JPH074185A - Folding type shield machine - Google Patents

Abstract

PURPOSE:To prevent the rear section of a screw conveyor from coming in contact with peripheral equipment at the time of folding a shield machine, and cutter torque from being restricted. CONSTITUTION:A forward shield 1a is formed to be capable of turn relative to a rear shield 1b, thereby constituting a shield body 1 to be foldable. Also, the bulkhead 9 of the forward shield 1a is provided with a large-diameter gear 7a for the reduction mechanism 7 of a cutter drive device 6 and a screw end casing 11. Regarding the folding type shield machine where a screw conveyor 3 is connected to the casing 11 so as to be capable of turn in the vicinity of the gear 7a, the screw conveyor 3 is connected to the end of the casing 11, using a flexible tube connector 17 of wear resistance rubber. In addition, the conveyor 3 is pivotally supported on a bearing pin 18 in such a way as capable of turn, and turned and displaced in a direction opposite to a folding direction, when the shield body 1 is folded. The rear section of the conveyor 3 is thereby prevented from coming in contact with peripheral equipment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield excavator in which a shield main body is bent in the middle to enable excavation.
The present invention relates to a shield machine, in which a mounting mechanism for mounting an earth discharging device such as a screw conveyor to a bulkhead provided in the shield body is suitable for medium-bending.

[0002]

2. Description of the Related Art In a shield machine for excavating an underground mine such as a tunnel, it may be necessary to change the direction of excavation and to make a bend, for example, when excavating a curved tunnel. Particularly recently, since underground excavation work by shield excavators is concentrated in urban areas, it is difficult to install the vertical shaft required for the construction at the ideal position, or the existing underground Problems such as those that must be avoided have arisen, and the need to change the direction of excavation is increasing. As a shield excavator that can meet such demands, a so-called center-break shield excavator configured so that the shield main body is divided into a plurality of shields and these shields are rotatably connected to each other so that the shield can be folded in the middle. It has been known. In such a center-breaking shield excavator, when the shield is rotated to change the excavation direction, the earth excavating mechanism such as the screw conveyor attached to the bulkhead as the partition of the shield also rotates as the shield rotates. However, the situation may occur such that the machine is displaced and comes into contact with the equipment installed in the shield machine, or becomes an obstacle to work inside the machine. For this reason, various types of center-breaking shield excavators have been developed that have been devised in the mechanism for attaching the soil discharging mechanism to the bulkhead to prevent such a situation from occurring. The present invention is intended to further improve such a conventionally-developed center-breaking shield excavator.

Then, a general type of the conventional folding type shield machine, which has been used conventionally, will be described with reference to FIGS. 3 and 4. FIG. FIG. 3 is a side view showing an internal structure of a conventional center-folding shield machine, and FIG. 4 is a side view showing a mechanism of a main part of the center-folding shield machine of FIG.

In FIGS. 3 to 4, 1 is a shield main body, 1a is a front shield constituting the shield main body 1, 1b is a rear shield, and 2 is a center-folded portion which is swingably connected between these shields. The center-folded jack 2 is provided on the left and right, although only one is shown in the drawing. Front shield 1a
Is connected to the rear shield 1b so as to be rotatable by upper and lower connecting pins or the like provided on the same axis, and is rotated by the difference in expansion and contraction of the left and right center folding jacks. Make a bent posture. In this way, the shield body 1 is configured to be capable of being bent in the middle by dividing the shield body into a plurality of shields and rotatably connecting the shields. 3 is a screw conveyor as an earth discharging mechanism for transporting and discharging the excavated earth and sand excavated by a cutter, 4 is a screw driving device for driving the screw of the screw conveyor 3, and 5 is for excavating the face. The face excavating cutter 6 is a cutter driving device for driving the cutter 5.

