JP4478122B2 - Sealing device for foldable shield machine - Google Patents

Description

  The present invention relates to a half-folded shield excavator used for constructing pipes, tunnels, etc. with a large curvature, and muddy water and earth and sand are dug from a middle folded portion in which the front and rear trunks are swingably connected. The present invention relates to a sealing device that prevents intrusion into the machine.

  Conventionally, shield tunneling machines have been widely used to construct traffic tunnels, underground pipelines, and other underground structures without digging. A shield machine is a cylindrical excavator with a face that rotates at the tip. It is an apparatus used in a so-called shield method, in which a shield for preventing collapse is continuously assembled on the inner wall surface of a tunnel.

  In recent years, due to the development of subways and infrastructure networks, in particular, underground excavation work in urban areas has been demanding complicated excavation paths including sharp curves in order to avoid interference with existing underground structures. In order to achieve this, the tunnel pipe that forms the body of the shield machine is divided into multiple parts in the direction of excavation and connected to each other so as to be able to swing, thereby changing the direction of excavation rapidly and drawing a course with a large curvature. A foldable shield machine was developed.

FIG. 1 is a schematic plan view of a folding shield machine. The excavation machine 10 includes a face 20 having a rotation axis in the excavation direction and a trunk tube 21 connected to the rear thereof and having an outer diameter slightly smaller than the rotation diameter of the face 20. The trunk tube 21 is usually made of steel so as to suitably hold the rotating face 20 and to withstand high pressure applied in a deep underground.
In the middle folding shield machine, the trunk tube 21 is divided into two or more stages in the direction of drilling, and the front stage (front trunk) 22 and the rear stage (rear trunk) 23 can swing at the middle folding section 30. It is connected. When the trunk tube 21 is divided into three or more stages, a plurality of middle bent portions 30 are provided.

The excavator 10 obtains a forward force by extending a plurality of forward jacks (not shown) provided between the ground and the rear trunk 23. By appropriately adjusting the amount of expansion / contraction of the plurality of forward jacks, the digging direction of the digging machine 10 can be gently curved. On the other hand, the excavating machine 10 has an even greater curvature in the digging direction by expanding and contracting the bent jack 31 provided between the front trunk 22 and the rear trunk 23 with the rear trunk 23 fixed to the ground. Can be sharply curved. That is, the rear end portion 22a of the front barrel 22 and the front end portion 23a of the rear barrel 23 are overlapped with each other and can slide back and forth with a predetermined stroke, and the expansion / contraction amounts of the two types of middle-folding jacks 31 are different from each other. As a result, the trunk tube 21 is swung, and the excavation direction can be changed abruptly. Specifically, as shown in FIG. 1, by shortening the upper jack in the figure located on the left hand side with respect to the digging direction and extending the lower jack in the figure located on the right hand side in reverse, Since the cut face 20 and the front trunk 22 turn leftward with respect to the excavation direction, the excavation path can be curved to the left.
In the present invention, the front means the tip side of the excavator 10 provided with the face 20, that is, the excavation direction of the entire excavator, and the rear means the opposite side. The swing angle of the front barrel 22 with respect to the rear barrel 23 is assumed to be φ.

  A plurality of ring-shaped segments 40 are accommodated in the shield machine 10, and the segments 40 are continuously pressed against the inner peripheral surface of a mine shaft formed behind the machine as the machine 10 moves forward. As a result, a shield is formed in a tunnel shape. Further, the excavated earth and sand are generally sent backward through the inside of the trunk pipe 21 by a screw conveyor (not shown), and are further carried out from the pit to the ground surface by a conveying device (not shown).

The front cylinder 22 and the rear cylinder 23 use the front cylinder 22 itself as a shield by making the front cylinder 22 corresponding to the front stage in the digging direction have a larger diameter and the rear cylinder 23 corresponding to the rear stage having a smaller diameter and overlapping each other. In general, muddy water and earth and sand (hereinafter referred to as muddy water) are not easily infiltrated from the outside of the excavator through the middle folding portion 30 during excavation work.
However, in order to perform the underground work safely, it is necessary to completely prevent high-pressure muddy water or the like existing outside the trunk pipe 21 from entering the inside of the excavator 10, and it is essential to provide some kind of sealing device. It becomes. The path through which high-pressure muddy water or the like may enter the excavator 10 includes (a) a gap between the rear end of the excavator 10 and the outer peripheral surface of the segment 40, and (b) the front cylinder 22 and the rear cylinder 23. Two of the voids.

