JPH0823272B2 - Shield segment gripping device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield segment gripping device in a shield construction method.

[0002]

2. Description of the Related Art Conventionally, in assembling a shield segment, a grip hole for backfill injection provided in the segment has been used to grip the segment. In this method, first of all, prior to the assembly of the segment, the segment hanging metal object is screwed into the screw part of the ground hole,
The connecting pin is inserted into the pin hole provided in the metal object so as to be gripped by the assembling device, that is, the erector. After the assembly is completed, the connecting pin is removed from the segment and diverted.

In this conventional technique, when the segment is large, the hanging object becomes large and heavy, and it is difficult and dangerous to attach and detach it to the segment. In addition, a large moment is generated in the threaded portion of the ground hole, which requires a high-strength segment.

On the other hand, in Japanese Utility Model Laid-Open No. 62-50300, a box through hole penetrating inward and outward is provided at the center of a segment, and a plate having a circular hole embedded in the box hole is more than a plate having a tap hole. Is also located on the inner surface side, and on the surface of the plate having a circular hole, an engaging metal member having a notch through which the gripping rod of the erector and the locking portion of the gripping rod end can be integrally provided, There is disclosed a technique in which a gripping bar is rotated after inserting a portion, an engaging metal piece is locked by a locking portion, and a segment is gripped with one touch and without requiring input.

However, in this known technique, since the segment is supported only by the engaging portion of the gripping bar, a large moment acts on the gripping bar, and a means for preventing the swinging at the time of turning the segment is required, and the structure is It is complicated and has a large outer shape and weight.

For this reason, the present applicant has filed Japanese Patent Application No. 1-2552.
No. 03 No need for segment hanging hardware,
We proposed a compact, lightweight gripping device that prevents moments from acting on the gripping part and has a simple structure.

However, in such a technique, there is usually no problem, but when the grip body is inserted at an angle when it is inserted into the grip hardware, there is a risk of partial contact and partial overload.

[0008]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a gripper that is inserted with a tilt for some reason.
An object of the present invention is to provide a gripping metal object for a shield segment that can be appropriately gripped without causing partial overload.

[0009]

According to the present invention, a gripping body that is reciprocally and rotatably provided on a base body is inserted into a gripping hardware embedded in a shield segment to selectively engage the gripping hardware. In the gripping device of the shield segment, the gripping body is pulled up, the friction pad fixed to the base is pressed against the segment, and the segment is gripped by the friction due to the pressing force. And a protrusion that is connected to the jack and is inserted into the slit and that faces the inner surface of the flange portion of the lumen that is embedded in the shield segment at the rotating position, the flange portion side of the protrusion being the inner surface of the plunger. And a friction pad fixed to the base body and facing the inner peripheral surface of the segment. Slit gripping hardware inserting the bearing member is inclined.

[0010]

In the gripping device for the shield segment constructed as described above, the jack of the gripping device is extended, the gripping body is inserted into the inner cavity through the slit of the gripping metal fitting, and the jack is rotated 90 ° and then the jack is rotated. When is contracted, the protrusion locks the inner surface of the flange portion, the segment is pulled up via the gripping hardware, and the friction pad presses the inner peripheral surface of the segment. Therefore, the friction is reliably gripped by the segment.

Even when the gripping body is inserted with an inclination with respect to the axis of the gripping metal piece, the insertion work is smoothly performed by the inclination of the slit, and the spherical surface of the gripping body pulls the gripping body against the inner surface of the flange portion. Sometimes it will be self-aligning.

Therefore, only a pulling force acts on the gripping body, and no moment acts.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show an apparatus for carrying out the present invention, and a gripping apparatus generally designated by reference numeral 1 is attached to the tip of an unillustrated assembly apparatus.

This gripping device 1 is provided with a trapezoidal bracket 2 as a base body, and a friction pad 3 having the same shape as the inner peripheral surface of the segment S is fixedly provided on the segment S side of the bracket 2. . On both sides of the center line of this bracket 2, a pair of jacks 4 and 4 are provided at 90 °.
The jacks 10 are provided so as to be reciprocally rotatable within the range, and the gripping pins 10 as gripping bodies are connected to the operating ends of the jacks 4 and are covered with the outer cylinder 5.

On the other hand, the segment S has a gripping pin 1
The gripping hardware 20, 20 is embedded at a position facing 0, 10.

In FIGS. 3 to 7, the gripping hardware 2 is shown.
In the case of 0, a cylindrical portion 23 is formed continuously with the bottom flange portion 21 closed by the disc 22, and an inner cavity 24 of the cylindrical portion 23 is formed.
Is covered with a thick flange portion 25. A linear slit 26 is formed in the flange portion 25, an inclined portion 25a is formed at the inner edge portion of the flange portion 25, and an inner surface 25b on the inner cavity 24 side is formed as a partial spherical surface.

