JP3345171B2 - Closed structure of joint recess in concrete segment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure in which a plurality of joints are connected to form a tunnel wall, and a joint recess for bolt connection formed on the inner surface of the joint is closed to finish the inner surface of the tunnel smoothly. About.

[0002]

2. Description of the Related Art In general, a so-called shield construction method for constructing a tunnel is generally performed by assembling a cylindrical wall body by mounting a number of arc-shaped segments on a peripheral wall having a substantially circular cross section obtained by excavating the ground by a shield machine. This is a method in which this is used as a primary lining, and a secondary lining or the like is performed on the inner surface of the primary lining to perform secondary lining.

FIG. 5 shows an example of a conventional RC (reinforced concrete) segment 1. The segment 1 is formed into an arc-shaped plate by reinforced concrete, and has a curved segment body 4 having an outer surface 2 and an inner surface 3 which are curved.
A plate-shaped joint fitting (joint member) 7 having a bolt insertion hole 6 at the center is embedded on the inner surface 3 side of each joint end face 5 along the width direction (axial direction) and the length direction (circumferential direction). A joint recess 8 for bolt connection is formed in the segment body 4 at a portion inside the joint fitting 7. Then, as shown in FIG. 6, the bolts 9 are passed through the joint recesses 8 of one segment 1 into the bolt insertion holes 6 which are joined together at the same time as the joining end faces 5, and the nut 10 is inserted through the other joint recess 8. Is screwed to the bolt 9 and the joint fittings 7 are fastened to connect the segments 1 to each other.

[0004] By the way, in the shield method, secondary lining is performed by performing secondary winding with concrete or the like after the primary lining. In recent years, however, the appearance of concrete segments having good corrosion resistance and the improvement of economic efficiency have been improved. In view of this, it has been desired to obtain the tunnel peripheral wall only with the primary lining without performing the secondary lining.

[0005] When only the primary lining is used as described above, in the segment 1 shown in FIGS. 5 and 6, the appearance is improved, the rust prevention of the joint fitting 7, the bolt 9, the nut 10, etc., and the segment 1 is further improved. Filler such as mortar is buried in the joint recess 8 for the purpose of improving the strength of the joint 1 itself, and the surface thereof is made flush with the inner surface 3 of the segment body 4. When filling the joint recess 8 with a filler such as mortar, a method is considered in which after filling the joint recess 8 with a plate or the like, a filler is injected from a hole formed in the plate, and the plate is removed after curing. Have been.

[0006]

The joint recess 8 is formed by the above method.
It is easily assumed that the method of closing the flat surface is complicated and time-consuming, and there is a concern that the cured filler may fall from the joint recess 8.

The present invention has been made in view of the above circumstances, and has a structure in which a joint recess in a concrete segment can be closed easily and in a short time and a filler does not drop in a concrete segment. It is intended to provide.

[0008]

DISCLOSURE OF THE INVENTION The present invention has been made to achieve the above object, and a plate-like closing lid having elasticity is elastically deformed and put into a joint recess and then elastically restored. The opening of the joint recess was closed almost flush with the segment with the closing lid by engaging with the engaging portion formed at the opening edge of the joint recess to make it impossible to fall off. It is characterized in that a filler such as mortar is filled into the joint recess from the filler inlet.

[0009]

According to the present invention, the joint recess is closed almost flush with the cover only by elastically deforming the cover and placing it in the joint recess and then restoring elastically. The closing lid is engaged with the opening edge of the joint recess and cannot be dropped off, so that there is no danger that the filler filled in the joint recess will fall.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In these drawings, the same components as those in FIGS. 5 and 6 are denoted by the same reference numerals, and the description will be simplified. In these figures, illustration of bolts and nuts is omitted. In this case, at the opening edges on both sides of the joint recess 8 in the segment main body 4, a tapered notch 11 narrowing in the opening direction is formed, and the notch 11 forms an engaging portion 12 having a triangular cross section. I have.

