JP3495450B2 - Tunnel excavator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tunnel excavator applied to curved construction of tunnel construction.

[0002]

2. Description of the Related Art A conventional tunnel excavator will be described with reference to FIGS. FIG. 5 is a cross-sectional plan view of the center folding jack mechanism,
FIG. 6A is a front view of the rolling prevention mechanism of the center folding portion,
FIG. 6B is a vertical cross-sectional side view taken along the line EE in FIG. 6A. Reference numeral 25 in FIG. 5 is a spherical ring that is the basis of the center folding jack mechanism, and the spherical surface of this spherical ring 25 has a radius R1 with the point C of the center line of the tunnel excavator as a base point. The spherical ring 25 is fixed to the rear body 14 and slidably contacts the inner surface of the front body 13 via a seal 15 .

18A and 18B are center folding jacks arranged at four positions on the left, right, top and bottom in the tunnel excavator. The rear end portions of these center folding jacks 18A and 18B are pivotally connected to the rear torso 14 via vertical pins 19. The front end portion is pivotally supported on the front body 13 via a vertical pin 20. Further, as shown in FIGS. 6 (a) and 6 (b), the rolling prevention mechanism of the center folding portion includes a spherical ring 25 fixed to the rear body 14, rolling stoppers 21, 22, 23, and a rolling stopper pin 24.
It is composed of and.

In the tunnel excavator shown in FIG. 5 and FIG. 6, the right upper and lower two center-folding jacks 18A are contracted during the right curve construction, and the left upper and lower two center-folding jacks 18 are contracted.
B is extended, the front body 13 is moved to the right with point C of the center line of the tunnel excavator as a base point, and a right curve is constructed. Also, when constructing the left curve, by the operation opposite to this,
The front body 13 is moved to the left with the point C on the center line of the tunnel excavator as a base point, and a left curve is constructed.

[0005]

The conventional tunnel excavator shown in FIGS. 5 and 6 has the following problems. (1) Since the front body 13 moves to the left or right with the point C of the center line of the tunnel excavator as a base point, the front body 13 has a spherical surface.
The sliding range with respect to the rear half of the ring 25 becomes large, so that the machine length becomes long and the workability is poor. The shorter the captain, the better the workability. (2) There is a problem in that machining of the rolling stoppers 21, 22, and 23 requires a lot of time, resulting in high cost.

The present invention has been proposed in view of the above problems, and the object of the present invention is to 1) shorten the captain,
The workability can be improved, 2) the amount of backfill material injected into the dug portion after excavation can be reduced, 3) the manufacturing cost can be reduced, 4) there is no fear of failure, and 5) the rolling prevention for the pseudo spherical ring will be possible. The point is to provide a tunnel excavator that can reduce the weight of the mechanism.

[0007]

To achieve the above object, a tunnel excavator according to the present invention has a front body having a cutter and a rear spherical surface ring slidably inserted in the front body. A body, a center folding jack that is connected to the front body and the rear body via vertical pin shafts, and a plate is attached to one body so that the front body and the rear body do not rotate relative to each other. At the same time, the other cylinder is provided with rolling prevention means for a pseudo spherical ring, in which two plates are attached with the one plate interposed therebetween (claim 1).

In the tunnel excavator, the plate of the rolling prevention means may be provided substantially horizontally (claim 2). In the tunnel excavator, the outer spherical surface of the pseudo spherical ring is composed of a front radius R having a large diameter and a rear radius r having a small diameter.
It may be formed by two spherical surfaces having different diameters, and the sum of the front radius R and the rear radius r may be substantially equal to the outer diameter of the pseudo spherical ring (claim 3).

[0009]

