the bulkhead 2 and the sludge discharge opening 8 is opened and closed. The pressure introducing hole is formed at a place where the gate plates are passed on the front of the hole when the stop gate 3 is opened and closed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a shield machine used for excavating tunnels such as headraces and sewers by the semi-shield construction method, and automatically removes adhering soil particles blocking mud discharge ports and pressure introduction holes. Regarding shield machine.

[0002]

2. Description of the Related Art A semi-shielding method is used in which a shield machine is used as a front conductor, and immediately after that, a tube that supports the ground is pushed in by a jack in a starting shaft in the rear to be buried while being propelled. The inner diameter of the sewer system is 0.8 to 1.2
The shield machine used for excavating a tunnel of about m holds the pressure inside the face to support the excavated ground, and therefore mud is pressed into the face ahead of the bulkhead. The mud pressed into this face mixes with the excavated earth and sand to form fluid face sediment. The earth and sand in the cutting face is introduced into the mud discharge port provided in the bulkhead, and is discharged to the rear of the excavator through the mud discharge pipe connected to the mud discharge port. In such a shield machine, conventionally, as shown in FIG. 11, during excavation, part of the earth and sand 38 in the face becomes adhered soil particles 40 to cover the front surface of the bulkhead 2 and block the inlet of the pressure introduction hole 10. , The mud discharge port 8 was narrowed. The adhering soil particles blocking the pressure introducing hole entrance prevent accurate pressure transmission to the pressure sensor at the back of the pressure introducing hole and reduce the detection accuracy of the pressure inside the face,
It adversely affects the pressure control inside the face. In addition, the sludge discharge port is narrowed by the adhered soil particles, which deteriorates the condition of the sludge discharge from the sludge discharge port, and the sludge discharge port is blocked. Occasionally, the entire construction was hindered, such as the eruption that led to the collapse.

[0003]

The problem to be solved by the present invention is to solve the above-mentioned problems and to remove the dirt particles adhering to the front surface of the bulkhead to maintain the detection accuracy of the pressure inside the face. , To provide a shield machine that enables smooth discharge of sediment in the face.

[0004]

Means for Solving the Problems The structure of the present invention which has solved the above problems is as follows: 1) A bulkhead is provided behind a cutter head for excavating the natural ground in front of a tunnel, and a bulkhead for separating a face and a pit is provided. A tunnel provided with a mud outlet connected to a mud pipe that discharges the sediment inside the face to the rear, a stop gate that opens and closes the mud outlet, and a pressure introduction hole leading to a pressure sensor for detecting the pressure inside the face. In a shield machine for excavation, two gate plates shaped to cover the left and right halves of the mud discharge port can be freely rotated within the movable range from the position where the mud discharge port is closed to the height of the pressure introduction hole. The shield machine is characterized in that it is mounted on the front surface of the bulkhead and used as a stop gate. 2) At the portions in contact with each other in the center of the two gate plates,
The shield machine according to 1), wherein each of the shield excavators is provided with an uneven meshing portion that is in close contact with each other at a position where the mud discharge port is closed.

[0005]

In the shield machine according to the present invention, when the two gate plates of the stop gate are rotated in order to discharge the earth and sand in the face from the mud discharge port, the gate plate slides on the front surface of the bulkhead to open the mud discharge port. The soil particles adhering to the front surface of the bulkhead are scraped off by opening and opening the gate plate.
The pressure introduction hole in the movable range of the gate plate also scrapes the adhering soil particles every time the gate plate is opened, avoiding blockage, and the pressure inside the face is directly transmitted to the pressure sensor in the back to maintain the pressure detection accuracy. Be done. Further, the adhered soil particles that have adhered to the edge of the sludge discharge port and narrowed the sludge discharge port are less likely to be adhered here due to removal by the gate plate, and the sludge discharge state does not change. When the stop gate is opened, the earth and sand inside the face are introduced into the mud discharge port due to the pressure difference between the face and the mine. After this, it passes through the inside of the mud pipe connecting the mud discharge port and the rear of the excavator, and is discharged to the rear and collected. When closing the sludge discharge port with the stop gate, the gate plate again slides on the front surface of the bulkhead to cover the sludge discharge port, and the gate plates are in close contact with each other on the front surface of the sludge discharge port to seal the sludge discharge port.

In the structure in which the gate plates are engaged with each other by the meshing portion in front of the sludge discharge port, when closing the sludge discharge port, the gate plates can be brought into close contact with each other by engaging the concavo-convex portions with each other on the front surface of the sludge discharge port, resulting in a stronger pressure inside the face. It is also possible to seal the mud outlet.

