JPH0367194B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is a system that constantly fills a storage chamber and a screw conveyor with a mixture of sludge and muddying material and efficiently transports it backwards to enable smooth excavation. be.

Conventional technology In general, a mud-adding type shield machine has a partition wall on the back of the face plate to form a storage chamber, which is filled with excavated waste, and then the mud material is injected and kneaded with the slurry to give fluidity, and then the screw conveyor is conveyed. It is said to be a shield machine that has a mechanism for removing soil.

There are cases in which mud-adding shield machines are unable to excavate smoothly due to sludge being consolidated in the sludge storage chamber or adhering to the walls. In addition, the slurry material may not be sufficiently kneaded with the slurry, and a mixture of the slurry and slurry material with good fluidity may not be obtained, making smooth excavation impossible.

Problems to be Solved by the Invention The present invention eliminates the above-mentioned drawbacks and constantly fills the storage chamber and the screw conveyor with a mixture of sludge and muddying material, and efficiently transfers the mixture to the rear so that smooth excavation can be carried out. This is an attempt to solve the structural problem of

Means for Solving the Problems The mud-adding type shielding machine of the present invention has a large number of cutting bits attached to the front part of a storage chamber whose outer periphery is formed into a conical shape with a smaller diameter as it approaches the partition wall. A rotatable face plate with an opening is provided, and a face plate supporter having a fan-shaped cross section that becomes narrower toward the rear and toward the center is fixed to the rear surface of the face plate at a position symmetrical to the opening. A reflective support plate is provided on the inner surface of the storage chamber where the supporter moves at the highest circumferential speed so as not to interfere with the face plate supporter, and a slurry material injection hose is connected to a hole drilled in the center of the reflector plate. The goal is to have a configuration that does this.

Embodiment A face plate 4 is formed in which a large number of cutting bits 1 are attached to the front surface, large openings 2 are made in several places, and the center parts are connected 3. At the ends of the openings 2 of the face plate 4, holes are formed so that the width becomes narrower toward the rear. A taper 5 is formed, and the outer periphery of the face plate 4 is integrally connected by an arcuate plate 6. A face plate support 7 having a fan-shaped cross section is fixed to the rear of the face plate 4 so that the width becomes narrower toward the rear and toward the center, and a ring with a gear 8 carved inside the rear end of the face plate support 7 is fixed. Fix gear 9.

Reference numeral 10 denotes a fixing ring of the face plate supporter 7, which is rotatably attached to the bulkhead 11 of the shield machine via a watertight bearing. In the figure, the face plate support 7
The rear end and the ring gear 9 are connected by a shaft 12, which passes through a fixed ring and is airtightly attached.

A space between the face plate 4 and the partition wall 11 becomes a waste storage chamber 13.

A drive gear 17 attached to a rotating shaft 16 of a drive motor 15 appropriately fixed in a work chamber 14 is meshed with the gear 8 of the ring gear 9. A fixed opening 21 is provided in a trough 20 having a waste removal port 19 at the lower part. 22 is screw conveyor 18
The outer partition 23 of the drive motor for the sludge storage chamber 13 is shaped like a cone so that the diameter becomes smaller as it approaches the partition wall 11, the rear end is fixed to the partition wall 11, and a plurality of reflecting plates 24 are attached to the inner surface. It is being A hole 24a is bored in the center of the reflecting plate 24, a muddying material injection hose 24b is connected to the hole 24a, and the muddying material injection hose 24b is connected to a muddying pump (not shown). .

25 is a skin plate, 26 is a shield jack, 27 is a segment, 28 is a tail seal, 2
Reference numeral 9 indicates a rail, 30 indicates a Zuritro, and 31 indicates an earth pressure gauge.

Function: To explain the flow of excavated waste, the ground at the face is broken down by the cutting bit 1 attached to the face plate 4, and is stored in the storage chamber 13 through the opening 2 of the face plate 4. A taper 5 is provided at the end of the opening 2 of the face plate 4.
, so that the shear is forcibly given a component force toward the storage chamber 13 by the rotation of the face plate 4. The sludge sent into the storage chamber 13 is given a component force to move toward the center and rear of the storage chamber 13 by the rotation of the face plate supporter 7 fixed to the face plate 4. Reflector plate 24
is fixed to the outer partition 23 of the non-rotating shield wall surface, and has the purpose of pushing back the shear on the outer edge of the storage chamber 13 toward the center, and uses the turbulent flow generated near the reflection plate 24 to connect the slurry material injection hose. The muddy material injected from 24b can be efficiently mixed with the slurry, and the reflector 24 is designed not to interfere with the face plate support 7.

Thereafter, the screw conveyor 18 discharges the waste from the waste removal port 19 to the waste toro 30 and conveys it to the outside.

The rotation of the screw conveyor 18 and the opening degree of the waste removal port 19 can also be controlled.

In the mud-adding type shield machine equipped with the above-mentioned components, the waste cut by the face is continuously fed into the storage chamber, sufficiently mixed with the mud-adding material, and then discharged from the screw conveyor.

Moreover, the earth pressure in the storage chamber can be controlled by adjusting the rotation speed of the screw conveyor, the opening degree of the outlet, and the rotation speed of the face plate. Furthermore, the compaction state inside the storage chamber can be determined using an earth pressure gauge, allowing for smooth excavation.

Effects of the Invention (a) In order to always apply force to the sludge taken into the storage chamber from the opening of the face plate toward the center of the storage chamber and toward the rear, the face plate supporter has a cross section that becomes smaller toward the rear of the storage chamber.

b The reflector fixed to the wall of the storage chamber has the effect of disturbing the shear, and since the reflector was installed at the point where the peripheral speed of movement of the face plate supporter is highest, turbulence occurs in the shear near the reflector, causing the reflector to disturb the shear. It ejects from the head and mixes the mud material efficiently.

c The waste taken into the storage chamber in steps a and b above is mixed with the muddy material and efficiently flows to the screw conveyor. Therefore, the earth pressure in the storage chamber can be controlled within a certain pulsation range by adjusting the amount of earth discharged by the screw conveyor.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the shield machine, FIG. 2 is a front view thereof, and FIG. 3 is a perspective view from the face plate to the ring gear.

Claims (1)

[Claims] 1. A rotatable face plate is provided with a large number of cutting bits attached to the front part of the storage chamber, which is formed into a conical shape whose diameter becomes smaller as the outer partition approaches the partition wall, and which has openings in several places. A face plate supporter with a fan-shaped cross section that becomes narrower toward the rear and toward the center is fixed to the rear face of the face plate at a symmetrical position of the part, and the face plate supporter is fixed to the inner surface of the storage chamber where the peripheral speed of movement of the face plate supporter is the largest. A reflector is installed so as not to interfere with the support.
A mud adding type shield machine characterized in that a mud adding material injection hose is connected to a hole drilled in the center of the reflecting plate.