JP2837657B2 - Segment gripping mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gripping mechanism which is attached to a transport device such as an erector for transporting a segment in a shield machine in a circumferential direction and grips the segment.

[0002]

2. Description of the Related Art As is well known, in the shield method, while excavating the ground with a cutter device provided in front of a shield machine body having an external cylindrical shape, a segment which is a cylindrical divided body is excavated in the shield machine body. Assembling in the circumferential direction of the hole, further taking a reaction force at the front end of this segment and extending the propulsion jack inside the shield machine to propel the entire shield machine forward, repeating these steps to create a tunnel underground This is a construction method.

[0003] When the segment is to be carried into a tunnel under construction, for example, the segment is loaded on a bogie on the starting shaft side, and the bogie is pulled into the existing tunnel by a driving bogie and carried into the rear part of the shield machine. Perform unloading with a hoist crane or the like behind the shield machine, stock a certain amount of segments behind the shield machine, and transport the stocked segments to a place where they can be suspended by the hoist crane and gripped by the erector. I have to.

The erector transports the segment in a circumferential direction of a digging hole excavated by a shield machine. The segment conveyed by the erector is fixed to the inner wall side of the digging hole in an annular shape. I have. By the way, in order to transport a segment by the erector, a gripping tool is attached to the erector, and a hanging fitting to be gripped by the gripper is attached to the segment.

[0005] Conventionally, when the hanging fixture attached to the segment is gripped by the gripping tool, for example, the gripping tool is formed in a bracket shape and a hole is formed in the gripping tool. Form a hole in the upper end,
After matching the hole of the gripper with the hole of the hanging bracket,
By inserting pins into these holes, the gripper and the hanging metal are connected to each other.

[0006]

However, in order to match the holes of the gripping tool with the holes of the hanging fitting, an operator operates the erector while looking at these holes, or looks at these holes. Since the worker performs the hole alignment by giving a signal to the erector operator, this hole alignment work is extremely time-consuming, and after the hole alignment, the operator inserts pins into these holes and fixes them. Further, since the pins have to be pulled out after the segments are conveyed to a predetermined position, it takes time to insert and pull out such pins. Further, since the hole alignment operation and the pin insertion operation are performed while looking into the hole below the erector, not only does the operator have a considerable burden, but there is also a risk of being caught by the erector. Was.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a segment gripping mechanism that can easily, reliably and safely grip a segment.

[0008]

To achieve the above object, a segment gripping mechanism according to a first aspect of the present invention comprises a gripper attached to a transport device for transporting a segment, and a hanger attached to the segment. The head of the hanging fitting is inserted into the gripping body with the foot extending from the head and having a tip attached to the segment protruding from the gripping body. An opening for engaging the head of the hanging metal; and a head of the hanging metal when the head of the hanging metal is engaged with the engaging surface. And a departure prevention wall for preventing departure from the part from the outside.

[0009] As the transfer device to which the gripping body is attached, an erector that conveys the segments in the circumferential direction of the digging hole excavated by the shield machine, or a erector that suspends a certain amount of the stocked segments behind the shield machine. A hoist crane that conveys to a place where it can be gripped is exemplified.

[0010] As an example, the gripping body is formed in a cylindrical shape with the axis line extending in the horizontal direction, and a substantially lower half thereof is formed in a semicircular cross section, and the inner periphery of the semicircular portion is formed. A part of the surface is an engagement surface with which the lower surface of the head of the hanging fitting engages. Further, the holding body is not limited to such a configuration, and it is sufficient that the holding body has a space in which the head of the hanging fitting can be inserted and an engagement surface with which the head engages is formed.

[0011] As an example of the hanging metal fitting, as an example, the head is formed in a spherical shape, and the foot extending from the head is formed in a columnar shape having a smaller diameter than the head, and the lower end has a segment. A screw portion to be screwed into the formed screw hole is formed.
The hanging fitting is not limited to such a configuration, and its head may have any shape as long as it can be inserted into the gripping body, and if the foot extends from the head, Any shape may be used.

