JPH07305595A - Blocking structure for joint recessed section in concrete segment - Google Patents

Abstract

PURPOSE:To make joint recessed sections easily blocked by filling mortar into the joint recessed sections out of the injection port of a blocking cover in the state that the blocking cover is detachably mounted on the opening of the joint recessed sections with the cover rotated by 90 deg.. CONSTITUTION:A blocking cover 31 is in a disc shape corresponding to an oblong shape starting from the inner corner periphery 27 of each release section 26 down to the outer corner periphery 18 of each engaging section 16, and both its end peripheries are provided with each tapered surface 32a corresponding to the cut-out of each engaging section 16 in angle. The blocking cover 31 is mounted on segments 1 with the joint recessed sections 8 blocked by letting the back side of each tapered surface 32 abut against both abutting surfaces 24 of each release section 26 at both ends of the blocking cover, and rotating the cover by 90 deg. around a mortar injection hole 33. In this mounting state, each tapered surface 32 is closely adhered to oblique surfaces 15, each back surface is closely adhered to abutting surfaces 14, and its surface is flush with the inner surface 3 of the segments 1. Later on, mortar is then filled in the joint recessed sections 8 out of a mortar injection port 33. Since the blocking cover 31 is engaged therewith in a state that no falling is permitted, there is no fear of falling of the part of mortar M.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete segment in which a large number 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 smooth. Regarding

[0002]

2. Description of the Related Art A so-called shield construction method for constructing a tunnel is generally constructed by assembling a cylindrical wall body by installing a large number of arc-shaped segments on a peripheral wall having a substantially circular cross section obtained by excavating the ground with a shield machine. This is a construction method in which this is used as a primary lining, and the inner surface of the lining is then subjected to secondary winding with concrete or the like for secondary lining.

FIG. 9 shows an example of a conventional RC (reinforced concrete) segment 1. This segment 1 is formed by reinforced concrete into an arc plate shape and is curved. Direction) and lengthwise direction (circumferential direction) of each joint end surface 5, and the inner surface 3
A plurality of joint recesses 8 are formed in a portion near the joint end surface 5 on the side, and a bolt insertion hole 6 is formed through a flange portion (joint member) 7 in a portion extending from the joint recess 8 to the joint end surface 5. Then, as shown in FIG. 10, bolts 9 are inserted from the joint recesses 8 of one of the segments 1 into the bolt insertion holes 6 in which the joint end faces 5 are aligned and aligned at the same time, and the nuts 10 are inserted from both joint recesses 8. Is screwed onto the bolt 9 and the flange portions 7 are fastened to connect the segments 1 to each other.

By the way, in the shield construction method, secondary lining is carried out by performing secondary winding with concrete 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 considered. In view of this, it has been desired to obtain the tunnel peripheral wall only by the primary lining without applying the secondary lining.

When only the primary lining is used as described above, in the segment 1 shown in FIGS. 9 and 10, the appearance is improved, the bolts 9, the nuts 10, etc. are rust-proofed, and the strength of the segment 1 itself is improved. For the purpose of improvement, a solidifying material such as mortar is embedded in the joint recess 8 so that its surface is flush with the inner surface 3 of the segment 1. When filling the joint recess 8 with a solidifying material such as mortar, after closing the joint recess 8 with a plate or the like, the solidifying material is injected through a hole formed in the plate and the plate is removed after curing. A method is being considered.

[0006]

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

The present invention has been made in view of the above circumstances, and has a structure for closing a joint recess of a concrete segment which can easily close the joint recess of the concrete segment in a short time without causing the filler to drop. Is intended to provide.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object, and an opening peripheral edge of a joint recess is formed in a substantially rectangular shape, and two pairs of sides of the peripheral edge facing each other are provided. An engaging portion is provided by forming an undercut-shaped notch that spreads toward the bottom side of the joint recess on one side of one of the sets, and a board-shaped closing lid is arranged in the opening. Then, the peripheral portion of the closing lid is engaged with the engaging portion by rotating the closing lid approximately 90 degrees along the inner surface of the segment, and in that state, the surface of the closing lid is substantially flush with the inner surface of the segment. I am trying.

