JP3069506B2 - Folding shield 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 center fold, which is constructed so that a shield body is divided into a plurality of shields and adjacent ends of the shields are fitted to each other so as to be rotatable. The present invention relates to a shield excavator, and more particularly, to an improved bent-sealing means for maintaining a fitting gap between adjacent ends of a plurality of shields in a sealed state.

[0002]

2. Description of the Related Art In a shield machine for excavating an underground pit such as a tunnel, there is a case where it is necessary to change a direction of excavation and make a turn, for example, when excavating a curved tunnel. Especially, recently, the construction of underground tunnels using shield excavators has been concentrated in urban areas, and there are various restrictions on excavating underground tunnels. Is growing.
As a shield excavator that meets these needs, the shield body is divided into a plurality of shields, the adjacent ends of each shield are fitted together, and the front shield can be rotated horizontally with respect to the rear shield A so-called center-bent shield excavator in which the shield main body is configured to be able to be bent in the middle by doing so has been generally known. In this center-bent shield excavator, the fitting gap between the adjacent ends of the shields fitted to each other is kept in a sealed state to prevent intrusion of excavated earth and sand or muddy water into the shield body. A center-fold seal is provided in the fitting gap. Depending on the model of the center-bending shield excavator, the fitting gap of the shield hardly changes in the process of operating the shield body in a middle-folding manner, and sometimes greatly changes. The center-fold seal receives a compressive force in the height direction due to the change in the gap of the shield at the time of such a center-folding operation, and furthermore, the shield rotates while receiving such a compressive force. Since a force is also applied in the direction along the operation, the body is complicatedly deformed in the height direction and the width direction. The amount of change in the shield gap that causes such deformation of the center-fold seal differs depending on the center-fold system of the center-fold mechanism of the center-bend shield excavator and the maximum center-fold angle set by design. If the amount is different, the configuration of the middle fold seal used will naturally be different.

With regard to the middle bend seal used when the amount of change in the fitting gap of the shield is large, as the middle bend seal, for example, a hollow lip middle bend seal 20 as shown in FIG. 7 is used. Have been. The center fold seal 20 is composed of a back part 21 formed of a flat bottom wall and an abdominal part 22 formed of a convex wall whose upper surface forms a substantially arcuate curved surface. A hollow body having a protruding portion 24 formed at the center of the abdomen 22.
The middle fold seal 20 shown in FIG. 7 is different from the middle fold seal 20 due to the middle bending operation of the shield body at a large middle bending angle and a large change in the fitting gap of the shield accompanying the middle bending operation.
Even if a large force in the direction along the turning operation of the shield or a large force such as crushing is applied, the shield body is deformed following the middle bending operation due to the good flexibility of the hollow portion 23 of the middle bending seal 20. Or, it is deformed so as to spread in the lateral direction, and can be freely adapted to the bending operation. Also,
In this case, since the projection 24 at the center of the abdomen 22 makes strong contact with the seal sliding surface of the shield, the intrusion of excavated earth and sand, muddy water, and the like from the outside can be effectively prevented. Such a foldable seal 20 with a lip is hollow and has difficulty in strength as compared with a solid seal. In addition, the seal 20 is originally used under severe operating conditions that require severe deformation. For this reason, as shown in FIG. 8, usually, a plurality of stages are mounted on the seal mounting portion 26 of the shield 25 forming the front body. In the case of adopting such a configuration, as shown in the figure, a plurality of stages of the middle fold seals 20 are lubricated with grease or the like through pockets 27 between the seals through a lubricant supply passage 28 in the seal mounting portion 26. By allowing the material to be injected, the lubricant can be appropriately supplied as needed. This lubricating material forms an oil film between the seal sliding surface 29a formed on the shield 29 forming the rear body and the center-fold seal 20, so that the wear of the center-fold seal 20 and the external It is necessary to prevent intrusion of excavated earth and sand from the sea.

[0004] The hollow bendable seal shown in Fig. 7 is suitable for a bendable shield excavator of a model in which the fitting gap of the shield is largely changed by the bend operation of the shield body. On the other hand, since it becomes large due to the formation of the hollow portion, it is unsuitable for a mid-bent shield excavator of a model where the fitting gap of the shield does not greatly change. In other words, in the latter model of the mid-bent shield excavator, since the fitting gap of the shield does not change significantly, even if the seal margin is increased by using such a mid-bend seal, the manufacturing cost increases but the practical use only increases. There is no merit. For this reason, the so-called semi-cylindrical shield excavator, which is designed so that the gap between the shields does not change significantly, has a flat bottom surface and a substantially circular top surface, and a solid inside. Fold seal was used.