The opening formed in the gripping body includes, for example, a circular first opening having a diameter slightly larger than the head if the head of the hanging bracket is spherical, and a first opening having a circular shape. And a second opening for communicating the foot portion of the hanging metal fitting to the outside from the holding body. In addition, the opening is not limited to such a configuration, and the first opening may have any shape as long as it is large enough to insert the head of the hanging fitting.

[0013] The engaging surface is formed by, for example, an arcuate surface that engages with the head if the head of the hanging fitting is spherical.
The arc surface is formed on the inner lower surface side of the gripper, and the second opening is formed in the arc surface. Further, the engaging surface is not limited to such a configuration, and if the shape of the head is a shape other than spherical, it may be formed of a surface that engages with this shape. Alternatively, it may be formed on the side of the head of the hanging fitting inserted into the holding body.

The departure prevention wall is constituted by, for example, a wall of a gripper around an opening into which the head of the hanging bracket is inserted. For example, when the head of the hanging bracket is spherical,
The first opening of the opening is formed in a circular shape slightly larger in diameter than the head of the hanging fitting, and the head of the hanging fitting inserted from the first opening is positioned at the center of the first opening. A part of the head and the wall around the first opening when the first opening is viewed from the front,
Since they overlap with each other, the head of the hanging fitting cannot be deviated from the first opening to the outside.

In the segment gripping mechanism according to the first aspect, the gripping body is moved by the transport device, and the opening of the gripping body is moved to the position of the head of the hanging fitting attached to the segment. Then, the gripper is moved toward the head, and a head is inserted into the opening. Then, when the gripper is raised by the transport device, for example, the head of the hanging fitting engages with the engagement surface formed on the gripper, and the escape prevention wall prevents the head from deviating to the outside of the gripper. Become. Further, when the gripping body is lifted, the hanging fitting is lifted, and accordingly, the segment is lifted, that is, the segment is gripped and lifted.

After the gripped segment is conveyed to a predetermined position, the gripper is moved, the head of the hanging fitting is separated from its engaging surface, and the gripper is further moved. By ejecting the head of the hanging member from the opening of the holding body to the outside, the holding body and the hanging member are separated.

Therefore, in the above-mentioned gripping body, a hole matching operation between the hole of the conventional gripping tool and the hole of the hanging metal fitting, and
Since there is no need to insert and remove the pins into and out of these holes, the segments can be gripped easily, reliably and safely.

According to a second aspect of the present invention, there is provided the segment gripping mechanism according to the first aspect, wherein the gripping member is provided with a pressing means for pressing the head of the hanging member against the engaging surface. The pressing means is composed of, for example, a hydraulic jack, and a cylinder of the hydraulic jack is fixed to a holding body, and a head of the hanging fitting is pressed by a piston rod to be pressed against an engagement surface.

In the second aspect of the present invention, the head of the hanging member is pressed against the engaging surface by the pressing means, so that the head is firmly held between the pressing means and the engaging surface. . Therefore, even if the gripping body is rotated by the transport device, for example, the segment connected to the lower end of the foot of the hanging fitting can be reliably held and rotated.

According to a third aspect of the present invention, in the first or second aspect, the head of the hanging member is formed in a spherical shape, while the lower portion of the gripping member is formed in a semicircular cross section. A part of the inner peripheral surface of the arc-shaped portion is used as an engagement surface with which the lower surface of the head of the hanging fitting engages.

When the lower part of the gripping body is formed in a semicircular cross section, for example, the gripping body is formed in a cylindrical shape, and the lower part is formed in a semicircular cross section, that is, a semicylindrical shape. Then, the radius of curvature of the inner peripheral surface of the portion formed in a semicircular cross section is set to be substantially equal to or slightly larger than the radius of the spherical head of the hanging fitting. By using a part of the inner peripheral surface of the semicircular portion as the engaging surface, the head of the hanging fitting can be easily and reliably engaged with the engaging surface.

