JP2744220B2 - Folding structure of shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The invention according to this application relates to a shield excavator having a bent part between a front trunk and a rear trunk (in the invention according to this application, a shield excavator for excavating a soft layer,
Includes all tunnel excavators for excavating hard rock formations and tunnel excavators for excavating complex formations. ), And relates to a center folding structure of a shield machine which bends and protrudes the center folding part during curved propulsion.

[0002]

2. Description of the Related Art Conventionally, shield excavators have been developed which continuously excavate by propelling a curve from a starting shaft to an reaching shaft so as to avoid underground structures and the like. This shield machine has a front body provided with a cutter disk on the front side and a rear body provided with an erector device for assembling a segment. The center folding jack is bent at a predetermined angle by controlling the expansion and contraction of the center folding jack, thereby propelling a curve.

As shown in the plan view of FIG. 4 (a), a shield excavator capable of curving such a curve is provided with a pin 54 at a bending center of a bent portion 53 between a front trunk 51 and a rear trunk 52. As shown in the plan view of FIG.
A configuration in which the periphery of the center folded portion 53 between the front trunk 51 and the rear trunk 52 is connected by a spherical seat 55 is employed.

As shown in the plan view of FIG. 4 (c), in the case of the center folding section of the rectangular shield machine, a rectangular center folding section 58a on the front trunk 56 side and a rectangular center folding section on the rear trunk 57 side. The half-folded portion 58 is formed by overlapping the portion 58b like a double tube so as to overlap with each other, and the middle-folded portion 58 is in a state in which flat plates are overlapped. It can slide along the other rectangular center folding part.

[0005] Japanese Patent Application Laid-Open No. Sho 61-98 discloses a prior art in which a pin is provided at the center folding portion and a spherical seat is provided around the center folding portion.
No. 899 discloses the invention.

[0006]

However, in the case of the structure provided with the above-mentioned middle bent portion 53 and the spherical seat 55, the middle bent portion 53 and the spherical seat 55 are so provided that they can always withstand external soil water pressure or the like and stop water. Due to the so-called rigid structure in which the positional relationship at the position is always constant, if an imbalance occurs in the load of the center folding jack during curve propulsion, these pins 54
And acts on the spherical seat 55 as a thrust force.

For this reason, it is necessary to design in consideration of the fact that the pins 54 and the spherical seats 55 bear the load in the thrust direction generated during curve propulsion, instead of the center folding jack.
For example, in order to withstand several thousand tons acting as instantaneous thrust, the structure of the pin 54 and the spherical seat 55 must be made more robust than necessary in consideration of safety, resulting in an excessively large structure. It takes a lot of time and money to make the part.

[0008] In the case of the rectangular folding machine 58 formed of a flat plate as described above, the angle at which the flat plates of the rectangular bending plates 58a and 58b having the double pipe structure can be bent is limited. , Can not do enough curve propulsion.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the invention according to the present invention relates to a method in which a front folding part connected to a front trunk and a rear trunk by a center folding jack is joined by flexible joining means. Thereby, it is possible to follow the curve propulsion and to make a large bend, so that the structure is a simple folding structure.

In this manner, by connecting the middle fold portion between the front body and the rear body by the flexible joining means, the force acting on the middle fold portion during curve propulsion can be absorbed by bending the flexible joining means. In addition, it is possible to form a simple folding structure that can easily absorb displacement during curve propulsion.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to the present invention is characterized in that the front body and the rear body of a center folding part which is provided with a plurality of center folding jacks and which can be bent are connected by flexible joining means. The flexible joining means is configured to be bendable following the bending by the jack. In this way, by connecting the front body and the rear body with a flexible soft joining means, if the curve propulsion is controlled by the center folding jack during curve propulsion, the center bend follows the middle bend, so that the middle bend Can be set low. As the flexible joining means, any means can be used as long as it can be easily bent to prevent intrusion of mud or the like from between the front body and the rear body.

As the flexible joining means, a flexible structure plate is provided so as to protrude from one of the front body and the rear body toward the other, and the flexible structure plate is connected to the other front body or the rear body. In this case, a flexible joining means between the front body and the rear body can be formed with a simple configuration.

Further, if the connection between the flexible structure plate and the other front body or the rear body is performed by a water-tight sealing means, a connecting portion between the front body and the rear body can be provided without providing another sealing means. Thus, reliable sealing can be performed.

Further, if a spacer is provided to keep the distance between the sealing means within a predetermined range with respect to the displacement caused by the half angle between the front trunk and the rear trunk, the curved propulsion can be performed without pressing the sealing part at the time of bending. can do.

Further, if the support points at both ends of the center folding jack are provided at a predetermined angle with respect to the axis of the shield machine, the center folding jacks are prevented from displacing each other in the circumferential direction. By adjusting the expansion and contraction of the folding jack, it is possible to easily prevent the axial center deviation between the front trunk and the rear trunk.

