JP3504643B2 - Screw conveyor for shield machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield machine (including a tunnel excavator) capable of excavating various ground such as rock and soft ground, and a screw conveyor for discharging excavated soil such as mud, The present invention relates to a screw conveyor for a shield machine having a gate that closes the inside of the housing to stop water when inspecting or repairing the inside of the conveyor.

[0002]

2. Description of the Related Art This type of shield machine is equipped with a cutter disk for cutting the ground, which is rotatably provided at the tip (front end) of a cylindrical shield (shield) that prevents collapse of the earth wall, and is excavated by the cutter disk. A cutter chamber for taking in the earth and sand is formed at the front end of the shield by a bulkhead (partition wall). The earth and sand taken into the cutter chamber is discharged from the bulkhead by a screw conveyor arranged rearward in the shield. Screw conveyors typically include a cylindrical conveyor housing and a screw auger axially disposed within the housing and rotated by a drive motor. In addition, it is equipped with propulsion means (shield jack) for advancing them, and it can dig a tunnel safely and surely without penetrating into the ground and affecting the surface of the earth.

By the way, a screw conveyor is usually equipped with a cutter chamber to remove soil from a cutting face when removing gravel or the like that has been mixed with excavated soil in the conveyor housing and checking the wear state of the screw auger. Since pressure is applied and there is a risk that taken-in earth and sand, muddy water, etc. will leak into the shield, a gate that shuts off the water by blocking the inside of the screw conveyor housing is provided at the tip end so that it can be opened and closed. Further, such a water blocking gate is conventionally provided so that the gate opens and closes in a direction orthogonal to the axial direction of the screw conveyor, in other words, in parallel to the surface of the bulkhead.

Another prior art is Japanese Patent Laid-Open No. 8-4485.
There is a screw conveyor described in the publication. In this screw conveyor, a part of the screw auger is cut out in the circumferential direction of the conveyor housing, and an intermediate gate for opening and closing the inside of the conveyor housing is provided by coding the cutout portion.

[0005]

The conventional water shutoff gates including the intermediate gates described in the above publications are moved and opened and closed in the direction orthogonal to the axial direction of the screw conveyor, so that the following problems occur. is there. That is, since the gate opens and closes in the direction orthogonal to the screw conveyor, a considerably large mounting space must be secured. Therefore, for example, in order to increase the excavation speed of the shield excavator, the drive device for rotating the cutter disk is enlarged, and the diameter of the conveyor including the screw auger is increased to improve the soil discharging capacity of the screw conveyor. Doing so may interfere with the drive device and other devices when opening and closing the water shutoff gate.

Further, in order to move the water stop gate in the direction orthogonal to the axial direction of the screw conveyor, it is necessary to engage with the main body of the excavator, and the opening / closing device of the water stop gate becomes large in scale, and the production cost is also increased. To do.

Further, in the screw conveyor described in the above publication, a part of the screw auger is cut in the circumferential direction of the housing so that the tip of the screw auger can be projected into the forward cutter chamber beyond the water stop gate. Although not provided, the provision of such notches complicates the structure of the screw auger and water stop gate, and
The strength of the screw auger may be weakened and durability may be reduced.

An object of the present invention is to provide a water stop gate for opening and closing the vicinity of the tip of the soil discharging screw conveyor so that it can be opened and closed in the axial direction of the screw conveyor to minimize the occupied space, and especially in the space inside the shield. It is possible to provide a screw conveyor for a shield machine, which enables a water-stop gate to be installed even when there is not enough space, eliminates the need for interaction with the machine body, simplifies the gate opening / closing mechanism, and reduces size. .

Another object of the present invention is to allow a screw auger having a tip protruding into the cutter chamber to be drawn into the conveyor housing to open and close the water stop gate, and to inspect and repair the screw auger and the conveyor housing. It is to provide a screw conveyor for a shield machine that facilitates

Still another object of the present invention is to adopt an open construction method for excavating and excavating the natural ground that does not apply earth pressure to the cutter, or applying earth pressure to the cutter, depending on the condition of the ground. It is an object of the present invention to provide a screw conveyor for a shield machine, which can adopt a mud pressure method of excavating and excavating in a state.

[0011]

A screw conveyor of a shield machine according to the present invention is a shield machine for excavating a tunnel while excavating earth and sand excavated by a cutter disk provided at a tip into a cutter chamber and discharging the soil by a screw conveyor. In the machine, the tip of the conveyor housing of the screw conveyor is connected to the bulkhead behind the cutter chamber, the tip of the screw auger is projected into the cutter chamber, and the tip of the screw auger is pulled into the conveyor housing. A water blocking gate that is configured as possible and is curved in an arc shape in the longitudinal direction is arranged in the axial direction of the conveyor housing, and the vicinity of the tip of the inside (opening) of the conveyor housing via a driving device such as a jack that is also arranged in the axial direction. Configured to open and close Than it is.

According to the screw conveyor of the shield machine according to the present invention having the above-mentioned structure, the water stop gate is arranged in the axial direction of the screw conveyor, and the driving of the jack or the like for opening and closing the water stop gate. The device is also arranged in the axial direction of the screw conveyor, and the water stop gate moves in parallel with the axial direction of the screw conveyor to open and close. It is not necessary to secure a wide space required for opening and closing the water stop gate near the tip of the screw conveyor in the direction orthogonal to the gate like the gate. this is,
For example, even if the screw conveyor or cutter disk drive is enlarged due to the increase in the speed of the shield machine, it is not possible to secure sufficient space behind the bulkhead. It means that if only a small space along the axial direction can be secured on one side, etc., a water shutoff gate can be installed to open and close the inside of the conveyor housing.

