JPH0354237Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an improvement of a soil squeezing device that adjusts soil discharge at a soil discharge port of a screw conveyor for soil conveyance attached to a shield excavator.

[Prior Art] A shield tunneling machine generally has the following features as shown in Fig. 3.
The face is excavated by a rotary cutter b attached to the front end of the cylindrical shield frame a, and the earth and sand taken into the cutter chamber d divided by the cutter b and the bulkhead c are moved backward in the excavation direction. It has a screw conveyor e for conveying to. And the soil discharge port f of the screw conveyor e
The earth and sand discharged from the earth and sand is loaded by a belt conveyor e onto an earth and sand transport cart waiting at the rear.

Incidentally, an earth and sand squeezing device i having two slide gates g and h may be attached to the earth and sand discharge port f of the screw conveyor e to adjust the earth and sand according to the properties of the earth and sand.

[Problems to be solved by the invention] However, in the conventional soil squeezing device i, the soil discharge chute j connected to the soil discharge port f is straight in the direction orthogonal to the screw axis k,
Moreover, since the second slide gate h attached to the opening e was arranged parallel to the screw axis k like the first slide gate g attached to the soil discharge port f, the following problems occurred. Ta.

Since the earth removal chute j is straight in the direction of gravity, even if the opening adjustment range of the first and second slide gates g and h is changed, the earth and sand accumulated in the earth removal chute j will be reduced. It is difficult to form a stopper zone, and water-stopping properties are low.

Since the opening of the earth removal chute j extends in the direction of gravity, especially in the case of a small-diameter shield, the gap n between the opening and the belt conveyor m is narrow, and the screw conveyor installation angle α and the belt conveyor installation angle are narrow. As the relationship with β becomes α≦β, the above-mentioned gap n gradually decreases toward the earth and sand conveying direction of the belt conveyor m. As a result, the smooth movement of earth and sand and large-diameter gravel is hindered, and the earth and sand are easily spilled, resulting in construction work being interrupted. There was a problem that reduced construction efficiency.

Therefore, the present invention was devised to solve the above-mentioned problems of the conventional technology.The purpose of this invention is to form an earth plug zone in the earth removal chute, improve water-stopping performance, and improve the soil removal chute. To provide an earth and sand squeezing device for an earth discharge port of a screw conveyor, which can secure a space for ejecting earth and sand and large-diameter gravel between an opening and a belt conveyor, reduce spillage of earth and sand, and improve construction performance. It is.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an earth discharge port which is opened in a direction perpendicular to the screw axis and which transports earth and sand from the cutter chamber of the shield excavation machine backward in the excavation direction. In a screw conveyor for discharging soil from the ground onto a belt conveyor, a soil discharge chute having an opening at the rear in the excavation direction is provided to form a soil plug zone at the soil discharge port, and a first soil discharge chute for opening and closing the soil discharge chute is provided at the soil discharge port. A slide gate is provided in the opening, and a second slide gate for opening and closing the slide gate is inclined so as to face diagonally upward rearward in the excavation direction so that the gap between the slide gate and the belt conveyor gradually increases toward the rear in the excavation direction. It was established.

[Operation] When the soil discharged from the soil discharge port of the screw conveyor to the soil discharge chute is changed in its moving direction along the soil discharge chute, it generates resistance and stagnates, forming a soil plug zone. The gap between the opening of the earth discharge chute and the belt conveyor gradually increases toward the rear in the excavation direction (earth conveyance direction of the belt conveyor), so a space for ejecting earth and sand and large-diameter gravel is secured, and the earth and sand are removed. It can be transported smoothly without spilling.

[Example] An example of the present invention will be described below in detail based on the accompanying drawings.

In FIGS. 1 and 2, 1 is a cylindrical shield frame of a shield excavator, and a cutter 3 for excavating a face is rotatably attached to a bulkhead 2 at the front end of the frame. A cutter chamber 4 is defined in between.

A screw conveyor 5 having a carry-in end 5a communicating with the cutter chamber 4 is attached to the bulkhead 2 with its rear end on the side of the soil discharge port 6 facing diagonally rearward and upward in the excavation direction. The screw shaft 7 of the screw conveyor 5 is rotatably driven by a motor 8 at the rear end.