Reference numeral 7a is a large-diameter gear for deceleration for decelerating and transmitting the rotational power of the cutter driving device 6 to the cutter 5, and 7a.
Reference numeral b is a pinion that is connected to the output shaft of the cutter driving device 6 and transmits the rotational power of the cutter driving device 6 to the gear 7a having a large diameter. The pinion 7b and the gear 7a are used to reduce the speed of the cutter driving device 6. Make up 7. Therefore,
The rotational power of the cutter driving device 6 is reduced to a predetermined speed by the gear ratio between the pinion 7b and the gear 7a of the reduction mechanism 7 and transmitted to the cutter 5. As a result, the cutter 5
The required cutter torque can be obtained by selecting the gear ratio, and the required cutter torque determined by the soil quality sets the size of the cutter driving device 6 and the number of installed cutters. Apart from this, it can be obtained by setting the gear ratio between the pinion 7b and the gear 7a to an appropriate value.

Reference numeral 8 denotes a gear box for covering the gear 7a and the pinion 7b, and 9 denotes a partition wall which is airtightly provided on the front shield 1a so as to partition an outer space on the face of the face and an inner space for a worker to work. It is a bulkhead. A gearbox 8 is attached to the bulkhead 9 at a central position, a large-diameter gear 7a is pivotally supported, and a screw conveyor 3 is attached to a lower opening portion thereof. Further, the gear box 8 has a cutter driving device 6 attached to the outside and a pinion 7b supported inside thereof. 10 is a universal pipe joint for rotatably attaching the screw conveyor 3 to the bulkhead 9, 11 is provided in the bulkhead 9, and by connecting the screw conveyor 3 via the universal pipe joint 10, This is the most advanced screw casing for attaching this to the bulkhead 9. When the front shield 1a is rotated in order to make the shield body 1 in the folded posture, the screw conveyor 3 also rotates as described above.
Displacement may cause a situation such as contact with equipment installed in the shield machine, but this universal pipe joint 10
Is a mechanism for preventing the occurrence of such a situation, which is enlarged and shown in FIG. As is clear from FIG. 4, the universal joint 10 includes the screw conveyor 3
The spherical convex portion formed on the outer peripheral surface of the front casing 3a, and the spherical convex surface having the same curved surface as the convex portion formed on the inner peripheral surface of the screw tip casing 11 so as to be fitted into the spherical convex portion. And the concave part of the. A groove is formed in this spherical convex portion, and a ring-shaped sealing member 12 is incorporated therein, so that the earth and sand conveyed by the screw conveyor 3 leaks to the outside from between the spherical concave and convex portions, or penetrates into the gap between them. This prevents the screw conveyor 3 from becoming a resistance when rotating.

In FIG. 3, 13 is a turnbuckle type supporting device for supporting the screw conveyor 3 composed of a turnbuckle whose length can be adjusted on the front shield 1a, and 14 is a pit of an underground mine. A segment for lining the wall, 15 is an erector that is a device for performing the lining work by the segment 14, and 16 is installed on the rear shield to propel the shield body 1 while taking a reaction force at the segment 14. It is a shield jack.

Since the conventional center-breaking shield excavator has the above-mentioned structure, the cutter jack 5 advances the shields 1a and 1b while the cutter 5 advances the face, and the excavated earth and sand are excavated. It is conveyed to the inside of the machine through the screw conveyor 3, discharged, conveyed to the ground by an appropriate conveying device and discarded, and the underground pit is excavated through these operations. In the process of performing such excavation, when the front shield 1a is rotated by the center-folding jack 2 while the screw conveyor 3 is left in a fixed position, the shield body 1 is center-folded. Since it is attached to the bulkhead 9 of the front shield 1a, the front shield 1a is displaced along with its rotation.
5, contacting or approaching 5 may interfere with the work for assembling the segment 14 in the underground wall of the underground mine by the turning operation of the erector 15, or the rear part of the screw conveyor 7 may collide with the constructed segment 14. Things happen. However, since the screw conveyor 3 is attached to the bulk head 9 by connecting the screw conveyor 3 to the most advanced casing of the screw, in particular, via the universal pipe joint 10, a turnbuckle type supporting device is provided. By appropriately adjusting the length of 13 and at the same time, the shaft center of the screw conveyor 3 is previously rotated and displaced by a predetermined angle in a direction opposite to the direction in which the screw conveyor 3 is folded, and is fixed by an appropriate means. The occurrence of such a situation can be prevented.

