JPH05321574A - Middle bend shield excavator - Google Patents

Abstract

PURPOSE:To facilitate work in the case a front body has to be bend in a vertical direction against a rear body in a shield excavator capable of bending the front body in a horizontal direction against the rear body. CONSTITUTION:In a middle bent shield excavator equipped with a front body 20 and a rear body 22 bearing the front body in a horizontal direction in a bendable manner at two perpendicular positions, each position has a hollow casing pen 24, center pin 26 and spacer 28. The casing pin 24 is mounted to the rear bod 22 so that it can be moved within range of a gap provided in a transverse direction, and the casing pin 24 is so mounted to the front body 20 that it is capable of turning around the horizontal axis. The center pin 26 is inserted in the casing pin 24 and a hole 72 of the rear body 22 in a detachable manner, and the spacer 28 is inserted in the gap in a detachable manner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a center-bending shield propulsion machine, and more specifically, to a front body and a rear body that supports the front body at two vertical positions so as to be horizontally bendable. The present invention relates to a middle-break type shield propulsion machine.

[0002]

2. Description of the Related Art As shown in FIG. 7, two spacers 12 and 13 are fitted to a bracket 11 of a front body 10, while they are located inside a bracket 15 of a rear body 14 having a substantially U-shape. The two spacers 16 and 17 are fitted to the portion to be joined, and the coupling structure formed by inserting the pin 18 into both brackets 11 and 15 through the spacers is arranged vertically at the center of the front and rear torso. A center-breaking shield propulsion machine has been proposed (Japanese Utility Model Laid-Open No. 3-125896).

In the above-mentioned shield propulsion machine, in the state shown in FIG. 7, the front body 10 can be bent horizontally around the pin 18, and further, of the two spacers 12 and 13.
The spacer 12 at the front of the upper coupling structure and the spacer 13 at the rear of the lower coupling structure are replaced by smaller spacers than those shown, and the spacer 13 at the rear of the upper coupling structure and the front of the lower coupling structure are replaced. Replacing the spacer 12 with a spacer larger than that shown in the drawing causes the front body 10 to bend upward, and vice versa, the front body 10 bends downward.

[0004]

When the spacers 12 and 13 are replaced with other spacers, that is, when the front body is to be bent up and down with respect to the rear body, the spacers 16 and 17 located inside are first removed. After that, the outer spacers 12 and 13 must be taken out to fit another spacer of a predetermined size, and finally the inner spacers 16 and 17 must be fitted, which is troublesome.

An object of the present invention is to simplify the work when the front body should be bent vertically with respect to the rear body in a shield propulsion machine capable of folding the front body horizontally with respect to the rear body. , To provide a center-breakable shield propulsion machine.

[0006]

DISCLOSURE OF THE INVENTION The present invention is directed to a center fold type shield propulsion system including a front body and a rear body that supports the front body so that the front body can be bent horizontally at two locations. In the machine, a hollow casing pin, a center pin, and a spacer are provided at each of the positions. The casing pin is movably attached to one of the front body and the rear body in a range of a gap provided in the front-rear direction, and is swingable around the horizontal axis on the other of the front body and the rear body. It is attached. The center pin is removably inserted in the casing pin and the one of the front body and the rear body, and the spacer is removably inserted in the gap.

When the shield propulsion machine is propelled linearly or when it is bent in the horizontal direction and propelled, the center pin is inserted into the casing pin and one of the front body and the rear body, and a spacer is provided between the one of the gaps. Keep it in place. When the front body is to be bent vertically with respect to the rear body, the center pin and the spacer are pulled out.

Since it is possible to deal with the bending in the vertical direction only by removing the center pin from the casing pin and the spacer from the gap, the work is simple.

Since the front body can be bent horizontally and vertically with respect to the rear body, three-dimensional propulsion is possible.

The casing pin is preferably attached to the other of the front body and the rear body via a spherical bearing.

This prevents the casing pin from being twisted when the front body is bent vertically with respect to the rear body.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A shield propulsion machine, as shown in FIGS. 1 to 4, includes a front body 20 and a rear body 22 which supports the front body 20 at two locations in the vertical direction so as to be horizontally bendable. And the casing pin 24, the center pin 26,
And a spacer 28.

