JP2008248508A - Jacking device of shield machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a jacking device without generating wrench force in shield jacks, even if a difference is caused in an extension speed and the extension length of connected respective expansion rods, in the jacking device of a shield machine of connecting the expansion rods of a plurality of shield jacks. <P>SOLUTION: This jacking device has the plurality of shield jacks 1 arranged at an interval in the peripheral direction, shoes 6 installed in an end part of the expansion rods 5 of these shield jacks 1 so as to be capable of oscillating, and a connecting plate 13 connecting a plurality of mutual shoes 6, on an inner peripheral surface of a cylindrical shield frame 2 forming an outer shell of the shield machine, for advancing the shield machine by taking reaction to an existing segment. The plurality of shoes 6 connected by the connecting plate 13 have one fixed shoe 6a fixed to the connecting plate 13 and a sliding shoe 6b slidably allowed to abut on the connecting plate 13. An engaging mechanism 14 is interposed between the sliding shoe 6b and the connecting plate 13 for engaging both by allowing the relative movement in a predetermined range. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a propulsion device for a shield machine in which a plurality of shield jacks provided as a propulsion device is connected to the shield machine, and more particularly to a propulsion device for a shield machine suitable for a large-diameter shield machine.

  The shield machine has a main body having a cylindrical shield frame, a cutter disposed to cut the face at the front of the machine, and earth and sand cut by the cutter inside the machine. Take the reaction force to the earth removing device for taking in, the erector provided inside the excavator body to assemble the segment in a ring shape along the inner peripheral surface of the shield frame, and the segment assembled in the ring shape In order to advance the main body of the excavator, a plurality of shield jacks are provided on the inner peripheral surface of the shield frame at intervals in the circumferential direction. Such a shield machine extends the shield jack, presses the cutter against the face, cuts the face with the cutter, takes the excavated earth and sand into the inside of the machine by a soil removal device (screw conveyor, etc.), The main body is moved forward (excavated) according to the extension stroke of the shield jack, and after that, the shield jack is contracted to form a space between the existing segment and the shield jack, and the segment is assembled into a ring shape by an elector in that space. To build a tunnel.

  By the way, in the so-called large-diameter shield excavator having a large shield frame diameter (for example, 10 m or more), the area of the face becomes large, which is great for overcoming the face pressure (earth pressure, water pressure) and moving the excavator body forward. Thrust is required, and in order to increase the number of shield jacks, it is necessary to reduce the interval between the shield jacks and arrange the shield jacks closely. However, if the shield jacks are densely arranged, it is impossible to equip each end of the extensible rod of each shield jack with a shoe (a member for pressing an existing segment). That is, the segment pressing portion of the shoe needs a predetermined area in order to disperse the pressing force on the segment, and the shoe having the segment pressing portion having such an area is arranged adjacent to each other with a small interval. If you try to attach each to the telescopic rod of the shield jack, adjacent shoes will interfere with each other.

  Therefore, as shown in FIG. 10, a common shoe 6c (hereinafter referred to as a common shoe) is attached to the telescopic rod 5 of the adjacent shield jack 1, and the interval between the adjacent shield jacks 1 is reduced, and the segment pressing of the common shoe 6c is performed. A propulsion device for a shield machine that is compatible with the expansion of the area of the portion 6d is known (Patent Document 1).

JP-A-7-180478

  In the conventional shield machine propulsion device, the common shoe 6c is not loosely connected to the end of the telescopic rod 5 of the adjacent shield jack 1 via the spherical bearing 20 (via the minimum gap necessary for movement). Wearing. For this reason, when a difference occurs in the extension speed and extension length of each telescopic rod 5, a twisting (squeezing force) is generated in the telescopic rod 5 of each shield jack 1.

  That is, if the extension speeds and extension lengths of the telescopic rods 5 connected by the common shoe 6c are equal, the common shoe 6c moves to the right in the figure while maintaining the posture orthogonal to the telescopic rod 5. Does not occur. However, when a difference occurs in the extension speed and extension length of the telescopic rod 5 of each shield jack 1, the posture of the common shoe 6c changes obliquely. Then, since the distance between the centers of the spherical bearings 20 of the common shoe 6c is constant, the ends of the telescopic rods 5 of the respective shield jacks 1 (portions connected by the common shoe 6c) try to approach each other. Since the cylinder 4 of each shield jack 1 is fixed to the shield frame, a twisting force (lateral force perpendicular to the expansion / contraction direction of the expansion / contraction rod 5) is generated on the expansion / contraction rod 5 of each shield jack 1.

