JP3463587B2 - Trommel and device for preventing clogging of trommel - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trommel for separating excavated soil by a shield method and a device for preventing clogging of the trommel.

[0002]

2. Description of the Related Art As a non-excavation construction method for constructing a tunnel in the ground, there is a shield construction method for constructing a tunnel while excavating the ground by a tubular shield machine. In particular, a so-called semi-shield construction method in which a propulsion pipe is pushed from the rear of a shield machine is known as a method for constructing a small-diameter tunnel.

In the conventional semi-shield construction method, since the tunnel diameter is small, how efficiently the excavated soil is discharged out of the mine in a narrow space is a problem. As one of the solutions to this problem, there is a method by pipe transportation, but in this method, large-diameter gravel cannot be discharged. Therefore, according to this method, it is necessary to remove large-diameter gravel that cannot be transported by piping.

As a device for separating such large-diameter gravel, for example, a large-diameter cobblestone separating means (hereinafter referred to as "Trommel") applied to the mud discharging device of the semi-shielding method disclosed in Japanese Patent Laid-Open No. 7-269294. There is). 6,
FIG. 7 is a diagram showing the overall configuration of the mud discharging device of the semi-shielding method shown in the publication, FIG. 6 is a transverse sectional view, and FIG. 7 is a longitudinal sectional view.

First, the overall construction of the sludge discharge device and the construction of the trommel will be described with reference to FIGS. 6 and 7. In FIG. 6 and FIG. 7, 51 is a shield body that can be bent by a direction correcting jack 56, 52 is a cutter head provided at the front of the shield body 51, and a cutter head drive motor 53 rotates a rotary shaft via a speed reducer 54. It is designed to rotate around 55.

The cutter head 52 is formed of spokes 52a having a substantially cross shape, and a plurality of cutters 5 are radially spaced from the front surfaces of the spokes 52a.
2b is provided so as to project a face in front of the reshield main body 51 and a large-diameter cobblestone by these cutters 52b.

A passage 55a is formed in the rotary shaft 55, and the front end of the passage 55a is a spoke 52.
It communicates with a passage 52c formed in a. The tip of the passage 55a formed in the rotary shaft 55 and the tip of the passage 52c provided in each spoke 52a are opened at the tip of the rotary shaft 55 and the front surface of the cutter 52b attached to the tip of the spoke 52a. The mud material supplied from the mud material supply pipe (not shown) to the passage 55a in the rotary shaft 55 through the rotary joint 57 is ejected from the openings into the excavated earth and sand. .

On the other hand, the earth and sand taken into the chamber 51a is passed through the discharge pipe 60, the emergency pinch valve 61, the flexible pipe 62 and the regular pinch valve 63 to the trommel 64 provided in the rear part of the shield body 51. It is supposed to be discharged.

The trommel 64 for separating the large-diameter cobblestone mixed with the sediment from the sediment is formed of a cylindrical basket,
The vertical rod 64a is composed of a large number of vertical rods 64a arranged parallel to the axis and a spiral rod 64b spirally arranged in the circumferential direction so that a large diameter cobblestone of a preset size cannot pass through. The size of the mesh between the spiral rod 64b and the spiral rod 64b is set so that the large-sized boulders separated from the sediment and remaining in the trommel 64 can be transported backward by a transport means (not shown) from a route different from that of the sediment. There is.

On the other hand, below the trommel 64, a hopper 66 is installed in which the earth and sand separated from the large-sized boulders by the trommel 64 falls. The hopper 66 has an upper surface opened, and a part of the bottom portion 66a is an inclined surface 66c which is largely inclined toward the suction port 66b, so that the earth and sand falling from the opening can easily flow to the suction port 66b side. The earth and sand pressure pump is connected to the suction port 66b through a suction pipe 67 and a ball joint (not shown).

Explaining the operation of the prior art configured as described above, the earth and sand excavated by the cutter head 52 along with the propulsion of the shield main body 51 flows by the mud material ejected from the passages 52c in the spokes 52a. After the body mud is taken into the chamber 51a, it is sent from the earth discharge pipe 60 to the trommel 64 through the emergency pinch valve 61 and the regular pinch valve 63, and the trommel 64 separates the large-sized cobblestone in the earth and sand. The separated large-diameter cobblestone is carried out to the rear via another route (not shown), and the earth and sand that have passed through the trommel falls into the hopper 66, and the inclined surface 66c at the bottom of the hopper 66 moves to the suction port 66b side. Be guided.