The front body 20 receives thrust from a jack (not shown) through the rear body 22 and propels it. A cutter 30 is provided at the tip, and a partition wall 32 is provided at a distance rearward from the cutter 30. The cutter 30 is rotated by a motor 34 attached to the partition wall 32. The earth and sand excavated by the cutter 30 is guided to the chamber 36 between the cutter 30 and the partition wall 32, and the earth and sand appropriately vibrated and stirred by the agitator 38 is discharged backward by the conveyor 40. The configuration itself is known.

The connecting portion of the front body 20 with the rear body 22 is formed into a concave spherical surface 42 centered on a point O on the central axis extending in the front-rear direction of the shield propulsion unit, and the rear body 22 with the front body 20. The connecting portion is formed on the convex spherical surface 44 centered on the point O. As a result of fitting the convex spherical surface 44 into the concave spherical surface 42 to form a spherical joint, the front body 20 can be bent in the horizontal direction around the center pin 26.

Brackets 50 are provided at two locations in the center of the front body 20 at the upper and lower portions in the vertical direction, and brackets 52 are provided at two locations in the center of the rear body 22 at the upper and lower portions in the vertical direction. With respect to these brackets, as will be described later, where the casing pin 24, the center pin 26, and the spacer 28 are mounted, the upper mounting structure and the lower mounting structure are symmetric with respect to the horizontal plane including the point O, so that Will be described for the lower mounting structure.

The casing pin 24 is hollow, and the front body 2
It is movably attached to one of the front body 20 and the rear body 22 within a gap provided in the front-rear direction, and is attached to the other of the front body 20 and the rear body 22 so as to be swingable about a horizontal axis.

In the illustrated embodiment, the casing pin 24
Are attached using brackets 50 and 52. The bracket 50 includes a support portion 54 protruding inward in the radial direction from the front body 20, and a connecting portion 55 extending from the support portion 54 rearward in the axial direction of the front body 20. On the other hand, the bracket 52 includes a support portion 58 that protrudes inward in the radial direction from the rear body 22, and two connecting portions that extend from the support portion 58 in the axial direction of the rear body 22 and are spaced apart in the radial direction. 5
9 and 60, the two connecting portions 59 and 60 are connected to each other by the two reinforcing portions 61, and the vertical cross section has a rectangular shape. The connecting portion 55 of the bracket 50 is arranged with a clearance in the rectangular cross section of the bracket 52.

Two connecting portions 59, 60 of the bracket 52
Has an elongated hole 66 in which the outer diameter of the cylindrical plain bearing 64 is a minor axis length, the major axis length is longer than the outer diameter, and the major axis extends in the axial direction of the rear case 22. The cylindrical casing pin 24 is rotatably fitted to the two slide bearings 64, one of the two slide bearings 64 being in the elongated hole 66 of the connecting portion 59, and the other of the slide bearings 64 being the connecting portion 60. Is slidably fitted in the long hole 66 of. As a result, the casing pin 24 is movable with respect to the bracket 52 in the axial direction of the rear body 22, that is, in the front-back direction.

The connecting portion 55 of the bracket 50 is connected to the casing pin 24 via a spherical bearing 68. The spherical bearing 68 includes a convex spherical surface 70 fixed to the casing pin 24 and a concave spherical surface 71 fixed to the connecting portion 55. The convex spherical surface 70 and the concave spherical surface 71 are centered on the axis of the center pin 26, and are preferably made of a material having a low friction coefficient such as oil-impregnated metal or plastic.

The center pin 26 is made of a solid material and is removably inserted into the casing pin 24 and the hole 72 formed in the rear body 22. The center pin 26 is the casing pin 2
4 and the hole 72 have a diameter to be fitted with a clearance fit.
Place the pin retainer 74 on the center pin 26, and
4 through the bolt 76 to the center pin 26,
A bolt 78 penetrating the pin retainer 74 is screwed into the connecting portion 60 to hold the center pin 26 in a fixed state.

The spacer 28 is removably inserted into the gap between the elongated bearing 66 of the connecting portion 60 of the bracket 52 and the slide bearing 64. Even when the bracket 52 is provided with the two connecting parts 59 and 60 and each connecting part has the elongated hole 66 as in the illustrated embodiment, the spacer 28 has a gap between the connecting parts 60 located inward in the radial direction. Only need to insert it.

