JP4938704B2 - Anti-rolling mechanism in the folding shield excavator - Google Patents

Description

  The present invention relates to a mechanism for preventing the occurrence of rolling during excavation in a folded shield excavator capable of excavating a curved tunnel.

  A shield excavator for excavating a curved tunnel is divided into two parts: a front cylinder having a cutter head disposed in a front end opening and a rear cylinder having a segment assembly erector disposed therein. The opposite ends of the front and rear cylinders are joined to each other in a refractive manner, and the inner peripheral surfaces of the front and rear cylinders are connected by a plurality of middle-folding jacks arranged at predetermined intervals in the circumferential direction. Then, while rotating the cutter head, the plurality of propulsion jacks mounted on the inner peripheral surface of the rear cylinder are extended to dig the tunnel, and when the curved tunnel is excavated, the middle folding jack is operated to On the other hand, the front barrel side is refracted by a predetermined angle in the direction of digging.

  At this time, when the upper and lower portions at the opposite ends of the front and rear cylinders are connected to each other by a vertical pin so that they can be bent in the left and right directions, the front cylinder rolls in the circumferential direction with respect to the rear cylinder. In this configuration, when the curved tunnel is excavated, the front cylinder is extended with respect to the rear cylinder centering on the pin, for example, the middle bent jack disposed on the left side in the machine is extended to the right. When the angle is refracted by a predetermined angle, the bent jack arranged on the right side must be contracted by the same amount according to the extension amount. The rear end portion of the cylinder is greatly retracted toward the rear cylinder side, and a space part having a length capable of allowing the retreat distance is required between the front cylinder and the rear cylinder, and the total length of the shield excavator Formed longer than that There is a problem that must be placed.

  In order to solve such a problem, the front and rear cylinders are connected to each other without bending the upper and lower portions at the joint end portion between the front and rear cylinders by a pin, for example, as described in Patent Document 1. In the multiple middle-folded jacks that connect the rear barrel to the rear barrel, when the middle-folded jack arranged on either the left or right side is extended, the mounting portion of the other middle-folded jack is used as a fulcrum On the other hand, the front cylinder is configured to be refracted so that the distance at which the other bent jack at the rear end portion of the front cylinder is set back is reduced toward the rear cylinder side.

  And in order to exhibit such an action, as a rolling prevention mechanism, means for connecting the upper and lower parts on the vertical line perpendicular to the axis at the joint end part of the front trunk and the rear trunk as described above by pins. Since it can not be adopted, on the left and right sides at the opposite ends where the front and rear cylinders are bent together, one horizontal plate protrudes from both sides of the inner circumferential surface of either cylinder, A rolling prevention mechanism is adopted in which a pair of upper and lower horizontal seating members made of a horizontal plate are provided so as to sandwich the horizontal plate from above and below on both sides of the inner peripheral surface of the other body.

JP-A-8-246788

  However, according to the rolling prevention mechanism as described above, one horizontal plate and a pair of upper and lower horizontal seating members sandwiching the horizontal plate are provided radially on both sides of the inner peripheral surface of the front and rear cylinders. When projecting a sharply curved tunnel, if the front trunk is greatly refracted with respect to the rear trunk, the horizontal plate interposed between the horizontal seat members will be in the in-machine direction relative to the horizontal seat member. There is a possibility that at least part of the horizontal seating member moves and protrudes toward the inside of the machine from the horizontal seating member to obstruct the equipment in the machine, and the reliable rolling prevention action is impaired.

  Furthermore, the rolling preventing action is performed by causing the horizontal seat member to receive the flat plate surface of the horizontal plate, so that the bending strength against pressure when contacting each other is weak and the horizontal plate is in the thickness direction. Bending deformation is likely to occur, and in order to eliminate this, there is a problem that the thickness must be increased or widened, the mechanism becomes larger, the cost is increased, and the working space is reduced.

  The present invention has been made in view of such problems, and the object of the present invention is to make it compact so as not to hinder the on-board equipment, and to reliably and firmly prevent the occurrence of rolling. It is an object of the present invention to provide a rolling prevention mechanism in a folding shield excavator capable of performing the above.

