JP3463586B2 - Trommel anti-clogging device - 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 clogging preventing device for preventing clogging of a trommel for separating excavated soil by a shield method or the like.

[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). 7,
FIG. 8 is a diagram showing the overall construction of the mud discharge device of the semi-shielding method shown in the publication, FIG. 7 is a transverse sectional view, and FIG. 8 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. In FIGS. 7 and 8, reference numeral 51 denotes a shield main body that can be bent by a direction correcting jack 56, 52 a cutter head provided at the front of the shield main body 51, and a cutter head drive motor 53 for rotating 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.

9 and 10 are views showing the structure of the trommel shown in the publication, FIG. 9 is a sectional view, and FIG. 10 is a perspective view. In this invention, Trommel 81 sieve mesh 8
Inside the wall of 3, the perforated rubber plate 85A is attached to the rubber plate stopper 8
The rubber plate 85A is attached with a slight slack through the 5B, and the rubber plate 85A is provided with a hole that is slightly smaller than or substantially the same as 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-mentioned problems, and a trommel for preventing clogging of trommel by removing the cling of trommel attached to the basket of trommel or solidified muddy water. The purpose is to obtain a clogging prevention device.

[0018]

[0019]

Trommel according to the present invention
The clogging prevention device is a shield method or semi-shield
Excavated soil containing gravel, boulders, clay, muddy water, etc., is removed by the construction method.
A trowel that is placed in a basket and separates solids of a certain size or larger.
Trommel clogging to prevent clogging
It is a device to prevent
Is installed along with multiple types of length, wire diameter, and bend.
It consists of a brush with lashes .

Further, a plurality of types of bristles having different wire diameters and bendings are arranged in a direction corresponding to the axial direction of the basket in the brush, and lengths differ in a direction corresponding to the rotating direction of the basket. It has multiple types of hair.

The material of the bristles of the brush is resin.

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

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. FIG. 1 is an explanatory diagram of an embodiment of the present invention, and FIG. 2 is an explanatory diagram of a main part. Figure 1
In the above, 1 is a large-diameter gravel fractionation device, that is, trommel, 3
Is a basket of the trommel 1 in which the vertical rods 3a and the horizontal rods 3b are joined in a grid pattern at regular intervals, 5 is a turning roller for rotating the basket 3, 7 is an upper surface of the basket 3, and the axial direction of the basket 3 It is a brush installed along. In addition, the brush 7
Should be installed on a gate-shaped fixed base installed so as to straddle the basket 3.

The details of the brush 7 will be described with reference to FIG. In the brush 7, bristles are planted in three rows with different bristle lengths. Then, two types of bristles having different wire diameters and bendings are planted in each row. In FIG. 2, a portion indicated by a is a hair having a small wire diameter and large bending, and a portion indicated by b is a hair having a large wire diameter and small bending. FIG. 3 is a side view showing the positional relationship between the bristles of the brush 7 and the basket 3. As shown in FIG. 3, a line is placed at a position corresponding to the horizontal rod 3b of the basket 3 with the brush 7 installed. Bristles with a small diameter and large bending are placed. In addition, a wire having a large wire diameter and a small bend is arranged at other positions.

The reason for installing in this way is as follows. First, there are two reasons for arranging bristles having a small wire diameter and large bending at the portion in contact with the horizontal rod 3b. The first reason is to arrange the bristles having large bending to reduce the resistance when the basket 3 rotates. The second reason is that by thinning the wire diameter, the hairs can be densely packed and planted, the hairs are easily entangled in the horizontal rod 3b, and the adhering matter can be reliably removed. In addition, a part with a large wire diameter and a small bend was arranged in the part other than the part in contact with the horizontal rod 3b, that is, in the part of the eyes of the basket 3 because a relatively large amount of mud and clay adhered to this part. This is because it is effective to use thick bristles having a wire diameter that does not obstruct.

Further, as shown in FIG. 2B, the length of the bristle feet of the brush 7 is set to be different in each row.
The first row is installed in h1, the second row is installed in h2, and the third row is installed in h3, and there is a relationship of h1 <h2 <h3. Then, with the brush 7 installed, as shown in FIG.
It is installed in order from the shortest foot with respect to the rotation direction of
As the basket 3 rotates, the vertical rod 3a is arranged in order from the shortest one with short legs.
It comes in contact with. By setting the relationship between the rotation of the basket 3 and the bristles as described above, all the bristles, from short bristles to long bristles, can contact the vertical rods 3a. On the contrary, in the case where the long rods are brought into contact with the vertical rods 3a in order from the longest one, when the long bristle is bent, it becomes a state of wrapping the short bristle. The contact of short bristles with the vertical rod 3a is hindered.

The bristle tips of the first row extend from the middle to the outer peripheral surface of the vertical rod 3a, and the bristle tips of the second row extend from the lower part of the outer peripheral surface of the vertical rod 3a to the middle portion, and the bristle tips of the third row. Is arranged below the vertical rod 3a. By installing in this way, the basket 3
The hair of the first row moves from the middle part of the vertical rod 3a to the upper surface as the hair rotates, and the hair of the second row moves the vertical rod 3a.
From the lower portion of the vertical rod 3a, stroking the inner surface of the vertical rod 3a.
In this way, by changing the length of the bristles for each row, the attached matter can be removed over substantially the entire circumference of the vertical rod 3a, and clogging can be effectively prevented.

