JPH08114084A - Tunnel excavator - Google Patents

Abstract

PURPOSE: To provide a compact tunnel excavator having a high sealing property by integrating a sealing device comprising three stages of seals into a folding guide provided in a ring-shaped space portion between front and rear shells. CONSTITUTION: In a ring-shaped space portion 25 between front 9 and rear 10 shells, a folding guide 7 with a sealing device 1 attached thereto is bolted to the rear shell 10, and the inner peripheral surface of the front shell 9 is accurately machined to form a sliding surface. Three ring-shaped grooves of square cross section are provided on the outer peripheral surface of the folding guide 7, and a dust seal 2 combined with an elastic body having on its back a piece of packing with appropriate hardness and abrasion resistance is incorporated into the outermost groove, and lip type main seals 5, 6 are incorporated respectively into the second and third stages white sufficiently great interferences are provided. When the excavator is folded at its middle, the dust seal 2 elastically attaches to the sliding surface to prevent large foreign matter from entering, and the main seals 5, 6 are made to follow and intimately adhere to the sliding surface by the elastic forces of the interferences and by the compressed deformation of lip portions to prevent fine mud, sand and water, etc., from entering.

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 seal device for a center-bent portion.

[0002]

2. Description of the Related Art A conventional device for sealing a broken portion of a tunnel excavator is shown in FIGS. 6, 7 and 8. The main body of the tunnel excavator is divided into a front case 9 and a rear case 10, which are mounted on a rear end surface of the front case 9 to support a jack 1 for mounting a propulsion jack.
A propulsion jack 11 is connected to the rear body 10 so as to be bendable via a support metal 13 for mounting the propulsion jack mounted on the inner peripheral surface of the rear body 10.

Further, the front body 9 and the rear body 10 are rolling attached to a torque arm 20 fixed to the rear end surface of the cylindrical portion of the front body 9 and a support metal fitting 22 attached to the inner peripheral surface of the rear body 10. It is connected by a correction jack 21.

Here, the tunnel excavator is equipped with a cutter head 8 which can be turned 360 ° through a turning bearing 15 at the tip of the front body 9 and is further attached to this cutter head 8.
A plurality of roller cutters 16 are attached to the front surface of the.

Therefore, when the cutter head 8 is rotated by a plurality of cutter head drive motors 14 by external power such as electric or hydraulic pressure (not shown), the roller cutter 16 is rotated, and the sand and rocks 2 on the front surface of the tunnel excavator and the rock bed 2 are rotated.
Drill 7

The excavated scraps are concentrated by the scraping plate 17 in the scrapper hopper 19 installed at the center of the machine,
After being mounted on the belt conveyor 24, it is carried out of the machine.

Here, in the propulsion of the fuselage, the rear body 10 is extended and fixed to the rock 27 around the body by the operation of the rear body gripper 23, and then the propelling jack 11 is extended and the cutter head 8 is rotated for excavation. It is done by that. At this time, the clearance 25 between the front body 9 and the rear body 10 is enlarged. Then, when the propulsion jack 11 extends to a predetermined length, the front body 9 is fixed to the rock 27 around the fuselage by the operation of the front body gripper 18 to release the reaction force, and the operation of the rear body gripper 23 is released to release the propulsion jack. When 11 is contracted, the rear body 10 is pulled toward the front body 9 side, and the clearance 25 is reduced. Repeat the above operation,
Promote.

Further, the excavated chips are carried out to the outside as described above, but a part of them is not discharged to the outside of the machine body.
That is, the front body 9 and the rear body 10 are left on the outer peripheral portions of the front body 9 and
When the expansion / contraction motion of the front body 9 and the rear body 10 due to the propulsion operation is clogged due to the clearance 25 at the connecting portion between the rear body 10 and the rear body 2,
There is a risk of breaking into 6.

