JPH04272397A - Brush seal for tail of shield excavator and manufacturing method - Google Patents

Abstract

PURPOSE:To obtain cut-off effect in very early time and, at the same time, to prevent the leakage of a cut-off material to the inside of the excavator by loading cloth in advance between a circumferential protective plate of a brush seal for a tail of the shield excavator and a bundle of flexible wires. CONSTITUTION:A bundle 2 of flexible wires such as steel wires, aramid fiber, nylon fiber, polyacetal fiber, etc., are held with a circumferential side protective plate 3 and a peripheral side protective plate 4 to insert cloth 5 in advance between the bundle 2 of the tail brush seal 1 formed together as a unit and the protective plate 3. The cloth 5 can be inserted between the bundle 2 and the protective plate 4. The cloth 5 functions as a water cut-off layer, and the cloth 5 is stopped up with adherence of filler such as grease including fiber so that the strong water cut-off layer can be formed. According to the constitution, the incursion of ground water, mudd water and backfilling injection agent to the inside of the excavator can be surely prevented.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brush seal for the tail of a shield tunneling machine and a method for manufacturing the same. More specifically, it is a brush seal for the tail that seals water in the gap between the shield body and the segment of a shield tunneling machine.It is a brush seal for the tail that can achieve a water-stopping effect extremely early and prevent leakage of the water-stopping material. This invention relates to a brush seal and its manufacturing method.

0002

[Prior Art] A shield tunneling machine commonly used at present is a steel cylindrical machine M, as shown in Fig. 6.
It has a tail plate 21 at the rear, a cutter head 22 outside the tip of the main body, and a shield jack 2 inside.
3 and erector 24.

[0003] When digging a tunnel with this excavator,
Segment 25 assembled so far as shown in Figure 6
A shield jack 23 is pressed against the tip of the machine to advance the machine forward, and at the same time, the cutter head 22 is rotated to excavate. Then, as shown in Figure 7, the shield jack 2
3 is extended and the machine has traveled a certain distance, the shield jack 23 is retracted and a new segment is assembled by the erector 24 between the rear end of the shield jack 23 and the existing segment 25, as shown in FIG. From now on, repeat these steps to create the tunnel wall.

[0004] By the way, while the excavation was in progress, the ground A
In order to prevent the intrusion of muddy soil water and backfilling injection agent,
As shown in FIG. 9, a wire brush type packing 26 is mainly attached to the tail plate 21 as a brush seal. This wire brush type packing 2
6 generally has a wire brush 29 and a mesh structure 30 such as a wire mesh sandwiched between an outer protection plate 27 and an inner protection plate 28 made of steel or stainless steel, and is usually a tail plate. 21 in two or three or more stages. FIG. 10 is an explanatory cross-sectional view showing the state of the brush shown in FIG. 9 after deformation (in use).

The inside of the wire brush 29 of the wire brush type packing 26 and the space 31 between the brush seal parts are filled with a water-stopping material (generally water-stopping grease) for the purpose of waterstopping. This prevents spring water, mud water, and backfilling injection agent from flowing into the inside of the machine from the ground A.

That is, the wire brush type packing 26
In the tail seal to which the tail seal is attached, the space 31 between the brush seals and the inside of the wire brush 29 are filled with a water stop material before the vehicle starts moving.

[0007] Most of these waterproof materials are made by mixing fibers and inorganic powder into a grease base material, and are pumped from the grout hole into the space 31 between the brush seals to fill the space. Then, the fibrous material separated from the grease base material gets entangled with the wire brush 29 and forms a felt layer, or the fibrous material and powder do not separate and fill the inside of the wire brush 29 in a wall-like state. The intrusion of water, muddy soil, and back-filling injection agent is prevented by interaction with the water-stopping material filled in the space.

[0008]

[Problems to be Solved by the Invention] However, in actual work, it takes a considerable amount of time to form the felt layer or wall soil layer. Under these conditions, water veins may be encountered, the pressure of the backfilling agent may be high, or when excavating at great depths, significant water leakage may occur inside the machine, and drainage must be removed while excavating. There is a problem that it must be done.