In order to achieve the above object, the rolling prevention mechanism in the middle-folded shield excavator of the present invention has a cylindrical shield body with a cutter head disposed at the front end as described in claim 1. The front and rear cylinders are divided into a trunk and a rear cylinder, and the front and rear cylinders are connected to each other in a left-right direction by a plurality of middle-folding jacks arranged at predetermined intervals in the circumferential direction. In the folding shield excavator provided with an anti-rolling mechanism at the opposite end portions that are refractively joined to each other and the rear torso, the anti-rolling mechanism is provided on one of the front and rear cylinders. The upper and lower horizontal fixed plates made of a flat rectangular steel plate projecting from the upper and lower parts on the vertical line on the peripheral surface toward the inner peripheral surface of the other cylinder, and the upper and lower inner peripheral surfaces of the other cylinder Both ends of the top and bottom horizontal fixing plate Respectively so as to sandwich the right and left consists of a pair of left and right seat member fixed to exist a small distance from the both side end face, forms a facing end surface of the seat member to the vertical end face of the flat mountain shape or a convex arcuate It is characterized by that.

The invention according to claim 2 divides a cylindrical shield body having a cutter head at the front end portion into a front body and a rear body, and the front body and the rear body are predetermined in the circumferential direction. A plurality of middle folding jacks arranged at intervals are connected to each other in a refractive manner in the left-right direction, and a rolling prevention mechanism is provided at the opposite end portions of the front and rear cylinders that are refractably joined to each other. In the middle-folded shield excavator, the rolling prevention mechanism protrudes from the upper and lower portions of the inner peripheral surface of one of the front and rear cylinders toward the inner peripheral surface of the other cylinder. A pair of left and right receiving seats fixed to the upper and lower horizontal fixing plates and the upper and lower inner peripheral surfaces of the other body, with both end surfaces on both ends of the upper and lower horizontal fixing plates being sandwiched from the left and right sides with a small gap therebetween. together comprising a member, the horizontal fixing plate In accordance with a predetermined refraction angle in the left and right direction of the front trunk relative to the rear trunk when excavating the curved tunnel part, the direction is changed and moved on the base fixed to the inner peripheral surface of the curved tunnel portion. It is characterized by comprising.

  According to the first aspect of the present invention, as a rolling prevention mechanism in the folding shield excavator, one of the front cylinder and the rear cylinder of the shield main body that are refractably connected to each other in the left-right direction. The upper and lower horizontal fixing plates projecting from the upper and lower parts of the peripheral surface toward the inner peripheral surface of the other cylinder, and the end surfaces on both ends of the upper and lower horizontal fixing plates on the upper and lower inner peripheral surfaces of the other cylinder, respectively. Since it is composed of a pair of left and right seat members fixed with a small interval allowing the horizontal fixing plate to tilt in the left-right direction from both side end faces so as to be sandwiched from the left and right, When the front cylinder is refracted in the left-right direction with respect to the cylinder, the horizontal fixing plate and the pair of left and right seat members are refracted relative to each other in the circumferential direction and do not move in the inner diameter direction. Will cause any adverse effects on in-flight equipment. Since the curved tunnel can be smoothly dug without crushing, the height of the pair of left and right seat members should be set to a height that can receive the side end face of the horizontal fixing plate. In addition to being able to make the overall height of the apparatus compact, the working space in the machine can be widened.

  Further, when the front and rear cylinders are to be rolled due to a load during excavation, the side end surfaces of the horizontal fixing plate projecting toward the other cylinder on the upper and lower parts of the inner peripheral surface of one cylinder The occurrence of rolling can be prevented by immediately contacting and receiving either one of the pair of left and right seat members protruding from the upper and lower portions of the inner peripheral surface of the other body. At that time, since the rolling is suppressed by the contact between the side end surface of the horizontal fixing plate and the vertical surface of the seating member, the horizontal fixing plate is reliably and with a large second moment of inertia without causing bending deformation and the like. A deterrent against occurrence of rolling can be exerted firmly.