Further, if a backup member is provided on the inner peripheral side of the flexible structure plate to support the flexible structure plate when it is bent by external pressure, the backup member can easily operate even if a large external pressure acts on the flexible structure plate. Can be supported.

In addition, the backup member is provided with a support member protruding from the front trunk side to the inner peripheral side of the flexible structure plate, and to the inner peripheral side of the flexible structure plate from the rear trunk side so as not to interfere with the support member. If it is configured with the protruding support member, it can be reliably supported with a simple configuration.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the invention according to the present application will be described below with reference to the drawings. FIG. 1 is a side sectional view showing a center folding structure of a shield machine according to the invention of the present application, and FIG. 2 is an enlarged view as viewed from an arrow A shown in FIG.

As shown in the figure, a center folding jack 3 is provided between a girder portion 1a provided at a rear portion of the front body 1 and a girder portion 2a provided at a front portion of the rear body 2. A portion between the rear portion of the front body 1 and the front portion of the rear body 2 which is a rigid body by expanding and contracting the center folding jack 3 is configured to be bendable.

The center folding jack 3 has a diameter 4a of the front support point 4 on the front trunk 1 side and a diameter 5a of the rear support point 5 on the rear trunk 2 side.
a is provided so as to increase, and the radial arrangement is such that the diameter increases from the front trunk 1 side to the rear trunk 2 side with respect to the axis t of the shield machine s. In this example,
By arranging the center folding jack 3 at a predetermined angle with respect to the axis t in this manner, a radial displacement between the front trunk 1 and the rear trunk 2 is prevented. As another method for preventing the displacement between the front body 1 and the rear body 2 in the radial direction, a configuration may be adopted in which a support material or the like is provided from one side to prevent the displacement.

At the front end of the rear body 2, a flexible structure plate 6 extending toward the front body 1 is provided, and at the front end of the flexible structure plate 6, a cylindrical ring member 7 is provided. The flexible structure plate and the ring member 7 are provided all around. A predetermined gap 8 is formed between the ring member 7 and the front body 1, and a sealing material 9 for sealing the entire circumference between the ring member 7 and the inner wall of the front body 1 is provided in the gap 8. Have been. These form a flexible joining means.

The flexible structure plate 6 is preferably made of a metal that can be easily deformed when the center folded portion u is bent, and a steel plate having a predetermined thickness is most easily processed and the cost can be reduced. The thickness of the flexible structure plate 6 and the length in the direction of the axis t may be set in accordance with the size of the shield machine s, the angle of the center bending, and the like.

A spacer 10 is provided around the ring member 7, and the spacer 10
Even if the ring member 7 connected to the front end of the flexible structure plate 6 is lowered by its own weight or is pressed in a certain direction by external pressure, the sealing member 9 is not pressed more than necessary. If the gap 8 between the ring member 7 and the inner wall of the front body 1 is set within the predetermined range by the spacer 10, the sealing means can exhibit the sealing effect for a long time. The spacer 10 may be provided on the entire circumference of the ring member 7 or a plurality of the spacers may be provided at predetermined intervals.

Further, in this embodiment, a support member 11 serving as a backup member b is provided so that even when the flexible structure plate 6 is bent by earth pressure or the like, the flexible structure plate 6 is not bent more than the elastic limit. I have. The support member 11 includes a front body-side support member 11a extending rearward from the ring member 7 side and a rear body 2
And a rear trunk-side support member 11b extending forward from the front end of the main body, and are provided so as to be shifted in the circumferential direction so that they do not interfere with each other. By providing the comb-shaped support member 11 between the ring member 7 and the front end of the rear body 2 in this manner, even if the flexible structure plate 6 is bent, the flexible structure plate 6 is supported by the support member 11 within a predetermined bending amount. ing. The backup member b may be any structure that can support the flexible structure plate 6 when the flexible structure plate 6 is bent, and any member that can support the flexible structure plate 6 between the front end of the rear trunk 2 and the ring member 7. Good.

According to the middle folding structure v of the shield machine as configured above, as shown in the sectional view in plan view of FIG. be able to.

That is, when the half-folded portion u between the front trunk 1 and the rear trunk 2 is bent to a predetermined half-angle α by the middle-folding jack 3 during curve propulsion, the flexible structure plate 6 of the half-folded portion u is bent. It flexes flexibly to follow the half angle. Therefore, if the angle between the front trunk 1 and the rear trunk 2 is determined by the expansion and contraction of the plurality of center folding jacks 3, the center folding part u flexes flexibly and follows the arbitrary center folding angle α. At this time, even if an imbalance occurs in the load of the center folding jack 3, it can be absorbed by deformation of the flexible structure plate 6.

Therefore, if the length of the flexible structure plate 6 in the axial direction and the gap 8 between the front body 1 and the flexible structure plate 6 are set to optimal values,
Curved propulsion in which the center folding part u is bent at a large center bending angle α can be easily realized. In addition, since the center folded portion u can be formed in a simple structure without having a strong structure as in the related art, the manufacturing cost can be greatly reduced.