  For the intrusion route (b) above, a brush material made of a hard steel wire bent in a cross-sectional shape is annularly connected to the rear end of the excavator 10 so that the front end of the hard steel wire flows backward in the excavation direction. A tail seal brush (for example, Japanese Patent No. 2925726) that stops the outer periphery of the segment 40 and the hard steel wire so that they are in close contact with each other at a shallow contact angle of about 30 to 45 degrees. JP, JP-A-2005-61035, etc.) are known.

  On the other hand, the above (b) is an intrusion route unique to the folding shield machine, and various inventions have been proposed as water stop means positioned in the prior art for the present invention. For example, the following Patent Document 1 discloses a method of covering the outer periphery of the bent portion 30 with a retaining film made of a flexible flexible film body, and the following Patent Document 2 discloses a rear end inner surface and a rear cylinder of the front cylinder. A method using a bent seal that slides between the outer surface of the front end portion of the rubber, and a method of loading a mass elastic body such as rubber having a deflection allowance between the front cylinder and the rear cylinder in Patent Document 3 below. , Respectively.

JP 2005-273253 A JP 2004-218198 A JP-A-6-108777

However, in the above conventional water stop method, when the digging direction of the middle folding shield machine 10 is sharply curved, that is, the front cylinder 22 and the rear cylinder 23 overlapped at the middle folding part 30 slide back and forth with a large stroke. Thus, when the swing angle φ is increased, it is difficult to sufficiently stop the middle folding portion 30 with water.
This is because when the digging path is sharply curved in the folding shield excavator 10, the outside of the front barrel 22 (corresponding to the lower side in FIG. 1) greatly advances with respect to the rear barrel 23, The inner side (corresponding to the upper side in the figure) is due to the fact that there may be a case of local return.

For example, the earth retaining film described in Patent Document 1 is composed of a stretchable film body, which is worn out due to friction between the inner wall surface of the mine shaft and the excavator, and therefore lacks durability. Since there is a limit to the stretchability of the belt, it is not possible to ensure a sufficient stroke at the middle bent portion. In other words, if a sufficient length of retaining film is provided on the outer periphery of the excavator, the surplus retaining film protrudes from the excavator on the inside of the curve and contacts the inner wall surface of the tunnel and wears. When the membrane is shortened, a sufficient stroke cannot be obtained outside the sharp curve.
Although the specific mode of the middle-fold seal described in Patent Document 2 is not clear, if it is an O-ring-like rubber packing, the packing is scraped from the mounting groove by the sliding resistance of the middle-fold portion. There is a risk of separation. In addition, since the elastic deformation amount of the rubber packing is not sufficient, there is a risk that the water stopping power may be easily lost when the clearance between the barrels fluctuates due to the swinging of the excavator. In addition, the wear of the rubber material due to particles such as earth and sand is remarkable and the durability is poor.
In the case of the massive elastic body described in the above-mentioned Patent Document 3, the sealing body is prevented from being detached because it is provided with a pressing rod and plate, but the mechanism is complicated and inferior in cost and maintenance, and rubber etc. The problem of water stoppage and durability such as muddy water due to the soft elastic material is common to the folded seal described in Patent Document 2.

  On the other hand, the conventional folded section tail seal brush cannot stop the folded portion. This is because the tail seal brush bends the hard steel wire into a dogleg shape and flows its tip backward in the direction of digging, and makes the tip of the hard steel wire abut against the outer surface of the segment in order. The tail is water-sealed (seal), and this is a technique that assumes that the tail of the excavator always moves forward in the direction of excavation. In the case where the hard steel wire is disposed in the inside of the trunk tube that may be retracted with respect to the digging direction, the tip of the hard steel wire is reversed and comes into contact with the other barrel tube. This is because the steel wire is caught in the gap between the body 23 and the hard steel wires are entangled with each other.