[0009]

Since the conventional center-folding shield machine has a universal pipe joint 10 for rotatably mounting the screw conveyor 3 with respect to the bulkhead 9 as described above. Although the above-mentioned inconvenience caused by the rotation and displacement of the screw conveyor 3 when the shield body 1 is folded in the middle can be eliminated, the performance of the excavator is improved by providing the universal pipe joint 10. A new serious problem arises that constrains That is, in the shield machine
Although the required cutter torque determined by the soil quality is obtained by setting the gear ratio between the pinion 7b and the gear 7a to an appropriate value as described above, the universal pipe joint 10 has a spherical convex shape. Since it forms a part, the outer diameter of the screw conveyor 3 increases at that part, and as a result of this, the size of the gear box 8 is limited accordingly. Since this universal pipe joint 10 usually has a thickness of about 80 mm only on the upper and lower sides, the outer diameter of the gear box 8 must be reduced by about 160 mm by providing the joint 10 as compared with the case where it is not provided. Becomes As a result, the outer diameter of the large-diameter gear 7a provided in the gear box 8 is also limited, the momentary cutter torque is regulated, and the type of soil that can be excavated is also limited. .

The present invention has been made in view of the above problems in the prior art, and aims to improve the problems.
When breaking the shield body in the middle, prevent the soil discharge device from contacting the equipment installed in the shield machine and obstructing the work inside the machine, as well as the conventional technology. It is an object of the present invention to provide a center-breaking shield machine, which is not only capable of being cut but is not restricted by the cutter torque as in the conventional technique.

[0011]

The object of the present invention is to provide "a cutter for excavating a face, a cutter driving device for driving the cutter, and a plurality of shields which are divided into a plurality of shields. The shield body is configured to be able to be bent in the middle by pivotally connecting it, the bulkhead provided on the front shield, and the rotational power of the cutter drive device provided on this bulkhead is reduced to the cutter for face excavation. And a reduction gear mechanism of the cutter drive device, which is composed of a large-diameter gear for speed reduction for transmission and a pinion for transmitting rotational power of the cutter drive device to the large-diameter gear,
An earth discharging device for discharging excavated earth and sand and a casing for attaching the earth discharging device to the bulk head by connecting the earth discharging device are provided, and the earth discharging device has a gear with a large diameter. In a center-folding shield machine that is rotatably connected in the vicinity, the inlet-side end of the soil discharging device is spaced from the end of the casing by a flexible pipe connecting member. It is connected airtightly so that it can rotate in the state, and the earth removal device is pivotally supported so that it can rotate in the direction corresponding to the center folding direction of the shield body. This is achieved by a center-break shield excavator as described in the claims.

[0012]

The center-breaking shield machine according to the present invention has such a structure. Therefore, when the front shield provided with the bulkhead is rotated to break the shield body, If the earthmoving device is rotated and displaced by an appropriate angle in the direction opposite to the rotating direction of the shield in front of the flexible pipe connecting member, the earthmoving device is installed in the shield machine. It will not come into contact with damaged equipment or interfere with work on board.

[0013]

Embodiments of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a side view showing the internal structure of a center-folding shield machine of the embodiment of the present invention, and FIG. 2 is a side view showing a mechanism of a main part of the center-folding shield machine of FIG. Figure 1
In FIG. 2 and FIG. 2, the parts denoted by the same reference numerals as those in FIGS. 3 and 4 represent the same parts in these drawings,
Detailed description is omitted to avoid duplication of description.