  If the twisting force is large, the shield jack 1 may not be damaged. If the shield jack 1 is damaged, the tunnel excavation work must be interrupted for repair, resulting in a delay in the construction period. In order to avoid this, each shield jack 1 must be hydraulically controlled with high precision so that the extension speeds and extension lengths of the telescopic rods 5 connected by the common shoe 6c are equal, leading to an increase in cost. .

  Therefore, an object of the present invention is to provide a shield tunneling machine propulsion device in which a plurality of shield jack telescopic rods are connected, and even if there is a difference in the extension speed and extension length of each connected telescopic rod, An object of the present invention is to provide a propulsion device for a shield machine that does not cause any problems.

  To achieve the above object, a propulsion device for a shield machine according to the present invention provides a shield shield machine with a reaction force applied to an existing segment on an inner peripheral surface of a cylindrical shield frame forming an outer shell of the shield machine. In order to advance the machine, a plurality of shield jacks arranged at intervals in the circumferential direction, a shoe attached to an end of an expansion rod of the shield jack so as to be able to swing, and a plurality of shoes are coupled to each other. A plurality of shoes connected by the connecting plate, the fixed shoe fixed to the connecting plate, and a sliding shoe slidably contacted with the connecting plate, An engagement mechanism is provided between the sliding shoe and the connecting plate so as to allow both to engage with each other while allowing relative movement within a predetermined range.

  The engagement mechanism is provided on an engagement portion provided on a side surface of the sliding shoe and the connection plate, and surrounds the engagement portion with a predetermined gap in a radial direction and an axial direction of the telescopic rod. It is preferable to have the engaged part formed in the.

  It is preferable that the sliding shoe is disposed on both sides of the fixed shoe.

  According to the present invention, in a propulsion device for a shield machine in which a plurality of shield jack telescopic rods are connected, even if there is a difference in the extension speed and extension length of each connected telescopic rod, a twisting force is generated in the shield jack. Absent.

  A preferred embodiment of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a plan view of a shield jack constituting the propulsion device for a shield machine according to the present embodiment as viewed from the inside in the radial direction of the shield frame, FIG. 2 is a cross-sectional view taken along the line II-II of FIG. It is the III-III arrow directional view of FIG.

  As shown in FIGS. 1 to 3, a plurality of shield jacks 1 are arranged on the inner peripheral surface of a cylindrical shield frame 2 that forms the outer shell of the shield machine, with a gap in the circumferential direction. Each shield jack 1 is disposed along the axial direction of the shield frame 2 and takes a reaction force on an existing segment to advance the shield machine (shield frame 2).

  The shield jack 1 includes a cylinder 4 fixed to the inner peripheral surface of the shield frame 2 via a bracket 3 (ring girder) along the axial direction of the shield frame 2, and an expansion and contraction that protrudes rearward in the axial direction from the rear end of the cylinder 4. It has a rod 5 and a shoe 6 attached to the end (rear end) of the telescopic rod 5 so as to be able to swing. A spherical bearing 7 is interposed between the rear end of the telescopic rod 5 and the shoe 6. The spherical bearing 7 has a convex spherical surface portion 8 provided at the rear end portion of the telescopic rod 5 and a concave spherical surface portion 9 that is recessed in accordance with the curvature of the convex spherical surface portion 8 on the front surface portion of the shoe 6.

  The convex spherical surface portion 8 and the concave spherical surface portion 9 are connected by a pin 10 disposed in a direction perpendicular to the paper surface of FIG. 1, and the shoe 6 can be rotated around the pin 10 within a predetermined range. The pin 10 of the shoe 6 of the shield jack 1 in the middle of FIG. 1 is arranged along the normal direction of the cylindrical shield frame 2, and the pin 10 of the shoe 6 of the upper and lower shield jacks 1 of FIG. It is arranged in parallel with the pin 10 of the middle shield jack 1. An elastic plate 11 (such as rubber) is attached to the rear end of the telescopic rod 5 in order to allow the shoe 6 to rotate around the pin 10 as shown in FIG.

  The propulsion device 12 of the shield machine according to the present embodiment includes a connecting plate 13 that connects the shoes 6 of the three upper and lower shield jacks 1 in FIG. The three shoes 6 connected by the connecting plate 13 can be classified into a central fixed shoe 6 a fixed to the connecting plate 13 and upper and lower sliding shoes 6 b slidably contacted with the connecting plate 13. The fixed shoe 6a and the sliding shoe 6b are formed in a columnar shape along the axial direction of the telescopic rod 5, and the concave spherical surface portion 9 is formed on the top surface of the cylinder in the axial direction front part. A fixed portion fixed to the connecting plate 13 by welding, bolts, or the like is formed on the cylindrical bottom surface of the rear portion in the axial direction of the fixed shoe 6a, while the connecting plate 13 and the cylindrical bottom surface in the axial rear portion of the sliding shoe 6b are formed. A sliding contact portion is formed that is in sliding contact.

