JP3605887B2 - Middle folding parent-child shield machine - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a parent-child shield in which a small-diameter child shield starts from a large-diameter parent shield, and more particularly, to a center-folding parent-child shield excavator having a center folding mechanism in both the parent and child shields.
[0002]
[Prior art]
In recent years, as shown in FIG. 3, a parent-child shield 3 in which a small-diameter child shield 2 is stored inside a large-diameter parent shield 1 has been developed. The parent-child shield 3 separates the outer cutter 4 of the parent shield 1 from the inner cutter 5 of the child shield 2 and starts the child shield 2 from the parent shield 1, whereby the parent shield 1 and the child shield 2 are integrated. The small-diameter tunnel 7 constructed by the child shield 2 is continuously formed on the large-diameter tunnel 6 constructed in a state of being folded.
[0003]
FIG. 4 shows a center-folding parent-child shield excavator 9 provided with a center-folding mechanism 8 in both the parent and child shields 1 and 2. As shown in the figure, the excavator 9 includes a front trunk portion 1a of a parent shield 1 and a front trunk portion 2a and a rear trunk portion 2b of a child shield 2 housed therein. Further, the front trunk portion 1a and the rear trunk portion 1b are connected via a parent side middle bending jack 10, and the front trunk portion 2a and the rear trunk portion 2b are connected via a child side middle bending jack 11.
[0004]
When constructing a large-diameter tunnel 6 having a curvilinear shape with the child shield 2 housed in the parent shield 1, the center-folding parent-child shield excavator 9 uses the parent side middle folding jack 10 to in front of the parent shield 1. The trunk 1a and the rear trunk 1b are bent. At this time, since the child shield 2 is housed in the front trunk portion 1a of the parent shield 1, it is not bent. Further, when the child shield 2 is started from the parent shield 1 and the child shield 2 is used to construct a curved small-diameter tunnel 7, the child side middle bending jack 11 is used to connect the front trunk portion 2 a of the child shield 2 to the rear. The body 2b is bent.
[0005]
[Problems to be solved by the invention]
However, in the above-mentioned center-folding type parent-child shield excavator 9, since the parent shield 1 and the child shield 2 are provided with the central folding jacks 10, 11, the number of the central folding jacks 10, 11 becomes large. High cost. In addition, since the front body 1a of the parent shield 1 accommodates the front body 2a and the rear body 2b of the child shield 2 in the front body 1a, the front body 1a of the parent shield 1 has to be elongated in the axial direction. However, the length L of the entire excavator becomes long.
[0006]
In addition, the present inventors have devised that a rear work table 12 is provided on the rear trunk portion 2b of the child shield 2 as shown in FIG. It was not possible in reality. Because the rear working table 12 is integrated with the front trunk 1a of the parent shield 1 via the child shield 2, the rear trunk 1b of the parent shield 1 is bent with respect to the front trunk 1a. Is also in a straight line, and interferes with the trunk portion 1b after being bent. For this reason, the rear working table 12 includes one for the parent shield attached to the rear trunk 1b of the parent shield 1 and one for the child shield attached to the rear trunk 2b of the child shield 2 (both not shown). ), It was necessary to change them appropriately.
[0007]
In general, a shield machine is provided with an erector for assembling a segment on an inner peripheral surface of a borehole excavated by a cutter. The inventors of the present invention have considered providing the erector 13 on the rear trunk portion 2b of the child shield 2 and sharing it with the parent and child shields 1 and 2, but it was impossible. This is because, when the rear trunk portion 1b of the parent shield 1 is bent with respect to the front trunk portion 1a, the erector 13 is inclined with respect to the bent rear trunk portion 1b. For this reason, as for the erector 13, one for the parent shield attached to the rear trunk 1 b of the parent shield 1 and one for the child shield attached to the rear trunk 2 b of the child shield 2 (both not shown). Had to be replaced as appropriate.
[0008]
SUMMARY OF THE INVENTION It is an object of the present invention, which has been made in view of the above circumstances, to provide a center-folding parent-child shield excavator which shares equipment and shortens the length of the aircraft.
[0009]
[Means for Solving the Problems]
Means for Solving the Problems In order to achieve the above object, a center folding parent-child shield excavator according to the present invention is configured as follows.