The center-breaking shield machine shown in FIGS. 1 and 2 according to the present invention is similar to the conventional machine shown in FIGS. 3 and 4, and has a cutter 5 for excavating a face and this cutter 5. A cutter driving device 6 for driving a front shield 1a and a rear shield 1b.
Shield body 1 configured to be capable of being folded inward by rotatably connecting a and 1b, bulkhead 9 provided on front shield 1a, and rotation of cutter driving device 6 provided on this bulkhead 9. A cutter driving device including a deceleration large-diameter gear 7a for decelerating and transmitting power to the cutter 5, and a pinion 7b for gearing the rotational power of the cutter driving device 6 to the large-diameter gear 7a. 1 reduction gear mechanism 7, a screw conveyor 3 for transporting and discharging the excavated earth and sand of the face excavated by the cutter 5, and the screw conveyor 3 provided on the bulkhead 9 and attached to the bulkhead 9 by connecting the screw conveyor 3 And a screw conveyor 3 is rotatably connected to the casing 11 when connecting the screw front end casing 11 to the casing 11. It has to. In the present embodiment, in view of the problem described in the “Problems to be solved by the invention” in the conventional center-bending shield machine, the screw conveyor 3 can be rotated to the screw frontmost casing 11. The mounting mechanism was improved.

The improvement will be described with reference to FIGS. 1 and 2. In FIG. 1 and FIG. 2, 17 rotates the front casing 3a of the screw conveyor 3 with respect to the screw frontmost casing 11. A flexible cylindrical tube connecting member made of a material such as abrasion resistant rubber for airtight connection for obtaining, 18 is provided vertically at its bottom for pivotally supporting the screw conveyor A support pin as a rotation support shaft is provided, and a support pin fitting bracket 19 is provided below the front shield 1a and has a vertical fitting hole into which the support pin 18 is rotatably fitted. The inlet side end of the front casing 3a of the screw conveyor 3 was connected in such a manner that it overlaps with the end of the screw tip casing 11 in the conventional example, but in the present embodiment, the screw tip casing 11 is connected. Connected with the end of the
It is in a position different from the conventional example.

Since this embodiment has the above-mentioned structure, when the shield main body 1 is folded in the middle, the length of the turnbuckle type supporting device 13 is appropriately adjusted and, at the same time, the screw conveyor 3 is rotated. By preliminarily rotating and displacing the shaft center by a predetermined angle in a direction opposite to the direction in which it is bent at the portion of the flexible cylindrical pipe connecting member 17, and fixing it by an appropriate means, The situation in which the clew conveyor 3 comes into contact with the equipment installed in the shield machine or interferes with the work inside the machine,
It can be avoided as in the prior art. When the screw conveyor 3 is rotatably connected to the screw tip casing 11 in the vicinity of the large-diameter gear 7a, the screw conveyor 3 does not need to be connected via the universal pipe joint 10 as in the conventional technique, but is particularly flexible. Since the connection is made by the flexible cylindrical connecting member 17, the screw conveyor 3 is provided in the vicinity of the large-diameter gear 7a as in the conventional technique while having the same effect as the conventional technique. The outer diameter does not increase, and as a result, the outer diameter of the large-diameter gear 7a is not restricted and the cutter torque is not restricted. At the same time, as in the prior art, on the peripheral surface of a cylindrical body that is difficult to process, such as the screw front-end casing 11 and the front casing 3a, particularly on the inner peripheral surface of the screw front-end casing 11 that is extremely difficult to process. There is no need for spherical processing. Moreover, the seal member 12 is not required, and the labor for assembling the seal member 12 by forming the groove portion in the spherical convex portion of the front casing 3a is not required unlike the prior art. As described above, according to the present embodiment, compared to the conventional technology, the cutter torque is not regulated, and difficult processing of parts is not involved, so that a shield machine having excellent performance and production efficiency is provided. can get.