A seal device 1a shown in FIG. 8 is attached as a measure against slippage from the clearance 25 into the machine interior 26. The illustrated sealing device 1a includes a front body 9 and a rear body 1.
It is attached to the outer peripheral surface of the rear case 10 by being sandwiched by the center folding guide 33 and the seal mounting metal fitting 35 up to the ring-shaped clearance between 0, and the lip portion of the seal 32 and the auxiliary packing 34.
Thus, a sealing surface is formed between the sliding surface and the sliding surface formed on the inner peripheral surface of the front body 9 to prevent dirt and rock fragments outside the machine from entering the inside 26.

Although FIG. 8 shows a state in which the rear body 10 is mounted, a seal 32 is mounted on the inner peripheral surface of the front body 9 and a sliding surface is formed on the outer peripheral surface of the rear body 10. There is also.

Further, the bending operation of the tunnel excavator is performed by adjusting the expansion and contraction amounts of the plurality of propulsion jacks 11 to give an angle α ° between the front body 9 and the rear body 10.

[0012]

A conventional sealing device 1a.
Is the auxiliary packing 34 and the seal 32 in the preceding stage of the seal 32.
And, the sealing action is generated between the mating sliding surfaces, but since the outer side of the auxiliary packing 34 is in contact with muddy water / rock fragments, the probability of wear and breakage is large, and the auxiliary packing 34 wears and the wall thickness decreases. Auxiliary packing 3
There was a problem that the sealing property of No. 4 was significantly reduced, and muddy water / rock fragments invaded the front surface of the seal 32, and the seal 32 was damaged early and the sealing property was degraded.

Further, the auxiliary packing 34 does not have a large elastic force by itself, and cannot follow a bending angle larger than usual. Therefore, in order to improve the hermeticity, the seal 32
In some cases, the sealing device 1 is installed.
The attachment length of a becomes large, which causes problems such as a decrease in the center bending angle and an increase in the length of the machine body.

Therefore, an object of the present invention is to prevent the increase of the length of the machine body and the decrease of the bending angle of the machine body, to reduce the wear due to the muddy water and rock fragments outside the machine, to prevent the damage, and to maintain the sealing performance for a long time. It is to provide a tunnel excavator having a compact sealing device that can be used.

[0015]

In order to achieve the above-mentioned object, the present invention is constructed as follows. (1) In a tunnel excavator in which a tunnel excavator main body is divided into a plurality of cylindrical bodies in the front-rear direction and connected by propulsion jacks, and is bendable, a front excavator main body and a rear trunk of the tunnel excavator main body are combined. In the ring-shaped space between them, the elastic body such as rubber is placed on the back of the cylindrical packing, which is placed on the outermost side of the machine body and is made of a material with appropriate hardness and improved wear resistance. And a main seal which is arranged in the rear row of the dust seal and has a large tightening allowance with a sealing material rich in elasticity and which can follow excessive shaft eccentricity and fluctuation of the tightening allowance. Is characterized in that it is built in integrally with the center folding guide.

(2) In the tunnel excavator in which the tunnel excavator main body is divided into a plurality of cylinders in the front-rear direction and connected by propulsion jacks to enable bending, in the front excavator main body and the rear trunk of the tunnel excavator main body. In the ring-shaped space between the two parts, the dimension in the longitudinal direction of the body is longer than the excavation stroke of the front body and the rear body during excavation in the entire circumferential direction, and it is ring-shaped and both ends are U-shaped in cross section. A sealing device having a flexible film-shaped seal of a mold is provided, and the ring-shaped space portion of the lap portion between the front body portion and the rear body portion is hermetically sealed from muddy water outside the body.

[0017]

According to the configuration (1), the following action is obtained. The sealing device is composed of sealing members suitable for each function, that is, as a measure to prevent intrusion of rock fragments and mud sand, a large abrasion resistant dust seal is placed in front of the sliding surface.
Further, since a main seal having a large tightening margin and a large sealing property for sealing the moisture that has passed through the dust seal is arranged in the subsequent stage, the sealing performance of the sealing device and the durability thereof are improved. Since the center folding guide and the seal device are integrally assembled, the size is made compact, and the assembly size of the seal device and the center folding guide in the machine length direction is small, and the machine length can be reduced.