[0005] Such a mid-bend shield excavator using a kamaboko type mid-bend seal corresponds to the prior art on which the present invention is based, and an example of its structure is shown in FIGS.
This will be described in detail below. FIG. 4 is an overall plan view of a conventional bent-type shield excavator in which a part of the structure is cut away to show the structure of a main part, FIG. 5 is an enlarged vertical sectional view of a part A in FIG. FIG. 5 is an enlarged vertical sectional view showing a center folding mechanism of the center folding shield machine shown in FIG. 4.

[0006] In a center-bend shield excavator whose structure is exemplified in Figs. 4 to 6, the shield body is composed of two shields, a front trunk and a rear trunk, and the front trunk can be rotated only in the horizontal direction. It is of the type as described above. The structure will be described. In these figures, reference numeral 1 denotes a front trunk portion provided with a cutter head in the forward direction, which is a digging direction, and 1a denotes a middle folding seal provided at a rear end of the front trunk portion 1. A seal attachment part for attaching the rear body part, which constitutes a shield body of the center folding shield machine together with the front body part 1,
Reference numeral 2a denotes a seal sliding surface formed on the outer periphery of the front end of the rear trunk portion 2. Reference numeral 3 denotes a propulsion jack attached to the rear trunk portion 2 for propelling the shield main body while taking a reaction force by the segments. The front trunk portion 1 is a seal mounting portion 1a forming a rear end portion.
The shield body is configured to be able to be bent in the middle by fitting horizontally to a seal sliding surface 2a forming an outer surface of a front end portion of the rear trunk portion 2 so as to be able to rotate in a horizontal direction.

Reference numeral 4 denotes a center bending jack which is pivotally mounted on the front body 1 and the rear body 2 so as to be able to swing the shield main body, and 5 denotes a front body 1 which is rotated with respect to the rear body 2. A center pin 6 for supporting the shaft as much as possible, 6 is a semi-circular folded seal attached to the seal attachment portion 1a of the front body 1, and 7 is attached to the front body 1 via a base 8 so that the front body 1 The rear torso 2
A connecting bracket 9 for connecting to the center pin 5 is provided at the front end of the rear body 2.
And a connecting bracket holding device formed of a pair of members that are supported by and supported by the bracket. Although not shown, a plurality of center bending jacks 4 are provided symmetrically with respect to the vertical center line of the mating ends of the body portions 1 and 2, that is, the vertical center line of the shield body. ing. Center pin 5
As shown in FIG. 6, a pair of upper and lower bodies are provided on a vertical center line of the shield body, and the front body 1 is turned around the upper and lower center pins 5 with respect to the rear body. It is configured to be able to move. Therefore, the connection bracket 7 and the connection bracket holding tool 9 for holding the connection bracket 7 are provided.
Are also provided at two places above and below the shield body,
Are pivotally supported by the center pin 5 on the rear trunk 2 via these means. The middle fold seal 6 is shown in FIG.
As shown in FIG. 1, the bottom surface is flat, the top surface is substantially arc-shaped, and the inside is solid and semi-cylindrical. Can be attached only one step with the embedded. Like the other middle-folded seals, this semicircular folded seal 6 seals the gap between the shields, that is, the gap between the inner surface of the rear end of the front body 1 and the outer surface of the front end of the rear body 2. Holds the body to prevent intrusion of excavated earth and sand, muddy water, etc.

[0008] In this conventional bent-type shield excavator, the rotation axis of the front body 1, that is, the center-folded center line is located on the vertical center line of the shield body. Therefore, the seal sliding surface 2a of the rear body 2 is spherically machined with a spherical surface having a diameter substantially equal to the inner diameter of the front body 1 around the center point of the vertical center line. Therefore, the rear end of the front body 1 slides with respect to the center-fold seal sliding surface 2a of the rear body 2 through the center-fold seal 6 with the vertical center line of the shield body as the rotation axis. It can rotate in the horizontal direction while moving. In a middle-bend shield excavator that has a center-bending mechanism in which the seal sliding surface is subjected to spherical processing and the shield is rotated around a center pin, the shield fitting Does not substantially change at any point in the circumferential direction irrespective of the magnitude of the middle fold angle, so that the middle fold seal does not need to have great flexibility and does not require a large margin for the middle fold seal. For this reason, as described above, in the past, as described above, in the case of a semi-bent shield excavator designed so that the gap between the shields does not change significantly, a semi-finished, semi-structured mid-fold seal was used. is there.

