JP2999133B2 - Tunnel excavator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tunnel excavator such as a shield excavator, and more particularly to a sealing device for a bent portion.

[0002]

2. Description of the Related Art FIGS. 6, 7 and 8 show a conventional folding device for sealing a bent portion of a tunnel excavator. The main body of the tunnel excavator is divided into a front body 9 and a rear body 10, which are mounted on a rear end surface of the front body 9 for supporting a propulsion jack 1.
The propulsion jack 11 is connected to the propulsion jack 11 via the propulsion jack 11 through a support fitting 13 attached to the inner peripheral surface of the rear trunk 10.

Further, the front trunk 9 and the rear trunk 10 are provided with a torque arm 20 fixed to the rear end face of the central part of the cylinder of the front trunk 9 and a rolling fixture 22 mounted on an inner peripheral surface of the rear trunk 10. They are connected by a correction jack 21.

[0004] The tunnel excavator is provided with a cutter head 8 capable of turning 360 ° at a tip end of a front trunk 9 via a turning bearing 15.
A plurality of roller cutters 16 are attached to the front surface of the roller cutter 16.

Accordingly, the cutter head 8 is rotated by an external power such as electric power or hydraulic pressure (not shown) by a plurality of cutter head drive motors 14, so that the roller cutter 16 is rotated, and the soil and rocks 2 in front of the tunnel excavator are rotated.
Excavate 7.

[0006] The excavated debris is concentrated by a debris scraping plate 17 on a debris hopper 19 installed at the center of the fuselage.
After being mounted on the belt conveyor 24, it is carried out of the machine.

Here, for propulsion of the fuselage, after the rear fuselage 10 is extended and fixed to the bedrock 27 around the fuselage by the operation of the rear fuselage gripper 23, excavation is performed by rotating the cutter head 8 while extending the propulsion jack 11. It is done by that. At this time, the gap 25 between the front trunk 9 and the rear trunk 10 is enlarged. When the propulsion jack 11 is extended to a predetermined length, the front fuselage 9 is fixed to the bedrock 27 around the fuselage by the operation of the front fuselage gripper 18 to take a reaction force, and then the operation of the fuselage gripper 23 is released to release the propulsion jack. When the body 11 is contracted, the rear trunk 10 is drawn toward the front trunk 9 and the clearance 25 is reduced. Repeat the above operation,
Promote.

Further, the excavated waste is carried out as described above, but a part thereof is not discharged to the outside.
That is, the front body 9 and the rear body 10
When the telescopic operation is performed by the propulsion operation of the front body 9 and the rear body 10,
6 may invade.

Here, a seal device 1a shown in FIG. 8 is attached as a measure against slippage from the gap 25 into the inside 26 of the machine. The illustrated sealing device 1a includes a front trunk 9 and a rear trunk 1
The lip portion of the seal 32 and the auxiliary packing 34 are attached to the outer peripheral surface of the rear body 10 by being sandwiched between the center bending guide 33 and the seal mounting bracket 35 until the ring-shaped gap between the seals 32 is
Thus, a sealing surface is formed between the sliding surface formed on the inner peripheral surface of the front trunk 9 and the intrusion of mud and rock fragments outside the machine into the machine interior 26.

FIG. 8 shows a state in which the seal is attached to the rear trunk 10 while the seal 32 is attached to the inner peripheral surface of the front trunk 9 and a sliding surface is formed on the outer peripheral surface of the rear trunk 10. There is also.

The bending operation of the tunnel excavator is performed by giving an angle α ° between the front trunk 9 and the rear trunk 10 by adjusting the amount of expansion and contraction of the plurality of propulsion jacks 11.

[0012]

A conventional sealing device 1a
Are the auxiliary packing 34 in front of the seal 32 and the seal 32
And the sealing action is generated between the mating sliding surfaces. However, since the outer packing 34 is in contact with muddy water and rock fragments, the wear and breakage of the auxiliary packing 34 are large, and the thickness of the auxiliary packing 34 is reduced due to wear of the auxiliary packing 34. If it is damaged or chipped, the auxiliary packing 3
There is a problem that the sealing property of the seal 4 is greatly reduced, muddy water and rock fragments enter the front surface of the seal 32, and the seal 32 is damaged early and the sealing property is deteriorated.