Further, according to the present invention, the opposing end surfaces of the pair of left and right receiving members facing the end surfaces on both sides of the front end portion of the horizontal fixing plate with a small interval are formed into vertical end surfaces having a planar mountain shape or a convex arc shape. Since it is formed, the side end face at the front end portion of the horizontal fixing plate provided on either the front cylinder or the rear cylinder is placed on the other cylinder facing the side end face with a small gap. Rolling can be reliably prevented by abutting and receiving the opposing end surface of the seat member provided, and of course, when constructing a curved tunnel, the front torso is left and right with respect to the rear torso. When refracted, the horizontal fixing plate is large in the left-right direction without being obstructed by the seat member along the vertical end surface of the seat member facing the side end surface of the seat member or the convex arcuate shape. It can be tilted smoothly and has a predetermined curve ton It can be accurately excavation Le.

Further , according to the invention according to claim 2 , on the pedestal fixed with the horizontal fixing plate to the inner peripheral surface of the trunk, according to the left and right refraction angle of the front trunk with respect to the rear trunk at the time of excavation of the curved tunnel portion, Since it is configured to be moved and fixed with its direction changed by the same angle, the right and left seat members are used when excavating a curved tunnel by refracting the front to the left and right with respect to the back. When the horizontal fixing plate arranged in between is tilted relative to the seat member in the left-right direction, and the end faces on both sides collide with the opposing surfaces of the left and right seat members, making it impossible to tilt further. In this case, it is possible to easily dig a curved tunnel having a predetermined degree of curvature by removing the horizontal fixing plate from the pedestal and fixing it again on the pedestal in a state in which the orientation is directed to the digging direction. And by moving the horizontal fixing plate Both side end surfaces of the front end of the horizontal fixing plate can be arranged in parallel to the opposing end surface of the seating member, and the side end surface of the horizontal fixing plate is accurately received by the surface of the seating member facing this side end surface. Thus, the occurrence of rolling can be reliably and firmly prevented.

  Next, a specific embodiment of the present invention will be described with reference to the drawings. In FIGS. 1 and 2, reference numeral 1 denotes a cylindrical shield body of a shield excavator, and a cutter head 11 is installed at the front end opening of the shield body 1. A front barrel 2 that is rotatably disposed, and a plurality of propulsion jacks 12 are disposed in the circumferential direction at desired intervals and a segment assembly erector 13 and the like are disposed in the rear end portion. The outer circumferential surface of the rear barrel 3 is formed into a convex arcuate curved surface 4 and the convex arcuate curved surface 4 is slid onto the inner circumferential surface of the rear end of the front barrel 2 via a packing 14. The front cylinder 2 and the rear cylinder 3 are joined so as to be able to be bent. The front end portion of the rear barrel 3 is formed by fixing a short cylindrical end member 3a to the inner peripheral surface of the front end of the rear barrel 3 and projecting forward, and on the outer peripheral surface of the end member 3a. The convex arcuate curved surface 4 is formed.

  Further, in the joint portion between the front barrel 2 and the rear barrel 3, the bent jacks 5 are arranged in the front and rear direction at four locations on the left and right upper and lower portions on the circle of the same radius from the center of the shield body 1. While the front end portion of the middle folded jack 5 is pivotally attached to the inner peripheral surface of the front barrel 2, the rear end portion, that is, the front end portion of the telescopic rod of the middle folded jack 5 is connected to the inner portion of the rear barrel 3. The front cylinder 2 and the rear cylinder 3 are connected to each other by pivoting around the circumferential surface by means of these middle folding jacks 5. Then, when a pair of upper and lower middle folding jacks 5 and 5 arranged on the left side and a pair of upper and lower middle folding jacks 5 and 5 arranged on the right side are extended, a pair of upper and lower middle folding jacks are extended. The front cylinder 2 is configured to bend in the left-right direction with respect to the rear cylinder 3 with a pivoting portion on the joint portion side of the front and rear cylinders 2 and 3 in the pair of upper and lower middle folding jacks on the other side.