[0009]

[0005] As described above, a semi-folded mid-fold seal is used for a mid-fold shield excavator designed so that a fitting gap of the shield does not largely change. It is not used under severe operating conditions like a bent seal, and it is solid and has a higher strength than a hollow bent seal. I was able to. And
If such a Kamaboko-shaped bent seal is intentionally provided in multiple stages, the seal mounting part becomes longer in the axial direction of the shield in order to secure the installation space. There is also a problem that the length must be longer than necessary. For this reason, in the past, it has been established in the field technology that only a single-stage folded-seal is provided for a Kamaboko-shaped folded-seal, and a lubricant is required between this and the seal sliding surface of the shield. There has not been provided any other kind of lubricating material supply mechanism for enabling appropriate supply. Therefore, as a means for forming an oil film between the center-folded seal and the seal sliding surface of the shield, a method of forming an oil film by hand coating using a brush or the like on the surface of the kamaboko-shaped center-folded seal has been adopted. However, such a method lacks reliability with respect to the performance of preventing wear of the center-fold seal and intrusion of excavated earth and sand from the outside.

An object of the present invention is to solve the problems of the prior art. In a center-bend type shield excavator using a camber-shaped center-bend seal, the center-bend seal and a seal sliding surface of the shield are provided. To provide a middle bend shield excavator provided with a middle bend sealing means so that a lubricant can be appropriately supplied as necessary between them and the shield sliding surface of the shield does not need to be lengthened. The purpose is to:

[0011]

SUMMARY OF THE INVENTION An object of the present invention is to provide a "container comprising a plurality of shields, wherein adjacent shield ends are fitted to each other to rotate a front shield with respect to a rear shield. The shield body includes a shield body that is configured to be capable of being folded by being movable, and a middle folding jack that is provided between adjacent shields and that drives the shield body to be folded in the middle. The shield body is provided at an end of the shield. A mid-fold type shield excavator in which a solid kamaboko-shaped mid-fold seal is attached to the seal mounting section to keep the gap between adjacent ends of the shield sealed. Attach the foldable seal to the outside of the machine at the seal mounting part, and leave a gap between the Kamaboko-shaped center-folded seal and the lubricating material holding space so that it can be formed. A solid solid bend seal with a low height is attached to the inside of the machine at the shield mounting part, and a lubricant supply path for supplying lubricant to the lubricant holding space formed by these pair of bent seals is sealed. The present invention is achieved by a bent-type shield excavator as described in claim 1 of the claims.

[0012]

The middle folding shield machine according to the present invention has the above-described structure, so that the lubricant can be supplied to the lubricant holding space through the lubricant supply passage. Even with a folding shield machine, it is possible to appropriately supply a lubricant between the center folding seal and the seal sliding surface of the shield.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an enlarged vertical sectional view showing a main part of a mid-fold shield excavator according to an embodiment of the present invention. FIG. 2 is an arrow B of FIG.
FIG. 3 is an enlarged vertical sectional view of a portion C in FIG. In FIGS. 1 to 3, the parts denoted by the same reference numerals as those in FIGS. 4 to 6 represent the same parts as those in these drawings, and thus will not be described in detail in order to avoid redundant description.

1 to 6, the shield folding machine to which the present invention is applied as an embodiment has a shield body having a front body portion similar to that of the conventional example shown in FIGS. 1 and the rear body 2, and the center bending mechanism performs the above-described spherical processing on the seal sliding surface 2 a of the rear body 2 and a pair of upper and lower parts on the vertical center line of the shield body. A center-bending mechanism that rotates the front body 1 around a center pin provided is adopted.
That is, in the present embodiment, the shield folding machine of the present embodiment is configured such that the seal mounting portion 1a forming the rear end of the front body 1 is fitted to the spherically-sealed seal sliding surface 2a forming the outer surface of the front end of the rear body 2. The shield body is constructed so that it can be folded in the middle by being pivotally mounted on the center pin 5 so as to be able to rotate in the horizontal direction, and pivotally attached to the front body part 1 and the rear body part 2 so as to be swingable. Bending jack 4 that drives the shield body in bending
And Further, a semi-cylindrical bent seal 6 having a solid inside is attached to the seal attachment portion 1a, and the front body 1
The gap between the inner surface of the rear end portion and the outer surface of the front end portion of the rear trunk portion 2 is kept in a sealed state. In a basic configuration, a conventional folding type shield excavating device shown in FIGS. There is no difference with the machine.

