JP2867796B2 - Underground excavator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground excavator suitable for excavating a horizontal shaft for constructing a subway, a road tunnel, a water supply and sewage system, and the like. The present invention relates to an underground excavator equipped with an excavation tool.

[0002]

2. Description of the Related Art An underground excavator equipped with this kind of excavator is
It has already been proposed by the applicant. 14 and 15
Is an example of the underground excavator.

That is, the excavator 2 of the underground excavator 20
1 has vertical and horizontal frame-shaped cutter spokes 21a to 21d having a substantially rectangular outer shape, and a large number of cutting blades 23 are provided on the front side thereof. , The front ends of a plurality of support shafts 24 are pivotally mounted, and the rear ends of the support shafts 24 are connected to positions eccentric to the center of the rotating body 25, and the rotating body 25 is rotated by a drive motor 27 behind the partition 26. When moving, since each support shaft 24 is eccentric with respect to the rotation center as described above, the excavator 21 is configured to rotate like a parallel link and excavate a necessary cross section.

However, the underground excavator cannot bend unless a necessary portion is excavated at the time of constructing a curve or correcting the direction. Therefore, as shown in FIG. The jacks 28 and 29 are installed at right angles to each other, and by selecting and driving the jacks 28 and 29, the vertical and horizontal cutter spokes 21a to 21d are appropriately slid left and right, up and down, etc., to carry out overdigging. .

[0005]

However, if the plurality of jacks 28 and 29 are respectively assembled around the support shafts 24 in this manner, the cross section of the excavating tool 21 becomes unnecessarily large. There is a problem that the excavation resistance increases, which leads to an increase in cutter torque. Also, when the extended jacks 28 and 29 are pulled, the earth shavings may be pinched between the jack support member 30 and the cutter spokes, and some extra excavation is performed, so that the excavation in a predetermined direction is performed. There were also problems such as hindrance and a possibility that the excavated cross-sectional shape might be different from the initial shape.

[0006] The present invention has been proposed in view of the above points, and an object of the present invention is to provide an underground excavator having an excavating tool that rotates in a parallel link so that the cross section of the excavating tool is made larger than necessary. It is an object of the present invention to provide an underground excavator capable of excavating without performing excavation.

[0007]

According to the present invention, a plurality of rotations are provided.
A support shaft is provided at an eccentric position of the body, and these support shafts are provided.
In an underground excavator equipped with an excavating tool that rotates in a parallel link through the back, the excavating tool is provided in front, and a rear portion of a partition wall slidably supported in the shield tube in a left-right or up-down direction. One end of each of a plurality of jacks for up and down sliding is connected via a support member, and the other ends of these jacks are slidably connected to a support provided at the rear of the bulkhead. One end of each of a plurality of jacks for sliding in the left-right direction is connected to the left and right sides of the rear part via a support member, and the other ends of these jacks are slidably connected to a support part provided at the rear part of the partition wall. Thereby, the partition wall, and furthermore, the excavating tool provided in front of the partition wall can be slid in a predetermined direction, thereby achieving the above object.

[0008]

According to the present invention, as described above, a plurality of jacks for excavation are not provided on the excavating tool side, but are provided behind the partition wall. For this reason, the shape of the excavator does not become larger than necessary.

[0009]

1 to 4 show a first embodiment of the present invention, and show a case where the present invention is applied to a mud pressure shield having an excavated cross section of a slightly elongated, substantially rectangular shape. FIG. 1 is a longitudinal sectional view showing an internal configuration when the underground excavator is viewed from the side.
In the figure, reference numeral 1 denotes an underground excavator according to the present invention, and 2 denotes a shield tube made of a substantially rectangular cylindrical steel plate constituting the underground excavator 1. A slidable partition wall 3 is provided in a front portion of the shield tube. It is divided into the face room 4 side and the inside of the back pit.

Reference numeral 5 denotes a rotating body rotatably provided on the front surface of the partition wall 3. In this example, as shown in FIG. 1 and FIG.
And four on the left side as well. A front end of a shaft 6 is connected to a substantially central portion of a rear surface of each rotating body 5. The shaft 6 is rotatably supported by a partition 3 via a bearing 6 ′ and penetrates rearward. . As shown in FIGS. 1 and 4, the rear end of the shaft 6 connected to each rotating body 5 is connected to a driving motor 7 provided at the rear part of the partition wall. The body 5 is configured to rotate. In this case, it is not necessary to provide the drive motors 7 on all the shafts 6.