Further, the auxiliary packing 34 itself does not have a large elastic force, and cannot follow a larger folding angle than usual. Therefore, in order to improve the sealing property, the seal 32 is used.
May be installed in a plurality of stages. In this case, the sealing device 1
The mounting length of “a” becomes large, causing problems such as a decrease in the angle of the middle fold and an increase in the length of the body.

Accordingly, an object of the present invention is to reduce the wear and to prevent damage due to muddy water and rock fragments outside the machine without increasing the length of the machine body and reducing the angle of breakage, and to maintain the sealing performance for a long time. It is an object of the present invention to provide a tunnel excavator having a compact sealing device.

[0015]

To achieve the above object, the present invention is configured as follows. (1) The tunnel excavator body is divided into a plurality of cylinders in the front-rear direction, and each is connected by a propulsion jack. An elastic body such as a rubber material with high elasticity is placed on the back of a cylindrical packing made of a material that has the appropriate hardness and improved abrasion resistance in the ring-shaped space between A seal device comprising: a dust seal formed as described above; and a main seal, which is disposed in the rear row of the dust seal, has a large interference with an elastic sealing material, and can follow excessive shaft eccentricity and variation in interference. Is integrated with the folding guide.

(2) The tunnel excavator body is divided into a plurality of cylinders in the front-rear direction, and each of the cylinder bodies is connected by a propulsion jack. a ring-shaped space between the parts, the circumferential entire dimension of the body length direction one lifting the front cylinder and the rear cylinder boring stroke length of at least the time of excavation in a ring-shaped membrane
Arranged a sealing device having a Jo seal, a ring-shaped space portion of the lap portion of the front section and the rear body portion while hermetically sealed from the mud outside the body such as the film-like seal section U-shaped rigid
End ring with elasticity and fuselage ring with intermediate rigidity
Ring having a U-shaped cross section at the rear end and having flexibility
And flexible for connecting the tip ring and the body ring.
Connection ring, the relative displacement of the front and rear trunks
The take-up ring follows the
It is characterized in that it can be configured .

[0017]

According to the configuration (1), the following operations are provided. The sealing device was configured with a sealing member suitable for each function, that is, a dust-resistant large dust seal was placed in front of the sliding surface as a measure to prevent rock chips and mud sand from entering,
Further, since a main seal having a large interference and a high sealing property for sealing moisture passing through the dust seal is disposed at a later stage, the sealing performance and the durability of the sealing device can be improved. Since the center bending guide and the sealing device are integrally incorporated, the size is reduced, and the assembling dimension of the sealing device and the center bending guide in the machine length direction is reduced, so that the machine length can be reduced.

According to the configuration (2), the following operation is provided. The flexible membrane seal is deformed at the gap between the front and rear trunks following the relative displacement and angle change between the front and rear trunks when the tunnel excavator is bent inside. When the part and the rear trunk part move relative to each other, it is possible to maintain a good sealed state. The sealing mechanism becomes compact, and the length of the body can be reduced.

[0019]

FIG. 1 shows a first embodiment of a tunnel excavator according to the present invention.
Referring to FIG. 2, the tunnel excavator body is divided into a front body 9 and a rear body 10 in the same manner as in the conventional example shown in FIG.

In the figure, reference numeral 12 denotes a support fitting for attaching a propulsion jack attached to the rear end face of the front trunk 9; 13 denotes a support fitting for attaching a propulsion jack attached to the inner peripheral surface of the rear trunk; The front body 9 via the support fittings 12 and 13
A propulsion jack for connecting the and the rear trunk 10 in a bendable manner and for propelling the tunnel excavator forward is also the same as the conventional example shown in FIG. The same members as those in FIGS. 6 to 8 are denoted by the same reference numerals, and redundant description will be omitted.

The propulsion jack 11 is, as shown in FIG.
Multiple units are installed on the circumference. By the way, a tunnel excavator generally excavates hard ground such as rock, and takes a reaction force for excavation with rock 27 without generating mud and muddy water. In the case of soft ground, as shown in FIG. In some cases, a shield jack 30 and a segment assembly erector 29 for assembling the segment 31 are provided behind the tunnel excavator, and the excavation may be performed by a shield method.