Therefore, the characteristic structure of the intermediate bend shield machine according to the embodiment of the present invention will be described with reference to FIGS. 1 to 3. In addition to attaching the above-mentioned Kamaboko-shaped middle folding seal 6 to the seal attaching portion 1a, a small O-ring small compact folding seal 10 having a lower height than this Kamaboko-shaped middle folding seal 6 is attached. ing. The semicircular folded seal 6 is attached to the outer side of the seal mounting portion 1a, that is, the side where earth and sand are likely to enter, and the small O-ring type semicircular seal 10 is disposed between the semicircular folded seal 6 and the semicircular folded seal 6. At a slight distance from the shield mounting part 1
a. By adopting such a configuration, a lubricating material holding space portion for holding the lubricating material is formed between the semicircular folded-seal 6 and the small-sized folded-seal 10, and the lubricant is supplied to this space. In this case, the lubricating material is held by the pair of folding seals 6, 10. Therefore, a lubricant supply passage 11 for supplying a lubricant is formed in the seal mounting portion 1a.

More specifically, these structures will be described below. In mounting the semicircular folded seal 6 and the O-ring type small folded seal 10 to the seal mounting portion 1a, in this embodiment, the outer side and the outer side of the machine are used. On the inside, a seal storage groove 1c having a concave cross section and a seal storage groove 1d having a concave cross section having a smaller depth than the seal storage groove 1c are formed along the inner peripheral surface of the seal mounting portion 1a, respectively. In the seal mounting groove 1d having a shallow depth, an O-ring type small-sized bent seal 10 is mounted in a single-stage shape with the bottom buried. In this way, each of the folding seals 6, 1
When 0 is attached, both middle bend seals have the same height at the top and are in close contact with the seal sliding surface 2a, and a space is formed between these middle bend seals 6 and 10 to hold the lubricant. . The seal mounting portion 1a is formed with a lubricant supply port 13 that opens into the machine so that a lubricant supply hose 12 can be connected as necessary from the machine to supply the lubricant appropriately. The lubricant injection port 14 for injecting the material into the material holding space is provided with the seal housing groove 1c and the seal housing groove 1d.
Is formed on the wall between them. The lubricating material supply port 13 and the lubricating material injection port 14 are provided at a plurality of positions with the phase thereof changed in the circumferential direction of the seal mounting portion 1a, so that the lubricating material can be uniformly supplied to the entire lubricating material holding space. ing. In addition, the lubricant supply passage 11 is formed in the seal mounting portion 1a so as to pass below the shallow seal storage groove 1d, that is, to pass through the outer peripheral side of the seal mounting portion 1a.
3 and the lubricant injection port 14.

Since the present embodiment has such a configuration, the lubricant supply port 13 opened in the machine is connected to the lubricant supply hose 12 as needed, and the lubricant is supplied appropriately. The lubricant can be supplied from the lubricant injection port 14 to the lubricant holding space through the lubricant supply passage 11. Lubricant can be supplied between the shield and the sliding surface of the shield as needed. Also,
The center-fold seal 10 functions only to hold the lubricating material functionally, and the role of preventing the penetration of excavated earth and sand into the shield main body is substantially assigned to the Kamaboko-shaped center-fold seal 6. As a result, an O-ring type having a low height can be used, and the size can be reduced. As a result, the seal mounting portion does not need to be elongated in the axial direction of the shield, and accordingly, the seal sliding surface does not become unnecessarily long in the front-rear direction. In the present embodiment, an O-ring type small-sized seal is used, but if the height is lower than the Kamaboko-shaped solid seal, the same applies even if another type of solid seal is used. In this case, the height is preferably set to 1/3 to 2/3 of the height of the folded sheet seal of the kamaboko shape. In other words, even if such a small bent seal is used, it is possible to hold the lubricant and supply the lubricant, as well as to reduce the height of the seal as an index of the size of the seal. Since the width can of course be reduced, it is not necessary to lengthen the seal mounting portion in the axial direction of the shield. Further, the lubricant supply passage passing below the seal accommodating groove of the center-fold seal can be formed without difficulty without increasing the plate thickness of the seal mounting portion.