1 and 3 are provided on the front surface of each rotating body 5.
As shown in the figure, the rear ends of the support shafts 8 are connected to positions eccentric to the center thereof, respectively, and the front ends of the support shafts 8 are connected to the rear surfaces of the cutter spokes constituting the excavator 9. This cutter spoke, as shown in FIG.
As a whole, it is substantially shaped like an eye, and in this example, is constituted by first to fourth cutter spokes 9a to 9d.

That is, in FIG. 2, the first cutter spoke 9a located at the upper left as viewed from the front has an F-shape of the alphabet, and the second cutter spoke 9b on the right thereof has an inverted F of the target shape. It is shaped like a letter. In addition, the third cutout below the first cut-spoke 9a
Has a inverted F-shape, and a fourth cutter spoke 9d on the right side thereof has an inverted F-shape to face it, and each of the first to fourth cutter spokes 9a to 9d is opposed to each other. As shown in FIGS. 1 and 2, the ends are connected by an extendable slide unit 10. That is, the slide portion 10 has a connecting rod 10a that is slightly thinner than the cutter spokes 9a to 9d, and both ends thereof are slidably loosely fitted into elongated holes formed at respective ends of the cutter spokes 9a to 9d. As a result, the divided portion of the digging tool 9 can expand and contract in the left and right and up and down directions, that is, can slide. As shown in FIGS. 1 and 2, when the cutter is not slid, that is, at the time of normal excavation that does not require extra excavation, each cutter spoke 9
A gap g is provided in advance between the ends of the inner sliding portions 10 opposing each other at a to 9d. This is to prevent as much as possible the harm caused by pinching of the earth between the spokes when the spokes are pulled in at the end of the excavation.

The partition wall 3 is provided behind the excavating tool 9 as described above. The partition wall 3 has a cross shape vertically and horizontally at the center as shown in FIGS. Are provided, the slits S having a predetermined width are provided, correspond to the cutter spokes 9a to 9d having the first to fourth four divided structures, have the first to fourth divided structures, and are slidable by means to be described later. It Does, consists of four partition walls 3 a to 3 d, and the space S ₁ is formed between the outer and the inner peripheral surface of the shield tube 2 of the partition walls 3.

Further, on the outer periphery behind the partition wall 3 and behind the cross-shaped slit S, as shown in FIGS.
A reinforcing member 11 is provided. This reinforcing member 11 is for preventing the excavated earth and sand from entering the inside of the pit, and for preventing the shield cylinder 2 and the partition wall 3 from being deformed by external pressure such as soil water pressure, and substantially along the contour of the shield cylinder 2. It is composed of a rectangular outer frame 11 a, a vertical member 11 b and a horizontal member 11 c which cross the inside thereof in a cross shape, and the outer frame 11 a is fixed to the inner peripheral surface of the shield tube 2. The partition 3 is slidably in contact with the front surface of the reinforcing member 11.

In FIGS. 1 and 4, 12a to 12a
12l is an appropriate number of jacks for sliding the divided part of the bulkhead 3 in the direction of the excavation cross section, that is, in the direction perpendicular to the excavation direction. These jacks are provided behind the bulkhead 3 and are provided in the vertical direction. Jacks 12e to 12h and jacks 12i to 12l for the left and right direction, and right and left side extra jacks 12a, 1 provided in the left and right direction.
2b and jacks 12c and 12d.
The number of jacks is not limited to the illustrated example.

A jack 1 provided in the vertical direction
The other end of each of 2e to 12l is slidably supported in any direction as shown by a thick white arrow with respect to a cross member 11c as a reinforcing member 11 provided in the shield cylinder 2, and one end of each Support member 1 attached to partition walls 3a to 3d
2 and the partition walls 3a to 3a
3d. The other end of each of the jacks 12a to 12d provided at an interval in the left and right direction is similarly supported by a vertical member 11b as a reinforcing member 11, and one end is similarly attached to each of the partition walls 3a to 3d. Supported by the supporting member 12. Thus, each partition wall 3a~3d consisting split structure, with there is a slit S therebetween, because there is a space _{S 1} to the outer periphery, each jack 12a~
By appropriately selecting and expanding 12l, it is possible to slide in the expanding and contracting direction.