According to the configuration of (2), the following action is obtained. When the tunnel excavator is bent in the middle, the flexible film seal deforms following the relative displacement and angle change between the front and rear trunks at the clearance between the front and rear trunks. It is possible to maintain a good sealed state when the rear portion and the rear portion move relative to each other. The seal mechanism becomes compact and the length of the machine can be reduced.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the tunnel excavator of the present invention is shown in FIG.
2 and FIG. 2, first, the tunnel excavator body is divided into a front body 9 and a rear body 10 as in the conventional example shown in FIG.

In the figure, 12 is a supporting metal fitting for mounting the propulsion jack mounted on the rear end surface of the front body 9, 13 is a supporting metal fitting for mounting the propulsion jack mounted on the inner peripheral surface of the rear body, and 11 is these. Front body 9 through support metal fittings 12 and 13
The rear jack 10 and the rear barrel 10 are bendably connected to each other, and a propelling jack for propelling the tunnel excavator forward is the same as in the conventional example shown in FIG. The same members as those in FIGS. 6 to 8 are designated by the same reference numerals, and duplicate description will be omitted.

The propulsion jack 11, as shown in FIG.
There are several on the circumference. By the way, a tunnel excavator generally excavates hard ground such as rock, and the reaction force for excavation is taken by the rock 27 without generating mud or muddy water. However, in the case of soft ground, as shown in FIG. In some cases, a shield jack 30 for assembling the segment 31 and a segment assembling erector 29 are provided at the rear of the tunnel excavator, and the excavation is performed by the shield method.

Here, in the ring-shaped space between the front body 9 and the rear body 10, the center folding guide 7 and the sealing device 1 including each sealing member are attached to the outer peripheral surface of the rear body 10, and the front body 9 facing each other is attached.
The inner peripheral surface is precisely machined to form a sliding surface, and a sealing member is incorporated in the sliding surface with an appropriate tightening allowance.

As shown in FIG. 2 (a), the details of the sealing device 1 include a ring-shaped groove 3 having a quadrangular cross section formed on the outer peripheral surface of the center folding guide 7 which is fixed to the rear body 10 by a bolt (not shown). A packing 3 having an appropriate hardness on the outer peripheral side of the groove and having improved wear resistance is installed at the outermost part of the machine body, and an elastic body 4 such as a rubber material is provided on the inner peripheral side which is the back surface thereof. And the dust seal 2 in which the packing 3 is pressed against the sliding surface by its elasticity. Next, in the grooves in the second and third rows of the center folding guide 7, a lip type is used so that the seal can follow even if the sliding surface approaches and moves away from the seal due to large axial eccentricity and center bending angle. Assemble the main seal 6 with a sufficiently large tightening margin.

Here, the center folding guide 7 is located at an intermediate portion between the first-stage main seal 5 and the second-stage main seal 6 and the oil supply hole 28 which penetrates the center folding guide 7 together with the rear body 10 for mounting the same.
Is provided and connected to a lubricating oil supply line (not shown) inside 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 tunnel excavator is folded in the middle, the front body 9 and the rear body 10 generate an α ° middle folding angle by the control of the propulsion jack 11, and outside the middle folding, the state shown in FIG. As described above, the front body 9 is inclined by α ° along the center bending guide 7, and the elastic body 4 of the dust seal 2 pushes the packing 3 toward the sliding surface side by its elasticity, and the mud / rock fragments entering through the clearance 25. Etc. to prevent the entry of large foreign objects.

Further, since the elastic force acts on the first-stage main seal 5 in the initial tightening margin, the lip portion 5a follows the sliding surface of the front case 9 which is moving away from the main seal 5 and comes into contact therewith. Second stage seal 6
Comes into contact with the approaching sliding surface due to the compressive deformation of the lip portion 6a.