In the present embodiment, a nylon material having a diameter of 1.0 mm is used as a hair having a small wire diameter and a large bending, and a hair having a diameter of 1.6 mm is used as a hair having a large wire diameter and a small bending.
Nylon hair was used. Nylon is used as the material of the hair in consideration of the small amount of mud adhered and the fact that the mud tends to fall even if adhered. The length of the fluff is 60 mm for the first row and 70 m for the second row.
m, the third row was 80 mm.

The operation of this embodiment configured as described above will be described. 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, the bristles of the brush 7 are entangled with the vertical rods 3a and the horizontal rods 3b of the basket 3 to remove clay and the like attached to them. At this time, by changing the wire diameter and the bending of the bristles, the substances attached to the horizontal rod 3b can be removed. Also, by changing the length of the bristle tip, the vertical rod 3
It can be effectively removed over almost the entire circumference of a.

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, the compressed air is supplied from the air supply hole and jetted from the air blowing hole, so that the bristles of the brush 7 remove mud and the like, and also the mud is removed by the air jetting force. Can be performed, and more effective removal of deposits is possible.

When changing the length of the bristles in the width direction of the brush 7, three kinds are used in the embodiment, but the number is not limited to three kinds. Further, although the nylon material is used as the material of the bristles of the brush, the material is not limited to the nylon material.

Embodiment 2. 5 is an explanatory view of another embodiment of the present invention, FIG. 5 is a side view, and FIG. 6 is a sectional view. In the figure, the same parts as those in FIGS. 1 to 4 showing the first embodiment are designated by the same reference numerals.

In the present embodiment, the brush 7 is installed not at the entire length of the basket 3 but at a place where clogging is expected and at the inside of the basket 3 facing the outside brush. It was done. By doing so, it becomes possible to more effectively remove the deposit such as clay.
The brush 7 to be installed on the inner side is installed so that one piece of the U-shaped member is inserted into the basket 3 on the gate-shaped base for fixing the outer brush 7, and is fixed to the inserted piece. You can do it.

[0034]

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

Since the brushes are installed along the outer circumference or the inner circumference of the basket of the trommel, the clogging of the basket can be prevented by the brush removing the deposits of the basket as the basket rotates.

The brush has a plurality of types of length, wire diameter,
Since the hair having the bending is provided, it is possible to effectively remove the deposit by appropriately arranging various hairs.

Furthermore, a plurality of types of bristles having different wire diameters and bendings are arranged in a direction corresponding to the axial direction of the basket of the brush, and a plurality of types of bristles having different lengths in the direction corresponding to the rotating direction of the basket. By arranging, the resistance during rotation of the basket can be reduced, and the deposit can be effectively removed.

Further, since the material of the bristles of the brush is made of resin, the adhesion of mud is small, and even if it adheres, the mud easily falls off.

Furthermore, since the brushes are installed so as to face the outer peripheral side and the inner peripheral side of the basket, the deposits can be removed more reliably.

[Brief description of drawings]

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

FIG. 2 is an explanatory diagram of a brush of the trommel clogging prevention device according to the first embodiment of the present invention.

FIG. 3 is a vertical cross-sectional view of the trommel clogging prevention device according to the first embodiment of the present invention.

FIG. 4 is a cross-sectional view of the trommel clogging prevention device according to the first embodiment of the present invention.

FIG. 5 is a vertical sectional view of a trommel clogging prevention device according to a second embodiment of the present invention.

FIG. 6 is a cross-sectional view of a trommel clogging prevention device according to a second embodiment of the present invention.

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

FIG. 8 is a vertical cross-sectional view showing the configuration of a conventional mud discharge device.

FIG. 9 is a cross-sectional view of a conventional trommel clogging prevention device.

FIG. 10 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

─────────────────────────────────────────────────── ─── 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 10-272424 (JP, A) JP-A-10-43686 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) E21D 9/12

Claims (4)

(57) [Claims] 1. A shield method or a semi-shield method is used.
For trommel, which puts excavated soil containing gravel, cobblestone, clay, muddy water, etc.
Trommel clogging prevention device to prevent clogging in
A location, the trommel is disposed along the outer or inner periphery basket of a plurality of types of length, diameter, bending clogging preventing device trommel, characterized in that it consists of a brush having bristles with . 2. A plurality of types of bristles having different wire diameters and bendings are arranged in a direction of the brush that coincides with the axial direction of the basket, and a length of the bristles in a direction that coincides with the rotation direction of the basket. clogging prevention device trommel according to claim 1, characterized in that a different type of hairs. 3. A clogging prevention device trommel according to claim 1 or 2, wherein the bristles of the material of the brush is a resin. Wherein said brush, clogging prevention device trommel according to any one of claims 1 to 3, characterized in that respectively installed to face the outer peripheral side and inner peripheral side of the basket.