  Further, rolling prevention is provided at the upper and lower portions of the joint where the rear end portion of the front barrel 2 and the front end portion of the rear barrel 3 are refractorably joined to each other, that is, on the vertical line perpendicular to the machine axis. A mechanism is provided. This rolling prevention mechanism includes a horizontal fixing plate 6 mounted on the front barrel 2 side, and a pair of left and right seat members 7, 7 mounted on the rear barrel 3 side so that the front end portion of the horizontal fixing plate 6 is sandwiched from both the left and right sides. Consists of.

  Specifically, as shown in FIGS. 3 and 4, the horizontal fixing plate 6 is made of a flat rectangular flat steel plate having a certain width, a certain length, and a certain thickness, and the horizontal fixing plates 6, 6 are connected to the front cylinder 2. The base end portion is arranged on the upper and lower portions of the inner peripheral surface of the rear end portion, with its length direction directed to the length direction of the shield body 1 and the width direction directed to the circumferential direction of the shield body 1. An end member 3a having a short cylindrical shape is fixed on the support member 26 fixed to the upper and lower portions of the inner peripheral surface of the rear end portion, and the tip end portion is provided with the convex arcuate curved surface 4 on the outer peripheral surface of the front end portion of the rear barrel 3. The outer surface of the tip end portion is made to approach the inner surface of the end member 3a with a small gap.

On the other hand, a pair of left and right seat members 7 is made steel vertical plate secured to the upper and lower portions of the inner peripheral surface of the front end member 3a of the rear body 3, seat member made of a rectangular steel plate 7A, 7A and is bent flat mountain shape resides small spacing 8,8 on both sides at the front end of the horizontal fixing plate 6 that secures the vertical bend top 7a1, 7a1 to the front torso 2 side Te fixed with opposed state so as to sandwich the tip portion, Ri bent top 7a1 in the center is formed in the inclined plate portion 7a2, 7a2 inclined away the front and rear horizontal fixed plate 6 Thea, horizontal horizontal fixed opposite the tip portion of the fixing plate 6 in a vertical plane of the seat member 7 and the seat member 7 while permitting tilting of up to a predetermined angle in the horizontal direction between the seat members 7 of these right and left Rolling is prevented from occurring by abutting against one end surface of the front end of the plate 6.

  As is well known, the shield excavator provided with the rolling prevention mechanism has a motor 16 as a rotational drive means for the cutter head 11 mounted on the back surface of the partition wall 15 provided in the front end portion of the front barrel 2. The earth and sand in the excavation earth and sand taking-in chamber 17 formed between the cutter head 11 and the partition wall 15 is discharged backward from the machine by the earth and sand discharging means 18 such as a mud pipe or a screw conveyor. The segment 19 is assembled by the above-mentioned erector 13 in the rear trunk 3.

  Next, the operation of the anti-rolling mechanism in the folding shield excavator constructed as described above will be described. During the tunnel excavation, the front cylinder 2 is the axle relative to the rear cylinder 3 due to excavation load or the like by the cutter head 11. When rolling around, the horizontal fixing plates 6, 6 fixed to the upper and lower portions of the inner peripheral surface of the rear end of the front cylinder 2 are extremely equivalent to the interval of the small gap portion 8 integrally with the front cylinder 2. When moved in the circumferential direction by a small distance, the side end face of the horizontal fixing plate 6 facing the moving direction comes into contact with and is received by the vertical face of the seat member 7 facing the side end face. The occurrence of rolling can be prevented.