The first opening formed in the holding body is formed in a circular shape having a diameter slightly larger than the head of the hanging fitting, and the first opening is displaced downward from the center of the first opening. By setting the center of curvature of the engagement surface having a semicircular cross section, when the head of the hanging fitting inserted from the first opening engages with the engagement surface, a part of the head, When the first opening is viewed from the front, the wall surrounding the first opening overlaps with each other, so that the head of the hanging fitting cannot escape from the first opening to the outside.

According to a third aspect of the present invention, the opening of the holding body is aligned with the position of the head of the hanging fitting attached to the segment, and the head is inserted into the opening. Thereafter, when the gripper is lifted, the head is guided by the semicircular surface at the lower portion of the gripper, and is securely engaged with the engagement surface.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a segment gripping mechanism according to the present invention will be described below with reference to the drawings. FIGS. 1 and 2 are views showing the main part of a shield machine provided with a segment gripping mechanism according to the present invention. In these figures, reference numeral 1 denotes a segment gripping mechanism, and reference numeral 2 denotes an erector.

The erector 2 conveys the segment S in the circumferential direction of the digging hole excavated by the shield machine M, and is configured as follows. That is, as shown in FIG. 1, rotatable support rollers 4 are rotatably provided on the inner peripheral surface of the cylindrical shield machine main body 3 of the shield machine M. Is provided with a disk-shaped rotating body 5 rotatably supported by the rotation supporting rollers 4. The rotation center axis of the rotating body 5 is coaxial with the center axis of the shield machine main body 3, and the rotating body 5 is driven to rotate around the rotation center axis by a drive source (not shown).

A pair of arms 6, 6 protrude from the side surface of the rotating body 5, and bearings 7, 7 are fixed to tips of the arms 6, 6, respectively. Rods 8, 8 are slidably inserted in the bearings 7, 7 in the axial direction so as to be slidable in the axial direction.
Are hung over the rods 8, 8 and fixed. Hydraulic jacks 10, 10 are attached to the bearings 7, 7 via brackets 7a, 7a, and piston rods 10a, 10a of the hydraulic jacks 10, 10 are attached.
Is connected to the moving frame 9. Therefore, the movable frame 9 can reciprocate in the radial direction of the shield machine main body 3 while being supported by the rods 8, 8 by the expansion and contraction of the piston rods 10a, 10a.

A hydraulic jack 11 is provided below the moving frame 9 so that its axis is directed in the axial direction of the shield machine main body 3. A piston rod 11 a of the hydraulic jack 11 is attached to the moving frame 9. It is connected to. Therefore, the hydraulic jack 11 can reciprocate in the axial direction of the shield machine main body 3 by the expansion and contraction of the piston rod 11a. This hydraulic jack 11
The gripper 12 of the segment gripping mechanism 1 according to the present invention
Is attached, and the segment S is gripped by the gripping body 12. Further, as shown in FIG. 2, a pair of hydraulic jacks 13, 13 are attached to the moving frame 9 at positions sandwiching the hydraulic jack 11, and piston rods 13a, 13a of the hydraulic jacks 13, 13 are provided. Is extended, and the gripper 1 is extended.
By pressing against the segment S gripped by 2, the steady movement of the segment S is performed.

In the erector 2 having the above structure, the segments held by the holding body 12 are lifted by the hydraulic jack 10 through the moving frame 9 and then the rotating body 5 is rotated. The sheet is transported to a predetermined position in the circumferential direction of the shield machine main body 3.

Next, the segment gripping mechanism 1 according to the present invention
Will be described. That is, the segment gripping mechanism 1 includes the gripper 12 attached to the erector (transport device) 2 and the hanging metal 15 attached to the segment S.
And is configured roughly.

As shown in FIG. 3, the hanging bracket 15 comprises a spherical head 16 and a foot 17.
The foot portion 17 extends from the head portion 16 and includes a neck portion 17a, a nut portion 17b, a flange portion 17c, and a screw portion 17d formed in this order from the base end side.
On the other hand, a grout injection hole 18 is formed in the segment S. The grout injection hole 18 is for injecting grout for filling a gap between the annularly arranged segments 18 and the inner wall of the excavation hole, and a female screw portion is formed on the inner peripheral surface of the grout injection hole 18. The grout injection hole 18 has an annular sloping surface 18b formed at the entrance edge thereof.

