JPH0747510Y2 - Closure structure of bolt connection recess in joint of concrete segment - Google Patents

Description

[Detailed Description of the Invention] "Industrial field of application" The present invention relates to the mutual use of concrete segments, such as concrete segments, which are connected to each other by bolt connections to the inner peripheral surface of a drill hole when a tunnel is constructed by a shield method. The present invention relates to a structure for closing a bolt coupling recess provided near a joint portion.

"Prior art" The shield construction method for constructing tunnels such as railway tunnels is that many arcuate plate-shaped segments are assembled in the circumferential direction on a peripheral wall with a substantially circular cross section, which is excavated by a shield machine, and they are connected to each other. The lining of the peripheral wall is used as a primary lining, and the inner surface of the lining is subjected to secondary winding with concrete to carry out a secondary lining.

The segment may be made of RC (reinforced concrete) or steel, and FIGS. 5 and 6 show general RC segments that have been conventionally used.

This segment 1 is provided with bolt connection recesses at equal intervals on the inner surfaces of the joint portions 2A and 2B in the vicinity of the respective joint end surfaces 1a and 1b along the axial direction and the circumferential direction of the arc plate-shaped segment body 1A. Hereinafter, a plurality of recesses 3 are simply provided, and a bolt insertion hole 4 is formed between the recess 3 and each of the joint end surfaces 1a and 1b. Further, a recess is formed on the extension of the bolt insertion hole 4 in the inward direction. A bolt relief hole 5 that faces 3 is formed.

Then, the joint end faces 1a and 1b are aligned with each other, and at the same time, the bolt insertion holes 4 are aligned with each other to form a round rod-shaped bolt 6
Was inserted into the bolt relief hole 5 from the recess 3 of one segment 1 and then fitted to the bearing plate 7 applied to the inner surface of the recess 3 of both segments 1 on the joint end face 1a (1b) side. The segments 1 are connected to each other by penetrating the bolt insertion holes 4 and then screwing and fastening nuts 8 into the threaded portions at both ends of the bolts 6, respectively.

By the way, the shield construction method was described above in which secondary lining is performed by performing secondary winding with concrete after the primary lining, but recently, the appearance of RC segments with good corrosion resistance,
In view of improvement in economic efficiency, it has been desired to form a lining structure for the tunnel peripheral wall only by the primary lining without applying the secondary lining.

In this way, when only the primary lining is used, as shown in FIGS.
In the segment 1 shown in the figure, the interior of the recess 3 is used for the purpose of utilizing various tunnel internal spaces, preventing rust of the bolt 6, the bearing plate 7 and the nut 8 and further improving the strength of the concrete segment 1 itself. Filling (including the bolt relief hole 5) with a filling material such as mortar and the like are made flush with the inner surface 1B of the segment body 1A. When filling a filling material such as mortar into the recess 3, at present, after filling the recess 3 with a plate or the like, the filler is injected and filled through an injection opening formed in the plate, and the plate is cured. The method of removing is considered.

[Problems to be solved by the device] However, such a method is complicated, and especially when the filling material is filled in the recess 3 located above the horizontal diameter of the tunnel, the worker faces upward. Since this is the posture and the filling material is fluid, it is extremely difficult to do. In addition, there is a concern that the filler may drop from the recess after a long period of time.

[Means for Solving the Problems] The present invention has been made to solve the above problems, in which a base end portion of a support body in which a threaded portion is formed at the tip is bent is formed in a bolt escape hole of a joint portion. , The threaded portion is fitted and fixed in a state of facing the opening direction of the recess for bolt coupling, and a counterbore hole is formed in the opening peripheral edge to the inner surface side of the concrete segment in this recess, and the screw of the support is Has a threaded portion that is screwed into the portion, and in the threaded state, the closing lid is fitted in the counterbore hole in a state where its surface is substantially flush with the inner surface. It is characterized in that it is screwed into and fitted into the counterbore hole.