[0007]

An embodiment of the present invention will be described with reference to the drawings.
The present embodiment is an example of a shield machine in which two gate plates which mesh with each other are provided in front of the sludge discharge port of a bulkhead, and which is used as a stop gate which is rotated to open and close the sludge discharge port. 1 is a front view showing an embodiment, FIG. 2 is a vertical sectional view of a first half portion of the embodiment, FIG. 3 is a vertical sectional view of a second half portion of the embodiment, FIG.
Is a vertical sectional view of the latter half of the embodiment, FIG. 4 is a horizontal sectional view of the first half of the embodiment, FIG. 5 is a horizontal sectional view of the latter half of the embodiment, and FIG. 6 is a sectional view taken along line AA of FIG. 7 is a sectional view taken along the line BB in FIG. 2, FIG. 8 is a partially cutaway side view showing an essential part of the embodiment, and FIG.
Is a partially cutaway plan view showing a main part of the embodiment, and FIG. 10 is an explanatory view showing a tunnel excavation work using the embodiment.

In the shield machine 1 of this embodiment, the bulkhead 2 which separates the face 37 and the underground working space immediately after the cutter head 12 which rotates at the forefront to excavate the natural ground 42.
There is. The mechanism for driving the cutter head 12 transmits the driving force generated by the electric motor 14 with a speed reducer in the shield 13 to the rotary main shaft 15 penetrating the center of the bulkhead 2 via the gear 16 and is directly connected to the rotary main shaft 15. Head 1
It has a mechanism to rotate 2. On the other hand, the bulkhead 2 is provided with a mud discharge port 8 for discharging the earth and sand 38 in the face, a pressure introduction hole 10 for a pressure sensor 9 for detecting the pressure in the face, and a mud supply port 17 for press face press-fitting. A stop gate 3 for opening and closing the mud port 8 is attached. The mud discharge port 18 is connected to a mud discharge pipe 18 for passing the earth and sand 38 in the face introduced from here to the rear part of the shield machine 1. This sludge pipe 18
A trommel 19 that separates the stone 39 contained in the soil 38 inside the face from the mud or sand while rotating by the drive device 20 is installed at the end of the. The mud storage tank 21 under the trommel 19 containing the separated mud and sand is connected to the tank 32 provided on the ground by the mud discharge pipe 27, so that the suction force from the vacuum suction device 31 on the ground can be transmitted up to this point. ing. On the other hand, as a means for discharging the stones 39 separated by the trommel 19, a truck 29 that transports the stones 39 to the shaft 41 is installed. On the contrary, in order to press the mud into the face 37, the mud sending device 33 for supplying the mud is provided on the ground,
It is connected to the bulkhead 2 by a mud pipe 28. The shield machine 1 to which these devices are connected is a shaft 4
The pressing force from the original push jack 30 installed in 1 is
It is a mechanism in which the pressure receiving portion 23 at the rearmost end is received via the fume pipe 36 which supports the natural ground 42, and while being supported by this, the intermediate push jack 22 immediately in front of the pressure receiving portion 23 propels it.

The stop gate 3 which opens and closes the sludge discharge port 8 of the shield machine 1 of this embodiment is provided with interlocking portions 3a which are engaged with each other in a closed state, and two gate plates which are rotatable around pins 7 respectively. It is composed of 4. Gate board 4
A pin 7, which is a rotating shaft, penetrates through the bulkhead 2 and includes a gate plate 4 and a link arm 6 on the rear surface side of the bulkhead 2.
And are connected and integrated. On the rear surface of the same bulkhead 2, a gate jack 5 for rotating the coaxial gate plate 4 by rotating the link arm 6 has one end with the link arm 6.
The other end is rotatably attached to the rear surface of the bulkhead 2. The pressure introducing hole 10 of the bulkhead 2 is located within the rotation range of the gate plate 4, and
The bulkhead 2 with a stopper 11 that restricts the rotation range of
It is provided at the center height.

In the tunnel excavating method using the shield machine 1 of the present embodiment, the mud sent under pressure from the mud sending device 33 on the ground through the mud sending pipe 28 is fed from the mud feeding port 17 of the bulkhead 2 into the face 37. While press-fitting and increasing the pressure inside the face to prevent the ground 42 from collapsing, the cutter head 12
Is rotated to excavate. Simultaneously with the excavation, the shield machine 1 is propelled by the intermediate push jack 22, and when it is propelled by a predetermined amount, the fume pipe 36 is pushed by the source push jack 30 to support the ground 42 of the tunnel portion and the shield machine 1 as a whole. Will be the advanced form.