  Further, the propulsion device 12 of the shield machine according to the present embodiment includes an engagement mechanism 14 that engages the sliding shoe 6 b and the connecting plate 13. The engagement mechanism 14 engages the sliding shoe 6b and the connecting plate 13 while allowing relative movement within a predetermined range. The engagement mechanism 14 includes an engagement portion 15 provided on the side surface of the sliding shoe 6 b and an engaged portion 16 provided on the connecting plate 13. The engaging portion 15 is formed so as to project radially outward from the side surface of the sliding shoe 6b, and the engaged portion 16 extends through the engaging portion 15 in the radial direction and the axial direction of the sliding shoe 6b (expandable rod 5). Each is formed so as to surround a predetermined gap.

  Specifically, the engaging portion 15 is formed of a bracket attached to the side surface of the sliding shoe 6b, the engaged portion 16 is fixed to the connecting plate 13, and the engaging portion 15 is moved from the radially outer side of the sliding shoe 6b. The cover 16a surrounds the predetermined gap A, and the stopper 16b is provided on the cover 16a and is disposed from the front end of the engaging portion 15 in the axial direction of the sliding shoe 6b with the predetermined gap B therebetween. The stopper 16 b has a function of engaging the front end of the engaging portion 15 and pulling the connecting plate 13 toward the cylinder 4 when the telescopic rod 5 is immersed in the cylinder 4. A predetermined gap C is provided between the stopper 16b and the sliding shoe 6b in the radial direction of the sliding shoe 6b.

  The predetermined gaps A, B, and C are gaps when the connecting plate 13 is in a posture orthogonal to the axial direction of each shield jack 1 as shown in FIG. Further, a reinforcing plate 17 is attached to the connecting plate 13 so as to be positioned between the central fixed shoe 6a and the sliding shoes 6b on both sides thereof.

  The operation of this embodiment will be described.

  When the shield machine is moved forward, the three shield jacks 1 shown in FIG. 1 are extended, and each of the telescopic rods 5 protrudes from the cylinder 4 to the right in the drawing, and the existing segment on the right side of the connecting plate 13 in FIG. The front end surface in the tunnel axis direction is pressed. Here, when the extension speed and extension length of the three shield jacks 1 are equal, the connecting plate 13 moves to the right in FIG. Of course, no twisting force is generated in the three shield jacks 1.

  On the other hand, when there is a difference in the extension speed and extension length of the three shield jacks 1, the engagement mechanism 14 allows relative movement between the sliding shoe 6b and the connecting plate 13, as shown in FIG. That is, the fixed shoe 6a and the sliding shoe 6b rotate around the pin 10 and the sliding shoe 6b slides with respect to the connecting plate 13, so that the expansion rod 5 of the three shield jacks 1 can be connected without causing a twisting force. Appropriate tilting of the plate 13 is allowed. As a result, in order to avoid the generation of the twisting force, it is not necessary to accurately hydraulically control each shield jack 1 so that the extension speed and extension length of each telescopic rod 5 connected by the connecting plate 13 are equal, This leads to cost reduction.

  That is, according to the propulsion device 12 of the shield machine according to the present embodiment, in the large-diameter shield machine, the distance between the adjacent shield jacks 1 is reduced and the shoe 6 of the telescopic rod 5 of the adjacent shield jack 1 is connected to the connecting plate. 13, even if the space between the shield jacks 5 is narrowed and the area of the segment pressing portion of the shoe 6 is increased, the extension speed and extension length of each of the telescopic rods 5 connected by the connecting plate 13. Therefore, it is not necessary to hydraulically control each shield jack 1 with high accuracy so that the two are equal, leading to cost reduction.

  The prevention of the twisting force is achieved by a simple configuration in which the predetermined gaps A, B, C are provided between the engaging portion 15 and the engaged portion 16 of the engaging mechanism 14, so that the cost is low and reliable. Can be prevented. In other words, the propulsion device 12 of the shield machine according to the present embodiment reliably uses a simple structure, that is, at low cost, to produce a twisting force that is to occur in each shield jack 1 to which the telescopic rod 5 is connected by the connecting plate 13. Can escape.

  In addition, as shown in FIG. 4, the connecting plate 13 is pressed against the existing segment in an oblique posture, so that the shield engraving machine (shield frame 2) is inclined with respect to the axial direction of the shield jack 1 as a reaction force of the shield jack 1. Since components are generated, it is possible to control the rolling of the shield machine (rotation around the axis of the shield frame 2) and the direction of the shield machine.