[Operation] According to the closed structure of the bolt coupling recess in the joint portion of the concrete segment of the present invention, the screw portion of the tip portion of the support body, the base end portion of which is fitted and fixed to the bolt relief hole of the joint portion, is used. The recess is flatly closed along the inner surface of the concrete segment by screwing the threaded portion of the closing lid. Since the closure lid is screwed into the threaded part of the support rod and does not come off, it is possible to easily and quickly close a recess located above the horizontal diameter of the tunnel, and it is also possible to use the conventional filling material. Is not likely to fall from the recess.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. In the figure, the same components as those in FIGS. 5 and 6 are designated by the same reference numerals, and the description thereof will be omitted.

In FIG. 1, reference numeral 10 is a rod 11 bent at an appropriate angle.
Is a support rod (supporting body) in which a threaded portion 11a is formed at the tip of the rod, and a fitting portion 11b fitted into the bolt escape hole 5 is fixed to the base end portion of the rod 11. It is fitted and fixed in the bolt escape hole 5. In this state, the axis of the threaded portion 11a at the tip of the rod 10 coincides with the line 1 in the depth direction passing through the approximate center of the recess 3 and faces the opening direction of the recess 3, and the tip projects from the recess 3. Not not.

On the other hand, a circular counterbore 12 is formed in the recess 3 at the peripheral edge of the opening of the recess 3 toward the inner surface 1B side of the segment body 1A. .

13 is a closing lid. The closing lid 13 has a thickness substantially the same as the depth of the counterbore hole 12, and the peripheral surface thereof is a tapered disc-shaped lid main body that is in close contact with the inner peripheral wall of the counterbore hole 12. 13a and the inner surface 14a which is the surface of the lid body 13a on the small diameter side.
It comprises a screw cylinder (screw portion) 13b which is embedded in the center of the lid coaxially with the lid body 13a and protrudes, and which is screwed into the screw portion 11a at the tip of the support rod 10.

Then, the closing lid 13 attaches the screw cylinder 13b to the support rod 1
When the lid body 13a is screwed into the threaded portion 11a of 0 and the lid body 13a is fitted into the counterbore hole 12, the recess 14 has a surface 14b on the large diameter side of the lid body 13a and the inner surface 1B of the segment body 1A. It is blocked in the state of becoming one.

In addition, the lid body 13a is provided with a filler injection port 15 which communicates with the inside of the recess 3, and the lid 3 closes the recess 3 as described above.
After being closed by 13, a filling material 16 such as mortar is injected and filled from the filling material inlet 15 into the recess 3. A plug 17 is embedded in the filling material injection port 15 so as to be flush with the surface 14b of the lid body 13a.

In order to close the recess 3 as described above, as shown in FIG. 3, after connecting the segments 1 by the bolt 6, the bearing plate 7 and the nut 8, the bolt escape hole 5 and the support rod 10 are connected. The fitting portion 11b is fitted and fixed such that the axial line of the threaded portion 11a at the tip portion is aligned with the line 1 in the depth direction passing through the approximate center of the recess 3 and faces the opening direction of the recess 3. .

Next, using the filler injection port 15, the screw cylinder 13b of the closing lid 13 is screwed into the threaded portion 11a of the support rod 10 with a dedicated tool (not shown), and the lid body 13a of the closing lid 13 is spot-turned. Hole 12
To fit. After that, the filler 16 is injected and filled into the recess 3 from the filler inlet 15, and then the plug 17 is embedded in the filler inlet 15. When the closing lid 12 is screwed into the screw hole 11, mortar or adhesive is applied to the inner peripheral surface of the screw hole 11 as needed. In addition, the filler 16 is preferably fast-curing.

According to the structure for closing the recess 3 of the present embodiment, the support rod 10 is fitted and fixed in the bolt relief hole 5 formed in the joint portion 2A (2B) of the segment 1, and the support rod 10 After the recess 3 is closed by the closing lid 13 that is fixed by being screwed into the threaded portion 11a, the filling material 16 is filled from the filling material inlet 15 of the closing lid 13 into the recess 3. Even if the recess 3 is located above the horizontal diameter of the tunnel, this recess 3 can be easily and quickly
It can be closed to a flat surface along the inner surface 1B of 1A. Moreover, the filling / filling operation of the filling material 16 can be released from the complexity because the closing lid 13 cannot be removed. Further, even after a long period of time, there is no possibility that the filler 16 will be dropped from the recess 3 by being blocked by the closure lid 13 that does not come off.