As another conventional example, Japanese Patent Publication No. 1-199.
There is an invention of a soil sieving device shown in Japanese Patent No. 47. In the one disclosed in the publication, when gravel is separated using a trommel, if clay mass or the like is contained in the excavated soil to be separated, vibration or rotation may cause adhesion or clogging of the trommel. The purpose of this is to prevent the clogging due to the occurrence of deterioration of the sorting function.

8 and 9 are views showing the structure of the trommel shown in the publication, FIG. 8 is a sectional view, and FIG. 9 is a perspective view. According to the present invention, a rubber plate 85A having a hole is provided inside the wall of the trommel 81 sieve net 83 with a rubber plate stopper 85B.
The rubber plate 85A is provided with a hole that is slightly smaller than or close to the size of the sieve.

In another conventional example configured as described above, the excavated soil carried into the inside of the trommel passes through the holes of the perforated rubber plate 85A, further passes through the openings of the sieving net 83, and goes downward. To fall. At this time, the perforated rubber plate 85A
Has a certain amount of slack, so when it is on the lower side due to the rotation of the trommel, it is pressed against the sieving net by the contents, and when it goes to the upper side, the contents disappear and the gravity causes the convex shape. It is said that there is an effect of throwing away the clay lump adhering to the surface of the perforated rubber plate 85A or closing the hole by the repeated operation of hanging down.

[0015]

However, in the one disclosed in Japanese Unexamined Patent Publication No. 07-269294, a trommel is used in order to improve the efficiency of sludge removal in the semi-shielding method, but a measure against clogging is taken. If the excavated soil to be sorted contains mud, clay, etc.
If it adheres to the vertical rod 64a and the spiral rod 64b of the trommel basket and causes clogging, and if left as it is, it becomes difficult for the sludge to flow to the hopper 66 (sludge tank) and the sorting function deteriorates. There is a problem.

Further, in the one disclosed in Japanese Examined Patent Publication No. 1-19947, a perforated rubber plate 85A having a hole which is slightly smaller or approximately similar to the mesh of the sieving mesh is provided inside the trommel as a mechanism for preventing clogging of the trommel. Although installed
This mechanism has a problem that the holes of the perforated rubber plate 85A installed inside the trommel are clogged, which eventually leads to deterioration of the function.

The present invention has been made in order to solve the above problems, and an object thereof is to obtain a device for preventing clogging of trommel which removes mud and clay adhering to a trombel and a basket of trommel with less clogging. There is.

[0018]

The trommel according to the present invention is a solid material having a predetermined size or more when an excavated soil containing gravel, cobblestone, clay, muddy water, etc. by the shield method or the semi-shield method is put into a basket. In the case of separating the above, the outer circumference of the rod forming the basket of the trommel is coated with a material having low adhesiveness and wettability.

The coating material is characterized by being any one of polyethylene, Teflon, and urethane elastomer.

The device for preventing clogging of the trommel according to the present invention is installed on the outer or inner circumference of the basket of the trommel.
It consists of a brush .

Further, the brushes are installed so as to face the outer peripheral side and the inner peripheral side of the basket, respectively.

Further, the brush is characterized by having an outlet for compressed air.

In addition, on the outer or inner circumference of the basket of Trommel
Installed air that blows out compressed air to remove foreign matter
It consists of a brush .

Further, in the axial direction of the basket of Trommel,
In addition, it is made of a wire material which is installed in close proximity to the peripheral surface of the basket.

Further, a wire is laid in the axial direction of the basket and close to the peripheral surface of the basket.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. FIG. 1 is an explanatory diagram of an embodiment of the present invention. In FIG. 1, 1 is a large-diameter gravel separating apparatus, that is, trommel, 3 is a vertical rod 3a and a horizontal rod 3b.
A basket of trommel 1 in which and are joined in a grid pattern at regular intervals, 5 is a turning roller for rotating the basket 3, and 7 is a brush installed on the peripheral surface above the basket 3 along the axial direction of the basket 3. is there. The brush 7 is installed on a gate-shaped fixed base installed so as to straddle the basket 3.

Longitudinal rod 3a constituting the basket 3 of the trommel 1
The surface of the horizontal rod 3b is coated with a material having low adhesiveness and wettability, such as polyethylene, Teflon, or urethane elastomer. Therefore, mud and clay are less likely to adhere to the basket 3.

