JP3849728B2 - Box fixing device for box holes for segment connection bolts - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for fixing a lid provided in a box hole of a bolt used when fastening between segments in a shield method.
[0002]
[Prior art]
The shield construction method is a construction method in which a shield excavator having a face on the front is propelled into the ground, and a tunnel is constructed while excavating and lining work safely inside the ground while preventing the surrounding ground from collapsing. The tunnel portion is formed by connecting arc-shaped concrete segments to a cylinder and assembled by an automatic segment assembly robot. Further, each segment joint portion is fastened with a bolt by a bolt fastening machine mounted on the segment automatic assembly robot so that the assembled segment does not fall or shift.
[0003]
FIG. 3 is a cross-sectional view of the segment joint portion when the segment 1 is cut along a plane perpendicular to the bolt fastening surface of the segment 1. As shown in this figure, the segment 1 is joined to the segment 1 that has already been set and the segment 1 that is held by the shield machine to be set next. The coupling is performed by a bolt fastening machine, and the bolt 4 is fastened by a nut runner 5 which is attached to the tip of the bolt fastening machine and screwed the nut 7 to the bolt 4. A box hole 3a for inserting the nut runner 5 is formed in one joint portion of the segment 1, and the bolt 4 penetrates into the bolt fastening surface of the box hole 3a when both the segments 1 are assembled. Bolt holes are drilled so that they can. A box hole 3b for storing the bolt 4 is formed in the other joint portion of the segment 1, and the bolt 4 is set in the box hole 3b as shown by a broken line before fastening. A portion through which the nut 7 at the tip penetrates through the bolt hole by the compressed air supplied to 3b projects into the box hole 3a.
[0004]
A lid 8 is provided in the box hole 3b, and a seal 10 is provided between the lid 8 and the box hole top portion 11. By pressing the lid 8 against the box hole 8 by a lid jack 12, the box hole 3b has a pressure-resistant structure. The compressed air is supplied from the compressed air hole 9 provided in the lid 8 so that the tip of the bolt 4 protrudes into the box hole 3a.
[0005]
[Problems to be solved by the invention]
When the box hole 3 b is pressurized with compressed air, a pressure of several tons acts on the lid 8. Although the reaction force is pressed down by the hydraulic jack 12, the pressing force of the lid 8 may not be sufficiently obtained due to limitations such as segment strength. In this case, the lid 8 rises from the segment 1 due to the internal pressure of the box hole 3b, and the sealing performance is lowered. As a result, air leaks and the internal pressure of the box hole 3b necessary to push out the bolt 4 cannot be secured.
[0006]
The present invention has been developed to solve such problems. That is, the object is to provide a lid fixing device for fixing the lid of the box hole separately from the hydraulic jack.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, there is provided a lid fixing device for fixing a lid provided in a box hole for a bolt for fastening a joint portion of a segment forming a tunnel, the box in the vicinity of the lid. groove is provided on the inner bore wall includes a jack lid pressing said lid to cover the hole of the segment, and a drive device into and out of the pawl to be fitted into the groove in the groove on the box bore side of the lid, the The lid jack and the claw of the driving device are configured to disperse and bear the pressure acting on the lid when the inside of the box hole is pressurized .
[0008]
The lid can be fixed to the box hole by inserting the claw using a claw driving device attached to the box hole side of the lid in the groove of the inner wall of the box hole. Thereby, it is possible to prevent the lid from being lifted by the internal pressure of the box hole.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of the present invention will be described with reference to FIG. 1 and FIG.
FIG. 1 shows a segment bolt coupling device and a lid fixing device for a box hole for a segment coupling bolt according to the present invention, and FIG. 2 shows a detailed view of the lid fixing device. The configuration other than the lid fixing device is the same as the device described in FIG. In FIG. 2, a steel plate 15 is attached to the concrete surface on the inner wall of the box hole 3 b near the lid 8, and the steel plate 16 is provided with a groove 16. A claw jack 13 is provided on the box hole 3b side of the lid 8, and the tip of the rod 14 has a wedge shape so that it can be easily fitted and removed from the groove 16 by acting as a claw. Since the lid 8 is partially fixed to the segment 1 in a state where the tip end of the rod 14 is fitted in the groove 16, the internal pressure applied to the lid jack 12 can be shared. The oil passage 17 is cut at the surface where the claw jack 13 and the lid 8 are in contact with each other, and the oil supply passage and the oil discharge passage to the claw jack 13 are formed by joining them together, so that hydraulic piping is reduced. ing.
[0010]
In the above-described embodiment, the groove 16 is provided on one surface of the inner surface of the box hole. However, the cover 8 is further strengthened by providing the claws (tip portions of the rod 14) with the jacks 13 provided on both opposing surfaces. It can be fixed to the segment 1.
[0011]
【The invention's effect】
As described above, according to the lid fixing device of the present invention, the lid is partially fixed by fitting the rod end of the jack fixed to the lid into a groove provided in the inner wall of the box hole in a wedge shape. Therefore, it is possible to disperse and bear the force due to the internal pressure of the box hole together with the jack for pressing the lid. Thereby, the force which presses the lid | cover required in order to seal the internal pressure of a box hole is securable. This lid fixing mechanism can be compactly designed by integrating the claw and the jack. Further, if there is sufficient space in the box hole, it is possible to receive almost a reaction force due to internal pressure by providing a groove on the opposing surface of the inner wall of the box hole and providing a jack having a claw fitted to the groove.
[Brief description of the drawings]
FIG. 1 is a view showing a lid fixing device and a bolt fastening device for a box hole for a segment coupling bolt according to the present invention.
FIG. 2 is a detailed view of the lid fixing device.
FIG. 3 is a view showing a conventional lid fixing device and a bolt fastening device for box holes for segment coupling bolts.
[Explanation of symbols]
1 Segment 3a, 3b Box hole 4 Bolt 5 Nut runner 6 Socket 7 Nut 8 Lid 9 Compressed air hole 10 Seal 11 Box hole top 12 Cover jack 13 Claw jack 14 Rod 15 Steel plate 16 Groove 17 Oil passage

Claims (1)

A lid fixing device for fixing a lid provided in a box hole for a bolt for fastening a joint portion of a segment forming a tunnel,
A groove is provided in the inner wall of the box hole near the lid,
A jacking lid pressing said lid to cover the hole of the segment, and a driving device into and out of the pawl to be fitted into the groove in the groove on the box bore side of the lid, the claw of the drive device and jacking the lid The box fixing device for a box hole for segment coupling bolts, characterized in that the pressure acting on the lid is distributed and borne when the inside of the box hole is pressurized .

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