Further, since the earth and sand excavated by the cutter disk is taken into the cutter chamber, it is necessary to rotate the screw auger while projecting the tip end portion thereof into the cutter chamber and discharge it backward. And, when closing the inside of the screw conveyor with the water stop gate, it interferes with the water stop gate unless the tip part of the screw auger is moved rearward from the closed position of the water stop gate. Since it can be pulled into the conveyor housing, it is not necessary to change the water stop gate and screw auger to a complicated structure that can cross each other.

Further, by bending the water stop gate in an arc shape in its longitudinal direction, if the water stop gate is moved in the axial direction of the screw conveyor, the inside of the conveyor housing is closed or released from the closed state. The movement is smooth. Of course, in the case of the present invention, the opening / closing line (guide groove) of the water stop gate at the front end of the housing of the screw conveyor must be formed in an arc shape corresponding to the arc shape of the water stop gate.

According to a second aspect of the present invention, the conveyor housing main body is attached to a support column disposed in the shield machine near its tip end so as to be movable back and forth in the axial direction (front-back direction) via a jack. Conveyor housing tip (conveyor housing excluding main body)
Has a double-wall structure and is configured to be slidable in the axial direction relative to each other. The tip of one peripheral wall (for example, outer peripheral wall) is fixed to the bulkhead, and the base of the other peripheral wall (for example, inner peripheral wall) is fixed. It is preferable that the end is connected to the tip of the conveyor housing body and is configured to be retractable with respect to the support column together with the conveyor housing body and the screw auger.

In the screw conveyor according to a second aspect of the present invention, the main body of the conveyor housing excluding the tip portion and the screw auger are attached to the columns so as to be movable back and forth in the front-rear direction. Therefore, when closing the waterproof gate, the main body of the conveyor housing is retracted. By doing so, at the same time that the screw auger retracts, one peripheral wall of the conveyor housing front end portion connected to the main body retracts with respect to the other peripheral wall (fixed to the bulkhead). As a result, the protruding portion of the screw auger is drawn into the conveyor housing from the inside of the cutter chamber, and the tip of the conveyor housing can be closed by the water stop gate. The water stop gate is opened and closed along a guide groove provided on the peripheral wall on the side fixed to the bulkhead. Then, by further retracting the conveyor housing body, one peripheral wall of the conveyor housing tip portion is further retracted rearward from the rear end of the other peripheral wall, and the tip portion of the screw auger is exposed,
It is possible to repair or replace the tip of the screw auger.

As described in claim 3, the base end (rear end) of the screw auger is connected to a drive motor installed on the base end (rear end) of the conveyor housing main body, and the screw is connected to the drive motor. The auger and the conveyor housing main body are integrally formed on the base end side thereof, and a part of the conveyor housing main body has a double wall structure on the front end side of the drive motor so that one peripheral wall and the other peripheral wall are formed. It is configured to be slidable in the axial direction, and the other slidable peripheral wall can be retracted with respect to one of the peripheral walls via a jack together with the conveyor housing main body base end side including the drive motor installation position and the screw auger. It is preferable to configure

According to another aspect of the screw conveyor of the present invention, the conveyor housing main body can be moved forward and backward by a jack as in the second aspect, and in addition, a part of the main body including the drive motor in the conveyor housing main body. By advancing and retracting (in other words, expanding and contracting) in the front-rear direction together with the screw auger, the screw auger can be retracted with respect to the front end of the conveyor housing. For this reason, when excavating by the open method of excavating the cutter disk without applying earth pressure, the tip of the screw auger is greatly projected into the cutter chamber and rotated to discharge the earth and sand taken into the cutter chamber. be able to. Also, when excavating with the mud pressure method of excavating with the earth pressure from the cutting face acting on the cutter disk, the mud pressure also acts inside the cutter chamber, and the taken in sand is pushed out into the conveyor housing. The tip of the screw auger that largely projects into the cutter chamber can be retracted by the jack to reduce the amount of projection. Therefore, by rotating the screw auger in this state, the mud in the cutter chamber can be efficiently taken into the conveyor housing and discharged.

Further, as described in the screw conveyor according to the second aspect, the conveyor housing main body is further retracted, and one peripheral wall of the conveyor housing front end portion is further rearwardly retracted from the rear end of the other peripheral wall, whereby the screw auger After exposing the tip, the jack can be expanded or contracted to expose the tip of the screw auger or pull it into the conveyor housing body, so that the tip of the screw auger can be easily replaced or repaired.

According to a fourth aspect of the present invention, a semi-cylindrical hopper having an open upper end is projected below the tip of the screw auger projecting into the cutter chamber so as to be retractable through the bulkhead. Is preferred.

According to the screw conveyor of the fourth aspect, in the screw conveyor of the third aspect, at the time of excavation by the open construction method, the hopper is projected below the tip end portion of the screw auger projecting into the cutter chamber, whereby the cutter Mud that has been cut by a disk and taken into the cutter chamber can be received by the hopper and smoothly discharged through the inside of the conveyor housing at the tip of the rotating screw auger.