Furthermore, when excavating a curved tunnel in either the left or right direction, the pair of upper and lower middle folding jacks 5, 5 disposed on either the left or right side is deactivated and the other pair of upper and lower middle folding jacks 5, 5 is extended, the front cylinder 2 is refracted with respect to the rear cylinder 3 on one of the upper and lower bent jacks 5 and 5 with the pivoting portion on the joint side of the front and rear cylinders 2 and 3 as a fulcrum. As indicated by the two-dot chain line, the both end surfaces of the tip end portion are tilted integrally in the same circumferential direction along the bent top portions 7a1 and 7a1 of the receiving members 7A and 7A. At this time, since the front and rear portions of the receiving members 7A and 7A are formed as inclined plate portions 7a2 and 7a2 inclined in a direction away from the horizontal fixing plate 6, both end surfaces of the front end portion of the horizontal fixing plate 6 are inclined plate portions. 7a2 and 7a2 can be largely refracted without abutting, and a desired sharp curve tunnel nail can be excavated smoothly.

Moreover, to further increase the refractive angle of the front torso 2 against the rear body 3 to allow the drilling of the steep curve the tunnel, as shown in FIG. 6 in the vertical portion before the rear end portion inner peripheral surface of the cylinder 2, A pedestal 20 that can be moved and fixed in a state in which the horizontal fixing plate 6 is changed is fixed. The pedestal 20 has a central fixing seat 21 for fixing the base (front part) of the horizontal fixing plate 6 with the horizontal fixing plate 6 directed in the axial direction, and left and right sides of the central fixing seat 21. Both side inclined fixed seat portions 22 and 23 are provided which are inclined in a direction away from the central fixed seat portion 21 from the rear end toward the front end.

  Specifically, a plurality of bolt mounting holes 24 are provided at the base of the horizontal fixing plate 6, while a plurality of bolts of the horizontal fixing plate 6 are provided at the central fixing seat portion 21 and the side inclined fixing seat portions 22, 23. A plurality of screw holes 25 corresponding to the mounting holes 24 are provided, and at the time of straight tunnel excavation, the horizontal fixing plate 6 is directed in the axial direction, and the front end portion thereof is fixed to the upper and lower portions of the inner peripheral surface of the front end portion of the rear barrel 3. The base portion is placed on the center fixed seat portion 21 of the pedestal 20 in a state of being interposed between the pair of left and right receiving members 7, 7, and the bolts 26 are screwed into the screw holes 25 from the bolt mounting holes 24. To fix.

  Further, when excavating a curved tunnel curved in either the left or right direction, the front torso is operated by operating the above-mentioned bent jacks 5 and 5 with the horizontal fixing plate 6 removed from the central fixing seat 21 once. 2 is refracted by a predetermined angle in a predetermined direction, and then, the horizontal fixing plate 6 is moved to the inclined fixed seat portion 22 or 23 facing the pair of left and right receiving members 7, 7 as shown in FIGS. As shown in the figure, the front end portion is interposed between the receiving members 7 and 7 and fixed with bolts 26 in the same manner as described above, and in this state, the tunnel excavator is driven to dig a sharp curve tunnel. It is. At this time, occurrence of rolling during excavation can be prevented by allowing the receiving members 7 and 7 to receive the side end surfaces of the horizontal fixing plate 6, and the opposing surfaces of the receiving members 7 and 7 and the horizontal fixing plate The degree of curvature of the sharp tunnel can be adjusted by the presence of the small gap portions 8 between the both side end faces of 6.

FIG. 9 shows a modification of the rolling prevention mechanism shown in FIG. 3, wherein the seat members 7B and 7B are made of rectangular steel plates having a constant height and a constant thickness, and the opposing side end faces are formed as planar convex arcs. Are formed on the vertical end faces 7b and 7b. And the front-end | tip of the said horizontal fixing plate 6 which has fixed this seat member 7B, 7B to the front trunk | drum 2 side with the front and back facing the front-back direction, and opposing perpendicular | vertical arcuate side end surface 7b, 7b These are fixed to the upper and lower portions on the inner peripheral surface of the front end portion of the rear barrel 3 in a state of being opposed so as to sandwich the front end portion with small intervals 8 and 8 on both sides of the portion.

