JPH082234Y2 - Gripper device for tunnel machine - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a gripper device for taking a propulsive reaction force of a self-propelled tunnel excavator.

[Conventional technology]

When the tunnel construction is carried out in the soil where the ground is self-sustaining, it is not necessary to use the segment for stabilizing the tunnel, and the support work is used. In this support work, a reaction force of the tunnel machine is not obtained. Therefore, a method of using a gripper device and applying a reaction force to the gripper device to propel the tunnel machine is adopted. There are two types of gripper devices, one that is built into the excavator body and the other that is separately placed behind the excavator body, but here we will describe the one that is separately placed at the rear. Are the same).

In FIGS. 8 to 10, 1 is an excavator body, 2 is a cutter head for excavating a face, 3 is a propulsion jack built in the body 1, and 4 is a gripper device. The gripper device 4 is composed of a gripper frame 5, an upper gripper shoe 6, a lower gripper shoe 7, and a gripper jack 8. When the propulsion device is to be advanced, the gripper jack 8 is extended to move the gripper shoes 6 and 7 from inside the tunnel. The gripper device 4 is fixed in the tunnel by pressing it against the natural ground 9 (Fig. 8). Then, a reaction force is applied to the gripper device 4, the propulsion jack 3 is extended, and the excavator body 1 is advanced (FIG. 9).
After excavating for one stroke, the gripper jack 4 is contracted to separate the gripper shoes 6 and 7 from the ground 9, thereby freeing the gripper device 4, and at the same time when the propulsion jack 3 is contracted, the gripper device 4 is pulled toward the excavator body 1. . Reference numeral 10 denotes a connecting member interposed between the gripper frame 5 and the rod end portion of the propulsion jack 3.

[Problems to be solved by the device]

Since the gripper device is a device for taking a reaction force of the tunnel excavator, it must be firmly fixed to the ground. For this purpose, the thrust of the gripper jack 8 must be made as large as possible.
If the contact area of 6, 7 with respect to the ground 9 is small, the ground contact pressure becomes excessive and the ground 9 is destroyed, which is not preferable in terms of ground stability. Therefore, the gripper shoes 6, 7
The ground contact area is required so as not to damage the natural ground 9 by the natural surface pressure. On the other hand, since the crushed earth and sand adheres to the inside of the natural ground 9 as it is or the earth and sand that has dropped during excavation accumulates, the ground surface of the original natural ground 9 and the gripper shoes 6, 7 is These earth and sand will be intervened between. This intercalated sand 11 (Fig. 10) is generally soft, and soil particles tend to slip.

In the conventional gripper device, the entire grounding surface of the gripper shoes 6, 7 is a single smooth surface. Therefore, when the grounding area is increased, even if the thrust is applied by the gripper jack 8,
The intervening earth and sand 10 could not be pushed out between the ground 9 and the gripper shoes 6 and 7, and as a result, the gripper device 4 was insufficiently fixed, and when the propulsion reaction force was applied, the gripper device 4 slipped and advanced. Sometimes the aircraft couldn't move forward.

In view of the above situation, the present invention aims to prevent slipping of the gripper device by eliminating the intervening earth and sand between the gripper shoe and the ground.

[Means for solving the problem]

In order to achieve the above object, the gripper device for a tunnel excavator according to claim 1 is provided with a groove for removing earth and sand reaching the outer periphery of the grounding surface of the gripper shoe.

Further, in the gripper device of the tunnel excavator according to the second aspect of the invention, instead of the groove of the first aspect of the invention, the grounding surface of the gripper shoe is provided with a hole for removing sand which penetrates to the back side.

[Action]

In the gripper device according to claim 1, since the ground contact surface of the gripper shoe is partitioned by the groove and subdivided,
When the gripper shoe is pressed against the natural ground, the intervening sand is likely to be pushed out. The earth and sand pushed out into the groove is removed to the outer peripheral side of the gripper shoe through this groove.