As described in claim 5, it is preferable that the wear-resistant metal material is fixed in a spiral shape along the peripheral edge of the screw at the tip portion of the screw auger.

According to the screw conveyor of the fifth aspect, for example, when the screw auger is connected to the drive motor at its rear end portion (base end portion) to rotate the screw auger, the screw auger can be rotated. Since only the end side is supported in a cantilever manner and rotates in the conveyor housing, the tip side of the screw auger is instable and easily contacts the inner peripheral wall of the conveyor housing. Also, the tip of the screw auger projects into the cutter chamber,
Since it rotates in contact with the soil taken in there, it is more likely to wear compared to other parts, but by attaching a wear resistant metal material to the peripheral edge of the screw, it becomes hard to wear and durability is improved. Improved and extended life. Moreover, as described in claims 2 and 3, the tip portion of the screw can be exposed from the conveyor housing in a state where the water shutoff gate is closed, and the exposed amount can be considerably increased. By fixing the wear-resistant metal material spirally over the maximum exposed portion of the screw auger, for example, when the wear-resistant metal material is worn, only the wear-resistant metal material can be easily replaced.

According to a sixth aspect of the present invention, a closed peep window may be provided on the peripheral wall (for example, the inner peripheral wall) of the conveyor housing front end portion connected to the conveyor housing body.

According to the sixth aspect of the screw conveyor, the tip portion of the screw auger is drawn into the conveyor housing from the inside of the cutter chamber, the water blocking gate is closed, and the peripheral wall connected to the conveyor housing body is fixed to the bulkhead. On the other hand, in the retracted state, the wear state can be checked by looking into the tip of the screw auger in the conveyor housing through the viewing window. Therefore, it is not necessary to expose the tip of the screw auger,
Inspection becomes easy.

According to a seventh aspect of the present invention, at the periphery of one of the peripheral walls (for example, the inner peripheral side peripheral wall) of the conveyor housing distal end portion connected to the conveyor housing body and around the tip of the conveyor housing body. Corresponding outward flanges are integrally formed, respectively, and a plurality of bolt holes are bored at intervals in the circumferential direction of both flanges and penetrated, and the flange at the base end of the peripheral wall is the flange at the tip of the conveyor housing body. It is preferable to detachably connect to the above via a bolt.

In the screw conveyor according to claim 7,
Particularly, when the screw auger has a structure in which the rear end of the screw auger is cantilevered and rotated by a drive motor as described in claim 3, the tip end of the screw auger is an inner peripheral surface of a peripheral wall continuous with the conveyor housing body. The peripheral wall of the screw is likely to be worn because it may rotate while coming into contact with the screw. Further, when a wear resistant metal material is fixed to the peripheral portion of the screw as described in claim 4, the peripheral wall is further worn. Since it is easier to perform the replacement, it is necessary to replace the peripheral wall in a relatively short period of time. In such a case, the peripheral wall can be removed from the tip of the conveyor housing main body by removing the bolt, and can be easily replaced with a new peripheral wall.

According to a eighth aspect of the present invention, the base end of the water stop gate is pivotally connected to the upper end of an opening / closing arm which is swingably movable in the front-rear direction by pivotally supporting the lower end of the pillar. The tip of the piston rod of the jack for opening and closing the water stop gate is connected to the upper end of the opening / closing arm, and the jack body is axially arranged on the upper surface of the conveyor housing body and is fixedly supported in the shield such as the bulkhead. (Movably with respect to the conveyor housing body when the conveyor housing body is retracted).

When opening and closing the water stop gate at the tip of the screw conveyor, the linear movement of the jack in the front-rear direction along the axial direction of the screw conveyor is enough to achieve the arc-shaped curved surface of the arc-shaped water stop gate. It is difficult to open and close smoothly unless the diameter is considerably increased, but the screw conveyor according to claim 8 swings and rotates in the front-rear direction (preferably a length corresponding to the radius of the arc surface of the water stop gate). Since the water stop gate is moved via the water stop gate, the water stop gate is guided in an arc shape through the opening / closing arm even if the jack is moved linearly, so that the water stop gate can be smoothly opened and closed. In addition to this, particularly when the conveyor housing main body is retracted as claimed in claim 2, the jack main body slides with respect to the conveyor housing main body even when the jack for opening and closing the water blocking gate is maximally extended. , No excessive force is applied to the jack.

[0030]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a shield machine 1 equipped with a screw conveyor which is an embodiment of the present invention.

As shown in the figure, this shield machine 1 is structurally the same as a general shield machine known in the art, except for a part (a portion of a screw conveyor to be described later). Although omitted, in order to increase the excavation speed, the hydraulic motor 4 that rotationally drives the cutter disk 3 at the tip, the shield jack 5, and the like are enlarged. The tip end of the cylindrical shield 2 is partitioned by the bulkhead 6, so that a cutter chamber 7 is formed between the tip end of the cylindrical shield 2 and the cutter disk 3, and the cutter disk 3 having a roller cutter 3a at its tip is rotatably arranged. There is. An erector 8 is provided in the rear part of the shield 2 so that a cylindrical segment wall S can be constructed by assembling the segment pieces s.