[0010]
Storing torso after the child shield barrel after the parent shield stores the front section of the child shield front section of the parent shield, the center point of the bending of these parent and child shield and the same position, A middle bent jack is provided on one or both of the parent and child shields, and the front and rear trunks of the parent shield are connected via a spherical bearing, and the front and rear trunks of the child shield are connected to each other. Connected via spherical bearings, the radius of curvature of each spherical bearing is assumed to be a radius extending from the center point of the above-mentioned meandering, and a rear work table shared by the parent and child shields is provided at the rear trunk of the child shield. It is a thing.
[0014]
[Action]
According to the present invention, since the center point of the middle fold of the parent and child shields is at the same position, when the center fold jack provided on one or both of the parent and child shields is operated, the center point is Around the front body and the rear body of both shields, they bend synchronously.
[0015]
Here, the front torso of the child shield is stored in the front of the parent shield, and the rear of the child shield is stored in the rear of the parent shield. The length of the excavator can be shortened as compared with the conventional one that accommodates the front trunk and the rear trunk. In addition, if the above-mentioned middle bent jack is provided in one of the parent and the child shield, the middle bent jack can be shared by the parent and the child shield.
[0016]
In addition, since the radius of curvature of the spherical bearing of the shield of both the parent and the child is a radius extended from the common center point of the center bending, the front body and the rear body of the shield of the parent and the child are centered at the same center. When bending around a point, it bends smoothly without deteriorating the sealing performance.
[0017]
The rear working table provided on the rear trunk of the child shield is bent in synchronization with the rear trunk of the parent shield. Therefore, the rear working table does not interfere with the rear trunk portion of the parent shield, and can be shared by the parent and child shields.
[0019]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
[0020]
The outline of the parent-child shield 3 will be described with reference to FIG. As shown, a small-diameter child shield 2 is housed inside a large-diameter parent shield 1, and an outer cutter 4 for the parent shield 1 is detachably mounted on the outer periphery of an inner cutter 5 for the child shield 2. Attached to. The inner and outer cutters 4 and 5 are integrated when constructing the large-diameter tunnel 6, and are cut off when continuously forming the small-diameter tunnel 7.
[0021]
When a large-diameter tunnel 6 is formed in a state where the parent and child shields 1 and 2 are integrated, a load applied to the child shield 2 is reduced by a propulsion jack 14 (with a fixed stroke) provided inside the child shield 2. ) Is supported by a reaction force receiving bracket 15 provided inside the parent shield 1. Thereafter, when the child shield 2 is started from the parent shield 1, the propulsion jack 14 may be extended. After the child shield 2 is started, the hood 16 fitted on the shield frame of the child shield 2 is moved forward to form a cutter chamber 17 of the child shield 2.
[0022]
Next, the center-folding parent-child shield excavator 18 will be described with reference to FIGS. As shown in the figure, the front trunk 2a of the child shield 2 is stored in the front trunk 1a of the parent shield 1, and the rear trunk 2b of the child shield 2 is stored in the rear trunk 1b of the parent shield 1. The center point C of the parent and child shields 1 and 2 is located at the same position. Specifically, front trunk support members 19 and 20 for concentrically supporting the child shield front trunk 2a are provided on the inner peripheral surface of the parent shield front trunk 1a, and are provided on the inner peripheral surface of the parent shield rear trunk 1b. A rear trunk support member 21 for supporting the child shield rear trunk 2b concentrically is provided.
[0023]
The first front trunk supporting member 19 is provided with a ring-shaped partition wall 22 extending radially inward from the inner peripheral surface of the parent shield front trunk portion 1a, and extends axially rearward from the tip of the partition wall 22. And a cylindrical sliding contact portion 23 formed. The inner diameter of the sliding contact portion 23 is slightly larger than the outer shape of the front trunk portion 2a of the child shield. The ring-shaped partition wall 22 separates the face side from the inside of the pit, and is flush with a disk-shaped partition wall 24 provided on the front body part 1a of the child shield. That is, the ring-shaped partition wall 22 and the disk-shaped partition wall 24 define a cutter chamber in front of them.
[0024]
The second front trunk support member 20 includes a bracket 25 extending radially inward from the inner peripheral surface of the parent shield front trunk 1a, and a sliding contact portion extending axially rearward from the tip of the bracket 25. 26. The sliding contact portion 26 is configured such that the child shield front body portion 2a is in sliding contact. A plurality of the second front trunk support members 20 are provided at predetermined intervals along the circumferential direction of the parent shield 1. The bracket 25 may have a ring shape, the sliding contact portion 26 may have a cylindrical shape, and the second front trunk support member 20 may have the same configuration as the first front trunk support member 19.