A yawing jack 80 is attached to the connecting portion between the front body 20 and the rear body 22 symmetrically with respect to a vertical plane including the axes of the two upper and lower center pins 26 and the center axis extending in the front-rear direction. Although only one yawing jack 80 is shown in FIG. 3, actually, for example, three yawing jacks 80 are arranged on one side of the vertical plane, and one of them is placed on a horizontal plane including a central axis extending in the front-rear direction. And place the other two at equal intervals above and below.
When the rear body 22 is pulled toward the front body by these yawing jacks 80, the movement of the rear body 22 is stopped by a stopper (not shown), and the front body 20 and the rear body 22 are adjusted to be horizontal. ..

When the shield propulsion machine goes straight ahead, as shown in FIG. 1, the center pin 26 is inserted into the casing pin 24 and the rear body 22, the spacer 28 is inserted into the gap, and all the yawing jacks 80 are used for rearward movement. The body 22 is pulled toward the front body 20, and the thrust of the jack is transmitted to the front body 20 via the rear body 22.

The front body 20 is horizontally arranged with respect to the rear body 22,
For example, to bend it to the right, retract the yawing jack 80 on the right and the yawing jack 8 on the left.
Extend 0 to transmit thrust. Then, the front body 20 is bent rightward about the upper and lower center pins 26.

To bend the front body 20 upward with respect to the rear body 22, as shown in FIG. 5, the center pin is pulled out from the casing pin 24 and the spacer is pulled out. Then, a horizontal plane P including the central axis extending in the front-rear direction
The yawing jack 80 located above is contracted, and the yawing jack 80 located below the horizontal plane P is extended to transmit thrust. Then, the casing pin 24 swings at the connecting portion 55 of the bracket 50, the slide bearings 64 slide backward through the long holes of the two connecting portions 59 and 60 of the upper bracket 52, and move rearward, so that the lower bracket 52 of the lower bracket 52 is moved. The slide bearings 64 slide forward in the elongated holes of the two connecting portions 59 and 60, respectively, and the front body 20 bends at an angle α.

In order to bend the front body 20 downward with respect to the rear body 22, as shown in FIG. 6, the center pin is pulled out from the casing pin 24 and, after the spacer is pulled out, the center axis extending in the front-rear direction. The yawing jack 80 below the horizontal plane P including the
Extend the yawing jack 80 located higher to transmit the thrust. Then, the casing pin 50
Swings at the connecting portion 55 of the bracket 50, the slide bearing 64 slides forward through the long holes of the two connecting portions 59 and 60 of the upper bracket 52, and the two connecting portions 59 of the lower bracket 52 are moved. Sliding bearing 64 with long holes of 60
Slip and move rearward, and the front torso 20 bends at an angle β.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an embodiment of a connecting portion between a front body and a rear body of a shield propulsion machine according to the present invention, taken along a plane including a central axis extending in the front-rear direction of the shield propulsion machine.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a sectional view of an embodiment of the shield propulsion device according to the present invention, taken along a plane including a central axis extending in the front-rear direction of the shield propulsion device.

FIG. 4 is a sectional view similar to FIG. 1, showing a state in which a center pin and a spacer are removed.

FIG. 5 is a cross-sectional view showing the operation of the shield propulsion device according to the present invention, taken along a plane including the central axis extending in the front-rear direction of the shield propulsion device, in which the front body is bent upward with respect to the rear body. There is.

FIG. 6 is a cross-sectional view showing the action of the shield propulsion device according to the present invention, taken along a plane including the central axis extending in the front-rear direction of the shield propulsion device, in which the front body is bent downward with respect to the rear body. There is.

FIG. 7 is a cross-sectional view showing a connecting portion between a front body and a rear body of a conventional shield propulsion machine.

[Explanation of symbols]

 20 Front Body 22 Rear Body 24 Casing Pin 26 Center Pin 28 Spacer 50, 52 Bracket 55, 59, 60 Connecting Part 68 Spherical Bearing

Claims (2)

[Claims] 1. A center-bending shield propulsion machine comprising a front body and a rear body that supports the front body so that the front body can be bent horizontally at two locations. The front body and the rear body A hollow casing pin movably attached to one of the front and rear bodies so as to be movable within a gap provided in the front-rear direction and swingably around a horizontal axis, and the casing pin and the front A center-bending shield propulsion machine comprising a center pin removably inserted into one of the body and the rear body and a spacer removably inserted into the gap at each of the positions. 2. The center-breakable shield propulsion device according to claim 1, wherein the casing pin is attached to the other of the front body and the rear body via a spherical bearing.