Further, shafts 6 are respectively supported on the partition walls 3a to 3d slidable in this manner.
Further, a rotating body 5 and the like are provided thereon,
The excavating tool 9 is provided through the
Each of the cutter spokes 9a to 9b has a connecting structure that can be extended and contracted by a slide portion 10 so that a divided portion of the excavator 9 can slide in an arbitrary direction. Following the slides 3a to 3b, the corresponding cutter spokes 9a to 9b
9b also slides in the direction of the excavation cross section requiring extra excavation. In other words, in the present invention, a plurality of jacks 12a to 12l are provided in the space behind the bulkhead 3 so as to slide the bulkheads 3a to 3b and thus the drilling rig 9 for excavation. The jack itself is not provided, so that its shape and weight do not increase.

In addition, reference numeral 13 in the drawing denotes an earth discharging device such as a screw conveyor having a front end connected to a lower central portion of the partition wall 3 for discharging the excavated earth and sand in the face chamber 4 to the inside of the pit. It is. In this case, as shown in FIGS. 2 and 3, the third and fourth partition portions 3
c, and the slit S ₂ is provided so as to 3d can slide. In FIG. 1, reference numeral 14 denotes a jack for excavating the underground excavator 1 provided inside the shield tube 2 and between the reinforcing member 11 and a reaction force receiver (not shown).

Next, the operation of this embodiment will be described.
First, when excavating the ground, when the drive motor 7 is driven, its rotational force is transmitted to the rotating body 5 via the shaft 6 and the rotating body 5 rotates. The rotating shaft 5 is provided with a support shaft 8 at an eccentric position and a rectangular drill 9 is connected to the support shaft 8.
Rotate like a parallel link. In order to excavate the ground efficiently, the excavator 9 moves in the parallel link in this manner.
1 and 2 on the outer periphery of the cutter spokes 9a to 9d.
As shown in (1), a cutting blade 15 is provided, and thereby the ground is excavated.

Thus, the excavated earth and sand is taken into the face chamber 4 and, along with the excavation via the jack 14, the excavated earth and sand in the face chamber 4 is discharged to the outside by the earth discharging device 13 and rearward. By incorporating a segment (not shown) using an erector, a horizontal shaft can be built.

In this case, for example, in FIG.
When it is desired to perform overdigging on the right side as shown by, if the right-side jacking jacks 12a and 12b shown in FIG. 4 are extended by the same amount as shown by the arrow r, the other end is supported by the vertical member 11b. As shown in FIG. 2, the second and third partition portions 3a and 3c slidable by the slide portion 10 are pressed by one ends of the jacks 12a and 12b to cut the outer peripheral portion on the right R. 15 moves to the right side as indicated by the dotted line in the figure, so that the right side can be dug.

The upper excavation jacks 12e to 12e having one ends connected to the first and third partition walls 3a and 3c.
2f and the lower extra jacks 12k, 12l
Since the other ends thereof are slidably supported in the left-right direction with respect to the horizontal member 11c, these jacks 12e,
The movements of the partition walls 3a, 3c are not hindered by 12f, 12k, 12l.

Excavation to the left can be performed by operating the jacks 12c and 12d for excavation on the left side on the opposite side. In addition, for the upper side, the upper extra jacks 12e to 12h,
Further, the lower jacks 12i to 12i
1 may be used.

FIGS. 5 to 13 show a second embodiment of the present invention. This embodiment has a simpler structure than the underground excavator of the first embodiment described above, and allows the partition wall 33, and consequently, the excavating tool 31 to be slidable in any direction so as to be able to perform excavation if necessary. Also, it is configured such that the earth shaving is not sandwiched when the partition wall 33 or the excavation tool 31 is moved.

FIG. 5 is a longitudinal sectional view of a second embodiment of the present invention, and FIG. 6 is a front view of the same, showing an example of an underground excavator 30 capable of obtaining a substantially elliptical excavation section. And
In this embodiment, the cutter spoke 32 and the partition wall 33 of the digging tool 31 are not divided as in the first embodiment, and the construction is simpler, so that the manufacturing becomes easier and the cost is reduced. Also has the advantage of being inexpensive. Hereinafter, the configuration of the underground excavator will be described in detail.