  Since the connecting plate 13 can be considered to rotate around the pin 10 of the central fixed shoe 6a in FIG. 1, a stroke sensor is provided only in the central shield jack 1, and only the stroke of the central shield jack 1 is provided. You may make it control.

  Modified embodiments of the present invention are shown in FIGS.

  This modified embodiment differs from the previous embodiment only in that the number of shield jacks 1 is changed from three to four in the previous embodiment, and the other configuration is the same as in the previous embodiment. Therefore, the same components are denoted by the same reference numerals and description thereof is omitted.

  FIG. 9 is an explanatory view showing a propulsion device for a shield machine equipped with a first embodiment (a bundle of three shield jacks 1) and a modified embodiment (a bundle of four shield jacks 1). It is. As shown in FIG. 9, the shield jack 1 arranged above the shield frame 2 is applied with the first embodiment in which three are bundled, and the shield jack 1 arranged below is a modification in which four are bundled. The embodiment is applied. This is because, in the up and down direction of the diameter of the shield frame 2 at the face, the earth load is larger by the diameter of the shield frame 2 in the lower part than in the upper part, so that a larger thrust is required in the lower part than in the upper part. . Therefore, the circumferential pitch of the lower shield jack 1 is smaller than that of the upper one, and a modified embodiment in which four are bundled is applied to the lower shield jack 1 having a narrow pitch, and the upper shield having a wider pitch is applied. The first embodiment in which three jacks are bundled is applied to the jack 1.

  In addition, this invention is not limited to each embodiment mentioned above.

  For example, the upper or lower shield jack 1 shown in FIG. 1 is omitted, and the shoes 6a and 6b of the remaining two shield jacks 1 are connected to each other by a connecting plate 13 having a length of two jacks in the same manner as shown in FIG. You may connect. Moreover, in FIG. 5, you may connect the shoes 6 of five or more shield jacks 1 instead of four with the connection board 13 similarly to what is shown in FIG. When the number of the shield jacks 1 is an odd number, the fixed shoe 6a is preferably arranged in the center. This is because the connecting plate 13 can be considered to rotate around the pin 10 of the central fixed shoe 6a, and only the central shield jack 1 needs to have a stroke sensor. However, the position of the fixed shoe 6a is not limited to the center and may be any position. This also applies to the type in which the three shield jacks 1 in FIG. 1 are bundled and the type in which the four shield jacks 1 in FIG. 5 are bundled.

It is explanatory drawing which shows the propulsion apparatus of the shield machine which concerns on one Embodiment of this invention, and is the top view which looked at the shield jack which comprises the propulsion apparatus from the radial inside of the shield frame. It is the II-II sectional view taken on the line of FIG. It is the III-III arrow directional view of FIG. It is an action | operation figure of the propulsion apparatus shown in FIG. It is explanatory drawing which shows the propulsion apparatus of the shield machine which concerns on the deformation | transformation embodiment of this invention, and is the top view which looked at the shield jack which comprises the propulsion apparatus from the radial direction inner side of the shield frame. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5. It is the VII-VII line arrow directional view of FIG. FIG. 6 is an operation diagram of the propulsion device shown in FIG. 5. It is a rear view of the shield machine provided with the propulsion apparatus of the shield machine according to the embodiment of FIG. 1 and the propulsion apparatus of the shield machine according to the modified embodiment of FIG. It is explanatory drawing which shows the propulsion apparatus of the shield machine which concerns on a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shield jack 2 Shield frame 5 Telescopic rod 6 Shoe 6a Fixed shoe 6b Sliding shoe 12 Shield excavator propulsion device 13 Connecting plate 14 Engagement mechanism 15 Engagement part 16 Engagement part

Claims (3)

In order to advance the shield machine by taking a reaction force on an existing segment on the inner peripheral surface of a cylindrical shield frame that forms the outer shell of the shield machine, a plurality of pieces arranged at intervals in the circumferential direction are provided. With a shield jack,
A shoe attached to the end of the extension rod of these shield jacks so that it can swing,
Having a connecting plate for connecting a plurality of shoes,
The plurality of shoes connected by the connecting plate includes one fixed shoe fixed to the connecting plate, and a sliding shoe slidably contacted with the connecting plate,
A propulsion device for a shield machine, wherein an engagement mechanism is provided between the sliding shoe and the connecting plate to engage with each other while allowing relative movement within a predetermined range. The engagement mechanism is
An engaging portion provided on a side surface of the sliding shoe;
2. The shield machine according to claim 1, further comprising an engaged portion that is provided on the connecting plate and that surrounds the engaging portion with a predetermined gap in a radial direction and an axial direction of the telescopic rod. Propulsion device.   The propulsion device for a shield machine according to claim 1 or 2, wherein the sliding shoes are arranged on both sides of the fixed shoe.

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