In addition, the closing lid may be provided with an injection port for injecting a solidifying material such as mortar into the joint recess, and injecting and filling the solidifying material into the joint recess through the injection port.

[0010]

According to the present invention, by rotating the closing lid by about 90 degrees, the closing lid can be attached to the opening of the joint recess, and the opening can be closed flush with the inner surface of the segment, thus closing the joint recess. Work can be performed easily and in a short time. Further, since the peripheral portion of the closing lid is engaged with the engaging portion and cannot be dropped, there is no fear that the solidified material such as mortar filled in the joint recess falls. In addition, the filling of the solidifying material into the joint recess may be performed by forming a solidifying material injection port in the closing lid and starting from there.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In the drawings, the same components as those in FIGS. 9 and 10 are designated by the same reference numerals to simplify the description. 1 to 3
As shown in FIG. 5, the joint recess 8 has a peripheral edge formed in a substantially square shape.
B, 12A, and 12B are along the width direction and the length direction of the segment 1, respectively. The four transition parts (corners) from the side part to the side part are formed in a curved surface shape. Two side portions 11A, 1 facing each other along the width direction of the segment 1
Undercut-shaped notches 13 that spread toward the bottom side of the joint recess 8 are formed in 1B. The notch 13 is formed in an arc shape between both ends of the side portions 11A and 11B, and the notch 13 forms an abutting surface 14 parallel to the inner surface 3 and a slope 15 at a predetermined angle. The portions 11A and 11B are provided with a hook-shaped engaging portion 16.

On the other hand, a counterbore-shaped notch 23 that widens toward the opening side of the joint recess 8 is formed in the two side portions 12A and 12B facing each other along the length direction of the segment 1. The notch 23 is formed in an arc shape between both ends of the side portions 12A and 12B, and the notch 23 causes the abutting surface 24 parallel to the inner surface 3 and the slope 2 having a predetermined angle.
5 are formed, and by these, the open portions 26 are provided on the side portions 12A and 12B. The abutting surface 24 is flush with the abutting surface 14 of the engaging portion 16.

Notch 1 of engaging portion 16 and opening portion 26
The arc-shaped inner corner edges 17 and 27 of 3, 23 are continuous as a concentric circle of the diameter R0, and the diameter R0 is set shorter than the diameter R1 of the outer corner edge 28 of the opening 26. Has been done.
Therefore, the outer corner edges 18 and 28, which are the peripheral edges of the engaging portion 16 and the opening portion 26, have a long ellipse shape along the width direction of the segment 1.

FIG. 4 shows a closing lid 31 for closing the joint recess 8, and the closing lid 31 has an inner corner edge 2 of the opening 26.
7 to the outer corner edge 18 of the engaging portion 16 has a disk-like shape corresponding to an oval shape, and both end edges thereof are formed with tapered surfaces 32a having angles corresponding to the notches 13 of the engaging portion 16. The tapered portion 32 is formed. Also, the closing lid 31
A mortar inlet 33 is formed in the center of the. The closing lid 31 is preferably made of a material having high corrosion resistance such as fiber concrete.

As shown in FIGS. 5 and 6, the closing lid 31 has the taper surfaces 32a at both ends as the front side, and the back side of the taper portion 32 is abutted against both abutting surfaces 24 of the open portion 26, respectively, and next. By rotating the mortar inlet 33 by 90 degrees, the joint recess 8 is closed and the joint 1 is attached to the segment 1. That is, when the closing lid 31 is rotated 90 degrees in this way, the tapered portions at both ends slide into the notches 13 of the engaging portion 16 from the inner corner edges of the opening portion 26 and become incapable of falling. Is installed in the joint recess 8.
In this mounted state, as shown in FIGS. 7 and 8, the taper surface 32a of the taper portion 32 is the slope 15 and the back surface is the contact surface 1.
4, and the surface is flush with the inner surface 3 of the segment 1. Further, when the closing lid 31 is rotated by 90 degrees from this attached state, the taper portion 32 moves to the opening portion 26 and can be removed. Note that illustration of bolts and nuts is omitted in FIGS. 7 and 8.

When the closing lid 31 is attached to the joint recess 8 as described above, the mortar (solidifying material) M is filled into the joint recess 8 from the mortar inlet 33. The filling of the mortar M is optional, and when not necessary, the mortar inlet 33 is not formed in the closing lid 31.