Here, in the ring-shaped space between the front body 9 and the rear body 10, a sealing device 1 including a center folding guide 7 and each sealing member is mounted on the outer peripheral surface of the rear body 10, and the opposed front body 9 is provided.
The inner peripheral surface is precisely machined to form a sliding surface, and a sealing member is incorporated into the sliding surface with an appropriate interference.

As shown in FIG. 2A, the sealing device 1 is provided with a ring-shaped groove having a rectangular cross section on the outer peripheral surface of the center bending guide 7 fixed to the rear body 10 with bolts (not shown). At the outermost part of the fuselage, a packing 3 having appropriate hardness on the outer peripheral side of the groove and having improved abrasion resistance is incorporated, and an elastic body 4 such as a rubber material is provided on the inner peripheral side on the back side. , And a dust seal 2 in which the packing 3 is pressed against the sliding surface by its elasticity. Next, the grooves in the second and third rows of the center bending guide 7 are provided with a lip type so that the seal can follow the seal even if the sliding surface approaches or moves away from the seal due to the occurrence of a large shaft eccentricity and a center bending angle. Of the main seal 6 with a sufficiently large interference.

Here, the center folding guide 7 is provided at an intermediate portion between the first-stage main seal 5 and the second-stage main seal 6 at an oil supply hole 28 which penetrates the center folding guide 7 together with the rear body 10 for mounting the same.
Is connected to a lubricating oil supply line (not shown) in the machine 26 to supply lubricating oil between the first-stage main seal 5 and the second-stage main seal 6.

Next, the operation of the sealing device 1 shown in FIG. 1 will be specifically described with reference to FIG.

When the front body 9 and the rear body 10 generate a middle bending angle of α ° by the control of the propulsion jack 11 at the time of the middle bending of the tunnel excavator, outside the middle bending, as shown in FIG. As described above, the front body 9 is inclined by α ° along the center folding guide 7, and the elastic body 4 of the dust seal 2 pushes the packing 3 toward the sliding surface due to its elasticity, and the mud / rock fragments entering from the gap 25. To prevent intrusion of large foreign substances such as

Further, since the first-stage main seal 5 is resilient in the initial interference, the lip portion 5a follows and contacts the sliding surface of the front body 9 which goes away. Second stage seal 6
In this case, the lip portion 6a comes into contact with the approaching sliding surface by compressive deformation.

As shown in FIG. 2C, the inside of the middle fold shows the opposite behavior outside the middle fold, and each seal member follows the movement of the sliding surface. The description of the operation inside the center fold is omitted.

As described above, the dust seal 2 prevents intrusion of large objects such as mud and rock fragments, and the first and second main seals 5 and 6 prevent intrusion of fine mud, sand and water. ing. In addition, since the seal device 1 is integrally incorporated into the center folding guide 7, the device is compact and the size in the machine body length direction can be shortened.

Next, a second embodiment of the tunnel excavator according to the present invention will be described with reference to FIGS.

This is because the center bending guide 7 and the lip type are formed in the ring-shaped space between the front body 9 and the rear body 10 in the previous embodiment at the end of the inner peripheral surface of the front body 9 toward the rear body 10. The main seal 6, the film seal guide 40, and the seal device 1 including the film seal 41 are attached, and the outer peripheral surface of the opposing rear body 10 is finely machined to a small surface roughness to form a sliding surface. This is an example in which the seal 6 is incorporated with an appropriate interference.

The film seal 41 has a bolt 4
The U-shaped portion 40 of the film-like seal guide 40 fixed to the inner surface end of the front body 9 at 2 and having a U-shaped cross section
It is attached along a and holds the mud and sand intake shape. The rear end of the film seal 41 has a U-shaped cross section similarly to the front end, and is housed in the seal winding chamber 43 in the rear body 10 located at the rear of the cylindrical space. .

As shown in FIG. 5, the details of the sealing device 1 are as follows. At the rear end of the front body 9, the center bending guide 7 is fixed to a position closest to the inside of the fuselage with a bolt (not shown). 7, a ring-shaped groove having a rectangular cross section is provided on the inner peripheral surface, and a main seal 6 made of an elastic material such as a rubber material is incorporated into the groove.
0 so as to be pressed against the sliding surface.