In the gripper device described in claim 2, since the grounding surface of the gripper shoe has a hole, when the gripper shoe is pressed toward the natural ground, the moving distance of the intervening earth and sand is shortened and the intervening earth and sand is pushed out. Cheap. The earth and sand extruded into the hole is discharged to the back side of the gripper shoe through this hole.

〔Example〕

1 to 5 show a first embodiment of the present invention corresponding to claim 1.

The gripper frame 5 of the gripper device is configured by connecting front and rear circular frames 5a and 5b with left and right body portions 5c and 5d. The upper gripper shoe 6 and the lower gripper shoe 7, which are formed in an arc shape corresponding to the tunnel cross section, are connected by four gripper jacks 8, and the expansion and contraction of these gripper jacks 8 cause the gripper shoes 8 to expand and contract as shown in FIGS. 1 and 2. Goes in and out of the outer circumference of the gripper frame 5.

In this embodiment, grooves 12 reaching the outer circumference of the grounding surfaces of the gripper shoes 6 and 7 are provided so as to intersect with each other vertically and horizontally.
The ground plane is subdivided. Due to the groove 12, when the gripper shoes 6 and 7 are pressed toward the natural ground, it becomes easy to remove the intervening earth and sand between the gripper shoes 6 and 7 and the natural ground. Therefore, it is possible to prevent the gripper device from slipping when a propulsive reaction force is applied, while ensuring a ground contact area that does not damage the ground due to the contact surface pressure.

FIG. 6 and FIG. 7 show a second embodiment of the present invention corresponding to claim 2.
An example of is shown.

In this embodiment, instead of the groove 12 of the first embodiment, holes 13 (three in the figure) penetrating to the back side of the gripper shoes 6, 7 are provided at appropriate intervals. . This hole
Due to 13, when the gripper shoes 6, 7 are pressed toward the natural ground, the moving distance of the intervening earth and sand between the gripper shoes 6, 7 and the natural earth becomes short, and the intervening earth and sand are easily removed. Therefore, with this configuration, the same effect as that of the first embodiment can be obtained.

Although the separate embodiment of the gripper device is shown as the above embodiment, the present invention can be similarly applied to the gripper device incorporated in the excavator body.

[Effect of device]

According to the present invention, since the intervening earth and sand between the gripper shoe and the ground is eliminated, the gripper shoe is directly contacted and fixed with the ground, so that the gripper device is prevented from slipping during the excavation of the excavator. can do.

[Brief description of drawings]

1 to 5 are views showing a first embodiment of the present invention, wherein FIG. 1 is a side sectional view of the entire gripper device, FIG. 2 is a side sectional view with the gripper jack extended, and FIG. 3 is a sectional view taken along the line AA of FIG. 2, FIG. 4 is a sectional view taken along the arrow B of FIG. 3, FIG. 5 is a sectional view taken along the line CC of FIG. 4, FIG. 6 and FIG. Second
6 is a plan view corresponding to FIG. 4, FIG. 7 is a sectional view taken along the line DD of FIG. 6, FIG. 8 and FIG. 9 are operation explanatory views of the gripper device. FIG. 10 is a sectional view taken along the line EE in FIG. 1 ... Excavator body, 4 ... Gripper device, 5 ... Gripper frame, 6, 7 ... Gripper shoe, 8 ... Gripper jack, 1
2… Solid removal groove, 13… Sand removal hole.

Claims (2)

[Scope of utility model registration request] 1. A tunnel excavator equipped with a plurality of arc-shaped gripper shoes and a gripper jack for pressing the gripper shoes from the inside of the tunnel toward the natural ground in order to take a reaction force of the tunnel excavator. The gripper device for a tunnel excavator, wherein the gripper device has a grounding surface provided with a groove for removing the sand reaching the outer periphery thereof. 2. A gripper device for a tunnel excavator, characterized in that, instead of the groove of claim 1, a hole for earth and sand penetrating to the rear side is provided in the grounding surface of the gripper shoe.