The tip end of the screw conveyor 10 is connected to the bulkhead 6 at the rear end of the cutter chamber 7, and the base end side of the screw conveyor 10 extends rearward with a slight upward inclination. The screw conveyor 10 is slidably supported in the axial direction (generally in the front-rear direction) on a column 9 standing upright in the shield 2 at an approximately middle portion in the front-rear direction. Also, the screw conveyor 10
The belt conveyor 3 from below in the middle of the axial direction.
1 is arranged rearward and slightly upward. The belt conveyor 31 is supported by a support frame 8b extending rearward from the turning frame 8a of the erector 8.

As shown in FIG. 2, the screw conveyor 10 is rotatably mounted in a cylindrical conveyor housing 11 with a screw auger 12 protruding from a tip portion 12a. As shown in FIG. 7, the screw auger 12 has a shaft 12b that penetrates the central portion except for the rear end portion 12c, and is formed in a U-shaped cross section over the screw auger tip portion 12a and its slightly proximal end side. The wear-resistant metal material 13 that is continuous in series is screw 12d
Are fixed by welding along the spiral peripheral portion of.

As shown in FIG. 1, the screw conveyor 10 has an earth discharging port 14 opened on the lower surface of the conveyor housing 11 corresponding to the upper end of the belt conveyor 31 and a hydraulic jack 37 is provided to the earth discharging port 14. An opening / closing gate 15 for earth removal that slides in the axial direction is provided, and a pair of opening / closing gates 27 and 28 for opening and closing the inside of the conveyor housing 11 are formed in the axial direction in front of the opening of the earth discharging port 18 on the lower surface of the rearmost end. They are provided orthogonally. Two earth exits 14 and 18
Are selectively used depending on the situation of the face when excavating. That is, in the excavation work in the open state (when the mud pressure does not act on the cutter disk 3), the front soil discharge port 14 is used, and in the excavation work in which the mud pressure is acting on the cutter disk 3, the rear soil discharge port 18 is used. Is used.

As shown in FIGS. 2 and 3, the conveyor housing 11 has a front end portion 11 having an inner and outer double wall structure.
b and the conveyor housing main body 11a on the base end side thereof
It consists of and. The tip portion 11b is the outer peripheral wall 11
c and inner peripheral wall 11d, both peripheral walls 11c and 11d
Is relatively slidable, and in this example, the tip of the outer peripheral wall 11c is integrally connected to the periphery of the soil discharge port 6a opened at the lower portion of the bulkhead 6 by welding.

The rear end (base end) portion 11h of the conveyor housing main body 11a is bent downward in a "V" shape,
An outwardly facing flange 11e is integrally formed around the front end (tip). An outward flange 11f corresponding to the flange 11e is integrally formed around the base end of the inner peripheral wall 11d. As shown in FIG.
A large number of bolt holes penetrating in series in 11f are bored at intervals in the circumferential direction, and bolts 32 are passed through these bolt holes and tightened with nuts, whereby the inner peripheral wall 11d is formed.
Is detachably connected to the tip of the conveyor housing body 11a. An outwardly facing flange 11g is also integrally projectingly provided around the base end side of the outer peripheral wall 11c.

As shown in FIG. 4, a rotation ring 38 continuous in the circumferential direction is integrally rotatably connected to the rear end portion of the screw auger 12, and the rotation ring 38 is located near the base end of the conveyor housing body 11a. It is rotatably fitted in a ring-shaped opening (not shown) provided in the. A driven gear 38a is integrally projectingly provided on the outer peripheral surface of the rotating ring 38, and a hydraulic motor 36 is installed on the upper surface of the conveyor housing body 11a via the brackets 34 and 35 so as to straddle the rotating ring 38. 36 drive gears 3
6a is meshed with the driven gear 38a. With this structure, the screw auger 12 moves in the axial direction (front-back direction) integrally with the base end portion of the conveyor housing body 11a.

A part 16 of the main body of the conveyor housing 11a on the tip side of the hydraulic motor 36 has an inner-outer double wall structure, and an outer peripheral wall 16a and an inner peripheral wall 16b.
Both peripheral walls 16a and 16b are relatively slidable in the front-rear direction. In this example, the outer peripheral wall 16a is fixed at a fixed position of the main body 11a, and the inner peripheral wall 16b is a main body portion on the proximal end side ( It is connected to the hydraulic motor 36, the bending portion 11h, etc.) and slides integrally in the axial direction. In order to perform this sliding, a plurality of hydraulic jacks 17 are provided between the outer peripheral wall 16a and the rear end of the inner peripheral wall 16b with brackets 17c and 17d which are circumferentially spaced from each other.

As described above, the screw conveyor 11 is slidably supported on the support column 9.
A hydraulic jack 19 is interposed between the lower surface of the conveyor housing main body 11a and a substantially intermediate position in the axial direction, and by extending the jack 19 rearward, the conveyor housing main body 11a, the screw auger 12, the inner peripheral wall 11d.
Retreat together. In the hydraulic jack 19, the tip of a piston rod 19a is connected to the lower surface of the conveyor housing body 11a via a bracket 19b.

As shown in FIG. 2, the conveyor housing 1
A water stop gate 20 is provided at a tip portion 11b in 1 so as to be openable and closable. As shown in FIG. 8, the water stop gate 20 is arcuate in the longitudinal direction when viewed from the side, and the guide groove 21b of the water stop gate 20 is formed in an arcuate shape from the lower surface near the tip of the outer peripheral wall 11c upward and rearward. This horizontal opening 21 at the top
With the tip of the water stop gate 20 inserted from a, the water stop gate 20 is pushed downward to close the tip 11b in the conveyor housing 11.

