JPH05149081A - Intermediate drum of multistage middle bent type shield excavator - Google Patents

Abstract

PURPOSE:To facilitate execution of an extra steep curve having the approximately minimum radius of curvature 10 m and to make it possible to also execute a free directional curve. CONSTITUTION:In a middle bent type shield excavator, multistage intermediate drums 33 are used for a middle bent section, the intermediate drums 33 are formed in a cylindrical shape with a stage so that they are overlapped each other at the stage and an bending section of the intermediate drum 33 is used for a receiving surface 37 in the case of driving. The front end of the intermediate drum 33 is used for the end 38 running against the receiving surface 37 of the front intermediate drum 33. A guide projection 43 is fixed to the inside of the bending section of the intermediate drum 33, and the projection 43 is interlocked with an axial slot 42 provided to a stopper member 41 fixed to the inside of the front intermediate drum 33 coming into contact therewith and is slid.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-stage intermediate folding shield machine.

[0002]

2. Description of the Related Art A two-fold or three-fold excavator has been put into practical use for curved construction, but its radius is about 15 m. There is also a shield machine with a multi-stage barrel (Japanese Patent Publication No. 2-125090), but the outer periphery of the intermediate barrel or ring body is made spherical so that the turning center comes to the center of the shield.

1 to 3, the shield body 1 includes a front body 3 having a cutter head 2.
And the rear torso 4 are divided into two parts.
Connected through.

In the cutter head 2, a rotary shaft 6 is rotatably and tiltably supported by a pressure partition wall 7 via a bearing 8, and a drive motor 10 is attached to a gear 9 attached to the rear end of the rotary shaft 6.
The pinion 11 of the output shaft of is engaged. A cutter tilting jack 13 for tilting the cutter head 2 in the excavating direction is connected between the cover 12 mounted on the bearing 8 and supporting the driving motor 10 and the pressure partition wall 7.

A segment selector 15 for assembling the carried-in segment 14 is arranged on the rear body 4, and a plurality of propulsion jacks 1 projecting toward the segment 14 side.
6 are attached at predetermined intervals in the circumferential direction, and the front end face of the segment 14 assembled by the segment selector 15 is used as a reaction force receiver to propel the shield body 1 forward.

A plurality of tilting jacks 17 for tiltably connecting the front body 3 and the rear body 4 are arranged at the curved portion 5 at predetermined intervals in the circumferential direction, and a part of the jacks 17 are slidably fitted together. It is provided with a plurality of ring bodies 18, 19A and 19B.
That is, as shown in FIG.
A and 19B are arranged at regular intervals between the front body 3 and the rear body 4 and have, for example, three outer ring bodies 18 having substantially the same outer diameter as the shield body 1, and the front body 3 or the rear body 4. End inner ring body 1 fixed to the outer end and fitted to the outer ring body 18
9A, and both ends of the outer ring body 18 are fitted into the outer ring body 18, for example, two intermediate inner ring bodies 19B.

The sliding surfaces 20A and 20B between the inner ring bodies 19A and 19B and the outer ring body 18 are shielded by the shield body 1.
The ring-shaped seal member 2 is formed in a spherical shape with a radius R from a predetermined position a on the axis A of the outer ring body 18.
1 is attached.

Brackets 22 project from the inner surface of the intermediate inner ring body 19B at regular intervals in the circumferential direction, and a screw rod 24 with a turnbuckle 23 is connected between the brackets 22 of the front and rear intermediate inner ring bodies 19B. A space adjusting device 25 is provided.

In the above construction, when performing curved construction, as shown in FIGS. 2 and 3, the cutter tilting jack 13 is used.
The cutter head 2 is tilted in the direction of the curve by this, the turn buckle 23 of each interval adjusting device 25 is rotated to adjust the interval of the intermediate inner ring body 19B, and the tilting jack 17 is tilted to move the front body 3 And fold back body 4. Then, the inner and outer ring bodies 19A, 19B and 18 of the bending portion 5 slide and bend on the sliding surfaces 20A and 20B.

In such a structure, there is a problem that the amount of excess digging increases because the center of centering of each ring member forming the curved portion is the axis center. Further, since the tilting jack is a pin connection, there is a problem that the rigidity is small when going straight and stable straightness cannot be obtained.

[0011]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an excavator capable of constructing a super sharp curve having a minimum radius of curvature of about 10 m and also capable of constructing a curve in any direction. In other words, the shield machine has a multi-stage intermediate cylinder, and the center of the center bend is not the center of each intermediate cylinder, but the outer end of each intermediate cylinder, thereby reducing the amount of excess digging. The purpose of the present invention is to provide an excavator that is easy to bend and that can easily take a curved track from the start of curved construction.

