JPS6157797A - Shield type tunnel drilling machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a shield type tunnel excavator)
.

(Prior art) In a conventional shield type tunnel excavator, as shown in Fig. 5, bentonite or clay powder is dissolved in water and used as a muddying agent at a concentration of 30 to 100%, which is then pumped into the face or It is injected into the chamber <b) in front of the bulkhead (α) inside the shield machine body, and is expected to stabilize the face and fluidize the porcelain.

(Problem to be solved by the invention) However, in soils with very large pore water in water-retaining sand and gravel layers or sand layers, or in soft soils with extremely high water content, the muddying material itself may add a large amount of water. Therefore, although various methods are being proposed to push out pore water in the ground using counter-earth pressure or muddying materials, there is currently no pump that can pump the muddying material itself at a higher concentration. It is difficult to implement each method, and the moisture content of the excavated soil is extremely high due to the moisture in the muddy material, making it impossible to transport by dump truck.

(Means for solving the problems) The present invention has been proposed to solve these problems,
a muddying material supply device which pumps powdered muddying material using compressed air at a pressure higher than the face water pressure and supplies the powdered muddying material from a powdery muddying material supply port opened in the front surface of the cutter face plate; and the cutter face plate. The present invention relates to a shield type tunnel excavator characterized in that a water supply port is provided near the powdery mud material supply port on the front surface of the shield type tunnel excavator.

(Function) Since the present invention is configured as described above, when excavating soil with a very large amount of pore water at the face in a water-retaining gravel layer or soft soil with a high water content ratio, it is possible to The material is pumped with compressed air at a pressure higher than the water pressure of the face, and is fed to the face through the powdered slurry material supply port that opens on the front of the cutter face plate, and is kneaded in front of the cutter face plate using the pore water of the face. , to reduce the moisture content of the discharged soil as much as possible. At this time, compressed air with a higher pressure than the water pressure of the face is supplied to the front of the cutter face together with powdered muddying material, so the front face of the cutter face plate is kept under limited air pressure. As a result, the stability of the face is improved.

In addition, in soils where there is little water in the ground, water is supplied from the water supply port arranged on the front of the cutter face plate near the powdered mud material supply port, and powdered mud is added by rotation of the cutter face plate and cutter bit. By mixing and stirring the mud materials, the soil can be removed in an optimal condition and the face can be excavated safely.

(Example) The invention will now be described with reference to the illustrated embodiment.

(1) is the shield 9 body, (2) is the shield jack,
(3) is a cutter drive source, and (4) is a small gear attached to the drive source, which meshes with a large gear (5) disposed on the outer diameter side of the bearing. (6) c force is the seal, (8) is the partition wall, (
9) is the rotary joint, (10) is the cutter face plate (1
1) (121 is the pulp for supplying powdered muddying material and the pulp for supplying water, respectively, which are arranged on the partition wall (8), and the pulp for supplying powdery mudding material (n) is attached to the four-tally joint support arm ( It passes through the pipe (14) in I■ and communicates with the powdered slurry material supply port Q6) which opens at a position distant from the cutter slit 09 on the front surface of the cutter face plate 00. Also, water supply pulp (12+ is the support Piping within the arm (1 (to))
17) to a water supply port θ barrel opened on the front surface of the cutter face plate 00) at a position close to the powdered mud material supply port (16). Q in the diagram! J (19') is a cutter bit for the cutter slit 05) and a stirring cutter bit, respectively.

The kan is a pore water pressure gauge that measures the water pressure at the face, and is sometimes replaced with an earth pressure gauge. CI) is a screw outer cylinder, Q is a screw shaft, and (C) is a screw rotation drive body, which is variable speed and changes the rotation speed so that the earth pressure in the chamber is constant. Q4 is an earth removal game)
, (251 is an earth pressure gauge in the chamber section.

In Figure 3, the powdered muddying material (A) containing an appropriate amount of clay, indonite, etc. is supplied using a powder mixer (2η) to ensure sufficient agitation. At the discharge port at the bottom of the hopper, which is connected to the screw cone tube for supplying powdered slurry material, a valve handle whose opening degree can be adjusted is installed.
The variable speed screw controller is the drive source.