In this embodiment, the shield tube 34 is formed in a substantially elliptical shape when viewed from the front. A partition 33 having a corresponding shape is provided in front of the inside thereof.
A drilling tool 31 having a substantially elliptical shape as a whole is provided in front of. The excavating tool 31 has a substantially elliptical shape, and has a frame-shaped cutter spoke 32 provided with a cutting blade 35 at a front portion.
And an inner space portion of the frame-shaped cutter spoke 32 is connected between the upper and lower portions thereof.
5 is provided with an appropriate number of cutter spokes 32a.

The rear portion of the cutter spoke 32a is connected to a parallel link rotating device for rotating in a parallel link. This parallel link rotating device is basically similar to the above-described first embodiment, in which a support shaft 36, a rotating body 37 provided with the support shaft 36 at an eccentric position, and a front end connected to a rear portion of the rotating body 37 are connected. In addition, a shaft 38 penetrating the partition wall 33 through the bearing 40 and functioning as a drive shaft connected to a drive motor 39 provided behind the partition wall 33 is provided. In this case, as shown in FIG. 7, for example, four shafts 38 are arranged on the left, right, up and down.

Next, the sliding mechanism of the partition wall 33 will be described. At the rear of the partition wall 33, as shown in FIG.
Slide jacks 41a to 41f for excavation are provided on the upper, lower, left and right sides, respectively. That is, jacks 41a, 41 for left and right digging are provided on the left and right of the partition wall 33.
b, one end of each of the jacks 41a, 41b is connected to the back surface of the partition wall 33 via a support member 48, and the other end is provided on the outer peripheral side of the partition wall and fixed to the inner periphery of the shield tube 34. Is supported by a slide member 43 fixed to the side of the reinforcing member 42. The support member 48 is a member that is fixed to the partition wall 33 and transmits the expansion and contraction force of the jacks 41 a and 41 b to the partition wall 33 and slides the partition wall 33.

In addition, jacks 41c to 41f for excavation are provided at upper and lower portions of the rear part of the partition wall 33, and one end of the inner ends of these jacks 41c to 41f is the same as the jacks 41a and 41b described above. It is connected to the back of the partition wall 33. The other ends of the jacks 41c to 41f are supported by slide members 43 fixed to the reinforcing member 42, respectively, and the other ends of the jacks 41a to 41f are slidable by the slide member 43.

The other end of each of the jacks 41a to 41f is slidable, as will be described in detail later.
When the jacks 41a, 41b or 41c-41f for left and right extra digging and upper and lower digging of 1a-41f are operated, the movement of the partition wall 33 is not hindered.

FIG. 10 and FIGS. 11, 12 and 13 in section AA thereof show one structural example in which the other ends of the jacks 41a to 41f are slidable. That is, jack 4
The other end of 1a has an inverted T-shape in the state shown in the figure, and has a neck portion a and a circular flange b connected to an outer end thereof. The slide member 43 has a hole 43a having a larger diameter than the neck portion a, and a chamber 43b communicating with the hole 43a and having a larger diameter than the flange b for accommodating the flange b.
The flange b is formed inside the chamber 43b, for example, as shown in FIG.
As shown in FIGS. 12 and 13, it is possible to slide in a certain direction from the state of FIG. Other jacks 41b-4
1f is the same. In addition, as the slide structure, for example, a pin structure using a pin may be used.

In addition, in FIGS.
Is a soil discharging device such as a screw conveyor, the front end of which is connected to the center of the lower part of the partition wall 33, for discharging the shaved soil in the face chamber 45 to the outside as the excavation proceeds. Also,
As shown in FIG. 5, an outer peripheral portion of the partition wall 33 is provided with a gap 47 at an intermediate portion of a sealing and holding plate 46 protruding in the front and rear thereof in a rib shape.
Is loosely fitted in a sandwich shape. These sealing and holding plates 46 are for holding the partition wall 33 and securing a predetermined amount of movement of the partition wall 33, and for preventing earth shaving from flowing into the inside of the pit from the face chamber 45.
4 and the earth discharging device 44. In FIG. 5, reference numeral 48 denotes a jack for excavation provided in the shield cylinder 34 between the reinforcing member 42 and a reaction force receiver (not shown).