In this embodiment, the screw conveyor 7 is used as the earth discharging device for carrying and discharging the excavated earth and sand of the face.
The present invention can be naturally applied even when an earth discharging device other than the screw conveyor is used. Further, in this embodiment, only the example in which the present invention is applied to the shield excavator having the two-folded shield is shown, but it is naturally applicable to the three-fold type shield excavator.

[0018]

As is apparent from the above description, the present invention relates to the construction described in the claims, particularly, "The inlet side end of the earth removing device is provided by the flexible pipe connecting member. , The air-tight connection is made so that it can rotate with a gap from the end of the casing provided on the bulkhead, and the earth removing device is turned in the direction corresponding to the folding direction of the shield body. Since it has a configuration that it is rotatably supported so that it can move, when the shield body is folded in the middle, the earth removal device comes into contact with the equipment installed in the shield machine or inside the machine. Not only can it prevent the occurrence of situations such as obstacles to the work of the same as in the conventional technology, but the cutter torque is not restricted as in the conventional technology. Machine can be provided Further, unlike the conventional technique, it is not necessary to perform spherical processing on the peripheral surface of the cylindrical body which is difficult to process, particularly the inner peripheral surface which is extremely difficult to process. Moreover, unlike the prior art, it is not necessary to provide a seal member at the connecting portion to the casing of the soil discharging device, and there is no need to form the groove portion in the spherical convex portion of the connecting portion to assemble the seal member. I don't need it. As described above, according to the present invention, the cutter torque is not restricted and the difficult machining of the parts is not performed as compared with the conventional technology, and therefore, it exhibits an excellent effect as a field technology in terms of both machine performance and production efficiency. However, it is extremely practical.

[Brief description of drawings]

FIG. 1 is a side view showing the internal structure of a center-breaking shield machine according to an embodiment of the present invention.

FIG. 2 is a side view showing a mechanism of a main part of the center-bending shield machine shown in FIG.

FIG. 3 is a side view showing the internal structure of a conventional center-folding shield machine.

4 is a side view showing a mechanism of a main part of the center-folding shield machine shown in FIG. 3. FIG.

[Explanation of symbols]

 1 Shield Main Body 1a Front Shield 1b Rear Shield 2 Middle Broken Jack 3 Screw Conveyor 3a Screw Conveyor Front Casing 5 Cutter Excavator 6 Cutter Drive 7 Cutter Drive Reducer 7a Large Diameter Gear for Reduction 7b Pinion 8 Gear Box 9 Bulkhead 11 Screw Cutting Edge Casing 13 Support Device 14 Segment 15 Elector 16 Shield Jack 17 Flexible Cylindrical Pipe Connecting Member 18 Support Pin 19 Support Pin Fitting Bracket

Claims (1)

[Claims] 1. A cutter for excavating a face, a cutter driving device for driving the cutter, and a plurality of shields which are rotatably connected to each other so as to be capable of being bent in the middle. A shield main body, a bulkhead provided on the front shield, and a large-diameter gear for deceleration for decelerating and transmitting the rotational power of the cutter drive device provided on the bulkhead to the cutter for face excavation. A deceleration mechanism of the cutter driving device, which is composed of a pinion for transmitting the rotational power of the cutter driving device to the gear of the large diameter, a discharging device for discharging excavated earth and sand, and a discharging device provided on the bulkhead. And a casing for attaching it to the bulkhead by connecting the soil device,
In an intermediate-breaking shield excavator in which an earth discharging device is rotatably connected to a casing near a large-diameter gear, the inlet side end of the earth discharging device is connected to the casing by a flexible pipe connecting member. It is connected airtightly so that it can rotate in the state where it is spaced apart from the end of the shield, and the earth removing device rotates so that it can rotate in the direction corresponding to the folding direction of the shield body. A center-breaking shield excavator characterized by being pivotally supported as much as possible.