  The present invention has been made in order to solve the above-mentioned problems, and even when the front and rear stages of the trunk pipe of the middle folding shield machine are slid back and forth with a large stroke, the middle folding section An object of the present invention is to provide a sealing device that can always obtain sufficient water-stopping properties for muddy water, has excellent durability, and has a simple structure and excellent maintainability.

  In the present invention, a front body and a rear body are slidably connected by a brush body (bundling body) in which an elastic wire material is bundled and water is stopped between them, and the conventional technique using a bundling body of hard steel wire is used. Unlike the seal packing device, the brush body is fixed between the circumferential surface of the front barrel rear end and the circumferential surface of the rear barrel front end, which overlap each other, so that the elastic wire rises in a substantially perpendicular direction. The tip of the wire is provided so as to be able to bend in both the digging direction and the opposite direction of the digging machine.

That is, the present invention
(1) The excavation face provided at the front end in the excavation direction, the front and rear cylinders provided at the front and rear in the excavation direction, and the rear end portion of the front cylinder and the front end portion of the rear cylinder slide relative to each other. A folding device formed by freely overlapping, and a sealing device for water-stopping the folded portion of the folded folding shield machine having
A brush body in which base ends of a large number of elastic wires are bound to each other to form a binding portion, and the binding portion of the brush body is fixed to the rear end portion of the superimposed front cylinder or the front end portion of the rear cylinder. And the elastic wire is attached to the bent portion so as to rise toward the front end portion of the rear barrel or the rear end portion of the front barrel,
A plurality of the brush bodies arranged in a ring shape adjacent to each other on the peripheral surface of the rear end of the front cylinder or the front end of the rear cylinder are arranged in multiple stages in the digging direction, and at least one of them A sealing device, wherein a sealing agent supply passage for supplying a sealing agent is provided between the multi-stage sealing devices;
(2) The front end portion of the elastic wire is in close contact with the front end portion of the rear barrel or the peripheral surface of the rear end portion of the front barrel while being bent in the digging direction and the opposite direction. Sealing device;
(3) The front end portion of the rear cylinder is formed in a truncated spherical shape, the inner diameter of the rear end portion of the front cylinder is larger than the spherical surface, and the elastic wire rises in the radial direction of the spherical surface. The sealing device according to (1) or (2), wherein the brush body is attached to an inner peripheral surface of a rear end portion of a front barrel ;
The one in which the subject matter of the present invention.

The sealing device according to the present invention is composed of a brush body in which elastic wires of a predetermined length are bound, and the binding portion is fixed to one of the front cylinder and the rear cylinder that are overlapped with each other in the folding shield machine. It is comprised so that the front-end | tip part of an elastic wire may stand up toward the other side. Thereby, by using this in a region where the clearance between the front cylinder and the rear cylinder is smaller than the length of the elastic wire, the tip of the elastic wire can be bent and brought into close contact with the bent portion of the excavator.
In this way, the elastic elastic material is deformed into a massive elastic body such as rubber by bending the tip of the elastic wire with a wrap margin of a predetermined length and stopping the circumferential surfaces of the front and rear bodies. The amount of elastic deformation is much larger than that of the conventional seal, and both can be slidably connected while suitably stopping water. For this reason, even when the clearance between the front and rear cylinders is increased or decreased by increasing the swing angle of the folding shield machine, the brush body always contacts both the front and rear cylinders without any gaps. Can continue. Moreover, since the high water stop pressure according to the elastic restoring force is obtained by the elastic wire which bent the front-end | tip part, this can prevent that this penetrate | invades also into a dugout machine with respect to a high-pressure muddy water.
According to the sealing device of the present invention, since the tip of the elastic wire can be bent in both the excavation direction and the opposite direction, when the excavation path is sharply curved, Both the outer side of the folded part and the inner side that may be retracted in the opposite direction can be suitably stopped.
In addition, since the present invention can also adopt a method in which a plurality of brush bodies are arranged adjacent to each other in a ring shape in the middle bent portion, in this case, some of the brush bodies are damaged or the elastic wire is pulled out. Even when the water stoppage force is lost, the water stoppage force can be recovered by replacing or repairing only the brush body, and the maintainability is excellent.

