JP3149423B2 - Half-fold shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention comprises a front trunk and a rear trunk,
The present invention relates to a half-fold shield excavator in which the front and rear bodies are flexibly connected.

[0002]

2. Description of the Related Art A conventional half-fold shield machine has a seal mechanism for sealing a gap between overlapping portions of a front trunk and a rear trunk. A shield machine equipped with such a sealing mechanism is described in, for example, Japanese Utility Model Laid-Open No. 3-30459. As another example of the sealing mechanism, there is also known one in which a gap is not generated in a portion where the front body and the rear body overlap, and a method of processing the inner cylinder in that case is shown in FIG. In FIG. 12, reference numeral 1 denotes a front body, and a portion overlapping the rear body 2 is an outer cylinder. The rear trunk 2 is an inner cylinder at a portion where the front trunk and the rear trunk overlap. Reference numeral 3 denotes a curved surface portion of the rear trunk 2. The curved surface portion 3 is formed into a cylindrical shape with a cylindrical processing radius r. The cylindrical processing radius r increases and decreases in the axial direction corresponding to a curved surface processing radius R about the bending center Q of the front body 1 and the rear body 2.

When the shield machine machined by the method shown in FIG. 12 is bent so that the bending center Q is outside the inner cylinder,
FIG. 13 shows a portion where the front trunk and the rear trunk overlap.

[0004]

FIG. 14 shows a cross section of the seal position in the bent state of FIG. At the upper and lower positions in FIG. 14, the gap amount is constant irrespective of the bending angle, as shown as one gap. However, at the left and right positions in the figure, the gap 2
The gap amount of the portion increases with bending. That is, the gap amount between the inner cylinder and the outer cylinder changes greatly in the circumferential direction of the seal position. Earth and sand that can cope with a change in the gap amount of the gap 2 in order to prevent earth and sand outside the shield from entering the inside of the shield from such a gap between the inner cylinder and the outer cylinder, and to seal earth and water, etc. A seal 50 must be provided. In particular, if there is a relative movement of the inner cylinder and the outer cylinder in the direction C in FIG. 14 with respect to the cross section BB, the earth and sand sealing device 50 needs to be large.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a compact half-fold shield excavator with a simple earth and sand sealing device.

The present invention further suppresses the relative movement of the inner cylinder and the outer cylinder in the direction perpendicular to the center axis of the center folding type shield excavator, so that the shield jack, the center folding jack, the screw conveyor, the feeding and discharging mud are provided. Pipe hose, cable, etc.
The protection of the equipment placed over the rear trunk, peripheral equipment,
It is intended to prevent interference with a structure.

[0007]

According to the present invention, there is provided a rear body.
A curved surface provided at the end of the inner cylinder,
A seal member provided on the front body so as to slide in contact with a part
Having a part of the seal member as a bending center Q
A mid-fold shield machine that bends the torso
And the outer surface of the curved surface portion corresponds to the center point O of the cylinder end portion.
Around the bending center Q around the ₁ to the circumferential direction of the radius r ₁ and
By the curved surface obtained by the axial radius R
And forming a part of the curved surface portion with the radius r ₁ .
It has eccentricity ε from the center point O _1, yet the center point O ₁
Ri distance to the curved surface less than the radius r _1, and peripheral
And wherein this <br/> and formed with a curved surface of radius r ₂ which changes the direction and the axial direction.

Another feature of the present invention is that a convex portion is provided on a rolling stopper for preventing relative rotation of the front and rear bodies of the shield machine around the central axis, so that the interference of the seal is constant. It is in.

[0009]

According to the present invention, since the curvature of the outer peripheral surface of the curved surface portion of the inner cylinder is different between the bending axis direction and the direction perpendicular thereto,
Changes in the amount of clearance between the outer cylinder and the inner cylinder are reduced. That is, the amount of the gap between the inner cylinder and the outer cylinder is substantially the same when the shield machine is bent as when it is not bent. further,
The amount of clearance between the inner cylinder and the outer cylinder does not increase even at the rolling stopper portion that prevents relative rotation of the front trunk and the rear trunk about the central axis.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a side sectional view showing a schematic configuration of a center folding type shield machine according to the present invention. FIG. 2 is a sectional view taken along line AA of FIG.
FIG. 3 is a view showing a case where the center-folding type shield machine shown in FIG. 1 is bent.