The hanging bracket 15 has a foot 17
Screw part 17d of grout injection hole 18 into female screw part 18a
And the nut 17b is turned with a spanner or the like to tighten the flange 17c until the flange 17c comes into contact with the inclined surface 18b, whereby the nut 17b is attached to the segment S.

As shown in FIGS. 4 to 6, the gripper 12 has a cylindrical gripper body 20 having an axis oriented in a horizontal direction, and an axis line on the upper side of the gripper body 20. It comprises a cylindrical storage part 21 which stands upright in the vertical direction and stores a pressing means 30 described later. The gripper body 20 has a U-shaped tube portion 2 having a substantially U-shape in cross-section.
2 and a plate 23 for closing the upper opening of the U-shaped tube portion 22
In the center of the plate 23, a through hole 23a communicating with the storage section 21 is formed.

A substantially lower half of the U-shaped tube portion 22 is formed in a semicircular cross section. The radius of curvature of the inner peripheral surface of the semicircular portion 22a is equal to the spherical head of the hanging member 15. The radius is set to be substantially equal to or slightly larger than the radius of 16. Also,
An opening 24 for inserting the head 16 and the neck 17 a of the hanging member 15 into the U-shaped tube 22 is formed at the center of the side surface of the U-shaped tube 22. The opening 24 has a circular first opening 24 a having a diameter slightly larger than the head 16 of the hanging bracket 15, and communicates with the first opening 24 a below the first opening 24 a. Opening 2 formed by
4b. This second opening 24b is
This is for projecting the foot portion 17 of the hanging member 15 to the outside from the U-shaped tube portion 22, and has a diameter smaller than the head portion 16 of the hanging member 15 and larger than the neck portion 17 a of the foot portion 17. Is set to

The semicircular portion 2 of the U-shaped tube portion 22
The portion of the inner peripheral surface of the inner peripheral surface 2a facing the first opening 24a is an engaging surface 25 with which the lower surface of the head 16 of the hanging member 15 is engaged. The part 24b is open. The engagement surface 25 is provided on the semi-arc portion 2.
2a, the radius of curvature of the engaging surface 25 is substantially equal to or slightly larger than the radius of the spherical head 16 of the hanging member 15. The lower half of the head 16 engages closely.

The lower wall portion of the U-shaped tube portion 22 around the one opening 24a is connected to the head 16 of the hanging member 15.
Is engaged with the engagement surface 25,
Is a departure prevention wall 26 for preventing the head 16 from deviating from the first opening 24a to the outside. That is, the center of curvature of the engagement surface 25 (the center of the head when the head 16 of the hanging member 15 is engaged with the engagement surface 25) is shifted downward from the center of the first opening 24a. Position. Therefore, when the head 16 of the hanging member 15 inserted from the first opening 24a engages with the engagement surface 25, the deviation prevention wall 26 is located in front of the head 16. . Therefore, in this state, when the departure prevention wall 26 and the lower part of the head 16 of the hanging member 15 overlap each other when the first opening 24a is viewed from the front, the head 16 of the hanging member 15 is It is impossible to deviate from the first opening 24a to the outside.

The storage portion 21 has a cylindrical storage portion main body 27 whose lower end communicates with a through hole 23 a formed in the plate 23, and a plate 28 for closing an upper opening of the storage portion main body 27. And a pressing means 30 for pressing the head 16 of the hanging member 15 against the engaging surface 25 is provided in the housing portion main body 27.

The pressing means 30 is a hydraulic jack 30, and the base end of the hydraulic jack 30 is fixed to the plate 28. A pressing member 31 is provided at the tip of the piston rod 30a of the hydraulic jack 30. The pressing surface 31a on the distal end side of the pressing member 31 is formed in a concave hemispherical surface so as to engage with the head 16 of the hanging fitting 15, and the head is extended by extending the piston rod 30a. 16 to press the head 16 against the engaging surface 25.