  Hereinafter, the best mode for carrying out the present invention will be specifically described with reference to the drawings. FIG. 1 is a plan view of a middle-folded shield machine 10 in which the digging direction is bent leftward (upward in the figure) at a swing angle φ by expansion and contraction of the middle-folded jack 31 as described above. FIG. 2A shows an enlarged view of the bent portion 30 indicated by a broken line in FIG.

The trunk tube 21 is divided into a plurality of stages in the excavation direction, and is slidably connected in a state where a part thereof is overlapped with each other. The shape of the trunk tube 21 is not particularly limited, but the shape of a cross section (hereinafter referred to as a transverse cross section) in a direction orthogonal to the excavation direction may be a circle, an ellipse, an oval, a rectangle, or these Various combinations can be taken.
In the present embodiment, the trunk tube 21 has a circular shape with a circular cross section, and is divided into two stages, a front cylinder 22 corresponding to the front stage in the digging direction and a rear cylinder 23 corresponding to the rear stage. The aspect connected with 30 is illustrated. However, the number of divisions is not limited to this, and can be three or more. For example, when the trunk tube 21 is divided into three stages, two bent portions 30 are formed, and the sealing device according to the present invention can be applied to each bent portion.

  The front end 23a of the rear cylinder 23 is formed in a truncated spherical shape, while the rear end 22a of the front cylinder 22 is formed in a cylindrical shape. The inner diameter of the rear end portion 22a of the cylindrical front barrel 22 is slightly larger than the diameter of the truncated spherical surface of the front end portion 23a of the rear barrel 23, and the front barrel 22 is independent of the swing angle φ. The clearance between the rear cylinder 23 and the rear cylinder 23 is kept substantially constant. The sealing device 50 according to the present invention stops the substantially constant clearance without gaps.

  2B and 2C are enlarged views of the bent portion 30 including the sealing device 50. FIG. FIG. 6B shows the state of the sealing device 50 when the front cylinder 22 moves forward so as to be pushed forward with respect to the rear cylinder 23 by using the extension of the bent jack 31 (see FIG. 1) as a driving force. Represents. On the other hand, FIG. 3C shows the sealing device 50 in a state where the front barrel 22 is pulled back toward the rear barrel 23 due to the contraction of the bent jack 31. That is, the entire excavator 10 moves to the right in the figure, whereas the front cylinder 22 may locally recede relative to the rear cylinder 23, and FIG. Represents.

  The sealing device 50 according to the present embodiment is formed by arranging a plurality of brush bodies 50a each of which binds a large number of elastic wires to each other on the inner peripheral surface of the rear end portion 22a of the front barrel 22 in an annular shape. . In the elastic wire, the base end portions are bound to each other to form a binding portion 51, while the distal end portion 52 can be freely bent like a brush (see FIG. 3 for the front view shape of the brush body 50a).

  In the present invention, the sealing device 50 in which a plurality of brush bodies 50a are arranged adjacent to each other in an annular shape may be provided in the middle folded portion 30 in a single stage or multiple stages.

  That is, in the sealing device 50 according to the present embodiment, the brush body 50b similar to the above is annularly formed on the inner peripheral surface of the rear end portion 22a of the front barrel 22 in order to further improve the water blocking performance against the folded portion 30. After arranging the two-stage configuration, the sealing agent 60 is filled between the annular brush bodies 50a and 50b.

  The rear end portion 22a of the front barrel 22 is provided with an annular brush body mounting portion 22b cut in a step shape on its inner peripheral surface, and an annular brush body holder 24 is provided thereon. Yes. The brush body holder 24 is made of resin, metal, or the like, and has a fitting groove for fixing the binding portion of the brush bodies 50a and 50b. That is, the brush bodies 50a and 50b are attached to the front cylinder 22 so that the binding part 51 is fixed to the brush body holder 24 and the front end part 52 rises in the radial direction of the front end part 23a of the truncated spherical rear cylinder 23. It is attached.