In FIG. 1, reference numeral 1 denotes a front body, and an outer cylinder is provided at a portion overlapping the rear body 2. The rear trunk 2 is an inner cylinder at a portion where the front trunk and the rear trunk overlap. Reference numeral 3 denotes a curved surface portion provided on the rear trunk 2. Reference numeral 4 denotes a rolling stopper that prevents relative rotation of the front trunk and the rear trunk about the central axis, and is provided on the front trunk 1. Reference numeral 5 denotes a rolling stopper receiver, which is provided on the rear trunk 2.

A shield jack 6 and a center folding jack 7 are arranged in the overlapping portion of the front trunk 1 and the rear trunk 2. ,
The shield jack 6 is used to propel the shield machine. The center folding jack 7 is used for bending the shield machine. The shield machine having such a configuration takes the bending center Q at a predetermined point outside the inner cylinder and bends around the bending center Q.

In the present invention, the outer surface of the curved surface 3 of the rear body 2 is shown in FIGS. 4 to 4 in order to increase the clearance due to bending, that is, to reduce the clearance between the inner cylinder and the outer cylinder from the conventional clearance. Processing is performed as shown in FIG. First, a cylindrical machining radius r1 around O ₁
Then, the outer periphery of the curved surface portion 3 is machined, and then the center O ₁ is decentered (retracted) by ε by O ₂ as the machining center and the cylinder machining radius r ₂ (r ₂ −ε <r ₁ ). Process a part. In other words, a distance r _{2 in} a line PP direction orthogonal to the center axis of the rear trunk and the center axis of bending from the center O ₁ of the curved surface portion 3 to the outer periphery.
-Ε is made shorter than the radius r _{1 in} a direction perpendicular to this.
R is continuously changed between the processing radius r ₁ and the processing radius r ₂ . In FIGS. 5-6, a white portion indicates a region outer surface processing areas, hatched portions in the radius r ₁ is that processing is given retracted a shorter working radius of the cylinder.

As shown in FIG. 7, the longitudinal direction of the curved surface portion 3 is processed with a curved surface processing radius R around a bending center Q immediately outside the inner cylinder. Therefore, the size of the cylindrical processing radius r changes in the axial direction so as to match the curved surface processing radius R. In summary, the outer surface of the curved surface portion 3 has a longitudinally curved surface radius R centered on the bending center Q, and the cylindrical radius r is a line P perpendicular to the bending central axis and the central axis of the rear trunk. −
It changes depending on the angle from P, and the cylinder radius r changes along the axial direction of the curved surface portion.

By processing the outer periphery of the curved surface portion 3 of the inner cylinder as described above, the gap 1 between the inner cylinder and the outer cylinder is the same as the conventional one, and the gap 2 is smaller than the conventional one. That is, when the shield machine is bent around the bending center Q, the gap amount between the inner cylinder and the outer cylinder is the same as when the bend is not bent. Alternatively, the change in the gap amount is reduced. Therefore, a small earth and sand seal can be used.

The movement in the direction C shown in FIG. 14 is performed by using the rolling stopper 4 and the rolling stopper receiver 5 for preventing relative rotation of the front body and the rear body about the central axis, as shown in FIGS.
By setting it as 1, it can be prevented. 8 is a side view of the rolling stopper, FIG. 9 is a plan view of the rolling stopper, and FIG. 10 is a rear view. FIG. 11 is a sectional view of the rolling stopper receiver 5.