That is, the guide groove 21b into which the water blocking gate 20 is inserted has an arcuate shape along both sides of the bag-shaped case body 21 having a horizontally elongated opening 21a at the upper end as shown in FIG. The seals (not shown) are provided so as to sandwich both sides of the water stop gate 20. The case body 21 is curved so as to draw an arc shape corresponding to the arc shape of the water shut off gate 20 when viewed from the side,
As shown in FIG. 9, the conveyor housing tip portion 1 is provided in the central portion.
An opening 21c corresponding to 1b (outer peripheral wall 11c) is provided, and the outer peripheral wall 11c is integrally welded so as to cut the tip position of the outer peripheral wall 11c in an arc shape from top to bottom in this example. When the water stop gate 20 is opened, the water stop gate 20 retreats upward and backward so as to draw an arc along the arc-shaped guide groove 21b, returns to the upper surface of the tip of the conveyor housing body 11a, and stands by.

Brackets 20a are provided so as to project upward on both sides of the base end (rear end) of the water stop gate 20, and opening / closing arms 2 are provided on the brackets 9a provided so as to project forward on both sides of the upper front surface of the support column 9.
The lower end of 2 is pivotally attached, and the upper end of the opening / closing arm 22 is pivotally attached to each bracket 20a of the water stop gate 20 by a support shaft 20b. The length of the opening / closing arm 22 is the water stop gate 2
When the opening / closing arm 22 swings and rotates in the front-rear direction, the water stop gate 20 is smoothly opened and closed along the guide groove 21b. In order to swing and rotate the opening / closing arm 22 forward, a hydraulic jack 23 is arranged along the axial direction on the upper surface of the tip of the conveyor housing body 11a.
The tip of 3a is connected to the support shaft 20b. With this configuration, by moving the piston rod 23a forward from the contracted state, the opening / closing arm 22 rotates forward and the water stop gate 20 closes the tip end position in the conveyor housing 11.

From the front side of the support column 9, the hydraulic jack 24
The semi-cylindrical hopper 24b, which is connected to the tip of the piston rod 24a and has the upper end opened, penetrates the bulkhead 6 and projects into the cutter chamber 7. In the method of excavating without applying a pressure), the hopper 24b is located below the tip of the screw auger 12 as shown in FIG. On the other hand, in the mud pressure type construction method (the method of excavating while the mud pressure is applied to the cutter disk 3), the hopper 24b is moved back and forth to the vicinity of the bulkhead 6 in the cutter chamber 7 as shown in FIG. The earth and sand in the cutter chamber 7 can be smoothly and efficiently discharged through the conveyor housing 11 by the screw auger 12 having a small protruding amount.

A peep window 25 for internal inspection is appropriately opened at the tip portion 11b (inner and outer peripheral walls 11c and 11d) of the conveyor housing 11 and the rear portion (main body 11a) thereof, and a transparent reinforced plastic plate or It is sealed with a removable steel plate lid. In addition, it is desirable to provide a peep window 25 on the inner and outer peripheral walls 11c and 11d so that the inner peripheral wall 11d communicates at the frontmost position.

The shield machine 1 according to the embodiment of the present invention is constructed as described above. The screw conveyor 10 of the shield machine 1 continuously discharges the earth and sand taken into the cutter chamber 7 during the excavation. However, the soil discharging mode and the maintenance of the screw conveyor 10 will be described in detail below.

The screw conveyor 10 has a large diameter and a large size is used in accordance with the increase in the excavation speed. The screw auger 12 is rotated at a high speed by the hydraulic motor 15 and is excavated by the cutter disk 3 into the cutter chamber 7. The earth and sand taken in is conveyor housing 1
It is discharged through the inside of 1. As mentioned above, the open construction method and the mud pressure construction method are selected depending on the condition of the ground.
In the case of the open construction method, the tip portion 12a of the screw auger 12 is attached to the cutter chamber 7 as shown in FIGS.
The hopper 24b is also projected to the maximum extent, and the excavated earth and sand are received on the hopper 24b to rotate the screw auger 12 to convey the conveyor housing 11.
It is conveyed backward through the inside and discharged from the front soil discharge port 14 onto the belt conveyor 31.

In the case of the mud pressure construction method, as shown in FIG. 3, the hydraulic jack 17 is extended and the inner peripheral wall 16b is retracted with respect to the outer peripheral wall 16a, thereby extending the conveyor housing main body 11a to extend the screw auger 12. The tip portion 12a of the screw is retracted in the cutter chamber 7 and the hopper 24b is also retracted by the jack 24, and the screw auger 12 is rotated to convey the backward portion through the inside of the conveyor housing 11.
It is discharged onto the belt conveyor 31 from No. 8 and further discharged to the rear on the belt conveyor 31.