In addition, if the c3 bottle is a pulp connected to a compressed air source and the supply amount cannot be adjusted by the compressed air source, the pulp 03 is used. A pressure gauge 04) compressed air flow meter (to) is installed in the pipe CI connected to the valve C321, and the same flow meter 01
The pipe connected to the screw run ear outer cylinder (c) is connected to the tip of the screw run ear outer cylinder (c), and the compressed air and powdered muddying material are mixed in the same part, and a nozzle is also connected to the same part. 2 Luso 6
A pipe (to) is connected via 7), and the pipe is connected to the pulp 01).

In Fig. 4, 0 is a water tank, a pipe connected to the tank (40 is equipped with a pulp (4υ), a water pump (42 is installed), and a pipe connected to the outlet of the same pump (4) is installed.
A pressure gauge (44) and a flow meter (4) are connected to the pipe (4ω is the pulp 02) connected to the same flow meter (4).

In the figure (471 is a variable speed water pump (42 drive source).

Since the illustrated embodiment is configured as described above, the water content in the ground and the necessary mix of muddying materials are assumed based on the water content ratio, porosity, saturation degree, etc. that have been investigated in advance, and the face is adjusted accordingly. Powdered muddying materials such as improvers, fluidization accelerators, or water-absorbing materials when there is a large amount of water (indonite,
Add appropriate amounts of clay and water-absorbing materials) and other materials to the hopper c! e
and valve C! 1 and close the stirrer Q'? ) to mix and stir.

In addition, the pressure is greater than the value measured by the water pressure gauge or earth pressure gauge in front of the cutter face plate ClCe0, and the air pressure is such that the powder can be discharged from the muddy material supply port 00, and the powdery muddy material can be conveyed. The amount of pulp c (c) is connected to the compressed air source.The amount of powdered muddying material can be adjusted by adjusting the opening of the valve (c) and the rotation speed of the screw controller (drive source 01). Adjust the water content ratio and slump value according to the soil discharge condition.

In addition, if there is little moisture in the face, or if the moisture is pushed out by the compressed air and is too small for mixing and stirring, the water pump drive source (47) can be adjusted to pump an appropriate flow of water to the front of the cutter face plate 00). Supply water at the face water pressure or at a pressure higher than the Tonosho pressure.

When the powdered muddying material and water are supplied in this way, the rotation of the cutter is used to sufficiently mix and stir both of them and the ground soil using the cutter bit and cutter face plate to create an appropriate viscosity. It makes the face impermeable and gives fluidity to the earth and sand. This earth and sand is then taken into the chamber to fill the chamber to prevent the powdered muddying material, compressed air, and water from escaping to the rear.

(Effects of the Invention) According to the present invention, the muddying material supply device and the water supplying device are provided separately as described above, and powdered muddying material is applied to the front shoulder of the cutter face plate of the mudding material supplying device by compressed air. The interstitial water is mixed and stirred by the rotating action of the cutter face plate, and when water is insufficient, the water is supplied near the powder muddying material supply port or from the water supply port on the front of the cutter face plate. The soil removal condition is such that the water content ratio of the soil can be reduced as much as possible. Since the powdered slurry material is pumped at a pressure higher than the water pressure of the face, a limited amount of air is applied from in front of the cutter face plate, making the face more stable.

In addition, the adjustment of the powder of the added slurry, the compressed air, the water droplet, and the supply pressure to the face pressure is 'PJ!' Since one section can be formed, it is possible to perform kneeling44) in the optimum condition depending on the stability of the face, the excavation status of the nine shield machines, and the soil removal status.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional side view showing an embodiment of a shield type tunnel excavator according to the present invention, Fig. 2 is a view taken in the direction of the arrow in Fig. 1, and Fig. 3 is a pressure feeding of powdered muddying material. FIG. 4 is a longitudinal sectional view showing the mechanism, FIG. 4 is a longitudinal sectional view showing the pressure water supply mechanism, and FIG. 5 is a longitudinal sectional side view of a conventional shield type tunnel excavator. (1)...Shield body, Ql...Cutter face plate, (
11)... Pulp for supplying powdered muddying material, Q... Water supply nozzle, (14)... Piping for supplying powdered muddying material, Oe... Supplying powdery muddying material Port, ←η...Water supply piping, 0 barrel...Water supply port Sub-agent Patent attorney Okamoto
Heavy 3 people outside the kiln 1st staff

Claims (1)

[Claims] a muddying material supply device that pumps powdery muddying material using compressed air at a pressure higher than the water pressure of the face, and supplies the powdered muddying material from a powdery muddying material supply port opened in the front face of the cutter face plate; A shield type tunnel excavator characterized by comprising a water supply port disposed near a powdered mud material supply port.