JP3345168B2 - 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. 9 shows an example of a conventional RC (reinforced concrete) segment 1. The segment 1 is formed into an arcuate plate shape by reinforced concrete and curved to form an outer surface 2, an inner surface 3, and a width direction (axial direction). Direction) and lengthwise direction (circumferential direction).
A plurality of joint recesses 8 are formed in a portion near the joint end surface 5 on the side of the side, and a bolt insertion hole 6 is formed through a flange portion (joint member) 7 extending from the joint recess 8 to the joint end surface 5. Then, as shown in FIG. 10, bolts 9 are passed through the joint recesses 8 of one segment 1 through the bolt insertion holes 6 where the joining end surfaces 5 are aligned with each other and are aligned with each other. Is screwed to the bolt 9 and the flange portions 7 are fastened to each other 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. 9 and 10, the appearance is improved, rust prevention of the bolt 9 and the nut 10, and the strength of the segment 1 itself is performed. For the purpose of improvement, a solidifying material such as mortar is buried in the joint recess 8, and the surface thereof is made flush with the inner surface 3 of the segment 1. When filling the joint recess 8 with a solidifying material such as mortar, the joint concave portion 8 is closed with a plate or the like, and then the solidifying material is injected from a hole formed in the plate, and the plate is removed after hardening. A way is being considered.

[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 furthermore, there is a problem that the hardened consolidated material 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]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object, and an opening periphery of a joint recess is formed in a substantially rectangular shape, and two sets of opposed sides of the periphery are provided. An engagement portion is provided by forming an undercut notch extending toward the bottom side of the joint recess in one set of side portions of the pair of portions, and a disc-shaped closing lid is provided in the opening. Then, by rotating about 90 degrees along the inner surface of the segment, 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

[0009] In addition, the method includes forming an injection port for injecting a mortar or other consolidation material into the joint recess in the closing lid, and injecting and filling the consolidation material into the joint recess from the injection port.

[0010]

According to the present invention, by closing the closure lid by approximately 90 degrees, the closure lid can be mounted on the opening of the joint recess and the opening can be closed flush with the inner surface of the segment. Work can be performed easily and in a short time. Further, since the peripheral portion of the closing lid cannot be dropped because it is engaged with the engaging portion, there is no possibility that the solidified material such as mortar filled in the joint recess will fall. Further, the filling of the joint material into the joint recess may be performed by forming an inlet for the solid material in the closing lid in advance.

[0011]

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 denoted by the same reference numerals, and the description will be simplified. 1 to 3
As shown in the figure, the joint recess 8 has a substantially square peripheral edge, and two sets of opposing sides 11A, 11A of the peripheral edge.
B, 12A and 12B are respectively along the width direction and the length direction of the segment 1. Four transitions (corners) from side to side are formed in a curved surface shape. Two opposing sides 11A, 1 along the width direction of the segment 1
An undercut 13 extending toward the bottom of the joint recess 8 is formed in each of the joint recesses 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 a contact 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 pair of eaves-shaped engaging portions 16.

On the other hand, two opposing sides 12A and 12B along the length direction of the segment 1 are formed with a counterbore-shaped notch 23 extending toward the opening side of the joint recess 8. The notch 23 is formed in an arc shape between both ends of the side portions 12A and 12B. The notch 23 allows the abutment surface 24 parallel to the inner surface 3 and the inclined surface 2 at a predetermined angle.
5 are formed, and thereby, the open portions 26 are provided in the side portions 12A and 12B. The abutment surface 24 is flush with the abutment surface 14 of the engagement portion 16.

Notch 1 of engaging portion 16 and opening portion 26
The arc-shaped inner corners 17 and 27 of 3 and 23 are continuous as a circle having the same diameter and the same diameter R0, and this diameter R0 is set shorter than the diameter R1 of the outer corner edge 28 of the opening 26. Have been.
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 oval shape along the width direction of the segment 1.