The tunnel excavator of the present invention is constructed as described above, and when a right curve is to be constructed, two upper and lower middle folding jigs are left.
While extending the jack 6B, the upper and lower right two center folding
With the jack 6A fixed, use the front body 13 as the base point
Move it to the right as and make a right curve. Also left
When performing a curve, the front body 13
Move to the left from the point A as a base point and construct a left curve
It Further, the rolling prevention means for the pseudo spherical ring is fixed substantially horizontally to the left and right inner wall surfaces of the upper and lower intermediate portions of the front body 13, and the left and right plates 16 are fixed to the left and right inner wall surfaces of the upper and lower intermediate portions of the rear body 14 respectively. By fixing the two plates 17 substantially horizontally, the plates 1
7. The plate 16 is sandwiched by 7 and the rolling prevention means for the pseudo spherical ring is composed of a front body 13 and a rear body 14.
Allows relative movement in the left and right directions relatively freely,
Suppress rotational movement.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a tunnel excavator of the present invention will be described with reference to an embodiment shown in FIGS. FIG. 1 is a vertical sectional side view showing the entire tunnel excavator, and FIG. 2 is a center folding jack mechanism.
FIG . 3 is a front view of the rolling stopper of the center folding portion, and FIG. 4 is a bottom view of the rolling stopper taken along the line DD in FIG.

1 is a tunnel excavator body, 2 is a cutter head rotatably provided on the front surface of the tunnel excavator body 1, 7 is a roller cutter provided on the cutter head 2, and 3 is the cutter head 2 Cutter drive motor 4 for rotating the screw conveyor is a screw conveyor. The cutter drive motor 3 rotates the cutter head 2 to rotate the roller cutter 7.
While excavating the earth and sand in the front by means such as the above, the excavated earth and sand is discharged from the machine from the screw conveyor 4.

Numeral 5 is a shield jack provided at the rear of the tunnel excavator main body 1, and numeral 9 is a segment. The segment 9 is carried in from the outside by the shield jack 5, and the segment 9 carried in from the outside is excavated by the erector 8 in the tunnel. It is designed to be assembled along the inner wall surface.
In FIGS. 2 and 3, 13 is the front body, 14 is the rear body, 6A is the upper right and lower two center folding jacks, 6B is the left upper and lower two center folding jacks, and 10 is the rear end portion of these center folding jacks 6A, 6B. A vertical pin shaft 11 pivotally supported on the rear torso 14 is a vertical pin shaft 11 pivotally supporting the front end portions of the center-folded jacks 6A and 6B to the front torso 13, and the upper and lower pin shafts 10 on the rear torso 14 side. , 10
Is the transverse plane of the tunnel excavator body 1 (XY axes).
Located on the surface) .

Reference numeral 12 denotes a pseudo spherical ring attached to the front portion of the rear body 14, and the outer front spherical surface of the pseudo spherical ring 12 is such that the center folding jacks 6A and 6B are on the XY axis planes.
If it is assumed , it becomes a spherical surface with a front radius R centered on the center point of the pin axis 10 of the virtual center folding jack 6B at a distance ,
The outer rear spherical surface of the pseudo spherical ring 12 is a virtual center near
The folding jack 6A has a spherical surface with a rear radius r centered on the center point of the pin shaft 10, and the sum of the front radius R and the rear radius r is substantially equal to the outer diameter of the pseudo spherical ring 12.

[0014] 15 is in sealing <br/> provided on the inner surface of the rear cylinder 13, the seal 15 is in contact with the outer spherical surface of the pseudo-spherical ring 12. 16 in FIGS. 3 and 4 are left and right one plate fixed substantially horizontally to the left and right inner wall surfaces of the upper and lower intermediate portions of the front body 13, and 17 is substantially horizontally fixed to the left and right inner wall surfaces of the upper and lower intermediate portions of the rear body 14. The plate 17 is sandwiched by the left and right plates, and the plate 17 sandwiches the plate 16 to form a rolling prevention mechanism for the pseudo spherical ring.

Next, the operation of the tunnel excavator shown in FIGS. 1 to 4 will be specifically described. Left side when constructing a right curve
While extending the upper and lower two center folding jacks 6B, the right side
With the two upper and lower center folding jacks 6A kept fixed, the front body 13 is moved to the right from the point B as a base point to construct a right curve. In addition, when performing a left curve , the reverse operation
Therefore, move the front body 13 to the left with point A as the base point,
Build a left curve.

In this way, when the right curve is installed, the front body 13
Is moved to the right from the point B as a base point to construct a right curve, and when the left curve is constructed, the front body 13 is moved to the left side from the point A as a reference point to construct a left curve. Compared to the case where the front body 13 is moved to the left or right with the point C as a base point, the rear spherical surface of the spherical ring of the front body 13
The sliding range with respect to is small, which reduces the machine length and improves workability.