In this embodiment, a support member 11a projecting from the ring member 7 toward the rear trunk 2 is provided.
Since the support member 11 is formed by the support member 11b protruding from the rear trunk 2 side to the front trunk 1 side so as not to interfere with the flexible structure plate 6 in the circumferential direction when the flexible structure plate 6 is bent by external pressure. The support members 11a and 11b can surely support the support members. In this case, the flexible structure plate 6 is deformed within the elastic limit.

In the above embodiment, the flexible body plate 6 is provided so as to project from the rear body 2 side to the front body 1 side.
Of the front body 1 has a flexible structure, and the rear end of the other front body 1 is connected as a rigid structure. Conversely, a flexible structure plate extends from the front body 1 side to the rear body 2 side. 6 may be provided so as to protrude, and the selection of whether to provide the flexible structure plate 6 on the front body 1 or the rear body 2 may be appropriately determined according to the diameter of the shield machine s, the curve propulsion conditions, and the like. good.

[0030]

The invention according to this application is implemented in the form described above, and has the following effects.

The flexible joining means for connecting the front and rear trunks flexibly deforms following the displacement caused by the mid-folding during curve propulsion, so that all the thrust force at the time of excavation acts on the half-fold jack. It is possible to perform excavation, thereby simplifying the structure of the center fold and reducing costs.

Further, if the flexible joint between the front body and the rear body is formed by a flexible structure plate, it is possible to configure a half-fold structure that bends according to the half-fold angle with a simple structure.

Further, if the connection between the flexible structure plate and the front body or the rear body is made by a sealing means, a water-tight structure can be easily obtained. Further, a spacer for keeping the interval between the sealing means within a predetermined range is provided. If it is provided, it is possible to exhibit the sealing effect for a long time without impairing the effect of the sealing means at an early stage.

In addition, if the center folding jacks are provided so that the support points at both ends are at a predetermined angle, the center body of the front trunk and the rear trunk can be propelled even when there is a change in geology or the like. Can be easily performed.

In particular, since the center bending angle can be made large even in a structure in which the center bending portions are connected by a flat plate or the like, the center bending angle can be reduced even in a shield excavator having a different diameter section such as a rectangular shield excavator. It is possible to easily take a large curve and drive a curve.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a center folding structure of a shield machine according to the present invention.

FIG. 2 is a view taken in the direction of the arrow A shown in FIG.

FIG. 3 is a sectional view in plan view showing a curved propulsion state of the shield machine shown in FIG. 1;

FIGS. 4A and 4B are diagrams showing a center folded portion of a conventional front trunk and a rear trunk, wherein FIG. 4A is a schematic diagram showing a center folding pin, FIG. 4B is a schematic diagram showing a spherical seat, and FIG. It is a schematic diagram which shows the center folding part of a shield machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Front trunk 1a ... Strength member 2 ... Rear trunk 2a ... Strength member 3 ... Center folding jack 4 ... Front support point 4a ... Diameter of front support point 5 ... Rear support point 5a ... Diameter of rear support point 6 ... Soft Structural plate 7 ... Ring member 8 ... Gap 9 ... Seal material 10 ... Spacer 11 ... Support material 11a ... Front trunk side support material 11b ... Rear trunk side support material b ... Backup member s ... Shield excavator t ... Shaft center u ... Medium Folded part v… Fold structure α… Fold angle

Claims (7)

(57) [Claims] 1. A middle folding structure of a shield machine in which a plurality of middle folding jacks are provided between a front trunk and a rear trunk so as to be bendable. Connect with the body by flexible joining means,
A middle folding structure of a shield excavator, wherein the flexible joining means is configured to be able to bend following the bending of the middle folding portion by the middle folding jack. 2. A flexible joining means comprising a flexible structure plate projecting from one of the front body and the rear body toward the other, and connecting the flexible structure plate and the other front body or the rear body. The center folding structure of the shield machine according to claim 1, wherein: 3. The shield machine according to claim 1, wherein the connection between the flexible structure plate and the other front or rear body is performed by a water-tight sealing means. Folded structure. 4. A shield machine according to claim 3, further comprising a spacer for keeping a distance between the sealing means within a predetermined range with respect to a displacement caused by a half angle between the front body and the rear body. Folded structure. 5. The shield according to claim 1, wherein support points at both ends of the center folding jack are provided at a predetermined angle with respect to the axis of the shield machine. Folding structure of excavator. 6. The flexible structure plate according to claim 1, wherein a backup member is provided on an inner peripheral side of the flexible structure plate to support the flexible structure plate when the flexible structure plate is bent by an external pressure. Folded structure of shield machine. 7. A support member protruding from the front trunk side to the inner peripheral side of the flexible structure plate, and the back-up member according to claim 6, wherein the backup member is formed from the rear trunk side so as not to interfere with the support member. A center folding structure of a shield machine, comprising a support member protruding from a peripheral side.