  Since it comprised in this way, when excavating a curved tunnel in either the left or right direction, the pair of upper and lower middle folding jacks 5, 5 disposed on either the left or right side are deactivated and the other pair of upper and lower When the middle folded jacks 5 and 5 are extended, the front barrel 2 is refracted with respect to the rear barrel 3 with the pivoting portion on the joint portion side of the front and rear barrels 2 and 3 in one of the upper and lower middle folded jacks 5 and 5 as a fulcrum. As indicated by a two-dot chain line, the horizontal fixing plate 6 is also tilted integrally in the same circumferential direction along the arcuate side end surfaces 7b, 7b of the receiving members 7B, 7B at both end surfaces thereof. At this time, since the seat members 7B and 7B have their front and back surfaces oriented in the front-rear direction, the end surfaces on both ends of the horizontal fixing plate 6 are largely tilted without contacting the plate surfaces of the seat members 7B and 7B. Therefore, a desired sharply curved nail can be smoothly excavated. In any of the mechanisms shown in FIGS. 11 and 12, rolling occurs when the side end surface at the tip of the horizontal fixing plate 6 is the bent top 7a1 of the receiving member 7A or the arcuate side end surface of the receiving member 7B. It can be prevented by contacting and receiving 7b.

The simplified longitudinal section side view of a folding shield excavator. The simplified vertical front view which shows the arrangement | positioning state of a jack and a rolling prevention mechanism. The simplified top view of a rolling prevention mechanism. The side view. The simplified cross-sectional view for demonstrating the tilting state of a horizontal fixed board. The simplified top view of the rolling prevention mechanism which enabled transfer of a horizontal fixed board. The simplified top view which shows the state which moved the horizontal fixing board to the left side. The simplified top view which shows the state which moved the horizontal fixing board to the right side. The simplified top view which shows another Example of the rolling prevention mechanism of this invention.

DESCRIPTION OF SYMBOLS 1 Shield body 2 Front trunk 3 Rear trunk 4 Convex arc-shaped curved surface 5 Middle folding jack 6 Horizontal fixing plate 7 Seat member
11 Cutter head
12 Propulsion jack
20 pedestal

Claims (2)

A cylindrical shield body having a cutter head disposed at the front end is divided into a front cylinder and a rear cylinder, and the front cylinder and the rear cylinder are arranged at predetermined intervals in the circumferential direction. In the folding shield excavator having a rolling prevention mechanism provided at opposite end portions of the front and rear cylinders that are refractably joined to each other by a folding jack and bent in the left-right direction. The prevention mechanism is composed of a flat rectangular plate made of a flat rectangular plate projecting from the upper and lower parts of the inner peripheral surface of either the front cylinder or the rear cylinder toward the inner peripheral surface of the other cylinder. A pair of left and right receiving members fixed to the upper and lower inner peripheral surfaces of the other body on both ends of the top and bottom horizontal fixing plates from the left and right sides with a small gap between them. It consists, facing these seat member Anti-rolling mechanism in foldable shield excavator in which characterized in that it forms a plane perpendicular to the end face of the flat mountain shape or a convex arcuate. A cylindrical shield body having a cutter head disposed at the front end is divided into a front cylinder and a rear cylinder, and the front cylinder and the rear cylinder are arranged at predetermined intervals in the circumferential direction. In the folding shield excavator having a rolling prevention mechanism provided at opposite end portions of the front and rear cylinders that are refractably joined to each other by a folding jack and bent in the left-right direction. The prevention mechanism includes an upper and lower horizontal fixing plate projecting from the upper and lower portions of the inner peripheral surface of either the front cylinder or the rear cylinder toward the inner peripheral surface of the other cylinder, and the other cylinder The horizontal fixing plate includes a pair of left and right receiving members fixed to the upper and lower inner peripheral surfaces with a small gap from the both end surfaces so that both end surfaces of the top and bottom horizontal fixing plates are sandwiched from the left and right sides, respectively. On the base fixed to the inner peripheral surface of the torso According to a predetermined refraction angle in the left-right direction of the front trunk with respect to the rear trunk at the time of excavation of the curved tunnel portion, it is configured to be moved and fixed in a state where the direction is changed by the same angle. Anti-rolling mechanism in the folding shield excavator.

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