[0012]

In a center-folded shield excavator, a multi-stage intermediate barrel 33 is used for the center-folded portion, and the intermediate barrel 33 has a stepped cylindrical shape in which the intermediate barrels 33 overlap each other at the step portion. The bent portion of the intermediate body 33 serves as a receiving surface 37 for propulsion, while the tip end surface of the mating intermediate body serves as an abutting surface 38 that abuts the receiving surface 37, and the inner surface of the bent portion of the intermediate body 33 serves as a guide surface. The protrusion 43 is fixed, and the protrusion 43 is engaged with and slid in the axial slot 42 provided in the stopper member 41 fixed to the inner surface of the front intermediate body 33 in contact with the protrusion 43.

[0013]

Embodiments will be described with reference to FIGS. In FIG. 4, 31
Is a front body and 32 is a rear body. A plurality of intermediate cylinders 33 ... Are provided between them so that they can be folded in the middle. 34
Is attached between the front body 31 and the rear body 32 with a center-breaking jack, and the center-folding can be performed by expanding and contracting this.

As shown in FIG. 6, a plurality of center-folded jacks 34 and a plurality of shield jacks 35 attached to the rear body are alternately arranged on the circumference.

FIG. 7 shows the details of the intermediate barrels 33. Each of the intermediate barrels 33 has a stepped cylindrical shape (longitudinal cross section is Z-shaped) which overlaps each other at the stepped portion, and is superposed by the middle folding seal 36. The contact surface in the section is sealed. The bent portion of the intermediate body 33 serves as a receiving surface 37 during propulsion, and the tip surface of the mating intermediate body 33 serves as an abutting surface 38 during excavation, and both surfaces are abutted against each other for propulsion. 40 is the receiving surface 37 and the abutting surface 3 during expansion and contraction.
A spring plate that prevents dirt and sand from entering between 8 and 39
It is fixed near the receiving surface 37 by. A stopper member 41 is welded 44 to the inner surface of the intermediate body 33 and has an elongated hole 42 parallel to the axis. A guide projection 43 fixed to the inner surface of the overlapping intermediate cylinder 33 is fitted in the elongated hole 42. And the adjacent intermediate body 3
When 3 moves relatively, it is guided by the protrusion 43 and moves all the way.

[0016]

[Effect] Middle-breaking jack 3 on the opposite side of the bending direction
By extending 4 the adjacent intermediate barrels 33 relatively slide and extend, and the barrel becomes a curved state close to the desired radius of curvature. In this case, a device such as a space adjusting device (reference numeral 25 in FIG. 3) using a turnbuckle is not required in the intermediate barrel 33, and the operation is easy.

Unlike the known configuration of an inner ring and an outer ring, the front and rear intermediate cylinders are in close contact with each other when traveling straight ahead.
Since it is two cylinders, it has rigidity and is excellent in straightness. Even in the case of a super-curve construction with a radius of about 10 m compared with the conventional one, the end portion of the middle part of the body does not contact the inner surface of the excavation hole, and the smooth curve construction can be performed. Further, since the shape is considerably close to the radius of curvature, the overdug inside the curve is reduced as shown in FIG. 5, and the influence on the surrounding ground can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of a known machine.

FIG. 2 is a sectional view of the same curved state.

FIG. 3 is a detailed sectional view of a bending portion.

FIG. 4 is a cross-sectional view of a middle bent portion according to the present invention.

FIG. 5 shows a state during curve construction.

FIG. 6 is a cross-sectional view of a center-folded portion, showing an arrangement state of the center-folded jack and the shield jack.

FIG. 7 is a cross-sectional view showing a stopper at a middle bent portion.

FIG. 8 is a view on arrow A of FIG.

[Explanation of symbols]

1 Shield main body 2 Cutter head 3 Front body 4 Rear body 5 Curved part 6 Rotating shaft 7 Pressure partition wall 8 Bearing 9 Gear 10 Drive motor 11 Pinion 12 Cover body 13 Cutter tilting jack 14 Segment 15 Segment selector 16 Propulsion jack 17 Tilting jack 18,19A, 19B Ring body 20A, 20B Sliding surface 21 Seal material 22 Bracket 23 Turnbuckle 24 Screw rod 25 Spacing adjustment device 31 Front body 32 Rear body 33 Intermediate body 34 Center folding jack 35 Shield jack 36 Middle folding seal 37 Receiving surface 38 Abutting surface 39 Spring retainer 40 Spring plate 41 Stopper member 42 Welding 43 Protrusion

Claims (1)

[Claims] 1. A center-folding shield machine, wherein a multi-stage intermediate barrel (33) is used for the middle folding portion, and the intermediate barrel (33) has a stepped cylindrical shape in which the intermediate barrels (33) overlap each other at the step portion. The bent portion of the intermediate body (33) serves as a receiving surface (37) for propulsion, and the tip surface of the intermediate body (33) abuts against the receiving surface (37) of the front intermediate body (33) (3).
8) and on the inner surface of the bent portion of the intermediate body (33), a projection for guiding.
(43) is fixed and the intermediate body in front of which the protrusion (43) is in contact with
An intermediate shell of a multi-stage intermediate folding shield machine, which is adapted to slide by engaging with an axially elongated hole (42) provided in a stopper member (41) fixed to the inner surface of (33).