FIG. 4 shows another embodiment of the present invention.

In this embodiment, the counterbore hole 19 is rectangular, and the closing lid 20 for closing the recess 3 has a disk-shaped inner lid having a screw cylinder (screw portion) 21a screwed into the screw portion 11a of the support rod 10. 21 and
A circular fitting hole 22a into which the inner lid 21 is fitted is formed, and the outer lid 22 has a rectangular outer shape that fits into the counterbore hole 19. And a spot facing hole 19
The outer lid 22 is fitted to the inner lid 21, and the screw cylinder 21a of the inner lid 21 is screwed into the threaded portion 11a of the support rod 10 to form the inner lid 21.
Fits into the fitting hole 22a and holds the outer lid 22, and in this state, the surfaces 21a and 22b of the inner lid 21 and the outer lid 22 are flush with the inner surface 1B of the segment body 1A. That is,
The recess 3 is closed flat by the closing lid 20 along the inner surface 1B of the segment body 1A.

A filler injection port 23 is formed in the outer lid 22,
From here, the filler 16 is injected and filled into the recess 3, and the filler inlet 23 is closed by the plug 24.

[Advantage of the Invention] According to the closure structure of the bolt coupling recess in the joint portion of the concrete segment of the present invention, the screw at the tip end of the support body whose base end is fitted and fixed in the bolt escape hole of the joint When the threaded portion of the closure lid is screwed into the section, the recess is closed flat along the inner surface of the concrete segment.The closure lid is screwed into the threaded portion of the support rod and cannot be removed. Even if the recess is located above the horizontal diameter, the plug can be easily and quickly closed, and the filler is unlikely to drop from the recess as in the conventional case.

[Brief description of drawings]

1 to 3 are views showing an embodiment of the present invention, wherein FIG. 1 is a sectional view thereof, FIG. 2 is a view in the direction of arrow II in FIG. 1, and FIG. 3 is an exploded view. 4 is a sectional view showing another embodiment of the present invention, FIG. 5 is a perspective view of an RC segment, and FIG. 6 is a sectional view of a joint portion. 1 ... Segment, 1B ... Inside of segment, 1a, 1b ...
… Joint end face, 2A, 2B …… Joint part, 3 …… Bolt connecting recess, 4 …… Bolt insertion hole, 5 …… Bolt escape hole, 6 ……
Bolt, 10 ... Support rod (support), 11a ... (Support) screw part, 11b ... Fitting part (base end), 12, 19 ...
Counterbore hole, 13, 20 ... Closure lid, 13b, 21a ... Screw cylinder (thread portion of the closure lid), 14b, 21a, 22b ... Surface of the closure lid.

Claims (1)

[Scope of utility model registration request] 1. A bolt insertion hole is formed between a joint end surface of a segment main body and a bolt coupling recess provided in the vicinity of the joint end surface, and a bolt is once provided on an extension of the bolt insertion hole in an inward direction. In the joint portion of the concrete segment in which a bolt escape hole facing the recess where the bolt can be inserted into the bolt insertion hole is formed, the recess for bolt coupling is substantially flat along the inner surface of the segment body. A structure in which the base portion of a support body having a threaded portion formed at the tip is bent and fitted into the bolt escape hole in a state where the threaded portion faces the opening direction of the recess. Then, forming a counterbore hole in the opening peripheral edge to the inner surface side of the concrete segment in this recess, having a screw portion screwed to the screw portion of the support body in the counterbore hole in the screwed state It is characterized in that a closing lid that fits in a state where its surface is substantially flush with the inner surface is formed by fitting the threaded portion into the threaded portion of the support body and fitting it into the counterbore hole. Closure structure of bolt connection recess in joint of concrete segment.