Inside the center fold, as shown in FIG. 2C, the opposite behavior of the outside of the center fold is exhibited, and each seal member follows the movement of the sliding surface. The description of the action inside the center fold is omitted.

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

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

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

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

As shown in FIG. 5, the details of the sealing device 1 are as follows. The middle folding guide 7 is fixed by a bolt (not shown) at the rear end of the front body 9 and at the position closest to the inside of the machine body. A ring-shaped groove having a quadrangular cross section is provided on the inner peripheral surface of 7, and a main seal 6 made of an elastic material such as a rubber material is incorporated in the groove, and the elastic force of the main seal 6 opposes the main seal 6 to the rear body 1
It is installed by pressing it against the sliding surface of 0.

Next, a film-shaped seal guide 40 having a ring-shaped groove having a U-shaped side surface is provided at a position outside the fuselage on the inner peripheral surface of the front case 9 adjacent to the center folding guide 7. Do not install with bolts. In the U-shaped section 40a of the membrane seal guide 40, a membrane seal 41 is attached in close contact along the shape of the U-shaped groove, and one end of the membrane seal 41 is attached to the front body by a bolt 42. 9 Fixed to the outside of the fuselage on the inner surface of the rear end.

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

As shown in FIG. 4, the membrane seal 41 has a tip ring 41a having a U-shaped cross section at its tip, an intermediate body ring 41b, a winding ring 41c having a U-shaped cross section at the rear end, and a tip ring. 41a and a body ring 41b are connected to each other by a connecting ring 41d. The tip ring 41a having a U-shaped cross section at the tip and the body ring 41b in the middle are thin metal rings. It has rigidity. Here, the connection ring 41d and the winding ring 41c are made of fiber rings so as to follow the deformation of the other party. Further, the take-up ring 41c at the rear end of the film-like seal 41 has a structure in which the front end is partially chipped and has a comb-teeth shape, and the front end is easily wound up in a ring shape in the seal wind-up chamber 43 of the other party. 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 center-bending angle of α ° under the control of the propulsion jack 11 when the tunnel excavator is center-broken, as shown in FIG. The front body 9 is inclined by α ° along the center folding guide 7, and at this time, the film seal guide 40 adjacent to the center folding guide 7 is also inclined by α °. Therefore, in the film-like seal 41 fixed to the rear end of the front body 9 with the bolt 42, the U-shaped portion 4 of the film-like seal guide 40 has the tip ring 41 a having a U-shaped cross section at the tip.
The body ring 41b is retracted along the sliding surface in synchronism with the movement of the front body 9, and the rear winding ring 41c is located at the tip of the rear body 10 although it is attached along with 0a. It 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 the 1a are
As it is made of fiber and consists of a flexible ring, the front body 9
It is possible to cope with the relative displacement between the rear body 10 and the middle bending angle α °. Further, the take-up ring 3c has a comb-teeth shape in which the tip is partially cut off, and is formed in a U-shaped cross section at the beginning, so that when the film-like seal 41 is compressed in the longitudinal direction, it is automatically formed. Then, it is wound and stored in the seal winding chamber 43.

Next, the film seal 4 is transferred to the seal winding chamber 43.
1 is stored, the film-like seal 41 passes through the gap 45, but the film-like seal 41 is made by the elastic dust seal 2.
Since is pressed from the outer peripheral portion toward the sliding surface, it is possible to seal mud and sand and water. 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 stored in the seal take-up chamber 43.

As described above, the film-like seal 41 seals between the front case 9 and the rear case 10, so that mud and sand and water can be absorbed inside the machine 26.
Prevent infiltration. At this time, in the film-like seal 41, the portion that strongly contacts the mud and sand is composed 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 constantly in contact with and slides on the sliding surface made of metal, and there is a possibility that frictional heat or abrasion occurs during this period. As a countermeasure against this, lubricating oil such as grease is supplied to the lip-type main seal 6 from a supply device inside the machine (not shown) via the oil supply port 46 installed in the front case 9 as shown in FIG. An appropriate amount is constantly 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 thermal wear can be prevented.