At the tip portion of the screw auger 12, as shown in FIG. 7, a wear resistant metal material 13 is attached to improve wear resistance, but it is regularly inspected and repaired if necessary. Or the inner wall must be replaced. At the time of inspection or repair, it is necessary to close the tip end position in the conveyor housing 11 with the water stop gate 20. Further, when the front end position of the conveyor housing 11 is closed by the water stop gate 20, the front end portion 12 of the screw auger 12 protruding into the cutter chamber 7
It is necessary to pull a a rearward of the position where it is closed by the water stop gate 20 so as not to interfere with the water stop gate 20. That is, as shown in FIG. 4, in the case of this example, the hydraulic jack has a relationship between the protrusion amount (dimension) of the tip portion of the screw auger 12 in the cutter chamber 7 and the retreat distance of the conveyor housing body 11 a from the support column 9. 17 of the conveyor housing body 11a to the maximum extent, and a part 16 of the conveyor housing main body 11a near the base end portion is provided with an inner peripheral wall 16 with respect to an outer peripheral wall 16a.
b is retracted together with the base end side portion, and the conveyor housing main body 11a is extended to retract the screw auger 12, and the hydraulic jack 19 is extended rearward by the first stage so that the conveyor housing main body 11a is located inside the support column 9. It is retracted together with the peripheral wall 11d and the screw auger 12. By these operations, the tip portion 12a of the screw auger 12 is drawn into the conveyor housing 11 from the inside of the cutter chamber 7, so that the water stop gate 20 can be closed.

However, when the distance that the conveyor housing body 11a can be retracted with respect to the support column 9 is very large compared to the distance required to retract the tip of the screw auger 12 from the position where it is closed by the water blocking gate 20. Even if the hydraulic jack 17 is not extended rearward, the water stop gate 20 can be closed by extending only the conveyor housing body 11a by the hydraulic jack 19 and retracting the first stage. 10 and 11 show an embodiment of the screw conveyor 10 'corresponding to the latter case, but in this embodiment, the water stop gate 20 can be closed without extending the hydraulic jack 17. 10 corresponds to FIG. 4, and FIG. 11 corresponds to FIG.

As shown in FIG. 4, by extending the hydraulic jack 23 and swinging and rotating the opening / closing arm 22 forward, the arc-shaped water stop gate 20 on the tip of the conveyor housing 11 moves forward along the guide groove 21b. Move downwards,
The tip position in the conveyor housing 11 is closed. In this state, if the screw auger 12 is rotated to discharge the earth and sand in the conveyor housing 11, the inside of the peep window 25, especially the state of the tip portion 12a of the screw auger 12 and the abrasion state of the wear-resistant metal material 13 Can be visually inspected. If there are no abnormalities in the inspection, the procedure may be reversed to return to the original state. However, if there is an abnormality or more detailed inspection is required, the following should be done. That is, as shown in FIG. 5, the hydraulic jack 19 is extended rearward to the maximum (second stage), and the conveyor housing main body 11 a is attached to the support column 9 by the inner peripheral wall 11 d and the screw auger 1.
Retreat with 2. As a result, the inner peripheral wall 11d is further retracted from the rear end of the outer peripheral wall 11c, and the outer peripheral wall 11d
c and the inner peripheral wall 11d are separated from each other, and the tip portion of the screw auger 12 is exposed. Therefore, the state of the tip portion 12a of the screw auger 12 can be directly visually inspected, and can also be inspected by touching it by hand. In this state, if the wear-resistant metal material 13 is damaged, only the damaged portion can be removed and a new wear-resistant metal material 13 can be attached by welding. Also, the inner peripheral wall 11
When it is time to replace the inner peripheral surface of d due to wear, the inner peripheral wall 11d can be replaced with a new one by removing the bolt 32 between the flanges 11e and 11f.

The hydraulic jack 23 for opening and closing the water stop gate 20 can be further retracted as shown in FIGS. 4 and 5 with the hydraulic jack 23 extended and the water stop gate 20 closed. Therefore, in this example, the body portion of the hydraulic jack 23 (the portion excluding the piston rod 23a) is fixed inside the shield 2 such as the bulkhead 6 so that the hydraulic jack 23 can move in the front-rear direction with respect to the conveyor housing body 11a. Supported by the department. However, for example, the piston rod 23 of the hydraulic jack 23
Do not connect the tip of a to the spindle 20b of the water stop gate 20,
When the support shaft 20b of the water stop gate 20 is pushed and closed by the hydraulic jack 23 by simply abutting it, the support shaft 20
The tip of the hydraulic jack 23 can be separated from b,
When opening the water stop gate 20, the piston rod 23a
The tip of may be connected to the support shaft 20b of the water stop gate 20.

Although one embodiment has been introduced above, the present invention can also be carried out as follows.

A) When the screw conveyor 10 performs only mud pressure type rearward, it is not necessary to provide a double wall structure at each of the front end portion and the base end portion of the conveyor housing 11 as in the above embodiment. Alternatively, the structure may be simplified by forming a double wall structure only at the tip of the conveyor housing 11.

B) The water stop gate 20 and its opening / closing hydraulic jack 23 are arranged on one side surface instead of the upper surface of the conveyor housing 11, and the vicinity of the tip end of the conveyor housing 11 is formed in an arc shape from one side surface to the other side surface. It can also be opened and closed to cross.

C) In the above embodiment, the screw auger 1
The rear end (base end) side of the screw auger 12 is moved toward the conveyor housing main body 1 in order to draw the front end portion 12a of the screw 2 from the cutter chamber 7 into the conveyor housing 11.
Conveyor housing body 11a integrated with the base end side of 1a
However, the screw auger 12 may be installed in the conveyor housing 11 so as to be movable back and forth in the axial direction, and the screw auger 12 may be retracted with respect to the conveyor housing 11.