Reference numeral 20 denotes a plate-shaped closing lid. The closing lid 20 is formed in a rectangular shape corresponding to the opening of the joint recess 8 and tightly closing the opening. It is made of a material such as rubber having a certain degree of rigidity. The edge along the length direction of the closing lid 20 is cut obliquely to form a tapered surface 21 that fits the notch 11. An injection port 22 is formed through the center of the closing lid 20.

Then, the closing lid 20 engages with the engaging portion 12 by the tapered surface 21 being fitted into the notch 11,
In this state, the surface thereof is flush with the inner surface 3 of the segment 1, and the opening of the joint recess 8 is closed. After the joint recess 8 is closed in this way, the joint recess 8 is filled with the foam mortar M from the inlet 22.

In order to close the joint recess 8 with the closing lid 20 as described above, as shown in FIGS. (Corresponding to the length direction and width direction) corresponding to the opening of
2 is pushed into the joint recess 8 while being bent, and then the closing lid 20 is pulled toward the opening side by using the inlet 22. Then, both sides of the closing lid 20 where the tapered surface 21 is formed engage with the engaging portion 12 so that the closing lid 20 cannot be dropped off and closes the opening. Then, the joint recess 8 is filled with the foam mortar M from the inlet 22.

When it is not necessary to fill the joint recess 8 with the mortar M, the injection port 22 is not formed in the closing lid 20.

According to the structure for closing the joint recess 8 of this embodiment, the joint recess 8 is closed by the closing lid 20 and at the same time, the joint recess 8 is filled with the foamed mortar M at the same time. The location 8 can be closed flush with the inner surface 3 of the segment 1. That is, the work of closing the joint recess 8 can be performed easily and in a short time. In order to attach the closing lid 20 to the opening of the joint recess 8 so that it cannot fall off, simply close the closing lid 2 in the joint recess 8.
It is very simple because it only needs to push 0.
Since the closing lid 20 is engaged with the joint recess 8 in this manner, there is no possibility that the mortar M falls from the joint recess 8.

[0016]

As described above, according to the structure for closing a joint recess in a concrete segment according to the present invention, a plate-like closing lid having elasticity is elastically deformed and put into the joint recess, and then elastically restored. The opening of the joint recess is closed with the closing lid by engaging with the engaging portion formed at the opening edge of the joint recess to make it impossible to fall off, and in addition to this, the fitting is inserted from the filler inlet formed on the closing lid. Since the recess is filled with a filler such as mortar, the joint recess can be closed almost and flush with the inner surface of the segment easily and in a short time. This has the effect that there is no risk of falling from the place.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing the structure of an embodiment of the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is an inside view of a joint recess.

4A and 4B are front sectional views showing a mounting process of the closing lid according to the embodiment, wherein FIG. 4A is a first stage, FIG.
(C) is a mounted state.

FIG. 5 is a perspective view showing a general example of a concrete segment.

FIG. 6 is a side sectional view of a joint portion of the segment.

[Explanation of symbols]

1 ... concrete segment, 3 ... segment inner surface, 4
... Segment body, 5 ... Joint end face, 7 ... Joint fitting (joint member), 8 ... Joint recess, 9 ... Bolt, 12 ... Engagement part, 2
0: closure lid, 21: tapered surface, 22: inlet, M: foam mortar (filler).

Claims (2)

(57) [Claims] 1. A joint member embedded in a joint end face of a concrete segment to be joined is joined together,
After fastening these joint members with bolts penetrating from both of the joint recesses formed on the inside of both joint members to each joint member, each joint recess is replaced with a segment in which the joint recess is formed. It is a structure that closes substantially flat along the inner surface, and after elastically deforming a plate-like closing lid having elasticity and putting it into the joint recess, it is elastically restored and formed at the opening edge of the joint recess. A structure for closing a joint recess in a concrete segment, wherein an opening of the joint recess is closed almost flush with a closing lid by engaging with a joint portion so as not to fall off. 2. The joint recess in the concrete segment according to claim 1, wherein a filler inlet is formed in the closing lid, and a filler such as mortar is filled from the inlet into the joint recess. Closed structure of the place.