  In the middle-folded shield machine, it is common to improve the water stoppage of the middle-folded portion 30 by making the front cylinder 22 corresponding to the front stage in the excavation direction larger in diameter and the rear cylinder 23 corresponding to the rear stage smaller in diameter. This has already been described, and this is also assumed for the present embodiment shown in FIGS. However, the sealing device 50 according to the present invention is also used in the case where the front barrel 22 has a smaller diameter than the rear barrel 23 in the folded portion 30. In such a case, the position and orientation of the brush bodies 50a and 50b to be disposed in the folded portion 30 will be easily conceivable by those skilled in the art based on the description of the present embodiment.

  The brush bodies 50a and 50b fixed to the brush body holder 24 of the front cylinder 22 come into contact with the outer peripheral surface of the rear cylinder 23 when the front cylinder 22 and the rear cylinder 23 are overlapped with each other, and the front end portion 52 thereof. Bend. Thereby, the front cylinder 22 and the rear cylinder 23 are slidably coupled to each other by the brush bodies 50a and 50b and sliding means (not shown) such as a slide rail. The brush bodies 50a and 50b are continuously arranged side by side in the circumferential direction of the folded portion 30 (the front and rear direction in the drawing in FIG. 2), that is, the elastic wire has no gap in the circumferential direction of the folded portion 30. Since it is provided, the direction in which the distal end portion 52 bends is substantially the front or rear direction of the excavation direction as shown in FIG. 2 (b) or (c).

  In the state of FIG. 2B in which the front cylinder 22 moves forward relative to the rear cylinder 23, the front ends 52 of the brush bodies 50a and 50b are bent rearward in the digging direction, and the front end 23a of the rear cylinder 23 and Closely close the folded portion 30 with water. On the other hand, in the state of FIG. 2C in which the front cylinder 22 is retracted relative to the rear cylinder 23, the tip portions 52 of the brush bodies 50a and 50b are bent forward in the digging direction, and the It is in close contact with the front end portion 23a and can maintain the water-stopping property of the folded portion 30.

  The preferred length of the elastic wire cannot be limited because it varies depending on the clearance between the front drum 22 and the rear drum 23, the thickness of the brush holder 24, the bending elastic modulus of the wire, and other conditions. In the state where the binding part 51 is fixed to the front cylinder 22, the front end part 52 is brought into contact with the rear cylinder 23 by a predetermined lapping allowance (margin), and this can be bent in both the digging direction and the opposite direction. It must be possible.

When the length of the elastic wire is shorter than this, the front end of the elastic wire cannot be brought into contact with the rear cylinder 23 or the bending amount of the front end portion 52 becomes excessively small and the adhesion to the rear cylinder 23 is inferior, so that the sufficient stop Hydropower cannot be obtained.
On the contrary, when the length of the elastic wire is excessive, when the sliding direction of the front barrel 22 with respect to the rear barrel 23 is switched from the forward direction to the backward direction, and when switching from the backward direction to the forward direction, the bending direction of the distal end portion 52 is performed. Can not be switched following this, and there is a possibility that the elastic wires may be entangled with each other or buckled.

  As an example, when a steel wire having a diameter of about 0.3 mm is used for the elastic wire, and the clearance between the front body 22 and the rear body 23 in the brush body attachment portion 22b is about 100 mm, the lapping margin of the elastic wire is 10 to 10 mm. By setting it to about 30 mm, the elastic wire rod is always in close contact with the outer peripheral surface of the rear trunk 23 while bending the elastic wire material in both the front and rear directions in the excavation direction, and the middle bent portion 30 can be suitably stopped. That is, when a general steel wire is used for the elastic wire, the length of the elastic wire is selected so that the wrap allowance is 10 to 30% on the tip side with respect to the clearance between the front drum 22 and the rear drum 23. Good.