Next, a film-like seal guide 40 having a ring-shaped groove having a U-shaped side surface is provided on the inner peripheral surface of the front fuselage 9 adjacent to the center folding guide 7 at a position outside the fuselage. Do not use bolts. At the U-shaped cross section 40a of the film-shaped seal guide 40, a film-shaped seal 41 is attached in close contact with the shape of the U-shaped groove. 9 Fixed to the outside of the fuselage on the inner peripheral surface of the rear end.

The film seal 41 has a central body portion attached in a ring shape along a sliding surface formed on the outer peripheral surface of the front end of the rear body 10. The film seal 41 is disposed on the rear body 10 side. It is stored in the seal take-up chamber 43 via the attached take-up seal guide 44 and the gap 45 between the sliding surfaces. At the entrance of the seal winding chamber 43, the dust seal 2
Presses the film-shaped seal 41 against the sliding surface side, so that mud and sand do not enter the seal winding chamber 43.

As shown in FIG. 4, the membrane seal 41 has a U-shaped tip ring 41a, a middle body ring 41b, a rear end U-shaped winding ring 41c, and a tip ring. It is composed of a connection ring 41d connecting the body ring 41a and the body ring 41b, and the tip ring 41a having a U-shaped cross section at the tip and the middle body ring 41b are thin metal rings, so that they are not deformed by pressure when muddy sand enters. It has rigidity. Here, the connection ring 41d and the take-up ring 41c are made of a fiber ring so as to follow the deformation of the other party. Further, the winding ring 41c at the rear end of the film-shaped seal 41 has a comb-like shape in which the front end is partially chipped, and the front end is easily wound in a ring shape in the seal winding chamber 43 of the other party. It has become.

Next, the operation of the sealing device 1 will be described with reference to FIG. When the front body 9 and the rear body 10 generate a middle bending angle of α ° by the control of the propulsion jack 11 at the time of the middle bending of the tunnel excavator, as shown in FIG. The front trunk 9 is inclined by α ° along the center-fold guide 7, and at this time, the film-shaped seal guide 40 adjacent to the center-fold guide 7 is also inclined by α °. Accordingly, the film seal 41 fixed to the rear end of the front body 9 with the bolts 42 has a front end ring 41 a having a U-shaped cross section at the front end and the U-shaped portion 4 of the film seal guide 40.
0a, the body ring 41b is retracted along the sliding surface in synchronization with the movement of the front body 9, and the rear winding ring 41c is positioned at the front end of the rear body 10. Is stored in the seal winding chamber 43.

At this time, the body ring 41b and the tip ring 4
The connection ring 41d and the winding ring 41c between 1a
The front body 9 is made of a flexible ring made of fiber.
And the rear body 10 can cope with a relative displacement due to the middle bending angle α °. In addition, the winding ring 3c has a comb-like shape with a partially chipped tip, and is initially formed into a U-shaped cross section. Is wound up and stored in the seal winding chamber 43.

Next, the film-like seal 4 is transferred to the seal winding chamber 43.
When the film seal 41 is stored, the film seal 41 passes through the gap 45.
Is pressed toward the sliding surface from the outer peripheral portion, so that mud, sand and water can be sealed. Further, a take-up seal guide 44 is attached in front of the seal take-up chamber 43, and acts as a guide so that the film seal 41 is smoothly housed in the seal take-up chamber 43.

As described above, since the film seal 41 seals the space between the front body 9 and the rear body 10, the mud and sand and
Prevent intrusion. At this time, the portion of the film seal 41 that is in strong contact with the mud and sand is formed of a metal ring, and the portion that relatively deforms is connected by a flexible fiber ring. To prevent the occurrence of

Here, the sealing device 1 is always in contact with and sliding on a sliding surface made of metal. During this time, there is a possibility that frictional heat or wear may occur. As a countermeasure, lubricating oil such as grease is supplied to the lip-type main seal 6 from an in-machine supply device (not shown) via an oil supply port 46 installed in the front body 9 as shown in FIG. An appropriate amount is always supplied between the film seals 41. As a result, an oil film is formed between the sliding surface and the seal, and smooth operation and occurrence of thermal wear can be prevented.