The brush 7 is installed on the outer peripheral surface of the basket 3 along the axial direction with the tips of the brushes inserted into the basket 3. In this state, when the basket 3 rotates, the bristles of the brush 7 come into contact with the vertical rods 3a and the horizontal rods 3b and adhere to them.
Remove the clay.

The overall operation of the present embodiment configured as described above will be outlined. When excavated soil is thrown into the basket 3 of the trommel 1, due to the rotation of the basket 3, small-diameter soil and the like will fall downward from the eyes of the basket 3, and large-sized gravel and large-sized clay will move inside the basket 3. Move towards the exit. At this time, since the excavated soil contains highly viscous mud and clay, they may adhere to the vertical rods 3a and the horizontal rods 3b of the basket 3 and cause clogging. Since the surfaces of the vertical rods 3a and the horizontal rods 3b constituting the
It is difficult for mud and clay to adhere to. Even if they adhere, the bristles of the brush 7 come into contact with the vertical rods 3a and the horizontal rods 3b of the basket 3 to remove clay and the like attached to them.

As described above, according to this embodiment, the coating and the action of the brush 7 prevent mud and clay from adhering to the surface of the basket 3 easily, and the adhering substances can be easily removed to prevent clogging. it can.

In the above example, the basket 3 is coated and the brush 7 is installed. However, the case where the brush 7 is installed without coating or the brush 7 is installed without coating is shown. It goes without saying that even if it does, there is a certain effect.

The brush 7 may be provided with an air supply hole and a plurality of air blowing holes may be provided on the bristle implantation side. With such a structure, compressed air is supplied from the air supply hole and jetted from the air blowing hole, so that mud or the like is removed by the bristles of the brush 7 and the jet force of the compressed air also removes mud or the like. Removal can be performed, and more effective removal of deposits becomes possible.

Embodiment 2. 2 and 3 are explanatory views of another embodiment of the present invention. FIG. 2 is a side view and FIG. 3 is a sectional view. In the figure, the same parts as those in FIG. 1 showing the first embodiment are designated by the same reference numerals.

In the second embodiment, the brush 7 is not installed over the entire length of the basket 3, but is installed at a place where clogging is expected, and the inside of the basket 3 is opposed to the outside brush. It was installed. By doing so, it becomes possible to more effectively remove the deposit such as clay. The brush 7 installed on the inside is the brush 7 on the outside.
The gate-shaped base that fixes the
It may be installed by being inserted into the device and fixed to the inserted piece.

Embodiment 3. FIG. 4 is an explanatory diagram of another embodiment of the present invention, in which the same parts as those in FIG. 1 showing the first embodiment are designated by the same reference numerals. In the third embodiment, an air brush 9 is installed instead of the brush 7 in the first embodiment. Airbrush 9 is basket 3
It is installed on the outer peripheral part of and has an air inlet and an air outlet. A plurality of air outlets are provided in the axial direction of the basket.

According to the present embodiment, the compressed air is blown out from the airbrush 9 while the basket 3 is rotating, so that the mud and clay which cause the clogging can be removed.
Further, since the airbrush 9 is not in contact with the basket 3, it does not affect the rotation of the basket 3.

In the above example, the airbrush 9 is placed in the basket 3.
Although the example installed on the outer circumference of the
It may be provided inside. Further, although an example in which a plurality of air outlets are provided has been shown, when the air pressure is high, it may be slit-shaped.

Fourth Embodiment FIG. 5 is an explanatory view of another embodiment of the present invention, in which the same parts as those in FIG. 1 showing the first embodiment are designated by the same reference numerals. In the fourth embodiment, instead of the brush 7 in the first embodiment, a wire rod 11 such as a piano wire or a wire is installed close to the inner peripheral surface of the basket 3 of the trommel 1. The wire rod 11 is installed in a state of being pulled with a constant tension via a pulley 13.

The wire 11 prevents clogging of the basket 3 by scraping off mud and clay adhering to the inner peripheral surface of the basket 3 when the basket 3 rotates. The fixed position of the wire rod 11 can be freely changed by adjusting the direction or the number of the pulleys 13.

In the above example, the pulley 13 is 2
Although the number of individual units is shown, the present invention is not limited to this, and three or more units may be provided. Further, although the example in which the wire rod 11 is installed inside the basket 3 is shown, the wire rod 11 may be installed outside the basket 3.