FIG. 4 shows a closing lid 31 for closing the joint recess 8.
7 is a disc-like shape having a shape corresponding to an oval extending from the outer corner edge 18 of the engaging portion 16 to a tapered surface 32 a having an angle corresponding to the notch 13 of the engaging portion 16 at both end edges. Thus, the tapered portion 32 is formed. In addition, the closing lid 31
A mortar injection port 33 is formed at the center of the mortar. 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 tapered surfaces 32a at both ends facing up, and the back side of the tapered portion 32 abuts against the two abutting surfaces 24 of the opening 26, respectively. The joint recess 8 is closed by being rotated by 90 degrees about the mortar injection port 33 and attached to the segment 1. That is, when the closing lid 31 is rotated by 90 degrees in this way, the tapered portions at both ends slide into the notch 13 of the engaging portion 16 from the inner corner edge of the opening portion 26 and enter the notch 13 so that the falling portion cannot be dropped. To the joint recess 8.
In this mounting state, as shown in FIGS. 7 and 8, the tapered surface 32a of the tapered portion 32 is on the inclined surface 15, and the back surface is on the contact surface 1
4 and the surface is flush with the inner surface 3 of the segment 1. When the closing lid 31 is rotated 90 degrees from this mounted state, the tapered portion 32 moves to the open portion 26 and can be removed. 7 and 8, illustration of bolts and nuts is omitted.

When the closing lid 31 is attached to the joint recess 8 as described above, the mortar (consolidating material) M is filled into the joint recess 8 from the mortar inlet 33. The filling of the mortar M is as required, and if 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 mounted in the opening of the joint recess 8 by rotating the closing lid 31 by 90 degrees, and the opening is formed in the segment 1. It can be closed flush with the inner surface 3. That is, the joint recess 8
Can be performed easily and in a short time. In addition, since the tapered portion 32 of the closing lid 31 cannot be dropped because the tapered portion 32 is engaged with the engaging portion 16 of the segment 1, there is no possibility that the mortar M filled in the joint recess 8 falls.

[0018]

As described above, according to the closed structure of the joint recess in the concrete segment of the present invention, the periphery of the opening of the joint recess is formed in a substantially rectangular shape, and two sets of opposing sides of the periphery are formed. An engagement portion is provided by forming an undercut notch extending toward the bottom side of the joint recess in one set of side portions of the pair of portions, and a disc-shaped closing lid is provided in the opening. Then, by rotating about 90 degrees along the inner surface of the segment, 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. Since the work for closing the joint recess can be easily and quickly completed, and since the closing lid does not come off due to engagement with the segment, there is a possibility that a solidified material such as mortar filled in the joint recess may fall. There is an effect that there is no.

[Brief description of the drawings]

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

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

FIG. 3 is an inner view of the same.

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

FIG. 5 is an inner view showing a state at the time of setting when the joint recess is closed by the closing lid.

FIG. 6 is an inner view showing a state where 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 segment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete segment 3 Segment inner surface 5 Joining end face 7 Flange part (joint member) 8 Joint recess 9 Bolt 11A, 11B side part 13 Notch 16 Engagement part 31 Closure lid 32 Taper part 33 Mortar injection port M Mortar

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) E21D 11/04 E21D 11/08

Claims (3)

(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 is substantially flatly closed along the inner surface, and the periphery of the opening of the joint recess is formed in a substantially rectangular shape, and one of two opposite sides of the periphery has one side, An engagement portion is provided by forming an undercut notch extending toward the bottom side of the joint recess, and a disc-shaped closing lid is arranged at the opening, and then rotated approximately 90 degrees along the inner surface of the segment. The closing structure of the joint recess in the concrete segment is characterized in that 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. 2. A joint member embedded in a joint end face of a concrete segment to be joined is combined with each other,
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 is substantially flatly closed along the inner surface, and the periphery of the opening of the joint recess is formed in a substantially rectangular shape, and one of two opposite sides of the periphery has one side, An engagement portion is provided by forming an undercut notch extending toward the bottom side of the joint recess, and a disc-shaped closing lid is arranged at 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 the concrete segment Closure structure of the recess. 3. The joint closure in a concrete segment according to claim 2, wherein an inlet for injecting a mortar or other solidifying material into the joint recess is formed in the closure lid. Construction.