D) In the above embodiment, it is assumed that there is no space in the vicinity of the tip of the screw conveyor 10 in the shield 2 by increasing the excavation speed, but regardless of the presence or absence of space. It goes without saying that it can be carried out, and also the conveyor housing body 11a
The support column 9 for supporting the above is not limited to the one standing upright from below, but may be a support frame type horizontally disposed in the shield 2.

[0057]

The screw conveyor of the shield machine according to the present invention has the following effects.

1) Like a conventional water shutoff gate that is driven to open and close in a direction orthogonal to the axial direction of the screw conveyor,
Since it is not necessary to secure the space required for opening and closing the water stop gate in the direction orthogonal to the tip of the screw conveyor,
Even if there is not enough space behind the bulkhead, a water shut-off gate can be installed and opened as long as a small space along the axial direction can be secured in a part of the periphery of the screw conveyor housing.

2) Since the tip portion of the screw auger can be drawn into the conveyor housing, it is not necessary to change the structure of the water stop gate or the screw auger to a complicated structure capable of intersecting.

3) By bending the water stop gate in an arc shape in the longitudinal direction, if the water stop gate is moved in the axial direction of the screw conveyor, the inside of the conveyor housing can be closed or released from the closed state. The action to be performed can be performed smoothly.

In the screw conveyor according to claim 2, further, 4) the main body of the conveyor housing except the tip portion and the screw auger are attached to the columns so as to be movable back and forth in the front-rear direction. By retracting the housing body, the screw auger is retracted, and at the same time, one peripheral wall of the conveyor housing tip portion connected to the main body is retracted with respect to the other peripheral wall (fixed to the bulkhead), so that the protruding portion of the screw auger is The water shut-off gate can be closed at the tip of the conveyor housing by being drawn into the housing from the cutter chamber. With this structure, when the conveyor housing main body is further retracted, one peripheral wall of the conveyor housing tip portion is retracted rearward from the rear end of the other peripheral wall, and the tip portion of the screw auger is exposed. The tip can be easily repaired or replaced.

5) In the screw conveyor according to claim 3, 5) a part of the main body of the conveyor housing including the drive motor of the screw auger is moved forwards and backwards (extends and contracts) together with the screw auger with respect to the front part. By doing so, the open construction method and the mud pressure construction method can be appropriately selected according to the situation of the ground, and the mud in the cutter chamber can be efficiently discharged.

Further, as described above with respect to the screw conveyor according to claim 2, in the state where the conveyor housing body is further retracted to expose the tip portion of the screw auger, the tip portion of the screw auger is largely exposed or the conveyor housing body is exposed. Since it can be pulled in, it becomes easy to inspect and replace the tip of the screw auger.

6) The screw conveyor according to claim 4, further comprising: 6) When excavating by the open construction method, the hopper is projected below the tip portion of the screw auger projecting into the cutter chamber, so that the mud soil taken into the cutter chamber. It can be smoothly discharged through the inside of the conveyor housing at the tip of the screw auger that receives and rotates the hopper.

The screw conveyor according to claim 5 is further characterized in that 7) the tip portion of the screw auger is more easily worn than other portions, but wear is caused by fixing a wear resistant metal material to the peripheral edge of the screw. It becomes harder to do and durability improves,
The life is extended. Further, when the wear resistant metal material is worn out, only the wear resistant metal material can be replaced.

The screw conveyor according to claim 6 is further provided with: 8) the tip portion of the screw auger is drawn into the conveyor housing from the inside of the cutter chamber, the water blocking gate is closed, and the peripheral wall integrally connected to the conveyor housing main body is made into a bulk. In the state of retreating to the peripheral wall fixed to the head,
The wear state can be checked by looking into the tip of the screw auger of the housing through the viewing window. Especially, since the tip of the screw auger need not be exposed from the conveyor housing, the check can be performed easily and in a short time.

Further, in the screw conveyor according to claim 7, 9) even if the peripheral wall connected to the tip of the conveyor housing body is worn, the peripheral wall is removed from the tip of the conveyor housing body by removing the bolt, It can be easily replaced with a new wall.

10) The screw conveyor according to claim 8 further comprises: 10) Since the water stop gate is moved through an opening / closing arm that swings in the front-rear direction, even if the jack is moved linearly, the water stop gate opens and closes the arm. It can be opened and closed smoothly via.
Further, for example, when the conveyor housing main body is retracted as described in claim 2, the jack main body moves with respect to the conveyor housing main body even if the jack for opening and closing the water shutoff gate is in the maximum extension state. No excessive force is applied to the jack.

[Brief description of drawings]

FIG. 1 is a screw conveyor 1 as an embodiment of the present invention.
It is a side view sectional view showing shield machine 1 provided with 0.

FIG. 2 is a side cross-sectional view showing a slightly enlarged view of a screw conveyor 10, a bulkhead 6 and the like showing an earth discharging state by an open method in the shield machine 1 of FIG.

FIG. 3 is a side cross-sectional view showing a slightly enlarged view of a screw conveyor 10, a bulkhead 6 and the like showing an earth discharging state by the mud pressure method in the shield machine 1 of FIG.