A screw shaft 7 is attached to the rear end of the screw conveyor 5.
An earth removal chute 11 having an opening 10 at the rear in the excavation direction to form an earth plug zone 9 is attached to the earth removal port 6 which is formed perpendicularly to the soil removal port 6 and facing the direction of gravity. Specifically, a perpendicular line 12 drawn from the front end 10a of the opening 10 of the soil discharge chute 11 to the screw shaft 7 is set to pass near the rear end 6a of the soil discharge port 6. And soil removal chute 11
Below the opening 10 is a belt conveyor 1 for further conveying the discharged earth and sand to the rear.
3 is placed with its delivery end facing diagonally upward in the excavation direction.

The soil discharge port 6 is provided with a first valve for opening and closing it.
A slide gate 14 is slidably mounted parallel to the screw shaft 7, and this first slide gate 14 is opened and closed by a cylinder 15. In addition, a second slide gate 16 for opening and closing the opening 10 of the earth removal chute 11 is installed diagonally rearward in the excavation direction so that the gap s between it and the screw conveyor 13 gradually increases toward the rear in the excavation direction. It is installed facing upward and tilted so that it can slide freely. In addition, soil removal chute 1
The edge of the first opening 10 is the second slide gate 16
is formed parallel to. In order to open and close the second slide gate 16, cylinders 17 are attached to both ends of the edge of the opening 10 of the earth removal chute 11, and the rod ends 17a of these cylinders 17 are used to open and close the second slide gate 16. It is connected to both sides of the direction end.

The earth and sand squeezing device is constituted by the earth discharge chute 11 which is inclined in this manner and the gates 14 and 16 whose opening ends are different from each other.

In addition, in the figure, 18 is a shield jack, and 19 is a segment assembly machine.

In the above configuration, the earth and sand in the cutter chamber 4 is conveyed rearward in the excavation direction by the rotation of the screw shaft 7, and is discharged from the earth discharge port 6 through the earth discharge chute 11 onto the belt conveyor 13. usually,
The soil discharge is adjusted by fully opening the first slide gate 14 and adjusting the opening degree of the second slide gate 16.

Since the opening 10 of the earth removal chute 11 is shifted further back in the excavation direction than the earth removal port 6, when the direction of movement of earth and sand is changed in the earth removal chute 11, resistance is generated and stagnation occurs, causing soil plugs. Zone 9 is formed.
Therefore, the water-stopping property is improved, and the earth pressure or water pressure of the face can be suppressed, thereby preventing accidents of collapse of the face.

Further, since the second slide gate 16 is not parallel to the screw axis and is inclined so that the gap s between it and the belt conveyor 13 gradually increases in the conveyance direction, the opening 10 of the soil discharge chute 11 A space for carrying out the earth and sand and large-diameter gravel discharged from the belt onto the belt conveyor 13 can be secured, and spillage of earth and sand is reduced. Therefore, it does not take much time to clean up the spilled earth and sand, and the earth and sand can be moved smoothly, improving the efficiency of transporting the earth, leading to an improvement in construction efficiency.

[Effects of the invention] In summary, the present invention provides the following excellent effects.

(1) Sediment can be retained in the earth discharge chute to form an earth plug zone, which improves water-stopping performance and prevents the face from collapsing.

(2) Since the gap between the opening of the soil removal chute and the belt conveyor gradually increases toward the rear in the excavation direction, even with a small-diameter shield, there is sufficient space to discharge soil and large-diameter gravel. This reduces spillage of soil and improves the efficiency of tunnel construction.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, FIG. 2 is a schematic view taken along the line A--A in FIG. 1, and FIG. 3 is a schematic longitudinal sectional view showing a conventional device. In the figure, 4 is the cutter chamber, 5 is the screw conveyor, 6 is the soil discharge port, 7 is the screw shaft, 9 is the soil plug zone, 10 is the opening, 11 is the soil discharge chute, 13
1 is a belt conveyor, 14 is a first slide gate, and 16 is a second slide gate.

Claims (1)

[Scope of utility model registration request] In a screw conveyor that transports earth and sand from the cutter chamber of a shield excavator backward in the excavation direction and discharges the earth onto a belt conveyor from an earth discharge port opened in a direction perpendicular to the screw axis, an earth plug zone is installed at the earth discharge port. A soil discharge chute having an opening at the rear in the excavation direction is provided to form a soil discharge chute, and a first slide gate for opening and closing the soil discharge chute is provided at the soil discharge port, and a second slide gate for opening and closing the soil discharge chute is provided at the opening. An earth and sand squeezing device for a screw conveyor, characterized in that the earth and sand squeezing device for a screw conveyor is provided so as to face obliquely upward in the rear direction of the excavation direction so that the gap between the conveyor and the conveyor gradually increases toward the rear in the excavation direction.