In operation, the operation of the excavator 31 is the same as that of the first embodiment. As shown in FIG. 8, one of the jacks 41a for left and right digging is extended as shown by the arrow, and the other jack 4 on the opposite side is dug.
1b in the same direction, as shown in FIG.
Can be moved to the right R with respect to the traveling direction. Therefore, the excavator 31, the support shaft 36, the rotating body 37, the shaft 38, the support member 48, and the like also move. In this case, since the other ends of the other jacks 41 c to 41 f for vertical excavation are slidable by the slide member 43, the jacks 41 c to 41 f move together with the partition 33 without hindering the movement of the partition 33.

In order to move the partition 33 upward, the upper jacks 41c and 41d are extended, and the lower jack 41c is extended.
e and 41f may be contracted, and the jacks 41c to 41f may be operated in the opposite manner to move the partition wall 33 and the excavator 31 as needed. In the direction to carry out overdigging. In such a movement, the partition wall 33 is a single piece, the outer peripheral portion is loosely fitted in the gap 47 of the seal and holding plate 46, and the excavating tool 31 is integrated, so there is no pinching of the earth shaving.

[0035]

As described above , the parallel link according to the present invention is provided.
Underground excavator of the type equipped with an excavating tool
Te is greater to Rukoto without unnecessarily cross drilling tool,
Excavation is enabled, and excavation resistance does not increase during excavation, so that excavation can be performed smoothly.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a first embodiment of an underground excavator according to the present invention.

FIG. 2 is a front view of the underground excavator according to the first embodiment viewed from a direction AA.

FIG. 3 is a sectional view taken along line BB in FIG. 1;

FIG. 4 is a sectional view taken along line CC in FIG. 1;

FIG. 5 is a longitudinal sectional view of a second embodiment of the present invention.

FIG. 6 is a front view of the underground excavator as viewed from the direction AA.

FIG. 7 is a sectional view taken along line BB in FIG. 5;

FIG. 8 is a sectional view taken along line CC in FIG. 5;

FIG. 9 is an explanatory view of a partition showing the movement of the partition as viewed from the front.

FIG. 10 is a structural view of a jack and a slide member at the other end.

FIG. 11 is a sectional view taken along line AA in FIG. 10;

FIG. 12 is an explanatory diagram showing a sliding state of a jack.

FIG. 13 is a sectional view taken along line BB in FIG. 12;

FIG. 14 is a longitudinal sectional view of a conventional example.

FIG. 15 is a sectional view taken along line AA in FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Underground excavator 2 Shield cylinder 3 Partition wall 3a-3d 1st-4th partition part 4 Face room 5 Rotating body 6 Shaft 6 'Bearing 7 Drive motor 8 Support shaft 9 Excavator 9a-9d 1st-4th Cutter spoke 10 Slide portion 10a Connecting rod 11 Reinforcement member 11a Outer frame 11b Vertical member 11c Horizontal member 12a to 12l Jack 13 Discharger 14 Drilling jack 30 Underground excavator 31 Drilling tool 32, 32a Cutter spoke 33 Partition wall 34 Shield tube 35 Cutting Blade 36 Supporting Shaft 37 Rotating Body 38 Shaft 39 Drive Motor 40 Bearing 41a to 41f Jack 42 Reinforcement Member 43 Slide Member 44 Earth Removal Device 45 Cutting Face Room 46 Sealing and Holding Plate 47 Gap 48 Supporting Member

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Ryo Terashima 1-24-4 Shinkawa, Chuo-ku, Tokyo Inside Daitoyo Construction Co., Ltd. (72) Inventor Yukihiro Kitamura 24-24 Shinkawa, Chuo-ku, Tokyo Daitoyo Construction (56) References JP-A-2-256799 (JP, A) JP-B-3-80240 (JP, B2)

Claims (1)

(57) [Claims] A support shaft is provided at an eccentric position of a plurality of rotating bodies.
In an underground excavator provided with an excavator that rotates in a parallel link via these support shafts, the excavator is provided in front, and is slidable left and right or up and down inside the shield tube. One end of each of a plurality of jacks for vertical sliding is connected above and below the rear portion of the supported partition via a support member, and the other ends of these jacks are slidable on a support portion provided at the rear of the partition. Along with the connection, one end of each of a plurality of jacks for lateral sliding is connected to the left and right sides of the rear part of the partition via a support member, and the other ends of these jacks slide on support parts provided at the rear part of the partition. Underground, characterized in that the jacks and the excavator provided in front of the bulkhead can be slid in a predetermined direction by these jacks. Cutting machine.