[0041]

Since the present invention is configured as described above, it has the following effects.

By coating the outer periphery of the rod forming the basket with a material having low adhesiveness and wettability, mud and clay are less likely to adhere and clogging can be prevented.

Further, by installing the brush on the outer circumference or the inner circumference of the basket of Trommel, even if mud or clay adheres to the basket, the mud etc. adhered by the bristles of the brush coming into contact with the basket as the basket rotates. Since it can be removed, clogging can be prevented.

Further, since the brushes are installed so as to face the outer peripheral side and the inner peripheral side of the basket, the adhered mud and clay can be reliably removed.

Further, since the brush is provided with a blowout port for compressed air, by injecting the compressed air from the air blowout port, mud and the like can be removed by the bristles of the brush as well as by the air jetting force. Can be removed, and more effective removal of deposits is possible.

Further, since an airbrush for blowing out compressed air to remove adhered matters is installed on the outer or inner circumference of the basket, the adhered matters such as mud can be removed and clogging can be prevented without affecting the rotation of the basket. Can be prevented.

Further, since the wire rod is installed in the axial direction of the basket of the trommel and in the vicinity of the peripheral surface of the basket, mud or the like is removed by the wire rod as the basket rotates and clogging can be prevented. .

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a trommel and a trommel clogging prevention device according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional view of a trommel clogging prevention device according to a second embodiment of the present invention.

FIG. 3 is a cross-sectional view of a device for preventing clogging of a trommel according to a second embodiment of the present invention.

FIG. 4 is an explanatory diagram of a trommel clogging prevention device according to a third embodiment of the present invention.

FIG. 5 is an explanatory diagram of a trommel clogging prevention device according to a fourth embodiment of the present invention.

FIG. 6 is a cross-sectional view showing the configuration of a conventional mud discharge device.

FIG. 7 is a vertical cross-sectional view showing the configuration of a conventional mud discharge device.

FIG. 8 is a cross-sectional view of a conventional trommel clogging prevention device.

FIG. 9 is a perspective view of a conventional trommel clogging prevention device.

[Explanation of symbols]

1 Trommel 3 baskets 3a vertical rod 3b Yokomo 5 turning rollers 7 brushes 9 Airbrush 11 wire rod

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Nobuo Takasu Inventor Nobuo Marunouchi 1-2-2 Marunouchi, Chiyoda-ku, Tokyo Inside Nippon Kokan Co., Ltd. (56) Reference JP-A-7-269294 (JP, A) JP-A 7-119176 (JP, A) JP-A-7-197780 (JP, A) JP-A-10-272424 (JP, A) JP-A-10-43686 (JP, A) JP-A-8-302733 (JP, A) J. Kohei 6-29246 (JP, Y2) (58) Fields investigated (Int.Cl. ⁷ , DB name) E21D 9/12

Claims (8)

(57) [Claims] 1. A shield method or a semi-shield method is used.
In a trommel that puts excavated soil containing gravel, cobblestone, clay, muddy water, etc. into a basket and separates solid matter of a predetermined size or more, adhesion and wettability to the outer circumference of the rod that constitutes the basket of the trommel Trommel is characterized by coating a small material. 2. The coating material is polyethylene,
The trommel according to claim 1, which is one of Teflon and urethane elastomer. 3. A device for preventing clogging of a trommel, comprising a brush installed on an outer circumference or an inner circumference of the basket of the trommel according to claim 1 or 2. 4. The device for preventing clogging of a trommel according to claim 3, wherein the brushes are installed so as to face the outer peripheral side and the inner peripheral side of the basket, respectively. 5. The device for preventing clogging of a trommel according to claim 3, wherein the brush has a blowout port for compressed air. 6. The trommel basket according to claim 1 or 2, which is installed on the outer or inner circumference of the basket and blows compressed air to attach the basket.
A device for preventing clogging of trommel, which comprises an airbrush for removing objects . 7. An overhead wire extending in the axial direction of the basket of the trommel according to claim 1 or 2 and close to the peripheral surface of the basket.
Clogging preventing device trommel, characterized in that it consists of wire rod. 8. The device for preventing clogging of a trommel according to claim 3, wherein a wire is laid in the axial direction of the basket and close to the peripheral surface of the basket. .