In this embodiment, the rolling stopper 4 for preventing relative rotation of the front body and the rear body about the central axis is provided with a rolling stopper 4 for preventing the gap amount between the inner cylinder and the outer cylinder from increasing. The tip portion is thinned, and a pair of convex portions 40
Is provided. The movement in the direction C can be prevented by the projection 40 and the rolling stopper receiver 5. That is, by suppressing the relative movement of the inner cylinder 2 and the outer cylinder 1 in the C direction by the rolling stopper 4, no extra force acts on the earth and sand sealing device. This also protects equipment such as shield jacks, center jacks, screw conveyors, hoses for sending / discharging pipes, cables, etc., which are arranged over the front and rear bodies, and prevents interference with peripheral devices and structures. be able to.

[0018]

According to the present invention, when the shield machine is bent with the center of bending outside the inner cylinder, the clearance between the inner cylinder and the outer cylinder is equal to or equal to that when the shield is not bent. Therefore, it is possible to provide a compact mid-fold shield excavator with a simple earth and sand sealing device.

According to the present invention, since the rolling stopper is processed so as not to increase the gap between the inner cylinder and the outer cylinder, the relative movement of the inner cylinder and the outer cylinder in the half-fold shield excavator is suppressed. By doing so, it is necessary to protect shielded jacks, middle jacks, screw conveyors, hoses for sending / discharging pipes, cables, etc., which are placed over the front and rear trunks, and to prevent interference with peripheral devices and structures. Can be.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a main part of a shield machine according to an embodiment of the present invention.

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

FIG. 3 is a side sectional view of a main part when the shield machine shown in FIG. 1 is bent in the middle.

FIG. 4 is a front view of a curved portion of the inner cylinder of FIG. 1;

FIG. 5 is a side view of FIG.

FIG. 6 is a plan view of FIG. 4;

FIG. 7 is a view showing a longitudinal section of the curved surface portion of FIG. 1;

FIG. 8 is a side view of the rolling stopper of FIG. 1;

FIG. 9 is a plan view of a rolling stopper.

FIG. 10 is a rear view of the rolling stopper.

FIG. 11 is a sectional view of a rolling stopper receiving portion of the shield machine shown in FIG. 1;

FIG. 12 is a view showing a method of processing an inner cylinder of a conventional center-fold type shield machine.

FIG. 13 is a view showing a portion where the front trunk and the rear trunk of FIG. 12 overlap.

FIG. 14 is a view showing a cross section at a sealing position in FIG. 13;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Front trunk, 2 ... Rear trunk, 3 ... Curved surface part, 4 ... Rolling stopper, 5 ... Rolling stopper receiver, 6 ... Shield jack, 7 ... Middle folding jack

Continuation of front page (56) References JP-A-6-117177 (JP, A) JP-A-8-144689 (JP, A) JP-A-7-217370 (JP, A) JP-A 7-150887 (JP) JP-A-5-106390 (JP, A) JP-A-5-57088 (JP, U) JP-A-64-37595 (JP, U) JP-A-4-73086 (JP, U) Surveyed fields (Int. Cl. ⁷ , DB name) E21D 9/06 301

Claims (2)

(57) [Claims] 1. A seal member comprising: a curved surface portion provided at a tube end portion of an inner cylinder constituting a rear body; and a seal member provided on a front body so as to slidably contact a part of the curved surface portion. in break-action shield machine to bend relative to the rear cylinder to the front torso of a portion as a bending center Q, the outer surface of the curved portion, the circumferential direction of the radius around the center point O ₁ of the cylindrical end portion r ₁ and a curved surface obtained by an axial radius R about the bending center Q. A part of the curved surface portion is formed with an eccentricity ε from a center point O ₁ of the radius r _1. has, moreover break-action shield, characterized in that the distance to the curved surface than the center point O ₁ is formed by the shorter than the radius r _1, and the radius r ₂ which varies in the circumferential direction and the axial curved surface Machine. 2. The rolling stopper according to claim 1, wherein the rolling stopper for preventing relative rotation of the front body and the rear body about a central axis is provided.
A half- fold shield excavator characterized in that a convex portion is provided so that a tightness of a seal is constant, and a gap amount between the inner cylinder and the outer cylinder is not increased.