  The sealing agent 60 is a paste-like water-stopping material having oiliness and high viscosity, and various types are commercially available. It is also suitable to improve the water stopping power by mixing short fibers with the sealing agent 60. By filling the sealant 60 between the brush bodies 50a and 50b disposed adjacent to each other in an annular shape, it is possible to increase the water stopping effect against the intrusion of muddy water or the like from the outside of the excavator 10. . Further, since the sealant 60 is oily, it also functions as a lubricating oil for the brush bodies 50a and 50b, and reduces the frictional resistance between the front end portion of the elastic wire and the outer peripheral surface of the rear barrel 23, thereby suppressing the wear of the elastic wire. Can do.

  The sealing device 50 according to the present invention uses a flexible elastic wire as a brush, so that the amount of elastic deformation can be greatly increased as compared with the prior art in which a mass elastic body itself such as rubber packing is used as a sealing body. it can. As a result, the cylindrical rear end portion 22a of the front barrel 22 and the truncated spherical front end portion 23a of the rear barrel 23 are caused by their processing tolerances, the occurrence of elastic / plastic deformation, and the like. Even when the angle fluctuates according to the swing angle φ, the sealing device 50 according to the present invention can absorb the variation due to the large amount of elastic deformation of the elastic wire and always maintain the water stopping force. it can.

  In the present embodiment, the brush bodies 50a and 50b are illustrated as being fixed on the inner peripheral surface of the rear end portion 22a of the front barrel 22. However, the sealing device 50 according to the present invention is limited to this. Instead of this, the bundling portions 51 of the brush bodies 50 a and 50 b may be fixed to the rear cylinder 23, and the front end portion 52 of the elastic wire may be brought into close contact with the front cylinder 22.

  3 shows an example of a brush body 50a used in the present embodiment. FIG. 3A is a front view of the curved brush body, and FIG. 3B is a side view thereof. FIG. 4C is a front view of the linear brush body, and FIG. 4D is a side view thereof. 71 is an elastic wire, 72 is a brush case, 73 is a protective plate, 74 is a net, 75 is a rivet, and 76 is a band. In the present invention, the horizontal direction in the drawings in FIGS. 5A and 5C is the width direction of the brush body 50a, and the horizontal direction in FIGS. 4B and 4D is the thickness of the brush body 50a. The direction.

In the curved brush body shown in FIGS. 5A and 5B, when the cross-section of the bent portion 30 is circular, a plurality of the bent portions are arranged side by side in the width direction, or the bent portion is used. When the cross section of 30 is rectangular, it can be used for the corner portion.
On the other hand, the linear brush body shown in FIGS. 3C and 3D can be used for a straight portion when the cross section is a rectangle or an oval.
That is, a curved brush body and a linear brush body can be used in combination in the sealing device 50 according to the cross-sectional shape of the bent portion 30.

For the elastic wire 71, for example, hard steel wire, aramid fiber, or nylon fiber can be used from the viewpoints of wear resistance and strength. Further, the water stopping power can be improved by applying a wave-like process to the elastic wire 71. The base ends of the elastic wire 71 are bound to each other by means such as binding with a band 76 or heat fusion.
The brush case 72 is a member that holds the binding portion 51 of the elastic wire 71 bound to each other and is fixed to the brush body holder 24 provided on the inner peripheral surface of the front barrel 22 via a rivet 75, It can be obtained from aluminum alloy or stainless alloy.
The elastic wires 71 bound to each other are sandwiched by protective plates 73 on both sides in the thickness direction so that the distal end portion 52 does not expand even when the sealing device 50 is used for a long period of time. The protective plate 73 can be obtained from a steel plate having a thickness of about 1 mm.
A thin and flexible net 74 is embedded in the center of the bound elastic wire 71 in the thickness direction. The mesh body 74 is formed by braiding a wire material such as stainless steel into a mesh shape, or by forming a large number of through holes in a steel plate or the like. By embedding this in the elastic wire 71, the water retention of the sealant 60 by the brush bodies 50a and 50b can be improved. In particular, when short fibers are mixed in the sealing agent 60, the short fibers are entangled with the net 74, and the water stopping power against muddy water and the water holding power of the sealing agent 60 can be increased. The distal end portion of the net body 74 can be freely bent together with the elastic wire 71 in the digging direction of the digging machine 10 and in the opposite direction.