[0025]
According to this configuration, the child shield front body 2a is coaxially and slidably supported by the parent shield front body 1a via the front body support members 19 and 20. The front body support members 19, 20 are not limited to the first and second front body support members 19, 20 as described above, and a large number of third, fourth,... Of course, it may be possible.
[0026]
On the other hand, the rear trunk support member 21 includes a ring-shaped bracket 27 extending radially inward from the front end of the parent shield rear trunk portion 1b, and a cylindrical bracket extending axially rearward from the distal end of the bracket 27. Slidable contact portion 28. The inner diameter of the sliding contact portion 28 is slightly larger than the outer shape of the child shield rear trunk portion 2b. In the figure, the reason why the length of the rear shield portion 2b is short is to secure a working space (eg, assembling of segments) behind it. A tail portion (not shown) is added to the rear end of the short rear trunk portion 2b when the child shield 2 starts moving.
[0027]
According to this configuration, the child shield rear trunk portion 2b is supported concentrically and slidably on the parent shield rear trunk portion 1b via the rear trunk support member 21. In addition, it is desirable that the length of the rear body portion 2b and the length of the sliding contact portion 28 be long as long as the rear working space is not pressed. This is because, when the length is longer, when the child shield rear trunk portion 2b is bent, the parent shield rear trunk portion 1b easily follows and bends.
[0028]
The front trunk portion 1a and the rear trunk portion 1b of the parent shield 1 are connected via a parent-side middle bendable seal 29, and the front trunk portion 2a and the rear trunk portion 2b of the child shield 2 are separated from the child side. They are connected via a folding seal 30. Each of the middle folding seals 29 and 30 extends in the axial direction from the front end of the rear trunk portion 1b or 2b, and extends radially inward from the rear end of the front trunk portion 1a or 2a. It is composed of seal portions 33 and 34 which come out and come into contact with the cylindrical portions 31 and 32. Here, the rear ends of the front trunks 1a and 2a are flush with each other, and the front ends of the rear trunks 1b and 2b are flush with each other. C is at the same position.
[0029]
The front trunk portion 2a and the rear trunk portion 2b of the child shield 2 are connected via a center bending jack 35. One end of the center bending jack 35 is fixed to a bracket 36 provided on the inner peripheral surface of the front body 2a, and the other end is fixed to a bracket 37 provided on the inner peripheral surface of the rear body 2b. A plurality of the middle bending jacks 35 are provided at predetermined intervals in the circumferential direction. According to this configuration, when the center bending jack 35 is appropriately expanded and contracted to bend the front trunk portion 2a and the rear trunk portion 2b of the child shield 2, the bending is caused by the front trunk support members 19 and 20 and the rear trunk support, respectively. The light is transmitted to the front body 1a and the rear body 1b of the parent shield 1 via the member 21 so that the front body 1a, 2a and the rear body 1b, 2b of the parent and child shields 1, 2 are common. It bends integrally about the bending center point C.
[0030]
A rear working table 38 shared by the parent and child shields 1 and 2 is provided on the rear body 2b of the child shield. The rear working table 38 includes an inner portion 38a and an outer portion 38b fitted on the inner portion 38a. This rear work table 38 is used in a state where the parent and child shields 1 and 2 shown in FIG. 3 (a) are integrated and the outer part 38b is fitted to the inner part 38a, as shown in FIG. 3 (b). The child shield 2 that has been started is used with the outer peripheral portion 38b removed and the inner peripheral portion 38a alone. Thereby, the working space in the rear working table 38 is adjusted to each shield diameter of the parent or child shields 1 and 2.
[0031]
In the rear body 2b of the child shield, there is provided an erector 39 for assembling segments on the inner peripheral surface of the borehole excavated by the cutter. The erector 39 includes a swivel ring 41 supported by a rotating roller 40, an arm 42 mounted on the swivel ring 41, an elevating frame 43 mounted on the arm 42 so as to be movable up and down, and a segment mounted on the elevating frame 43. And a gripping portion 44 for gripping. The erector 39 lifts the segment gripped by the gripping portion 44 radially inward by the lifting frame 43, rotates the swivel ring 41 to move it to a desired assembly position, and moves the lifting frame 43 radially outward. Then, it is fitted into a desired assembling position.
[0032]
The operation of the present embodiment having the above configuration will be described.