Further, since the machine length is shortened, there is also an advantage that less dug during tunnel excavation is required and a small amount of backfill material is injected into the dug portion after excavation. In addition, a rolling prevention mechanism for the pseudo spherical ring is provided such that one left and right plate 16 is fixed substantially horizontally to the left and right inner wall surfaces of the upper and lower intermediate portions of the front body 13, and the left and right inner wall surfaces of the upper and lower intermediate portions of the rear body 14 are left and right. The two plates 17 are fixed substantially horizontally, and the plate 16 is sandwiched between these plates 17. The rolling prevention mechanism for the pseudo spherical ring is arranged in the left-right direction between the front body 13 and the rear body 14. Allows relative movement relative to, but suppresses rotational movement.

This pseudo spherical ring rolling prevention mechanism has a structure in which one plate 16 is simply sandwiched between two plates 17 as described above, and the structure is simple, so that the manufacturing cost is reduced. Further, since the structure is simple as described above, there is no need for a drive unit and there is no fear of failure. Further, since the structure is simple as described above, the weight of the rolling prevention mechanism for the pseudo spherical ring is reduced.

[0019]

As described above, the tunnel excavator according to the present invention moves the front body 13 to the right with the point B as a base point during the right curve construction to construct the right curve, and during the left curve construction, the front body 13 is constructed. Is moved to the left from the point A as a base point to construct a left curve, so that the front body 13 is moved to C as in the conventional case.
The sliding range of the front body 13 with respect to the rear spherical surface of the spherical ring can be reduced as compared with the case where the point is used as the base point and is moved to the left side or the right side. Therefore, the machine length can be shortened and the workability can be improved.

Further, since the machine length can be shortened, the amount of extra trench at the time of excavating the tunnel can be small, and the amount of backfill material injected into the extra trench after excavation can be reduced. The rolling prevention means for the pseudo spherical ring is fixed substantially horizontally to the left and right inner wall surfaces of the upper and lower intermediate portions of the front body 13, and the left and right plates 16 are fixed to the left and right inner wall surfaces of the rear body 14, respectively. The two plates 17 are fixed substantially horizontally, and the plate 16 is sandwiched between these plates 17. Since the structure is simple, the manufacturing cost can be reduced.

Since the structure is simple as described above, the weight of the rolling prevention means for the pseudo spherical ring can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an entire tunnel excavator of the present invention.

[Fig. 2] Crossing of the center folding jack mechanism of the tunnel excavator
It is a top view .

FIG. 3 is a front view showing a rolling stopper (plate) at a center folding portion of the tunnel excavator.

FIG. 4 is a transverse bottom view taken along the line DD of FIG.

FIG. 5 is a cross-sectional plan view showing a center folding jack mechanism of a conventional tunnel excavator.

FIG. 6 (a) is a front view showing rolling prevention means at a center-folded portion of the tunnel excavator, and FIG. 6 (b) is an arrow E-of FIG.
It is a vertical side view which follows the E line.

[Explanation of symbols]

6A Right-sided center-folded jack 6B Left-sided center-folded jack 10 Pin shaft 11 Pin shaft 12 Pseudo spherical ring 13 Front body 14 Rear body 15 Seal 16 Front body 13 side plate 17 of rolling prevention means Rear body of rolling prevention means 14 side plate R front radius of the pseudo spherical ring 12 r rear radius of the pseudo spherical ring A base point during left curve construction B base point during right curve construction

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) E21D 9/06

Claims (3)

(57) [Claims] 1. A front body having a cutter, a rear body having a pseudo spherical ring slidably inserted into the front body, and a front body and a rear body which are connected to each other through a vertical pin shaft. Pseudo-folding jack, one plate is attached to one cylinder so that the front body and the rear body do not rotate relative to each other, and two plates are attached to the other cylinder with the one plate sandwiched therebetween. A tunnel excavator characterized by comprising rolling prevention means for a spherical ring. 2. The tunnel excavator according to claim 1, wherein the plate of the rolling prevention means is provided substantially horizontally. 3. The outer spherical surface of the pseudo spherical ring is
Of the large front radius R and the small rear radius r
3. The tunnel excavator according to claim 1, wherein the tunnel excavator is formed by two different spherical surfaces, and the sum of the front radius R and the rear radius r is substantially equal to the outer diameter of the pseudo spherical ring.