  The curved brush body shown in FIGS. 3A and 3B is suitable when the inner diameter of the rear end portion 22a of the front cylinder 22 is larger than the outer diameter of the front end section 23a of the rear cylinder 23. It is used for. That is, the upper surface of the brush case 72 corresponding to the base end side of the brush body 50a has an arc shape that is convex in plan view. In addition, the tip of the elastic wire 71 in contact with the outer peripheral surface of the rear barrel 23 has an arc shape that is concave in plan view. Therefore, by arranging such curved brush bodies adjacent to each other in the width direction, the brush case 72 has an annular shape with the same diameter as the annular brush body holder 24 (see FIG. 2), and the tip of the elastic wire 71 Is formed in an annular shape having the same diameter as the cross-sectional shape of the truncated spherical front end portion 23a of the rear barrel 23. Further, in the brush body 50a, the width dimension of the brush case 72 and the width dimension of the elastic wire 71 are substantially the same, and the width dimension of the net body 74 is formed larger than this. As a result, when the plurality of brush bodies 50a are arranged side by side in the width direction and the entirety is annularly formed, the brush case 72 and the elastic wire 71 are annularly adjacent to each other, and the net 74 is part of each other. It forms a ring in a superposed state. As a result, the sealant 60 can be suitably held by the net 74 provided in a circular shape on the peripheral surface of the center bent portion 30 without any gaps, and the brush case 72 and the elastic wire having a predetermined thickness The water stopping operation in which the brush members 71 do not interfere with each other, in other words, the tip end portion 52 of the elastic wire 71 is always in close contact with the outer peripheral surface of the rear barrel 23 while flexing freely in the digging direction and in the opposite direction. Will not be disturbed.

  In the linear brush bodies shown in FIGS. 3C and 3D, the width dimension of the brush case 72 and the width dimension of the elastic wire 71 are substantially the same, and the width dimension of the net body 74 is larger than this. Therefore, when the cross-sectional shape of the folded portion 30 has a straight portion, the linear brush bodies are arranged side by side so that the brush cases 72 are adjacent to each other in the width direction and the nets 74 partially overlap each other. In addition, the straight portion of the bent portion 30 can be suitably stopped.

  4 (a) and 4 (b) are front views of a greasing brush body used in the sealing device 50 according to the second embodiment of the present invention. In any case, the brush case 72 of the brush body 50a is provided with a sealing agent supply passage 53 that communicates in the thickness direction. FIG. 4A illustrates an embodiment in which a through hole is formed in the brush case 72, and FIG. 5B illustrates an embodiment in which a cutout groove is formed in the brush case 72. 4 (a) and 4 (b) exemplify the mode of the brush body 50a in which the sealant supply passage 53 is provided in the linear brush body. FIGS. 3 (c) and 3 (d) The sealing agent supply passage 53 may be provided by forming a similar through hole or notch groove in the curved brush body shown.

  FIG. 5 is a schematic cross-sectional view showing a state in which the sealing device 50 according to the present embodiment is arranged in two stages on the inner peripheral surface of the rear end portion 22a of the front barrel 22 in the digging direction. However, in the same figure, the illustration of the front end portion 23a of the rear cylinder 23 is omitted, and the elastic wire 71 of the brush bodies 50a, 50b rises in a direction perpendicular to the brush body attachment portion 22b of the front cylinder 22 without bending. Is shown.

  The sealing device 50 according to the present embodiment includes a plurality of brush bodies 50a and 50b that are annularly arranged adjacent to each other on the inner peripheral surface of the rear end portion 22a of the front barrel 22. Part or all of the front-side brush body 50a in the digging direction is a greasing type brush body in which the sealant supply passage 53 shown in FIG. 4A is formed by a through-hole, and the brush body 50b on the rear-stage side Uses the brush body shown in FIGS. 3 (c) and 3 (d).

  A greasing pipe 25 is embedded in the rear end portion 22a of the front cylinder, and an opening end 26 on the outlet side is formed between the brush bodies 50a and 50b. An electric pumping hose (not shown) is connected to the inlet side of the greasing pipe 25, and the sealant 60 is pumped from the hose. The sealant 60 is filled into the annular closed space surrounded by the brush bodies 50a and 50b, the rear end portion 22a of the front cylinder, and the front end portion 23a of the rear cylinder through the greasing pipe 25 and the opening end 26.