[0033]
According to the center-folding type parent-child shield excavator 18 shown in FIG. 1, when the center bending jack 35 provided on the child shield 2 is operated, the center folding center point C of the parent and child shields 1 and 2 is centered. The front trunk portions 1a, 2a and the rear trunk portions 1b, 2b of both shields 1, 2 are bent integrally in synchronization. In other words, the above-described bent jack 35 can be shared by the parent and child shields 1 and 2. Therefore, the number of the middle bent jacks 35 can be reduced to approximately half as compared with the conventional one shown in FIG. 4 in which both the parent and child shields 1 and 2 are provided with the middle bent jacks.
[0034]
Further, since the child shield front body 2a is stored in the parent shield front body 1a and the child shield rear body 2b is stored in the parent shield rear body 1b, the child shield 2 is stored in the parent shield front body 1a. The length L of the excavator 18 can be reduced as compared with the conventional one shown in FIG. 4 in which the front trunk portion 2a and the rear trunk portion 2b are accommodated. Therefore, it is advantageous in the construction of a sharp curve.
[0035]
Further, the rear working table 38 provided on the rear body 2b of the child shield is bent integrally in synchronization with the rear body 1b of the parent shield. Therefore, the rear work table 38 does not interfere with the rear body part 1b of the parent shield unlike the conventional one shown in FIG. 4, and can be shared by the parent and child shields 1, 2.
[0036]
In addition, the erector 39 provided on the rear body portion 2b of the child shield is bent integrally with the rear body portion 1b of the parent shield in synchronization with the same reason as described above. Therefore, the erector 39 is not inclined with respect to the rear body 1b of the parent shield unlike the conventional one shown in FIG. 4, and can be shared by the parent and child shields 1, 2.
[0037]
FIG. 2 shows a modified example of the center folding seal.
[0038]
As shown in the figure, the middle bend seal 45 is constituted by spherical bearings 46 and 47 on both the parent and child shields 1 and 2 side. The spherical bearings 46 and 47 are composed of concave spherical portions 46a and 47a formed on the front body portions 1a and 2a, and convex spherical portions 46b and 47b formed on the rear body portions 1b and 2b, respectively. , the convex spherical portion 46b, 47b radius of curvature has a radius _R 1, _{R 2} which extend respectively from the center point C break in the. That is, the convex spherical portion 46b on the parent shield 1 side has a gentler curve than the convex spherical portion 47b on the child shield 2 side.
[0039]
According to this configuration, when the front torso portions 1a, 2a and the rear torso portions 1b, 2b of the parent and child shields 1, 2 bend integrally, they bend about a common center-fold center point C. Therefore, the contact pressure (interval) between the convex spherical portions 46b, 47b of the spherical bearings 46, 47 and the concave spherical portions 46a, 46a does not change. Can be maintained. In addition, since the resistance is reduced, highly accurate and smooth angle control can be performed.
[0040]
【The invention's effect】
As described above, according to the present invention, the following excellent effects are exhibited.
[0041]
(1) can shorten the captain of the entire excavator, also can share the bending jack in which is provided on one of the parent or child shield to the parent and child shield.
[0042]
(2) It can be bent smoothly without deteriorating the sealing performance.
[0043]
(3) The rear work table can be shared by the parent and child shields.
[Brief description of the drawings]
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view of a center-folding type parent-child shield excavator showing one embodiment of the present invention, wherein (a) shows a straight traveling state and (b) shows a bending state.
FIG. 2 is a view showing a modified example of the center folding seal of the center folding type parent-child shield excavator.
3A and 3B are diagrams showing an outline of a parent-child shield, wherein FIG. 3A shows a state when a large-diameter tunnel is excavated, and FIG.
FIGS. 4A and 4B are explanatory diagrams of a center-folding parent-child shield excavator showing a conventional example, wherein FIG. 4A is a diagram showing a straight traveling state, and FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Parent shield 1a Front trunk part 1b Rear trunk part 2 Child shield 2a Front trunk part 2b Rear trunk part 35 Center bending jack 38 Rear working table 39 Elector 46 Spherical bearing 47 Spherical bearing C Center point R of center bending R ₁ radius of curvature R ₂ curvature radius

Claims (1)

The front torso of the child shield is stored in the front torso of the parent shield, and the rear torso of the child shield is stored in the rear torso of the parent shield. A middle bent jack is provided on one or both of the parent and child shields, and the front and rear trunks of the parent shield are connected via a spherical bearing, and the front and rear trunks of the child shield are connected to each other. Connected via spherical bearings, the radius of curvature of each spherical bearing is assumed to be a radius extending from the center point of the above-mentioned meandering, and a rear work table shared by the parent and child shields is provided at the rear trunk of the child shield. A folding parent-child shield excavator characterized by the following.

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