In the pressing means 30 having the above structure, the head 16 of the hanging member 15 is pressed against the engaging surface 25 by the pressing surface 31a, so that the head 16 is in contact with the pressing surface 31a. And it is firmly pinched. Therefore, even when the gripper 12 is rotated by the erector 2, the head 16 of the hanging member 15 does not separate from the engagement surface 25, and the head 16 is firmly held on the engagement surface 15. Can be kept.

Next, a description will be given of a method of gripping the segment S by the segment gripping mechanism 1 having the above-described structure and transporting the segment S in the circumferential direction of the excavation hole by the erector 2. First, the gripping body 12 is moved up and down by the hydraulic jack 10 of the erector 2, and is attached to the center of the first opening 24a of the opening 24 and the segment S as shown in FIGS. The vertical position of the hanging bracket 15 with respect to the center of the head 16a is adjusted.

Next, the hydraulic jack 11 of the
As a result, the gripper 12 is horizontally moved to the head 12 side of the hanging bracket 15, and as shown in FIGS. 9 and 10, the first opening 24 a is formed in the gripper body 20 of the gripper 12.
Insert from. At this time, the neck portion 17a of the hanging fitting 12 is inserted into the grip body 20 through the second opening 24b.
Therefore, in this state, the head of the hanging metal fitting 15 holds the foot 17 within the gripper body 20 in the gripper body 20.
It is inserted in a state of being protruded from.

Next, the hydraulic jack 11 of the
As a result, the gripper 20 is slightly lifted (pulled up). Then, as shown in FIGS. 11 and 12, the head 16 of the hanging member 15 is relatively lowered and engages with the engaging surface 25 formed on the lower part of the grip body 20. In addition,
The head 16 engages with the engagement surface 25 and engages with the opening edge of the second opening 24b. When the head 16 of the hanging member 15 is engaged with the engagement surface 25, the deviation prevention wall 26 is located in front of the head 16 as shown in FIG. Cannot escape from the first opening 24a to the outside.

Next, as shown in FIGS. 13 and 14,
Piston rod 3 of the pressing means (hydraulic jack) 30
0a is extended, and the head 16 of the hanging member 15 is pressed downward by the pressing surface 31a of the pressing portion 31 attached to the tip thereof, whereby the head 16 is connected to the pressing surface 31a.
It is firmly held between the engagement surface 25 and the opening edge of the second opening 24b. In this manner, the head 1 of the hanging metal 15
By firmly holding the segment 6, the segment S attached to the foot portion 17 of the hanging bracket 15 can be securely grasped.

Next, as shown in FIG. 2, the piston rods 13a, 13a of the pair of hydraulic jacks 13, 13 are extended and pressed against the segment S gripped by the gripping body 12, whereby the segment S is pressed. Perform steady rest. Next, after the gripping body 12 is further pulled up by a predetermined amount by the hydraulic jack 10 of the erector 2, the rotating body 5 of the erector 2 is rotated to move the gripped segment S to a predetermined position in the circumferential direction. It is transported and fixed at a predetermined position.

After the segment S is fixed, the piston rod 30a of the hydraulic jack 30 is reduced, and the pressing surface 31a is separated from the head 16 of the hanging bracket 15,
After releasing the holding of the head 16, the gripper 12 is moved by the hydraulic jack 10 of the
6 is separated from the engagement surface 25, and furthermore, the gripper 12 is moved by the hydraulic jack 11 of the erector 2, and the head 15 is discharged to the outside from the first opening 24 a of the gripper 12. Then, the holding body 12 and the hanging bracket 15 are separated.

As described above, the segment gripping mechanism 1 of this embodiment
Then, since it is not necessary to perform the hole alignment work between the hole of the conventional gripping tool and the hole of the hanging metal fitting, and the insertion and withdrawal of the pin into and out of these holes, the segment can be easily, reliably and safely gripped. be able to.