As shown in FIG. 5B, the inside of the center fold is
It is clear that the sealing device 1 behaves in the opposite manner to the outside of the center fold and follows the movement of the sliding surface.

[0043]

According to the invention of claim 1, since the seal members are arranged in multiple stages and the shape of each seal member is made of the optimum member for the foreign matter to be sealed, the following effects can be obtained. To be (1) Relative displacement due to the bending angle of the middle bent part and the axial eccentricity of the front and rear torso due to the optimum shape of the member and the large seal tightening margin and elasticity of the seal back surface. As a result, it is possible to prevent the sealed state from being deteriorated. (2) For various sealed objects such as mud, rock fragments, muddy water,
Each seal exerts its own high sealing performance to prevent it from entering the machine. In other words, the dust seal prevents the entry of large foreign matter such as mud and rock fragments, and the main seal prevents the entry of water. (3) Since the sealing device and the center folding guide are integrally configured,
The size of the tunnel excavator is shortened in the machine length direction, a large bending angle can be obtained, and the length of the whole machine body can be reduced.

According to the second aspect of the present invention, the flexible film-like seal is provided with the relative displacement of the front body portion and the rear body portion at the clearance between the front body portion and the rear body portion when the tunnel excavator is bent in the middle. The front body portion and the rear body portion are deformed in accordance with the change in angle, and the sealed state is favorably maintained during the relative movement of the front body portion and the rear body portion. (1) It is possible to prevent the deterioration of the sealing performance by following the bending of the middle bent portion and the relative displacement between the front body and the rear body. (2) It is possible to prevent wear and damage due to mud and sand and improve durability. (3) A compact seal mechanism can be configured and the machine length can be shortened.

[Brief description of drawings]

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

FIG. 2 is a diagram showing an operating state of the middle bent portion sealing device.

FIG. 3 is a side sectional view of a center-folded portion sealing device according to a second embodiment of the present invention.

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

FIG. 5 is a working state diagram of the middle bent portion sealing device.

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

7 is a cross-sectional view taken along the line AA of FIG.

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

[Explanation of symbols]

 1 Sealing device 2 Dust seal 5 Main seal 6 Main seal 7 Middle folding guide 8 Cutter head 9 Front body 10 Rear body 11 Propulsion jack 25 Clearance 26 Inboard 27 Rock 28 Oil supply hole 40 Membrane seal guide 41 Membrane seal 43 Seal winding room 44 Winding seal guide

Claims (2)

[Claims] 1. A tunnel excavator body in which a tunnel excavator body is divided into a plurality of cylinders in a front-rear direction and connected by propulsion jacks so that the tunnel excavator body is bendable. In the ring-shaped space between the and the outermost part of the machine, an elastic body such as a highly elastic rubber material is provided on the back surface of the cylindrical packing made of a material with appropriate hardness and improved wear resistance. And a main seal that is arranged in the rear row of the dust seal and has a large tightening allowance with a highly elastic sealing material and that can follow excessive shaft eccentricity and fluctuation of the tightening allowance. A tunnel excavator characterized in that a sealing device is integrally incorporated with a center bending guide. 2. A tunnel excavator body in which a tunnel excavator body is divided into a plurality of cylinders in a front-rear direction and connected by propulsion jacks so as to be bendable. In the ring-shaped space between and, the dimension in the longitudinal direction of the machine is longer than the excavation stroke of the front body and the rear body during excavation in the entire circumferential direction, and it is ring-shaped and has U-shaped cross sections at both ends. A tunnel excavator characterized by arranging a sealing device having a flexible film-like seal and sealingly sealing a ring-shaped space portion of a lap portion between a front body portion and a rear body portion from muddy water or the like outside the body. .