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to provide a tail brush seal and a method for manufacturing the same, which eliminates the drawbacks of the prior art. That is, an object of the present invention is to obtain a desired water-stopping effect very quickly by installing in advance a felt layer or a cloth that functions similarly to a wall-like layer within the brush seal installed in several stages on the tail plate. An object of the present invention is to provide a brush seal for a tail and a method for manufacturing the same.

0010

[Means for Solving the Problems] A brush seal for the tail of a shield tunneling machine according to the present invention is used for a tail seal of a shield tunneling machine, in which a bundle of elastic wires is sandwiched between an inner circumference protection plate and an outer circumference protection plate. It is a brush seal that is attached and integrally molded,
It is characterized in that a cloth is inserted between the inner peripheral side protection plate and the bundle of elastic wires. In addition, the manufacturing method of the brush seal for the tail of a shield tunneling machine according to the present invention is used for the tail seal of a shield tunneling machine, in which a bundle of elastic wires is clamped between an inner peripheral protection plate and an outer peripheral protection plate and integrally formed. A brush seal manufacturing method in which a brush unit is integrally formed by sandwiching a bundle of elastic wire between an inner circumferential protection plate and an outer circumferential protection plate, and is fixed to a predetermined location of a shield tunneling machine to form a brush seal part. After that, a strip of cloth is inserted between the inner peripheral side protection plate and the bundle of elastic wires to form a cylinder, or a plurality of brush units each having cloth pieces inserted in the same position as described above are inserted. It is characterized in that the ends of the cloth pieces are fixed to a predetermined location of the shield tunneling machine so that they overlap each other.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A brush seal for the tail of a shield tunneling machine (hereinafter referred to as a brush) and a manufacturing method thereof (hereinafter referred to as a manufacturing method) according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is an explanatory cross-sectional view of one embodiment of the brush of the present invention.

In FIG. 1, 1 is a brush according to an embodiment of the present invention, and the brush 1 is made of steel wire, aramid fiber (for example, Kevlar (registered trademark) manufactured by DuPont),
A bundle 2 of elastic wires such as nylon fibers and polyacetal fibers is clamped between an inner circumferential protection plate 3 and an outer circumferential protection plate 4 and integrally formed. The elastic wire is required to have heat resistance, abrasion resistance, economic efficiency, and strength, and from this point of view, it is preferable to use steel wire among the above-mentioned materials. In addition, the diameter of the elastic wire is not particularly limited in the present invention, but is usually 0.
．． A diameter of around 3mm is used. On the other hand, the protection plate 3,
As the material 4, a steel plate or SUS material with a thickness of about 1 mm can be used.

A feature of the present invention is that a cloth 5 is inserted in advance between the bundle of elastic wires 2 and the inner protection plate 3. As shown in FIG. 2, the cloth 5 may also be inserted between the bundle of elastic wires 2 and the outer protection plate 4, and if it is inserted between both protection plates in this way, it will be more secure. You can get a water-stopping effect. This cloth 5 is brush 1
When assembling the unit, the cloth 5 is placed on the bundle 2 of elastic wires, and the protective plate 3 is then pressed onto the cloth 5, thereby being inserted between the bundle 2 and the protective plate 3. Then, a brush seal portion is formed by fixing the plurality of brush units to a predetermined location of the shield tunneling machine so that the ends of the plurality of pieces of cloth overlap each other. In order to form a continuous water-stopping layer and obtain a reliable water-stopping effect against intrusion of muddy soil and water from all directions, the edges of the cloth pieces should be 1 cm apart.
It is preferable to insert them so that they overlap to some extent (Figure 4
reference). On the other hand, after fixing the brush unit and forming the brush seal part, it is also possible to use a strip of cloth and insert it between the bundle of elastic wires 2 and the protection plate 3 to form a cylinder. However, if the outer diameter of the tail plate is large, it becomes difficult to attach a single piece of cloth, so it is preferable to use a plurality of pieces of cloth.

It is preferable to insert a mesh structure such as a wire mesh between the bundles 2 of elastic wires in order to improve the elasticity of the elastic wires and to improve the entanglement of the fibers.