FIGS. 15 and 16 show another embodiment of the segment gripping mechanism of the present invention. The segment gripping mechanism 40 of the present example is attached to a hoist crane that hangs a segment stocked in a fixed amount behind the shield machine and transports the segment to a position where it can be gripped by an erector. Accordingly, in the segment gripping mechanism 40 of this example, the gripped segment S is not required to be transported in the horizontal direction and the vertical direction, and need not be rotated and transported. , The pressing means 30 is not provided.
In addition, in the segment gripping mechanism 40 of the present example, since the hanging fittings constituting the same have the same configuration as the above-mentioned hanging fitting 15, the description thereof will be omitted, and the configuration of the holding body 41 will be described below.

That is, the gripping body 41 is composed of a gripping body main body 42 and a hanger 43 attached to an upper portion of the gripping body 42 via a bracket 43a. The gripping body 42 is formed by opening approximately one-fourth of a cylindrical body having an oblong cross section, and a substantially lower half thereof is formed in a semicircular cross section. The radius of curvature of the inner peripheral surface of the portion 42a is set to be substantially equal to or slightly larger than the radius of the spherical head 16 of the hanging fitting 15.

An opening 44 for inserting the head 16 and the neck 17a of the hanging member 15 is formed in the center of the side surface of the grip body 42. This opening 44
Is a circular first opening 44 slightly larger in diameter than the head 16.
a of the first opening 44a below the first opening 44a.
and a second opening 44b formed so as to communicate with a. The second opening 44b is for allowing the foot 17 of the hanging member 15 to protrude from the grip body 42 to the outside.
The diameter is set to be smaller and larger than the neck 17a of the foot 17.

A portion of the inner peripheral surface of the semicircular portion 42a facing the first opening 44a is an engaging surface 45 with which the lower surface of the head 16 of the hanging member 15 is engaged. The second opening 44b is opened in the engagement surface 25. Since the engaging surface 45 is a part of the inner peripheral surface of the semicircular portion 42a, the radius of curvature of the engaging surface 25 is substantially equal to or slightly larger than the radius of the head 16 of the hanging member 15. Therefore, the lower half of the head 16 is closely engaged with the engagement surface 45.

The lower wall portion of the grip body 422 around the opening 44 a is provided when the head 16 of the hanging member 15 is engaged with the engaging surface 25. A departure prevention wall 46 is provided to prevent the head 16 of the metal fitting 15 from deviating from the first opening 44a to the outside. That is, the center of curvature of the engagement surface 45 (the hook 15
(The center of the head when the head 16 is engaged) is set at a position shifted downward from the center of the first opening 44a. Therefore, when the head 16 of the hanging member 15 inserted from the first opening 44a engages with the engagement surface 45, the deviation prevention wall 46 is located in front of the head 16. . Therefore, in this state, the deviation prevention wall 46 and the lower part of the head 16 of the hanging bracket 15 are in the first position.
When the openings 44a are viewed from the front, they overlap with each other, so that the head 16 of the hanging member 15 is
It is impossible to deviate from a to the outside.

The holding body 41 having the above structure is moved in the horizontal direction and the vertical direction by attaching the hanging tool 43 to the hanging wire of the hoist crane.
When a segment is gripped by the gripping body 41, the hoist crane is operated to move the gripping body 41 in the horizontal direction and the vertical direction, so that the gripping body is moved in the same manner as in the first embodiment. The operation is performed by inserting the hanging metal 15 through the opening 44 of the 41 and engaging the head 16 of the hanging metal 15 with the engaging surface 45. Therefore,
Also in this example, since it is not necessary to perform the hole alignment work between the hole of the conventional gripping tool and the hole of the hanging bracket, and the insertion and removal of the pin into and out of these holes, the segments can be easily and securely and safely. Can be grasped.