FIG. 4 is a cross-sectional side view showing a state in which the inside of the tip portion of the screw conveyor 10 is inspected in the shield machine 1 of FIG. 1.

5 is a side cross-sectional view showing a state in which the tip portion of the screw auger 12 in the screw conveyor 10 is inspected and repaired in the shield machine 1 of FIG.

FIG. 6 is an enlarged cross-sectional side view showing the tip portion of the screw conveyor 10 in FIG. 1, showing the outer peripheral wall in phantom lines.

7 is a front view generally showing a screw auger 12 of the screw conveyor 10 of FIG. 1 and a sectional view showing an enlarged peripheral portion of the screw.

8 is an enlarged side view showing a state in which a water blocking gate 20 is closed at a conveyor housing tip portion 11b of the screw conveyor 10 of FIG. 1. FIG.

FIG. 9 is an enlarged front view showing the water stop gate 20 and the case body 21.

FIG. 10 is a side sectional view showing a screw conveyor 10 ′ according to another embodiment of the present invention, which corresponds to FIG.

FIG. 11 is a side sectional view showing a screw conveyor 10 ′ according to another embodiment of the present invention, which corresponds to FIG.

[Explanation of symbols]

1 shield machine 2 shield 3 cutter disk 6 bulkhead 7 Cutter chamber 8 Erector 9 props 10.10 'screw conveyor 11 Conveyor housing 11a Conveyor housing body 11b Tip of conveyor housing 11 11c Outer peripheral wall 11d inner peripheral wall 12 screw auger 16a outer peripheral wall 16b inner peripheral wall 17, 19, 23, 24 hydraulic jack 20 Water stop gate 21 case body 22 Opening / closing arm 24c hopper 25 Peep window

Continuation of the front page (56) Reference JP 62-129499 (JP, A) JP 62-137400 (JP, A) JP 7-197784 (JP, A) Actual development Sho 56-150298 (JP , U) Furukaihei 3-122196 (JP, U) Furukaisho 59-111900 (JP, U) Furukaihei 4-46188 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB) Name) E21D 9/12

Claims (8)

(57) [Claims] 1. A shield machine which takes in earth and sand excavated by a cutter disk provided at a tip into a cutter chamber and excavates a tunnel while discharging the soil by a screw conveyor, wherein a tip of a conveyor housing of the screw conveyor is formed by the cutter. Connected to the bulkhead behind the chamber, the tip of the screw auger is projected into the cutter chamber, and the tip of the screw auger can be drawn into the conveyor housing. A water stop gate curved in an arc shape in the longitudinal direction. Is arranged in the axial direction of the conveyor housing, and the vicinity of the tip end in the conveyor housing can be opened and closed by a driving device such as a jack which is also arranged in the axial direction, and the screw conveyor of the shield machine. 2. The conveyor housing main body is attached to a support provided in the shield machine near its tip end so as to be movable back and forth in the axial direction via a jack, and the tip end portion of the conveyor housing has a double wall structure. And relatively slidably in the axial direction, the tip of one of the peripheral walls is fixed to the bulkhead, and the base end of the other peripheral wall is connected to the tip of the conveyor housing body to form the pillar. On the other hand, the screw conveyor of the shield machine according to claim 1, wherein the conveyor housing main body and the screw auger are configured to be retractable. 3. A base end of the screw auger is connected to a drive motor installed on a base end of the conveyor housing body, and the screw auger and the conveyor housing body are integrally formed on the base end side thereof. A part of the conveyor housing main body has a double wall structure on the tip side of the drive motor, and the other peripheral wall is slidable in the axial direction with respect to the one peripheral wall, and the other slidable peripheral wall is provided. 3. A screw conveyor for a shield machine according to claim 1, wherein said screw conveyor is configured to be capable of retracting together with one end wall of the conveyor housing main body including the drive motor installation position and the screw auger with respect to one of the peripheral walls via a jack. 4. The semi-cylindrical hopper having an open upper end is projected below the tip portion of the screw auger projecting into the cutter chamber so as to be retractable through the bulkhead. The screw conveyor of the shield machine described in Crab. 5. The screw conveyor for a shield machine according to claim 1, wherein a wear-resistant metal material is fixed in a spiral shape along a peripheral edge portion of the screw at a tip end portion of the screw auger. 6. The screw conveyor of a shield machine according to claim 2, wherein a hermetically-sealed peep window is provided on the peripheral wall of the conveyor housing leading end portion connected to the conveyor housing body. 7. An outwardly facing flange is integrally formed around the base end of one peripheral wall of the conveyor housing tip end portion connected to the conveyor housing body and around the tip end of the conveyor housing body, respectively.
A plurality of bolt holes are formed in the circumferential direction of both flanges at intervals and penetrate the flange holes, and the flange at the base end of the peripheral wall is detachably connected to the flange at the tip of the conveyor housing body through bolts. The screw conveyor of the shield machine according to any one of 2 to 6. 8. A base end of the water stop gate is pivotally connected to an upper end of an opening / closing arm that is pivotally supported by the support column at a lower end thereof and is swingable in a front-rear direction, and a water stop is provided at an upper end of the opening / closing arm. The piston rod tip of a jack for opening and closing a gate is connected, the jack body is axially arranged on the upper surface of the conveyor housing body, and is supported by a fixed supported portion in a shield such as the bulkhead. A screw conveyor for a shield machine according to any one of to 7.