On the other hand, the gripping pin 10 is continuous with the guide portion 11 having four trapezoidal slopes at the tip, and the slit 2
The protrusion 1 formed by the plate-shaped portion 12 having a width slightly narrower than the width of 6
3 and 13 are provided, and the shoulder portions 14 and 14 for locking the flange portions 25 of the protrusions 13 and 13 are formed in a partial spherical surface. Then, the shaft portion 15 continuous with the plate-shaped portion 12
Are extended upward and are connected to the working end of the jack 4 by the screw portion 16. Reference numerals 2a and Sa in the drawing are guide tapered surfaces formed so as to face the bracket 2 and the segment S.

As shown in FIG. 8, the pulling force of the jack 4 and the contact area of the friction pad 3 with the segment S are as shown in FIG. It is determined for the condition that the force H is at its maximum, that is to say the weight of the segment S.

Here, the weight of the segment S is, for example, 7.
4 tons, the required pressing force F against the segment S1 is, for example, 12 tons, and the friction coefficient μ between the friction pad 3 and the segment S is, for example, 0.4, the required pulling force P by the jack 4 of the segment S is P> (H + F) /
μ, and in the above example, P requires 48.5 tons or more.
Therefore, in consideration of safety, P = 70 tons, and the contact area A of the friction pad 3 is determined so that P / A, that is, the average surface pressure becomes a preferable value.

When gripping the segment S, the assembling apparatus is operated to hold the gripping apparatus 1 through the guide tapered surfaces 2a and Sa.
The pad 3 of the
The 10 is made to face the gripping hardware 20, 20.

Next, the jacks 4 and 4 are extended, and the guide portion 11 and the plate-like portion 12 of each gripping pin 10 are inserted into the inner cavity 24 through the slit 26 of the metal object 20.

Next, the jack 4 is rotated 90 ° so that the shoulders 14, 14 of the protrusions 13, 13 face the lower surface of the flange 25.

Next, the jacks 4 and 4 are shortened and the segment S is pulled up by the gripping pins 10 and 10, the friction pad 3 is pressed against the inner peripheral surface of the segment S, and the gripping device 1 is operated by the friction due to the pressing force P. Hold the segment S. At this time, the gripping pin 10 is connected to the gripping hardware 20.
Even if it is inserted diagonally into the slit 26 of the shoulder 14,
Since it is formed as a partial spherical surface that engages with the inner surface 25b of the flange portion 25, the segment S can be self-aligned and the segment S can be pulled straight, and the surface pressure of the engaging portion is small.

Thereafter, the assembling apparatus is operated, and the segment S is pivotally moved to a predetermined position and assembled in accordance with a known assembling mode.

[Effects of the Invention] Since the present invention is configured as described above, it is possible to omit the segment hanging metal object and prevent only the tensile force from acting on the gripping pin and the moment. You can

Further, the segment can be pulled straight up by automatically aligning the grasping pin and the grasping hardware.

Further, the gripping device can be made simple in structure, lightweight and compact.

[Brief description of drawings]

FIG. 1 is a front view showing an example of a gripping device embodying the present invention.

FIG. 2 is a view on arrow A in FIG.

FIG. 3 is a front sectional view showing a main part.

FIG. 4 is a top view showing slits of a gripping object.

FIG. 5 is a front view of a gripping pin.

FIG. 6 is a side view of the gripping pin.

FIG. 7 is a bottom view of the gripping pin.

FIG. 8 is a front view illustrating a state of a force that acts on a segment during assembly.

[Explanation of symbols]

 1 ... Gripping device 2 ... Bracket 3 ... Friction pad 4 ... Jack 10 ... Gripping pin 12 ... Shaft part 13 ... Projection part 14 ... Shoulder part 20 ... Gripping hardware 24 ... Lumen 25 ...... Flange part 25b …… Inner surface 26 …… Slit

Continuation of the front page (56) References JP-A-3-255203 (JP, A) Actually opened 60-58698 (JP, U) Actually opened 60-195400 (JP, U)

Claims (1)

[Claims] 1. A gripping body that is reciprocally and rotatably provided on a base body is inserted into a gripping metal article embedded in a shield segment, and the gripping metal article is selectively locked, and the gripping body is pulled up. In a gripping device for a shield segment that presses a friction pad fixedly mounted on a base body onto the segment and grips the segment by friction due to the pressing force, a jack rotatably provided on the base body, and a jack connected to the jack. It is provided with a projecting portion that is inserted into the slit and faces the inner surface of the flange portion of the lumen that is embedded in the shield segment at the rotating position, and the flange portion side of the projecting portion is formed into a partial spherical surface that engages with the inner surface of the plunger. And a friction pad that is fixed to the base body and faces the inner peripheral surface of the segment. Gripping device of the shield segments which is characterized in that it is inclined.