According to the structure for closing the joint recess 8 of the present embodiment, the joint recess 8 can be easily attached to the opening of the joint recess 8 by rotating the closing lid 31 by 90 degrees, and the opening of the segment 1 can be fitted. It can be closed flush with the inner surface 3. That is, the joint recess 8
The closing work can be performed easily and in a short time. Further, since the taper portion 32 is engaged with the engaging portion 16 of the segment 1 to prevent the closing lid 31 from falling, there is no possibility that the mortar M filled in the joint recess 8 falls.

[0018]

As described above, according to the joint recess closing structure in the concrete segment of the present invention, the opening peripheral edge of the joint recess is formed in a substantially rectangular shape, and two pairs of sides of the peripheral edge facing each other are formed. An engaging portion is provided by forming an undercut-shaped notch that spreads toward the bottom side of the joint recess on one side of one of the sets, and a board-shaped closing lid is arranged in the opening. Then, the peripheral portion of the closing lid is engaged with the engaging portion by rotating the closing lid approximately 90 degrees along the inner surface of the segment, and in that state, the surface of the closing lid is substantially flush with the inner surface of the segment. The joint recess can be closed easily and in a short time, and since the closing lid does not engage with the segment and cannot be disengaged, the mortar or other solid material filled in the joint recess may fall. It has the effect of not being present.

[Brief description of drawings]

FIG. 1 is a side sectional view of a joint end portion in which a joint recess of a segment to which an embodiment of the present invention is applied is formed.

FIG. 2 is a front sectional view of the same.

FIG. 3 is an inside view of the same.

FIG. 4 is a plan view of the closing lid.

FIG. 5 is an internal view showing a state at the time of setting when closing the joint recess with the closing lid.

FIG. 6 is an inner view showing a state in which the joint recess is closed by a closing lid.

FIG. 7 is a sectional side view of the same.

FIG. 8 is a front sectional view of the same.

FIG. 9 is a perspective view showing a general example of a concrete segment.

FIG. 10 is a side sectional view of a joint portion of the same segment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete segment 3 Inner surface of segment 5 Joint end surface 7 Flange portion (joint member) 8 Joint recess 9 Bolts 11A, 11B Side portion 13 Notch 16 Engagement portion 31 Closing lid 32 Tapered portion 33 Mortar injection port M Mortar

Claims (3)

[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 a bolt that penetrates both joint members from one of the joint recesses formed inside both joint members, each joint recess is formed into a segment in which the joint recess is formed. It is a structure that closes substantially flat along the inner surface, the opening peripheral edge of the joint recess is formed in a substantially rectangular shape, and one side of one of the two sides of the peripheral edge facing each other, An engagement part is provided by forming an undercut notch that widens toward the bottom side of the joint recess, and a disc-shaped closing lid is placed in the opening and then rotated approximately 90 degrees along the inner surface of the segment By doing so, the peripheral portion of the closing lid is engaged with the engaging portion, and the surface of the closing lid is substantially flush with the inner surface of the segment in this state, the closing structure for the joint recess in the concrete segment. 2. The joint members embedded in the joint end faces of the concrete segments to be joined are joined together,
After fastening these joint members with a bolt that penetrates both joint members from one of the joint recesses formed inside both joint members, each joint recess is formed into a segment in which the joint recess is formed. It is a structure that closes substantially flat along the inner surface, the opening peripheral edge of the joint recess is formed in a substantially rectangular shape, and one side of one of the two sides of the peripheral edge facing each other, An engagement part is provided by forming an undercut notch that widens toward the bottom side of the joint recess, and a disc-shaped closing lid is placed in the opening and then rotated approximately 90 degrees along the inner surface of the segment By doing so, the peripheral portion of the closing lid is engaged with the engaging portion, and in this state the surface of the closing lid is substantially flush with the inner surface of the segment, and the joint recess is filled with a solidifying material such as mortar. Joints in concrete segments characterized by Closure structure of the recess. 3. The closing of the joint recess in a concrete segment according to claim 2, wherein the closing lid is formed with an injection port for injecting a solidifying material such as mortar into the joint recess. Construction.