As shown in FIG. 3, the semicircular folded seal 6 has a flat bottom surface and a substantially arc shape with a radius r, and a side portion of the substantially arc-shaped top surface. A chamfered portion 6a is formed and chamfered. The middle fold seal 6
By forming such a chamfered portion 6a, even when the shield main body is greatly deformed during the middle bending operation and spreads in the width direction so that the upper surface side is crushed, it is protruded from the seal storage groove 1c. It is not pressed against the corner of the groove wall or deformed unnaturally.
Therefore, when such a configuration is adopted for the semi-folded seal 6 in the shape of a kamaboko, the effect that damage can be prevented can be expected.

The half-fold shield machine according to the present embodiment has, in addition to the above-described half-fold sealing means, an additional structure.
Means are provided for removing soil and the like adhering to the seal sliding surface 2a of the rear body 2 during excavation and cleaning the inside of the machine. That is, at the front end of the rear trunk 2, a pressure water supply pipe 15 is provided to penetrate a rear part of the seal sliding surface 2 a to which the soil and the like are most likely to adhere so as to be exposed to the ground side so that pressure water can be sprayed appropriately. In addition, soil and the like adhered and solidified on the sliding surface of the seal are removed from the inside of the machine to be cleaned. Such pressure water supply pipes 15 are provided at a plurality of locations on the sliding surface of the seal with their phases changed in the circumferential direction, and are closed with blind plugs when not in use.

[0020]

As is apparent from the above description, the present invention relates to a mid-fold type shield excavator using a semi-circular center-folded seal, in which the semi-circular mid-fold seal is attached to the outside of the machine at the seal mounting portion. , With enough space between the lubricating material holding space and the kamaboko-shaped mid-fold seal to attach the solid mid-fold seal at a height lower than the A lubricating material supply path for supplying lubricant to the lubricating material holding space formed by the pair of folded-in seals is formed in the seal mounting portion. Even in the case of a mid-bend shield excavator, lubricant can be appropriately supplied between the mid-bend seal and the seal sliding surface of the shield as necessary, and the seal sliding surface of the shield can be lengthened. Ku even need.

[Brief description of the drawings]

FIG. 1 is an enlarged vertical cross-sectional view showing a main part of a mid-fold shield excavator according to an embodiment of the present invention.

FIG. 2 is a view in the direction of arrow B in FIG. 1;

FIG. 3 is an enlarged vertical sectional view of a portion C in FIG. 1;

FIG. 4 is an overall plan view of a conventional bent-type shield excavator in which a part of the structure is cut away to show a structure of a main part thereof.

FIG. 5 is an enlarged vertical sectional view of a portion A in FIG. 4;

FIG. 6 is an enlarged longitudinal sectional view showing a center folding mechanism of the center folding shield machine shown in FIG. 4;

FIG. 7 is an enlarged cross-sectional view of a center-fold seal for explaining the technical background of the conventional center-fold shield machine.

FIG. 8 is a longitudinal sectional view of a main part of the center bend shield excavator showing a use mode of the center bend seal in FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front trunk part 1a Seal attachment part 2 Rear trunk part 2a Seal sliding surface of rear trunk part 4 Center bending jack 5 Center pin 6 Kamaboko type center bending seal 10 O-ring type small center bending seal 11 Lubricant supply path

Claims (2)

(57) [Claims] 1. A shield comprising a plurality of shields, wherein adjacent ends of the shields are fitted to each other so that a front shield can be rotated with respect to a rear shield so that the shield can be folded. It is provided with a main body and a folding jack that is provided between adjacent shields and drives the shield main body to be bent in the middle. In a mid-bend shield excavator in which a foldable seal is attached to keep a gap between adjacent ends of the shield in a sealed state, a kamaboko-shaped middle fold seal is attached to the outside of the machine at the seal attachment portion, and With a space as long as a lubricant holding space can be formed between the
Attach a solid bent seal with a height lower than that of the Kamaboko-shaped bent seal inside the machine at the shield mounting part,
A middle folding shield excavator, wherein a lubricant supply passage for supplying a lubricant to a lubricant holding space formed by the pair of middle folding seals is formed in a seal mounting portion. 2. The semi-folded seal of a semicircular shape having a flat bottom surface and a substantially circular upper surface, and a side portion of the substantially circular upper surface is chamfered. A folding shield machine.