  Thus, by providing the sealant supply passage 53 in the brush body 50a, the sealant 60 can be supplied stably, and even if the sealant supply passage 53 is clogged, only the brush body is provided. There is an advantage that the sealing device 50 can be easily repaired simply by exchanging / repairing.

The sealing device according to the present invention is preferably provided by a brush body in which an elastic wire whose front end can freely bend in the longitudinal direction of excavation is bound between a tubular front cylinder and a rear cylinder that slide back and forth with respect to each other. It is to stop water. Such a sealing device can suitably stop water for any part that slides back and forth with respect to the direction of excavation, in addition to the middle bent part of the folding shield excavator.
Specifically, for example, for a trunk line by an excavator equipped with a sub trunk portion made of a small diameter face and a trunk pipe in a side of the main trunk portion of the excavator consisting of a large diameter face and a trunk pipe. This is suitably used for cutting a tunnel composed of a large-diameter main road and a small-diameter side road for temporary evacuation provided sideways. That is, in the state where the main body portion is fixed in the ground, the auxiliary body portion is protruded from the side, and further, the side road is slid back and forth along the main body portion to form the side road, The main body portion and the sub body portion are in a relationship of sliding back and forth with a large stroke. In this case, when water is stopped between the main body portion and the sub body portion, and between the sub body portion and the segment in the side road, it is composed of a plurality of brush bodies erected in an annular shape as in the present invention. By using the sealing device, the distal end portion of the elastic wire can be bent in both the front and rear directions of sliding, so that a good water stopping force can be obtained.

It is a plane schematic diagram of a middle fold type shield machine. It is an enlarged view of a bend part. BRIEF DESCRIPTION OF THE DRAWINGS It is a two-plane figure of the brush body used for the sealing apparatus concerning 1st embodiment of this invention, (a) is a front view of a curvilinear brush body, (b) is the side view, (c) is a linear type The front view of a brush body, (d) is the side view. It is a front view of the greasing type brush body used for the sealing device concerning a second embodiment of the present invention. It is a cross-sectional schematic diagram of the seal | sticker apparatus concerning 2nd embodiment of this invention, and the front trunk | drum rear-end part of an excavation machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Folding type shield machine 20 Face 21 Body pipe 22 Front trunk 23 Rear trunk 30 Middle folding part 50 Sealing device 50a, 50b Brush body 53 Sealing agent supply passage 60 Sealing agent 71 Elastic wire material 72 Brush case

Claims (3)

The face for excavation provided at the front end of the excavation direction, the front and rear cylinders provided at the front and rear in the excavation direction, and the rear end portion of the front cylinder and the front end portion of the rear cylinder are slidably overlapped with each other. A sealing device for stopping the middle folding portion of the middle folding shield machine having a middle folding portion formed by:
A brush body in which base ends of a large number of elastic wires are bound to each other to form a binding portion, and the binding portion of the brush body is fixed to the rear end portion of the superimposed front cylinder or the front end portion of the rear cylinder. And the elastic wire rod is attached to the bent portion so as to rise toward the front end of the rear barrel or the rear end of the front barrel,
A plurality of the brush bodies arranged in a ring shape adjacent to each other on the peripheral surface of the rear end of the front cylinder or the front end of the rear cylinder are arranged in multiple stages in the digging direction, and at least one of them The brush body is provided with a sealing agent supply passage for supplying a sealing agent between the multi-stage sealing devices. 2. The sealing device according to claim 1, wherein a front end portion of the elastic wire is in close contact with a peripheral surface of a front end portion of the rear cylinder or a rear end portion of the front cylinder while being bent in the digging direction and the opposite direction. The brush is formed such that a front end portion of a rear cylinder is formed in a truncated spherical shape, an inner diameter of a rear end portion of the front cylinder is larger than that of the spherical surface, and the elastic wire is raised in a radial direction of the spherical surface. The sealing device according to claim 1 or 2, wherein the body is mounted on an inner peripheral surface of a rear end portion of the front barrel.

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