[0052]

As described above, according to the first aspect of the present invention,
The segment gripping mechanism has a gripper attached to the transport device, and a suspender attached to the segment, the gripper has an opening for inserting the suspender into the gripper, An engaging surface that engages with the head, and a deviation prevention that makes it impossible for the head of the hanging metal to deviate from the opening to the outside when the head of the hanging metal is engaged with the engaging surface. Since the wall and the wall are formed, the segment can be gripped through the hanging metal by inserting the head of the hanging metal into the holding body through the opening and engaging the engaging surface. Therefore, since it is not necessary to perform the hole alignment work between the hole of the conventional gripper and the hole of the hanging metal fitting, and the insertion and withdrawal of the pins into these holes, it is possible to easily and surely and securely grip the segment. it can.

According to a second aspect of the present invention, there is provided a segment gripping mechanism according to the first aspect, wherein the gripping body is provided with a pressing means for pressing the head of the hanging member against the engaging surface. By pressing the head of the hanging fitting against the engaging surface, the head can be firmly held between the pressing means and the engaging surface. Therefore, even if the gripping body is rotated by the transport device, for example, the segment connected to the lower end of the foot of the hanging fitting can be reliably held and rotated.

According to a third aspect of the present invention, in the first or second aspect, the head of the hanging member is formed in a spherical shape, while the lower portion of the holding body is formed in a semicircular cross section. Since a part of the inner peripheral surface of the arc-shaped portion is an engagement surface with which the lower surface of the head of the hanging fitting engages, after inserting the head of the hanging fitting into the opening of the gripping body, When the grip is lifted, the head is guided to the lower semicircular surface of the grip so that the head can be securely engaged with the engagement surface.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a main part of a shield machine provided with a segment gripping mechanism according to the present invention.

FIG. 2 is a cross-sectional view showing a main part of a shield machine provided with a segment gripping mechanism according to the present invention.

FIG. 3 is a front view showing an example of a segment gripping mechanism of the present invention, showing a hanging metal fitting and a segment to which the hanging metal fitting is attached.

FIG. 4 is a plan view of the same gripper.

FIG. 5 is a front view of the same gripper.

FIG. 6 is a side view of the same gripper.

FIG. 7 is a side view showing a state before the head is inserted into the holding body.

FIG. 8 is a front view showing a state before the head is inserted into the gripping body.

FIG. 9 is a side view showing a state where the head is inserted into the holding body.

FIG. 10 is a front view showing a state where the head is inserted into the gripping body.

FIG. 11 is a side view showing a state where the head inserted into the gripping body is engaged with the engaging surface.

FIG. 12 is a front view showing a state where the head inserted into the gripping body is engaged with an engagement surface.

FIG. 13 is a side sectional view showing a state in which the head inserted into the gripping body is pressed by the pressing means.

FIG. 14 is a front cross-sectional view showing a state where the head inserted into the holding body is pressed by a pressing unit.

FIG. 15 is a front view of a gripping body, showing another example of the segment gripping mechanism of the present invention.

FIG. 16 is a side view of the grip body.

[Explanation of symbols]

 1,40 Segment gripping mechanism 15 Hanging bracket 16 Head 17 Foot 24,44 Opening 25,45 Engagement surface 26,46 Departure prevention wall

Claims (3)

(57) [Claims] 1. A gripping mechanism for gripping a segment when transporting the segment in a shield method, comprising: a gripper attached to a transport device for transporting the segment; and a hanger attached to the segment. In order to insert the head of the hanging fitting into the holding body, the head extending from the head and having a tip attached to the segment projected from the holding body. Opening, an engaging surface that engages with the head of the hanging fitting, and when the head of the hanging fitting is engaged with the engaging surface, the head of the hanging fitting is connected to the opening. And a departure prevention wall for preventing departure from the outside. 2. The segment gripping mechanism according to claim 1, wherein said gripping member is provided with a pressing means for pressing a head of said hanging metal member to said engaging surface. . 3. The segment gripping mechanism according to claim 1, wherein a head of the hanging member is formed in a spherical shape, and a lower portion of the gripping member is formed in a semicircular cross section, and the semicircular portion is formed. A part of the inner peripheral surface of the segment is formed as an engaging surface with which the lower surface of the head of the hanging fitting engages.