The soil and stones 39 excavated by the cutter head 12 are mixed with the mud that is press-fitted into the cutting face 37, and as the fluid 38 in the cutting face, which has fluidity, maintains the pressure inside the cutting face and prevents the excavated ground from collapsing. Fulfill. When the amount of the earth and sand 38 inside the face increases and the pressure inside the face detected by the pressure sensor 9 at the back of the pressure introduction hole 10 exceeds an appropriate value, each gate jack 5 on the rear surface of the bulkhead 2 is driven for a long time. When the link arm 6 linked to the gate jack 5 is rotated around the pin 7, the gate plates 4 connected and integrated with the pin 7 are simultaneously rotated. The mud discharge port 8 is opened by the rotation of these gate plates 4 constituting the stop gate 3, and the earth and sand 38 inside the face is introduced into the mud discharge port 8. The gate plates 4 each rotate about the pin 7 toward the outside of the sludge discharge port 8 by about 120 ° and reach the position of the stopper 11 at the center of the bulkhead 2. During this time, the front surface of the bulkhead 2 including the front surface of the pressure introducing hole 10 is attached to cover the front surface. The soil particles 40 are scraped off while directly contacting. When the pressure drop inside the face is detected by the pressure sensor 9, this time, the gate jacks 5 are extended to rotate the link arms 6 in the opposite direction, and the integrated gate plate 4 is rotated to close the mud discharge port 8. , Make sure that the pressure inside the face is not too low. The left and right gate plates 4 are firmly adhered to each other at the meshing portion 3a to ensure the closing of the sludge discharge port 8 against a high face pressure. Sludge outlet 8
The earth and sand introduced in (1) passes through the mud discharge pipe 18 and reaches the rear trommel 19, where it is separated into stone 39 and mud and sand. The mud and sand enter the mud storage tank 21 under the trommel 19, are sucked by the vacuum suction device 31 on the ground, and the mud pipe 2
It is collected in the tank 32 via 7 A part of the collected mud is sent to the mud sending device 33, and is returned from the mud sending device 33 to the cutting face 37 through the mud sending pipe 28 and the mud feeding port 17. On the other hand, the stones 39 separated by the trommel 19 are collectively carried by the truck 29 to the shaft 41 and are carried out to the outside.

In the shield machine 1 of the present embodiment, by providing the stop gate 3 using the two gate plates 4, the movable range of the gate plate is wide and the scraped area of the adhering soil particles on the front surface of the bulkhead is large. It is possible to remove the adhering soil particles that reduce the fluidity of the soil in the face.

[0013]

EFFECTS OF THE INVENTION According to the present invention, the two gate plates constitute the stop gate for scraping off the soil particles adhering to the front surface of the bulkhead including the pressure introducing holes each time the mud discharge port is opened and closed. The pressure introduction hole is almost never blocked by adhered soil particles, and the pressure sensor directly senses the pressure inside the face to enable accurate grasping of the pressure inside the face, which allows the excavation work to proceed safely and the mud rim. Soil particles adhering to the soil will be removed and a good drainage condition will be maintained, and earth and sand in the face will be smoothly introduced into the drainage pipe from the drainage port, improving work efficiency.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment.

FIG. 2 is a vertical sectional view of a first half portion of the embodiment.

FIG. 3 is a vertical sectional view of the latter half of the embodiment.

FIG. 4 is a horizontal sectional view of a first half portion of the embodiment.

FIG. 5 is a horizontal sectional view of the latter half of the embodiment.

6 is a cross-sectional view taken along the line AA of FIG.

FIG. 7 is a sectional view taken along line BB of FIG. 2;

FIG. 8 is a partially cutaway side view showing a main part of the embodiment.

FIG. 9 is a partially cutaway plan view showing a main part of the embodiment.

FIG. 10 is an explanatory diagram showing a tunnel excavation work using an example.

FIG. 11 is an explanatory diagram showing a state in which soil particles adhere to a conventional shield machine bulkhead.

[Explanation of symbols]

 1 Shield excavator 2 Bulkhead 3 Stop gate 3a Interlocking part 4 Gate plate 5 Gate jack 6 Link arm 7 Pin 8 Drainage port 9 Pressure sensor 10 Pressure introduction hole 11 Stopper 12 Cutter head 13 Shield 14 Electric motor with reduction gear 15 Spinning spindle 16 Gears 17 Mud Supply Port 18 Drain Pipe 19 Trommel 20 Drive Device 21 Mud Tank 22 Medium Push Jack 23 Pressure Receiving Section 24 Packing 25 Bivic Joint 26 Direction Correcting Jack 27 Drain Pipe 28 Mud Pipe 29 Truck 30 Original Push Jack 31 Vacuum suction device 32 Tank 33 Mud-sending device 34 Compressor for underground blast 35 Air pipe 36 Fume pipe 37 Cutting face 38 Cutting face earth and sand 39 Stone 40 Adhesion particles 41 Vertical shaft 42 Rock

Claims (2)

[Claims] 1. A bulkhead is provided behind a cutter head for excavating a rock in front of a tunnel, which separates a face from the face and a mine. A drainage pipe is connected to the bulkhead to discharge the earth and sand in the face backward. In a shield machine for tunnel excavation, which has a mud opening, a stop gate that opens and closes this mud opening, and a pressure introduction hole that communicates with a pressure sensor for detecting the pressure inside the face, the left half and right half of the mud opening Shields characterized by using two gate plates, each of which has a shape that closes each other, as a stop gate, which is rotatably attached to the front of the bulkhead within a movable range from the position where the mud discharge port is closed to the height at which there is a pressure introduction hole. Excavator. 2. The shield machine according to claim 1, wherein at the portions of the two gate plates that are in contact with each other in the center thereof, concave and convex engaging portions that are in close contact with each other are provided at positions where the mud discharge port is closed. .