As mentioned above, by inserting the cloth 5 into the brush 1 in advance, the cloth 5 functions as a water-stopping layer,
Furthermore, by adhering a filler such as fiber-containing grease, the cloth 5 is packed to form a stronger water-stopping layer. This water stop layer can reliably prevent groundwater, mud water, and backfilling injection agent from entering the inside of the machine from the initial stage of excavation work. FIG. 5 is an explanatory cross-sectional view showing the state of the brush shown in FIG. 1 after deformation (in use).

It is preferable that the length L of the cloth 5 (see FIG. 1) be slightly shorter than the length of the elastic wire in order to improve water-stopping properties.

[0018] In this specification, the term "fabric" is a broad concept that includes not only woven fabrics, knitted fabrics, and non-woven fabrics, but also all materials such as paper that can form a water-stopping layer by working together with grease. be.

The brush 1 of the present invention is attached to the tail plate 8 via a U-shaped steel 7 or a fixing member such as a bolt. In actual use, the brush 1 is deformed by being pressed against the segments 9.

FIG. 3 is a cross-sectional view of another embodiment of the brush of the present invention. The brush shown in FIG. 3 differs from the brush shown in FIG. 2 in that the tips of the protection plates 3 and 4 are bent inward. Press the cloth 5 against the elastic wire bundle 2,
The work of inserting the cloth 5 between the protective plates is not easy because the cloth 5 may slip down, but by forming the folded portion, the cloth 5 can be prevented from slipping and the work efficiency can be improved. It is also possible to prevent the cloth from falling off during excavation work.

[0021]

As explained above, according to the brush of the present invention, the cloth is inserted between the inner circumferential side protection plate and the bundle of elastic wires, and the cloth is inserted from the initial stage of excavation, unlike the felt in the conventional brush. Since a layer or a water-stopping wall is formed, a water-stopping effect can be obtained very quickly. Furthermore, the water-stop material does not leak into the inside of the machine, making it safe and economical at the same time.

[Brief explanation of the drawing]

FIG. 1 is an explanatory cross-sectional view of one embodiment of the brush of the present invention.

FIG. 2 is an explanatory cross-sectional view of another embodiment of the brush of the present invention.

FIG. 3 is an explanatory cross-sectional view of still another embodiment of the brush of the present invention.

FIG. 4 is a sectional view taken along the line (A)-(A) in FIG. 1.

5 is an explanatory cross-sectional view showing a state of the brush shown in FIG. 1 after deformation; FIG.

FIG. 6 is an explanatory diagram of tunnel excavation work using a shield excavator.

FIG. 7 is an explanatory diagram of tunnel excavation work using a shield excavator.

FIG. 8 is an explanatory diagram of tunnel excavation work using a shield excavator.

FIG. 9 is an explanatory cross-sectional view of a tail brush seal of a conventional shield tunneling machine.

10 is an explanatory cross-sectional view showing a state of the brush shown in FIG. 9 after deformation; FIG.

[Main symbols in the drawing]

1 Brush 2 Bundle of elastic wire 3 Inner peripheral side protection plate 4 Outer circumferential protection plate 5 Cloth

Claims (3)

[Claims] 1. A brush seal used as a tail seal of a shield tunneling machine, in which a bundle of elastic wires is clamped and integrally formed with an inner protection plate and an outer protection plate, wherein the inner protection plate A brush seal for the tail of a shield tunneling machine, characterized in that a cloth is inserted between a bundle of elastic wires and a bundle of elastic wires. 2. A method for producing a brush seal used for a tail seal of a shield tunneling machine, in which a bundle of elastic wires is clamped between an inner circumferential protection plate and an outer circumferential protection plate and integrally formed. A brush unit which is integrally formed by being clamped between the inner and outer protection plates is fixed to a predetermined location of the shield tunneling machine to form a brush seal portion, and then the inner and outer protection plates and the elastic A method for manufacturing a brush seal for the tail of a shield excavator, characterized by inserting a strip of cloth to form a cylinder between a bundle of wire rods. 3. A method for producing a brush seal used for a tail seal of a shield tunneling machine, in which a bundle of elastic wires is clamped between an inner circumference side protection plate and an outer circumference side protection plate and integrally molded, A plurality of brush units having pieces of cloth inserted between a protection plate and a bundle of elastic wires are fixed to a predetermined location of the shield excavator with the ends of the plurality of cloth pieces overlapping each other. Manufacturing method for a brush seal for the tail of a shield tunneling machine.