The inside of the center fold is as shown in FIG.
It is apparent that the sealing device 1 follows the movement of the sliding surface, exhibiting a behavior opposite to that of the center folding outside.

[0043]

According to the first aspect of the present invention, the seal members are arranged in multiple stages, and the shape of the seal member is determined by the optimum member for the foreign matter to be sealed. Can be (1) The optimal shape of the optimal member, the seal tightness and the elasticity of the back surface of the seal are increased, so that the relative angle shift due to the bending angle of the bent part and the eccentricity of the axis between the front and rear bodies. Thereby, it is possible to prevent the sealing state from being lowered. (2) For various sealed objects such as mud, rock fragments, muddy water, etc.
Each seal acts on each other to exhibit high sealing performance and prevent intrusion into the machine. That is, the dust seal prevents large foreign substances such as mud and rock pieces from entering, and the main seal prevents water from entering. (3) Since the seal device and the bending guide are integrally configured,
The size of the tunnel excavator is shortened in the length direction of the body of the tunnel excavator, so that a large bending angle can be obtained, and the length of the entire body of the tunnel excavator can be reduced.

According to the second aspect of the present invention, when the tunnel excavator is bent in the middle, the flexible film-like seal is used for the relative displacement between the front body and the rear body at the clearance between the front body and the rear body. The front body and the rear body are deformed in accordance with the change in the angle, and the front body and the rear body maintain a good sealed state during relative movement, so that the following effects can be obtained. (1) It follows the bending of the middle bent portion and the relative displacement of the front and rear trunks to prevent a decrease in sealing performance. (2) Wear and damage due to mud and sand can be prevented and durability can be improved. (3) A compact seal mechanism can be configured, and the machine length can be reduced.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a center fold section sealing device according to a first embodiment of the present invention.

FIG. 2 is an operation state diagram of the seal device according to the first embodiment.

FIG. 3 is a side sectional view of a center fold part sealing device according to a second embodiment of the present invention.

FIG. 4 is an explanatory diagram of a film seal.

FIG. 5 is an operation state diagram of the center bend portion sealing device.

FIG. 6 is a side sectional view of a conventional tunnel excavator.

FIG. 7 is a sectional view taken along the line AA of FIG. 6;

FIG. 8 is a side sectional view of the sealing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sealing device 2 Dust seal 5 Main seal 6 Main seal 7 Center bending guide 8 Cutter head 9 Front trunk 10 Rear trunk 11 Propulsion jack 25 Clearance 26 Inside machine 27 Rock rock 28 Oil supply hole 40 Film seal guide 41 Film seal 43 Seal winding chamber 44 Rewind Seal Guide

Continuation of the front page (56) References JP-A-63-217096 (JP, A) JP-A-6-108777 (JP, A) JP-A-6-8492 (JP, U) JP-A-2-6792 (JP , U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21D 9/06 301 E21D 11/00

Claims (2)

(57) [Claims] The tunnel excavator body is divided into a plurality of cylindrical bodies in the front-rear direction, and each is connected by a propulsion jack to bendable. An elastic body such as a rubber material with a high elasticity is provided on the back of a cylindrical packing made of a material having the appropriate hardness and improved wear resistance, which is arranged most outside the fuselage in the ring-shaped space between And a main seal, which is disposed in the back row of the dust seal, has a large interference with a sealing material having a high elasticity, and can follow excessive shaft eccentricity and fluctuation of the interference. A tunnel excavator, wherein a sealing device is integrated with a folding guide. 2. The tunnel excavator body is divided into a plurality of cylinders in the front-rear direction and connected by a propulsion jack to bendable. membranous sheet of the ring-shaped space, in the circumferential direction throughout the airframe one lifting a longitudinal dimension front torso and rear cylinder boring stroke length of at least the time of excavation ring between the
It arranged a sealing device having Lumpur, the ring-shaped space portion of the lap portion of the front section and the rear body portion while hermetically sealed from the mud outside the body such as the film-like seal section U-shaped rigid To
End ring and body ring with intermediate rigidity
And a take-up ring having a U-shaped flexible section at the rear end
And flexible for connecting the tip ring and the body ring.
Connection ring, the relative displacement of the front and rear trunks
The take-up ring follows the
A tunnel excavator characterized in that it can be configured .